Commit | Line | Data |
---|---|---|
ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/inode.c |
ac27a0ec DK |
3 | * |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/fs/minix/inode.c | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | * | |
ac27a0ec DK |
15 | * 64-bit file support on 64-bit platforms by Jakub Jelinek |
16 | * (jj@sunsite.ms.mff.cuni.cz) | |
17 | * | |
617ba13b | 18 | * Assorted race fixes, rewrite of ext4_get_block() by Al Viro, 2000 |
ac27a0ec DK |
19 | */ |
20 | ||
ac27a0ec DK |
21 | #include <linux/fs.h> |
22 | #include <linux/time.h> | |
dab291af | 23 | #include <linux/jbd2.h> |
ac27a0ec DK |
24 | #include <linux/highuid.h> |
25 | #include <linux/pagemap.h> | |
26 | #include <linux/quotaops.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/buffer_head.h> | |
29 | #include <linux/writeback.h> | |
64769240 | 30 | #include <linux/pagevec.h> |
ac27a0ec | 31 | #include <linux/mpage.h> |
e83c1397 | 32 | #include <linux/namei.h> |
ac27a0ec DK |
33 | #include <linux/uio.h> |
34 | #include <linux/bio.h> | |
4c0425ff | 35 | #include <linux/workqueue.h> |
744692dc | 36 | #include <linux/kernel.h> |
6db26ffc | 37 | #include <linux/printk.h> |
5a0e3ad6 | 38 | #include <linux/slab.h> |
a8901d34 | 39 | #include <linux/ratelimit.h> |
a27bb332 | 40 | #include <linux/aio.h> |
9bffad1e | 41 | |
3dcf5451 | 42 | #include "ext4_jbd2.h" |
ac27a0ec DK |
43 | #include "xattr.h" |
44 | #include "acl.h" | |
9f125d64 | 45 | #include "truncate.h" |
ac27a0ec | 46 | |
9bffad1e TT |
47 | #include <trace/events/ext4.h> |
48 | ||
a1d6cc56 AK |
49 | #define MPAGE_DA_EXTENT_TAIL 0x01 |
50 | ||
814525f4 DW |
51 | static __u32 ext4_inode_csum(struct inode *inode, struct ext4_inode *raw, |
52 | struct ext4_inode_info *ei) | |
53 | { | |
54 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
55 | __u16 csum_lo; | |
56 | __u16 csum_hi = 0; | |
57 | __u32 csum; | |
58 | ||
171a7f21 | 59 | csum_lo = le16_to_cpu(raw->i_checksum_lo); |
814525f4 DW |
60 | raw->i_checksum_lo = 0; |
61 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE && | |
62 | EXT4_FITS_IN_INODE(raw, ei, i_checksum_hi)) { | |
171a7f21 | 63 | csum_hi = le16_to_cpu(raw->i_checksum_hi); |
814525f4 DW |
64 | raw->i_checksum_hi = 0; |
65 | } | |
66 | ||
67 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)raw, | |
68 | EXT4_INODE_SIZE(inode->i_sb)); | |
69 | ||
171a7f21 | 70 | raw->i_checksum_lo = cpu_to_le16(csum_lo); |
814525f4 DW |
71 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE && |
72 | EXT4_FITS_IN_INODE(raw, ei, i_checksum_hi)) | |
171a7f21 | 73 | raw->i_checksum_hi = cpu_to_le16(csum_hi); |
814525f4 DW |
74 | |
75 | return csum; | |
76 | } | |
77 | ||
78 | static int ext4_inode_csum_verify(struct inode *inode, struct ext4_inode *raw, | |
79 | struct ext4_inode_info *ei) | |
80 | { | |
81 | __u32 provided, calculated; | |
82 | ||
83 | if (EXT4_SB(inode->i_sb)->s_es->s_creator_os != | |
84 | cpu_to_le32(EXT4_OS_LINUX) || | |
85 | !EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, | |
86 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) | |
87 | return 1; | |
88 | ||
89 | provided = le16_to_cpu(raw->i_checksum_lo); | |
90 | calculated = ext4_inode_csum(inode, raw, ei); | |
91 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE && | |
92 | EXT4_FITS_IN_INODE(raw, ei, i_checksum_hi)) | |
93 | provided |= ((__u32)le16_to_cpu(raw->i_checksum_hi)) << 16; | |
94 | else | |
95 | calculated &= 0xFFFF; | |
96 | ||
97 | return provided == calculated; | |
98 | } | |
99 | ||
100 | static void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, | |
101 | struct ext4_inode_info *ei) | |
102 | { | |
103 | __u32 csum; | |
104 | ||
105 | if (EXT4_SB(inode->i_sb)->s_es->s_creator_os != | |
106 | cpu_to_le32(EXT4_OS_LINUX) || | |
107 | !EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, | |
108 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) | |
109 | return; | |
110 | ||
111 | csum = ext4_inode_csum(inode, raw, ei); | |
112 | raw->i_checksum_lo = cpu_to_le16(csum & 0xFFFF); | |
113 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE && | |
114 | EXT4_FITS_IN_INODE(raw, ei, i_checksum_hi)) | |
115 | raw->i_checksum_hi = cpu_to_le16(csum >> 16); | |
116 | } | |
117 | ||
678aaf48 JK |
118 | static inline int ext4_begin_ordered_truncate(struct inode *inode, |
119 | loff_t new_size) | |
120 | { | |
7ff9c073 | 121 | trace_ext4_begin_ordered_truncate(inode, new_size); |
8aefcd55 TT |
122 | /* |
123 | * If jinode is zero, then we never opened the file for | |
124 | * writing, so there's no need to call | |
125 | * jbd2_journal_begin_ordered_truncate() since there's no | |
126 | * outstanding writes we need to flush. | |
127 | */ | |
128 | if (!EXT4_I(inode)->jinode) | |
129 | return 0; | |
130 | return jbd2_journal_begin_ordered_truncate(EXT4_JOURNAL(inode), | |
131 | EXT4_I(inode)->jinode, | |
132 | new_size); | |
678aaf48 JK |
133 | } |
134 | ||
d47992f8 LC |
135 | static void ext4_invalidatepage(struct page *page, unsigned int offset, |
136 | unsigned int length); | |
cb20d518 TT |
137 | static int __ext4_journalled_writepage(struct page *page, unsigned int len); |
138 | static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh); | |
fffb2739 JK |
139 | static int ext4_meta_trans_blocks(struct inode *inode, int lblocks, |
140 | int pextents); | |
64769240 | 141 | |
ac27a0ec DK |
142 | /* |
143 | * Test whether an inode is a fast symlink. | |
144 | */ | |
617ba13b | 145 | static int ext4_inode_is_fast_symlink(struct inode *inode) |
ac27a0ec | 146 | { |
617ba13b | 147 | int ea_blocks = EXT4_I(inode)->i_file_acl ? |
ac27a0ec DK |
148 | (inode->i_sb->s_blocksize >> 9) : 0; |
149 | ||
150 | return (S_ISLNK(inode->i_mode) && inode->i_blocks - ea_blocks == 0); | |
151 | } | |
152 | ||
ac27a0ec DK |
153 | /* |
154 | * Restart the transaction associated with *handle. This does a commit, | |
155 | * so before we call here everything must be consistently dirtied against | |
156 | * this transaction. | |
157 | */ | |
fa5d1113 | 158 | int ext4_truncate_restart_trans(handle_t *handle, struct inode *inode, |
487caeef | 159 | int nblocks) |
ac27a0ec | 160 | { |
487caeef JK |
161 | int ret; |
162 | ||
163 | /* | |
e35fd660 | 164 | * Drop i_data_sem to avoid deadlock with ext4_map_blocks. At this |
487caeef JK |
165 | * moment, get_block can be called only for blocks inside i_size since |
166 | * page cache has been already dropped and writes are blocked by | |
167 | * i_mutex. So we can safely drop the i_data_sem here. | |
168 | */ | |
0390131b | 169 | BUG_ON(EXT4_JOURNAL(inode) == NULL); |
ac27a0ec | 170 | jbd_debug(2, "restarting handle %p\n", handle); |
487caeef | 171 | up_write(&EXT4_I(inode)->i_data_sem); |
8e8eaabe | 172 | ret = ext4_journal_restart(handle, nblocks); |
487caeef | 173 | down_write(&EXT4_I(inode)->i_data_sem); |
fa5d1113 | 174 | ext4_discard_preallocations(inode); |
487caeef JK |
175 | |
176 | return ret; | |
ac27a0ec DK |
177 | } |
178 | ||
179 | /* | |
180 | * Called at the last iput() if i_nlink is zero. | |
181 | */ | |
0930fcc1 | 182 | void ext4_evict_inode(struct inode *inode) |
ac27a0ec DK |
183 | { |
184 | handle_t *handle; | |
bc965ab3 | 185 | int err; |
ac27a0ec | 186 | |
7ff9c073 | 187 | trace_ext4_evict_inode(inode); |
2581fdc8 | 188 | |
0930fcc1 | 189 | if (inode->i_nlink) { |
2d859db3 JK |
190 | /* |
191 | * When journalling data dirty buffers are tracked only in the | |
192 | * journal. So although mm thinks everything is clean and | |
193 | * ready for reaping the inode might still have some pages to | |
194 | * write in the running transaction or waiting to be | |
195 | * checkpointed. Thus calling jbd2_journal_invalidatepage() | |
196 | * (via truncate_inode_pages()) to discard these buffers can | |
197 | * cause data loss. Also even if we did not discard these | |
198 | * buffers, we would have no way to find them after the inode | |
199 | * is reaped and thus user could see stale data if he tries to | |
200 | * read them before the transaction is checkpointed. So be | |
201 | * careful and force everything to disk here... We use | |
202 | * ei->i_datasync_tid to store the newest transaction | |
203 | * containing inode's data. | |
204 | * | |
205 | * Note that directories do not have this problem because they | |
206 | * don't use page cache. | |
207 | */ | |
208 | if (ext4_should_journal_data(inode) && | |
2b405bfa TT |
209 | (S_ISLNK(inode->i_mode) || S_ISREG(inode->i_mode)) && |
210 | inode->i_ino != EXT4_JOURNAL_INO) { | |
2d859db3 JK |
211 | journal_t *journal = EXT4_SB(inode->i_sb)->s_journal; |
212 | tid_t commit_tid = EXT4_I(inode)->i_datasync_tid; | |
213 | ||
d76a3a77 | 214 | jbd2_complete_transaction(journal, commit_tid); |
2d859db3 JK |
215 | filemap_write_and_wait(&inode->i_data); |
216 | } | |
0930fcc1 | 217 | truncate_inode_pages(&inode->i_data, 0); |
5dc23bdd JK |
218 | |
219 | WARN_ON(atomic_read(&EXT4_I(inode)->i_ioend_count)); | |
0930fcc1 AV |
220 | goto no_delete; |
221 | } | |
222 | ||
907f4554 | 223 | if (!is_bad_inode(inode)) |
871a2931 | 224 | dquot_initialize(inode); |
907f4554 | 225 | |
678aaf48 JK |
226 | if (ext4_should_order_data(inode)) |
227 | ext4_begin_ordered_truncate(inode, 0); | |
ac27a0ec DK |
228 | truncate_inode_pages(&inode->i_data, 0); |
229 | ||
5dc23bdd | 230 | WARN_ON(atomic_read(&EXT4_I(inode)->i_ioend_count)); |
ac27a0ec DK |
231 | if (is_bad_inode(inode)) |
232 | goto no_delete; | |
233 | ||
8e8ad8a5 JK |
234 | /* |
235 | * Protect us against freezing - iput() caller didn't have to have any | |
236 | * protection against it | |
237 | */ | |
238 | sb_start_intwrite(inode->i_sb); | |
9924a92a TT |
239 | handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, |
240 | ext4_blocks_for_truncate(inode)+3); | |
ac27a0ec | 241 | if (IS_ERR(handle)) { |
bc965ab3 | 242 | ext4_std_error(inode->i_sb, PTR_ERR(handle)); |
ac27a0ec DK |
243 | /* |
244 | * If we're going to skip the normal cleanup, we still need to | |
245 | * make sure that the in-core orphan linked list is properly | |
246 | * cleaned up. | |
247 | */ | |
617ba13b | 248 | ext4_orphan_del(NULL, inode); |
8e8ad8a5 | 249 | sb_end_intwrite(inode->i_sb); |
ac27a0ec DK |
250 | goto no_delete; |
251 | } | |
252 | ||
253 | if (IS_SYNC(inode)) | |
0390131b | 254 | ext4_handle_sync(handle); |
ac27a0ec | 255 | inode->i_size = 0; |
bc965ab3 TT |
256 | err = ext4_mark_inode_dirty(handle, inode); |
257 | if (err) { | |
12062ddd | 258 | ext4_warning(inode->i_sb, |
bc965ab3 TT |
259 | "couldn't mark inode dirty (err %d)", err); |
260 | goto stop_handle; | |
261 | } | |
ac27a0ec | 262 | if (inode->i_blocks) |
617ba13b | 263 | ext4_truncate(inode); |
bc965ab3 TT |
264 | |
265 | /* | |
266 | * ext4_ext_truncate() doesn't reserve any slop when it | |
267 | * restarts journal transactions; therefore there may not be | |
268 | * enough credits left in the handle to remove the inode from | |
269 | * the orphan list and set the dtime field. | |
270 | */ | |
0390131b | 271 | if (!ext4_handle_has_enough_credits(handle, 3)) { |
bc965ab3 TT |
272 | err = ext4_journal_extend(handle, 3); |
273 | if (err > 0) | |
274 | err = ext4_journal_restart(handle, 3); | |
275 | if (err != 0) { | |
12062ddd | 276 | ext4_warning(inode->i_sb, |
bc965ab3 TT |
277 | "couldn't extend journal (err %d)", err); |
278 | stop_handle: | |
279 | ext4_journal_stop(handle); | |
45388219 | 280 | ext4_orphan_del(NULL, inode); |
8e8ad8a5 | 281 | sb_end_intwrite(inode->i_sb); |
bc965ab3 TT |
282 | goto no_delete; |
283 | } | |
284 | } | |
285 | ||
ac27a0ec | 286 | /* |
617ba13b | 287 | * Kill off the orphan record which ext4_truncate created. |
ac27a0ec | 288 | * AKPM: I think this can be inside the above `if'. |
617ba13b | 289 | * Note that ext4_orphan_del() has to be able to cope with the |
ac27a0ec | 290 | * deletion of a non-existent orphan - this is because we don't |
617ba13b | 291 | * know if ext4_truncate() actually created an orphan record. |
ac27a0ec DK |
292 | * (Well, we could do this if we need to, but heck - it works) |
293 | */ | |
617ba13b MC |
294 | ext4_orphan_del(handle, inode); |
295 | EXT4_I(inode)->i_dtime = get_seconds(); | |
ac27a0ec DK |
296 | |
297 | /* | |
298 | * One subtle ordering requirement: if anything has gone wrong | |
299 | * (transaction abort, IO errors, whatever), then we can still | |
300 | * do these next steps (the fs will already have been marked as | |
301 | * having errors), but we can't free the inode if the mark_dirty | |
302 | * fails. | |
303 | */ | |
617ba13b | 304 | if (ext4_mark_inode_dirty(handle, inode)) |
ac27a0ec | 305 | /* If that failed, just do the required in-core inode clear. */ |
0930fcc1 | 306 | ext4_clear_inode(inode); |
ac27a0ec | 307 | else |
617ba13b MC |
308 | ext4_free_inode(handle, inode); |
309 | ext4_journal_stop(handle); | |
8e8ad8a5 | 310 | sb_end_intwrite(inode->i_sb); |
ac27a0ec DK |
311 | return; |
312 | no_delete: | |
0930fcc1 | 313 | ext4_clear_inode(inode); /* We must guarantee clearing of inode... */ |
ac27a0ec DK |
314 | } |
315 | ||
a9e7f447 DM |
316 | #ifdef CONFIG_QUOTA |
317 | qsize_t *ext4_get_reserved_space(struct inode *inode) | |
60e58e0f | 318 | { |
a9e7f447 | 319 | return &EXT4_I(inode)->i_reserved_quota; |
60e58e0f | 320 | } |
a9e7f447 | 321 | #endif |
9d0be502 | 322 | |
12219aea AK |
323 | /* |
324 | * Calculate the number of metadata blocks need to reserve | |
9d0be502 | 325 | * to allocate a block located at @lblock |
12219aea | 326 | */ |
01f49d0b | 327 | static int ext4_calc_metadata_amount(struct inode *inode, ext4_lblk_t lblock) |
12219aea | 328 | { |
12e9b892 | 329 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
9d0be502 | 330 | return ext4_ext_calc_metadata_amount(inode, lblock); |
12219aea | 331 | |
8bb2b247 | 332 | return ext4_ind_calc_metadata_amount(inode, lblock); |
12219aea AK |
333 | } |
334 | ||
0637c6f4 TT |
335 | /* |
336 | * Called with i_data_sem down, which is important since we can call | |
337 | * ext4_discard_preallocations() from here. | |
338 | */ | |
5f634d06 AK |
339 | void ext4_da_update_reserve_space(struct inode *inode, |
340 | int used, int quota_claim) | |
12219aea AK |
341 | { |
342 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
0637c6f4 | 343 | struct ext4_inode_info *ei = EXT4_I(inode); |
0637c6f4 TT |
344 | |
345 | spin_lock(&ei->i_block_reservation_lock); | |
d8990240 | 346 | trace_ext4_da_update_reserve_space(inode, used, quota_claim); |
0637c6f4 | 347 | if (unlikely(used > ei->i_reserved_data_blocks)) { |
8de5c325 | 348 | ext4_warning(inode->i_sb, "%s: ino %lu, used %d " |
1084f252 | 349 | "with only %d reserved data blocks", |
0637c6f4 TT |
350 | __func__, inode->i_ino, used, |
351 | ei->i_reserved_data_blocks); | |
352 | WARN_ON(1); | |
353 | used = ei->i_reserved_data_blocks; | |
354 | } | |
12219aea | 355 | |
97795d2a | 356 | if (unlikely(ei->i_allocated_meta_blocks > ei->i_reserved_meta_blocks)) { |
01a523eb TT |
357 | ext4_warning(inode->i_sb, "ino %lu, allocated %d " |
358 | "with only %d reserved metadata blocks " | |
359 | "(releasing %d blocks with reserved %d data blocks)", | |
360 | inode->i_ino, ei->i_allocated_meta_blocks, | |
361 | ei->i_reserved_meta_blocks, used, | |
362 | ei->i_reserved_data_blocks); | |
97795d2a BF |
363 | WARN_ON(1); |
364 | ei->i_allocated_meta_blocks = ei->i_reserved_meta_blocks; | |
365 | } | |
366 | ||
0637c6f4 TT |
367 | /* Update per-inode reservations */ |
368 | ei->i_reserved_data_blocks -= used; | |
0637c6f4 | 369 | ei->i_reserved_meta_blocks -= ei->i_allocated_meta_blocks; |
57042651 | 370 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, |
72b8ab9d | 371 | used + ei->i_allocated_meta_blocks); |
0637c6f4 | 372 | ei->i_allocated_meta_blocks = 0; |
6bc6e63f | 373 | |
0637c6f4 TT |
374 | if (ei->i_reserved_data_blocks == 0) { |
375 | /* | |
376 | * We can release all of the reserved metadata blocks | |
377 | * only when we have written all of the delayed | |
378 | * allocation blocks. | |
379 | */ | |
57042651 | 380 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, |
72b8ab9d | 381 | ei->i_reserved_meta_blocks); |
ee5f4d9c | 382 | ei->i_reserved_meta_blocks = 0; |
9d0be502 | 383 | ei->i_da_metadata_calc_len = 0; |
6bc6e63f | 384 | } |
12219aea | 385 | spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); |
60e58e0f | 386 | |
72b8ab9d ES |
387 | /* Update quota subsystem for data blocks */ |
388 | if (quota_claim) | |
7b415bf6 | 389 | dquot_claim_block(inode, EXT4_C2B(sbi, used)); |
72b8ab9d | 390 | else { |
5f634d06 AK |
391 | /* |
392 | * We did fallocate with an offset that is already delayed | |
393 | * allocated. So on delayed allocated writeback we should | |
72b8ab9d | 394 | * not re-claim the quota for fallocated blocks. |
5f634d06 | 395 | */ |
7b415bf6 | 396 | dquot_release_reservation_block(inode, EXT4_C2B(sbi, used)); |
5f634d06 | 397 | } |
d6014301 AK |
398 | |
399 | /* | |
400 | * If we have done all the pending block allocations and if | |
401 | * there aren't any writers on the inode, we can discard the | |
402 | * inode's preallocations. | |
403 | */ | |
0637c6f4 TT |
404 | if ((ei->i_reserved_data_blocks == 0) && |
405 | (atomic_read(&inode->i_writecount) == 0)) | |
d6014301 | 406 | ext4_discard_preallocations(inode); |
12219aea AK |
407 | } |
408 | ||
e29136f8 | 409 | static int __check_block_validity(struct inode *inode, const char *func, |
c398eda0 TT |
410 | unsigned int line, |
411 | struct ext4_map_blocks *map) | |
6fd058f7 | 412 | { |
24676da4 TT |
413 | if (!ext4_data_block_valid(EXT4_SB(inode->i_sb), map->m_pblk, |
414 | map->m_len)) { | |
c398eda0 TT |
415 | ext4_error_inode(inode, func, line, map->m_pblk, |
416 | "lblock %lu mapped to illegal pblock " | |
417 | "(length %d)", (unsigned long) map->m_lblk, | |
418 | map->m_len); | |
6fd058f7 TT |
419 | return -EIO; |
420 | } | |
421 | return 0; | |
422 | } | |
423 | ||
e29136f8 | 424 | #define check_block_validity(inode, map) \ |
c398eda0 | 425 | __check_block_validity((inode), __func__, __LINE__, (map)) |
e29136f8 | 426 | |
921f266b DM |
427 | #ifdef ES_AGGRESSIVE_TEST |
428 | static void ext4_map_blocks_es_recheck(handle_t *handle, | |
429 | struct inode *inode, | |
430 | struct ext4_map_blocks *es_map, | |
431 | struct ext4_map_blocks *map, | |
432 | int flags) | |
433 | { | |
434 | int retval; | |
435 | ||
436 | map->m_flags = 0; | |
437 | /* | |
438 | * There is a race window that the result is not the same. | |
439 | * e.g. xfstests #223 when dioread_nolock enables. The reason | |
440 | * is that we lookup a block mapping in extent status tree with | |
441 | * out taking i_data_sem. So at the time the unwritten extent | |
442 | * could be converted. | |
443 | */ | |
444 | if (!(flags & EXT4_GET_BLOCKS_NO_LOCK)) | |
445 | down_read((&EXT4_I(inode)->i_data_sem)); | |
446 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { | |
447 | retval = ext4_ext_map_blocks(handle, inode, map, flags & | |
448 | EXT4_GET_BLOCKS_KEEP_SIZE); | |
449 | } else { | |
450 | retval = ext4_ind_map_blocks(handle, inode, map, flags & | |
451 | EXT4_GET_BLOCKS_KEEP_SIZE); | |
452 | } | |
453 | if (!(flags & EXT4_GET_BLOCKS_NO_LOCK)) | |
454 | up_read((&EXT4_I(inode)->i_data_sem)); | |
455 | /* | |
456 | * Clear EXT4_MAP_FROM_CLUSTER and EXT4_MAP_BOUNDARY flag | |
457 | * because it shouldn't be marked in es_map->m_flags. | |
458 | */ | |
459 | map->m_flags &= ~(EXT4_MAP_FROM_CLUSTER | EXT4_MAP_BOUNDARY); | |
460 | ||
461 | /* | |
462 | * We don't check m_len because extent will be collpased in status | |
463 | * tree. So the m_len might not equal. | |
464 | */ | |
465 | if (es_map->m_lblk != map->m_lblk || | |
466 | es_map->m_flags != map->m_flags || | |
467 | es_map->m_pblk != map->m_pblk) { | |
bdafe42a | 468 | printk("ES cache assertion failed for inode: %lu " |
921f266b DM |
469 | "es_cached ex [%d/%d/%llu/%x] != " |
470 | "found ex [%d/%d/%llu/%x] retval %d flags %x\n", | |
471 | inode->i_ino, es_map->m_lblk, es_map->m_len, | |
472 | es_map->m_pblk, es_map->m_flags, map->m_lblk, | |
473 | map->m_len, map->m_pblk, map->m_flags, | |
474 | retval, flags); | |
475 | } | |
476 | } | |
477 | #endif /* ES_AGGRESSIVE_TEST */ | |
478 | ||
f5ab0d1f | 479 | /* |
e35fd660 | 480 | * The ext4_map_blocks() function tries to look up the requested blocks, |
2b2d6d01 | 481 | * and returns if the blocks are already mapped. |
f5ab0d1f | 482 | * |
f5ab0d1f MC |
483 | * Otherwise it takes the write lock of the i_data_sem and allocate blocks |
484 | * and store the allocated blocks in the result buffer head and mark it | |
485 | * mapped. | |
486 | * | |
e35fd660 TT |
487 | * If file type is extents based, it will call ext4_ext_map_blocks(), |
488 | * Otherwise, call with ext4_ind_map_blocks() to handle indirect mapping | |
f5ab0d1f MC |
489 | * based files |
490 | * | |
491 | * On success, it returns the number of blocks being mapped or allocate. | |
492 | * if create==0 and the blocks are pre-allocated and uninitialized block, | |
493 | * the result buffer head is unmapped. If the create ==1, it will make sure | |
494 | * the buffer head is mapped. | |
495 | * | |
496 | * It returns 0 if plain look up failed (blocks have not been allocated), in | |
df3ab170 | 497 | * that case, buffer head is unmapped |
f5ab0d1f MC |
498 | * |
499 | * It returns the error in case of allocation failure. | |
500 | */ | |
e35fd660 TT |
501 | int ext4_map_blocks(handle_t *handle, struct inode *inode, |
502 | struct ext4_map_blocks *map, int flags) | |
0e855ac8 | 503 | { |
d100eef2 | 504 | struct extent_status es; |
0e855ac8 | 505 | int retval; |
921f266b DM |
506 | #ifdef ES_AGGRESSIVE_TEST |
507 | struct ext4_map_blocks orig_map; | |
508 | ||
509 | memcpy(&orig_map, map, sizeof(*map)); | |
510 | #endif | |
f5ab0d1f | 511 | |
e35fd660 TT |
512 | map->m_flags = 0; |
513 | ext_debug("ext4_map_blocks(): inode %lu, flag %d, max_blocks %u," | |
514 | "logical block %lu\n", inode->i_ino, flags, map->m_len, | |
515 | (unsigned long) map->m_lblk); | |
d100eef2 ZL |
516 | |
517 | /* Lookup extent status tree firstly */ | |
518 | if (ext4_es_lookup_extent(inode, map->m_lblk, &es)) { | |
63b99968 | 519 | ext4_es_lru_add(inode); |
d100eef2 ZL |
520 | if (ext4_es_is_written(&es) || ext4_es_is_unwritten(&es)) { |
521 | map->m_pblk = ext4_es_pblock(&es) + | |
522 | map->m_lblk - es.es_lblk; | |
523 | map->m_flags |= ext4_es_is_written(&es) ? | |
524 | EXT4_MAP_MAPPED : EXT4_MAP_UNWRITTEN; | |
525 | retval = es.es_len - (map->m_lblk - es.es_lblk); | |
526 | if (retval > map->m_len) | |
527 | retval = map->m_len; | |
528 | map->m_len = retval; | |
529 | } else if (ext4_es_is_delayed(&es) || ext4_es_is_hole(&es)) { | |
530 | retval = 0; | |
531 | } else { | |
532 | BUG_ON(1); | |
533 | } | |
921f266b DM |
534 | #ifdef ES_AGGRESSIVE_TEST |
535 | ext4_map_blocks_es_recheck(handle, inode, map, | |
536 | &orig_map, flags); | |
537 | #endif | |
d100eef2 ZL |
538 | goto found; |
539 | } | |
540 | ||
4df3d265 | 541 | /* |
b920c755 TT |
542 | * Try to see if we can get the block without requesting a new |
543 | * file system block. | |
4df3d265 | 544 | */ |
729f52c6 ZL |
545 | if (!(flags & EXT4_GET_BLOCKS_NO_LOCK)) |
546 | down_read((&EXT4_I(inode)->i_data_sem)); | |
12e9b892 | 547 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { |
a4e5d88b DM |
548 | retval = ext4_ext_map_blocks(handle, inode, map, flags & |
549 | EXT4_GET_BLOCKS_KEEP_SIZE); | |
0e855ac8 | 550 | } else { |
a4e5d88b DM |
551 | retval = ext4_ind_map_blocks(handle, inode, map, flags & |
552 | EXT4_GET_BLOCKS_KEEP_SIZE); | |
0e855ac8 | 553 | } |
f7fec032 ZL |
554 | if (retval > 0) { |
555 | int ret; | |
3be78c73 | 556 | unsigned int status; |
f7fec032 | 557 | |
44fb851d ZL |
558 | if (unlikely(retval != map->m_len)) { |
559 | ext4_warning(inode->i_sb, | |
560 | "ES len assertion failed for inode " | |
561 | "%lu: retval %d != map->m_len %d", | |
562 | inode->i_ino, retval, map->m_len); | |
563 | WARN_ON(1); | |
921f266b | 564 | } |
921f266b | 565 | |
f7fec032 ZL |
566 | status = map->m_flags & EXT4_MAP_UNWRITTEN ? |
567 | EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN; | |
568 | if (!(flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) && | |
569 | ext4_find_delalloc_range(inode, map->m_lblk, | |
570 | map->m_lblk + map->m_len - 1)) | |
571 | status |= EXTENT_STATUS_DELAYED; | |
572 | ret = ext4_es_insert_extent(inode, map->m_lblk, | |
573 | map->m_len, map->m_pblk, status); | |
574 | if (ret < 0) | |
575 | retval = ret; | |
576 | } | |
729f52c6 ZL |
577 | if (!(flags & EXT4_GET_BLOCKS_NO_LOCK)) |
578 | up_read((&EXT4_I(inode)->i_data_sem)); | |
f5ab0d1f | 579 | |
d100eef2 | 580 | found: |
e35fd660 | 581 | if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) { |
f7fec032 | 582 | int ret = check_block_validity(inode, map); |
6fd058f7 TT |
583 | if (ret != 0) |
584 | return ret; | |
585 | } | |
586 | ||
f5ab0d1f | 587 | /* If it is only a block(s) look up */ |
c2177057 | 588 | if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) |
f5ab0d1f MC |
589 | return retval; |
590 | ||
591 | /* | |
592 | * Returns if the blocks have already allocated | |
593 | * | |
594 | * Note that if blocks have been preallocated | |
df3ab170 | 595 | * ext4_ext_get_block() returns the create = 0 |
f5ab0d1f MC |
596 | * with buffer head unmapped. |
597 | */ | |
e35fd660 | 598 | if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) |
4df3d265 AK |
599 | return retval; |
600 | ||
2a8964d6 | 601 | /* |
a25a4e1a ZL |
602 | * Here we clear m_flags because after allocating an new extent, |
603 | * it will be set again. | |
2a8964d6 | 604 | */ |
a25a4e1a | 605 | map->m_flags &= ~EXT4_MAP_FLAGS; |
2a8964d6 | 606 | |
4df3d265 | 607 | /* |
f5ab0d1f MC |
608 | * New blocks allocate and/or writing to uninitialized extent |
609 | * will possibly result in updating i_data, so we take | |
610 | * the write lock of i_data_sem, and call get_blocks() | |
611 | * with create == 1 flag. | |
4df3d265 AK |
612 | */ |
613 | down_write((&EXT4_I(inode)->i_data_sem)); | |
d2a17637 MC |
614 | |
615 | /* | |
616 | * if the caller is from delayed allocation writeout path | |
617 | * we have already reserved fs blocks for allocation | |
618 | * let the underlying get_block() function know to | |
619 | * avoid double accounting | |
620 | */ | |
c2177057 | 621 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) |
f2321097 | 622 | ext4_set_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED); |
4df3d265 AK |
623 | /* |
624 | * We need to check for EXT4 here because migrate | |
625 | * could have changed the inode type in between | |
626 | */ | |
12e9b892 | 627 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { |
e35fd660 | 628 | retval = ext4_ext_map_blocks(handle, inode, map, flags); |
0e855ac8 | 629 | } else { |
e35fd660 | 630 | retval = ext4_ind_map_blocks(handle, inode, map, flags); |
267e4db9 | 631 | |
e35fd660 | 632 | if (retval > 0 && map->m_flags & EXT4_MAP_NEW) { |
267e4db9 AK |
633 | /* |
634 | * We allocated new blocks which will result in | |
635 | * i_data's format changing. Force the migrate | |
636 | * to fail by clearing migrate flags | |
637 | */ | |
19f5fb7a | 638 | ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE); |
267e4db9 | 639 | } |
d2a17637 | 640 | |
5f634d06 AK |
641 | /* |
642 | * Update reserved blocks/metadata blocks after successful | |
