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Commit | Line | Data |
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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 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/time.h> | |
dab291af | 24 | #include <linux/jbd2.h> |
ac27a0ec DK |
25 | #include <linux/highuid.h> |
26 | #include <linux/pagemap.h> | |
27 | #include <linux/quotaops.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/buffer_head.h> | |
30 | #include <linux/writeback.h> | |
64769240 | 31 | #include <linux/pagevec.h> |
ac27a0ec | 32 | #include <linux/mpage.h> |
e83c1397 | 33 | #include <linux/namei.h> |
ac27a0ec DK |
34 | #include <linux/uio.h> |
35 | #include <linux/bio.h> | |
4c0425ff | 36 | #include <linux/workqueue.h> |
744692dc | 37 | #include <linux/kernel.h> |
6db26ffc | 38 | #include <linux/printk.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
a8901d34 | 40 | #include <linux/ratelimit.h> |
9bffad1e | 41 | |
3dcf5451 | 42 | #include "ext4_jbd2.h" |
ac27a0ec DK |
43 | #include "xattr.h" |
44 | #include "acl.h" | |
d2a17637 | 45 | #include "ext4_extents.h" |
9f125d64 | 46 | #include "truncate.h" |
ac27a0ec | 47 | |
9bffad1e TT |
48 | #include <trace/events/ext4.h> |
49 | ||
a1d6cc56 AK |
50 | #define MPAGE_DA_EXTENT_TAIL 0x01 |
51 | ||
678aaf48 JK |
52 | static inline int ext4_begin_ordered_truncate(struct inode *inode, |
53 | loff_t new_size) | |
54 | { | |
7ff9c073 | 55 | trace_ext4_begin_ordered_truncate(inode, new_size); |
8aefcd55 TT |
56 | /* |
57 | * If jinode is zero, then we never opened the file for | |
58 | * writing, so there's no need to call | |
59 | * jbd2_journal_begin_ordered_truncate() since there's no | |
60 | * outstanding writes we need to flush. | |
61 | */ | |
62 | if (!EXT4_I(inode)->jinode) | |
63 | return 0; | |
64 | return jbd2_journal_begin_ordered_truncate(EXT4_JOURNAL(inode), | |
65 | EXT4_I(inode)->jinode, | |
66 | new_size); | |
678aaf48 JK |
67 | } |
68 | ||
64769240 | 69 | static void ext4_invalidatepage(struct page *page, unsigned long offset); |
cb20d518 TT |
70 | static int noalloc_get_block_write(struct inode *inode, sector_t iblock, |
71 | struct buffer_head *bh_result, int create); | |
72 | static int ext4_set_bh_endio(struct buffer_head *bh, struct inode *inode); | |
73 | static void ext4_end_io_buffer_write(struct buffer_head *bh, int uptodate); | |
74 | static int __ext4_journalled_writepage(struct page *page, unsigned int len); | |
75 | static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh); | |
64769240 | 76 | |
ac27a0ec DK |
77 | /* |
78 | * Test whether an inode is a fast symlink. | |
79 | */ | |
617ba13b | 80 | static int ext4_inode_is_fast_symlink(struct inode *inode) |
ac27a0ec | 81 | { |
617ba13b | 82 | int ea_blocks = EXT4_I(inode)->i_file_acl ? |
ac27a0ec DK |
83 | (inode->i_sb->s_blocksize >> 9) : 0; |
84 | ||
85 | return (S_ISLNK(inode->i_mode) && inode->i_blocks - ea_blocks == 0); | |
86 | } | |
87 | ||
ac27a0ec DK |
88 | /* |
89 | * Restart the transaction associated with *handle. This does a commit, | |
90 | * so before we call here everything must be consistently dirtied against | |
91 | * this transaction. | |
92 | */ | |
fa5d1113 | 93 | int ext4_truncate_restart_trans(handle_t *handle, struct inode *inode, |
487caeef | 94 | int nblocks) |
ac27a0ec | 95 | { |
487caeef JK |
96 | int ret; |
97 | ||
98 | /* | |
e35fd660 | 99 | * Drop i_data_sem to avoid deadlock with ext4_map_blocks. At this |
487caeef JK |
100 | * moment, get_block can be called only for blocks inside i_size since |
101 | * page cache has been already dropped and writes are blocked by | |
102 | * i_mutex. So we can safely drop the i_data_sem here. | |
103 | */ | |
0390131b | 104 | BUG_ON(EXT4_JOURNAL(inode) == NULL); |
ac27a0ec | 105 | jbd_debug(2, "restarting handle %p\n", handle); |
487caeef | 106 | up_write(&EXT4_I(inode)->i_data_sem); |
8e8eaabe | 107 | ret = ext4_journal_restart(handle, nblocks); |
487caeef | 108 | down_write(&EXT4_I(inode)->i_data_sem); |
fa5d1113 | 109 | ext4_discard_preallocations(inode); |
487caeef JK |
110 | |
111 | return ret; | |
ac27a0ec DK |
112 | } |
113 | ||
114 | /* | |
115 | * Called at the last iput() if i_nlink is zero. | |
116 | */ | |
0930fcc1 | 117 | void ext4_evict_inode(struct inode *inode) |
ac27a0ec DK |
118 | { |
119 | handle_t *handle; | |
bc965ab3 | 120 | int err; |
ac27a0ec | 121 | |
7ff9c073 | 122 | trace_ext4_evict_inode(inode); |
2581fdc8 | 123 | |
2581fdc8 JZ |
124 | ext4_ioend_wait(inode); |
125 | ||
0930fcc1 | 126 | if (inode->i_nlink) { |
2d859db3 JK |
127 | /* |
128 | * When journalling data dirty buffers are tracked only in the | |
129 | * journal. So although mm thinks everything is clean and | |
130 | * ready for reaping the inode might still have some pages to | |
131 | * write in the running transaction or waiting to be | |
132 | * checkpointed. Thus calling jbd2_journal_invalidatepage() | |
133 | * (via truncate_inode_pages()) to discard these buffers can | |
134 | * cause data loss. Also even if we did not discard these | |
135 | * buffers, we would have no way to find them after the inode | |
136 | * is reaped and thus user could see stale data if he tries to | |
137 | * read them before the transaction is checkpointed. So be | |
138 | * careful and force everything to disk here... We use | |
139 | * ei->i_datasync_tid to store the newest transaction | |
140 | * containing inode's data. | |
141 | * | |
142 | * Note that directories do not have this problem because they | |
143 | * don't use page cache. | |
144 | */ | |
145 | if (ext4_should_journal_data(inode) && | |
146 | (S_ISLNK(inode->i_mode) || S_ISREG(inode->i_mode))) { | |
147 | journal_t *journal = EXT4_SB(inode->i_sb)->s_journal; | |
148 | tid_t commit_tid = EXT4_I(inode)->i_datasync_tid; | |
149 | ||
150 | jbd2_log_start_commit(journal, commit_tid); | |
151 | jbd2_log_wait_commit(journal, commit_tid); | |
152 | filemap_write_and_wait(&inode->i_data); | |
153 | } | |
0930fcc1 AV |
154 | truncate_inode_pages(&inode->i_data, 0); |
155 | goto no_delete; | |
156 | } | |
157 | ||
907f4554 | 158 | if (!is_bad_inode(inode)) |
871a2931 | 159 | dquot_initialize(inode); |
907f4554 | 160 | |
678aaf48 JK |
161 | if (ext4_should_order_data(inode)) |
162 | ext4_begin_ordered_truncate(inode, 0); | |
ac27a0ec DK |
163 | truncate_inode_pages(&inode->i_data, 0); |
164 | ||
165 | if (is_bad_inode(inode)) | |
166 | goto no_delete; | |
167 | ||
9f125d64 | 168 | handle = ext4_journal_start(inode, ext4_blocks_for_truncate(inode)+3); |
ac27a0ec | 169 | if (IS_ERR(handle)) { |
bc965ab3 | 170 | ext4_std_error(inode->i_sb, PTR_ERR(handle)); |
ac27a0ec DK |
171 | /* |
172 | * If we're going to skip the normal cleanup, we still need to | |
173 | * make sure that the in-core orphan linked list is properly | |
174 | * cleaned up. | |
175 | */ | |
617ba13b | 176 | ext4_orphan_del(NULL, inode); |
ac27a0ec DK |
177 | goto no_delete; |
178 | } | |
179 | ||
180 | if (IS_SYNC(inode)) | |
0390131b | 181 | ext4_handle_sync(handle); |
ac27a0ec | 182 | inode->i_size = 0; |
bc965ab3 TT |
183 | err = ext4_mark_inode_dirty(handle, inode); |
184 | if (err) { | |
12062ddd | 185 | ext4_warning(inode->i_sb, |
bc965ab3 TT |
186 | "couldn't mark inode dirty (err %d)", err); |
187 | goto stop_handle; | |
188 | } | |
ac27a0ec | 189 | if (inode->i_blocks) |
617ba13b | 190 | ext4_truncate(inode); |
bc965ab3 TT |
191 | |
192 | /* | |
193 | * ext4_ext_truncate() doesn't reserve any slop when it | |
194 | * restarts journal transactions; therefore there may not be | |
195 | * enough credits left in the handle to remove the inode from | |
196 | * the orphan list and set the dtime field. | |
197 | */ | |
0390131b | 198 | if (!ext4_handle_has_enough_credits(handle, 3)) { |
bc965ab3 TT |
199 | err = ext4_journal_extend(handle, 3); |
200 | if (err > 0) | |
201 | err = ext4_journal_restart(handle, 3); | |
202 | if (err != 0) { | |
12062ddd | 203 | ext4_warning(inode->i_sb, |
bc965ab3 TT |
204 | "couldn't extend journal (err %d)", err); |
205 | stop_handle: | |
206 | ext4_journal_stop(handle); | |
45388219 | 207 | ext4_orphan_del(NULL, inode); |
bc965ab3 TT |
208 | goto no_delete; |
209 | } | |
210 | } | |
211 | ||
ac27a0ec | 212 | /* |
617ba13b | 213 | * Kill off the orphan record which ext4_truncate created. |
ac27a0ec | 214 | * AKPM: I think this can be inside the above `if'. |
617ba13b | 215 | * Note that ext4_orphan_del() has to be able to cope with the |
ac27a0ec | 216 | * deletion of a non-existent orphan - this is because we don't |
617ba13b | 217 | * know if ext4_truncate() actually created an orphan record. |
ac27a0ec DK |
218 | * (Well, we could do this if we need to, but heck - it works) |
219 | */ | |
617ba13b MC |
220 | ext4_orphan_del(handle, inode); |
221 | EXT4_I(inode)->i_dtime = get_seconds(); | |
ac27a0ec DK |
222 | |
223 | /* | |
224 | * One subtle ordering requirement: if anything has gone wrong | |
225 | * (transaction abort, IO errors, whatever), then we can still | |
226 | * do these next steps (the fs will already have been marked as | |
227 | * having errors), but we can't free the inode if the mark_dirty | |
228 | * fails. | |
229 | */ | |
617ba13b | 230 | if (ext4_mark_inode_dirty(handle, inode)) |
ac27a0ec | 231 | /* If that failed, just do the required in-core inode clear. */ |
0930fcc1 | 232 | ext4_clear_inode(inode); |
ac27a0ec | 233 | else |
617ba13b MC |
234 | ext4_free_inode(handle, inode); |
235 | ext4_journal_stop(handle); | |
ac27a0ec DK |
236 | return; |
237 | no_delete: | |
0930fcc1 | 238 | ext4_clear_inode(inode); /* We must guarantee clearing of inode... */ |
ac27a0ec DK |
239 | } |
240 | ||
a9e7f447 DM |
241 | #ifdef CONFIG_QUOTA |
242 | qsize_t *ext4_get_reserved_space(struct inode *inode) | |
60e58e0f | 243 | { |
a9e7f447 | 244 | return &EXT4_I(inode)->i_reserved_quota; |
60e58e0f | 245 | } |
a9e7f447 | 246 | #endif |
9d0be502 | 247 | |
12219aea AK |
248 | /* |
249 | * Calculate the number of metadata blocks need to reserve | |
9d0be502 | 250 | * to allocate a block located at @lblock |
12219aea | 251 | */ |
01f49d0b | 252 | static int ext4_calc_metadata_amount(struct inode *inode, ext4_lblk_t lblock) |
12219aea | 253 | { |
12e9b892 | 254 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
9d0be502 | 255 | return ext4_ext_calc_metadata_amount(inode, lblock); |
12219aea | 256 | |
8bb2b247 | 257 | return ext4_ind_calc_metadata_amount(inode, lblock); |
12219aea AK |
258 | } |
259 | ||
0637c6f4 TT |
260 | /* |
261 | * Called with i_data_sem down, which is important since we can call | |
262 | * ext4_discard_preallocations() from here. | |
263 | */ | |
5f634d06 AK |
264 | void ext4_da_update_reserve_space(struct inode *inode, |
265 | int used, int quota_claim) | |
12219aea AK |
266 | { |
267 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
0637c6f4 | 268 | struct ext4_inode_info *ei = EXT4_I(inode); |
0637c6f4 TT |
269 | |
270 | spin_lock(&ei->i_block_reservation_lock); | |
f8ec9d68 | 271 | trace_ext4_da_update_reserve_space(inode, used); |
0637c6f4 TT |
272 | if (unlikely(used > ei->i_reserved_data_blocks)) { |
273 | ext4_msg(inode->i_sb, KERN_NOTICE, "%s: ino %lu, used %d " | |
274 | "with only %d reserved data blocks\n", | |
275 | __func__, inode->i_ino, used, | |
276 | ei->i_reserved_data_blocks); | |
277 | WARN_ON(1); | |
278 | used = ei->i_reserved_data_blocks; | |
279 | } | |
12219aea | 280 | |
0637c6f4 TT |
281 | /* Update per-inode reservations */ |
282 | ei->i_reserved_data_blocks -= used; | |
0637c6f4 | 283 | ei->i_reserved_meta_blocks -= ei->i_allocated_meta_blocks; |
57042651 | 284 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, |
72b8ab9d | 285 | used + ei->i_allocated_meta_blocks); |
0637c6f4 | 286 | ei->i_allocated_meta_blocks = 0; |
6bc6e63f | 287 | |
0637c6f4 TT |
288 | if (ei->i_reserved_data_blocks == 0) { |
289 | /* | |
290 | * We can release all of the reserved metadata blocks | |
291 | * only when we have written all of the delayed | |
292 | * allocation blocks. | |
293 | */ | |
57042651 | 294 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, |
72b8ab9d | 295 | ei->i_reserved_meta_blocks); |
ee5f4d9c | 296 | ei->i_reserved_meta_blocks = 0; |
9d0be502 | 297 | ei->i_da_metadata_calc_len = 0; |
6bc6e63f | 298 | } |
12219aea | 299 | spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); |
60e58e0f | 300 | |
72b8ab9d ES |
301 | /* Update quota subsystem for data blocks */ |
302 | if (quota_claim) | |
5dd4056d | 303 | dquot_claim_block(inode, used); |
72b8ab9d | 304 | else { |
5f634d06 AK |
305 | /* |
306 | * We did fallocate with an offset that is already delayed | |
307 | * allocated. So on delayed allocated writeback we should | |
72b8ab9d | 308 | * not re-claim the quota for fallocated blocks. |
5f634d06 | 309 | */ |
72b8ab9d | 310 | dquot_release_reservation_block(inode, used); |
5f634d06 | 311 | } |
d6014301 AK |
312 | |
313 | /* | |
314 | * If we have done all the pending block allocations and if | |
315 | * there aren't any writers on the inode, we can discard the | |
316 | * inode's preallocations. | |
317 | */ | |
0637c6f4 TT |
318 | if ((ei->i_reserved_data_blocks == 0) && |
319 | (atomic_read(&inode->i_writecount) == 0)) | |
d6014301 | 320 | ext4_discard_preallocations(inode); |
12219aea AK |
321 | } |
322 | ||
e29136f8 | 323 | static int __check_block_validity(struct inode *inode, const char *func, |
c398eda0 TT |
324 | unsigned int line, |
325 | struct ext4_map_blocks *map) | |
6fd058f7 | 326 | { |
24676da4 TT |
327 | if (!ext4_data_block_valid(EXT4_SB(inode->i_sb), map->m_pblk, |
328 | map->m_len)) { | |
c398eda0 TT |
329 | ext4_error_inode(inode, func, line, map->m_pblk, |
330 | "lblock %lu mapped to illegal pblock " | |
331 | "(length %d)", (unsigned long) map->m_lblk, | |
332 | map->m_len); | |
6fd058f7 TT |
333 | return -EIO; |
334 | } | |
335 | return 0; | |
336 | } | |
337 | ||
e29136f8 | 338 | #define check_block_validity(inode, map) \ |
c398eda0 | 339 | __check_block_validity((inode), __func__, __LINE__, (map)) |
e29136f8 | 340 | |
55138e0b | 341 | /* |
1f94533d TT |
342 | * Return the number of contiguous dirty pages in a given inode |
343 | * starting at page frame idx. | |
55138e0b TT |
344 | */ |
345 | static pgoff_t ext4_num_dirty_pages(struct inode *inode, pgoff_t idx, | |
346 | unsigned int max_pages) | |
347 | { | |
348 | struct address_space *mapping = inode->i_mapping; | |
349 | pgoff_t index; | |
350 | struct pagevec pvec; | |
351 | pgoff_t num = 0; | |
352 | int i, nr_pages, done = 0; | |
353 | ||
354 | if (max_pages == 0) | |
355 | return 0; | |
356 | pagevec_init(&pvec, 0); | |
357 | while (!done) { | |
358 | index = idx; | |
359 | nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
360 | PAGECACHE_TAG_DIRTY, | |
361 | (pgoff_t)PAGEVEC_SIZE); | |
362 | if (nr_pages == 0) | |
363 | break; | |
364 | for (i = 0; i < nr_pages; i++) { | |
365 | struct page *page = pvec.pages[i]; | |
366 | struct buffer_head *bh, *head; | |
367 | ||
368 | lock_page(page); | |
369 | if (unlikely(page->mapping != mapping) || | |
370 | !PageDirty(page) || | |
371 | PageWriteback(page) || | |
372 | page->index != idx) { | |
373 | done = 1; | |
374 | unlock_page(page); | |
375 | break; | |
376 | } | |
1f94533d TT |
377 | if (page_has_buffers(page)) { |
378 | bh = head = page_buffers(page); | |
379 | do { | |
380 | if (!buffer_delay(bh) && | |
381 | !buffer_unwritten(bh)) | |
382 | done = 1; | |
383 | bh = bh->b_this_page; | |
384 | } while (!done && (bh != head)); | |
385 | } | |
55138e0b TT |
386 | unlock_page(page); |
387 | if (done) | |
388 | break; | |
389 | idx++; | |
390 | num++; | |
659c6009 ES |
391 | if (num >= max_pages) { |
392 | done = 1; | |
55138e0b | 393 | break; |
659c6009 | 394 | } |
55138e0b TT |
395 | } |
396 | pagevec_release(&pvec); | |
397 | } | |
398 | return num; | |
399 | } | |
400 | ||
f5ab0d1f | 401 | /* |
e35fd660 | 402 | * The ext4_map_blocks() function tries to look up the requested blocks, |
2b2d6d01 | 403 | * and returns if the blocks are already mapped. |
f5ab0d1f | 404 | * |
f5ab0d1f MC |
405 | * Otherwise it takes the write lock of the i_data_sem and allocate blocks |
406 | * and store the allocated blocks in the result buffer head and mark it | |
407 | * mapped. | |
408 | * | |
e35fd660 TT |
409 | * If file type is extents based, it will call ext4_ext_map_blocks(), |
410 | * Otherwise, call with ext4_ind_map_blocks() to handle indirect mapping | |
f5ab0d1f MC |
411 | * based files |
412 | * | |
413 | * On success, it returns the number of blocks being mapped or allocate. | |
414 | * if create==0 and the blocks are pre-allocated and uninitialized block, | |
415 | * the result buffer head is unmapped. If the create ==1, it will make sure | |
416 | * the buffer head is mapped. | |
417 | * | |
418 | * It returns 0 if plain look up failed (blocks have not been allocated), in | |
419 | * that casem, buffer head is unmapped | |
420 | * | |
421 | * It returns the error in case of allocation failure. | |
422 | */ | |
e35fd660 TT |
423 | int ext4_map_blocks(handle_t *handle, struct inode *inode, |
424 | struct ext4_map_blocks *map, int flags) | |
0e855ac8 AK |
425 | { |
426 | int retval; | |
f5ab0d1f | 427 | |
e35fd660 TT |
428 | map->m_flags = 0; |
429 | ext_debug("ext4_map_blocks(): inode %lu, flag %d, max_blocks %u," | |
430 | "logical block %lu\n", inode->i_ino, flags, map->m_len, | |
431 | (unsigned long) map->m_lblk); | |
4df3d265 | 432 | /* |
b920c755 TT |
433 | * Try to see if we can get the block without requesting a new |
434 | * file system block. | |
4df3d265 AK |
435 | */ |
436 | down_read((&EXT4_I(inode)->i_data_sem)); | |
12e9b892 | 437 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { |
e35fd660 | 438 | retval = ext4_ext_map_blocks(handle, inode, map, 0); |
0e855ac8 | 439 | } else { |
e35fd660 | 440 | retval = ext4_ind_map_blocks(handle, inode, map, 0); |
0e855ac8 | 441 | } |
4df3d265 | 442 | up_read((&EXT4_I(inode)->i_data_sem)); |
f5ab0d1f | 443 | |
e35fd660 | 444 | if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) { |
e29136f8 | 445 | int ret = check_block_validity(inode, map); |
6fd058f7 TT |
446 | if (ret != 0) |
447 | return ret; | |
448 | } | |
449 | ||
f5ab0d1f | 450 | /* If it is only a block(s) look up */ |
c2177057 | 451 | if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) |
f5ab0d1f MC |
452 | return retval; |
453 | ||
454 | /* | |
455 | * Returns if the blocks have already allocated | |
456 | * | |
457 | * Note that if blocks have been preallocated | |
458 | * ext4_ext_get_block() returns th create = 0 | |
459 | * with buffer head unmapped. | |
460 | */ | |
e35fd660 | 461 | if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) |
4df3d265 AK |
462 | return retval; |
463 | ||
2a8964d6 AK |
464 | /* |
465 | * When we call get_blocks without the create flag, the | |
466 | * BH_Unwritten flag could have gotten set if the blocks | |
467 | * requested were part of a uninitialized extent. We need to | |
468 | * clear this flag now that we are committed to convert all or | |
469 | * part of the uninitialized extent to be an initialized | |
470 | * extent. This is because we need to avoid the combination | |
471 | * of BH_Unwritten and BH_Mapped flags being simultaneously | |
472 | * set on the buffer_head. | |
473 | */ | |
e35fd660 | 474 | map->m_flags &= ~EXT4_MAP_UNWRITTEN; |
2a8964d6 | 475 | |
4df3d265 | 476 | /* |
f5ab0d1f MC |
477 | * New blocks allocate and/or writing to uninitialized extent |
478 | * will possibly result in updating i_data, so we take | |
479 | * the write lock of i_data_sem, and call get_blocks() | |
480 | * with create == 1 flag. | |
4df3d265 AK |
481 | */ |
482 | down_write((&EXT4_I(inode)->i_data_sem)); | |
d2a17637 MC |
483 | |
484 | /* | |
485 | * if the caller is from delayed allocation writeout path | |
486 | * we have already reserved fs blocks for allocation | |
487 | * let the underlying get_block() function know to | |
488 | * avoid double accounting | |
489 | */ | |
c2177057 | 490 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) |
f2321097 | 491 | ext4_set_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED); |
4df3d265 AK |
492 | /* |
493 | * We need to check for EXT4 here because migrate | |
494 | * could have changed the inode type in between | |
495 | */ | |
12e9b892 | 496 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { |
e35fd660 | 497 | retval = ext4_ext_map_blocks(handle, inode, map, flags); |
0e855ac8 | 498 | } else { |
e35fd660 | 499 | retval = ext4_ind_map_blocks(handle, inode, map, flags); |
267e4db9 | 500 | |
e35fd660 | 501 | if (retval > 0 && map->m_flags & EXT4_MAP_NEW) { |
267e4db9 AK |
502 | /* |
503 | * We allocated new blocks which will result in | |
504 | * i_data's format changing. Force the migrate | |
505 | * to fail by clearing migrate flags | |
506 | */ | |
19f5fb7a | 507 | ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE); |
267e4db9 | 508 | } |
d2a17637 | 509 | |
5f634d06 AK |
510 | /* |
511 | * Update reserved blocks/metadata blocks after successful | |
512 | * block allocation which had been deferred till now. We don't | |
513 | * support fallocate for non extent files. So we can update | |
514 | * reserve space here. | |
515 | */ | |
516 | if ((retval > 0) && | |
1296cc85 | 517 | (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)) |
5f634d06 AK |
518 | ext4_da_update_reserve_space(inode, retval, 1); |
519 | } | |
2ac3b6e0 | 520 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) |
f2321097 | 521 | ext4_clear_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED); |
2ac3b6e0 | 522 | |
4df3d265 | 523 | up_write((&EXT4_I(inode)->i_data_sem)); |
e35fd660 | 524 | if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) { |
e29136f8 | 525 | int ret = check_block_validity(inode, map); |
6fd058f7 TT |
526 | if (ret != 0) |
527 | return ret; | |
528 | } | |
0e855ac8 AK |
529 | return retval; |
530 | } | |
531 | ||
f3bd1f3f MC |
532 | /* Maximum number of blocks we map for direct IO at once. */ |
533 | #define DIO_MAX_BLOCKS 4096 | |
534 | ||
2ed88685 TT |
535 | static int _ext4_get_block(struct inode *inode, sector_t iblock, |
536 | struct buffer_head *bh, int flags) | |
ac27a0ec | 537 | { |
3e4fdaf8 | 538 | handle_t *handle = ext4_journal_current_handle(); |
2ed88685 | 539 | struct ext4_map_blocks map; |
7fb5409d | 540 | int ret = 0, started = 0; |
f3bd1f3f | 541 | int dio_credits; |
ac27a0ec | 542 | |
2ed88685 TT |
543 | map.m_lblk = iblock; |
544 | map.m_len = bh->b_size >> inode->i_blkbits; | |
545 | ||
546 | if (flags && !handle) { | |
7fb5409d | 547 | /* Direct IO write... */ |
2ed88685 TT |
548 | if (map.m_len > DIO_MAX_BLOCKS) |
549 | map.m_len = DIO_MAX_BLOCKS; | |
550 | dio_credits = ext4_chunk_trans_blocks(inode, map.m_len); | |
f3bd1f3f | 551 | handle = ext4_journal_start(inode, dio_credits); |
7fb5409d | 552 | if (IS_ERR(handle)) { |
ac27a0ec | 553 | ret = PTR_ERR(handle); |
2ed88685 | 554 | return ret; |
ac27a0ec | 555 | } |
7fb5409d | 556 | started = 1; |
ac27a0ec DK |
557 | } |
558 | ||
2ed88685 | 559 | ret = ext4_map_blocks(handle, inode, &map, flags); |
7fb5409d | 560 | if (ret > 0) { |
2ed88685 TT |
561 | map_bh(bh, inode->i_sb, map.m_pblk); |
562 | bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags; | |
563 | bh->b_size = inode->i_sb->s_blocksize * map.m_len; | |
7fb5409d | 564 | ret = 0; |
ac27a0ec | 565 | } |
7fb5409d JK |
566 | if (started) |
567 | ext4_journal_stop(handle); | |
ac27a0ec DK |
568 | return ret; |
569 | } | |
570 | ||
2ed88685 TT |
571 | int ext4_get_block(struct inode *inode, sector_t iblock, |
572 | struct buffer_head *bh, int create) | |
573 | { | |
574 | return _ext4_get_block(inode, iblock, bh, | |
575 | create ? EXT4_GET_BLOCKS_CREATE : 0); | |
576 | } | |
577 | ||
ac27a0ec DK |
578 | /* |
579 | * `handle' can be NULL if create is zero | |
580 | */ | |
617ba13b | 581 | struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode, |
725d26d3 | 582 | ext4_lblk_t block, int create, int *errp) |
ac27a0ec | 583 | { |
2ed88685 TT |
584 | struct ext4_map_blocks map; |
585 | struct buffer_head *bh; | |
ac27a0ec DK |
586 | int fatal = 0, err; |
587 | ||
588 | J_ASSERT(handle != NULL || create == 0); | |
589 | ||
2ed88685 TT |
590 | map.m_lblk = block; |
591 | map.m_len = 1; | |
592 | err = ext4_map_blocks(handle, inode, &map, | |
593 | create ? EXT4_GET_BLOCKS_CREATE : 0); | |
ac27a0ec | 594 | |
2ed88685 TT |
595 | if (err < 0) |
596 | *errp = err; | |
597 | if (err <= 0) | |
598 | return NULL; | |
599 | *errp = 0; | |
600 | ||
601 | bh = sb_getblk(inode->i_sb, map.m_pblk); | |
602 | if (!bh) { | |
