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> |
9bffad1e | 40 | |
3dcf5451 | 41 | #include "ext4_jbd2.h" |
ac27a0ec DK |
42 | #include "xattr.h" |
43 | #include "acl.h" | |
9f125d64 | 44 | #include "truncate.h" |
ac27a0ec | 45 | |
9bffad1e TT |
46 | #include <trace/events/ext4.h> |
47 | ||
a1d6cc56 AK |
48 | #define MPAGE_DA_EXTENT_TAIL 0x01 |
49 | ||
814525f4 DW |
50 | static __u32 ext4_inode_csum(struct inode *inode, struct ext4_inode *raw, |
51 | struct ext4_inode_info *ei) | |
52 | { | |
53 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
54 | __u16 csum_lo; | |
55 | __u16 csum_hi = 0; | |
56 | __u32 csum; | |
57 | ||
58 | csum_lo = raw->i_checksum_lo; | |
59 | raw->i_checksum_lo = 0; | |
60 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE && | |
61 | EXT4_FITS_IN_INODE(raw, ei, i_checksum_hi)) { | |
62 | csum_hi = raw->i_checksum_hi; | |
63 | raw->i_checksum_hi = 0; | |
64 | } | |
65 | ||
66 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)raw, | |
67 | EXT4_INODE_SIZE(inode->i_sb)); | |
68 | ||
69 | raw->i_checksum_lo = csum_lo; | |
70 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE && | |
71 | EXT4_FITS_IN_INODE(raw, ei, i_checksum_hi)) | |
72 | raw->i_checksum_hi = csum_hi; | |
73 | ||
74 | return csum; | |
75 | } | |
76 | ||
77 | static int ext4_inode_csum_verify(struct inode *inode, struct ext4_inode *raw, | |
78 | struct ext4_inode_info *ei) | |
79 | { | |
80 | __u32 provided, calculated; | |
81 | ||
82 | if (EXT4_SB(inode->i_sb)->s_es->s_creator_os != | |
83 | cpu_to_le32(EXT4_OS_LINUX) || | |
84 | !EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, | |
85 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) | |
86 | return 1; | |
87 | ||
88 | provided = le16_to_cpu(raw->i_checksum_lo); | |
89 | calculated = ext4_inode_csum(inode, raw, ei); | |
90 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE && | |
91 | EXT4_FITS_IN_INODE(raw, ei, i_checksum_hi)) | |
92 | provided |= ((__u32)le16_to_cpu(raw->i_checksum_hi)) << 16; | |
93 | else | |
94 | calculated &= 0xFFFF; | |
95 | ||
96 | return provided == calculated; | |
97 | } | |
98 | ||
99 | static void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, | |
100 | struct ext4_inode_info *ei) | |
101 | { | |
102 | __u32 csum; | |
103 | ||
104 | if (EXT4_SB(inode->i_sb)->s_es->s_creator_os != | |
105 | cpu_to_le32(EXT4_OS_LINUX) || | |
106 | !EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, | |
107 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) | |
108 | return; | |
109 | ||
110 | csum = ext4_inode_csum(inode, raw, ei); | |
111 | raw->i_checksum_lo = cpu_to_le16(csum & 0xFFFF); | |
112 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE && | |
113 | EXT4_FITS_IN_INODE(raw, ei, i_checksum_hi)) | |
114 | raw->i_checksum_hi = cpu_to_le16(csum >> 16); | |
115 | } | |
116 | ||
678aaf48 JK |
117 | static inline int ext4_begin_ordered_truncate(struct inode *inode, |
118 | loff_t new_size) | |
119 | { | |
7ff9c073 | 120 | trace_ext4_begin_ordered_truncate(inode, new_size); |
8aefcd55 TT |
121 | /* |
122 | * If jinode is zero, then we never opened the file for | |
123 | * writing, so there's no need to call | |
124 | * jbd2_journal_begin_ordered_truncate() since there's no | |
125 | * outstanding writes we need to flush. | |
126 | */ | |
127 | if (!EXT4_I(inode)->jinode) | |
128 | return 0; | |
129 | return jbd2_journal_begin_ordered_truncate(EXT4_JOURNAL(inode), | |
130 | EXT4_I(inode)->jinode, | |
131 | new_size); | |
678aaf48 JK |
132 | } |
133 | ||
64769240 | 134 | static void ext4_invalidatepage(struct page *page, unsigned long offset); |
cb20d518 TT |
135 | static int __ext4_journalled_writepage(struct page *page, unsigned int len); |
136 | static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh); | |
5f163cc7 ES |
137 | static int ext4_discard_partial_page_buffers_no_lock(handle_t *handle, |
138 | struct inode *inode, struct page *page, loff_t from, | |
139 | loff_t length, int flags); | |
64769240 | 140 | |
ac27a0ec DK |
141 | /* |
142 | * Test whether an inode is a fast symlink. | |
143 | */ | |
617ba13b | 144 | static int ext4_inode_is_fast_symlink(struct inode *inode) |
ac27a0ec | 145 | { |
617ba13b | 146 | int ea_blocks = EXT4_I(inode)->i_file_acl ? |
ac27a0ec DK |
147 | (inode->i_sb->s_blocksize >> 9) : 0; |
148 | ||
149 | return (S_ISLNK(inode->i_mode) && inode->i_blocks - ea_blocks == 0); | |
150 | } | |
151 | ||
ac27a0ec DK |
152 | /* |
153 | * Restart the transaction associated with *handle. This does a commit, | |
154 | * so before we call here everything must be consistently dirtied against | |
155 | * this transaction. | |
156 | */ | |
fa5d1113 | 157 | int ext4_truncate_restart_trans(handle_t *handle, struct inode *inode, |
487caeef | 158 | int nblocks) |
ac27a0ec | 159 | { |
487caeef JK |
160 | int ret; |
161 | ||
162 | /* | |
e35fd660 | 163 | * Drop i_data_sem to avoid deadlock with ext4_map_blocks. At this |
487caeef JK |
164 | * moment, get_block can be called only for blocks inside i_size since |
165 | * page cache has been already dropped and writes are blocked by | |
166 | * i_mutex. So we can safely drop the i_data_sem here. | |
167 | */ | |
0390131b | 168 | BUG_ON(EXT4_JOURNAL(inode) == NULL); |
ac27a0ec | 169 | jbd_debug(2, "restarting handle %p\n", handle); |
487caeef | 170 | up_write(&EXT4_I(inode)->i_data_sem); |
8e8eaabe | 171 | ret = ext4_journal_restart(handle, nblocks); |
487caeef | 172 | down_write(&EXT4_I(inode)->i_data_sem); |
fa5d1113 | 173 | ext4_discard_preallocations(inode); |
487caeef JK |
174 | |
175 | return ret; | |
ac27a0ec DK |
176 | } |
177 | ||
178 | /* | |
179 | * Called at the last iput() if i_nlink is zero. | |
180 | */ | |
0930fcc1 | 181 | void ext4_evict_inode(struct inode *inode) |
ac27a0ec DK |
182 | { |
183 | handle_t *handle; | |
bc965ab3 | 184 | int err; |
ac27a0ec | 185 | |
7ff9c073 | 186 | trace_ext4_evict_inode(inode); |
2581fdc8 | 187 | |
2581fdc8 JZ |
188 | ext4_ioend_wait(inode); |
189 | ||
0930fcc1 | 190 | if (inode->i_nlink) { |
2d859db3 JK |
191 | /* |
192 | * When journalling data dirty buffers are tracked only in the | |
193 | * journal. So although mm thinks everything is clean and | |
194 | * ready for reaping the inode might still have some pages to | |
195 | * write in the running transaction or waiting to be | |
196 | * checkpointed. Thus calling jbd2_journal_invalidatepage() | |
197 | * (via truncate_inode_pages()) to discard these buffers can | |
198 | * cause data loss. Also even if we did not discard these | |
199 | * buffers, we would have no way to find them after the inode | |
200 | * is reaped and thus user could see stale data if he tries to | |
201 | * read them before the transaction is checkpointed. So be | |
202 | * careful and force everything to disk here... We use | |
203 | * ei->i_datasync_tid to store the newest transaction | |
204 | * containing inode's data. | |
205 | * | |
206 | * Note that directories do not have this problem because they | |
207 | * don't use page cache. | |
208 | */ | |
209 | if (ext4_should_journal_data(inode) && | |
210 | (S_ISLNK(inode->i_mode) || S_ISREG(inode->i_mode))) { | |
211 | journal_t *journal = EXT4_SB(inode->i_sb)->s_journal; | |
212 | tid_t commit_tid = EXT4_I(inode)->i_datasync_tid; | |
213 | ||
214 | jbd2_log_start_commit(journal, commit_tid); | |
215 | jbd2_log_wait_commit(journal, commit_tid); | |
216 | filemap_write_and_wait(&inode->i_data); | |
217 | } | |
0930fcc1 AV |
218 | truncate_inode_pages(&inode->i_data, 0); |
219 | goto no_delete; | |
220 | } | |
221 | ||
907f4554 | 222 | if (!is_bad_inode(inode)) |
871a2931 | 223 | dquot_initialize(inode); |
907f4554 | 224 | |
678aaf48 JK |
225 | if (ext4_should_order_data(inode)) |
226 | ext4_begin_ordered_truncate(inode, 0); | |
ac27a0ec DK |
227 | truncate_inode_pages(&inode->i_data, 0); |
228 | ||
229 | if (is_bad_inode(inode)) | |
230 | goto no_delete; | |
231 | ||
8e8ad8a5 JK |
232 | /* |
233 | * Protect us against freezing - iput() caller didn't have to have any | |
234 | * protection against it | |
235 | */ | |
236 | sb_start_intwrite(inode->i_sb); | |
9924a92a TT |
237 | handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, |
238 | ext4_blocks_for_truncate(inode)+3); | |
ac27a0ec | 239 | if (IS_ERR(handle)) { |
bc965ab3 | 240 | ext4_std_error(inode->i_sb, PTR_ERR(handle)); |
ac27a0ec DK |
241 | /* |
242 | * If we're going to skip the normal cleanup, we still need to | |
243 | * make sure that the in-core orphan linked list is properly | |
244 | * cleaned up. | |
245 | */ | |
617ba13b | 246 | ext4_orphan_del(NULL, inode); |
8e8ad8a5 | 247 | sb_end_intwrite(inode->i_sb); |
ac27a0ec DK |
248 | goto no_delete; |
249 | } | |
250 | ||
251 | if (IS_SYNC(inode)) | |
0390131b | 252 | ext4_handle_sync(handle); |
ac27a0ec | 253 | inode->i_size = 0; |
bc965ab3 TT |
254 | err = ext4_mark_inode_dirty(handle, inode); |
255 | if (err) { | |
12062ddd | 256 | ext4_warning(inode->i_sb, |
bc965ab3 TT |
257 | "couldn't mark inode dirty (err %d)", err); |
258 | goto stop_handle; | |
259 | } | |
ac27a0ec | 260 | if (inode->i_blocks) |
617ba13b | 261 | ext4_truncate(inode); |
bc965ab3 TT |
262 | |
263 | /* | |
264 | * ext4_ext_truncate() doesn't reserve any slop when it | |
265 | * restarts journal transactions; therefore there may not be | |
266 | * enough credits left in the handle to remove the inode from | |
267 | * the orphan list and set the dtime field. | |
268 | */ | |
0390131b | 269 | if (!ext4_handle_has_enough_credits(handle, 3)) { |
bc965ab3 TT |
270 | err = ext4_journal_extend(handle, 3); |
271 | if (err > 0) | |
272 | err = ext4_journal_restart(handle, 3); | |
273 | if (err != 0) { | |
12062ddd | 274 | ext4_warning(inode->i_sb, |
bc965ab3 TT |
275 | "couldn't extend journal (err %d)", err); |
276 | stop_handle: | |
277 | ext4_journal_stop(handle); | |
45388219 | 278 | ext4_orphan_del(NULL, inode); |
8e8ad8a5 | 279 | sb_end_intwrite(inode->i_sb); |
bc965ab3 TT |
280 | goto no_delete; |
281 | } | |
282 | } | |
283 | ||
ac27a0ec | 284 | /* |
617ba13b | 285 | * Kill off the orphan record which ext4_truncate created. |
ac27a0ec | 286 | * AKPM: I think this can be inside the above `if'. |
617ba13b | 287 | * Note that ext4_orphan_del() has to be able to cope with the |
ac27a0ec | 288 | * deletion of a non-existent orphan - this is because we don't |
617ba13b | 289 | * know if ext4_truncate() actually created an orphan record. |
ac27a0ec DK |
290 | * (Well, we could do this if we need to, but heck - it works) |
291 | */ | |
617ba13b MC |
292 | ext4_orphan_del(handle, inode); |
293 | EXT4_I(inode)->i_dtime = get_seconds(); | |
ac27a0ec DK |
294 | |
295 | /* | |
296 | * One subtle ordering requirement: if anything has gone wrong | |
297 | * (transaction abort, IO errors, whatever), then we can still | |
298 | * do these next steps (the fs will already have been marked as | |
299 | * having errors), but we can't free the inode if the mark_dirty | |
300 | * fails. | |
301 | */ | |
617ba13b | 302 | if (ext4_mark_inode_dirty(handle, inode)) |
ac27a0ec | 303 | /* If that failed, just do the required in-core inode clear. */ |
0930fcc1 | 304 | ext4_clear_inode(inode); |
ac27a0ec | 305 | else |
617ba13b MC |
306 | ext4_free_inode(handle, inode); |
307 | ext4_journal_stop(handle); | |
8e8ad8a5 | 308 | sb_end_intwrite(inode->i_sb); |
ac27a0ec DK |
309 | return; |
310 | no_delete: | |
0930fcc1 | 311 | ext4_clear_inode(inode); /* We must guarantee clearing of inode... */ |
ac27a0ec DK |
312 | } |
313 | ||
a9e7f447 DM |
314 | #ifdef CONFIG_QUOTA |
315 | qsize_t *ext4_get_reserved_space(struct inode *inode) | |
60e58e0f | 316 | { |
a9e7f447 | 317 | return &EXT4_I(inode)->i_reserved_quota; |
60e58e0f | 318 | } |
a9e7f447 | 319 | #endif |
9d0be502 | 320 | |
12219aea AK |
321 | /* |
322 | * Calculate the number of metadata blocks need to reserve | |
9d0be502 | 323 | * to allocate a block located at @lblock |
12219aea | 324 | */ |
01f49d0b | 325 | static int ext4_calc_metadata_amount(struct inode *inode, ext4_lblk_t lblock) |
12219aea | 326 | { |
12e9b892 | 327 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
9d0be502 | 328 | return ext4_ext_calc_metadata_amount(inode, lblock); |
12219aea | 329 | |
8bb2b247 | 330 | return ext4_ind_calc_metadata_amount(inode, lblock); |
12219aea AK |
331 | } |
332 | ||
0637c6f4 TT |
333 | /* |
334 | * Called with i_data_sem down, which is important since we can call | |
335 | * ext4_discard_preallocations() from here. | |
336 | */ | |
5f634d06 AK |
337 | void ext4_da_update_reserve_space(struct inode *inode, |
338 | int used, int quota_claim) | |
12219aea AK |
339 | { |
340 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
0637c6f4 | 341 | struct ext4_inode_info *ei = EXT4_I(inode); |
0637c6f4 TT |
342 | |
343 | spin_lock(&ei->i_block_reservation_lock); | |
d8990240 | 344 | trace_ext4_da_update_reserve_space(inode, used, quota_claim); |
0637c6f4 | 345 | if (unlikely(used > ei->i_reserved_data_blocks)) { |
8de5c325 | 346 | ext4_warning(inode->i_sb, "%s: ino %lu, used %d " |
1084f252 | 347 | "with only %d reserved data blocks", |
0637c6f4 TT |
348 | __func__, inode->i_ino, used, |
349 | ei->i_reserved_data_blocks); | |
350 | WARN_ON(1); | |
351 | used = ei->i_reserved_data_blocks; | |
352 | } | |
12219aea | 353 | |
97795d2a | 354 | if (unlikely(ei->i_allocated_meta_blocks > ei->i_reserved_meta_blocks)) { |
01a523eb TT |
355 | ext4_warning(inode->i_sb, "ino %lu, allocated %d " |
356 | "with only %d reserved metadata blocks " | |
357 | "(releasing %d blocks with reserved %d data blocks)", | |
358 | inode->i_ino, ei->i_allocated_meta_blocks, | |
359 | ei->i_reserved_meta_blocks, used, | |
360 | ei->i_reserved_data_blocks); | |
97795d2a BF |
361 | WARN_ON(1); |
362 | ei->i_allocated_meta_blocks = ei->i_reserved_meta_blocks; | |
363 | } | |
364 | ||
0637c6f4 TT |
365 | /* Update per-inode reservations */ |
366 | ei->i_reserved_data_blocks -= used; | |
0637c6f4 | 367 | ei->i_reserved_meta_blocks -= ei->i_allocated_meta_blocks; |
57042651 | 368 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, |
72b8ab9d | 369 | used + ei->i_allocated_meta_blocks); |
0637c6f4 | 370 | ei->i_allocated_meta_blocks = 0; |
6bc6e63f | 371 | |
0637c6f4 TT |
372 | if (ei->i_reserved_data_blocks == 0) { |
373 | /* | |
374 | * We can release all of the reserved metadata blocks | |
375 | * only when we have written all of the delayed | |
376 | * allocation blocks. | |
377 | */ | |
57042651 | 378 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, |
72b8ab9d | 379 | ei->i_reserved_meta_blocks); |
ee5f4d9c | 380 | ei->i_reserved_meta_blocks = 0; |
9d0be502 | 381 | ei->i_da_metadata_calc_len = 0; |
6bc6e63f | 382 | } |
12219aea | 383 | spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); |
60e58e0f | 384 | |
72b8ab9d ES |
385 | /* Update quota subsystem for data blocks */ |
386 | if (quota_claim) | |
7b415bf6 | 387 | dquot_claim_block(inode, EXT4_C2B(sbi, used)); |
72b8ab9d | 388 | else { |
5f634d06 AK |
389 | /* |
390 | * We did fallocate with an offset that is already delayed | |
391 | * allocated. So on delayed allocated writeback we should | |
72b8ab9d | 392 | * not re-claim the quota for fallocated blocks. |
5f634d06 | 393 | */ |
7b415bf6 | 394 | dquot_release_reservation_block(inode, EXT4_C2B(sbi, used)); |
5f634d06 | 395 | } |
d6014301 AK |
396 | |
397 | /* | |
398 | * If we have done all the pending block allocations and if | |
399 | * there aren't any writers on the inode, we can discard the | |
400 | * inode's preallocations. | |
401 | */ | |
0637c6f4 TT |
402 | if ((ei->i_reserved_data_blocks == 0) && |
403 | (atomic_read(&inode->i_writecount) == 0)) | |
d6014301 | 404 | ext4_discard_preallocations(inode); |
12219aea AK |
405 | } |
406 | ||
e29136f8 | 407 | static int __check_block_validity(struct inode *inode, const char *func, |
c398eda0 TT |
408 | unsigned int line, |
409 | struct ext4_map_blocks *map) | |
6fd058f7 | 410 | { |
24676da4 TT |
411 | if (!ext4_data_block_valid(EXT4_SB(inode->i_sb), map->m_pblk, |
412 | map->m_len)) { | |
c398eda0 TT |
413 | ext4_error_inode(inode, func, line, map->m_pblk, |
414 | "lblock %lu mapped to illegal pblock " | |
415 | "(length %d)", (unsigned long) map->m_lblk, | |
416 | map->m_len); | |
6fd058f7 TT |
417 | return -EIO; |
418 | } | |
419 | return 0; | |
420 | } | |
421 | ||
e29136f8 | 422 | #define check_block_validity(inode, map) \ |
c398eda0 | 423 | __check_block_validity((inode), __func__, __LINE__, (map)) |
e29136f8 | 424 | |
55138e0b | 425 | /* |
1f94533d TT |
426 | * Return the number of contiguous dirty pages in a given inode |
427 | * starting at page frame idx. | |
55138e0b TT |
428 | */ |
429 | static pgoff_t ext4_num_dirty_pages(struct inode *inode, pgoff_t idx, | |
430 | unsigned int max_pages) | |
431 | { | |
432 | struct address_space *mapping = inode->i_mapping; | |
433 | pgoff_t index; | |
434 | struct pagevec pvec; | |
435 | pgoff_t num = 0; | |
436 | int i, nr_pages, done = 0; | |
437 | ||
438 | if (max_pages == 0) | |
439 | return 0; | |
440 | pagevec_init(&pvec, 0); | |
441 | while (!done) { | |
442 | index = idx; | |
443 | nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
444 | PAGECACHE_TAG_DIRTY, | |
445 | (pgoff_t)PAGEVEC_SIZE); | |
446 | if (nr_pages == 0) | |
447 | break; | |
448 | for (i = 0; i < nr_pages; i++) { | |
449 | struct page *page = pvec.pages[i]; | |
450 | struct buffer_head *bh, *head; | |
451 | ||
452 | lock_page(page); | |
453 | if (unlikely(page->mapping != mapping) || | |
454 | !PageDirty(page) || | |
455 | PageWriteback(page) || | |
456 | page->index != idx) { | |
457 | done = 1; | |
458 | unlock_page(page); | |
459 | break; | |
460 | } | |
1f94533d TT |
461 | if (page_has_buffers(page)) { |
462 | bh = head = page_buffers(page); | |
463 | do { | |
464 | if (!buffer_delay(bh) && | |
465 | !buffer_unwritten(bh)) | |
466 | done = 1; | |
467 | bh = bh->b_this_page; | |
468 | } while (!done && (bh != head)); | |
469 | } | |
55138e0b TT |
470 | unlock_page(page); |
471 | if (done) | |
472 | break; | |
473 | idx++; | |
474 | num++; | |
659c6009 ES |
475 | if (num >= max_pages) { |
476 | done = 1; | |
55138e0b | 477 | break; |
659c6009 | 478 | } |
55138e0b TT |
479 | } |
480 | pagevec_release(&pvec); | |
481 | } | |
482 | return num; | |
483 | } | |
484 | ||
f5ab0d1f | 485 | /* |
e35fd660 | 486 | * The ext4_map_blocks() function tries to look up the requested blocks, |
2b2d6d01 | 487 | * and returns if the blocks are already mapped. |
f5ab0d1f | 488 | * |
f5ab0d1f MC |
489 | * Otherwise it takes the write lock of the i_data_sem and allocate blocks |
490 | * and store the allocated blocks in the result buffer head and mark it | |
491 | * mapped. | |
492 | * | |
e35fd660 TT |
493 | * If file type is extents based, it will call ext4_ext_map_blocks(), |
494 | * Otherwise, call with ext4_ind_map_blocks() to handle indirect mapping | |
f5ab0d1f MC |
495 | * based files |
496 | * | |
497 | * On success, it returns the number of blocks being mapped or allocate. | |
498 | * if create==0 and the blocks are pre-allocated and uninitialized block, | |
499 | * the result buffer head is unmapped. If the create ==1, it will make sure | |
500 | * the buffer head is mapped. | |
501 | * | |
502 | * It returns 0 if plain look up failed (blocks have not been allocated), in | |
df3ab170 | 503 | * that case, buffer head is unmapped |
f5ab0d1f MC |
504 | * |
505 | * It returns the error in case of allocation failure. | |
506 | */ | |
e35fd660 TT |
507 | int ext4_map_blocks(handle_t *handle, struct inode *inode, |
508 | struct ext4_map_blocks *map, int flags) | |
0e855ac8 | 509 | { |
d100eef2 | 510 | struct extent_status es; |
0e855ac8 | 511 | int retval; |
f5ab0d1f | 512 | |
e35fd660 TT |
513 | map->m_flags = 0; |
514 | ext_debug("ext4_map_blocks(): inode %lu, flag %d, max_blocks %u," | |
515 | "logical block %lu\n", inode->i_ino, flags, map->m_len, | |
516 | (unsigned long) map->m_lblk); | |
d100eef2 ZL |
517 | |
518 | /* Lookup extent status tree firstly */ | |
519 | if (ext4_es_lookup_extent(inode, map->m_lblk, &es)) { | |
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 | } | |
534 | goto found; | |
535 | } | |
536 | ||
4df3d265 | 537 | /* |
b920c755 TT |
538 | * Try to see if we can get the block without requesting a new |
539 | * file system block. | |
4df3d265 | 540 | */ |
729f52c6 ZL |
541 | if (!(flags & EXT4_GET_BLOCKS_NO_LOCK)) |
542 | down_read((&EXT4_I(inode)->i_data_sem)); | |
12e9b892 | 543 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { |
a4e5d88b DM |
544 | retval = ext4_ext_map_blocks(handle, inode, map, flags & |
545 | EXT4_GET_BLOCKS_KEEP_SIZE); | |
0e855ac8 | 546 | } else { |
a4e5d88b DM |
547 | retval = ext4_ind_map_blocks(handle, inode, map, flags & |
548 | EXT4_GET_BLOCKS_KEEP_SIZE); | |
0e855ac8 | 549 | } |
f7fec032 ZL |
550 | if (retval > 0) { |
551 | int ret; | |
552 | unsigned long long status; | |
553 | ||
554 | status = map->m_flags & EXT4_MAP_UNWRITTEN ? | |
555 | EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN; | |
556 | if (!(flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) && | |
557 | ext4_find_delalloc_range(inode, map->m_lblk, | |
558 | map->m_lblk + map->m_len - 1)) | |
559 | status |= EXTENT_STATUS_DELAYED; | |
560 | ret = ext4_es_insert_extent(inode, map->m_lblk, | |
561 | map->m_len, map->m_pblk, status); | |
562 | if (ret < 0) | |
563 | retval = ret; | |
564 | } | |
729f52c6 ZL |
565 | if (!(flags & EXT4_GET_BLOCKS_NO_LOCK)) |
566 | up_read((&EXT4_I(inode)->i_data_sem)); | |
f5ab0d1f | 567 | |
d100eef2 | 568 | found: |
e35fd660 | 569 | if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) { |
f7fec032 | 570 | int ret = check_block_validity(inode, map); |
6fd058f7 TT |
571 | if (ret != 0) |
572 | return ret; | |
573 | } | |
574 | ||
f5ab0d1f | 575 | /* If it is only a block(s) look up */ |
c2177057 | 576 | if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) |
f5ab0d1f MC |
577 | return retval; |
578 | ||
579 | /* | |
580 | * Returns if the blocks have already allocated | |
581 | * | |
582 | * Note that if blocks have been preallocated | |
df3ab170 | 583 | * ext4_ext_get_block() returns the create = 0 |
f5ab0d1f MC |
584 | * with buffer head unmapped. |
585 | */ | |
e35fd660 | 586 | if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) |
4df3d265 AK |
587 | return retval; |
588 | ||
2a8964d6 | 589 | /* |
a25a4e1a ZL |
590 | * Here we clear m_flags because after allocating an new extent, |
591 | * it will be set again. | |
2a8964d6 | 592 | */ |
a25a4e1a | 593 | map->m_flags &= ~EXT4_MAP_FLAGS; |
2a8964d6 | 594 | |
4df3d265 | 595 | /* |
f5ab0d1f MC |
596 | * New blocks allocate and/or writing to uninitialized extent |
597 | * will possibly result in updating i_data, so we take | |
598 | * the write lock of i_data_sem, and call get_blocks() | |
599 | * with create == 1 flag. | |
4df3d265 AK |
600 | */ |
601 | down_write((&EXT4_I(inode)->i_data_sem)); | |
d2a17637 MC |
602 | |
603 | /* | |
604 | * if the caller is from delayed allocation writeout path | |
605 | * we have already reserved fs blocks for allocation | |
606 | * let the underlying get_block() function know to | |
607 | * avoid double accounting | |
608 | */ | |
c2177057 | 609 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) |
f2321097 | 610 | ext4_set_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED); |
4df3d265 AK |
611 | /* |
612 | * We need to check for EXT4 here because migrate | |
613 | * could have changed the inode type in between | |
614 | */ | |
12e9b892 | 615 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { |
e35fd660 | 616 | retval = ext4_ext_map_blocks(handle, inode, map, flags); |
0e855ac8 | 617 | } else { |
e35fd660 | 618 | retval = ext4_ind_map_blocks(handle, inode, map, flags); |
267e4db9 | 619 | |
e35fd660 | 620 | if (retval > 0 && map->m_flags & EXT4_MAP_NEW) { |
267e4db9 AK |
621 | /* |
622 | * We allocated new blocks which will result in | |
623 | * i_data's format changing. Force the migrate | |
624 | * to fail by clearing migrate flags | |
625 | */ | |
19f5fb7a | 626 | ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE); |
267e4db9 | 627 | } |
d2a17637 | 628 | |
5f634d06 AK |
629 | /* |
630 | * Update reserved blocks/metadata blocks after successful | |
631 | * block allocation which had been deferred till now. We don't | |
632 | * support fallocate for non extent files. So we can update | |
633 | * reserve space here. | |
634 | */ | |
635 | if ((retval > 0) && | |
1296cc85 | 636 | (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)) |
5f634d06 AK |
637 | ext4_da_update_reserve_space(inode, retval, 1); |
638 | } | |
f7fec032 | 639 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) |
f2321097 | 640 | ext4_clear_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED); |
2ac3b6e0 | 641 | |
f7fec032 ZL |
642 | if (retval > 0) { |
643 | int ret; | |
644 | unsigned long long status; | |
645 | ||
646 | status = map->m_flags & EXT4_MAP_UNWRITTEN ? | |
647 | EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN; | |
648 | if (!(flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) && | |
649 | ext4_find_delalloc_range(inode, map->m_lblk, | |
650 | map->m_lblk + map->m_len - 1)) | |
651 | status |= EXTENT_STATUS_DELAYED; | |
652 | ret = ext4_es_insert_extent(inode, map->m_lblk, map->m_len, | |
653 | map->m_pblk, status); | |
654 | if (ret < 0) | |
655 | retval = ret; | |
5356f261 AK |
656 | } |
657 | ||
4df3d265 | 658 | up_write((&EXT4_I(inode)->i_data_sem)); |
e35fd660 | 659 | if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) { |
e29136f8 | 660 | int ret = check_block_validity(inode, map); |
6fd058f7 TT |
661 | if (ret != 0) |
662 | return ret; | |
663 | } | |
0e855ac8 AK |