643 | * block allocation which had been deferred till now. We don't | |
644 | * support fallocate for non extent files. So we can update | |
645 | * reserve space here. | |
646 | */ | |
647 | if ((retval > 0) && | |
1296cc85 | 648 | (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)) |
5f634d06 AK |
649 | ext4_da_update_reserve_space(inode, retval, 1); |
650 | } | |
f7fec032 | 651 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) |
f2321097 | 652 | ext4_clear_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED); |
2ac3b6e0 | 653 | |
f7fec032 ZL |
654 | if (retval > 0) { |
655 | int ret; | |
3be78c73 | 656 | unsigned int status; |
f7fec032 | 657 | |
44fb851d ZL |
658 | if (unlikely(retval != map->m_len)) { |
659 | ext4_warning(inode->i_sb, | |
660 | "ES len assertion failed for inode " | |
661 | "%lu: retval %d != map->m_len %d", | |
662 | inode->i_ino, retval, map->m_len); | |
663 | WARN_ON(1); | |
921f266b | 664 | } |
921f266b | 665 | |
adb23551 ZL |
666 | /* |
667 | * If the extent has been zeroed out, we don't need to update | |
668 | * extent status tree. | |
669 | */ | |
670 | if ((flags & EXT4_GET_BLOCKS_PRE_IO) && | |
671 | ext4_es_lookup_extent(inode, map->m_lblk, &es)) { | |
672 | if (ext4_es_is_written(&es)) | |
673 | goto has_zeroout; | |
674 | } | |
f7fec032 ZL |
675 | status = map->m_flags & EXT4_MAP_UNWRITTEN ? |
676 | EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN; | |
677 | if (!(flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) && | |
678 | ext4_find_delalloc_range(inode, map->m_lblk, | |
679 | map->m_lblk + map->m_len - 1)) | |
680 | status |= EXTENT_STATUS_DELAYED; | |
681 | ret = ext4_es_insert_extent(inode, map->m_lblk, map->m_len, | |
682 | map->m_pblk, status); | |
683 | if (ret < 0) | |
684 | retval = ret; | |
5356f261 AK |
685 | } |
686 | ||
adb23551 | 687 | has_zeroout: |
4df3d265 | 688 | up_write((&EXT4_I(inode)->i_data_sem)); |
e35fd660 | 689 | if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) { |
e29136f8 | 690 | int ret = check_block_validity(inode, map); |
6fd058f7 TT |
691 | if (ret != 0) |
692 | return ret; | |
693 | } | |
0e855ac8 AK |
694 | return retval; |
695 | } | |
696 | ||
f3bd1f3f MC |
697 | /* Maximum number of blocks we map for direct IO at once. */ |
698 | #define DIO_MAX_BLOCKS 4096 | |
699 | ||
2ed88685 TT |
700 | static int _ext4_get_block(struct inode *inode, sector_t iblock, |
701 | struct buffer_head *bh, int flags) | |
ac27a0ec | 702 | { |
3e4fdaf8 | 703 | handle_t *handle = ext4_journal_current_handle(); |
2ed88685 | 704 | struct ext4_map_blocks map; |
7fb5409d | 705 | int ret = 0, started = 0; |
f3bd1f3f | 706 | int dio_credits; |
ac27a0ec | 707 | |
46c7f254 TM |
708 | if (ext4_has_inline_data(inode)) |
709 | return -ERANGE; | |
710 | ||
2ed88685 TT |
711 | map.m_lblk = iblock; |
712 | map.m_len = bh->b_size >> inode->i_blkbits; | |
713 | ||
8b0f165f | 714 | if (flags && !(flags & EXT4_GET_BLOCKS_NO_LOCK) && !handle) { |
7fb5409d | 715 | /* Direct IO write... */ |
2ed88685 TT |
716 | if (map.m_len > DIO_MAX_BLOCKS) |
717 | map.m_len = DIO_MAX_BLOCKS; | |
718 | dio_credits = ext4_chunk_trans_blocks(inode, map.m_len); | |
9924a92a TT |
719 | handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS, |
720 | dio_credits); | |
7fb5409d | 721 | if (IS_ERR(handle)) { |
ac27a0ec | 722 | ret = PTR_ERR(handle); |
2ed88685 | 723 | return ret; |
ac27a0ec | 724 | } |
7fb5409d | 725 | started = 1; |
ac27a0ec DK |
726 | } |
727 | ||
2ed88685 | 728 | ret = ext4_map_blocks(handle, inode, &map, flags); |
7fb5409d | 729 | if (ret > 0) { |
7b7a8665 CH |
730 | ext4_io_end_t *io_end = ext4_inode_aio(inode); |
731 | ||
2ed88685 TT |
732 | map_bh(bh, inode->i_sb, map.m_pblk); |
733 | bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags; | |
7b7a8665 CH |
734 | if (io_end && io_end->flag & EXT4_IO_END_UNWRITTEN) |
735 | set_buffer_defer_completion(bh); | |
2ed88685 | 736 | bh->b_size = inode->i_sb->s_blocksize * map.m_len; |
7fb5409d | 737 | ret = 0; |
ac27a0ec | 738 | } |
7fb5409d JK |
739 | if (started) |
740 | ext4_journal_stop(handle); | |
ac27a0ec DK |
741 | return ret; |
742 | } | |
743 | ||
2ed88685 TT |
744 | int ext4_get_block(struct inode *inode, sector_t iblock, |
745 | struct buffer_head *bh, int create) | |
746 | { | |
747 | return _ext4_get_block(inode, iblock, bh, | |
748 | create ? EXT4_GET_BLOCKS_CREATE : 0); | |
749 | } | |
750 | ||
ac27a0ec DK |
751 | /* |
752 | * `handle' can be NULL if create is zero | |
753 | */ | |
617ba13b | 754 | struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode, |
725d26d3 | 755 | ext4_lblk_t block, int create, int *errp) |
ac27a0ec | 756 | { |
2ed88685 TT |
757 | struct ext4_map_blocks map; |
758 | struct buffer_head *bh; | |
ac27a0ec DK |
759 | int fatal = 0, err; |
760 | ||
761 | J_ASSERT(handle != NULL || create == 0); | |
762 | ||
2ed88685 TT |
763 | map.m_lblk = block; |
764 | map.m_len = 1; | |
765 | err = ext4_map_blocks(handle, inode, &map, | |
766 | create ? EXT4_GET_BLOCKS_CREATE : 0); | |
ac27a0ec | 767 | |
90b0a973 CM |
768 | /* ensure we send some value back into *errp */ |
769 | *errp = 0; | |
770 | ||
0f70b406 TT |
771 | if (create && err == 0) |
772 | err = -ENOSPC; /* should never happen */ | |
2ed88685 TT |
773 | if (err < 0) |
774 | *errp = err; | |
775 | if (err <= 0) | |
776 | return NULL; | |
2ed88685 TT |
777 | |
778 | bh = sb_getblk(inode->i_sb, map.m_pblk); | |
aebf0243 | 779 | if (unlikely(!bh)) { |
860d21e2 | 780 | *errp = -ENOMEM; |
2ed88685 | 781 | return NULL; |
ac27a0ec | 782 | } |
2ed88685 TT |
783 | if (map.m_flags & EXT4_MAP_NEW) { |
784 | J_ASSERT(create != 0); | |
785 | J_ASSERT(handle != NULL); | |
ac27a0ec | 786 | |
2ed88685 TT |
787 | /* |
788 | * Now that we do not always journal data, we should | |
789 | * keep in mind whether this should always journal the | |
790 | * new buffer as metadata. For now, regular file | |
791 | * writes use ext4_get_block instead, so it's not a | |
792 | * problem. | |
793 | */ | |
794 | lock_buffer(bh); | |
795 | BUFFER_TRACE(bh, "call get_create_access"); | |
796 | fatal = ext4_journal_get_create_access(handle, bh); | |
797 | if (!fatal && !buffer_uptodate(bh)) { | |
798 | memset(bh->b_data, 0, inode->i_sb->s_blocksize); | |
799 | set_buffer_uptodate(bh); | |
ac27a0ec | 800 | } |
2ed88685 TT |
801 | unlock_buffer(bh); |
802 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); | |
803 | err = ext4_handle_dirty_metadata(handle, inode, bh); | |
804 | if (!fatal) | |
805 | fatal = err; | |
806 | } else { | |
807 | BUFFER_TRACE(bh, "not a new buffer"); | |
ac27a0ec | 808 | } |
2ed88685 TT |
809 | if (fatal) { |
810 | *errp = fatal; | |
811 | brelse(bh); | |
812 | bh = NULL; | |
813 | } | |
814 | return bh; | |
ac27a0ec DK |
815 | } |
816 | ||
617ba13b | 817 | struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode, |
725d26d3 | 818 | ext4_lblk_t block, int create, int *err) |
ac27a0ec | 819 | { |
af5bc92d | 820 | struct buffer_head *bh; |
ac27a0ec | 821 | |
617ba13b | 822 | bh = ext4_getblk(handle, inode, block, create, err); |
ac27a0ec DK |
823 | if (!bh) |
824 | return bh; | |
825 | if (buffer_uptodate(bh)) | |
826 | return bh; | |
65299a3b | 827 | ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &bh); |
ac27a0ec DK |
828 | wait_on_buffer(bh); |
829 | if (buffer_uptodate(bh)) | |
830 | return bh; | |
831 | put_bh(bh); | |
832 | *err = -EIO; | |
833 | return NULL; | |
834 | } | |
835 | ||
f19d5870 TM |
836 | int ext4_walk_page_buffers(handle_t *handle, |
837 | struct buffer_head *head, | |
838 | unsigned from, | |
839 | unsigned to, | |
840 | int *partial, | |
841 | int (*fn)(handle_t *handle, | |
842 | struct buffer_head *bh)) | |
ac27a0ec DK |
843 | { |
844 | struct buffer_head *bh; | |
845 | unsigned block_start, block_end; | |
846 | unsigned blocksize = head->b_size; | |
847 | int err, ret = 0; | |
848 | struct buffer_head *next; | |
849 | ||
af5bc92d TT |
850 | for (bh = head, block_start = 0; |
851 | ret == 0 && (bh != head || !block_start); | |
de9a55b8 | 852 | block_start = block_end, bh = next) { |
ac27a0ec DK |
853 | next = bh->b_this_page; |
854 | block_end = block_start + blocksize; | |
855 | if (block_end <= from || block_start >= to) { | |
856 | if (partial && !buffer_uptodate(bh)) | |
857 | *partial = 1; | |
858 | continue; | |
859 | } | |
860 | err = (*fn)(handle, bh); | |
861 | if (!ret) | |
862 | ret = err; | |
863 | } | |
864 | return ret; | |
865 | } | |
866 | ||
867 | /* | |
868 | * To preserve ordering, it is essential that the hole instantiation and | |
869 | * the data write be encapsulated in a single transaction. We cannot | |
617ba13b | 870 | * close off a transaction and start a new one between the ext4_get_block() |
dab291af | 871 | * and the commit_write(). So doing the jbd2_journal_start at the start of |
ac27a0ec DK |
872 | * prepare_write() is the right place. |
873 | * | |
36ade451 JK |
874 | * Also, this function can nest inside ext4_writepage(). In that case, we |
875 | * *know* that ext4_writepage() has generated enough buffer credits to do the | |
876 | * whole page. So we won't block on the journal in that case, which is good, | |
877 | * because the caller may be PF_MEMALLOC. | |
ac27a0ec | 878 | * |
617ba13b | 879 | * By accident, ext4 can be reentered when a transaction is open via |
ac27a0ec DK |
880 | * quota file writes. If we were to commit the transaction while thus |
881 | * reentered, there can be a deadlock - we would be holding a quota | |
882 | * lock, and the commit would never complete if another thread had a | |
883 | * transaction open and was blocking on the quota lock - a ranking | |
884 | * violation. | |
885 | * | |
dab291af | 886 | * So what we do is to rely on the fact that jbd2_journal_stop/journal_start |
ac27a0ec DK |
887 | * will _not_ run commit under these circumstances because handle->h_ref |
888 | * is elevated. We'll still have enough credits for the tiny quotafile | |
889 | * write. | |
890 | */ | |
f19d5870 TM |
891 | int do_journal_get_write_access(handle_t *handle, |
892 | struct buffer_head *bh) | |
ac27a0ec | 893 | { |
56d35a4c JK |
894 | int dirty = buffer_dirty(bh); |
895 | int ret; | |
896 | ||
ac27a0ec DK |
897 | if (!buffer_mapped(bh) || buffer_freed(bh)) |
898 | return 0; | |
56d35a4c | 899 | /* |
ebdec241 | 900 | * __block_write_begin() could have dirtied some buffers. Clean |
56d35a4c JK |
901 | * the dirty bit as jbd2_journal_get_write_access() could complain |
902 | * otherwise about fs integrity issues. Setting of the dirty bit | |
ebdec241 | 903 | * by __block_write_begin() isn't a real problem here as we clear |
56d35a4c JK |
904 | * the bit before releasing a page lock and thus writeback cannot |
905 | * ever write the buffer. | |
906 | */ | |
907 | if (dirty) | |
908 | clear_buffer_dirty(bh); | |
909 | ret = ext4_journal_get_write_access(handle, bh); | |
910 | if (!ret && dirty) | |
911 | ret = ext4_handle_dirty_metadata(handle, NULL, bh); | |
912 | return ret; | |
ac27a0ec DK |
913 | } |
914 | ||
8b0f165f AP |
915 | static int ext4_get_block_write_nolock(struct inode *inode, sector_t iblock, |
916 | struct buffer_head *bh_result, int create); | |
bfc1af65 | 917 | static int ext4_write_begin(struct file *file, struct address_space *mapping, |
de9a55b8 TT |
918 | loff_t pos, unsigned len, unsigned flags, |
919 | struct page **pagep, void **fsdata) | |
ac27a0ec | 920 | { |
af5bc92d | 921 | struct inode *inode = mapping->host; |
1938a150 | 922 | int ret, needed_blocks; |
ac27a0ec DK |
923 | handle_t *handle; |
924 | int retries = 0; | |
af5bc92d | 925 | struct page *page; |
de9a55b8 | 926 | pgoff_t index; |
af5bc92d | 927 | unsigned from, to; |
bfc1af65 | 928 | |
9bffad1e | 929 | trace_ext4_write_begin(inode, pos, len, flags); |
1938a150 AK |
930 | /* |
931 | * Reserve one block more for addition to orphan list in case | |
932 | * we allocate blocks but write fails for some reason | |
933 | */ | |
934 | needed_blocks = ext4_writepage_trans_blocks(inode) + 1; | |
de9a55b8 | 935 | index = pos >> PAGE_CACHE_SHIFT; |
af5bc92d TT |
936 | from = pos & (PAGE_CACHE_SIZE - 1); |
937 | to = from + len; | |
ac27a0ec | 938 | |
f19d5870 TM |
939 | if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) { |
940 | ret = ext4_try_to_write_inline_data(mapping, inode, pos, len, | |
941 | flags, pagep); | |
942 | if (ret < 0) | |
47564bfb TT |
943 | return ret; |
944 | if (ret == 1) | |
945 | return 0; | |
f19d5870 TM |
946 | } |
947 | ||
47564bfb TT |
948 | /* |
949 | * grab_cache_page_write_begin() can take a long time if the | |
950 | * system is thrashing due to memory pressure, or if the page | |
951 | * is being written back. So grab it first before we start | |
952 | * the transaction handle. This also allows us to allocate | |
953 | * the page (if needed) without using GFP_NOFS. | |
954 | */ | |
955 | retry_grab: | |
956 | page = grab_cache_page_write_begin(mapping, index, flags); | |
957 | if (!page) | |
958 | return -ENOMEM; | |
959 | unlock_page(page); | |
960 | ||
961 | retry_journal: | |
9924a92a | 962 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks); |
af5bc92d | 963 | if (IS_ERR(handle)) { |
47564bfb TT |
964 | page_cache_release(page); |
965 | return PTR_ERR(handle); | |
7479d2b9 | 966 | } |
ac27a0ec | 967 | |
47564bfb TT |
968 | lock_page(page); |
969 | if (page->mapping != mapping) { | |
970 | /* The page got truncated from under us */ | |
971 | unlock_page(page); | |
972 | page_cache_release(page); | |
cf108bca | 973 | ext4_journal_stop(handle); |
47564bfb | 974 | goto retry_grab; |
cf108bca | 975 | } |
7afe5aa5 DM |
976 | /* In case writeback began while the page was unlocked */ |
977 | wait_for_stable_page(page); | |
cf108bca | 978 | |
744692dc | 979 | if (ext4_should_dioread_nolock(inode)) |
6e1db88d | 980 | ret = __block_write_begin(page, pos, len, ext4_get_block_write); |
744692dc | 981 | else |
6e1db88d | 982 | ret = __block_write_begin(page, pos, len, ext4_get_block); |
bfc1af65 NP |
983 | |
984 | if (!ret && ext4_should_journal_data(inode)) { | |
f19d5870 TM |
985 | ret = ext4_walk_page_buffers(handle, page_buffers(page), |
986 | from, to, NULL, | |
987 | do_journal_get_write_access); | |
ac27a0ec | 988 | } |
bfc1af65 NP |
989 | |
990 | if (ret) { | |
af5bc92d | 991 | unlock_page(page); |
ae4d5372 | 992 | /* |
6e1db88d | 993 | * __block_write_begin may have instantiated a few blocks |
ae4d5372 AK |
994 | * outside i_size. Trim these off again. Don't need |
995 | * i_size_read because we hold i_mutex. | |
1938a150 AK |
996 | * |
997 | * Add inode to orphan list in case we crash before | |
998 | * truncate finishes | |
ae4d5372 | 999 | */ |
ffacfa7a | 1000 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
1938a150 AK |
1001 | ext4_orphan_add(handle, inode); |
1002 | ||
1003 | ext4_journal_stop(handle); | |
1004 | if (pos + len > inode->i_size) { | |
b9a4207d | 1005 | ext4_truncate_failed_write(inode); |
de9a55b8 | 1006 | /* |
ffacfa7a | 1007 | * If truncate failed early the inode might |
1938a150 AK |
1008 | * still be on the orphan list; we need to |
1009 | * make sure the inode is removed from the | |
1010 | * orphan list in that case. | |
1011 | */ | |
1012 | if (inode->i_nlink) | |
1013 | ext4_orphan_del(NULL, inode); | |
1014 | } | |
bfc1af65 | 1015 | |
47564bfb TT |
1016 | if (ret == -ENOSPC && |
1017 | ext4_should_retry_alloc(inode->i_sb, &retries)) | |
1018 | goto retry_journal; | |
1019 | page_cache_release(page); | |
1020 | return ret; | |
1021 | } | |
1022 | *pagep = page; | |
ac27a0ec DK |
1023 | return ret; |
1024 | } | |
1025 | ||
bfc1af65 NP |
1026 | /* For write_end() in data=journal mode */ |
1027 | static int write_end_fn(handle_t *handle, struct buffer_head *bh) | |
ac27a0ec | 1028 | { |
13fca323 | 1029 | int ret; |
ac27a0ec DK |
1030 | if (!buffer_mapped(bh) || buffer_freed(bh)) |
1031 | return 0; | |
1032 | set_buffer_uptodate(bh); | |
13fca323 TT |
1033 | ret = ext4_handle_dirty_metadata(handle, NULL, bh); |
1034 | clear_buffer_meta(bh); | |
1035 | clear_buffer_prio(bh); | |
1036 | return ret; | |
ac27a0ec DK |
1037 | } |
1038 | ||
eed4333f ZL |
1039 | /* |
1040 | * We need to pick up the new inode size which generic_commit_write gave us | |
1041 | * `file' can be NULL - eg, when called from page_symlink(). | |
1042 | * | |
1043 | * ext4 never places buffers on inode->i_mapping->private_list. metadata | |
1044 | * buffers are managed internally. | |
1045 | */ | |
1046 | static int ext4_write_end(struct file *file, | |
1047 | struct address_space *mapping, | |
1048 | loff_t pos, unsigned len, unsigned copied, | |
1049 | struct page *page, void *fsdata) | |
f8514083 | 1050 | { |
f8514083 | 1051 | handle_t *handle = ext4_journal_current_handle(); |
eed4333f ZL |
1052 | struct inode *inode = mapping->host; |
1053 | int ret = 0, ret2; | |
1054 | int i_size_changed = 0; | |
1055 | ||
1056 | trace_ext4_write_end(inode, pos, len, copied); | |
1057 | if (ext4_test_inode_state(inode, EXT4_STATE_ORDERED_MODE)) { | |
1058 | ret = ext4_jbd2_file_inode(handle, inode); | |
1059 | if (ret) { | |
1060 | unlock_page(page); | |
1061 | page_cache_release(page); | |
1062 | goto errout; | |
1063 | } | |
1064 | } | |
f8514083 | 1065 | |
42c832de TT |
1066 | if (ext4_has_inline_data(inode)) { |
1067 | ret = ext4_write_inline_data_end(inode, pos, len, | |
1068 | copied, page); | |
1069 | if (ret < 0) | |
1070 | goto errout; | |
1071 | copied = ret; | |
1072 | } else | |
f19d5870 TM |
1073 | copied = block_write_end(file, mapping, pos, |
1074 | len, copied, page, fsdata); | |
f8514083 AK |
1075 | |
1076 | /* | |
1077 | * No need to use i_size_read() here, the i_size | |
eed4333f | 1078 | * cannot change under us because we hole i_mutex. |
f8514083 AK |
1079 | * |
1080 | * But it's important to update i_size while still holding page lock: | |
1081 | * page writeout could otherwise come in and zero beyond i_size. | |
1082 | */ | |
1083 | if (pos + copied > inode->i_size) { | |
1084 | i_size_write(inode, pos + copied); | |
1085 | i_size_changed = 1; | |
1086 | } | |
1087 | ||
eed4333f | 1088 | if (pos + copied > EXT4_I(inode)->i_disksize) { |
f8514083 AK |
1089 | /* We need to mark inode dirty even if |
1090 | * new_i_size is less that inode->i_size | |
eed4333f | 1091 | * but greater than i_disksize. (hint delalloc) |
f8514083 AK |
1092 | */ |
1093 | ext4_update_i_disksize(inode, (pos + copied)); | |
1094 | i_size_changed = 1; | |
1095 | } | |
1096 | unlock_page(page); | |
1097 | page_cache_release(page); | |
1098 | ||
1099 | /* | |
1100 | * Don't mark the inode dirty under page lock. First, it unnecessarily | |
1101 | * makes the holding time of page lock longer. Second, it forces lock | |
1102 | * ordering of page lock and transaction start for journaling | |
1103 | * filesystems. | |
1104 | */ | |
1105 | if (i_size_changed) | |
1106 | ext4_mark_inode_dirty(handle, inode); | |
1107 | ||
ffacfa7a | 1108 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
f8514083 AK |
1109 | /* if we have allocated more blocks and copied |
1110 | * less. We will have blocks allocated outside | |
1111 | * inode->i_size. So truncate them | |
1112 | */ | |
1113 | ext4_orphan_add(handle, inode); | |
74d553aa | 1114 | errout: |
617ba13b | 1115 | ret2 = ext4_journal_stop(handle); |
ac27a0ec DK |
1116 | if (!ret) |
1117 | ret = ret2; | |
bfc1af65 | 1118 | |
f8514083 | 1119 | if (pos + len > inode->i_size) { |
b9a4207d | 1120 | ext4_truncate_failed_write(inode); |
de9a55b8 | 1121 | /* |
ffacfa7a | 1122 | * If truncate failed early the inode might still be |
f8514083 AK |
1123 | * on the orphan list; we need to make sure the inode |
1124 | * is removed from the orphan list in that case. | |
1125 | */ | |
1126 | if (inode->i_nlink) | |
1127 | ext4_orphan_del(NULL, inode); | |
1128 | } | |
1129 | ||
bfc1af65 | 1130 | return ret ? ret : copied; |
ac27a0ec DK |
1131 | } |
1132 | ||
bfc1af65 | 1133 | static int ext4_journalled_write_end(struct file *file, |
de9a55b8 TT |
1134 | struct address_space *mapping, |
1135 | loff_t pos, unsigned len, unsigned copied, | |
1136 | struct page *page, void *fsdata) | |
ac27a0ec | 1137 | { |
617ba13b | 1138 | handle_t *handle = ext4_journal_current_handle(); |
bfc1af65 | 1139 | struct inode *inode = mapping->host; |
ac27a0ec DK |
1140 | int ret = 0, ret2; |
1141 | int partial = 0; | |
bfc1af65 | 1142 | unsigned from, to; |
cf17fea6 | 1143 | loff_t new_i_size; |
ac27a0ec | 1144 | |
9bffad1e | 1145 | trace_ext4_journalled_write_end(inode, pos, len, copied); |
bfc1af65 NP |
1146 | from = pos & (PAGE_CACHE_SIZE - 1); |
1147 | to = from + len; | |
1148 | ||
441c8508 CW |
1149 | BUG_ON(!ext4_handle_valid(handle)); |
1150 | ||
3fdcfb66 TM |
1151 | if (ext4_has_inline_data(inode)) |
1152 | copied = ext4_write_inline_data_end(inode, pos, len, | |
1153 | copied, page); | |
1154 | else { | |
1155 | if (copied < len) { | |
1156 | if (!PageUptodate(page)) | |
1157 | copied = 0; | |
1158 | page_zero_new_buffers(page, from+copied, to); | |
1159 | } | |
ac27a0ec | 1160 | |
3fdcfb66 TM |
1161 | ret = ext4_walk_page_buffers(handle, page_buffers(page), from, |
1162 | to, &partial, write_end_fn); | |
1163 | if (!partial) | |
1164 | SetPageUptodate(page); | |
1165 | } | |
cf17fea6 AK |
1166 | new_i_size = pos + copied; |
1167 | if (new_i_size > inode->i_size) | |
bfc1af65 | 1168 | i_size_write(inode, pos+copied); |
19f5fb7a | 1169 | ext4_set_inode_state(inode, EXT4_STATE_JDATA); |
2d859db3 | 1170 | EXT4_I(inode)->i_datasync_tid = handle->h_transaction->t_tid; |
cf17fea6 AK |
1171 | if (new_i_size > EXT4_I(inode)->i_disksize) { |
1172 | ext4_update_i_disksize(inode, new_i_size); | |
617ba13b | 1173 | ret2 = ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
1174 | if (!ret) |
1175 | ret = ret2; | |
1176 | } | |
bfc1af65 | 1177 | |
cf108bca | 1178 | unlock_page(page); |
f8514083 | 1179 | page_cache_release(page); |
ffacfa7a | 1180 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
f8514083 AK |
1181 | /* if we have allocated more blocks and copied |
1182 | * less. We will have blocks allocated outside | |
1183 | * inode->i_size. So truncate them | |
1184 | */ | |
1185 | ext4_orphan_add(handle, inode); | |
1186 | ||
617ba13b | 1187 | ret2 = ext4_journal_stop(handle); |
ac27a0ec DK |
1188 | if (!ret) |
1189 | ret = ret2; | |
f8514083 | 1190 | if (pos + len > inode->i_size) { |
b9a4207d | 1191 | ext4_truncate_failed_write(inode); |
de9a55b8 | 1192 | /* |
ffacfa7a | 1193 | * If truncate failed early the inode might still be |
f8514083 AK |
1194 | * on the orphan list; we need to make sure the inode |
1195 | * is removed from the orphan list in that case. | |
1196 | */ | |
1197 | if (inode->i_nlink) | |
1198 | ext4_orphan_del(NULL, inode); | |
1199 | } | |
bfc1af65 NP |
1200 | |
1201 | return ret ? ret : copied; | |
ac27a0ec | 1202 | } |
d2a17637 | 1203 | |
386ad67c LC |
1204 | /* |
1205 | * Reserve a metadata for a single block located at lblock | |
1206 | */ | |
1207 | static int ext4_da_reserve_metadata(struct inode *inode, ext4_lblk_t lblock) | |
1208 | { | |
1209 | int retries = 0; | |
1210 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
1211 | struct ext4_inode_info *ei = EXT4_I(inode); | |
1212 | unsigned int md_needed; | |
1213 | ext4_lblk_t save_last_lblock; | |
1214 | int save_len; | |
1215 | ||
1216 | /* | |
1217 | * recalculate the amount of metadata blocks to reserve | |
1218 | * in order to allocate nrblocks | |
1219 | * worse case is one extent per block | |
1220 | */ | |
1221 | repeat: | |
1222 | spin_lock(&ei->i_block_reservation_lock); | |
1223 | /* | |
1224 | * ext4_calc_metadata_amount() has side effects, which we have | |
1225 | * to be prepared undo if we fail to claim space. | |
1226 | */ | |
1227 | save_len = ei->i_da_metadata_calc_len; | |
1228 | save_last_lblock = ei->i_da_metadata_calc_last_lblock; | |
1229 | md_needed = EXT4_NUM_B2C(sbi, | |
1230 | ext4_calc_metadata_amount(inode, lblock)); | |
1231 | trace_ext4_da_reserve_space(inode, md_needed); | |
1232 | ||
1233 | /* | |
1234 | * We do still charge estimated metadata to the sb though; | |
1235 | * we cannot afford to run out of free blocks. | |
1236 | */ | |
1237 | if (ext4_claim_free_clusters(sbi, md_needed, 0)) { | |
1238 | ei->i_da_metadata_calc_len = save_len; | |
1239 | ei->i_da_metadata_calc_last_lblock = save_last_lblock; | |
1240 | spin_unlock(&ei->i_block_reservation_lock); | |
1241 | if (ext4_should_retry_alloc(inode->i_sb, &retries)) { | |
1242 | cond_resched(); | |
1243 | goto repeat; | |
1244 | } | |
1245 | return -ENOSPC; | |
1246 | } | |
1247 | ei->i_reserved_meta_blocks += md_needed; | |
1248 | spin_unlock(&ei->i_block_reservation_lock); | |
1249 | ||
1250 | return 0; /* success */ | |
1251 | } | |
1252 | ||
9d0be502 | 1253 | /* |
7b415bf6 | 1254 | * Reserve a single cluster located at lblock |
9d0be502 | 1255 | */ |
01f49d0b | 1256 | static int ext4_da_reserve_space(struct inode *inode, ext4_lblk_t lblock) |
d2a17637 | 1257 | { |
030ba6bc | 1258 | int retries = 0; |
60e58e0f | 1259 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
0637c6f4 | 1260 | struct ext4_inode_info *ei = EXT4_I(inode); |
7b415bf6 | 1261 | unsigned int md_needed; |
5dd4056d | 1262 | int ret; |
03179fe9 TT |
1263 | ext4_lblk_t save_last_lblock; |
1264 | int save_len; | |
1265 | ||
1266 | /* | |
1267 | * We will charge metadata quota at writeout time; this saves | |
1268 | * us from metadata over-estimation, though we may go over by | |
1269 | * a small amount in the end. Here we just reserve for data. | |
1270 | */ | |
1271 | ret = dquot_reserve_block(inode, EXT4_C2B(sbi, 1)); | |
1272 | if (ret) | |
1273 | return ret; | |
d2a17637 MC |
1274 | |
1275 | /* | |
1276 | * recalculate the amount of metadata blocks to reserve | |
1277 | * in order to allocate nrblocks | |
1278 | * worse case is one extent per block | |
1279 | */ | |
030ba6bc | 1280 | repeat: |
0637c6f4 | 1281 | spin_lock(&ei->i_block_reservation_lock); |
03179fe9 TT |
1282 | /* |
1283 | * ext4_calc_metadata_amount() has side effects, which we have | |
1284 | * to be prepared undo if we fail to claim space. | |
1285 | */ | |
1286 | save_len = ei->i_da_metadata_calc_len; | |
1287 | save_last_lblock = ei->i_da_metadata_calc_last_lblock; | |
7b415bf6 AK |
1288 | md_needed = EXT4_NUM_B2C(sbi, |
1289 | ext4_calc_metadata_amount(inode, lblock)); | |
f8ec9d68 | 1290 | trace_ext4_da_reserve_space(inode, md_needed); |
d2a17637 | 1291 | |
72b8ab9d ES |
1292 | /* |
1293 | * We do still charge estimated metadata to the sb though; | |
1294 | * we cannot afford to run out of free blocks. | |
1295 | */ | |
e7d5f315 | 1296 | if (ext4_claim_free_clusters(sbi, md_needed + 1, 0)) { |
03179fe9 TT |
1297 | ei->i_da_metadata_calc_len = save_len; |
1298 | ei->i_da_metadata_calc_last_lblock = save_last_lblock; | |
1299 | spin_unlock(&ei->i_block_reservation_lock); | |
030ba6bc | 1300 | if (ext4_should_retry_alloc(inode->i_sb, &retries)) { |
bb8b20ed | 1301 | cond_resched(); |
030ba6bc AK |
1302 | goto repeat; |
1303 | } | |
03179fe9 | 1304 | dquot_release_reservation_block(inode, EXT4_C2B(sbi, 1)); |
d2a17637 MC |
1305 | return -ENOSPC; |
1306 | } | |
9d0be502 | 1307 | ei->i_reserved_data_blocks++; |
0637c6f4 TT |
1308 | ei->i_reserved_meta_blocks += md_needed; |
1309 | spin_unlock(&ei->i_block_reservation_lock); | |
39bc680a | 1310 | |
d2a17637 MC |