603 | *errp = -EIO; | |
604 | return NULL; | |
ac27a0ec | 605 | } |
2ed88685 TT |
606 | if (map.m_flags & EXT4_MAP_NEW) { |
607 | J_ASSERT(create != 0); | |
608 | J_ASSERT(handle != NULL); | |
ac27a0ec | 609 | |
2ed88685 TT |
610 | /* |
611 | * Now that we do not always journal data, we should | |
612 | * keep in mind whether this should always journal the | |
613 | * new buffer as metadata. For now, regular file | |
614 | * writes use ext4_get_block instead, so it's not a | |
615 | * problem. | |
616 | */ | |
617 | lock_buffer(bh); | |
618 | BUFFER_TRACE(bh, "call get_create_access"); | |
619 | fatal = ext4_journal_get_create_access(handle, bh); | |
620 | if (!fatal && !buffer_uptodate(bh)) { | |
621 | memset(bh->b_data, 0, inode->i_sb->s_blocksize); | |
622 | set_buffer_uptodate(bh); | |
ac27a0ec | 623 | } |
2ed88685 TT |
624 | unlock_buffer(bh); |
625 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); | |
626 | err = ext4_handle_dirty_metadata(handle, inode, bh); | |
627 | if (!fatal) | |
628 | fatal = err; | |
629 | } else { | |
630 | BUFFER_TRACE(bh, "not a new buffer"); | |
ac27a0ec | 631 | } |
2ed88685 TT |
632 | if (fatal) { |
633 | *errp = fatal; | |
634 | brelse(bh); | |
635 | bh = NULL; | |
636 | } | |
637 | return bh; | |
ac27a0ec DK |
638 | } |
639 | ||
617ba13b | 640 | struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode, |
725d26d3 | 641 | ext4_lblk_t block, int create, int *err) |
ac27a0ec | 642 | { |
af5bc92d | 643 | struct buffer_head *bh; |
ac27a0ec | 644 | |
617ba13b | 645 | bh = ext4_getblk(handle, inode, block, create, err); |
ac27a0ec DK |
646 | if (!bh) |
647 | return bh; | |
648 | if (buffer_uptodate(bh)) | |
649 | return bh; | |
650 | ll_rw_block(READ_META, 1, &bh); | |
651 | wait_on_buffer(bh); | |
652 | if (buffer_uptodate(bh)) | |
653 | return bh; | |
654 | put_bh(bh); | |
655 | *err = -EIO; | |
656 | return NULL; | |
657 | } | |
658 | ||
af5bc92d TT |
659 | static int walk_page_buffers(handle_t *handle, |
660 | struct buffer_head *head, | |
661 | unsigned from, | |
662 | unsigned to, | |
663 | int *partial, | |
664 | int (*fn)(handle_t *handle, | |
665 | struct buffer_head *bh)) | |
ac27a0ec DK |
666 | { |
667 | struct buffer_head *bh; | |
668 | unsigned block_start, block_end; | |
669 | unsigned blocksize = head->b_size; | |
670 | int err, ret = 0; | |
671 | struct buffer_head *next; | |
672 | ||
af5bc92d TT |
673 | for (bh = head, block_start = 0; |
674 | ret == 0 && (bh != head || !block_start); | |
de9a55b8 | 675 | block_start = block_end, bh = next) { |
ac27a0ec DK |
676 | next = bh->b_this_page; |
677 | block_end = block_start + blocksize; | |
678 | if (block_end <= from || block_start >= to) { | |
679 | if (partial && !buffer_uptodate(bh)) | |
680 | *partial = 1; | |
681 | continue; | |
682 | } | |
683 | err = (*fn)(handle, bh); | |
684 | if (!ret) | |
685 | ret = err; | |
686 | } | |
687 | return ret; | |
688 | } | |
689 | ||
690 | /* | |
691 | * To preserve ordering, it is essential that the hole instantiation and | |
692 | * the data write be encapsulated in a single transaction. We cannot | |
617ba13b | 693 | * close off a transaction and start a new one between the ext4_get_block() |
dab291af | 694 | * and the commit_write(). So doing the jbd2_journal_start at the start of |
ac27a0ec DK |
695 | * prepare_write() is the right place. |
696 | * | |
617ba13b MC |
697 | * Also, this function can nest inside ext4_writepage() -> |
698 | * block_write_full_page(). In that case, we *know* that ext4_writepage() | |
ac27a0ec DK |
699 | * has generated enough buffer credits to do the whole page. So we won't |
700 | * block on the journal in that case, which is good, because the caller may | |
701 | * be PF_MEMALLOC. | |
702 | * | |
617ba13b | 703 | * By accident, ext4 can be reentered when a transaction is open via |
ac27a0ec DK |
704 | * quota file writes. If we were to commit the transaction while thus |
705 | * reentered, there can be a deadlock - we would be holding a quota | |
706 | * lock, and the commit would never complete if another thread had a | |
707 | * transaction open and was blocking on the quota lock - a ranking | |
708 | * violation. | |
709 | * | |
dab291af | 710 | * So what we do is to rely on the fact that jbd2_journal_stop/journal_start |
ac27a0ec DK |
711 | * will _not_ run commit under these circumstances because handle->h_ref |
712 | * is elevated. We'll still have enough credits for the tiny quotafile | |
713 | * write. | |
714 | */ | |
715 | static int do_journal_get_write_access(handle_t *handle, | |
de9a55b8 | 716 | struct buffer_head *bh) |
ac27a0ec | 717 | { |
56d35a4c JK |
718 | int dirty = buffer_dirty(bh); |
719 | int ret; | |
720 | ||
ac27a0ec DK |
721 | if (!buffer_mapped(bh) || buffer_freed(bh)) |
722 | return 0; | |
56d35a4c | 723 | /* |
ebdec241 | 724 | * __block_write_begin() could have dirtied some buffers. Clean |
56d35a4c JK |
725 | * the dirty bit as jbd2_journal_get_write_access() could complain |
726 | * otherwise about fs integrity issues. Setting of the dirty bit | |
ebdec241 | 727 | * by __block_write_begin() isn't a real problem here as we clear |
56d35a4c JK |
728 | * the bit before releasing a page lock and thus writeback cannot |
729 | * ever write the buffer. | |
730 | */ | |
731 | if (dirty) | |
732 | clear_buffer_dirty(bh); | |
733 | ret = ext4_journal_get_write_access(handle, bh); | |
734 | if (!ret && dirty) | |
735 | ret = ext4_handle_dirty_metadata(handle, NULL, bh); | |
736 | return ret; | |
ac27a0ec DK |
737 | } |
738 | ||
744692dc JZ |
739 | static int ext4_get_block_write(struct inode *inode, sector_t iblock, |
740 | struct buffer_head *bh_result, int create); | |
bfc1af65 | 741 | static int ext4_write_begin(struct file *file, struct address_space *mapping, |
de9a55b8 TT |
742 | loff_t pos, unsigned len, unsigned flags, |
743 | struct page **pagep, void **fsdata) | |
ac27a0ec | 744 | { |
af5bc92d | 745 | struct inode *inode = mapping->host; |
1938a150 | 746 | int ret, needed_blocks; |
ac27a0ec DK |
747 | handle_t *handle; |
748 | int retries = 0; | |
af5bc92d | 749 | struct page *page; |
de9a55b8 | 750 | pgoff_t index; |
af5bc92d | 751 | unsigned from, to; |
bfc1af65 | 752 | |
9bffad1e | 753 | trace_ext4_write_begin(inode, pos, len, flags); |
1938a150 AK |
754 | /* |
755 | * Reserve one block more for addition to orphan list in case | |
756 | * we allocate blocks but write fails for some reason | |
757 | */ | |
758 | needed_blocks = ext4_writepage_trans_blocks(inode) + 1; | |
de9a55b8 | 759 | index = pos >> PAGE_CACHE_SHIFT; |
af5bc92d TT |
760 | from = pos & (PAGE_CACHE_SIZE - 1); |
761 | to = from + len; | |
ac27a0ec DK |
762 | |
763 | retry: | |
af5bc92d TT |
764 | handle = ext4_journal_start(inode, needed_blocks); |
765 | if (IS_ERR(handle)) { | |
766 | ret = PTR_ERR(handle); | |
767 | goto out; | |
7479d2b9 | 768 | } |
ac27a0ec | 769 | |
ebd3610b JK |
770 | /* We cannot recurse into the filesystem as the transaction is already |
771 | * started */ | |
772 | flags |= AOP_FLAG_NOFS; | |
773 | ||
54566b2c | 774 | page = grab_cache_page_write_begin(mapping, index, flags); |
cf108bca JK |
775 | if (!page) { |
776 | ext4_journal_stop(handle); | |
777 | ret = -ENOMEM; | |
778 | goto out; | |
779 | } | |
780 | *pagep = page; | |
781 | ||
744692dc | 782 | if (ext4_should_dioread_nolock(inode)) |
6e1db88d | 783 | ret = __block_write_begin(page, pos, len, ext4_get_block_write); |
744692dc | 784 | else |
6e1db88d | 785 | ret = __block_write_begin(page, pos, len, ext4_get_block); |
bfc1af65 NP |
786 | |
787 | if (!ret && ext4_should_journal_data(inode)) { | |
ac27a0ec DK |
788 | ret = walk_page_buffers(handle, page_buffers(page), |
789 | from, to, NULL, do_journal_get_write_access); | |
790 | } | |
bfc1af65 NP |
791 | |
792 | if (ret) { | |
af5bc92d | 793 | unlock_page(page); |
af5bc92d | 794 | page_cache_release(page); |
ae4d5372 | 795 | /* |
6e1db88d | 796 | * __block_write_begin may have instantiated a few blocks |
ae4d5372 AK |
797 | * outside i_size. Trim these off again. Don't need |
798 | * i_size_read because we hold i_mutex. | |
1938a150 AK |
799 | * |
800 | * Add inode to orphan list in case we crash before | |
801 | * truncate finishes | |
ae4d5372 | 802 | */ |
ffacfa7a | 803 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
1938a150 AK |
804 | ext4_orphan_add(handle, inode); |
805 | ||
806 | ext4_journal_stop(handle); | |
807 | if (pos + len > inode->i_size) { | |
b9a4207d | 808 | ext4_truncate_failed_write(inode); |
de9a55b8 | 809 | /* |
ffacfa7a | 810 | * If truncate failed early the inode might |
1938a150 AK |
811 | * still be on the orphan list; we need to |
812 | * make sure the inode is removed from the | |
813 | * orphan list in that case. | |
814 | */ | |
815 | if (inode->i_nlink) | |
816 | ext4_orphan_del(NULL, inode); | |
817 | } | |
bfc1af65 NP |
818 | } |
819 | ||
617ba13b | 820 | if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) |
ac27a0ec | 821 | goto retry; |
7479d2b9 | 822 | out: |
ac27a0ec DK |
823 | return ret; |
824 | } | |
825 | ||
bfc1af65 NP |
826 | /* For write_end() in data=journal mode */ |
827 | static int write_end_fn(handle_t *handle, struct buffer_head *bh) | |
ac27a0ec DK |
828 | { |
829 | if (!buffer_mapped(bh) || buffer_freed(bh)) | |
830 | return 0; | |
831 | set_buffer_uptodate(bh); | |
0390131b | 832 | return ext4_handle_dirty_metadata(handle, NULL, bh); |
ac27a0ec DK |
833 | } |
834 | ||
f8514083 | 835 | static int ext4_generic_write_end(struct file *file, |
de9a55b8 TT |
836 | struct address_space *mapping, |
837 | loff_t pos, unsigned len, unsigned copied, | |
838 | struct page *page, void *fsdata) | |
f8514083 AK |
839 | { |
840 | int i_size_changed = 0; | |
841 | struct inode *inode = mapping->host; | |
842 | handle_t *handle = ext4_journal_current_handle(); | |
843 | ||
844 | copied = block_write_end(file, mapping, pos, len, copied, page, fsdata); | |
845 | ||
846 | /* | |
847 | * No need to use i_size_read() here, the i_size | |
848 | * cannot change under us because we hold i_mutex. | |
849 | * | |
850 | * But it's important to update i_size while still holding page lock: | |
851 | * page writeout could otherwise come in and zero beyond i_size. | |
852 | */ | |
853 | if (pos + copied > inode->i_size) { | |
854 | i_size_write(inode, pos + copied); | |
855 | i_size_changed = 1; | |
856 | } | |
857 | ||
858 | if (pos + copied > EXT4_I(inode)->i_disksize) { | |
859 | /* We need to mark inode dirty even if | |
860 | * new_i_size is less that inode->i_size | |
861 | * bu greater than i_disksize.(hint delalloc) | |
862 | */ | |
863 | ext4_update_i_disksize(inode, (pos + copied)); | |
864 | i_size_changed = 1; | |
865 | } | |
866 | unlock_page(page); | |
867 | page_cache_release(page); | |
868 | ||
869 | /* | |
870 | * Don't mark the inode dirty under page lock. First, it unnecessarily | |
871 | * makes the holding time of page lock longer. Second, it forces lock | |
872 | * ordering of page lock and transaction start for journaling | |
873 | * filesystems. | |
874 | */ | |
875 | if (i_size_changed) | |
876 | ext4_mark_inode_dirty(handle, inode); | |
877 | ||
878 | return copied; | |
879 | } | |
880 | ||
ac27a0ec DK |
881 | /* |
882 | * We need to pick up the new inode size which generic_commit_write gave us | |
883 | * `file' can be NULL - eg, when called from page_symlink(). | |
884 | * | |
617ba13b | 885 | * ext4 never places buffers on inode->i_mapping->private_list. metadata |
ac27a0ec DK |
886 | * buffers are managed internally. |
887 | */ | |
bfc1af65 | 888 | static int ext4_ordered_write_end(struct file *file, |
de9a55b8 TT |
889 | struct address_space *mapping, |
890 | loff_t pos, unsigned len, unsigned copied, | |
891 | struct page *page, void *fsdata) | |
ac27a0ec | 892 | { |
617ba13b | 893 | handle_t *handle = ext4_journal_current_handle(); |
cf108bca | 894 | struct inode *inode = mapping->host; |
ac27a0ec DK |
895 | int ret = 0, ret2; |
896 | ||
9bffad1e | 897 | trace_ext4_ordered_write_end(inode, pos, len, copied); |
678aaf48 | 898 | ret = ext4_jbd2_file_inode(handle, inode); |
ac27a0ec DK |
899 | |
900 | if (ret == 0) { | |
f8514083 | 901 | ret2 = ext4_generic_write_end(file, mapping, pos, len, copied, |
bfc1af65 | 902 | page, fsdata); |
f8a87d89 | 903 | copied = ret2; |
ffacfa7a | 904 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
f8514083 AK |
905 | /* if we have allocated more blocks and copied |
906 | * less. We will have blocks allocated outside | |
907 | * inode->i_size. So truncate them | |
908 | */ | |
909 | ext4_orphan_add(handle, inode); | |
f8a87d89 RK |
910 | if (ret2 < 0) |
911 | ret = ret2; | |
ac27a0ec | 912 | } |
617ba13b | 913 | ret2 = ext4_journal_stop(handle); |
ac27a0ec DK |
914 | if (!ret) |
915 | ret = ret2; | |
bfc1af65 | 916 | |
f8514083 | 917 | if (pos + len > inode->i_size) { |
b9a4207d | 918 | ext4_truncate_failed_write(inode); |
de9a55b8 | 919 | /* |
ffacfa7a | 920 | * If truncate failed early the inode might still be |
f8514083 AK |
921 | * on the orphan list; we need to make sure the inode |
922 | * is removed from the orphan list in that case. | |
923 | */ | |
924 | if (inode->i_nlink) | |
925 | ext4_orphan_del(NULL, inode); | |
926 | } | |
927 | ||
928 | ||
bfc1af65 | 929 | return ret ? ret : copied; |
ac27a0ec DK |
930 | } |
931 | ||
bfc1af65 | 932 | static int ext4_writeback_write_end(struct file *file, |
de9a55b8 TT |
933 | struct address_space *mapping, |
934 | loff_t pos, unsigned len, unsigned copied, | |
935 | struct page *page, void *fsdata) | |
ac27a0ec | 936 | { |
617ba13b | 937 | handle_t *handle = ext4_journal_current_handle(); |
cf108bca | 938 | struct inode *inode = mapping->host; |
ac27a0ec | 939 | int ret = 0, ret2; |
ac27a0ec | 940 | |
9bffad1e | 941 | trace_ext4_writeback_write_end(inode, pos, len, copied); |
f8514083 | 942 | ret2 = ext4_generic_write_end(file, mapping, pos, len, copied, |
bfc1af65 | 943 | page, fsdata); |
f8a87d89 | 944 | copied = ret2; |
ffacfa7a | 945 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
f8514083 AK |
946 | /* if we have allocated more blocks and copied |
947 | * less. We will have blocks allocated outside | |
948 | * inode->i_size. So truncate them | |
949 | */ | |
950 | ext4_orphan_add(handle, inode); | |
951 | ||
f8a87d89 RK |
952 | if (ret2 < 0) |
953 | ret = ret2; | |
ac27a0ec | 954 | |
617ba13b | 955 | ret2 = ext4_journal_stop(handle); |
ac27a0ec DK |
956 | if (!ret) |
957 | ret = ret2; | |
bfc1af65 | 958 | |
f8514083 | 959 | if (pos + len > inode->i_size) { |
b9a4207d | 960 | ext4_truncate_failed_write(inode); |
de9a55b8 | 961 | /* |
ffacfa7a | 962 | * If truncate failed early the inode might still be |
f8514083 AK |
963 | * on the orphan list; we need to make sure the inode |
964 | * is removed from the orphan list in that case. | |
965 | */ | |
966 | if (inode->i_nlink) | |
967 | ext4_orphan_del(NULL, inode); | |
968 | } | |
969 | ||
bfc1af65 | 970 | return ret ? ret : copied; |
ac27a0ec DK |
971 | } |
972 | ||
bfc1af65 | 973 | static int ext4_journalled_write_end(struct file *file, |
de9a55b8 TT |
974 | struct address_space *mapping, |
975 | loff_t pos, unsigned len, unsigned copied, | |
976 | struct page *page, void *fsdata) | |
ac27a0ec | 977 | { |
617ba13b | 978 | handle_t *handle = ext4_journal_current_handle(); |
bfc1af65 | 979 | struct inode *inode = mapping->host; |
ac27a0ec DK |
980 | int ret = 0, ret2; |
981 | int partial = 0; | |
bfc1af65 | 982 | unsigned from, to; |
cf17fea6 | 983 | loff_t new_i_size; |
ac27a0ec | 984 | |
9bffad1e | 985 | trace_ext4_journalled_write_end(inode, pos, len, copied); |
bfc1af65 NP |
986 | from = pos & (PAGE_CACHE_SIZE - 1); |
987 | to = from + len; | |
988 | ||
441c8508 CW |
989 | BUG_ON(!ext4_handle_valid(handle)); |
990 | ||
bfc1af65 NP |
991 | if (copied < len) { |
992 | if (!PageUptodate(page)) | |
993 | copied = 0; | |
994 | page_zero_new_buffers(page, from+copied, to); | |
995 | } | |
ac27a0ec DK |
996 | |
997 | ret = walk_page_buffers(handle, page_buffers(page), from, | |
bfc1af65 | 998 | to, &partial, write_end_fn); |
ac27a0ec DK |
999 | if (!partial) |
1000 | SetPageUptodate(page); | |
cf17fea6 AK |
1001 | new_i_size = pos + copied; |
1002 | if (new_i_size > inode->i_size) | |
bfc1af65 | 1003 | i_size_write(inode, pos+copied); |
19f5fb7a | 1004 | ext4_set_inode_state(inode, EXT4_STATE_JDATA); |
2d859db3 | 1005 | EXT4_I(inode)->i_datasync_tid = handle->h_transaction->t_tid; |
cf17fea6 AK |
1006 | if (new_i_size > EXT4_I(inode)->i_disksize) { |
1007 | ext4_update_i_disksize(inode, new_i_size); | |
617ba13b | 1008 | ret2 = ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
1009 | if (!ret) |
1010 | ret = ret2; | |
1011 | } | |
bfc1af65 | 1012 | |
cf108bca | 1013 | unlock_page(page); |
f8514083 | 1014 | page_cache_release(page); |
ffacfa7a | 1015 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
f8514083 AK |
1016 | /* if we have allocated more blocks and copied |
1017 | * less. We will have blocks allocated outside | |
1018 | * inode->i_size. So truncate them | |
1019 | */ | |
1020 | ext4_orphan_add(handle, inode); | |
1021 | ||
617ba13b | 1022 | ret2 = ext4_journal_stop(handle); |
ac27a0ec DK |
1023 | if (!ret) |
1024 | ret = ret2; | |
f8514083 | 1025 | if (pos + len > inode->i_size) { |
b9a4207d | 1026 | ext4_truncate_failed_write(inode); |
de9a55b8 | 1027 | /* |
ffacfa7a | 1028 | * If truncate failed early the inode might still be |
f8514083 AK |
1029 | * on the orphan list; we need to make sure the inode |
1030 | * is removed from the orphan list in that case. | |
1031 | */ | |
1032 | if (inode->i_nlink) | |
1033 | ext4_orphan_del(NULL, inode); | |
1034 | } | |
bfc1af65 NP |
1035 | |
1036 | return ret ? ret : copied; | |
ac27a0ec | 1037 | } |
d2a17637 | 1038 | |
9d0be502 TT |
1039 | /* |
1040 | * Reserve a single block located at lblock | |
1041 | */ | |
01f49d0b | 1042 | static int ext4_da_reserve_space(struct inode *inode, ext4_lblk_t lblock) |
d2a17637 | 1043 | { |
030ba6bc | 1044 | int retries = 0; |
60e58e0f | 1045 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
0637c6f4 | 1046 | struct ext4_inode_info *ei = EXT4_I(inode); |
72b8ab9d | 1047 | unsigned long md_needed; |
5dd4056d | 1048 | int ret; |
d2a17637 MC |
1049 | |
1050 | /* | |
1051 | * recalculate the amount of metadata blocks to reserve | |
1052 | * in order to allocate nrblocks | |
1053 | * worse case is one extent per block | |
1054 | */ | |
030ba6bc | 1055 | repeat: |
0637c6f4 | 1056 | spin_lock(&ei->i_block_reservation_lock); |
9d0be502 | 1057 | md_needed = ext4_calc_metadata_amount(inode, lblock); |
f8ec9d68 | 1058 | trace_ext4_da_reserve_space(inode, md_needed); |
0637c6f4 | 1059 | spin_unlock(&ei->i_block_reservation_lock); |
d2a17637 | 1060 | |
60e58e0f | 1061 | /* |
72b8ab9d ES |
1062 | * We will charge metadata quota at writeout time; this saves |
1063 | * us from metadata over-estimation, though we may go over by | |
1064 | * a small amount in the end. Here we just reserve for data. | |
60e58e0f | 1065 | */ |
72b8ab9d | 1066 | ret = dquot_reserve_block(inode, 1); |
5dd4056d CH |
1067 | if (ret) |
1068 | return ret; | |
72b8ab9d ES |
1069 | /* |
1070 | * We do still charge estimated metadata to the sb though; | |
1071 | * we cannot afford to run out of free blocks. | |
1072 | */ | |
55f020db | 1073 | if (ext4_claim_free_blocks(sbi, md_needed + 1, 0)) { |
72b8ab9d | 1074 | dquot_release_reservation_block(inode, 1); |
030ba6bc AK |
1075 | if (ext4_should_retry_alloc(inode->i_sb, &retries)) { |
1076 | yield(); | |
1077 | goto repeat; | |
1078 | } | |
d2a17637 MC |
1079 | return -ENOSPC; |
1080 | } | |
0637c6f4 | 1081 | spin_lock(&ei->i_block_reservation_lock); |
9d0be502 | 1082 | ei->i_reserved_data_blocks++; |
0637c6f4 TT |
1083 | ei->i_reserved_meta_blocks += md_needed; |
1084 | spin_unlock(&ei->i_block_reservation_lock); | |
39bc680a | 1085 | |
d2a17637 MC |
1086 | return 0; /* success */ |
1087 | } | |
1088 | ||
12219aea | 1089 | static void ext4_da_release_space(struct inode *inode, int to_free) |
d2a17637 MC |
1090 | { |
1091 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
0637c6f4 | 1092 | struct ext4_inode_info *ei = EXT4_I(inode); |
d2a17637 | 1093 | |
cd213226 MC |
1094 | if (!to_free) |
1095 | return; /* Nothing to release, exit */ | |
1096 | ||
d2a17637 | 1097 | spin_lock(&EXT4_I(inode)->i_block_reservation_lock); |
cd213226 | 1098 | |
5a58ec87 | 1099 | trace_ext4_da_release_space(inode, to_free); |
0637c6f4 | 1100 | if (unlikely(to_free > ei->i_reserved_data_blocks)) { |
cd213226 | 1101 | /* |
0637c6f4 TT |
1102 | * if there aren't enough reserved blocks, then the |
1103 | * counter is messed up somewhere. Since this | |
1104 | * function is called from invalidate page, it's | |
1105 | * harmless to return without any action. | |
cd213226 | 1106 | */ |
0637c6f4 TT |
1107 | ext4_msg(inode->i_sb, KERN_NOTICE, "ext4_da_release_space: " |
1108 | "ino %lu, to_free %d with only %d reserved " | |
1109 | "data blocks\n", inode->i_ino, to_free, | |
1110 | ei->i_reserved_data_blocks); | |
1111 | WARN_ON(1); | |
1112 | to_free = ei->i_reserved_data_blocks; | |
cd213226 | 1113 | } |
0637c6f4 | 1114 | ei->i_reserved_data_blocks -= to_free; |
cd213226 | 1115 | |
0637c6f4 TT |
1116 | if (ei->i_reserved_data_blocks == 0) { |
1117 | /* | |
1118 | * We can release all of the reserved metadata blocks | |
1119 | * only when we have written all of the delayed | |
1120 | * allocation blocks. | |
1121 | */ | |
57042651 | 1122 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, |
72b8ab9d | 1123 | ei->i_reserved_meta_blocks); |
ee5f4d9c | 1124 | ei->i_reserved_meta_blocks = 0; |
9d0be502 | 1125 | ei->i_da_metadata_calc_len = 0; |
0637c6f4 | 1126 | } |
d2a17637 | 1127 | |
72b8ab9d | 1128 | /* update fs dirty data blocks counter */ |
57042651 | 1129 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, to_free); |
d2a17637 | 1130 | |
d2a17637 | 1131 | spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); |
60e58e0f | 1132 | |
5dd4056d | 1133 | dquot_release_reservation_block(inode, to_free); |
d2a17637 MC |
1134 | } |
1135 | ||
1136 | static void ext4_da_page_release_reservation(struct page *page, | |
de9a55b8 | 1137 | unsigned long offset) |
d2a17637 MC |
1138 | { |
1139 | int to_release = 0; | |
1140 | struct buffer_head *head, *bh; | |
1141 | unsigned int curr_off = 0; | |
1142 | ||
1143 | head = page_buffers(page); | |
1144 | bh = head; | |
1145 | do { | |
1146 | unsigned int next_off = curr_off + bh->b_size; | |
1147 | ||
1148 | if ((offset <= curr_off) && (buffer_delay(bh))) { | |
1149 | to_release++; | |
1150 | clear_buffer_delay(bh); | |
1151 | } | |
1152 | curr_off = next_off; | |
1153 | } while ((bh = bh->b_this_page) != head); | |
12219aea | 1154 | ext4_da_release_space(page->mapping->host, to_release); |
d2a17637 | 1155 | } |
ac27a0ec | 1156 | |
64769240 AT |
1157 | /* |
1158 | * Delayed allocation stuff | |
1159 | */ | |
1160 | ||
64769240 AT |
1161 | /* |
1162 | * mpage_da_submit_io - walks through extent of pages and try to write | |
a1d6cc56 | 1163 | * them with writepage() call back |
64769240 AT |
1164 | * |
1165 | * @mpd->inode: inode | |
1166 | * @mpd->first_page: first page of the extent | |
1167 | * @mpd->next_page: page after the last page of the extent | |
64769240 AT |
1168 | * |
1169 | * By the time mpage_da_submit_io() is called we expect all blocks | |
1170 | * to be allocated. this may be wrong if allocation failed. | |
1171 | * | |
1172 | * As pages are already locked by write_cache_pages(), we can't use it | |
1173 | */ | |
1de3e3df TT |
1174 | static int mpage_da_submit_io(struct mpage_da_data *mpd, |
1175 | struct ext4_map_blocks *map) | |
64769240 | 1176 | { |
791b7f08 AK |
1177 | struct pagevec pvec; |
1178 | unsigned long index, end; | |
1179 | int ret = 0, err, nr_pages, i; | |
1180 | struct inode *inode = mpd->inode; | |
1181 | struct address_space *mapping = inode->i_mapping; | |
cb20d518 | 1182 | loff_t size = i_size_read(inode); |
3ecdb3a1 TT |
1183 | unsigned int len, block_start; |
1184 | struct buffer_head *bh, *page_bufs = NULL; | |
cb20d518 | 1185 | int journal_data = ext4_should_journal_data(inode); |
1de3e3df | 1186 | sector_t pblock = 0, cur_logical = 0; |
bd2d0210 | 1187 | struct ext4_io_submit io_submit; |
64769240 AT |
1188 | |
1189 | BUG_ON(mpd->next_page <= mpd->first_page); | |
bd2d0210 | 1190 | memset(&io_submit, 0, sizeof(io_submit)); |
791b7f08 AK |
1191 | /* |
1192 | * We need to start from the first_page to the next_page - 1 | |
1193 | * to make sure we also write the mapped dirty buffer_heads. | |
8dc207c0 | 1194 | * If we look at mpd->b_blocknr we would only be looking |