664 | return retval; |
665 | } | |
666 | ||
f3bd1f3f MC |
667 | /* Maximum number of blocks we map for direct IO at once. */ |
668 | #define DIO_MAX_BLOCKS 4096 | |
669 | ||
2ed88685 TT |
670 | static int _ext4_get_block(struct inode *inode, sector_t iblock, |
671 | struct buffer_head *bh, int flags) | |
ac27a0ec | 672 | { |
3e4fdaf8 | 673 | handle_t *handle = ext4_journal_current_handle(); |
2ed88685 | 674 | struct ext4_map_blocks map; |
7fb5409d | 675 | int ret = 0, started = 0; |
f3bd1f3f | 676 | int dio_credits; |
ac27a0ec | 677 | |
46c7f254 TM |
678 | if (ext4_has_inline_data(inode)) |
679 | return -ERANGE; | |
680 | ||
2ed88685 TT |
681 | map.m_lblk = iblock; |
682 | map.m_len = bh->b_size >> inode->i_blkbits; | |
683 | ||
8b0f165f | 684 | if (flags && !(flags & EXT4_GET_BLOCKS_NO_LOCK) && !handle) { |
7fb5409d | 685 | /* Direct IO write... */ |
2ed88685 TT |
686 | if (map.m_len > DIO_MAX_BLOCKS) |
687 | map.m_len = DIO_MAX_BLOCKS; | |
688 | dio_credits = ext4_chunk_trans_blocks(inode, map.m_len); | |
9924a92a TT |
689 | handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS, |
690 | dio_credits); | |
7fb5409d | 691 | if (IS_ERR(handle)) { |
ac27a0ec | 692 | ret = PTR_ERR(handle); |
2ed88685 | 693 | return ret; |
ac27a0ec | 694 | } |
7fb5409d | 695 | started = 1; |
ac27a0ec DK |
696 | } |
697 | ||
2ed88685 | 698 | ret = ext4_map_blocks(handle, inode, &map, flags); |
7fb5409d | 699 | if (ret > 0) { |
2ed88685 TT |
700 | map_bh(bh, inode->i_sb, map.m_pblk); |
701 | bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags; | |
702 | bh->b_size = inode->i_sb->s_blocksize * map.m_len; | |
7fb5409d | 703 | ret = 0; |
ac27a0ec | 704 | } |
7fb5409d JK |
705 | if (started) |
706 | ext4_journal_stop(handle); | |
ac27a0ec DK |
707 | return ret; |
708 | } | |
709 | ||
2ed88685 TT |
710 | int ext4_get_block(struct inode *inode, sector_t iblock, |
711 | struct buffer_head *bh, int create) | |
712 | { | |
713 | return _ext4_get_block(inode, iblock, bh, | |
714 | create ? EXT4_GET_BLOCKS_CREATE : 0); | |
715 | } | |
716 | ||
ac27a0ec DK |
717 | /* |
718 | * `handle' can be NULL if create is zero | |
719 | */ | |
617ba13b | 720 | struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode, |
725d26d3 | 721 | ext4_lblk_t block, int create, int *errp) |
ac27a0ec | 722 | { |
2ed88685 TT |
723 | struct ext4_map_blocks map; |
724 | struct buffer_head *bh; | |
ac27a0ec DK |
725 | int fatal = 0, err; |
726 | ||
727 | J_ASSERT(handle != NULL || create == 0); | |
728 | ||
2ed88685 TT |
729 | map.m_lblk = block; |
730 | map.m_len = 1; | |
731 | err = ext4_map_blocks(handle, inode, &map, | |
732 | create ? EXT4_GET_BLOCKS_CREATE : 0); | |
ac27a0ec | 733 | |
90b0a973 CM |
734 | /* ensure we send some value back into *errp */ |
735 | *errp = 0; | |
736 | ||
0f70b406 TT |
737 | if (create && err == 0) |
738 | err = -ENOSPC; /* should never happen */ | |
2ed88685 TT |
739 | if (err < 0) |
740 | *errp = err; | |
741 | if (err <= 0) | |
742 | return NULL; | |
2ed88685 TT |
743 | |
744 | bh = sb_getblk(inode->i_sb, map.m_pblk); | |
aebf0243 | 745 | if (unlikely(!bh)) { |
860d21e2 | 746 | *errp = -ENOMEM; |
2ed88685 | 747 | return NULL; |
ac27a0ec | 748 | } |
2ed88685 TT |
749 | if (map.m_flags & EXT4_MAP_NEW) { |
750 | J_ASSERT(create != 0); | |
751 | J_ASSERT(handle != NULL); | |
ac27a0ec | 752 | |
2ed88685 TT |
753 | /* |
754 | * Now that we do not always journal data, we should | |
755 | * keep in mind whether this should always journal the | |
756 | * new buffer as metadata. For now, regular file | |
757 | * writes use ext4_get_block instead, so it's not a | |
758 | * problem. | |
759 | */ | |
760 | lock_buffer(bh); | |
761 | BUFFER_TRACE(bh, "call get_create_access"); | |
762 | fatal = ext4_journal_get_create_access(handle, bh); | |
763 | if (!fatal && !buffer_uptodate(bh)) { | |
764 | memset(bh->b_data, 0, inode->i_sb->s_blocksize); | |
765 | set_buffer_uptodate(bh); | |
ac27a0ec | 766 | } |
2ed88685 TT |
767 | unlock_buffer(bh); |
768 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); | |
769 | err = ext4_handle_dirty_metadata(handle, inode, bh); | |
770 | if (!fatal) | |
771 | fatal = err; | |
772 | } else { | |
773 | BUFFER_TRACE(bh, "not a new buffer"); | |
ac27a0ec | 774 | } |
2ed88685 TT |
775 | if (fatal) { |
776 | *errp = fatal; | |
777 | brelse(bh); | |
778 | bh = NULL; | |
779 | } | |
780 | return bh; | |
ac27a0ec DK |
781 | } |
782 | ||
617ba13b | 783 | struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode, |
725d26d3 | 784 | ext4_lblk_t block, int create, int *err) |
ac27a0ec | 785 | { |
af5bc92d | 786 | struct buffer_head *bh; |
ac27a0ec | 787 | |
617ba13b | 788 | bh = ext4_getblk(handle, inode, block, create, err); |
ac27a0ec DK |
789 | if (!bh) |
790 | return bh; | |
791 | if (buffer_uptodate(bh)) | |
792 | return bh; | |
65299a3b | 793 | ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &bh); |
ac27a0ec DK |
794 | wait_on_buffer(bh); |
795 | if (buffer_uptodate(bh)) | |
796 | return bh; | |
797 | put_bh(bh); | |
798 | *err = -EIO; | |
799 | return NULL; | |
800 | } | |
801 | ||
f19d5870 TM |
802 | int ext4_walk_page_buffers(handle_t *handle, |
803 | struct buffer_head *head, | |
804 | unsigned from, | |
805 | unsigned to, | |
806 | int *partial, | |
807 | int (*fn)(handle_t *handle, | |
808 | struct buffer_head *bh)) | |
ac27a0ec DK |
809 | { |
810 | struct buffer_head *bh; | |
811 | unsigned block_start, block_end; | |
812 | unsigned blocksize = head->b_size; | |
813 | int err, ret = 0; | |
814 | struct buffer_head *next; | |
815 | ||
af5bc92d TT |
816 | for (bh = head, block_start = 0; |
817 | ret == 0 && (bh != head || !block_start); | |
de9a55b8 | 818 | block_start = block_end, bh = next) { |
ac27a0ec DK |
819 | next = bh->b_this_page; |
820 | block_end = block_start + blocksize; | |
821 | if (block_end <= from || block_start >= to) { | |
822 | if (partial && !buffer_uptodate(bh)) | |
823 | *partial = 1; | |
824 | continue; | |
825 | } | |
826 | err = (*fn)(handle, bh); | |
827 | if (!ret) | |
828 | ret = err; | |
829 | } | |
830 | return ret; | |
831 | } | |
832 | ||
833 | /* | |
834 | * To preserve ordering, it is essential that the hole instantiation and | |
835 | * the data write be encapsulated in a single transaction. We cannot | |
617ba13b | 836 | * close off a transaction and start a new one between the ext4_get_block() |
dab291af | 837 | * and the commit_write(). So doing the jbd2_journal_start at the start of |
ac27a0ec DK |
838 | * prepare_write() is the right place. |
839 | * | |
36ade451 JK |
840 | * Also, this function can nest inside ext4_writepage(). In that case, we |
841 | * *know* that ext4_writepage() has generated enough buffer credits to do the | |
842 | * whole page. So we won't block on the journal in that case, which is good, | |
843 | * because the caller may be PF_MEMALLOC. | |
ac27a0ec | 844 | * |
617ba13b | 845 | * By accident, ext4 can be reentered when a transaction is open via |
ac27a0ec DK |
846 | * quota file writes. If we were to commit the transaction while thus |
847 | * reentered, there can be a deadlock - we would be holding a quota | |
848 | * lock, and the commit would never complete if another thread had a | |
849 | * transaction open and was blocking on the quota lock - a ranking | |
850 | * violation. | |
851 | * | |
dab291af | 852 | * So what we do is to rely on the fact that jbd2_journal_stop/journal_start |
ac27a0ec DK |
853 | * will _not_ run commit under these circumstances because handle->h_ref |
854 | * is elevated. We'll still have enough credits for the tiny quotafile | |
855 | * write. | |
856 | */ | |
f19d5870 TM |
857 | int do_journal_get_write_access(handle_t *handle, |
858 | struct buffer_head *bh) | |
ac27a0ec | 859 | { |
56d35a4c JK |
860 | int dirty = buffer_dirty(bh); |
861 | int ret; | |
862 | ||
ac27a0ec DK |
863 | if (!buffer_mapped(bh) || buffer_freed(bh)) |
864 | return 0; | |
56d35a4c | 865 | /* |
ebdec241 | 866 | * __block_write_begin() could have dirtied some buffers. Clean |
56d35a4c JK |
867 | * the dirty bit as jbd2_journal_get_write_access() could complain |
868 | * otherwise about fs integrity issues. Setting of the dirty bit | |
ebdec241 | 869 | * by __block_write_begin() isn't a real problem here as we clear |
56d35a4c JK |
870 | * the bit before releasing a page lock and thus writeback cannot |
871 | * ever write the buffer. | |
872 | */ | |
873 | if (dirty) | |
874 | clear_buffer_dirty(bh); | |
875 | ret = ext4_journal_get_write_access(handle, bh); | |
876 | if (!ret && dirty) | |
877 | ret = ext4_handle_dirty_metadata(handle, NULL, bh); | |
878 | return ret; | |
ac27a0ec DK |
879 | } |
880 | ||
8b0f165f AP |
881 | static int ext4_get_block_write_nolock(struct inode *inode, sector_t iblock, |
882 | struct buffer_head *bh_result, int create); | |
bfc1af65 | 883 | static int ext4_write_begin(struct file *file, struct address_space *mapping, |
de9a55b8 TT |
884 | loff_t pos, unsigned len, unsigned flags, |
885 | struct page **pagep, void **fsdata) | |
ac27a0ec | 886 | { |
af5bc92d | 887 | struct inode *inode = mapping->host; |
1938a150 | 888 | int ret, needed_blocks; |
ac27a0ec DK |
889 | handle_t *handle; |
890 | int retries = 0; | |
af5bc92d | 891 | struct page *page; |
de9a55b8 | 892 | pgoff_t index; |
af5bc92d | 893 | unsigned from, to; |
bfc1af65 | 894 | |
9bffad1e | 895 | trace_ext4_write_begin(inode, pos, len, flags); |
1938a150 AK |
896 | /* |
897 | * Reserve one block more for addition to orphan list in case | |
898 | * we allocate blocks but write fails for some reason | |
899 | */ | |
900 | needed_blocks = ext4_writepage_trans_blocks(inode) + 1; | |
de9a55b8 | 901 | index = pos >> PAGE_CACHE_SHIFT; |
af5bc92d TT |
902 | from = pos & (PAGE_CACHE_SIZE - 1); |
903 | to = from + len; | |
ac27a0ec | 904 | |
f19d5870 TM |
905 | if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) { |
906 | ret = ext4_try_to_write_inline_data(mapping, inode, pos, len, | |
907 | flags, pagep); | |
908 | if (ret < 0) | |
47564bfb TT |
909 | return ret; |
910 | if (ret == 1) | |
911 | return 0; | |
f19d5870 TM |
912 | } |
913 | ||
47564bfb TT |
914 | /* |
915 | * grab_cache_page_write_begin() can take a long time if the | |
916 | * system is thrashing due to memory pressure, or if the page | |
917 | * is being written back. So grab it first before we start | |
918 | * the transaction handle. This also allows us to allocate | |
919 | * the page (if needed) without using GFP_NOFS. | |
920 | */ | |
921 | retry_grab: | |
922 | page = grab_cache_page_write_begin(mapping, index, flags); | |
923 | if (!page) | |
924 | return -ENOMEM; | |
925 | unlock_page(page); | |
926 | ||
927 | retry_journal: | |
9924a92a | 928 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks); |
af5bc92d | 929 | if (IS_ERR(handle)) { |
47564bfb TT |
930 | page_cache_release(page); |
931 | return PTR_ERR(handle); | |
7479d2b9 | 932 | } |
ac27a0ec | 933 | |
47564bfb TT |
934 | lock_page(page); |
935 | if (page->mapping != mapping) { | |
936 | /* The page got truncated from under us */ | |
937 | unlock_page(page); | |
938 | page_cache_release(page); | |
cf108bca | 939 | ext4_journal_stop(handle); |
47564bfb | 940 | goto retry_grab; |
cf108bca | 941 | } |
47564bfb | 942 | wait_on_page_writeback(page); |
cf108bca | 943 | |
744692dc | 944 | if (ext4_should_dioread_nolock(inode)) |
6e1db88d | 945 | ret = __block_write_begin(page, pos, len, ext4_get_block_write); |
744692dc | 946 | else |
6e1db88d | 947 | ret = __block_write_begin(page, pos, len, ext4_get_block); |
bfc1af65 NP |
948 | |
949 | if (!ret && ext4_should_journal_data(inode)) { | |
f19d5870 TM |
950 | ret = ext4_walk_page_buffers(handle, page_buffers(page), |
951 | from, to, NULL, | |
952 | do_journal_get_write_access); | |
ac27a0ec | 953 | } |
bfc1af65 NP |
954 | |
955 | if (ret) { | |
af5bc92d | 956 | unlock_page(page); |
ae4d5372 | 957 | /* |
6e1db88d | 958 | * __block_write_begin may have instantiated a few blocks |
ae4d5372 AK |
959 | * outside i_size. Trim these off again. Don't need |
960 | * i_size_read because we hold i_mutex. | |
1938a150 AK |
961 | * |
962 | * Add inode to orphan list in case we crash before | |
963 | * truncate finishes | |
ae4d5372 | 964 | */ |
ffacfa7a | 965 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
1938a150 AK |
966 | ext4_orphan_add(handle, inode); |
967 | ||
968 | ext4_journal_stop(handle); | |
969 | if (pos + len > inode->i_size) { | |
b9a4207d | 970 | ext4_truncate_failed_write(inode); |
de9a55b8 | 971 | /* |
ffacfa7a | 972 | * If truncate failed early the inode might |
1938a150 AK |
973 | * still be on the orphan list; we need to |
974 | * make sure the inode is removed from the | |
975 | * orphan list in that case. | |
976 | */ | |
977 | if (inode->i_nlink) | |
978 | ext4_orphan_del(NULL, inode); | |
979 | } | |
bfc1af65 | 980 | |
47564bfb TT |
981 | if (ret == -ENOSPC && |
982 | ext4_should_retry_alloc(inode->i_sb, &retries)) | |
983 | goto retry_journal; | |
984 | page_cache_release(page); | |
985 | return ret; | |
986 | } | |
987 | *pagep = page; | |
ac27a0ec DK |
988 | return ret; |
989 | } | |
990 | ||
bfc1af65 NP |
991 | /* For write_end() in data=journal mode */ |
992 | static int write_end_fn(handle_t *handle, struct buffer_head *bh) | |
ac27a0ec DK |
993 | { |
994 | if (!buffer_mapped(bh) || buffer_freed(bh)) | |
995 | return 0; | |
996 | set_buffer_uptodate(bh); | |
0390131b | 997 | return ext4_handle_dirty_metadata(handle, NULL, bh); |
ac27a0ec DK |
998 | } |
999 | ||
f8514083 | 1000 | static int ext4_generic_write_end(struct file *file, |
de9a55b8 TT |
1001 | struct address_space *mapping, |
1002 | loff_t pos, unsigned len, unsigned copied, | |
1003 | struct page *page, void *fsdata) | |
f8514083 AK |
1004 | { |
1005 | int i_size_changed = 0; | |
1006 | struct inode *inode = mapping->host; | |
1007 | handle_t *handle = ext4_journal_current_handle(); | |
1008 | ||
f19d5870 TM |
1009 | if (ext4_has_inline_data(inode)) |
1010 | copied = ext4_write_inline_data_end(inode, pos, len, | |
1011 | copied, page); | |
1012 | else | |
1013 | copied = block_write_end(file, mapping, pos, | |
1014 | len, copied, page, fsdata); | |
f8514083 AK |
1015 | |
1016 | /* | |
1017 | * No need to use i_size_read() here, the i_size | |
1018 | * cannot change under us because we hold i_mutex. | |
1019 | * | |
1020 | * But it's important to update i_size while still holding page lock: | |
1021 | * page writeout could otherwise come in and zero beyond i_size. | |
1022 | */ | |
1023 | if (pos + copied > inode->i_size) { | |
1024 | i_size_write(inode, pos + copied); | |
1025 | i_size_changed = 1; | |
1026 | } | |
1027 | ||
1028 | if (pos + copied > EXT4_I(inode)->i_disksize) { | |
1029 | /* We need to mark inode dirty even if | |
1030 | * new_i_size is less that inode->i_size | |
1031 | * bu greater than i_disksize.(hint delalloc) | |
1032 | */ | |
1033 | ext4_update_i_disksize(inode, (pos + copied)); | |
1034 | i_size_changed = 1; | |
1035 | } | |
1036 | unlock_page(page); | |
1037 | page_cache_release(page); | |
1038 | ||
1039 | /* | |
1040 | * Don't mark the inode dirty under page lock. First, it unnecessarily | |
1041 | * makes the holding time of page lock longer. Second, it forces lock | |
1042 | * ordering of page lock and transaction start for journaling | |
1043 | * filesystems. | |
1044 | */ | |
1045 | if (i_size_changed) | |
1046 | ext4_mark_inode_dirty(handle, inode); | |
1047 | ||
1048 | return copied; | |
1049 | } | |
1050 | ||
ac27a0ec DK |
1051 | /* |
1052 | * We need to pick up the new inode size which generic_commit_write gave us | |
1053 | * `file' can be NULL - eg, when called from page_symlink(). | |
1054 | * | |
617ba13b | 1055 | * ext4 never places buffers on inode->i_mapping->private_list. metadata |
ac27a0ec DK |
1056 | * buffers are managed internally. |
1057 | */ | |
bfc1af65 | 1058 | static int ext4_ordered_write_end(struct file *file, |
de9a55b8 TT |
1059 | struct address_space *mapping, |
1060 | loff_t pos, unsigned len, unsigned copied, | |
1061 | struct page *page, void *fsdata) | |
ac27a0ec | 1062 | { |
617ba13b | 1063 | handle_t *handle = ext4_journal_current_handle(); |
cf108bca | 1064 | struct inode *inode = mapping->host; |
ac27a0ec DK |
1065 | int ret = 0, ret2; |
1066 | ||
9bffad1e | 1067 | trace_ext4_ordered_write_end(inode, pos, len, copied); |
678aaf48 | 1068 | ret = ext4_jbd2_file_inode(handle, inode); |
ac27a0ec DK |
1069 | |
1070 | if (ret == 0) { | |
f8514083 | 1071 | ret2 = ext4_generic_write_end(file, mapping, pos, len, copied, |
bfc1af65 | 1072 | page, fsdata); |
f8a87d89 | 1073 | copied = ret2; |
ffacfa7a | 1074 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
f8514083 AK |
1075 | /* if we have allocated more blocks and copied |
1076 | * less. We will have blocks allocated outside | |
1077 | * inode->i_size. So truncate them | |
1078 | */ | |
1079 | ext4_orphan_add(handle, inode); | |
f8a87d89 RK |
1080 | if (ret2 < 0) |
1081 | ret = ret2; | |
09e0834f AF |
1082 | } else { |
1083 | unlock_page(page); | |
1084 | page_cache_release(page); | |
ac27a0ec | 1085 | } |
09e0834f | 1086 | |
617ba13b | 1087 | ret2 = ext4_journal_stop(handle); |
ac27a0ec DK |
1088 | if (!ret) |
1089 | ret = ret2; | |
bfc1af65 | 1090 | |
f8514083 | 1091 | if (pos + len > inode->i_size) { |
b9a4207d | 1092 | ext4_truncate_failed_write(inode); |
de9a55b8 | 1093 | /* |
ffacfa7a | 1094 | * If truncate failed early the inode might still be |
f8514083 AK |
1095 | * on the orphan list; we need to make sure the inode |
1096 | * is removed from the orphan list in that case. | |
1097 | */ | |
1098 | if (inode->i_nlink) | |
1099 | ext4_orphan_del(NULL, inode); | |
1100 | } | |
1101 | ||
1102 | ||
bfc1af65 | 1103 | return ret ? ret : copied; |
ac27a0ec DK |
1104 | } |
1105 | ||
bfc1af65 | 1106 | static int ext4_writeback_write_end(struct file *file, |
de9a55b8 TT |
1107 | struct address_space *mapping, |
1108 | loff_t pos, unsigned len, unsigned copied, | |
1109 | struct page *page, void *fsdata) | |
ac27a0ec | 1110 | { |
617ba13b | 1111 | handle_t *handle = ext4_journal_current_handle(); |
cf108bca | 1112 | struct inode *inode = mapping->host; |
ac27a0ec | 1113 | int ret = 0, ret2; |
ac27a0ec | 1114 | |
9bffad1e | 1115 | trace_ext4_writeback_write_end(inode, pos, len, copied); |
f8514083 | 1116 | ret2 = ext4_generic_write_end(file, mapping, pos, len, copied, |
bfc1af65 | 1117 | page, fsdata); |
f8a87d89 | 1118 | copied = ret2; |
ffacfa7a | 1119 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
f8514083 AK |
1120 | /* if we have allocated more blocks and copied |
1121 | * less. We will have blocks allocated outside | |
1122 | * inode->i_size. So truncate them | |
1123 | */ | |
1124 | ext4_orphan_add(handle, inode); | |
1125 | ||
f8a87d89 RK |
1126 | if (ret2 < 0) |
1127 | ret = ret2; | |
ac27a0ec | 1128 | |
617ba13b | 1129 | ret2 = ext4_journal_stop(handle); |
ac27a0ec DK |
1130 | if (!ret) |
1131 | ret = ret2; | |
bfc1af65 | 1132 | |
f8514083 | 1133 | if (pos + len > inode->i_size) { |
b9a4207d | 1134 | ext4_truncate_failed_write(inode); |
de9a55b8 | 1135 | /* |
ffacfa7a | 1136 | * If truncate failed early the inode might still be |
f8514083 AK |
1137 | * on the orphan list; we need to make sure the inode |
1138 | * is removed from the orphan list in that case. | |
1139 | */ | |
1140 | if (inode->i_nlink) | |
1141 | ext4_orphan_del(NULL, inode); | |
1142 | } | |
1143 | ||
bfc1af65 | 1144 | return ret ? ret : copied; |
ac27a0ec DK |
1145 | } |
1146 | ||
bfc1af65 | 1147 | static int ext4_journalled_write_end(struct file *file, |
de9a55b8 TT |
1148 | struct address_space *mapping, |
1149 | loff_t pos, unsigned len, unsigned copied, | |
1150 | struct page *page, void *fsdata) | |
ac27a0ec | 1151 | { |
617ba13b | 1152 | handle_t *handle = ext4_journal_current_handle(); |
bfc1af65 | 1153 | struct inode *inode = mapping->host; |
ac27a0ec DK |
1154 | int ret = 0, ret2; |
1155 | int partial = 0; | |
bfc1af65 | 1156 | unsigned from, to; |
cf17fea6 | 1157 | loff_t new_i_size; |
ac27a0ec | 1158 | |
9bffad1e | 1159 | trace_ext4_journalled_write_end(inode, pos, len, copied); |
bfc1af65 NP |
1160 | from = pos & (PAGE_CACHE_SIZE - 1); |
1161 | to = from + len; | |
1162 | ||
441c8508 CW |
1163 | BUG_ON(!ext4_handle_valid(handle)); |
1164 | ||
3fdcfb66 TM |
1165 | if (ext4_has_inline_data(inode)) |
1166 | copied = ext4_write_inline_data_end(inode, pos, len, | |
1167 | copied, page); | |
1168 | else { | |
1169 | if (copied < len) { | |
1170 | if (!PageUptodate(page)) | |
1171 | copied = 0; | |
1172 | page_zero_new_buffers(page, from+copied, to); | |
1173 | } | |
ac27a0ec | 1174 | |
3fdcfb66 TM |
1175 | ret = ext4_walk_page_buffers(handle, page_buffers(page), from, |
1176 | to, &partial, write_end_fn); | |
1177 | if (!partial) | |
1178 | SetPageUptodate(page); | |
1179 | } | |
cf17fea6 AK |
1180 | new_i_size = pos + copied; |
1181 | if (new_i_size > inode->i_size) | |
bfc1af65 | 1182 | i_size_write(inode, pos+copied); |
19f5fb7a | 1183 | ext4_set_inode_state(inode, EXT4_STATE_JDATA); |
2d859db3 | 1184 | EXT4_I(inode)->i_datasync_tid = handle->h_transaction->t_tid; |
cf17fea6 AK |
1185 | if (new_i_size > EXT4_I(inode)->i_disksize) { |
1186 | ext4_update_i_disksize(inode, new_i_size); | |
617ba13b | 1187 | ret2 = ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
1188 | if (!ret) |
1189 | ret = ret2; | |
1190 | } | |
bfc1af65 | 1191 | |
cf108bca | 1192 | unlock_page(page); |
f8514083 | 1193 | page_cache_release(page); |
ffacfa7a | 1194 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
f8514083 AK |
1195 | /* if we have allocated more blocks and copied |
1196 | * less. We will have blocks allocated outside | |
1197 | * inode->i_size. So truncate them | |
1198 | */ | |
1199 | ext4_orphan_add(handle, inode); | |
1200 | ||
617ba13b | 1201 | ret2 = ext4_journal_stop(handle); |
ac27a0ec DK |
1202 | if (!ret) |
1203 | ret = ret2; | |
f8514083 | 1204 | if (pos + len > inode->i_size) { |
b9a4207d | 1205 | ext4_truncate_failed_write(inode); |
de9a55b8 | 1206 | /* |
ffacfa7a | 1207 | * If truncate failed early the inode might still be |
f8514083 AK |
1208 | * on the orphan list; we need to make sure the inode |
1209 | * is removed from the orphan list in that case. | |
1210 | */ | |
1211 | if (inode->i_nlink) | |
1212 | ext4_orphan_del(NULL, inode); | |
1213 | } | |
bfc1af65 NP |
1214 | |
1215 | return ret ? ret : copied; | |
ac27a0ec | 1216 | } |
d2a17637 | 1217 | |
9d0be502 | 1218 | /* |
7b415bf6 | 1219 | * Reserve a single cluster located at lblock |
9d0be502 | 1220 | */ |
01f49d0b | 1221 | static int ext4_da_reserve_space(struct inode *inode, ext4_lblk_t lblock) |
d2a17637 | 1222 | { |
030ba6bc | 1223 | int retries = 0; |
60e58e0f | 1224 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
0637c6f4 | 1225 | struct ext4_inode_info *ei = EXT4_I(inode); |
7b415bf6 | 1226 | unsigned int md_needed; |
5dd4056d | 1227 | int ret; |
03179fe9 TT |
1228 | ext4_lblk_t save_last_lblock; |
1229 | int save_len; | |
1230 | ||
1231 | /* | |
1232 | * We will charge metadata quota at writeout time; this saves | |
1233 | * us from metadata over-estimation, though we may go over by | |
1234 | * a small amount in the end. Here we just reserve for data. | |
1235 | */ | |
1236 | ret = dquot_reserve_block(inode, EXT4_C2B(sbi, 1)); | |
1237 | if (ret) | |
1238 | return ret; | |
d2a17637 MC |
1239 | |
1240 | /* | |
1241 | * recalculate the amount of metadata blocks to reserve | |
1242 | * in order to allocate nrblocks | |
1243 | * worse case is one extent per block | |
1244 | */ | |
030ba6bc | 1245 | repeat: |
0637c6f4 | 1246 | spin_lock(&ei->i_block_reservation_lock); |
03179fe9 TT |
1247 | /* |
1248 | * ext4_calc_metadata_amount() has side effects, which we have | |
1249 | * to be prepared undo if we fail to claim space. | |
1250 | */ | |
1251 | save_len = ei->i_da_metadata_calc_len; | |
1252 | save_last_lblock = ei->i_da_metadata_calc_last_lblock; | |
7b415bf6 AK |
1253 | md_needed = EXT4_NUM_B2C(sbi, |
1254 | ext4_calc_metadata_amount(inode, lblock)); | |
f8ec9d68 | 1255 | trace_ext4_da_reserve_space(inode, md_needed); |
d2a17637 | 1256 | |
72b8ab9d ES |
1257 | /* |
1258 | * We do still charge estimated metadata to the sb though; | |
1259 | * we cannot afford to run out of free blocks. | |
1260 | */ | |
e7d5f315 | 1261 | if (ext4_claim_free_clusters(sbi, md_needed + 1, 0)) { |
03179fe9 TT |
1262 | ei->i_da_metadata_calc_len = save_len; |
1263 | ei->i_da_metadata_calc_last_lblock = save_last_lblock; | |
1264 | spin_unlock(&ei->i_block_reservation_lock); | |
030ba6bc AK |
1265 | if (ext4_should_retry_alloc(inode->i_sb, &retries)) { |
1266 | yield(); | |
1267 | goto repeat; | |
1268 | } | |
03179fe9 | 1269 | dquot_release_reservation_block(inode, EXT4_C2B(sbi, 1)); |
d2a17637 MC |
1270 | return -ENOSPC; |
1271 | } | |
9d0be502 | 1272 | ei->i_reserved_data_blocks++; |
0637c6f4 TT |
1273 | ei->i_reserved_meta_blocks += md_needed; |
1274 | spin_unlock(&ei->i_block_reservation_lock); | |
39bc680a | 1275 | |
d2a17637 MC |
1276 | return 0; /* success */ |
1277 | } | |
1278 | ||
12219aea | 1279 | static void ext4_da_release_space(struct inode *inode, int to_free) |
d2a17637 MC |
1280 | { |
1281 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
0637c6f4 | 1282 | struct ext4_inode_info *ei = EXT4_I(inode); |
d2a17637 | 1283 | |
cd213226 MC |
1284 | if (!to_free) |
1285 | return; /* Nothing to release, exit */ | |
1286 | ||
d2a17637 | 1287 | spin_lock(&EXT4_I(inode)->i_block_reservation_lock); |
cd213226 | 1288 | |
5a58ec87 | 1289 | trace_ext4_da_release_space(inode, to_free); |
0637c6f4 | 1290 | if (unlikely(to_free > ei->i_reserved_data_blocks)) { |
cd213226 | 1291 | /* |
0637c6f4 TT |
1292 | * if there aren't enough reserved blocks, then the |
