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 noalloc_get_block_write(struct inode *inode, sector_t iblock, |
136 | struct buffer_head *bh_result, int create); | |
137 | static int ext4_set_bh_endio(struct buffer_head *bh, struct inode *inode); | |
138 | static void ext4_end_io_buffer_write(struct buffer_head *bh, int uptodate); | |
139 | static int __ext4_journalled_writepage(struct page *page, unsigned int len); | |
140 | static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh); | |
5f163cc7 ES |
141 | static int ext4_discard_partial_page_buffers_no_lock(handle_t *handle, |
142 | struct inode *inode, struct page *page, loff_t from, | |
143 | loff_t length, int flags); | |
64769240 | 144 | |
ac27a0ec DK |
145 | /* |
146 | * Test whether an inode is a fast symlink. | |
147 | */ | |
617ba13b | 148 | static int ext4_inode_is_fast_symlink(struct inode *inode) |
ac27a0ec | 149 | { |
617ba13b | 150 | int ea_blocks = EXT4_I(inode)->i_file_acl ? |
ac27a0ec DK |
151 | (inode->i_sb->s_blocksize >> 9) : 0; |
152 | ||
153 | return (S_ISLNK(inode->i_mode) && inode->i_blocks - ea_blocks == 0); | |
154 | } | |
155 | ||
ac27a0ec DK |
156 | /* |
157 | * Restart the transaction associated with *handle. This does a commit, | |
158 | * so before we call here everything must be consistently dirtied against | |
159 | * this transaction. | |
160 | */ | |
fa5d1113 | 161 | int ext4_truncate_restart_trans(handle_t *handle, struct inode *inode, |
487caeef | 162 | int nblocks) |
ac27a0ec | 163 | { |
487caeef JK |
164 | int ret; |
165 | ||
166 | /* | |
e35fd660 | 167 | * Drop i_data_sem to avoid deadlock with ext4_map_blocks. At this |
487caeef JK |
168 | * moment, get_block can be called only for blocks inside i_size since |
169 | * page cache has been already dropped and writes are blocked by | |
170 | * i_mutex. So we can safely drop the i_data_sem here. | |
171 | */ | |
0390131b | 172 | BUG_ON(EXT4_JOURNAL(inode) == NULL); |
ac27a0ec | 173 | jbd_debug(2, "restarting handle %p\n", handle); |
487caeef | 174 | up_write(&EXT4_I(inode)->i_data_sem); |
8e8eaabe | 175 | ret = ext4_journal_restart(handle, nblocks); |
487caeef | 176 | down_write(&EXT4_I(inode)->i_data_sem); |
fa5d1113 | 177 | ext4_discard_preallocations(inode); |
487caeef JK |
178 | |
179 | return ret; | |
ac27a0ec DK |
180 | } |
181 | ||
182 | /* | |
183 | * Called at the last iput() if i_nlink is zero. | |
184 | */ | |
0930fcc1 | 185 | void ext4_evict_inode(struct inode *inode) |
ac27a0ec DK |
186 | { |
187 | handle_t *handle; | |
bc965ab3 | 188 | int err; |
ac27a0ec | 189 | |
7ff9c073 | 190 | trace_ext4_evict_inode(inode); |
2581fdc8 | 191 | |
2581fdc8 JZ |
192 | ext4_ioend_wait(inode); |
193 | ||
0930fcc1 | 194 | if (inode->i_nlink) { |
2d859db3 JK |
195 | /* |
196 | * When journalling data dirty buffers are tracked only in the | |
197 | * journal. So although mm thinks everything is clean and | |
198 | * ready for reaping the inode might still have some pages to | |
199 | * write in the running transaction or waiting to be | |
200 | * checkpointed. Thus calling jbd2_journal_invalidatepage() | |
201 | * (via truncate_inode_pages()) to discard these buffers can | |
202 | * cause data loss. Also even if we did not discard these | |
203 | * buffers, we would have no way to find them after the inode | |
204 | * is reaped and thus user could see stale data if he tries to | |
205 | * read them before the transaction is checkpointed. So be | |
206 | * careful and force everything to disk here... We use | |
207 | * ei->i_datasync_tid to store the newest transaction | |
208 | * containing inode's data. | |
209 | * | |
210 | * Note that directories do not have this problem because they | |
211 | * don't use page cache. | |
212 | */ | |
213 | if (ext4_should_journal_data(inode) && | |
214 | (S_ISLNK(inode->i_mode) || S_ISREG(inode->i_mode))) { | |
215 | journal_t *journal = EXT4_SB(inode->i_sb)->s_journal; | |
216 | tid_t commit_tid = EXT4_I(inode)->i_datasync_tid; | |
217 | ||
218 | jbd2_log_start_commit(journal, commit_tid); | |
219 | jbd2_log_wait_commit(journal, commit_tid); | |
220 | filemap_write_and_wait(&inode->i_data); | |
221 | } | |
0930fcc1 AV |
222 | truncate_inode_pages(&inode->i_data, 0); |
223 | goto no_delete; | |
224 | } | |
225 | ||
907f4554 | 226 | if (!is_bad_inode(inode)) |
871a2931 | 227 | dquot_initialize(inode); |
907f4554 | 228 | |
678aaf48 JK |
229 | if (ext4_should_order_data(inode)) |
230 | ext4_begin_ordered_truncate(inode, 0); | |
ac27a0ec DK |
231 | truncate_inode_pages(&inode->i_data, 0); |
232 | ||
233 | if (is_bad_inode(inode)) | |
234 | goto no_delete; | |
235 | ||
8e8ad8a5 JK |
236 | /* |
237 | * Protect us against freezing - iput() caller didn't have to have any | |
238 | * protection against it | |
239 | */ | |
240 | sb_start_intwrite(inode->i_sb); | |
9f125d64 | 241 | handle = ext4_journal_start(inode, ext4_blocks_for_truncate(inode)+3); |
ac27a0ec | 242 | if (IS_ERR(handle)) { |
bc965ab3 | 243 | ext4_std_error(inode->i_sb, PTR_ERR(handle)); |
ac27a0ec DK |
244 | /* |
245 | * If we're going to skip the normal cleanup, we still need to | |
246 | * make sure that the in-core orphan linked list is properly | |
247 | * cleaned up. | |
248 | */ | |
617ba13b | 249 | ext4_orphan_del(NULL, inode); |
8e8ad8a5 | 250 | sb_end_intwrite(inode->i_sb); |
ac27a0ec DK |
251 | goto no_delete; |
252 | } | |
253 | ||
254 | if (IS_SYNC(inode)) | |
0390131b | 255 | ext4_handle_sync(handle); |
ac27a0ec | 256 | inode->i_size = 0; |
bc965ab3 TT |
257 | err = ext4_mark_inode_dirty(handle, inode); |
258 | if (err) { | |
12062ddd | 259 | ext4_warning(inode->i_sb, |
bc965ab3 TT |
260 | "couldn't mark inode dirty (err %d)", err); |
261 | goto stop_handle; | |
262 | } | |
ac27a0ec | 263 | if (inode->i_blocks) |
617ba13b | 264 | ext4_truncate(inode); |
bc965ab3 TT |
265 | |
266 | /* | |
267 | * ext4_ext_truncate() doesn't reserve any slop when it | |
268 | * restarts journal transactions; therefore there may not be | |
269 | * enough credits left in the handle to remove the inode from | |
270 | * the orphan list and set the dtime field. | |
271 | */ | |
0390131b | 272 | if (!ext4_handle_has_enough_credits(handle, 3)) { |
bc965ab3 TT |
273 | err = ext4_journal_extend(handle, 3); |
274 | if (err > 0) | |
275 | err = ext4_journal_restart(handle, 3); | |
276 | if (err != 0) { | |
12062ddd | 277 | ext4_warning(inode->i_sb, |
bc965ab3 TT |
278 | "couldn't extend journal (err %d)", err); |
279 | stop_handle: | |
280 | ext4_journal_stop(handle); | |
45388219 | 281 | ext4_orphan_del(NULL, inode); |
8e8ad8a5 | 282 | sb_end_intwrite(inode->i_sb); |
bc965ab3 TT |
283 | goto no_delete; |
284 | } | |
285 | } | |
286 | ||
ac27a0ec | 287 | /* |
617ba13b | 288 | * Kill off the orphan record which ext4_truncate created. |
ac27a0ec | 289 | * AKPM: I think this can be inside the above `if'. |
617ba13b | 290 | * Note that ext4_orphan_del() has to be able to cope with the |
ac27a0ec | 291 | * deletion of a non-existent orphan - this is because we don't |
617ba13b | 292 | * know if ext4_truncate() actually created an orphan record. |
ac27a0ec DK |
293 | * (Well, we could do this if we need to, but heck - it works) |
294 | */ | |
617ba13b MC |
295 | ext4_orphan_del(handle, inode); |
296 | EXT4_I(inode)->i_dtime = get_seconds(); | |
ac27a0ec DK |
297 | |
298 | /* | |
299 | * One subtle ordering requirement: if anything has gone wrong | |
300 | * (transaction abort, IO errors, whatever), then we can still | |
301 | * do these next steps (the fs will already have been marked as | |
302 | * having errors), but we can't free the inode if the mark_dirty | |
303 | * fails. | |
304 | */ | |
617ba13b | 305 | if (ext4_mark_inode_dirty(handle, inode)) |
ac27a0ec | 306 | /* If that failed, just do the required in-core inode clear. */ |
0930fcc1 | 307 | ext4_clear_inode(inode); |
ac27a0ec | 308 | else |
617ba13b MC |
309 | ext4_free_inode(handle, inode); |
310 | ext4_journal_stop(handle); | |
8e8ad8a5 | 311 | sb_end_intwrite(inode->i_sb); |
ac27a0ec DK |
312 | return; |
313 | no_delete: | |
0930fcc1 | 314 | ext4_clear_inode(inode); /* We must guarantee clearing of inode... */ |
ac27a0ec DK |
315 | } |
316 | ||
a9e7f447 DM |
317 | #ifdef CONFIG_QUOTA |
318 | qsize_t *ext4_get_reserved_space(struct inode *inode) | |
60e58e0f | 319 | { |
a9e7f447 | 320 | return &EXT4_I(inode)->i_reserved_quota; |
60e58e0f | 321 | } |
a9e7f447 | 322 | #endif |
9d0be502 | 323 | |
12219aea AK |
324 | /* |
325 | * Calculate the number of metadata blocks need to reserve | |
9d0be502 | 326 | * to allocate a block located at @lblock |
12219aea | 327 | */ |
01f49d0b | 328 | static int ext4_calc_metadata_amount(struct inode *inode, ext4_lblk_t lblock) |
12219aea | 329 | { |
12e9b892 | 330 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
9d0be502 | 331 | return ext4_ext_calc_metadata_amount(inode, lblock); |
12219aea | 332 | |
8bb2b247 | 333 | return ext4_ind_calc_metadata_amount(inode, lblock); |
12219aea AK |
334 | } |
335 | ||
0637c6f4 TT |
336 | /* |
337 | * Called with i_data_sem down, which is important since we can call | |
338 | * ext4_discard_preallocations() from here. | |
339 | */ | |
5f634d06 AK |
340 | void ext4_da_update_reserve_space(struct inode *inode, |
341 | int used, int quota_claim) | |
12219aea AK |
342 | { |
343 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
0637c6f4 | 344 | struct ext4_inode_info *ei = EXT4_I(inode); |
0637c6f4 TT |
345 | |
346 | spin_lock(&ei->i_block_reservation_lock); | |
d8990240 | 347 | trace_ext4_da_update_reserve_space(inode, used, quota_claim); |
0637c6f4 TT |
348 | if (unlikely(used > ei->i_reserved_data_blocks)) { |
349 | ext4_msg(inode->i_sb, KERN_NOTICE, "%s: ino %lu, used %d " | |
1084f252 | 350 | "with only %d reserved data blocks", |
0637c6f4 TT |
351 | __func__, inode->i_ino, used, |
352 | ei->i_reserved_data_blocks); | |
353 | WARN_ON(1); | |
354 | used = ei->i_reserved_data_blocks; | |
355 | } | |
12219aea | 356 | |
97795d2a BF |
357 | if (unlikely(ei->i_allocated_meta_blocks > ei->i_reserved_meta_blocks)) { |
358 | ext4_msg(inode->i_sb, KERN_NOTICE, "%s: ino %lu, allocated %d " | |
359 | "with only %d reserved metadata blocks\n", __func__, | |
360 | inode->i_ino, ei->i_allocated_meta_blocks, | |
361 | ei->i_reserved_meta_blocks); | |
362 | WARN_ON(1); | |
363 | ei->i_allocated_meta_blocks = ei->i_reserved_meta_blocks; | |
364 | } | |
365 | ||
0637c6f4 TT |
366 | /* Update per-inode reservations */ |
367 | ei->i_reserved_data_blocks -= used; | |
0637c6f4 | 368 | ei->i_reserved_meta_blocks -= ei->i_allocated_meta_blocks; |
57042651 | 369 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, |
72b8ab9d | 370 | used + ei->i_allocated_meta_blocks); |
0637c6f4 | 371 | ei->i_allocated_meta_blocks = 0; |
6bc6e63f | 372 | |
0637c6f4 TT |
373 | if (ei->i_reserved_data_blocks == 0) { |
374 | /* | |
375 | * We can release all of the reserved metadata blocks | |
376 | * only when we have written all of the delayed | |
377 | * allocation blocks. | |
378 | */ | |
57042651 | 379 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, |
72b8ab9d | 380 | ei->i_reserved_meta_blocks); |
ee5f4d9c | 381 | ei->i_reserved_meta_blocks = 0; |
9d0be502 | 382 | ei->i_da_metadata_calc_len = 0; |
6bc6e63f | 383 | } |
12219aea | 384 | spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); |
60e58e0f | 385 | |
72b8ab9d ES |
386 | /* Update quota subsystem for data blocks */ |
387 | if (quota_claim) | |
7b415bf6 | 388 | dquot_claim_block(inode, EXT4_C2B(sbi, used)); |
72b8ab9d | 389 | else { |
5f634d06 AK |
390 | /* |
391 | * We did fallocate with an offset that is already delayed | |
392 | * allocated. So on delayed allocated writeback we should | |
72b8ab9d | 393 | * not re-claim the quota for fallocated blocks. |
5f634d06 | 394 | */ |
7b415bf6 | 395 | dquot_release_reservation_block(inode, EXT4_C2B(sbi, used)); |
5f634d06 | 396 | } |
d6014301 AK |
397 | |
398 | /* | |
399 | * If we have done all the pending block allocations and if | |
400 | * there aren't any writers on the inode, we can discard the | |
401 | * inode's preallocations. | |
402 | */ | |
0637c6f4 TT |
403 | if ((ei->i_reserved_data_blocks == 0) && |
404 | (atomic_read(&inode->i_writecount) == 0)) | |
d6014301 | 405 | ext4_discard_preallocations(inode); |
12219aea AK |
406 | } |
407 | ||
e29136f8 | 408 | static int __check_block_validity(struct inode *inode, const char *func, |
c398eda0 TT |
409 | unsigned int line, |
410 | struct ext4_map_blocks *map) | |
6fd058f7 | 411 | { |
24676da4 TT |
412 | if (!ext4_data_block_valid(EXT4_SB(inode->i_sb), map->m_pblk, |
413 | map->m_len)) { | |
c398eda0 TT |
414 | ext4_error_inode(inode, func, line, map->m_pblk, |
415 | "lblock %lu mapped to illegal pblock " | |
416 | "(length %d)", (unsigned long) map->m_lblk, | |
417 | map->m_len); | |
6fd058f7 TT |
418 | return -EIO; |
419 | } | |
420 | return 0; | |
421 | } | |
422 | ||
e29136f8 | 423 | #define check_block_validity(inode, map) \ |
c398eda0 | 424 | __check_block_validity((inode), __func__, __LINE__, (map)) |
e29136f8 | 425 | |
55138e0b | 426 | /* |
1f94533d TT |
427 | * Return the number of contiguous dirty pages in a given inode |
428 | * starting at page frame idx. | |
55138e0b TT |
429 | */ |
430 | static pgoff_t ext4_num_dirty_pages(struct inode *inode, pgoff_t idx, | |
431 | unsigned int max_pages) | |
432 | { | |
433 | struct address_space *mapping = inode->i_mapping; | |
434 | pgoff_t index; | |
435 | struct pagevec pvec; | |
436 | pgoff_t num = 0; | |
437 | int i, nr_pages, done = 0; | |
438 | ||
439 | if (max_pages == 0) | |
440 | return 0; | |
441 | pagevec_init(&pvec, 0); | |
442 | while (!done) { | |
443 | index = idx; | |
444 | nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
445 | PAGECACHE_TAG_DIRTY, | |
446 | (pgoff_t)PAGEVEC_SIZE); | |
447 | if (nr_pages == 0) | |
448 | break; | |
449 | for (i = 0; i < nr_pages; i++) { | |
450 | struct page *page = pvec.pages[i]; | |
451 | struct buffer_head *bh, *head; | |
452 | ||
453 | lock_page(page); | |
454 | if (unlikely(page->mapping != mapping) || | |
455 | !PageDirty(page) || | |
456 | PageWriteback(page) || | |
457 | page->index != idx) { | |
458 | done = 1; | |
459 | unlock_page(page); | |
460 | break; | |
461 | } | |
1f94533d TT |
462 | if (page_has_buffers(page)) { |
463 | bh = head = page_buffers(page); | |
464 | do { | |
465 | if (!buffer_delay(bh) && | |
466 | !buffer_unwritten(bh)) | |
467 | done = 1; | |
468 | bh = bh->b_this_page; | |
469 | } while (!done && (bh != head)); | |
470 | } | |
55138e0b TT |
471 | unlock_page(page); |
472 | if (done) | |
473 | break; | |
474 | idx++; | |
475 | num++; | |
659c6009 ES |
476 | if (num >= max_pages) { |
477 | done = 1; | |
55138e0b | 478 | break; |
659c6009 | 479 | } |
55138e0b TT |
480 | } |
481 | pagevec_release(&pvec); | |
482 | } | |
483 | return num; | |
484 | } | |
485 | ||
f5ab0d1f | 486 | /* |
e35fd660 | 487 | * The ext4_map_blocks() function tries to look up the requested blocks, |
2b2d6d01 | 488 | * and returns if the blocks are already mapped. |
f5ab0d1f | 489 | * |
f5ab0d1f MC |
490 | * Otherwise it takes the write lock of the i_data_sem and allocate blocks |
491 | * and store the allocated blocks in the result buffer head and mark it | |
492 | * mapped. | |
493 | * | |
e35fd660 TT |
494 | * If file type is extents based, it will call ext4_ext_map_blocks(), |
495 | * Otherwise, call with ext4_ind_map_blocks() to handle indirect mapping | |
f5ab0d1f MC |
496 | * based files |
497 | * | |
498 | * On success, it returns the number of blocks being mapped or allocate. | |
499 | * if create==0 and the blocks are pre-allocated and uninitialized block, | |
500 | * the result buffer head is unmapped. If the create ==1, it will make sure | |
501 | * the buffer head is mapped. | |
502 | * | |
503 | * It returns 0 if plain look up failed (blocks have not been allocated), in | |
df3ab170 | 504 | * that case, buffer head is unmapped |
f5ab0d1f MC |
505 | * |
506 | * It returns the error in case of allocation failure. | |
507 | */ | |
e35fd660 TT |
508 | int ext4_map_blocks(handle_t *handle, struct inode *inode, |
509 | struct ext4_map_blocks *map, int flags) | |
0e855ac8 AK |
510 | { |
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); | |
4df3d265 | 517 | /* |
b920c755 TT |
518 | * Try to see if we can get the block without requesting a new |
519 | * file system block. | |
4df3d265 | 520 | */ |
729f52c6 ZL |
521 | if (!(flags & EXT4_GET_BLOCKS_NO_LOCK)) |
522 | down_read((&EXT4_I(inode)->i_data_sem)); | |
12e9b892 | 523 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { |
a4e5d88b DM |
524 | retval = ext4_ext_map_blocks(handle, inode, map, flags & |
525 | EXT4_GET_BLOCKS_KEEP_SIZE); | |
0e855ac8 | 526 | } else { |
a4e5d88b DM |
527 | retval = ext4_ind_map_blocks(handle, inode, map, flags & |
528 | EXT4_GET_BLOCKS_KEEP_SIZE); | |
0e855ac8 | 529 | } |
729f52c6 ZL |
530 | if (!(flags & EXT4_GET_BLOCKS_NO_LOCK)) |
531 | up_read((&EXT4_I(inode)->i_data_sem)); | |
f5ab0d1f | 532 | |
e35fd660 | 533 | if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) { |
51865fda ZL |
534 | int ret; |
535 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) { | |
536 | /* delayed alloc may be allocated by fallocate and | |
537 | * coverted to initialized by directIO. | |
538 | * we need to handle delayed extent here. | |
539 | */ | |
540 | down_write((&EXT4_I(inode)->i_data_sem)); | |
541 | goto delayed_mapped; | |
542 | } | |
543 | ret = check_block_validity(inode, map); | |
6fd058f7 TT |
544 | if (ret != 0) |
545 | return ret; | |
546 | } | |
547 | ||
f5ab0d1f | 548 | /* If it is only a block(s) look up */ |
c2177057 | 549 | if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) |
f5ab0d1f MC |
550 | return retval; |
551 | ||
552 | /* | |
553 | * Returns if the blocks have already allocated | |
554 | * | |
555 | * Note that if blocks have been preallocated | |
df3ab170 | 556 | * ext4_ext_get_block() returns the create = 0 |
f5ab0d1f MC |
557 | * with buffer head unmapped. |
558 | */ | |
e35fd660 | 559 | if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) |
4df3d265 AK |
560 | return retval; |
561 | ||
2a8964d6 AK |
562 | /* |
563 | * When we call get_blocks without the create flag, the | |
564 | * BH_Unwritten flag could have gotten set if the blocks | |
565 | * requested were part of a uninitialized extent. We need to | |
566 | * clear this flag now that we are committed to convert all or | |
567 | * part of the uninitialized extent to be an initialized | |
568 | * extent. This is because we need to avoid the combination | |
569 | * of BH_Unwritten and BH_Mapped flags being simultaneously | |
570 | * set on the buffer_head. | |
571 | */ | |
e35fd660 | 572 | map->m_flags &= ~EXT4_MAP_UNWRITTEN; |
2a8964d6 | 573 | |
4df3d265 | 574 | /* |
f5ab0d1f MC |
575 | * New blocks allocate and/or writing to uninitialized extent |
576 | * will possibly result in updating i_data, so we take | |
577 | * the write lock of i_data_sem, and call get_blocks() | |
578 | * with create == 1 flag. | |
4df3d265 AK |
579 | */ |
580 | down_write((&EXT4_I(inode)->i_data_sem)); | |
d2a17637 MC |
581 | |
582 | /* | |
583 | * if the caller is from delayed allocation writeout path | |
584 | * we have already reserved fs blocks for allocation | |
585 | * let the underlying get_block() function know to | |
586 | * avoid double accounting | |
587 | */ | |
c2177057 | 588 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) |
f2321097 | 589 | ext4_set_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED); |
4df3d265 AK |
590 | /* |
591 | * We need to check for EXT4 here because migrate | |
592 | * could have changed the inode type in between | |
593 | */ | |
12e9b892 | 594 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { |
e35fd660 | 595 | retval = ext4_ext_map_blocks(handle, inode, map, flags); |
0e855ac8 | 596 | } else { |
e35fd660 | 597 | retval = ext4_ind_map_blocks(handle, inode, map, flags); |
267e4db9 | 598 | |
e35fd660 | 599 | if (retval > 0 && map->m_flags & EXT4_MAP_NEW) { |
267e4db9 AK |
600 | /* |
601 | * We allocated new blocks which will result in | |
602 | * i_data's format changing. Force the migrate | |
603 | * to fail by clearing migrate flags | |
604 | */ | |
19f5fb7a | 605 | ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE); |
267e4db9 | 606 | } |
d2a17637 | 607 | |
5f634d06 AK |
608 | /* |
609 | * Update reserved blocks/metadata blocks after successful | |
610 | * block allocation which had been deferred till now. We don't | |
611 | * support fallocate for non extent files. So we can update | |
612 | * reserve space here. | |
613 | */ | |
614 | if ((retval > 0) && | |
1296cc85 | 615 | (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)) |
5f634d06 AK |
616 | ext4_da_update_reserve_space(inode, retval, 1); |
617 | } | |
5356f261 | 618 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) { |
f2321097 | 619 | ext4_clear_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED); |
2ac3b6e0 | 620 | |
51865fda ZL |
621 | if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) { |
622 | int ret; | |
51865fda ZL |
623 | delayed_mapped: |
624 | /* delayed allocation blocks has been allocated */ | |
625 | ret = ext4_es_remove_extent(inode, map->m_lblk, | |
626 | map->m_len); | |
627 | if (ret < 0) | |
628 | retval = ret; | |
629 | } | |
5356f261 AK |
630 | } |
631 | ||
4df3d265 | 632 | up_write((&EXT4_I(inode)->i_data_sem)); |
e35fd660 | 633 | if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) { |
e29136f8 | 634 | int ret = check_block_validity(inode, map); |
6fd058f7 TT |
635 | if (ret != 0) |
636 | return ret; | |
637 | } | |
0e855ac8 AK |
638 | return retval; |
639 | } | |
640 | ||
f3bd1f3f MC |
641 | /* Maximum number of blocks we map for direct IO at once. */ |
642 | #define DIO_MAX_BLOCKS 4096 | |
643 | ||
2ed88685 TT |
644 | static int _ext4_get_block(struct inode *inode, sector_t iblock, |
645 | struct buffer_head *bh, int flags) | |
ac27a0ec | 646 | { |
3e4fdaf8 | 647 | handle_t *handle = ext4_journal_current_handle(); |
2ed88685 | 648 | struct ext4_map_blocks map; |
7fb5409d | 649 | int ret = 0, started = 0; |
f3bd1f3f | 650 | int dio_credits; |
ac27a0ec | 651 | |
46c7f254 TM |
652 | if (ext4_has_inline_data(inode)) |
653 | return -ERANGE; | |
654 | ||
2ed88685 TT |
655 | map.m_lblk = iblock; |
656 | map.m_len = bh->b_size >> inode->i_blkbits; | |
657 | ||
8b0f165f | 658 | if (flags && !(flags & EXT4_GET_BLOCKS_NO_LOCK) && !handle) { |
7fb5409d | 659 | /* Direct IO write... */ |
2ed88685 TT |
660 | if (map.m_len > DIO_MAX_BLOCKS) |
661 | map.m_len = DIO_MAX_BLOCKS; | |
662 | dio_credits = ext4_chunk_trans_blocks(inode, map.m_len); | |
f3bd1f3f | 663 | handle = ext4_journal_start(inode, dio_credits); |
7fb5409d | 664 | if (IS_ERR(handle)) { |
ac27a0ec | 665 | ret = PTR_ERR(handle); |
2ed88685 | 666 | return ret; |
ac27a0ec | 667 | } |
7fb5409d | 668 | started = 1; |
ac27a0ec DK |
669 | } |
670 | ||
2ed88685 | 671 | ret = ext4_map_blocks(handle, inode, &map, flags); |
7fb5409d | 672 | if (ret > 0) { |
2ed88685 TT |
673 | map_bh(bh, inode->i_sb, map.m_pblk); |
674 | bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags; | |
675 | bh->b_size = inode->i_sb->s_blocksize * map.m_len; | |
7fb5409d | 676 | ret = 0; |
ac27a0ec | 677 | } |
7fb5409d JK |
678 | if (started) |
679 | ext4_journal_stop(handle); | |
ac27a0ec DK |
680 | return ret; |
681 | } | |
682 | ||
2ed88685 TT |
683 | int ext4_get_block(struct inode *inode, sector_t iblock, |
684 | struct buffer_head *bh, int create) | |
685 | { | |
686 | return _ext4_get_block(inode, iblock, bh, | |
687 | create ? EXT4_GET_BLOCKS_CREATE : 0); | |
688 | } | |
689 | ||
ac27a0ec DK |
690 | /* |
691 | * `handle' can be NULL if create is zero | |
692 | */ | |
617ba13b | 693 | struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode, |
725d26d3 | 694 | ext4_lblk_t block, int create, int *errp) |
ac27a0ec | 695 | { |
2ed88685 TT |
696 | struct ext4_map_blocks map; |
697 | struct buffer_head *bh; | |
ac27a0ec DK |
698 | int fatal = 0, err; |
699 | ||
700 | J_ASSERT(handle != NULL || create == 0); | |
701 | ||
2ed88685 TT |
702 | map.m_lblk = block; |
703 | map.m_len = 1; | |
704 | err = ext4_map_blocks(handle, inode, &map, | |
705 | create ? EXT4_GET_BLOCKS_CREATE : 0); | |
ac27a0ec | 706 | |
90b0a973 CM |
707 | /* ensure we send some value back into *errp */ |
708 | *errp = 0; | |
709 | ||
2ed88685 TT |
710 | if (err < 0) |
711 | *errp = err; | |
712 | if (err <= 0) | |
713 | return NULL; | |
2ed88685 TT |
714 | |
715 | bh = sb_getblk(inode->i_sb, map.m_pblk); | |
716 | if (!bh) { | |
717 | *errp = -EIO; | |
718 | return NULL; | |
ac27a0ec | 719 | } |
2ed88685 TT |
720 | if (map.m_flags & EXT4_MAP_NEW) { |
721 | J_ASSERT(create != 0); | |
722 | J_ASSERT(handle != NULL); | |
ac27a0ec | 723 | |
2ed88685 TT |
724 | /* |
725 | * Now that we do not always journal data, we should | |
726 | * keep in mind whether this should always journal the | |