1311 | return 0; /* success */ |
1312 | } | |
1313 | ||
12219aea | 1314 | static void ext4_da_release_space(struct inode *inode, int to_free) |
d2a17637 MC |
1315 | { |
1316 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
0637c6f4 | 1317 | struct ext4_inode_info *ei = EXT4_I(inode); |
d2a17637 | 1318 | |
cd213226 MC |
1319 | if (!to_free) |
1320 | return; /* Nothing to release, exit */ | |
1321 | ||
d2a17637 | 1322 | spin_lock(&EXT4_I(inode)->i_block_reservation_lock); |
cd213226 | 1323 | |
5a58ec87 | 1324 | trace_ext4_da_release_space(inode, to_free); |
0637c6f4 | 1325 | if (unlikely(to_free > ei->i_reserved_data_blocks)) { |
cd213226 | 1326 | /* |
0637c6f4 TT |
1327 | * if there aren't enough reserved blocks, then the |
1328 | * counter is messed up somewhere. Since this | |
1329 | * function is called from invalidate page, it's | |
1330 | * harmless to return without any action. | |
cd213226 | 1331 | */ |
8de5c325 | 1332 | ext4_warning(inode->i_sb, "ext4_da_release_space: " |
0637c6f4 | 1333 | "ino %lu, to_free %d with only %d reserved " |
1084f252 | 1334 | "data blocks", inode->i_ino, to_free, |
0637c6f4 TT |
1335 | ei->i_reserved_data_blocks); |
1336 | WARN_ON(1); | |
1337 | to_free = ei->i_reserved_data_blocks; | |
cd213226 | 1338 | } |
0637c6f4 | 1339 | ei->i_reserved_data_blocks -= to_free; |
cd213226 | 1340 | |
0637c6f4 TT |
1341 | if (ei->i_reserved_data_blocks == 0) { |
1342 | /* | |
1343 | * We can release all of the reserved metadata blocks | |
1344 | * only when we have written all of the delayed | |
1345 | * allocation blocks. | |
7b415bf6 AK |
1346 | * Note that in case of bigalloc, i_reserved_meta_blocks, |
1347 | * i_reserved_data_blocks, etc. refer to number of clusters. | |
0637c6f4 | 1348 | */ |
57042651 | 1349 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, |
72b8ab9d | 1350 | ei->i_reserved_meta_blocks); |
ee5f4d9c | 1351 | ei->i_reserved_meta_blocks = 0; |
9d0be502 | 1352 | ei->i_da_metadata_calc_len = 0; |
0637c6f4 | 1353 | } |
d2a17637 | 1354 | |
72b8ab9d | 1355 | /* update fs dirty data blocks counter */ |
57042651 | 1356 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, to_free); |
d2a17637 | 1357 | |
d2a17637 | 1358 | spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); |
60e58e0f | 1359 | |
7b415bf6 | 1360 | dquot_release_reservation_block(inode, EXT4_C2B(sbi, to_free)); |
d2a17637 MC |
1361 | } |
1362 | ||
1363 | static void ext4_da_page_release_reservation(struct page *page, | |
ca99fdd2 LC |
1364 | unsigned int offset, |
1365 | unsigned int length) | |
d2a17637 MC |
1366 | { |
1367 | int to_release = 0; | |
1368 | struct buffer_head *head, *bh; | |
1369 | unsigned int curr_off = 0; | |
7b415bf6 AK |
1370 | struct inode *inode = page->mapping->host; |
1371 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
ca99fdd2 | 1372 | unsigned int stop = offset + length; |
7b415bf6 | 1373 | int num_clusters; |
51865fda | 1374 | ext4_fsblk_t lblk; |
d2a17637 | 1375 | |
ca99fdd2 LC |
1376 | BUG_ON(stop > PAGE_CACHE_SIZE || stop < length); |
1377 | ||
d2a17637 MC |
1378 | head = page_buffers(page); |
1379 | bh = head; | |
1380 | do { | |
1381 | unsigned int next_off = curr_off + bh->b_size; | |
1382 | ||
ca99fdd2 LC |
1383 | if (next_off > stop) |
1384 | break; | |
1385 | ||
d2a17637 MC |
1386 | if ((offset <= curr_off) && (buffer_delay(bh))) { |
1387 | to_release++; | |
1388 | clear_buffer_delay(bh); | |
1389 | } | |
1390 | curr_off = next_off; | |
1391 | } while ((bh = bh->b_this_page) != head); | |
7b415bf6 | 1392 | |
51865fda ZL |
1393 | if (to_release) { |
1394 | lblk = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1395 | ext4_es_remove_extent(inode, lblk, to_release); | |
1396 | } | |
1397 | ||
7b415bf6 AK |
1398 | /* If we have released all the blocks belonging to a cluster, then we |
1399 | * need to release the reserved space for that cluster. */ | |
1400 | num_clusters = EXT4_NUM_B2C(sbi, to_release); | |
1401 | while (num_clusters > 0) { | |
7b415bf6 AK |
1402 | lblk = (page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits)) + |
1403 | ((num_clusters - 1) << sbi->s_cluster_bits); | |
1404 | if (sbi->s_cluster_ratio == 1 || | |
7d1b1fbc | 1405 | !ext4_find_delalloc_cluster(inode, lblk)) |
7b415bf6 AK |
1406 | ext4_da_release_space(inode, 1); |
1407 | ||
1408 | num_clusters--; | |
1409 | } | |
d2a17637 | 1410 | } |
ac27a0ec | 1411 | |
64769240 AT |
1412 | /* |
1413 | * Delayed allocation stuff | |
1414 | */ | |
1415 | ||
4e7ea81d JK |
1416 | struct mpage_da_data { |
1417 | struct inode *inode; | |
1418 | struct writeback_control *wbc; | |
6b523df4 | 1419 | |
4e7ea81d JK |
1420 | pgoff_t first_page; /* The first page to write */ |
1421 | pgoff_t next_page; /* Current page to examine */ | |
1422 | pgoff_t last_page; /* Last page to examine */ | |
791b7f08 | 1423 | /* |
4e7ea81d JK |
1424 | * Extent to map - this can be after first_page because that can be |
1425 | * fully mapped. We somewhat abuse m_flags to store whether the extent | |
1426 | * is delalloc or unwritten. | |
791b7f08 | 1427 | */ |
4e7ea81d JK |
1428 | struct ext4_map_blocks map; |
1429 | struct ext4_io_submit io_submit; /* IO submission data */ | |
1430 | }; | |
64769240 | 1431 | |
4e7ea81d JK |
1432 | static void mpage_release_unused_pages(struct mpage_da_data *mpd, |
1433 | bool invalidate) | |
c4a0c46e AK |
1434 | { |
1435 | int nr_pages, i; | |
1436 | pgoff_t index, end; | |
1437 | struct pagevec pvec; | |
1438 | struct inode *inode = mpd->inode; | |
1439 | struct address_space *mapping = inode->i_mapping; | |
4e7ea81d JK |
1440 | |
1441 | /* This is necessary when next_page == 0. */ | |
1442 | if (mpd->first_page >= mpd->next_page) | |
1443 | return; | |
c4a0c46e | 1444 | |
c7f5938a CW |
1445 | index = mpd->first_page; |
1446 | end = mpd->next_page - 1; | |
4e7ea81d JK |
1447 | if (invalidate) { |
1448 | ext4_lblk_t start, last; | |
1449 | start = index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1450 | last = end << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1451 | ext4_es_remove_extent(inode, start, last - start + 1); | |
1452 | } | |
51865fda | 1453 | |
66bea92c | 1454 | pagevec_init(&pvec, 0); |
c4a0c46e AK |
1455 | while (index <= end) { |
1456 | nr_pages = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE); | |
1457 | if (nr_pages == 0) | |
1458 | break; | |
1459 | for (i = 0; i < nr_pages; i++) { | |
1460 | struct page *page = pvec.pages[i]; | |
9b1d0998 | 1461 | if (page->index > end) |
c4a0c46e | 1462 | break; |
c4a0c46e AK |
1463 | BUG_ON(!PageLocked(page)); |
1464 | BUG_ON(PageWriteback(page)); | |
4e7ea81d JK |
1465 | if (invalidate) { |
1466 | block_invalidatepage(page, 0, PAGE_CACHE_SIZE); | |
1467 | ClearPageUptodate(page); | |
1468 | } | |
c4a0c46e AK |
1469 | unlock_page(page); |
1470 | } | |
9b1d0998 JK |
1471 | index = pvec.pages[nr_pages - 1]->index + 1; |
1472 | pagevec_release(&pvec); | |
c4a0c46e | 1473 | } |
c4a0c46e AK |
1474 | } |
1475 | ||
df22291f AK |
1476 | static void ext4_print_free_blocks(struct inode *inode) |
1477 | { | |
1478 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
92b97816 | 1479 | struct super_block *sb = inode->i_sb; |
f78ee70d | 1480 | struct ext4_inode_info *ei = EXT4_I(inode); |
92b97816 TT |
1481 | |
1482 | ext4_msg(sb, KERN_CRIT, "Total free blocks count %lld", | |
5dee5437 | 1483 | EXT4_C2B(EXT4_SB(inode->i_sb), |
f78ee70d | 1484 | ext4_count_free_clusters(sb))); |
92b97816 TT |
1485 | ext4_msg(sb, KERN_CRIT, "Free/Dirty block details"); |
1486 | ext4_msg(sb, KERN_CRIT, "free_blocks=%lld", | |
f78ee70d | 1487 | (long long) EXT4_C2B(EXT4_SB(sb), |
57042651 | 1488 | percpu_counter_sum(&sbi->s_freeclusters_counter))); |
92b97816 | 1489 | ext4_msg(sb, KERN_CRIT, "dirty_blocks=%lld", |
f78ee70d | 1490 | (long long) EXT4_C2B(EXT4_SB(sb), |
7b415bf6 | 1491 | percpu_counter_sum(&sbi->s_dirtyclusters_counter))); |
92b97816 TT |
1492 | ext4_msg(sb, KERN_CRIT, "Block reservation details"); |
1493 | ext4_msg(sb, KERN_CRIT, "i_reserved_data_blocks=%u", | |
f78ee70d | 1494 | ei->i_reserved_data_blocks); |
92b97816 | 1495 | ext4_msg(sb, KERN_CRIT, "i_reserved_meta_blocks=%u", |
f78ee70d LC |
1496 | ei->i_reserved_meta_blocks); |
1497 | ext4_msg(sb, KERN_CRIT, "i_allocated_meta_blocks=%u", | |
1498 | ei->i_allocated_meta_blocks); | |
df22291f AK |
1499 | return; |
1500 | } | |
1501 | ||
c364b22c | 1502 | static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh) |
29fa89d0 | 1503 | { |
c364b22c | 1504 | return (buffer_delay(bh) || buffer_unwritten(bh)) && buffer_dirty(bh); |
29fa89d0 AK |
1505 | } |
1506 | ||
5356f261 AK |
1507 | /* |
1508 | * This function is grabs code from the very beginning of | |
1509 | * ext4_map_blocks, but assumes that the caller is from delayed write | |
1510 | * time. This function looks up the requested blocks and sets the | |
1511 | * buffer delay bit under the protection of i_data_sem. | |
1512 | */ | |
1513 | static int ext4_da_map_blocks(struct inode *inode, sector_t iblock, | |
1514 | struct ext4_map_blocks *map, | |
1515 | struct buffer_head *bh) | |
1516 | { | |
d100eef2 | 1517 | struct extent_status es; |
5356f261 AK |
1518 | int retval; |
1519 | sector_t invalid_block = ~((sector_t) 0xffff); | |
921f266b DM |
1520 | #ifdef ES_AGGRESSIVE_TEST |
1521 | struct ext4_map_blocks orig_map; | |
1522 | ||
1523 | memcpy(&orig_map, map, sizeof(*map)); | |
1524 | #endif | |
5356f261 AK |
1525 | |
1526 | if (invalid_block < ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es)) | |
1527 | invalid_block = ~0; | |
1528 | ||
1529 | map->m_flags = 0; | |
1530 | ext_debug("ext4_da_map_blocks(): inode %lu, max_blocks %u," | |
1531 | "logical block %lu\n", inode->i_ino, map->m_len, | |
1532 | (unsigned long) map->m_lblk); | |
d100eef2 ZL |
1533 | |
1534 | /* Lookup extent status tree firstly */ | |
1535 | if (ext4_es_lookup_extent(inode, iblock, &es)) { | |
63b99968 | 1536 | ext4_es_lru_add(inode); |
d100eef2 ZL |
1537 | if (ext4_es_is_hole(&es)) { |
1538 | retval = 0; | |
1539 | down_read((&EXT4_I(inode)->i_data_sem)); | |
1540 | goto add_delayed; | |
1541 | } | |
1542 | ||
1543 | /* | |
1544 | * Delayed extent could be allocated by fallocate. | |
1545 | * So we need to check it. | |
1546 | */ | |
1547 | if (ext4_es_is_delayed(&es) && !ext4_es_is_unwritten(&es)) { | |
1548 | map_bh(bh, inode->i_sb, invalid_block); | |
1549 | set_buffer_new(bh); | |
1550 | set_buffer_delay(bh); | |
1551 | return 0; | |
1552 | } | |
1553 | ||
1554 | map->m_pblk = ext4_es_pblock(&es) + iblock - es.es_lblk; | |
1555 | retval = es.es_len - (iblock - es.es_lblk); | |
1556 | if (retval > map->m_len) | |
1557 | retval = map->m_len; | |
1558 | map->m_len = retval; | |
1559 | if (ext4_es_is_written(&es)) | |
1560 | map->m_flags |= EXT4_MAP_MAPPED; | |
1561 | else if (ext4_es_is_unwritten(&es)) | |
1562 | map->m_flags |= EXT4_MAP_UNWRITTEN; | |
1563 | else | |
1564 | BUG_ON(1); | |
1565 | ||
921f266b DM |
1566 | #ifdef ES_AGGRESSIVE_TEST |
1567 | ext4_map_blocks_es_recheck(NULL, inode, map, &orig_map, 0); | |
1568 | #endif | |
d100eef2 ZL |
1569 | return retval; |
1570 | } | |
1571 | ||
5356f261 AK |
1572 | /* |
1573 | * Try to see if we can get the block without requesting a new | |
1574 | * file system block. | |
1575 | */ | |
1576 | down_read((&EXT4_I(inode)->i_data_sem)); | |
9c3569b5 TM |
1577 | if (ext4_has_inline_data(inode)) { |
1578 | /* | |
1579 | * We will soon create blocks for this page, and let | |
1580 | * us pretend as if the blocks aren't allocated yet. | |
1581 | * In case of clusters, we have to handle the work | |
1582 | * of mapping from cluster so that the reserved space | |
1583 | * is calculated properly. | |
1584 | */ | |
1585 | if ((EXT4_SB(inode->i_sb)->s_cluster_ratio > 1) && | |
1586 | ext4_find_delalloc_cluster(inode, map->m_lblk)) | |
1587 | map->m_flags |= EXT4_MAP_FROM_CLUSTER; | |
1588 | retval = 0; | |
1589 | } else if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) | |
d100eef2 ZL |
1590 | retval = ext4_ext_map_blocks(NULL, inode, map, |
1591 | EXT4_GET_BLOCKS_NO_PUT_HOLE); | |
5356f261 | 1592 | else |
d100eef2 ZL |
1593 | retval = ext4_ind_map_blocks(NULL, inode, map, |
1594 | EXT4_GET_BLOCKS_NO_PUT_HOLE); | |
5356f261 | 1595 | |
d100eef2 | 1596 | add_delayed: |
5356f261 | 1597 | if (retval == 0) { |
f7fec032 | 1598 | int ret; |
5356f261 AK |
1599 | /* |
1600 | * XXX: __block_prepare_write() unmaps passed block, | |
1601 | * is it OK? | |
1602 | */ | |
386ad67c LC |
1603 | /* |
1604 | * If the block was allocated from previously allocated cluster, | |
1605 | * then we don't need to reserve it again. However we still need | |
1606 | * to reserve metadata for every block we're going to write. | |
1607 | */ | |
5356f261 | 1608 | if (!(map->m_flags & EXT4_MAP_FROM_CLUSTER)) { |
f7fec032 ZL |
1609 | ret = ext4_da_reserve_space(inode, iblock); |
1610 | if (ret) { | |
5356f261 | 1611 | /* not enough space to reserve */ |
f7fec032 | 1612 | retval = ret; |
5356f261 | 1613 | goto out_unlock; |
f7fec032 | 1614 | } |
386ad67c LC |
1615 | } else { |
1616 | ret = ext4_da_reserve_metadata(inode, iblock); | |
1617 | if (ret) { | |
1618 | /* not enough space to reserve */ | |
1619 | retval = ret; | |
1620 | goto out_unlock; | |
1621 | } | |
5356f261 AK |
1622 | } |
1623 | ||
f7fec032 ZL |
1624 | ret = ext4_es_insert_extent(inode, map->m_lblk, map->m_len, |
1625 | ~0, EXTENT_STATUS_DELAYED); | |
1626 | if (ret) { | |
1627 | retval = ret; | |
51865fda | 1628 | goto out_unlock; |
f7fec032 | 1629 | } |
51865fda | 1630 | |
5356f261 AK |
1631 | /* Clear EXT4_MAP_FROM_CLUSTER flag since its purpose is served |
1632 | * and it should not appear on the bh->b_state. | |
1633 | */ | |
1634 | map->m_flags &= ~EXT4_MAP_FROM_CLUSTER; | |
1635 | ||
1636 | map_bh(bh, inode->i_sb, invalid_block); | |
1637 | set_buffer_new(bh); | |
1638 | set_buffer_delay(bh); | |
f7fec032 ZL |
1639 | } else if (retval > 0) { |
1640 | int ret; | |
3be78c73 | 1641 | unsigned int status; |
f7fec032 | 1642 | |
44fb851d ZL |
1643 | if (unlikely(retval != map->m_len)) { |
1644 | ext4_warning(inode->i_sb, | |
1645 | "ES len assertion failed for inode " | |
1646 | "%lu: retval %d != map->m_len %d", | |
1647 | inode->i_ino, retval, map->m_len); | |
1648 | WARN_ON(1); | |
921f266b | 1649 | } |
921f266b | 1650 | |
f7fec032 ZL |
1651 | status = map->m_flags & EXT4_MAP_UNWRITTEN ? |
1652 | EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN; | |
1653 | ret = ext4_es_insert_extent(inode, map->m_lblk, map->m_len, | |
1654 | map->m_pblk, status); | |
1655 | if (ret != 0) | |
1656 | retval = ret; | |
5356f261 AK |
1657 | } |
1658 | ||
1659 | out_unlock: | |
1660 | up_read((&EXT4_I(inode)->i_data_sem)); | |
1661 | ||
1662 | return retval; | |
1663 | } | |
1664 | ||
64769240 | 1665 | /* |
b920c755 TT |
1666 | * This is a special get_blocks_t callback which is used by |
1667 | * ext4_da_write_begin(). It will either return mapped block or | |
1668 | * reserve space for a single block. | |
29fa89d0 AK |
1669 | * |
1670 | * For delayed buffer_head we have BH_Mapped, BH_New, BH_Delay set. | |
1671 | * We also have b_blocknr = -1 and b_bdev initialized properly | |
1672 | * | |
1673 | * For unwritten buffer_head we have BH_Mapped, BH_New, BH_Unwritten set. | |
1674 | * We also have b_blocknr = physicalblock mapping unwritten extent and b_bdev | |
1675 | * initialized properly. | |
64769240 | 1676 | */ |
9c3569b5 TM |
1677 | int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, |
1678 | struct buffer_head *bh, int create) | |
64769240 | 1679 | { |
2ed88685 | 1680 | struct ext4_map_blocks map; |
64769240 AT |
1681 | int ret = 0; |
1682 | ||
1683 | BUG_ON(create == 0); | |
2ed88685 TT |
1684 | BUG_ON(bh->b_size != inode->i_sb->s_blocksize); |
1685 | ||
1686 | map.m_lblk = iblock; | |
1687 | map.m_len = 1; | |
64769240 AT |
1688 | |
1689 | /* | |
1690 | * first, we need to know whether the block is allocated already | |
1691 | * preallocated blocks are unmapped but should treated | |
1692 | * the same as allocated blocks. | |
1693 | */ | |
5356f261 AK |
1694 | ret = ext4_da_map_blocks(inode, iblock, &map, bh); |
1695 | if (ret <= 0) | |
2ed88685 | 1696 | return ret; |
64769240 | 1697 | |
2ed88685 TT |
1698 | map_bh(bh, inode->i_sb, map.m_pblk); |
1699 | bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags; | |
1700 | ||
1701 | if (buffer_unwritten(bh)) { | |
1702 | /* A delayed write to unwritten bh should be marked | |
1703 | * new and mapped. Mapped ensures that we don't do | |
1704 | * get_block multiple times when we write to the same | |
1705 | * offset and new ensures that we do proper zero out | |
1706 | * for partial write. | |
1707 | */ | |
1708 | set_buffer_new(bh); | |
c8205636 | 1709 | set_buffer_mapped(bh); |
2ed88685 TT |
1710 | } |
1711 | return 0; | |
64769240 | 1712 | } |
61628a3f | 1713 | |
62e086be AK |
1714 | static int bget_one(handle_t *handle, struct buffer_head *bh) |
1715 | { | |
1716 | get_bh(bh); | |
1717 | return 0; | |
1718 | } | |
1719 | ||
1720 | static int bput_one(handle_t *handle, struct buffer_head *bh) | |
1721 | { | |
1722 | put_bh(bh); | |
1723 | return 0; | |
1724 | } | |
1725 | ||
1726 | static int __ext4_journalled_writepage(struct page *page, | |
62e086be AK |
1727 | unsigned int len) |
1728 | { | |
1729 | struct address_space *mapping = page->mapping; | |
1730 | struct inode *inode = mapping->host; | |
3fdcfb66 | 1731 | struct buffer_head *page_bufs = NULL; |
62e086be | 1732 | handle_t *handle = NULL; |
3fdcfb66 TM |
1733 | int ret = 0, err = 0; |
1734 | int inline_data = ext4_has_inline_data(inode); | |
1735 | struct buffer_head *inode_bh = NULL; | |
62e086be | 1736 | |
cb20d518 | 1737 | ClearPageChecked(page); |
3fdcfb66 TM |
1738 | |
1739 | if (inline_data) { | |
1740 | BUG_ON(page->index != 0); | |
1741 | BUG_ON(len > ext4_get_max_inline_size(inode)); | |
1742 | inode_bh = ext4_journalled_write_inline_data(inode, len, page); | |
1743 | if (inode_bh == NULL) | |
1744 | goto out; | |
1745 | } else { | |
1746 | page_bufs = page_buffers(page); | |
1747 | if (!page_bufs) { | |
1748 | BUG(); | |
1749 | goto out; | |
1750 | } | |
1751 | ext4_walk_page_buffers(handle, page_bufs, 0, len, | |
1752 | NULL, bget_one); | |
1753 | } | |
62e086be AK |
1754 | /* As soon as we unlock the page, it can go away, but we have |
1755 | * references to buffers so we are safe */ | |
1756 | unlock_page(page); | |
1757 | ||
9924a92a TT |
1758 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, |
1759 | ext4_writepage_trans_blocks(inode)); | |
62e086be AK |
1760 | if (IS_ERR(handle)) { |
1761 | ret = PTR_ERR(handle); | |
1762 | goto out; | |
1763 | } | |
1764 | ||
441c8508 CW |
1765 | BUG_ON(!ext4_handle_valid(handle)); |
1766 | ||
3fdcfb66 TM |
1767 | if (inline_data) { |
1768 | ret = ext4_journal_get_write_access(handle, inode_bh); | |
62e086be | 1769 | |
3fdcfb66 TM |
1770 | err = ext4_handle_dirty_metadata(handle, inode, inode_bh); |
1771 | ||
1772 | } else { | |
1773 | ret = ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL, | |
1774 | do_journal_get_write_access); | |
1775 | ||
1776 | err = ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL, | |
1777 | write_end_fn); | |
1778 | } | |
62e086be AK |
1779 | if (ret == 0) |
1780 | ret = err; | |
2d859db3 | 1781 | EXT4_I(inode)->i_datasync_tid = handle->h_transaction->t_tid; |
62e086be AK |
1782 | err = ext4_journal_stop(handle); |
1783 | if (!ret) | |
1784 | ret = err; | |
1785 | ||
3fdcfb66 TM |
1786 | if (!ext4_has_inline_data(inode)) |
1787 | ext4_walk_page_buffers(handle, page_bufs, 0, len, | |
1788 | NULL, bput_one); | |
19f5fb7a | 1789 | ext4_set_inode_state(inode, EXT4_STATE_JDATA); |
62e086be | 1790 | out: |
3fdcfb66 | 1791 | brelse(inode_bh); |
62e086be AK |
1792 | return ret; |
1793 | } | |
1794 | ||
61628a3f | 1795 | /* |
43ce1d23 AK |
1796 | * Note that we don't need to start a transaction unless we're journaling data |
1797 | * because we should have holes filled from ext4_page_mkwrite(). We even don't | |
1798 | * need to file the inode to the transaction's list in ordered mode because if | |
1799 | * we are writing back data added by write(), the inode is already there and if | |
25985edc | 1800 | * we are writing back data modified via mmap(), no one guarantees in which |
43ce1d23 AK |
1801 | * transaction the data will hit the disk. In case we are journaling data, we |
1802 | * cannot start transaction directly because transaction start ranks above page | |
1803 | * lock so we have to do some magic. | |
1804 | * | |
b920c755 | 1805 | * This function can get called via... |
20970ba6 | 1806 | * - ext4_writepages after taking page lock (have journal handle) |
b920c755 | 1807 | * - journal_submit_inode_data_buffers (no journal handle) |
f6463b0d | 1808 | * - shrink_page_list via the kswapd/direct reclaim (no journal handle) |
b920c755 | 1809 | * - grab_page_cache when doing write_begin (have journal handle) |
43ce1d23 AK |
1810 | * |
1811 | * We don't do any block allocation in this function. If we have page with | |
1812 | * multiple blocks we need to write those buffer_heads that are mapped. This | |
1813 | * is important for mmaped based write. So if we do with blocksize 1K | |
1814 | * truncate(f, 1024); | |
1815 | * a = mmap(f, 0, 4096); | |
1816 | * a[0] = 'a'; | |
1817 | * truncate(f, 4096); | |
1818 | * we have in the page first buffer_head mapped via page_mkwrite call back | |
90802ed9 | 1819 | * but other buffer_heads would be unmapped but dirty (dirty done via the |
43ce1d23 AK |
1820 | * do_wp_page). So writepage should write the first block. If we modify |
1821 | * the mmap area beyond 1024 we will again get a page_fault and the | |
1822 | * page_mkwrite callback will do the block allocation and mark the | |
1823 | * buffer_heads mapped. | |
1824 | * | |
1825 | * We redirty the page if we have any buffer_heads that is either delay or | |
1826 | * unwritten in the page. | |
1827 | * | |
1828 | * We can get recursively called as show below. | |
1829 | * | |
1830 | * ext4_writepage() -> kmalloc() -> __alloc_pages() -> page_launder() -> | |
1831 | * ext4_writepage() | |
1832 | * | |
1833 | * But since we don't do any block allocation we should not deadlock. | |
1834 | * Page also have the dirty flag cleared so we don't get recurive page_lock. | |
61628a3f | 1835 | */ |
43ce1d23 | 1836 | static int ext4_writepage(struct page *page, |
62e086be | 1837 | struct writeback_control *wbc) |
64769240 | 1838 | { |
f8bec370 | 1839 | int ret = 0; |
61628a3f | 1840 | loff_t size; |
498e5f24 | 1841 | unsigned int len; |
744692dc | 1842 | struct buffer_head *page_bufs = NULL; |
61628a3f | 1843 | struct inode *inode = page->mapping->host; |
36ade451 | 1844 | struct ext4_io_submit io_submit; |
61628a3f | 1845 | |
a9c667f8 | 1846 | trace_ext4_writepage(page); |
f0e6c985 AK |
1847 | size = i_size_read(inode); |
1848 | if (page->index == size >> PAGE_CACHE_SHIFT) | |
1849 | len = size & ~PAGE_CACHE_MASK; | |
1850 | else | |
1851 | len = PAGE_CACHE_SIZE; | |
64769240 | 1852 | |
a42afc5f | 1853 | page_bufs = page_buffers(page); |
a42afc5f | 1854 | /* |
fe386132 JK |
1855 | * We cannot do block allocation or other extent handling in this |
1856 | * function. If there are buffers needing that, we have to redirty | |
1857 | * the page. But we may reach here when we do a journal commit via | |
1858 | * journal_submit_inode_data_buffers() and in that case we must write | |
1859 | * allocated buffers to achieve data=ordered mode guarantees. | |
a42afc5f | 1860 | */ |
f19d5870 TM |
1861 | if (ext4_walk_page_buffers(NULL, page_bufs, 0, len, NULL, |
1862 | ext4_bh_delay_or_unwritten)) { | |
f8bec370 | 1863 | redirty_page_for_writepage(wbc, page); |
fe386132 JK |
1864 | if (current->flags & PF_MEMALLOC) { |
1865 | /* | |
1866 | * For memory cleaning there's no point in writing only | |
1867 | * some buffers. So just bail out. Warn if we came here | |
1868 | * from direct reclaim. | |
1869 | */ | |
1870 | WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) | |
1871 | == PF_MEMALLOC); | |
f0e6c985 AK |
1872 | unlock_page(page); |
1873 | return 0; | |
1874 | } | |
a42afc5f | 1875 | } |
64769240 | 1876 | |
cb20d518 | 1877 | if (PageChecked(page) && ext4_should_journal_data(inode)) |
43ce1d23 AK |
1878 | /* |
1879 | * It's mmapped pagecache. Add buffers and journal it. There | |
1880 | * doesn't seem much point in redirtying the page here. | |
1881 | */ | |
3f0ca309 | 1882 | return __ext4_journalled_writepage(page, len); |
43ce1d23 | 1883 | |
97a851ed JK |
1884 | ext4_io_submit_init(&io_submit, wbc); |
1885 | io_submit.io_end = ext4_init_io_end(inode, GFP_NOFS); | |
1886 | if (!io_submit.io_end) { | |
1887 | redirty_page_for_writepage(wbc, page); | |
1888 | unlock_page(page); | |
1889 | return -ENOMEM; | |
1890 | } | |
36ade451 JK |
1891 | ret = ext4_bio_write_page(&io_submit, page, len, wbc); |
1892 | ext4_io_submit(&io_submit); | |
97a851ed JK |
1893 | /* Drop io_end reference we got from init */ |
1894 | ext4_put_io_end_defer(io_submit.io_end); | |
64769240 AT |
1895 | return ret; |
1896 | } | |
1897 | ||
5f1132b2 JK |
1898 | static int mpage_submit_page(struct mpage_da_data *mpd, struct page *page) |
1899 | { | |
1900 | int len; | |
1901 | loff_t size = i_size_read(mpd->inode); | |
1902 | int err; | |
1903 | ||
1904 | BUG_ON(page->index != mpd->first_page); | |
1905 | if (page->index == size >> PAGE_CACHE_SHIFT) | |
1906 | len = size & ~PAGE_CACHE_MASK; | |
1907 | else | |
1908 | len = PAGE_CACHE_SIZE; | |
1909 | clear_page_dirty_for_io(page); | |
1910 | err = ext4_bio_write_page(&mpd->io_submit, page, len, mpd->wbc); | |
1911 | if (!err) | |
1912 | mpd->wbc->nr_to_write--; | |
1913 | mpd->first_page++; | |
1914 | ||
1915 | return err; | |
1916 | } | |
1917 | ||
4e7ea81d JK |
1918 | #define BH_FLAGS ((1 << BH_Unwritten) | (1 << BH_Delay)) |
1919 | ||
61628a3f | 1920 | /* |
fffb2739 JK |
1921 | * mballoc gives us at most this number of blocks... |
1922 | * XXX: That seems to be only a limitation of ext4_mb_normalize_request(). | |
70261f56 | 1923 | * The rest of mballoc seems to handle chunks up to full group size. |
61628a3f | 1924 | */ |
fffb2739 | 1925 | #define MAX_WRITEPAGES_EXTENT_LEN 2048 |
525f4ed8 | 1926 | |
4e7ea81d JK |
1927 | /* |
1928 | * mpage_add_bh_to_extent - try to add bh to extent of blocks to map | |
1929 | * | |
1930 | * @mpd - extent of blocks | |
1931 | * @lblk - logical number of the block in the file | |
09930042 | 1932 | * @bh - buffer head we want to add to the extent |
4e7ea81d | 1933 | * |
09930042 JK |
1934 | * The function is used to collect contig. blocks in the same state. If the |
1935 | * buffer doesn't require mapping for writeback and we haven't started the | |
1936 | * extent of buffers to map yet, the function returns 'true' immediately - the | |
1937 | * caller can write the buffer right away. Otherwise the function returns true | |
1938 | * if the block has been added to the extent, false if the block couldn't be | |
1939 | * added. | |
4e7ea81d | 1940 | */ |
09930042 JK |
1941 | static bool mpage_add_bh_to_extent(struct mpage_da_data *mpd, ext4_lblk_t lblk, |
1942 | struct buffer_head *bh) | |
4e7ea81d JK |
1943 | { |
1944 | struct ext4_map_blocks *map = &mpd->map; | |
1945 | ||
09930042 JK |
1946 | /* Buffer that doesn't need mapping for writeback? */ |