1293 | * counter is messed up somewhere. Since this | |
1294 | * function is called from invalidate page, it's | |
1295 | * harmless to return without any action. | |
cd213226 | 1296 | */ |
8de5c325 | 1297 | ext4_warning(inode->i_sb, "ext4_da_release_space: " |
0637c6f4 | 1298 | "ino %lu, to_free %d with only %d reserved " |
1084f252 | 1299 | "data blocks", inode->i_ino, to_free, |
0637c6f4 TT |
1300 | ei->i_reserved_data_blocks); |
1301 | WARN_ON(1); | |
1302 | to_free = ei->i_reserved_data_blocks; | |
cd213226 | 1303 | } |
0637c6f4 | 1304 | ei->i_reserved_data_blocks -= to_free; |
cd213226 | 1305 | |
0637c6f4 TT |
1306 | if (ei->i_reserved_data_blocks == 0) { |
1307 | /* | |
1308 | * We can release all of the reserved metadata blocks | |
1309 | * only when we have written all of the delayed | |
1310 | * allocation blocks. | |
7b415bf6 AK |
1311 | * Note that in case of bigalloc, i_reserved_meta_blocks, |
1312 | * i_reserved_data_blocks, etc. refer to number of clusters. | |
0637c6f4 | 1313 | */ |
57042651 | 1314 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, |
72b8ab9d | 1315 | ei->i_reserved_meta_blocks); |
ee5f4d9c | 1316 | ei->i_reserved_meta_blocks = 0; |
9d0be502 | 1317 | ei->i_da_metadata_calc_len = 0; |
0637c6f4 | 1318 | } |
d2a17637 | 1319 | |
72b8ab9d | 1320 | /* update fs dirty data blocks counter */ |
57042651 | 1321 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, to_free); |
d2a17637 | 1322 | |
d2a17637 | 1323 | spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); |
60e58e0f | 1324 | |
7b415bf6 | 1325 | dquot_release_reservation_block(inode, EXT4_C2B(sbi, to_free)); |
d2a17637 MC |
1326 | } |
1327 | ||
1328 | static void ext4_da_page_release_reservation(struct page *page, | |
de9a55b8 | 1329 | unsigned long offset) |
d2a17637 MC |
1330 | { |
1331 | int to_release = 0; | |
1332 | struct buffer_head *head, *bh; | |
1333 | unsigned int curr_off = 0; | |
7b415bf6 AK |
1334 | struct inode *inode = page->mapping->host; |
1335 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
1336 | int num_clusters; | |
51865fda | 1337 | ext4_fsblk_t lblk; |
d2a17637 MC |
1338 | |
1339 | head = page_buffers(page); | |
1340 | bh = head; | |
1341 | do { | |
1342 | unsigned int next_off = curr_off + bh->b_size; | |
1343 | ||
1344 | if ((offset <= curr_off) && (buffer_delay(bh))) { | |
1345 | to_release++; | |
1346 | clear_buffer_delay(bh); | |
1347 | } | |
1348 | curr_off = next_off; | |
1349 | } while ((bh = bh->b_this_page) != head); | |
7b415bf6 | 1350 | |
51865fda ZL |
1351 | if (to_release) { |
1352 | lblk = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1353 | ext4_es_remove_extent(inode, lblk, to_release); | |
1354 | } | |
1355 | ||
7b415bf6 AK |
1356 | /* If we have released all the blocks belonging to a cluster, then we |
1357 | * need to release the reserved space for that cluster. */ | |
1358 | num_clusters = EXT4_NUM_B2C(sbi, to_release); | |
1359 | while (num_clusters > 0) { | |
7b415bf6 AK |
1360 | lblk = (page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits)) + |
1361 | ((num_clusters - 1) << sbi->s_cluster_bits); | |
1362 | if (sbi->s_cluster_ratio == 1 || | |
7d1b1fbc | 1363 | !ext4_find_delalloc_cluster(inode, lblk)) |
7b415bf6 AK |
1364 | ext4_da_release_space(inode, 1); |
1365 | ||
1366 | num_clusters--; | |
1367 | } | |
d2a17637 | 1368 | } |
ac27a0ec | 1369 | |
64769240 AT |
1370 | /* |
1371 | * Delayed allocation stuff | |
1372 | */ | |
1373 | ||
64769240 AT |
1374 | /* |
1375 | * mpage_da_submit_io - walks through extent of pages and try to write | |
a1d6cc56 | 1376 | * them with writepage() call back |
64769240 AT |
1377 | * |
1378 | * @mpd->inode: inode | |
1379 | * @mpd->first_page: first page of the extent | |
1380 | * @mpd->next_page: page after the last page of the extent | |
64769240 AT |
1381 | * |
1382 | * By the time mpage_da_submit_io() is called we expect all blocks | |
1383 | * to be allocated. this may be wrong if allocation failed. | |
1384 | * | |
1385 | * As pages are already locked by write_cache_pages(), we can't use it | |
1386 | */ | |
1de3e3df TT |
1387 | static int mpage_da_submit_io(struct mpage_da_data *mpd, |
1388 | struct ext4_map_blocks *map) | |
64769240 | 1389 | { |
791b7f08 AK |
1390 | struct pagevec pvec; |
1391 | unsigned long index, end; | |
1392 | int ret = 0, err, nr_pages, i; | |
1393 | struct inode *inode = mpd->inode; | |
1394 | struct address_space *mapping = inode->i_mapping; | |
cb20d518 | 1395 | loff_t size = i_size_read(inode); |
3ecdb3a1 TT |
1396 | unsigned int len, block_start; |
1397 | struct buffer_head *bh, *page_bufs = NULL; | |
1de3e3df | 1398 | sector_t pblock = 0, cur_logical = 0; |
bd2d0210 | 1399 | struct ext4_io_submit io_submit; |
64769240 AT |
1400 | |
1401 | BUG_ON(mpd->next_page <= mpd->first_page); | |
bd2d0210 | 1402 | memset(&io_submit, 0, sizeof(io_submit)); |
791b7f08 AK |
1403 | /* |
1404 | * We need to start from the first_page to the next_page - 1 | |
1405 | * to make sure we also write the mapped dirty buffer_heads. | |
8dc207c0 | 1406 | * If we look at mpd->b_blocknr we would only be looking |
791b7f08 AK |
1407 | * at the currently mapped buffer_heads. |
1408 | */ | |
64769240 AT |
1409 | index = mpd->first_page; |
1410 | end = mpd->next_page - 1; | |
1411 | ||
791b7f08 | 1412 | pagevec_init(&pvec, 0); |
64769240 | 1413 | while (index <= end) { |
791b7f08 | 1414 | nr_pages = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE); |
64769240 AT |
1415 | if (nr_pages == 0) |
1416 | break; | |
1417 | for (i = 0; i < nr_pages; i++) { | |
f8bec370 | 1418 | int skip_page = 0; |
64769240 AT |
1419 | struct page *page = pvec.pages[i]; |
1420 | ||
791b7f08 AK |
1421 | index = page->index; |
1422 | if (index > end) | |
1423 | break; | |
cb20d518 TT |
1424 | |
1425 | if (index == size >> PAGE_CACHE_SHIFT) | |
1426 | len = size & ~PAGE_CACHE_MASK; | |
1427 | else | |
1428 | len = PAGE_CACHE_SIZE; | |
1de3e3df TT |
1429 | if (map) { |
1430 | cur_logical = index << (PAGE_CACHE_SHIFT - | |
1431 | inode->i_blkbits); | |
1432 | pblock = map->m_pblk + (cur_logical - | |
1433 | map->m_lblk); | |
1434 | } | |
791b7f08 AK |
1435 | index++; |
1436 | ||
1437 | BUG_ON(!PageLocked(page)); | |
1438 | BUG_ON(PageWriteback(page)); | |
1439 | ||
3ecdb3a1 TT |
1440 | bh = page_bufs = page_buffers(page); |
1441 | block_start = 0; | |
64769240 | 1442 | do { |
1de3e3df TT |
1443 | if (map && (cur_logical >= map->m_lblk) && |
1444 | (cur_logical <= (map->m_lblk + | |
1445 | (map->m_len - 1)))) { | |
29fa89d0 AK |
1446 | if (buffer_delay(bh)) { |
1447 | clear_buffer_delay(bh); | |
1448 | bh->b_blocknr = pblock; | |
29fa89d0 | 1449 | } |
1de3e3df TT |
1450 | if (buffer_unwritten(bh) || |
1451 | buffer_mapped(bh)) | |
1452 | BUG_ON(bh->b_blocknr != pblock); | |
1453 | if (map->m_flags & EXT4_MAP_UNINIT) | |
1454 | set_buffer_uninit(bh); | |
1455 | clear_buffer_unwritten(bh); | |
1456 | } | |
29fa89d0 | 1457 | |
13a79a47 YY |
1458 | /* |
1459 | * skip page if block allocation undone and | |
1460 | * block is dirty | |
1461 | */ | |
1462 | if (ext4_bh_delay_or_unwritten(NULL, bh)) | |
97498956 | 1463 | skip_page = 1; |
3ecdb3a1 TT |
1464 | bh = bh->b_this_page; |
1465 | block_start += bh->b_size; | |
64769240 AT |
1466 | cur_logical++; |
1467 | pblock++; | |
1de3e3df TT |
1468 | } while (bh != page_bufs); |
1469 | ||
f8bec370 JK |
1470 | if (skip_page) { |
1471 | unlock_page(page); | |
1472 | continue; | |
1473 | } | |
cb20d518 | 1474 | |
97498956 | 1475 | clear_page_dirty_for_io(page); |
fe089c77 JK |
1476 | err = ext4_bio_write_page(&io_submit, page, len, |
1477 | mpd->wbc); | |
cb20d518 | 1478 | if (!err) |
a1d6cc56 | 1479 | mpd->pages_written++; |
64769240 AT |
1480 | /* |
1481 | * In error case, we have to continue because | |
1482 | * remaining pages are still locked | |
64769240 AT |
1483 | */ |
1484 | if (ret == 0) | |
1485 | ret = err; | |
64769240 AT |
1486 | } |
1487 | pagevec_release(&pvec); | |
1488 | } | |
bd2d0210 | 1489 | ext4_io_submit(&io_submit); |
64769240 | 1490 | return ret; |
64769240 AT |
1491 | } |
1492 | ||
c7f5938a | 1493 | static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd) |
c4a0c46e AK |
1494 | { |
1495 | int nr_pages, i; | |
1496 | pgoff_t index, end; | |
1497 | struct pagevec pvec; | |
1498 | struct inode *inode = mpd->inode; | |
1499 | struct address_space *mapping = inode->i_mapping; | |
51865fda | 1500 | ext4_lblk_t start, last; |
c4a0c46e | 1501 | |
c7f5938a CW |
1502 | index = mpd->first_page; |
1503 | end = mpd->next_page - 1; | |
51865fda ZL |
1504 | |
1505 | start = index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1506 | last = end << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1507 | ext4_es_remove_extent(inode, start, last - start + 1); | |
1508 | ||
66bea92c | 1509 | pagevec_init(&pvec, 0); |
c4a0c46e AK |
1510 | while (index <= end) { |
1511 | nr_pages = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE); | |
1512 | if (nr_pages == 0) | |
1513 | break; | |
1514 | for (i = 0; i < nr_pages; i++) { | |
1515 | struct page *page = pvec.pages[i]; | |
9b1d0998 | 1516 | if (page->index > end) |
c4a0c46e | 1517 | break; |
c4a0c46e AK |
1518 | BUG_ON(!PageLocked(page)); |
1519 | BUG_ON(PageWriteback(page)); | |
1520 | block_invalidatepage(page, 0); | |
1521 | ClearPageUptodate(page); | |
1522 | unlock_page(page); | |
1523 | } | |
9b1d0998 JK |
1524 | index = pvec.pages[nr_pages - 1]->index + 1; |
1525 | pagevec_release(&pvec); | |
c4a0c46e AK |
1526 | } |
1527 | return; | |
1528 | } | |
1529 | ||
df22291f AK |
1530 | static void ext4_print_free_blocks(struct inode *inode) |
1531 | { | |
1532 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
92b97816 TT |
1533 | struct super_block *sb = inode->i_sb; |
1534 | ||
1535 | ext4_msg(sb, KERN_CRIT, "Total free blocks count %lld", | |
5dee5437 TT |
1536 | EXT4_C2B(EXT4_SB(inode->i_sb), |
1537 | ext4_count_free_clusters(inode->i_sb))); | |
92b97816 TT |
1538 | ext4_msg(sb, KERN_CRIT, "Free/Dirty block details"); |
1539 | ext4_msg(sb, KERN_CRIT, "free_blocks=%lld", | |
57042651 TT |
1540 | (long long) EXT4_C2B(EXT4_SB(inode->i_sb), |
1541 | percpu_counter_sum(&sbi->s_freeclusters_counter))); | |
92b97816 | 1542 | ext4_msg(sb, KERN_CRIT, "dirty_blocks=%lld", |
7b415bf6 AK |
1543 | (long long) EXT4_C2B(EXT4_SB(inode->i_sb), |
1544 | percpu_counter_sum(&sbi->s_dirtyclusters_counter))); | |
92b97816 TT |
1545 | ext4_msg(sb, KERN_CRIT, "Block reservation details"); |
1546 | ext4_msg(sb, KERN_CRIT, "i_reserved_data_blocks=%u", | |
1547 | EXT4_I(inode)->i_reserved_data_blocks); | |
1548 | ext4_msg(sb, KERN_CRIT, "i_reserved_meta_blocks=%u", | |
1693918e | 1549 | EXT4_I(inode)->i_reserved_meta_blocks); |
df22291f AK |
1550 | return; |
1551 | } | |
1552 | ||
64769240 | 1553 | /* |
5a87b7a5 TT |
1554 | * mpage_da_map_and_submit - go through given space, map them |
1555 | * if necessary, and then submit them for I/O | |
64769240 | 1556 | * |
8dc207c0 | 1557 | * @mpd - bh describing space |
64769240 AT |
1558 | * |
1559 | * The function skips space we know is already mapped to disk blocks. | |
1560 | * | |
64769240 | 1561 | */ |
5a87b7a5 | 1562 | static void mpage_da_map_and_submit(struct mpage_da_data *mpd) |
64769240 | 1563 | { |
2ac3b6e0 | 1564 | int err, blks, get_blocks_flags; |
1de3e3df | 1565 | struct ext4_map_blocks map, *mapp = NULL; |
2fa3cdfb TT |
1566 | sector_t next = mpd->b_blocknr; |
1567 | unsigned max_blocks = mpd->b_size >> mpd->inode->i_blkbits; | |
1568 | loff_t disksize = EXT4_I(mpd->inode)->i_disksize; | |
1569 | handle_t *handle = NULL; | |
64769240 AT |
1570 | |
1571 | /* | |
5a87b7a5 TT |
1572 | * If the blocks are mapped already, or we couldn't accumulate |
1573 | * any blocks, then proceed immediately to the submission stage. | |
2fa3cdfb | 1574 | */ |
5a87b7a5 TT |
1575 | if ((mpd->b_size == 0) || |
1576 | ((mpd->b_state & (1 << BH_Mapped)) && | |
1577 | !(mpd->b_state & (1 << BH_Delay)) && | |
1578 | !(mpd->b_state & (1 << BH_Unwritten)))) | |
1579 | goto submit_io; | |
2fa3cdfb TT |
1580 | |
1581 | handle = ext4_journal_current_handle(); | |
1582 | BUG_ON(!handle); | |
1583 | ||
79ffab34 | 1584 | /* |
79e83036 | 1585 | * Call ext4_map_blocks() to allocate any delayed allocation |
2ac3b6e0 TT |
1586 | * blocks, or to convert an uninitialized extent to be |
1587 | * initialized (in the case where we have written into | |
1588 | * one or more preallocated blocks). | |
1589 | * | |
1590 | * We pass in the magic EXT4_GET_BLOCKS_DELALLOC_RESERVE to | |
1591 | * indicate that we are on the delayed allocation path. This | |
1592 | * affects functions in many different parts of the allocation | |
1593 | * call path. This flag exists primarily because we don't | |
79e83036 | 1594 | * want to change *many* call functions, so ext4_map_blocks() |
f2321097 | 1595 | * will set the EXT4_STATE_DELALLOC_RESERVED flag once the |
2ac3b6e0 TT |
1596 | * inode's allocation semaphore is taken. |
1597 | * | |
1598 | * If the blocks in questions were delalloc blocks, set | |
1599 | * EXT4_GET_BLOCKS_DELALLOC_RESERVE so the delalloc accounting | |
1600 | * variables are updated after the blocks have been allocated. | |
79ffab34 | 1601 | */ |
2ed88685 TT |
1602 | map.m_lblk = next; |
1603 | map.m_len = max_blocks; | |
1296cc85 | 1604 | get_blocks_flags = EXT4_GET_BLOCKS_CREATE; |
744692dc JZ |
1605 | if (ext4_should_dioread_nolock(mpd->inode)) |
1606 | get_blocks_flags |= EXT4_GET_BLOCKS_IO_CREATE_EXT; | |
2ac3b6e0 | 1607 | if (mpd->b_state & (1 << BH_Delay)) |
1296cc85 AK |
1608 | get_blocks_flags |= EXT4_GET_BLOCKS_DELALLOC_RESERVE; |
1609 | ||
2ed88685 | 1610 | blks = ext4_map_blocks(handle, mpd->inode, &map, get_blocks_flags); |
2fa3cdfb | 1611 | if (blks < 0) { |
e3570639 ES |
1612 | struct super_block *sb = mpd->inode->i_sb; |
1613 | ||
2fa3cdfb | 1614 | err = blks; |
ed5bde0b | 1615 | /* |
5a87b7a5 | 1616 | * If get block returns EAGAIN or ENOSPC and there |
97498956 TT |
1617 | * appears to be free blocks we will just let |
1618 | * mpage_da_submit_io() unlock all of the pages. | |
c4a0c46e AK |
1619 | */ |
1620 | if (err == -EAGAIN) | |
5a87b7a5 | 1621 | goto submit_io; |
df22291f | 1622 | |
5dee5437 | 1623 | if (err == -ENOSPC && ext4_count_free_clusters(sb)) { |
df22291f | 1624 | mpd->retval = err; |
5a87b7a5 | 1625 | goto submit_io; |
df22291f AK |
1626 | } |
1627 | ||
c4a0c46e | 1628 | /* |
ed5bde0b TT |
1629 | * get block failure will cause us to loop in |
1630 | * writepages, because a_ops->writepage won't be able | |
1631 | * to make progress. The page will be redirtied by | |
1632 | * writepage and writepages will again try to write | |
1633 | * the same. | |
c4a0c46e | 1634 | */ |
e3570639 ES |
1635 | if (!(EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED)) { |
1636 | ext4_msg(sb, KERN_CRIT, | |
1637 | "delayed block allocation failed for inode %lu " | |
1638 | "at logical offset %llu with max blocks %zd " | |
1639 | "with error %d", mpd->inode->i_ino, | |
1640 | (unsigned long long) next, | |
1641 | mpd->b_size >> mpd->inode->i_blkbits, err); | |
1642 | ext4_msg(sb, KERN_CRIT, | |
01a523eb | 1643 | "This should not happen!! Data will be lost"); |
e3570639 ES |
1644 | if (err == -ENOSPC) |
1645 | ext4_print_free_blocks(mpd->inode); | |
030ba6bc | 1646 | } |
2fa3cdfb | 1647 | /* invalidate all the pages */ |
c7f5938a | 1648 | ext4_da_block_invalidatepages(mpd); |
e0fd9b90 CW |
1649 | |
1650 | /* Mark this page range as having been completed */ | |
1651 | mpd->io_done = 1; | |
5a87b7a5 | 1652 | return; |
c4a0c46e | 1653 | } |
2fa3cdfb TT |
1654 | BUG_ON(blks == 0); |
1655 | ||
1de3e3df | 1656 | mapp = ↦ |
2ed88685 TT |
1657 | if (map.m_flags & EXT4_MAP_NEW) { |
1658 | struct block_device *bdev = mpd->inode->i_sb->s_bdev; | |
1659 | int i; | |
64769240 | 1660 | |
2ed88685 TT |
1661 | for (i = 0; i < map.m_len; i++) |
1662 | unmap_underlying_metadata(bdev, map.m_pblk + i); | |
2fa3cdfb TT |
1663 | } |
1664 | ||
1665 | /* | |
03f5d8bc | 1666 | * Update on-disk size along with block allocation. |
2fa3cdfb TT |
1667 | */ |
1668 | disksize = ((loff_t) next + blks) << mpd->inode->i_blkbits; | |
1669 | if (disksize > i_size_read(mpd->inode)) | |
1670 | disksize = i_size_read(mpd->inode); | |
1671 | if (disksize > EXT4_I(mpd->inode)->i_disksize) { | |
1672 | ext4_update_i_disksize(mpd->inode, disksize); | |
5a87b7a5 TT |
1673 | err = ext4_mark_inode_dirty(handle, mpd->inode); |
1674 | if (err) | |
1675 | ext4_error(mpd->inode->i_sb, | |
1676 | "Failed to mark inode %lu dirty", | |
1677 | mpd->inode->i_ino); | |
2fa3cdfb TT |
1678 | } |
1679 | ||
5a87b7a5 | 1680 | submit_io: |
1de3e3df | 1681 | mpage_da_submit_io(mpd, mapp); |
5a87b7a5 | 1682 | mpd->io_done = 1; |
64769240 AT |
1683 | } |
1684 | ||
bf068ee2 AK |
1685 | #define BH_FLAGS ((1 << BH_Uptodate) | (1 << BH_Mapped) | \ |
1686 | (1 << BH_Delay) | (1 << BH_Unwritten)) | |
64769240 AT |
1687 | |
1688 | /* | |
1689 | * mpage_add_bh_to_extent - try to add one more block to extent of blocks | |
1690 | * | |
1691 | * @mpd->lbh - extent of blocks | |
1692 | * @logical - logical number of the block in the file | |
b6a8e62f | 1693 | * @b_state - b_state of the buffer head added |
64769240 AT |
1694 | * |
1695 | * the function is used to collect contig. blocks in same state | |
1696 | */ | |
b6a8e62f | 1697 | static void mpage_add_bh_to_extent(struct mpage_da_data *mpd, sector_t logical, |
8dc207c0 | 1698 | unsigned long b_state) |
64769240 | 1699 | { |
64769240 | 1700 | sector_t next; |
b6a8e62f JK |
1701 | int blkbits = mpd->inode->i_blkbits; |
1702 | int nrblocks = mpd->b_size >> blkbits; | |
64769240 | 1703 | |
c445e3e0 ES |
1704 | /* |
1705 | * XXX Don't go larger than mballoc is willing to allocate | |
1706 | * This is a stopgap solution. We eventually need to fold | |
1707 | * mpage_da_submit_io() into this function and then call | |
79e83036 | 1708 | * ext4_map_blocks() multiple times in a loop |
c445e3e0 | 1709 | */ |
b6a8e62f | 1710 | if (nrblocks >= (8*1024*1024 >> blkbits)) |
c445e3e0 ES |
1711 | goto flush_it; |
1712 | ||
b6a8e62f JK |
1713 | /* check if the reserved journal credits might overflow */ |
1714 | if (!ext4_test_inode_flag(mpd->inode, EXT4_INODE_EXTENTS)) { | |
525f4ed8 MC |
1715 | if (nrblocks >= EXT4_MAX_TRANS_DATA) { |
1716 | /* | |
1717 | * With non-extent format we are limited by the journal | |
1718 | * credit available. Total credit needed to insert | |
1719 | * nrblocks contiguous blocks is dependent on the | |
1720 | * nrblocks. So limit nrblocks. | |
1721 | */ | |
1722 | goto flush_it; | |
525f4ed8 MC |
1723 | } |
1724 | } | |
64769240 AT |
1725 | /* |
1726 | * First block in the extent | |
1727 | */ | |
8dc207c0 TT |
1728 | if (mpd->b_size == 0) { |
1729 | mpd->b_blocknr = logical; | |
b6a8e62f | 1730 | mpd->b_size = 1 << blkbits; |
8dc207c0 | 1731 | mpd->b_state = b_state & BH_FLAGS; |
64769240 AT |
1732 | return; |
1733 | } | |
1734 | ||
8dc207c0 | 1735 | next = mpd->b_blocknr + nrblocks; |
64769240 AT |
1736 | /* |
1737 | * Can we merge the block to our big extent? | |
1738 | */ | |
8dc207c0 | 1739 | if (logical == next && (b_state & BH_FLAGS) == mpd->b_state) { |
b6a8e62f | 1740 | mpd->b_size += 1 << blkbits; |
64769240 AT |
1741 | return; |
1742 | } | |
1743 | ||
525f4ed8 | 1744 | flush_it: |
64769240 AT |
1745 | /* |
1746 | * We couldn't merge the block to our extent, so we | |
1747 | * need to flush current extent and start new one | |
1748 | */ | |
5a87b7a5 | 1749 | mpage_da_map_and_submit(mpd); |
a1d6cc56 | 1750 | return; |
64769240 AT |
1751 | } |
1752 | ||
c364b22c | 1753 | static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh) |
29fa89d0 | 1754 | { |
c364b22c | 1755 | return (buffer_delay(bh) || buffer_unwritten(bh)) && buffer_dirty(bh); |
29fa89d0 AK |
1756 | } |
1757 | ||
5356f261 AK |
1758 | /* |
1759 | * This function is grabs code from the very beginning of | |
1760 | * ext4_map_blocks, but assumes that the caller is from delayed write | |
1761 | * time. This function looks up the requested blocks and sets the | |
1762 | * buffer delay bit under the protection of i_data_sem. | |
1763 | */ | |
1764 | static int ext4_da_map_blocks(struct inode *inode, sector_t iblock, | |
1765 | struct ext4_map_blocks *map, | |
1766 | struct buffer_head *bh) | |
1767 | { | |
d100eef2 | 1768 | struct extent_status es; |
5356f261 AK |
1769 | int retval; |
1770 | sector_t invalid_block = ~((sector_t) 0xffff); | |
1771 | ||
1772 | if (invalid_block < ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es)) | |
1773 | invalid_block = ~0; | |
1774 | ||
1775 | map->m_flags = 0; | |
1776 | ext_debug("ext4_da_map_blocks(): inode %lu, max_blocks %u," | |
1777 | "logical block %lu\n", inode->i_ino, map->m_len, | |
1778 | (unsigned long) map->m_lblk); | |
d100eef2 ZL |
1779 | |
1780 | /* Lookup extent status tree firstly */ | |
1781 | if (ext4_es_lookup_extent(inode, iblock, &es)) { | |
1782 | ||
1783 | if (ext4_es_is_hole(&es)) { | |
1784 | retval = 0; | |
1785 | down_read((&EXT4_I(inode)->i_data_sem)); | |
1786 | goto add_delayed; | |
1787 | } | |
1788 | ||
1789 | /* | |
1790 | * Delayed extent could be allocated by fallocate. | |
1791 | * So we need to check it. | |
1792 | */ | |
1793 | if (ext4_es_is_delayed(&es) && !ext4_es_is_unwritten(&es)) { | |
1794 | map_bh(bh, inode->i_sb, invalid_block); | |
1795 | set_buffer_new(bh); | |
1796 | set_buffer_delay(bh); | |
1797 | return 0; | |
1798 | } | |
1799 | ||
1800 | map->m_pblk = ext4_es_pblock(&es) + iblock - es.es_lblk; | |
1801 | retval = es.es_len - (iblock - es.es_lblk); | |
1802 | if (retval > map->m_len) | |
1803 | retval = map->m_len; | |
1804 | map->m_len = retval; | |
1805 | if (ext4_es_is_written(&es)) | |
1806 | map->m_flags |= EXT4_MAP_MAPPED; | |
1807 | else if (ext4_es_is_unwritten(&es)) | |
1808 | map->m_flags |= EXT4_MAP_UNWRITTEN; | |
1809 | else | |
1810 | BUG_ON(1); | |
1811 | ||
1812 | return retval; | |
1813 | } | |
1814 | ||
5356f261 AK |
1815 | /* |
1816 | * Try to see if we can get the block without requesting a new | |
1817 | * file system block. | |
1818 | */ | |
1819 | down_read((&EXT4_I(inode)->i_data_sem)); | |
9c3569b5 TM |
1820 | if (ext4_has_inline_data(inode)) { |
1821 | /* | |
1822 | * We will soon create blocks for this page, and let | |
1823 | * us pretend as if the blocks aren't allocated yet. | |
1824 | * In case of clusters, we have to handle the work | |
1825 | * of mapping from cluster so that the reserved space | |
1826 | * is calculated properly. | |
1827 | */ | |
1828 | if ((EXT4_SB(inode->i_sb)->s_cluster_ratio > 1) && | |
1829 | ext4_find_delalloc_cluster(inode, map->m_lblk)) | |
1830 | map->m_flags |= EXT4_MAP_FROM_CLUSTER; | |
1831 | retval = 0; | |
1832 | } else if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) | |
d100eef2 ZL |
1833 | retval = ext4_ext_map_blocks(NULL, inode, map, |
1834 | EXT4_GET_BLOCKS_NO_PUT_HOLE); | |
5356f261 | 1835 | else |
d100eef2 ZL |
1836 | retval = ext4_ind_map_blocks(NULL, inode, map, |
1837 | EXT4_GET_BLOCKS_NO_PUT_HOLE); | |
5356f261 | 1838 | |
d100eef2 | 1839 | add_delayed: |
5356f261 | 1840 | if (retval == 0) { |
f7fec032 | 1841 | int ret; |
5356f261 AK |
1842 | /* |
1843 | * XXX: __block_prepare_write() unmaps passed block, | |
1844 | * is it OK? | |
1845 | */ | |
1846 | /* If the block was allocated from previously allocated cluster, | |
1847 | * then we dont need to reserve it again. */ | |
1848 | if (!(map->m_flags & EXT4_MAP_FROM_CLUSTER)) { | |
f7fec032 ZL |
1849 | ret = ext4_da_reserve_space(inode, iblock); |
1850 | if (ret) { | |
5356f261 | 1851 | /* not enough space to reserve */ |
f7fec032 | 1852 | retval = ret; |
5356f261 | 1853 | goto out_unlock; |
f7fec032 | 1854 | } |
5356f261 AK |
1855 | } |
1856 | ||
f7fec032 ZL |
1857 | ret = ext4_es_insert_extent(inode, map->m_lblk, map->m_len, |
1858 | ~0, EXTENT_STATUS_DELAYED); | |
1859 | if (ret) { | |
1860 | retval = ret; | |
51865fda | 1861 | goto out_unlock; |
f7fec032 | 1862 | } |
51865fda | 1863 | |
5356f261 AK |
1864 | /* Clear EXT4_MAP_FROM_CLUSTER flag since its purpose is served |
1865 | * and it should not appear on the bh->b_state. | |
1866 | */ | |
1867 | map->m_flags &= ~EXT4_MAP_FROM_CLUSTER; | |
1868 | ||
1869 | map_bh(bh, inode->i_sb, invalid_block); | |
1870 | set_buffer_new(bh); | |
1871 | set_buffer_delay(bh); | |
f7fec032 ZL |
1872 | } else if (retval > 0) { |
1873 | int ret; | |
1874 | unsigned long long status; | |
1875 | ||
1876 | status = map->m_flags & EXT4_MAP_UNWRITTEN ? | |
1877 | EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN; | |
1878 | ret = ext4_es_insert_extent(inode, map->m_lblk, map->m_len, | |
1879 | map->m_pblk, status); | |
1880 | if (ret != 0) | |
1881 | retval = ret; | |
5356f261 AK |
1882 | } |
1883 | ||
1884 | out_unlock: | |
1885 | up_read((&EXT4_I(inode)->i_data_sem)); | |
1886 | ||
1887 | return retval; | |
1888 | } | |
1889 | ||
64769240 | 1890 | /* |
b920c755 TT |
1891 | * This is a special get_blocks_t callback which is used by |
1892 | * ext4_da_write_begin(). It will either return mapped block or | |
1893 | * reserve space for a single block. | |
29fa89d0 AK |
1894 | * |
1895 | * For delayed buffer_head we have BH_Mapped, BH_New, BH_Delay set. | |
1896 | * We also have b_blocknr = -1 and b_bdev initialized properly | |
1897 | * | |
1898 | * For unwritten buffer_head we have BH_Mapped, BH_New, BH_Unwritten set. | |
1899 | * We also have b_blocknr = physicalblock mapping unwritten extent and b_bdev | |
1900 | * initialized properly. | |
64769240 | 1901 | */ |
9c3569b5 TM |
1902 | int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, |
1903 | struct buffer_head *bh, int create) | |
64769240 | 1904 | { |
2ed88685 | 1905 | struct ext4_map_blocks map; |
64769240 AT |