727 | * new buffer as metadata. For now, regular file | |
728 | * writes use ext4_get_block instead, so it's not a | |
729 | * problem. | |
730 | */ | |
731 | lock_buffer(bh); | |
732 | BUFFER_TRACE(bh, "call get_create_access"); | |
733 | fatal = ext4_journal_get_create_access(handle, bh); | |
734 | if (!fatal && !buffer_uptodate(bh)) { | |
735 | memset(bh->b_data, 0, inode->i_sb->s_blocksize); | |
736 | set_buffer_uptodate(bh); | |
ac27a0ec | 737 | } |
2ed88685 TT |
738 | unlock_buffer(bh); |
739 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); | |
740 | err = ext4_handle_dirty_metadata(handle, inode, bh); | |
741 | if (!fatal) | |
742 | fatal = err; | |
743 | } else { | |
744 | BUFFER_TRACE(bh, "not a new buffer"); | |
ac27a0ec | 745 | } |
2ed88685 TT |
746 | if (fatal) { |
747 | *errp = fatal; | |
748 | brelse(bh); | |
749 | bh = NULL; | |
750 | } | |
751 | return bh; | |
ac27a0ec DK |
752 | } |
753 | ||
617ba13b | 754 | struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode, |
725d26d3 | 755 | ext4_lblk_t block, int create, int *err) |
ac27a0ec | 756 | { |
af5bc92d | 757 | struct buffer_head *bh; |
ac27a0ec | 758 | |
617ba13b | 759 | bh = ext4_getblk(handle, inode, block, create, err); |
ac27a0ec DK |
760 | if (!bh) |
761 | return bh; | |
762 | if (buffer_uptodate(bh)) | |
763 | return bh; | |
65299a3b | 764 | ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &bh); |
ac27a0ec DK |
765 | wait_on_buffer(bh); |
766 | if (buffer_uptodate(bh)) | |
767 | return bh; | |
768 | put_bh(bh); | |
769 | *err = -EIO; | |
770 | return NULL; | |
771 | } | |
772 | ||
f19d5870 TM |
773 | int ext4_walk_page_buffers(handle_t *handle, |
774 | struct buffer_head *head, | |
775 | unsigned from, | |
776 | unsigned to, | |
777 | int *partial, | |
778 | int (*fn)(handle_t *handle, | |
779 | struct buffer_head *bh)) | |
ac27a0ec DK |
780 | { |
781 | struct buffer_head *bh; | |
782 | unsigned block_start, block_end; | |
783 | unsigned blocksize = head->b_size; | |
784 | int err, ret = 0; | |
785 | struct buffer_head *next; | |
786 | ||
af5bc92d TT |
787 | for (bh = head, block_start = 0; |
788 | ret == 0 && (bh != head || !block_start); | |
de9a55b8 | 789 | block_start = block_end, bh = next) { |
ac27a0ec DK |
790 | next = bh->b_this_page; |
791 | block_end = block_start + blocksize; | |
792 | if (block_end <= from || block_start >= to) { | |
793 | if (partial && !buffer_uptodate(bh)) | |
794 | *partial = 1; | |
795 | continue; | |
796 | } | |
797 | err = (*fn)(handle, bh); | |
798 | if (!ret) | |
799 | ret = err; | |
800 | } | |
801 | return ret; | |
802 | } | |
803 | ||
804 | /* | |
805 | * To preserve ordering, it is essential that the hole instantiation and | |
806 | * the data write be encapsulated in a single transaction. We cannot | |
617ba13b | 807 | * close off a transaction and start a new one between the ext4_get_block() |
dab291af | 808 | * and the commit_write(). So doing the jbd2_journal_start at the start of |
ac27a0ec DK |
809 | * prepare_write() is the right place. |
810 | * | |
617ba13b MC |
811 | * Also, this function can nest inside ext4_writepage() -> |
812 | * block_write_full_page(). In that case, we *know* that ext4_writepage() | |
ac27a0ec DK |
813 | * has generated enough buffer credits to do the whole page. So we won't |
814 | * block on the journal in that case, which is good, because the caller may | |
815 | * be PF_MEMALLOC. | |
816 | * | |
617ba13b | 817 | * By accident, ext4 can be reentered when a transaction is open via |
ac27a0ec DK |
818 | * quota file writes. If we were to commit the transaction while thus |
819 | * reentered, there can be a deadlock - we would be holding a quota | |
820 | * lock, and the commit would never complete if another thread had a | |
821 | * transaction open and was blocking on the quota lock - a ranking | |
822 | * violation. | |
823 | * | |
dab291af | 824 | * So what we do is to rely on the fact that jbd2_journal_stop/journal_start |
ac27a0ec DK |
825 | * will _not_ run commit under these circumstances because handle->h_ref |
826 | * is elevated. We'll still have enough credits for the tiny quotafile | |
827 | * write. | |
828 | */ | |
f19d5870 TM |
829 | int do_journal_get_write_access(handle_t *handle, |
830 | struct buffer_head *bh) | |
ac27a0ec | 831 | { |
56d35a4c JK |
832 | int dirty = buffer_dirty(bh); |
833 | int ret; | |
834 | ||
ac27a0ec DK |
835 | if (!buffer_mapped(bh) || buffer_freed(bh)) |
836 | return 0; | |
56d35a4c | 837 | /* |
ebdec241 | 838 | * __block_write_begin() could have dirtied some buffers. Clean |
56d35a4c JK |
839 | * the dirty bit as jbd2_journal_get_write_access() could complain |
840 | * otherwise about fs integrity issues. Setting of the dirty bit | |
ebdec241 | 841 | * by __block_write_begin() isn't a real problem here as we clear |
56d35a4c JK |
842 | * the bit before releasing a page lock and thus writeback cannot |
843 | * ever write the buffer. | |
844 | */ | |
845 | if (dirty) | |
846 | clear_buffer_dirty(bh); | |
847 | ret = ext4_journal_get_write_access(handle, bh); | |
848 | if (!ret && dirty) | |
849 | ret = ext4_handle_dirty_metadata(handle, NULL, bh); | |
850 | return ret; | |
ac27a0ec DK |
851 | } |
852 | ||
8b0f165f AP |
853 | static int ext4_get_block_write_nolock(struct inode *inode, sector_t iblock, |
854 | struct buffer_head *bh_result, int create); | |
bfc1af65 | 855 | static int ext4_write_begin(struct file *file, struct address_space *mapping, |
de9a55b8 TT |
856 | loff_t pos, unsigned len, unsigned flags, |
857 | struct page **pagep, void **fsdata) | |
ac27a0ec | 858 | { |
af5bc92d | 859 | struct inode *inode = mapping->host; |
1938a150 | 860 | int ret, needed_blocks; |
ac27a0ec DK |
861 | handle_t *handle; |
862 | int retries = 0; | |
af5bc92d | 863 | struct page *page; |
de9a55b8 | 864 | pgoff_t index; |
af5bc92d | 865 | unsigned from, to; |
bfc1af65 | 866 | |
9bffad1e | 867 | trace_ext4_write_begin(inode, pos, len, flags); |
1938a150 AK |
868 | /* |
869 | * Reserve one block more for addition to orphan list in case | |
870 | * we allocate blocks but write fails for some reason | |
871 | */ | |
872 | needed_blocks = ext4_writepage_trans_blocks(inode) + 1; | |
de9a55b8 | 873 | index = pos >> PAGE_CACHE_SHIFT; |
af5bc92d TT |
874 | from = pos & (PAGE_CACHE_SIZE - 1); |
875 | to = from + len; | |
ac27a0ec | 876 | |
f19d5870 TM |
877 | if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) { |
878 | ret = ext4_try_to_write_inline_data(mapping, inode, pos, len, | |
879 | flags, pagep); | |
880 | if (ret < 0) | |
881 | goto out; | |
882 | if (ret == 1) { | |
883 | ret = 0; | |
884 | goto out; | |
885 | } | |
886 | } | |
887 | ||
ac27a0ec | 888 | retry: |
af5bc92d TT |
889 | handle = ext4_journal_start(inode, needed_blocks); |
890 | if (IS_ERR(handle)) { | |
891 | ret = PTR_ERR(handle); | |
892 | goto out; | |
7479d2b9 | 893 | } |
ac27a0ec | 894 | |
ebd3610b JK |
895 | /* We cannot recurse into the filesystem as the transaction is already |
896 | * started */ | |
897 | flags |= AOP_FLAG_NOFS; | |
898 | ||
54566b2c | 899 | page = grab_cache_page_write_begin(mapping, index, flags); |
cf108bca JK |
900 | if (!page) { |
901 | ext4_journal_stop(handle); | |
902 | ret = -ENOMEM; | |
903 | goto out; | |
904 | } | |
f19d5870 | 905 | |
cf108bca JK |
906 | *pagep = page; |
907 | ||
744692dc | 908 | if (ext4_should_dioread_nolock(inode)) |
6e1db88d | 909 | ret = __block_write_begin(page, pos, len, ext4_get_block_write); |
744692dc | 910 | else |
6e1db88d | 911 | ret = __block_write_begin(page, pos, len, ext4_get_block); |
bfc1af65 NP |
912 | |
913 | if (!ret && ext4_should_journal_data(inode)) { | |
f19d5870 TM |
914 | ret = ext4_walk_page_buffers(handle, page_buffers(page), |
915 | from, to, NULL, | |
916 | do_journal_get_write_access); | |
ac27a0ec | 917 | } |
bfc1af65 NP |
918 | |
919 | if (ret) { | |
af5bc92d | 920 | unlock_page(page); |
af5bc92d | 921 | page_cache_release(page); |
ae4d5372 | 922 | /* |
6e1db88d | 923 | * __block_write_begin may have instantiated a few blocks |
ae4d5372 AK |
924 | * outside i_size. Trim these off again. Don't need |
925 | * i_size_read because we hold i_mutex. | |
1938a150 AK |
926 | * |
927 | * Add inode to orphan list in case we crash before | |
928 | * truncate finishes | |
ae4d5372 | 929 | */ |
ffacfa7a | 930 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
1938a150 AK |
931 | ext4_orphan_add(handle, inode); |
932 | ||
933 | ext4_journal_stop(handle); | |
934 | if (pos + len > inode->i_size) { | |
b9a4207d | 935 | ext4_truncate_failed_write(inode); |
de9a55b8 | 936 | /* |
ffacfa7a | 937 | * If truncate failed early the inode might |
1938a150 AK |
938 | * still be on the orphan list; we need to |
939 | * make sure the inode is removed from the | |
940 | * orphan list in that case. | |
941 | */ | |
942 | if (inode->i_nlink) | |
943 | ext4_orphan_del(NULL, inode); | |
944 | } | |
bfc1af65 NP |
945 | } |
946 | ||
617ba13b | 947 | if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) |
ac27a0ec | 948 | goto retry; |
7479d2b9 | 949 | out: |
ac27a0ec DK |
950 | return ret; |
951 | } | |
952 | ||
bfc1af65 NP |
953 | /* For write_end() in data=journal mode */ |
954 | static int write_end_fn(handle_t *handle, struct buffer_head *bh) | |
ac27a0ec DK |
955 | { |
956 | if (!buffer_mapped(bh) || buffer_freed(bh)) | |
957 | return 0; | |
958 | set_buffer_uptodate(bh); | |
0390131b | 959 | return ext4_handle_dirty_metadata(handle, NULL, bh); |
ac27a0ec DK |
960 | } |
961 | ||
f8514083 | 962 | static int ext4_generic_write_end(struct file *file, |
de9a55b8 TT |
963 | struct address_space *mapping, |
964 | loff_t pos, unsigned len, unsigned copied, | |
965 | struct page *page, void *fsdata) | |
f8514083 AK |
966 | { |
967 | int i_size_changed = 0; | |
968 | struct inode *inode = mapping->host; | |
969 | handle_t *handle = ext4_journal_current_handle(); | |
970 | ||
f19d5870 TM |
971 | if (ext4_has_inline_data(inode)) |
972 | copied = ext4_write_inline_data_end(inode, pos, len, | |
973 | copied, page); | |
974 | else | |
975 | copied = block_write_end(file, mapping, pos, | |
976 | len, copied, page, fsdata); | |
f8514083 AK |
977 | |
978 | /* | |
979 | * No need to use i_size_read() here, the i_size | |
980 | * cannot change under us because we hold i_mutex. | |
981 | * | |
982 | * But it's important to update i_size while still holding page lock: | |
983 | * page writeout could otherwise come in and zero beyond i_size. | |
984 | */ | |
985 | if (pos + copied > inode->i_size) { | |
986 | i_size_write(inode, pos + copied); | |
987 | i_size_changed = 1; | |
988 | } | |
989 | ||
990 | if (pos + copied > EXT4_I(inode)->i_disksize) { | |
991 | /* We need to mark inode dirty even if | |
992 | * new_i_size is less that inode->i_size | |
993 | * bu greater than i_disksize.(hint delalloc) | |
994 | */ | |
995 | ext4_update_i_disksize(inode, (pos + copied)); | |
996 | i_size_changed = 1; | |
997 | } | |
998 | unlock_page(page); | |
999 | page_cache_release(page); | |
1000 | ||
1001 | /* | |
1002 | * Don't mark the inode dirty under page lock. First, it unnecessarily | |
1003 | * makes the holding time of page lock longer. Second, it forces lock | |
1004 | * ordering of page lock and transaction start for journaling | |
1005 | * filesystems. | |
1006 | */ | |
1007 | if (i_size_changed) | |
1008 | ext4_mark_inode_dirty(handle, inode); | |
1009 | ||
1010 | return copied; | |
1011 | } | |
1012 | ||
ac27a0ec DK |
1013 | /* |
1014 | * We need to pick up the new inode size which generic_commit_write gave us | |
1015 | * `file' can be NULL - eg, when called from page_symlink(). | |
1016 | * | |
617ba13b | 1017 | * ext4 never places buffers on inode->i_mapping->private_list. metadata |
ac27a0ec DK |
1018 | * buffers are managed internally. |
1019 | */ | |
bfc1af65 | 1020 | static int ext4_ordered_write_end(struct file *file, |
de9a55b8 TT |
1021 | struct address_space *mapping, |
1022 | loff_t pos, unsigned len, unsigned copied, | |
1023 | struct page *page, void *fsdata) | |
ac27a0ec | 1024 | { |
617ba13b | 1025 | handle_t *handle = ext4_journal_current_handle(); |
cf108bca | 1026 | struct inode *inode = mapping->host; |
ac27a0ec DK |
1027 | int ret = 0, ret2; |
1028 | ||
9bffad1e | 1029 | trace_ext4_ordered_write_end(inode, pos, len, copied); |
678aaf48 | 1030 | ret = ext4_jbd2_file_inode(handle, inode); |
ac27a0ec DK |
1031 | |
1032 | if (ret == 0) { | |
f8514083 | 1033 | ret2 = ext4_generic_write_end(file, mapping, pos, len, copied, |
bfc1af65 | 1034 | page, fsdata); |
f8a87d89 | 1035 | copied = ret2; |
ffacfa7a | 1036 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
f8514083 AK |
1037 | /* if we have allocated more blocks and copied |
1038 | * less. We will have blocks allocated outside | |
1039 | * inode->i_size. So truncate them | |
1040 | */ | |
1041 | ext4_orphan_add(handle, inode); | |
f8a87d89 RK |
1042 | if (ret2 < 0) |
1043 | ret = ret2; | |
09e0834f AF |
1044 | } else { |
1045 | unlock_page(page); | |
1046 | page_cache_release(page); | |
ac27a0ec | 1047 | } |
09e0834f | 1048 | |
617ba13b | 1049 | ret2 = ext4_journal_stop(handle); |
ac27a0ec DK |
1050 | if (!ret) |
1051 | ret = ret2; | |
bfc1af65 | 1052 | |
f8514083 | 1053 | if (pos + len > inode->i_size) { |
b9a4207d | 1054 | ext4_truncate_failed_write(inode); |
de9a55b8 | 1055 | /* |
ffacfa7a | 1056 | * If truncate failed early the inode might still be |
f8514083 AK |
1057 | * on the orphan list; we need to make sure the inode |
1058 | * is removed from the orphan list in that case. | |
1059 | */ | |
1060 | if (inode->i_nlink) | |
1061 | ext4_orphan_del(NULL, inode); | |
1062 | } | |
1063 | ||
1064 | ||
bfc1af65 | 1065 | return ret ? ret : copied; |
ac27a0ec DK |
1066 | } |
1067 | ||
bfc1af65 | 1068 | static int ext4_writeback_write_end(struct file *file, |
de9a55b8 TT |
1069 | struct address_space *mapping, |
1070 | loff_t pos, unsigned len, unsigned copied, | |
1071 | struct page *page, void *fsdata) | |
ac27a0ec | 1072 | { |
617ba13b | 1073 | handle_t *handle = ext4_journal_current_handle(); |
cf108bca | 1074 | struct inode *inode = mapping->host; |
ac27a0ec | 1075 | int ret = 0, ret2; |
ac27a0ec | 1076 | |
9bffad1e | 1077 | trace_ext4_writeback_write_end(inode, pos, len, copied); |
f8514083 | 1078 | ret2 = ext4_generic_write_end(file, mapping, pos, len, copied, |
bfc1af65 | 1079 | page, fsdata); |
f8a87d89 | 1080 | copied = ret2; |
ffacfa7a | 1081 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
f8514083 AK |
1082 | /* if we have allocated more blocks and copied |
1083 | * less. We will have blocks allocated outside | |
1084 | * inode->i_size. So truncate them | |
1085 | */ | |
1086 | ext4_orphan_add(handle, inode); | |
1087 | ||
f8a87d89 RK |
1088 | if (ret2 < 0) |
1089 | ret = ret2; | |
ac27a0ec | 1090 | |
617ba13b | 1091 | ret2 = ext4_journal_stop(handle); |
ac27a0ec DK |
1092 | if (!ret) |
1093 | ret = ret2; | |
bfc1af65 | 1094 | |
f8514083 | 1095 | if (pos + len > inode->i_size) { |
b9a4207d | 1096 | ext4_truncate_failed_write(inode); |
de9a55b8 | 1097 | /* |
ffacfa7a | 1098 | * If truncate failed early the inode might still be |
f8514083 AK |
1099 | * on the orphan list; we need to make sure the inode |
1100 | * is removed from the orphan list in that case. | |
1101 | */ | |
1102 | if (inode->i_nlink) | |
1103 | ext4_orphan_del(NULL, inode); | |
1104 | } | |
1105 | ||
bfc1af65 | 1106 | return ret ? ret : copied; |
ac27a0ec DK |
1107 | } |
1108 | ||
bfc1af65 | 1109 | static int ext4_journalled_write_end(struct file *file, |
de9a55b8 TT |
1110 | struct address_space *mapping, |
1111 | loff_t pos, unsigned len, unsigned copied, | |
1112 | struct page *page, void *fsdata) | |
ac27a0ec | 1113 | { |
617ba13b | 1114 | handle_t *handle = ext4_journal_current_handle(); |
bfc1af65 | 1115 | struct inode *inode = mapping->host; |
ac27a0ec DK |
1116 | int ret = 0, ret2; |
1117 | int partial = 0; | |
bfc1af65 | 1118 | unsigned from, to; |
cf17fea6 | 1119 | loff_t new_i_size; |
ac27a0ec | 1120 | |
9bffad1e | 1121 | trace_ext4_journalled_write_end(inode, pos, len, copied); |
bfc1af65 NP |
1122 | from = pos & (PAGE_CACHE_SIZE - 1); |
1123 | to = from + len; | |
1124 | ||
441c8508 CW |
1125 | BUG_ON(!ext4_handle_valid(handle)); |
1126 | ||
bfc1af65 NP |
1127 | if (copied < len) { |
1128 | if (!PageUptodate(page)) | |
1129 | copied = 0; | |
1130 | page_zero_new_buffers(page, from+copied, to); | |
1131 | } | |
ac27a0ec | 1132 | |
f19d5870 TM |
1133 | ret = ext4_walk_page_buffers(handle, page_buffers(page), from, |
1134 | to, &partial, write_end_fn); | |
ac27a0ec DK |
1135 | if (!partial) |
1136 | SetPageUptodate(page); | |
cf17fea6 AK |
1137 | new_i_size = pos + copied; |
1138 | if (new_i_size > inode->i_size) | |
bfc1af65 | 1139 | i_size_write(inode, pos+copied); |
19f5fb7a | 1140 | ext4_set_inode_state(inode, EXT4_STATE_JDATA); |
2d859db3 | 1141 | EXT4_I(inode)->i_datasync_tid = handle->h_transaction->t_tid; |
cf17fea6 AK |
1142 | if (new_i_size > EXT4_I(inode)->i_disksize) { |
1143 | ext4_update_i_disksize(inode, new_i_size); | |
617ba13b | 1144 | ret2 = ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
1145 | if (!ret) |
1146 | ret = ret2; | |
1147 | } | |
bfc1af65 | 1148 | |
cf108bca | 1149 | unlock_page(page); |
f8514083 | 1150 | page_cache_release(page); |
ffacfa7a | 1151 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
f8514083 AK |
1152 | /* if we have allocated more blocks and copied |
1153 | * less. We will have blocks allocated outside | |
1154 | * inode->i_size. So truncate them | |
1155 | */ | |
1156 | ext4_orphan_add(handle, inode); | |
1157 | ||
617ba13b | 1158 | ret2 = ext4_journal_stop(handle); |
ac27a0ec DK |
1159 | if (!ret) |
1160 | ret = ret2; | |
f8514083 | 1161 | if (pos + len > inode->i_size) { |
b9a4207d | 1162 | ext4_truncate_failed_write(inode); |
de9a55b8 | 1163 | /* |
ffacfa7a | 1164 | * If truncate failed early the inode might still be |
f8514083 AK |
1165 | * on the orphan list; we need to make sure the inode |
1166 | * is removed from the orphan list in that case. | |
1167 | */ | |
1168 | if (inode->i_nlink) | |
1169 | ext4_orphan_del(NULL, inode); | |
1170 | } | |
bfc1af65 NP |
1171 | |
1172 | return ret ? ret : copied; | |
ac27a0ec | 1173 | } |
d2a17637 | 1174 | |
9d0be502 | 1175 | /* |
7b415bf6 | 1176 | * Reserve a single cluster located at lblock |
9d0be502 | 1177 | */ |
01f49d0b | 1178 | static int ext4_da_reserve_space(struct inode *inode, ext4_lblk_t lblock) |
d2a17637 | 1179 | { |
030ba6bc | 1180 | int retries = 0; |
60e58e0f | 1181 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
0637c6f4 | 1182 | struct ext4_inode_info *ei = EXT4_I(inode); |
7b415bf6 | 1183 | unsigned int md_needed; |
5dd4056d | 1184 | int ret; |
03179fe9 TT |
1185 | ext4_lblk_t save_last_lblock; |
1186 | int save_len; | |
1187 | ||
1188 | /* | |
1189 | * We will charge metadata quota at writeout time; this saves | |
1190 | * us from metadata over-estimation, though we may go over by | |
1191 | * a small amount in the end. Here we just reserve for data. | |
1192 | */ | |
1193 | ret = dquot_reserve_block(inode, EXT4_C2B(sbi, 1)); | |
1194 | if (ret) | |
1195 | return ret; | |
d2a17637 MC |
1196 | |
1197 | /* | |
1198 | * recalculate the amount of metadata blocks to reserve | |
1199 | * in order to allocate nrblocks | |
1200 | * worse case is one extent per block | |
1201 | */ | |
030ba6bc | 1202 | repeat: |
0637c6f4 | 1203 | spin_lock(&ei->i_block_reservation_lock); |
03179fe9 TT |
1204 | /* |
1205 | * ext4_calc_metadata_amount() has side effects, which we have | |
1206 | * to be prepared undo if we fail to claim space. | |
1207 | */ | |
1208 | save_len = ei->i_da_metadata_calc_len; | |
1209 | save_last_lblock = ei->i_da_metadata_calc_last_lblock; | |
7b415bf6 AK |
1210 | md_needed = EXT4_NUM_B2C(sbi, |
1211 | ext4_calc_metadata_amount(inode, lblock)); | |
f8ec9d68 | 1212 | trace_ext4_da_reserve_space(inode, md_needed); |
d2a17637 | 1213 | |
72b8ab9d ES |
1214 | /* |
1215 | * We do still charge estimated metadata to the sb though; | |
1216 | * we cannot afford to run out of free blocks. | |
1217 | */ | |
e7d5f315 | 1218 | if (ext4_claim_free_clusters(sbi, md_needed + 1, 0)) { |
03179fe9 TT |
1219 | ei->i_da_metadata_calc_len = save_len; |
1220 | ei->i_da_metadata_calc_last_lblock = save_last_lblock; | |
1221 | spin_unlock(&ei->i_block_reservation_lock); | |
030ba6bc AK |
1222 | if (ext4_should_retry_alloc(inode->i_sb, &retries)) { |
1223 | yield(); | |
1224 | goto repeat; | |
1225 | } | |
03179fe9 | 1226 | dquot_release_reservation_block(inode, EXT4_C2B(sbi, 1)); |
d2a17637 MC |
1227 | return -ENOSPC; |
1228 | } | |
9d0be502 | 1229 | ei->i_reserved_data_blocks++; |
0637c6f4 TT |
1230 | ei->i_reserved_meta_blocks += md_needed; |
1231 | spin_unlock(&ei->i_block_reservation_lock); | |
39bc680a | 1232 | |
d2a17637 MC |
1233 | return 0; /* success */ |
1234 | } | |
1235 | ||
12219aea | 1236 | static void ext4_da_release_space(struct inode *inode, int to_free) |
d2a17637 MC |
1237 | { |
1238 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
0637c6f4 | 1239 | struct ext4_inode_info *ei = EXT4_I(inode); |
d2a17637 | 1240 | |
cd213226 MC |
1241 | if (!to_free) |
1242 | return; /* Nothing to release, exit */ | |
1243 | ||
d2a17637 | 1244 | spin_lock(&EXT4_I(inode)->i_block_reservation_lock); |
cd213226 | 1245 | |
5a58ec87 | 1246 | trace_ext4_da_release_space(inode, to_free); |
0637c6f4 | 1247 | if (unlikely(to_free > ei->i_reserved_data_blocks)) { |
cd213226 | 1248 | /* |
0637c6f4 TT |
1249 | * if there aren't enough reserved blocks, then the |
1250 | * counter is messed up somewhere. Since this | |
1251 | * function is called from invalidate page, it's | |
1252 | * harmless to return without any action. | |
cd213226 | 1253 | */ |
0637c6f4 TT |
1254 | ext4_msg(inode->i_sb, KERN_NOTICE, "ext4_da_release_space: " |
1255 | "ino %lu, to_free %d with only %d reserved " | |
1084f252 | 1256 | "data blocks", inode->i_ino, to_free, |
0637c6f4 TT |
1257 | ei->i_reserved_data_blocks); |
1258 | WARN_ON(1); | |
1259 | to_free = ei->i_reserved_data_blocks; | |
cd213226 | 1260 | } |
0637c6f4 | 1261 | ei->i_reserved_data_blocks -= to_free; |
cd213226 | 1262 | |
0637c6f4 TT |
1263 | if (ei->i_reserved_data_blocks == 0) { |
1264 | /* | |
1265 | * We can release all of the reserved metadata blocks | |
1266 | * only when we have written all of the delayed | |
1267 | * allocation blocks. | |
7b415bf6 AK |
1268 | * Note that in case of bigalloc, i_reserved_meta_blocks, |
1269 | * i_reserved_data_blocks, etc. refer to number of clusters. | |
0637c6f4 | 1270 | */ |
57042651 | 1271 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, |
72b8ab9d | 1272 | ei->i_reserved_meta_blocks); |
ee5f4d9c | 1273 | ei->i_reserved_meta_blocks = 0; |
9d0be502 | 1274 | ei->i_da_metadata_calc_len = 0; |
0637c6f4 | 1275 | } |
d2a17637 | 1276 | |
72b8ab9d | 1277 | /* update fs dirty data blocks counter */ |
57042651 | 1278 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, to_free); |
d2a17637 | 1279 | |
d2a17637 | 1280 | spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); |
60e58e0f | 1281 | |
7b415bf6 | 1282 | dquot_release_reservation_block(inode, EXT4_C2B(sbi, to_free)); |
d2a17637 MC |
1283 | } |
1284 | ||
1285 | static void ext4_da_page_release_reservation(struct page *page, | |
de9a55b8 | 1286 | unsigned long offset) |
d2a17637 MC |
1287 | { |
1288 | int to_release = 0; | |
1289 | struct buffer_head *head, *bh; | |
1290 | unsigned int curr_off = 0; | |
7b415bf6 AK |
1291 | struct inode *inode = page->mapping->host; |
1292 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
1293 | int num_clusters; | |
51865fda | 1294 | ext4_fsblk_t lblk; |
d2a17637 MC |
1295 | |
1296 | head = page_buffers(page); | |
1297 | bh = head; | |
1298 | do { | |
1299 | unsigned int next_off = curr_off + bh->b_size; | |
1300 | ||
1301 | if ((offset <= curr_off) && (buffer_delay(bh))) { | |
1302 | to_release++; | |
1303 | clear_buffer_delay(bh); | |
1304 | } | |
1305 | curr_off = next_off; | |
1306 | } while ((bh = bh->b_this_page) != head); | |
7b415bf6 | 1307 | |
51865fda ZL |
1308 | if (to_release) { |
1309 | lblk = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1310 | ext4_es_remove_extent(inode, lblk, to_release); | |
1311 | } | |
1312 | ||
7b415bf6 AK |
1313 | /* If we have released all the blocks belonging to a cluster, then we |
1314 | * need to release the reserved space for that cluster. */ | |
1315 | num_clusters = EXT4_NUM_B2C(sbi, to_release); | |
1316 | while (num_clusters > 0) { | |
7b415bf6 AK |
1317 | lblk = (page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits)) + |
1318 | ((num_clusters - 1) << sbi->s_cluster_bits); | |
1319 | if (sbi->s_cluster_ratio == 1 || | |
7d1b1fbc | 1320 | !ext4_find_delalloc_cluster(inode, lblk)) |
7b415bf6 AK |
1321 | ext4_da_release_space(inode, 1); |
1322 | ||
1323 | num_clusters--; | |
1324 | } | |
d2a17637 | 1325 | } |
ac27a0ec | 1326 | |
64769240 AT |
1327 | /* |