791b7f08 AK |
1195 | * at the currently mapped buffer_heads. |
1196 | */ | |
64769240 AT |
1197 | index = mpd->first_page; |
1198 | end = mpd->next_page - 1; | |
1199 | ||
791b7f08 | 1200 | pagevec_init(&pvec, 0); |
64769240 | 1201 | while (index <= end) { |
791b7f08 | 1202 | nr_pages = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE); |
64769240 AT |
1203 | if (nr_pages == 0) |
1204 | break; | |
1205 | for (i = 0; i < nr_pages; i++) { | |
97498956 | 1206 | int commit_write = 0, skip_page = 0; |
64769240 AT |
1207 | struct page *page = pvec.pages[i]; |
1208 | ||
791b7f08 AK |
1209 | index = page->index; |
1210 | if (index > end) | |
1211 | break; | |
cb20d518 TT |
1212 | |
1213 | if (index == size >> PAGE_CACHE_SHIFT) | |
1214 | len = size & ~PAGE_CACHE_MASK; | |
1215 | else | |
1216 | len = PAGE_CACHE_SIZE; | |
1de3e3df TT |
1217 | if (map) { |
1218 | cur_logical = index << (PAGE_CACHE_SHIFT - | |
1219 | inode->i_blkbits); | |
1220 | pblock = map->m_pblk + (cur_logical - | |
1221 | map->m_lblk); | |
1222 | } | |
791b7f08 AK |
1223 | index++; |
1224 | ||
1225 | BUG_ON(!PageLocked(page)); | |
1226 | BUG_ON(PageWriteback(page)); | |
1227 | ||
64769240 | 1228 | /* |
cb20d518 TT |
1229 | * If the page does not have buffers (for |
1230 | * whatever reason), try to create them using | |
a107e5a3 | 1231 | * __block_write_begin. If this fails, |
97498956 | 1232 | * skip the page and move on. |
64769240 | 1233 | */ |
cb20d518 | 1234 | if (!page_has_buffers(page)) { |
a107e5a3 | 1235 | if (__block_write_begin(page, 0, len, |
cb20d518 | 1236 | noalloc_get_block_write)) { |
97498956 | 1237 | skip_page: |
cb20d518 TT |
1238 | unlock_page(page); |
1239 | continue; | |
1240 | } | |
1241 | commit_write = 1; | |
1242 | } | |
64769240 | 1243 | |
3ecdb3a1 TT |
1244 | bh = page_bufs = page_buffers(page); |
1245 | block_start = 0; | |
64769240 | 1246 | do { |
1de3e3df | 1247 | if (!bh) |
97498956 | 1248 | goto skip_page; |
1de3e3df TT |
1249 | if (map && (cur_logical >= map->m_lblk) && |
1250 | (cur_logical <= (map->m_lblk + | |
1251 | (map->m_len - 1)))) { | |
29fa89d0 AK |
1252 | if (buffer_delay(bh)) { |
1253 | clear_buffer_delay(bh); | |
1254 | bh->b_blocknr = pblock; | |
29fa89d0 | 1255 | } |
1de3e3df TT |
1256 | if (buffer_unwritten(bh) || |
1257 | buffer_mapped(bh)) | |
1258 | BUG_ON(bh->b_blocknr != pblock); | |
1259 | if (map->m_flags & EXT4_MAP_UNINIT) | |
1260 | set_buffer_uninit(bh); | |
1261 | clear_buffer_unwritten(bh); | |
1262 | } | |
29fa89d0 | 1263 | |
97498956 | 1264 | /* skip page if block allocation undone */ |
1de3e3df | 1265 | if (buffer_delay(bh) || buffer_unwritten(bh)) |
97498956 | 1266 | skip_page = 1; |
3ecdb3a1 TT |
1267 | bh = bh->b_this_page; |
1268 | block_start += bh->b_size; | |
64769240 AT |
1269 | cur_logical++; |
1270 | pblock++; | |
1de3e3df TT |
1271 | } while (bh != page_bufs); |
1272 | ||
97498956 TT |
1273 | if (skip_page) |
1274 | goto skip_page; | |
cb20d518 TT |
1275 | |
1276 | if (commit_write) | |
1277 | /* mark the buffer_heads as dirty & uptodate */ | |
1278 | block_commit_write(page, 0, len); | |
1279 | ||
97498956 | 1280 | clear_page_dirty_for_io(page); |
bd2d0210 TT |
1281 | /* |
1282 | * Delalloc doesn't support data journalling, | |
1283 | * but eventually maybe we'll lift this | |
1284 | * restriction. | |
1285 | */ | |
1286 | if (unlikely(journal_data && PageChecked(page))) | |
cb20d518 | 1287 | err = __ext4_journalled_writepage(page, len); |
1449032b | 1288 | else if (test_opt(inode->i_sb, MBLK_IO_SUBMIT)) |
bd2d0210 TT |
1289 | err = ext4_bio_write_page(&io_submit, page, |
1290 | len, mpd->wbc); | |
9dd75f1f TT |
1291 | else if (buffer_uninit(page_bufs)) { |
1292 | ext4_set_bh_endio(page_bufs, inode); | |
1293 | err = block_write_full_page_endio(page, | |
1294 | noalloc_get_block_write, | |
1295 | mpd->wbc, ext4_end_io_buffer_write); | |
1296 | } else | |
1449032b TT |
1297 | err = block_write_full_page(page, |
1298 | noalloc_get_block_write, mpd->wbc); | |
cb20d518 TT |
1299 | |
1300 | if (!err) | |
a1d6cc56 | 1301 | mpd->pages_written++; |
64769240 AT |
1302 | /* |
1303 | * In error case, we have to continue because | |
1304 | * remaining pages are still locked | |
64769240 AT |
1305 | */ |
1306 | if (ret == 0) | |
1307 | ret = err; | |
64769240 AT |
1308 | } |
1309 | pagevec_release(&pvec); | |
1310 | } | |
bd2d0210 | 1311 | ext4_io_submit(&io_submit); |
64769240 | 1312 | return ret; |
64769240 AT |
1313 | } |
1314 | ||
c7f5938a | 1315 | static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd) |
c4a0c46e AK |
1316 | { |
1317 | int nr_pages, i; | |
1318 | pgoff_t index, end; | |
1319 | struct pagevec pvec; | |
1320 | struct inode *inode = mpd->inode; | |
1321 | struct address_space *mapping = inode->i_mapping; | |
1322 | ||
c7f5938a CW |
1323 | index = mpd->first_page; |
1324 | end = mpd->next_page - 1; | |
c4a0c46e AK |
1325 | while (index <= end) { |
1326 | nr_pages = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE); | |
1327 | if (nr_pages == 0) | |
1328 | break; | |
1329 | for (i = 0; i < nr_pages; i++) { | |
1330 | struct page *page = pvec.pages[i]; | |
9b1d0998 | 1331 | if (page->index > end) |
c4a0c46e | 1332 | break; |
c4a0c46e AK |
1333 | BUG_ON(!PageLocked(page)); |
1334 | BUG_ON(PageWriteback(page)); | |
1335 | block_invalidatepage(page, 0); | |
1336 | ClearPageUptodate(page); | |
1337 | unlock_page(page); | |
1338 | } | |
9b1d0998 JK |
1339 | index = pvec.pages[nr_pages - 1]->index + 1; |
1340 | pagevec_release(&pvec); | |
c4a0c46e AK |
1341 | } |
1342 | return; | |
1343 | } | |
1344 | ||
df22291f AK |
1345 | static void ext4_print_free_blocks(struct inode *inode) |
1346 | { | |
1347 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
1693918e TT |
1348 | printk(KERN_CRIT "Total free blocks count %lld\n", |
1349 | ext4_count_free_blocks(inode->i_sb)); | |
1350 | printk(KERN_CRIT "Free/Dirty block details\n"); | |
1351 | printk(KERN_CRIT "free_blocks=%lld\n", | |
57042651 TT |
1352 | (long long) EXT4_C2B(EXT4_SB(inode->i_sb), |
1353 | percpu_counter_sum(&sbi->s_freeclusters_counter))); | |
1693918e | 1354 | printk(KERN_CRIT "dirty_blocks=%lld\n", |
57042651 | 1355 | (long long) percpu_counter_sum(&sbi->s_dirtyclusters_counter)); |
1693918e TT |
1356 | printk(KERN_CRIT "Block reservation details\n"); |
1357 | printk(KERN_CRIT "i_reserved_data_blocks=%u\n", | |
1358 | EXT4_I(inode)->i_reserved_data_blocks); | |
1359 | printk(KERN_CRIT "i_reserved_meta_blocks=%u\n", | |
1360 | EXT4_I(inode)->i_reserved_meta_blocks); | |
df22291f AK |
1361 | return; |
1362 | } | |
1363 | ||
64769240 | 1364 | /* |
5a87b7a5 TT |
1365 | * mpage_da_map_and_submit - go through given space, map them |
1366 | * if necessary, and then submit them for I/O | |
64769240 | 1367 | * |
8dc207c0 | 1368 | * @mpd - bh describing space |
64769240 AT |
1369 | * |
1370 | * The function skips space we know is already mapped to disk blocks. | |
1371 | * | |
64769240 | 1372 | */ |
5a87b7a5 | 1373 | static void mpage_da_map_and_submit(struct mpage_da_data *mpd) |
64769240 | 1374 | { |
2ac3b6e0 | 1375 | int err, blks, get_blocks_flags; |
1de3e3df | 1376 | struct ext4_map_blocks map, *mapp = NULL; |
2fa3cdfb TT |
1377 | sector_t next = mpd->b_blocknr; |
1378 | unsigned max_blocks = mpd->b_size >> mpd->inode->i_blkbits; | |
1379 | loff_t disksize = EXT4_I(mpd->inode)->i_disksize; | |
1380 | handle_t *handle = NULL; | |
64769240 AT |
1381 | |
1382 | /* | |
5a87b7a5 TT |
1383 | * If the blocks are mapped already, or we couldn't accumulate |
1384 | * any blocks, then proceed immediately to the submission stage. | |
2fa3cdfb | 1385 | */ |
5a87b7a5 TT |
1386 | if ((mpd->b_size == 0) || |
1387 | ((mpd->b_state & (1 << BH_Mapped)) && | |
1388 | !(mpd->b_state & (1 << BH_Delay)) && | |
1389 | !(mpd->b_state & (1 << BH_Unwritten)))) | |
1390 | goto submit_io; | |
2fa3cdfb TT |
1391 | |
1392 | handle = ext4_journal_current_handle(); | |
1393 | BUG_ON(!handle); | |
1394 | ||
79ffab34 | 1395 | /* |
79e83036 | 1396 | * Call ext4_map_blocks() to allocate any delayed allocation |
2ac3b6e0 TT |
1397 | * blocks, or to convert an uninitialized extent to be |
1398 | * initialized (in the case where we have written into | |
1399 | * one or more preallocated blocks). | |
1400 | * | |
1401 | * We pass in the magic EXT4_GET_BLOCKS_DELALLOC_RESERVE to | |
1402 | * indicate that we are on the delayed allocation path. This | |
1403 | * affects functions in many different parts of the allocation | |
1404 | * call path. This flag exists primarily because we don't | |
79e83036 | 1405 | * want to change *many* call functions, so ext4_map_blocks() |
f2321097 | 1406 | * will set the EXT4_STATE_DELALLOC_RESERVED flag once the |
2ac3b6e0 TT |
1407 | * inode's allocation semaphore is taken. |
1408 | * | |
1409 | * If the blocks in questions were delalloc blocks, set | |
1410 | * EXT4_GET_BLOCKS_DELALLOC_RESERVE so the delalloc accounting | |
1411 | * variables are updated after the blocks have been allocated. | |
79ffab34 | 1412 | */ |
2ed88685 TT |
1413 | map.m_lblk = next; |
1414 | map.m_len = max_blocks; | |
1296cc85 | 1415 | get_blocks_flags = EXT4_GET_BLOCKS_CREATE; |
744692dc JZ |
1416 | if (ext4_should_dioread_nolock(mpd->inode)) |
1417 | get_blocks_flags |= EXT4_GET_BLOCKS_IO_CREATE_EXT; | |
2ac3b6e0 | 1418 | if (mpd->b_state & (1 << BH_Delay)) |
1296cc85 AK |
1419 | get_blocks_flags |= EXT4_GET_BLOCKS_DELALLOC_RESERVE; |
1420 | ||
2ed88685 | 1421 | blks = ext4_map_blocks(handle, mpd->inode, &map, get_blocks_flags); |
2fa3cdfb | 1422 | if (blks < 0) { |
e3570639 ES |
1423 | struct super_block *sb = mpd->inode->i_sb; |
1424 | ||
2fa3cdfb | 1425 | err = blks; |
ed5bde0b | 1426 | /* |
5a87b7a5 | 1427 | * If get block returns EAGAIN or ENOSPC and there |
97498956 TT |
1428 | * appears to be free blocks we will just let |
1429 | * mpage_da_submit_io() unlock all of the pages. | |
c4a0c46e AK |
1430 | */ |
1431 | if (err == -EAGAIN) | |
5a87b7a5 | 1432 | goto submit_io; |
df22291f AK |
1433 | |
1434 | if (err == -ENOSPC && | |
e3570639 | 1435 | ext4_count_free_blocks(sb)) { |
df22291f | 1436 | mpd->retval = err; |
5a87b7a5 | 1437 | goto submit_io; |
df22291f AK |
1438 | } |
1439 | ||
c4a0c46e | 1440 | /* |
ed5bde0b TT |
1441 | * get block failure will cause us to loop in |
1442 | * writepages, because a_ops->writepage won't be able | |
1443 | * to make progress. The page will be redirtied by | |
1444 | * writepage and writepages will again try to write | |
1445 | * the same. | |
c4a0c46e | 1446 | */ |
e3570639 ES |
1447 | if (!(EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED)) { |
1448 | ext4_msg(sb, KERN_CRIT, | |
1449 | "delayed block allocation failed for inode %lu " | |
1450 | "at logical offset %llu with max blocks %zd " | |
1451 | "with error %d", mpd->inode->i_ino, | |
1452 | (unsigned long long) next, | |
1453 | mpd->b_size >> mpd->inode->i_blkbits, err); | |
1454 | ext4_msg(sb, KERN_CRIT, | |
1455 | "This should not happen!! Data will be lost\n"); | |
1456 | if (err == -ENOSPC) | |
1457 | ext4_print_free_blocks(mpd->inode); | |
030ba6bc | 1458 | } |
2fa3cdfb | 1459 | /* invalidate all the pages */ |
c7f5938a | 1460 | ext4_da_block_invalidatepages(mpd); |
e0fd9b90 CW |
1461 | |
1462 | /* Mark this page range as having been completed */ | |
1463 | mpd->io_done = 1; | |
5a87b7a5 | 1464 | return; |
c4a0c46e | 1465 | } |
2fa3cdfb TT |
1466 | BUG_ON(blks == 0); |
1467 | ||
1de3e3df | 1468 | mapp = ↦ |
2ed88685 TT |
1469 | if (map.m_flags & EXT4_MAP_NEW) { |
1470 | struct block_device *bdev = mpd->inode->i_sb->s_bdev; | |
1471 | int i; | |
64769240 | 1472 | |
2ed88685 TT |
1473 | for (i = 0; i < map.m_len; i++) |
1474 | unmap_underlying_metadata(bdev, map.m_pblk + i); | |
64769240 | 1475 | |
decbd919 TT |
1476 | if (ext4_should_order_data(mpd->inode)) { |
1477 | err = ext4_jbd2_file_inode(handle, mpd->inode); | |
1478 | if (err) | |
1479 | /* Only if the journal is aborted */ | |
1480 | return; | |
1481 | } | |
2fa3cdfb TT |
1482 | } |
1483 | ||
1484 | /* | |
03f5d8bc | 1485 | * Update on-disk size along with block allocation. |
2fa3cdfb TT |
1486 | */ |
1487 | disksize = ((loff_t) next + blks) << mpd->inode->i_blkbits; | |
1488 | if (disksize > i_size_read(mpd->inode)) | |
1489 | disksize = i_size_read(mpd->inode); | |
1490 | if (disksize > EXT4_I(mpd->inode)->i_disksize) { | |
1491 | ext4_update_i_disksize(mpd->inode, disksize); | |
5a87b7a5 TT |
1492 | err = ext4_mark_inode_dirty(handle, mpd->inode); |
1493 | if (err) | |
1494 | ext4_error(mpd->inode->i_sb, | |
1495 | "Failed to mark inode %lu dirty", | |
1496 | mpd->inode->i_ino); | |
2fa3cdfb TT |
1497 | } |
1498 | ||
5a87b7a5 | 1499 | submit_io: |
1de3e3df | 1500 | mpage_da_submit_io(mpd, mapp); |
5a87b7a5 | 1501 | mpd->io_done = 1; |
64769240 AT |
1502 | } |
1503 | ||
bf068ee2 AK |
1504 | #define BH_FLAGS ((1 << BH_Uptodate) | (1 << BH_Mapped) | \ |
1505 | (1 << BH_Delay) | (1 << BH_Unwritten)) | |
64769240 AT |
1506 | |
1507 | /* | |
1508 | * mpage_add_bh_to_extent - try to add one more block to extent of blocks | |
1509 | * | |
1510 | * @mpd->lbh - extent of blocks | |
1511 | * @logical - logical number of the block in the file | |
1512 | * @bh - bh of the block (used to access block's state) | |
1513 | * | |
1514 | * the function is used to collect contig. blocks in same state | |
1515 | */ | |
1516 | static void mpage_add_bh_to_extent(struct mpage_da_data *mpd, | |
8dc207c0 TT |
1517 | sector_t logical, size_t b_size, |
1518 | unsigned long b_state) | |
64769240 | 1519 | { |
64769240 | 1520 | sector_t next; |
8dc207c0 | 1521 | int nrblocks = mpd->b_size >> mpd->inode->i_blkbits; |
64769240 | 1522 | |
c445e3e0 ES |
1523 | /* |
1524 | * XXX Don't go larger than mballoc is willing to allocate | |
1525 | * This is a stopgap solution. We eventually need to fold | |
1526 | * mpage_da_submit_io() into this function and then call | |
79e83036 | 1527 | * ext4_map_blocks() multiple times in a loop |
c445e3e0 ES |
1528 | */ |
1529 | if (nrblocks >= 8*1024*1024/mpd->inode->i_sb->s_blocksize) | |
1530 | goto flush_it; | |
1531 | ||
525f4ed8 | 1532 | /* check if thereserved journal credits might overflow */ |
12e9b892 | 1533 | if (!(ext4_test_inode_flag(mpd->inode, EXT4_INODE_EXTENTS))) { |
525f4ed8 MC |
1534 | if (nrblocks >= EXT4_MAX_TRANS_DATA) { |
1535 | /* | |
1536 | * With non-extent format we are limited by the journal | |
1537 | * credit available. Total credit needed to insert | |
1538 | * nrblocks contiguous blocks is dependent on the | |
1539 | * nrblocks. So limit nrblocks. | |
1540 | */ | |
1541 | goto flush_it; | |
1542 | } else if ((nrblocks + (b_size >> mpd->inode->i_blkbits)) > | |
1543 | EXT4_MAX_TRANS_DATA) { | |
1544 | /* | |
1545 | * Adding the new buffer_head would make it cross the | |
1546 | * allowed limit for which we have journal credit | |
1547 | * reserved. So limit the new bh->b_size | |
1548 | */ | |
1549 | b_size = (EXT4_MAX_TRANS_DATA - nrblocks) << | |
1550 | mpd->inode->i_blkbits; | |
1551 | /* we will do mpage_da_submit_io in the next loop */ | |
1552 | } | |
1553 | } | |
64769240 AT |
1554 | /* |
1555 | * First block in the extent | |
1556 | */ | |
8dc207c0 TT |
1557 | if (mpd->b_size == 0) { |
1558 | mpd->b_blocknr = logical; | |
1559 | mpd->b_size = b_size; | |
1560 | mpd->b_state = b_state & BH_FLAGS; | |
64769240 AT |
1561 | return; |
1562 | } | |
1563 | ||
8dc207c0 | 1564 | next = mpd->b_blocknr + nrblocks; |
64769240 AT |
1565 | /* |
1566 | * Can we merge the block to our big extent? | |
1567 | */ | |
8dc207c0 TT |
1568 | if (logical == next && (b_state & BH_FLAGS) == mpd->b_state) { |
1569 | mpd->b_size += b_size; | |
64769240 AT |
1570 | return; |
1571 | } | |
1572 | ||
525f4ed8 | 1573 | flush_it: |
64769240 AT |
1574 | /* |
1575 | * We couldn't merge the block to our extent, so we | |
1576 | * need to flush current extent and start new one | |
1577 | */ | |
5a87b7a5 | 1578 | mpage_da_map_and_submit(mpd); |
a1d6cc56 | 1579 | return; |
64769240 AT |
1580 | } |
1581 | ||
c364b22c | 1582 | static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh) |
29fa89d0 | 1583 | { |
c364b22c | 1584 | return (buffer_delay(bh) || buffer_unwritten(bh)) && buffer_dirty(bh); |
29fa89d0 AK |
1585 | } |
1586 | ||
64769240 | 1587 | /* |
b920c755 TT |
1588 | * This is a special get_blocks_t callback which is used by |
1589 | * ext4_da_write_begin(). It will either return mapped block or | |
1590 | * reserve space for a single block. | |
29fa89d0 AK |
1591 | * |
1592 | * For delayed buffer_head we have BH_Mapped, BH_New, BH_Delay set. | |
1593 | * We also have b_blocknr = -1 and b_bdev initialized properly | |
1594 | * | |
1595 | * For unwritten buffer_head we have BH_Mapped, BH_New, BH_Unwritten set. | |
1596 | * We also have b_blocknr = physicalblock mapping unwritten extent and b_bdev | |
1597 | * initialized properly. | |
64769240 AT |
1598 | */ |
1599 | static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, | |
2ed88685 | 1600 | struct buffer_head *bh, int create) |
64769240 | 1601 | { |
2ed88685 | 1602 | struct ext4_map_blocks map; |
64769240 | 1603 | int ret = 0; |
33b9817e AK |
1604 | sector_t invalid_block = ~((sector_t) 0xffff); |
1605 | ||
1606 | if (invalid_block < ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es)) | |
1607 | invalid_block = ~0; | |
64769240 AT |
1608 | |
1609 | BUG_ON(create == 0); | |
2ed88685 TT |
1610 | BUG_ON(bh->b_size != inode->i_sb->s_blocksize); |
1611 | ||
1612 | map.m_lblk = iblock; | |
1613 | map.m_len = 1; | |
64769240 AT |
1614 | |
1615 | /* | |
1616 | * first, we need to know whether the block is allocated already | |
1617 | * preallocated blocks are unmapped but should treated | |
1618 | * the same as allocated blocks. | |
1619 | */ | |
2ed88685 TT |
1620 | ret = ext4_map_blocks(NULL, inode, &map, 0); |
1621 | if (ret < 0) | |
1622 | return ret; | |
1623 | if (ret == 0) { | |
1624 | if (buffer_delay(bh)) | |
1625 | return 0; /* Not sure this could or should happen */ | |
64769240 | 1626 | /* |
ebdec241 | 1627 | * XXX: __block_write_begin() unmaps passed block, is it OK? |
64769240 | 1628 | */ |
9d0be502 | 1629 | ret = ext4_da_reserve_space(inode, iblock); |
d2a17637 MC |
1630 | if (ret) |
1631 | /* not enough space to reserve */ | |
1632 | return ret; | |
1633 | ||
2ed88685 TT |
1634 | map_bh(bh, inode->i_sb, invalid_block); |
1635 | set_buffer_new(bh); | |
1636 | set_buffer_delay(bh); | |
1637 | return 0; | |
64769240 AT |
1638 | } |
1639 | ||
2ed88685 TT |
1640 | map_bh(bh, inode->i_sb, map.m_pblk); |
1641 | bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags; | |
1642 | ||
1643 | if (buffer_unwritten(bh)) { | |
1644 | /* A delayed write to unwritten bh should be marked | |
1645 | * new and mapped. Mapped ensures that we don't do | |
1646 | * get_block multiple times when we write to the same | |
1647 | * offset and new ensures that we do proper zero out | |
1648 | * for partial write. | |
1649 | */ | |
1650 | set_buffer_new(bh); | |
c8205636 | 1651 | set_buffer_mapped(bh); |
2ed88685 TT |
1652 | } |
1653 | return 0; | |
64769240 | 1654 | } |
61628a3f | 1655 | |
b920c755 TT |
1656 | /* |
1657 | * This function is used as a standard get_block_t calback function | |
1658 | * when there is no desire to allocate any blocks. It is used as a | |
ebdec241 | 1659 | * callback function for block_write_begin() and block_write_full_page(). |
206f7ab4 | 1660 | * These functions should only try to map a single block at a time. |
b920c755 TT |
1661 | * |
1662 | * Since this function doesn't do block allocations even if the caller | |
1663 | * requests it by passing in create=1, it is critically important that | |
1664 | * any caller checks to make sure that any buffer heads are returned | |
1665 | * by this function are either all already mapped or marked for | |
206f7ab4 CH |
1666 | * delayed allocation before calling block_write_full_page(). Otherwise, |
1667 | * b_blocknr could be left unitialized, and the page write functions will | |
1668 | * be taken by surprise. | |
b920c755 TT |
1669 | */ |
1670 | static int noalloc_get_block_write(struct inode *inode, sector_t iblock, | |
f0e6c985 AK |
1671 | struct buffer_head *bh_result, int create) |
1672 | { | |
a2dc52b5 | 1673 | BUG_ON(bh_result->b_size != inode->i_sb->s_blocksize); |
2ed88685 | 1674 | return _ext4_get_block(inode, iblock, bh_result, 0); |
61628a3f MC |
1675 | } |
1676 | ||
62e086be AK |
1677 | static int bget_one(handle_t *handle, struct buffer_head *bh) |
1678 | { | |
1679 | get_bh(bh); | |
1680 | return 0; | |
1681 | } | |
1682 | ||
1683 | static int bput_one(handle_t *handle, struct buffer_head *bh) | |
1684 | { | |
1685 | put_bh(bh); | |
1686 | return 0; | |
1687 | } | |
1688 | ||
1689 | static int __ext4_journalled_writepage(struct page *page, | |
62e086be AK |
1690 | unsigned int len) |
1691 | { | |
1692 | struct address_space *mapping = page->mapping; | |
1693 | struct inode *inode = mapping->host; | |
1694 | struct buffer_head *page_bufs; | |
1695 | handle_t *handle = NULL; | |
1696 | int ret = 0; | |
1697 | int err; | |
1698 | ||
cb20d518 | 1699 | ClearPageChecked(page); |
62e086be AK |
1700 | page_bufs = page_buffers(page); |
1701 | BUG_ON(!page_bufs); | |
1702 | walk_page_buffers(handle, page_bufs, 0, len, NULL, bget_one); | |
1703 | /* As soon as we unlock the page, it can go away, but we have | |
1704 | * references to buffers so we are safe */ | |
1705 | unlock_page(page); | |
1706 | ||
1707 | handle = ext4_journal_start(inode, ext4_writepage_trans_blocks(inode)); | |
1708 | if (IS_ERR(handle)) { | |
1709 | ret = PTR_ERR(handle); | |
1710 | goto out; | |
1711 | } | |
1712 | ||
441c8508 CW |
1713 | BUG_ON(!ext4_handle_valid(handle)); |
1714 | ||
62e086be AK |
1715 | ret = walk_page_buffers(handle, page_bufs, 0, len, NULL, |
1716 | do_journal_get_write_access); | |
1717 | ||
1718 | err = walk_page_buffers(handle, page_bufs, 0, len, NULL, | |
1719 | write_end_fn); | |
1720 | if (ret == 0) | |
1721 | ret = err; | |
2d859db3 | 1722 | EXT4_I(inode)->i_datasync_tid = handle->h_transaction->t_tid; |
62e086be AK |
1723 | err = ext4_journal_stop(handle); |
1724 | if (!ret) | |
1725 | ret = err; | |
1726 | ||
1727 | walk_page_buffers(handle, page_bufs, 0, len, NULL, bput_one); | |
19f5fb7a | 1728 | ext4_set_inode_state(inode, EXT4_STATE_JDATA); |
62e086be AK |
1729 | out: |
1730 | return ret; | |
1731 | } | |
1732 | ||
744692dc JZ |
1733 | static int ext4_set_bh_endio(struct buffer_head *bh, struct inode *inode); |
1734 | static void ext4_end_io_buffer_write(struct buffer_head *bh, int uptodate); | |
1735 | ||
61628a3f | 1736 | /* |
43ce1d23 AK |
1737 | * Note that we don't need to start a transaction unless we're journaling data |
1738 | * because we should have holes filled from ext4_page_mkwrite(). We even don't | |
1739 | * need to file the inode to the transaction's list in ordered mode because if | |
1740 | * we are writing back data added by write(), the inode is already there and if | |
25985edc | 1741 | * we are writing back data modified via mmap(), no one guarantees in which |
43ce1d23 AK |
1742 | * transaction the data will hit the disk. In case we are journaling data, we |
1743 | * cannot start transaction directly because transaction start ranks above page | |
1744 | * lock so we have to do some magic. | |
1745 | * | |
b920c755 TT |
1746 | * This function can get called via... |
1747 | * - ext4_da_writepages after taking page lock (have journal handle) | |
1748 | * - journal_submit_inode_data_buffers (no journal handle) | |
1749 | * - shrink_page_list via pdflush (no journal handle) | |
1750 | * - grab_page_cache when doing write_begin (have journal handle) | |
43ce1d23 AK |
1751 | * |
1752 | * We don't do any block allocation in this function. If we have page with | |
1753 | * multiple blocks we need to write those buffer_heads that are mapped. This | |
1754 | * is important for mmaped based write. So if we do with blocksize 1K | |
1755 | * truncate(f, 1024); | |
1756 | * a = mmap(f, 0, 4096); | |
1757 | * a[0] = 'a'; | |
1758 | * truncate(f, 4096); | |
1759 | * we have in the page first buffer_head mapped via page_mkwrite call back | |
1760 | * but other bufer_heads would be unmapped but dirty(dirty done via the | |
1761 | * do_wp_page). So writepage should write the first block. If we modify | |
1762 | * the mmap area beyond 1024 we will again get a page_fault and the | |
1763 | * page_mkwrite callback will do the block allocation and mark the | |
1764 | * buffer_heads mapped. | |
1765 | * | |
1766 | * We redirty the page if we have any buffer_heads that is either delay or | |