1906 | int ret = 0; |
1907 | ||
1908 | BUG_ON(create == 0); | |
2ed88685 TT |
1909 | BUG_ON(bh->b_size != inode->i_sb->s_blocksize); |
1910 | ||
1911 | map.m_lblk = iblock; | |
1912 | map.m_len = 1; | |
64769240 AT |
1913 | |
1914 | /* | |
1915 | * first, we need to know whether the block is allocated already | |
1916 | * preallocated blocks are unmapped but should treated | |
1917 | * the same as allocated blocks. | |
1918 | */ | |
5356f261 AK |
1919 | ret = ext4_da_map_blocks(inode, iblock, &map, bh); |
1920 | if (ret <= 0) | |
2ed88685 | 1921 | return ret; |
64769240 | 1922 | |
2ed88685 TT |
1923 | map_bh(bh, inode->i_sb, map.m_pblk); |
1924 | bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags; | |
1925 | ||
1926 | if (buffer_unwritten(bh)) { | |
1927 | /* A delayed write to unwritten bh should be marked | |
1928 | * new and mapped. Mapped ensures that we don't do | |
1929 | * get_block multiple times when we write to the same | |
1930 | * offset and new ensures that we do proper zero out | |
1931 | * for partial write. | |
1932 | */ | |
1933 | set_buffer_new(bh); | |
c8205636 | 1934 | set_buffer_mapped(bh); |
2ed88685 TT |
1935 | } |
1936 | return 0; | |
64769240 | 1937 | } |
61628a3f | 1938 | |
62e086be AK |
1939 | static int bget_one(handle_t *handle, struct buffer_head *bh) |
1940 | { | |
1941 | get_bh(bh); | |
1942 | return 0; | |
1943 | } | |
1944 | ||
1945 | static int bput_one(handle_t *handle, struct buffer_head *bh) | |
1946 | { | |
1947 | put_bh(bh); | |
1948 | return 0; | |
1949 | } | |
1950 | ||
1951 | static int __ext4_journalled_writepage(struct page *page, | |
62e086be AK |
1952 | unsigned int len) |
1953 | { | |
1954 | struct address_space *mapping = page->mapping; | |
1955 | struct inode *inode = mapping->host; | |
3fdcfb66 | 1956 | struct buffer_head *page_bufs = NULL; |
62e086be | 1957 | handle_t *handle = NULL; |
3fdcfb66 TM |
1958 | int ret = 0, err = 0; |
1959 | int inline_data = ext4_has_inline_data(inode); | |
1960 | struct buffer_head *inode_bh = NULL; | |
62e086be | 1961 | |
cb20d518 | 1962 | ClearPageChecked(page); |
3fdcfb66 TM |
1963 | |
1964 | if (inline_data) { | |
1965 | BUG_ON(page->index != 0); | |
1966 | BUG_ON(len > ext4_get_max_inline_size(inode)); | |
1967 | inode_bh = ext4_journalled_write_inline_data(inode, len, page); | |
1968 | if (inode_bh == NULL) | |
1969 | goto out; | |
1970 | } else { | |
1971 | page_bufs = page_buffers(page); | |
1972 | if (!page_bufs) { | |
1973 | BUG(); | |
1974 | goto out; | |
1975 | } | |
1976 | ext4_walk_page_buffers(handle, page_bufs, 0, len, | |
1977 | NULL, bget_one); | |
1978 | } | |
62e086be AK |
1979 | /* As soon as we unlock the page, it can go away, but we have |
1980 | * references to buffers so we are safe */ | |
1981 | unlock_page(page); | |
1982 | ||
9924a92a TT |
1983 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, |
1984 | ext4_writepage_trans_blocks(inode)); | |
62e086be AK |
1985 | if (IS_ERR(handle)) { |
1986 | ret = PTR_ERR(handle); | |
1987 | goto out; | |
1988 | } | |
1989 | ||
441c8508 CW |
1990 | BUG_ON(!ext4_handle_valid(handle)); |
1991 | ||
3fdcfb66 TM |
1992 | if (inline_data) { |
1993 | ret = ext4_journal_get_write_access(handle, inode_bh); | |
62e086be | 1994 | |
3fdcfb66 TM |
1995 | err = ext4_handle_dirty_metadata(handle, inode, inode_bh); |
1996 | ||
1997 | } else { | |
1998 | ret = ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL, | |
1999 | do_journal_get_write_access); | |
2000 | ||
2001 | err = ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL, | |
2002 | write_end_fn); | |
2003 | } | |
62e086be AK |
2004 | if (ret == 0) |
2005 | ret = err; | |
2d859db3 | 2006 | EXT4_I(inode)->i_datasync_tid = handle->h_transaction->t_tid; |
62e086be AK |
2007 | err = ext4_journal_stop(handle); |
2008 | if (!ret) | |
2009 | ret = err; | |
2010 | ||
3fdcfb66 TM |
2011 | if (!ext4_has_inline_data(inode)) |
2012 | ext4_walk_page_buffers(handle, page_bufs, 0, len, | |
2013 | NULL, bput_one); | |
19f5fb7a | 2014 | ext4_set_inode_state(inode, EXT4_STATE_JDATA); |
62e086be | 2015 | out: |
3fdcfb66 | 2016 | brelse(inode_bh); |
62e086be AK |
2017 | return ret; |
2018 | } | |
2019 | ||
61628a3f | 2020 | /* |
43ce1d23 AK |
2021 | * Note that we don't need to start a transaction unless we're journaling data |
2022 | * because we should have holes filled from ext4_page_mkwrite(). We even don't | |
2023 | * need to file the inode to the transaction's list in ordered mode because if | |
2024 | * we are writing back data added by write(), the inode is already there and if | |
25985edc | 2025 | * we are writing back data modified via mmap(), no one guarantees in which |
43ce1d23 AK |
2026 | * transaction the data will hit the disk. In case we are journaling data, we |
2027 | * cannot start transaction directly because transaction start ranks above page | |
2028 | * lock so we have to do some magic. | |
2029 | * | |
b920c755 TT |
2030 | * This function can get called via... |
2031 | * - ext4_da_writepages after taking page lock (have journal handle) | |
2032 | * - journal_submit_inode_data_buffers (no journal handle) | |
f6463b0d | 2033 | * - shrink_page_list via the kswapd/direct reclaim (no journal handle) |
b920c755 | 2034 | * - grab_page_cache when doing write_begin (have journal handle) |
43ce1d23 AK |
2035 | * |
2036 | * We don't do any block allocation in this function. If we have page with | |
2037 | * multiple blocks we need to write those buffer_heads that are mapped. This | |
2038 | * is important for mmaped based write. So if we do with blocksize 1K | |
2039 | * truncate(f, 1024); | |
2040 | * a = mmap(f, 0, 4096); | |
2041 | * a[0] = 'a'; | |
2042 | * truncate(f, 4096); | |
2043 | * we have in the page first buffer_head mapped via page_mkwrite call back | |
90802ed9 | 2044 | * but other buffer_heads would be unmapped but dirty (dirty done via the |
43ce1d23 AK |
2045 | * do_wp_page). So writepage should write the first block. If we modify |
2046 | * the mmap area beyond 1024 we will again get a page_fault and the | |
2047 | * page_mkwrite callback will do the block allocation and mark the | |
2048 | * buffer_heads mapped. | |
2049 | * | |
2050 | * We redirty the page if we have any buffer_heads that is either delay or | |
2051 | * unwritten in the page. | |
2052 | * | |
2053 | * We can get recursively called as show below. | |
2054 | * | |
2055 | * ext4_writepage() -> kmalloc() -> __alloc_pages() -> page_launder() -> | |
2056 | * ext4_writepage() | |
2057 | * | |
2058 | * But since we don't do any block allocation we should not deadlock. | |
2059 | * Page also have the dirty flag cleared so we don't get recurive page_lock. | |
61628a3f | 2060 | */ |
43ce1d23 | 2061 | static int ext4_writepage(struct page *page, |
62e086be | 2062 | struct writeback_control *wbc) |
64769240 | 2063 | { |
f8bec370 | 2064 | int ret = 0; |
61628a3f | 2065 | loff_t size; |
498e5f24 | 2066 | unsigned int len; |
744692dc | 2067 | struct buffer_head *page_bufs = NULL; |
61628a3f | 2068 | struct inode *inode = page->mapping->host; |
36ade451 | 2069 | struct ext4_io_submit io_submit; |
61628a3f | 2070 | |
a9c667f8 | 2071 | trace_ext4_writepage(page); |
f0e6c985 AK |
2072 | size = i_size_read(inode); |
2073 | if (page->index == size >> PAGE_CACHE_SHIFT) | |
2074 | len = size & ~PAGE_CACHE_MASK; | |
2075 | else | |
2076 | len = PAGE_CACHE_SIZE; | |
64769240 | 2077 | |
a42afc5f | 2078 | page_bufs = page_buffers(page); |
a42afc5f | 2079 | /* |
fe386132 JK |
2080 | * We cannot do block allocation or other extent handling in this |
2081 | * function. If there are buffers needing that, we have to redirty | |
2082 | * the page. But we may reach here when we do a journal commit via | |
2083 | * journal_submit_inode_data_buffers() and in that case we must write | |
2084 | * allocated buffers to achieve data=ordered mode guarantees. | |
a42afc5f | 2085 | */ |
f19d5870 TM |
2086 | if (ext4_walk_page_buffers(NULL, page_bufs, 0, len, NULL, |
2087 | ext4_bh_delay_or_unwritten)) { | |
f8bec370 | 2088 | redirty_page_for_writepage(wbc, page); |
fe386132 JK |
2089 | if (current->flags & PF_MEMALLOC) { |
2090 | /* | |
2091 | * For memory cleaning there's no point in writing only | |
2092 | * some buffers. So just bail out. Warn if we came here | |
2093 | * from direct reclaim. | |
2094 | */ | |
2095 | WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) | |
2096 | == PF_MEMALLOC); | |
f0e6c985 AK |
2097 | unlock_page(page); |
2098 | return 0; | |
2099 | } | |
a42afc5f | 2100 | } |
64769240 | 2101 | |
cb20d518 | 2102 | if (PageChecked(page) && ext4_should_journal_data(inode)) |
43ce1d23 AK |
2103 | /* |
2104 | * It's mmapped pagecache. Add buffers and journal it. There | |
2105 | * doesn't seem much point in redirtying the page here. | |
2106 | */ | |
3f0ca309 | 2107 | return __ext4_journalled_writepage(page, len); |
43ce1d23 | 2108 | |
36ade451 JK |
2109 | memset(&io_submit, 0, sizeof(io_submit)); |
2110 | ret = ext4_bio_write_page(&io_submit, page, len, wbc); | |
2111 | ext4_io_submit(&io_submit); | |
64769240 AT |
2112 | return ret; |
2113 | } | |
2114 | ||
61628a3f | 2115 | /* |
525f4ed8 | 2116 | * This is called via ext4_da_writepages() to |
25985edc | 2117 | * calculate the total number of credits to reserve to fit |
525f4ed8 MC |
2118 | * a single extent allocation into a single transaction, |
2119 | * ext4_da_writpeages() will loop calling this before | |
2120 | * the block allocation. | |
61628a3f | 2121 | */ |
525f4ed8 MC |
2122 | |
2123 | static int ext4_da_writepages_trans_blocks(struct inode *inode) | |
2124 | { | |
2125 | int max_blocks = EXT4_I(inode)->i_reserved_data_blocks; | |
2126 | ||
2127 | /* | |
2128 | * With non-extent format the journal credit needed to | |
2129 | * insert nrblocks contiguous block is dependent on | |
2130 | * number of contiguous block. So we will limit | |
2131 | * number of contiguous block to a sane value | |
2132 | */ | |
12e9b892 | 2133 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) && |
525f4ed8 MC |
2134 | (max_blocks > EXT4_MAX_TRANS_DATA)) |
2135 | max_blocks = EXT4_MAX_TRANS_DATA; | |
2136 | ||
2137 | return ext4_chunk_trans_blocks(inode, max_blocks); | |
2138 | } | |
61628a3f | 2139 | |
8e48dcfb TT |
2140 | /* |
2141 | * write_cache_pages_da - walk the list of dirty pages of the given | |
8eb9e5ce | 2142 | * address space and accumulate pages that need writing, and call |
168fc022 TT |
2143 | * mpage_da_map_and_submit to map a single contiguous memory region |
2144 | * and then write them. | |
8e48dcfb | 2145 | */ |
9c3569b5 TM |
2146 | static int write_cache_pages_da(handle_t *handle, |
2147 | struct address_space *mapping, | |
8e48dcfb | 2148 | struct writeback_control *wbc, |
72f84e65 ES |
2149 | struct mpage_da_data *mpd, |
2150 | pgoff_t *done_index) | |
8e48dcfb | 2151 | { |
4f01b02c | 2152 | struct buffer_head *bh, *head; |
168fc022 | 2153 | struct inode *inode = mapping->host; |
4f01b02c TT |
2154 | struct pagevec pvec; |
2155 | unsigned int nr_pages; | |
2156 | sector_t logical; | |
2157 | pgoff_t index, end; | |
2158 | long nr_to_write = wbc->nr_to_write; | |
2159 | int i, tag, ret = 0; | |
8e48dcfb | 2160 | |
168fc022 TT |
2161 | memset(mpd, 0, sizeof(struct mpage_da_data)); |
2162 | mpd->wbc = wbc; | |
2163 | mpd->inode = inode; | |
8e48dcfb TT |
2164 | pagevec_init(&pvec, 0); |
2165 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
2166 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
2167 | ||
6e6938b6 | 2168 | if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) |
5b41d924 ES |
2169 | tag = PAGECACHE_TAG_TOWRITE; |
2170 | else | |
2171 | tag = PAGECACHE_TAG_DIRTY; | |
2172 | ||
72f84e65 | 2173 | *done_index = index; |
4f01b02c | 2174 | while (index <= end) { |
5b41d924 | 2175 | nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
8e48dcfb TT |
2176 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1); |
2177 | if (nr_pages == 0) | |
4f01b02c | 2178 | return 0; |
8e48dcfb TT |
2179 | |
2180 | for (i = 0; i < nr_pages; i++) { | |
2181 | struct page *page = pvec.pages[i]; | |
2182 | ||
2183 | /* | |
2184 | * At this point, the page may be truncated or | |
2185 | * invalidated (changing page->mapping to NULL), or | |
2186 | * even swizzled back from swapper_space to tmpfs file | |
2187 | * mapping. However, page->index will not change | |
2188 | * because we have a reference on the page. | |
2189 | */ | |
4f01b02c TT |
2190 | if (page->index > end) |
2191 | goto out; | |
8e48dcfb | 2192 | |
72f84e65 ES |
2193 | *done_index = page->index + 1; |
2194 | ||
78aaced3 TT |
2195 | /* |
2196 | * If we can't merge this page, and we have | |
2197 | * accumulated an contiguous region, write it | |
2198 | */ | |
2199 | if ((mpd->next_page != page->index) && | |
2200 | (mpd->next_page != mpd->first_page)) { | |
2201 | mpage_da_map_and_submit(mpd); | |
2202 | goto ret_extent_tail; | |
2203 | } | |
2204 | ||
8e48dcfb TT |
2205 | lock_page(page); |
2206 | ||
2207 | /* | |
4f01b02c TT |
2208 | * If the page is no longer dirty, or its |
2209 | * mapping no longer corresponds to inode we | |
2210 | * are writing (which means it has been | |
2211 | * truncated or invalidated), or the page is | |
2212 | * already under writeback and we are not | |
2213 | * doing a data integrity writeback, skip the page | |
8e48dcfb | 2214 | */ |
4f01b02c TT |
2215 | if (!PageDirty(page) || |
2216 | (PageWriteback(page) && | |
2217 | (wbc->sync_mode == WB_SYNC_NONE)) || | |
2218 | unlikely(page->mapping != mapping)) { | |
8e48dcfb TT |
2219 | unlock_page(page); |
2220 | continue; | |
2221 | } | |
2222 | ||
7cb1a535 | 2223 | wait_on_page_writeback(page); |
8e48dcfb | 2224 | BUG_ON(PageWriteback(page)); |
8e48dcfb | 2225 | |
9c3569b5 TM |
2226 | /* |
2227 | * If we have inline data and arrive here, it means that | |
2228 | * we will soon create the block for the 1st page, so | |
2229 | * we'd better clear the inline data here. | |
2230 | */ | |
2231 | if (ext4_has_inline_data(inode)) { | |
2232 | BUG_ON(ext4_test_inode_state(inode, | |
2233 | EXT4_STATE_MAY_INLINE_DATA)); | |
2234 | ext4_destroy_inline_data(handle, inode); | |
2235 | } | |
2236 | ||
168fc022 | 2237 | if (mpd->next_page != page->index) |
8eb9e5ce | 2238 | mpd->first_page = page->index; |
8eb9e5ce TT |
2239 | mpd->next_page = page->index + 1; |
2240 | logical = (sector_t) page->index << | |
2241 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
2242 | ||
f8bec370 JK |
2243 | /* Add all dirty buffers to mpd */ |
2244 | head = page_buffers(page); | |
2245 | bh = head; | |
2246 | do { | |
2247 | BUG_ON(buffer_locked(bh)); | |
8eb9e5ce | 2248 | /* |
f8bec370 JK |
2249 | * We need to try to allocate unmapped blocks |
2250 | * in the same page. Otherwise we won't make | |
2251 | * progress with the page in ext4_writepage | |
8eb9e5ce | 2252 | */ |
f8bec370 JK |
2253 | if (ext4_bh_delay_or_unwritten(NULL, bh)) { |
2254 | mpage_add_bh_to_extent(mpd, logical, | |
f8bec370 JK |
2255 | bh->b_state); |
2256 | if (mpd->io_done) | |
2257 | goto ret_extent_tail; | |
2258 | } else if (buffer_dirty(bh) && | |
2259 | buffer_mapped(bh)) { | |
8eb9e5ce | 2260 | /* |
f8bec370 JK |
2261 | * mapped dirty buffer. We need to |
2262 | * update the b_state because we look | |
2263 | * at b_state in mpage_da_map_blocks. | |
2264 | * We don't update b_size because if we | |
2265 | * find an unmapped buffer_head later | |
2266 | * we need to use the b_state flag of | |
2267 | * that buffer_head. | |
8eb9e5ce | 2268 | */ |
f8bec370 JK |
2269 | if (mpd->b_size == 0) |
2270 | mpd->b_state = | |
2271 | bh->b_state & BH_FLAGS; | |
2272 | } | |
2273 | logical++; | |
2274 | } while ((bh = bh->b_this_page) != head); | |
8e48dcfb TT |
2275 | |
2276 | if (nr_to_write > 0) { | |
2277 | nr_to_write--; | |
2278 | if (nr_to_write == 0 && | |
4f01b02c | 2279 | wbc->sync_mode == WB_SYNC_NONE) |
8e48dcfb TT |
2280 | /* |
2281 | * We stop writing back only if we are | |
2282 | * not doing integrity sync. In case of | |
2283 | * integrity sync we have to keep going | |
2284 | * because someone may be concurrently | |
2285 | * dirtying pages, and we might have | |
2286 | * synced a lot of newly appeared dirty | |
2287 | * pages, but have not synced all of the | |
2288 | * old dirty pages. | |
2289 | */ | |
4f01b02c | 2290 | goto out; |
8e48dcfb TT |
2291 | } |
2292 | } | |
2293 | pagevec_release(&pvec); | |
2294 | cond_resched(); | |
2295 | } | |
4f01b02c TT |
2296 | return 0; |
2297 | ret_extent_tail: | |
2298 | ret = MPAGE_DA_EXTENT_TAIL; | |
8eb9e5ce TT |
2299 | out: |
2300 | pagevec_release(&pvec); | |
2301 | cond_resched(); | |
8e48dcfb TT |
2302 | return ret; |
2303 | } | |
2304 | ||
2305 | ||
64769240 | 2306 | static int ext4_da_writepages(struct address_space *mapping, |
a1d6cc56 | 2307 | struct writeback_control *wbc) |
64769240 | 2308 | { |
22208ded AK |
2309 | pgoff_t index; |
2310 | int range_whole = 0; | |
61628a3f | 2311 | handle_t *handle = NULL; |
df22291f | 2312 | struct mpage_da_data mpd; |
5e745b04 | 2313 | struct inode *inode = mapping->host; |
498e5f24 | 2314 | int pages_written = 0; |
55138e0b | 2315 | unsigned int max_pages; |
2acf2c26 | 2316 | int range_cyclic, cycled = 1, io_done = 0; |
55138e0b TT |
2317 | int needed_blocks, ret = 0; |
2318 | long desired_nr_to_write, nr_to_writebump = 0; | |
de89de6e | 2319 | loff_t range_start = wbc->range_start; |
5e745b04 | 2320 | struct ext4_sb_info *sbi = EXT4_SB(mapping->host->i_sb); |
72f84e65 | 2321 | pgoff_t done_index = 0; |
5b41d924 | 2322 | pgoff_t end; |
1bce63d1 | 2323 | struct blk_plug plug; |
61628a3f | 2324 | |
9bffad1e | 2325 | trace_ext4_da_writepages(inode, wbc); |
ba80b101 | 2326 | |
61628a3f MC |
2327 | /* |
2328 | * No pages to write? This is mainly a kludge to avoid starting | |
2329 | * a transaction for special inodes like journal inode on last iput() | |
2330 | * because that could violate lock ordering on umount | |
2331 | */ | |
a1d6cc56 | 2332 | if (!mapping->nrpages || !mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) |
61628a3f | 2333 | return 0; |
2a21e37e TT |
2334 | |
2335 | /* | |
2336 | * If the filesystem has aborted, it is read-only, so return | |
2337 | * right away instead of dumping stack traces later on that | |
2338 | * will obscure the real source of the problem. We test | |
4ab2f15b | 2339 | * EXT4_MF_FS_ABORTED instead of sb->s_flag's MS_RDONLY because |
2a21e37e TT |
2340 | * the latter could be true if the filesystem is mounted |
2341 | * read-only, and in that case, ext4_da_writepages should | |
2342 | * *never* be called, so if that ever happens, we would want | |
2343 | * the stack trace. | |
2344 | */ | |
4ab2f15b | 2345 | if (unlikely(sbi->s_mount_flags & EXT4_MF_FS_ABORTED)) |
2a21e37e TT |
2346 | return -EROFS; |
2347 | ||
22208ded AK |
2348 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
2349 | range_whole = 1; | |
61628a3f | 2350 | |
2acf2c26 AK |
2351 | range_cyclic = wbc->range_cyclic; |
2352 | if (wbc->range_cyclic) { | |
22208ded | 2353 | index = mapping->writeback_index; |
2acf2c26 AK |
2354 | if (index) |
2355 | cycled = 0; | |
2356 | wbc->range_start = index << PAGE_CACHE_SHIFT; | |
2357 | wbc->range_end = LLONG_MAX; | |
2358 | wbc->range_cyclic = 0; | |
5b41d924 ES |
2359 | end = -1; |
2360 | } else { | |
22208ded | 2361 | index = wbc->range_start >> PAGE_CACHE_SHIFT; |
5b41d924 ES |
2362 | end = wbc->range_end >> PAGE_CACHE_SHIFT; |
2363 | } | |
a1d6cc56 | 2364 | |
55138e0b TT |
2365 | /* |
2366 | * This works around two forms of stupidity. The first is in | |
2367 | * the writeback code, which caps the maximum number of pages | |
2368 | * written to be 1024 pages. This is wrong on multiple | |
2369 | * levels; different architectues have a different page size, | |
2370 | * which changes the maximum amount of data which gets | |
2371 | * written. Secondly, 4 megabytes is way too small. XFS | |
2372 | * forces this value to be 16 megabytes by multiplying | |
2373 | * nr_to_write parameter by four, and then relies on its | |
2374 | * allocator to allocate larger extents to make them | |
2375 | * contiguous. Unfortunately this brings us to the second | |
2376 | * stupidity, which is that ext4's mballoc code only allocates | |
2377 | * at most 2048 blocks. So we force contiguous writes up to | |
2378 | * the number of dirty blocks in the inode, or | |
2379 | * sbi->max_writeback_mb_bump whichever is smaller. | |
2380 | */ | |
2381 | max_pages = sbi->s_max_writeback_mb_bump << (20 - PAGE_CACHE_SHIFT); | |
b443e733 ES |
2382 | if (!range_cyclic && range_whole) { |
2383 | if (wbc->nr_to_write == LONG_MAX) | |
2384 | desired_nr_to_write = wbc->nr_to_write; | |
2385 | else | |
2386 | desired_nr_to_write = wbc->nr_to_write * 8; | |
2387 | } else | |
55138e0b TT |
2388 | desired_nr_to_write = ext4_num_dirty_pages(inode, index, |
2389 | max_pages); | |
2390 | if (desired_nr_to_write > max_pages) | |
2391 | desired_nr_to_write = max_pages; | |
2392 | ||
2393 | if (wbc->nr_to_write < desired_nr_to_write) { | |
2394 | nr_to_writebump = desired_nr_to_write - wbc->nr_to_write; | |
2395 | wbc->nr_to_write = desired_nr_to_write; | |
2396 | } | |
2397 | ||
2acf2c26 | 2398 | retry: |
6e6938b6 | 2399 | if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) |
5b41d924 ES |
2400 | tag_pages_for_writeback(mapping, index, end); |
2401 | ||
1bce63d1 | 2402 | blk_start_plug(&plug); |
22208ded | 2403 | while (!ret && wbc->nr_to_write > 0) { |
a1d6cc56 AK |
2404 | |
2405 | /* | |
2406 | * we insert one extent at a time. So we need | |
2407 | * credit needed for single extent allocation. | |
2408 | * journalled mode is currently not supported | |
2409 | * by delalloc | |
2410 | */ | |
2411 | BUG_ON(ext4_should_journal_data(inode)); | |
525f4ed8 | 2412 | needed_blocks = ext4_da_writepages_trans_blocks(inode); |
a1d6cc56 | 2413 | |
61628a3f | 2414 | /* start a new transaction*/ |
9924a92a TT |
2415 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, |
2416 | needed_blocks); | |
61628a3f MC |
2417 | if (IS_ERR(handle)) { |
2418 | ret = PTR_ERR(handle); | |
1693918e | 2419 | ext4_msg(inode->i_sb, KERN_CRIT, "%s: jbd2_start: " |
fbe845dd | 2420 | "%ld pages, ino %lu; err %d", __func__, |
a1d6cc56 | 2421 | wbc->nr_to_write, inode->i_ino, ret); |
3c1fcb2c | 2422 | blk_finish_plug(&plug); |
61628a3f MC |
2423 | goto out_writepages; |
2424 | } | |
f63e6005 TT |
2425 | |
2426 | /* | |
8eb9e5ce | 2427 | * Now call write_cache_pages_da() to find the next |
f63e6005 | 2428 | * contiguous region of logical blocks that need |
8eb9e5ce | 2429 | * blocks to be allocated by ext4 and submit them. |
f63e6005 | 2430 | */ |
9c3569b5 TM |
2431 | ret = write_cache_pages_da(handle, mapping, |
2432 | wbc, &mpd, &done_index); | |
f63e6005 | 2433 | /* |
af901ca1 | 2434 | * If we have a contiguous extent of pages and we |
f63e6005 TT |
2435 | * haven't done the I/O yet, map the blocks and submit |
2436 | * them for I/O. | |
2437 | */ | |
2438 | if (!mpd.io_done && mpd.next_page != mpd.first_page) { | |
5a87b7a5 | 2439 | mpage_da_map_and_submit(&mpd); |
f63e6005 TT |
2440 | ret = MPAGE_DA_EXTENT_TAIL; |
2441 | } | |
b3a3ca8c | 2442 | trace_ext4_da_write_pages(inode, &mpd); |
f63e6005 | 2443 | wbc->nr_to_write -= mpd.pages_written; |
df22291f | 2444 | |
61628a3f | 2445 | ext4_journal_stop(handle); |
df22291f | 2446 | |
8f64b32e | 2447 | if ((mpd.retval == -ENOSPC) && sbi->s_journal) { |
22208ded AK |
2448 | /* commit the transaction which would |
2449 | * free blocks released in the transaction | |
2450 | * and try again | |
2451 | */ | |
df22291f | 2452 | jbd2_journal_force_commit_nested(sbi->s_journal); |
22208ded AK |
2453 | ret = 0; |
2454 | } else if (ret == MPAGE_DA_EXTENT_TAIL) { | |
a1d6cc56 | 2455 | /* |
8de49e67 KM |
2456 | * Got one extent now try with rest of the pages. |
2457 | * If mpd.retval is set -EIO, journal is aborted. | |
2458 | * So we don't need to write any more. | |
a1d6cc56 | 2459 | */ |
22208ded | 2460 | pages_written += mpd.pages_written; |
8de49e67 | 2461 | ret = mpd.retval; |
2acf2c26 | 2462 | io_done = 1; |
22208ded | 2463 | } else if (wbc->nr_to_write) |
61628a3f MC |
2464 | /* |
2465 | * There is no more writeout needed | |
2466 | * or we requested for a noblocking writeout | |
2467 | * and we found the device congested | |
2468 | */ | |
61628a3f | 2469 | break; |
a1d6cc56 | 2470 | } |
1bce63d1 | 2471 | blk_finish_plug(&plug); |
2acf2c26 AK |
2472 | if (!io_done && !cycled) { |
2473 | cycled = 1; | |
2474 | index = 0; | |
2475 | wbc->range_start = index << PAGE_CACHE_SHIFT; | |
2476 | wbc->range_end = mapping->writeback_index - 1; | |
2477 | goto retry; | |
2478 | } | |
22208ded AK |
2479 | |
2480 | /* Update index */ | |
2acf2c26 | 2481 | wbc->range_cyclic = range_cyclic; |
22208ded AK |
2482 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
2483 | /* | |
2484 | * set the writeback_index so that range_cyclic | |
2485 | * mode will write it back later | |
2486 | */ | |
72f84e65 | 2487 | mapping->writeback_index = done_index; |
a1d6cc56 | 2488 | |
61628a3f | 2489 | out_writepages: |
2faf2e19 | 2490 | wbc->nr_to_write -= nr_to_writebump; |
de89de6e | 2491 | wbc->range_start = range_start; |
9bffad1e | 2492 | trace_ext4_da_writepages_result(inode, wbc, ret, pages_written); |
61628a3f | 2493 | return ret; |
64769240 AT |
2494 | } |
2495 | ||
79f0be8d AK |
2496 | static int ext4_nonda_switch(struct super_block *sb) |
2497 | { | |
2498 | s64 free_blocks, dirty_blocks; | |
2499 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
2500 | ||
2501 | /* | |
2502 | * switch to non delalloc mode if we are running low | |
2503 | * on free block. The free block accounting via percpu | |
179f7ebf | 2504 | * counters can get slightly wrong with percpu_counter_batch getting |
79f0be8d AK |