1328 | * Delayed allocation stuff | |
1329 | */ | |
1330 | ||
64769240 AT |
1331 | /* |
1332 | * mpage_da_submit_io - walks through extent of pages and try to write | |
a1d6cc56 | 1333 | * them with writepage() call back |
64769240 AT |
1334 | * |
1335 | * @mpd->inode: inode | |
1336 | * @mpd->first_page: first page of the extent | |
1337 | * @mpd->next_page: page after the last page of the extent | |
64769240 AT |
1338 | * |
1339 | * By the time mpage_da_submit_io() is called we expect all blocks | |
1340 | * to be allocated. this may be wrong if allocation failed. | |
1341 | * | |
1342 | * As pages are already locked by write_cache_pages(), we can't use it | |
1343 | */ | |
1de3e3df TT |
1344 | static int mpage_da_submit_io(struct mpage_da_data *mpd, |
1345 | struct ext4_map_blocks *map) | |
64769240 | 1346 | { |
791b7f08 AK |
1347 | struct pagevec pvec; |
1348 | unsigned long index, end; | |
1349 | int ret = 0, err, nr_pages, i; | |
1350 | struct inode *inode = mpd->inode; | |
1351 | struct address_space *mapping = inode->i_mapping; | |
cb20d518 | 1352 | loff_t size = i_size_read(inode); |
3ecdb3a1 TT |
1353 | unsigned int len, block_start; |
1354 | struct buffer_head *bh, *page_bufs = NULL; | |
cb20d518 | 1355 | int journal_data = ext4_should_journal_data(inode); |
1de3e3df | 1356 | sector_t pblock = 0, cur_logical = 0; |
bd2d0210 | 1357 | struct ext4_io_submit io_submit; |
64769240 AT |
1358 | |
1359 | BUG_ON(mpd->next_page <= mpd->first_page); | |
bd2d0210 | 1360 | memset(&io_submit, 0, sizeof(io_submit)); |
791b7f08 AK |
1361 | /* |
1362 | * We need to start from the first_page to the next_page - 1 | |
1363 | * to make sure we also write the mapped dirty buffer_heads. | |
8dc207c0 | 1364 | * If we look at mpd->b_blocknr we would only be looking |
791b7f08 AK |
1365 | * at the currently mapped buffer_heads. |
1366 | */ | |
64769240 AT |
1367 | index = mpd->first_page; |
1368 | end = mpd->next_page - 1; | |
1369 | ||
791b7f08 | 1370 | pagevec_init(&pvec, 0); |
64769240 | 1371 | while (index <= end) { |
791b7f08 | 1372 | nr_pages = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE); |
64769240 AT |
1373 | if (nr_pages == 0) |
1374 | break; | |
1375 | for (i = 0; i < nr_pages; i++) { | |
97498956 | 1376 | int commit_write = 0, skip_page = 0; |
64769240 AT |
1377 | struct page *page = pvec.pages[i]; |
1378 | ||
791b7f08 AK |
1379 | index = page->index; |
1380 | if (index > end) | |
1381 | break; | |
cb20d518 TT |
1382 | |
1383 | if (index == size >> PAGE_CACHE_SHIFT) | |
1384 | len = size & ~PAGE_CACHE_MASK; | |
1385 | else | |
1386 | len = PAGE_CACHE_SIZE; | |
1de3e3df TT |
1387 | if (map) { |
1388 | cur_logical = index << (PAGE_CACHE_SHIFT - | |
1389 | inode->i_blkbits); | |
1390 | pblock = map->m_pblk + (cur_logical - | |
1391 | map->m_lblk); | |
1392 | } | |
791b7f08 AK |
1393 | index++; |
1394 | ||
1395 | BUG_ON(!PageLocked(page)); | |
1396 | BUG_ON(PageWriteback(page)); | |
1397 | ||
64769240 | 1398 | /* |
cb20d518 TT |
1399 | * If the page does not have buffers (for |
1400 | * whatever reason), try to create them using | |
a107e5a3 | 1401 | * __block_write_begin. If this fails, |
97498956 | 1402 | * skip the page and move on. |
64769240 | 1403 | */ |
cb20d518 | 1404 | if (!page_has_buffers(page)) { |
a107e5a3 | 1405 | if (__block_write_begin(page, 0, len, |
cb20d518 | 1406 | noalloc_get_block_write)) { |
97498956 | 1407 | skip_page: |
cb20d518 TT |
1408 | unlock_page(page); |
1409 | continue; | |
1410 | } | |
1411 | commit_write = 1; | |
1412 | } | |
64769240 | 1413 | |
3ecdb3a1 TT |
1414 | bh = page_bufs = page_buffers(page); |
1415 | block_start = 0; | |
64769240 | 1416 | do { |
1de3e3df | 1417 | if (!bh) |
97498956 | 1418 | goto skip_page; |
1de3e3df TT |
1419 | if (map && (cur_logical >= map->m_lblk) && |
1420 | (cur_logical <= (map->m_lblk + | |
1421 | (map->m_len - 1)))) { | |
29fa89d0 AK |
1422 | if (buffer_delay(bh)) { |
1423 | clear_buffer_delay(bh); | |
1424 | bh->b_blocknr = pblock; | |
29fa89d0 | 1425 | } |
1de3e3df TT |
1426 | if (buffer_unwritten(bh) || |
1427 | buffer_mapped(bh)) | |
1428 | BUG_ON(bh->b_blocknr != pblock); | |
1429 | if (map->m_flags & EXT4_MAP_UNINIT) | |
1430 | set_buffer_uninit(bh); | |
1431 | clear_buffer_unwritten(bh); | |
1432 | } | |
29fa89d0 | 1433 | |
13a79a47 YY |
1434 | /* |
1435 | * skip page if block allocation undone and | |
1436 | * block is dirty | |
1437 | */ | |
1438 | if (ext4_bh_delay_or_unwritten(NULL, bh)) | |
97498956 | 1439 | skip_page = 1; |
3ecdb3a1 TT |
1440 | bh = bh->b_this_page; |
1441 | block_start += bh->b_size; | |
64769240 AT |
1442 | cur_logical++; |
1443 | pblock++; | |
1de3e3df TT |
1444 | } while (bh != page_bufs); |
1445 | ||
97498956 TT |
1446 | if (skip_page) |
1447 | goto skip_page; | |
cb20d518 TT |
1448 | |
1449 | if (commit_write) | |
1450 | /* mark the buffer_heads as dirty & uptodate */ | |
1451 | block_commit_write(page, 0, len); | |
1452 | ||
97498956 | 1453 | clear_page_dirty_for_io(page); |
bd2d0210 TT |
1454 | /* |
1455 | * Delalloc doesn't support data journalling, | |
1456 | * but eventually maybe we'll lift this | |
1457 | * restriction. | |
1458 | */ | |
1459 | if (unlikely(journal_data && PageChecked(page))) | |
cb20d518 | 1460 | err = __ext4_journalled_writepage(page, len); |
1449032b | 1461 | else if (test_opt(inode->i_sb, MBLK_IO_SUBMIT)) |
bd2d0210 TT |
1462 | err = ext4_bio_write_page(&io_submit, page, |
1463 | len, mpd->wbc); | |
9dd75f1f TT |
1464 | else if (buffer_uninit(page_bufs)) { |
1465 | ext4_set_bh_endio(page_bufs, inode); | |
1466 | err = block_write_full_page_endio(page, | |
1467 | noalloc_get_block_write, | |
1468 | mpd->wbc, ext4_end_io_buffer_write); | |
1469 | } else | |
1449032b TT |
1470 | err = block_write_full_page(page, |
1471 | noalloc_get_block_write, mpd->wbc); | |
cb20d518 TT |
1472 | |
1473 | if (!err) | |
a1d6cc56 | 1474 | mpd->pages_written++; |
64769240 AT |
1475 | /* |
1476 | * In error case, we have to continue because | |
1477 | * remaining pages are still locked | |
64769240 AT |
1478 | */ |
1479 | if (ret == 0) | |
1480 | ret = err; | |
64769240 AT |
1481 | } |
1482 | pagevec_release(&pvec); | |
1483 | } | |
bd2d0210 | 1484 | ext4_io_submit(&io_submit); |
64769240 | 1485 | return ret; |
64769240 AT |
1486 | } |
1487 | ||
c7f5938a | 1488 | static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd) |
c4a0c46e AK |
1489 | { |
1490 | int nr_pages, i; | |
1491 | pgoff_t index, end; | |
1492 | struct pagevec pvec; | |
1493 | struct inode *inode = mpd->inode; | |
1494 | struct address_space *mapping = inode->i_mapping; | |
51865fda | 1495 | ext4_lblk_t start, last; |
c4a0c46e | 1496 | |
c7f5938a CW |
1497 | index = mpd->first_page; |
1498 | end = mpd->next_page - 1; | |
51865fda ZL |
1499 | |
1500 | start = index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1501 | last = end << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1502 | ext4_es_remove_extent(inode, start, last - start + 1); | |
1503 | ||
66bea92c | 1504 | pagevec_init(&pvec, 0); |
c4a0c46e AK |
1505 | while (index <= end) { |
1506 | nr_pages = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE); | |
1507 | if (nr_pages == 0) | |
1508 | break; | |
1509 | for (i = 0; i < nr_pages; i++) { | |
1510 | struct page *page = pvec.pages[i]; | |
9b1d0998 | 1511 | if (page->index > end) |
c4a0c46e | 1512 | break; |
c4a0c46e AK |
1513 | BUG_ON(!PageLocked(page)); |
1514 | BUG_ON(PageWriteback(page)); | |
1515 | block_invalidatepage(page, 0); | |
1516 | ClearPageUptodate(page); | |
1517 | unlock_page(page); | |
1518 | } | |
9b1d0998 JK |
1519 | index = pvec.pages[nr_pages - 1]->index + 1; |
1520 | pagevec_release(&pvec); | |
c4a0c46e AK |
1521 | } |
1522 | return; | |
1523 | } | |
1524 | ||
df22291f AK |
1525 | static void ext4_print_free_blocks(struct inode *inode) |
1526 | { | |
1527 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
92b97816 TT |
1528 | struct super_block *sb = inode->i_sb; |
1529 | ||
1530 | ext4_msg(sb, KERN_CRIT, "Total free blocks count %lld", | |
5dee5437 TT |
1531 | EXT4_C2B(EXT4_SB(inode->i_sb), |
1532 | ext4_count_free_clusters(inode->i_sb))); | |
92b97816 TT |
1533 | ext4_msg(sb, KERN_CRIT, "Free/Dirty block details"); |
1534 | ext4_msg(sb, KERN_CRIT, "free_blocks=%lld", | |
57042651 TT |
1535 | (long long) EXT4_C2B(EXT4_SB(inode->i_sb), |
1536 | percpu_counter_sum(&sbi->s_freeclusters_counter))); | |
92b97816 | 1537 | ext4_msg(sb, KERN_CRIT, "dirty_blocks=%lld", |
7b415bf6 AK |
1538 | (long long) EXT4_C2B(EXT4_SB(inode->i_sb), |
1539 | percpu_counter_sum(&sbi->s_dirtyclusters_counter))); | |
92b97816 TT |
1540 | ext4_msg(sb, KERN_CRIT, "Block reservation details"); |
1541 | ext4_msg(sb, KERN_CRIT, "i_reserved_data_blocks=%u", | |
1542 | EXT4_I(inode)->i_reserved_data_blocks); | |
1543 | ext4_msg(sb, KERN_CRIT, "i_reserved_meta_blocks=%u", | |
1693918e | 1544 | EXT4_I(inode)->i_reserved_meta_blocks); |
df22291f AK |
1545 | return; |
1546 | } | |
1547 | ||
64769240 | 1548 | /* |
5a87b7a5 TT |
1549 | * mpage_da_map_and_submit - go through given space, map them |
1550 | * if necessary, and then submit them for I/O | |
64769240 | 1551 | * |
8dc207c0 | 1552 | * @mpd - bh describing space |
64769240 AT |
1553 | * |
1554 | * The function skips space we know is already mapped to disk blocks. | |
1555 | * | |
64769240 | 1556 | */ |
5a87b7a5 | 1557 | static void mpage_da_map_and_submit(struct mpage_da_data *mpd) |
64769240 | 1558 | { |
2ac3b6e0 | 1559 | int err, blks, get_blocks_flags; |
1de3e3df | 1560 | struct ext4_map_blocks map, *mapp = NULL; |
2fa3cdfb TT |
1561 | sector_t next = mpd->b_blocknr; |
1562 | unsigned max_blocks = mpd->b_size >> mpd->inode->i_blkbits; | |
1563 | loff_t disksize = EXT4_I(mpd->inode)->i_disksize; | |
1564 | handle_t *handle = NULL; | |
64769240 AT |
1565 | |
1566 | /* | |
5a87b7a5 TT |
1567 | * If the blocks are mapped already, or we couldn't accumulate |
1568 | * any blocks, then proceed immediately to the submission stage. | |
2fa3cdfb | 1569 | */ |
5a87b7a5 TT |
1570 | if ((mpd->b_size == 0) || |
1571 | ((mpd->b_state & (1 << BH_Mapped)) && | |
1572 | !(mpd->b_state & (1 << BH_Delay)) && | |
1573 | !(mpd->b_state & (1 << BH_Unwritten)))) | |
1574 | goto submit_io; | |
2fa3cdfb TT |
1575 | |
1576 | handle = ext4_journal_current_handle(); | |
1577 | BUG_ON(!handle); | |
1578 | ||
79ffab34 | 1579 | /* |
79e83036 | 1580 | * Call ext4_map_blocks() to allocate any delayed allocation |
2ac3b6e0 TT |
1581 | * blocks, or to convert an uninitialized extent to be |
1582 | * initialized (in the case where we have written into | |
1583 | * one or more preallocated blocks). | |
1584 | * | |
1585 | * We pass in the magic EXT4_GET_BLOCKS_DELALLOC_RESERVE to | |
1586 | * indicate that we are on the delayed allocation path. This | |
1587 | * affects functions in many different parts of the allocation | |
1588 | * call path. This flag exists primarily because we don't | |
79e83036 | 1589 | * want to change *many* call functions, so ext4_map_blocks() |
f2321097 | 1590 | * will set the EXT4_STATE_DELALLOC_RESERVED flag once the |
2ac3b6e0 TT |
1591 | * inode's allocation semaphore is taken. |
1592 | * | |
1593 | * If the blocks in questions were delalloc blocks, set | |
1594 | * EXT4_GET_BLOCKS_DELALLOC_RESERVE so the delalloc accounting | |
1595 | * variables are updated after the blocks have been allocated. | |
79ffab34 | 1596 | */ |
2ed88685 TT |
1597 | map.m_lblk = next; |
1598 | map.m_len = max_blocks; | |
1296cc85 | 1599 | get_blocks_flags = EXT4_GET_BLOCKS_CREATE; |
744692dc JZ |
1600 | if (ext4_should_dioread_nolock(mpd->inode)) |
1601 | get_blocks_flags |= EXT4_GET_BLOCKS_IO_CREATE_EXT; | |
2ac3b6e0 | 1602 | if (mpd->b_state & (1 << BH_Delay)) |
1296cc85 AK |
1603 | get_blocks_flags |= EXT4_GET_BLOCKS_DELALLOC_RESERVE; |
1604 | ||
2ed88685 | 1605 | blks = ext4_map_blocks(handle, mpd->inode, &map, get_blocks_flags); |
2fa3cdfb | 1606 | if (blks < 0) { |
e3570639 ES |
1607 | struct super_block *sb = mpd->inode->i_sb; |
1608 | ||
2fa3cdfb | 1609 | err = blks; |
ed5bde0b | 1610 | /* |
5a87b7a5 | 1611 | * If get block returns EAGAIN or ENOSPC and there |
97498956 TT |
1612 | * appears to be free blocks we will just let |
1613 | * mpage_da_submit_io() unlock all of the pages. | |
c4a0c46e AK |
1614 | */ |
1615 | if (err == -EAGAIN) | |
5a87b7a5 | 1616 | goto submit_io; |
df22291f | 1617 | |
5dee5437 | 1618 | if (err == -ENOSPC && ext4_count_free_clusters(sb)) { |
df22291f | 1619 | mpd->retval = err; |
5a87b7a5 | 1620 | goto submit_io; |
df22291f AK |
1621 | } |
1622 | ||
c4a0c46e | 1623 | /* |
ed5bde0b TT |
1624 | * get block failure will cause us to loop in |
1625 | * writepages, because a_ops->writepage won't be able | |
1626 | * to make progress. The page will be redirtied by | |
1627 | * writepage and writepages will again try to write | |
1628 | * the same. | |
c4a0c46e | 1629 | */ |
e3570639 ES |
1630 | if (!(EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED)) { |
1631 | ext4_msg(sb, KERN_CRIT, | |
1632 | "delayed block allocation failed for inode %lu " | |
1633 | "at logical offset %llu with max blocks %zd " | |
1634 | "with error %d", mpd->inode->i_ino, | |
1635 | (unsigned long long) next, | |
1636 | mpd->b_size >> mpd->inode->i_blkbits, err); | |
1637 | ext4_msg(sb, KERN_CRIT, | |
1638 | "This should not happen!! Data will be lost\n"); | |
1639 | if (err == -ENOSPC) | |
1640 | ext4_print_free_blocks(mpd->inode); | |
030ba6bc | 1641 | } |
2fa3cdfb | 1642 | /* invalidate all the pages */ |
c7f5938a | 1643 | ext4_da_block_invalidatepages(mpd); |
e0fd9b90 CW |
1644 | |
1645 | /* Mark this page range as having been completed */ | |
1646 | mpd->io_done = 1; | |
5a87b7a5 | 1647 | return; |
c4a0c46e | 1648 | } |
2fa3cdfb TT |
1649 | BUG_ON(blks == 0); |
1650 | ||
1de3e3df | 1651 | mapp = ↦ |
2ed88685 TT |
1652 | if (map.m_flags & EXT4_MAP_NEW) { |
1653 | struct block_device *bdev = mpd->inode->i_sb->s_bdev; | |
1654 | int i; | |
64769240 | 1655 | |
2ed88685 TT |
1656 | for (i = 0; i < map.m_len; i++) |
1657 | unmap_underlying_metadata(bdev, map.m_pblk + i); | |
2fa3cdfb TT |
1658 | } |
1659 | ||
1660 | /* | |
03f5d8bc | 1661 | * Update on-disk size along with block allocation. |
2fa3cdfb TT |
1662 | */ |
1663 | disksize = ((loff_t) next + blks) << mpd->inode->i_blkbits; | |
1664 | if (disksize > i_size_read(mpd->inode)) | |
1665 | disksize = i_size_read(mpd->inode); | |
1666 | if (disksize > EXT4_I(mpd->inode)->i_disksize) { | |
1667 | ext4_update_i_disksize(mpd->inode, disksize); | |
5a87b7a5 TT |
1668 | err = ext4_mark_inode_dirty(handle, mpd->inode); |
1669 | if (err) | |
1670 | ext4_error(mpd->inode->i_sb, | |
1671 | "Failed to mark inode %lu dirty", | |
1672 | mpd->inode->i_ino); | |
2fa3cdfb TT |
1673 | } |
1674 | ||
5a87b7a5 | 1675 | submit_io: |
1de3e3df | 1676 | mpage_da_submit_io(mpd, mapp); |
5a87b7a5 | 1677 | mpd->io_done = 1; |
64769240 AT |
1678 | } |
1679 | ||
bf068ee2 AK |
1680 | #define BH_FLAGS ((1 << BH_Uptodate) | (1 << BH_Mapped) | \ |
1681 | (1 << BH_Delay) | (1 << BH_Unwritten)) | |
64769240 AT |
1682 | |
1683 | /* | |
1684 | * mpage_add_bh_to_extent - try to add one more block to extent of blocks | |
1685 | * | |
1686 | * @mpd->lbh - extent of blocks | |
1687 | * @logical - logical number of the block in the file | |
1688 | * @bh - bh of the block (used to access block's state) | |
1689 | * | |
1690 | * the function is used to collect contig. blocks in same state | |
1691 | */ | |
1692 | static void mpage_add_bh_to_extent(struct mpage_da_data *mpd, | |
8dc207c0 TT |
1693 | sector_t logical, size_t b_size, |
1694 | unsigned long b_state) | |
64769240 | 1695 | { |
64769240 | 1696 | sector_t next; |
8dc207c0 | 1697 | int nrblocks = mpd->b_size >> mpd->inode->i_blkbits; |
64769240 | 1698 | |
c445e3e0 ES |
1699 | /* |
1700 | * XXX Don't go larger than mballoc is willing to allocate | |
1701 | * This is a stopgap solution. We eventually need to fold | |
1702 | * mpage_da_submit_io() into this function and then call | |
79e83036 | 1703 | * ext4_map_blocks() multiple times in a loop |
c445e3e0 ES |
1704 | */ |
1705 | if (nrblocks >= 8*1024*1024/mpd->inode->i_sb->s_blocksize) | |
1706 | goto flush_it; | |
1707 | ||
525f4ed8 | 1708 | /* check if thereserved journal credits might overflow */ |
12e9b892 | 1709 | if (!(ext4_test_inode_flag(mpd->inode, EXT4_INODE_EXTENTS))) { |
525f4ed8 MC |
1710 | if (nrblocks >= EXT4_MAX_TRANS_DATA) { |
1711 | /* | |
1712 | * With non-extent format we are limited by the journal | |
1713 | * credit available. Total credit needed to insert | |
1714 | * nrblocks contiguous blocks is dependent on the | |
1715 | * nrblocks. So limit nrblocks. | |
1716 | */ | |
1717 | goto flush_it; | |
1718 | } else if ((nrblocks + (b_size >> mpd->inode->i_blkbits)) > | |
1719 | EXT4_MAX_TRANS_DATA) { | |
1720 | /* | |
1721 | * Adding the new buffer_head would make it cross the | |
1722 | * allowed limit for which we have journal credit | |
1723 | * reserved. So limit the new bh->b_size | |
1724 | */ | |
1725 | b_size = (EXT4_MAX_TRANS_DATA - nrblocks) << | |
1726 | mpd->inode->i_blkbits; | |
1727 | /* we will do mpage_da_submit_io in the next loop */ | |
1728 | } | |
1729 | } | |
64769240 AT |
1730 | /* |
1731 | * First block in the extent | |
1732 | */ | |
8dc207c0 TT |
1733 | if (mpd->b_size == 0) { |
1734 | mpd->b_blocknr = logical; | |
1735 | mpd->b_size = b_size; | |
1736 | mpd->b_state = b_state & BH_FLAGS; | |
64769240 AT |
1737 | return; |
1738 | } | |
1739 | ||
8dc207c0 | 1740 | next = mpd->b_blocknr + nrblocks; |
64769240 AT |
1741 | /* |
1742 | * Can we merge the block to our big extent? | |
1743 | */ | |
8dc207c0 TT |
1744 | if (logical == next && (b_state & BH_FLAGS) == mpd->b_state) { |
1745 | mpd->b_size += b_size; | |
64769240 AT |
1746 | return; |
1747 | } | |
1748 | ||
525f4ed8 | 1749 | flush_it: |
64769240 AT |
1750 | /* |
1751 | * We couldn't merge the block to our extent, so we | |
1752 | * need to flush current extent and start new one | |
1753 | */ | |
5a87b7a5 | 1754 | mpage_da_map_and_submit(mpd); |
a1d6cc56 | 1755 | return; |
64769240 AT |
1756 | } |
1757 | ||
c364b22c | 1758 | static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh) |
29fa89d0 | 1759 | { |
c364b22c | 1760 | return (buffer_delay(bh) || buffer_unwritten(bh)) && buffer_dirty(bh); |
29fa89d0 AK |
1761 | } |
1762 | ||
5356f261 AK |
1763 | /* |
1764 | * This function is grabs code from the very beginning of | |
1765 | * ext4_map_blocks, but assumes that the caller is from delayed write | |
1766 | * time. This function looks up the requested blocks and sets the | |
1767 | * buffer delay bit under the protection of i_data_sem. | |
1768 | */ | |
1769 | static int ext4_da_map_blocks(struct inode *inode, sector_t iblock, | |
1770 | struct ext4_map_blocks *map, | |
1771 | struct buffer_head *bh) | |
1772 | { | |
1773 | int retval; | |
1774 | sector_t invalid_block = ~((sector_t) 0xffff); | |
1775 | ||
1776 | if (invalid_block < ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es)) | |
1777 | invalid_block = ~0; | |
1778 | ||
1779 | map->m_flags = 0; | |
1780 | ext_debug("ext4_da_map_blocks(): inode %lu, max_blocks %u," | |
1781 | "logical block %lu\n", inode->i_ino, map->m_len, | |
1782 | (unsigned long) map->m_lblk); | |
1783 | /* | |
1784 | * Try to see if we can get the block without requesting a new | |
1785 | * file system block. | |
1786 | */ | |
1787 | down_read((&EXT4_I(inode)->i_data_sem)); | |
1788 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) | |
1789 | retval = ext4_ext_map_blocks(NULL, inode, map, 0); | |
1790 | else | |
1791 | retval = ext4_ind_map_blocks(NULL, inode, map, 0); | |
1792 | ||
1793 | if (retval == 0) { | |
1794 | /* | |
1795 | * XXX: __block_prepare_write() unmaps passed block, | |
1796 | * is it OK? | |
1797 | */ | |
1798 | /* If the block was allocated from previously allocated cluster, | |
1799 | * then we dont need to reserve it again. */ | |
1800 | if (!(map->m_flags & EXT4_MAP_FROM_CLUSTER)) { | |
1801 | retval = ext4_da_reserve_space(inode, iblock); | |
1802 | if (retval) | |
1803 | /* not enough space to reserve */ | |
1804 | goto out_unlock; | |
1805 | } | |
1806 | ||
51865fda ZL |
1807 | retval = ext4_es_insert_extent(inode, map->m_lblk, map->m_len); |
1808 | if (retval) | |
1809 | goto out_unlock; | |
1810 | ||
5356f261 AK |
1811 | /* Clear EXT4_MAP_FROM_CLUSTER flag since its purpose is served |
1812 | * and it should not appear on the bh->b_state. | |
1813 | */ | |
1814 | map->m_flags &= ~EXT4_MAP_FROM_CLUSTER; | |
1815 | ||
1816 | map_bh(bh, inode->i_sb, invalid_block); | |
1817 | set_buffer_new(bh); | |
1818 | set_buffer_delay(bh); | |
1819 | } | |
1820 | ||
1821 | out_unlock: | |
1822 | up_read((&EXT4_I(inode)->i_data_sem)); | |
1823 | ||
1824 | return retval; | |
1825 | } | |
1826 | ||
64769240 | 1827 | /* |
b920c755 TT |
1828 | * This is a special get_blocks_t callback which is used by |
1829 | * ext4_da_write_begin(). It will either return mapped block or | |
1830 | * reserve space for a single block. | |
29fa89d0 AK |
1831 | * |
1832 | * For delayed buffer_head we have BH_Mapped, BH_New, BH_Delay set. | |
1833 | * We also have b_blocknr = -1 and b_bdev initialized properly | |
1834 | * | |
1835 | * For unwritten buffer_head we have BH_Mapped, BH_New, BH_Unwritten set. | |
1836 | * We also have b_blocknr = physicalblock mapping unwritten extent and b_bdev | |
1837 | * initialized properly. | |
64769240 AT |
1838 | */ |
1839 | static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, | |
2ed88685 | 1840 | struct buffer_head *bh, int create) |
64769240 | 1841 | { |
2ed88685 | 1842 | struct ext4_map_blocks map; |
64769240 AT |
1843 | int ret = 0; |
1844 | ||
1845 | BUG_ON(create == 0); | |
2ed88685 TT |
1846 | BUG_ON(bh->b_size != inode->i_sb->s_blocksize); |
1847 | ||
1848 | map.m_lblk = iblock; | |
1849 | map.m_len = 1; | |
64769240 AT |
1850 | |
1851 | /* | |
1852 | * first, we need to know whether the block is allocated already | |
1853 | * preallocated blocks are unmapped but should treated | |
1854 | * the same as allocated blocks. | |
1855 | */ | |
5356f261 AK |
1856 | ret = ext4_da_map_blocks(inode, iblock, &map, bh); |
1857 | if (ret <= 0) | |
2ed88685 | 1858 | return ret; |
64769240 | 1859 | |
2ed88685 TT |
1860 | map_bh(bh, inode->i_sb, map.m_pblk); |
1861 | bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags; | |
1862 | ||
1863 | if (buffer_unwritten(bh)) { | |
1864 | /* A delayed write to unwritten bh should be marked | |
1865 | * new and mapped. Mapped ensures that we don't do | |
1866 | * get_block multiple times when we write to the same | |
1867 | * offset and new ensures that we do proper zero out | |
1868 | * for partial write. | |
1869 | */ | |
1870 | set_buffer_new(bh); | |
c8205636 | 1871 | set_buffer_mapped(bh); |
2ed88685 TT |
1872 | } |
1873 | return 0; | |
64769240 | 1874 | } |
61628a3f | 1875 | |
b920c755 TT |
1876 | /* |
1877 | * This function is used as a standard get_block_t calback function | |
1878 | * when there is no desire to allocate any blocks. It is used as a | |
ebdec241 | 1879 | * callback function for block_write_begin() and block_write_full_page(). |
206f7ab4 | 1880 | * These functions should only try to map a single block at a time. |
b920c755 TT |
1881 | * |
1882 | * Since this function doesn't do block allocations even if the caller | |
1883 | * requests it by passing in create=1, it is critically important that | |
1884 | * any caller checks to make sure that any buffer heads are returned | |
1885 | * by this function are either all already mapped or marked for | |
206f7ab4 CH |
1886 | * delayed allocation before calling block_write_full_page(). Otherwise, |
1887 | * b_blocknr could be left unitialized, and the page write functions will | |
1888 | * be taken by surprise. | |
b920c755 TT |
1889 | */ |
1890 | static int noalloc_get_block_write(struct inode *inode, sector_t iblock, | |
f0e6c985 AK |
1891 | struct buffer_head *bh_result, int create) |
1892 | { | |
a2dc52b5 | 1893 | BUG_ON(bh_result->b_size != inode->i_sb->s_blocksize); |
2ed88685 | 1894 | return _ext4_get_block(inode, iblock, bh_result, 0); |
61628a3f MC |
1895 | } |
1896 | ||
62e086be AK |
1897 | static int bget_one(handle_t *handle, struct buffer_head *bh) |
1898 | { | |
1899 | get_bh(bh); | |
1900 | return 0; | |
1901 | } | |
1902 | ||
1903 | static int bput_one(handle_t *handle, struct buffer_head *bh) | |
1904 | { | |
1905 | put_bh(bh); | |
1906 | return 0; | |
1907 | } | |
1908 | ||
1909 | static int __ext4_journalled_writepage(struct page *page, | |
62e086be AK |
1910 | unsigned int len) |
1911 | { | |
1912 | struct address_space *mapping = page->mapping; | |
1913 | struct inode *inode = mapping->host; | |
1914 | struct buffer_head *page_bufs; | |
1915 | handle_t *handle = NULL; | |
1916 | int ret = 0; | |
1917 | int err; | |
1918 | ||
cb20d518 | 1919 | ClearPageChecked(page); |
62e086be AK |
1920 | page_bufs = page_buffers(page); |