1947 | if (!buffer_dirty(bh) || !buffer_mapped(bh) || | |
1948 | (!buffer_delay(bh) && !buffer_unwritten(bh))) { | |
1949 | /* So far no extent to map => we write the buffer right away */ | |
1950 | if (map->m_len == 0) | |
1951 | return true; | |
1952 | return false; | |
1953 | } | |
4e7ea81d JK |
1954 | |
1955 | /* First block in the extent? */ | |
1956 | if (map->m_len == 0) { | |
1957 | map->m_lblk = lblk; | |
1958 | map->m_len = 1; | |
09930042 JK |
1959 | map->m_flags = bh->b_state & BH_FLAGS; |
1960 | return true; | |
4e7ea81d JK |
1961 | } |
1962 | ||
09930042 JK |
1963 | /* Don't go larger than mballoc is willing to allocate */ |
1964 | if (map->m_len >= MAX_WRITEPAGES_EXTENT_LEN) | |
1965 | return false; | |
1966 | ||
4e7ea81d JK |
1967 | /* Can we merge the block to our big extent? */ |
1968 | if (lblk == map->m_lblk + map->m_len && | |
09930042 | 1969 | (bh->b_state & BH_FLAGS) == map->m_flags) { |
4e7ea81d | 1970 | map->m_len++; |
09930042 | 1971 | return true; |
4e7ea81d | 1972 | } |
09930042 | 1973 | return false; |
4e7ea81d JK |
1974 | } |
1975 | ||
5f1132b2 JK |
1976 | /* |
1977 | * mpage_process_page_bufs - submit page buffers for IO or add them to extent | |
1978 | * | |
1979 | * @mpd - extent of blocks for mapping | |
1980 | * @head - the first buffer in the page | |
1981 | * @bh - buffer we should start processing from | |
1982 | * @lblk - logical number of the block in the file corresponding to @bh | |
1983 | * | |
1984 | * Walk through page buffers from @bh upto @head (exclusive) and either submit | |
1985 | * the page for IO if all buffers in this page were mapped and there's no | |
1986 | * accumulated extent of buffers to map or add buffers in the page to the | |
1987 | * extent of buffers to map. The function returns 1 if the caller can continue | |
1988 | * by processing the next page, 0 if it should stop adding buffers to the | |
1989 | * extent to map because we cannot extend it anymore. It can also return value | |
1990 | * < 0 in case of error during IO submission. | |
1991 | */ | |
1992 | static int mpage_process_page_bufs(struct mpage_da_data *mpd, | |
1993 | struct buffer_head *head, | |
1994 | struct buffer_head *bh, | |
1995 | ext4_lblk_t lblk) | |
4e7ea81d JK |
1996 | { |
1997 | struct inode *inode = mpd->inode; | |
5f1132b2 | 1998 | int err; |
4e7ea81d JK |
1999 | ext4_lblk_t blocks = (i_size_read(inode) + (1 << inode->i_blkbits) - 1) |
2000 | >> inode->i_blkbits; | |
2001 | ||
2002 | do { | |
2003 | BUG_ON(buffer_locked(bh)); | |
2004 | ||
09930042 | 2005 | if (lblk >= blocks || !mpage_add_bh_to_extent(mpd, lblk, bh)) { |
4e7ea81d JK |
2006 | /* Found extent to map? */ |
2007 | if (mpd->map.m_len) | |
5f1132b2 | 2008 | return 0; |
09930042 | 2009 | /* Everything mapped so far and we hit EOF */ |
5f1132b2 | 2010 | break; |
4e7ea81d | 2011 | } |
4e7ea81d | 2012 | } while (lblk++, (bh = bh->b_this_page) != head); |
5f1132b2 JK |
2013 | /* So far everything mapped? Submit the page for IO. */ |
2014 | if (mpd->map.m_len == 0) { | |
2015 | err = mpage_submit_page(mpd, head->b_page); | |
2016 | if (err < 0) | |
2017 | return err; | |
2018 | } | |
2019 | return lblk < blocks; | |
4e7ea81d JK |
2020 | } |
2021 | ||
2022 | /* | |
2023 | * mpage_map_buffers - update buffers corresponding to changed extent and | |
2024 | * submit fully mapped pages for IO | |
2025 | * | |
2026 | * @mpd - description of extent to map, on return next extent to map | |
2027 | * | |
2028 | * Scan buffers corresponding to changed extent (we expect corresponding pages | |
2029 | * to be already locked) and update buffer state according to new extent state. | |
2030 | * We map delalloc buffers to their physical location, clear unwritten bits, | |
2031 | * and mark buffers as uninit when we perform writes to uninitialized extents | |
2032 | * and do extent conversion after IO is finished. If the last page is not fully | |
2033 | * mapped, we update @map to the next extent in the last page that needs | |
2034 | * mapping. Otherwise we submit the page for IO. | |
2035 | */ | |
2036 | static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd) | |
2037 | { | |
2038 | struct pagevec pvec; | |
2039 | int nr_pages, i; | |
2040 | struct inode *inode = mpd->inode; | |
2041 | struct buffer_head *head, *bh; | |
2042 | int bpp_bits = PAGE_CACHE_SHIFT - inode->i_blkbits; | |
4e7ea81d JK |
2043 | pgoff_t start, end; |
2044 | ext4_lblk_t lblk; | |
2045 | sector_t pblock; | |
2046 | int err; | |
2047 | ||
2048 | start = mpd->map.m_lblk >> bpp_bits; | |
2049 | end = (mpd->map.m_lblk + mpd->map.m_len - 1) >> bpp_bits; | |
2050 | lblk = start << bpp_bits; | |
2051 | pblock = mpd->map.m_pblk; | |
2052 | ||
2053 | pagevec_init(&pvec, 0); | |
2054 | while (start <= end) { | |
2055 | nr_pages = pagevec_lookup(&pvec, inode->i_mapping, start, | |
2056 | PAGEVEC_SIZE); | |
2057 | if (nr_pages == 0) | |
2058 | break; | |
2059 | for (i = 0; i < nr_pages; i++) { | |
2060 | struct page *page = pvec.pages[i]; | |
2061 | ||
2062 | if (page->index > end) | |
2063 | break; | |
70261f56 | 2064 | /* Up to 'end' pages must be contiguous */ |
4e7ea81d JK |
2065 | BUG_ON(page->index != start); |
2066 | bh = head = page_buffers(page); | |
2067 | do { | |
2068 | if (lblk < mpd->map.m_lblk) | |
2069 | continue; | |
2070 | if (lblk >= mpd->map.m_lblk + mpd->map.m_len) { | |
2071 | /* | |
2072 | * Buffer after end of mapped extent. | |
2073 | * Find next buffer in the page to map. | |
2074 | */ | |
2075 | mpd->map.m_len = 0; | |
2076 | mpd->map.m_flags = 0; | |
5f1132b2 JK |
2077 | /* |
2078 | * FIXME: If dioread_nolock supports | |
2079 | * blocksize < pagesize, we need to make | |
2080 | * sure we add size mapped so far to | |
2081 | * io_end->size as the following call | |
2082 | * can submit the page for IO. | |
2083 | */ | |
2084 | err = mpage_process_page_bufs(mpd, head, | |
2085 | bh, lblk); | |
4e7ea81d | 2086 | pagevec_release(&pvec); |
5f1132b2 JK |
2087 | if (err > 0) |
2088 | err = 0; | |
2089 | return err; | |
4e7ea81d JK |
2090 | } |
2091 | if (buffer_delay(bh)) { | |
2092 | clear_buffer_delay(bh); | |
2093 | bh->b_blocknr = pblock++; | |
2094 | } | |
4e7ea81d | 2095 | clear_buffer_unwritten(bh); |
5f1132b2 | 2096 | } while (lblk++, (bh = bh->b_this_page) != head); |
4e7ea81d JK |
2097 | |
2098 | /* | |
2099 | * FIXME: This is going to break if dioread_nolock | |
2100 | * supports blocksize < pagesize as we will try to | |
2101 | * convert potentially unmapped parts of inode. | |
2102 | */ | |
2103 | mpd->io_submit.io_end->size += PAGE_CACHE_SIZE; | |
2104 | /* Page fully mapped - let IO run! */ | |
2105 | err = mpage_submit_page(mpd, page); | |
2106 | if (err < 0) { | |
2107 | pagevec_release(&pvec); | |
2108 | return err; | |
2109 | } | |
2110 | start++; | |
2111 | } | |
2112 | pagevec_release(&pvec); | |
2113 | } | |
2114 | /* Extent fully mapped and matches with page boundary. We are done. */ | |
2115 | mpd->map.m_len = 0; | |
2116 | mpd->map.m_flags = 0; | |
2117 | return 0; | |
2118 | } | |
2119 | ||
2120 | static int mpage_map_one_extent(handle_t *handle, struct mpage_da_data *mpd) | |
2121 | { | |
2122 | struct inode *inode = mpd->inode; | |
2123 | struct ext4_map_blocks *map = &mpd->map; | |
2124 | int get_blocks_flags; | |
2125 | int err; | |
2126 | ||
2127 | trace_ext4_da_write_pages_extent(inode, map); | |
2128 | /* | |
2129 | * Call ext4_map_blocks() to allocate any delayed allocation blocks, or | |
2130 | * to convert an uninitialized extent to be initialized (in the case | |
2131 | * where we have written into one or more preallocated blocks). It is | |
2132 | * possible that we're going to need more metadata blocks than | |
2133 | * previously reserved. However we must not fail because we're in | |
2134 | * writeback and there is nothing we can do about it so it might result | |
2135 | * in data loss. So use reserved blocks to allocate metadata if | |
2136 | * possible. | |
2137 | * | |
2138 | * We pass in the magic EXT4_GET_BLOCKS_DELALLOC_RESERVE if the blocks | |
2139 | * in question are delalloc blocks. This affects functions in many | |
2140 | * different parts of the allocation call path. This flag exists | |
2141 | * primarily because we don't want to change *many* call functions, so | |
2142 | * ext4_map_blocks() will set the EXT4_STATE_DELALLOC_RESERVED flag | |
2143 | * once the inode's allocation semaphore is taken. | |
2144 | */ | |
2145 | get_blocks_flags = EXT4_GET_BLOCKS_CREATE | | |
2146 | EXT4_GET_BLOCKS_METADATA_NOFAIL; | |
2147 | if (ext4_should_dioread_nolock(inode)) | |
2148 | get_blocks_flags |= EXT4_GET_BLOCKS_IO_CREATE_EXT; | |
2149 | if (map->m_flags & (1 << BH_Delay)) | |
2150 | get_blocks_flags |= EXT4_GET_BLOCKS_DELALLOC_RESERVE; | |
2151 | ||
2152 | err = ext4_map_blocks(handle, inode, map, get_blocks_flags); | |
2153 | if (err < 0) | |
2154 | return err; | |
6b523df4 JK |
2155 | if (map->m_flags & EXT4_MAP_UNINIT) { |
2156 | if (!mpd->io_submit.io_end->handle && | |
2157 | ext4_handle_valid(handle)) { | |
2158 | mpd->io_submit.io_end->handle = handle->h_rsv_handle; | |
2159 | handle->h_rsv_handle = NULL; | |
2160 | } | |
3613d228 | 2161 | ext4_set_io_unwritten_flag(inode, mpd->io_submit.io_end); |
6b523df4 | 2162 | } |
4e7ea81d JK |
2163 | |
2164 | BUG_ON(map->m_len == 0); | |
2165 | if (map->m_flags & EXT4_MAP_NEW) { | |
2166 | struct block_device *bdev = inode->i_sb->s_bdev; | |
2167 | int i; | |
2168 | ||
2169 | for (i = 0; i < map->m_len; i++) | |
2170 | unmap_underlying_metadata(bdev, map->m_pblk + i); | |
2171 | } | |
2172 | return 0; | |
2173 | } | |
2174 | ||
2175 | /* | |
2176 | * mpage_map_and_submit_extent - map extent starting at mpd->lblk of length | |
2177 | * mpd->len and submit pages underlying it for IO | |
2178 | * | |
2179 | * @handle - handle for journal operations | |
2180 | * @mpd - extent to map | |
2181 | * | |
2182 | * The function maps extent starting at mpd->lblk of length mpd->len. If it is | |
2183 | * delayed, blocks are allocated, if it is unwritten, we may need to convert | |
2184 | * them to initialized or split the described range from larger unwritten | |
2185 | * extent. Note that we need not map all the described range since allocation | |
2186 | * can return less blocks or the range is covered by more unwritten extents. We | |
2187 | * cannot map more because we are limited by reserved transaction credits. On | |
2188 | * the other hand we always make sure that the last touched page is fully | |
2189 | * mapped so that it can be written out (and thus forward progress is | |
2190 | * guaranteed). After mapping we submit all mapped pages for IO. | |
2191 | */ | |
2192 | static int mpage_map_and_submit_extent(handle_t *handle, | |
cb530541 TT |
2193 | struct mpage_da_data *mpd, |
2194 | bool *give_up_on_write) | |
4e7ea81d JK |
2195 | { |
2196 | struct inode *inode = mpd->inode; | |
2197 | struct ext4_map_blocks *map = &mpd->map; | |
2198 | int err; | |
2199 | loff_t disksize; | |
2200 | ||
2201 | mpd->io_submit.io_end->offset = | |
2202 | ((loff_t)map->m_lblk) << inode->i_blkbits; | |
27d7c4ed | 2203 | do { |
4e7ea81d JK |
2204 | err = mpage_map_one_extent(handle, mpd); |
2205 | if (err < 0) { | |
2206 | struct super_block *sb = inode->i_sb; | |
2207 | ||
cb530541 TT |
2208 | if (EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED) |
2209 | goto invalidate_dirty_pages; | |
4e7ea81d | 2210 | /* |
cb530541 TT |
2211 | * Let the uper layers retry transient errors. |
2212 | * In the case of ENOSPC, if ext4_count_free_blocks() | |
2213 | * is non-zero, a commit should free up blocks. | |
4e7ea81d | 2214 | */ |
cb530541 TT |
2215 | if ((err == -ENOMEM) || |
2216 | (err == -ENOSPC && ext4_count_free_clusters(sb))) | |
2217 | return err; | |
2218 | ext4_msg(sb, KERN_CRIT, | |
2219 | "Delayed block allocation failed for " | |
2220 | "inode %lu at logical offset %llu with" | |
2221 | " max blocks %u with error %d", | |
2222 | inode->i_ino, | |
2223 | (unsigned long long)map->m_lblk, | |
2224 | (unsigned)map->m_len, -err); | |
2225 | ext4_msg(sb, KERN_CRIT, | |
2226 | "This should not happen!! Data will " | |
2227 | "be lost\n"); | |
2228 | if (err == -ENOSPC) | |
2229 | ext4_print_free_blocks(inode); | |
2230 | invalidate_dirty_pages: | |
2231 | *give_up_on_write = true; | |
4e7ea81d JK |
2232 | return err; |
2233 | } | |
2234 | /* | |
2235 | * Update buffer state, submit mapped pages, and get us new | |
2236 | * extent to map | |
2237 | */ | |
2238 | err = mpage_map_and_submit_buffers(mpd); | |
2239 | if (err < 0) | |
2240 | return err; | |
27d7c4ed | 2241 | } while (map->m_len); |
4e7ea81d JK |
2242 | |
2243 | /* Update on-disk size after IO is submitted */ | |
2244 | disksize = ((loff_t)mpd->first_page) << PAGE_CACHE_SHIFT; | |
4e7ea81d JK |
2245 | if (disksize > EXT4_I(inode)->i_disksize) { |
2246 | int err2; | |
2247 | ||
90e775b7 | 2248 | ext4_wb_update_i_disksize(inode, disksize); |
4e7ea81d JK |
2249 | err2 = ext4_mark_inode_dirty(handle, inode); |
2250 | if (err2) | |
2251 | ext4_error(inode->i_sb, | |
2252 | "Failed to mark inode %lu dirty", | |
2253 | inode->i_ino); | |
2254 | if (!err) | |
2255 | err = err2; | |
2256 | } | |
2257 | return err; | |
2258 | } | |
2259 | ||
fffb2739 JK |
2260 | /* |
2261 | * Calculate the total number of credits to reserve for one writepages | |
20970ba6 | 2262 | * iteration. This is called from ext4_writepages(). We map an extent of |
70261f56 | 2263 | * up to MAX_WRITEPAGES_EXTENT_LEN blocks and then we go on and finish mapping |
fffb2739 JK |
2264 | * the last partial page. So in total we can map MAX_WRITEPAGES_EXTENT_LEN + |
2265 | * bpp - 1 blocks in bpp different extents. | |
2266 | */ | |
525f4ed8 MC |
2267 | static int ext4_da_writepages_trans_blocks(struct inode *inode) |
2268 | { | |
fffb2739 | 2269 | int bpp = ext4_journal_blocks_per_page(inode); |
525f4ed8 | 2270 | |
fffb2739 JK |
2271 | return ext4_meta_trans_blocks(inode, |
2272 | MAX_WRITEPAGES_EXTENT_LEN + bpp - 1, bpp); | |
525f4ed8 | 2273 | } |
61628a3f | 2274 | |
8e48dcfb | 2275 | /* |
4e7ea81d JK |
2276 | * mpage_prepare_extent_to_map - find & lock contiguous range of dirty pages |
2277 | * and underlying extent to map | |
2278 | * | |
2279 | * @mpd - where to look for pages | |
2280 | * | |
2281 | * Walk dirty pages in the mapping. If they are fully mapped, submit them for | |
2282 | * IO immediately. When we find a page which isn't mapped we start accumulating | |
2283 | * extent of buffers underlying these pages that needs mapping (formed by | |
2284 | * either delayed or unwritten buffers). We also lock the pages containing | |
2285 | * these buffers. The extent found is returned in @mpd structure (starting at | |
2286 | * mpd->lblk with length mpd->len blocks). | |
2287 | * | |
2288 | * Note that this function can attach bios to one io_end structure which are | |
2289 | * neither logically nor physically contiguous. Although it may seem as an | |
2290 | * unnecessary complication, it is actually inevitable in blocksize < pagesize | |
2291 | * case as we need to track IO to all buffers underlying a page in one io_end. | |
8e48dcfb | 2292 | */ |
4e7ea81d | 2293 | static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd) |
8e48dcfb | 2294 | { |
4e7ea81d JK |
2295 | struct address_space *mapping = mpd->inode->i_mapping; |
2296 | struct pagevec pvec; | |
2297 | unsigned int nr_pages; | |
2298 | pgoff_t index = mpd->first_page; | |
2299 | pgoff_t end = mpd->last_page; | |
2300 | int tag; | |
2301 | int i, err = 0; | |
2302 | int blkbits = mpd->inode->i_blkbits; | |
2303 | ext4_lblk_t lblk; | |
2304 | struct buffer_head *head; | |
8e48dcfb | 2305 | |
4e7ea81d | 2306 | if (mpd->wbc->sync_mode == WB_SYNC_ALL || mpd->wbc->tagged_writepages) |
5b41d924 ES |
2307 | tag = PAGECACHE_TAG_TOWRITE; |
2308 | else | |
2309 | tag = PAGECACHE_TAG_DIRTY; | |
2310 | ||
4e7ea81d JK |
2311 | pagevec_init(&pvec, 0); |
2312 | mpd->map.m_len = 0; | |
2313 | mpd->next_page = index; | |
4f01b02c | 2314 | while (index <= end) { |
5b41d924 | 2315 | nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
8e48dcfb TT |
2316 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1); |
2317 | if (nr_pages == 0) | |
4e7ea81d | 2318 | goto out; |
8e48dcfb TT |
2319 | |
2320 | for (i = 0; i < nr_pages; i++) { | |
2321 | struct page *page = pvec.pages[i]; | |
2322 | ||
2323 | /* | |
2324 | * At this point, the page may be truncated or | |
2325 | * invalidated (changing page->mapping to NULL), or | |
2326 | * even swizzled back from swapper_space to tmpfs file | |
2327 | * mapping. However, page->index will not change | |
2328 | * because we have a reference on the page. | |
2329 | */ | |
4f01b02c TT |
2330 | if (page->index > end) |
2331 | goto out; | |
8e48dcfb | 2332 | |
4e7ea81d JK |
2333 | /* If we can't merge this page, we are done. */ |
2334 | if (mpd->map.m_len > 0 && mpd->next_page != page->index) | |
2335 | goto out; | |
78aaced3 | 2336 | |
8e48dcfb | 2337 | lock_page(page); |
8e48dcfb | 2338 | /* |
4e7ea81d JK |
2339 | * If the page is no longer dirty, or its mapping no |
2340 | * longer corresponds to inode we are writing (which | |
2341 | * means it has been truncated or invalidated), or the | |
2342 | * page is already under writeback and we are not doing | |
2343 | * a data integrity writeback, skip the page | |
8e48dcfb | 2344 | */ |
4f01b02c TT |
2345 | if (!PageDirty(page) || |
2346 | (PageWriteback(page) && | |
4e7ea81d | 2347 | (mpd->wbc->sync_mode == WB_SYNC_NONE)) || |
4f01b02c | 2348 | unlikely(page->mapping != mapping)) { |
8e48dcfb TT |
2349 | unlock_page(page); |
2350 | continue; | |
2351 | } | |
2352 | ||
7cb1a535 | 2353 | wait_on_page_writeback(page); |
8e48dcfb | 2354 | BUG_ON(PageWriteback(page)); |
8e48dcfb | 2355 | |
4e7ea81d | 2356 | if (mpd->map.m_len == 0) |
8eb9e5ce | 2357 | mpd->first_page = page->index; |
8eb9e5ce | 2358 | mpd->next_page = page->index + 1; |
f8bec370 | 2359 | /* Add all dirty buffers to mpd */ |
4e7ea81d JK |
2360 | lblk = ((ext4_lblk_t)page->index) << |
2361 | (PAGE_CACHE_SHIFT - blkbits); | |
f8bec370 | 2362 | head = page_buffers(page); |
5f1132b2 JK |
2363 | err = mpage_process_page_bufs(mpd, head, head, lblk); |
2364 | if (err <= 0) | |
4e7ea81d | 2365 | goto out; |
5f1132b2 | 2366 | err = 0; |
4e7ea81d JK |
2367 | |
2368 | /* | |
2369 | * Accumulated enough dirty pages? This doesn't apply | |
2370 | * to WB_SYNC_ALL mode. For integrity sync we have to | |
2371 | * keep going because someone may be concurrently | |
2372 | * dirtying pages, and we might have synced a lot of | |
2373 | * newly appeared dirty pages, but have not synced all | |
2374 | * of the old dirty pages. | |
2375 | */ | |
2376 | if (mpd->wbc->sync_mode == WB_SYNC_NONE && | |
2377 | mpd->next_page - mpd->first_page >= | |
2378 | mpd->wbc->nr_to_write) | |
2379 | goto out; | |
8e48dcfb TT |
2380 | } |
2381 | pagevec_release(&pvec); | |
2382 | cond_resched(); | |
2383 | } | |
4f01b02c | 2384 | return 0; |
8eb9e5ce TT |
2385 | out: |
2386 | pagevec_release(&pvec); | |
4e7ea81d | 2387 | return err; |
8e48dcfb TT |
2388 | } |
2389 | ||
20970ba6 TT |
2390 | static int __writepage(struct page *page, struct writeback_control *wbc, |
2391 | void *data) | |
2392 | { | |
2393 | struct address_space *mapping = data; | |
2394 | int ret = ext4_writepage(page, wbc); | |
2395 | mapping_set_error(mapping, ret); | |
2396 | return ret; | |
2397 | } | |
2398 | ||
2399 | static int ext4_writepages(struct address_space *mapping, | |
2400 | struct writeback_control *wbc) | |
64769240 | 2401 | { |
4e7ea81d JK |
2402 | pgoff_t writeback_index = 0; |
2403 | long nr_to_write = wbc->nr_to_write; | |
22208ded | 2404 | int range_whole = 0; |
4e7ea81d | 2405 | int cycled = 1; |
61628a3f | 2406 | handle_t *handle = NULL; |
df22291f | 2407 | struct mpage_da_data mpd; |
5e745b04 | 2408 | struct inode *inode = mapping->host; |
6b523df4 | 2409 | int needed_blocks, rsv_blocks = 0, ret = 0; |
5e745b04 | 2410 | struct ext4_sb_info *sbi = EXT4_SB(mapping->host->i_sb); |
4e7ea81d | 2411 | bool done; |
1bce63d1 | 2412 | struct blk_plug plug; |
cb530541 | 2413 | bool give_up_on_write = false; |
61628a3f | 2414 | |
20970ba6 | 2415 | trace_ext4_writepages(inode, wbc); |
ba80b101 | 2416 | |
61628a3f MC |
2417 | /* |
2418 | * No pages to write? This is mainly a kludge to avoid starting | |
2419 | * a transaction for special inodes like journal inode on last iput() | |
2420 | * because that could violate lock ordering on umount | |
2421 | */ | |
a1d6cc56 | 2422 | if (!mapping->nrpages || !mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) |
61628a3f | 2423 | return 0; |
2a21e37e | 2424 | |
20970ba6 TT |
2425 | if (ext4_should_journal_data(inode)) { |
2426 | struct blk_plug plug; | |
2427 | int ret; | |
2428 | ||
2429 | blk_start_plug(&plug); | |
2430 | ret = write_cache_pages(mapping, wbc, __writepage, mapping); | |
2431 | blk_finish_plug(&plug); | |
2432 | return ret; | |
2433 | } | |
2434 | ||
2a21e37e TT |
2435 | /* |
2436 | * If the filesystem has aborted, it is read-only, so return | |
2437 | * right away instead of dumping stack traces later on that | |
2438 | * will obscure the real source of the problem. We test | |
4ab2f15b | 2439 | * EXT4_MF_FS_ABORTED instead of sb->s_flag's MS_RDONLY because |
2a21e37e | 2440 | * the latter could be true if the filesystem is mounted |
20970ba6 | 2441 | * read-only, and in that case, ext4_writepages should |
2a21e37e TT |
2442 | * *never* be called, so if that ever happens, we would want |
2443 | * the stack trace. | |
2444 | */ | |
4ab2f15b | 2445 | if (unlikely(sbi->s_mount_flags & EXT4_MF_FS_ABORTED)) |
2a21e37e TT |
2446 | return -EROFS; |
2447 | ||
6b523df4 JK |
2448 | if (ext4_should_dioread_nolock(inode)) { |
2449 | /* | |
70261f56 | 2450 | * We may need to convert up to one extent per block in |
6b523df4 JK |
2451 | * the page and we may dirty the inode. |
2452 | */ | |
2453 | rsv_blocks = 1 + (PAGE_CACHE_SIZE >> inode->i_blkbits); | |
2454 | } | |
2455 | ||
4e7ea81d JK |
2456 | /* |
2457 | * If we have inline data and arrive here, it means that | |
2458 | * we will soon create the block for the 1st page, so | |
2459 | * we'd better clear the inline data here. | |
2460 | */ | |
2461 | if (ext4_has_inline_data(inode)) { | |
2462 | /* Just inode will be modified... */ | |
2463 | handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); | |
2464 | if (IS_ERR(handle)) { | |
2465 | ret = PTR_ERR(handle); | |
2466 | goto out_writepages; | |
2467 | } | |
2468 | BUG_ON(ext4_test_inode_state(inode, | |
2469 | EXT4_STATE_MAY_INLINE_DATA)); | |
2470 | ext4_destroy_inline_data(handle, inode); | |
2471 | ext4_journal_stop(handle); | |
2472 | } | |
2473 | ||
22208ded AK |
2474 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
2475 | range_whole = 1; | |
61628a3f | 2476 | |
2acf2c26 | 2477 | if (wbc->range_cyclic) { |
4e7ea81d JK |
2478 | writeback_index = mapping->writeback_index; |
2479 | if (writeback_index) | |
2acf2c26 | 2480 | cycled = 0; |
4e7ea81d JK |
2481 | mpd.first_page = writeback_index; |
2482 | mpd.last_page = -1; | |
5b41d924 | 2483 | } else { |
4e7ea81d JK |
2484 | mpd.first_page = wbc->range_start >> PAGE_CACHE_SHIFT; |
2485 | mpd.last_page = wbc->range_end >> PAGE_CACHE_SHIFT; | |
5b41d924 | 2486 | } |
a1d6cc56 | 2487 | |
4e7ea81d JK |
2488 | mpd.inode = inode; |
2489 | mpd.wbc = wbc; | |
2490 | ext4_io_submit_init(&mpd.io_submit, wbc); | |
2acf2c26 | 2491 | retry: |
6e6938b6 | 2492 | if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) |
4e7ea81d JK |
2493 | tag_pages_for_writeback(mapping, mpd.first_page, mpd.last_page); |
2494 | done = false; | |
1bce63d1 | 2495 | blk_start_plug(&plug); |
4e7ea81d JK |
2496 | while (!done && mpd.first_page <= mpd.last_page) { |
2497 | /* For each extent of pages we use new io_end */ | |
2498 | mpd.io_submit.io_end = ext4_init_io_end(inode, GFP_KERNEL); | |
2499 | if (!mpd.io_submit.io_end) { | |
2500 | ret = -ENOMEM; | |
2501 | break; | |
2502 | } | |
a1d6cc56 AK |
2503 | |
2504 | /* | |
4e7ea81d JK |
2505 | * We have two constraints: We find one extent to map and we |
2506 | * must always write out whole page (makes a difference when | |
2507 | * blocksize < pagesize) so that we don't block on IO when we | |
2508 | * try to write out the rest of the page. Journalled mode is | |
2509 | * not supported by delalloc. | |
a1d6cc56 AK |
2510 | */ |
2511 | BUG_ON(ext4_should_journal_data(inode)); | |
525f4ed8 | 2512 | needed_blocks = ext4_da_writepages_trans_blocks(inode); |
a1d6cc56 | 2513 | |
4e7ea81d | 2514 | /* start a new transaction */ |
6b523df4 JK |
2515 | handle = ext4_journal_start_with_reserve(inode, |
2516 | EXT4_HT_WRITE_PAGE, needed_blocks, rsv_blocks); | |
61628a3f MC |
2517 | if (IS_ERR(handle)) { |
2518 | ret = PTR_ERR(handle); | |
1693918e | 2519 | ext4_msg(inode->i_sb, KERN_CRIT, "%s: jbd2_start: " |
fbe845dd | 2520 | "%ld pages, ino %lu; err %d", __func__, |
a1d6cc56 | 2521 | wbc->nr_to_write, inode->i_ino, ret); |
4e7ea81d JK |
2522 | /* Release allocated io_end */ |
2523 | ext4_put_io_end(mpd.io_submit.io_end); | |
2524 | break; | |
61628a3f | 2525 | } |
f63e6005 | 2526 | |
4e7ea81d JK |
2527 | trace_ext4_da_write_pages(inode, mpd.first_page, mpd.wbc); |
2528 | ret = mpage_prepare_extent_to_map(&mpd); | |
2529 | if (!ret) { | |
2530 | if (mpd.map.m_len) | |
cb530541 TT |
2531 | ret = mpage_map_and_submit_extent(handle, &mpd, |
2532 | &give_up_on_write); | |
4e7ea81d JK |
2533 | else { |
2534 | /* | |
2535 | * We scanned the whole range (or exhausted | |
2536 | * nr_to_write), submitted what was mapped and | |
2537 | * didn't find anything needing mapping. We are | |
2538 | * done. | |
2539 | */ | |
2540 | done = true; | |
2541 | } | |
f63e6005 | 2542 | } |
61628a3f | 2543 | ext4_journal_stop(handle); |
4e7ea81d JK |
2544 | /* Submit prepared bio */ |
2545 | ext4_io_submit(&mpd.io_submit); | |
2546 | /* Unlock pages we didn't use */ | |
cb530541 | 2547 | mpage_release_unused_pages(&mpd, give_up_on_write); |
4e7ea81d JK |
2548 | /* Drop our io_end reference we got from init */ |
2549 | ext4_put_io_end(mpd.io_submit.io_end); | |
2550 | ||
2551 | if (ret == -ENOSPC && sbi->s_journal) { | |
2552 | /* | |
2553 | * Commit the transaction which would | |
22208ded AK |
2554 | * free blocks released in the transaction |
2555 | * and try again | |
2556 | */ | |
df22291f | 2557 | jbd2_journal_force_commit_nested(sbi->s_journal); |
22208ded | 2558 | ret = 0; |
4e7ea81d JK |
2559 | continue; |
2560 | } | |
2561 | /* Fatal error - ENOMEM, EIO... */ | |
2562 | if (ret) | |
61628a3f | 2563 | break; |
a1d6cc56 | 2564 | } |
1bce63d1 | 2565 | blk_finish_plug(&plug); |
9c12a831 | 2566 | if (!ret && !cycled && wbc->nr_to_write > 0) { |
2acf2c26 | 2567 | cycled = 1; |
4e7ea81d JK |
2568 | mpd.last_page = writeback_index - 1; |
2569 | mpd.first_page = 0; | |
2acf2c26 AK |
2570 | goto retry; |
2571 | } | |
22208ded AK |
2572 | |
2573 | /* Update index */ | |
22208ded AK |
2574 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
2575 | /* | |
4e7ea81d | 2576 | * Set the writeback_index so that range_cyclic |
22208ded AK |
2577 | * mode will write it back later |
2578 | */ | |
4e7ea81d | 2579 | mapping->writeback_index = mpd.first_page; |
a1d6cc56 | 2580 | |
61628a3f | 2581 | out_writepages: |
20970ba6 TT |
2582 | trace_ext4_writepages_result(inode, wbc, ret, |