2505 | * accumulated on each CPU without updating global counters |
2506 | * Delalloc need an accurate free block accounting. So switch | |
2507 | * to non delalloc when we are near to error range. | |
2508 | */ | |
57042651 TT |
2509 | free_blocks = EXT4_C2B(sbi, |
2510 | percpu_counter_read_positive(&sbi->s_freeclusters_counter)); | |
2511 | dirty_blocks = percpu_counter_read_positive(&sbi->s_dirtyclusters_counter); | |
00d4e736 TT |
2512 | /* |
2513 | * Start pushing delalloc when 1/2 of free blocks are dirty. | |
2514 | */ | |
10ee27a0 MX |
2515 | if (dirty_blocks && (free_blocks < 2 * dirty_blocks)) |
2516 | try_to_writeback_inodes_sb(sb, WB_REASON_FS_FREE_SPACE); | |
00d4e736 | 2517 | |
79f0be8d | 2518 | if (2 * free_blocks < 3 * dirty_blocks || |
df55c99d | 2519 | free_blocks < (dirty_blocks + EXT4_FREECLUSTERS_WATERMARK)) { |
79f0be8d | 2520 | /* |
c8afb446 ES |
2521 | * free block count is less than 150% of dirty blocks |
2522 | * or free blocks is less than watermark | |
79f0be8d AK |
2523 | */ |
2524 | return 1; | |
2525 | } | |
2526 | return 0; | |
2527 | } | |
2528 | ||
64769240 | 2529 | static int ext4_da_write_begin(struct file *file, struct address_space *mapping, |
de9a55b8 TT |
2530 | loff_t pos, unsigned len, unsigned flags, |
2531 | struct page **pagep, void **fsdata) | |
64769240 | 2532 | { |
72b8ab9d | 2533 | int ret, retries = 0; |
64769240 AT |
2534 | struct page *page; |
2535 | pgoff_t index; | |
64769240 AT |
2536 | struct inode *inode = mapping->host; |
2537 | handle_t *handle; | |
2538 | ||
2539 | index = pos >> PAGE_CACHE_SHIFT; | |
79f0be8d AK |
2540 | |
2541 | if (ext4_nonda_switch(inode->i_sb)) { | |
2542 | *fsdata = (void *)FALL_BACK_TO_NONDELALLOC; | |
2543 | return ext4_write_begin(file, mapping, pos, | |
2544 | len, flags, pagep, fsdata); | |
2545 | } | |
2546 | *fsdata = (void *)0; | |
9bffad1e | 2547 | trace_ext4_da_write_begin(inode, pos, len, flags); |
9c3569b5 TM |
2548 | |
2549 | if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) { | |
2550 | ret = ext4_da_write_inline_data_begin(mapping, inode, | |
2551 | pos, len, flags, | |
2552 | pagep, fsdata); | |
2553 | if (ret < 0) | |
47564bfb TT |
2554 | return ret; |
2555 | if (ret == 1) | |
2556 | return 0; | |
9c3569b5 TM |
2557 | } |
2558 | ||
47564bfb TT |
2559 | /* |
2560 | * grab_cache_page_write_begin() can take a long time if the | |
2561 | * system is thrashing due to memory pressure, or if the page | |
2562 | * is being written back. So grab it first before we start | |
2563 | * the transaction handle. This also allows us to allocate | |
2564 | * the page (if needed) without using GFP_NOFS. | |
2565 | */ | |
2566 | retry_grab: | |
2567 | page = grab_cache_page_write_begin(mapping, index, flags); | |
2568 | if (!page) | |
2569 | return -ENOMEM; | |
2570 | unlock_page(page); | |
2571 | ||
64769240 AT |
2572 | /* |
2573 | * With delayed allocation, we don't log the i_disksize update | |
2574 | * if there is delayed block allocation. But we still need | |
2575 | * to journalling the i_disksize update if writes to the end | |
2576 | * of file which has an already mapped buffer. | |
2577 | */ | |
47564bfb | 2578 | retry_journal: |
9924a92a | 2579 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, 1); |
64769240 | 2580 | if (IS_ERR(handle)) { |
47564bfb TT |
2581 | page_cache_release(page); |
2582 | return PTR_ERR(handle); | |
64769240 AT |
2583 | } |
2584 | ||
47564bfb TT |
2585 | lock_page(page); |
2586 | if (page->mapping != mapping) { | |
2587 | /* The page got truncated from under us */ | |
2588 | unlock_page(page); | |
2589 | page_cache_release(page); | |
d5a0d4f7 | 2590 | ext4_journal_stop(handle); |
47564bfb | 2591 | goto retry_grab; |
d5a0d4f7 | 2592 | } |
47564bfb TT |
2593 | /* In case writeback began while the page was unlocked */ |
2594 | wait_on_page_writeback(page); | |
64769240 | 2595 | |
6e1db88d | 2596 | ret = __block_write_begin(page, pos, len, ext4_da_get_block_prep); |
64769240 AT |
2597 | if (ret < 0) { |
2598 | unlock_page(page); | |
2599 | ext4_journal_stop(handle); | |
ae4d5372 AK |
2600 | /* |
2601 | * block_write_begin may have instantiated a few blocks | |
2602 | * outside i_size. Trim these off again. Don't need | |
2603 | * i_size_read because we hold i_mutex. | |
2604 | */ | |
2605 | if (pos + len > inode->i_size) | |
b9a4207d | 2606 | ext4_truncate_failed_write(inode); |
47564bfb TT |
2607 | |
2608 | if (ret == -ENOSPC && | |
2609 | ext4_should_retry_alloc(inode->i_sb, &retries)) | |
2610 | goto retry_journal; | |
2611 | ||
2612 | page_cache_release(page); | |
2613 | return ret; | |
64769240 AT |
2614 | } |
2615 | ||
47564bfb | 2616 | *pagep = page; |
64769240 AT |
2617 | return ret; |
2618 | } | |
2619 | ||
632eaeab MC |
2620 | /* |
2621 | * Check if we should update i_disksize | |
2622 | * when write to the end of file but not require block allocation | |
2623 | */ | |
2624 | static int ext4_da_should_update_i_disksize(struct page *page, | |
de9a55b8 | 2625 | unsigned long offset) |
632eaeab MC |
2626 | { |
2627 | struct buffer_head *bh; | |
2628 | struct inode *inode = page->mapping->host; | |
2629 | unsigned int idx; | |
2630 | int i; | |
2631 | ||
2632 | bh = page_buffers(page); | |
2633 | idx = offset >> inode->i_blkbits; | |
2634 | ||
af5bc92d | 2635 | for (i = 0; i < idx; i++) |
632eaeab MC |
2636 | bh = bh->b_this_page; |
2637 | ||
29fa89d0 | 2638 | if (!buffer_mapped(bh) || (buffer_delay(bh)) || buffer_unwritten(bh)) |
632eaeab MC |
2639 | return 0; |
2640 | return 1; | |
2641 | } | |
2642 | ||
64769240 | 2643 | static int ext4_da_write_end(struct file *file, |
de9a55b8 TT |
2644 | struct address_space *mapping, |
2645 | loff_t pos, unsigned len, unsigned copied, | |
2646 | struct page *page, void *fsdata) | |
64769240 AT |
2647 | { |
2648 | struct inode *inode = mapping->host; | |
2649 | int ret = 0, ret2; | |
2650 | handle_t *handle = ext4_journal_current_handle(); | |
2651 | loff_t new_i_size; | |
632eaeab | 2652 | unsigned long start, end; |
79f0be8d AK |
2653 | int write_mode = (int)(unsigned long)fsdata; |
2654 | ||
2655 | if (write_mode == FALL_BACK_TO_NONDELALLOC) { | |
3d2b1582 LC |
2656 | switch (ext4_inode_journal_mode(inode)) { |
2657 | case EXT4_INODE_ORDERED_DATA_MODE: | |
79f0be8d AK |
2658 | return ext4_ordered_write_end(file, mapping, pos, |
2659 | len, copied, page, fsdata); | |
3d2b1582 | 2660 | case EXT4_INODE_WRITEBACK_DATA_MODE: |
79f0be8d AK |
2661 | return ext4_writeback_write_end(file, mapping, pos, |
2662 | len, copied, page, fsdata); | |
3d2b1582 | 2663 | default: |
79f0be8d AK |
2664 | BUG(); |
2665 | } | |
2666 | } | |
632eaeab | 2667 | |
9bffad1e | 2668 | trace_ext4_da_write_end(inode, pos, len, copied); |
632eaeab | 2669 | start = pos & (PAGE_CACHE_SIZE - 1); |
af5bc92d | 2670 | end = start + copied - 1; |
64769240 AT |
2671 | |
2672 | /* | |
2673 | * generic_write_end() will run mark_inode_dirty() if i_size | |
2674 | * changes. So let's piggyback the i_disksize mark_inode_dirty | |
2675 | * into that. | |
2676 | */ | |
64769240 | 2677 | new_i_size = pos + copied; |
ea51d132 | 2678 | if (copied && new_i_size > EXT4_I(inode)->i_disksize) { |
9c3569b5 TM |
2679 | if (ext4_has_inline_data(inode) || |
2680 | ext4_da_should_update_i_disksize(page, end)) { | |
632eaeab | 2681 | down_write(&EXT4_I(inode)->i_data_sem); |
f3b59291 | 2682 | if (new_i_size > EXT4_I(inode)->i_disksize) |
632eaeab | 2683 | EXT4_I(inode)->i_disksize = new_i_size; |
632eaeab | 2684 | up_write(&EXT4_I(inode)->i_data_sem); |
cf17fea6 AK |
2685 | /* We need to mark inode dirty even if |
2686 | * new_i_size is less that inode->i_size | |
2687 | * bu greater than i_disksize.(hint delalloc) | |
2688 | */ | |
2689 | ext4_mark_inode_dirty(handle, inode); | |
64769240 | 2690 | } |
632eaeab | 2691 | } |
9c3569b5 TM |
2692 | |
2693 | if (write_mode != CONVERT_INLINE_DATA && | |
2694 | ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA) && | |
2695 | ext4_has_inline_data(inode)) | |
2696 | ret2 = ext4_da_write_inline_data_end(inode, pos, len, copied, | |
2697 | page); | |
2698 | else | |
2699 | ret2 = generic_write_end(file, mapping, pos, len, copied, | |
64769240 | 2700 | page, fsdata); |
9c3569b5 | 2701 | |
64769240 AT |
2702 | copied = ret2; |
2703 | if (ret2 < 0) | |
2704 | ret = ret2; | |
2705 | ret2 = ext4_journal_stop(handle); | |
2706 | if (!ret) | |
2707 | ret = ret2; | |
2708 | ||
2709 | return ret ? ret : copied; | |
2710 | } | |
2711 | ||
2712 | static void ext4_da_invalidatepage(struct page *page, unsigned long offset) | |
2713 | { | |
64769240 AT |
2714 | /* |
2715 | * Drop reserved blocks | |
2716 | */ | |
2717 | BUG_ON(!PageLocked(page)); | |
2718 | if (!page_has_buffers(page)) | |
2719 | goto out; | |
2720 | ||
d2a17637 | 2721 | ext4_da_page_release_reservation(page, offset); |
64769240 AT |
2722 | |
2723 | out: | |
2724 | ext4_invalidatepage(page, offset); | |
2725 | ||
2726 | return; | |
2727 | } | |
2728 | ||
ccd2506b TT |
2729 | /* |
2730 | * Force all delayed allocation blocks to be allocated for a given inode. | |
2731 | */ | |
2732 | int ext4_alloc_da_blocks(struct inode *inode) | |
2733 | { | |
fb40ba0d TT |
2734 | trace_ext4_alloc_da_blocks(inode); |
2735 | ||
ccd2506b TT |
2736 | if (!EXT4_I(inode)->i_reserved_data_blocks && |
2737 | !EXT4_I(inode)->i_reserved_meta_blocks) | |
2738 | return 0; | |
2739 | ||
2740 | /* | |
2741 | * We do something simple for now. The filemap_flush() will | |
2742 | * also start triggering a write of the data blocks, which is | |
2743 | * not strictly speaking necessary (and for users of | |
2744 | * laptop_mode, not even desirable). However, to do otherwise | |
2745 | * would require replicating code paths in: | |
de9a55b8 | 2746 | * |
ccd2506b TT |
2747 | * ext4_da_writepages() -> |
2748 | * write_cache_pages() ---> (via passed in callback function) | |
2749 | * __mpage_da_writepage() --> | |
2750 | * mpage_add_bh_to_extent() | |
2751 | * mpage_da_map_blocks() | |
2752 | * | |
2753 | * The problem is that write_cache_pages(), located in | |
2754 | * mm/page-writeback.c, marks pages clean in preparation for | |
2755 | * doing I/O, which is not desirable if we're not planning on | |
2756 | * doing I/O at all. | |
2757 | * | |
2758 | * We could call write_cache_pages(), and then redirty all of | |
380cf090 | 2759 | * the pages by calling redirty_page_for_writepage() but that |
ccd2506b TT |
2760 | * would be ugly in the extreme. So instead we would need to |
2761 | * replicate parts of the code in the above functions, | |
25985edc | 2762 | * simplifying them because we wouldn't actually intend to |
ccd2506b TT |
2763 | * write out the pages, but rather only collect contiguous |
2764 | * logical block extents, call the multi-block allocator, and | |
2765 | * then update the buffer heads with the block allocations. | |
de9a55b8 | 2766 | * |
ccd2506b TT |
2767 | * For now, though, we'll cheat by calling filemap_flush(), |
2768 | * which will map the blocks, and start the I/O, but not | |
2769 | * actually wait for the I/O to complete. | |
2770 | */ | |
2771 | return filemap_flush(inode->i_mapping); | |
2772 | } | |
64769240 | 2773 | |
ac27a0ec DK |
2774 | /* |
2775 | * bmap() is special. It gets used by applications such as lilo and by | |
2776 | * the swapper to find the on-disk block of a specific piece of data. | |
2777 | * | |
2778 | * Naturally, this is dangerous if the block concerned is still in the | |
617ba13b | 2779 | * journal. If somebody makes a swapfile on an ext4 data-journaling |
ac27a0ec DK |
2780 | * filesystem and enables swap, then they may get a nasty shock when the |
2781 | * data getting swapped to that swapfile suddenly gets overwritten by | |
2782 | * the original zero's written out previously to the journal and | |
2783 | * awaiting writeback in the kernel's buffer cache. | |
2784 | * | |
2785 | * So, if we see any bmap calls here on a modified, data-journaled file, | |
2786 | * take extra steps to flush any blocks which might be in the cache. | |
2787 | */ | |
617ba13b | 2788 | static sector_t ext4_bmap(struct address_space *mapping, sector_t block) |
ac27a0ec DK |
2789 | { |
2790 | struct inode *inode = mapping->host; | |
2791 | journal_t *journal; | |
2792 | int err; | |
2793 | ||
46c7f254 TM |
2794 | /* |
2795 | * We can get here for an inline file via the FIBMAP ioctl | |
2796 | */ | |
2797 | if (ext4_has_inline_data(inode)) | |
2798 | return 0; | |
2799 | ||
64769240 AT |
2800 | if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY) && |
2801 | test_opt(inode->i_sb, DELALLOC)) { | |
2802 | /* | |
2803 | * With delalloc we want to sync the file | |
2804 | * so that we can make sure we allocate | |
2805 | * blocks for file | |
2806 | */ | |
2807 | filemap_write_and_wait(mapping); | |
2808 | } | |
2809 | ||
19f5fb7a TT |
2810 | if (EXT4_JOURNAL(inode) && |
2811 | ext4_test_inode_state(inode, EXT4_STATE_JDATA)) { | |
ac27a0ec DK |
2812 | /* |
2813 | * This is a REALLY heavyweight approach, but the use of | |
2814 | * bmap on dirty files is expected to be extremely rare: | |
2815 | * only if we run lilo or swapon on a freshly made file | |
2816 | * do we expect this to happen. | |
2817 | * | |
2818 | * (bmap requires CAP_SYS_RAWIO so this does not | |
2819 | * represent an unprivileged user DOS attack --- we'd be | |
2820 | * in trouble if mortal users could trigger this path at | |
2821 | * will.) | |
2822 | * | |
617ba13b | 2823 | * NB. EXT4_STATE_JDATA is not set on files other than |
ac27a0ec DK |
2824 | * regular files. If somebody wants to bmap a directory |
2825 | * or symlink and gets confused because the buffer | |
2826 | * hasn't yet been flushed to disk, they deserve | |
2827 | * everything they get. | |
2828 | */ | |
2829 | ||
19f5fb7a | 2830 | ext4_clear_inode_state(inode, EXT4_STATE_JDATA); |
617ba13b | 2831 | journal = EXT4_JOURNAL(inode); |
dab291af MC |
2832 | jbd2_journal_lock_updates(journal); |
2833 | err = jbd2_journal_flush(journal); | |
2834 | jbd2_journal_unlock_updates(journal); | |
ac27a0ec DK |
2835 | |
2836 | if (err) | |
2837 | return 0; | |
2838 | } | |
2839 | ||
af5bc92d | 2840 | return generic_block_bmap(mapping, block, ext4_get_block); |
ac27a0ec DK |
2841 | } |
2842 | ||
617ba13b | 2843 | static int ext4_readpage(struct file *file, struct page *page) |
ac27a0ec | 2844 | { |
46c7f254 TM |
2845 | int ret = -EAGAIN; |
2846 | struct inode *inode = page->mapping->host; | |
2847 | ||
0562e0ba | 2848 | trace_ext4_readpage(page); |
46c7f254 TM |
2849 | |
2850 | if (ext4_has_inline_data(inode)) | |
2851 | ret = ext4_readpage_inline(inode, page); | |
2852 | ||
2853 | if (ret == -EAGAIN) | |
2854 | return mpage_readpage(page, ext4_get_block); | |
2855 | ||
2856 | return ret; | |
ac27a0ec DK |
2857 | } |
2858 | ||
2859 | static int | |
617ba13b | 2860 | ext4_readpages(struct file *file, struct address_space *mapping, |
ac27a0ec DK |
2861 | struct list_head *pages, unsigned nr_pages) |
2862 | { | |
46c7f254 TM |
2863 | struct inode *inode = mapping->host; |
2864 | ||
2865 | /* If the file has inline data, no need to do readpages. */ | |
2866 | if (ext4_has_inline_data(inode)) | |
2867 | return 0; | |
2868 | ||
617ba13b | 2869 | return mpage_readpages(mapping, pages, nr_pages, ext4_get_block); |
ac27a0ec DK |
2870 | } |
2871 | ||
617ba13b | 2872 | static void ext4_invalidatepage(struct page *page, unsigned long offset) |
ac27a0ec | 2873 | { |
0562e0ba JZ |
2874 | trace_ext4_invalidatepage(page, offset); |
2875 | ||
4520fb3c JK |
2876 | /* No journalling happens on data buffers when this function is used */ |
2877 | WARN_ON(page_has_buffers(page) && buffer_jbd(page_buffers(page))); | |
2878 | ||
2879 | block_invalidatepage(page, offset); | |
2880 | } | |
2881 | ||
53e87268 JK |
2882 | static int __ext4_journalled_invalidatepage(struct page *page, |
2883 | unsigned long offset) | |
4520fb3c JK |
2884 | { |
2885 | journal_t *journal = EXT4_JOURNAL(page->mapping->host); | |
2886 | ||
2887 | trace_ext4_journalled_invalidatepage(page, offset); | |
2888 | ||
ac27a0ec DK |
2889 | /* |
2890 | * If it's a full truncate we just forget about the pending dirtying | |
2891 | */ | |
2892 | if (offset == 0) | |
2893 | ClearPageChecked(page); | |
2894 | ||
53e87268 JK |
2895 | return jbd2_journal_invalidatepage(journal, page, offset); |
2896 | } | |
2897 | ||
2898 | /* Wrapper for aops... */ | |
2899 | static void ext4_journalled_invalidatepage(struct page *page, | |
2900 | unsigned long offset) | |
2901 | { | |
2902 | WARN_ON(__ext4_journalled_invalidatepage(page, offset) < 0); | |
ac27a0ec DK |
2903 | } |
2904 | ||
617ba13b | 2905 | static int ext4_releasepage(struct page *page, gfp_t wait) |
ac27a0ec | 2906 | { |
617ba13b | 2907 | journal_t *journal = EXT4_JOURNAL(page->mapping->host); |
ac27a0ec | 2908 | |
0562e0ba JZ |
2909 | trace_ext4_releasepage(page); |
2910 | ||
ac27a0ec DK |
2911 | WARN_ON(PageChecked(page)); |
2912 | if (!page_has_buffers(page)) | |
2913 | return 0; | |
0390131b FM |
2914 | if (journal) |
2915 | return jbd2_journal_try_to_free_buffers(journal, page, wait); | |
2916 | else | |
2917 | return try_to_free_buffers(page); | |
ac27a0ec DK |
2918 | } |
2919 | ||
2ed88685 TT |
2920 | /* |
2921 | * ext4_get_block used when preparing for a DIO write or buffer write. | |
2922 | * We allocate an uinitialized extent if blocks haven't been allocated. | |
2923 | * The extent will be converted to initialized after the IO is complete. | |
2924 | */ | |
f19d5870 | 2925 | int ext4_get_block_write(struct inode *inode, sector_t iblock, |
4c0425ff MC |
2926 | struct buffer_head *bh_result, int create) |
2927 | { | |
c7064ef1 | 2928 | ext4_debug("ext4_get_block_write: inode %lu, create flag %d\n", |
8d5d02e6 | 2929 | inode->i_ino, create); |
2ed88685 TT |
2930 | return _ext4_get_block(inode, iblock, bh_result, |
2931 | EXT4_GET_BLOCKS_IO_CREATE_EXT); | |
4c0425ff MC |
2932 | } |
2933 | ||
729f52c6 | 2934 | static int ext4_get_block_write_nolock(struct inode *inode, sector_t iblock, |
8b0f165f | 2935 | struct buffer_head *bh_result, int create) |
729f52c6 | 2936 | { |
8b0f165f AP |
2937 | ext4_debug("ext4_get_block_write_nolock: inode %lu, create flag %d\n", |
2938 | inode->i_ino, create); | |
2939 | return _ext4_get_block(inode, iblock, bh_result, | |
2940 | EXT4_GET_BLOCKS_NO_LOCK); | |
729f52c6 ZL |
2941 | } |
2942 | ||
4c0425ff | 2943 | static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset, |
552ef802 CH |
2944 | ssize_t size, void *private, int ret, |
2945 | bool is_async) | |
4c0425ff | 2946 | { |
496ad9aa | 2947 | struct inode *inode = file_inode(iocb->ki_filp); |
4c0425ff | 2948 | ext4_io_end_t *io_end = iocb->private; |
4c0425ff | 2949 | |
4b70df18 M |
2950 | /* if not async direct IO or dio with 0 bytes write, just return */ |
2951 | if (!io_end || !size) | |
552ef802 | 2952 | goto out; |
4b70df18 | 2953 | |
88635ca2 | 2954 | ext_debug("ext4_end_io_dio(): io_end 0x%p " |
ace36ad4 | 2955 | "for inode %lu, iocb 0x%p, offset %llu, size %zd\n", |
8d5d02e6 MC |
2956 | iocb->private, io_end->inode->i_ino, iocb, offset, |
2957 | size); | |
8d5d02e6 | 2958 | |
b5a7e970 TT |
2959 | iocb->private = NULL; |
2960 | ||
8d5d02e6 | 2961 | /* if not aio dio with unwritten extents, just free io and return */ |
bd2d0210 | 2962 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { |
8d5d02e6 | 2963 | ext4_free_io_end(io_end); |
5b3ff237 | 2964 | out: |
091e26df | 2965 | inode_dio_done(inode); |
5b3ff237 JZ |
2966 | if (is_async) |
2967 | aio_complete(iocb, ret, 0); | |
2968 | return; | |
8d5d02e6 MC |
2969 | } |
2970 | ||
4c0425ff MC |
2971 | io_end->offset = offset; |
2972 | io_end->size = size; | |
5b3ff237 JZ |
2973 | if (is_async) { |
2974 | io_end->iocb = iocb; | |
2975 | io_end->result = ret; | |
2976 | } | |
4c0425ff | 2977 | |
28a535f9 | 2978 | ext4_add_complete_io(io_end); |
4c0425ff | 2979 | } |
c7064ef1 | 2980 | |
4c0425ff MC |
2981 | /* |
2982 | * For ext4 extent files, ext4 will do direct-io write to holes, | |
2983 | * preallocated extents, and those write extend the file, no need to | |
2984 | * fall back to buffered IO. | |
2985 | * | |
b595076a | 2986 | * For holes, we fallocate those blocks, mark them as uninitialized |
69c499d1 | 2987 | * If those blocks were preallocated, we mark sure they are split, but |
b595076a | 2988 | * still keep the range to write as uninitialized. |
4c0425ff | 2989 | * |
69c499d1 | 2990 | * The unwritten extents will be converted to written when DIO is completed. |
8d5d02e6 | 2991 | * For async direct IO, since the IO may still pending when return, we |
25985edc | 2992 | * set up an end_io call back function, which will do the conversion |
8d5d02e6 | 2993 | * when async direct IO completed. |
4c0425ff MC |
2994 | * |
2995 | * If the O_DIRECT write will extend the file then add this inode to the | |
2996 | * orphan list. So recovery will truncate it back to the original size | |
2997 | * if the machine crashes during the write. | |
2998 | * | |
2999 | */ | |
3000 | static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb, | |
3001 | const struct iovec *iov, loff_t offset, | |
3002 | unsigned long nr_segs) | |
3003 | { | |
3004 | struct file *file = iocb->ki_filp; | |
3005 | struct inode *inode = file->f_mapping->host; | |
3006 | ssize_t ret; | |
3007 | size_t count = iov_length(iov, nr_segs); | |
69c499d1 TT |
3008 | int overwrite = 0; |
3009 | get_block_t *get_block_func = NULL; | |
3010 | int dio_flags = 0; | |
4c0425ff | 3011 | loff_t final_size = offset + count; |
729f52c6 | 3012 | |
69c499d1 TT |
3013 | /* Use the old path for reads and writes beyond i_size. */ |
3014 | if (rw != WRITE || final_size > inode->i_size) | |
3015 | return ext4_ind_direct_IO(rw, iocb, iov, offset, nr_segs); | |
4bd809db | 3016 | |
69c499d1 | 3017 | BUG_ON(iocb->private == NULL); |
4bd809db | 3018 | |
69c499d1 TT |
3019 | /* If we do a overwrite dio, i_mutex locking can be released */ |
3020 | overwrite = *((int *)iocb->private); | |
4bd809db | 3021 | |
69c499d1 TT |
3022 | if (overwrite) { |
3023 | atomic_inc(&inode->i_dio_count); | |
3024 | down_read(&EXT4_I(inode)->i_data_sem); | |
3025 | mutex_unlock(&inode->i_mutex); | |
3026 | } | |
8d5d02e6 | 3027 | |
69c499d1 TT |
3028 | /* |
3029 | * We could direct write to holes and fallocate. | |
3030 | * | |
3031 | * Allocated blocks to fill the hole are marked as | |
3032 | * uninitialized to prevent parallel buffered read to expose | |
3033 | * the stale data before DIO complete the data IO. | |
3034 | * | |
3035 | * As to previously fallocated extents, ext4 get_block will | |
3036 | * just simply mark the buffer mapped but still keep the | |
3037 | * extents uninitialized. | |
3038 | * | |
3039 | * For non AIO case, we will convert those unwritten extents | |
3040 | * to written after return back from blockdev_direct_IO. | |
3041 | * | |
3042 | * For async DIO, the conversion needs to be deferred when the | |
3043 | * IO is completed. The ext4 end_io callback function will be | |
3044 | * called to take care of the conversion work. Here for async | |
3045 | * case, we allocate an io_end structure to hook to the iocb. | |
3046 | */ | |
3047 | iocb->private = NULL; | |
3048 | ext4_inode_aio_set(inode, NULL); | |
3049 | if (!is_sync_kiocb(iocb)) { | |
3050 | ext4_io_end_t *io_end = ext4_init_io_end(inode, GFP_NOFS); | |
3051 | if (!io_end) { | |
3052 | ret = -ENOMEM; | |
3053 | goto retake_lock; | |
8b0f165f | 3054 | } |
69c499d1 TT |
3055 | io_end->flag |= EXT4_IO_END_DIRECT; |
3056 | iocb->private = io_end; | |
8d5d02e6 | 3057 | /* |
69c499d1 TT |
3058 | * we save the io structure for current async direct |
3059 | * IO, so that later ext4_map_blocks() could flag the | |
3060 | * io structure whether there is a unwritten extents | |
3061 | * needs to be converted when IO is completed. | |
8d5d02e6 | 3062 | */ |
69c499d1 TT |
3063 | ext4_inode_aio_set(inode, io_end); |
3064 | } | |
4bd809db | 3065 | |
69c499d1 TT |
3066 | if (overwrite) { |
3067 | get_block_func = ext4_get_block_write_nolock; | |
3068 | } else { | |
3069 | get_block_func = ext4_get_block_write; | |
3070 | dio_flags = DIO_LOCKING; | |
3071 | } | |
3072 | ret = __blockdev_direct_IO(rw, iocb, inode, | |
3073 | inode->i_sb->s_bdev, iov, | |
3074 | offset, nr_segs, | |
3075 | get_block_func, | |
3076 | ext4_end_io_dio, | |
3077 | NULL, | |
3078 | dio_flags); | |
3079 | ||
3080 | if (iocb->private) | |
3081 | ext4_inode_aio_set(inode, NULL); | |
3082 | /* | |
3083 | * The io_end structure takes a reference to the inode, that | |
3084 | * structure needs to be destroyed and the reference to the | |
3085 | * inode need to be dropped, when IO is complete, even with 0 | |
3086 | * byte write, or failed. | |
3087 | * | |
3088 | * In the successful AIO DIO case, the io_end structure will | |
3089 | * be destroyed and the reference to the inode will be dropped | |
3090 | * after the end_io call back function is called. | |
3091 | * | |
3092 | * In the case there is 0 byte write, or error case, since VFS | |
3093 | * direct IO won't invoke the end_io call back function, we | |
3094 | * need to free the end_io structure here. | |
3095 | */ | |
3096 | if (ret != -EIOCBQUEUED && ret <= 0 && iocb->private) { | |
3097 | ext4_free_io_end(iocb->private); | |
3098 | iocb->private = NULL; | |
3099 | } else if (ret > 0 && !overwrite && ext4_test_inode_state(inode, | |
3100 | EXT4_STATE_DIO_UNWRITTEN)) { | |
3101 | int err; | |
3102 | /* | |
3103 | * for non AIO case, since the IO is already | |
3104 | * completed, we could do the conversion right here | |
3105 | */ | |
3106 | err = ext4_convert_unwritten_extents(inode, | |
3107 | offset, ret); | |
3108 | if (err < 0) | |
3109 | ret = err; | |
3110 | ext4_clear_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN); | |
3111 | } | |