1767 | * unwritten in the page. | |
1768 | * | |
1769 | * We can get recursively called as show below. | |
1770 | * | |
1771 | * ext4_writepage() -> kmalloc() -> __alloc_pages() -> page_launder() -> | |
1772 | * ext4_writepage() | |
1773 | * | |
1774 | * But since we don't do any block allocation we should not deadlock. | |
1775 | * Page also have the dirty flag cleared so we don't get recurive page_lock. | |
61628a3f | 1776 | */ |
43ce1d23 | 1777 | static int ext4_writepage(struct page *page, |
62e086be | 1778 | struct writeback_control *wbc) |
64769240 | 1779 | { |
a42afc5f | 1780 | int ret = 0, commit_write = 0; |
61628a3f | 1781 | loff_t size; |
498e5f24 | 1782 | unsigned int len; |
744692dc | 1783 | struct buffer_head *page_bufs = NULL; |
61628a3f MC |
1784 | struct inode *inode = page->mapping->host; |
1785 | ||
a9c667f8 | 1786 | trace_ext4_writepage(page); |
f0e6c985 AK |
1787 | size = i_size_read(inode); |
1788 | if (page->index == size >> PAGE_CACHE_SHIFT) | |
1789 | len = size & ~PAGE_CACHE_MASK; | |
1790 | else | |
1791 | len = PAGE_CACHE_SIZE; | |
64769240 | 1792 | |
a42afc5f TT |
1793 | /* |
1794 | * If the page does not have buffers (for whatever reason), | |
a107e5a3 | 1795 | * try to create them using __block_write_begin. If this |
a42afc5f TT |
1796 | * fails, redirty the page and move on. |
1797 | */ | |
b1142e8f | 1798 | if (!page_has_buffers(page)) { |
a107e5a3 | 1799 | if (__block_write_begin(page, 0, len, |
a42afc5f TT |
1800 | noalloc_get_block_write)) { |
1801 | redirty_page: | |
f0e6c985 AK |
1802 | redirty_page_for_writepage(wbc, page); |
1803 | unlock_page(page); | |
1804 | return 0; | |
1805 | } | |
a42afc5f TT |
1806 | commit_write = 1; |
1807 | } | |
1808 | page_bufs = page_buffers(page); | |
1809 | if (walk_page_buffers(NULL, page_bufs, 0, len, NULL, | |
1810 | ext4_bh_delay_or_unwritten)) { | |
f0e6c985 | 1811 | /* |
b1142e8f TT |
1812 | * We don't want to do block allocation, so redirty |
1813 | * the page and return. We may reach here when we do | |
1814 | * a journal commit via journal_submit_inode_data_buffers. | |
1815 | * We can also reach here via shrink_page_list | |
f0e6c985 | 1816 | */ |
a42afc5f TT |
1817 | goto redirty_page; |
1818 | } | |
1819 | if (commit_write) | |
ed9b3e33 | 1820 | /* now mark the buffer_heads as dirty and uptodate */ |
b767e78a | 1821 | block_commit_write(page, 0, len); |
64769240 | 1822 | |
cb20d518 | 1823 | if (PageChecked(page) && ext4_should_journal_data(inode)) |
43ce1d23 AK |
1824 | /* |
1825 | * It's mmapped pagecache. Add buffers and journal it. There | |
1826 | * doesn't seem much point in redirtying the page here. | |
1827 | */ | |
3f0ca309 | 1828 | return __ext4_journalled_writepage(page, len); |
43ce1d23 | 1829 | |
a42afc5f | 1830 | if (buffer_uninit(page_bufs)) { |
744692dc JZ |
1831 | ext4_set_bh_endio(page_bufs, inode); |
1832 | ret = block_write_full_page_endio(page, noalloc_get_block_write, | |
1833 | wbc, ext4_end_io_buffer_write); | |
1834 | } else | |
b920c755 TT |
1835 | ret = block_write_full_page(page, noalloc_get_block_write, |
1836 | wbc); | |
64769240 | 1837 | |
64769240 AT |
1838 | return ret; |
1839 | } | |
1840 | ||
61628a3f | 1841 | /* |
525f4ed8 | 1842 | * This is called via ext4_da_writepages() to |
25985edc | 1843 | * calculate the total number of credits to reserve to fit |
525f4ed8 MC |
1844 | * a single extent allocation into a single transaction, |
1845 | * ext4_da_writpeages() will loop calling this before | |
1846 | * the block allocation. | |
61628a3f | 1847 | */ |
525f4ed8 MC |
1848 | |
1849 | static int ext4_da_writepages_trans_blocks(struct inode *inode) | |
1850 | { | |
1851 | int max_blocks = EXT4_I(inode)->i_reserved_data_blocks; | |
1852 | ||
1853 | /* | |
1854 | * With non-extent format the journal credit needed to | |
1855 | * insert nrblocks contiguous block is dependent on | |
1856 | * number of contiguous block. So we will limit | |
1857 | * number of contiguous block to a sane value | |
1858 | */ | |
12e9b892 | 1859 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) && |
525f4ed8 MC |
1860 | (max_blocks > EXT4_MAX_TRANS_DATA)) |
1861 | max_blocks = EXT4_MAX_TRANS_DATA; | |
1862 | ||
1863 | return ext4_chunk_trans_blocks(inode, max_blocks); | |
1864 | } | |
61628a3f | 1865 | |
8e48dcfb TT |
1866 | /* |
1867 | * write_cache_pages_da - walk the list of dirty pages of the given | |
8eb9e5ce | 1868 | * address space and accumulate pages that need writing, and call |
168fc022 TT |
1869 | * mpage_da_map_and_submit to map a single contiguous memory region |
1870 | * and then write them. | |
8e48dcfb TT |
1871 | */ |
1872 | static int write_cache_pages_da(struct address_space *mapping, | |
1873 | struct writeback_control *wbc, | |
72f84e65 ES |
1874 | struct mpage_da_data *mpd, |
1875 | pgoff_t *done_index) | |
8e48dcfb | 1876 | { |
4f01b02c | 1877 | struct buffer_head *bh, *head; |
168fc022 | 1878 | struct inode *inode = mapping->host; |
4f01b02c TT |
1879 | struct pagevec pvec; |
1880 | unsigned int nr_pages; | |
1881 | sector_t logical; | |
1882 | pgoff_t index, end; | |
1883 | long nr_to_write = wbc->nr_to_write; | |
1884 | int i, tag, ret = 0; | |
8e48dcfb | 1885 | |
168fc022 TT |
1886 | memset(mpd, 0, sizeof(struct mpage_da_data)); |
1887 | mpd->wbc = wbc; | |
1888 | mpd->inode = inode; | |
8e48dcfb TT |
1889 | pagevec_init(&pvec, 0); |
1890 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1891 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1892 | ||
6e6938b6 | 1893 | if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) |
5b41d924 ES |
1894 | tag = PAGECACHE_TAG_TOWRITE; |
1895 | else | |
1896 | tag = PAGECACHE_TAG_DIRTY; | |
1897 | ||
72f84e65 | 1898 | *done_index = index; |
4f01b02c | 1899 | while (index <= end) { |
5b41d924 | 1900 | nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
8e48dcfb TT |
1901 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1); |
1902 | if (nr_pages == 0) | |
4f01b02c | 1903 | return 0; |
8e48dcfb TT |
1904 | |
1905 | for (i = 0; i < nr_pages; i++) { | |
1906 | struct page *page = pvec.pages[i]; | |
1907 | ||
1908 | /* | |
1909 | * At this point, the page may be truncated or | |
1910 | * invalidated (changing page->mapping to NULL), or | |
1911 | * even swizzled back from swapper_space to tmpfs file | |
1912 | * mapping. However, page->index will not change | |
1913 | * because we have a reference on the page. | |
1914 | */ | |
4f01b02c TT |
1915 | if (page->index > end) |
1916 | goto out; | |
8e48dcfb | 1917 | |
72f84e65 ES |
1918 | *done_index = page->index + 1; |
1919 | ||
78aaced3 TT |
1920 | /* |
1921 | * If we can't merge this page, and we have | |
1922 | * accumulated an contiguous region, write it | |
1923 | */ | |
1924 | if ((mpd->next_page != page->index) && | |
1925 | (mpd->next_page != mpd->first_page)) { | |
1926 | mpage_da_map_and_submit(mpd); | |
1927 | goto ret_extent_tail; | |
1928 | } | |
1929 | ||
8e48dcfb TT |
1930 | lock_page(page); |
1931 | ||
1932 | /* | |
4f01b02c TT |
1933 | * If the page is no longer dirty, or its |
1934 | * mapping no longer corresponds to inode we | |
1935 | * are writing (which means it has been | |
1936 | * truncated or invalidated), or the page is | |
1937 | * already under writeback and we are not | |
1938 | * doing a data integrity writeback, skip the page | |
8e48dcfb | 1939 | */ |
4f01b02c TT |
1940 | if (!PageDirty(page) || |
1941 | (PageWriteback(page) && | |
1942 | (wbc->sync_mode == WB_SYNC_NONE)) || | |
1943 | unlikely(page->mapping != mapping)) { | |
8e48dcfb TT |
1944 | unlock_page(page); |
1945 | continue; | |
1946 | } | |
1947 | ||
7cb1a535 | 1948 | wait_on_page_writeback(page); |
8e48dcfb | 1949 | BUG_ON(PageWriteback(page)); |
8e48dcfb | 1950 | |
168fc022 | 1951 | if (mpd->next_page != page->index) |
8eb9e5ce | 1952 | mpd->first_page = page->index; |
8eb9e5ce TT |
1953 | mpd->next_page = page->index + 1; |
1954 | logical = (sector_t) page->index << | |
1955 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1956 | ||
1957 | if (!page_has_buffers(page)) { | |
4f01b02c TT |
1958 | mpage_add_bh_to_extent(mpd, logical, |
1959 | PAGE_CACHE_SIZE, | |
8eb9e5ce | 1960 | (1 << BH_Dirty) | (1 << BH_Uptodate)); |
4f01b02c TT |
1961 | if (mpd->io_done) |
1962 | goto ret_extent_tail; | |
8eb9e5ce TT |
1963 | } else { |
1964 | /* | |
4f01b02c TT |
1965 | * Page with regular buffer heads, |
1966 | * just add all dirty ones | |
8eb9e5ce TT |
1967 | */ |
1968 | head = page_buffers(page); | |
1969 | bh = head; | |
1970 | do { | |
1971 | BUG_ON(buffer_locked(bh)); | |
1972 | /* | |
1973 | * We need to try to allocate | |
1974 | * unmapped blocks in the same page. | |
1975 | * Otherwise we won't make progress | |
1976 | * with the page in ext4_writepage | |
1977 | */ | |
1978 | if (ext4_bh_delay_or_unwritten(NULL, bh)) { | |
1979 | mpage_add_bh_to_extent(mpd, logical, | |
1980 | bh->b_size, | |
1981 | bh->b_state); | |
4f01b02c TT |
1982 | if (mpd->io_done) |
1983 | goto ret_extent_tail; | |
8eb9e5ce TT |
1984 | } else if (buffer_dirty(bh) && (buffer_mapped(bh))) { |
1985 | /* | |
4f01b02c TT |
1986 | * mapped dirty buffer. We need |
1987 | * to update the b_state | |
1988 | * because we look at b_state | |
1989 | * in mpage_da_map_blocks. We | |
1990 | * don't update b_size because | |
1991 | * if we find an unmapped | |
1992 | * buffer_head later we need to | |
1993 | * use the b_state flag of that | |
1994 | * buffer_head. | |
8eb9e5ce TT |
1995 | */ |
1996 | if (mpd->b_size == 0) | |
1997 | mpd->b_state = bh->b_state & BH_FLAGS; | |
1998 | } | |
1999 | logical++; | |
2000 | } while ((bh = bh->b_this_page) != head); | |
8e48dcfb TT |
2001 | } |
2002 | ||
2003 | if (nr_to_write > 0) { | |
2004 | nr_to_write--; | |
2005 | if (nr_to_write == 0 && | |
4f01b02c | 2006 | wbc->sync_mode == WB_SYNC_NONE) |
8e48dcfb TT |
2007 | /* |
2008 | * We stop writing back only if we are | |
2009 | * not doing integrity sync. In case of | |
2010 | * integrity sync we have to keep going | |
2011 | * because someone may be concurrently | |
2012 | * dirtying pages, and we might have | |
2013 | * synced a lot of newly appeared dirty | |
2014 | * pages, but have not synced all of the | |
2015 | * old dirty pages. | |
2016 | */ | |
4f01b02c | 2017 | goto out; |
8e48dcfb TT |
2018 | } |
2019 | } | |
2020 | pagevec_release(&pvec); | |
2021 | cond_resched(); | |
2022 | } | |
4f01b02c TT |
2023 | return 0; |
2024 | ret_extent_tail: | |
2025 | ret = MPAGE_DA_EXTENT_TAIL; | |
8eb9e5ce TT |
2026 | out: |
2027 | pagevec_release(&pvec); | |
2028 | cond_resched(); | |
8e48dcfb TT |
2029 | return ret; |
2030 | } | |
2031 | ||
2032 | ||
64769240 | 2033 | static int ext4_da_writepages(struct address_space *mapping, |
a1d6cc56 | 2034 | struct writeback_control *wbc) |
64769240 | 2035 | { |
22208ded AK |
2036 | pgoff_t index; |
2037 | int range_whole = 0; | |
61628a3f | 2038 | handle_t *handle = NULL; |
df22291f | 2039 | struct mpage_da_data mpd; |
5e745b04 | 2040 | struct inode *inode = mapping->host; |
498e5f24 | 2041 | int pages_written = 0; |
55138e0b | 2042 | unsigned int max_pages; |
2acf2c26 | 2043 | int range_cyclic, cycled = 1, io_done = 0; |
55138e0b TT |
2044 | int needed_blocks, ret = 0; |
2045 | long desired_nr_to_write, nr_to_writebump = 0; | |
de89de6e | 2046 | loff_t range_start = wbc->range_start; |
5e745b04 | 2047 | struct ext4_sb_info *sbi = EXT4_SB(mapping->host->i_sb); |
72f84e65 | 2048 | pgoff_t done_index = 0; |
5b41d924 | 2049 | pgoff_t end; |
61628a3f | 2050 | |
9bffad1e | 2051 | trace_ext4_da_writepages(inode, wbc); |
ba80b101 | 2052 | |
61628a3f MC |
2053 | /* |
2054 | * No pages to write? This is mainly a kludge to avoid starting | |
2055 | * a transaction for special inodes like journal inode on last iput() | |
2056 | * because that could violate lock ordering on umount | |
2057 | */ | |
a1d6cc56 | 2058 | if (!mapping->nrpages || !mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) |
61628a3f | 2059 | return 0; |
2a21e37e TT |
2060 | |
2061 | /* | |
2062 | * If the filesystem has aborted, it is read-only, so return | |
2063 | * right away instead of dumping stack traces later on that | |
2064 | * will obscure the real source of the problem. We test | |
4ab2f15b | 2065 | * EXT4_MF_FS_ABORTED instead of sb->s_flag's MS_RDONLY because |
2a21e37e TT |
2066 | * the latter could be true if the filesystem is mounted |
2067 | * read-only, and in that case, ext4_da_writepages should | |
2068 | * *never* be called, so if that ever happens, we would want | |
2069 | * the stack trace. | |
2070 | */ | |
4ab2f15b | 2071 | if (unlikely(sbi->s_mount_flags & EXT4_MF_FS_ABORTED)) |
2a21e37e TT |
2072 | return -EROFS; |
2073 | ||
22208ded AK |
2074 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
2075 | range_whole = 1; | |
61628a3f | 2076 | |
2acf2c26 AK |
2077 | range_cyclic = wbc->range_cyclic; |
2078 | if (wbc->range_cyclic) { | |
22208ded | 2079 | index = mapping->writeback_index; |
2acf2c26 AK |
2080 | if (index) |
2081 | cycled = 0; | |
2082 | wbc->range_start = index << PAGE_CACHE_SHIFT; | |
2083 | wbc->range_end = LLONG_MAX; | |
2084 | wbc->range_cyclic = 0; | |
5b41d924 ES |
2085 | end = -1; |
2086 | } else { | |
22208ded | 2087 | index = wbc->range_start >> PAGE_CACHE_SHIFT; |
5b41d924 ES |
2088 | end = wbc->range_end >> PAGE_CACHE_SHIFT; |
2089 | } | |
a1d6cc56 | 2090 | |
55138e0b TT |
2091 | /* |
2092 | * This works around two forms of stupidity. The first is in | |
2093 | * the writeback code, which caps the maximum number of pages | |
2094 | * written to be 1024 pages. This is wrong on multiple | |
2095 | * levels; different architectues have a different page size, | |
2096 | * which changes the maximum amount of data which gets | |
2097 | * written. Secondly, 4 megabytes is way too small. XFS | |
2098 | * forces this value to be 16 megabytes by multiplying | |
2099 | * nr_to_write parameter by four, and then relies on its | |
2100 | * allocator to allocate larger extents to make them | |
2101 | * contiguous. Unfortunately this brings us to the second | |
2102 | * stupidity, which is that ext4's mballoc code only allocates | |
2103 | * at most 2048 blocks. So we force contiguous writes up to | |
2104 | * the number of dirty blocks in the inode, or | |
2105 | * sbi->max_writeback_mb_bump whichever is smaller. | |
2106 | */ | |
2107 | max_pages = sbi->s_max_writeback_mb_bump << (20 - PAGE_CACHE_SHIFT); | |
b443e733 ES |
2108 | if (!range_cyclic && range_whole) { |
2109 | if (wbc->nr_to_write == LONG_MAX) | |
2110 | desired_nr_to_write = wbc->nr_to_write; | |
2111 | else | |
2112 | desired_nr_to_write = wbc->nr_to_write * 8; | |
2113 | } else | |
55138e0b TT |
2114 | desired_nr_to_write = ext4_num_dirty_pages(inode, index, |
2115 | max_pages); | |
2116 | if (desired_nr_to_write > max_pages) | |
2117 | desired_nr_to_write = max_pages; | |
2118 | ||
2119 | if (wbc->nr_to_write < desired_nr_to_write) { | |
2120 | nr_to_writebump = desired_nr_to_write - wbc->nr_to_write; | |
2121 | wbc->nr_to_write = desired_nr_to_write; | |
2122 | } | |
2123 | ||
2acf2c26 | 2124 | retry: |
6e6938b6 | 2125 | if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) |
5b41d924 ES |
2126 | tag_pages_for_writeback(mapping, index, end); |
2127 | ||
22208ded | 2128 | while (!ret && wbc->nr_to_write > 0) { |
a1d6cc56 AK |
2129 | |
2130 | /* | |
2131 | * we insert one extent at a time. So we need | |
2132 | * credit needed for single extent allocation. | |
2133 | * journalled mode is currently not supported | |
2134 | * by delalloc | |
2135 | */ | |
2136 | BUG_ON(ext4_should_journal_data(inode)); | |
525f4ed8 | 2137 | needed_blocks = ext4_da_writepages_trans_blocks(inode); |
a1d6cc56 | 2138 | |
61628a3f MC |
2139 | /* start a new transaction*/ |
2140 | handle = ext4_journal_start(inode, needed_blocks); | |
2141 | if (IS_ERR(handle)) { | |
2142 | ret = PTR_ERR(handle); | |
1693918e | 2143 | ext4_msg(inode->i_sb, KERN_CRIT, "%s: jbd2_start: " |
fbe845dd | 2144 | "%ld pages, ino %lu; err %d", __func__, |
a1d6cc56 | 2145 | wbc->nr_to_write, inode->i_ino, ret); |
61628a3f MC |
2146 | goto out_writepages; |
2147 | } | |
f63e6005 TT |
2148 | |
2149 | /* | |
8eb9e5ce | 2150 | * Now call write_cache_pages_da() to find the next |
f63e6005 | 2151 | * contiguous region of logical blocks that need |
8eb9e5ce | 2152 | * blocks to be allocated by ext4 and submit them. |
f63e6005 | 2153 | */ |
72f84e65 | 2154 | ret = write_cache_pages_da(mapping, wbc, &mpd, &done_index); |
f63e6005 | 2155 | /* |
af901ca1 | 2156 | * If we have a contiguous extent of pages and we |
f63e6005 TT |
2157 | * haven't done the I/O yet, map the blocks and submit |
2158 | * them for I/O. | |
2159 | */ | |
2160 | if (!mpd.io_done && mpd.next_page != mpd.first_page) { | |
5a87b7a5 | 2161 | mpage_da_map_and_submit(&mpd); |
f63e6005 TT |
2162 | ret = MPAGE_DA_EXTENT_TAIL; |
2163 | } | |
b3a3ca8c | 2164 | trace_ext4_da_write_pages(inode, &mpd); |
f63e6005 | 2165 | wbc->nr_to_write -= mpd.pages_written; |
df22291f | 2166 | |
61628a3f | 2167 | ext4_journal_stop(handle); |
df22291f | 2168 | |
8f64b32e | 2169 | if ((mpd.retval == -ENOSPC) && sbi->s_journal) { |
22208ded AK |
2170 | /* commit the transaction which would |
2171 | * free blocks released in the transaction | |
2172 | * and try again | |
2173 | */ | |
df22291f | 2174 | jbd2_journal_force_commit_nested(sbi->s_journal); |
22208ded AK |
2175 | ret = 0; |
2176 | } else if (ret == MPAGE_DA_EXTENT_TAIL) { | |
a1d6cc56 AK |
2177 | /* |
2178 | * got one extent now try with | |
2179 | * rest of the pages | |
2180 | */ | |
22208ded | 2181 | pages_written += mpd.pages_written; |
a1d6cc56 | 2182 | ret = 0; |
2acf2c26 | 2183 | io_done = 1; |
22208ded | 2184 | } else if (wbc->nr_to_write) |
61628a3f MC |
2185 | /* |
2186 | * There is no more writeout needed | |
2187 | * or we requested for a noblocking writeout | |
2188 | * and we found the device congested | |
2189 | */ | |
61628a3f | 2190 | break; |
a1d6cc56 | 2191 | } |
2acf2c26 AK |
2192 | if (!io_done && !cycled) { |
2193 | cycled = 1; | |
2194 | index = 0; | |
2195 | wbc->range_start = index << PAGE_CACHE_SHIFT; | |
2196 | wbc->range_end = mapping->writeback_index - 1; | |
2197 | goto retry; | |
2198 | } | |
22208ded AK |
2199 | |
2200 | /* Update index */ | |
2acf2c26 | 2201 | wbc->range_cyclic = range_cyclic; |
22208ded AK |
2202 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
2203 | /* | |
2204 | * set the writeback_index so that range_cyclic | |
2205 | * mode will write it back later | |
2206 | */ | |
72f84e65 | 2207 | mapping->writeback_index = done_index; |
a1d6cc56 | 2208 | |
61628a3f | 2209 | out_writepages: |
2faf2e19 | 2210 | wbc->nr_to_write -= nr_to_writebump; |
de89de6e | 2211 | wbc->range_start = range_start; |
9bffad1e | 2212 | trace_ext4_da_writepages_result(inode, wbc, ret, pages_written); |
61628a3f | 2213 | return ret; |
64769240 AT |
2214 | } |
2215 | ||
79f0be8d AK |
2216 | #define FALL_BACK_TO_NONDELALLOC 1 |
2217 | static int ext4_nonda_switch(struct super_block *sb) | |
2218 | { | |
2219 | s64 free_blocks, dirty_blocks; | |
2220 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
2221 | ||
2222 | /* | |
2223 | * switch to non delalloc mode if we are running low | |
2224 | * on free block. The free block accounting via percpu | |
179f7ebf | 2225 | * counters can get slightly wrong with percpu_counter_batch getting |
79f0be8d AK |
2226 | * accumulated on each CPU without updating global counters |
2227 | * Delalloc need an accurate free block accounting. So switch | |
2228 | * to non delalloc when we are near to error range. | |
2229 | */ | |
57042651 TT |
2230 | free_blocks = EXT4_C2B(sbi, |
2231 | percpu_counter_read_positive(&sbi->s_freeclusters_counter)); | |
2232 | dirty_blocks = percpu_counter_read_positive(&sbi->s_dirtyclusters_counter); | |
79f0be8d AK |
2233 | if (2 * free_blocks < 3 * dirty_blocks || |
2234 | free_blocks < (dirty_blocks + EXT4_FREEBLOCKS_WATERMARK)) { | |
2235 | /* | |
c8afb446 ES |
2236 | * free block count is less than 150% of dirty blocks |
2237 | * or free blocks is less than watermark | |
79f0be8d AK |
2238 | */ |
2239 | return 1; | |
2240 | } | |
c8afb446 ES |
2241 | /* |
2242 | * Even if we don't switch but are nearing capacity, | |
2243 | * start pushing delalloc when 1/2 of free blocks are dirty. | |
2244 | */ | |
2245 | if (free_blocks < 2 * dirty_blocks) | |
2246 | writeback_inodes_sb_if_idle(sb); | |
2247 | ||
79f0be8d AK |
2248 | return 0; |
2249 | } | |
2250 | ||
64769240 | 2251 | static int ext4_da_write_begin(struct file *file, struct address_space *mapping, |
de9a55b8 TT |
2252 | loff_t pos, unsigned len, unsigned flags, |
2253 | struct page **pagep, void **fsdata) | |
64769240 | 2254 | { |
72b8ab9d | 2255 | int ret, retries = 0; |
64769240 AT |
2256 | struct page *page; |
2257 | pgoff_t index; | |
64769240 AT |
2258 | struct inode *inode = mapping->host; |
2259 | handle_t *handle; | |
02fac129 | 2260 | loff_t page_len; |
64769240 AT |
2261 | |
2262 | index = pos >> PAGE_CACHE_SHIFT; | |
79f0be8d AK |
2263 | |
2264 | if (ext4_nonda_switch(inode->i_sb)) { | |
2265 | *fsdata = (void *)FALL_BACK_TO_NONDELALLOC; | |
2266 | return ext4_write_begin(file, mapping, pos, | |
2267 | len, flags, pagep, fsdata); | |
2268 | } | |
2269 | *fsdata = (void *)0; | |
9bffad1e | 2270 | trace_ext4_da_write_begin(inode, pos, len, flags); |
d2a17637 | 2271 | retry: |
64769240 AT |
2272 | /* |
2273 | * With delayed allocation, we don't log the i_disksize update | |
2274 | * if there is delayed block allocation. But we still need | |
2275 | * to journalling the i_disksize update if writes to the end | |
2276 | * of file which has an already mapped buffer. | |
2277 | */ | |
2278 | handle = ext4_journal_start(inode, 1); | |
2279 | if (IS_ERR(handle)) { | |
2280 | ret = PTR_ERR(handle); | |
2281 | goto out; | |
2282 | } | |
ebd3610b JK |
2283 | /* We cannot recurse into the filesystem as the transaction is already |
2284 | * started */ | |
2285 | flags |= AOP_FLAG_NOFS; | |
64769240 | 2286 | |
54566b2c | 2287 | page = grab_cache_page_write_begin(mapping, index, flags); |
d5a0d4f7 ES |
2288 | if (!page) { |
2289 | ext4_journal_stop(handle); | |
2290 | ret = -ENOMEM; | |
2291 | goto out; | |
2292 | } | |
64769240 AT |
2293 | *pagep = page; |
2294 | ||
6e1db88d | 2295 | ret = __block_write_begin(page, pos, len, ext4_da_get_block_prep); |
64769240 AT |
2296 | if (ret < 0) { |
2297 | unlock_page(page); | |
2298 | ext4_journal_stop(handle); | |
2299 | page_cache_release(page); | |
ae4d5372 AK |
2300 | /* |
2301 | * block_write_begin may have instantiated a few blocks | |
2302 | * outside i_size. Trim these off again. Don't need | |
2303 | * i_size_read because we hold i_mutex. | |
2304 | */ | |
2305 | if (pos + len > inode->i_size) | |
b9a4207d | 2306 | ext4_truncate_failed_write(inode); |
02fac129 AH |
2307 | } else { |
2308 | page_len = pos & (PAGE_CACHE_SIZE - 1); | |
2309 | if (page_len > 0) { | |
2310 | ret = ext4_discard_partial_page_buffers_no_lock(handle, | |
2311 | inode, page, pos - page_len, page_len, | |
2312 | EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED); | |
2313 | } | |
64769240 AT |
2314 | } |
2315 | ||
d2a17637 MC |
2316 | if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) |
2317 | goto retry; | |
64769240 AT |
2318 | out: |
2319 | return ret; | |
2320 | } | |
2321 | ||
632eaeab MC |
2322 | /* |
2323 | * Check if we should update i_disksize | |
2324 | * when write to the end of file but not require block allocation | |
2325 | */ | |
2326 | static int ext4_da_should_update_i_disksize(struct page *page, | |
de9a55b8 | 2327 | unsigned long offset) |
632eaeab MC |
2328 | { |
2329 | struct buffer_head *bh; | |
2330 | struct inode *inode = page->mapping->host; | |
2331 | unsigned int idx; | |
2332 | int i; | |
2333 | ||
2334 | bh = page_buffers(page); | |
2335 | idx = offset >> inode->i_blkbits; | |
2336 | ||
af5bc92d | 2337 | for (i = 0; i < idx; i++) |
632eaeab MC |
2338 | bh = bh->b_this_page; |
2339 | ||
29fa89d0 | 2340 | if (!buffer_mapped(bh) || (buffer_delay(bh)) || buffer_unwritten(bh)) |
632eaeab MC |
2341 | return 0; |
2342 | return 1; | |
2343 | } | |
2344 | ||
64769240 | 2345 | static int ext4_da_write_end(struct file *file, |
de9a55b8 TT |
2346 | struct address_space *mapping, |
2347 | loff_t pos, unsigned len, unsigned copied, | |
2348 | struct page *page, void *fsdata) | |
64769240 AT |
2349 | { |
2350 | struct inode *inode = mapping->host; | |
2351 | int ret = 0, ret2; | |
2352 | handle_t *handle = ext4_journal_current_handle(); | |
2353 | loff_t new_i_size; | |
632eaeab | 2354 | unsigned long start, end; |