1921 | BUG_ON(!page_bufs); | |
f19d5870 | 1922 | ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL, bget_one); |
62e086be AK |
1923 | /* As soon as we unlock the page, it can go away, but we have |
1924 | * references to buffers so we are safe */ | |
1925 | unlock_page(page); | |
1926 | ||
1927 | handle = ext4_journal_start(inode, ext4_writepage_trans_blocks(inode)); | |
1928 | if (IS_ERR(handle)) { | |
1929 | ret = PTR_ERR(handle); | |
1930 | goto out; | |
1931 | } | |
1932 | ||
441c8508 CW |
1933 | BUG_ON(!ext4_handle_valid(handle)); |
1934 | ||
f19d5870 TM |
1935 | ret = ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL, |
1936 | do_journal_get_write_access); | |
62e086be | 1937 | |
f19d5870 TM |
1938 | err = ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL, |
1939 | write_end_fn); | |
62e086be AK |
1940 | if (ret == 0) |
1941 | ret = err; | |
2d859db3 | 1942 | EXT4_I(inode)->i_datasync_tid = handle->h_transaction->t_tid; |
62e086be AK |
1943 | err = ext4_journal_stop(handle); |
1944 | if (!ret) | |
1945 | ret = err; | |
1946 | ||
f19d5870 | 1947 | ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL, bput_one); |
19f5fb7a | 1948 | ext4_set_inode_state(inode, EXT4_STATE_JDATA); |
62e086be AK |
1949 | out: |
1950 | return ret; | |
1951 | } | |
1952 | ||
61628a3f | 1953 | /* |
43ce1d23 AK |
1954 | * Note that we don't need to start a transaction unless we're journaling data |
1955 | * because we should have holes filled from ext4_page_mkwrite(). We even don't | |
1956 | * need to file the inode to the transaction's list in ordered mode because if | |
1957 | * we are writing back data added by write(), the inode is already there and if | |
25985edc | 1958 | * we are writing back data modified via mmap(), no one guarantees in which |
43ce1d23 AK |
1959 | * transaction the data will hit the disk. In case we are journaling data, we |
1960 | * cannot start transaction directly because transaction start ranks above page | |
1961 | * lock so we have to do some magic. | |
1962 | * | |
b920c755 TT |
1963 | * This function can get called via... |
1964 | * - ext4_da_writepages after taking page lock (have journal handle) | |
1965 | * - journal_submit_inode_data_buffers (no journal handle) | |
f6463b0d | 1966 | * - shrink_page_list via the kswapd/direct reclaim (no journal handle) |
b920c755 | 1967 | * - grab_page_cache when doing write_begin (have journal handle) |
43ce1d23 AK |
1968 | * |
1969 | * We don't do any block allocation in this function. If we have page with | |
1970 | * multiple blocks we need to write those buffer_heads that are mapped. This | |
1971 | * is important for mmaped based write. So if we do with blocksize 1K | |
1972 | * truncate(f, 1024); | |
1973 | * a = mmap(f, 0, 4096); | |
1974 | * a[0] = 'a'; | |
1975 | * truncate(f, 4096); | |
1976 | * we have in the page first buffer_head mapped via page_mkwrite call back | |
90802ed9 | 1977 | * but other buffer_heads would be unmapped but dirty (dirty done via the |
43ce1d23 AK |
1978 | * do_wp_page). So writepage should write the first block. If we modify |
1979 | * the mmap area beyond 1024 we will again get a page_fault and the | |
1980 | * page_mkwrite callback will do the block allocation and mark the | |
1981 | * buffer_heads mapped. | |
1982 | * | |
1983 | * We redirty the page if we have any buffer_heads that is either delay or | |
1984 | * unwritten in the page. | |
1985 | * | |
1986 | * We can get recursively called as show below. | |
1987 | * | |
1988 | * ext4_writepage() -> kmalloc() -> __alloc_pages() -> page_launder() -> | |
1989 | * ext4_writepage() | |
1990 | * | |
1991 | * But since we don't do any block allocation we should not deadlock. | |
1992 | * Page also have the dirty flag cleared so we don't get recurive page_lock. | |
61628a3f | 1993 | */ |
43ce1d23 | 1994 | static int ext4_writepage(struct page *page, |
62e086be | 1995 | struct writeback_control *wbc) |
64769240 | 1996 | { |
a42afc5f | 1997 | int ret = 0, commit_write = 0; |
61628a3f | 1998 | loff_t size; |
498e5f24 | 1999 | unsigned int len; |
744692dc | 2000 | struct buffer_head *page_bufs = NULL; |
61628a3f MC |
2001 | struct inode *inode = page->mapping->host; |
2002 | ||
a9c667f8 | 2003 | trace_ext4_writepage(page); |
f0e6c985 AK |
2004 | size = i_size_read(inode); |
2005 | if (page->index == size >> PAGE_CACHE_SHIFT) | |
2006 | len = size & ~PAGE_CACHE_MASK; | |
2007 | else | |
2008 | len = PAGE_CACHE_SIZE; | |
64769240 | 2009 | |
a42afc5f TT |
2010 | /* |
2011 | * If the page does not have buffers (for whatever reason), | |
a107e5a3 | 2012 | * try to create them using __block_write_begin. If this |
a42afc5f TT |
2013 | * fails, redirty the page and move on. |
2014 | */ | |
b1142e8f | 2015 | if (!page_has_buffers(page)) { |
a107e5a3 | 2016 | if (__block_write_begin(page, 0, len, |
a42afc5f TT |
2017 | noalloc_get_block_write)) { |
2018 | redirty_page: | |
f0e6c985 AK |
2019 | redirty_page_for_writepage(wbc, page); |
2020 | unlock_page(page); | |
2021 | return 0; | |
2022 | } | |
a42afc5f TT |
2023 | commit_write = 1; |
2024 | } | |
2025 | page_bufs = page_buffers(page); | |
f19d5870 TM |
2026 | if (ext4_walk_page_buffers(NULL, page_bufs, 0, len, NULL, |
2027 | ext4_bh_delay_or_unwritten)) { | |
f0e6c985 | 2028 | /* |
b1142e8f TT |
2029 | * We don't want to do block allocation, so redirty |
2030 | * the page and return. We may reach here when we do | |
2031 | * a journal commit via journal_submit_inode_data_buffers. | |
966dbde2 MG |
2032 | * We can also reach here via shrink_page_list but it |
2033 | * should never be for direct reclaim so warn if that | |
2034 | * happens | |
f0e6c985 | 2035 | */ |
966dbde2 MG |
2036 | WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) == |
2037 | PF_MEMALLOC); | |
a42afc5f TT |
2038 | goto redirty_page; |
2039 | } | |
2040 | if (commit_write) | |
ed9b3e33 | 2041 | /* now mark the buffer_heads as dirty and uptodate */ |
b767e78a | 2042 | block_commit_write(page, 0, len); |
64769240 | 2043 | |
cb20d518 | 2044 | if (PageChecked(page) && ext4_should_journal_data(inode)) |
43ce1d23 AK |
2045 | /* |
2046 | * It's mmapped pagecache. Add buffers and journal it. There | |
2047 | * doesn't seem much point in redirtying the page here. | |
2048 | */ | |
3f0ca309 | 2049 | return __ext4_journalled_writepage(page, len); |
43ce1d23 | 2050 | |
a42afc5f | 2051 | if (buffer_uninit(page_bufs)) { |
744692dc JZ |
2052 | ext4_set_bh_endio(page_bufs, inode); |
2053 | ret = block_write_full_page_endio(page, noalloc_get_block_write, | |
2054 | wbc, ext4_end_io_buffer_write); | |
2055 | } else | |
b920c755 TT |
2056 | ret = block_write_full_page(page, noalloc_get_block_write, |
2057 | wbc); | |
64769240 | 2058 | |
64769240 AT |
2059 | return ret; |
2060 | } | |
2061 | ||
61628a3f | 2062 | /* |
525f4ed8 | 2063 | * This is called via ext4_da_writepages() to |
25985edc | 2064 | * calculate the total number of credits to reserve to fit |
525f4ed8 MC |
2065 | * a single extent allocation into a single transaction, |
2066 | * ext4_da_writpeages() will loop calling this before | |
2067 | * the block allocation. | |
61628a3f | 2068 | */ |
525f4ed8 MC |
2069 | |
2070 | static int ext4_da_writepages_trans_blocks(struct inode *inode) | |
2071 | { | |
2072 | int max_blocks = EXT4_I(inode)->i_reserved_data_blocks; | |
2073 | ||
2074 | /* | |
2075 | * With non-extent format the journal credit needed to | |
2076 | * insert nrblocks contiguous block is dependent on | |
2077 | * number of contiguous block. So we will limit | |
2078 | * number of contiguous block to a sane value | |
2079 | */ | |
12e9b892 | 2080 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) && |
525f4ed8 MC |
2081 | (max_blocks > EXT4_MAX_TRANS_DATA)) |
2082 | max_blocks = EXT4_MAX_TRANS_DATA; | |
2083 | ||
2084 | return ext4_chunk_trans_blocks(inode, max_blocks); | |
2085 | } | |
61628a3f | 2086 | |
8e48dcfb TT |
2087 | /* |
2088 | * write_cache_pages_da - walk the list of dirty pages of the given | |
8eb9e5ce | 2089 | * address space and accumulate pages that need writing, and call |
168fc022 TT |
2090 | * mpage_da_map_and_submit to map a single contiguous memory region |
2091 | * and then write them. | |
8e48dcfb TT |
2092 | */ |
2093 | static int write_cache_pages_da(struct address_space *mapping, | |
2094 | struct writeback_control *wbc, | |
72f84e65 ES |
2095 | struct mpage_da_data *mpd, |
2096 | pgoff_t *done_index) | |
8e48dcfb | 2097 | { |
4f01b02c | 2098 | struct buffer_head *bh, *head; |
168fc022 | 2099 | struct inode *inode = mapping->host; |
4f01b02c TT |
2100 | struct pagevec pvec; |
2101 | unsigned int nr_pages; | |
2102 | sector_t logical; | |
2103 | pgoff_t index, end; | |
2104 | long nr_to_write = wbc->nr_to_write; | |
2105 | int i, tag, ret = 0; | |
8e48dcfb | 2106 | |
168fc022 TT |
2107 | memset(mpd, 0, sizeof(struct mpage_da_data)); |
2108 | mpd->wbc = wbc; | |
2109 | mpd->inode = inode; | |
8e48dcfb TT |
2110 | pagevec_init(&pvec, 0); |
2111 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
2112 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
2113 | ||
6e6938b6 | 2114 | if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) |
5b41d924 ES |
2115 | tag = PAGECACHE_TAG_TOWRITE; |
2116 | else | |
2117 | tag = PAGECACHE_TAG_DIRTY; | |
2118 | ||
72f84e65 | 2119 | *done_index = index; |
4f01b02c | 2120 | while (index <= end) { |
5b41d924 | 2121 | nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
8e48dcfb TT |
2122 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1); |
2123 | if (nr_pages == 0) | |
4f01b02c | 2124 | return 0; |
8e48dcfb TT |
2125 | |
2126 | for (i = 0; i < nr_pages; i++) { | |
2127 | struct page *page = pvec.pages[i]; | |
2128 | ||
2129 | /* | |
2130 | * At this point, the page may be truncated or | |
2131 | * invalidated (changing page->mapping to NULL), or | |
2132 | * even swizzled back from swapper_space to tmpfs file | |
2133 | * mapping. However, page->index will not change | |
2134 | * because we have a reference on the page. | |
2135 | */ | |
4f01b02c TT |
2136 | if (page->index > end) |
2137 | goto out; | |
8e48dcfb | 2138 | |
72f84e65 ES |
2139 | *done_index = page->index + 1; |
2140 | ||
78aaced3 TT |
2141 | /* |
2142 | * If we can't merge this page, and we have | |
2143 | * accumulated an contiguous region, write it | |
2144 | */ | |
2145 | if ((mpd->next_page != page->index) && | |
2146 | (mpd->next_page != mpd->first_page)) { | |
2147 | mpage_da_map_and_submit(mpd); | |
2148 | goto ret_extent_tail; | |
2149 | } | |
2150 | ||
8e48dcfb TT |
2151 | lock_page(page); |
2152 | ||
2153 | /* | |
4f01b02c TT |
2154 | * If the page is no longer dirty, or its |
2155 | * mapping no longer corresponds to inode we | |
2156 | * are writing (which means it has been | |
2157 | * truncated or invalidated), or the page is | |
2158 | * already under writeback and we are not | |
2159 | * doing a data integrity writeback, skip the page | |
8e48dcfb | 2160 | */ |
4f01b02c TT |
2161 | if (!PageDirty(page) || |
2162 | (PageWriteback(page) && | |
2163 | (wbc->sync_mode == WB_SYNC_NONE)) || | |
2164 | unlikely(page->mapping != mapping)) { | |
8e48dcfb TT |
2165 | unlock_page(page); |
2166 | continue; | |
2167 | } | |
2168 | ||
7cb1a535 | 2169 | wait_on_page_writeback(page); |
8e48dcfb | 2170 | BUG_ON(PageWriteback(page)); |
8e48dcfb | 2171 | |
168fc022 | 2172 | if (mpd->next_page != page->index) |
8eb9e5ce | 2173 | mpd->first_page = page->index; |
8eb9e5ce TT |
2174 | mpd->next_page = page->index + 1; |
2175 | logical = (sector_t) page->index << | |
2176 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
2177 | ||
2178 | if (!page_has_buffers(page)) { | |
4f01b02c TT |
2179 | mpage_add_bh_to_extent(mpd, logical, |
2180 | PAGE_CACHE_SIZE, | |
8eb9e5ce | 2181 | (1 << BH_Dirty) | (1 << BH_Uptodate)); |
4f01b02c TT |
2182 | if (mpd->io_done) |
2183 | goto ret_extent_tail; | |
8eb9e5ce TT |
2184 | } else { |
2185 | /* | |
4f01b02c TT |
2186 | * Page with regular buffer heads, |
2187 | * just add all dirty ones | |
8eb9e5ce TT |
2188 | */ |
2189 | head = page_buffers(page); | |
2190 | bh = head; | |
2191 | do { | |
2192 | BUG_ON(buffer_locked(bh)); | |
2193 | /* | |
2194 | * We need to try to allocate | |
2195 | * unmapped blocks in the same page. | |
2196 | * Otherwise we won't make progress | |
2197 | * with the page in ext4_writepage | |
2198 | */ | |
2199 | if (ext4_bh_delay_or_unwritten(NULL, bh)) { | |
2200 | mpage_add_bh_to_extent(mpd, logical, | |
2201 | bh->b_size, | |
2202 | bh->b_state); | |
4f01b02c TT |
2203 | if (mpd->io_done) |
2204 | goto ret_extent_tail; | |
8eb9e5ce TT |
2205 | } else if (buffer_dirty(bh) && (buffer_mapped(bh))) { |
2206 | /* | |
4f01b02c TT |
2207 | * mapped dirty buffer. We need |
2208 | * to update the b_state | |
2209 | * because we look at b_state | |
2210 | * in mpage_da_map_blocks. We | |
2211 | * don't update b_size because | |
2212 | * if we find an unmapped | |
2213 | * buffer_head later we need to | |
2214 | * use the b_state flag of that | |
2215 | * buffer_head. | |
8eb9e5ce TT |
2216 | */ |
2217 | if (mpd->b_size == 0) | |
2218 | mpd->b_state = bh->b_state & BH_FLAGS; | |
2219 | } | |
2220 | logical++; | |
2221 | } while ((bh = bh->b_this_page) != head); | |
8e48dcfb TT |
2222 | } |
2223 | ||
2224 | if (nr_to_write > 0) { | |
2225 | nr_to_write--; | |
2226 | if (nr_to_write == 0 && | |
4f01b02c | 2227 | wbc->sync_mode == WB_SYNC_NONE) |
8e48dcfb TT |
2228 | /* |
2229 | * We stop writing back only if we are | |
2230 | * not doing integrity sync. In case of | |
2231 | * integrity sync we have to keep going | |
2232 | * because someone may be concurrently | |
2233 | * dirtying pages, and we might have | |
2234 | * synced a lot of newly appeared dirty | |
2235 | * pages, but have not synced all of the | |
2236 | * old dirty pages. | |
2237 | */ | |
4f01b02c | 2238 | goto out; |
8e48dcfb TT |
2239 | } |
2240 | } | |
2241 | pagevec_release(&pvec); | |
2242 | cond_resched(); | |
2243 | } | |
4f01b02c TT |
2244 | return 0; |
2245 | ret_extent_tail: | |
2246 | ret = MPAGE_DA_EXTENT_TAIL; | |
8eb9e5ce TT |
2247 | out: |
2248 | pagevec_release(&pvec); | |
2249 | cond_resched(); | |
8e48dcfb TT |
2250 | return ret; |
2251 | } | |
2252 | ||
2253 | ||
64769240 | 2254 | static int ext4_da_writepages(struct address_space *mapping, |
a1d6cc56 | 2255 | struct writeback_control *wbc) |
64769240 | 2256 | { |
22208ded AK |
2257 | pgoff_t index; |
2258 | int range_whole = 0; | |
61628a3f | 2259 | handle_t *handle = NULL; |
df22291f | 2260 | struct mpage_da_data mpd; |
5e745b04 | 2261 | struct inode *inode = mapping->host; |
498e5f24 | 2262 | int pages_written = 0; |
55138e0b | 2263 | unsigned int max_pages; |
2acf2c26 | 2264 | int range_cyclic, cycled = 1, io_done = 0; |
55138e0b TT |
2265 | int needed_blocks, ret = 0; |
2266 | long desired_nr_to_write, nr_to_writebump = 0; | |
de89de6e | 2267 | loff_t range_start = wbc->range_start; |
5e745b04 | 2268 | struct ext4_sb_info *sbi = EXT4_SB(mapping->host->i_sb); |
72f84e65 | 2269 | pgoff_t done_index = 0; |
5b41d924 | 2270 | pgoff_t end; |
1bce63d1 | 2271 | struct blk_plug plug; |
61628a3f | 2272 | |
9bffad1e | 2273 | trace_ext4_da_writepages(inode, wbc); |
ba80b101 | 2274 | |
61628a3f MC |
2275 | /* |
2276 | * No pages to write? This is mainly a kludge to avoid starting | |
2277 | * a transaction for special inodes like journal inode on last iput() | |
2278 | * because that could violate lock ordering on umount | |
2279 | */ | |
a1d6cc56 | 2280 | if (!mapping->nrpages || !mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) |
61628a3f | 2281 | return 0; |
2a21e37e TT |
2282 | |
2283 | /* | |
2284 | * If the filesystem has aborted, it is read-only, so return | |
2285 | * right away instead of dumping stack traces later on that | |
2286 | * will obscure the real source of the problem. We test | |
4ab2f15b | 2287 | * EXT4_MF_FS_ABORTED instead of sb->s_flag's MS_RDONLY because |
2a21e37e TT |
2288 | * the latter could be true if the filesystem is mounted |
2289 | * read-only, and in that case, ext4_da_writepages should | |
2290 | * *never* be called, so if that ever happens, we would want | |
2291 | * the stack trace. | |
2292 | */ | |
4ab2f15b | 2293 | if (unlikely(sbi->s_mount_flags & EXT4_MF_FS_ABORTED)) |
2a21e37e TT |
2294 | return -EROFS; |
2295 | ||
22208ded AK |
2296 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
2297 | range_whole = 1; | |
61628a3f | 2298 | |
2acf2c26 AK |
2299 | range_cyclic = wbc->range_cyclic; |
2300 | if (wbc->range_cyclic) { | |
22208ded | 2301 | index = mapping->writeback_index; |
2acf2c26 AK |
2302 | if (index) |
2303 | cycled = 0; | |
2304 | wbc->range_start = index << PAGE_CACHE_SHIFT; | |
2305 | wbc->range_end = LLONG_MAX; | |
2306 | wbc->range_cyclic = 0; | |
5b41d924 ES |
2307 | end = -1; |
2308 | } else { | |
22208ded | 2309 | index = wbc->range_start >> PAGE_CACHE_SHIFT; |
5b41d924 ES |
2310 | end = wbc->range_end >> PAGE_CACHE_SHIFT; |
2311 | } | |
a1d6cc56 | 2312 | |
55138e0b TT |
2313 | /* |
2314 | * This works around two forms of stupidity. The first is in | |
2315 | * the writeback code, which caps the maximum number of pages | |
2316 | * written to be 1024 pages. This is wrong on multiple | |
2317 | * levels; different architectues have a different page size, | |
2318 | * which changes the maximum amount of data which gets | |
2319 | * written. Secondly, 4 megabytes is way too small. XFS | |
2320 | * forces this value to be 16 megabytes by multiplying | |
2321 | * nr_to_write parameter by four, and then relies on its | |
2322 | * allocator to allocate larger extents to make them | |
2323 | * contiguous. Unfortunately this brings us to the second | |
2324 | * stupidity, which is that ext4's mballoc code only allocates | |
2325 | * at most 2048 blocks. So we force contiguous writes up to | |
2326 | * the number of dirty blocks in the inode, or | |
2327 | * sbi->max_writeback_mb_bump whichever is smaller. | |
2328 | */ | |
2329 | max_pages = sbi->s_max_writeback_mb_bump << (20 - PAGE_CACHE_SHIFT); | |
b443e733 ES |
2330 | if (!range_cyclic && range_whole) { |
2331 | if (wbc->nr_to_write == LONG_MAX) | |
2332 | desired_nr_to_write = wbc->nr_to_write; | |
2333 | else | |
2334 | desired_nr_to_write = wbc->nr_to_write * 8; | |
2335 | } else | |
55138e0b TT |
2336 | desired_nr_to_write = ext4_num_dirty_pages(inode, index, |
2337 | max_pages); | |
2338 | if (desired_nr_to_write > max_pages) | |
2339 | desired_nr_to_write = max_pages; | |
2340 | ||
2341 | if (wbc->nr_to_write < desired_nr_to_write) { | |
2342 | nr_to_writebump = desired_nr_to_write - wbc->nr_to_write; | |
2343 | wbc->nr_to_write = desired_nr_to_write; | |
2344 | } | |
2345 | ||
2acf2c26 | 2346 | retry: |
6e6938b6 | 2347 | if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) |
5b41d924 ES |
2348 | tag_pages_for_writeback(mapping, index, end); |
2349 | ||
1bce63d1 | 2350 | blk_start_plug(&plug); |
22208ded | 2351 | while (!ret && wbc->nr_to_write > 0) { |
a1d6cc56 AK |
2352 | |
2353 | /* | |
2354 | * we insert one extent at a time. So we need | |
2355 | * credit needed for single extent allocation. | |
2356 | * journalled mode is currently not supported | |
2357 | * by delalloc | |
2358 | */ | |
2359 | BUG_ON(ext4_should_journal_data(inode)); | |
525f4ed8 | 2360 | needed_blocks = ext4_da_writepages_trans_blocks(inode); |
a1d6cc56 | 2361 | |
61628a3f MC |
2362 | /* start a new transaction*/ |
2363 | handle = ext4_journal_start(inode, needed_blocks); | |
2364 | if (IS_ERR(handle)) { | |
2365 | ret = PTR_ERR(handle); | |
1693918e | 2366 | ext4_msg(inode->i_sb, KERN_CRIT, "%s: jbd2_start: " |
fbe845dd | 2367 | "%ld pages, ino %lu; err %d", __func__, |
a1d6cc56 | 2368 | wbc->nr_to_write, inode->i_ino, ret); |
3c1fcb2c | 2369 | blk_finish_plug(&plug); |
61628a3f MC |
2370 | goto out_writepages; |
2371 | } | |
f63e6005 TT |
2372 | |
2373 | /* | |
8eb9e5ce | 2374 | * Now call write_cache_pages_da() to find the next |
f63e6005 | 2375 | * contiguous region of logical blocks that need |
8eb9e5ce | 2376 | * blocks to be allocated by ext4 and submit them. |
f63e6005 | 2377 | */ |
72f84e65 | 2378 | ret = write_cache_pages_da(mapping, wbc, &mpd, &done_index); |
f63e6005 | 2379 | /* |
af901ca1 | 2380 | * If we have a contiguous extent of pages and we |
f63e6005 TT |
2381 | * haven't done the I/O yet, map the blocks and submit |
2382 | * them for I/O. | |
2383 | */ | |
2384 | if (!mpd.io_done && mpd.next_page != mpd.first_page) { | |
5a87b7a5 | 2385 | mpage_da_map_and_submit(&mpd); |
f63e6005 TT |
2386 | ret = MPAGE_DA_EXTENT_TAIL; |
2387 | } | |
b3a3ca8c | 2388 | trace_ext4_da_write_pages(inode, &mpd); |
f63e6005 | 2389 | wbc->nr_to_write -= mpd.pages_written; |
df22291f | 2390 | |
61628a3f | 2391 | ext4_journal_stop(handle); |
df22291f | 2392 | |
8f64b32e | 2393 | if ((mpd.retval == -ENOSPC) && sbi->s_journal) { |
22208ded AK |
2394 | /* commit the transaction which would |
2395 | * free blocks released in the transaction | |
2396 | * and try again | |
2397 | */ | |
df22291f | 2398 | jbd2_journal_force_commit_nested(sbi->s_journal); |
22208ded AK |
2399 | ret = 0; |
2400 | } else if (ret == MPAGE_DA_EXTENT_TAIL) { | |
a1d6cc56 | 2401 | /* |
8de49e67 KM |
2402 | * Got one extent now try with rest of the pages. |
2403 | * If mpd.retval is set -EIO, journal is aborted. | |
2404 | * So we don't need to write any more. | |
a1d6cc56 | 2405 | */ |
22208ded | 2406 | pages_written += mpd.pages_written; |
8de49e67 | 2407 | ret = mpd.retval; |
2acf2c26 | 2408 | io_done = 1; |
22208ded | 2409 | } else if (wbc->nr_to_write) |
61628a3f MC |
2410 | /* |
2411 | * There is no more writeout needed | |
2412 | * or we requested for a noblocking writeout | |
2413 | * and we found the device congested | |
2414 | */ | |
61628a3f | 2415 | break; |
a1d6cc56 | 2416 | } |
1bce63d1 | 2417 | blk_finish_plug(&plug); |
2acf2c26 AK |
2418 | if (!io_done && !cycled) { |
2419 | cycled = 1; | |
2420 | index = 0; | |
2421 | wbc->range_start = index << PAGE_CACHE_SHIFT; | |
2422 | wbc->range_end = mapping->writeback_index - 1; | |
2423 | goto retry; | |
2424 | } | |
22208ded AK |
2425 | |
2426 | /* Update index */ | |
2acf2c26 | 2427 | wbc->range_cyclic = range_cyclic; |
22208ded AK |
2428 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
2429 | /* | |
2430 | * set the writeback_index so that range_cyclic | |
2431 | * mode will write it back later | |
2432 | */ | |
72f84e65 | 2433 | mapping->writeback_index = done_index; |
a1d6cc56 | 2434 | |
61628a3f | 2435 | out_writepages: |
2faf2e19 | 2436 | wbc->nr_to_write -= nr_to_writebump; |
de89de6e | 2437 | wbc->range_start = range_start; |
9bffad1e | 2438 | trace_ext4_da_writepages_result(inode, wbc, ret, pages_written); |
61628a3f | 2439 | return ret; |
64769240 AT |
2440 | } |
2441 | ||
79f0be8d AK |
2442 | #define FALL_BACK_TO_NONDELALLOC 1 |
2443 | static int ext4_nonda_switch(struct super_block *sb) | |
2444 | { | |
2445 | s64 free_blocks, dirty_blocks; | |
2446 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
2447 | ||
2448 | /* | |
2449 | * switch to non delalloc mode if we are running low | |
2450 | * on free block. The free block accounting via percpu | |
179f7ebf | 2451 | * counters can get slightly wrong with percpu_counter_batch getting |
79f0be8d AK |
2452 | * accumulated on each CPU without updating global counters |
2453 | * Delalloc need an accurate free block accounting. So switch | |
2454 | * to non delalloc when we are near to error range. | |
2455 | */ | |
57042651 TT |
2456 | free_blocks = EXT4_C2B(sbi, |
2457 | percpu_counter_read_positive(&sbi->s_freeclusters_counter)); | |
2458 | dirty_blocks = percpu_counter_read_positive(&sbi->s_dirtyclusters_counter); | |
00d4e736 TT |
2459 | /* |
2460 | * Start pushing delalloc when 1/2 of free blocks are dirty. | |
2461 | */ | |
2462 | if (dirty_blocks && (free_blocks < 2 * dirty_blocks) && | |
2463 | !writeback_in_progress(sb->s_bdi) && | |
2464 | down_read_trylock(&sb->s_umount)) { | |
2465 | writeback_inodes_sb(sb, WB_REASON_FS_FREE_SPACE); | |
2466 | up_read(&sb->s_umount); | |
2467 | } | |
2468 | ||
79f0be8d | 2469 | if (2 * free_blocks < 3 * dirty_blocks || |
df55c99d | 2470 | free_blocks < (dirty_blocks + EXT4_FREECLUSTERS_WATERMARK)) { |
79f0be8d | 2471 | /* |
c8afb446 ES |
2472 | * free block count is less than 150% of dirty blocks |
2473 | * or free blocks is less than watermark | |
79f0be8d AK |
2474 | */ |
2475 | return 1; | |
2476 | } | |
2477 | return 0; | |
2478 | } | |
2479 | ||
64769240 | 2480 | static int ext4_da_write_begin(struct file *file, struct address_space *mapping, |
de9a55b8 TT |
2481 | loff_t pos, unsigned len, unsigned flags, |
2482 | struct page **pagep, void **fsdata) | |
64769240 | 2483 | { |
72b8ab9d | 2484 | int ret, retries = 0; |
64769240 AT |
2485 | struct page *page; |
2486 | pgoff_t index; | |
64769240 AT |
2487 | struct inode *inode = mapping->host; |
2488 | handle_t *handle; | |
2489 | ||
2490 | index = pos >> PAGE_CACHE_SHIFT; | |