4bd809db | 3112 | |
69c499d1 TT |
3113 | retake_lock: |
3114 | /* take i_mutex locking again if we do a ovewrite dio */ | |
3115 | if (overwrite) { | |
3116 | inode_dio_done(inode); | |
3117 | up_read(&EXT4_I(inode)->i_data_sem); | |
3118 | mutex_lock(&inode->i_mutex); | |
4c0425ff | 3119 | } |
8d5d02e6 | 3120 | |
69c499d1 | 3121 | return ret; |
4c0425ff MC |
3122 | } |
3123 | ||
3124 | static ssize_t ext4_direct_IO(int rw, struct kiocb *iocb, | |
3125 | const struct iovec *iov, loff_t offset, | |
3126 | unsigned long nr_segs) | |
3127 | { | |
3128 | struct file *file = iocb->ki_filp; | |
3129 | struct inode *inode = file->f_mapping->host; | |
0562e0ba | 3130 | ssize_t ret; |
4c0425ff | 3131 | |
84ebd795 TT |
3132 | /* |
3133 | * If we are doing data journalling we don't support O_DIRECT | |
3134 | */ | |
3135 | if (ext4_should_journal_data(inode)) | |
3136 | return 0; | |
3137 | ||
46c7f254 TM |
3138 | /* Let buffer I/O handle the inline data case. */ |
3139 | if (ext4_has_inline_data(inode)) | |
3140 | return 0; | |
3141 | ||
0562e0ba | 3142 | trace_ext4_direct_IO_enter(inode, offset, iov_length(iov, nr_segs), rw); |
12e9b892 | 3143 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
0562e0ba JZ |
3144 | ret = ext4_ext_direct_IO(rw, iocb, iov, offset, nr_segs); |
3145 | else | |
3146 | ret = ext4_ind_direct_IO(rw, iocb, iov, offset, nr_segs); | |
3147 | trace_ext4_direct_IO_exit(inode, offset, | |
3148 | iov_length(iov, nr_segs), rw, ret); | |
3149 | return ret; | |
4c0425ff MC |
3150 | } |
3151 | ||
ac27a0ec | 3152 | /* |
617ba13b | 3153 | * Pages can be marked dirty completely asynchronously from ext4's journalling |
ac27a0ec DK |
3154 | * activity. By filemap_sync_pte(), try_to_unmap_one(), etc. We cannot do |
3155 | * much here because ->set_page_dirty is called under VFS locks. The page is | |
3156 | * not necessarily locked. | |
3157 | * | |
3158 | * We cannot just dirty the page and leave attached buffers clean, because the | |
3159 | * buffers' dirty state is "definitive". We cannot just set the buffers dirty | |
3160 | * or jbddirty because all the journalling code will explode. | |
3161 | * | |
3162 | * So what we do is to mark the page "pending dirty" and next time writepage | |
3163 | * is called, propagate that into the buffers appropriately. | |
3164 | */ | |
617ba13b | 3165 | static int ext4_journalled_set_page_dirty(struct page *page) |
ac27a0ec DK |
3166 | { |
3167 | SetPageChecked(page); | |
3168 | return __set_page_dirty_nobuffers(page); | |
3169 | } | |
3170 | ||
617ba13b | 3171 | static const struct address_space_operations ext4_ordered_aops = { |
8ab22b9a HH |
3172 | .readpage = ext4_readpage, |
3173 | .readpages = ext4_readpages, | |
43ce1d23 | 3174 | .writepage = ext4_writepage, |
8ab22b9a HH |
3175 | .write_begin = ext4_write_begin, |
3176 | .write_end = ext4_ordered_write_end, | |
3177 | .bmap = ext4_bmap, | |
3178 | .invalidatepage = ext4_invalidatepage, | |
3179 | .releasepage = ext4_releasepage, | |
3180 | .direct_IO = ext4_direct_IO, | |
3181 | .migratepage = buffer_migrate_page, | |
3182 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 3183 | .error_remove_page = generic_error_remove_page, |
ac27a0ec DK |
3184 | }; |
3185 | ||
617ba13b | 3186 | static const struct address_space_operations ext4_writeback_aops = { |
8ab22b9a HH |
3187 | .readpage = ext4_readpage, |
3188 | .readpages = ext4_readpages, | |
43ce1d23 | 3189 | .writepage = ext4_writepage, |
8ab22b9a HH |
3190 | .write_begin = ext4_write_begin, |
3191 | .write_end = ext4_writeback_write_end, | |
3192 | .bmap = ext4_bmap, | |
3193 | .invalidatepage = ext4_invalidatepage, | |
3194 | .releasepage = ext4_releasepage, | |
3195 | .direct_IO = ext4_direct_IO, | |
3196 | .migratepage = buffer_migrate_page, | |
3197 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 3198 | .error_remove_page = generic_error_remove_page, |
ac27a0ec DK |
3199 | }; |
3200 | ||
617ba13b | 3201 | static const struct address_space_operations ext4_journalled_aops = { |
8ab22b9a HH |
3202 | .readpage = ext4_readpage, |
3203 | .readpages = ext4_readpages, | |
43ce1d23 | 3204 | .writepage = ext4_writepage, |
8ab22b9a HH |
3205 | .write_begin = ext4_write_begin, |
3206 | .write_end = ext4_journalled_write_end, | |
3207 | .set_page_dirty = ext4_journalled_set_page_dirty, | |
3208 | .bmap = ext4_bmap, | |
4520fb3c | 3209 | .invalidatepage = ext4_journalled_invalidatepage, |
8ab22b9a | 3210 | .releasepage = ext4_releasepage, |
84ebd795 | 3211 | .direct_IO = ext4_direct_IO, |
8ab22b9a | 3212 | .is_partially_uptodate = block_is_partially_uptodate, |
aa261f54 | 3213 | .error_remove_page = generic_error_remove_page, |
ac27a0ec DK |
3214 | }; |
3215 | ||
64769240 | 3216 | static const struct address_space_operations ext4_da_aops = { |
8ab22b9a HH |
3217 | .readpage = ext4_readpage, |
3218 | .readpages = ext4_readpages, | |
43ce1d23 | 3219 | .writepage = ext4_writepage, |
8ab22b9a | 3220 | .writepages = ext4_da_writepages, |
8ab22b9a HH |
3221 | .write_begin = ext4_da_write_begin, |
3222 | .write_end = ext4_da_write_end, | |
3223 | .bmap = ext4_bmap, | |
3224 | .invalidatepage = ext4_da_invalidatepage, | |
3225 | .releasepage = ext4_releasepage, | |
3226 | .direct_IO = ext4_direct_IO, | |
3227 | .migratepage = buffer_migrate_page, | |
3228 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 3229 | .error_remove_page = generic_error_remove_page, |
64769240 AT |
3230 | }; |
3231 | ||
617ba13b | 3232 | void ext4_set_aops(struct inode *inode) |
ac27a0ec | 3233 | { |
3d2b1582 LC |
3234 | switch (ext4_inode_journal_mode(inode)) { |
3235 | case EXT4_INODE_ORDERED_DATA_MODE: | |
3236 | if (test_opt(inode->i_sb, DELALLOC)) | |
3237 | inode->i_mapping->a_ops = &ext4_da_aops; | |
3238 | else | |
3239 | inode->i_mapping->a_ops = &ext4_ordered_aops; | |
3240 | break; | |
3241 | case EXT4_INODE_WRITEBACK_DATA_MODE: | |
3242 | if (test_opt(inode->i_sb, DELALLOC)) | |
3243 | inode->i_mapping->a_ops = &ext4_da_aops; | |
3244 | else | |
3245 | inode->i_mapping->a_ops = &ext4_writeback_aops; | |
3246 | break; | |
3247 | case EXT4_INODE_JOURNAL_DATA_MODE: | |
617ba13b | 3248 | inode->i_mapping->a_ops = &ext4_journalled_aops; |
3d2b1582 LC |
3249 | break; |
3250 | default: | |
3251 | BUG(); | |
3252 | } | |
ac27a0ec DK |
3253 | } |
3254 | ||
4e96b2db AH |
3255 | |
3256 | /* | |
3257 | * ext4_discard_partial_page_buffers() | |
3258 | * Wrapper function for ext4_discard_partial_page_buffers_no_lock. | |
3259 | * This function finds and locks the page containing the offset | |
3260 | * "from" and passes it to ext4_discard_partial_page_buffers_no_lock. | |
3261 | * Calling functions that already have the page locked should call | |
3262 | * ext4_discard_partial_page_buffers_no_lock directly. | |
3263 | */ | |
3264 | int ext4_discard_partial_page_buffers(handle_t *handle, | |
3265 | struct address_space *mapping, loff_t from, | |
3266 | loff_t length, int flags) | |
3267 | { | |
3268 | struct inode *inode = mapping->host; | |
3269 | struct page *page; | |
3270 | int err = 0; | |
3271 | ||
3272 | page = find_or_create_page(mapping, from >> PAGE_CACHE_SHIFT, | |
3273 | mapping_gfp_mask(mapping) & ~__GFP_FS); | |
3274 | if (!page) | |
5129d05f | 3275 | return -ENOMEM; |
4e96b2db AH |
3276 | |
3277 | err = ext4_discard_partial_page_buffers_no_lock(handle, inode, page, | |
3278 | from, length, flags); | |
3279 | ||
3280 | unlock_page(page); | |
3281 | page_cache_release(page); | |
3282 | return err; | |
3283 | } | |
3284 | ||
3285 | /* | |
3286 | * ext4_discard_partial_page_buffers_no_lock() | |
3287 | * Zeros a page range of length 'length' starting from offset 'from'. | |
3288 | * Buffer heads that correspond to the block aligned regions of the | |
3289 | * zeroed range will be unmapped. Unblock aligned regions | |
3290 | * will have the corresponding buffer head mapped if needed so that | |
3291 | * that region of the page can be updated with the partial zero out. | |
3292 | * | |
3293 | * This function assumes that the page has already been locked. The | |
3294 | * The range to be discarded must be contained with in the given page. | |
3295 | * If the specified range exceeds the end of the page it will be shortened | |
3296 | * to the end of the page that corresponds to 'from'. This function is | |
3297 | * appropriate for updating a page and it buffer heads to be unmapped and | |
3298 | * zeroed for blocks that have been either released, or are going to be | |
3299 | * released. | |
3300 | * | |
3301 | * handle: The journal handle | |
3302 | * inode: The files inode | |
3303 | * page: A locked page that contains the offset "from" | |
4907cb7b | 3304 | * from: The starting byte offset (from the beginning of the file) |
4e96b2db AH |
3305 | * to begin discarding |
3306 | * len: The length of bytes to discard | |
3307 | * flags: Optional flags that may be used: | |
3308 | * | |
3309 | * EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED | |
3310 | * Only zero the regions of the page whose buffer heads | |
3311 | * have already been unmapped. This flag is appropriate | |
4907cb7b | 3312 | * for updating the contents of a page whose blocks may |
4e96b2db AH |
3313 | * have already been released, and we only want to zero |
3314 | * out the regions that correspond to those released blocks. | |
3315 | * | |
4907cb7b | 3316 | * Returns zero on success or negative on failure. |
4e96b2db | 3317 | */ |
5f163cc7 | 3318 | static int ext4_discard_partial_page_buffers_no_lock(handle_t *handle, |
4e96b2db AH |
3319 | struct inode *inode, struct page *page, loff_t from, |
3320 | loff_t length, int flags) | |
3321 | { | |
3322 | ext4_fsblk_t index = from >> PAGE_CACHE_SHIFT; | |
3323 | unsigned int offset = from & (PAGE_CACHE_SIZE-1); | |
3324 | unsigned int blocksize, max, pos; | |
4e96b2db AH |
3325 | ext4_lblk_t iblock; |
3326 | struct buffer_head *bh; | |
3327 | int err = 0; | |
3328 | ||
3329 | blocksize = inode->i_sb->s_blocksize; | |
3330 | max = PAGE_CACHE_SIZE - offset; | |
3331 | ||
3332 | if (index != page->index) | |
3333 | return -EINVAL; | |
3334 | ||
3335 | /* | |
3336 | * correct length if it does not fall between | |
3337 | * 'from' and the end of the page | |
3338 | */ | |
3339 | if (length > max || length < 0) | |
3340 | length = max; | |
3341 | ||
3342 | iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); | |
3343 | ||
093e6e36 YY |
3344 | if (!page_has_buffers(page)) |
3345 | create_empty_buffers(page, blocksize, 0); | |
4e96b2db AH |
3346 | |
3347 | /* Find the buffer that contains "offset" */ | |
3348 | bh = page_buffers(page); | |
3349 | pos = blocksize; | |
3350 | while (offset >= pos) { | |
3351 | bh = bh->b_this_page; | |
3352 | iblock++; | |
3353 | pos += blocksize; | |
3354 | } | |
3355 | ||
3356 | pos = offset; | |
3357 | while (pos < offset + length) { | |
e260daf2 YY |
3358 | unsigned int end_of_block, range_to_discard; |
3359 | ||
4e96b2db AH |
3360 | err = 0; |
3361 | ||
3362 | /* The length of space left to zero and unmap */ | |
3363 | range_to_discard = offset + length - pos; | |
3364 | ||
3365 | /* The length of space until the end of the block */ | |
3366 | end_of_block = blocksize - (pos & (blocksize-1)); | |
3367 | ||
3368 | /* | |
3369 | * Do not unmap or zero past end of block | |
3370 | * for this buffer head | |
3371 | */ | |
3372 | if (range_to_discard > end_of_block) | |
3373 | range_to_discard = end_of_block; | |
3374 | ||
3375 | ||
3376 | /* | |
3377 | * Skip this buffer head if we are only zeroing unampped | |
3378 | * regions of the page | |
3379 | */ | |
3380 | if (flags & EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED && | |
3381 | buffer_mapped(bh)) | |
3382 | goto next; | |
3383 | ||
3384 | /* If the range is block aligned, unmap */ | |
3385 | if (range_to_discard == blocksize) { | |
3386 | clear_buffer_dirty(bh); | |
3387 | bh->b_bdev = NULL; | |
3388 | clear_buffer_mapped(bh); | |
3389 | clear_buffer_req(bh); | |
3390 | clear_buffer_new(bh); | |
3391 | clear_buffer_delay(bh); | |
3392 | clear_buffer_unwritten(bh); | |
3393 | clear_buffer_uptodate(bh); | |
3394 | zero_user(page, pos, range_to_discard); | |
3395 | BUFFER_TRACE(bh, "Buffer discarded"); | |
3396 | goto next; | |
3397 | } | |
3398 | ||
3399 | /* | |
3400 | * If this block is not completely contained in the range | |
3401 | * to be discarded, then it is not going to be released. Because | |
3402 | * we need to keep this block, we need to make sure this part | |
3403 | * of the page is uptodate before we modify it by writeing | |
3404 | * partial zeros on it. | |
3405 | */ | |
3406 | if (!buffer_mapped(bh)) { | |
3407 | /* | |
3408 | * Buffer head must be mapped before we can read | |
3409 | * from the block | |
3410 | */ | |
3411 | BUFFER_TRACE(bh, "unmapped"); | |
3412 | ext4_get_block(inode, iblock, bh, 0); | |
3413 | /* unmapped? It's a hole - nothing to do */ | |
3414 | if (!buffer_mapped(bh)) { | |
3415 | BUFFER_TRACE(bh, "still unmapped"); | |
3416 | goto next; | |
3417 | } | |
3418 | } | |
3419 | ||
3420 | /* Ok, it's mapped. Make sure it's up-to-date */ | |
3421 | if (PageUptodate(page)) | |
3422 | set_buffer_uptodate(bh); | |
3423 | ||
3424 | if (!buffer_uptodate(bh)) { | |
3425 | err = -EIO; | |
3426 | ll_rw_block(READ, 1, &bh); | |
3427 | wait_on_buffer(bh); | |
3428 | /* Uhhuh. Read error. Complain and punt.*/ | |
3429 | if (!buffer_uptodate(bh)) | |
3430 | goto next; | |
3431 | } | |
3432 | ||
3433 | if (ext4_should_journal_data(inode)) { | |
3434 | BUFFER_TRACE(bh, "get write access"); | |
3435 | err = ext4_journal_get_write_access(handle, bh); | |
3436 | if (err) | |
3437 | goto next; | |
3438 | } | |
3439 | ||
3440 | zero_user(page, pos, range_to_discard); | |
3441 | ||
3442 | err = 0; | |
3443 | if (ext4_should_journal_data(inode)) { | |
3444 | err = ext4_handle_dirty_metadata(handle, inode, bh); | |
decbd919 | 3445 | } else |
4e96b2db | 3446 | mark_buffer_dirty(bh); |
4e96b2db AH |
3447 | |
3448 | BUFFER_TRACE(bh, "Partial buffer zeroed"); | |
3449 | next: | |
3450 | bh = bh->b_this_page; | |
3451 | iblock++; | |
3452 | pos += range_to_discard; | |
3453 | } | |
3454 | ||
3455 | return err; | |
3456 | } | |
3457 | ||
91ef4caf DG |
3458 | int ext4_can_truncate(struct inode *inode) |
3459 | { | |
91ef4caf DG |
3460 | if (S_ISREG(inode->i_mode)) |
3461 | return 1; | |
3462 | if (S_ISDIR(inode->i_mode)) | |
3463 | return 1; | |
3464 | if (S_ISLNK(inode->i_mode)) | |
3465 | return !ext4_inode_is_fast_symlink(inode); | |
3466 | return 0; | |
3467 | } | |
3468 | ||
a4bb6b64 AH |
3469 | /* |
3470 | * ext4_punch_hole: punches a hole in a file by releaseing the blocks | |
3471 | * associated with the given offset and length | |
3472 | * | |
3473 | * @inode: File inode | |
3474 | * @offset: The offset where the hole will begin | |
3475 | * @len: The length of the hole | |
3476 | * | |
4907cb7b | 3477 | * Returns: 0 on success or negative on failure |
a4bb6b64 AH |
3478 | */ |
3479 | ||
3480 | int ext4_punch_hole(struct file *file, loff_t offset, loff_t length) | |
3481 | { | |
496ad9aa | 3482 | struct inode *inode = file_inode(file); |
a4bb6b64 | 3483 | if (!S_ISREG(inode->i_mode)) |
73355192 | 3484 | return -EOPNOTSUPP; |
a4bb6b64 | 3485 | |
8bad6fc8 ZL |
3486 | if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
3487 | return ext4_ind_punch_hole(file, offset, length); | |
a4bb6b64 | 3488 | |
bab08ab9 TT |
3489 | if (EXT4_SB(inode->i_sb)->s_cluster_ratio > 1) { |
3490 | /* TODO: Add support for bigalloc file systems */ | |
73355192 | 3491 | return -EOPNOTSUPP; |
bab08ab9 TT |
3492 | } |
3493 | ||
aaddea81 ZL |
3494 | trace_ext4_punch_hole(inode, offset, length); |
3495 | ||
a4bb6b64 AH |
3496 | return ext4_ext_punch_hole(file, offset, length); |
3497 | } | |
3498 | ||
ac27a0ec | 3499 | /* |
617ba13b | 3500 | * ext4_truncate() |
ac27a0ec | 3501 | * |
617ba13b MC |
3502 | * We block out ext4_get_block() block instantiations across the entire |
3503 | * transaction, and VFS/VM ensures that ext4_truncate() cannot run | |
ac27a0ec DK |
3504 | * simultaneously on behalf of the same inode. |
3505 | * | |
42b2aa86 | 3506 | * As we work through the truncate and commit bits of it to the journal there |
ac27a0ec DK |
3507 | * is one core, guiding principle: the file's tree must always be consistent on |
3508 | * disk. We must be able to restart the truncate after a crash. | |
3509 | * | |
3510 | * The file's tree may be transiently inconsistent in memory (although it | |
3511 | * probably isn't), but whenever we close off and commit a journal transaction, | |
3512 | * the contents of (the filesystem + the journal) must be consistent and | |
3513 | * restartable. It's pretty simple, really: bottom up, right to left (although | |
3514 | * left-to-right works OK too). | |
3515 | * | |
3516 | * Note that at recovery time, journal replay occurs *before* the restart of | |
3517 | * truncate against the orphan inode list. | |
3518 | * | |
3519 | * The committed inode has the new, desired i_size (which is the same as | |
617ba13b | 3520 | * i_disksize in this case). After a crash, ext4_orphan_cleanup() will see |
ac27a0ec | 3521 | * that this inode's truncate did not complete and it will again call |
617ba13b MC |
3522 | * ext4_truncate() to have another go. So there will be instantiated blocks |
3523 | * to the right of the truncation point in a crashed ext4 filesystem. But | |
ac27a0ec | 3524 | * that's fine - as long as they are linked from the inode, the post-crash |
617ba13b | 3525 | * ext4_truncate() run will find them and release them. |
ac27a0ec | 3526 | */ |
617ba13b | 3527 | void ext4_truncate(struct inode *inode) |
ac27a0ec | 3528 | { |
0562e0ba JZ |
3529 | trace_ext4_truncate_enter(inode); |
3530 | ||
91ef4caf | 3531 | if (!ext4_can_truncate(inode)) |
ac27a0ec DK |
3532 | return; |
3533 | ||
12e9b892 | 3534 | ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS); |
c8d46e41 | 3535 | |
5534fb5b | 3536 | if (inode->i_size == 0 && !test_opt(inode->i_sb, NO_AUTO_DA_ALLOC)) |
19f5fb7a | 3537 | ext4_set_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE); |
7d8f9f7d | 3538 | |
aef1c851 TM |
3539 | if (ext4_has_inline_data(inode)) { |
3540 | int has_inline = 1; | |
3541 | ||
3542 | ext4_inline_data_truncate(inode, &has_inline); | |
3543 | if (has_inline) | |
3544 | return; | |
3545 | } | |
3546 | ||
ff9893dc | 3547 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
cf108bca | 3548 | ext4_ext_truncate(inode); |
ff9893dc AG |
3549 | else |
3550 | ext4_ind_truncate(inode); | |
ac27a0ec | 3551 | |
0562e0ba | 3552 | trace_ext4_truncate_exit(inode); |
ac27a0ec DK |
3553 | } |
3554 | ||
ac27a0ec | 3555 | /* |
617ba13b | 3556 | * ext4_get_inode_loc returns with an extra refcount against the inode's |
ac27a0ec DK |
3557 | * underlying buffer_head on success. If 'in_mem' is true, we have all |
3558 | * data in memory that is needed to recreate the on-disk version of this | |
3559 | * inode. | |
3560 | */ | |
617ba13b MC |
3561 | static int __ext4_get_inode_loc(struct inode *inode, |
3562 | struct ext4_iloc *iloc, int in_mem) | |
ac27a0ec | 3563 | { |
240799cd TT |
3564 | struct ext4_group_desc *gdp; |
3565 | struct buffer_head *bh; | |
3566 | struct super_block *sb = inode->i_sb; | |
3567 | ext4_fsblk_t block; | |
3568 | int inodes_per_block, inode_offset; | |
3569 | ||
3a06d778 | 3570 | iloc->bh = NULL; |
240799cd TT |
3571 | if (!ext4_valid_inum(sb, inode->i_ino)) |
3572 | return -EIO; | |
ac27a0ec | 3573 | |
240799cd TT |
3574 | iloc->block_group = (inode->i_ino - 1) / EXT4_INODES_PER_GROUP(sb); |
3575 | gdp = ext4_get_group_desc(sb, iloc->block_group, NULL); | |
3576 | if (!gdp) | |
ac27a0ec DK |
3577 | return -EIO; |
3578 | ||
240799cd TT |
3579 | /* |
3580 | * Figure out the offset within the block group inode table | |
3581 | */ | |
00d09882 | 3582 | inodes_per_block = EXT4_SB(sb)->s_inodes_per_block; |
240799cd TT |
3583 | inode_offset = ((inode->i_ino - 1) % |
3584 | EXT4_INODES_PER_GROUP(sb)); | |
3585 | block = ext4_inode_table(sb, gdp) + (inode_offset / inodes_per_block); | |
3586 | iloc->offset = (inode_offset % inodes_per_block) * EXT4_INODE_SIZE(sb); | |
3587 | ||
3588 | bh = sb_getblk(sb, block); | |
aebf0243 | 3589 | if (unlikely(!bh)) |
860d21e2 | 3590 | return -ENOMEM; |
ac27a0ec DK |
3591 | if (!buffer_uptodate(bh)) { |
3592 | lock_buffer(bh); | |
9c83a923 HK |
3593 | |
3594 | /* | |
3595 | * If the buffer has the write error flag, we have failed | |
3596 | * to write out another inode in the same block. In this | |
3597 | * case, we don't have to read the block because we may | |
3598 | * read the old inode data successfully. | |
3599 | */ | |
3600 | if (buffer_write_io_error(bh) && !buffer_uptodate(bh)) | |
3601 | set_buffer_uptodate(bh); | |
3602 | ||
ac27a0ec DK |
3603 | if (buffer_uptodate(bh)) { |
3604 | /* someone brought it uptodate while we waited */ | |
3605 | unlock_buffer(bh); | |
3606 | goto has_buffer; | |
3607 | } | |
3608 | ||
3609 | /* | |
3610 | * If we have all information of the inode in memory and this | |
3611 | * is the only valid inode in the block, we need not read the | |
3612 | * block. | |
3613 | */ | |
3614 | if (in_mem) { | |
3615 | struct buffer_head *bitmap_bh; | |
240799cd | 3616 | int i, start; |
ac27a0ec | 3617 | |
240799cd | 3618 | start = inode_offset & ~(inodes_per_block - 1); |
ac27a0ec | 3619 | |
240799cd TT |
3620 | /* Is the inode bitmap in cache? */ |
3621 | bitmap_bh = sb_getblk(sb, ext4_inode_bitmap(sb, gdp)); | |
aebf0243 | 3622 | if (unlikely(!bitmap_bh)) |
ac27a0ec DK |
3623 | goto make_io; |
3624 | ||
3625 | /* | |
3626 | * If the inode bitmap isn't in cache then the | |
3627 | * optimisation may end up performing two reads instead | |
3628 | * of one, so skip it. | |
3629 | */ | |
3630 | if (!buffer_uptodate(bitmap_bh)) { | |
3631 | brelse(bitmap_bh); | |
3632 | goto make_io; | |
3633 | } | |
240799cd | 3634 | for (i = start; i < start + inodes_per_block; i++) { |
ac27a0ec DK |
3635 | if (i == inode_offset) |
3636 | continue; | |
617ba13b | 3637 | if (ext4_test_bit(i, bitmap_bh->b_data)) |
ac27a0ec DK |
3638 | break; |
3639 | } | |
3640 | brelse(bitmap_bh); | |
240799cd | 3641 | if (i == start + inodes_per_block) { |
ac27a0ec DK |
3642 | /* all other inodes are free, so skip I/O */ |
3643 | memset(bh->b_data, 0, bh->b_size); | |
3644 | set_buffer_uptodate(bh); | |
3645 | unlock_buffer(bh); | |
3646 | goto has_buffer; | |
3647 | } | |
3648 | } | |
3649 | ||
3650 | make_io: | |
240799cd TT |
3651 | /* |
3652 | * If we need to do any I/O, try to pre-readahead extra | |
3653 | * blocks from the inode table. | |
3654 | */ | |
3655 | if (EXT4_SB(sb)->s_inode_readahead_blks) { | |
3656 | ext4_fsblk_t b, end, table; | |
3657 | unsigned num; | |
3658 | ||
3659 | table = ext4_inode_table(sb, gdp); | |
b713a5ec | 3660 | /* s_inode_readahead_blks is always a power of 2 */ |
240799cd TT |
3661 | b = block & ~(EXT4_SB(sb)->s_inode_readahead_blks-1); |
3662 | if (table > b) | |
3663 | b = table; | |
3664 | end = b + EXT4_SB(sb)->s_inode_readahead_blks; | |
3665 | num = EXT4_INODES_PER_GROUP(sb); | |
feb0ab32 | 3666 | if (ext4_has_group_desc_csum(sb)) |
560671a0 | 3667 | num -= ext4_itable_unused_count(sb, gdp); |
240799cd TT |
3668 | table += num / inodes_per_block; |
3669 | if (end > table) | |
3670 | end = table; | |
3671 | while (b <= end) | |
3672 | sb_breadahead(sb, b++); | |
3673 | } | |
3674 | ||
ac27a0ec DK |
3675 | /* |
3676 | * There are other valid inodes in the buffer, this inode | |
3677 | * has in-inode xattrs, or we don't have this inode in memory. | |
3678 | * Read the block from disk. | |
3679 | */ | |
0562e0ba | 3680 | trace_ext4_load_inode(inode); |
ac27a0ec DK |
3681 | get_bh(bh); |
3682 | bh->b_end_io = end_buffer_read_sync; | |
65299a3b | 3683 | submit_bh(READ | REQ_META | REQ_PRIO, bh); |
ac27a0ec DK |
3684 | wait_on_buffer(bh); |
3685 | if (!buffer_uptodate(bh)) { | |
c398eda0 TT |
3686 | EXT4_ERROR_INODE_BLOCK(inode, block, |
3687 | "unable to read itable block"); | |
ac27a0ec DK |
3688 | brelse(bh); |
3689 | return -EIO; | |
3690 | } | |
3691 | } | |
3692 | has_buffer: | |
3693 | iloc->bh = bh; | |
3694 | return 0; | |
3695 | } | |
3696 | ||
617ba13b | 3697 | int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc) |
ac27a0ec DK |
3698 | { |
3699 | /* We have all inode data except xattrs in memory here. */ | |
617ba13b | 3700 | return __ext4_get_inode_loc(inode, iloc, |
19f5fb7a | 3701 | !ext4_test_inode_state(inode, EXT4_STATE_XATTR)); |
ac27a0ec DK |
3702 | } |
3703 | ||
617ba13b | 3704 | void ext4_set_inode_flags(struct inode *inode) |
ac27a0ec | 3705 | { |
617ba13b | 3706 | unsigned int flags = EXT4_I(inode)->i_flags; |
ac27a0ec DK |
3707 | |
3708 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
617ba13b | 3709 | if (flags & EXT4_SYNC_FL) |
ac27a0ec | 3710 | inode->i_flags |= S_SYNC; |
617ba13b | 3711 | if (flags & EXT4_APPEND_FL) |
ac27a0ec | 3712 | inode->i_flags |= S_APPEND; |
617ba13b | 3713 | if (flags & EXT4_IMMUTABLE_FL) |
ac27a0ec | 3714 | inode->i_flags |= S_IMMUTABLE; |
617ba13b | 3715 | if (flags & EXT4_NOATIME_FL) |
ac27a0ec | 3716 | inode->i_flags |= S_NOATIME; |
617ba13b | 3717 | if (flags & EXT4_DIRSYNC_FL) |
ac27a0ec DK |
3718 | inode->i_flags |= S_DIRSYNC; |
3719 | } | |
3720 | ||
ff9ddf7e JK |
3721 | /* Propagate flags from i_flags to EXT4_I(inode)->i_flags */ |
3722 | void ext4_get_inode_flags(struct ext4_inode_info *ei) | |
3723 | { | |
84a8dce2 DM |
3724 | unsigned int vfs_fl; |
3725 | unsigned long old_fl, new_fl; | |
3726 | ||
3727 | do { | |
3728 | vfs_fl = ei->vfs_inode.i_flags; | |
3729 | old_fl = ei->i_flags; | |
3730 | new_fl = old_fl & ~(EXT4_SYNC_FL|EXT4_APPEND_FL| | |
3731 | EXT4_IMMUTABLE_FL|EXT4_NOATIME_FL| | |
3732 | EXT4_DIRSYNC_FL); | |