79f0be8d | 2355 | int write_mode = (int)(unsigned long)fsdata; |
02fac129 | 2356 | loff_t page_len; |
79f0be8d AK |
2357 | |
2358 | if (write_mode == FALL_BACK_TO_NONDELALLOC) { | |
2359 | if (ext4_should_order_data(inode)) { | |
2360 | return ext4_ordered_write_end(file, mapping, pos, | |
2361 | len, copied, page, fsdata); | |
2362 | } else if (ext4_should_writeback_data(inode)) { | |
2363 | return ext4_writeback_write_end(file, mapping, pos, | |
2364 | len, copied, page, fsdata); | |
2365 | } else { | |
2366 | BUG(); | |
2367 | } | |
2368 | } | |
632eaeab | 2369 | |
9bffad1e | 2370 | trace_ext4_da_write_end(inode, pos, len, copied); |
632eaeab | 2371 | start = pos & (PAGE_CACHE_SIZE - 1); |
af5bc92d | 2372 | end = start + copied - 1; |
64769240 AT |
2373 | |
2374 | /* | |
2375 | * generic_write_end() will run mark_inode_dirty() if i_size | |
2376 | * changes. So let's piggyback the i_disksize mark_inode_dirty | |
2377 | * into that. | |
2378 | */ | |
2379 | ||
2380 | new_i_size = pos + copied; | |
632eaeab MC |
2381 | if (new_i_size > EXT4_I(inode)->i_disksize) { |
2382 | if (ext4_da_should_update_i_disksize(page, end)) { | |
2383 | down_write(&EXT4_I(inode)->i_data_sem); | |
2384 | if (new_i_size > EXT4_I(inode)->i_disksize) { | |
2385 | /* | |
2386 | * Updating i_disksize when extending file | |
2387 | * without needing block allocation | |
2388 | */ | |
2389 | if (ext4_should_order_data(inode)) | |
2390 | ret = ext4_jbd2_file_inode(handle, | |
2391 | inode); | |
64769240 | 2392 | |
632eaeab MC |
2393 | EXT4_I(inode)->i_disksize = new_i_size; |
2394 | } | |
2395 | up_write(&EXT4_I(inode)->i_data_sem); | |
cf17fea6 AK |
2396 | /* We need to mark inode dirty even if |
2397 | * new_i_size is less that inode->i_size | |
2398 | * bu greater than i_disksize.(hint delalloc) | |
2399 | */ | |
2400 | ext4_mark_inode_dirty(handle, inode); | |
64769240 | 2401 | } |
632eaeab | 2402 | } |
64769240 AT |
2403 | ret2 = generic_write_end(file, mapping, pos, len, copied, |
2404 | page, fsdata); | |
02fac129 AH |
2405 | |
2406 | page_len = PAGE_CACHE_SIZE - | |
2407 | ((pos + copied - 1) & (PAGE_CACHE_SIZE - 1)); | |
2408 | ||
2409 | if (page_len > 0) { | |
2410 | ret = ext4_discard_partial_page_buffers_no_lock(handle, | |
2411 | inode, page, pos + copied - 1, page_len, | |
2412 | EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED); | |
2413 | } | |
2414 | ||
64769240 AT |
2415 | copied = ret2; |
2416 | if (ret2 < 0) | |
2417 | ret = ret2; | |
2418 | ret2 = ext4_journal_stop(handle); | |
2419 | if (!ret) | |
2420 | ret = ret2; | |
2421 | ||
2422 | return ret ? ret : copied; | |
2423 | } | |
2424 | ||
2425 | static void ext4_da_invalidatepage(struct page *page, unsigned long offset) | |
2426 | { | |
64769240 AT |
2427 | /* |
2428 | * Drop reserved blocks | |
2429 | */ | |
2430 | BUG_ON(!PageLocked(page)); | |
2431 | if (!page_has_buffers(page)) | |
2432 | goto out; | |
2433 | ||
d2a17637 | 2434 | ext4_da_page_release_reservation(page, offset); |
64769240 AT |
2435 | |
2436 | out: | |
2437 | ext4_invalidatepage(page, offset); | |
2438 | ||
2439 | return; | |
2440 | } | |
2441 | ||
ccd2506b TT |
2442 | /* |
2443 | * Force all delayed allocation blocks to be allocated for a given inode. | |
2444 | */ | |
2445 | int ext4_alloc_da_blocks(struct inode *inode) | |
2446 | { | |
fb40ba0d TT |
2447 | trace_ext4_alloc_da_blocks(inode); |
2448 | ||
ccd2506b TT |
2449 | if (!EXT4_I(inode)->i_reserved_data_blocks && |
2450 | !EXT4_I(inode)->i_reserved_meta_blocks) | |
2451 | return 0; | |
2452 | ||
2453 | /* | |
2454 | * We do something simple for now. The filemap_flush() will | |
2455 | * also start triggering a write of the data blocks, which is | |
2456 | * not strictly speaking necessary (and for users of | |
2457 | * laptop_mode, not even desirable). However, to do otherwise | |
2458 | * would require replicating code paths in: | |
de9a55b8 | 2459 | * |
ccd2506b TT |
2460 | * ext4_da_writepages() -> |
2461 | * write_cache_pages() ---> (via passed in callback function) | |
2462 | * __mpage_da_writepage() --> | |
2463 | * mpage_add_bh_to_extent() | |
2464 | * mpage_da_map_blocks() | |
2465 | * | |
2466 | * The problem is that write_cache_pages(), located in | |
2467 | * mm/page-writeback.c, marks pages clean in preparation for | |
2468 | * doing I/O, which is not desirable if we're not planning on | |
2469 | * doing I/O at all. | |
2470 | * | |
2471 | * We could call write_cache_pages(), and then redirty all of | |
380cf090 | 2472 | * the pages by calling redirty_page_for_writepage() but that |
ccd2506b TT |
2473 | * would be ugly in the extreme. So instead we would need to |
2474 | * replicate parts of the code in the above functions, | |
25985edc | 2475 | * simplifying them because we wouldn't actually intend to |
ccd2506b TT |
2476 | * write out the pages, but rather only collect contiguous |
2477 | * logical block extents, call the multi-block allocator, and | |
2478 | * then update the buffer heads with the block allocations. | |
de9a55b8 | 2479 | * |
ccd2506b TT |
2480 | * For now, though, we'll cheat by calling filemap_flush(), |
2481 | * which will map the blocks, and start the I/O, but not | |
2482 | * actually wait for the I/O to complete. | |
2483 | */ | |
2484 | return filemap_flush(inode->i_mapping); | |
2485 | } | |
64769240 | 2486 | |
ac27a0ec DK |
2487 | /* |
2488 | * bmap() is special. It gets used by applications such as lilo and by | |
2489 | * the swapper to find the on-disk block of a specific piece of data. | |
2490 | * | |
2491 | * Naturally, this is dangerous if the block concerned is still in the | |
617ba13b | 2492 | * journal. If somebody makes a swapfile on an ext4 data-journaling |
ac27a0ec DK |
2493 | * filesystem and enables swap, then they may get a nasty shock when the |
2494 | * data getting swapped to that swapfile suddenly gets overwritten by | |
2495 | * the original zero's written out previously to the journal and | |
2496 | * awaiting writeback in the kernel's buffer cache. | |
2497 | * | |
2498 | * So, if we see any bmap calls here on a modified, data-journaled file, | |
2499 | * take extra steps to flush any blocks which might be in the cache. | |
2500 | */ | |
617ba13b | 2501 | static sector_t ext4_bmap(struct address_space *mapping, sector_t block) |
ac27a0ec DK |
2502 | { |
2503 | struct inode *inode = mapping->host; | |
2504 | journal_t *journal; | |
2505 | int err; | |
2506 | ||
64769240 AT |
2507 | if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY) && |
2508 | test_opt(inode->i_sb, DELALLOC)) { | |
2509 | /* | |
2510 | * With delalloc we want to sync the file | |
2511 | * so that we can make sure we allocate | |
2512 | * blocks for file | |
2513 | */ | |
2514 | filemap_write_and_wait(mapping); | |
2515 | } | |
2516 | ||
19f5fb7a TT |
2517 | if (EXT4_JOURNAL(inode) && |
2518 | ext4_test_inode_state(inode, EXT4_STATE_JDATA)) { | |
ac27a0ec DK |
2519 | /* |
2520 | * This is a REALLY heavyweight approach, but the use of | |
2521 | * bmap on dirty files is expected to be extremely rare: | |
2522 | * only if we run lilo or swapon on a freshly made file | |
2523 | * do we expect this to happen. | |
2524 | * | |
2525 | * (bmap requires CAP_SYS_RAWIO so this does not | |
2526 | * represent an unprivileged user DOS attack --- we'd be | |
2527 | * in trouble if mortal users could trigger this path at | |
2528 | * will.) | |
2529 | * | |
617ba13b | 2530 | * NB. EXT4_STATE_JDATA is not set on files other than |
ac27a0ec DK |
2531 | * regular files. If somebody wants to bmap a directory |
2532 | * or symlink and gets confused because the buffer | |
2533 | * hasn't yet been flushed to disk, they deserve | |
2534 | * everything they get. | |
2535 | */ | |
2536 | ||
19f5fb7a | 2537 | ext4_clear_inode_state(inode, EXT4_STATE_JDATA); |
617ba13b | 2538 | journal = EXT4_JOURNAL(inode); |
dab291af MC |
2539 | jbd2_journal_lock_updates(journal); |
2540 | err = jbd2_journal_flush(journal); | |
2541 | jbd2_journal_unlock_updates(journal); | |
ac27a0ec DK |
2542 | |
2543 | if (err) | |
2544 | return 0; | |
2545 | } | |
2546 | ||
af5bc92d | 2547 | return generic_block_bmap(mapping, block, ext4_get_block); |
ac27a0ec DK |
2548 | } |
2549 | ||
617ba13b | 2550 | static int ext4_readpage(struct file *file, struct page *page) |
ac27a0ec | 2551 | { |
0562e0ba | 2552 | trace_ext4_readpage(page); |
617ba13b | 2553 | return mpage_readpage(page, ext4_get_block); |
ac27a0ec DK |
2554 | } |
2555 | ||
2556 | static int | |
617ba13b | 2557 | ext4_readpages(struct file *file, struct address_space *mapping, |
ac27a0ec DK |
2558 | struct list_head *pages, unsigned nr_pages) |
2559 | { | |
617ba13b | 2560 | return mpage_readpages(mapping, pages, nr_pages, ext4_get_block); |
ac27a0ec DK |
2561 | } |
2562 | ||
744692dc JZ |
2563 | static void ext4_invalidatepage_free_endio(struct page *page, unsigned long offset) |
2564 | { | |
2565 | struct buffer_head *head, *bh; | |
2566 | unsigned int curr_off = 0; | |
2567 | ||
2568 | if (!page_has_buffers(page)) | |
2569 | return; | |
2570 | head = bh = page_buffers(page); | |
2571 | do { | |
2572 | if (offset <= curr_off && test_clear_buffer_uninit(bh) | |
2573 | && bh->b_private) { | |
2574 | ext4_free_io_end(bh->b_private); | |
2575 | bh->b_private = NULL; | |
2576 | bh->b_end_io = NULL; | |
2577 | } | |
2578 | curr_off = curr_off + bh->b_size; | |
2579 | bh = bh->b_this_page; | |
2580 | } while (bh != head); | |
2581 | } | |
2582 | ||
617ba13b | 2583 | static void ext4_invalidatepage(struct page *page, unsigned long offset) |
ac27a0ec | 2584 | { |
617ba13b | 2585 | journal_t *journal = EXT4_JOURNAL(page->mapping->host); |
ac27a0ec | 2586 | |
0562e0ba JZ |
2587 | trace_ext4_invalidatepage(page, offset); |
2588 | ||
744692dc JZ |
2589 | /* |
2590 | * free any io_end structure allocated for buffers to be discarded | |
2591 | */ | |
2592 | if (ext4_should_dioread_nolock(page->mapping->host)) | |
2593 | ext4_invalidatepage_free_endio(page, offset); | |
ac27a0ec DK |
2594 | /* |
2595 | * If it's a full truncate we just forget about the pending dirtying | |
2596 | */ | |
2597 | if (offset == 0) | |
2598 | ClearPageChecked(page); | |
2599 | ||
0390131b FM |
2600 | if (journal) |
2601 | jbd2_journal_invalidatepage(journal, page, offset); | |
2602 | else | |
2603 | block_invalidatepage(page, offset); | |
ac27a0ec DK |
2604 | } |
2605 | ||
617ba13b | 2606 | static int ext4_releasepage(struct page *page, gfp_t wait) |
ac27a0ec | 2607 | { |
617ba13b | 2608 | journal_t *journal = EXT4_JOURNAL(page->mapping->host); |
ac27a0ec | 2609 | |
0562e0ba JZ |
2610 | trace_ext4_releasepage(page); |
2611 | ||
ac27a0ec DK |
2612 | WARN_ON(PageChecked(page)); |
2613 | if (!page_has_buffers(page)) | |
2614 | return 0; | |
0390131b FM |
2615 | if (journal) |
2616 | return jbd2_journal_try_to_free_buffers(journal, page, wait); | |
2617 | else | |
2618 | return try_to_free_buffers(page); | |
ac27a0ec DK |
2619 | } |
2620 | ||
2ed88685 TT |
2621 | /* |
2622 | * ext4_get_block used when preparing for a DIO write or buffer write. | |
2623 | * We allocate an uinitialized extent if blocks haven't been allocated. | |
2624 | * The extent will be converted to initialized after the IO is complete. | |
2625 | */ | |
c7064ef1 | 2626 | static int ext4_get_block_write(struct inode *inode, sector_t iblock, |
4c0425ff MC |
2627 | struct buffer_head *bh_result, int create) |
2628 | { | |
c7064ef1 | 2629 | ext4_debug("ext4_get_block_write: inode %lu, create flag %d\n", |
8d5d02e6 | 2630 | inode->i_ino, create); |
2ed88685 TT |
2631 | return _ext4_get_block(inode, iblock, bh_result, |
2632 | EXT4_GET_BLOCKS_IO_CREATE_EXT); | |
4c0425ff MC |
2633 | } |
2634 | ||
4c0425ff | 2635 | static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset, |
552ef802 CH |
2636 | ssize_t size, void *private, int ret, |
2637 | bool is_async) | |
4c0425ff | 2638 | { |
72c5052d | 2639 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
4c0425ff MC |
2640 | ext4_io_end_t *io_end = iocb->private; |
2641 | struct workqueue_struct *wq; | |
744692dc JZ |
2642 | unsigned long flags; |
2643 | struct ext4_inode_info *ei; | |
4c0425ff | 2644 | |
4b70df18 M |
2645 | /* if not async direct IO or dio with 0 bytes write, just return */ |
2646 | if (!io_end || !size) | |
552ef802 | 2647 | goto out; |
4b70df18 | 2648 | |
8d5d02e6 MC |
2649 | ext_debug("ext4_end_io_dio(): io_end 0x%p" |
2650 | "for inode %lu, iocb 0x%p, offset %llu, size %llu\n", | |
2651 | iocb->private, io_end->inode->i_ino, iocb, offset, | |
2652 | size); | |
8d5d02e6 MC |
2653 | |
2654 | /* if not aio dio with unwritten extents, just free io and return */ | |
bd2d0210 | 2655 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { |
8d5d02e6 MC |
2656 | ext4_free_io_end(io_end); |
2657 | iocb->private = NULL; | |
5b3ff237 JZ |
2658 | out: |
2659 | if (is_async) | |
2660 | aio_complete(iocb, ret, 0); | |
72c5052d | 2661 | inode_dio_done(inode); |
5b3ff237 | 2662 | return; |
8d5d02e6 MC |
2663 | } |
2664 | ||
4c0425ff MC |
2665 | io_end->offset = offset; |
2666 | io_end->size = size; | |
5b3ff237 JZ |
2667 | if (is_async) { |
2668 | io_end->iocb = iocb; | |
2669 | io_end->result = ret; | |
2670 | } | |
4c0425ff MC |
2671 | wq = EXT4_SB(io_end->inode->i_sb)->dio_unwritten_wq; |
2672 | ||
8d5d02e6 | 2673 | /* Add the io_end to per-inode completed aio dio list*/ |
744692dc JZ |
2674 | ei = EXT4_I(io_end->inode); |
2675 | spin_lock_irqsave(&ei->i_completed_io_lock, flags); | |
2676 | list_add_tail(&io_end->list, &ei->i_completed_io_list); | |
2677 | spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); | |
c999af2b ES |
2678 | |
2679 | /* queue the work to convert unwritten extents to written */ | |
2680 | queue_work(wq, &io_end->work); | |
4c0425ff | 2681 | iocb->private = NULL; |
72c5052d CH |
2682 | |
2683 | /* XXX: probably should move into the real I/O completion handler */ | |
2684 | inode_dio_done(inode); | |
4c0425ff | 2685 | } |
c7064ef1 | 2686 | |
744692dc JZ |
2687 | static void ext4_end_io_buffer_write(struct buffer_head *bh, int uptodate) |
2688 | { | |
2689 | ext4_io_end_t *io_end = bh->b_private; | |
2690 | struct workqueue_struct *wq; | |
2691 | struct inode *inode; | |
2692 | unsigned long flags; | |
2693 | ||
2694 | if (!test_clear_buffer_uninit(bh) || !io_end) | |
2695 | goto out; | |
2696 | ||
2697 | if (!(io_end->inode->i_sb->s_flags & MS_ACTIVE)) { | |
2698 | printk("sb umounted, discard end_io request for inode %lu\n", | |
2699 | io_end->inode->i_ino); | |
2700 | ext4_free_io_end(io_end); | |
2701 | goto out; | |
2702 | } | |
2703 | ||
32c80b32 TM |
2704 | /* |
2705 | * It may be over-defensive here to check EXT4_IO_END_UNWRITTEN now, | |
2706 | * but being more careful is always safe for the future change. | |
2707 | */ | |
744692dc | 2708 | inode = io_end->inode; |
32c80b32 TM |
2709 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { |
2710 | io_end->flag |= EXT4_IO_END_UNWRITTEN; | |
2711 | atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten); | |
2712 | } | |
744692dc JZ |
2713 | |
2714 | /* Add the io_end to per-inode completed io list*/ | |
2715 | spin_lock_irqsave(&EXT4_I(inode)->i_completed_io_lock, flags); | |
2716 | list_add_tail(&io_end->list, &EXT4_I(inode)->i_completed_io_list); | |
2717 | spin_unlock_irqrestore(&EXT4_I(inode)->i_completed_io_lock, flags); | |
2718 | ||
2719 | wq = EXT4_SB(inode->i_sb)->dio_unwritten_wq; | |
2720 | /* queue the work to convert unwritten extents to written */ | |
2721 | queue_work(wq, &io_end->work); | |
2722 | out: | |
2723 | bh->b_private = NULL; | |
2724 | bh->b_end_io = NULL; | |
2725 | clear_buffer_uninit(bh); | |
2726 | end_buffer_async_write(bh, uptodate); | |
2727 | } | |
2728 | ||
2729 | static int ext4_set_bh_endio(struct buffer_head *bh, struct inode *inode) | |
2730 | { | |
2731 | ext4_io_end_t *io_end; | |
2732 | struct page *page = bh->b_page; | |
2733 | loff_t offset = (sector_t)page->index << PAGE_CACHE_SHIFT; | |
2734 | size_t size = bh->b_size; | |
2735 | ||
2736 | retry: | |
2737 | io_end = ext4_init_io_end(inode, GFP_ATOMIC); | |
2738 | if (!io_end) { | |
6db26ffc | 2739 | pr_warn_ratelimited("%s: allocation fail\n", __func__); |
744692dc JZ |
2740 | schedule(); |
2741 | goto retry; | |
2742 | } | |
2743 | io_end->offset = offset; | |
2744 | io_end->size = size; | |
2745 | /* | |
2746 | * We need to hold a reference to the page to make sure it | |
2747 | * doesn't get evicted before ext4_end_io_work() has a chance | |
2748 | * to convert the extent from written to unwritten. | |
2749 | */ | |
2750 | io_end->page = page; | |
2751 | get_page(io_end->page); | |
2752 | ||
2753 | bh->b_private = io_end; | |
2754 | bh->b_end_io = ext4_end_io_buffer_write; | |
2755 | return 0; | |
2756 | } | |
2757 | ||
4c0425ff MC |
2758 | /* |
2759 | * For ext4 extent files, ext4 will do direct-io write to holes, | |
2760 | * preallocated extents, and those write extend the file, no need to | |
2761 | * fall back to buffered IO. | |
2762 | * | |
b595076a | 2763 | * For holes, we fallocate those blocks, mark them as uninitialized |
4c0425ff | 2764 | * If those blocks were preallocated, we mark sure they are splited, but |
b595076a | 2765 | * still keep the range to write as uninitialized. |
4c0425ff | 2766 | * |
8d5d02e6 MC |
2767 | * The unwrritten extents will be converted to written when DIO is completed. |
2768 | * For async direct IO, since the IO may still pending when return, we | |
25985edc | 2769 | * set up an end_io call back function, which will do the conversion |
8d5d02e6 | 2770 | * when async direct IO completed. |
4c0425ff MC |
2771 | * |
2772 | * If the O_DIRECT write will extend the file then add this inode to the | |
2773 | * orphan list. So recovery will truncate it back to the original size | |
2774 | * if the machine crashes during the write. | |
2775 | * | |
2776 | */ | |
2777 | static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb, | |
2778 | const struct iovec *iov, loff_t offset, | |
2779 | unsigned long nr_segs) | |
2780 | { | |
2781 | struct file *file = iocb->ki_filp; | |
2782 | struct inode *inode = file->f_mapping->host; | |
2783 | ssize_t ret; | |
2784 | size_t count = iov_length(iov, nr_segs); | |
2785 | ||
2786 | loff_t final_size = offset + count; | |
2787 | if (rw == WRITE && final_size <= inode->i_size) { | |
2788 | /* | |
8d5d02e6 MC |
2789 | * We could direct write to holes and fallocate. |
2790 | * | |
2791 | * Allocated blocks to fill the hole are marked as uninitialized | |
25985edc | 2792 | * to prevent parallel buffered read to expose the stale data |
4c0425ff | 2793 | * before DIO complete the data IO. |
8d5d02e6 MC |
2794 | * |
2795 | * As to previously fallocated extents, ext4 get_block | |
4c0425ff MC |
2796 | * will just simply mark the buffer mapped but still |
2797 | * keep the extents uninitialized. | |
2798 | * | |
8d5d02e6 MC |
2799 | * for non AIO case, we will convert those unwritten extents |
2800 | * to written after return back from blockdev_direct_IO. | |
2801 | * | |
2802 | * for async DIO, the conversion needs to be defered when | |
2803 | * the IO is completed. The ext4 end_io callback function | |
2804 | * will be called to take care of the conversion work. | |
2805 | * Here for async case, we allocate an io_end structure to | |
2806 | * hook to the iocb. | |
4c0425ff | 2807 | */ |
8d5d02e6 MC |
2808 | iocb->private = NULL; |
2809 | EXT4_I(inode)->cur_aio_dio = NULL; | |
2810 | if (!is_sync_kiocb(iocb)) { | |
744692dc | 2811 | iocb->private = ext4_init_io_end(inode, GFP_NOFS); |
8d5d02e6 MC |
2812 | if (!iocb->private) |
2813 | return -ENOMEM; | |
2814 | /* | |
2815 | * we save the io structure for current async | |
79e83036 | 2816 | * direct IO, so that later ext4_map_blocks() |
8d5d02e6 MC |
2817 | * could flag the io structure whether there |
2818 | * is a unwritten extents needs to be converted | |
2819 | * when IO is completed. | |
2820 | */ | |
2821 | EXT4_I(inode)->cur_aio_dio = iocb->private; | |
2822 | } | |
2823 | ||
aacfc19c | 2824 | ret = __blockdev_direct_IO(rw, iocb, inode, |
4c0425ff MC |
2825 | inode->i_sb->s_bdev, iov, |
2826 | offset, nr_segs, | |
c7064ef1 | 2827 | ext4_get_block_write, |
aacfc19c CH |
2828 | ext4_end_io_dio, |
2829 | NULL, | |
2830 | DIO_LOCKING | DIO_SKIP_HOLES); | |
8d5d02e6 MC |
2831 | if (iocb->private) |
2832 | EXT4_I(inode)->cur_aio_dio = NULL; | |
2833 | /* | |
2834 | * The io_end structure takes a reference to the inode, | |
2835 | * that structure needs to be destroyed and the | |
2836 | * reference to the inode need to be dropped, when IO is | |
2837 | * complete, even with 0 byte write, or failed. | |
2838 | * | |
2839 | * In the successful AIO DIO case, the io_end structure will be | |
2840 | * desctroyed and the reference to the inode will be dropped | |
2841 | * after the end_io call back function is called. | |
2842 | * | |
2843 | * In the case there is 0 byte write, or error case, since | |
2844 | * VFS direct IO won't invoke the end_io call back function, | |
2845 | * we need to free the end_io structure here. | |
2846 | */ | |
2847 | if (ret != -EIOCBQUEUED && ret <= 0 && iocb->private) { | |
2848 | ext4_free_io_end(iocb->private); | |
2849 | iocb->private = NULL; | |
19f5fb7a TT |
2850 | } else if (ret > 0 && ext4_test_inode_state(inode, |
2851 | EXT4_STATE_DIO_UNWRITTEN)) { | |
109f5565 | 2852 | int err; |
8d5d02e6 MC |
2853 | /* |
2854 | * for non AIO case, since the IO is already | |
25985edc | 2855 | * completed, we could do the conversion right here |
8d5d02e6 | 2856 | */ |
109f5565 M |
2857 | err = ext4_convert_unwritten_extents(inode, |
2858 | offset, ret); | |
2859 | if (err < 0) | |
2860 | ret = err; | |
19f5fb7a | 2861 | ext4_clear_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN); |
109f5565 | 2862 | } |
4c0425ff MC |
2863 | return ret; |
2864 | } | |
8d5d02e6 MC |
2865 | |
2866 | /* for write the the end of file case, we fall back to old way */ | |
4c0425ff MC |
2867 | return ext4_ind_direct_IO(rw, iocb, iov, offset, nr_segs); |
2868 | } | |
2869 | ||
2870 | static ssize_t ext4_direct_IO(int rw, struct kiocb *iocb, | |
2871 | const struct iovec *iov, loff_t offset, | |
2872 | unsigned long nr_segs) | |
2873 | { | |
2874 | struct file *file = iocb->ki_filp; | |
2875 | struct inode *inode = file->f_mapping->host; | |
0562e0ba | 2876 | ssize_t ret; |
4c0425ff | 2877 | |
84ebd795 TT |
2878 | /* |
2879 | * If we are doing data journalling we don't support O_DIRECT | |
2880 | */ | |
2881 | if (ext4_should_journal_data(inode)) | |
2882 | return 0; | |
2883 | ||
0562e0ba | 2884 | trace_ext4_direct_IO_enter(inode, offset, iov_length(iov, nr_segs), rw); |
12e9b892 | 2885 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
0562e0ba JZ |
2886 | ret = ext4_ext_direct_IO(rw, iocb, iov, offset, nr_segs); |
2887 | else | |
2888 | ret = ext4_ind_direct_IO(rw, iocb, iov, offset, nr_segs); | |
2889 | trace_ext4_direct_IO_exit(inode, offset, | |
2890 | iov_length(iov, nr_segs), rw, ret); | |
2891 | return ret; | |
4c0425ff MC |
2892 | } |
2893 | ||
ac27a0ec | 2894 | /* |
617ba13b | 2895 | * Pages can be marked dirty completely asynchronously from ext4's journalling |
ac27a0ec DK |
2896 | * activity. By filemap_sync_pte(), try_to_unmap_one(), etc. We cannot do |
2897 | * much here because ->set_page_dirty is called under VFS locks. The page is | |
2898 | * not necessarily locked. | |
2899 | * | |
2900 | * We cannot just dirty the page and leave attached buffers clean, because the | |
2901 | * buffers' dirty state is "definitive". We cannot just set the buffers dirty | |
2902 | * or jbddirty because all the journalling code will explode. | |
2903 | * | |
2904 | * So what we do is to mark the page "pending dirty" and next time writepage | |
2905 | * is called, propagate that into the buffers appropriately. | |
2906 | */ | |
617ba13b | 2907 | static int ext4_journalled_set_page_dirty(struct page *page) |
ac27a0ec DK |
2908 | { |
2909 | SetPageChecked(page); | |
2910 | return __set_page_dirty_nobuffers(page); | |
2911 | } | |
2912 | ||
617ba13b | 2913 | static const struct address_space_operations ext4_ordered_aops = { |
8ab22b9a HH |
2914 | .readpage = ext4_readpage, |
2915 | .readpages = ext4_readpages, | |
43ce1d23 | 2916 | .writepage = ext4_writepage, |
8ab22b9a HH |
2917 | .write_begin = ext4_write_begin, |
2918 | .write_end = ext4_ordered_write_end, | |
2919 | .bmap = ext4_bmap, | |
2920 | .invalidatepage = ext4_invalidatepage, | |
2921 | .releasepage = ext4_releasepage, | |
2922 | .direct_IO = ext4_direct_IO, | |
2923 | .migratepage = buffer_migrate_page, | |