79f0be8d AK |
2491 | |
2492 | if (ext4_nonda_switch(inode->i_sb)) { | |
2493 | *fsdata = (void *)FALL_BACK_TO_NONDELALLOC; | |
2494 | return ext4_write_begin(file, mapping, pos, | |
2495 | len, flags, pagep, fsdata); | |
2496 | } | |
2497 | *fsdata = (void *)0; | |
9bffad1e | 2498 | trace_ext4_da_write_begin(inode, pos, len, flags); |
d2a17637 | 2499 | retry: |
64769240 AT |
2500 | /* |
2501 | * With delayed allocation, we don't log the i_disksize update | |
2502 | * if there is delayed block allocation. But we still need | |
2503 | * to journalling the i_disksize update if writes to the end | |
2504 | * of file which has an already mapped buffer. | |
2505 | */ | |
2506 | handle = ext4_journal_start(inode, 1); | |
2507 | if (IS_ERR(handle)) { | |
2508 | ret = PTR_ERR(handle); | |
2509 | goto out; | |
2510 | } | |
ebd3610b JK |
2511 | /* We cannot recurse into the filesystem as the transaction is already |
2512 | * started */ | |
2513 | flags |= AOP_FLAG_NOFS; | |
64769240 | 2514 | |
54566b2c | 2515 | page = grab_cache_page_write_begin(mapping, index, flags); |
d5a0d4f7 ES |
2516 | if (!page) { |
2517 | ext4_journal_stop(handle); | |
2518 | ret = -ENOMEM; | |
2519 | goto out; | |
2520 | } | |
64769240 AT |
2521 | *pagep = page; |
2522 | ||
6e1db88d | 2523 | ret = __block_write_begin(page, pos, len, ext4_da_get_block_prep); |
64769240 AT |
2524 | if (ret < 0) { |
2525 | unlock_page(page); | |
2526 | ext4_journal_stop(handle); | |
2527 | page_cache_release(page); | |
ae4d5372 AK |
2528 | /* |
2529 | * block_write_begin may have instantiated a few blocks | |
2530 | * outside i_size. Trim these off again. Don't need | |
2531 | * i_size_read because we hold i_mutex. | |
2532 | */ | |
2533 | if (pos + len > inode->i_size) | |
b9a4207d | 2534 | ext4_truncate_failed_write(inode); |
64769240 AT |
2535 | } |
2536 | ||
d2a17637 MC |
2537 | if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) |
2538 | goto retry; | |
64769240 AT |
2539 | out: |
2540 | return ret; | |
2541 | } | |
2542 | ||
632eaeab MC |
2543 | /* |
2544 | * Check if we should update i_disksize | |
2545 | * when write to the end of file but not require block allocation | |
2546 | */ | |
2547 | static int ext4_da_should_update_i_disksize(struct page *page, | |
de9a55b8 | 2548 | unsigned long offset) |
632eaeab MC |
2549 | { |
2550 | struct buffer_head *bh; | |
2551 | struct inode *inode = page->mapping->host; | |
2552 | unsigned int idx; | |
2553 | int i; | |
2554 | ||
2555 | bh = page_buffers(page); | |
2556 | idx = offset >> inode->i_blkbits; | |
2557 | ||
af5bc92d | 2558 | for (i = 0; i < idx; i++) |
632eaeab MC |
2559 | bh = bh->b_this_page; |
2560 | ||
29fa89d0 | 2561 | if (!buffer_mapped(bh) || (buffer_delay(bh)) || buffer_unwritten(bh)) |
632eaeab MC |
2562 | return 0; |
2563 | return 1; | |
2564 | } | |
2565 | ||
64769240 | 2566 | static int ext4_da_write_end(struct file *file, |
de9a55b8 TT |
2567 | struct address_space *mapping, |
2568 | loff_t pos, unsigned len, unsigned copied, | |
2569 | struct page *page, void *fsdata) | |
64769240 AT |
2570 | { |
2571 | struct inode *inode = mapping->host; | |
2572 | int ret = 0, ret2; | |
2573 | handle_t *handle = ext4_journal_current_handle(); | |
2574 | loff_t new_i_size; | |
632eaeab | 2575 | unsigned long start, end; |
79f0be8d AK |
2576 | int write_mode = (int)(unsigned long)fsdata; |
2577 | ||
2578 | if (write_mode == FALL_BACK_TO_NONDELALLOC) { | |
3d2b1582 LC |
2579 | switch (ext4_inode_journal_mode(inode)) { |
2580 | case EXT4_INODE_ORDERED_DATA_MODE: | |
79f0be8d AK |
2581 | return ext4_ordered_write_end(file, mapping, pos, |
2582 | len, copied, page, fsdata); | |
3d2b1582 | 2583 | case EXT4_INODE_WRITEBACK_DATA_MODE: |
79f0be8d AK |
2584 | return ext4_writeback_write_end(file, mapping, pos, |
2585 | len, copied, page, fsdata); | |
3d2b1582 | 2586 | default: |
79f0be8d AK |
2587 | BUG(); |
2588 | } | |
2589 | } | |
632eaeab | 2590 | |
9bffad1e | 2591 | trace_ext4_da_write_end(inode, pos, len, copied); |
632eaeab | 2592 | start = pos & (PAGE_CACHE_SIZE - 1); |
af5bc92d | 2593 | end = start + copied - 1; |
64769240 AT |
2594 | |
2595 | /* | |
2596 | * generic_write_end() will run mark_inode_dirty() if i_size | |
2597 | * changes. So let's piggyback the i_disksize mark_inode_dirty | |
2598 | * into that. | |
2599 | */ | |
2600 | ||
2601 | new_i_size = pos + copied; | |
ea51d132 | 2602 | if (copied && new_i_size > EXT4_I(inode)->i_disksize) { |
632eaeab MC |
2603 | if (ext4_da_should_update_i_disksize(page, end)) { |
2604 | down_write(&EXT4_I(inode)->i_data_sem); | |
f3b59291 | 2605 | if (new_i_size > EXT4_I(inode)->i_disksize) |
632eaeab | 2606 | EXT4_I(inode)->i_disksize = new_i_size; |
632eaeab | 2607 | up_write(&EXT4_I(inode)->i_data_sem); |
cf17fea6 AK |
2608 | /* We need to mark inode dirty even if |
2609 | * new_i_size is less that inode->i_size | |
2610 | * bu greater than i_disksize.(hint delalloc) | |
2611 | */ | |
2612 | ext4_mark_inode_dirty(handle, inode); | |
64769240 | 2613 | } |
632eaeab | 2614 | } |
64769240 AT |
2615 | ret2 = generic_write_end(file, mapping, pos, len, copied, |
2616 | page, fsdata); | |
2617 | copied = ret2; | |
2618 | if (ret2 < 0) | |
2619 | ret = ret2; | |
2620 | ret2 = ext4_journal_stop(handle); | |
2621 | if (!ret) | |
2622 | ret = ret2; | |
2623 | ||
2624 | return ret ? ret : copied; | |
2625 | } | |
2626 | ||
2627 | static void ext4_da_invalidatepage(struct page *page, unsigned long offset) | |
2628 | { | |
64769240 AT |
2629 | /* |
2630 | * Drop reserved blocks | |
2631 | */ | |
2632 | BUG_ON(!PageLocked(page)); | |
2633 | if (!page_has_buffers(page)) | |
2634 | goto out; | |
2635 | ||
d2a17637 | 2636 | ext4_da_page_release_reservation(page, offset); |
64769240 AT |
2637 | |
2638 | out: | |
2639 | ext4_invalidatepage(page, offset); | |
2640 | ||
2641 | return; | |
2642 | } | |
2643 | ||
ccd2506b TT |
2644 | /* |
2645 | * Force all delayed allocation blocks to be allocated for a given inode. | |
2646 | */ | |
2647 | int ext4_alloc_da_blocks(struct inode *inode) | |
2648 | { | |
fb40ba0d TT |
2649 | trace_ext4_alloc_da_blocks(inode); |
2650 | ||
ccd2506b TT |
2651 | if (!EXT4_I(inode)->i_reserved_data_blocks && |
2652 | !EXT4_I(inode)->i_reserved_meta_blocks) | |
2653 | return 0; | |
2654 | ||
2655 | /* | |
2656 | * We do something simple for now. The filemap_flush() will | |
2657 | * also start triggering a write of the data blocks, which is | |
2658 | * not strictly speaking necessary (and for users of | |
2659 | * laptop_mode, not even desirable). However, to do otherwise | |
2660 | * would require replicating code paths in: | |
de9a55b8 | 2661 | * |
ccd2506b TT |
2662 | * ext4_da_writepages() -> |
2663 | * write_cache_pages() ---> (via passed in callback function) | |
2664 | * __mpage_da_writepage() --> | |
2665 | * mpage_add_bh_to_extent() | |
2666 | * mpage_da_map_blocks() | |
2667 | * | |
2668 | * The problem is that write_cache_pages(), located in | |
2669 | * mm/page-writeback.c, marks pages clean in preparation for | |
2670 | * doing I/O, which is not desirable if we're not planning on | |
2671 | * doing I/O at all. | |
2672 | * | |
2673 | * We could call write_cache_pages(), and then redirty all of | |
380cf090 | 2674 | * the pages by calling redirty_page_for_writepage() but that |
ccd2506b TT |
2675 | * would be ugly in the extreme. So instead we would need to |
2676 | * replicate parts of the code in the above functions, | |
25985edc | 2677 | * simplifying them because we wouldn't actually intend to |
ccd2506b TT |
2678 | * write out the pages, but rather only collect contiguous |
2679 | * logical block extents, call the multi-block allocator, and | |
2680 | * then update the buffer heads with the block allocations. | |
de9a55b8 | 2681 | * |
ccd2506b TT |
2682 | * For now, though, we'll cheat by calling filemap_flush(), |
2683 | * which will map the blocks, and start the I/O, but not | |
2684 | * actually wait for the I/O to complete. | |
2685 | */ | |
2686 | return filemap_flush(inode->i_mapping); | |
2687 | } | |
64769240 | 2688 | |
ac27a0ec DK |
2689 | /* |
2690 | * bmap() is special. It gets used by applications such as lilo and by | |
2691 | * the swapper to find the on-disk block of a specific piece of data. | |
2692 | * | |
2693 | * Naturally, this is dangerous if the block concerned is still in the | |
617ba13b | 2694 | * journal. If somebody makes a swapfile on an ext4 data-journaling |
ac27a0ec DK |
2695 | * filesystem and enables swap, then they may get a nasty shock when the |
2696 | * data getting swapped to that swapfile suddenly gets overwritten by | |
2697 | * the original zero's written out previously to the journal and | |
2698 | * awaiting writeback in the kernel's buffer cache. | |
2699 | * | |
2700 | * So, if we see any bmap calls here on a modified, data-journaled file, | |
2701 | * take extra steps to flush any blocks which might be in the cache. | |
2702 | */ | |
617ba13b | 2703 | static sector_t ext4_bmap(struct address_space *mapping, sector_t block) |
ac27a0ec DK |
2704 | { |
2705 | struct inode *inode = mapping->host; | |
2706 | journal_t *journal; | |
2707 | int err; | |
2708 | ||
46c7f254 TM |
2709 | /* |
2710 | * We can get here for an inline file via the FIBMAP ioctl | |
2711 | */ | |
2712 | if (ext4_has_inline_data(inode)) | |
2713 | return 0; | |
2714 | ||
64769240 AT |
2715 | if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY) && |
2716 | test_opt(inode->i_sb, DELALLOC)) { | |
2717 | /* | |
2718 | * With delalloc we want to sync the file | |
2719 | * so that we can make sure we allocate | |
2720 | * blocks for file | |
2721 | */ | |
2722 | filemap_write_and_wait(mapping); | |
2723 | } | |
2724 | ||
19f5fb7a TT |
2725 | if (EXT4_JOURNAL(inode) && |
2726 | ext4_test_inode_state(inode, EXT4_STATE_JDATA)) { | |
ac27a0ec DK |
2727 | /* |
2728 | * This is a REALLY heavyweight approach, but the use of | |
2729 | * bmap on dirty files is expected to be extremely rare: | |
2730 | * only if we run lilo or swapon on a freshly made file | |
2731 | * do we expect this to happen. | |
2732 | * | |
2733 | * (bmap requires CAP_SYS_RAWIO so this does not | |
2734 | * represent an unprivileged user DOS attack --- we'd be | |
2735 | * in trouble if mortal users could trigger this path at | |
2736 | * will.) | |
2737 | * | |
617ba13b | 2738 | * NB. EXT4_STATE_JDATA is not set on files other than |
ac27a0ec DK |
2739 | * regular files. If somebody wants to bmap a directory |
2740 | * or symlink and gets confused because the buffer | |
2741 | * hasn't yet been flushed to disk, they deserve | |
2742 | * everything they get. | |
2743 | */ | |
2744 | ||
19f5fb7a | 2745 | ext4_clear_inode_state(inode, EXT4_STATE_JDATA); |
617ba13b | 2746 | journal = EXT4_JOURNAL(inode); |
dab291af MC |
2747 | jbd2_journal_lock_updates(journal); |
2748 | err = jbd2_journal_flush(journal); | |
2749 | jbd2_journal_unlock_updates(journal); | |
ac27a0ec DK |
2750 | |
2751 | if (err) | |
2752 | return 0; | |
2753 | } | |
2754 | ||
af5bc92d | 2755 | return generic_block_bmap(mapping, block, ext4_get_block); |
ac27a0ec DK |
2756 | } |
2757 | ||
617ba13b | 2758 | static int ext4_readpage(struct file *file, struct page *page) |
ac27a0ec | 2759 | { |
46c7f254 TM |
2760 | int ret = -EAGAIN; |
2761 | struct inode *inode = page->mapping->host; | |
2762 | ||
0562e0ba | 2763 | trace_ext4_readpage(page); |
46c7f254 TM |
2764 | |
2765 | if (ext4_has_inline_data(inode)) | |
2766 | ret = ext4_readpage_inline(inode, page); | |
2767 | ||
2768 | if (ret == -EAGAIN) | |
2769 | return mpage_readpage(page, ext4_get_block); | |
2770 | ||
2771 | return ret; | |
ac27a0ec DK |
2772 | } |
2773 | ||
2774 | static int | |
617ba13b | 2775 | ext4_readpages(struct file *file, struct address_space *mapping, |
ac27a0ec DK |
2776 | struct list_head *pages, unsigned nr_pages) |
2777 | { | |
46c7f254 TM |
2778 | struct inode *inode = mapping->host; |
2779 | ||
2780 | /* If the file has inline data, no need to do readpages. */ | |
2781 | if (ext4_has_inline_data(inode)) | |
2782 | return 0; | |
2783 | ||
617ba13b | 2784 | return mpage_readpages(mapping, pages, nr_pages, ext4_get_block); |
ac27a0ec DK |
2785 | } |
2786 | ||
744692dc JZ |
2787 | static void ext4_invalidatepage_free_endio(struct page *page, unsigned long offset) |
2788 | { | |
2789 | struct buffer_head *head, *bh; | |
2790 | unsigned int curr_off = 0; | |
2791 | ||
2792 | if (!page_has_buffers(page)) | |
2793 | return; | |
2794 | head = bh = page_buffers(page); | |
2795 | do { | |
2796 | if (offset <= curr_off && test_clear_buffer_uninit(bh) | |
2797 | && bh->b_private) { | |
2798 | ext4_free_io_end(bh->b_private); | |
2799 | bh->b_private = NULL; | |
2800 | bh->b_end_io = NULL; | |
2801 | } | |
2802 | curr_off = curr_off + bh->b_size; | |
2803 | bh = bh->b_this_page; | |
2804 | } while (bh != head); | |
2805 | } | |
2806 | ||
617ba13b | 2807 | static void ext4_invalidatepage(struct page *page, unsigned long offset) |
ac27a0ec | 2808 | { |
617ba13b | 2809 | journal_t *journal = EXT4_JOURNAL(page->mapping->host); |
ac27a0ec | 2810 | |
0562e0ba JZ |
2811 | trace_ext4_invalidatepage(page, offset); |
2812 | ||
744692dc JZ |
2813 | /* |
2814 | * free any io_end structure allocated for buffers to be discarded | |
2815 | */ | |
2816 | if (ext4_should_dioread_nolock(page->mapping->host)) | |
2817 | ext4_invalidatepage_free_endio(page, offset); | |
ac27a0ec DK |
2818 | /* |
2819 | * If it's a full truncate we just forget about the pending dirtying | |
2820 | */ | |
2821 | if (offset == 0) | |
2822 | ClearPageChecked(page); | |
2823 | ||
0390131b FM |
2824 | if (journal) |
2825 | jbd2_journal_invalidatepage(journal, page, offset); | |
2826 | else | |
2827 | block_invalidatepage(page, offset); | |
ac27a0ec DK |
2828 | } |
2829 | ||
617ba13b | 2830 | static int ext4_releasepage(struct page *page, gfp_t wait) |
ac27a0ec | 2831 | { |
617ba13b | 2832 | journal_t *journal = EXT4_JOURNAL(page->mapping->host); |
ac27a0ec | 2833 | |
0562e0ba JZ |
2834 | trace_ext4_releasepage(page); |
2835 | ||
ac27a0ec DK |
2836 | WARN_ON(PageChecked(page)); |
2837 | if (!page_has_buffers(page)) | |
2838 | return 0; | |
0390131b FM |
2839 | if (journal) |
2840 | return jbd2_journal_try_to_free_buffers(journal, page, wait); | |
2841 | else | |
2842 | return try_to_free_buffers(page); | |
ac27a0ec DK |
2843 | } |
2844 | ||
2ed88685 TT |
2845 | /* |
2846 | * ext4_get_block used when preparing for a DIO write or buffer write. | |
2847 | * We allocate an uinitialized extent if blocks haven't been allocated. | |
2848 | * The extent will be converted to initialized after the IO is complete. | |
2849 | */ | |
f19d5870 | 2850 | int ext4_get_block_write(struct inode *inode, sector_t iblock, |
4c0425ff MC |
2851 | struct buffer_head *bh_result, int create) |
2852 | { | |
c7064ef1 | 2853 | ext4_debug("ext4_get_block_write: inode %lu, create flag %d\n", |
8d5d02e6 | 2854 | inode->i_ino, create); |
2ed88685 TT |
2855 | return _ext4_get_block(inode, iblock, bh_result, |
2856 | EXT4_GET_BLOCKS_IO_CREATE_EXT); | |
4c0425ff MC |
2857 | } |
2858 | ||
729f52c6 | 2859 | static int ext4_get_block_write_nolock(struct inode *inode, sector_t iblock, |
8b0f165f | 2860 | struct buffer_head *bh_result, int create) |
729f52c6 | 2861 | { |
8b0f165f AP |
2862 | ext4_debug("ext4_get_block_write_nolock: inode %lu, create flag %d\n", |
2863 | inode->i_ino, create); | |
2864 | return _ext4_get_block(inode, iblock, bh_result, | |
2865 | EXT4_GET_BLOCKS_NO_LOCK); | |
729f52c6 ZL |
2866 | } |
2867 | ||
4c0425ff | 2868 | static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset, |
552ef802 CH |
2869 | ssize_t size, void *private, int ret, |
2870 | bool is_async) | |
4c0425ff | 2871 | { |
72c5052d | 2872 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
4c0425ff | 2873 | ext4_io_end_t *io_end = iocb->private; |
4c0425ff | 2874 | |
4b70df18 M |
2875 | /* if not async direct IO or dio with 0 bytes write, just return */ |
2876 | if (!io_end || !size) | |
552ef802 | 2877 | goto out; |
4b70df18 | 2878 | |
88635ca2 | 2879 | ext_debug("ext4_end_io_dio(): io_end 0x%p " |
ace36ad4 | 2880 | "for inode %lu, iocb 0x%p, offset %llu, size %zd\n", |
8d5d02e6 MC |
2881 | iocb->private, io_end->inode->i_ino, iocb, offset, |
2882 | size); | |
8d5d02e6 | 2883 | |
b5a7e970 TT |
2884 | iocb->private = NULL; |
2885 | ||
8d5d02e6 | 2886 | /* if not aio dio with unwritten extents, just free io and return */ |
bd2d0210 | 2887 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { |
8d5d02e6 | 2888 | ext4_free_io_end(io_end); |
5b3ff237 JZ |
2889 | out: |
2890 | if (is_async) | |
2891 | aio_complete(iocb, ret, 0); | |
72c5052d | 2892 | inode_dio_done(inode); |
5b3ff237 | 2893 | return; |
8d5d02e6 MC |
2894 | } |
2895 | ||
4c0425ff MC |
2896 | io_end->offset = offset; |
2897 | io_end->size = size; | |
5b3ff237 JZ |
2898 | if (is_async) { |
2899 | io_end->iocb = iocb; | |
2900 | io_end->result = ret; | |
2901 | } | |
4c0425ff | 2902 | |
28a535f9 | 2903 | ext4_add_complete_io(io_end); |
4c0425ff | 2904 | } |
c7064ef1 | 2905 | |
744692dc JZ |
2906 | static void ext4_end_io_buffer_write(struct buffer_head *bh, int uptodate) |
2907 | { | |
2908 | ext4_io_end_t *io_end = bh->b_private; | |
744692dc | 2909 | struct inode *inode; |
744692dc JZ |
2910 | |
2911 | if (!test_clear_buffer_uninit(bh) || !io_end) | |
2912 | goto out; | |
2913 | ||
2914 | if (!(io_end->inode->i_sb->s_flags & MS_ACTIVE)) { | |
92b97816 TT |
2915 | ext4_msg(io_end->inode->i_sb, KERN_INFO, |
2916 | "sb umounted, discard end_io request for inode %lu", | |
2917 | io_end->inode->i_ino); | |
744692dc JZ |
2918 | ext4_free_io_end(io_end); |
2919 | goto out; | |
2920 | } | |
2921 | ||
32c80b32 TM |
2922 | /* |
2923 | * It may be over-defensive here to check EXT4_IO_END_UNWRITTEN now, | |
2924 | * but being more careful is always safe for the future change. | |
2925 | */ | |
744692dc | 2926 | inode = io_end->inode; |
0edeb71d | 2927 | ext4_set_io_unwritten_flag(inode, io_end); |
28a535f9 | 2928 | ext4_add_complete_io(io_end); |
744692dc JZ |
2929 | out: |
2930 | bh->b_private = NULL; | |
2931 | bh->b_end_io = NULL; | |
2932 | clear_buffer_uninit(bh); | |
2933 | end_buffer_async_write(bh, uptodate); | |
2934 | } | |
2935 | ||
2936 | static int ext4_set_bh_endio(struct buffer_head *bh, struct inode *inode) | |
2937 | { | |
2938 | ext4_io_end_t *io_end; | |
2939 | struct page *page = bh->b_page; | |
2940 | loff_t offset = (sector_t)page->index << PAGE_CACHE_SHIFT; | |
2941 | size_t size = bh->b_size; | |
2942 | ||
2943 | retry: | |
2944 | io_end = ext4_init_io_end(inode, GFP_ATOMIC); | |
2945 | if (!io_end) { | |
6db26ffc | 2946 | pr_warn_ratelimited("%s: allocation fail\n", __func__); |
744692dc JZ |
2947 | schedule(); |
2948 | goto retry; | |
2949 | } | |
2950 | io_end->offset = offset; | |
2951 | io_end->size = size; | |
2952 | /* | |
2953 | * We need to hold a reference to the page to make sure it | |
2954 | * doesn't get evicted before ext4_end_io_work() has a chance | |
2955 | * to convert the extent from written to unwritten. | |
2956 | */ | |
2957 | io_end->page = page; | |
2958 | get_page(io_end->page); | |
2959 | ||
2960 | bh->b_private = io_end; | |
2961 | bh->b_end_io = ext4_end_io_buffer_write; | |
2962 | return 0; | |
2963 | } | |
2964 | ||
4c0425ff MC |
2965 | /* |
2966 | * For ext4 extent files, ext4 will do direct-io write to holes, | |
2967 | * preallocated extents, and those write extend the file, no need to | |
2968 | * fall back to buffered IO. | |
2969 | * | |
b595076a | 2970 | * For holes, we fallocate those blocks, mark them as uninitialized |
69c499d1 | 2971 | * If those blocks were preallocated, we mark sure they are split, but |
b595076a | 2972 | * still keep the range to write as uninitialized. |
4c0425ff | 2973 | * |
69c499d1 | 2974 | * The unwritten extents will be converted to written when DIO is completed. |
8d5d02e6 | 2975 | * For async direct IO, since the IO may still pending when return, we |
25985edc | 2976 | * set up an end_io call back function, which will do the conversion |
8d5d02e6 | 2977 | * when async direct IO completed. |
4c0425ff MC |
2978 | * |
2979 | * If the O_DIRECT write will extend the file then add this inode to the | |
2980 | * orphan list. So recovery will truncate it back to the original size | |
2981 | * if the machine crashes during the write. | |
2982 | * | |
2983 | */ | |
2984 | static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb, | |
2985 | const struct iovec *iov, loff_t offset, | |
2986 | unsigned long nr_segs) | |
2987 | { | |
2988 | struct file *file = iocb->ki_filp; | |
2989 | struct inode *inode = file->f_mapping->host; | |
2990 | ssize_t ret; | |
2991 | size_t count = iov_length(iov, nr_segs); | |
69c499d1 TT |
2992 | int overwrite = 0; |
2993 | get_block_t *get_block_func = NULL; | |
2994 | int dio_flags = 0; | |
4c0425ff | 2995 | loff_t final_size = offset + count; |
729f52c6 | 2996 | |
69c499d1 TT |
2997 | /* Use the old path for reads and writes beyond i_size. */ |
2998 | if (rw != WRITE || final_size > inode->i_size) | |
2999 | return ext4_ind_direct_IO(rw, iocb, iov, offset, nr_segs); | |
4bd809db | 3000 | |
69c499d1 | 3001 | BUG_ON(iocb->private == NULL); |
4bd809db | 3002 | |
69c499d1 TT |
3003 | /* If we do a overwrite dio, i_mutex locking can be released */ |
3004 | overwrite = *((int *)iocb->private); | |
4bd809db | 3005 | |
69c499d1 TT |
3006 | if (overwrite) { |
3007 | atomic_inc(&inode->i_dio_count); | |
3008 | down_read(&EXT4_I(inode)->i_data_sem); | |
3009 | mutex_unlock(&inode->i_mutex); | |
3010 | } | |
8d5d02e6 | 3011 | |
69c499d1 TT |
3012 | /* |
3013 | * We could direct write to holes and fallocate. | |
3014 | * | |
3015 | * Allocated blocks to fill the hole are marked as | |
3016 | * uninitialized to prevent parallel buffered read to expose | |
3017 | * the stale data before DIO complete the data IO. | |
3018 | * | |
3019 | * As to previously fallocated extents, ext4 get_block will | |
3020 | * just simply mark the buffer mapped but still keep the | |
3021 | * extents uninitialized. | |
3022 | * | |
3023 | * For non AIO case, we will convert those unwritten extents | |
3024 | * to written after return back from blockdev_direct_IO. | |
3025 | * | |
3026 | * For async DIO, the conversion needs to be deferred when the | |
3027 | * IO is completed. The ext4 end_io callback function will be | |
3028 | * called to take care of the conversion work. Here for async | |
3029 | * case, we allocate an io_end structure to hook to the iocb. | |
3030 | */ | |
3031 | iocb->private = NULL; | |
3032 | ext4_inode_aio_set(inode, NULL); | |
3033 | if (!is_sync_kiocb(iocb)) { | |
3034 | ext4_io_end_t *io_end = ext4_init_io_end(inode, GFP_NOFS); | |
3035 | if (!io_end) { | |
3036 | ret = -ENOMEM; | |
3037 | goto retake_lock; | |
8b0f165f | 3038 | } |
69c499d1 TT |
3039 | io_end->flag |= EXT4_IO_END_DIRECT; |
3040 | iocb->private = io_end; | |
8d5d02e6 | 3041 | /* |
69c499d1 TT |
3042 | * we save the io structure for current async direct |
3043 | * IO, so that later ext4_map_blocks() could flag the | |
3044 | * io structure whether there is a unwritten extents | |
3045 | * needs to be converted when IO is completed. | |
8d5d02e6 | 3046 | */ |
69c499d1 TT |
3047 | ext4_inode_aio_set(inode, io_end); |
3048 | } | |
4bd809db | 3049 | |
69c499d1 TT |
3050 | if (overwrite) { |
3051 | get_block_func = ext4_get_block_write_nolock; | |
3052 | } else { | |
3053 | get_block_func = ext4_get_block_write; | |
3054 | dio_flags = DIO_LOCKING; | |
3055 | } | |
3056 | ret = __blockdev_direct_IO(rw, iocb, inode, | |
3057 | inode->i_sb->s_bdev, iov, | |
3058 | offset, nr_segs, | |
3059 | get_block_func, | |
3060 | ext4_end_io_dio, | |
3061 | NULL, | |
3062 | dio_flags); | |
3063 | ||
3064 | if (iocb->private) | |
3065 | ext4_inode_aio_set(inode, NULL); | |
3066 | /* | |
3067 | * The io_end structure takes a reference to the inode, that | |
3068 | * structure needs to be destroyed and the reference to the | |
3069 | * inode need to be dropped, when IO is complete, even with 0 | |
3070 | * byte write, or failed. | |
3071 | * | |
3072 | * In the successful AIO DIO case, the io_end structure will | |
3073 | * be destroyed and the reference to the inode will be dropped | |
3074 | * after the end_io call back function is called. | |
3075 | * | |
3076 | * In the case there is 0 byte write, or error case, since VFS | |
3077 | * direct IO won't invoke the end_io call back function, we | |
3078 | * need to free the end_io structure here. | |
3079 | */ | |
3080 | if (ret != -EIOCBQUEUED && ret <= 0 && iocb->private) { | |
3081 | ext4_free_io_end(iocb->private); | |
3082 | iocb->private = NULL; | |
3083 | } else if (ret > 0 && !overwrite && ext4_test_inode_state(inode, | |
3084 | EXT4_STATE_DIO_UNWRITTEN)) { | |
3085 | int err; | |
3086 | /* | |
3087 | * for non AIO case, since the IO is already | |
3088 | * completed, we could do the conversion right here | |
3089 | */ | |