3733 | if (vfs_fl & S_SYNC) | |
3734 | new_fl |= EXT4_SYNC_FL; | |
3735 | if (vfs_fl & S_APPEND) | |
3736 | new_fl |= EXT4_APPEND_FL; | |
3737 | if (vfs_fl & S_IMMUTABLE) | |
3738 | new_fl |= EXT4_IMMUTABLE_FL; | |
3739 | if (vfs_fl & S_NOATIME) | |
3740 | new_fl |= EXT4_NOATIME_FL; | |
3741 | if (vfs_fl & S_DIRSYNC) | |
3742 | new_fl |= EXT4_DIRSYNC_FL; | |
3743 | } while (cmpxchg(&ei->i_flags, old_fl, new_fl) != old_fl); | |
ff9ddf7e | 3744 | } |
de9a55b8 | 3745 | |
0fc1b451 | 3746 | static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode, |
de9a55b8 | 3747 | struct ext4_inode_info *ei) |
0fc1b451 AK |
3748 | { |
3749 | blkcnt_t i_blocks ; | |
8180a562 AK |
3750 | struct inode *inode = &(ei->vfs_inode); |
3751 | struct super_block *sb = inode->i_sb; | |
0fc1b451 AK |
3752 | |
3753 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
3754 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { | |
3755 | /* we are using combined 48 bit field */ | |
3756 | i_blocks = ((u64)le16_to_cpu(raw_inode->i_blocks_high)) << 32 | | |
3757 | le32_to_cpu(raw_inode->i_blocks_lo); | |
07a03824 | 3758 | if (ext4_test_inode_flag(inode, EXT4_INODE_HUGE_FILE)) { |
8180a562 AK |
3759 | /* i_blocks represent file system block size */ |
3760 | return i_blocks << (inode->i_blkbits - 9); | |
3761 | } else { | |
3762 | return i_blocks; | |
3763 | } | |
0fc1b451 AK |
3764 | } else { |
3765 | return le32_to_cpu(raw_inode->i_blocks_lo); | |
3766 | } | |
3767 | } | |
ff9ddf7e | 3768 | |
152a7b0a TM |
3769 | static inline void ext4_iget_extra_inode(struct inode *inode, |
3770 | struct ext4_inode *raw_inode, | |
3771 | struct ext4_inode_info *ei) | |
3772 | { | |
3773 | __le32 *magic = (void *)raw_inode + | |
3774 | EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize; | |
67cf5b09 | 3775 | if (*magic == cpu_to_le32(EXT4_XATTR_MAGIC)) { |
152a7b0a | 3776 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
67cf5b09 | 3777 | ext4_find_inline_data_nolock(inode); |
f19d5870 TM |
3778 | } else |
3779 | EXT4_I(inode)->i_inline_off = 0; | |
152a7b0a TM |
3780 | } |
3781 | ||
1d1fe1ee | 3782 | struct inode *ext4_iget(struct super_block *sb, unsigned long ino) |
ac27a0ec | 3783 | { |
617ba13b MC |
3784 | struct ext4_iloc iloc; |
3785 | struct ext4_inode *raw_inode; | |
1d1fe1ee | 3786 | struct ext4_inode_info *ei; |
1d1fe1ee | 3787 | struct inode *inode; |
b436b9be | 3788 | journal_t *journal = EXT4_SB(sb)->s_journal; |
1d1fe1ee | 3789 | long ret; |
ac27a0ec | 3790 | int block; |
08cefc7a EB |
3791 | uid_t i_uid; |
3792 | gid_t i_gid; | |
ac27a0ec | 3793 | |
1d1fe1ee DH |
3794 | inode = iget_locked(sb, ino); |
3795 | if (!inode) | |
3796 | return ERR_PTR(-ENOMEM); | |
3797 | if (!(inode->i_state & I_NEW)) | |
3798 | return inode; | |
3799 | ||
3800 | ei = EXT4_I(inode); | |
7dc57615 | 3801 | iloc.bh = NULL; |
ac27a0ec | 3802 | |
1d1fe1ee DH |
3803 | ret = __ext4_get_inode_loc(inode, &iloc, 0); |
3804 | if (ret < 0) | |
ac27a0ec | 3805 | goto bad_inode; |
617ba13b | 3806 | raw_inode = ext4_raw_inode(&iloc); |
814525f4 DW |
3807 | |
3808 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) { | |
3809 | ei->i_extra_isize = le16_to_cpu(raw_inode->i_extra_isize); | |
3810 | if (EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize > | |
3811 | EXT4_INODE_SIZE(inode->i_sb)) { | |
3812 | EXT4_ERROR_INODE(inode, "bad extra_isize (%u != %u)", | |
3813 | EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize, | |
3814 | EXT4_INODE_SIZE(inode->i_sb)); | |
3815 | ret = -EIO; | |
3816 | goto bad_inode; | |
3817 | } | |
3818 | } else | |
3819 | ei->i_extra_isize = 0; | |
3820 | ||
3821 | /* Precompute checksum seed for inode metadata */ | |
3822 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
3823 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) { | |
3824 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
3825 | __u32 csum; | |
3826 | __le32 inum = cpu_to_le32(inode->i_ino); | |
3827 | __le32 gen = raw_inode->i_generation; | |
3828 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, | |
3829 | sizeof(inum)); | |
3830 | ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, | |
3831 | sizeof(gen)); | |
3832 | } | |
3833 | ||
3834 | if (!ext4_inode_csum_verify(inode, raw_inode, ei)) { | |
3835 | EXT4_ERROR_INODE(inode, "checksum invalid"); | |
3836 | ret = -EIO; | |
3837 | goto bad_inode; | |
3838 | } | |
3839 | ||
ac27a0ec | 3840 | inode->i_mode = le16_to_cpu(raw_inode->i_mode); |
08cefc7a EB |
3841 | i_uid = (uid_t)le16_to_cpu(raw_inode->i_uid_low); |
3842 | i_gid = (gid_t)le16_to_cpu(raw_inode->i_gid_low); | |
af5bc92d | 3843 | if (!(test_opt(inode->i_sb, NO_UID32))) { |
08cefc7a EB |
3844 | i_uid |= le16_to_cpu(raw_inode->i_uid_high) << 16; |
3845 | i_gid |= le16_to_cpu(raw_inode->i_gid_high) << 16; | |
ac27a0ec | 3846 | } |
08cefc7a EB |
3847 | i_uid_write(inode, i_uid); |
3848 | i_gid_write(inode, i_gid); | |
bfe86848 | 3849 | set_nlink(inode, le16_to_cpu(raw_inode->i_links_count)); |
ac27a0ec | 3850 | |
353eb83c | 3851 | ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */ |
67cf5b09 | 3852 | ei->i_inline_off = 0; |
ac27a0ec DK |
3853 | ei->i_dir_start_lookup = 0; |
3854 | ei->i_dtime = le32_to_cpu(raw_inode->i_dtime); | |
3855 | /* We now have enough fields to check if the inode was active or not. | |
3856 | * This is needed because nfsd might try to access dead inodes | |
3857 | * the test is that same one that e2fsck uses | |
3858 | * NeilBrown 1999oct15 | |
3859 | */ | |
3860 | if (inode->i_nlink == 0) { | |
3861 | if (inode->i_mode == 0 || | |
617ba13b | 3862 | !(EXT4_SB(inode->i_sb)->s_mount_state & EXT4_ORPHAN_FS)) { |
ac27a0ec | 3863 | /* this inode is deleted */ |
1d1fe1ee | 3864 | ret = -ESTALE; |
ac27a0ec DK |
3865 | goto bad_inode; |
3866 | } | |
3867 | /* The only unlinked inodes we let through here have | |
3868 | * valid i_mode and are being read by the orphan | |
3869 | * recovery code: that's fine, we're about to complete | |
3870 | * the process of deleting those. */ | |
3871 | } | |
ac27a0ec | 3872 | ei->i_flags = le32_to_cpu(raw_inode->i_flags); |
0fc1b451 | 3873 | inode->i_blocks = ext4_inode_blocks(raw_inode, ei); |
7973c0c1 | 3874 | ei->i_file_acl = le32_to_cpu(raw_inode->i_file_acl_lo); |
a9e81742 | 3875 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) |
a1ddeb7e BP |
3876 | ei->i_file_acl |= |
3877 | ((__u64)le16_to_cpu(raw_inode->i_file_acl_high)) << 32; | |
a48380f7 | 3878 | inode->i_size = ext4_isize(raw_inode); |
ac27a0ec | 3879 | ei->i_disksize = inode->i_size; |
a9e7f447 DM |
3880 | #ifdef CONFIG_QUOTA |
3881 | ei->i_reserved_quota = 0; | |
3882 | #endif | |
ac27a0ec DK |
3883 | inode->i_generation = le32_to_cpu(raw_inode->i_generation); |
3884 | ei->i_block_group = iloc.block_group; | |
a4912123 | 3885 | ei->i_last_alloc_group = ~0; |
ac27a0ec DK |
3886 | /* |
3887 | * NOTE! The in-memory inode i_data array is in little-endian order | |
3888 | * even on big-endian machines: we do NOT byteswap the block numbers! | |
3889 | */ | |
617ba13b | 3890 | for (block = 0; block < EXT4_N_BLOCKS; block++) |
ac27a0ec DK |
3891 | ei->i_data[block] = raw_inode->i_block[block]; |
3892 | INIT_LIST_HEAD(&ei->i_orphan); | |
3893 | ||
b436b9be JK |
3894 | /* |
3895 | * Set transaction id's of transactions that have to be committed | |
3896 | * to finish f[data]sync. We set them to currently running transaction | |
3897 | * as we cannot be sure that the inode or some of its metadata isn't | |
3898 | * part of the transaction - the inode could have been reclaimed and | |
3899 | * now it is reread from disk. | |
3900 | */ | |
3901 | if (journal) { | |
3902 | transaction_t *transaction; | |
3903 | tid_t tid; | |
3904 | ||
a931da6a | 3905 | read_lock(&journal->j_state_lock); |
b436b9be JK |
3906 | if (journal->j_running_transaction) |
3907 | transaction = journal->j_running_transaction; | |
3908 | else | |
3909 | transaction = journal->j_committing_transaction; | |
3910 | if (transaction) | |
3911 | tid = transaction->t_tid; | |
3912 | else | |
3913 | tid = journal->j_commit_sequence; | |
a931da6a | 3914 | read_unlock(&journal->j_state_lock); |
b436b9be JK |
3915 | ei->i_sync_tid = tid; |
3916 | ei->i_datasync_tid = tid; | |
3917 | } | |
3918 | ||
0040d987 | 3919 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) { |
ac27a0ec DK |
3920 | if (ei->i_extra_isize == 0) { |
3921 | /* The extra space is currently unused. Use it. */ | |
617ba13b MC |
3922 | ei->i_extra_isize = sizeof(struct ext4_inode) - |
3923 | EXT4_GOOD_OLD_INODE_SIZE; | |
ac27a0ec | 3924 | } else { |
152a7b0a | 3925 | ext4_iget_extra_inode(inode, raw_inode, ei); |
ac27a0ec | 3926 | } |
814525f4 | 3927 | } |
ac27a0ec | 3928 | |
ef7f3835 KS |
3929 | EXT4_INODE_GET_XTIME(i_ctime, inode, raw_inode); |
3930 | EXT4_INODE_GET_XTIME(i_mtime, inode, raw_inode); | |
3931 | EXT4_INODE_GET_XTIME(i_atime, inode, raw_inode); | |
3932 | EXT4_EINODE_GET_XTIME(i_crtime, ei, raw_inode); | |
3933 | ||
25ec56b5 JNC |
3934 | inode->i_version = le32_to_cpu(raw_inode->i_disk_version); |
3935 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) { | |
3936 | if (EXT4_FITS_IN_INODE(raw_inode, ei, i_version_hi)) | |
3937 | inode->i_version |= | |
3938 | (__u64)(le32_to_cpu(raw_inode->i_version_hi)) << 32; | |
3939 | } | |
3940 | ||
c4b5a614 | 3941 | ret = 0; |
485c26ec | 3942 | if (ei->i_file_acl && |
1032988c | 3943 | !ext4_data_block_valid(EXT4_SB(sb), ei->i_file_acl, 1)) { |
24676da4 TT |
3944 | EXT4_ERROR_INODE(inode, "bad extended attribute block %llu", |
3945 | ei->i_file_acl); | |
485c26ec TT |
3946 | ret = -EIO; |
3947 | goto bad_inode; | |
f19d5870 TM |
3948 | } else if (!ext4_has_inline_data(inode)) { |
3949 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { | |
3950 | if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
3951 | (S_ISLNK(inode->i_mode) && | |
3952 | !ext4_inode_is_fast_symlink(inode)))) | |
3953 | /* Validate extent which is part of inode */ | |
3954 | ret = ext4_ext_check_inode(inode); | |
3955 | } else if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
3956 | (S_ISLNK(inode->i_mode) && | |
3957 | !ext4_inode_is_fast_symlink(inode))) { | |
3958 | /* Validate block references which are part of inode */ | |
3959 | ret = ext4_ind_check_inode(inode); | |
3960 | } | |
fe2c8191 | 3961 | } |
567f3e9a | 3962 | if (ret) |
de9a55b8 | 3963 | goto bad_inode; |
7a262f7c | 3964 | |
ac27a0ec | 3965 | if (S_ISREG(inode->i_mode)) { |
617ba13b MC |
3966 | inode->i_op = &ext4_file_inode_operations; |
3967 | inode->i_fop = &ext4_file_operations; | |
3968 | ext4_set_aops(inode); | |
ac27a0ec | 3969 | } else if (S_ISDIR(inode->i_mode)) { |
617ba13b MC |
3970 | inode->i_op = &ext4_dir_inode_operations; |
3971 | inode->i_fop = &ext4_dir_operations; | |
ac27a0ec | 3972 | } else if (S_ISLNK(inode->i_mode)) { |
e83c1397 | 3973 | if (ext4_inode_is_fast_symlink(inode)) { |
617ba13b | 3974 | inode->i_op = &ext4_fast_symlink_inode_operations; |
e83c1397 DG |
3975 | nd_terminate_link(ei->i_data, inode->i_size, |
3976 | sizeof(ei->i_data) - 1); | |
3977 | } else { | |
617ba13b MC |
3978 | inode->i_op = &ext4_symlink_inode_operations; |
3979 | ext4_set_aops(inode); | |
ac27a0ec | 3980 | } |
563bdd61 TT |
3981 | } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || |
3982 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
617ba13b | 3983 | inode->i_op = &ext4_special_inode_operations; |
ac27a0ec DK |
3984 | if (raw_inode->i_block[0]) |
3985 | init_special_inode(inode, inode->i_mode, | |
3986 | old_decode_dev(le32_to_cpu(raw_inode->i_block[0]))); | |
3987 | else | |
3988 | init_special_inode(inode, inode->i_mode, | |
3989 | new_decode_dev(le32_to_cpu(raw_inode->i_block[1]))); | |
563bdd61 | 3990 | } else { |
563bdd61 | 3991 | ret = -EIO; |
24676da4 | 3992 | EXT4_ERROR_INODE(inode, "bogus i_mode (%o)", inode->i_mode); |
563bdd61 | 3993 | goto bad_inode; |
ac27a0ec | 3994 | } |
af5bc92d | 3995 | brelse(iloc.bh); |
617ba13b | 3996 | ext4_set_inode_flags(inode); |
1d1fe1ee DH |
3997 | unlock_new_inode(inode); |
3998 | return inode; | |
ac27a0ec DK |
3999 | |
4000 | bad_inode: | |
567f3e9a | 4001 | brelse(iloc.bh); |
1d1fe1ee DH |
4002 | iget_failed(inode); |
4003 | return ERR_PTR(ret); | |
ac27a0ec DK |
4004 | } |
4005 | ||
0fc1b451 AK |
4006 | static int ext4_inode_blocks_set(handle_t *handle, |
4007 | struct ext4_inode *raw_inode, | |
4008 | struct ext4_inode_info *ei) | |
4009 | { | |
4010 | struct inode *inode = &(ei->vfs_inode); | |
4011 | u64 i_blocks = inode->i_blocks; | |
4012 | struct super_block *sb = inode->i_sb; | |
0fc1b451 AK |
4013 | |
4014 | if (i_blocks <= ~0U) { | |
4015 | /* | |
4907cb7b | 4016 | * i_blocks can be represented in a 32 bit variable |
0fc1b451 AK |
4017 | * as multiple of 512 bytes |
4018 | */ | |
8180a562 | 4019 | raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); |
0fc1b451 | 4020 | raw_inode->i_blocks_high = 0; |
84a8dce2 | 4021 | ext4_clear_inode_flag(inode, EXT4_INODE_HUGE_FILE); |
f287a1a5 TT |
4022 | return 0; |
4023 | } | |
4024 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) | |
4025 | return -EFBIG; | |
4026 | ||
4027 | if (i_blocks <= 0xffffffffffffULL) { | |
0fc1b451 AK |
4028 | /* |
4029 | * i_blocks can be represented in a 48 bit variable | |
4030 | * as multiple of 512 bytes | |
4031 | */ | |
8180a562 | 4032 | raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); |
0fc1b451 | 4033 | raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32); |
84a8dce2 | 4034 | ext4_clear_inode_flag(inode, EXT4_INODE_HUGE_FILE); |
0fc1b451 | 4035 | } else { |
84a8dce2 | 4036 | ext4_set_inode_flag(inode, EXT4_INODE_HUGE_FILE); |
8180a562 AK |
4037 | /* i_block is stored in file system block size */ |
4038 | i_blocks = i_blocks >> (inode->i_blkbits - 9); | |
4039 | raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); | |
4040 | raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32); | |
0fc1b451 | 4041 | } |
f287a1a5 | 4042 | return 0; |
0fc1b451 AK |
4043 | } |
4044 | ||
ac27a0ec DK |
4045 | /* |
4046 | * Post the struct inode info into an on-disk inode location in the | |
4047 | * buffer-cache. This gobbles the caller's reference to the | |
4048 | * buffer_head in the inode location struct. | |
4049 | * | |
4050 | * The caller must have write access to iloc->bh. | |
4051 | */ | |
617ba13b | 4052 | static int ext4_do_update_inode(handle_t *handle, |
ac27a0ec | 4053 | struct inode *inode, |
830156c7 | 4054 | struct ext4_iloc *iloc) |
ac27a0ec | 4055 | { |
617ba13b MC |
4056 | struct ext4_inode *raw_inode = ext4_raw_inode(iloc); |
4057 | struct ext4_inode_info *ei = EXT4_I(inode); | |
ac27a0ec DK |
4058 | struct buffer_head *bh = iloc->bh; |
4059 | int err = 0, rc, block; | |
b71fc079 | 4060 | int need_datasync = 0; |
08cefc7a EB |
4061 | uid_t i_uid; |
4062 | gid_t i_gid; | |
ac27a0ec DK |
4063 | |
4064 | /* For fields not not tracking in the in-memory inode, | |
4065 | * initialise them to zero for new inodes. */ | |
19f5fb7a | 4066 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) |
617ba13b | 4067 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); |
ac27a0ec | 4068 | |
ff9ddf7e | 4069 | ext4_get_inode_flags(ei); |
ac27a0ec | 4070 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); |
08cefc7a EB |
4071 | i_uid = i_uid_read(inode); |
4072 | i_gid = i_gid_read(inode); | |
af5bc92d | 4073 | if (!(test_opt(inode->i_sb, NO_UID32))) { |
08cefc7a EB |
4074 | raw_inode->i_uid_low = cpu_to_le16(low_16_bits(i_uid)); |
4075 | raw_inode->i_gid_low = cpu_to_le16(low_16_bits(i_gid)); | |
ac27a0ec DK |
4076 | /* |
4077 | * Fix up interoperability with old kernels. Otherwise, old inodes get | |
4078 | * re-used with the upper 16 bits of the uid/gid intact | |
4079 | */ | |
af5bc92d | 4080 | if (!ei->i_dtime) { |
ac27a0ec | 4081 | raw_inode->i_uid_high = |
08cefc7a | 4082 | cpu_to_le16(high_16_bits(i_uid)); |
ac27a0ec | 4083 | raw_inode->i_gid_high = |
08cefc7a | 4084 | cpu_to_le16(high_16_bits(i_gid)); |
ac27a0ec DK |
4085 | } else { |
4086 | raw_inode->i_uid_high = 0; | |
4087 | raw_inode->i_gid_high = 0; | |
4088 | } | |
4089 | } else { | |
08cefc7a EB |
4090 | raw_inode->i_uid_low = cpu_to_le16(fs_high2lowuid(i_uid)); |
4091 | raw_inode->i_gid_low = cpu_to_le16(fs_high2lowgid(i_gid)); | |
ac27a0ec DK |
4092 | raw_inode->i_uid_high = 0; |
4093 | raw_inode->i_gid_high = 0; | |
4094 | } | |
4095 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); | |
ef7f3835 KS |
4096 | |
4097 | EXT4_INODE_SET_XTIME(i_ctime, inode, raw_inode); | |
4098 | EXT4_INODE_SET_XTIME(i_mtime, inode, raw_inode); | |
4099 | EXT4_INODE_SET_XTIME(i_atime, inode, raw_inode); | |
4100 | EXT4_EINODE_SET_XTIME(i_crtime, ei, raw_inode); | |
4101 | ||
0fc1b451 AK |
4102 | if (ext4_inode_blocks_set(handle, raw_inode, ei)) |
4103 | goto out_brelse; | |
ac27a0ec | 4104 | raw_inode->i_dtime = cpu_to_le32(ei->i_dtime); |
353eb83c | 4105 | raw_inode->i_flags = cpu_to_le32(ei->i_flags & 0xFFFFFFFF); |
9b8f1f01 MC |
4106 | if (EXT4_SB(inode->i_sb)->s_es->s_creator_os != |
4107 | cpu_to_le32(EXT4_OS_HURD)) | |
a1ddeb7e BP |
4108 | raw_inode->i_file_acl_high = |
4109 | cpu_to_le16(ei->i_file_acl >> 32); | |
7973c0c1 | 4110 | raw_inode->i_file_acl_lo = cpu_to_le32(ei->i_file_acl); |
b71fc079 JK |
4111 | if (ei->i_disksize != ext4_isize(raw_inode)) { |
4112 | ext4_isize_set(raw_inode, ei->i_disksize); | |
4113 | need_datasync = 1; | |
4114 | } | |
a48380f7 AK |
4115 | if (ei->i_disksize > 0x7fffffffULL) { |
4116 | struct super_block *sb = inode->i_sb; | |
4117 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
4118 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE) || | |
4119 | EXT4_SB(sb)->s_es->s_rev_level == | |
4120 | cpu_to_le32(EXT4_GOOD_OLD_REV)) { | |
4121 | /* If this is the first large file | |
4122 | * created, add a flag to the superblock. | |
4123 | */ | |
4124 | err = ext4_journal_get_write_access(handle, | |
4125 | EXT4_SB(sb)->s_sbh); | |
4126 | if (err) | |
4127 | goto out_brelse; | |
4128 | ext4_update_dynamic_rev(sb); | |
4129 | EXT4_SET_RO_COMPAT_FEATURE(sb, | |
617ba13b | 4130 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE); |
0390131b | 4131 | ext4_handle_sync(handle); |
b50924c2 | 4132 | err = ext4_handle_dirty_super(handle, sb); |
ac27a0ec DK |
4133 | } |
4134 | } | |
4135 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); | |
4136 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
4137 | if (old_valid_dev(inode->i_rdev)) { | |
4138 | raw_inode->i_block[0] = | |
4139 | cpu_to_le32(old_encode_dev(inode->i_rdev)); | |
4140 | raw_inode->i_block[1] = 0; | |
4141 | } else { | |
4142 | raw_inode->i_block[0] = 0; | |
4143 | raw_inode->i_block[1] = | |
4144 | cpu_to_le32(new_encode_dev(inode->i_rdev)); | |
4145 | raw_inode->i_block[2] = 0; | |
4146 | } | |
f19d5870 | 4147 | } else if (!ext4_has_inline_data(inode)) { |
de9a55b8 TT |
4148 | for (block = 0; block < EXT4_N_BLOCKS; block++) |
4149 | raw_inode->i_block[block] = ei->i_data[block]; | |
f19d5870 | 4150 | } |
ac27a0ec | 4151 | |
25ec56b5 JNC |
4152 | raw_inode->i_disk_version = cpu_to_le32(inode->i_version); |
4153 | if (ei->i_extra_isize) { | |
4154 | if (EXT4_FITS_IN_INODE(raw_inode, ei, i_version_hi)) | |
4155 | raw_inode->i_version_hi = | |
4156 | cpu_to_le32(inode->i_version >> 32); | |
ac27a0ec | 4157 | raw_inode->i_extra_isize = cpu_to_le16(ei->i_extra_isize); |
25ec56b5 JNC |
4158 | } |
4159 | ||
814525f4 DW |
4160 | ext4_inode_csum_set(inode, raw_inode, ei); |
4161 | ||
830156c7 | 4162 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); |
73b50c1c | 4163 | rc = ext4_handle_dirty_metadata(handle, NULL, bh); |
830156c7 FM |
4164 | if (!err) |
4165 | err = rc; | |
19f5fb7a | 4166 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec | 4167 | |
b71fc079 | 4168 | ext4_update_inode_fsync_trans(handle, inode, need_datasync); |
ac27a0ec | 4169 | out_brelse: |
af5bc92d | 4170 | brelse(bh); |
617ba13b | 4171 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
4172 | return err; |
4173 | } | |
4174 | ||
4175 | /* | |
617ba13b | 4176 | * ext4_write_inode() |
ac27a0ec DK |
4177 | * |
4178 | * We are called from a few places: | |
4179 | * | |
4180 | * - Within generic_file_write() for O_SYNC files. | |
4181 | * Here, there will be no transaction running. We wait for any running | |
4907cb7b | 4182 | * transaction to commit. |
ac27a0ec DK |
4183 | * |
4184 | * - Within sys_sync(), kupdate and such. | |
4185 | * We wait on commit, if tol to. | |
4186 | * | |
4187 | * - Within prune_icache() (PF_MEMALLOC == true) | |
4188 | * Here we simply return. We can't afford to block kswapd on the | |
4189 | * journal commit. | |
4190 | * | |
4191 | * In all cases it is actually safe for us to return without doing anything, | |
4192 | * because the inode has been copied into a raw inode buffer in | |
617ba13b | 4193 | * ext4_mark_inode_dirty(). This is a correctness thing for O_SYNC and for |
ac27a0ec DK |
4194 | * knfsd. |
4195 | * | |
4196 | * Note that we are absolutely dependent upon all inode dirtiers doing the | |
4197 | * right thing: they *must* call mark_inode_dirty() after dirtying info in | |
4198 | * which we are interested. | |
4199 | * | |
4200 | * It would be a bug for them to not do this. The code: | |
4201 | * | |
4202 | * mark_inode_dirty(inode) | |
4203 | * stuff(); | |
4204 | * inode->i_size = expr; | |
4205 | * | |
4206 | * is in error because a kswapd-driven write_inode() could occur while | |
4207 | * `stuff()' is running, and the new i_size will be lost. Plus the inode | |
4208 | * will no longer be on the superblock's dirty inode list. | |
4209 | */ | |
a9185b41 | 4210 | int ext4_write_inode(struct inode *inode, struct writeback_control *wbc) |
ac27a0ec | 4211 | { |
91ac6f43 FM |
4212 | int err; |
4213 | ||
ac27a0ec DK |
4214 | if (current->flags & PF_MEMALLOC) |
4215 | return 0; | |
4216 | ||
91ac6f43 FM |
4217 | if (EXT4_SB(inode->i_sb)->s_journal) { |
4218 | if (ext4_journal_current_handle()) { | |
4219 | jbd_debug(1, "called recursively, non-PF_MEMALLOC!\n"); | |
4220 | dump_stack(); | |
4221 | return -EIO; | |
4222 | } | |
ac27a0ec | 4223 | |
a9185b41 | 4224 | if (wbc->sync_mode != WB_SYNC_ALL) |
91ac6f43 FM |
4225 | return 0; |
4226 | ||
4227 | err = ext4_force_commit(inode->i_sb); | |
4228 | } else { | |
4229 | struct ext4_iloc iloc; | |
ac27a0ec | 4230 | |
8b472d73 | 4231 | err = __ext4_get_inode_loc(inode, &iloc, 0); |
91ac6f43 FM |
4232 | if (err) |
4233 | return err; | |
a9185b41 | 4234 | if (wbc->sync_mode == WB_SYNC_ALL) |
830156c7 FM |
4235 | sync_dirty_buffer(iloc.bh); |
4236 | if (buffer_req(iloc.bh) && !buffer_uptodate(iloc.bh)) { | |
c398eda0 TT |
4237 | EXT4_ERROR_INODE_BLOCK(inode, iloc.bh->b_blocknr, |
4238 | "IO error syncing inode"); | |
830156c7 FM |
4239 | err = -EIO; |
4240 | } | |
fd2dd9fb | 4241 | brelse(iloc.bh); |
91ac6f43 FM |
4242 | } |
4243 | return err; | |
ac27a0ec DK |
4244 | } |
4245 | ||
53e87268 JK |
4246 | /* |
4247 | * In data=journal mode ext4_journalled_invalidatepage() may fail to invalidate | |
4248 | * buffers that are attached to a page stradding i_size and are undergoing | |
4249 | * commit. In that case we have to wait for commit to finish and try again. | |
4250 | */ | |
4251 | static void ext4_wait_for_tail_page_commit(struct inode *inode) | |
4252 | { | |
4253 | struct page *page; | |
4254 | unsigned offset; | |
4255 | journal_t *journal = EXT4_SB(inode->i_sb)->s_journal; | |
4256 | tid_t commit_tid = 0; | |
4257 | int ret; | |
4258 | ||
4259 | offset = inode->i_size & (PAGE_CACHE_SIZE - 1); | |
4260 | /* | |
4261 | * All buffers in the last page remain valid? Then there's nothing to | |
4262 | * do. We do the check mainly to optimize the common PAGE_CACHE_SIZE == | |
4263 | * blocksize case | |
4264 | */ | |
4265 | if (offset > PAGE_CACHE_SIZE - (1 << inode->i_blkbits)) | |
4266 | return; | |
4267 | while (1) { | |
4268 | page = find_lock_page(inode->i_mapping, | |
4269 | inode->i_size >> PAGE_CACHE_SHIFT); | |
4270 | if (!page) | |
4271 | return; | |
4272 | ret = __ext4_journalled_invalidatepage(page, offset); | |
4273 | unlock_page(page); | |
4274 | page_cache_release(page); | |
4275 | if (ret != -EBUSY) | |
4276 | return; | |
4277 | commit_tid = 0; | |
4278 | read_lock(&journal->j_state_lock); | |
4279 | if (journal->j_committing_transaction) | |
4280 | commit_tid = journal->j_committing_transaction->t_tid; | |
4281 | read_unlock(&journal->j_state_lock); | |
4282 | if (commit_tid) | |
4283 | jbd2_log_wait_commit(journal, commit_tid); | |
4284 | } | |
4285 | } | |
4286 | ||
ac27a0ec | 4287 | /* |
617ba13b | 4288 | * ext4_setattr() |
ac27a0ec DK |
4289 | * |
4290 | * Called from notify_change. | |
4291 | * | |
4292 | * We want to trap VFS attempts to truncate the file as soon as | |
4293 | * possible. In particular, we want to make sure that when the VFS | |
4294 | * shrinks i_size, we put the inode on the orphan list and modify | |
4295 | * i_disksize immediately, so that during the subsequent flushing of | |
4296 | * dirty pages and freeing of disk blocks, we can guarantee that any | |
4297 | * commit will leave the blocks being flushed in an unused state on | |
4298 | * disk. (On recovery, the inode will get truncated and the blocks will | |
4299 | * be freed, so we have a strong guarantee that no future commit will | |
4300 | * leave these blocks visible to the user.) | |
4301 | * | |
678aaf48 JK |
4302 | * Another thing we have to assure is that if we are in ordered mode |
4303 | * and inode is still attached to the committing transaction, we must | |
4304 | * we start writeout of all the dirty pages which are being truncated. | |
4305 | * This way we are sure that all the data written in the previous | |
4306 | * transaction are already on disk (truncate waits for pages under | |
4307 | * writeback). | |