2924 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 2925 | .error_remove_page = generic_error_remove_page, |
ac27a0ec DK |
2926 | }; |
2927 | ||
617ba13b | 2928 | static const struct address_space_operations ext4_writeback_aops = { |
8ab22b9a HH |
2929 | .readpage = ext4_readpage, |
2930 | .readpages = ext4_readpages, | |
43ce1d23 | 2931 | .writepage = ext4_writepage, |
8ab22b9a HH |
2932 | .write_begin = ext4_write_begin, |
2933 | .write_end = ext4_writeback_write_end, | |
2934 | .bmap = ext4_bmap, | |
2935 | .invalidatepage = ext4_invalidatepage, | |
2936 | .releasepage = ext4_releasepage, | |
2937 | .direct_IO = ext4_direct_IO, | |
2938 | .migratepage = buffer_migrate_page, | |
2939 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 2940 | .error_remove_page = generic_error_remove_page, |
ac27a0ec DK |
2941 | }; |
2942 | ||
617ba13b | 2943 | static const struct address_space_operations ext4_journalled_aops = { |
8ab22b9a HH |
2944 | .readpage = ext4_readpage, |
2945 | .readpages = ext4_readpages, | |
43ce1d23 | 2946 | .writepage = ext4_writepage, |
8ab22b9a HH |
2947 | .write_begin = ext4_write_begin, |
2948 | .write_end = ext4_journalled_write_end, | |
2949 | .set_page_dirty = ext4_journalled_set_page_dirty, | |
2950 | .bmap = ext4_bmap, | |
2951 | .invalidatepage = ext4_invalidatepage, | |
2952 | .releasepage = ext4_releasepage, | |
84ebd795 | 2953 | .direct_IO = ext4_direct_IO, |
8ab22b9a | 2954 | .is_partially_uptodate = block_is_partially_uptodate, |
aa261f54 | 2955 | .error_remove_page = generic_error_remove_page, |
ac27a0ec DK |
2956 | }; |
2957 | ||
64769240 | 2958 | static const struct address_space_operations ext4_da_aops = { |
8ab22b9a HH |
2959 | .readpage = ext4_readpage, |
2960 | .readpages = ext4_readpages, | |
43ce1d23 | 2961 | .writepage = ext4_writepage, |
8ab22b9a | 2962 | .writepages = ext4_da_writepages, |
8ab22b9a HH |
2963 | .write_begin = ext4_da_write_begin, |
2964 | .write_end = ext4_da_write_end, | |
2965 | .bmap = ext4_bmap, | |
2966 | .invalidatepage = ext4_da_invalidatepage, | |
2967 | .releasepage = ext4_releasepage, | |
2968 | .direct_IO = ext4_direct_IO, | |
2969 | .migratepage = buffer_migrate_page, | |
2970 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 2971 | .error_remove_page = generic_error_remove_page, |
64769240 AT |
2972 | }; |
2973 | ||
617ba13b | 2974 | void ext4_set_aops(struct inode *inode) |
ac27a0ec | 2975 | { |
cd1aac32 AK |
2976 | if (ext4_should_order_data(inode) && |
2977 | test_opt(inode->i_sb, DELALLOC)) | |
2978 | inode->i_mapping->a_ops = &ext4_da_aops; | |
2979 | else if (ext4_should_order_data(inode)) | |
617ba13b | 2980 | inode->i_mapping->a_ops = &ext4_ordered_aops; |
64769240 AT |
2981 | else if (ext4_should_writeback_data(inode) && |
2982 | test_opt(inode->i_sb, DELALLOC)) | |
2983 | inode->i_mapping->a_ops = &ext4_da_aops; | |
617ba13b MC |
2984 | else if (ext4_should_writeback_data(inode)) |
2985 | inode->i_mapping->a_ops = &ext4_writeback_aops; | |
ac27a0ec | 2986 | else |
617ba13b | 2987 | inode->i_mapping->a_ops = &ext4_journalled_aops; |
ac27a0ec DK |
2988 | } |
2989 | ||
4e96b2db AH |
2990 | |
2991 | /* | |
2992 | * ext4_discard_partial_page_buffers() | |
2993 | * Wrapper function for ext4_discard_partial_page_buffers_no_lock. | |
2994 | * This function finds and locks the page containing the offset | |
2995 | * "from" and passes it to ext4_discard_partial_page_buffers_no_lock. | |
2996 | * Calling functions that already have the page locked should call | |
2997 | * ext4_discard_partial_page_buffers_no_lock directly. | |
2998 | */ | |
2999 | int ext4_discard_partial_page_buffers(handle_t *handle, | |
3000 | struct address_space *mapping, loff_t from, | |
3001 | loff_t length, int flags) | |
3002 | { | |
3003 | struct inode *inode = mapping->host; | |
3004 | struct page *page; | |
3005 | int err = 0; | |
3006 | ||
3007 | page = find_or_create_page(mapping, from >> PAGE_CACHE_SHIFT, | |
3008 | mapping_gfp_mask(mapping) & ~__GFP_FS); | |
3009 | if (!page) | |
3010 | return -EINVAL; | |
3011 | ||
3012 | err = ext4_discard_partial_page_buffers_no_lock(handle, inode, page, | |
3013 | from, length, flags); | |
3014 | ||
3015 | unlock_page(page); | |
3016 | page_cache_release(page); | |
3017 | return err; | |
3018 | } | |
3019 | ||
3020 | /* | |
3021 | * ext4_discard_partial_page_buffers_no_lock() | |
3022 | * Zeros a page range of length 'length' starting from offset 'from'. | |
3023 | * Buffer heads that correspond to the block aligned regions of the | |
3024 | * zeroed range will be unmapped. Unblock aligned regions | |
3025 | * will have the corresponding buffer head mapped if needed so that | |
3026 | * that region of the page can be updated with the partial zero out. | |
3027 | * | |
3028 | * This function assumes that the page has already been locked. The | |
3029 | * The range to be discarded must be contained with in the given page. | |
3030 | * If the specified range exceeds the end of the page it will be shortened | |
3031 | * to the end of the page that corresponds to 'from'. This function is | |
3032 | * appropriate for updating a page and it buffer heads to be unmapped and | |
3033 | * zeroed for blocks that have been either released, or are going to be | |
3034 | * released. | |
3035 | * | |
3036 | * handle: The journal handle | |
3037 | * inode: The files inode | |
3038 | * page: A locked page that contains the offset "from" | |
3039 | * from: The starting byte offset (from the begining of the file) | |
3040 | * to begin discarding | |
3041 | * len: The length of bytes to discard | |
3042 | * flags: Optional flags that may be used: | |
3043 | * | |
3044 | * EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED | |
3045 | * Only zero the regions of the page whose buffer heads | |
3046 | * have already been unmapped. This flag is appropriate | |
3047 | * for updateing the contents of a page whose blocks may | |
3048 | * have already been released, and we only want to zero | |
3049 | * out the regions that correspond to those released blocks. | |
3050 | * | |
3051 | * Returns zero on sucess or negative on failure. | |
3052 | */ | |
3053 | int ext4_discard_partial_page_buffers_no_lock(handle_t *handle, | |
3054 | struct inode *inode, struct page *page, loff_t from, | |
3055 | loff_t length, int flags) | |
3056 | { | |
3057 | ext4_fsblk_t index = from >> PAGE_CACHE_SHIFT; | |
3058 | unsigned int offset = from & (PAGE_CACHE_SIZE-1); | |
3059 | unsigned int blocksize, max, pos; | |
3060 | unsigned int end_of_block, range_to_discard; | |
3061 | ext4_lblk_t iblock; | |
3062 | struct buffer_head *bh; | |
3063 | int err = 0; | |
3064 | ||
3065 | blocksize = inode->i_sb->s_blocksize; | |
3066 | max = PAGE_CACHE_SIZE - offset; | |
3067 | ||
3068 | if (index != page->index) | |
3069 | return -EINVAL; | |
3070 | ||
3071 | /* | |
3072 | * correct length if it does not fall between | |
3073 | * 'from' and the end of the page | |
3074 | */ | |
3075 | if (length > max || length < 0) | |
3076 | length = max; | |
3077 | ||
3078 | iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); | |
3079 | ||
3080 | if (!page_has_buffers(page)) { | |
3081 | /* | |
3082 | * If the range to be discarded covers a partial block | |
3083 | * we need to get the page buffers. This is because | |
3084 | * partial blocks cannot be released and the page needs | |
3085 | * to be updated with the contents of the block before | |
3086 | * we write the zeros on top of it. | |
3087 | */ | |
3088 | if (!(from & (blocksize - 1)) || | |
3089 | !((from + length) & (blocksize - 1))) { | |
3090 | create_empty_buffers(page, blocksize, 0); | |
3091 | } else { | |
3092 | /* | |
3093 | * If there are no partial blocks, | |
3094 | * there is nothing to update, | |
3095 | * so we can return now | |
3096 | */ | |
3097 | return 0; | |
3098 | } | |
3099 | } | |
3100 | ||
3101 | /* Find the buffer that contains "offset" */ | |
3102 | bh = page_buffers(page); | |
3103 | pos = blocksize; | |
3104 | while (offset >= pos) { | |
3105 | bh = bh->b_this_page; | |
3106 | iblock++; | |
3107 | pos += blocksize; | |
3108 | } | |
3109 | ||
3110 | pos = offset; | |
3111 | while (pos < offset + length) { | |
3112 | err = 0; | |
3113 | ||
3114 | /* The length of space left to zero and unmap */ | |
3115 | range_to_discard = offset + length - pos; | |
3116 | ||
3117 | /* The length of space until the end of the block */ | |
3118 | end_of_block = blocksize - (pos & (blocksize-1)); | |
3119 | ||
3120 | /* | |
3121 | * Do not unmap or zero past end of block | |
3122 | * for this buffer head | |
3123 | */ | |
3124 | if (range_to_discard > end_of_block) | |
3125 | range_to_discard = end_of_block; | |
3126 | ||
3127 | ||
3128 | /* | |
3129 | * Skip this buffer head if we are only zeroing unampped | |
3130 | * regions of the page | |
3131 | */ | |
3132 | if (flags & EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED && | |
3133 | buffer_mapped(bh)) | |
3134 | goto next; | |
3135 | ||
3136 | /* If the range is block aligned, unmap */ | |
3137 | if (range_to_discard == blocksize) { | |
3138 | clear_buffer_dirty(bh); | |
3139 | bh->b_bdev = NULL; | |
3140 | clear_buffer_mapped(bh); | |
3141 | clear_buffer_req(bh); | |
3142 | clear_buffer_new(bh); | |
3143 | clear_buffer_delay(bh); | |
3144 | clear_buffer_unwritten(bh); | |
3145 | clear_buffer_uptodate(bh); | |
3146 | zero_user(page, pos, range_to_discard); | |
3147 | BUFFER_TRACE(bh, "Buffer discarded"); | |
3148 | goto next; | |
3149 | } | |
3150 | ||
3151 | /* | |
3152 | * If this block is not completely contained in the range | |
3153 | * to be discarded, then it is not going to be released. Because | |
3154 | * we need to keep this block, we need to make sure this part | |
3155 | * of the page is uptodate before we modify it by writeing | |
3156 | * partial zeros on it. | |
3157 | */ | |
3158 | if (!buffer_mapped(bh)) { | |
3159 | /* | |
3160 | * Buffer head must be mapped before we can read | |
3161 | * from the block | |
3162 | */ | |
3163 | BUFFER_TRACE(bh, "unmapped"); | |
3164 | ext4_get_block(inode, iblock, bh, 0); | |
3165 | /* unmapped? It's a hole - nothing to do */ | |
3166 | if (!buffer_mapped(bh)) { | |
3167 | BUFFER_TRACE(bh, "still unmapped"); | |
3168 | goto next; | |
3169 | } | |
3170 | } | |
3171 | ||
3172 | /* Ok, it's mapped. Make sure it's up-to-date */ | |
3173 | if (PageUptodate(page)) | |
3174 | set_buffer_uptodate(bh); | |
3175 | ||
3176 | if (!buffer_uptodate(bh)) { | |
3177 | err = -EIO; | |
3178 | ll_rw_block(READ, 1, &bh); | |
3179 | wait_on_buffer(bh); | |
3180 | /* Uhhuh. Read error. Complain and punt.*/ | |
3181 | if (!buffer_uptodate(bh)) | |
3182 | goto next; | |
3183 | } | |
3184 | ||
3185 | if (ext4_should_journal_data(inode)) { | |
3186 | BUFFER_TRACE(bh, "get write access"); | |
3187 | err = ext4_journal_get_write_access(handle, bh); | |
3188 | if (err) | |
3189 | goto next; | |
3190 | } | |
3191 | ||
3192 | zero_user(page, pos, range_to_discard); | |
3193 | ||
3194 | err = 0; | |
3195 | if (ext4_should_journal_data(inode)) { | |
3196 | err = ext4_handle_dirty_metadata(handle, inode, bh); | |
decbd919 | 3197 | } else |
4e96b2db | 3198 | mark_buffer_dirty(bh); |
4e96b2db AH |
3199 | |
3200 | BUFFER_TRACE(bh, "Partial buffer zeroed"); | |
3201 | next: | |
3202 | bh = bh->b_this_page; | |
3203 | iblock++; | |
3204 | pos += range_to_discard; | |
3205 | } | |
3206 | ||
3207 | return err; | |
3208 | } | |
3209 | ||
ac27a0ec | 3210 | /* |
617ba13b | 3211 | * ext4_block_truncate_page() zeroes out a mapping from file offset `from' |
ac27a0ec DK |
3212 | * up to the end of the block which corresponds to `from'. |
3213 | * This required during truncate. We need to physically zero the tail end | |
3214 | * of that block so it doesn't yield old data if the file is later grown. | |
3215 | */ | |
cf108bca | 3216 | int ext4_block_truncate_page(handle_t *handle, |
ac27a0ec | 3217 | struct address_space *mapping, loff_t from) |
30848851 AH |
3218 | { |
3219 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
3220 | unsigned length; | |
3221 | unsigned blocksize; | |
3222 | struct inode *inode = mapping->host; | |
3223 | ||
3224 | blocksize = inode->i_sb->s_blocksize; | |
3225 | length = blocksize - (offset & (blocksize - 1)); | |
3226 | ||
3227 | return ext4_block_zero_page_range(handle, mapping, from, length); | |
3228 | } | |
3229 | ||
3230 | /* | |
3231 | * ext4_block_zero_page_range() zeros out a mapping of length 'length' | |
3232 | * starting from file offset 'from'. The range to be zero'd must | |
3233 | * be contained with in one block. If the specified range exceeds | |
3234 | * the end of the block it will be shortened to end of the block | |
3235 | * that cooresponds to 'from' | |
3236 | */ | |
3237 | int ext4_block_zero_page_range(handle_t *handle, | |
3238 | struct address_space *mapping, loff_t from, loff_t length) | |
ac27a0ec | 3239 | { |
617ba13b | 3240 | ext4_fsblk_t index = from >> PAGE_CACHE_SHIFT; |
ac27a0ec | 3241 | unsigned offset = from & (PAGE_CACHE_SIZE-1); |
30848851 | 3242 | unsigned blocksize, max, pos; |
725d26d3 | 3243 | ext4_lblk_t iblock; |
ac27a0ec DK |
3244 | struct inode *inode = mapping->host; |
3245 | struct buffer_head *bh; | |
cf108bca | 3246 | struct page *page; |
ac27a0ec | 3247 | int err = 0; |
ac27a0ec | 3248 | |
f4a01017 TT |
3249 | page = find_or_create_page(mapping, from >> PAGE_CACHE_SHIFT, |
3250 | mapping_gfp_mask(mapping) & ~__GFP_FS); | |
cf108bca JK |
3251 | if (!page) |
3252 | return -EINVAL; | |
3253 | ||
ac27a0ec | 3254 | blocksize = inode->i_sb->s_blocksize; |
30848851 AH |
3255 | max = blocksize - (offset & (blocksize - 1)); |
3256 | ||
3257 | /* | |
3258 | * correct length if it does not fall between | |
3259 | * 'from' and the end of the block | |
3260 | */ | |
3261 | if (length > max || length < 0) | |
3262 | length = max; | |
3263 | ||
ac27a0ec DK |
3264 | iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); |
3265 | ||
ac27a0ec DK |
3266 | if (!page_has_buffers(page)) |
3267 | create_empty_buffers(page, blocksize, 0); | |
3268 | ||
3269 | /* Find the buffer that contains "offset" */ | |
3270 | bh = page_buffers(page); | |
3271 | pos = blocksize; | |
3272 | while (offset >= pos) { | |
3273 | bh = bh->b_this_page; | |
3274 | iblock++; | |
3275 | pos += blocksize; | |
3276 | } | |
3277 | ||
3278 | err = 0; | |
3279 | if (buffer_freed(bh)) { | |
3280 | BUFFER_TRACE(bh, "freed: skip"); | |
3281 | goto unlock; | |
3282 | } | |
3283 | ||
3284 | if (!buffer_mapped(bh)) { | |
3285 | BUFFER_TRACE(bh, "unmapped"); | |
617ba13b | 3286 | ext4_get_block(inode, iblock, bh, 0); |
ac27a0ec DK |
3287 | /* unmapped? It's a hole - nothing to do */ |
3288 | if (!buffer_mapped(bh)) { | |
3289 | BUFFER_TRACE(bh, "still unmapped"); | |
3290 | goto unlock; | |
3291 | } | |
3292 | } | |
3293 | ||
3294 | /* Ok, it's mapped. Make sure it's up-to-date */ | |
3295 | if (PageUptodate(page)) | |
3296 | set_buffer_uptodate(bh); | |
3297 | ||
3298 | if (!buffer_uptodate(bh)) { | |
3299 | err = -EIO; | |
3300 | ll_rw_block(READ, 1, &bh); | |
3301 | wait_on_buffer(bh); | |
3302 | /* Uhhuh. Read error. Complain and punt. */ | |
3303 | if (!buffer_uptodate(bh)) | |
3304 | goto unlock; | |
3305 | } | |
3306 | ||
617ba13b | 3307 | if (ext4_should_journal_data(inode)) { |
ac27a0ec | 3308 | BUFFER_TRACE(bh, "get write access"); |
617ba13b | 3309 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec DK |
3310 | if (err) |
3311 | goto unlock; | |
3312 | } | |
3313 | ||
eebd2aa3 | 3314 | zero_user(page, offset, length); |
ac27a0ec DK |
3315 | |
3316 | BUFFER_TRACE(bh, "zeroed end of block"); | |
3317 | ||
3318 | err = 0; | |
617ba13b | 3319 | if (ext4_should_journal_data(inode)) { |
0390131b | 3320 | err = ext4_handle_dirty_metadata(handle, inode, bh); |
decbd919 | 3321 | } else |
ac27a0ec | 3322 | mark_buffer_dirty(bh); |
ac27a0ec DK |
3323 | |
3324 | unlock: | |
3325 | unlock_page(page); | |
3326 | page_cache_release(page); | |
3327 | return err; | |
3328 | } | |
3329 | ||
91ef4caf DG |
3330 | int ext4_can_truncate(struct inode *inode) |
3331 | { | |
91ef4caf DG |
3332 | if (S_ISREG(inode->i_mode)) |
3333 | return 1; | |
3334 | if (S_ISDIR(inode->i_mode)) | |
3335 | return 1; | |
3336 | if (S_ISLNK(inode->i_mode)) | |
3337 | return !ext4_inode_is_fast_symlink(inode); | |
3338 | return 0; | |
3339 | } | |
3340 | ||
a4bb6b64 AH |
3341 | /* |
3342 | * ext4_punch_hole: punches a hole in a file by releaseing the blocks | |
3343 | * associated with the given offset and length | |
3344 | * | |
3345 | * @inode: File inode | |
3346 | * @offset: The offset where the hole will begin | |
3347 | * @len: The length of the hole | |
3348 | * | |
3349 | * Returns: 0 on sucess or negative on failure | |
3350 | */ | |
3351 | ||
3352 | int ext4_punch_hole(struct file *file, loff_t offset, loff_t length) | |
3353 | { | |
3354 | struct inode *inode = file->f_path.dentry->d_inode; | |
3355 | if (!S_ISREG(inode->i_mode)) | |
3356 | return -ENOTSUPP; | |
3357 | ||
3358 | if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { | |
3359 | /* TODO: Add support for non extent hole punching */ | |
3360 | return -ENOTSUPP; | |
3361 | } | |
3362 | ||
bab08ab9 TT |
3363 | if (EXT4_SB(inode->i_sb)->s_cluster_ratio > 1) { |
3364 | /* TODO: Add support for bigalloc file systems */ | |
3365 | return -ENOTSUPP; | |
3366 | } | |
3367 | ||
a4bb6b64 AH |
3368 | return ext4_ext_punch_hole(file, offset, length); |
3369 | } | |
3370 | ||
ac27a0ec | 3371 | /* |
617ba13b | 3372 | * ext4_truncate() |
ac27a0ec | 3373 | * |
617ba13b MC |
3374 | * We block out ext4_get_block() block instantiations across the entire |
3375 | * transaction, and VFS/VM ensures that ext4_truncate() cannot run | |
ac27a0ec DK |
3376 | * simultaneously on behalf of the same inode. |
3377 | * | |
3378 | * As we work through the truncate and commmit bits of it to the journal there | |
3379 | * is one core, guiding principle: the file's tree must always be consistent on | |
3380 | * disk. We must be able to restart the truncate after a crash. | |
3381 | * | |
3382 | * The file's tree may be transiently inconsistent in memory (although it | |
3383 | * probably isn't), but whenever we close off and commit a journal transaction, | |
3384 | * the contents of (the filesystem + the journal) must be consistent and | |
3385 | * restartable. It's pretty simple, really: bottom up, right to left (although | |
3386 | * left-to-right works OK too). | |
3387 | * | |
3388 | * Note that at recovery time, journal replay occurs *before* the restart of | |
3389 | * truncate against the orphan inode list. | |
3390 | * | |
3391 | * The committed inode has the new, desired i_size (which is the same as | |
617ba13b | 3392 | * i_disksize in this case). After a crash, ext4_orphan_cleanup() will see |
ac27a0ec | 3393 | * that this inode's truncate did not complete and it will again call |
617ba13b MC |
3394 | * ext4_truncate() to have another go. So there will be instantiated blocks |
3395 | * to the right of the truncation point in a crashed ext4 filesystem. But | |
ac27a0ec | 3396 | * that's fine - as long as they are linked from the inode, the post-crash |
617ba13b | 3397 | * ext4_truncate() run will find them and release them. |
ac27a0ec | 3398 | */ |
617ba13b | 3399 | void ext4_truncate(struct inode *inode) |
ac27a0ec | 3400 | { |
0562e0ba JZ |
3401 | trace_ext4_truncate_enter(inode); |
3402 | ||
91ef4caf | 3403 | if (!ext4_can_truncate(inode)) |
ac27a0ec DK |
3404 | return; |
3405 | ||
12e9b892 | 3406 | ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS); |
c8d46e41 | 3407 | |
5534fb5b | 3408 | if (inode->i_size == 0 && !test_opt(inode->i_sb, NO_AUTO_DA_ALLOC)) |
19f5fb7a | 3409 | ext4_set_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE); |
7d8f9f7d | 3410 | |
ff9893dc | 3411 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
cf108bca | 3412 | ext4_ext_truncate(inode); |
ff9893dc AG |
3413 | else |
3414 | ext4_ind_truncate(inode); | |
ac27a0ec | 3415 | |
0562e0ba | 3416 | trace_ext4_truncate_exit(inode); |
ac27a0ec DK |
3417 | } |
3418 | ||
ac27a0ec | 3419 | /* |
617ba13b | 3420 | * ext4_get_inode_loc returns with an extra refcount against the inode's |
ac27a0ec DK |
3421 | * underlying buffer_head on success. If 'in_mem' is true, we have all |
3422 | * data in memory that is needed to recreate the on-disk version of this | |
3423 | * inode. | |
3424 | */ | |
617ba13b MC |
3425 | static int __ext4_get_inode_loc(struct inode *inode, |
3426 | struct ext4_iloc *iloc, int in_mem) | |
ac27a0ec | 3427 | { |
240799cd TT |
3428 | struct ext4_group_desc *gdp; |
3429 | struct buffer_head *bh; | |
3430 | struct super_block *sb = inode->i_sb; | |
3431 | ext4_fsblk_t block; | |
3432 | int inodes_per_block, inode_offset; | |
3433 | ||
3a06d778 | 3434 | iloc->bh = NULL; |
240799cd TT |
3435 | if (!ext4_valid_inum(sb, inode->i_ino)) |
3436 | return -EIO; | |
ac27a0ec | 3437 | |
240799cd TT |
3438 | iloc->block_group = (inode->i_ino - 1) / EXT4_INODES_PER_GROUP(sb); |
3439 | gdp = ext4_get_group_desc(sb, iloc->block_group, NULL); | |
3440 | if (!gdp) | |
ac27a0ec DK |
3441 | return -EIO; |
3442 | ||
240799cd TT |
3443 | /* |
3444 | * Figure out the offset within the block group inode table | |
3445 | */ | |
00d09882 | 3446 | inodes_per_block = EXT4_SB(sb)->s_inodes_per_block; |
240799cd TT |
3447 | inode_offset = ((inode->i_ino - 1) % |
3448 | EXT4_INODES_PER_GROUP(sb)); | |
3449 | block = ext4_inode_table(sb, gdp) + (inode_offset / inodes_per_block); | |
3450 | iloc->offset = (inode_offset % inodes_per_block) * EXT4_INODE_SIZE(sb); | |
3451 | ||
3452 | bh = sb_getblk(sb, block); | |
ac27a0ec | 3453 | if (!bh) { |
c398eda0 TT |
3454 | EXT4_ERROR_INODE_BLOCK(inode, block, |
3455 | "unable to read itable block"); | |
ac27a0ec DK |
3456 | return -EIO; |
3457 | } | |
3458 | if (!buffer_uptodate(bh)) { | |
3459 | lock_buffer(bh); | |
9c83a923 HK |
3460 | |
3461 | /* | |
3462 | * If the buffer has the write error flag, we have failed | |
3463 | * to write out another inode in the same block. In this | |
3464 | * case, we don't have to read the block because we may | |
3465 | * read the old inode data successfully. | |
3466 | */ | |
3467 | if (buffer_write_io_error(bh) && !buffer_uptodate(bh)) | |
3468 | set_buffer_uptodate(bh); | |
3469 | ||
ac27a0ec DK |
3470 | if (buffer_uptodate(bh)) { |
3471 | /* someone brought it uptodate while we waited */ | |
3472 | unlock_buffer(bh); | |
3473 | goto has_buffer; | |
3474 | } | |
3475 | ||
3476 | /* | |
3477 | * If we have all information of the inode in memory and this | |
3478 | * is the only valid inode in the block, we need not read the | |
3479 | * block. | |
3480 | */ | |
3481 | if (in_mem) { | |
3482 | struct buffer_head *bitmap_bh; | |
240799cd | 3483 | int i, start; |
ac27a0ec | 3484 | |
240799cd | 3485 | start = inode_offset & ~(inodes_per_block - 1); |
ac27a0ec | 3486 | |
240799cd TT |
3487 | /* Is the inode bitmap in cache? */ |
3488 | bitmap_bh = sb_getblk(sb, ext4_inode_bitmap(sb, gdp)); | |
ac27a0ec DK |
3489 | if (!bitmap_bh) |
3490 | goto make_io; | |
3491 | ||
3492 | /* | |
3493 | * If the inode bitmap isn't in cache then the | |
3494 | * optimisation may end up performing two reads instead | |
3495 | * of one, so skip it. | |
3496 | */ | |
3497 | if (!buffer_uptodate(bitmap_bh)) { | |
3498 | brelse(bitmap_bh); | |
3499 | goto make_io; | |
3500 | } | |
240799cd | 3501 | for (i = start; i < start + inodes_per_block; i++) { |
ac27a0ec DK |
3502 | if (i == inode_offset) |
3503 | continue; | |
617ba13b | 3504 | if (ext4_test_bit(i, bitmap_bh->b_data)) |
ac27a0ec DK |
3505 | break; |
3506 | } | |
3507 | brelse(bitmap_bh); | |
240799cd | 3508 | if (i == start + inodes_per_block) { |
ac27a0ec DK |
3509 | /* all other inodes are free, so skip I/O */ |
3510 | memset(bh->b_data, 0, bh->b_size); | |
3511 | set_buffer_uptodate(bh); | |
3512 | unlock_buffer(bh); | |
3513 | goto has_buffer; | |
3514 | } | |
3515 | } | |
3516 | ||
3517 | make_io: | |
240799cd TT |
3518 | /* |
3519 | * If we need to do any I/O, try to pre-readahead extra | |
3520 | * blocks from the inode table. | |
3521 | */ | |
3522 | if (EXT4_SB(sb)->s_inode_readahead_blks) { | |
3523 | ext4_fsblk_t b, end, table; | |
3524 | unsigned num; | |
3525 | ||
3526 | table = ext4_inode_table(sb, gdp); | |
b713a5ec | 3527 | /* s_inode_readahead_blks is always a power of 2 */ |
240799cd TT |
3528 | b = block & ~(EXT4_SB(sb)->s_inode_readahead_blks-1); |
3529 | if (table > b) | |
3530 | b = table; | |
3531 | end = b + EXT4_SB(sb)->s_inode_readahead_blks; | |
3532 | num = EXT4_INODES_PER_GROUP(sb); | |