3090 | err = ext4_convert_unwritten_extents(inode, | |
3091 | offset, ret); | |
3092 | if (err < 0) | |
3093 | ret = err; | |
3094 | ext4_clear_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN); | |
3095 | } | |
4bd809db | 3096 | |
69c499d1 TT |
3097 | retake_lock: |
3098 | /* take i_mutex locking again if we do a ovewrite dio */ | |
3099 | if (overwrite) { | |
3100 | inode_dio_done(inode); | |
3101 | up_read(&EXT4_I(inode)->i_data_sem); | |
3102 | mutex_lock(&inode->i_mutex); | |
4c0425ff | 3103 | } |
8d5d02e6 | 3104 | |
69c499d1 | 3105 | return ret; |
4c0425ff MC |
3106 | } |
3107 | ||
3108 | static ssize_t ext4_direct_IO(int rw, struct kiocb *iocb, | |
3109 | const struct iovec *iov, loff_t offset, | |
3110 | unsigned long nr_segs) | |
3111 | { | |
3112 | struct file *file = iocb->ki_filp; | |
3113 | struct inode *inode = file->f_mapping->host; | |
0562e0ba | 3114 | ssize_t ret; |
4c0425ff | 3115 | |
84ebd795 TT |
3116 | /* |
3117 | * If we are doing data journalling we don't support O_DIRECT | |
3118 | */ | |
3119 | if (ext4_should_journal_data(inode)) | |
3120 | return 0; | |
3121 | ||
46c7f254 TM |
3122 | /* Let buffer I/O handle the inline data case. */ |
3123 | if (ext4_has_inline_data(inode)) | |
3124 | return 0; | |
3125 | ||
0562e0ba | 3126 | trace_ext4_direct_IO_enter(inode, offset, iov_length(iov, nr_segs), rw); |
12e9b892 | 3127 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
0562e0ba JZ |
3128 | ret = ext4_ext_direct_IO(rw, iocb, iov, offset, nr_segs); |
3129 | else | |
3130 | ret = ext4_ind_direct_IO(rw, iocb, iov, offset, nr_segs); | |
3131 | trace_ext4_direct_IO_exit(inode, offset, | |
3132 | iov_length(iov, nr_segs), rw, ret); | |
3133 | return ret; | |
4c0425ff MC |
3134 | } |
3135 | ||
ac27a0ec | 3136 | /* |
617ba13b | 3137 | * Pages can be marked dirty completely asynchronously from ext4's journalling |
ac27a0ec DK |
3138 | * activity. By filemap_sync_pte(), try_to_unmap_one(), etc. We cannot do |
3139 | * much here because ->set_page_dirty is called under VFS locks. The page is | |
3140 | * not necessarily locked. | |
3141 | * | |
3142 | * We cannot just dirty the page and leave attached buffers clean, because the | |
3143 | * buffers' dirty state is "definitive". We cannot just set the buffers dirty | |
3144 | * or jbddirty because all the journalling code will explode. | |
3145 | * | |
3146 | * So what we do is to mark the page "pending dirty" and next time writepage | |
3147 | * is called, propagate that into the buffers appropriately. | |
3148 | */ | |
617ba13b | 3149 | static int ext4_journalled_set_page_dirty(struct page *page) |
ac27a0ec DK |
3150 | { |
3151 | SetPageChecked(page); | |
3152 | return __set_page_dirty_nobuffers(page); | |
3153 | } | |
3154 | ||
617ba13b | 3155 | static const struct address_space_operations ext4_ordered_aops = { |
8ab22b9a HH |
3156 | .readpage = ext4_readpage, |
3157 | .readpages = ext4_readpages, | |
43ce1d23 | 3158 | .writepage = ext4_writepage, |
8ab22b9a HH |
3159 | .write_begin = ext4_write_begin, |
3160 | .write_end = ext4_ordered_write_end, | |
3161 | .bmap = ext4_bmap, | |
3162 | .invalidatepage = ext4_invalidatepage, | |
3163 | .releasepage = ext4_releasepage, | |
3164 | .direct_IO = ext4_direct_IO, | |
3165 | .migratepage = buffer_migrate_page, | |
3166 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 3167 | .error_remove_page = generic_error_remove_page, |
ac27a0ec DK |
3168 | }; |
3169 | ||
617ba13b | 3170 | static const struct address_space_operations ext4_writeback_aops = { |
8ab22b9a HH |
3171 | .readpage = ext4_readpage, |
3172 | .readpages = ext4_readpages, | |
43ce1d23 | 3173 | .writepage = ext4_writepage, |
8ab22b9a HH |
3174 | .write_begin = ext4_write_begin, |
3175 | .write_end = ext4_writeback_write_end, | |
3176 | .bmap = ext4_bmap, | |
3177 | .invalidatepage = ext4_invalidatepage, | |
3178 | .releasepage = ext4_releasepage, | |
3179 | .direct_IO = ext4_direct_IO, | |
3180 | .migratepage = buffer_migrate_page, | |
3181 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 3182 | .error_remove_page = generic_error_remove_page, |
ac27a0ec DK |
3183 | }; |
3184 | ||
617ba13b | 3185 | static const struct address_space_operations ext4_journalled_aops = { |
8ab22b9a HH |
3186 | .readpage = ext4_readpage, |
3187 | .readpages = ext4_readpages, | |
43ce1d23 | 3188 | .writepage = ext4_writepage, |
8ab22b9a HH |
3189 | .write_begin = ext4_write_begin, |
3190 | .write_end = ext4_journalled_write_end, | |
3191 | .set_page_dirty = ext4_journalled_set_page_dirty, | |
3192 | .bmap = ext4_bmap, | |
3193 | .invalidatepage = ext4_invalidatepage, | |
3194 | .releasepage = ext4_releasepage, | |
84ebd795 | 3195 | .direct_IO = ext4_direct_IO, |
8ab22b9a | 3196 | .is_partially_uptodate = block_is_partially_uptodate, |
aa261f54 | 3197 | .error_remove_page = generic_error_remove_page, |
ac27a0ec DK |
3198 | }; |
3199 | ||
64769240 | 3200 | static const struct address_space_operations ext4_da_aops = { |
8ab22b9a HH |
3201 | .readpage = ext4_readpage, |
3202 | .readpages = ext4_readpages, | |
43ce1d23 | 3203 | .writepage = ext4_writepage, |
8ab22b9a | 3204 | .writepages = ext4_da_writepages, |
8ab22b9a HH |
3205 | .write_begin = ext4_da_write_begin, |
3206 | .write_end = ext4_da_write_end, | |
3207 | .bmap = ext4_bmap, | |
3208 | .invalidatepage = ext4_da_invalidatepage, | |
3209 | .releasepage = ext4_releasepage, | |
3210 | .direct_IO = ext4_direct_IO, | |
3211 | .migratepage = buffer_migrate_page, | |
3212 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 3213 | .error_remove_page = generic_error_remove_page, |
64769240 AT |
3214 | }; |
3215 | ||
617ba13b | 3216 | void ext4_set_aops(struct inode *inode) |
ac27a0ec | 3217 | { |
3d2b1582 LC |
3218 | switch (ext4_inode_journal_mode(inode)) { |
3219 | case EXT4_INODE_ORDERED_DATA_MODE: | |
3220 | if (test_opt(inode->i_sb, DELALLOC)) | |
3221 | inode->i_mapping->a_ops = &ext4_da_aops; | |
3222 | else | |
3223 | inode->i_mapping->a_ops = &ext4_ordered_aops; | |
3224 | break; | |
3225 | case EXT4_INODE_WRITEBACK_DATA_MODE: | |
3226 | if (test_opt(inode->i_sb, DELALLOC)) | |
3227 | inode->i_mapping->a_ops = &ext4_da_aops; | |
3228 | else | |
3229 | inode->i_mapping->a_ops = &ext4_writeback_aops; | |
3230 | break; | |
3231 | case EXT4_INODE_JOURNAL_DATA_MODE: | |
617ba13b | 3232 | inode->i_mapping->a_ops = &ext4_journalled_aops; |
3d2b1582 LC |
3233 | break; |
3234 | default: | |
3235 | BUG(); | |
3236 | } | |
ac27a0ec DK |
3237 | } |
3238 | ||
4e96b2db AH |
3239 | |
3240 | /* | |
3241 | * ext4_discard_partial_page_buffers() | |
3242 | * Wrapper function for ext4_discard_partial_page_buffers_no_lock. | |
3243 | * This function finds and locks the page containing the offset | |
3244 | * "from" and passes it to ext4_discard_partial_page_buffers_no_lock. | |
3245 | * Calling functions that already have the page locked should call | |
3246 | * ext4_discard_partial_page_buffers_no_lock directly. | |
3247 | */ | |
3248 | int ext4_discard_partial_page_buffers(handle_t *handle, | |
3249 | struct address_space *mapping, loff_t from, | |
3250 | loff_t length, int flags) | |
3251 | { | |
3252 | struct inode *inode = mapping->host; | |
3253 | struct page *page; | |
3254 | int err = 0; | |
3255 | ||
3256 | page = find_or_create_page(mapping, from >> PAGE_CACHE_SHIFT, | |
3257 | mapping_gfp_mask(mapping) & ~__GFP_FS); | |
3258 | if (!page) | |
5129d05f | 3259 | return -ENOMEM; |
4e96b2db AH |
3260 | |
3261 | err = ext4_discard_partial_page_buffers_no_lock(handle, inode, page, | |
3262 | from, length, flags); | |
3263 | ||
3264 | unlock_page(page); | |
3265 | page_cache_release(page); | |
3266 | return err; | |
3267 | } | |
3268 | ||
3269 | /* | |
3270 | * ext4_discard_partial_page_buffers_no_lock() | |
3271 | * Zeros a page range of length 'length' starting from offset 'from'. | |
3272 | * Buffer heads that correspond to the block aligned regions of the | |
3273 | * zeroed range will be unmapped. Unblock aligned regions | |
3274 | * will have the corresponding buffer head mapped if needed so that | |
3275 | * that region of the page can be updated with the partial zero out. | |
3276 | * | |
3277 | * This function assumes that the page has already been locked. The | |
3278 | * The range to be discarded must be contained with in the given page. | |
3279 | * If the specified range exceeds the end of the page it will be shortened | |
3280 | * to the end of the page that corresponds to 'from'. This function is | |
3281 | * appropriate for updating a page and it buffer heads to be unmapped and | |
3282 | * zeroed for blocks that have been either released, or are going to be | |
3283 | * released. | |
3284 | * | |
3285 | * handle: The journal handle | |
3286 | * inode: The files inode | |
3287 | * page: A locked page that contains the offset "from" | |
4907cb7b | 3288 | * from: The starting byte offset (from the beginning of the file) |
4e96b2db AH |
3289 | * to begin discarding |
3290 | * len: The length of bytes to discard | |
3291 | * flags: Optional flags that may be used: | |
3292 | * | |
3293 | * EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED | |
3294 | * Only zero the regions of the page whose buffer heads | |
3295 | * have already been unmapped. This flag is appropriate | |
4907cb7b | 3296 | * for updating the contents of a page whose blocks may |
4e96b2db AH |
3297 | * have already been released, and we only want to zero |
3298 | * out the regions that correspond to those released blocks. | |
3299 | * | |
4907cb7b | 3300 | * Returns zero on success or negative on failure. |
4e96b2db | 3301 | */ |
5f163cc7 | 3302 | static int ext4_discard_partial_page_buffers_no_lock(handle_t *handle, |
4e96b2db AH |
3303 | struct inode *inode, struct page *page, loff_t from, |
3304 | loff_t length, int flags) | |
3305 | { | |
3306 | ext4_fsblk_t index = from >> PAGE_CACHE_SHIFT; | |
3307 | unsigned int offset = from & (PAGE_CACHE_SIZE-1); | |
3308 | unsigned int blocksize, max, pos; | |
4e96b2db AH |
3309 | ext4_lblk_t iblock; |
3310 | struct buffer_head *bh; | |
3311 | int err = 0; | |
3312 | ||
3313 | blocksize = inode->i_sb->s_blocksize; | |
3314 | max = PAGE_CACHE_SIZE - offset; | |
3315 | ||
3316 | if (index != page->index) | |
3317 | return -EINVAL; | |
3318 | ||
3319 | /* | |
3320 | * correct length if it does not fall between | |
3321 | * 'from' and the end of the page | |
3322 | */ | |
3323 | if (length > max || length < 0) | |
3324 | length = max; | |
3325 | ||
3326 | iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); | |
3327 | ||
093e6e36 YY |
3328 | if (!page_has_buffers(page)) |
3329 | create_empty_buffers(page, blocksize, 0); | |
4e96b2db AH |
3330 | |
3331 | /* Find the buffer that contains "offset" */ | |
3332 | bh = page_buffers(page); | |
3333 | pos = blocksize; | |
3334 | while (offset >= pos) { | |
3335 | bh = bh->b_this_page; | |
3336 | iblock++; | |
3337 | pos += blocksize; | |
3338 | } | |
3339 | ||
3340 | pos = offset; | |
3341 | while (pos < offset + length) { | |
e260daf2 YY |
3342 | unsigned int end_of_block, range_to_discard; |
3343 | ||
4e96b2db AH |
3344 | err = 0; |
3345 | ||
3346 | /* The length of space left to zero and unmap */ | |
3347 | range_to_discard = offset + length - pos; | |
3348 | ||
3349 | /* The length of space until the end of the block */ | |
3350 | end_of_block = blocksize - (pos & (blocksize-1)); | |
3351 | ||
3352 | /* | |
3353 | * Do not unmap or zero past end of block | |
3354 | * for this buffer head | |
3355 | */ | |
3356 | if (range_to_discard > end_of_block) | |
3357 | range_to_discard = end_of_block; | |
3358 | ||
3359 | ||
3360 | /* | |
3361 | * Skip this buffer head if we are only zeroing unampped | |
3362 | * regions of the page | |
3363 | */ | |
3364 | if (flags & EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED && | |
3365 | buffer_mapped(bh)) | |
3366 | goto next; | |
3367 | ||
3368 | /* If the range is block aligned, unmap */ | |
3369 | if (range_to_discard == blocksize) { | |
3370 | clear_buffer_dirty(bh); | |
3371 | bh->b_bdev = NULL; | |
3372 | clear_buffer_mapped(bh); | |
3373 | clear_buffer_req(bh); | |
3374 | clear_buffer_new(bh); | |
3375 | clear_buffer_delay(bh); | |
3376 | clear_buffer_unwritten(bh); | |
3377 | clear_buffer_uptodate(bh); | |
3378 | zero_user(page, pos, range_to_discard); | |
3379 | BUFFER_TRACE(bh, "Buffer discarded"); | |
3380 | goto next; | |
3381 | } | |
3382 | ||
3383 | /* | |
3384 | * If this block is not completely contained in the range | |
3385 | * to be discarded, then it is not going to be released. Because | |
3386 | * we need to keep this block, we need to make sure this part | |
3387 | * of the page is uptodate before we modify it by writeing | |
3388 | * partial zeros on it. | |
3389 | */ | |
3390 | if (!buffer_mapped(bh)) { | |
3391 | /* | |
3392 | * Buffer head must be mapped before we can read | |
3393 | * from the block | |
3394 | */ | |
3395 | BUFFER_TRACE(bh, "unmapped"); | |
3396 | ext4_get_block(inode, iblock, bh, 0); | |
3397 | /* unmapped? It's a hole - nothing to do */ | |
3398 | if (!buffer_mapped(bh)) { | |
3399 | BUFFER_TRACE(bh, "still unmapped"); | |
3400 | goto next; | |
3401 | } | |
3402 | } | |
3403 | ||
3404 | /* Ok, it's mapped. Make sure it's up-to-date */ | |
3405 | if (PageUptodate(page)) | |
3406 | set_buffer_uptodate(bh); | |
3407 | ||
3408 | if (!buffer_uptodate(bh)) { | |
3409 | err = -EIO; | |
3410 | ll_rw_block(READ, 1, &bh); | |
3411 | wait_on_buffer(bh); | |
3412 | /* Uhhuh. Read error. Complain and punt.*/ | |
3413 | if (!buffer_uptodate(bh)) | |
3414 | goto next; | |
3415 | } | |
3416 | ||
3417 | if (ext4_should_journal_data(inode)) { | |
3418 | BUFFER_TRACE(bh, "get write access"); | |
3419 | err = ext4_journal_get_write_access(handle, bh); | |
3420 | if (err) | |
3421 | goto next; | |
3422 | } | |
3423 | ||
3424 | zero_user(page, pos, range_to_discard); | |
3425 | ||
3426 | err = 0; | |
3427 | if (ext4_should_journal_data(inode)) { | |
3428 | err = ext4_handle_dirty_metadata(handle, inode, bh); | |
decbd919 | 3429 | } else |
4e96b2db | 3430 | mark_buffer_dirty(bh); |
4e96b2db AH |
3431 | |
3432 | BUFFER_TRACE(bh, "Partial buffer zeroed"); | |
3433 | next: | |
3434 | bh = bh->b_this_page; | |
3435 | iblock++; | |
3436 | pos += range_to_discard; | |
3437 | } | |
3438 | ||
3439 | return err; | |
3440 | } | |
3441 | ||
91ef4caf DG |
3442 | int ext4_can_truncate(struct inode *inode) |
3443 | { | |
91ef4caf DG |
3444 | if (S_ISREG(inode->i_mode)) |
3445 | return 1; | |
3446 | if (S_ISDIR(inode->i_mode)) | |
3447 | return 1; | |
3448 | if (S_ISLNK(inode->i_mode)) | |
3449 | return !ext4_inode_is_fast_symlink(inode); | |
3450 | return 0; | |
3451 | } | |
3452 | ||
a4bb6b64 AH |
3453 | /* |
3454 | * ext4_punch_hole: punches a hole in a file by releaseing the blocks | |
3455 | * associated with the given offset and length | |
3456 | * | |
3457 | * @inode: File inode | |
3458 | * @offset: The offset where the hole will begin | |
3459 | * @len: The length of the hole | |
3460 | * | |
4907cb7b | 3461 | * Returns: 0 on success or negative on failure |
a4bb6b64 AH |
3462 | */ |
3463 | ||
3464 | int ext4_punch_hole(struct file *file, loff_t offset, loff_t length) | |
3465 | { | |
3466 | struct inode *inode = file->f_path.dentry->d_inode; | |
3467 | if (!S_ISREG(inode->i_mode)) | |
73355192 | 3468 | return -EOPNOTSUPP; |
a4bb6b64 AH |
3469 | |
3470 | if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { | |
3471 | /* TODO: Add support for non extent hole punching */ | |
73355192 | 3472 | return -EOPNOTSUPP; |
a4bb6b64 AH |
3473 | } |
3474 | ||
bab08ab9 TT |
3475 | if (EXT4_SB(inode->i_sb)->s_cluster_ratio > 1) { |
3476 | /* TODO: Add support for bigalloc file systems */ | |
73355192 | 3477 | return -EOPNOTSUPP; |
bab08ab9 TT |
3478 | } |
3479 | ||
a4bb6b64 AH |
3480 | return ext4_ext_punch_hole(file, offset, length); |
3481 | } | |
3482 | ||
ac27a0ec | 3483 | /* |
617ba13b | 3484 | * ext4_truncate() |
ac27a0ec | 3485 | * |
617ba13b MC |
3486 | * We block out ext4_get_block() block instantiations across the entire |
3487 | * transaction, and VFS/VM ensures that ext4_truncate() cannot run | |
ac27a0ec DK |
3488 | * simultaneously on behalf of the same inode. |
3489 | * | |
42b2aa86 | 3490 | * As we work through the truncate and commit bits of it to the journal there |
ac27a0ec DK |
3491 | * is one core, guiding principle: the file's tree must always be consistent on |
3492 | * disk. We must be able to restart the truncate after a crash. | |
3493 | * | |
3494 | * The file's tree may be transiently inconsistent in memory (although it | |
3495 | * probably isn't), but whenever we close off and commit a journal transaction, | |
3496 | * the contents of (the filesystem + the journal) must be consistent and | |
3497 | * restartable. It's pretty simple, really: bottom up, right to left (although | |
3498 | * left-to-right works OK too). | |
3499 | * | |
3500 | * Note that at recovery time, journal replay occurs *before* the restart of | |
3501 | * truncate against the orphan inode list. | |
3502 | * | |
3503 | * The committed inode has the new, desired i_size (which is the same as | |
617ba13b | 3504 | * i_disksize in this case). After a crash, ext4_orphan_cleanup() will see |
ac27a0ec | 3505 | * that this inode's truncate did not complete and it will again call |
617ba13b MC |
3506 | * ext4_truncate() to have another go. So there will be instantiated blocks |
3507 | * to the right of the truncation point in a crashed ext4 filesystem. But | |
ac27a0ec | 3508 | * that's fine - as long as they are linked from the inode, the post-crash |
617ba13b | 3509 | * ext4_truncate() run will find them and release them. |
ac27a0ec | 3510 | */ |
617ba13b | 3511 | void ext4_truncate(struct inode *inode) |
ac27a0ec | 3512 | { |
0562e0ba JZ |
3513 | trace_ext4_truncate_enter(inode); |
3514 | ||
91ef4caf | 3515 | if (!ext4_can_truncate(inode)) |
ac27a0ec DK |
3516 | return; |
3517 | ||
12e9b892 | 3518 | ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS); |
c8d46e41 | 3519 | |
5534fb5b | 3520 | if (inode->i_size == 0 && !test_opt(inode->i_sb, NO_AUTO_DA_ALLOC)) |
19f5fb7a | 3521 | ext4_set_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE); |
7d8f9f7d | 3522 | |
ff9893dc | 3523 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
cf108bca | 3524 | ext4_ext_truncate(inode); |
ff9893dc AG |
3525 | else |
3526 | ext4_ind_truncate(inode); | |
ac27a0ec | 3527 | |
0562e0ba | 3528 | trace_ext4_truncate_exit(inode); |
ac27a0ec DK |
3529 | } |
3530 | ||
ac27a0ec | 3531 | /* |
617ba13b | 3532 | * ext4_get_inode_loc returns with an extra refcount against the inode's |
ac27a0ec DK |
3533 | * underlying buffer_head on success. If 'in_mem' is true, we have all |
3534 | * data in memory that is needed to recreate the on-disk version of this | |
3535 | * inode. | |
3536 | */ | |
617ba13b MC |
3537 | static int __ext4_get_inode_loc(struct inode *inode, |
3538 | struct ext4_iloc *iloc, int in_mem) | |
ac27a0ec | 3539 | { |
240799cd TT |
3540 | struct ext4_group_desc *gdp; |
3541 | struct buffer_head *bh; | |
3542 | struct super_block *sb = inode->i_sb; | |
3543 | ext4_fsblk_t block; | |
3544 | int inodes_per_block, inode_offset; | |
3545 | ||
3a06d778 | 3546 | iloc->bh = NULL; |
240799cd TT |
3547 | if (!ext4_valid_inum(sb, inode->i_ino)) |
3548 | return -EIO; | |
ac27a0ec | 3549 | |
240799cd TT |
3550 | iloc->block_group = (inode->i_ino - 1) / EXT4_INODES_PER_GROUP(sb); |
3551 | gdp = ext4_get_group_desc(sb, iloc->block_group, NULL); | |
3552 | if (!gdp) | |
ac27a0ec DK |
3553 | return -EIO; |
3554 | ||
240799cd TT |
3555 | /* |
3556 | * Figure out the offset within the block group inode table | |
3557 | */ | |
00d09882 | 3558 | inodes_per_block = EXT4_SB(sb)->s_inodes_per_block; |
240799cd TT |
3559 | inode_offset = ((inode->i_ino - 1) % |
3560 | EXT4_INODES_PER_GROUP(sb)); | |
3561 | block = ext4_inode_table(sb, gdp) + (inode_offset / inodes_per_block); | |
3562 | iloc->offset = (inode_offset % inodes_per_block) * EXT4_INODE_SIZE(sb); | |
3563 | ||
3564 | bh = sb_getblk(sb, block); | |
ac27a0ec | 3565 | if (!bh) { |
c398eda0 TT |
3566 | EXT4_ERROR_INODE_BLOCK(inode, block, |
3567 | "unable to read itable block"); | |
ac27a0ec DK |
3568 | return -EIO; |
3569 | } | |
3570 | if (!buffer_uptodate(bh)) { | |
3571 | lock_buffer(bh); | |
9c83a923 HK |
3572 | |
3573 | /* | |
3574 | * If the buffer has the write error flag, we have failed | |
3575 | * to write out another inode in the same block. In this | |
3576 | * case, we don't have to read the block because we may | |
3577 | * read the old inode data successfully. | |
3578 | */ | |
3579 | if (buffer_write_io_error(bh) && !buffer_uptodate(bh)) | |
3580 | set_buffer_uptodate(bh); | |
3581 | ||
ac27a0ec DK |
3582 | if (buffer_uptodate(bh)) { |
3583 | /* someone brought it uptodate while we waited */ | |
3584 | unlock_buffer(bh); | |
3585 | goto has_buffer; | |
3586 | } | |
3587 | ||
3588 | /* | |
3589 | * If we have all information of the inode in memory and this | |
3590 | * is the only valid inode in the block, we need not read the | |
3591 | * block. | |
3592 | */ | |
3593 | if (in_mem) { | |
3594 | struct buffer_head *bitmap_bh; | |
240799cd | 3595 | int i, start; |
ac27a0ec | 3596 | |
240799cd | 3597 | start = inode_offset & ~(inodes_per_block - 1); |
ac27a0ec | 3598 | |
240799cd TT |
3599 | /* Is the inode bitmap in cache? */ |
3600 | bitmap_bh = sb_getblk(sb, ext4_inode_bitmap(sb, gdp)); | |
ac27a0ec DK |
3601 | if (!bitmap_bh) |
3602 | goto make_io; | |
3603 | ||
3604 | /* | |
3605 | * If the inode bitmap isn't in cache then the | |
3606 | * optimisation may end up performing two reads instead | |
3607 | * of one, so skip it. | |
3608 | */ | |
3609 | if (!buffer_uptodate(bitmap_bh)) { | |
3610 | brelse(bitmap_bh); | |
3611 | goto make_io; | |
3612 | } | |
240799cd | 3613 | for (i = start; i < start + inodes_per_block; i++) { |
ac27a0ec DK |
3614 | if (i == inode_offset) |
3615 | continue; | |
617ba13b | 3616 | if (ext4_test_bit(i, bitmap_bh->b_data)) |
ac27a0ec DK |
3617 | break; |
3618 | } | |
3619 | brelse(bitmap_bh); | |
240799cd | 3620 | if (i == start + inodes_per_block) { |
ac27a0ec DK |
3621 | /* all other inodes are free, so skip I/O */ |
3622 | memset(bh->b_data, 0, bh->b_size); | |
3623 | set_buffer_uptodate(bh); | |
3624 | unlock_buffer(bh); | |
3625 | goto has_buffer; | |
3626 | } | |
3627 | } | |
3628 | ||
3629 | make_io: | |
240799cd TT |
3630 | /* |
3631 | * If we need to do any I/O, try to pre-readahead extra | |
3632 | * blocks from the inode table. | |
3633 | */ | |
3634 | if (EXT4_SB(sb)->s_inode_readahead_blks) { | |
3635 | ext4_fsblk_t b, end, table; | |
3636 | unsigned num; | |
3637 | ||
3638 | table = ext4_inode_table(sb, gdp); | |
b713a5ec | 3639 | /* s_inode_readahead_blks is always a power of 2 */ |
240799cd TT |
3640 | b = block & ~(EXT4_SB(sb)->s_inode_readahead_blks-1); |
3641 | if (table > b) | |
3642 | b = table; | |
3643 | end = b + EXT4_SB(sb)->s_inode_readahead_blks; | |
3644 | num = EXT4_INODES_PER_GROUP(sb); | |
feb0ab32 | 3645 | if (ext4_has_group_desc_csum(sb)) |
560671a0 | 3646 | num -= ext4_itable_unused_count(sb, gdp); |
240799cd TT |
3647 | table += num / inodes_per_block; |
3648 | if (end > table) | |
3649 | end = table; | |
3650 | while (b <= end) | |
3651 | sb_breadahead(sb, b++); | |
3652 | } | |
3653 | ||
ac27a0ec DK |
3654 | /* |
3655 | * There are other valid inodes in the buffer, this inode | |
3656 | * has in-inode xattrs, or we don't have this inode in memory. | |
3657 | * Read the block from disk. | |
3658 | */ | |
0562e0ba | 3659 | trace_ext4_load_inode(inode); |
ac27a0ec DK |
3660 | get_bh(bh); |
3661 | bh->b_end_io = end_buffer_read_sync; | |
65299a3b | 3662 | submit_bh(READ | REQ_META | REQ_PRIO, bh); |
ac27a0ec DK |
3663 | wait_on_buffer(bh); |
3664 | if (!buffer_uptodate(bh)) { | |
c398eda0 TT |
3665 | EXT4_ERROR_INODE_BLOCK(inode, block, |
3666 | "unable to read itable block"); | |
ac27a0ec DK |
3667 | brelse(bh); |
3668 | return -EIO; | |
3669 | } | |
3670 | } | |
3671 | has_buffer: | |
3672 | iloc->bh = bh; | |
3673 | return 0; | |
3674 | } | |
3675 | ||
617ba13b | 3676 | int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc) |
ac27a0ec DK |
3677 | { |
3678 | /* We have all inode data except xattrs in memory here. */ | |
617ba13b | 3679 | return __ext4_get_inode_loc(inode, iloc, |
19f5fb7a | 3680 | !ext4_test_inode_state(inode, EXT4_STATE_XATTR)); |
ac27a0ec DK |
3681 | } |
3682 | ||
617ba13b | 3683 | void ext4_set_inode_flags(struct inode *inode) |
ac27a0ec | 3684 | { |
617ba13b | 3685 | unsigned int flags = EXT4_I(inode)->i_flags; |
ac27a0ec DK |
3686 | |
3687 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
617ba13b | 3688 | if (flags & EXT4_SYNC_FL) |
ac27a0ec | 3689 | inode->i_flags |= S_SYNC; |
617ba13b | 3690 | if (flags & EXT4_APPEND_FL) |
ac27a0ec | 3691 | inode->i_flags |= S_APPEND; |
617ba13b | 3692 | if (flags & EXT4_IMMUTABLE_FL) |