2583 | nr_to_write - wbc->nr_to_write); | |
61628a3f | 2584 | return ret; |
64769240 AT |
2585 | } |
2586 | ||
79f0be8d AK |
2587 | static int ext4_nonda_switch(struct super_block *sb) |
2588 | { | |
5c1ff336 | 2589 | s64 free_clusters, dirty_clusters; |
79f0be8d AK |
2590 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
2591 | ||
2592 | /* | |
2593 | * switch to non delalloc mode if we are running low | |
2594 | * on free block. The free block accounting via percpu | |
179f7ebf | 2595 | * counters can get slightly wrong with percpu_counter_batch getting |
79f0be8d AK |
2596 | * accumulated on each CPU without updating global counters |
2597 | * Delalloc need an accurate free block accounting. So switch | |
2598 | * to non delalloc when we are near to error range. | |
2599 | */ | |
5c1ff336 EW |
2600 | free_clusters = |
2601 | percpu_counter_read_positive(&sbi->s_freeclusters_counter); | |
2602 | dirty_clusters = | |
2603 | percpu_counter_read_positive(&sbi->s_dirtyclusters_counter); | |
00d4e736 TT |
2604 | /* |
2605 | * Start pushing delalloc when 1/2 of free blocks are dirty. | |
2606 | */ | |
5c1ff336 | 2607 | if (dirty_clusters && (free_clusters < 2 * dirty_clusters)) |
10ee27a0 | 2608 | try_to_writeback_inodes_sb(sb, WB_REASON_FS_FREE_SPACE); |
00d4e736 | 2609 | |
5c1ff336 EW |
2610 | if (2 * free_clusters < 3 * dirty_clusters || |
2611 | free_clusters < (dirty_clusters + EXT4_FREECLUSTERS_WATERMARK)) { | |
79f0be8d | 2612 | /* |
c8afb446 ES |
2613 | * free block count is less than 150% of dirty blocks |
2614 | * or free blocks is less than watermark | |
79f0be8d AK |
2615 | */ |
2616 | return 1; | |
2617 | } | |
2618 | return 0; | |
2619 | } | |
2620 | ||
64769240 | 2621 | static int ext4_da_write_begin(struct file *file, struct address_space *mapping, |
de9a55b8 TT |
2622 | loff_t pos, unsigned len, unsigned flags, |
2623 | struct page **pagep, void **fsdata) | |
64769240 | 2624 | { |
72b8ab9d | 2625 | int ret, retries = 0; |
64769240 AT |
2626 | struct page *page; |
2627 | pgoff_t index; | |
64769240 AT |
2628 | struct inode *inode = mapping->host; |
2629 | handle_t *handle; | |
2630 | ||
2631 | index = pos >> PAGE_CACHE_SHIFT; | |
79f0be8d AK |
2632 | |
2633 | if (ext4_nonda_switch(inode->i_sb)) { | |
2634 | *fsdata = (void *)FALL_BACK_TO_NONDELALLOC; | |
2635 | return ext4_write_begin(file, mapping, pos, | |
2636 | len, flags, pagep, fsdata); | |
2637 | } | |
2638 | *fsdata = (void *)0; | |
9bffad1e | 2639 | trace_ext4_da_write_begin(inode, pos, len, flags); |
9c3569b5 TM |
2640 | |
2641 | if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) { | |
2642 | ret = ext4_da_write_inline_data_begin(mapping, inode, | |
2643 | pos, len, flags, | |
2644 | pagep, fsdata); | |
2645 | if (ret < 0) | |
47564bfb TT |
2646 | return ret; |
2647 | if (ret == 1) | |
2648 | return 0; | |
9c3569b5 TM |
2649 | } |
2650 | ||
47564bfb TT |
2651 | /* |
2652 | * grab_cache_page_write_begin() can take a long time if the | |
2653 | * system is thrashing due to memory pressure, or if the page | |
2654 | * is being written back. So grab it first before we start | |
2655 | * the transaction handle. This also allows us to allocate | |
2656 | * the page (if needed) without using GFP_NOFS. | |
2657 | */ | |
2658 | retry_grab: | |
2659 | page = grab_cache_page_write_begin(mapping, index, flags); | |
2660 | if (!page) | |
2661 | return -ENOMEM; | |
2662 | unlock_page(page); | |
2663 | ||
64769240 AT |
2664 | /* |
2665 | * With delayed allocation, we don't log the i_disksize update | |
2666 | * if there is delayed block allocation. But we still need | |
2667 | * to journalling the i_disksize update if writes to the end | |
2668 | * of file which has an already mapped buffer. | |
2669 | */ | |
47564bfb | 2670 | retry_journal: |
9924a92a | 2671 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, 1); |
64769240 | 2672 | if (IS_ERR(handle)) { |
47564bfb TT |
2673 | page_cache_release(page); |
2674 | return PTR_ERR(handle); | |
64769240 AT |
2675 | } |
2676 | ||
47564bfb TT |
2677 | lock_page(page); |
2678 | if (page->mapping != mapping) { | |
2679 | /* The page got truncated from under us */ | |
2680 | unlock_page(page); | |
2681 | page_cache_release(page); | |
d5a0d4f7 | 2682 | ext4_journal_stop(handle); |
47564bfb | 2683 | goto retry_grab; |
d5a0d4f7 | 2684 | } |
47564bfb | 2685 | /* In case writeback began while the page was unlocked */ |
7afe5aa5 | 2686 | wait_for_stable_page(page); |
64769240 | 2687 | |
6e1db88d | 2688 | ret = __block_write_begin(page, pos, len, ext4_da_get_block_prep); |
64769240 AT |
2689 | if (ret < 0) { |
2690 | unlock_page(page); | |
2691 | ext4_journal_stop(handle); | |
ae4d5372 AK |
2692 | /* |
2693 | * block_write_begin may have instantiated a few blocks | |
2694 | * outside i_size. Trim these off again. Don't need | |
2695 | * i_size_read because we hold i_mutex. | |
2696 | */ | |
2697 | if (pos + len > inode->i_size) | |
b9a4207d | 2698 | ext4_truncate_failed_write(inode); |
47564bfb TT |
2699 | |
2700 | if (ret == -ENOSPC && | |
2701 | ext4_should_retry_alloc(inode->i_sb, &retries)) | |
2702 | goto retry_journal; | |
2703 | ||
2704 | page_cache_release(page); | |
2705 | return ret; | |
64769240 AT |
2706 | } |
2707 | ||
47564bfb | 2708 | *pagep = page; |
64769240 AT |
2709 | return ret; |
2710 | } | |
2711 | ||
632eaeab MC |
2712 | /* |
2713 | * Check if we should update i_disksize | |
2714 | * when write to the end of file but not require block allocation | |
2715 | */ | |
2716 | static int ext4_da_should_update_i_disksize(struct page *page, | |
de9a55b8 | 2717 | unsigned long offset) |
632eaeab MC |
2718 | { |
2719 | struct buffer_head *bh; | |
2720 | struct inode *inode = page->mapping->host; | |
2721 | unsigned int idx; | |
2722 | int i; | |
2723 | ||
2724 | bh = page_buffers(page); | |
2725 | idx = offset >> inode->i_blkbits; | |
2726 | ||
af5bc92d | 2727 | for (i = 0; i < idx; i++) |
632eaeab MC |
2728 | bh = bh->b_this_page; |
2729 | ||
29fa89d0 | 2730 | if (!buffer_mapped(bh) || (buffer_delay(bh)) || buffer_unwritten(bh)) |
632eaeab MC |
2731 | return 0; |
2732 | return 1; | |
2733 | } | |
2734 | ||
64769240 | 2735 | static int ext4_da_write_end(struct file *file, |
de9a55b8 TT |
2736 | struct address_space *mapping, |
2737 | loff_t pos, unsigned len, unsigned copied, | |
2738 | struct page *page, void *fsdata) | |
64769240 AT |
2739 | { |
2740 | struct inode *inode = mapping->host; | |
2741 | int ret = 0, ret2; | |
2742 | handle_t *handle = ext4_journal_current_handle(); | |
2743 | loff_t new_i_size; | |
632eaeab | 2744 | unsigned long start, end; |
79f0be8d AK |
2745 | int write_mode = (int)(unsigned long)fsdata; |
2746 | ||
74d553aa TT |
2747 | if (write_mode == FALL_BACK_TO_NONDELALLOC) |
2748 | return ext4_write_end(file, mapping, pos, | |
2749 | len, copied, page, fsdata); | |
632eaeab | 2750 | |
9bffad1e | 2751 | trace_ext4_da_write_end(inode, pos, len, copied); |
632eaeab | 2752 | start = pos & (PAGE_CACHE_SIZE - 1); |
af5bc92d | 2753 | end = start + copied - 1; |
64769240 AT |
2754 | |
2755 | /* | |
2756 | * generic_write_end() will run mark_inode_dirty() if i_size | |
2757 | * changes. So let's piggyback the i_disksize mark_inode_dirty | |
2758 | * into that. | |
2759 | */ | |
64769240 | 2760 | new_i_size = pos + copied; |
ea51d132 | 2761 | if (copied && new_i_size > EXT4_I(inode)->i_disksize) { |
9c3569b5 TM |
2762 | if (ext4_has_inline_data(inode) || |
2763 | ext4_da_should_update_i_disksize(page, end)) { | |
632eaeab | 2764 | down_write(&EXT4_I(inode)->i_data_sem); |
f3b59291 | 2765 | if (new_i_size > EXT4_I(inode)->i_disksize) |
632eaeab | 2766 | EXT4_I(inode)->i_disksize = new_i_size; |
632eaeab | 2767 | up_write(&EXT4_I(inode)->i_data_sem); |
cf17fea6 AK |
2768 | /* We need to mark inode dirty even if |
2769 | * new_i_size is less that inode->i_size | |
2770 | * bu greater than i_disksize.(hint delalloc) | |
2771 | */ | |
2772 | ext4_mark_inode_dirty(handle, inode); | |
64769240 | 2773 | } |
632eaeab | 2774 | } |
9c3569b5 TM |
2775 | |
2776 | if (write_mode != CONVERT_INLINE_DATA && | |
2777 | ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA) && | |
2778 | ext4_has_inline_data(inode)) | |
2779 | ret2 = ext4_da_write_inline_data_end(inode, pos, len, copied, | |
2780 | page); | |
2781 | else | |
2782 | ret2 = generic_write_end(file, mapping, pos, len, copied, | |
64769240 | 2783 | page, fsdata); |
9c3569b5 | 2784 | |
64769240 AT |
2785 | copied = ret2; |
2786 | if (ret2 < 0) | |
2787 | ret = ret2; | |
2788 | ret2 = ext4_journal_stop(handle); | |
2789 | if (!ret) | |
2790 | ret = ret2; | |
2791 | ||
2792 | return ret ? ret : copied; | |
2793 | } | |
2794 | ||
d47992f8 LC |
2795 | static void ext4_da_invalidatepage(struct page *page, unsigned int offset, |
2796 | unsigned int length) | |
64769240 | 2797 | { |
64769240 AT |
2798 | /* |
2799 | * Drop reserved blocks | |
2800 | */ | |
2801 | BUG_ON(!PageLocked(page)); | |
2802 | if (!page_has_buffers(page)) | |
2803 | goto out; | |
2804 | ||
ca99fdd2 | 2805 | ext4_da_page_release_reservation(page, offset, length); |
64769240 AT |
2806 | |
2807 | out: | |
d47992f8 | 2808 | ext4_invalidatepage(page, offset, length); |
64769240 AT |
2809 | |
2810 | return; | |
2811 | } | |
2812 | ||
ccd2506b TT |
2813 | /* |
2814 | * Force all delayed allocation blocks to be allocated for a given inode. | |
2815 | */ | |
2816 | int ext4_alloc_da_blocks(struct inode *inode) | |
2817 | { | |
fb40ba0d TT |
2818 | trace_ext4_alloc_da_blocks(inode); |
2819 | ||
ccd2506b TT |
2820 | if (!EXT4_I(inode)->i_reserved_data_blocks && |
2821 | !EXT4_I(inode)->i_reserved_meta_blocks) | |
2822 | return 0; | |
2823 | ||
2824 | /* | |
2825 | * We do something simple for now. The filemap_flush() will | |
2826 | * also start triggering a write of the data blocks, which is | |
2827 | * not strictly speaking necessary (and for users of | |
2828 | * laptop_mode, not even desirable). However, to do otherwise | |
2829 | * would require replicating code paths in: | |
de9a55b8 | 2830 | * |
20970ba6 | 2831 | * ext4_writepages() -> |
ccd2506b TT |
2832 | * write_cache_pages() ---> (via passed in callback function) |
2833 | * __mpage_da_writepage() --> | |
2834 | * mpage_add_bh_to_extent() | |
2835 | * mpage_da_map_blocks() | |
2836 | * | |
2837 | * The problem is that write_cache_pages(), located in | |
2838 | * mm/page-writeback.c, marks pages clean in preparation for | |
2839 | * doing I/O, which is not desirable if we're not planning on | |
2840 | * doing I/O at all. | |
2841 | * | |
2842 | * We could call write_cache_pages(), and then redirty all of | |
380cf090 | 2843 | * the pages by calling redirty_page_for_writepage() but that |
ccd2506b TT |
2844 | * would be ugly in the extreme. So instead we would need to |
2845 | * replicate parts of the code in the above functions, | |
25985edc | 2846 | * simplifying them because we wouldn't actually intend to |
ccd2506b TT |
2847 | * write out the pages, but rather only collect contiguous |
2848 | * logical block extents, call the multi-block allocator, and | |
2849 | * then update the buffer heads with the block allocations. | |
de9a55b8 | 2850 | * |
ccd2506b TT |
2851 | * For now, though, we'll cheat by calling filemap_flush(), |
2852 | * which will map the blocks, and start the I/O, but not | |
2853 | * actually wait for the I/O to complete. | |
2854 | */ | |
2855 | return filemap_flush(inode->i_mapping); | |
2856 | } | |
64769240 | 2857 | |
ac27a0ec DK |
2858 | /* |
2859 | * bmap() is special. It gets used by applications such as lilo and by | |
2860 | * the swapper to find the on-disk block of a specific piece of data. | |
2861 | * | |
2862 | * Naturally, this is dangerous if the block concerned is still in the | |
617ba13b | 2863 | * journal. If somebody makes a swapfile on an ext4 data-journaling |
ac27a0ec DK |
2864 | * filesystem and enables swap, then they may get a nasty shock when the |
2865 | * data getting swapped to that swapfile suddenly gets overwritten by | |
2866 | * the original zero's written out previously to the journal and | |
2867 | * awaiting writeback in the kernel's buffer cache. | |
2868 | * | |
2869 | * So, if we see any bmap calls here on a modified, data-journaled file, | |
2870 | * take extra steps to flush any blocks which might be in the cache. | |
2871 | */ | |
617ba13b | 2872 | static sector_t ext4_bmap(struct address_space *mapping, sector_t block) |
ac27a0ec DK |
2873 | { |
2874 | struct inode *inode = mapping->host; | |
2875 | journal_t *journal; | |
2876 | int err; | |
2877 | ||
46c7f254 TM |
2878 | /* |
2879 | * We can get here for an inline file via the FIBMAP ioctl | |
2880 | */ | |
2881 | if (ext4_has_inline_data(inode)) | |
2882 | return 0; | |
2883 | ||
64769240 AT |
2884 | if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY) && |
2885 | test_opt(inode->i_sb, DELALLOC)) { | |
2886 | /* | |
2887 | * With delalloc we want to sync the file | |
2888 | * so that we can make sure we allocate | |
2889 | * blocks for file | |
2890 | */ | |
2891 | filemap_write_and_wait(mapping); | |
2892 | } | |
2893 | ||
19f5fb7a TT |
2894 | if (EXT4_JOURNAL(inode) && |
2895 | ext4_test_inode_state(inode, EXT4_STATE_JDATA)) { | |
ac27a0ec DK |
2896 | /* |
2897 | * This is a REALLY heavyweight approach, but the use of | |
2898 | * bmap on dirty files is expected to be extremely rare: | |
2899 | * only if we run lilo or swapon on a freshly made file | |
2900 | * do we expect this to happen. | |
2901 | * | |
2902 | * (bmap requires CAP_SYS_RAWIO so this does not | |
2903 | * represent an unprivileged user DOS attack --- we'd be | |
2904 | * in trouble if mortal users could trigger this path at | |
2905 | * will.) | |
2906 | * | |
617ba13b | 2907 | * NB. EXT4_STATE_JDATA is not set on files other than |
ac27a0ec DK |
2908 | * regular files. If somebody wants to bmap a directory |
2909 | * or symlink and gets confused because the buffer | |
2910 | * hasn't yet been flushed to disk, they deserve | |
2911 | * everything they get. | |
2912 | */ | |
2913 | ||
19f5fb7a | 2914 | ext4_clear_inode_state(inode, EXT4_STATE_JDATA); |
617ba13b | 2915 | journal = EXT4_JOURNAL(inode); |
dab291af MC |
2916 | jbd2_journal_lock_updates(journal); |
2917 | err = jbd2_journal_flush(journal); | |
2918 | jbd2_journal_unlock_updates(journal); | |
ac27a0ec DK |
2919 | |
2920 | if (err) | |
2921 | return 0; | |
2922 | } | |
2923 | ||
af5bc92d | 2924 | return generic_block_bmap(mapping, block, ext4_get_block); |
ac27a0ec DK |
2925 | } |
2926 | ||
617ba13b | 2927 | static int ext4_readpage(struct file *file, struct page *page) |
ac27a0ec | 2928 | { |
46c7f254 TM |
2929 | int ret = -EAGAIN; |
2930 | struct inode *inode = page->mapping->host; | |
2931 | ||
0562e0ba | 2932 | trace_ext4_readpage(page); |
46c7f254 TM |
2933 | |
2934 | if (ext4_has_inline_data(inode)) | |
2935 | ret = ext4_readpage_inline(inode, page); | |
2936 | ||
2937 | if (ret == -EAGAIN) | |
2938 | return mpage_readpage(page, ext4_get_block); | |
2939 | ||
2940 | return ret; | |
ac27a0ec DK |
2941 | } |
2942 | ||
2943 | static int | |
617ba13b | 2944 | ext4_readpages(struct file *file, struct address_space *mapping, |
ac27a0ec DK |
2945 | struct list_head *pages, unsigned nr_pages) |
2946 | { | |
46c7f254 TM |
2947 | struct inode *inode = mapping->host; |
2948 | ||
2949 | /* If the file has inline data, no need to do readpages. */ | |
2950 | if (ext4_has_inline_data(inode)) | |
2951 | return 0; | |
2952 | ||
617ba13b | 2953 | return mpage_readpages(mapping, pages, nr_pages, ext4_get_block); |
ac27a0ec DK |
2954 | } |
2955 | ||
d47992f8 LC |
2956 | static void ext4_invalidatepage(struct page *page, unsigned int offset, |
2957 | unsigned int length) | |
ac27a0ec | 2958 | { |
ca99fdd2 | 2959 | trace_ext4_invalidatepage(page, offset, length); |
0562e0ba | 2960 | |
4520fb3c JK |
2961 | /* No journalling happens on data buffers when this function is used */ |
2962 | WARN_ON(page_has_buffers(page) && buffer_jbd(page_buffers(page))); | |
2963 | ||
ca99fdd2 | 2964 | block_invalidatepage(page, offset, length); |
4520fb3c JK |
2965 | } |
2966 | ||
53e87268 | 2967 | static int __ext4_journalled_invalidatepage(struct page *page, |
ca99fdd2 LC |
2968 | unsigned int offset, |
2969 | unsigned int length) | |
4520fb3c JK |
2970 | { |
2971 | journal_t *journal = EXT4_JOURNAL(page->mapping->host); | |
2972 | ||
ca99fdd2 | 2973 | trace_ext4_journalled_invalidatepage(page, offset, length); |
4520fb3c | 2974 | |
ac27a0ec DK |
2975 | /* |
2976 | * If it's a full truncate we just forget about the pending dirtying | |
2977 | */ | |
ca99fdd2 | 2978 | if (offset == 0 && length == PAGE_CACHE_SIZE) |
ac27a0ec DK |
2979 | ClearPageChecked(page); |
2980 | ||
ca99fdd2 | 2981 | return jbd2_journal_invalidatepage(journal, page, offset, length); |
53e87268 JK |
2982 | } |
2983 | ||
2984 | /* Wrapper for aops... */ | |
2985 | static void ext4_journalled_invalidatepage(struct page *page, | |
d47992f8 LC |
2986 | unsigned int offset, |
2987 | unsigned int length) | |
53e87268 | 2988 | { |
ca99fdd2 | 2989 | WARN_ON(__ext4_journalled_invalidatepage(page, offset, length) < 0); |
ac27a0ec DK |
2990 | } |
2991 | ||
617ba13b | 2992 | static int ext4_releasepage(struct page *page, gfp_t wait) |
ac27a0ec | 2993 | { |
617ba13b | 2994 | journal_t *journal = EXT4_JOURNAL(page->mapping->host); |
ac27a0ec | 2995 | |
0562e0ba JZ |
2996 | trace_ext4_releasepage(page); |
2997 | ||
e1c36595 JK |
2998 | /* Page has dirty journalled data -> cannot release */ |
2999 | if (PageChecked(page)) | |
ac27a0ec | 3000 | return 0; |
0390131b FM |
3001 | if (journal) |
3002 | return jbd2_journal_try_to_free_buffers(journal, page, wait); | |
3003 | else | |
3004 | return try_to_free_buffers(page); | |
ac27a0ec DK |
3005 | } |
3006 | ||
2ed88685 TT |
3007 | /* |
3008 | * ext4_get_block used when preparing for a DIO write or buffer write. | |
3009 | * We allocate an uinitialized extent if blocks haven't been allocated. | |
3010 | * The extent will be converted to initialized after the IO is complete. | |
3011 | */ | |
f19d5870 | 3012 | int ext4_get_block_write(struct inode *inode, sector_t iblock, |
4c0425ff MC |
3013 | struct buffer_head *bh_result, int create) |
3014 | { | |
c7064ef1 | 3015 | ext4_debug("ext4_get_block_write: inode %lu, create flag %d\n", |
8d5d02e6 | 3016 | inode->i_ino, create); |
2ed88685 TT |
3017 | return _ext4_get_block(inode, iblock, bh_result, |
3018 | EXT4_GET_BLOCKS_IO_CREATE_EXT); | |
4c0425ff MC |
3019 | } |
3020 | ||
729f52c6 | 3021 | static int ext4_get_block_write_nolock(struct inode *inode, sector_t iblock, |
8b0f165f | 3022 | struct buffer_head *bh_result, int create) |
729f52c6 | 3023 | { |
8b0f165f AP |
3024 | ext4_debug("ext4_get_block_write_nolock: inode %lu, create flag %d\n", |
3025 | inode->i_ino, create); | |
3026 | return _ext4_get_block(inode, iblock, bh_result, | |
3027 | EXT4_GET_BLOCKS_NO_LOCK); | |
729f52c6 ZL |
3028 | } |
3029 | ||
4c0425ff | 3030 | static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset, |
7b7a8665 | 3031 | ssize_t size, void *private) |
4c0425ff MC |
3032 | { |
3033 | ext4_io_end_t *io_end = iocb->private; | |
4c0425ff | 3034 | |
97a851ed | 3035 | /* if not async direct IO just return */ |
7b7a8665 | 3036 | if (!io_end) |
97a851ed | 3037 | return; |
4b70df18 | 3038 | |
88635ca2 | 3039 | ext_debug("ext4_end_io_dio(): io_end 0x%p " |
ace36ad4 | 3040 | "for inode %lu, iocb 0x%p, offset %llu, size %zd\n", |
8d5d02e6 MC |
3041 | iocb->private, io_end->inode->i_ino, iocb, offset, |
3042 | size); | |
8d5d02e6 | 3043 | |
b5a7e970 | 3044 | iocb->private = NULL; |
4c0425ff MC |
3045 | io_end->offset = offset; |
3046 | io_end->size = size; | |
7b7a8665 | 3047 | ext4_put_io_end(io_end); |
4c0425ff | 3048 | } |
c7064ef1 | 3049 | |
4c0425ff MC |
3050 | /* |
3051 | * For ext4 extent files, ext4 will do direct-io write to holes, | |
3052 | * preallocated extents, and those write extend the file, no need to | |
3053 | * fall back to buffered IO. | |
3054 | * | |
b595076a | 3055 | * For holes, we fallocate those blocks, mark them as uninitialized |
69c499d1 | 3056 | * If those blocks were preallocated, we mark sure they are split, but |
b595076a | 3057 | * still keep the range to write as uninitialized. |
4c0425ff | 3058 | * |
69c499d1 | 3059 | * The unwritten extents will be converted to written when DIO is completed. |
8d5d02e6 | 3060 | * For async direct IO, since the IO may still pending when return, we |
25985edc | 3061 | * set up an end_io call back function, which will do the conversion |
8d5d02e6 | 3062 | * when async direct IO completed. |
4c0425ff MC |
3063 | * |
3064 | * If the O_DIRECT write will extend the file then add this inode to the | |
3065 | * orphan list. So recovery will truncate it back to the original size | |
3066 | * if the machine crashes during the write. | |
3067 | * | |
3068 | */ | |
3069 | static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb, | |
3070 | const struct iovec *iov, loff_t offset, | |
3071 | unsigned long nr_segs) | |
3072 | { | |
3073 | struct file *file = iocb->ki_filp; | |
3074 | struct inode *inode = file->f_mapping->host; | |
3075 | ssize_t ret; | |
3076 | size_t count = iov_length(iov, nr_segs); | |
69c499d1 TT |
3077 | int overwrite = 0; |
3078 | get_block_t *get_block_func = NULL; | |
3079 | int dio_flags = 0; | |
4c0425ff | 3080 | loff_t final_size = offset + count; |
97a851ed | 3081 | ext4_io_end_t *io_end = NULL; |
729f52c6 | 3082 | |
69c499d1 TT |
3083 | /* Use the old path for reads and writes beyond i_size. */ |
3084 | if (rw != WRITE || final_size > inode->i_size) | |
3085 | return ext4_ind_direct_IO(rw, iocb, iov, offset, nr_segs); | |
4bd809db | 3086 | |
69c499d1 | 3087 | BUG_ON(iocb->private == NULL); |
4bd809db | 3088 | |
e8340395 JK |
3089 | /* |
3090 | * Make all waiters for direct IO properly wait also for extent | |
3091 | * conversion. This also disallows race between truncate() and | |
3092 | * overwrite DIO as i_dio_count needs to be incremented under i_mutex. | |
3093 | */ | |
3094 | if (rw == WRITE) | |
3095 | atomic_inc(&inode->i_dio_count); | |
3096 | ||
69c499d1 TT |
3097 | /* If we do a overwrite dio, i_mutex locking can be released */ |
3098 | overwrite = *((int *)iocb->private); | |
4bd809db | 3099 | |
69c499d1 | 3100 | if (overwrite) { |
69c499d1 TT |
3101 | down_read(&EXT4_I(inode)->i_data_sem); |
3102 | mutex_unlock(&inode->i_mutex); | |
3103 | } | |
8d5d02e6 | 3104 | |
69c499d1 TT |
3105 | /* |
3106 | * We could direct write to holes and fallocate. | |
3107 | * | |
3108 | * Allocated blocks to fill the hole are marked as | |
3109 | * uninitialized to prevent parallel buffered read to expose | |
3110 | * the stale data before DIO complete the data IO. | |
3111 | * | |
3112 | * As to previously fallocated extents, ext4 get_block will | |
3113 | * just simply mark the buffer mapped but still keep the | |
3114 | * extents uninitialized. | |
3115 | * | |
3116 | * For non AIO case, we will convert those unwritten extents | |
3117 | * to written after return back from blockdev_direct_IO. | |
3118 | * | |
3119 | * For async DIO, the conversion needs to be deferred when the | |
3120 | * IO is completed. The ext4 end_io callback function will be | |
3121 | * called to take care of the conversion work. Here for async | |
3122 | * case, we allocate an io_end structure to hook to the iocb. | |
3123 | */ | |
3124 | iocb->private = NULL; | |
3125 | ext4_inode_aio_set(inode, NULL); | |
3126 | if (!is_sync_kiocb(iocb)) { | |
97a851ed | 3127 | io_end = ext4_init_io_end(inode, GFP_NOFS); |
69c499d1 TT |
3128 | if (!io_end) { |
3129 | ret = -ENOMEM; | |
3130 | goto retake_lock; | |
8b0f165f | 3131 | } |
97a851ed JK |
3132 | /* |
3133 | * Grab reference for DIO. Will be dropped in ext4_end_io_dio() | |
3134 | */ | |
3135 | iocb->private = ext4_get_io_end(io_end); | |
8d5d02e6 | 3136 | /* |
69c499d1 TT |
3137 | * we save the io structure for current async direct |
3138 | * IO, so that later ext4_map_blocks() could flag the | |
3139 | * io structure whether there is a unwritten extents | |
3140 | * needs to be converted when IO is completed. | |
8d5d02e6 | 3141 | */ |
69c499d1 TT |
3142 | ext4_inode_aio_set(inode, io_end); |
3143 | } | |
4bd809db | 3144 | |
69c499d1 TT |
3145 | if (overwrite) { |
3146 | get_block_func = ext4_get_block_write_nolock; | |
3147 | } else { | |
3148 | get_block_func = ext4_get_block_write; | |
3149 | dio_flags = DIO_LOCKING; | |
3150 | } | |
3151 | ret = __blockdev_direct_IO(rw, iocb, inode, | |
3152 | inode->i_sb->s_bdev, iov, | |
3153 | offset, nr_segs, | |
3154 | get_block_func, | |
3155 | ext4_end_io_dio, | |
3156 | NULL, | |
3157 | dio_flags); | |
3158 | ||
69c499d1 | 3159 | /* |
97a851ed JK |
3160 | * Put our reference to io_end. This can free the io_end structure e.g. |
3161 | * in sync IO case or in case of error. It can even perform extent | |
3162 | * conversion if all bios we submitted finished before we got here. | |
3163 | * Note that in that case iocb->private can be already set to NULL | |
3164 | * here. | |
69c499d1 | 3165 | */ |
97a851ed JK |
3166 | if (io_end) { |
3167 | ext4_inode_aio_set(inode, NULL); | |
3168 | ext4_put_io_end(io_end); | |
3169 | /* | |
3170 | * When no IO was submitted ext4_end_io_dio() was not | |
3171 | * called so we have to put iocb's reference. | |
3172 | */ | |
3173 | if (ret <= 0 && ret != -EIOCBQUEUED && iocb->private) { | |
3174 | WARN_ON(iocb->private != io_end); | |
3175 | WARN_ON(io_end->flag & EXT4_IO_END_UNWRITTEN); | |
97a851ed JK |
3176 | ext4_put_io_end(io_end); |
3177 | iocb->private = NULL; | |
3178 | } | |
3179 | } | |
3180 | if (ret > 0 && !overwrite && ext4_test_inode_state(inode, | |
69c499d1 TT |
3181 | EXT4_STATE_DIO_UNWRITTEN)) { |
3182 | int err; | |
3183 | /* | |
3184 | * for non AIO case, since the IO is already | |
3185 | * completed, we could do the conversion right here | |
3186 | */ | |
6b523df4 | 3187 | err = ext4_convert_unwritten_extents(NULL, inode, |
69c499d1 TT |
3188 | offset, ret); |
3189 | if (err < 0) | |
3190 | ret = err; | |
3191 | ext4_clear_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN); | |
3192 | } | |
4bd809db | 3193 | |
69c499d1 | 3194 | retake_lock: |
e8340395 JK |
3195 | if (rw == WRITE) |
3196 | inode_dio_done(inode); | |
69c499d1 TT |
3197 | /* take i_mutex locking again if we do a ovewrite dio */ |
3198 | if (overwrite) { | |
69c499d1 TT |
3199 | up_read(&EXT4_I(inode)->i_data_sem); |
3200 | mutex_lock(&inode->i_mutex); | |
4c0425ff | 3201 | } |
8d5d02e6 | 3202 | |
69c499d1 | 3203 | return ret; |
4c0425ff MC |
3204 | } |
3205 | ||
3206 | static ssize_t ext4_direct_IO(int rw, struct kiocb *iocb, | |
3207 | const struct iovec *iov, loff_t offset, | |
3208 | unsigned long nr_segs) | |
3209 | { | |
3210 | struct file *file = iocb->ki_filp; | |
3211 | struct inode *inode = file->f_mapping->host; | |
0562e0ba | 3212 | ssize_t ret; |
4c0425ff | 3213 | |
84ebd795 TT |
3214 | /* |
3215 | * If we are doing data journalling we don't support O_DIRECT | |
3216 | */ | |
3217 | if (ext4_should_journal_data(inode)) | |
3218 | return 0; | |
3219 | ||
46c7f254 TM |
3220 | /* Let buffer I/O handle the inline data case. */ |
3221 | if (ext4_has_inline_data(inode)) | |
3222 | return 0; | |
3223 | ||
0562e0ba | 3224 | trace_ext4_direct_IO_enter(inode, offset, iov_length(iov, nr_segs), rw); |