3533 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
3534 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) | |
560671a0 | 3535 | num -= ext4_itable_unused_count(sb, gdp); |
240799cd TT |
3536 | table += num / inodes_per_block; |
3537 | if (end > table) | |
3538 | end = table; | |
3539 | while (b <= end) | |
3540 | sb_breadahead(sb, b++); | |
3541 | } | |
3542 | ||
ac27a0ec DK |
3543 | /* |
3544 | * There are other valid inodes in the buffer, this inode | |
3545 | * has in-inode xattrs, or we don't have this inode in memory. | |
3546 | * Read the block from disk. | |
3547 | */ | |
0562e0ba | 3548 | trace_ext4_load_inode(inode); |
ac27a0ec DK |
3549 | get_bh(bh); |
3550 | bh->b_end_io = end_buffer_read_sync; | |
3551 | submit_bh(READ_META, bh); | |
3552 | wait_on_buffer(bh); | |
3553 | if (!buffer_uptodate(bh)) { | |
c398eda0 TT |
3554 | EXT4_ERROR_INODE_BLOCK(inode, block, |
3555 | "unable to read itable block"); | |
ac27a0ec DK |
3556 | brelse(bh); |
3557 | return -EIO; | |
3558 | } | |
3559 | } | |
3560 | has_buffer: | |
3561 | iloc->bh = bh; | |
3562 | return 0; | |
3563 | } | |
3564 | ||
617ba13b | 3565 | int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc) |
ac27a0ec DK |
3566 | { |
3567 | /* We have all inode data except xattrs in memory here. */ | |
617ba13b | 3568 | return __ext4_get_inode_loc(inode, iloc, |
19f5fb7a | 3569 | !ext4_test_inode_state(inode, EXT4_STATE_XATTR)); |
ac27a0ec DK |
3570 | } |
3571 | ||
617ba13b | 3572 | void ext4_set_inode_flags(struct inode *inode) |
ac27a0ec | 3573 | { |
617ba13b | 3574 | unsigned int flags = EXT4_I(inode)->i_flags; |
ac27a0ec DK |
3575 | |
3576 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
617ba13b | 3577 | if (flags & EXT4_SYNC_FL) |
ac27a0ec | 3578 | inode->i_flags |= S_SYNC; |
617ba13b | 3579 | if (flags & EXT4_APPEND_FL) |
ac27a0ec | 3580 | inode->i_flags |= S_APPEND; |
617ba13b | 3581 | if (flags & EXT4_IMMUTABLE_FL) |
ac27a0ec | 3582 | inode->i_flags |= S_IMMUTABLE; |
617ba13b | 3583 | if (flags & EXT4_NOATIME_FL) |
ac27a0ec | 3584 | inode->i_flags |= S_NOATIME; |
617ba13b | 3585 | if (flags & EXT4_DIRSYNC_FL) |
ac27a0ec DK |
3586 | inode->i_flags |= S_DIRSYNC; |
3587 | } | |
3588 | ||
ff9ddf7e JK |
3589 | /* Propagate flags from i_flags to EXT4_I(inode)->i_flags */ |
3590 | void ext4_get_inode_flags(struct ext4_inode_info *ei) | |
3591 | { | |
84a8dce2 DM |
3592 | unsigned int vfs_fl; |
3593 | unsigned long old_fl, new_fl; | |
3594 | ||
3595 | do { | |
3596 | vfs_fl = ei->vfs_inode.i_flags; | |
3597 | old_fl = ei->i_flags; | |
3598 | new_fl = old_fl & ~(EXT4_SYNC_FL|EXT4_APPEND_FL| | |
3599 | EXT4_IMMUTABLE_FL|EXT4_NOATIME_FL| | |
3600 | EXT4_DIRSYNC_FL); | |
3601 | if (vfs_fl & S_SYNC) | |
3602 | new_fl |= EXT4_SYNC_FL; | |
3603 | if (vfs_fl & S_APPEND) | |
3604 | new_fl |= EXT4_APPEND_FL; | |
3605 | if (vfs_fl & S_IMMUTABLE) | |
3606 | new_fl |= EXT4_IMMUTABLE_FL; | |
3607 | if (vfs_fl & S_NOATIME) | |
3608 | new_fl |= EXT4_NOATIME_FL; | |
3609 | if (vfs_fl & S_DIRSYNC) | |
3610 | new_fl |= EXT4_DIRSYNC_FL; | |
3611 | } while (cmpxchg(&ei->i_flags, old_fl, new_fl) != old_fl); | |
ff9ddf7e | 3612 | } |
de9a55b8 | 3613 | |
0fc1b451 | 3614 | static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode, |
de9a55b8 | 3615 | struct ext4_inode_info *ei) |
0fc1b451 AK |
3616 | { |
3617 | blkcnt_t i_blocks ; | |
8180a562 AK |
3618 | struct inode *inode = &(ei->vfs_inode); |
3619 | struct super_block *sb = inode->i_sb; | |
0fc1b451 AK |
3620 | |
3621 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
3622 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { | |
3623 | /* we are using combined 48 bit field */ | |
3624 | i_blocks = ((u64)le16_to_cpu(raw_inode->i_blocks_high)) << 32 | | |
3625 | le32_to_cpu(raw_inode->i_blocks_lo); | |
07a03824 | 3626 | if (ext4_test_inode_flag(inode, EXT4_INODE_HUGE_FILE)) { |
8180a562 AK |
3627 | /* i_blocks represent file system block size */ |
3628 | return i_blocks << (inode->i_blkbits - 9); | |
3629 | } else { | |
3630 | return i_blocks; | |
3631 | } | |
0fc1b451 AK |
3632 | } else { |
3633 | return le32_to_cpu(raw_inode->i_blocks_lo); | |
3634 | } | |
3635 | } | |
ff9ddf7e | 3636 | |
1d1fe1ee | 3637 | struct inode *ext4_iget(struct super_block *sb, unsigned long ino) |
ac27a0ec | 3638 | { |
617ba13b MC |
3639 | struct ext4_iloc iloc; |
3640 | struct ext4_inode *raw_inode; | |
1d1fe1ee | 3641 | struct ext4_inode_info *ei; |
1d1fe1ee | 3642 | struct inode *inode; |
b436b9be | 3643 | journal_t *journal = EXT4_SB(sb)->s_journal; |
1d1fe1ee | 3644 | long ret; |
ac27a0ec DK |
3645 | int block; |
3646 | ||
1d1fe1ee DH |
3647 | inode = iget_locked(sb, ino); |
3648 | if (!inode) | |
3649 | return ERR_PTR(-ENOMEM); | |
3650 | if (!(inode->i_state & I_NEW)) | |
3651 | return inode; | |
3652 | ||
3653 | ei = EXT4_I(inode); | |
7dc57615 | 3654 | iloc.bh = NULL; |
ac27a0ec | 3655 | |
1d1fe1ee DH |
3656 | ret = __ext4_get_inode_loc(inode, &iloc, 0); |
3657 | if (ret < 0) | |
ac27a0ec | 3658 | goto bad_inode; |
617ba13b | 3659 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec DK |
3660 | inode->i_mode = le16_to_cpu(raw_inode->i_mode); |
3661 | inode->i_uid = (uid_t)le16_to_cpu(raw_inode->i_uid_low); | |
3662 | inode->i_gid = (gid_t)le16_to_cpu(raw_inode->i_gid_low); | |
af5bc92d | 3663 | if (!(test_opt(inode->i_sb, NO_UID32))) { |
ac27a0ec DK |
3664 | inode->i_uid |= le16_to_cpu(raw_inode->i_uid_high) << 16; |
3665 | inode->i_gid |= le16_to_cpu(raw_inode->i_gid_high) << 16; | |
3666 | } | |
3667 | inode->i_nlink = le16_to_cpu(raw_inode->i_links_count); | |
ac27a0ec | 3668 | |
353eb83c | 3669 | ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */ |
ac27a0ec DK |
3670 | ei->i_dir_start_lookup = 0; |
3671 | ei->i_dtime = le32_to_cpu(raw_inode->i_dtime); | |
3672 | /* We now have enough fields to check if the inode was active or not. | |
3673 | * This is needed because nfsd might try to access dead inodes | |
3674 | * the test is that same one that e2fsck uses | |
3675 | * NeilBrown 1999oct15 | |
3676 | */ | |
3677 | if (inode->i_nlink == 0) { | |
3678 | if (inode->i_mode == 0 || | |
617ba13b | 3679 | !(EXT4_SB(inode->i_sb)->s_mount_state & EXT4_ORPHAN_FS)) { |
ac27a0ec | 3680 | /* this inode is deleted */ |
1d1fe1ee | 3681 | ret = -ESTALE; |
ac27a0ec DK |
3682 | goto bad_inode; |
3683 | } | |
3684 | /* The only unlinked inodes we let through here have | |
3685 | * valid i_mode and are being read by the orphan | |
3686 | * recovery code: that's fine, we're about to complete | |
3687 | * the process of deleting those. */ | |
3688 | } | |
ac27a0ec | 3689 | ei->i_flags = le32_to_cpu(raw_inode->i_flags); |
0fc1b451 | 3690 | inode->i_blocks = ext4_inode_blocks(raw_inode, ei); |
7973c0c1 | 3691 | ei->i_file_acl = le32_to_cpu(raw_inode->i_file_acl_lo); |
a9e81742 | 3692 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) |
a1ddeb7e BP |
3693 | ei->i_file_acl |= |
3694 | ((__u64)le16_to_cpu(raw_inode->i_file_acl_high)) << 32; | |
a48380f7 | 3695 | inode->i_size = ext4_isize(raw_inode); |
ac27a0ec | 3696 | ei->i_disksize = inode->i_size; |
a9e7f447 DM |
3697 | #ifdef CONFIG_QUOTA |
3698 | ei->i_reserved_quota = 0; | |
3699 | #endif | |
ac27a0ec DK |
3700 | inode->i_generation = le32_to_cpu(raw_inode->i_generation); |
3701 | ei->i_block_group = iloc.block_group; | |
a4912123 | 3702 | ei->i_last_alloc_group = ~0; |
ac27a0ec DK |
3703 | /* |
3704 | * NOTE! The in-memory inode i_data array is in little-endian order | |
3705 | * even on big-endian machines: we do NOT byteswap the block numbers! | |
3706 | */ | |
617ba13b | 3707 | for (block = 0; block < EXT4_N_BLOCKS; block++) |
ac27a0ec DK |
3708 | ei->i_data[block] = raw_inode->i_block[block]; |
3709 | INIT_LIST_HEAD(&ei->i_orphan); | |
3710 | ||
b436b9be JK |
3711 | /* |
3712 | * Set transaction id's of transactions that have to be committed | |
3713 | * to finish f[data]sync. We set them to currently running transaction | |
3714 | * as we cannot be sure that the inode or some of its metadata isn't | |
3715 | * part of the transaction - the inode could have been reclaimed and | |
3716 | * now it is reread from disk. | |
3717 | */ | |
3718 | if (journal) { | |
3719 | transaction_t *transaction; | |
3720 | tid_t tid; | |
3721 | ||
a931da6a | 3722 | read_lock(&journal->j_state_lock); |
b436b9be JK |
3723 | if (journal->j_running_transaction) |
3724 | transaction = journal->j_running_transaction; | |
3725 | else | |
3726 | transaction = journal->j_committing_transaction; | |
3727 | if (transaction) | |
3728 | tid = transaction->t_tid; | |
3729 | else | |
3730 | tid = journal->j_commit_sequence; | |
a931da6a | 3731 | read_unlock(&journal->j_state_lock); |
b436b9be JK |
3732 | ei->i_sync_tid = tid; |
3733 | ei->i_datasync_tid = tid; | |
3734 | } | |
3735 | ||
0040d987 | 3736 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) { |
ac27a0ec | 3737 | ei->i_extra_isize = le16_to_cpu(raw_inode->i_extra_isize); |
617ba13b | 3738 | if (EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize > |
e5d2861f | 3739 | EXT4_INODE_SIZE(inode->i_sb)) { |
1d1fe1ee | 3740 | ret = -EIO; |
ac27a0ec | 3741 | goto bad_inode; |
e5d2861f | 3742 | } |
ac27a0ec DK |
3743 | if (ei->i_extra_isize == 0) { |
3744 | /* The extra space is currently unused. Use it. */ | |
617ba13b MC |
3745 | ei->i_extra_isize = sizeof(struct ext4_inode) - |
3746 | EXT4_GOOD_OLD_INODE_SIZE; | |
ac27a0ec DK |
3747 | } else { |
3748 | __le32 *magic = (void *)raw_inode + | |
617ba13b | 3749 | EXT4_GOOD_OLD_INODE_SIZE + |
ac27a0ec | 3750 | ei->i_extra_isize; |
617ba13b | 3751 | if (*magic == cpu_to_le32(EXT4_XATTR_MAGIC)) |
19f5fb7a | 3752 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
3753 | } |
3754 | } else | |
3755 | ei->i_extra_isize = 0; | |
3756 | ||
ef7f3835 KS |
3757 | EXT4_INODE_GET_XTIME(i_ctime, inode, raw_inode); |
3758 | EXT4_INODE_GET_XTIME(i_mtime, inode, raw_inode); | |
3759 | EXT4_INODE_GET_XTIME(i_atime, inode, raw_inode); | |
3760 | EXT4_EINODE_GET_XTIME(i_crtime, ei, raw_inode); | |
3761 | ||
25ec56b5 JNC |
3762 | inode->i_version = le32_to_cpu(raw_inode->i_disk_version); |
3763 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) { | |
3764 | if (EXT4_FITS_IN_INODE(raw_inode, ei, i_version_hi)) | |
3765 | inode->i_version |= | |
3766 | (__u64)(le32_to_cpu(raw_inode->i_version_hi)) << 32; | |
3767 | } | |
3768 | ||
c4b5a614 | 3769 | ret = 0; |
485c26ec | 3770 | if (ei->i_file_acl && |
1032988c | 3771 | !ext4_data_block_valid(EXT4_SB(sb), ei->i_file_acl, 1)) { |
24676da4 TT |
3772 | EXT4_ERROR_INODE(inode, "bad extended attribute block %llu", |
3773 | ei->i_file_acl); | |
485c26ec TT |
3774 | ret = -EIO; |
3775 | goto bad_inode; | |
07a03824 | 3776 | } else if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { |
c4b5a614 TT |
3777 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
3778 | (S_ISLNK(inode->i_mode) && | |
3779 | !ext4_inode_is_fast_symlink(inode))) | |
3780 | /* Validate extent which is part of inode */ | |
3781 | ret = ext4_ext_check_inode(inode); | |
de9a55b8 | 3782 | } else if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
fe2c8191 TN |
3783 | (S_ISLNK(inode->i_mode) && |
3784 | !ext4_inode_is_fast_symlink(inode))) { | |
de9a55b8 | 3785 | /* Validate block references which are part of inode */ |
1f7d1e77 | 3786 | ret = ext4_ind_check_inode(inode); |
fe2c8191 | 3787 | } |
567f3e9a | 3788 | if (ret) |
de9a55b8 | 3789 | goto bad_inode; |
7a262f7c | 3790 | |
ac27a0ec | 3791 | if (S_ISREG(inode->i_mode)) { |
617ba13b MC |
3792 | inode->i_op = &ext4_file_inode_operations; |
3793 | inode->i_fop = &ext4_file_operations; | |
3794 | ext4_set_aops(inode); | |
ac27a0ec | 3795 | } else if (S_ISDIR(inode->i_mode)) { |
617ba13b MC |
3796 | inode->i_op = &ext4_dir_inode_operations; |
3797 | inode->i_fop = &ext4_dir_operations; | |
ac27a0ec | 3798 | } else if (S_ISLNK(inode->i_mode)) { |
e83c1397 | 3799 | if (ext4_inode_is_fast_symlink(inode)) { |
617ba13b | 3800 | inode->i_op = &ext4_fast_symlink_inode_operations; |
e83c1397 DG |
3801 | nd_terminate_link(ei->i_data, inode->i_size, |
3802 | sizeof(ei->i_data) - 1); | |
3803 | } else { | |
617ba13b MC |
3804 | inode->i_op = &ext4_symlink_inode_operations; |
3805 | ext4_set_aops(inode); | |
ac27a0ec | 3806 | } |
563bdd61 TT |
3807 | } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || |
3808 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
617ba13b | 3809 | inode->i_op = &ext4_special_inode_operations; |
ac27a0ec DK |
3810 | if (raw_inode->i_block[0]) |
3811 | init_special_inode(inode, inode->i_mode, | |
3812 | old_decode_dev(le32_to_cpu(raw_inode->i_block[0]))); | |
3813 | else | |
3814 | init_special_inode(inode, inode->i_mode, | |
3815 | new_decode_dev(le32_to_cpu(raw_inode->i_block[1]))); | |
563bdd61 | 3816 | } else { |
563bdd61 | 3817 | ret = -EIO; |
24676da4 | 3818 | EXT4_ERROR_INODE(inode, "bogus i_mode (%o)", inode->i_mode); |
563bdd61 | 3819 | goto bad_inode; |
ac27a0ec | 3820 | } |
af5bc92d | 3821 | brelse(iloc.bh); |
617ba13b | 3822 | ext4_set_inode_flags(inode); |
1d1fe1ee DH |
3823 | unlock_new_inode(inode); |
3824 | return inode; | |
ac27a0ec DK |
3825 | |
3826 | bad_inode: | |
567f3e9a | 3827 | brelse(iloc.bh); |
1d1fe1ee DH |
3828 | iget_failed(inode); |
3829 | return ERR_PTR(ret); | |
ac27a0ec DK |
3830 | } |
3831 | ||
0fc1b451 AK |
3832 | static int ext4_inode_blocks_set(handle_t *handle, |
3833 | struct ext4_inode *raw_inode, | |
3834 | struct ext4_inode_info *ei) | |
3835 | { | |
3836 | struct inode *inode = &(ei->vfs_inode); | |
3837 | u64 i_blocks = inode->i_blocks; | |
3838 | struct super_block *sb = inode->i_sb; | |
0fc1b451 AK |
3839 | |
3840 | if (i_blocks <= ~0U) { | |
3841 | /* | |
3842 | * i_blocks can be represnted in a 32 bit variable | |
3843 | * as multiple of 512 bytes | |
3844 | */ | |
8180a562 | 3845 | raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); |
0fc1b451 | 3846 | raw_inode->i_blocks_high = 0; |
84a8dce2 | 3847 | ext4_clear_inode_flag(inode, EXT4_INODE_HUGE_FILE); |
f287a1a5 TT |
3848 | return 0; |
3849 | } | |
3850 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) | |
3851 | return -EFBIG; | |
3852 | ||
3853 | if (i_blocks <= 0xffffffffffffULL) { | |
0fc1b451 AK |
3854 | /* |
3855 | * i_blocks can be represented in a 48 bit variable | |
3856 | * as multiple of 512 bytes | |
3857 | */ | |
8180a562 | 3858 | raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); |
0fc1b451 | 3859 | raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32); |
84a8dce2 | 3860 | ext4_clear_inode_flag(inode, EXT4_INODE_HUGE_FILE); |
0fc1b451 | 3861 | } else { |
84a8dce2 | 3862 | ext4_set_inode_flag(inode, EXT4_INODE_HUGE_FILE); |
8180a562 AK |
3863 | /* i_block is stored in file system block size */ |
3864 | i_blocks = i_blocks >> (inode->i_blkbits - 9); | |
3865 | raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); | |
3866 | raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32); | |
0fc1b451 | 3867 | } |
f287a1a5 | 3868 | return 0; |
0fc1b451 AK |
3869 | } |
3870 | ||
ac27a0ec DK |
3871 | /* |
3872 | * Post the struct inode info into an on-disk inode location in the | |
3873 | * buffer-cache. This gobbles the caller's reference to the | |
3874 | * buffer_head in the inode location struct. | |
3875 | * | |
3876 | * The caller must have write access to iloc->bh. | |
3877 | */ | |
617ba13b | 3878 | static int ext4_do_update_inode(handle_t *handle, |
ac27a0ec | 3879 | struct inode *inode, |
830156c7 | 3880 | struct ext4_iloc *iloc) |
ac27a0ec | 3881 | { |
617ba13b MC |
3882 | struct ext4_inode *raw_inode = ext4_raw_inode(iloc); |
3883 | struct ext4_inode_info *ei = EXT4_I(inode); | |
ac27a0ec DK |
3884 | struct buffer_head *bh = iloc->bh; |
3885 | int err = 0, rc, block; | |
3886 | ||
3887 | /* For fields not not tracking in the in-memory inode, | |
3888 | * initialise them to zero for new inodes. */ | |
19f5fb7a | 3889 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) |
617ba13b | 3890 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); |
ac27a0ec | 3891 | |
ff9ddf7e | 3892 | ext4_get_inode_flags(ei); |
ac27a0ec | 3893 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); |
af5bc92d | 3894 | if (!(test_opt(inode->i_sb, NO_UID32))) { |
ac27a0ec DK |
3895 | raw_inode->i_uid_low = cpu_to_le16(low_16_bits(inode->i_uid)); |
3896 | raw_inode->i_gid_low = cpu_to_le16(low_16_bits(inode->i_gid)); | |
3897 | /* | |
3898 | * Fix up interoperability with old kernels. Otherwise, old inodes get | |
3899 | * re-used with the upper 16 bits of the uid/gid intact | |
3900 | */ | |
af5bc92d | 3901 | if (!ei->i_dtime) { |
ac27a0ec DK |
3902 | raw_inode->i_uid_high = |
3903 | cpu_to_le16(high_16_bits(inode->i_uid)); | |
3904 | raw_inode->i_gid_high = | |
3905 | cpu_to_le16(high_16_bits(inode->i_gid)); | |
3906 | } else { | |
3907 | raw_inode->i_uid_high = 0; | |
3908 | raw_inode->i_gid_high = 0; | |
3909 | } | |
3910 | } else { | |
3911 | raw_inode->i_uid_low = | |
3912 | cpu_to_le16(fs_high2lowuid(inode->i_uid)); | |
3913 | raw_inode->i_gid_low = | |
3914 | cpu_to_le16(fs_high2lowgid(inode->i_gid)); | |
3915 | raw_inode->i_uid_high = 0; | |
3916 | raw_inode->i_gid_high = 0; | |
3917 | } | |
3918 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); | |
ef7f3835 KS |
3919 | |
3920 | EXT4_INODE_SET_XTIME(i_ctime, inode, raw_inode); | |
3921 | EXT4_INODE_SET_XTIME(i_mtime, inode, raw_inode); | |
3922 | EXT4_INODE_SET_XTIME(i_atime, inode, raw_inode); | |
3923 | EXT4_EINODE_SET_XTIME(i_crtime, ei, raw_inode); | |
3924 | ||
0fc1b451 AK |
3925 | if (ext4_inode_blocks_set(handle, raw_inode, ei)) |
3926 | goto out_brelse; | |
ac27a0ec | 3927 | raw_inode->i_dtime = cpu_to_le32(ei->i_dtime); |
353eb83c | 3928 | raw_inode->i_flags = cpu_to_le32(ei->i_flags & 0xFFFFFFFF); |
9b8f1f01 MC |
3929 | if (EXT4_SB(inode->i_sb)->s_es->s_creator_os != |
3930 | cpu_to_le32(EXT4_OS_HURD)) | |
a1ddeb7e BP |
3931 | raw_inode->i_file_acl_high = |
3932 | cpu_to_le16(ei->i_file_acl >> 32); | |
7973c0c1 | 3933 | raw_inode->i_file_acl_lo = cpu_to_le32(ei->i_file_acl); |
a48380f7 AK |
3934 | ext4_isize_set(raw_inode, ei->i_disksize); |
3935 | if (ei->i_disksize > 0x7fffffffULL) { | |
3936 | struct super_block *sb = inode->i_sb; | |
3937 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
3938 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE) || | |
3939 | EXT4_SB(sb)->s_es->s_rev_level == | |
3940 | cpu_to_le32(EXT4_GOOD_OLD_REV)) { | |
3941 | /* If this is the first large file | |
3942 | * created, add a flag to the superblock. | |
3943 | */ | |
3944 | err = ext4_journal_get_write_access(handle, | |
3945 | EXT4_SB(sb)->s_sbh); | |
3946 | if (err) | |
3947 | goto out_brelse; | |
3948 | ext4_update_dynamic_rev(sb); | |
3949 | EXT4_SET_RO_COMPAT_FEATURE(sb, | |
617ba13b | 3950 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE); |
a48380f7 | 3951 | sb->s_dirt = 1; |
0390131b | 3952 | ext4_handle_sync(handle); |
73b50c1c | 3953 | err = ext4_handle_dirty_metadata(handle, NULL, |
a48380f7 | 3954 | EXT4_SB(sb)->s_sbh); |
ac27a0ec DK |
3955 | } |
3956 | } | |
3957 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); | |
3958 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
3959 | if (old_valid_dev(inode->i_rdev)) { | |
3960 | raw_inode->i_block[0] = | |
3961 | cpu_to_le32(old_encode_dev(inode->i_rdev)); | |
3962 | raw_inode->i_block[1] = 0; | |
3963 | } else { | |
3964 | raw_inode->i_block[0] = 0; | |
3965 | raw_inode->i_block[1] = | |
3966 | cpu_to_le32(new_encode_dev(inode->i_rdev)); | |
3967 | raw_inode->i_block[2] = 0; | |
3968 | } | |
de9a55b8 TT |
3969 | } else |
3970 | for (block = 0; block < EXT4_N_BLOCKS; block++) | |
3971 | raw_inode->i_block[block] = ei->i_data[block]; | |
ac27a0ec | 3972 | |
25ec56b5 JNC |
3973 | raw_inode->i_disk_version = cpu_to_le32(inode->i_version); |
3974 | if (ei->i_extra_isize) { | |
3975 | if (EXT4_FITS_IN_INODE(raw_inode, ei, i_version_hi)) | |
3976 | raw_inode->i_version_hi = | |
3977 | cpu_to_le32(inode->i_version >> 32); | |
ac27a0ec | 3978 | raw_inode->i_extra_isize = cpu_to_le16(ei->i_extra_isize); |
25ec56b5 JNC |
3979 | } |
3980 | ||
830156c7 | 3981 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); |
73b50c1c | 3982 | rc = ext4_handle_dirty_metadata(handle, NULL, bh); |
830156c7 FM |
3983 | if (!err) |
3984 | err = rc; | |
19f5fb7a | 3985 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec | 3986 | |
b436b9be | 3987 | ext4_update_inode_fsync_trans(handle, inode, 0); |
ac27a0ec | 3988 | out_brelse: |
af5bc92d | 3989 | brelse(bh); |
617ba13b | 3990 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
3991 | return err; |
3992 | } | |
3993 | ||
3994 | /* | |
617ba13b | 3995 | * ext4_write_inode() |
ac27a0ec DK |
3996 | * |
3997 | * We are called from a few places: | |
3998 | * | |
3999 | * - Within generic_file_write() for O_SYNC files. | |
4000 | * Here, there will be no transaction running. We wait for any running | |
4001 | * trasnaction to commit. | |
4002 | * | |
4003 | * - Within sys_sync(), kupdate and such. | |
4004 | * We wait on commit, if tol to. | |
4005 | * | |
4006 | * - Within prune_icache() (PF_MEMALLOC == true) | |
4007 | * Here we simply return. We can't afford to block kswapd on the | |
4008 | * journal commit. | |
4009 | * | |
4010 | * In all cases it is actually safe for us to return without doing anything, | |
4011 | * because the inode has been copied into a raw inode buffer in | |
617ba13b | 4012 | * ext4_mark_inode_dirty(). This is a correctness thing for O_SYNC and for |
ac27a0ec DK |
4013 | * knfsd. |
4014 | * | |
4015 | * Note that we are absolutely dependent upon all inode dirtiers doing the | |
4016 | * right thing: they *must* call mark_inode_dirty() after dirtying info in | |
4017 | * which we are interested. | |
4018 | * | |
4019 | * It would be a bug for them to not do this. The code: | |
4020 | * | |
4021 | * mark_inode_dirty(inode) | |
4022 | * stuff(); | |
4023 | * inode->i_size = expr; | |
4024 | * | |
4025 | * is in error because a kswapd-driven write_inode() could occur while | |
4026 | * `stuff()' is running, and the new i_size will be lost. Plus the inode | |
4027 | * will no longer be on the superblock's dirty inode list. | |
4028 | */ | |
a9185b41 | 4029 | int ext4_write_inode(struct inode *inode, struct writeback_control *wbc) |
ac27a0ec | 4030 | { |
91ac6f43 FM |
4031 | int err; |
4032 | ||
ac27a0ec DK |
4033 | if (current->flags & PF_MEMALLOC) |
4034 | return 0; | |
4035 | ||
91ac6f43 FM |
4036 | if (EXT4_SB(inode->i_sb)->s_journal) { |
4037 | if (ext4_journal_current_handle()) { | |
4038 | jbd_debug(1, "called recursively, non-PF_MEMALLOC!\n"); | |
4039 | dump_stack(); | |
4040 | return -EIO; | |
4041 | } | |
ac27a0ec | 4042 | |
a9185b41 | 4043 | if (wbc->sync_mode != WB_SYNC_ALL) |
91ac6f43 FM |
4044 | return 0; |
4045 | ||
4046 | err = ext4_force_commit(inode->i_sb); | |
4047 | } else { | |
4048 | struct ext4_iloc iloc; | |
ac27a0ec | 4049 | |
8b472d73 | 4050 | err = __ext4_get_inode_loc(inode, &iloc, 0); |
91ac6f43 FM |
4051 | if (err) |
4052 | return err; | |
a9185b41 | 4053 | if (wbc->sync_mode == WB_SYNC_ALL) |
830156c7 FM |
4054 | sync_dirty_buffer(iloc.bh); |
4055 | if (buffer_req(iloc.bh) && !buffer_uptodate(iloc.bh)) { | |
c398eda0 TT |
4056 | EXT4_ERROR_INODE_BLOCK(inode, iloc.bh->b_blocknr, |
4057 | "IO error syncing inode"); | |
830156c7 FM |
4058 | err = -EIO; |
4059 | } | |
fd2dd9fb | 4060 | brelse(iloc.bh); |
91ac6f43 FM |
4061 | } |
4062 | return err; | |
ac27a0ec DK |
4063 | } |
4064 | ||
4065 | /* | |
617ba13b | 4066 | * ext4_setattr() |
ac27a0ec DK |
4067 | * |
4068 | * Called from notify_change. | |
4069 | * | |
4070 | * We want to trap VFS attempts to truncate the file as soon as | |
4071 | * possible. In particular, we want to make sure that when the VFS | |
4072 | * shrinks i_size, we put the inode on the orphan list and modify | |
4073 | * i_disksize immediately, so that during the subsequent flushing of | |
4074 | * dirty pages and freeing of disk blocks, we can guarantee that any | |
4075 | * commit will leave the blocks being flushed in an unused state on | |
4076 | * disk. (On recovery, the inode will get truncated and the blocks will | |
4077 | * be freed, so we have a strong guarantee that no future commit will | |
4078 | * leave these blocks visible to the user.) | |
4079 | * | |
678aaf48 JK |
4080 | * Another thing we have to assure is that if we are in ordered mode |
4081 | * and inode is still attached to the committing transaction, we must | |
4082 | * we start writeout of all the dirty pages which are being truncated. | |
4083 | * This way we are sure that all the data written in the previous | |