ac27a0ec | 3693 | inode->i_flags |= S_IMMUTABLE; |
617ba13b | 3694 | if (flags & EXT4_NOATIME_FL) |
ac27a0ec | 3695 | inode->i_flags |= S_NOATIME; |
617ba13b | 3696 | if (flags & EXT4_DIRSYNC_FL) |
ac27a0ec DK |
3697 | inode->i_flags |= S_DIRSYNC; |
3698 | } | |
3699 | ||
ff9ddf7e JK |
3700 | /* Propagate flags from i_flags to EXT4_I(inode)->i_flags */ |
3701 | void ext4_get_inode_flags(struct ext4_inode_info *ei) | |
3702 | { | |
84a8dce2 DM |
3703 | unsigned int vfs_fl; |
3704 | unsigned long old_fl, new_fl; | |
3705 | ||
3706 | do { | |
3707 | vfs_fl = ei->vfs_inode.i_flags; | |
3708 | old_fl = ei->i_flags; | |
3709 | new_fl = old_fl & ~(EXT4_SYNC_FL|EXT4_APPEND_FL| | |
3710 | EXT4_IMMUTABLE_FL|EXT4_NOATIME_FL| | |
3711 | EXT4_DIRSYNC_FL); | |
3712 | if (vfs_fl & S_SYNC) | |
3713 | new_fl |= EXT4_SYNC_FL; | |
3714 | if (vfs_fl & S_APPEND) | |
3715 | new_fl |= EXT4_APPEND_FL; | |
3716 | if (vfs_fl & S_IMMUTABLE) | |
3717 | new_fl |= EXT4_IMMUTABLE_FL; | |
3718 | if (vfs_fl & S_NOATIME) | |
3719 | new_fl |= EXT4_NOATIME_FL; | |
3720 | if (vfs_fl & S_DIRSYNC) | |
3721 | new_fl |= EXT4_DIRSYNC_FL; | |
3722 | } while (cmpxchg(&ei->i_flags, old_fl, new_fl) != old_fl); | |
ff9ddf7e | 3723 | } |
de9a55b8 | 3724 | |
0fc1b451 | 3725 | static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode, |
de9a55b8 | 3726 | struct ext4_inode_info *ei) |
0fc1b451 AK |
3727 | { |
3728 | blkcnt_t i_blocks ; | |
8180a562 AK |
3729 | struct inode *inode = &(ei->vfs_inode); |
3730 | struct super_block *sb = inode->i_sb; | |
0fc1b451 AK |
3731 | |
3732 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
3733 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { | |
3734 | /* we are using combined 48 bit field */ | |
3735 | i_blocks = ((u64)le16_to_cpu(raw_inode->i_blocks_high)) << 32 | | |
3736 | le32_to_cpu(raw_inode->i_blocks_lo); | |
07a03824 | 3737 | if (ext4_test_inode_flag(inode, EXT4_INODE_HUGE_FILE)) { |
8180a562 AK |
3738 | /* i_blocks represent file system block size */ |
3739 | return i_blocks << (inode->i_blkbits - 9); | |
3740 | } else { | |
3741 | return i_blocks; | |
3742 | } | |
0fc1b451 AK |
3743 | } else { |
3744 | return le32_to_cpu(raw_inode->i_blocks_lo); | |
3745 | } | |
3746 | } | |
ff9ddf7e | 3747 | |
152a7b0a TM |
3748 | static inline void ext4_iget_extra_inode(struct inode *inode, |
3749 | struct ext4_inode *raw_inode, | |
3750 | struct ext4_inode_info *ei) | |
3751 | { | |
3752 | __le32 *magic = (void *)raw_inode + | |
3753 | EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize; | |
67cf5b09 | 3754 | if (*magic == cpu_to_le32(EXT4_XATTR_MAGIC)) { |
152a7b0a | 3755 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
67cf5b09 | 3756 | ext4_find_inline_data_nolock(inode); |
f19d5870 TM |
3757 | } else |
3758 | EXT4_I(inode)->i_inline_off = 0; | |
152a7b0a TM |
3759 | } |
3760 | ||
1d1fe1ee | 3761 | struct inode *ext4_iget(struct super_block *sb, unsigned long ino) |
ac27a0ec | 3762 | { |
617ba13b MC |
3763 | struct ext4_iloc iloc; |
3764 | struct ext4_inode *raw_inode; | |
1d1fe1ee | 3765 | struct ext4_inode_info *ei; |
1d1fe1ee | 3766 | struct inode *inode; |
b436b9be | 3767 | journal_t *journal = EXT4_SB(sb)->s_journal; |
1d1fe1ee | 3768 | long ret; |
ac27a0ec | 3769 | int block; |
08cefc7a EB |
3770 | uid_t i_uid; |
3771 | gid_t i_gid; | |
ac27a0ec | 3772 | |
1d1fe1ee DH |
3773 | inode = iget_locked(sb, ino); |
3774 | if (!inode) | |
3775 | return ERR_PTR(-ENOMEM); | |
3776 | if (!(inode->i_state & I_NEW)) | |
3777 | return inode; | |
3778 | ||
3779 | ei = EXT4_I(inode); | |
7dc57615 | 3780 | iloc.bh = NULL; |
ac27a0ec | 3781 | |
1d1fe1ee DH |
3782 | ret = __ext4_get_inode_loc(inode, &iloc, 0); |
3783 | if (ret < 0) | |
ac27a0ec | 3784 | goto bad_inode; |
617ba13b | 3785 | raw_inode = ext4_raw_inode(&iloc); |
814525f4 DW |
3786 | |
3787 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) { | |
3788 | ei->i_extra_isize = le16_to_cpu(raw_inode->i_extra_isize); | |
3789 | if (EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize > | |
3790 | EXT4_INODE_SIZE(inode->i_sb)) { | |
3791 | EXT4_ERROR_INODE(inode, "bad extra_isize (%u != %u)", | |
3792 | EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize, | |
3793 | EXT4_INODE_SIZE(inode->i_sb)); | |
3794 | ret = -EIO; | |
3795 | goto bad_inode; | |
3796 | } | |
3797 | } else | |
3798 | ei->i_extra_isize = 0; | |
3799 | ||
3800 | /* Precompute checksum seed for inode metadata */ | |
3801 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
3802 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) { | |
3803 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
3804 | __u32 csum; | |
3805 | __le32 inum = cpu_to_le32(inode->i_ino); | |
3806 | __le32 gen = raw_inode->i_generation; | |
3807 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, | |
3808 | sizeof(inum)); | |
3809 | ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, | |
3810 | sizeof(gen)); | |
3811 | } | |
3812 | ||
3813 | if (!ext4_inode_csum_verify(inode, raw_inode, ei)) { | |
3814 | EXT4_ERROR_INODE(inode, "checksum invalid"); | |
3815 | ret = -EIO; | |
3816 | goto bad_inode; | |
3817 | } | |
3818 | ||
ac27a0ec | 3819 | inode->i_mode = le16_to_cpu(raw_inode->i_mode); |
08cefc7a EB |
3820 | i_uid = (uid_t)le16_to_cpu(raw_inode->i_uid_low); |
3821 | i_gid = (gid_t)le16_to_cpu(raw_inode->i_gid_low); | |
af5bc92d | 3822 | if (!(test_opt(inode->i_sb, NO_UID32))) { |
08cefc7a EB |
3823 | i_uid |= le16_to_cpu(raw_inode->i_uid_high) << 16; |
3824 | i_gid |= le16_to_cpu(raw_inode->i_gid_high) << 16; | |
ac27a0ec | 3825 | } |
08cefc7a EB |
3826 | i_uid_write(inode, i_uid); |
3827 | i_gid_write(inode, i_gid); | |
bfe86848 | 3828 | set_nlink(inode, le16_to_cpu(raw_inode->i_links_count)); |
ac27a0ec | 3829 | |
353eb83c | 3830 | ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */ |
67cf5b09 | 3831 | ei->i_inline_off = 0; |
ac27a0ec DK |
3832 | ei->i_dir_start_lookup = 0; |
3833 | ei->i_dtime = le32_to_cpu(raw_inode->i_dtime); | |
3834 | /* We now have enough fields to check if the inode was active or not. | |
3835 | * This is needed because nfsd might try to access dead inodes | |
3836 | * the test is that same one that e2fsck uses | |
3837 | * NeilBrown 1999oct15 | |
3838 | */ | |
3839 | if (inode->i_nlink == 0) { | |
3840 | if (inode->i_mode == 0 || | |
617ba13b | 3841 | !(EXT4_SB(inode->i_sb)->s_mount_state & EXT4_ORPHAN_FS)) { |
ac27a0ec | 3842 | /* this inode is deleted */ |
1d1fe1ee | 3843 | ret = -ESTALE; |
ac27a0ec DK |
3844 | goto bad_inode; |
3845 | } | |
3846 | /* The only unlinked inodes we let through here have | |
3847 | * valid i_mode and are being read by the orphan | |
3848 | * recovery code: that's fine, we're about to complete | |
3849 | * the process of deleting those. */ | |
3850 | } | |
ac27a0ec | 3851 | ei->i_flags = le32_to_cpu(raw_inode->i_flags); |
0fc1b451 | 3852 | inode->i_blocks = ext4_inode_blocks(raw_inode, ei); |
7973c0c1 | 3853 | ei->i_file_acl = le32_to_cpu(raw_inode->i_file_acl_lo); |
a9e81742 | 3854 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) |
a1ddeb7e BP |
3855 | ei->i_file_acl |= |
3856 | ((__u64)le16_to_cpu(raw_inode->i_file_acl_high)) << 32; | |
a48380f7 | 3857 | inode->i_size = ext4_isize(raw_inode); |
ac27a0ec | 3858 | ei->i_disksize = inode->i_size; |
a9e7f447 DM |
3859 | #ifdef CONFIG_QUOTA |
3860 | ei->i_reserved_quota = 0; | |
3861 | #endif | |
ac27a0ec DK |
3862 | inode->i_generation = le32_to_cpu(raw_inode->i_generation); |
3863 | ei->i_block_group = iloc.block_group; | |
a4912123 | 3864 | ei->i_last_alloc_group = ~0; |
ac27a0ec DK |
3865 | /* |
3866 | * NOTE! The in-memory inode i_data array is in little-endian order | |
3867 | * even on big-endian machines: we do NOT byteswap the block numbers! | |
3868 | */ | |
617ba13b | 3869 | for (block = 0; block < EXT4_N_BLOCKS; block++) |
ac27a0ec DK |
3870 | ei->i_data[block] = raw_inode->i_block[block]; |
3871 | INIT_LIST_HEAD(&ei->i_orphan); | |
3872 | ||
b436b9be JK |
3873 | /* |
3874 | * Set transaction id's of transactions that have to be committed | |
3875 | * to finish f[data]sync. We set them to currently running transaction | |
3876 | * as we cannot be sure that the inode or some of its metadata isn't | |
3877 | * part of the transaction - the inode could have been reclaimed and | |
3878 | * now it is reread from disk. | |
3879 | */ | |
3880 | if (journal) { | |
3881 | transaction_t *transaction; | |
3882 | tid_t tid; | |
3883 | ||
a931da6a | 3884 | read_lock(&journal->j_state_lock); |
b436b9be JK |
3885 | if (journal->j_running_transaction) |
3886 | transaction = journal->j_running_transaction; | |
3887 | else | |
3888 | transaction = journal->j_committing_transaction; | |
3889 | if (transaction) | |
3890 | tid = transaction->t_tid; | |
3891 | else | |
3892 | tid = journal->j_commit_sequence; | |
a931da6a | 3893 | read_unlock(&journal->j_state_lock); |
b436b9be JK |
3894 | ei->i_sync_tid = tid; |
3895 | ei->i_datasync_tid = tid; | |
3896 | } | |
3897 | ||
0040d987 | 3898 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) { |
ac27a0ec DK |
3899 | if (ei->i_extra_isize == 0) { |
3900 | /* The extra space is currently unused. Use it. */ | |
617ba13b MC |
3901 | ei->i_extra_isize = sizeof(struct ext4_inode) - |
3902 | EXT4_GOOD_OLD_INODE_SIZE; | |
ac27a0ec | 3903 | } else { |
152a7b0a | 3904 | ext4_iget_extra_inode(inode, raw_inode, ei); |
ac27a0ec | 3905 | } |
814525f4 | 3906 | } |
ac27a0ec | 3907 | |
ef7f3835 KS |
3908 | EXT4_INODE_GET_XTIME(i_ctime, inode, raw_inode); |
3909 | EXT4_INODE_GET_XTIME(i_mtime, inode, raw_inode); | |
3910 | EXT4_INODE_GET_XTIME(i_atime, inode, raw_inode); | |
3911 | EXT4_EINODE_GET_XTIME(i_crtime, ei, raw_inode); | |
3912 | ||
25ec56b5 JNC |
3913 | inode->i_version = le32_to_cpu(raw_inode->i_disk_version); |
3914 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) { | |
3915 | if (EXT4_FITS_IN_INODE(raw_inode, ei, i_version_hi)) | |
3916 | inode->i_version |= | |
3917 | (__u64)(le32_to_cpu(raw_inode->i_version_hi)) << 32; | |
3918 | } | |
3919 | ||
c4b5a614 | 3920 | ret = 0; |
485c26ec | 3921 | if (ei->i_file_acl && |
1032988c | 3922 | !ext4_data_block_valid(EXT4_SB(sb), ei->i_file_acl, 1)) { |
24676da4 TT |
3923 | EXT4_ERROR_INODE(inode, "bad extended attribute block %llu", |
3924 | ei->i_file_acl); | |
485c26ec TT |
3925 | ret = -EIO; |
3926 | goto bad_inode; | |
f19d5870 TM |
3927 | } else if (!ext4_has_inline_data(inode)) { |
3928 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { | |
3929 | if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
3930 | (S_ISLNK(inode->i_mode) && | |
3931 | !ext4_inode_is_fast_symlink(inode)))) | |
3932 | /* Validate extent which is part of inode */ | |
3933 | ret = ext4_ext_check_inode(inode); | |
3934 | } else if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
3935 | (S_ISLNK(inode->i_mode) && | |
3936 | !ext4_inode_is_fast_symlink(inode))) { | |
3937 | /* Validate block references which are part of inode */ | |
3938 | ret = ext4_ind_check_inode(inode); | |
3939 | } | |
fe2c8191 | 3940 | } |
567f3e9a | 3941 | if (ret) |
de9a55b8 | 3942 | goto bad_inode; |
7a262f7c | 3943 | |
ac27a0ec | 3944 | if (S_ISREG(inode->i_mode)) { |
617ba13b MC |
3945 | inode->i_op = &ext4_file_inode_operations; |
3946 | inode->i_fop = &ext4_file_operations; | |
3947 | ext4_set_aops(inode); | |
ac27a0ec | 3948 | } else if (S_ISDIR(inode->i_mode)) { |
617ba13b MC |
3949 | inode->i_op = &ext4_dir_inode_operations; |
3950 | inode->i_fop = &ext4_dir_operations; | |
ac27a0ec | 3951 | } else if (S_ISLNK(inode->i_mode)) { |
e83c1397 | 3952 | if (ext4_inode_is_fast_symlink(inode)) { |
617ba13b | 3953 | inode->i_op = &ext4_fast_symlink_inode_operations; |
e83c1397 DG |
3954 | nd_terminate_link(ei->i_data, inode->i_size, |
3955 | sizeof(ei->i_data) - 1); | |
3956 | } else { | |
617ba13b MC |
3957 | inode->i_op = &ext4_symlink_inode_operations; |
3958 | ext4_set_aops(inode); | |
ac27a0ec | 3959 | } |
563bdd61 TT |
3960 | } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || |
3961 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
617ba13b | 3962 | inode->i_op = &ext4_special_inode_operations; |
ac27a0ec DK |
3963 | if (raw_inode->i_block[0]) |
3964 | init_special_inode(inode, inode->i_mode, | |
3965 | old_decode_dev(le32_to_cpu(raw_inode->i_block[0]))); | |
3966 | else | |
3967 | init_special_inode(inode, inode->i_mode, | |
3968 | new_decode_dev(le32_to_cpu(raw_inode->i_block[1]))); | |
563bdd61 | 3969 | } else { |
563bdd61 | 3970 | ret = -EIO; |
24676da4 | 3971 | EXT4_ERROR_INODE(inode, "bogus i_mode (%o)", inode->i_mode); |
563bdd61 | 3972 | goto bad_inode; |
ac27a0ec | 3973 | } |
af5bc92d | 3974 | brelse(iloc.bh); |
617ba13b | 3975 | ext4_set_inode_flags(inode); |
1d1fe1ee DH |
3976 | unlock_new_inode(inode); |
3977 | return inode; | |
ac27a0ec DK |
3978 | |
3979 | bad_inode: | |
567f3e9a | 3980 | brelse(iloc.bh); |
1d1fe1ee DH |
3981 | iget_failed(inode); |
3982 | return ERR_PTR(ret); | |
ac27a0ec DK |
3983 | } |
3984 | ||
0fc1b451 AK |
3985 | static int ext4_inode_blocks_set(handle_t *handle, |
3986 | struct ext4_inode *raw_inode, | |
3987 | struct ext4_inode_info *ei) | |
3988 | { | |
3989 | struct inode *inode = &(ei->vfs_inode); | |
3990 | u64 i_blocks = inode->i_blocks; | |
3991 | struct super_block *sb = inode->i_sb; | |
0fc1b451 AK |
3992 | |
3993 | if (i_blocks <= ~0U) { | |
3994 | /* | |
4907cb7b | 3995 | * i_blocks can be represented in a 32 bit variable |
0fc1b451 AK |
3996 | * as multiple of 512 bytes |
3997 | */ | |
8180a562 | 3998 | raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); |
0fc1b451 | 3999 | raw_inode->i_blocks_high = 0; |
84a8dce2 | 4000 | ext4_clear_inode_flag(inode, EXT4_INODE_HUGE_FILE); |
f287a1a5 TT |
4001 | return 0; |
4002 | } | |
4003 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) | |
4004 | return -EFBIG; | |
4005 | ||
4006 | if (i_blocks <= 0xffffffffffffULL) { | |
0fc1b451 AK |
4007 | /* |
4008 | * i_blocks can be represented in a 48 bit variable | |
4009 | * as multiple of 512 bytes | |
4010 | */ | |
8180a562 | 4011 | raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); |
0fc1b451 | 4012 | raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32); |
84a8dce2 | 4013 | ext4_clear_inode_flag(inode, EXT4_INODE_HUGE_FILE); |
0fc1b451 | 4014 | } else { |
84a8dce2 | 4015 | ext4_set_inode_flag(inode, EXT4_INODE_HUGE_FILE); |
8180a562 AK |
4016 | /* i_block is stored in file system block size */ |
4017 | i_blocks = i_blocks >> (inode->i_blkbits - 9); | |
4018 | raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); | |
4019 | raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32); | |
0fc1b451 | 4020 | } |
f287a1a5 | 4021 | return 0; |
0fc1b451 AK |
4022 | } |
4023 | ||
ac27a0ec DK |
4024 | /* |
4025 | * Post the struct inode info into an on-disk inode location in the | |
4026 | * buffer-cache. This gobbles the caller's reference to the | |
4027 | * buffer_head in the inode location struct. | |
4028 | * | |
4029 | * The caller must have write access to iloc->bh. | |
4030 | */ | |
617ba13b | 4031 | static int ext4_do_update_inode(handle_t *handle, |
ac27a0ec | 4032 | struct inode *inode, |
830156c7 | 4033 | struct ext4_iloc *iloc) |
ac27a0ec | 4034 | { |
617ba13b MC |
4035 | struct ext4_inode *raw_inode = ext4_raw_inode(iloc); |
4036 | struct ext4_inode_info *ei = EXT4_I(inode); | |
ac27a0ec DK |
4037 | struct buffer_head *bh = iloc->bh; |
4038 | int err = 0, rc, block; | |
b71fc079 | 4039 | int need_datasync = 0; |
08cefc7a EB |
4040 | uid_t i_uid; |
4041 | gid_t i_gid; | |
ac27a0ec DK |
4042 | |
4043 | /* For fields not not tracking in the in-memory inode, | |
4044 | * initialise them to zero for new inodes. */ | |
19f5fb7a | 4045 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) |
617ba13b | 4046 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); |
ac27a0ec | 4047 | |
ff9ddf7e | 4048 | ext4_get_inode_flags(ei); |
ac27a0ec | 4049 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); |
08cefc7a EB |
4050 | i_uid = i_uid_read(inode); |
4051 | i_gid = i_gid_read(inode); | |
af5bc92d | 4052 | if (!(test_opt(inode->i_sb, NO_UID32))) { |
08cefc7a EB |
4053 | raw_inode->i_uid_low = cpu_to_le16(low_16_bits(i_uid)); |
4054 | raw_inode->i_gid_low = cpu_to_le16(low_16_bits(i_gid)); | |
ac27a0ec DK |
4055 | /* |
4056 | * Fix up interoperability with old kernels. Otherwise, old inodes get | |
4057 | * re-used with the upper 16 bits of the uid/gid intact | |
4058 | */ | |
af5bc92d | 4059 | if (!ei->i_dtime) { |
ac27a0ec | 4060 | raw_inode->i_uid_high = |
08cefc7a | 4061 | cpu_to_le16(high_16_bits(i_uid)); |
ac27a0ec | 4062 | raw_inode->i_gid_high = |
08cefc7a | 4063 | cpu_to_le16(high_16_bits(i_gid)); |
ac27a0ec DK |
4064 | } else { |
4065 | raw_inode->i_uid_high = 0; | |
4066 | raw_inode->i_gid_high = 0; | |
4067 | } | |
4068 | } else { | |
08cefc7a EB |
4069 | raw_inode->i_uid_low = cpu_to_le16(fs_high2lowuid(i_uid)); |
4070 | raw_inode->i_gid_low = cpu_to_le16(fs_high2lowgid(i_gid)); | |
ac27a0ec DK |
4071 | raw_inode->i_uid_high = 0; |
4072 | raw_inode->i_gid_high = 0; | |
4073 | } | |
4074 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); | |
ef7f3835 KS |
4075 | |
4076 | EXT4_INODE_SET_XTIME(i_ctime, inode, raw_inode); | |
4077 | EXT4_INODE_SET_XTIME(i_mtime, inode, raw_inode); | |
4078 | EXT4_INODE_SET_XTIME(i_atime, inode, raw_inode); | |
4079 | EXT4_EINODE_SET_XTIME(i_crtime, ei, raw_inode); | |
4080 | ||
0fc1b451 AK |
4081 | if (ext4_inode_blocks_set(handle, raw_inode, ei)) |
4082 | goto out_brelse; | |
ac27a0ec | 4083 | raw_inode->i_dtime = cpu_to_le32(ei->i_dtime); |
353eb83c | 4084 | raw_inode->i_flags = cpu_to_le32(ei->i_flags & 0xFFFFFFFF); |
9b8f1f01 MC |
4085 | if (EXT4_SB(inode->i_sb)->s_es->s_creator_os != |
4086 | cpu_to_le32(EXT4_OS_HURD)) | |
a1ddeb7e BP |
4087 | raw_inode->i_file_acl_high = |
4088 | cpu_to_le16(ei->i_file_acl >> 32); | |
7973c0c1 | 4089 | raw_inode->i_file_acl_lo = cpu_to_le32(ei->i_file_acl); |
b71fc079 JK |
4090 | if (ei->i_disksize != ext4_isize(raw_inode)) { |
4091 | ext4_isize_set(raw_inode, ei->i_disksize); | |
4092 | need_datasync = 1; | |
4093 | } | |
a48380f7 AK |
4094 | if (ei->i_disksize > 0x7fffffffULL) { |
4095 | struct super_block *sb = inode->i_sb; | |
4096 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
4097 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE) || | |
4098 | EXT4_SB(sb)->s_es->s_rev_level == | |
4099 | cpu_to_le32(EXT4_GOOD_OLD_REV)) { | |
4100 | /* If this is the first large file | |
4101 | * created, add a flag to the superblock. | |
4102 | */ | |
4103 | err = ext4_journal_get_write_access(handle, | |
4104 | EXT4_SB(sb)->s_sbh); | |
4105 | if (err) | |
4106 | goto out_brelse; | |
4107 | ext4_update_dynamic_rev(sb); | |
4108 | EXT4_SET_RO_COMPAT_FEATURE(sb, | |
617ba13b | 4109 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE); |
0390131b | 4110 | ext4_handle_sync(handle); |
b50924c2 | 4111 | err = ext4_handle_dirty_super(handle, sb); |
ac27a0ec DK |
4112 | } |
4113 | } | |
4114 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); | |
4115 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
4116 | if (old_valid_dev(inode->i_rdev)) { | |
4117 | raw_inode->i_block[0] = | |
4118 | cpu_to_le32(old_encode_dev(inode->i_rdev)); | |
4119 | raw_inode->i_block[1] = 0; | |
4120 | } else { | |
4121 | raw_inode->i_block[0] = 0; | |
4122 | raw_inode->i_block[1] = | |
4123 | cpu_to_le32(new_encode_dev(inode->i_rdev)); | |
4124 | raw_inode->i_block[2] = 0; | |
4125 | } | |
f19d5870 | 4126 | } else if (!ext4_has_inline_data(inode)) { |
de9a55b8 TT |
4127 | for (block = 0; block < EXT4_N_BLOCKS; block++) |
4128 | raw_inode->i_block[block] = ei->i_data[block]; | |
f19d5870 | 4129 | } |
ac27a0ec | 4130 | |
25ec56b5 JNC |
4131 | raw_inode->i_disk_version = cpu_to_le32(inode->i_version); |
4132 | if (ei->i_extra_isize) { | |
4133 | if (EXT4_FITS_IN_INODE(raw_inode, ei, i_version_hi)) | |
4134 | raw_inode->i_version_hi = | |
4135 | cpu_to_le32(inode->i_version >> 32); | |
ac27a0ec | 4136 | raw_inode->i_extra_isize = cpu_to_le16(ei->i_extra_isize); |
25ec56b5 JNC |
4137 | } |
4138 | ||
814525f4 DW |
4139 | ext4_inode_csum_set(inode, raw_inode, ei); |
4140 | ||
830156c7 | 4141 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); |
73b50c1c | 4142 | rc = ext4_handle_dirty_metadata(handle, NULL, bh); |
830156c7 FM |
4143 | if (!err) |
4144 | err = rc; | |
19f5fb7a | 4145 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec | 4146 | |
b71fc079 | 4147 | ext4_update_inode_fsync_trans(handle, inode, need_datasync); |
ac27a0ec | 4148 | out_brelse: |
af5bc92d | 4149 | brelse(bh); |
617ba13b | 4150 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
4151 | return err; |
4152 | } | |
4153 | ||
4154 | /* | |
617ba13b | 4155 | * ext4_write_inode() |
ac27a0ec DK |
4156 | * |
4157 | * We are called from a few places: | |
4158 | * | |
4159 | * - Within generic_file_write() for O_SYNC files. | |
4160 | * Here, there will be no transaction running. We wait for any running | |
4907cb7b | 4161 | * transaction to commit. |
ac27a0ec DK |
4162 | * |
4163 | * - Within sys_sync(), kupdate and such. | |
4164 | * We wait on commit, if tol to. | |
4165 | * | |
4166 | * - Within prune_icache() (PF_MEMALLOC == true) | |
4167 | * Here we simply return. We can't afford to block kswapd on the | |
4168 | * journal commit. | |
4169 | * | |
4170 | * In all cases it is actually safe for us to return without doing anything, | |
4171 | * because the inode has been copied into a raw inode buffer in | |
617ba13b | 4172 | * ext4_mark_inode_dirty(). This is a correctness thing for O_SYNC and for |
ac27a0ec DK |
4173 | * knfsd. |
4174 | * | |
4175 | * Note that we are absolutely dependent upon all inode dirtiers doing the | |
4176 | * right thing: they *must* call mark_inode_dirty() after dirtying info in | |
4177 | * which we are interested. | |
4178 | * | |
4179 | * It would be a bug for them to not do this. The code: | |
4180 | * | |
4181 | * mark_inode_dirty(inode) | |
4182 | * stuff(); | |
4183 | * inode->i_size = expr; | |
4184 | * | |
4185 | * is in error because a kswapd-driven write_inode() could occur while | |
4186 | * `stuff()' is running, and the new i_size will be lost. Plus the inode | |
4187 | * will no longer be on the superblock's dirty inode list. | |
4188 | */ | |
a9185b41 | 4189 | int ext4_write_inode(struct inode *inode, struct writeback_control *wbc) |
ac27a0ec | 4190 | { |
91ac6f43 FM |
4191 | int err; |
4192 | ||
ac27a0ec DK |
4193 | if (current->flags & PF_MEMALLOC) |
4194 | return 0; | |
4195 | ||
91ac6f43 FM |
4196 | if (EXT4_SB(inode->i_sb)->s_journal) { |
4197 | if (ext4_journal_current_handle()) { | |
4198 | jbd_debug(1, "called recursively, non-PF_MEMALLOC!\n"); | |
4199 | dump_stack(); | |
4200 | return -EIO; | |
4201 | } | |
ac27a0ec | 4202 | |
a9185b41 | 4203 | if (wbc->sync_mode != WB_SYNC_ALL) |
91ac6f43 FM |
4204 | return 0; |
4205 | ||
4206 | err = ext4_force_commit(inode->i_sb); | |
4207 | } else { | |
4208 | struct ext4_iloc iloc; | |
ac27a0ec | 4209 | |
8b472d73 | 4210 | err = __ext4_get_inode_loc(inode, &iloc, 0); |
91ac6f43 FM |
4211 | if (err) |
4212 | return err; | |
a9185b41 | 4213 | if (wbc->sync_mode == WB_SYNC_ALL) |
830156c7 FM |
4214 | sync_dirty_buffer(iloc.bh); |
4215 | if (buffer_req(iloc.bh) && !buffer_uptodate(iloc.bh)) { | |
c398eda0 TT |
4216 | EXT4_ERROR_INODE_BLOCK(inode, iloc.bh->b_blocknr, |
4217 | "IO error syncing inode"); | |
830156c7 FM |
4218 | err = -EIO; |
4219 | } | |
fd2dd9fb | 4220 | brelse(iloc.bh); |
91ac6f43 FM |
4221 | } |
4222 | return err; | |
ac27a0ec DK |
4223 | } |
4224 | ||
4225 | /* | |
617ba13b | 4226 | * ext4_setattr() |
ac27a0ec DK |
4227 | * |
4228 | * Called from notify_change. | |
4229 | * | |
4230 | * We want to trap VFS attempts to truncate the file as soon as | |
4231 | * possible. In particular, we want to make sure that when the VFS | |
4232 | * shrinks i_size, we put the inode on the orphan list and modify | |
4233 | * i_disksize immediately, so that during the subsequent flushing of | |
4234 | * dirty pages and freeing of disk blocks, we can guarantee that any | |
4235 | * commit will leave the blocks being flushed in an unused state on | |
4236 | * disk. (On recovery, the inode will get truncated and the blocks will | |
4237 | * be freed, so we have a strong guarantee that no future commit will | |
4238 | * leave these blocks visible to the user.) | |
4239 | * | |
678aaf48 JK |
4240 | * Another thing we have to assure is that if we are in ordered mode |
4241 | * and inode is still attached to the committing transaction, we must | |
4242 | * we start writeout of all the dirty pages which are being truncated. | |
4243 | * This way we are sure that all the data written in the previous | |
4244 | * transaction are already on disk (truncate waits for pages under | |
4245 | * writeback). | |
4246 | * | |
4247 | * Called with inode->i_mutex down. | |
ac27a0ec | 4248 | */ |
617ba13b | 4249 | int ext4_setattr(struct dentry *dentry, struct iattr *attr) |