12e9b892 | 3225 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
0562e0ba JZ |
3226 | ret = ext4_ext_direct_IO(rw, iocb, iov, offset, nr_segs); |
3227 | else | |
3228 | ret = ext4_ind_direct_IO(rw, iocb, iov, offset, nr_segs); | |
3229 | trace_ext4_direct_IO_exit(inode, offset, | |
3230 | iov_length(iov, nr_segs), rw, ret); | |
3231 | return ret; | |
4c0425ff MC |
3232 | } |
3233 | ||
ac27a0ec | 3234 | /* |
617ba13b | 3235 | * Pages can be marked dirty completely asynchronously from ext4's journalling |
ac27a0ec DK |
3236 | * activity. By filemap_sync_pte(), try_to_unmap_one(), etc. We cannot do |
3237 | * much here because ->set_page_dirty is called under VFS locks. The page is | |
3238 | * not necessarily locked. | |
3239 | * | |
3240 | * We cannot just dirty the page and leave attached buffers clean, because the | |
3241 | * buffers' dirty state is "definitive". We cannot just set the buffers dirty | |
3242 | * or jbddirty because all the journalling code will explode. | |
3243 | * | |
3244 | * So what we do is to mark the page "pending dirty" and next time writepage | |
3245 | * is called, propagate that into the buffers appropriately. | |
3246 | */ | |
617ba13b | 3247 | static int ext4_journalled_set_page_dirty(struct page *page) |
ac27a0ec DK |
3248 | { |
3249 | SetPageChecked(page); | |
3250 | return __set_page_dirty_nobuffers(page); | |
3251 | } | |
3252 | ||
74d553aa | 3253 | static const struct address_space_operations ext4_aops = { |
8ab22b9a HH |
3254 | .readpage = ext4_readpage, |
3255 | .readpages = ext4_readpages, | |
43ce1d23 | 3256 | .writepage = ext4_writepage, |
20970ba6 | 3257 | .writepages = ext4_writepages, |
8ab22b9a | 3258 | .write_begin = ext4_write_begin, |
74d553aa | 3259 | .write_end = ext4_write_end, |
8ab22b9a HH |
3260 | .bmap = ext4_bmap, |
3261 | .invalidatepage = ext4_invalidatepage, | |
3262 | .releasepage = ext4_releasepage, | |
3263 | .direct_IO = ext4_direct_IO, | |
3264 | .migratepage = buffer_migrate_page, | |
3265 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 3266 | .error_remove_page = generic_error_remove_page, |
ac27a0ec DK |
3267 | }; |
3268 | ||
617ba13b | 3269 | static const struct address_space_operations ext4_journalled_aops = { |
8ab22b9a HH |
3270 | .readpage = ext4_readpage, |
3271 | .readpages = ext4_readpages, | |
43ce1d23 | 3272 | .writepage = ext4_writepage, |
20970ba6 | 3273 | .writepages = ext4_writepages, |
8ab22b9a HH |
3274 | .write_begin = ext4_write_begin, |
3275 | .write_end = ext4_journalled_write_end, | |
3276 | .set_page_dirty = ext4_journalled_set_page_dirty, | |
3277 | .bmap = ext4_bmap, | |
4520fb3c | 3278 | .invalidatepage = ext4_journalled_invalidatepage, |
8ab22b9a | 3279 | .releasepage = ext4_releasepage, |
84ebd795 | 3280 | .direct_IO = ext4_direct_IO, |
8ab22b9a | 3281 | .is_partially_uptodate = block_is_partially_uptodate, |
aa261f54 | 3282 | .error_remove_page = generic_error_remove_page, |
ac27a0ec DK |
3283 | }; |
3284 | ||
64769240 | 3285 | static const struct address_space_operations ext4_da_aops = { |
8ab22b9a HH |
3286 | .readpage = ext4_readpage, |
3287 | .readpages = ext4_readpages, | |
43ce1d23 | 3288 | .writepage = ext4_writepage, |
20970ba6 | 3289 | .writepages = ext4_writepages, |
8ab22b9a HH |
3290 | .write_begin = ext4_da_write_begin, |
3291 | .write_end = ext4_da_write_end, | |
3292 | .bmap = ext4_bmap, | |
3293 | .invalidatepage = ext4_da_invalidatepage, | |
3294 | .releasepage = ext4_releasepage, | |
3295 | .direct_IO = ext4_direct_IO, | |
3296 | .migratepage = buffer_migrate_page, | |
3297 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 3298 | .error_remove_page = generic_error_remove_page, |
64769240 AT |
3299 | }; |
3300 | ||
617ba13b | 3301 | void ext4_set_aops(struct inode *inode) |
ac27a0ec | 3302 | { |
3d2b1582 LC |
3303 | switch (ext4_inode_journal_mode(inode)) { |
3304 | case EXT4_INODE_ORDERED_DATA_MODE: | |
74d553aa | 3305 | ext4_set_inode_state(inode, EXT4_STATE_ORDERED_MODE); |
3d2b1582 LC |
3306 | break; |
3307 | case EXT4_INODE_WRITEBACK_DATA_MODE: | |
74d553aa | 3308 | ext4_clear_inode_state(inode, EXT4_STATE_ORDERED_MODE); |
3d2b1582 LC |
3309 | break; |
3310 | case EXT4_INODE_JOURNAL_DATA_MODE: | |
617ba13b | 3311 | inode->i_mapping->a_ops = &ext4_journalled_aops; |
74d553aa | 3312 | return; |
3d2b1582 LC |
3313 | default: |
3314 | BUG(); | |
3315 | } | |
74d553aa TT |
3316 | if (test_opt(inode->i_sb, DELALLOC)) |
3317 | inode->i_mapping->a_ops = &ext4_da_aops; | |
3318 | else | |
3319 | inode->i_mapping->a_ops = &ext4_aops; | |
ac27a0ec DK |
3320 | } |
3321 | ||
d863dc36 LC |
3322 | /* |
3323 | * ext4_block_truncate_page() zeroes out a mapping from file offset `from' | |
3324 | * up to the end of the block which corresponds to `from'. | |
3325 | * This required during truncate. We need to physically zero the tail end | |
3326 | * of that block so it doesn't yield old data if the file is later grown. | |
3327 | */ | |
3328 | int ext4_block_truncate_page(handle_t *handle, | |
3329 | struct address_space *mapping, loff_t from) | |
3330 | { | |
3331 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
3332 | unsigned length; | |
3333 | unsigned blocksize; | |
3334 | struct inode *inode = mapping->host; | |
3335 | ||
3336 | blocksize = inode->i_sb->s_blocksize; | |
3337 | length = blocksize - (offset & (blocksize - 1)); | |
3338 | ||
3339 | return ext4_block_zero_page_range(handle, mapping, from, length); | |
3340 | } | |
3341 | ||
3342 | /* | |
3343 | * ext4_block_zero_page_range() zeros out a mapping of length 'length' | |
3344 | * starting from file offset 'from'. The range to be zero'd must | |
3345 | * be contained with in one block. If the specified range exceeds | |
3346 | * the end of the block it will be shortened to end of the block | |
3347 | * that cooresponds to 'from' | |
3348 | */ | |
3349 | int ext4_block_zero_page_range(handle_t *handle, | |
3350 | struct address_space *mapping, loff_t from, loff_t length) | |
3351 | { | |
3352 | ext4_fsblk_t index = from >> PAGE_CACHE_SHIFT; | |
3353 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
3354 | unsigned blocksize, max, pos; | |
3355 | ext4_lblk_t iblock; | |
3356 | struct inode *inode = mapping->host; | |
3357 | struct buffer_head *bh; | |
3358 | struct page *page; | |
3359 | int err = 0; | |
3360 | ||
3361 | page = find_or_create_page(mapping, from >> PAGE_CACHE_SHIFT, | |
3362 | mapping_gfp_mask(mapping) & ~__GFP_FS); | |
3363 | if (!page) | |
3364 | return -ENOMEM; | |
3365 | ||
3366 | blocksize = inode->i_sb->s_blocksize; | |
3367 | max = blocksize - (offset & (blocksize - 1)); | |
3368 | ||
3369 | /* | |
3370 | * correct length if it does not fall between | |
3371 | * 'from' and the end of the block | |
3372 | */ | |
3373 | if (length > max || length < 0) | |
3374 | length = max; | |
3375 | ||
3376 | iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); | |
3377 | ||
3378 | if (!page_has_buffers(page)) | |
3379 | create_empty_buffers(page, blocksize, 0); | |
3380 | ||
3381 | /* Find the buffer that contains "offset" */ | |
3382 | bh = page_buffers(page); | |
3383 | pos = blocksize; | |
3384 | while (offset >= pos) { | |
3385 | bh = bh->b_this_page; | |
3386 | iblock++; | |
3387 | pos += blocksize; | |
3388 | } | |
d863dc36 LC |
3389 | if (buffer_freed(bh)) { |
3390 | BUFFER_TRACE(bh, "freed: skip"); | |
3391 | goto unlock; | |
3392 | } | |
d863dc36 LC |
3393 | if (!buffer_mapped(bh)) { |
3394 | BUFFER_TRACE(bh, "unmapped"); | |
3395 | ext4_get_block(inode, iblock, bh, 0); | |
3396 | /* unmapped? It's a hole - nothing to do */ | |
3397 | if (!buffer_mapped(bh)) { | |
3398 | BUFFER_TRACE(bh, "still unmapped"); | |
3399 | goto unlock; | |
3400 | } | |
3401 | } | |
3402 | ||
3403 | /* Ok, it's mapped. Make sure it's up-to-date */ | |
3404 | if (PageUptodate(page)) | |
3405 | set_buffer_uptodate(bh); | |
3406 | ||
3407 | if (!buffer_uptodate(bh)) { | |
3408 | err = -EIO; | |
3409 | ll_rw_block(READ, 1, &bh); | |
3410 | wait_on_buffer(bh); | |
3411 | /* Uhhuh. Read error. Complain and punt. */ | |
3412 | if (!buffer_uptodate(bh)) | |
3413 | goto unlock; | |
3414 | } | |
d863dc36 LC |
3415 | if (ext4_should_journal_data(inode)) { |
3416 | BUFFER_TRACE(bh, "get write access"); | |
3417 | err = ext4_journal_get_write_access(handle, bh); | |
3418 | if (err) | |
3419 | goto unlock; | |
3420 | } | |
d863dc36 | 3421 | zero_user(page, offset, length); |
d863dc36 LC |
3422 | BUFFER_TRACE(bh, "zeroed end of block"); |
3423 | ||
d863dc36 LC |
3424 | if (ext4_should_journal_data(inode)) { |
3425 | err = ext4_handle_dirty_metadata(handle, inode, bh); | |
0713ed0c | 3426 | } else { |
353eefd3 | 3427 | err = 0; |
d863dc36 | 3428 | mark_buffer_dirty(bh); |
0713ed0c LC |
3429 | if (ext4_test_inode_state(inode, EXT4_STATE_ORDERED_MODE)) |
3430 | err = ext4_jbd2_file_inode(handle, inode); | |
3431 | } | |
d863dc36 LC |
3432 | |
3433 | unlock: | |
3434 | unlock_page(page); | |
3435 | page_cache_release(page); | |
3436 | return err; | |
3437 | } | |
3438 | ||
a87dd18c LC |
3439 | int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, |
3440 | loff_t lstart, loff_t length) | |
3441 | { | |
3442 | struct super_block *sb = inode->i_sb; | |
3443 | struct address_space *mapping = inode->i_mapping; | |
e1be3a92 | 3444 | unsigned partial_start, partial_end; |
a87dd18c LC |
3445 | ext4_fsblk_t start, end; |
3446 | loff_t byte_end = (lstart + length - 1); | |
3447 | int err = 0; | |
3448 | ||
e1be3a92 LC |
3449 | partial_start = lstart & (sb->s_blocksize - 1); |
3450 | partial_end = byte_end & (sb->s_blocksize - 1); | |
3451 | ||
a87dd18c LC |
3452 | start = lstart >> sb->s_blocksize_bits; |
3453 | end = byte_end >> sb->s_blocksize_bits; | |
3454 | ||
3455 | /* Handle partial zero within the single block */ | |
e1be3a92 LC |
3456 | if (start == end && |
3457 | (partial_start || (partial_end != sb->s_blocksize - 1))) { | |
a87dd18c LC |
3458 | err = ext4_block_zero_page_range(handle, mapping, |
3459 | lstart, length); | |
3460 | return err; | |
3461 | } | |
3462 | /* Handle partial zero out on the start of the range */ | |
e1be3a92 | 3463 | if (partial_start) { |
a87dd18c LC |
3464 | err = ext4_block_zero_page_range(handle, mapping, |
3465 | lstart, sb->s_blocksize); | |
3466 | if (err) | |
3467 | return err; | |
3468 | } | |
3469 | /* Handle partial zero out on the end of the range */ | |
e1be3a92 | 3470 | if (partial_end != sb->s_blocksize - 1) |
a87dd18c | 3471 | err = ext4_block_zero_page_range(handle, mapping, |
e1be3a92 LC |
3472 | byte_end - partial_end, |
3473 | partial_end + 1); | |
a87dd18c LC |
3474 | return err; |
3475 | } | |
3476 | ||
91ef4caf DG |
3477 | int ext4_can_truncate(struct inode *inode) |
3478 | { | |
91ef4caf DG |
3479 | if (S_ISREG(inode->i_mode)) |
3480 | return 1; | |
3481 | if (S_ISDIR(inode->i_mode)) | |
3482 | return 1; | |
3483 | if (S_ISLNK(inode->i_mode)) | |
3484 | return !ext4_inode_is_fast_symlink(inode); | |
3485 | return 0; | |
3486 | } | |
3487 | ||
a4bb6b64 AH |
3488 | /* |
3489 | * ext4_punch_hole: punches a hole in a file by releaseing the blocks | |
3490 | * associated with the given offset and length | |
3491 | * | |
3492 | * @inode: File inode | |
3493 | * @offset: The offset where the hole will begin | |
3494 | * @len: The length of the hole | |
3495 | * | |
4907cb7b | 3496 | * Returns: 0 on success or negative on failure |
a4bb6b64 AH |
3497 | */ |
3498 | ||
aeb2817a | 3499 | int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length) |
a4bb6b64 | 3500 | { |
26a4c0c6 TT |
3501 | struct super_block *sb = inode->i_sb; |
3502 | ext4_lblk_t first_block, stop_block; | |
3503 | struct address_space *mapping = inode->i_mapping; | |
a87dd18c | 3504 | loff_t first_block_offset, last_block_offset; |
26a4c0c6 TT |
3505 | handle_t *handle; |
3506 | unsigned int credits; | |
3507 | int ret = 0; | |
3508 | ||
a4bb6b64 | 3509 | if (!S_ISREG(inode->i_mode)) |
73355192 | 3510 | return -EOPNOTSUPP; |
a4bb6b64 | 3511 | |
26a4c0c6 | 3512 | if (EXT4_SB(sb)->s_cluster_ratio > 1) { |
bab08ab9 | 3513 | /* TODO: Add support for bigalloc file systems */ |
73355192 | 3514 | return -EOPNOTSUPP; |
bab08ab9 TT |
3515 | } |
3516 | ||
aaddea81 ZL |
3517 | trace_ext4_punch_hole(inode, offset, length); |
3518 | ||
26a4c0c6 TT |
3519 | /* |
3520 | * Write out all dirty pages to avoid race conditions | |
3521 | * Then release them. | |
3522 | */ | |
3523 | if (mapping->nrpages && mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) { | |
3524 | ret = filemap_write_and_wait_range(mapping, offset, | |
3525 | offset + length - 1); | |
3526 | if (ret) | |
3527 | return ret; | |
3528 | } | |
3529 | ||
3530 | mutex_lock(&inode->i_mutex); | |
3531 | /* It's not possible punch hole on append only file */ | |
3532 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) { | |
3533 | ret = -EPERM; | |
3534 | goto out_mutex; | |
3535 | } | |
3536 | if (IS_SWAPFILE(inode)) { | |
3537 | ret = -ETXTBSY; | |
3538 | goto out_mutex; | |
3539 | } | |
3540 | ||
3541 | /* No need to punch hole beyond i_size */ | |
3542 | if (offset >= inode->i_size) | |
3543 | goto out_mutex; | |
3544 | ||
3545 | /* | |
3546 | * If the hole extends beyond i_size, set the hole | |
3547 | * to end after the page that contains i_size | |
3548 | */ | |
3549 | if (offset + length > inode->i_size) { | |
3550 | length = inode->i_size + | |
3551 | PAGE_CACHE_SIZE - (inode->i_size & (PAGE_CACHE_SIZE - 1)) - | |
3552 | offset; | |
3553 | } | |
3554 | ||
a361293f JK |
3555 | if (offset & (sb->s_blocksize - 1) || |
3556 | (offset + length) & (sb->s_blocksize - 1)) { | |
3557 | /* | |
3558 | * Attach jinode to inode for jbd2 if we do any zeroing of | |
3559 | * partial block | |
3560 | */ | |
3561 | ret = ext4_inode_attach_jinode(inode); | |
3562 | if (ret < 0) | |
3563 | goto out_mutex; | |
3564 | ||
3565 | } | |
3566 | ||
a87dd18c LC |
3567 | first_block_offset = round_up(offset, sb->s_blocksize); |
3568 | last_block_offset = round_down((offset + length), sb->s_blocksize) - 1; | |
26a4c0c6 | 3569 | |
a87dd18c LC |
3570 | /* Now release the pages and zero block aligned part of pages*/ |
3571 | if (last_block_offset > first_block_offset) | |
3572 | truncate_pagecache_range(inode, first_block_offset, | |
3573 | last_block_offset); | |
26a4c0c6 TT |
3574 | |
3575 | /* Wait all existing dio workers, newcomers will block on i_mutex */ | |
3576 | ext4_inode_block_unlocked_dio(inode); | |
26a4c0c6 TT |
3577 | inode_dio_wait(inode); |
3578 | ||
3579 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) | |
3580 | credits = ext4_writepage_trans_blocks(inode); | |
3581 | else | |
3582 | credits = ext4_blocks_for_truncate(inode); | |
3583 | handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits); | |
3584 | if (IS_ERR(handle)) { | |
3585 | ret = PTR_ERR(handle); | |
3586 | ext4_std_error(sb, ret); | |
3587 | goto out_dio; | |
3588 | } | |
3589 | ||
a87dd18c LC |
3590 | ret = ext4_zero_partial_blocks(handle, inode, offset, |
3591 | length); | |
3592 | if (ret) | |
3593 | goto out_stop; | |
26a4c0c6 TT |
3594 | |
3595 | first_block = (offset + sb->s_blocksize - 1) >> | |
3596 | EXT4_BLOCK_SIZE_BITS(sb); | |
3597 | stop_block = (offset + length) >> EXT4_BLOCK_SIZE_BITS(sb); | |
3598 | ||
3599 | /* If there are no blocks to remove, return now */ | |
3600 | if (first_block >= stop_block) | |
3601 | goto out_stop; | |
3602 | ||
3603 | down_write(&EXT4_I(inode)->i_data_sem); | |
3604 | ext4_discard_preallocations(inode); | |
3605 | ||
3606 | ret = ext4_es_remove_extent(inode, first_block, | |
3607 | stop_block - first_block); | |
3608 | if (ret) { | |
3609 | up_write(&EXT4_I(inode)->i_data_sem); | |
3610 | goto out_stop; | |
3611 | } | |
3612 | ||
3613 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) | |
3614 | ret = ext4_ext_remove_space(inode, first_block, | |
3615 | stop_block - 1); | |
3616 | else | |
3617 | ret = ext4_free_hole_blocks(handle, inode, first_block, | |
3618 | stop_block); | |
3619 | ||
3620 | ext4_discard_preallocations(inode); | |
819c4920 | 3621 | up_write(&EXT4_I(inode)->i_data_sem); |
26a4c0c6 TT |
3622 | if (IS_SYNC(inode)) |
3623 | ext4_handle_sync(handle); | |
26a4c0c6 TT |
3624 | inode->i_mtime = inode->i_ctime = ext4_current_time(inode); |
3625 | ext4_mark_inode_dirty(handle, inode); | |
3626 | out_stop: | |
3627 | ext4_journal_stop(handle); | |
3628 | out_dio: | |
3629 | ext4_inode_resume_unlocked_dio(inode); | |
3630 | out_mutex: | |
3631 | mutex_unlock(&inode->i_mutex); | |
3632 | return ret; | |
a4bb6b64 AH |
3633 | } |
3634 | ||
a361293f JK |
3635 | int ext4_inode_attach_jinode(struct inode *inode) |
3636 | { | |
3637 | struct ext4_inode_info *ei = EXT4_I(inode); | |
3638 | struct jbd2_inode *jinode; | |
3639 | ||
3640 | if (ei->jinode || !EXT4_SB(inode->i_sb)->s_journal) | |
3641 | return 0; | |
3642 | ||
3643 | jinode = jbd2_alloc_inode(GFP_KERNEL); | |
3644 | spin_lock(&inode->i_lock); | |
3645 | if (!ei->jinode) { | |
3646 | if (!jinode) { | |
3647 | spin_unlock(&inode->i_lock); | |
3648 | return -ENOMEM; | |
3649 | } | |
3650 | ei->jinode = jinode; | |
3651 | jbd2_journal_init_jbd_inode(ei->jinode, inode); | |
3652 | jinode = NULL; | |
3653 | } | |
3654 | spin_unlock(&inode->i_lock); | |
3655 | if (unlikely(jinode != NULL)) | |
3656 | jbd2_free_inode(jinode); | |
3657 | return 0; | |
3658 | } | |
3659 | ||
ac27a0ec | 3660 | /* |
617ba13b | 3661 | * ext4_truncate() |
ac27a0ec | 3662 | * |
617ba13b MC |
3663 | * We block out ext4_get_block() block instantiations across the entire |
3664 | * transaction, and VFS/VM ensures that ext4_truncate() cannot run | |
ac27a0ec DK |
3665 | * simultaneously on behalf of the same inode. |
3666 | * | |
42b2aa86 | 3667 | * As we work through the truncate and commit bits of it to the journal there |
ac27a0ec DK |
3668 | * is one core, guiding principle: the file's tree must always be consistent on |
3669 | * disk. We must be able to restart the truncate after a crash. | |
3670 | * | |
3671 | * The file's tree may be transiently inconsistent in memory (although it | |
3672 | * probably isn't), but whenever we close off and commit a journal transaction, | |
3673 | * the contents of (the filesystem + the journal) must be consistent and | |
3674 | * restartable. It's pretty simple, really: bottom up, right to left (although | |
3675 | * left-to-right works OK too). | |
3676 | * | |
3677 | * Note that at recovery time, journal replay occurs *before* the restart of | |
3678 | * truncate against the orphan inode list. | |
3679 | * | |
3680 | * The committed inode has the new, desired i_size (which is the same as | |
617ba13b | 3681 | * i_disksize in this case). After a crash, ext4_orphan_cleanup() will see |
ac27a0ec | 3682 | * that this inode's truncate did not complete and it will again call |
617ba13b MC |
3683 | * ext4_truncate() to have another go. So there will be instantiated blocks |
3684 | * to the right of the truncation point in a crashed ext4 filesystem. But | |
ac27a0ec | 3685 | * that's fine - as long as they are linked from the inode, the post-crash |
617ba13b | 3686 | * ext4_truncate() run will find them and release them. |
ac27a0ec | 3687 | */ |
617ba13b | 3688 | void ext4_truncate(struct inode *inode) |
ac27a0ec | 3689 | { |
819c4920 TT |
3690 | struct ext4_inode_info *ei = EXT4_I(inode); |
3691 | unsigned int credits; | |
3692 | handle_t *handle; | |
3693 | struct address_space *mapping = inode->i_mapping; | |
819c4920 | 3694 | |
19b5ef61 TT |
3695 | /* |
3696 | * There is a possibility that we're either freeing the inode | |
3697 | * or it completely new indode. In those cases we might not | |
3698 | * have i_mutex locked because it's not necessary. | |
3699 | */ | |
3700 | if (!(inode->i_state & (I_NEW|I_FREEING))) | |
3701 | WARN_ON(!mutex_is_locked(&inode->i_mutex)); | |
0562e0ba JZ |
3702 | trace_ext4_truncate_enter(inode); |
3703 | ||
91ef4caf | 3704 | if (!ext4_can_truncate(inode)) |
ac27a0ec DK |
3705 | return; |
3706 | ||
12e9b892 | 3707 | ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS); |
c8d46e41 | 3708 | |
5534fb5b | 3709 | if (inode->i_size == 0 && !test_opt(inode->i_sb, NO_AUTO_DA_ALLOC)) |
19f5fb7a | 3710 | ext4_set_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE); |
7d8f9f7d | 3711 | |
aef1c851 TM |
3712 | if (ext4_has_inline_data(inode)) { |
3713 | int has_inline = 1; | |
3714 | ||
3715 | ext4_inline_data_truncate(inode, &has_inline); | |
3716 | if (has_inline) | |
3717 | return; | |
3718 | } | |
3719 | ||
a361293f JK |
3720 | /* If we zero-out tail of the page, we have to create jinode for jbd2 */ |
3721 | if (inode->i_size & (inode->i_sb->s_blocksize - 1)) { | |
3722 | if (ext4_inode_attach_jinode(inode) < 0) | |
3723 | return; | |
3724 | } | |
3725 | ||
819c4920 TT |
3726 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
3727 | credits = ext4_writepage_trans_blocks(inode); | |
3728 | else | |
3729 | credits = ext4_blocks_for_truncate(inode); | |
3730 | ||
3731 | handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits); | |
3732 | if (IS_ERR(handle)) { | |
3733 | ext4_std_error(inode->i_sb, PTR_ERR(handle)); | |
3734 | return; | |
3735 | } | |
3736 | ||
eb3544c6 LC |
3737 | if (inode->i_size & (inode->i_sb->s_blocksize - 1)) |
3738 | ext4_block_truncate_page(handle, mapping, inode->i_size); | |
819c4920 TT |
3739 | |
3740 | /* | |
3741 | * We add the inode to the orphan list, so that if this | |
3742 | * truncate spans multiple transactions, and we crash, we will | |
3743 | * resume the truncate when the filesystem recovers. It also | |
3744 | * marks the inode dirty, to catch the new size. | |
3745 | * | |
3746 | * Implication: the file must always be in a sane, consistent | |
3747 | * truncatable state while each transaction commits. | |
3748 | */ | |
3749 | if (ext4_orphan_add(handle, inode)) | |
3750 | goto out_stop; | |
3751 | ||
3752 | down_write(&EXT4_I(inode)->i_data_sem); | |
3753 | ||
3754 | ext4_discard_preallocations(inode); | |
3755 | ||
ff9893dc | 3756 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
819c4920 | 3757 | ext4_ext_truncate(handle, inode); |
ff9893dc | 3758 | else |
819c4920 TT |
3759 | ext4_ind_truncate(handle, inode); |
3760 | ||
3761 | up_write(&ei->i_data_sem); | |
3762 | ||
3763 | if (IS_SYNC(inode)) | |
3764 | ext4_handle_sync(handle); | |
3765 | ||
3766 | out_stop: | |
3767 | /* | |
3768 | * If this was a simple ftruncate() and the file will remain alive, | |
3769 | * then we need to clear up the orphan record which we created above. | |
3770 | * However, if this was a real unlink then we were called by | |
3771 | * ext4_delete_inode(), and we allow that function to clean up the | |
3772 | * orphan info for us. | |
3773 | */ | |
3774 | if (inode->i_nlink) | |
3775 | ext4_orphan_del(handle, inode); | |
3776 | ||
3777 | inode->i_mtime = inode->i_ctime = ext4_current_time(inode); | |
3778 | ext4_mark_inode_dirty(handle, inode); | |
3779 | ext4_journal_stop(handle); | |
ac27a0ec | 3780 | |
0562e0ba | 3781 | trace_ext4_truncate_exit(inode); |
ac27a0ec DK |
3782 | } |
3783 | ||
ac27a0ec | 3784 | /* |
617ba13b | 3785 | * ext4_get_inode_loc returns with an extra refcount against the inode's |
ac27a0ec DK |
3786 | * underlying buffer_head on success. If 'in_mem' is true, we have all |
3787 | * data in memory that is needed to recreate the on-disk version of this | |
3788 | * inode. | |
3789 | */ | |
617ba13b MC |
3790 | static int __ext4_get_inode_loc(struct inode *inode, |
3791 | struct ext4_iloc *iloc, int in_mem) | |
ac27a0ec | 3792 | { |
240799cd TT |
3793 | struct ext4_group_desc *gdp; |
3794 | struct buffer_head *bh; | |
3795 | struct super_block *sb = inode->i_sb; | |
3796 | ext4_fsblk_t block; | |
3797 | int inodes_per_block, inode_offset; | |
3798 | ||
3a06d778 | 3799 | iloc->bh = NULL; |
240799cd TT |
3800 | if (!ext4_valid_inum(sb, inode->i_ino)) |
3801 | return -EIO; | |
ac27a0ec | 3802 | |
240799cd TT |
3803 | iloc->block_group = (inode->i_ino - 1) / EXT4_INODES_PER_GROUP(sb); |
3804 | gdp = ext4_get_group_desc(sb, iloc->block_group, NULL); | |
3805 | if (!gdp) | |
ac27a0ec DK |
3806 | return -EIO; |
3807 | ||
240799cd TT |
3808 | /* |
3809 | * Figure out the offset within the block group inode table | |
3810 | */ | |
00d09882 | 3811 | inodes_per_block = EXT4_SB(sb)->s_inodes_per_block; |
240799cd TT |
3812 | inode_offset = ((inode->i_ino - 1) % |
3813 | EXT4_INODES_PER_GROUP(sb)); | |
3814 | block = ext4_inode_table(sb, gdp) + (inode_offset / inodes_per_block); | |
3815 | iloc->offset = (inode_offset % inodes_per_block) * EXT4_INODE_SIZE(sb); | |
3816 | ||
3817 | bh = sb_getblk(sb, block); | |
aebf0243 | 3818 | if (unlikely(!bh)) |
860d21e2 | 3819 | return -ENOMEM; |
ac27a0ec DK |
3820 | if (!buffer_uptodate(bh)) { |
3821 | lock_buffer(bh); | |
9c83a923 HK |
3822 | |
3823 | /* | |
3824 | * If the buffer has the write error flag, we have failed | |
3825 | * to write out another inode in the same block. In this | |
3826 | * case, we don't have to read the block because we may | |
3827 | * read the old inode data successfully. | |
3828 | */ | |
3829 | if (buffer_write_io_error(bh) && !buffer_uptodate(bh)) | |
3830 | set_buffer_uptodate(bh); | |
3831 | ||
ac27a0ec DK |
3832 | if (buffer_uptodate(bh)) { |
3833 | /* someone brought it uptodate while we waited */ | |
3834 | unlock_buffer(bh); | |
3835 | goto has_buffer; | |
3836 | } | |
3837 | ||
3838 | /* | |
3839 | * If we have all information of the inode in memory and this | |
3840 | * is the only valid inode in the block, we need not read the | |
3841 | * block. | |
3842 | */ | |
3843 | if (in_mem) { | |
3844 | struct buffer_head *bitmap_bh; | |
240799cd | 3845 | int i, start; |
ac27a0ec | 3846 | |
240799cd | 3847 | start = inode_offset & ~(inodes_per_block - 1); |
ac27a0ec | 3848 | |
240799cd TT |
3849 | /* Is the inode bitmap in cache? */ |
3850 | bitmap_bh = sb_getblk(sb, ext4_inode_bitmap(sb, gdp)); | |
aebf0243 | 3851 | if (unlikely(!bitmap_bh)) |
ac27a0ec DK |
3852 | goto make_io; |
3853 | ||
3854 | /* | |
3855 | * If the inode bitmap isn't in cache then the | |
3856 | * optimisation may end up performing two reads instead | |
3857 | * of one, so skip it. | |
3858 | */ | |
3859 | if (!buffer_uptodate(bitmap_bh)) { | |
3860 | brelse(bitmap_bh); | |
3861 | goto make_io; | |
3862 | } | |
240799cd | 3863 | for (i = start; i < start + inodes_per_block; i++) { |
ac27a0ec DK |
3864 | if (i == inode_offset) |
3865 | continue; | |
617ba13b | 3866 | if (ext4_test_bit(i, bitmap_bh->b_data)) |
ac27a0ec DK |
3867 | break; |
3868 | } | |
3869 | brelse(bitmap_bh); | |
240799cd | 3870 | if (i == start + inodes_per_block) { |
ac27a0ec DK |
3871 | /* all other inodes are free, so skip I/O */ |
3872 | memset(bh->b_data, 0, bh->b_size); | |
3873 | set_buffer_uptodate(bh); | |
3874 | unlock_buffer(bh); | |
3875 | goto has_buffer; | |
3876 | } | |
3877 | } | |
3878 | ||
3879 | make_io: | |
240799cd TT |
3880 | /* |
3881 | * If we need to do any I/O, try to pre-readahead extra | |
3882 | * blocks from the inode table. | |
3883 | */ | |
3884 | if (EXT4_SB(sb)->s_inode_readahead_blks) { | |
3885 | ext4_fsblk_t b, end, table; | |
3886 | unsigned num; | |
0d606e2c | 3887 | __u32 ra_blks = EXT4_SB(sb)->s_inode_readahead_blks; |
240799cd TT |
3888 | |
3889 | table = ext4_inode_table(sb, gdp); | |