4084 | * transaction are already on disk (truncate waits for pages under | |
4085 | * writeback). | |
4086 | * | |
4087 | * Called with inode->i_mutex down. | |
ac27a0ec | 4088 | */ |
617ba13b | 4089 | int ext4_setattr(struct dentry *dentry, struct iattr *attr) |
ac27a0ec DK |
4090 | { |
4091 | struct inode *inode = dentry->d_inode; | |
4092 | int error, rc = 0; | |
3d287de3 | 4093 | int orphan = 0; |
ac27a0ec DK |
4094 | const unsigned int ia_valid = attr->ia_valid; |
4095 | ||
4096 | error = inode_change_ok(inode, attr); | |
4097 | if (error) | |
4098 | return error; | |
4099 | ||
12755627 | 4100 | if (is_quota_modification(inode, attr)) |
871a2931 | 4101 | dquot_initialize(inode); |
ac27a0ec DK |
4102 | if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) || |
4103 | (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) { | |
4104 | handle_t *handle; | |
4105 | ||
4106 | /* (user+group)*(old+new) structure, inode write (sb, | |
4107 | * inode block, ? - but truncate inode update has it) */ | |
5aca07eb | 4108 | handle = ext4_journal_start(inode, (EXT4_MAXQUOTAS_INIT_BLOCKS(inode->i_sb)+ |
194074ac | 4109 | EXT4_MAXQUOTAS_DEL_BLOCKS(inode->i_sb))+3); |
ac27a0ec DK |
4110 | if (IS_ERR(handle)) { |
4111 | error = PTR_ERR(handle); | |
4112 | goto err_out; | |
4113 | } | |
b43fa828 | 4114 | error = dquot_transfer(inode, attr); |
ac27a0ec | 4115 | if (error) { |
617ba13b | 4116 | ext4_journal_stop(handle); |
ac27a0ec DK |
4117 | return error; |
4118 | } | |
4119 | /* Update corresponding info in inode so that everything is in | |
4120 | * one transaction */ | |
4121 | if (attr->ia_valid & ATTR_UID) | |
4122 | inode->i_uid = attr->ia_uid; | |
4123 | if (attr->ia_valid & ATTR_GID) | |
4124 | inode->i_gid = attr->ia_gid; | |
617ba13b MC |
4125 | error = ext4_mark_inode_dirty(handle, inode); |
4126 | ext4_journal_stop(handle); | |
ac27a0ec DK |
4127 | } |
4128 | ||
e2b46574 | 4129 | if (attr->ia_valid & ATTR_SIZE) { |
562c72aa CH |
4130 | inode_dio_wait(inode); |
4131 | ||
12e9b892 | 4132 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) { |
e2b46574 ES |
4133 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
4134 | ||
0c095c7f TT |
4135 | if (attr->ia_size > sbi->s_bitmap_maxbytes) |
4136 | return -EFBIG; | |
e2b46574 ES |
4137 | } |
4138 | } | |
4139 | ||
ac27a0ec | 4140 | if (S_ISREG(inode->i_mode) && |
c8d46e41 | 4141 | attr->ia_valid & ATTR_SIZE && |
072bd7ea | 4142 | (attr->ia_size < inode->i_size)) { |
ac27a0ec DK |
4143 | handle_t *handle; |
4144 | ||
617ba13b | 4145 | handle = ext4_journal_start(inode, 3); |
ac27a0ec DK |
4146 | if (IS_ERR(handle)) { |
4147 | error = PTR_ERR(handle); | |
4148 | goto err_out; | |
4149 | } | |
3d287de3 DM |
4150 | if (ext4_handle_valid(handle)) { |
4151 | error = ext4_orphan_add(handle, inode); | |
4152 | orphan = 1; | |
4153 | } | |
617ba13b MC |
4154 | EXT4_I(inode)->i_disksize = attr->ia_size; |
4155 | rc = ext4_mark_inode_dirty(handle, inode); | |
ac27a0ec DK |
4156 | if (!error) |
4157 | error = rc; | |
617ba13b | 4158 | ext4_journal_stop(handle); |
678aaf48 JK |
4159 | |
4160 | if (ext4_should_order_data(inode)) { | |
4161 | error = ext4_begin_ordered_truncate(inode, | |
4162 | attr->ia_size); | |
4163 | if (error) { | |
4164 | /* Do as much error cleanup as possible */ | |
4165 | handle = ext4_journal_start(inode, 3); | |
4166 | if (IS_ERR(handle)) { | |
4167 | ext4_orphan_del(NULL, inode); | |
4168 | goto err_out; | |
4169 | } | |
4170 | ext4_orphan_del(handle, inode); | |
3d287de3 | 4171 | orphan = 0; |
678aaf48 JK |
4172 | ext4_journal_stop(handle); |
4173 | goto err_out; | |
4174 | } | |
4175 | } | |
ac27a0ec DK |
4176 | } |
4177 | ||
072bd7ea TT |
4178 | if (attr->ia_valid & ATTR_SIZE) { |
4179 | if (attr->ia_size != i_size_read(inode)) { | |
4180 | truncate_setsize(inode, attr->ia_size); | |
4181 | ext4_truncate(inode); | |
4182 | } else if (ext4_test_inode_flag(inode, EXT4_INODE_EOFBLOCKS)) | |
4183 | ext4_truncate(inode); | |
4184 | } | |
ac27a0ec | 4185 | |
1025774c CH |
4186 | if (!rc) { |
4187 | setattr_copy(inode, attr); | |
4188 | mark_inode_dirty(inode); | |
4189 | } | |
4190 | ||
4191 | /* | |
4192 | * If the call to ext4_truncate failed to get a transaction handle at | |
4193 | * all, we need to clean up the in-core orphan list manually. | |
4194 | */ | |
3d287de3 | 4195 | if (orphan && inode->i_nlink) |
617ba13b | 4196 | ext4_orphan_del(NULL, inode); |
ac27a0ec DK |
4197 | |
4198 | if (!rc && (ia_valid & ATTR_MODE)) | |
617ba13b | 4199 | rc = ext4_acl_chmod(inode); |
ac27a0ec DK |
4200 | |
4201 | err_out: | |
617ba13b | 4202 | ext4_std_error(inode->i_sb, error); |
ac27a0ec DK |
4203 | if (!error) |
4204 | error = rc; | |
4205 | return error; | |
4206 | } | |
4207 | ||
3e3398a0 MC |
4208 | int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, |
4209 | struct kstat *stat) | |
4210 | { | |
4211 | struct inode *inode; | |
4212 | unsigned long delalloc_blocks; | |
4213 | ||
4214 | inode = dentry->d_inode; | |
4215 | generic_fillattr(inode, stat); | |
4216 | ||
4217 | /* | |
4218 | * We can't update i_blocks if the block allocation is delayed | |
4219 | * otherwise in the case of system crash before the real block | |
4220 | * allocation is done, we will have i_blocks inconsistent with | |
4221 | * on-disk file blocks. | |
4222 | * We always keep i_blocks updated together with real | |
4223 | * allocation. But to not confuse with user, stat | |
4224 | * will return the blocks that include the delayed allocation | |
4225 | * blocks for this file. | |
4226 | */ | |
3e3398a0 | 4227 | delalloc_blocks = EXT4_I(inode)->i_reserved_data_blocks; |
3e3398a0 MC |
4228 | |
4229 | stat->blocks += (delalloc_blocks << inode->i_sb->s_blocksize_bits)>>9; | |
4230 | return 0; | |
4231 | } | |
ac27a0ec | 4232 | |
a02908f1 MC |
4233 | static int ext4_index_trans_blocks(struct inode *inode, int nrblocks, int chunk) |
4234 | { | |
12e9b892 | 4235 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
8bb2b247 | 4236 | return ext4_ind_trans_blocks(inode, nrblocks, chunk); |
ac51d837 | 4237 | return ext4_ext_index_trans_blocks(inode, nrblocks, chunk); |
a02908f1 | 4238 | } |
ac51d837 | 4239 | |
ac27a0ec | 4240 | /* |
a02908f1 MC |
4241 | * Account for index blocks, block groups bitmaps and block group |
4242 | * descriptor blocks if modify datablocks and index blocks | |
4243 | * worse case, the indexs blocks spread over different block groups | |
ac27a0ec | 4244 | * |
a02908f1 | 4245 | * If datablocks are discontiguous, they are possible to spread over |
af901ca1 | 4246 | * different block groups too. If they are contiuguous, with flexbg, |
a02908f1 | 4247 | * they could still across block group boundary. |
ac27a0ec | 4248 | * |
a02908f1 MC |
4249 | * Also account for superblock, inode, quota and xattr blocks |
4250 | */ | |
1f109d5a | 4251 | static int ext4_meta_trans_blocks(struct inode *inode, int nrblocks, int chunk) |
a02908f1 | 4252 | { |
8df9675f TT |
4253 | ext4_group_t groups, ngroups = ext4_get_groups_count(inode->i_sb); |
4254 | int gdpblocks; | |
a02908f1 MC |
4255 | int idxblocks; |
4256 | int ret = 0; | |
4257 | ||
4258 | /* | |
4259 | * How many index blocks need to touch to modify nrblocks? | |
4260 | * The "Chunk" flag indicating whether the nrblocks is | |
4261 | * physically contiguous on disk | |
4262 | * | |
4263 | * For Direct IO and fallocate, they calls get_block to allocate | |
4264 | * one single extent at a time, so they could set the "Chunk" flag | |
4265 | */ | |
4266 | idxblocks = ext4_index_trans_blocks(inode, nrblocks, chunk); | |
4267 | ||
4268 | ret = idxblocks; | |
4269 | ||
4270 | /* | |
4271 | * Now let's see how many group bitmaps and group descriptors need | |
4272 | * to account | |
4273 | */ | |
4274 | groups = idxblocks; | |
4275 | if (chunk) | |
4276 | groups += 1; | |
4277 | else | |
4278 | groups += nrblocks; | |
4279 | ||
4280 | gdpblocks = groups; | |
8df9675f TT |
4281 | if (groups > ngroups) |
4282 | groups = ngroups; | |
a02908f1 MC |
4283 | if (groups > EXT4_SB(inode->i_sb)->s_gdb_count) |
4284 | gdpblocks = EXT4_SB(inode->i_sb)->s_gdb_count; | |
4285 | ||
4286 | /* bitmaps and block group descriptor blocks */ | |
4287 | ret += groups + gdpblocks; | |
4288 | ||
4289 | /* Blocks for super block, inode, quota and xattr blocks */ | |
4290 | ret += EXT4_META_TRANS_BLOCKS(inode->i_sb); | |
4291 | ||
4292 | return ret; | |
4293 | } | |
4294 | ||
4295 | /* | |
25985edc | 4296 | * Calculate the total number of credits to reserve to fit |
f3bd1f3f MC |
4297 | * the modification of a single pages into a single transaction, |
4298 | * which may include multiple chunks of block allocations. | |
ac27a0ec | 4299 | * |
525f4ed8 | 4300 | * This could be called via ext4_write_begin() |
ac27a0ec | 4301 | * |
525f4ed8 | 4302 | * We need to consider the worse case, when |
a02908f1 | 4303 | * one new block per extent. |
ac27a0ec | 4304 | */ |
a86c6181 | 4305 | int ext4_writepage_trans_blocks(struct inode *inode) |
ac27a0ec | 4306 | { |
617ba13b | 4307 | int bpp = ext4_journal_blocks_per_page(inode); |
ac27a0ec DK |
4308 | int ret; |
4309 | ||
a02908f1 | 4310 | ret = ext4_meta_trans_blocks(inode, bpp, 0); |
a86c6181 | 4311 | |
a02908f1 | 4312 | /* Account for data blocks for journalled mode */ |
617ba13b | 4313 | if (ext4_should_journal_data(inode)) |
a02908f1 | 4314 | ret += bpp; |
ac27a0ec DK |
4315 | return ret; |
4316 | } | |
f3bd1f3f MC |
4317 | |
4318 | /* | |
4319 | * Calculate the journal credits for a chunk of data modification. | |
4320 | * | |
4321 | * This is called from DIO, fallocate or whoever calling | |
79e83036 | 4322 | * ext4_map_blocks() to map/allocate a chunk of contiguous disk blocks. |
f3bd1f3f MC |
4323 | * |
4324 | * journal buffers for data blocks are not included here, as DIO | |
4325 | * and fallocate do no need to journal data buffers. | |
4326 | */ | |
4327 | int ext4_chunk_trans_blocks(struct inode *inode, int nrblocks) | |
4328 | { | |
4329 | return ext4_meta_trans_blocks(inode, nrblocks, 1); | |
4330 | } | |
4331 | ||
ac27a0ec | 4332 | /* |
617ba13b | 4333 | * The caller must have previously called ext4_reserve_inode_write(). |
ac27a0ec DK |
4334 | * Give this, we know that the caller already has write access to iloc->bh. |
4335 | */ | |
617ba13b | 4336 | int ext4_mark_iloc_dirty(handle_t *handle, |
de9a55b8 | 4337 | struct inode *inode, struct ext4_iloc *iloc) |
ac27a0ec DK |
4338 | { |
4339 | int err = 0; | |
4340 | ||
25ec56b5 JNC |
4341 | if (test_opt(inode->i_sb, I_VERSION)) |
4342 | inode_inc_iversion(inode); | |
4343 | ||
ac27a0ec DK |
4344 | /* the do_update_inode consumes one bh->b_count */ |
4345 | get_bh(iloc->bh); | |
4346 | ||
dab291af | 4347 | /* ext4_do_update_inode() does jbd2_journal_dirty_metadata */ |
830156c7 | 4348 | err = ext4_do_update_inode(handle, inode, iloc); |
ac27a0ec DK |
4349 | put_bh(iloc->bh); |
4350 | return err; | |
4351 | } | |
4352 | ||
4353 | /* | |
4354 | * On success, We end up with an outstanding reference count against | |
4355 | * iloc->bh. This _must_ be cleaned up later. | |
4356 | */ | |
4357 | ||
4358 | int | |
617ba13b MC |
4359 | ext4_reserve_inode_write(handle_t *handle, struct inode *inode, |
4360 | struct ext4_iloc *iloc) | |
ac27a0ec | 4361 | { |
0390131b FM |
4362 | int err; |
4363 | ||
4364 | err = ext4_get_inode_loc(inode, iloc); | |
4365 | if (!err) { | |
4366 | BUFFER_TRACE(iloc->bh, "get_write_access"); | |
4367 | err = ext4_journal_get_write_access(handle, iloc->bh); | |
4368 | if (err) { | |
4369 | brelse(iloc->bh); | |
4370 | iloc->bh = NULL; | |
ac27a0ec DK |
4371 | } |
4372 | } | |
617ba13b | 4373 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
4374 | return err; |
4375 | } | |
4376 | ||
6dd4ee7c KS |
4377 | /* |
4378 | * Expand an inode by new_extra_isize bytes. | |
4379 | * Returns 0 on success or negative error number on failure. | |
4380 | */ | |
1d03ec98 AK |
4381 | static int ext4_expand_extra_isize(struct inode *inode, |
4382 | unsigned int new_extra_isize, | |
4383 | struct ext4_iloc iloc, | |
4384 | handle_t *handle) | |
6dd4ee7c KS |
4385 | { |
4386 | struct ext4_inode *raw_inode; | |
4387 | struct ext4_xattr_ibody_header *header; | |
6dd4ee7c KS |
4388 | |
4389 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) | |
4390 | return 0; | |
4391 | ||
4392 | raw_inode = ext4_raw_inode(&iloc); | |
4393 | ||
4394 | header = IHDR(inode, raw_inode); | |
6dd4ee7c KS |
4395 | |
4396 | /* No extended attributes present */ | |
19f5fb7a TT |
4397 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR) || |
4398 | header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)) { | |
6dd4ee7c KS |
4399 | memset((void *)raw_inode + EXT4_GOOD_OLD_INODE_SIZE, 0, |
4400 | new_extra_isize); | |
4401 | EXT4_I(inode)->i_extra_isize = new_extra_isize; | |
4402 | return 0; | |
4403 | } | |
4404 | ||
4405 | /* try to expand with EAs present */ | |
4406 | return ext4_expand_extra_isize_ea(inode, new_extra_isize, | |
4407 | raw_inode, handle); | |
4408 | } | |
4409 | ||
ac27a0ec DK |
4410 | /* |
4411 | * What we do here is to mark the in-core inode as clean with respect to inode | |
4412 | * dirtiness (it may still be data-dirty). | |
4413 | * This means that the in-core inode may be reaped by prune_icache | |
4414 | * without having to perform any I/O. This is a very good thing, | |
4415 | * because *any* task may call prune_icache - even ones which | |
4416 | * have a transaction open against a different journal. | |
4417 | * | |
4418 | * Is this cheating? Not really. Sure, we haven't written the | |
4419 | * inode out, but prune_icache isn't a user-visible syncing function. | |
4420 | * Whenever the user wants stuff synced (sys_sync, sys_msync, sys_fsync) | |
4421 | * we start and wait on commits. | |
4422 | * | |
4423 | * Is this efficient/effective? Well, we're being nice to the system | |
4424 | * by cleaning up our inodes proactively so they can be reaped | |
4425 | * without I/O. But we are potentially leaving up to five seconds' | |
4426 | * worth of inodes floating about which prune_icache wants us to | |
4427 | * write out. One way to fix that would be to get prune_icache() | |
4428 | * to do a write_super() to free up some memory. It has the desired | |
4429 | * effect. | |
4430 | */ | |
617ba13b | 4431 | int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode) |
ac27a0ec | 4432 | { |
617ba13b | 4433 | struct ext4_iloc iloc; |
6dd4ee7c KS |
4434 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
4435 | static unsigned int mnt_count; | |
4436 | int err, ret; | |
ac27a0ec DK |
4437 | |
4438 | might_sleep(); | |
7ff9c073 | 4439 | trace_ext4_mark_inode_dirty(inode, _RET_IP_); |
617ba13b | 4440 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
0390131b FM |
4441 | if (ext4_handle_valid(handle) && |
4442 | EXT4_I(inode)->i_extra_isize < sbi->s_want_extra_isize && | |
19f5fb7a | 4443 | !ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND)) { |
6dd4ee7c KS |
4444 | /* |
4445 | * We need extra buffer credits since we may write into EA block | |
4446 | * with this same handle. If journal_extend fails, then it will | |
4447 | * only result in a minor loss of functionality for that inode. | |
4448 | * If this is felt to be critical, then e2fsck should be run to | |
4449 | * force a large enough s_min_extra_isize. | |
4450 | */ | |
4451 | if ((jbd2_journal_extend(handle, | |
4452 | EXT4_DATA_TRANS_BLOCKS(inode->i_sb))) == 0) { | |
4453 | ret = ext4_expand_extra_isize(inode, | |
4454 | sbi->s_want_extra_isize, | |
4455 | iloc, handle); | |
4456 | if (ret) { | |
19f5fb7a TT |
4457 | ext4_set_inode_state(inode, |
4458 | EXT4_STATE_NO_EXPAND); | |
c1bddad9 AK |
4459 | if (mnt_count != |
4460 | le16_to_cpu(sbi->s_es->s_mnt_count)) { | |
12062ddd | 4461 | ext4_warning(inode->i_sb, |
6dd4ee7c KS |
4462 | "Unable to expand inode %lu. Delete" |
4463 | " some EAs or run e2fsck.", | |
4464 | inode->i_ino); | |
c1bddad9 AK |
4465 | mnt_count = |
4466 | le16_to_cpu(sbi->s_es->s_mnt_count); | |
6dd4ee7c KS |
4467 | } |
4468 | } | |
4469 | } | |
4470 | } | |
ac27a0ec | 4471 | if (!err) |
617ba13b | 4472 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec DK |
4473 | return err; |
4474 | } | |
4475 | ||
4476 | /* | |
617ba13b | 4477 | * ext4_dirty_inode() is called from __mark_inode_dirty() |
ac27a0ec DK |
4478 | * |
4479 | * We're really interested in the case where a file is being extended. | |
4480 | * i_size has been changed by generic_commit_write() and we thus need | |
4481 | * to include the updated inode in the current transaction. | |
4482 | * | |
5dd4056d | 4483 | * Also, dquot_alloc_block() will always dirty the inode when blocks |
ac27a0ec DK |
4484 | * are allocated to the file. |
4485 | * | |
4486 | * If the inode is marked synchronous, we don't honour that here - doing | |
4487 | * so would cause a commit on atime updates, which we don't bother doing. | |
4488 | * We handle synchronous inodes at the highest possible level. | |
4489 | */ | |
aa385729 | 4490 | void ext4_dirty_inode(struct inode *inode, int flags) |
ac27a0ec | 4491 | { |
ac27a0ec DK |
4492 | handle_t *handle; |
4493 | ||
617ba13b | 4494 | handle = ext4_journal_start(inode, 2); |
ac27a0ec DK |
4495 | if (IS_ERR(handle)) |
4496 | goto out; | |
f3dc272f | 4497 | |
f3dc272f CW |
4498 | ext4_mark_inode_dirty(handle, inode); |
4499 | ||
617ba13b | 4500 | ext4_journal_stop(handle); |
ac27a0ec DK |
4501 | out: |
4502 | return; | |
4503 | } | |
4504 | ||
4505 | #if 0 | |
4506 | /* | |
4507 | * Bind an inode's backing buffer_head into this transaction, to prevent | |
4508 | * it from being flushed to disk early. Unlike | |
617ba13b | 4509 | * ext4_reserve_inode_write, this leaves behind no bh reference and |
ac27a0ec DK |
4510 | * returns no iloc structure, so the caller needs to repeat the iloc |
4511 | * lookup to mark the inode dirty later. | |
4512 | */ | |
617ba13b | 4513 | static int ext4_pin_inode(handle_t *handle, struct inode *inode) |
ac27a0ec | 4514 | { |
617ba13b | 4515 | struct ext4_iloc iloc; |
ac27a0ec DK |
4516 | |
4517 | int err = 0; | |
4518 | if (handle) { | |
617ba13b | 4519 | err = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
4520 | if (!err) { |
4521 | BUFFER_TRACE(iloc.bh, "get_write_access"); | |
dab291af | 4522 | err = jbd2_journal_get_write_access(handle, iloc.bh); |
ac27a0ec | 4523 | if (!err) |
0390131b | 4524 | err = ext4_handle_dirty_metadata(handle, |
73b50c1c | 4525 | NULL, |
0390131b | 4526 | iloc.bh); |
ac27a0ec DK |
4527 | brelse(iloc.bh); |
4528 | } | |
4529 | } | |
617ba13b | 4530 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
4531 | return err; |
4532 | } | |
4533 | #endif | |
4534 | ||
617ba13b | 4535 | int ext4_change_inode_journal_flag(struct inode *inode, int val) |
ac27a0ec DK |
4536 | { |
4537 | journal_t *journal; | |
4538 | handle_t *handle; | |
4539 | int err; | |
4540 | ||
4541 | /* | |
4542 | * We have to be very careful here: changing a data block's | |
4543 | * journaling status dynamically is dangerous. If we write a | |
4544 | * data block to the journal, change the status and then delete | |
4545 | * that block, we risk forgetting to revoke the old log record | |
4546 | * from the journal and so a subsequent replay can corrupt data. | |
4547 | * So, first we make sure that the journal is empty and that | |
4548 | * nobody is changing anything. | |
4549 | */ | |
4550 | ||
617ba13b | 4551 | journal = EXT4_JOURNAL(inode); |
0390131b FM |
4552 | if (!journal) |
4553 | return 0; | |
d699594d | 4554 | if (is_journal_aborted(journal)) |
ac27a0ec DK |
4555 | return -EROFS; |
4556 | ||
dab291af MC |
4557 | jbd2_journal_lock_updates(journal); |
4558 | jbd2_journal_flush(journal); | |
ac27a0ec DK |
4559 | |
4560 | /* | |
4561 | * OK, there are no updates running now, and all cached data is | |
4562 | * synced to disk. We are now in a completely consistent state | |
4563 | * which doesn't have anything in the journal, and we know that | |
4564 | * no filesystem updates are running, so it is safe to modify | |
4565 | * the inode's in-core data-journaling state flag now. | |
4566 | */ | |
4567 | ||
4568 | if (val) | |
12e9b892 | 4569 | ext4_set_inode_flag(inode, EXT4_INODE_JOURNAL_DATA); |
ac27a0ec | 4570 | else |
12e9b892 | 4571 | ext4_clear_inode_flag(inode, EXT4_INODE_JOURNAL_DATA); |
617ba13b | 4572 | ext4_set_aops(inode); |
ac27a0ec | 4573 | |
dab291af | 4574 | jbd2_journal_unlock_updates(journal); |
ac27a0ec DK |
4575 | |
4576 | /* Finally we can mark the inode as dirty. */ | |
4577 | ||
617ba13b | 4578 | handle = ext4_journal_start(inode, 1); |
ac27a0ec DK |
4579 | if (IS_ERR(handle)) |
4580 | return PTR_ERR(handle); | |
4581 | ||
617ba13b | 4582 | err = ext4_mark_inode_dirty(handle, inode); |
0390131b | 4583 | ext4_handle_sync(handle); |
617ba13b MC |
4584 | ext4_journal_stop(handle); |
4585 | ext4_std_error(inode->i_sb, err); | |
ac27a0ec DK |
4586 | |
4587 | return err; | |
4588 | } | |
2e9ee850 AK |
4589 | |
4590 | static int ext4_bh_unmapped(handle_t *handle, struct buffer_head *bh) | |
4591 | { | |
4592 | return !buffer_mapped(bh); | |
4593 | } | |
4594 | ||
c2ec175c | 4595 | int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
2e9ee850 | 4596 | { |
c2ec175c | 4597 | struct page *page = vmf->page; |
2e9ee850 AK |
4598 | loff_t size; |
4599 | unsigned long len; | |
9ea7df53 | 4600 | int ret; |
2e9ee850 AK |
4601 | struct file *file = vma->vm_file; |
4602 | struct inode *inode = file->f_path.dentry->d_inode; | |
4603 | struct address_space *mapping = inode->i_mapping; | |
9ea7df53 JK |
4604 | handle_t *handle; |
4605 | get_block_t *get_block; | |
4606 | int retries = 0; | |
2e9ee850 AK |
4607 | |
4608 | /* | |
9ea7df53 JK |
4609 | * This check is racy but catches the common case. We rely on |
4610 | * __block_page_mkwrite() to do a reliable check. | |
2e9ee850 | 4611 | */ |
9ea7df53 JK |
4612 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
4613 | /* Delalloc case is easy... */ | |
4614 | if (test_opt(inode->i_sb, DELALLOC) && | |
4615 | !ext4_should_journal_data(inode) && | |
4616 | !ext4_nonda_switch(inode->i_sb)) { | |
4617 | do { | |
4618 | ret = __block_page_mkwrite(vma, vmf, | |
4619 | ext4_da_get_block_prep); | |
4620 | } while (ret == -ENOSPC && | |
4621 | ext4_should_retry_alloc(inode->i_sb, &retries)); | |
4622 | goto out_ret; | |
2e9ee850 | 4623 | } |
0e499890 DW |
4624 | |
4625 | lock_page(page); | |
9ea7df53 JK |
4626 | size = i_size_read(inode); |
4627 | /* Page got truncated from under us? */ | |
4628 | if (page->mapping != mapping || page_offset(page) > size) { | |
4629 | unlock_page(page); | |
4630 | ret = VM_FAULT_NOPAGE; | |
4631 | goto out; | |
0e499890 | 4632 | } |
2e9ee850 AK |
4633 | |
4634 | if (page->index == size >> PAGE_CACHE_SHIFT) | |
4635 | len = size & ~PAGE_CACHE_MASK; | |
4636 | else | |
4637 | len = PAGE_CACHE_SIZE; | |
a827eaff | 4638 | /* |
9ea7df53 JK |
4639 | * Return if we have all the buffers mapped. This avoids the need to do |
4640 | * journal_start/journal_stop which can block and take a long time | |
a827eaff | 4641 | */ |
2e9ee850 | 4642 | if (page_has_buffers(page)) { |
2e9ee850 | 4643 | if (!walk_page_buffers(NULL, page_buffers(page), 0, len, NULL, |
a827eaff | 4644 | ext4_bh_unmapped)) { |
9ea7df53 JK |
4645 | /* Wait so that we don't change page under IO */ |
4646 | wait_on_page_writeback(page); | |
4647 | ret = VM_FAULT_LOCKED; | |
4648 | goto out; | |
a827eaff | 4649 | } |
2e9ee850 | 4650 | } |
a827eaff | 4651 | unlock_page(page); |
9ea7df53 JK |
4652 | /* OK, we need to fill the hole... */ |
4653 | if (ext4_should_dioread_nolock(inode)) | |
4654 | get_block = ext4_get_block_write; | |
4655 | else | |
4656 | get_block = ext4_get_block; | |
4657 | retry_alloc: | |
4658 | handle = ext4_journal_start(inode, ext4_writepage_trans_blocks(inode)); | |
4659 | if (IS_ERR(handle)) { | |
c2ec175c | 4660 | ret = VM_FAULT_SIGBUS; |
9ea7df53 JK |
4661 | goto out; |
4662 | } | |
4663 | ret = __block_page_mkwrite(vma, vmf, get_block); | |
4664 | if (!ret && ext4_should_journal_data(inode)) { | |
4665 | if (walk_page_buffers(handle, page_buffers(page), 0, | |
4666 | PAGE_CACHE_SIZE, NULL, do_journal_get_write_access)) { | |
4667 | unlock_page(page); | |
4668 | ret = VM_FAULT_SIGBUS; | |
4669 | goto out; | |
4670 | } | |
4671 | ext4_set_inode_state(inode, EXT4_STATE_JDATA); | |
4672 | } | |
4673 | ext4_journal_stop(handle); | |
4674 | if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) | |
4675 | goto retry_alloc; | |
4676 | out_ret: | |
4677 | ret = block_page_mkwrite_return(ret); | |
4678 | out: | |
2e9ee850 AK |
4679 | return ret; |
4680 | } |