ac27a0ec DK |
4250 | { |
4251 | struct inode *inode = dentry->d_inode; | |
4252 | int error, rc = 0; | |
3d287de3 | 4253 | int orphan = 0; |
ac27a0ec DK |
4254 | const unsigned int ia_valid = attr->ia_valid; |
4255 | ||
4256 | error = inode_change_ok(inode, attr); | |
4257 | if (error) | |
4258 | return error; | |
4259 | ||
12755627 | 4260 | if (is_quota_modification(inode, attr)) |
871a2931 | 4261 | dquot_initialize(inode); |
08cefc7a EB |
4262 | if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) || |
4263 | (ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) { | |
ac27a0ec DK |
4264 | handle_t *handle; |
4265 | ||
4266 | /* (user+group)*(old+new) structure, inode write (sb, | |
4267 | * inode block, ? - but truncate inode update has it) */ | |
5aca07eb | 4268 | handle = ext4_journal_start(inode, (EXT4_MAXQUOTAS_INIT_BLOCKS(inode->i_sb)+ |
194074ac | 4269 | EXT4_MAXQUOTAS_DEL_BLOCKS(inode->i_sb))+3); |
ac27a0ec DK |
4270 | if (IS_ERR(handle)) { |
4271 | error = PTR_ERR(handle); | |
4272 | goto err_out; | |
4273 | } | |
b43fa828 | 4274 | error = dquot_transfer(inode, attr); |
ac27a0ec | 4275 | if (error) { |
617ba13b | 4276 | ext4_journal_stop(handle); |
ac27a0ec DK |
4277 | return error; |
4278 | } | |
4279 | /* Update corresponding info in inode so that everything is in | |
4280 | * one transaction */ | |
4281 | if (attr->ia_valid & ATTR_UID) | |
4282 | inode->i_uid = attr->ia_uid; | |
4283 | if (attr->ia_valid & ATTR_GID) | |
4284 | inode->i_gid = attr->ia_gid; | |
617ba13b MC |
4285 | error = ext4_mark_inode_dirty(handle, inode); |
4286 | ext4_journal_stop(handle); | |
ac27a0ec DK |
4287 | } |
4288 | ||
e2b46574 | 4289 | if (attr->ia_valid & ATTR_SIZE) { |
562c72aa | 4290 | |
12e9b892 | 4291 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) { |
e2b46574 ES |
4292 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
4293 | ||
0c095c7f TT |
4294 | if (attr->ia_size > sbi->s_bitmap_maxbytes) |
4295 | return -EFBIG; | |
e2b46574 ES |
4296 | } |
4297 | } | |
4298 | ||
ac27a0ec | 4299 | if (S_ISREG(inode->i_mode) && |
c8d46e41 | 4300 | attr->ia_valid & ATTR_SIZE && |
072bd7ea | 4301 | (attr->ia_size < inode->i_size)) { |
ac27a0ec DK |
4302 | handle_t *handle; |
4303 | ||
617ba13b | 4304 | handle = ext4_journal_start(inode, 3); |
ac27a0ec DK |
4305 | if (IS_ERR(handle)) { |
4306 | error = PTR_ERR(handle); | |
4307 | goto err_out; | |
4308 | } | |
3d287de3 DM |
4309 | if (ext4_handle_valid(handle)) { |
4310 | error = ext4_orphan_add(handle, inode); | |
4311 | orphan = 1; | |
4312 | } | |
617ba13b MC |
4313 | EXT4_I(inode)->i_disksize = attr->ia_size; |
4314 | rc = ext4_mark_inode_dirty(handle, inode); | |
ac27a0ec DK |
4315 | if (!error) |
4316 | error = rc; | |
617ba13b | 4317 | ext4_journal_stop(handle); |
678aaf48 JK |
4318 | |
4319 | if (ext4_should_order_data(inode)) { | |
4320 | error = ext4_begin_ordered_truncate(inode, | |
4321 | attr->ia_size); | |
4322 | if (error) { | |
4323 | /* Do as much error cleanup as possible */ | |
4324 | handle = ext4_journal_start(inode, 3); | |
4325 | if (IS_ERR(handle)) { | |
4326 | ext4_orphan_del(NULL, inode); | |
4327 | goto err_out; | |
4328 | } | |
4329 | ext4_orphan_del(handle, inode); | |
3d287de3 | 4330 | orphan = 0; |
678aaf48 JK |
4331 | ext4_journal_stop(handle); |
4332 | goto err_out; | |
4333 | } | |
4334 | } | |
ac27a0ec DK |
4335 | } |
4336 | ||
072bd7ea | 4337 | if (attr->ia_valid & ATTR_SIZE) { |
1c9114f9 | 4338 | if (attr->ia_size != i_size_read(inode)) { |
072bd7ea | 4339 | truncate_setsize(inode, attr->ia_size); |
1b65007e DM |
4340 | /* Inode size will be reduced, wait for dio in flight. |
4341 | * Temporarily disable dioread_nolock to prevent | |
4342 | * livelock. */ | |
4343 | if (orphan) { | |
4344 | ext4_inode_block_unlocked_dio(inode); | |
1c9114f9 | 4345 | inode_dio_wait(inode); |
1b65007e DM |
4346 | ext4_inode_resume_unlocked_dio(inode); |
4347 | } | |
1c9114f9 | 4348 | } |
afcff5d8 | 4349 | ext4_truncate(inode); |
072bd7ea | 4350 | } |
ac27a0ec | 4351 | |
1025774c CH |
4352 | if (!rc) { |
4353 | setattr_copy(inode, attr); | |
4354 | mark_inode_dirty(inode); | |
4355 | } | |
4356 | ||
4357 | /* | |
4358 | * If the call to ext4_truncate failed to get a transaction handle at | |
4359 | * all, we need to clean up the in-core orphan list manually. | |
4360 | */ | |
3d287de3 | 4361 | if (orphan && inode->i_nlink) |
617ba13b | 4362 | ext4_orphan_del(NULL, inode); |
ac27a0ec DK |
4363 | |
4364 | if (!rc && (ia_valid & ATTR_MODE)) | |
617ba13b | 4365 | rc = ext4_acl_chmod(inode); |
ac27a0ec DK |
4366 | |
4367 | err_out: | |
617ba13b | 4368 | ext4_std_error(inode->i_sb, error); |
ac27a0ec DK |
4369 | if (!error) |
4370 | error = rc; | |
4371 | return error; | |
4372 | } | |
4373 | ||
3e3398a0 MC |
4374 | int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, |
4375 | struct kstat *stat) | |
4376 | { | |
4377 | struct inode *inode; | |
4378 | unsigned long delalloc_blocks; | |
4379 | ||
4380 | inode = dentry->d_inode; | |
4381 | generic_fillattr(inode, stat); | |
4382 | ||
4383 | /* | |
4384 | * We can't update i_blocks if the block allocation is delayed | |
4385 | * otherwise in the case of system crash before the real block | |
4386 | * allocation is done, we will have i_blocks inconsistent with | |
4387 | * on-disk file blocks. | |
4388 | * We always keep i_blocks updated together with real | |
4389 | * allocation. But to not confuse with user, stat | |
4390 | * will return the blocks that include the delayed allocation | |
4391 | * blocks for this file. | |
4392 | */ | |
96607551 TM |
4393 | delalloc_blocks = EXT4_C2B(EXT4_SB(inode->i_sb), |
4394 | EXT4_I(inode)->i_reserved_data_blocks); | |
3e3398a0 MC |
4395 | |
4396 | stat->blocks += (delalloc_blocks << inode->i_sb->s_blocksize_bits)>>9; | |
4397 | return 0; | |
4398 | } | |
ac27a0ec | 4399 | |
a02908f1 MC |
4400 | static int ext4_index_trans_blocks(struct inode *inode, int nrblocks, int chunk) |
4401 | { | |
12e9b892 | 4402 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
8bb2b247 | 4403 | return ext4_ind_trans_blocks(inode, nrblocks, chunk); |
ac51d837 | 4404 | return ext4_ext_index_trans_blocks(inode, nrblocks, chunk); |
a02908f1 | 4405 | } |
ac51d837 | 4406 | |
ac27a0ec | 4407 | /* |
a02908f1 MC |
4408 | * Account for index blocks, block groups bitmaps and block group |
4409 | * descriptor blocks if modify datablocks and index blocks | |
4410 | * worse case, the indexs blocks spread over different block groups | |
ac27a0ec | 4411 | * |
a02908f1 | 4412 | * If datablocks are discontiguous, they are possible to spread over |
4907cb7b | 4413 | * different block groups too. If they are contiguous, with flexbg, |
a02908f1 | 4414 | * they could still across block group boundary. |
ac27a0ec | 4415 | * |
a02908f1 MC |
4416 | * Also account for superblock, inode, quota and xattr blocks |
4417 | */ | |
1f109d5a | 4418 | static int ext4_meta_trans_blocks(struct inode *inode, int nrblocks, int chunk) |
a02908f1 | 4419 | { |
8df9675f TT |
4420 | ext4_group_t groups, ngroups = ext4_get_groups_count(inode->i_sb); |
4421 | int gdpblocks; | |
a02908f1 MC |
4422 | int idxblocks; |
4423 | int ret = 0; | |
4424 | ||
4425 | /* | |
4426 | * How many index blocks need to touch to modify nrblocks? | |
4427 | * The "Chunk" flag indicating whether the nrblocks is | |
4428 | * physically contiguous on disk | |
4429 | * | |
4430 | * For Direct IO and fallocate, they calls get_block to allocate | |
4431 | * one single extent at a time, so they could set the "Chunk" flag | |
4432 | */ | |
4433 | idxblocks = ext4_index_trans_blocks(inode, nrblocks, chunk); | |
4434 | ||
4435 | ret = idxblocks; | |
4436 | ||
4437 | /* | |
4438 | * Now let's see how many group bitmaps and group descriptors need | |
4439 | * to account | |
4440 | */ | |
4441 | groups = idxblocks; | |
4442 | if (chunk) | |
4443 | groups += 1; | |
4444 | else | |
4445 | groups += nrblocks; | |
4446 | ||
4447 | gdpblocks = groups; | |
8df9675f TT |
4448 | if (groups > ngroups) |
4449 | groups = ngroups; | |
a02908f1 MC |
4450 | if (groups > EXT4_SB(inode->i_sb)->s_gdb_count) |
4451 | gdpblocks = EXT4_SB(inode->i_sb)->s_gdb_count; | |
4452 | ||
4453 | /* bitmaps and block group descriptor blocks */ | |
4454 | ret += groups + gdpblocks; | |
4455 | ||
4456 | /* Blocks for super block, inode, quota and xattr blocks */ | |
4457 | ret += EXT4_META_TRANS_BLOCKS(inode->i_sb); | |
4458 | ||
4459 | return ret; | |
4460 | } | |
4461 | ||
4462 | /* | |
25985edc | 4463 | * Calculate the total number of credits to reserve to fit |
f3bd1f3f MC |
4464 | * the modification of a single pages into a single transaction, |
4465 | * which may include multiple chunks of block allocations. | |
ac27a0ec | 4466 | * |
525f4ed8 | 4467 | * This could be called via ext4_write_begin() |
ac27a0ec | 4468 | * |
525f4ed8 | 4469 | * We need to consider the worse case, when |
a02908f1 | 4470 | * one new block per extent. |
ac27a0ec | 4471 | */ |
a86c6181 | 4472 | int ext4_writepage_trans_blocks(struct inode *inode) |
ac27a0ec | 4473 | { |
617ba13b | 4474 | int bpp = ext4_journal_blocks_per_page(inode); |
ac27a0ec DK |
4475 | int ret; |
4476 | ||
a02908f1 | 4477 | ret = ext4_meta_trans_blocks(inode, bpp, 0); |
a86c6181 | 4478 | |
a02908f1 | 4479 | /* Account for data blocks for journalled mode */ |
617ba13b | 4480 | if (ext4_should_journal_data(inode)) |
a02908f1 | 4481 | ret += bpp; |
ac27a0ec DK |
4482 | return ret; |
4483 | } | |
f3bd1f3f MC |
4484 | |
4485 | /* | |
4486 | * Calculate the journal credits for a chunk of data modification. | |
4487 | * | |
4488 | * This is called from DIO, fallocate or whoever calling | |
79e83036 | 4489 | * ext4_map_blocks() to map/allocate a chunk of contiguous disk blocks. |
f3bd1f3f MC |
4490 | * |
4491 | * journal buffers for data blocks are not included here, as DIO | |
4492 | * and fallocate do no need to journal data buffers. | |
4493 | */ | |
4494 | int ext4_chunk_trans_blocks(struct inode *inode, int nrblocks) | |
4495 | { | |
4496 | return ext4_meta_trans_blocks(inode, nrblocks, 1); | |
4497 | } | |
4498 | ||
ac27a0ec | 4499 | /* |
617ba13b | 4500 | * The caller must have previously called ext4_reserve_inode_write(). |
ac27a0ec DK |
4501 | * Give this, we know that the caller already has write access to iloc->bh. |
4502 | */ | |
617ba13b | 4503 | int ext4_mark_iloc_dirty(handle_t *handle, |
de9a55b8 | 4504 | struct inode *inode, struct ext4_iloc *iloc) |
ac27a0ec DK |
4505 | { |
4506 | int err = 0; | |
4507 | ||
c64db50e | 4508 | if (IS_I_VERSION(inode)) |
25ec56b5 JNC |
4509 | inode_inc_iversion(inode); |
4510 | ||
ac27a0ec DK |
4511 | /* the do_update_inode consumes one bh->b_count */ |
4512 | get_bh(iloc->bh); | |
4513 | ||
dab291af | 4514 | /* ext4_do_update_inode() does jbd2_journal_dirty_metadata */ |
830156c7 | 4515 | err = ext4_do_update_inode(handle, inode, iloc); |
ac27a0ec DK |
4516 | put_bh(iloc->bh); |
4517 | return err; | |
4518 | } | |
4519 | ||
4520 | /* | |
4521 | * On success, We end up with an outstanding reference count against | |
4522 | * iloc->bh. This _must_ be cleaned up later. | |
4523 | */ | |
4524 | ||
4525 | int | |
617ba13b MC |
4526 | ext4_reserve_inode_write(handle_t *handle, struct inode *inode, |
4527 | struct ext4_iloc *iloc) | |
ac27a0ec | 4528 | { |
0390131b FM |
4529 | int err; |
4530 | ||
4531 | err = ext4_get_inode_loc(inode, iloc); | |
4532 | if (!err) { | |
4533 | BUFFER_TRACE(iloc->bh, "get_write_access"); | |
4534 | err = ext4_journal_get_write_access(handle, iloc->bh); | |
4535 | if (err) { | |
4536 | brelse(iloc->bh); | |
4537 | iloc->bh = NULL; | |
ac27a0ec DK |
4538 | } |
4539 | } | |
617ba13b | 4540 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
4541 | return err; |
4542 | } | |
4543 | ||
6dd4ee7c KS |
4544 | /* |
4545 | * Expand an inode by new_extra_isize bytes. | |
4546 | * Returns 0 on success or negative error number on failure. | |
4547 | */ | |
1d03ec98 AK |
4548 | static int ext4_expand_extra_isize(struct inode *inode, |
4549 | unsigned int new_extra_isize, | |
4550 | struct ext4_iloc iloc, | |
4551 | handle_t *handle) | |
6dd4ee7c KS |
4552 | { |
4553 | struct ext4_inode *raw_inode; | |
4554 | struct ext4_xattr_ibody_header *header; | |
6dd4ee7c KS |
4555 | |
4556 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) | |
4557 | return 0; | |
4558 | ||
4559 | raw_inode = ext4_raw_inode(&iloc); | |
4560 | ||
4561 | header = IHDR(inode, raw_inode); | |
6dd4ee7c KS |
4562 | |
4563 | /* No extended attributes present */ | |
19f5fb7a TT |
4564 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR) || |
4565 | header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)) { | |
6dd4ee7c KS |
4566 | memset((void *)raw_inode + EXT4_GOOD_OLD_INODE_SIZE, 0, |
4567 | new_extra_isize); | |
4568 | EXT4_I(inode)->i_extra_isize = new_extra_isize; | |
4569 | return 0; | |
4570 | } | |
4571 | ||
4572 | /* try to expand with EAs present */ | |
4573 | return ext4_expand_extra_isize_ea(inode, new_extra_isize, | |
4574 | raw_inode, handle); | |
4575 | } | |
4576 | ||
ac27a0ec DK |
4577 | /* |
4578 | * What we do here is to mark the in-core inode as clean with respect to inode | |
4579 | * dirtiness (it may still be data-dirty). | |
4580 | * This means that the in-core inode may be reaped by prune_icache | |
4581 | * without having to perform any I/O. This is a very good thing, | |
4582 | * because *any* task may call prune_icache - even ones which | |
4583 | * have a transaction open against a different journal. | |
4584 | * | |
4585 | * Is this cheating? Not really. Sure, we haven't written the | |
4586 | * inode out, but prune_icache isn't a user-visible syncing function. | |
4587 | * Whenever the user wants stuff synced (sys_sync, sys_msync, sys_fsync) | |
4588 | * we start and wait on commits. | |
ac27a0ec | 4589 | */ |
617ba13b | 4590 | int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode) |
ac27a0ec | 4591 | { |
617ba13b | 4592 | struct ext4_iloc iloc; |
6dd4ee7c KS |
4593 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
4594 | static unsigned int mnt_count; | |
4595 | int err, ret; | |
ac27a0ec DK |
4596 | |
4597 | might_sleep(); | |
7ff9c073 | 4598 | trace_ext4_mark_inode_dirty(inode, _RET_IP_); |
617ba13b | 4599 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
0390131b FM |
4600 | if (ext4_handle_valid(handle) && |
4601 | EXT4_I(inode)->i_extra_isize < sbi->s_want_extra_isize && | |
19f5fb7a | 4602 | !ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND)) { |
6dd4ee7c KS |
4603 | /* |
4604 | * We need extra buffer credits since we may write into EA block | |
4605 | * with this same handle. If journal_extend fails, then it will | |
4606 | * only result in a minor loss of functionality for that inode. | |
4607 | * If this is felt to be critical, then e2fsck should be run to | |
4608 | * force a large enough s_min_extra_isize. | |
4609 | */ | |
4610 | if ((jbd2_journal_extend(handle, | |
4611 | EXT4_DATA_TRANS_BLOCKS(inode->i_sb))) == 0) { | |
4612 | ret = ext4_expand_extra_isize(inode, | |
4613 | sbi->s_want_extra_isize, | |
4614 | iloc, handle); | |
4615 | if (ret) { | |
19f5fb7a TT |
4616 | ext4_set_inode_state(inode, |
4617 | EXT4_STATE_NO_EXPAND); | |
c1bddad9 AK |
4618 | if (mnt_count != |
4619 | le16_to_cpu(sbi->s_es->s_mnt_count)) { | |
12062ddd | 4620 | ext4_warning(inode->i_sb, |
6dd4ee7c KS |
4621 | "Unable to expand inode %lu. Delete" |
4622 | " some EAs or run e2fsck.", | |
4623 | inode->i_ino); | |
c1bddad9 AK |
4624 | mnt_count = |
4625 | le16_to_cpu(sbi->s_es->s_mnt_count); | |
6dd4ee7c KS |
4626 | } |
4627 | } | |
4628 | } | |
4629 | } | |
ac27a0ec | 4630 | if (!err) |
617ba13b | 4631 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec DK |
4632 | return err; |
4633 | } | |
4634 | ||
4635 | /* | |
617ba13b | 4636 | * ext4_dirty_inode() is called from __mark_inode_dirty() |
ac27a0ec DK |
4637 | * |
4638 | * We're really interested in the case where a file is being extended. | |
4639 | * i_size has been changed by generic_commit_write() and we thus need | |
4640 | * to include the updated inode in the current transaction. | |
4641 | * | |
5dd4056d | 4642 | * Also, dquot_alloc_block() will always dirty the inode when blocks |
ac27a0ec DK |
4643 | * are allocated to the file. |
4644 | * | |
4645 | * If the inode is marked synchronous, we don't honour that here - doing | |
4646 | * so would cause a commit on atime updates, which we don't bother doing. | |
4647 | * We handle synchronous inodes at the highest possible level. | |
4648 | */ | |
aa385729 | 4649 | void ext4_dirty_inode(struct inode *inode, int flags) |
ac27a0ec | 4650 | { |
ac27a0ec DK |
4651 | handle_t *handle; |
4652 | ||
617ba13b | 4653 | handle = ext4_journal_start(inode, 2); |
ac27a0ec DK |
4654 | if (IS_ERR(handle)) |
4655 | goto out; | |
f3dc272f | 4656 | |
f3dc272f CW |
4657 | ext4_mark_inode_dirty(handle, inode); |
4658 | ||
617ba13b | 4659 | ext4_journal_stop(handle); |
ac27a0ec DK |
4660 | out: |
4661 | return; | |
4662 | } | |
4663 | ||
4664 | #if 0 | |
4665 | /* | |
4666 | * Bind an inode's backing buffer_head into this transaction, to prevent | |
4667 | * it from being flushed to disk early. Unlike | |
617ba13b | 4668 | * ext4_reserve_inode_write, this leaves behind no bh reference and |
ac27a0ec DK |
4669 | * returns no iloc structure, so the caller needs to repeat the iloc |
4670 | * lookup to mark the inode dirty later. | |
4671 | */ | |
617ba13b | 4672 | static int ext4_pin_inode(handle_t *handle, struct inode *inode) |
ac27a0ec | 4673 | { |
617ba13b | 4674 | struct ext4_iloc iloc; |
ac27a0ec DK |
4675 | |
4676 | int err = 0; | |
4677 | if (handle) { | |
617ba13b | 4678 | err = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
4679 | if (!err) { |
4680 | BUFFER_TRACE(iloc.bh, "get_write_access"); | |
dab291af | 4681 | err = jbd2_journal_get_write_access(handle, iloc.bh); |
ac27a0ec | 4682 | if (!err) |
0390131b | 4683 | err = ext4_handle_dirty_metadata(handle, |
73b50c1c | 4684 | NULL, |
0390131b | 4685 | iloc.bh); |
ac27a0ec DK |
4686 | brelse(iloc.bh); |
4687 | } | |
4688 | } | |
617ba13b | 4689 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
4690 | return err; |
4691 | } | |
4692 | #endif | |
4693 | ||
617ba13b | 4694 | int ext4_change_inode_journal_flag(struct inode *inode, int val) |
ac27a0ec DK |
4695 | { |
4696 | journal_t *journal; | |
4697 | handle_t *handle; | |
4698 | int err; | |
4699 | ||
4700 | /* | |
4701 | * We have to be very careful here: changing a data block's | |
4702 | * journaling status dynamically is dangerous. If we write a | |
4703 | * data block to the journal, change the status and then delete | |
4704 | * that block, we risk forgetting to revoke the old log record | |
4705 | * from the journal and so a subsequent replay can corrupt data. | |
4706 | * So, first we make sure that the journal is empty and that | |
4707 | * nobody is changing anything. | |
4708 | */ | |
4709 | ||
617ba13b | 4710 | journal = EXT4_JOURNAL(inode); |
0390131b FM |
4711 | if (!journal) |
4712 | return 0; | |
d699594d | 4713 | if (is_journal_aborted(journal)) |
ac27a0ec | 4714 | return -EROFS; |
2aff57b0 YY |
4715 | /* We have to allocate physical blocks for delalloc blocks |
4716 | * before flushing journal. otherwise delalloc blocks can not | |
4717 | * be allocated any more. even more truncate on delalloc blocks | |
4718 | * could trigger BUG by flushing delalloc blocks in journal. | |
4719 | * There is no delalloc block in non-journal data mode. | |
4720 | */ | |
4721 | if (val && test_opt(inode->i_sb, DELALLOC)) { | |
4722 | err = ext4_alloc_da_blocks(inode); | |
4723 | if (err < 0) | |
4724 | return err; | |
4725 | } | |
ac27a0ec | 4726 | |
17335dcc DM |
4727 | /* Wait for all existing dio workers */ |
4728 | ext4_inode_block_unlocked_dio(inode); | |
4729 | inode_dio_wait(inode); | |
4730 | ||
dab291af | 4731 | jbd2_journal_lock_updates(journal); |
ac27a0ec DK |
4732 | |
4733 | /* | |
4734 | * OK, there are no updates running now, and all cached data is | |
4735 | * synced to disk. We are now in a completely consistent state | |
4736 | * which doesn't have anything in the journal, and we know that | |
4737 | * no filesystem updates are running, so it is safe to modify | |
4738 | * the inode's in-core data-journaling state flag now. | |
4739 | */ | |
4740 | ||
4741 | if (val) | |
12e9b892 | 4742 | ext4_set_inode_flag(inode, EXT4_INODE_JOURNAL_DATA); |
5872ddaa YY |
4743 | else { |
4744 | jbd2_journal_flush(journal); | |
12e9b892 | 4745 | ext4_clear_inode_flag(inode, EXT4_INODE_JOURNAL_DATA); |
5872ddaa | 4746 | } |
617ba13b | 4747 | ext4_set_aops(inode); |
ac27a0ec | 4748 | |
dab291af | 4749 | jbd2_journal_unlock_updates(journal); |
17335dcc | 4750 | ext4_inode_resume_unlocked_dio(inode); |
ac27a0ec DK |
4751 | |
4752 | /* Finally we can mark the inode as dirty. */ | |
4753 | ||
617ba13b | 4754 | handle = ext4_journal_start(inode, 1); |
ac27a0ec DK |
4755 | if (IS_ERR(handle)) |
4756 | return PTR_ERR(handle); | |
4757 | ||
617ba13b | 4758 | err = ext4_mark_inode_dirty(handle, inode); |
0390131b | 4759 | ext4_handle_sync(handle); |
617ba13b MC |
4760 | ext4_journal_stop(handle); |
4761 | ext4_std_error(inode->i_sb, err); | |
ac27a0ec DK |
4762 | |
4763 | return err; | |
4764 | } | |
2e9ee850 AK |
4765 | |
4766 | static int ext4_bh_unmapped(handle_t *handle, struct buffer_head *bh) | |
4767 | { | |
4768 | return !buffer_mapped(bh); | |
4769 | } | |
4770 | ||
c2ec175c | 4771 | int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
2e9ee850 | 4772 | { |
c2ec175c | 4773 | struct page *page = vmf->page; |
2e9ee850 AK |
4774 | loff_t size; |
4775 | unsigned long len; | |
9ea7df53 | 4776 | int ret; |
2e9ee850 AK |
4777 | struct file *file = vma->vm_file; |
4778 | struct inode *inode = file->f_path.dentry->d_inode; | |
4779 | struct address_space *mapping = inode->i_mapping; | |
9ea7df53 JK |
4780 | handle_t *handle; |
4781 | get_block_t *get_block; | |
4782 | int retries = 0; | |
2e9ee850 | 4783 | |
8e8ad8a5 | 4784 | sb_start_pagefault(inode->i_sb); |
041bbb6d | 4785 | file_update_time(vma->vm_file); |
9ea7df53 JK |
4786 | /* Delalloc case is easy... */ |
4787 | if (test_opt(inode->i_sb, DELALLOC) && | |
4788 | !ext4_should_journal_data(inode) && | |
4789 | !ext4_nonda_switch(inode->i_sb)) { | |
4790 | do { | |
4791 | ret = __block_page_mkwrite(vma, vmf, | |
4792 | ext4_da_get_block_prep); | |
4793 | } while (ret == -ENOSPC && | |
4794 | ext4_should_retry_alloc(inode->i_sb, &retries)); | |
4795 | goto out_ret; | |
2e9ee850 | 4796 | } |
0e499890 DW |
4797 | |
4798 | lock_page(page); | |
9ea7df53 JK |
4799 | size = i_size_read(inode); |
4800 | /* Page got truncated from under us? */ | |
4801 | if (page->mapping != mapping || page_offset(page) > size) { | |
4802 | unlock_page(page); | |
4803 | ret = VM_FAULT_NOPAGE; | |
4804 | goto out; | |
0e499890 | 4805 | } |
2e9ee850 AK |
4806 | |
4807 | if (page->index == size >> PAGE_CACHE_SHIFT) | |
4808 | len = size & ~PAGE_CACHE_MASK; | |
4809 | else | |
4810 | len = PAGE_CACHE_SIZE; | |
a827eaff | 4811 | /* |
9ea7df53 JK |
4812 | * Return if we have all the buffers mapped. This avoids the need to do |
4813 | * journal_start/journal_stop which can block and take a long time | |
a827eaff | 4814 | */ |
2e9ee850 | 4815 | if (page_has_buffers(page)) { |
f19d5870 TM |
4816 | if (!ext4_walk_page_buffers(NULL, page_buffers(page), |
4817 | 0, len, NULL, | |
4818 | ext4_bh_unmapped)) { | |
9ea7df53 JK |
4819 | /* Wait so that we don't change page under IO */ |
4820 | wait_on_page_writeback(page); | |
4821 | ret = VM_FAULT_LOCKED; | |
4822 | goto out; | |
a827eaff | 4823 | } |
2e9ee850 | 4824 | } |
a827eaff | 4825 | unlock_page(page); |
9ea7df53 JK |
4826 | /* OK, we need to fill the hole... */ |
4827 | if (ext4_should_dioread_nolock(inode)) | |
4828 | get_block = ext4_get_block_write; | |
4829 | else | |
4830 | get_block = ext4_get_block; | |
4831 | retry_alloc: | |
4832 | handle = ext4_journal_start(inode, ext4_writepage_trans_blocks(inode)); | |
4833 | if (IS_ERR(handle)) { | |
c2ec175c | 4834 | ret = VM_FAULT_SIGBUS; |
9ea7df53 JK |
4835 | goto out; |
4836 | } | |
4837 | ret = __block_page_mkwrite(vma, vmf, get_block); | |
4838 | if (!ret && ext4_should_journal_data(inode)) { | |
f19d5870 | 4839 | if (ext4_walk_page_buffers(handle, page_buffers(page), 0, |
9ea7df53 JK |
4840 | PAGE_CACHE_SIZE, NULL, do_journal_get_write_access)) { |
4841 | unlock_page(page); | |
4842 | ret = VM_FAULT_SIGBUS; | |
fcbb5515 | 4843 | ext4_journal_stop(handle); |
9ea7df53 JK |
4844 | goto out; |
4845 | } | |
4846 | ext4_set_inode_state(inode, EXT4_STATE_JDATA); | |
4847 | } | |
4848 | ext4_journal_stop(handle); | |
4849 | if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) | |
4850 | goto retry_alloc; | |
4851 | out_ret: | |
4852 | ret = block_page_mkwrite_return(ret); | |
4853 | out: | |
8e8ad8a5 | 4854 | sb_end_pagefault(inode->i_sb); |
2e9ee850 AK |
4855 | return ret; |
4856 | } |