b713a5ec | 3890 | /* s_inode_readahead_blks is always a power of 2 */ |
0d606e2c | 3891 | b = block & ~((ext4_fsblk_t) ra_blks - 1); |
240799cd TT |
3892 | if (table > b) |
3893 | b = table; | |
0d606e2c | 3894 | end = b + ra_blks; |
240799cd | 3895 | num = EXT4_INODES_PER_GROUP(sb); |
feb0ab32 | 3896 | if (ext4_has_group_desc_csum(sb)) |
560671a0 | 3897 | num -= ext4_itable_unused_count(sb, gdp); |
240799cd TT |
3898 | table += num / inodes_per_block; |
3899 | if (end > table) | |
3900 | end = table; | |
3901 | while (b <= end) | |
3902 | sb_breadahead(sb, b++); | |
3903 | } | |
3904 | ||
ac27a0ec DK |
3905 | /* |
3906 | * There are other valid inodes in the buffer, this inode | |
3907 | * has in-inode xattrs, or we don't have this inode in memory. | |
3908 | * Read the block from disk. | |
3909 | */ | |
0562e0ba | 3910 | trace_ext4_load_inode(inode); |
ac27a0ec DK |
3911 | get_bh(bh); |
3912 | bh->b_end_io = end_buffer_read_sync; | |
65299a3b | 3913 | submit_bh(READ | REQ_META | REQ_PRIO, bh); |
ac27a0ec DK |
3914 | wait_on_buffer(bh); |
3915 | if (!buffer_uptodate(bh)) { | |
c398eda0 TT |
3916 | EXT4_ERROR_INODE_BLOCK(inode, block, |
3917 | "unable to read itable block"); | |
ac27a0ec DK |
3918 | brelse(bh); |
3919 | return -EIO; | |
3920 | } | |
3921 | } | |
3922 | has_buffer: | |
3923 | iloc->bh = bh; | |
3924 | return 0; | |
3925 | } | |
3926 | ||
617ba13b | 3927 | int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc) |
ac27a0ec DK |
3928 | { |
3929 | /* We have all inode data except xattrs in memory here. */ | |
617ba13b | 3930 | return __ext4_get_inode_loc(inode, iloc, |
19f5fb7a | 3931 | !ext4_test_inode_state(inode, EXT4_STATE_XATTR)); |
ac27a0ec DK |
3932 | } |
3933 | ||
617ba13b | 3934 | void ext4_set_inode_flags(struct inode *inode) |
ac27a0ec | 3935 | { |
617ba13b | 3936 | unsigned int flags = EXT4_I(inode)->i_flags; |
ac27a0ec DK |
3937 | |
3938 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
617ba13b | 3939 | if (flags & EXT4_SYNC_FL) |
ac27a0ec | 3940 | inode->i_flags |= S_SYNC; |
617ba13b | 3941 | if (flags & EXT4_APPEND_FL) |
ac27a0ec | 3942 | inode->i_flags |= S_APPEND; |
617ba13b | 3943 | if (flags & EXT4_IMMUTABLE_FL) |
ac27a0ec | 3944 | inode->i_flags |= S_IMMUTABLE; |
617ba13b | 3945 | if (flags & EXT4_NOATIME_FL) |
ac27a0ec | 3946 | inode->i_flags |= S_NOATIME; |
617ba13b | 3947 | if (flags & EXT4_DIRSYNC_FL) |
ac27a0ec DK |
3948 | inode->i_flags |= S_DIRSYNC; |
3949 | } | |
3950 | ||
ff9ddf7e JK |
3951 | /* Propagate flags from i_flags to EXT4_I(inode)->i_flags */ |
3952 | void ext4_get_inode_flags(struct ext4_inode_info *ei) | |
3953 | { | |
84a8dce2 DM |
3954 | unsigned int vfs_fl; |
3955 | unsigned long old_fl, new_fl; | |
3956 | ||
3957 | do { | |
3958 | vfs_fl = ei->vfs_inode.i_flags; | |
3959 | old_fl = ei->i_flags; | |
3960 | new_fl = old_fl & ~(EXT4_SYNC_FL|EXT4_APPEND_FL| | |
3961 | EXT4_IMMUTABLE_FL|EXT4_NOATIME_FL| | |
3962 | EXT4_DIRSYNC_FL); | |
3963 | if (vfs_fl & S_SYNC) | |
3964 | new_fl |= EXT4_SYNC_FL; | |
3965 | if (vfs_fl & S_APPEND) | |
3966 | new_fl |= EXT4_APPEND_FL; | |
3967 | if (vfs_fl & S_IMMUTABLE) | |
3968 | new_fl |= EXT4_IMMUTABLE_FL; | |
3969 | if (vfs_fl & S_NOATIME) | |
3970 | new_fl |= EXT4_NOATIME_FL; | |
3971 | if (vfs_fl & S_DIRSYNC) | |
3972 | new_fl |= EXT4_DIRSYNC_FL; | |
3973 | } while (cmpxchg(&ei->i_flags, old_fl, new_fl) != old_fl); | |
ff9ddf7e | 3974 | } |
de9a55b8 | 3975 | |
0fc1b451 | 3976 | static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode, |
de9a55b8 | 3977 | struct ext4_inode_info *ei) |
0fc1b451 AK |
3978 | { |
3979 | blkcnt_t i_blocks ; | |
8180a562 AK |
3980 | struct inode *inode = &(ei->vfs_inode); |
3981 | struct super_block *sb = inode->i_sb; | |
0fc1b451 AK |
3982 | |
3983 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
3984 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { | |
3985 | /* we are using combined 48 bit field */ | |
3986 | i_blocks = ((u64)le16_to_cpu(raw_inode->i_blocks_high)) << 32 | | |
3987 | le32_to_cpu(raw_inode->i_blocks_lo); | |
07a03824 | 3988 | if (ext4_test_inode_flag(inode, EXT4_INODE_HUGE_FILE)) { |
8180a562 AK |
3989 | /* i_blocks represent file system block size */ |
3990 | return i_blocks << (inode->i_blkbits - 9); | |
3991 | } else { | |
3992 | return i_blocks; | |
3993 | } | |
0fc1b451 AK |
3994 | } else { |
3995 | return le32_to_cpu(raw_inode->i_blocks_lo); | |
3996 | } | |
3997 | } | |
ff9ddf7e | 3998 | |
152a7b0a TM |
3999 | static inline void ext4_iget_extra_inode(struct inode *inode, |
4000 | struct ext4_inode *raw_inode, | |
4001 | struct ext4_inode_info *ei) | |
4002 | { | |
4003 | __le32 *magic = (void *)raw_inode + | |
4004 | EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize; | |
67cf5b09 | 4005 | if (*magic == cpu_to_le32(EXT4_XATTR_MAGIC)) { |
152a7b0a | 4006 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
67cf5b09 | 4007 | ext4_find_inline_data_nolock(inode); |
f19d5870 TM |
4008 | } else |
4009 | EXT4_I(inode)->i_inline_off = 0; | |
152a7b0a TM |
4010 | } |
4011 | ||
1d1fe1ee | 4012 | struct inode *ext4_iget(struct super_block *sb, unsigned long ino) |
ac27a0ec | 4013 | { |
617ba13b MC |
4014 | struct ext4_iloc iloc; |
4015 | struct ext4_inode *raw_inode; | |
1d1fe1ee | 4016 | struct ext4_inode_info *ei; |
1d1fe1ee | 4017 | struct inode *inode; |
b436b9be | 4018 | journal_t *journal = EXT4_SB(sb)->s_journal; |
1d1fe1ee | 4019 | long ret; |
ac27a0ec | 4020 | int block; |
08cefc7a EB |
4021 | uid_t i_uid; |
4022 | gid_t i_gid; | |
ac27a0ec | 4023 | |
1d1fe1ee DH |
4024 | inode = iget_locked(sb, ino); |
4025 | if (!inode) | |
4026 | return ERR_PTR(-ENOMEM); | |
4027 | if (!(inode->i_state & I_NEW)) | |
4028 | return inode; | |
4029 | ||
4030 | ei = EXT4_I(inode); | |
7dc57615 | 4031 | iloc.bh = NULL; |
ac27a0ec | 4032 | |
1d1fe1ee DH |
4033 | ret = __ext4_get_inode_loc(inode, &iloc, 0); |
4034 | if (ret < 0) | |
ac27a0ec | 4035 | goto bad_inode; |
617ba13b | 4036 | raw_inode = ext4_raw_inode(&iloc); |
814525f4 DW |
4037 | |
4038 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) { | |
4039 | ei->i_extra_isize = le16_to_cpu(raw_inode->i_extra_isize); | |
4040 | if (EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize > | |
4041 | EXT4_INODE_SIZE(inode->i_sb)) { | |
4042 | EXT4_ERROR_INODE(inode, "bad extra_isize (%u != %u)", | |
4043 | EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize, | |
4044 | EXT4_INODE_SIZE(inode->i_sb)); | |
4045 | ret = -EIO; | |
4046 | goto bad_inode; | |
4047 | } | |
4048 | } else | |
4049 | ei->i_extra_isize = 0; | |
4050 | ||
4051 | /* Precompute checksum seed for inode metadata */ | |
4052 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
4053 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) { | |
4054 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
4055 | __u32 csum; | |
4056 | __le32 inum = cpu_to_le32(inode->i_ino); | |
4057 | __le32 gen = raw_inode->i_generation; | |
4058 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, | |
4059 | sizeof(inum)); | |
4060 | ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, | |
4061 | sizeof(gen)); | |
4062 | } | |
4063 | ||
4064 | if (!ext4_inode_csum_verify(inode, raw_inode, ei)) { | |
4065 | EXT4_ERROR_INODE(inode, "checksum invalid"); | |
4066 | ret = -EIO; | |
4067 | goto bad_inode; | |
4068 | } | |
4069 | ||
ac27a0ec | 4070 | inode->i_mode = le16_to_cpu(raw_inode->i_mode); |
08cefc7a EB |
4071 | i_uid = (uid_t)le16_to_cpu(raw_inode->i_uid_low); |
4072 | i_gid = (gid_t)le16_to_cpu(raw_inode->i_gid_low); | |
af5bc92d | 4073 | if (!(test_opt(inode->i_sb, NO_UID32))) { |
08cefc7a EB |
4074 | i_uid |= le16_to_cpu(raw_inode->i_uid_high) << 16; |
4075 | i_gid |= le16_to_cpu(raw_inode->i_gid_high) << 16; | |
ac27a0ec | 4076 | } |
08cefc7a EB |
4077 | i_uid_write(inode, i_uid); |
4078 | i_gid_write(inode, i_gid); | |
bfe86848 | 4079 | set_nlink(inode, le16_to_cpu(raw_inode->i_links_count)); |
ac27a0ec | 4080 | |
353eb83c | 4081 | ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */ |
67cf5b09 | 4082 | ei->i_inline_off = 0; |
ac27a0ec DK |
4083 | ei->i_dir_start_lookup = 0; |
4084 | ei->i_dtime = le32_to_cpu(raw_inode->i_dtime); | |
4085 | /* We now have enough fields to check if the inode was active or not. | |
4086 | * This is needed because nfsd might try to access dead inodes | |
4087 | * the test is that same one that e2fsck uses | |
4088 | * NeilBrown 1999oct15 | |
4089 | */ | |
4090 | if (inode->i_nlink == 0) { | |
393d1d1d DTB |
4091 | if ((inode->i_mode == 0 || |
4092 | !(EXT4_SB(inode->i_sb)->s_mount_state & EXT4_ORPHAN_FS)) && | |
4093 | ino != EXT4_BOOT_LOADER_INO) { | |
ac27a0ec | 4094 | /* this inode is deleted */ |
1d1fe1ee | 4095 | ret = -ESTALE; |
ac27a0ec DK |
4096 | goto bad_inode; |
4097 | } | |
4098 | /* The only unlinked inodes we let through here have | |
4099 | * valid i_mode and are being read by the orphan | |
4100 | * recovery code: that's fine, we're about to complete | |
393d1d1d DTB |
4101 | * the process of deleting those. |
4102 | * OR it is the EXT4_BOOT_LOADER_INO which is | |
4103 | * not initialized on a new filesystem. */ | |
ac27a0ec | 4104 | } |
ac27a0ec | 4105 | ei->i_flags = le32_to_cpu(raw_inode->i_flags); |
0fc1b451 | 4106 | inode->i_blocks = ext4_inode_blocks(raw_inode, ei); |
7973c0c1 | 4107 | ei->i_file_acl = le32_to_cpu(raw_inode->i_file_acl_lo); |
a9e81742 | 4108 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) |
a1ddeb7e BP |
4109 | ei->i_file_acl |= |
4110 | ((__u64)le16_to_cpu(raw_inode->i_file_acl_high)) << 32; | |
a48380f7 | 4111 | inode->i_size = ext4_isize(raw_inode); |
ac27a0ec | 4112 | ei->i_disksize = inode->i_size; |
a9e7f447 DM |
4113 | #ifdef CONFIG_QUOTA |
4114 | ei->i_reserved_quota = 0; | |
4115 | #endif | |
ac27a0ec DK |
4116 | inode->i_generation = le32_to_cpu(raw_inode->i_generation); |
4117 | ei->i_block_group = iloc.block_group; | |
a4912123 | 4118 | ei->i_last_alloc_group = ~0; |
ac27a0ec DK |
4119 | /* |
4120 | * NOTE! The in-memory inode i_data array is in little-endian order | |
4121 | * even on big-endian machines: we do NOT byteswap the block numbers! | |
4122 | */ | |
617ba13b | 4123 | for (block = 0; block < EXT4_N_BLOCKS; block++) |
ac27a0ec DK |
4124 | ei->i_data[block] = raw_inode->i_block[block]; |
4125 | INIT_LIST_HEAD(&ei->i_orphan); | |
4126 | ||
b436b9be JK |
4127 | /* |
4128 | * Set transaction id's of transactions that have to be committed | |
4129 | * to finish f[data]sync. We set them to currently running transaction | |
4130 | * as we cannot be sure that the inode or some of its metadata isn't | |
4131 | * part of the transaction - the inode could have been reclaimed and | |
4132 | * now it is reread from disk. | |
4133 | */ | |
4134 | if (journal) { | |
4135 | transaction_t *transaction; | |
4136 | tid_t tid; | |
4137 | ||
a931da6a | 4138 | read_lock(&journal->j_state_lock); |
b436b9be JK |
4139 | if (journal->j_running_transaction) |
4140 | transaction = journal->j_running_transaction; | |
4141 | else | |
4142 | transaction = journal->j_committing_transaction; | |
4143 | if (transaction) | |
4144 | tid = transaction->t_tid; | |
4145 | else | |
4146 | tid = journal->j_commit_sequence; | |
a931da6a | 4147 | read_unlock(&journal->j_state_lock); |
b436b9be JK |
4148 | ei->i_sync_tid = tid; |
4149 | ei->i_datasync_tid = tid; | |
4150 | } | |
4151 | ||
0040d987 | 4152 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) { |
ac27a0ec DK |
4153 | if (ei->i_extra_isize == 0) { |
4154 | /* The extra space is currently unused. Use it. */ | |
617ba13b MC |
4155 | ei->i_extra_isize = sizeof(struct ext4_inode) - |
4156 | EXT4_GOOD_OLD_INODE_SIZE; | |
ac27a0ec | 4157 | } else { |
152a7b0a | 4158 | ext4_iget_extra_inode(inode, raw_inode, ei); |
ac27a0ec | 4159 | } |
814525f4 | 4160 | } |
ac27a0ec | 4161 | |
ef7f3835 KS |
4162 | EXT4_INODE_GET_XTIME(i_ctime, inode, raw_inode); |
4163 | EXT4_INODE_GET_XTIME(i_mtime, inode, raw_inode); | |
4164 | EXT4_INODE_GET_XTIME(i_atime, inode, raw_inode); | |
4165 | EXT4_EINODE_GET_XTIME(i_crtime, ei, raw_inode); | |
4166 | ||
25ec56b5 JNC |
4167 | inode->i_version = le32_to_cpu(raw_inode->i_disk_version); |
4168 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) { | |
4169 | if (EXT4_FITS_IN_INODE(raw_inode, ei, i_version_hi)) | |
4170 | inode->i_version |= | |
4171 | (__u64)(le32_to_cpu(raw_inode->i_version_hi)) << 32; | |
4172 | } | |
4173 | ||
c4b5a614 | 4174 | ret = 0; |
485c26ec | 4175 | if (ei->i_file_acl && |
1032988c | 4176 | !ext4_data_block_valid(EXT4_SB(sb), ei->i_file_acl, 1)) { |
24676da4 TT |
4177 | EXT4_ERROR_INODE(inode, "bad extended attribute block %llu", |
4178 | ei->i_file_acl); | |
485c26ec TT |
4179 | ret = -EIO; |
4180 | goto bad_inode; | |
f19d5870 TM |
4181 | } else if (!ext4_has_inline_data(inode)) { |
4182 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { | |
4183 | if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
4184 | (S_ISLNK(inode->i_mode) && | |
4185 | !ext4_inode_is_fast_symlink(inode)))) | |
4186 | /* Validate extent which is part of inode */ | |
4187 | ret = ext4_ext_check_inode(inode); | |
4188 | } else if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
4189 | (S_ISLNK(inode->i_mode) && | |
4190 | !ext4_inode_is_fast_symlink(inode))) { | |
4191 | /* Validate block references which are part of inode */ | |
4192 | ret = ext4_ind_check_inode(inode); | |
4193 | } | |
fe2c8191 | 4194 | } |
567f3e9a | 4195 | if (ret) |
de9a55b8 | 4196 | goto bad_inode; |
7a262f7c | 4197 | |
ac27a0ec | 4198 | if (S_ISREG(inode->i_mode)) { |
617ba13b MC |
4199 | inode->i_op = &ext4_file_inode_operations; |
4200 | inode->i_fop = &ext4_file_operations; | |
4201 | ext4_set_aops(inode); | |
ac27a0ec | 4202 | } else if (S_ISDIR(inode->i_mode)) { |
617ba13b MC |
4203 | inode->i_op = &ext4_dir_inode_operations; |
4204 | inode->i_fop = &ext4_dir_operations; | |
ac27a0ec | 4205 | } else if (S_ISLNK(inode->i_mode)) { |
e83c1397 | 4206 | if (ext4_inode_is_fast_symlink(inode)) { |
617ba13b | 4207 | inode->i_op = &ext4_fast_symlink_inode_operations; |
e83c1397 DG |
4208 | nd_terminate_link(ei->i_data, inode->i_size, |
4209 | sizeof(ei->i_data) - 1); | |
4210 | } else { | |
617ba13b MC |
4211 | inode->i_op = &ext4_symlink_inode_operations; |
4212 | ext4_set_aops(inode); | |
ac27a0ec | 4213 | } |
563bdd61 TT |
4214 | } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || |
4215 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
617ba13b | 4216 | inode->i_op = &ext4_special_inode_operations; |
ac27a0ec DK |
4217 | if (raw_inode->i_block[0]) |
4218 | init_special_inode(inode, inode->i_mode, | |
4219 | old_decode_dev(le32_to_cpu(raw_inode->i_block[0]))); | |
4220 | else | |
4221 | init_special_inode(inode, inode->i_mode, | |
4222 | new_decode_dev(le32_to_cpu(raw_inode->i_block[1]))); | |
393d1d1d DTB |
4223 | } else if (ino == EXT4_BOOT_LOADER_INO) { |
4224 | make_bad_inode(inode); | |
563bdd61 | 4225 | } else { |
563bdd61 | 4226 | ret = -EIO; |
24676da4 | 4227 | EXT4_ERROR_INODE(inode, "bogus i_mode (%o)", inode->i_mode); |
563bdd61 | 4228 | goto bad_inode; |
ac27a0ec | 4229 | } |
af5bc92d | 4230 | brelse(iloc.bh); |
617ba13b | 4231 | ext4_set_inode_flags(inode); |
1d1fe1ee DH |
4232 | unlock_new_inode(inode); |
4233 | return inode; | |
ac27a0ec DK |
4234 | |
4235 | bad_inode: | |
567f3e9a | 4236 | brelse(iloc.bh); |
1d1fe1ee DH |
4237 | iget_failed(inode); |
4238 | return ERR_PTR(ret); | |
ac27a0ec DK |
4239 | } |
4240 | ||
0fc1b451 AK |
4241 | static int ext4_inode_blocks_set(handle_t *handle, |
4242 | struct ext4_inode *raw_inode, | |
4243 | struct ext4_inode_info *ei) | |
4244 | { | |
4245 | struct inode *inode = &(ei->vfs_inode); | |
4246 | u64 i_blocks = inode->i_blocks; | |
4247 | struct super_block *sb = inode->i_sb; | |
0fc1b451 AK |
4248 | |
4249 | if (i_blocks <= ~0U) { | |
4250 | /* | |
4907cb7b | 4251 | * i_blocks can be represented in a 32 bit variable |
0fc1b451 AK |
4252 | * as multiple of 512 bytes |
4253 | */ | |
8180a562 | 4254 | raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); |
0fc1b451 | 4255 | raw_inode->i_blocks_high = 0; |
84a8dce2 | 4256 | ext4_clear_inode_flag(inode, EXT4_INODE_HUGE_FILE); |
f287a1a5 TT |
4257 | return 0; |
4258 | } | |
4259 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) | |
4260 | return -EFBIG; | |
4261 | ||
4262 | if (i_blocks <= 0xffffffffffffULL) { | |
0fc1b451 AK |
4263 | /* |
4264 | * i_blocks can be represented in a 48 bit variable | |
4265 | * as multiple of 512 bytes | |
4266 | */ | |
8180a562 | 4267 | raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); |
0fc1b451 | 4268 | raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32); |
84a8dce2 | 4269 | ext4_clear_inode_flag(inode, EXT4_INODE_HUGE_FILE); |
0fc1b451 | 4270 | } else { |
84a8dce2 | 4271 | ext4_set_inode_flag(inode, EXT4_INODE_HUGE_FILE); |
8180a562 AK |
4272 | /* i_block is stored in file system block size */ |
4273 | i_blocks = i_blocks >> (inode->i_blkbits - 9); | |
4274 | raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); | |
4275 | raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32); | |
0fc1b451 | 4276 | } |
f287a1a5 | 4277 | return 0; |
0fc1b451 AK |
4278 | } |
4279 | ||
ac27a0ec DK |
4280 | /* |
4281 | * Post the struct inode info into an on-disk inode location in the | |
4282 | * buffer-cache. This gobbles the caller's reference to the | |
4283 | * buffer_head in the inode location struct. | |
4284 | * | |
4285 | * The caller must have write access to iloc->bh. | |
4286 | */ | |
617ba13b | 4287 | static int ext4_do_update_inode(handle_t *handle, |
ac27a0ec | 4288 | struct inode *inode, |
830156c7 | 4289 | struct ext4_iloc *iloc) |
ac27a0ec | 4290 | { |
617ba13b MC |
4291 | struct ext4_inode *raw_inode = ext4_raw_inode(iloc); |
4292 | struct ext4_inode_info *ei = EXT4_I(inode); | |
ac27a0ec DK |
4293 | struct buffer_head *bh = iloc->bh; |
4294 | int err = 0, rc, block; | |
b71fc079 | 4295 | int need_datasync = 0; |
08cefc7a EB |
4296 | uid_t i_uid; |
4297 | gid_t i_gid; | |
ac27a0ec DK |
4298 | |
4299 | /* For fields not not tracking in the in-memory inode, | |
4300 | * initialise them to zero for new inodes. */ | |
19f5fb7a | 4301 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) |
617ba13b | 4302 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); |
ac27a0ec | 4303 | |
ff9ddf7e | 4304 | ext4_get_inode_flags(ei); |
ac27a0ec | 4305 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); |
08cefc7a EB |
4306 | i_uid = i_uid_read(inode); |
4307 | i_gid = i_gid_read(inode); | |
af5bc92d | 4308 | if (!(test_opt(inode->i_sb, NO_UID32))) { |
08cefc7a EB |
4309 | raw_inode->i_uid_low = cpu_to_le16(low_16_bits(i_uid)); |
4310 | raw_inode->i_gid_low = cpu_to_le16(low_16_bits(i_gid)); | |
ac27a0ec DK |
4311 | /* |
4312 | * Fix up interoperability with old kernels. Otherwise, old inodes get | |
4313 | * re-used with the upper 16 bits of the uid/gid intact | |
4314 | */ | |
af5bc92d | 4315 | if (!ei->i_dtime) { |
ac27a0ec | 4316 | raw_inode->i_uid_high = |
08cefc7a | 4317 | cpu_to_le16(high_16_bits(i_uid)); |
ac27a0ec | 4318 | raw_inode->i_gid_high = |
08cefc7a | 4319 | cpu_to_le16(high_16_bits(i_gid)); |
ac27a0ec DK |
4320 | } else { |
4321 | raw_inode->i_uid_high = 0; | |
4322 | raw_inode->i_gid_high = 0; | |
4323 | } | |
4324 | } else { | |
08cefc7a EB |
4325 | raw_inode->i_uid_low = cpu_to_le16(fs_high2lowuid(i_uid)); |
4326 | raw_inode->i_gid_low = cpu_to_le16(fs_high2lowgid(i_gid)); | |
ac27a0ec DK |
4327 | raw_inode->i_uid_high = 0; |
4328 | raw_inode->i_gid_high = 0; | |
4329 | } | |
4330 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); | |
ef7f3835 KS |
4331 | |
4332 | EXT4_INODE_SET_XTIME(i_ctime, inode, raw_inode); | |
4333 | EXT4_INODE_SET_XTIME(i_mtime, inode, raw_inode); | |
4334 | EXT4_INODE_SET_XTIME(i_atime, inode, raw_inode); | |
4335 | EXT4_EINODE_SET_XTIME(i_crtime, ei, raw_inode); | |
4336 | ||
0fc1b451 AK |
4337 | if (ext4_inode_blocks_set(handle, raw_inode, ei)) |
4338 | goto out_brelse; | |
ac27a0ec | 4339 | raw_inode->i_dtime = cpu_to_le32(ei->i_dtime); |
353eb83c | 4340 | raw_inode->i_flags = cpu_to_le32(ei->i_flags & 0xFFFFFFFF); |
9b8f1f01 MC |
4341 | if (EXT4_SB(inode->i_sb)->s_es->s_creator_os != |
4342 | cpu_to_le32(EXT4_OS_HURD)) | |
a1ddeb7e BP |
4343 | raw_inode->i_file_acl_high = |
4344 | cpu_to_le16(ei->i_file_acl >> 32); | |
7973c0c1 | 4345 | raw_inode->i_file_acl_lo = cpu_to_le32(ei->i_file_acl); |
b71fc079 JK |
4346 | if (ei->i_disksize != ext4_isize(raw_inode)) { |
4347 | ext4_isize_set(raw_inode, ei->i_disksize); | |
4348 | need_datasync = 1; | |
4349 | } | |
a48380f7 AK |
4350 | if (ei->i_disksize > 0x7fffffffULL) { |
4351 | struct super_block *sb = inode->i_sb; | |
4352 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
4353 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE) || | |
4354 | EXT4_SB(sb)->s_es->s_rev_level == | |
4355 | cpu_to_le32(EXT4_GOOD_OLD_REV)) { | |
4356 | /* If this is the first large file | |
4357 | * created, add a flag to the superblock. | |
4358 | */ | |
4359 | err = ext4_journal_get_write_access(handle, | |
4360 | EXT4_SB(sb)->s_sbh); | |
4361 | if (err) | |
4362 | goto out_brelse; | |
4363 | ext4_update_dynamic_rev(sb); | |
4364 | EXT4_SET_RO_COMPAT_FEATURE(sb, | |
617ba13b | 4365 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE); |
0390131b | 4366 | ext4_handle_sync(handle); |
b50924c2 | 4367 | err = ext4_handle_dirty_super(handle, sb); |
ac27a0ec DK |
4368 | } |
4369 | } | |
4370 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); | |
4371 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
4372 | if (old_valid_dev(inode->i_rdev)) { | |
4373 | raw_inode->i_block[0] = | |
4374 | cpu_to_le32(old_encode_dev(inode->i_rdev)); | |
4375 | raw_inode->i_block[1] = 0; | |
4376 | } else { | |
4377 | raw_inode->i_block[0] = 0; | |
4378 | raw_inode->i_block[1] = | |
4379 | cpu_to_le32(new_encode_dev(inode->i_rdev)); | |
4380 | raw_inode->i_block[2] = 0; | |
4381 | } | |
f19d5870 | 4382 | } else if (!ext4_has_inline_data(inode)) { |
de9a55b8 TT |
4383 | for (block = 0; block < EXT4_N_BLOCKS; block++) |
4384 | raw_inode->i_block[block] = ei->i_data[block]; | |
f19d5870 | 4385 | } |
ac27a0ec | 4386 | |
25ec56b5 JNC |
4387 | raw_inode->i_disk_version = cpu_to_le32(inode->i_version); |
4388 | if (ei->i_extra_isize) { | |
4389 | if (EXT4_FITS_IN_INODE(raw_inode, ei, i_version_hi)) | |
4390 | raw_inode->i_version_hi = | |
4391 | cpu_to_le32(inode->i_version >> 32); | |
ac27a0ec | 4392 | raw_inode->i_extra_isize = cpu_to_le16(ei->i_extra_isize); |
25ec56b5 JNC |
4393 | } |
4394 | ||
814525f4 DW |
4395 | ext4_inode_csum_set(inode, raw_inode, ei); |
4396 | ||
830156c7 | 4397 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); |
73b50c1c | 4398 | rc = ext4_handle_dirty_metadata(handle, NULL, bh); |
830156c7 FM |
4399 | if (!err) |
4400 | err = rc; | |
19f5fb7a | 4401 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec | 4402 | |
b71fc079 | 4403 | ext4_update_inode_fsync_trans(handle, inode, need_datasync); |
ac27a0ec | 4404 | out_brelse: |
af5bc92d | 4405 | brelse(bh); |
617ba13b | 4406 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
4407 | return err; |
4408 | } | |
4409 | ||
4410 | /* | |
617ba13b | 4411 | * ext4_write_inode() |
ac27a0ec DK |
4412 | * |
4413 | * We are called from a few places: | |
4414 | * | |
4415 | * - Within generic_file_write() for O_SYNC files. | |
4416 | * Here, there will be no transaction running. We wait for any running | |
4907cb7b | 4417 | * transaction to commit. |
ac27a0ec DK |
4418 | * |
4419 | * - Within sys_sync(), kupdate and such. | |
4420 | * We wait on commit, if tol to. | |
4421 | * | |
4422 | * - Within prune_icache() (PF_MEMALLOC == true) | |
4423 | * Here we simply return. We can't afford to block kswapd on the | |
4424 | * journal commit. | |
4425 | * | |
4426 | * In all cases it is actually safe for us to return without doing anything, | |
4427 | * because the inode has been copied into a raw inode buffer in | |
617ba13b | 4428 | * ext4_mark_inode_dirty(). This is a correctness thing for O_SYNC and for |
ac27a0ec DK |
4429 | * knfsd. |
4430 | * | |
4431 | * Note that we are absolutely dependent upon all inode dirtiers doing the | |
4432 | * right thing: they *must* call mark_inode_dirty() after dirtying info in | |
4433 | * which we are interested. | |
4434 | * | |
4435 | * It would be a bug for them to not do this. The code: | |
4436 | * | |
4437 | * mark_inode_dirty(inode) | |
4438 | * stuff(); | |
4439 | * inode->i_size = expr; | |
4440 | * | |
4441 | * is in error because a kswapd-driven write_inode() could occur while | |
4442 | * `stuff()' is running, and the new i_size will be lost. Plus the inode | |
4443 | * will no longer be on the superblock's dirty inode list. | |
4444 | */ | |
a9185b41 | 4445 | int ext4_write_inode(struct inode *inode, struct writeback_control *wbc) |
ac27a0ec | 4446 | { |
91ac6f43 FM |
4447 | int err; |
4448 | ||
ac27a0ec DK |
4449 | if (current->flags & PF_MEMALLOC) |
4450 | return 0; | |
4451 | ||
91ac6f43 FM |
4452 | if (EXT4_SB(inode->i_sb)->s_journal) { |
4453 | if (ext4_journal_current_handle()) { | |
4454 | jbd_debug(1, "called recursively, non-PF_MEMALLOC!\n"); | |
4455 | dump_stack(); | |
4456 | return -EIO; | |
4457 | } | |
ac27a0ec | 4458 | |
a9185b41 | 4459 | if (wbc->sync_mode != WB_SYNC_ALL) |
91ac6f43 FM |
4460 | return 0; |
4461 | ||
4462 | err = ext4_force_commit(inode->i_sb); | |
4463 | } else { | |
4464 | struct ext4_iloc iloc; | |
ac27a0ec | 4465 | |
8b472d73 | 4466 | err = __ext4_get_inode_loc(inode, &iloc, 0); |
91ac6f43 FM |
4467 | if (err) |
4468 | return err; | |
a9185b41 | 4469 | if (wbc->sync_mode == WB_SYNC_ALL) |
830156c7 FM |
4470 | sync_dirty_buffer(iloc.bh); |
4471 | if (buffer_req(iloc.bh) && !buffer_uptodate(iloc.bh)) { | |
c398eda0 TT |
4472 | EXT4_ERROR_INODE_BLOCK(inode, iloc.bh->b_blocknr, |
4473 | "IO error syncing inode"); | |
830156c7 FM |
4474 | err = -EIO; |
4475 | } | |
fd2dd9fb | 4476 | brelse(iloc.bh); |
91ac6f43 FM |
4477 | } |
4478 | return err; | |
ac27a0ec DK |
4479 | } |
4480 | ||
53e87268 JK |
4481 | /* |
4482 | * In data=journal mode ext4_journalled_invalidatepage() may fail to invalidate | |
4483 | * buffers that are attached to a page stradding i_size and are undergoing | |
4484 | * commit. In that case we have to wait for commit to finish and try again. | |
4485 | */ | |
4486 | static void ext4_wait_for_tail_page_commit(struct inode *inode) | |
4487 | { | |
4488 | struct page *page; | |
4489 | unsigned offset; | |
4490 | journal_t *journal = EXT4_SB(inode->i_sb)->s_journal; | |
4491 | tid_t commit_tid = 0; | |
4492 | int ret; | |
4493 | ||
4494 | offset = inode->i_size & (PAGE_CACHE_SIZE - 1); | |
4495 | /* | |
4496 | * All buffers in the last page remain valid? Then there's nothing to | |
4497 | * do. We do the check mainly to optimize the common PAGE_CACHE_SIZE == | |
4498 | * blocksize case | |
4499 | */ | |
4500 | if (offset > PAGE_CACHE_SIZE - (1 << inode->i_blkbits)) | |
4501 | return; | |
4502 | while (1) { | |
4503 | page = find_lock_page(inode->i_mapping, | |
4504 | inode->i_size >> PAGE_CACHE_SHIFT); | |
4505 | if (!page) | |
4506 | return; | |
ca99fdd2 LC |
4507 | ret = __ext4_journalled_invalidatepage(page, offset, |
4508 | PAGE_CACHE_SIZE - offset); | |
53e87268 JK |