4308 | * | |
4309 | * Called with inode->i_mutex down. | |
ac27a0ec | 4310 | */ |
617ba13b | 4311 | int ext4_setattr(struct dentry *dentry, struct iattr *attr) |
ac27a0ec DK |
4312 | { |
4313 | struct inode *inode = dentry->d_inode; | |
4314 | int error, rc = 0; | |
3d287de3 | 4315 | int orphan = 0; |
ac27a0ec DK |
4316 | const unsigned int ia_valid = attr->ia_valid; |
4317 | ||
4318 | error = inode_change_ok(inode, attr); | |
4319 | if (error) | |
4320 | return error; | |
4321 | ||
12755627 | 4322 | if (is_quota_modification(inode, attr)) |
871a2931 | 4323 | dquot_initialize(inode); |
08cefc7a EB |
4324 | if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) || |
4325 | (ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) { | |
ac27a0ec DK |
4326 | handle_t *handle; |
4327 | ||
4328 | /* (user+group)*(old+new) structure, inode write (sb, | |
4329 | * inode block, ? - but truncate inode update has it) */ | |
9924a92a TT |
4330 | handle = ext4_journal_start(inode, EXT4_HT_QUOTA, |
4331 | (EXT4_MAXQUOTAS_INIT_BLOCKS(inode->i_sb) + | |
4332 | EXT4_MAXQUOTAS_DEL_BLOCKS(inode->i_sb)) + 3); | |
ac27a0ec DK |
4333 | if (IS_ERR(handle)) { |
4334 | error = PTR_ERR(handle); | |
4335 | goto err_out; | |
4336 | } | |
b43fa828 | 4337 | error = dquot_transfer(inode, attr); |
ac27a0ec | 4338 | if (error) { |
617ba13b | 4339 | ext4_journal_stop(handle); |
ac27a0ec DK |
4340 | return error; |
4341 | } | |
4342 | /* Update corresponding info in inode so that everything is in | |
4343 | * one transaction */ | |
4344 | if (attr->ia_valid & ATTR_UID) | |
4345 | inode->i_uid = attr->ia_uid; | |
4346 | if (attr->ia_valid & ATTR_GID) | |
4347 | inode->i_gid = attr->ia_gid; | |
617ba13b MC |
4348 | error = ext4_mark_inode_dirty(handle, inode); |
4349 | ext4_journal_stop(handle); | |
ac27a0ec DK |
4350 | } |
4351 | ||
e2b46574 | 4352 | if (attr->ia_valid & ATTR_SIZE) { |
562c72aa | 4353 | |
12e9b892 | 4354 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) { |
e2b46574 ES |
4355 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
4356 | ||
0c095c7f TT |
4357 | if (attr->ia_size > sbi->s_bitmap_maxbytes) |
4358 | return -EFBIG; | |
e2b46574 ES |
4359 | } |
4360 | } | |
4361 | ||
ac27a0ec | 4362 | if (S_ISREG(inode->i_mode) && |
c8d46e41 | 4363 | attr->ia_valid & ATTR_SIZE && |
072bd7ea | 4364 | (attr->ia_size < inode->i_size)) { |
ac27a0ec DK |
4365 | handle_t *handle; |
4366 | ||
9924a92a | 4367 | handle = ext4_journal_start(inode, EXT4_HT_INODE, 3); |
ac27a0ec DK |
4368 | if (IS_ERR(handle)) { |
4369 | error = PTR_ERR(handle); | |
4370 | goto err_out; | |
4371 | } | |
3d287de3 DM |
4372 | if (ext4_handle_valid(handle)) { |
4373 | error = ext4_orphan_add(handle, inode); | |
4374 | orphan = 1; | |
4375 | } | |
617ba13b MC |
4376 | EXT4_I(inode)->i_disksize = attr->ia_size; |
4377 | rc = ext4_mark_inode_dirty(handle, inode); | |
ac27a0ec DK |
4378 | if (!error) |
4379 | error = rc; | |
617ba13b | 4380 | ext4_journal_stop(handle); |
678aaf48 JK |
4381 | |
4382 | if (ext4_should_order_data(inode)) { | |
4383 | error = ext4_begin_ordered_truncate(inode, | |
4384 | attr->ia_size); | |
4385 | if (error) { | |
4386 | /* Do as much error cleanup as possible */ | |
9924a92a TT |
4387 | handle = ext4_journal_start(inode, |
4388 | EXT4_HT_INODE, 3); | |
678aaf48 JK |
4389 | if (IS_ERR(handle)) { |
4390 | ext4_orphan_del(NULL, inode); | |
4391 | goto err_out; | |
4392 | } | |
4393 | ext4_orphan_del(handle, inode); | |
3d287de3 | 4394 | orphan = 0; |
678aaf48 JK |
4395 | ext4_journal_stop(handle); |
4396 | goto err_out; | |
4397 | } | |
4398 | } | |
ac27a0ec DK |
4399 | } |
4400 | ||
072bd7ea | 4401 | if (attr->ia_valid & ATTR_SIZE) { |
53e87268 JK |
4402 | if (attr->ia_size != inode->i_size) { |
4403 | loff_t oldsize = inode->i_size; | |
4404 | ||
4405 | i_size_write(inode, attr->ia_size); | |
4406 | /* | |
4407 | * Blocks are going to be removed from the inode. Wait | |
4408 | * for dio in flight. Temporarily disable | |
4409 | * dioread_nolock to prevent livelock. | |
4410 | */ | |
1b65007e | 4411 | if (orphan) { |
53e87268 JK |
4412 | if (!ext4_should_journal_data(inode)) { |
4413 | ext4_inode_block_unlocked_dio(inode); | |
4414 | inode_dio_wait(inode); | |
4415 | ext4_inode_resume_unlocked_dio(inode); | |
4416 | } else | |
4417 | ext4_wait_for_tail_page_commit(inode); | |
1b65007e | 4418 | } |
53e87268 JK |
4419 | /* |
4420 | * Truncate pagecache after we've waited for commit | |
4421 | * in data=journal mode to make pages freeable. | |
4422 | */ | |
4423 | truncate_pagecache(inode, oldsize, inode->i_size); | |
1c9114f9 | 4424 | } |
afcff5d8 | 4425 | ext4_truncate(inode); |
072bd7ea | 4426 | } |
ac27a0ec | 4427 | |
1025774c CH |
4428 | if (!rc) { |
4429 | setattr_copy(inode, attr); | |
4430 | mark_inode_dirty(inode); | |
4431 | } | |
4432 | ||
4433 | /* | |
4434 | * If the call to ext4_truncate failed to get a transaction handle at | |
4435 | * all, we need to clean up the in-core orphan list manually. | |
4436 | */ | |
3d287de3 | 4437 | if (orphan && inode->i_nlink) |
617ba13b | 4438 | ext4_orphan_del(NULL, inode); |
ac27a0ec DK |
4439 | |
4440 | if (!rc && (ia_valid & ATTR_MODE)) | |
617ba13b | 4441 | rc = ext4_acl_chmod(inode); |
ac27a0ec DK |
4442 | |
4443 | err_out: | |
617ba13b | 4444 | ext4_std_error(inode->i_sb, error); |
ac27a0ec DK |
4445 | if (!error) |
4446 | error = rc; | |
4447 | return error; | |
4448 | } | |
4449 | ||
3e3398a0 MC |
4450 | int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, |
4451 | struct kstat *stat) | |
4452 | { | |
4453 | struct inode *inode; | |
4454 | unsigned long delalloc_blocks; | |
4455 | ||
4456 | inode = dentry->d_inode; | |
4457 | generic_fillattr(inode, stat); | |
4458 | ||
4459 | /* | |
4460 | * We can't update i_blocks if the block allocation is delayed | |
4461 | * otherwise in the case of system crash before the real block | |
4462 | * allocation is done, we will have i_blocks inconsistent with | |
4463 | * on-disk file blocks. | |
4464 | * We always keep i_blocks updated together with real | |
4465 | * allocation. But to not confuse with user, stat | |
4466 | * will return the blocks that include the delayed allocation | |
4467 | * blocks for this file. | |
4468 | */ | |
96607551 TM |
4469 | delalloc_blocks = EXT4_C2B(EXT4_SB(inode->i_sb), |
4470 | EXT4_I(inode)->i_reserved_data_blocks); | |
3e3398a0 MC |
4471 | |
4472 | stat->blocks += (delalloc_blocks << inode->i_sb->s_blocksize_bits)>>9; | |
4473 | return 0; | |
4474 | } | |
ac27a0ec | 4475 | |
a02908f1 MC |
4476 | static int ext4_index_trans_blocks(struct inode *inode, int nrblocks, int chunk) |
4477 | { | |
12e9b892 | 4478 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
8bb2b247 | 4479 | return ext4_ind_trans_blocks(inode, nrblocks, chunk); |
ac51d837 | 4480 | return ext4_ext_index_trans_blocks(inode, nrblocks, chunk); |
a02908f1 | 4481 | } |
ac51d837 | 4482 | |
ac27a0ec | 4483 | /* |
a02908f1 MC |
4484 | * Account for index blocks, block groups bitmaps and block group |
4485 | * descriptor blocks if modify datablocks and index blocks | |
4486 | * worse case, the indexs blocks spread over different block groups | |
ac27a0ec | 4487 | * |
a02908f1 | 4488 | * If datablocks are discontiguous, they are possible to spread over |
4907cb7b | 4489 | * different block groups too. If they are contiguous, with flexbg, |
a02908f1 | 4490 | * they could still across block group boundary. |
ac27a0ec | 4491 | * |
a02908f1 MC |
4492 | * Also account for superblock, inode, quota and xattr blocks |
4493 | */ | |
1f109d5a | 4494 | static int ext4_meta_trans_blocks(struct inode *inode, int nrblocks, int chunk) |
a02908f1 | 4495 | { |
8df9675f TT |
4496 | ext4_group_t groups, ngroups = ext4_get_groups_count(inode->i_sb); |
4497 | int gdpblocks; | |
a02908f1 MC |
4498 | int idxblocks; |
4499 | int ret = 0; | |
4500 | ||
4501 | /* | |
4502 | * How many index blocks need to touch to modify nrblocks? | |
4503 | * The "Chunk" flag indicating whether the nrblocks is | |
4504 | * physically contiguous on disk | |
4505 | * | |
4506 | * For Direct IO and fallocate, they calls get_block to allocate | |
4507 | * one single extent at a time, so they could set the "Chunk" flag | |
4508 | */ | |
4509 | idxblocks = ext4_index_trans_blocks(inode, nrblocks, chunk); | |
4510 | ||
4511 | ret = idxblocks; | |
4512 | ||
4513 | /* | |
4514 | * Now let's see how many group bitmaps and group descriptors need | |
4515 | * to account | |
4516 | */ | |
4517 | groups = idxblocks; | |
4518 | if (chunk) | |
4519 | groups += 1; | |
4520 | else | |
4521 | groups += nrblocks; | |
4522 | ||
4523 | gdpblocks = groups; | |
8df9675f TT |
4524 | if (groups > ngroups) |
4525 | groups = ngroups; | |
a02908f1 MC |
4526 | if (groups > EXT4_SB(inode->i_sb)->s_gdb_count) |
4527 | gdpblocks = EXT4_SB(inode->i_sb)->s_gdb_count; | |
4528 | ||
4529 | /* bitmaps and block group descriptor blocks */ | |
4530 | ret += groups + gdpblocks; | |
4531 | ||
4532 | /* Blocks for super block, inode, quota and xattr blocks */ | |
4533 | ret += EXT4_META_TRANS_BLOCKS(inode->i_sb); | |
4534 | ||
4535 | return ret; | |
4536 | } | |
4537 | ||
4538 | /* | |
25985edc | 4539 | * Calculate the total number of credits to reserve to fit |
f3bd1f3f MC |
4540 | * the modification of a single pages into a single transaction, |
4541 | * which may include multiple chunks of block allocations. | |
ac27a0ec | 4542 | * |
525f4ed8 | 4543 | * This could be called via ext4_write_begin() |
ac27a0ec | 4544 | * |
525f4ed8 | 4545 | * We need to consider the worse case, when |
a02908f1 | 4546 | * one new block per extent. |
ac27a0ec | 4547 | */ |
a86c6181 | 4548 | int ext4_writepage_trans_blocks(struct inode *inode) |
ac27a0ec | 4549 | { |
617ba13b | 4550 | int bpp = ext4_journal_blocks_per_page(inode); |
ac27a0ec DK |
4551 | int ret; |
4552 | ||
a02908f1 | 4553 | ret = ext4_meta_trans_blocks(inode, bpp, 0); |
a86c6181 | 4554 | |
a02908f1 | 4555 | /* Account for data blocks for journalled mode */ |
617ba13b | 4556 | if (ext4_should_journal_data(inode)) |
a02908f1 | 4557 | ret += bpp; |
ac27a0ec DK |
4558 | return ret; |
4559 | } | |
f3bd1f3f MC |
4560 | |
4561 | /* | |
4562 | * Calculate the journal credits for a chunk of data modification. | |
4563 | * | |
4564 | * This is called from DIO, fallocate or whoever calling | |
79e83036 | 4565 | * ext4_map_blocks() to map/allocate a chunk of contiguous disk blocks. |
f3bd1f3f MC |
4566 | * |
4567 | * journal buffers for data blocks are not included here, as DIO | |
4568 | * and fallocate do no need to journal data buffers. | |
4569 | */ | |
4570 | int ext4_chunk_trans_blocks(struct inode *inode, int nrblocks) | |
4571 | { | |
4572 | return ext4_meta_trans_blocks(inode, nrblocks, 1); | |
4573 | } | |
4574 | ||
ac27a0ec | 4575 | /* |
617ba13b | 4576 | * The caller must have previously called ext4_reserve_inode_write(). |
ac27a0ec DK |
4577 | * Give this, we know that the caller already has write access to iloc->bh. |
4578 | */ | |
617ba13b | 4579 | int ext4_mark_iloc_dirty(handle_t *handle, |
de9a55b8 | 4580 | struct inode *inode, struct ext4_iloc *iloc) |
ac27a0ec DK |
4581 | { |
4582 | int err = 0; | |
4583 | ||
c64db50e | 4584 | if (IS_I_VERSION(inode)) |
25ec56b5 JNC |
4585 | inode_inc_iversion(inode); |
4586 | ||
ac27a0ec DK |
4587 | /* the do_update_inode consumes one bh->b_count */ |
4588 | get_bh(iloc->bh); | |
4589 | ||
dab291af | 4590 | /* ext4_do_update_inode() does jbd2_journal_dirty_metadata */ |
830156c7 | 4591 | err = ext4_do_update_inode(handle, inode, iloc); |
ac27a0ec DK |
4592 | put_bh(iloc->bh); |
4593 | return err; | |
4594 | } | |
4595 | ||
4596 | /* | |
4597 | * On success, We end up with an outstanding reference count against | |
4598 | * iloc->bh. This _must_ be cleaned up later. | |
4599 | */ | |
4600 | ||
4601 | int | |
617ba13b MC |
4602 | ext4_reserve_inode_write(handle_t *handle, struct inode *inode, |
4603 | struct ext4_iloc *iloc) | |
ac27a0ec | 4604 | { |
0390131b FM |
4605 | int err; |
4606 | ||
4607 | err = ext4_get_inode_loc(inode, iloc); | |
4608 | if (!err) { | |
4609 | BUFFER_TRACE(iloc->bh, "get_write_access"); | |
4610 | err = ext4_journal_get_write_access(handle, iloc->bh); | |
4611 | if (err) { | |
4612 | brelse(iloc->bh); | |
4613 | iloc->bh = NULL; | |
ac27a0ec DK |
4614 | } |
4615 | } | |
617ba13b | 4616 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
4617 | return err; |
4618 | } | |
4619 | ||
6dd4ee7c KS |
4620 | /* |
4621 | * Expand an inode by new_extra_isize bytes. | |
4622 | * Returns 0 on success or negative error number on failure. | |
4623 | */ | |
1d03ec98 AK |
4624 | static int ext4_expand_extra_isize(struct inode *inode, |
4625 | unsigned int new_extra_isize, | |
4626 | struct ext4_iloc iloc, | |
4627 | handle_t *handle) | |
6dd4ee7c KS |
4628 | { |
4629 | struct ext4_inode *raw_inode; | |
4630 | struct ext4_xattr_ibody_header *header; | |
6dd4ee7c KS |
4631 | |
4632 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) | |
4633 | return 0; | |
4634 | ||
4635 | raw_inode = ext4_raw_inode(&iloc); | |
4636 | ||
4637 | header = IHDR(inode, raw_inode); | |
6dd4ee7c KS |
4638 | |
4639 | /* No extended attributes present */ | |
19f5fb7a TT |
4640 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR) || |
4641 | header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)) { | |
6dd4ee7c KS |
4642 | memset((void *)raw_inode + EXT4_GOOD_OLD_INODE_SIZE, 0, |
4643 | new_extra_isize); | |
4644 | EXT4_I(inode)->i_extra_isize = new_extra_isize; | |
4645 | return 0; | |
4646 | } | |
4647 | ||
4648 | /* try to expand with EAs present */ | |
4649 | return ext4_expand_extra_isize_ea(inode, new_extra_isize, | |
4650 | raw_inode, handle); | |
4651 | } | |
4652 | ||
ac27a0ec DK |
4653 | /* |
4654 | * What we do here is to mark the in-core inode as clean with respect to inode | |
4655 | * dirtiness (it may still be data-dirty). | |
4656 | * This means that the in-core inode may be reaped by prune_icache | |
4657 | * without having to perform any I/O. This is a very good thing, | |
4658 | * because *any* task may call prune_icache - even ones which | |
4659 | * have a transaction open against a different journal. | |
4660 | * | |
4661 | * Is this cheating? Not really. Sure, we haven't written the | |
4662 | * inode out, but prune_icache isn't a user-visible syncing function. | |
4663 | * Whenever the user wants stuff synced (sys_sync, sys_msync, sys_fsync) | |
4664 | * we start and wait on commits. | |
ac27a0ec | 4665 | */ |
617ba13b | 4666 | int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode) |
ac27a0ec | 4667 | { |
617ba13b | 4668 | struct ext4_iloc iloc; |
6dd4ee7c KS |
4669 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
4670 | static unsigned int mnt_count; | |
4671 | int err, ret; | |
ac27a0ec DK |
4672 | |
4673 | might_sleep(); | |
7ff9c073 | 4674 | trace_ext4_mark_inode_dirty(inode, _RET_IP_); |
617ba13b | 4675 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
0390131b FM |
4676 | if (ext4_handle_valid(handle) && |
4677 | EXT4_I(inode)->i_extra_isize < sbi->s_want_extra_isize && | |
19f5fb7a | 4678 | !ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND)) { |
6dd4ee7c KS |
4679 | /* |
4680 | * We need extra buffer credits since we may write into EA block | |
4681 | * with this same handle. If journal_extend fails, then it will | |
4682 | * only result in a minor loss of functionality for that inode. | |
4683 | * If this is felt to be critical, then e2fsck should be run to | |
4684 | * force a large enough s_min_extra_isize. | |
4685 | */ | |
4686 | if ((jbd2_journal_extend(handle, | |
4687 | EXT4_DATA_TRANS_BLOCKS(inode->i_sb))) == 0) { | |
4688 | ret = ext4_expand_extra_isize(inode, | |
4689 | sbi->s_want_extra_isize, | |
4690 | iloc, handle); | |
4691 | if (ret) { | |
19f5fb7a TT |
4692 | ext4_set_inode_state(inode, |
4693 | EXT4_STATE_NO_EXPAND); | |
c1bddad9 AK |
4694 | if (mnt_count != |
4695 | le16_to_cpu(sbi->s_es->s_mnt_count)) { | |
12062ddd | 4696 | ext4_warning(inode->i_sb, |
6dd4ee7c KS |
4697 | "Unable to expand inode %lu. Delete" |
4698 | " some EAs or run e2fsck.", | |
4699 | inode->i_ino); | |
c1bddad9 AK |
4700 | mnt_count = |
4701 | le16_to_cpu(sbi->s_es->s_mnt_count); | |
6dd4ee7c KS |
4702 | } |
4703 | } | |
4704 | } | |
4705 | } | |
ac27a0ec | 4706 | if (!err) |
617ba13b | 4707 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec DK |
4708 | return err; |
4709 | } | |
4710 | ||
4711 | /* | |
617ba13b | 4712 | * ext4_dirty_inode() is called from __mark_inode_dirty() |
ac27a0ec DK |
4713 | * |
4714 | * We're really interested in the case where a file is being extended. | |
4715 | * i_size has been changed by generic_commit_write() and we thus need | |
4716 | * to include the updated inode in the current transaction. | |
4717 | * | |
5dd4056d | 4718 | * Also, dquot_alloc_block() will always dirty the inode when blocks |
ac27a0ec DK |
4719 | * are allocated to the file. |
4720 | * | |
4721 | * If the inode is marked synchronous, we don't honour that here - doing | |
4722 | * so would cause a commit on atime updates, which we don't bother doing. | |
4723 | * We handle synchronous inodes at the highest possible level. | |
4724 | */ | |
aa385729 | 4725 | void ext4_dirty_inode(struct inode *inode, int flags) |
ac27a0ec | 4726 | { |
ac27a0ec DK |
4727 | handle_t *handle; |
4728 | ||
9924a92a | 4729 | handle = ext4_journal_start(inode, EXT4_HT_INODE, 2); |
ac27a0ec DK |
4730 | if (IS_ERR(handle)) |
4731 | goto out; | |
f3dc272f | 4732 | |
f3dc272f CW |
4733 | ext4_mark_inode_dirty(handle, inode); |
4734 | ||
617ba13b | 4735 | ext4_journal_stop(handle); |
ac27a0ec DK |
4736 | out: |
4737 | return; | |
4738 | } | |
4739 | ||
4740 | #if 0 | |
4741 | /* | |
4742 | * Bind an inode's backing buffer_head into this transaction, to prevent | |
4743 | * it from being flushed to disk early. Unlike | |
617ba13b | 4744 | * ext4_reserve_inode_write, this leaves behind no bh reference and |
ac27a0ec DK |
4745 | * returns no iloc structure, so the caller needs to repeat the iloc |
4746 | * lookup to mark the inode dirty later. | |
4747 | */ | |
617ba13b | 4748 | static int ext4_pin_inode(handle_t *handle, struct inode *inode) |
ac27a0ec | 4749 | { |
617ba13b | 4750 | struct ext4_iloc iloc; |
ac27a0ec DK |
4751 | |
4752 | int err = 0; | |
4753 | if (handle) { | |
617ba13b | 4754 | err = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
4755 | if (!err) { |
4756 | BUFFER_TRACE(iloc.bh, "get_write_access"); | |
dab291af | 4757 | err = jbd2_journal_get_write_access(handle, iloc.bh); |
ac27a0ec | 4758 | if (!err) |
0390131b | 4759 | err = ext4_handle_dirty_metadata(handle, |
73b50c1c | 4760 | NULL, |
0390131b | 4761 | iloc.bh); |
ac27a0ec DK |
4762 | brelse(iloc.bh); |
4763 | } | |
4764 | } | |
617ba13b | 4765 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
4766 | return err; |
4767 | } | |
4768 | #endif | |
4769 | ||
617ba13b | 4770 | int ext4_change_inode_journal_flag(struct inode *inode, int val) |
ac27a0ec DK |
4771 | { |
4772 | journal_t *journal; | |
4773 | handle_t *handle; | |
4774 | int err; | |
4775 | ||
4776 | /* | |
4777 | * We have to be very careful here: changing a data block's | |
4778 | * journaling status dynamically is dangerous. If we write a | |
4779 | * data block to the journal, change the status and then delete | |
4780 | * that block, we risk forgetting to revoke the old log record | |
4781 | * from the journal and so a subsequent replay can corrupt data. | |
4782 | * So, first we make sure that the journal is empty and that | |
4783 | * nobody is changing anything. | |
4784 | */ | |
4785 | ||
617ba13b | 4786 | journal = EXT4_JOURNAL(inode); |
0390131b FM |
4787 | if (!journal) |
4788 | return 0; | |
d699594d | 4789 | if (is_journal_aborted(journal)) |
ac27a0ec | 4790 | return -EROFS; |
2aff57b0 YY |
4791 | /* We have to allocate physical blocks for delalloc blocks |
4792 | * before flushing journal. otherwise delalloc blocks can not | |
4793 | * be allocated any more. even more truncate on delalloc blocks | |
4794 | * could trigger BUG by flushing delalloc blocks in journal. | |
4795 | * There is no delalloc block in non-journal data mode. | |
4796 | */ | |
4797 | if (val && test_opt(inode->i_sb, DELALLOC)) { | |
4798 | err = ext4_alloc_da_blocks(inode); | |
4799 | if (err < 0) | |
4800 | return err; | |
4801 | } | |
ac27a0ec | 4802 | |
17335dcc DM |
4803 | /* Wait for all existing dio workers */ |
4804 | ext4_inode_block_unlocked_dio(inode); | |
4805 | inode_dio_wait(inode); | |
4806 | ||
dab291af | 4807 | jbd2_journal_lock_updates(journal); |
ac27a0ec DK |
4808 | |
4809 | /* | |
4810 | * OK, there are no updates running now, and all cached data is | |
4811 | * synced to disk. We are now in a completely consistent state | |
4812 | * which doesn't have anything in the journal, and we know that | |
4813 | * no filesystem updates are running, so it is safe to modify | |
4814 | * the inode's in-core data-journaling state flag now. | |
4815 | */ | |
4816 | ||
4817 | if (val) | |
12e9b892 | 4818 | ext4_set_inode_flag(inode, EXT4_INODE_JOURNAL_DATA); |
5872ddaa YY |
4819 | else { |
4820 | jbd2_journal_flush(journal); | |
12e9b892 | 4821 | ext4_clear_inode_flag(inode, EXT4_INODE_JOURNAL_DATA); |
5872ddaa | 4822 | } |
617ba13b | 4823 | ext4_set_aops(inode); |
ac27a0ec | 4824 | |
dab291af | 4825 | jbd2_journal_unlock_updates(journal); |
17335dcc | 4826 | ext4_inode_resume_unlocked_dio(inode); |
ac27a0ec DK |
4827 | |
4828 | /* Finally we can mark the inode as dirty. */ | |
4829 | ||
9924a92a | 4830 | handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); |
ac27a0ec DK |
4831 | if (IS_ERR(handle)) |
4832 | return PTR_ERR(handle); | |
4833 | ||
617ba13b | 4834 | err = ext4_mark_inode_dirty(handle, inode); |
0390131b | 4835 | ext4_handle_sync(handle); |
617ba13b MC |
4836 | ext4_journal_stop(handle); |
4837 | ext4_std_error(inode->i_sb, err); | |
ac27a0ec DK |
4838 | |
4839 | return err; | |
4840 | } | |
2e9ee850 AK |
4841 | |
4842 | static int ext4_bh_unmapped(handle_t *handle, struct buffer_head *bh) | |
4843 | { | |
4844 | return !buffer_mapped(bh); | |
4845 | } | |
4846 | ||
c2ec175c | 4847 | int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
2e9ee850 | 4848 | { |
c2ec175c | 4849 | struct page *page = vmf->page; |
2e9ee850 AK |
4850 | loff_t size; |
4851 | unsigned long len; | |
9ea7df53 | 4852 | int ret; |
2e9ee850 | 4853 | struct file *file = vma->vm_file; |
496ad9aa | 4854 | struct inode *inode = file_inode(file); |
2e9ee850 | 4855 | struct address_space *mapping = inode->i_mapping; |
9ea7df53 JK |
4856 | handle_t *handle; |
4857 | get_block_t *get_block; | |
4858 | int retries = 0; | |
2e9ee850 | 4859 | |
8e8ad8a5 | 4860 | sb_start_pagefault(inode->i_sb); |
041bbb6d | 4861 | file_update_time(vma->vm_file); |
9ea7df53 JK |
4862 | /* Delalloc case is easy... */ |
4863 | if (test_opt(inode->i_sb, DELALLOC) && | |
4864 | !ext4_should_journal_data(inode) && | |
4865 | !ext4_nonda_switch(inode->i_sb)) { | |
4866 | do { | |
4867 | ret = __block_page_mkwrite(vma, vmf, | |
4868 | ext4_da_get_block_prep); | |
4869 | } while (ret == -ENOSPC && | |
4870 | ext4_should_retry_alloc(inode->i_sb, &retries)); | |
4871 | goto out_ret; | |
2e9ee850 | 4872 | } |
0e499890 DW |
4873 | |
4874 | lock_page(page); | |
9ea7df53 JK |
4875 | size = i_size_read(inode); |
4876 | /* Page got truncated from under us? */ | |
4877 | if (page->mapping != mapping || page_offset(page) > size) { | |
4878 | unlock_page(page); | |
4879 | ret = VM_FAULT_NOPAGE; | |
4880 | goto out; | |
0e499890 | 4881 | } |
2e9ee850 AK |
4882 | |
4883 | if (page->index == size >> PAGE_CACHE_SHIFT) | |
4884 | len = size & ~PAGE_CACHE_MASK; | |
4885 | else | |
4886 | len = PAGE_CACHE_SIZE; | |
a827eaff | 4887 | /* |
9ea7df53 JK |
4888 | * Return if we have all the buffers mapped. This avoids the need to do |
4889 | * journal_start/journal_stop which can block and take a long time | |
a827eaff | 4890 | */ |
2e9ee850 | 4891 | if (page_has_buffers(page)) { |
f19d5870 TM |
4892 | if (!ext4_walk_page_buffers(NULL, page_buffers(page), |
4893 | 0, len, NULL, | |
4894 | ext4_bh_unmapped)) { | |
9ea7df53 | 4895 | /* Wait so that we don't change page under IO */ |
1d1d1a76 | 4896 | wait_for_stable_page(page); |
9ea7df53 JK |
4897 | ret = VM_FAULT_LOCKED; |
4898 | goto out; | |
a827eaff | 4899 | } |
2e9ee850 | 4900 | } |
a827eaff | 4901 | unlock_page(page); |
9ea7df53 JK |
4902 | /* OK, we need to fill the hole... */ |
4903 | if (ext4_should_dioread_nolock(inode)) | |
4904 | get_block = ext4_get_block_write; | |
4905 | else | |
4906 | get_block = ext4_get_block; | |
4907 | retry_alloc: | |
9924a92a TT |
4908 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, |
4909 | ext4_writepage_trans_blocks(inode)); | |
9ea7df53 | 4910 | if (IS_ERR(handle)) { |
c2ec175c | 4911 | ret = VM_FAULT_SIGBUS; |
9ea7df53 JK |
4912 | goto out; |
4913 | } | |
4914 | ret = __block_page_mkwrite(vma, vmf, get_block); | |
4915 | if (!ret && ext4_should_journal_data(inode)) { | |
f19d5870 | 4916 | if (ext4_walk_page_buffers(handle, page_buffers(page), 0, |
9ea7df53 JK |
4917 | PAGE_CACHE_SIZE, NULL, do_journal_get_write_access)) { |
4918 | unlock_page(page); | |
4919 | ret = VM_FAULT_SIGBUS; | |
fcbb5515 | 4920 | ext4_journal_stop(handle); |
9ea7df53 JK |
4921 | goto out; |
4922 | } | |
4923 | ext4_set_inode_state(inode, EXT4_STATE_JDATA); | |
4924 | } | |
4925 | ext4_journal_stop(handle); | |
4926 | if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) | |
4927 | goto retry_alloc; | |
4928 | out_ret: | |
4929 | ret = block_page_mkwrite_return(ret); | |
4930 | out: | |
8e8ad8a5 | 4931 | sb_end_pagefault(inode->i_sb); |
2e9ee850 AK |
4932 | return ret; |
4933 | } |