4509 | unlock_page(page); |
4510 | page_cache_release(page); | |
4511 | if (ret != -EBUSY) | |
4512 | return; | |
4513 | commit_tid = 0; | |
4514 | read_lock(&journal->j_state_lock); | |
4515 | if (journal->j_committing_transaction) | |
4516 | commit_tid = journal->j_committing_transaction->t_tid; | |
4517 | read_unlock(&journal->j_state_lock); | |
4518 | if (commit_tid) | |
4519 | jbd2_log_wait_commit(journal, commit_tid); | |
4520 | } | |
4521 | } | |
4522 | ||
ac27a0ec | 4523 | /* |
617ba13b | 4524 | * ext4_setattr() |
ac27a0ec DK |
4525 | * |
4526 | * Called from notify_change. | |
4527 | * | |
4528 | * We want to trap VFS attempts to truncate the file as soon as | |
4529 | * possible. In particular, we want to make sure that when the VFS | |
4530 | * shrinks i_size, we put the inode on the orphan list and modify | |
4531 | * i_disksize immediately, so that during the subsequent flushing of | |
4532 | * dirty pages and freeing of disk blocks, we can guarantee that any | |
4533 | * commit will leave the blocks being flushed in an unused state on | |
4534 | * disk. (On recovery, the inode will get truncated and the blocks will | |
4535 | * be freed, so we have a strong guarantee that no future commit will | |
4536 | * leave these blocks visible to the user.) | |
4537 | * | |
678aaf48 JK |
4538 | * Another thing we have to assure is that if we are in ordered mode |
4539 | * and inode is still attached to the committing transaction, we must | |
4540 | * we start writeout of all the dirty pages which are being truncated. | |
4541 | * This way we are sure that all the data written in the previous | |
4542 | * transaction are already on disk (truncate waits for pages under | |
4543 | * writeback). | |
4544 | * | |
4545 | * Called with inode->i_mutex down. | |
ac27a0ec | 4546 | */ |
617ba13b | 4547 | int ext4_setattr(struct dentry *dentry, struct iattr *attr) |
ac27a0ec DK |
4548 | { |
4549 | struct inode *inode = dentry->d_inode; | |
4550 | int error, rc = 0; | |
3d287de3 | 4551 | int orphan = 0; |
ac27a0ec DK |
4552 | const unsigned int ia_valid = attr->ia_valid; |
4553 | ||
4554 | error = inode_change_ok(inode, attr); | |
4555 | if (error) | |
4556 | return error; | |
4557 | ||
12755627 | 4558 | if (is_quota_modification(inode, attr)) |
871a2931 | 4559 | dquot_initialize(inode); |
08cefc7a EB |
4560 | if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) || |
4561 | (ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) { | |
ac27a0ec DK |
4562 | handle_t *handle; |
4563 | ||
4564 | /* (user+group)*(old+new) structure, inode write (sb, | |
4565 | * inode block, ? - but truncate inode update has it) */ | |
9924a92a TT |
4566 | handle = ext4_journal_start(inode, EXT4_HT_QUOTA, |
4567 | (EXT4_MAXQUOTAS_INIT_BLOCKS(inode->i_sb) + | |
4568 | EXT4_MAXQUOTAS_DEL_BLOCKS(inode->i_sb)) + 3); | |
ac27a0ec DK |
4569 | if (IS_ERR(handle)) { |
4570 | error = PTR_ERR(handle); | |
4571 | goto err_out; | |
4572 | } | |
b43fa828 | 4573 | error = dquot_transfer(inode, attr); |
ac27a0ec | 4574 | if (error) { |
617ba13b | 4575 | ext4_journal_stop(handle); |
ac27a0ec DK |
4576 | return error; |
4577 | } | |
4578 | /* Update corresponding info in inode so that everything is in | |
4579 | * one transaction */ | |
4580 | if (attr->ia_valid & ATTR_UID) | |
4581 | inode->i_uid = attr->ia_uid; | |
4582 | if (attr->ia_valid & ATTR_GID) | |
4583 | inode->i_gid = attr->ia_gid; | |
617ba13b MC |
4584 | error = ext4_mark_inode_dirty(handle, inode); |
4585 | ext4_journal_stop(handle); | |
ac27a0ec DK |
4586 | } |
4587 | ||
5208386c JK |
4588 | if (attr->ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) { |
4589 | handle_t *handle; | |
562c72aa | 4590 | |
12e9b892 | 4591 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) { |
e2b46574 ES |
4592 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
4593 | ||
0c095c7f TT |
4594 | if (attr->ia_size > sbi->s_bitmap_maxbytes) |
4595 | return -EFBIG; | |
e2b46574 | 4596 | } |
5208386c JK |
4597 | if (S_ISREG(inode->i_mode) && |
4598 | (attr->ia_size < inode->i_size)) { | |
4599 | if (ext4_should_order_data(inode)) { | |
4600 | error = ext4_begin_ordered_truncate(inode, | |
678aaf48 | 4601 | attr->ia_size); |
5208386c | 4602 | if (error) |
678aaf48 | 4603 | goto err_out; |
5208386c JK |
4604 | } |
4605 | handle = ext4_journal_start(inode, EXT4_HT_INODE, 3); | |
4606 | if (IS_ERR(handle)) { | |
4607 | error = PTR_ERR(handle); | |
4608 | goto err_out; | |
4609 | } | |
4610 | if (ext4_handle_valid(handle)) { | |
4611 | error = ext4_orphan_add(handle, inode); | |
4612 | orphan = 1; | |
4613 | } | |
90e775b7 | 4614 | down_write(&EXT4_I(inode)->i_data_sem); |
5208386c JK |
4615 | EXT4_I(inode)->i_disksize = attr->ia_size; |
4616 | rc = ext4_mark_inode_dirty(handle, inode); | |
4617 | if (!error) | |
4618 | error = rc; | |
90e775b7 JK |
4619 | /* |
4620 | * We have to update i_size under i_data_sem together | |
4621 | * with i_disksize to avoid races with writeback code | |
4622 | * running ext4_wb_update_i_disksize(). | |
4623 | */ | |
4624 | if (!error) | |
4625 | i_size_write(inode, attr->ia_size); | |
4626 | up_write(&EXT4_I(inode)->i_data_sem); | |
5208386c JK |
4627 | ext4_journal_stop(handle); |
4628 | if (error) { | |
4629 | ext4_orphan_del(NULL, inode); | |
678aaf48 JK |
4630 | goto err_out; |
4631 | } | |
90e775b7 JK |
4632 | } else |
4633 | i_size_write(inode, attr->ia_size); | |
53e87268 | 4634 | |
5208386c JK |
4635 | /* |
4636 | * Blocks are going to be removed from the inode. Wait | |
4637 | * for dio in flight. Temporarily disable | |
4638 | * dioread_nolock to prevent livelock. | |
4639 | */ | |
4640 | if (orphan) { | |
4641 | if (!ext4_should_journal_data(inode)) { | |
4642 | ext4_inode_block_unlocked_dio(inode); | |
4643 | inode_dio_wait(inode); | |
4644 | ext4_inode_resume_unlocked_dio(inode); | |
4645 | } else | |
4646 | ext4_wait_for_tail_page_commit(inode); | |
1c9114f9 | 4647 | } |
5208386c JK |
4648 | /* |
4649 | * Truncate pagecache after we've waited for commit | |
4650 | * in data=journal mode to make pages freeable. | |
4651 | */ | |
7caef267 | 4652 | truncate_pagecache(inode, inode->i_size); |
072bd7ea | 4653 | } |
5208386c JK |
4654 | /* |
4655 | * We want to call ext4_truncate() even if attr->ia_size == | |
4656 | * inode->i_size for cases like truncation of fallocated space | |
4657 | */ | |
4658 | if (attr->ia_valid & ATTR_SIZE) | |
4659 | ext4_truncate(inode); | |
ac27a0ec | 4660 | |
1025774c CH |
4661 | if (!rc) { |
4662 | setattr_copy(inode, attr); | |
4663 | mark_inode_dirty(inode); | |
4664 | } | |
4665 | ||
4666 | /* | |
4667 | * If the call to ext4_truncate failed to get a transaction handle at | |
4668 | * all, we need to clean up the in-core orphan list manually. | |
4669 | */ | |
3d287de3 | 4670 | if (orphan && inode->i_nlink) |
617ba13b | 4671 | ext4_orphan_del(NULL, inode); |
ac27a0ec DK |
4672 | |
4673 | if (!rc && (ia_valid & ATTR_MODE)) | |
617ba13b | 4674 | rc = ext4_acl_chmod(inode); |
ac27a0ec DK |
4675 | |
4676 | err_out: | |
617ba13b | 4677 | ext4_std_error(inode->i_sb, error); |
ac27a0ec DK |
4678 | if (!error) |
4679 | error = rc; | |
4680 | return error; | |
4681 | } | |
4682 | ||
3e3398a0 MC |
4683 | int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, |
4684 | struct kstat *stat) | |
4685 | { | |
4686 | struct inode *inode; | |
8af8eecc | 4687 | unsigned long long delalloc_blocks; |
3e3398a0 MC |
4688 | |
4689 | inode = dentry->d_inode; | |
4690 | generic_fillattr(inode, stat); | |
4691 | ||
4692 | /* | |
4693 | * We can't update i_blocks if the block allocation is delayed | |
4694 | * otherwise in the case of system crash before the real block | |
4695 | * allocation is done, we will have i_blocks inconsistent with | |
4696 | * on-disk file blocks. | |
4697 | * We always keep i_blocks updated together with real | |
4698 | * allocation. But to not confuse with user, stat | |
4699 | * will return the blocks that include the delayed allocation | |
4700 | * blocks for this file. | |
4701 | */ | |
96607551 TM |
4702 | delalloc_blocks = EXT4_C2B(EXT4_SB(inode->i_sb), |
4703 | EXT4_I(inode)->i_reserved_data_blocks); | |
3e3398a0 | 4704 | |
8af8eecc | 4705 | stat->blocks += delalloc_blocks << (inode->i_sb->s_blocksize_bits-9); |
3e3398a0 MC |
4706 | return 0; |
4707 | } | |
ac27a0ec | 4708 | |
fffb2739 JK |
4709 | static int ext4_index_trans_blocks(struct inode *inode, int lblocks, |
4710 | int pextents) | |
a02908f1 | 4711 | { |
12e9b892 | 4712 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fffb2739 JK |
4713 | return ext4_ind_trans_blocks(inode, lblocks); |
4714 | return ext4_ext_index_trans_blocks(inode, pextents); | |
a02908f1 | 4715 | } |
ac51d837 | 4716 | |
ac27a0ec | 4717 | /* |
a02908f1 MC |
4718 | * Account for index blocks, block groups bitmaps and block group |
4719 | * descriptor blocks if modify datablocks and index blocks | |
4720 | * worse case, the indexs blocks spread over different block groups | |
ac27a0ec | 4721 | * |
a02908f1 | 4722 | * If datablocks are discontiguous, they are possible to spread over |
4907cb7b | 4723 | * different block groups too. If they are contiguous, with flexbg, |
a02908f1 | 4724 | * they could still across block group boundary. |
ac27a0ec | 4725 | * |
a02908f1 MC |
4726 | * Also account for superblock, inode, quota and xattr blocks |
4727 | */ | |
fffb2739 JK |
4728 | static int ext4_meta_trans_blocks(struct inode *inode, int lblocks, |
4729 | int pextents) | |
a02908f1 | 4730 | { |
8df9675f TT |
4731 | ext4_group_t groups, ngroups = ext4_get_groups_count(inode->i_sb); |
4732 | int gdpblocks; | |
a02908f1 MC |
4733 | int idxblocks; |
4734 | int ret = 0; | |
4735 | ||
4736 | /* | |
fffb2739 JK |
4737 | * How many index blocks need to touch to map @lblocks logical blocks |
4738 | * to @pextents physical extents? | |
a02908f1 | 4739 | */ |
fffb2739 | 4740 | idxblocks = ext4_index_trans_blocks(inode, lblocks, pextents); |
a02908f1 MC |
4741 | |
4742 | ret = idxblocks; | |
4743 | ||
4744 | /* | |
4745 | * Now let's see how many group bitmaps and group descriptors need | |
4746 | * to account | |
4747 | */ | |
fffb2739 | 4748 | groups = idxblocks + pextents; |
a02908f1 | 4749 | gdpblocks = groups; |
8df9675f TT |
4750 | if (groups > ngroups) |
4751 | groups = ngroups; | |
a02908f1 MC |
4752 | if (groups > EXT4_SB(inode->i_sb)->s_gdb_count) |
4753 | gdpblocks = EXT4_SB(inode->i_sb)->s_gdb_count; | |
4754 | ||
4755 | /* bitmaps and block group descriptor blocks */ | |
4756 | ret += groups + gdpblocks; | |
4757 | ||
4758 | /* Blocks for super block, inode, quota and xattr blocks */ | |
4759 | ret += EXT4_META_TRANS_BLOCKS(inode->i_sb); | |
4760 | ||
4761 | return ret; | |
4762 | } | |
4763 | ||
4764 | /* | |
25985edc | 4765 | * Calculate the total number of credits to reserve to fit |
f3bd1f3f MC |
4766 | * the modification of a single pages into a single transaction, |
4767 | * which may include multiple chunks of block allocations. | |
ac27a0ec | 4768 | * |
525f4ed8 | 4769 | * This could be called via ext4_write_begin() |
ac27a0ec | 4770 | * |
525f4ed8 | 4771 | * We need to consider the worse case, when |
a02908f1 | 4772 | * one new block per extent. |
ac27a0ec | 4773 | */ |
a86c6181 | 4774 | int ext4_writepage_trans_blocks(struct inode *inode) |
ac27a0ec | 4775 | { |
617ba13b | 4776 | int bpp = ext4_journal_blocks_per_page(inode); |
ac27a0ec DK |
4777 | int ret; |
4778 | ||
fffb2739 | 4779 | ret = ext4_meta_trans_blocks(inode, bpp, bpp); |
a86c6181 | 4780 | |
a02908f1 | 4781 | /* Account for data blocks for journalled mode */ |
617ba13b | 4782 | if (ext4_should_journal_data(inode)) |
a02908f1 | 4783 | ret += bpp; |
ac27a0ec DK |
4784 | return ret; |
4785 | } | |
f3bd1f3f MC |
4786 | |
4787 | /* | |
4788 | * Calculate the journal credits for a chunk of data modification. | |
4789 | * | |
4790 | * This is called from DIO, fallocate or whoever calling | |
79e83036 | 4791 | * ext4_map_blocks() to map/allocate a chunk of contiguous disk blocks. |
f3bd1f3f MC |
4792 | * |
4793 | * journal buffers for data blocks are not included here, as DIO | |
4794 | * and fallocate do no need to journal data buffers. | |
4795 | */ | |
4796 | int ext4_chunk_trans_blocks(struct inode *inode, int nrblocks) | |
4797 | { | |
4798 | return ext4_meta_trans_blocks(inode, nrblocks, 1); | |
4799 | } | |
4800 | ||
ac27a0ec | 4801 | /* |
617ba13b | 4802 | * The caller must have previously called ext4_reserve_inode_write(). |
ac27a0ec DK |
4803 | * Give this, we know that the caller already has write access to iloc->bh. |
4804 | */ | |
617ba13b | 4805 | int ext4_mark_iloc_dirty(handle_t *handle, |
de9a55b8 | 4806 | struct inode *inode, struct ext4_iloc *iloc) |
ac27a0ec DK |
4807 | { |
4808 | int err = 0; | |
4809 | ||
c64db50e | 4810 | if (IS_I_VERSION(inode)) |
25ec56b5 JNC |
4811 | inode_inc_iversion(inode); |
4812 | ||
ac27a0ec DK |
4813 | /* the do_update_inode consumes one bh->b_count */ |
4814 | get_bh(iloc->bh); | |
4815 | ||
dab291af | 4816 | /* ext4_do_update_inode() does jbd2_journal_dirty_metadata */ |
830156c7 | 4817 | err = ext4_do_update_inode(handle, inode, iloc); |
ac27a0ec DK |
4818 | put_bh(iloc->bh); |
4819 | return err; | |
4820 | } | |
4821 | ||
4822 | /* | |
4823 | * On success, We end up with an outstanding reference count against | |
4824 | * iloc->bh. This _must_ be cleaned up later. | |
4825 | */ | |
4826 | ||
4827 | int | |
617ba13b MC |
4828 | ext4_reserve_inode_write(handle_t *handle, struct inode *inode, |
4829 | struct ext4_iloc *iloc) | |
ac27a0ec | 4830 | { |
0390131b FM |
4831 | int err; |
4832 | ||
4833 | err = ext4_get_inode_loc(inode, iloc); | |
4834 | if (!err) { | |
4835 | BUFFER_TRACE(iloc->bh, "get_write_access"); | |
4836 | err = ext4_journal_get_write_access(handle, iloc->bh); | |
4837 | if (err) { | |
4838 | brelse(iloc->bh); | |
4839 | iloc->bh = NULL; | |
ac27a0ec DK |
4840 | } |
4841 | } | |
617ba13b | 4842 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
4843 | return err; |
4844 | } | |
4845 | ||
6dd4ee7c KS |
4846 | /* |
4847 | * Expand an inode by new_extra_isize bytes. | |
4848 | * Returns 0 on success or negative error number on failure. | |
4849 | */ | |
1d03ec98 AK |
4850 | static int ext4_expand_extra_isize(struct inode *inode, |
4851 | unsigned int new_extra_isize, | |
4852 | struct ext4_iloc iloc, | |
4853 | handle_t *handle) | |
6dd4ee7c KS |
4854 | { |
4855 | struct ext4_inode *raw_inode; | |
4856 | struct ext4_xattr_ibody_header *header; | |
6dd4ee7c KS |
4857 | |
4858 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) | |
4859 | return 0; | |
4860 | ||
4861 | raw_inode = ext4_raw_inode(&iloc); | |
4862 | ||
4863 | header = IHDR(inode, raw_inode); | |
6dd4ee7c KS |
4864 | |
4865 | /* No extended attributes present */ | |
19f5fb7a TT |
4866 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR) || |
4867 | header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)) { | |
6dd4ee7c KS |
4868 | memset((void *)raw_inode + EXT4_GOOD_OLD_INODE_SIZE, 0, |
4869 | new_extra_isize); | |
4870 | EXT4_I(inode)->i_extra_isize = new_extra_isize; | |
4871 | return 0; | |
4872 | } | |
4873 | ||
4874 | /* try to expand with EAs present */ | |
4875 | return ext4_expand_extra_isize_ea(inode, new_extra_isize, | |
4876 | raw_inode, handle); | |
4877 | } | |
4878 | ||
ac27a0ec DK |
4879 | /* |
4880 | * What we do here is to mark the in-core inode as clean with respect to inode | |
4881 | * dirtiness (it may still be data-dirty). | |
4882 | * This means that the in-core inode may be reaped by prune_icache | |
4883 | * without having to perform any I/O. This is a very good thing, | |
4884 | * because *any* task may call prune_icache - even ones which | |
4885 | * have a transaction open against a different journal. | |
4886 | * | |
4887 | * Is this cheating? Not really. Sure, we haven't written the | |
4888 | * inode out, but prune_icache isn't a user-visible syncing function. | |
4889 | * Whenever the user wants stuff synced (sys_sync, sys_msync, sys_fsync) | |
4890 | * we start and wait on commits. | |
ac27a0ec | 4891 | */ |
617ba13b | 4892 | int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode) |
ac27a0ec | 4893 | { |
617ba13b | 4894 | struct ext4_iloc iloc; |
6dd4ee7c KS |
4895 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
4896 | static unsigned int mnt_count; | |
4897 | int err, ret; | |
ac27a0ec DK |
4898 | |
4899 | might_sleep(); | |
7ff9c073 | 4900 | trace_ext4_mark_inode_dirty(inode, _RET_IP_); |
617ba13b | 4901 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
0390131b FM |
4902 | if (ext4_handle_valid(handle) && |
4903 | EXT4_I(inode)->i_extra_isize < sbi->s_want_extra_isize && | |
19f5fb7a | 4904 | !ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND)) { |
6dd4ee7c KS |
4905 | /* |
4906 | * We need extra buffer credits since we may write into EA block | |
4907 | * with this same handle. If journal_extend fails, then it will | |
4908 | * only result in a minor loss of functionality for that inode. | |
4909 | * If this is felt to be critical, then e2fsck should be run to | |
4910 | * force a large enough s_min_extra_isize. | |
4911 | */ | |
4912 | if ((jbd2_journal_extend(handle, | |
4913 | EXT4_DATA_TRANS_BLOCKS(inode->i_sb))) == 0) { | |
4914 | ret = ext4_expand_extra_isize(inode, | |
4915 | sbi->s_want_extra_isize, | |
4916 | iloc, handle); | |
4917 | if (ret) { | |
19f5fb7a TT |
4918 | ext4_set_inode_state(inode, |
4919 | EXT4_STATE_NO_EXPAND); | |
c1bddad9 AK |
4920 | if (mnt_count != |
4921 | le16_to_cpu(sbi->s_es->s_mnt_count)) { | |
12062ddd | 4922 | ext4_warning(inode->i_sb, |
6dd4ee7c KS |
4923 | "Unable to expand inode %lu. Delete" |
4924 | " some EAs or run e2fsck.", | |
4925 | inode->i_ino); | |
c1bddad9 AK |
4926 | mnt_count = |
4927 | le16_to_cpu(sbi->s_es->s_mnt_count); | |
6dd4ee7c KS |
4928 | } |
4929 | } | |
4930 | } | |
4931 | } | |
ac27a0ec | 4932 | if (!err) |
617ba13b | 4933 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec DK |
4934 | return err; |
4935 | } | |
4936 | ||
4937 | /* | |
617ba13b | 4938 | * ext4_dirty_inode() is called from __mark_inode_dirty() |
ac27a0ec DK |
4939 | * |
4940 | * We're really interested in the case where a file is being extended. | |
4941 | * i_size has been changed by generic_commit_write() and we thus need | |
4942 | * to include the updated inode in the current transaction. | |
4943 | * | |
5dd4056d | 4944 | * Also, dquot_alloc_block() will always dirty the inode when blocks |
ac27a0ec DK |
4945 | * are allocated to the file. |
4946 | * | |
4947 | * If the inode is marked synchronous, we don't honour that here - doing | |
4948 | * so would cause a commit on atime updates, which we don't bother doing. | |
4949 | * We handle synchronous inodes at the highest possible level. | |
4950 | */ | |
aa385729 | 4951 | void ext4_dirty_inode(struct inode *inode, int flags) |
ac27a0ec | 4952 | { |
ac27a0ec DK |
4953 | handle_t *handle; |
4954 | ||
9924a92a | 4955 | handle = ext4_journal_start(inode, EXT4_HT_INODE, 2); |
ac27a0ec DK |
4956 | if (IS_ERR(handle)) |
4957 | goto out; | |
f3dc272f | 4958 | |
f3dc272f CW |
4959 | ext4_mark_inode_dirty(handle, inode); |
4960 | ||
617ba13b | 4961 | ext4_journal_stop(handle); |
ac27a0ec DK |
4962 | out: |
4963 | return; | |
4964 | } | |
4965 | ||
4966 | #if 0 | |
4967 | /* | |
4968 | * Bind an inode's backing buffer_head into this transaction, to prevent | |
4969 | * it from being flushed to disk early. Unlike | |
617ba13b | 4970 | * ext4_reserve_inode_write, this leaves behind no bh reference and |
ac27a0ec DK |
4971 | * returns no iloc structure, so the caller needs to repeat the iloc |
4972 | * lookup to mark the inode dirty later. | |
4973 | */ | |
617ba13b | 4974 | static int ext4_pin_inode(handle_t *handle, struct inode *inode) |
ac27a0ec | 4975 | { |
617ba13b | 4976 | struct ext4_iloc iloc; |
ac27a0ec DK |
4977 | |
4978 | int err = 0; | |
4979 | if (handle) { | |
617ba13b | 4980 | err = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
4981 | if (!err) { |
4982 | BUFFER_TRACE(iloc.bh, "get_write_access"); | |
dab291af | 4983 | err = jbd2_journal_get_write_access(handle, iloc.bh); |
ac27a0ec | 4984 | if (!err) |
0390131b | 4985 | err = ext4_handle_dirty_metadata(handle, |
73b50c1c | 4986 | NULL, |
0390131b | 4987 | iloc.bh); |
ac27a0ec DK |
4988 | brelse(iloc.bh); |
4989 | } | |
4990 | } | |
617ba13b | 4991 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
4992 | return err; |
4993 | } | |
4994 | #endif | |
4995 | ||
617ba13b | 4996 | int ext4_change_inode_journal_flag(struct inode *inode, int val) |
ac27a0ec DK |
4997 | { |
4998 | journal_t *journal; | |
4999 | handle_t *handle; | |
5000 | int err; | |
5001 | ||
5002 | /* | |
5003 | * We have to be very careful here: changing a data block's | |
5004 | * journaling status dynamically is dangerous. If we write a | |
5005 | * data block to the journal, change the status and then delete | |
5006 | * that block, we risk forgetting to revoke the old log record | |
5007 | * from the journal and so a subsequent replay can corrupt data. | |
5008 | * So, first we make sure that the journal is empty and that | |
5009 | * nobody is changing anything. | |
5010 | */ | |
5011 | ||
617ba13b | 5012 | journal = EXT4_JOURNAL(inode); |
0390131b FM |
5013 | if (!journal) |
5014 | return 0; | |
d699594d | 5015 | if (is_journal_aborted(journal)) |
ac27a0ec | 5016 | return -EROFS; |
2aff57b0 YY |
5017 | /* We have to allocate physical blocks for delalloc blocks |
5018 | * before flushing journal. otherwise delalloc blocks can not | |
5019 | * be allocated any more. even more truncate on delalloc blocks | |
5020 | * could trigger BUG by flushing delalloc blocks in journal. | |
5021 | * There is no delalloc block in non-journal data mode. | |
5022 | */ | |
5023 | if (val && test_opt(inode->i_sb, DELALLOC)) { | |
5024 | err = ext4_alloc_da_blocks(inode); | |
5025 | if (err < 0) | |
5026 | return err; | |
5027 | } | |
ac27a0ec | 5028 | |
17335dcc DM |
5029 | /* Wait for all existing dio workers */ |
5030 | ext4_inode_block_unlocked_dio(inode); | |
5031 | inode_dio_wait(inode); | |
5032 | ||
dab291af | 5033 | jbd2_journal_lock_updates(journal); |
ac27a0ec DK |
5034 | |
5035 | /* | |
5036 | * OK, there are no updates running now, and all cached data is | |
5037 | * synced to disk. We are now in a completely consistent state | |
5038 | * which doesn't have anything in the journal, and we know that | |
5039 | * no filesystem updates are running, so it is safe to modify | |
5040 | * the inode's in-core data-journaling state flag now. | |
5041 | */ | |
5042 | ||
5043 | if (val) | |
12e9b892 | 5044 | ext4_set_inode_flag(inode, EXT4_INODE_JOURNAL_DATA); |
5872ddaa YY |
5045 | else { |
5046 | jbd2_journal_flush(journal); | |
12e9b892 | 5047 | ext4_clear_inode_flag(inode, EXT4_INODE_JOURNAL_DATA); |
5872ddaa | 5048 | } |
617ba13b | 5049 | ext4_set_aops(inode); |
ac27a0ec | 5050 | |
dab291af | 5051 | jbd2_journal_unlock_updates(journal); |
17335dcc | 5052 | ext4_inode_resume_unlocked_dio(inode); |
ac27a0ec DK |
5053 | |
5054 | /* Finally we can mark the inode as dirty. */ | |
5055 | ||
9924a92a | 5056 | handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); |
ac27a0ec DK |
5057 | if (IS_ERR(handle)) |
5058 | return PTR_ERR(handle); | |
5059 | ||
617ba13b | 5060 | err = ext4_mark_inode_dirty(handle, inode); |
0390131b | 5061 | ext4_handle_sync(handle); |
617ba13b MC |
5062 | ext4_journal_stop(handle); |
5063 | ext4_std_error(inode->i_sb, err); | |
ac27a0ec DK |
5064 | |
5065 | return err; | |
5066 | } | |
2e9ee850 AK |
5067 | |
5068 | static int ext4_bh_unmapped(handle_t *handle, struct buffer_head *bh) | |
5069 | { | |
5070 | return !buffer_mapped(bh); | |
5071 | } | |
5072 | ||
c2ec175c | 5073 | int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
2e9ee850 | 5074 | { |
c2ec175c | 5075 | struct page *page = vmf->page; |
2e9ee850 AK |
5076 | loff_t size; |
5077 | unsigned long len; | |
9ea7df53 | 5078 | int ret; |
2e9ee850 | 5079 | struct file *file = vma->vm_file; |
496ad9aa | 5080 | struct inode *inode = file_inode(file); |
2e9ee850 | 5081 | struct address_space *mapping = inode->i_mapping; |
9ea7df53 JK |
5082 | handle_t *handle; |
5083 | get_block_t *get_block; | |
5084 | int retries = 0; | |
2e9ee850 | 5085 | |
8e8ad8a5 | 5086 | sb_start_pagefault(inode->i_sb); |
041bbb6d | 5087 | file_update_time(vma->vm_file); |
9ea7df53 JK |
5088 | /* Delalloc case is easy... */ |
5089 | if (test_opt(inode->i_sb, DELALLOC) && | |
5090 | !ext4_should_journal_data(inode) && | |
5091 | !ext4_nonda_switch(inode->i_sb)) { | |
5092 | do { | |
5093 | ret = __block_page_mkwrite(vma, vmf, | |
5094 | ext4_da_get_block_prep); | |
5095 | } while (ret == -ENOSPC && | |
5096 | ext4_should_retry_alloc(inode->i_sb, &retries)); | |
5097 | goto out_ret; | |
2e9ee850 | 5098 | } |
0e499890 DW |
5099 | |
5100 | lock_page(page); | |
9ea7df53 JK |
5101 | size = i_size_read(inode); |
5102 | /* Page got truncated from under us? */ | |
5103 | if (page->mapping != mapping || page_offset(page) > size) { | |
5104 | unlock_page(page); | |
5105 | ret = VM_FAULT_NOPAGE; | |
5106 | goto out; | |
0e499890 | 5107 | } |
2e9ee850 AK |
5108 | |
5109 | if (page->index == size >> PAGE_CACHE_SHIFT) | |
5110 | len = size & ~PAGE_CACHE_MASK; | |
5111 | else | |
5112 | len = PAGE_CACHE_SIZE; | |
a827eaff | 5113 | /* |
9ea7df53 JK |
5114 | * Return if we have all the buffers mapped. This avoids the need to do |
5115 | * journal_start/journal_stop which can block and take a long time | |
a827eaff | 5116 | */ |
2e9ee850 | 5117 | if (page_has_buffers(page)) { |
f19d5870 TM |
5118 | if (!ext4_walk_page_buffers(NULL, page_buffers(page), |
5119 | 0, len, NULL, | |
5120 | ext4_bh_unmapped)) { | |
9ea7df53 | 5121 | /* Wait so that we don't change page under IO */ |
1d1d1a76 | 5122 | wait_for_stable_page(page); |
9ea7df53 JK |
5123 | ret = VM_FAULT_LOCKED; |
5124 | goto out; | |
a827eaff | 5125 | } |
2e9ee850 | 5126 | } |
a827eaff | 5127 | unlock_page(page); |
9ea7df53 JK |
5128 | /* OK, we need to fill the hole... */ |
5129 | if (ext4_should_dioread_nolock(inode)) | |
5130 | get_block = ext4_get_block_write; | |
5131 | else | |
5132 | get_block = ext4_get_block; | |
5133 | retry_alloc: | |
9924a92a TT |
5134 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, |
5135 | ext4_writepage_trans_blocks(inode)); | |
9ea7df53 | 5136 | if (IS_ERR(handle)) { |
c2ec175c | 5137 | ret = VM_FAULT_SIGBUS; |
9ea7df53 JK |
5138 | goto out; |
5139 | } | |
5140 | ret = __block_page_mkwrite(vma, vmf, get_block); | |
5141 | if (!ret && ext4_should_journal_data(inode)) { | |
f19d5870 | 5142 | if (ext4_walk_page_buffers(handle, page_buffers(page), 0, |
9ea7df53 JK |
5143 | PAGE_CACHE_SIZE, NULL, do_journal_get_write_access)) { |
5144 | unlock_page(page); | |
5145 | ret = VM_FAULT_SIGBUS; | |
fcbb5515 | 5146 | ext4_journal_stop(handle); |
9ea7df53 JK |
5147 | goto out; |
5148 | } | |
5149 | ext4_set_inode_state(inode, EXT4_STATE_JDATA); | |
5150 | } | |
5151 | ext4_journal_stop(handle); | |
5152 | if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) | |
5153 | goto retry_alloc; | |
5154 | out_ret: | |
5155 | ret = block_page_mkwrite_return(ret); | |
5156 | out: | |
8e8ad8a5 | 5157 | sb_end_pagefault(inode->i_sb); |
2e9ee850 AK |
5158 | return ret; |
5159 | } |