Commit | Line | Data |
---|---|---|
bd2d0210 TT |
1 | /* |
2 | * linux/fs/ext4/page-io.c | |
3 | * | |
4 | * This contains the new page_io functions for ext4 | |
5 | * | |
6 | * Written by Theodore Ts'o, 2010. | |
7 | */ | |
8 | ||
bd2d0210 TT |
9 | #include <linux/fs.h> |
10 | #include <linux/time.h> | |
bd2d0210 TT |
11 | #include <linux/highuid.h> |
12 | #include <linux/pagemap.h> | |
13 | #include <linux/quotaops.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/buffer_head.h> | |
16 | #include <linux/writeback.h> | |
17 | #include <linux/pagevec.h> | |
18 | #include <linux/mpage.h> | |
19 | #include <linux/namei.h> | |
20 | #include <linux/uio.h> | |
21 | #include <linux/bio.h> | |
22 | #include <linux/workqueue.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/slab.h> | |
1ae48a63 | 25 | #include <linux/mm.h> |
c9af28fd | 26 | #include <linux/backing-dev.h> |
bd2d0210 TT |
27 | |
28 | #include "ext4_jbd2.h" | |
29 | #include "xattr.h" | |
30 | #include "acl.h" | |
bd2d0210 | 31 | |
0058f965 | 32 | static struct kmem_cache *io_end_cachep; |
bd2d0210 | 33 | |
5dabfc78 | 34 | int __init ext4_init_pageio(void) |
bd2d0210 | 35 | { |
bd2d0210 | 36 | io_end_cachep = KMEM_CACHE(ext4_io_end, SLAB_RECLAIM_ACCOUNT); |
0058f965 | 37 | if (io_end_cachep == NULL) |
bd2d0210 | 38 | return -ENOMEM; |
bd2d0210 TT |
39 | return 0; |
40 | } | |
41 | ||
5dabfc78 | 42 | void ext4_exit_pageio(void) |
bd2d0210 TT |
43 | { |
44 | kmem_cache_destroy(io_end_cachep); | |
bd2d0210 TT |
45 | } |
46 | ||
b0857d30 JK |
47 | /* |
48 | * Print an buffer I/O error compatible with the fs/buffer.c. This | |
49 | * provides compatibility with dmesg scrapers that look for a specific | |
50 | * buffer I/O error message. We really need a unified error reporting | |
51 | * structure to userspace ala Digital Unix's uerf system, but it's | |
52 | * probably not going to happen in my lifetime, due to LKML politics... | |
53 | */ | |
54 | static void buffer_io_error(struct buffer_head *bh) | |
55 | { | |
a1c6f057 DM |
56 | printk_ratelimited(KERN_ERR "Buffer I/O error on device %pg, logical block %llu\n", |
57 | bh->b_bdev, | |
b0857d30 JK |
58 | (unsigned long long)bh->b_blocknr); |
59 | } | |
60 | ||
61 | static void ext4_finish_bio(struct bio *bio) | |
62 | { | |
63 | int i; | |
2c30c71b | 64 | struct bio_vec *bvec; |
b0857d30 | 65 | |
2c30c71b | 66 | bio_for_each_segment_all(bvec, bio, i) { |
b0857d30 | 67 | struct page *page = bvec->bv_page; |
2058f83a MH |
68 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
69 | struct page *data_page = NULL; | |
70 | struct ext4_crypto_ctx *ctx = NULL; | |
71 | #endif | |
b0857d30 JK |
72 | struct buffer_head *bh, *head; |
73 | unsigned bio_start = bvec->bv_offset; | |
74 | unsigned bio_end = bio_start + bvec->bv_len; | |
75 | unsigned under_io = 0; | |
76 | unsigned long flags; | |
77 | ||
78 | if (!page) | |
79 | continue; | |
80 | ||
2058f83a MH |
81 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
82 | if (!page->mapping) { | |
83 | /* The bounce data pages are unmapped. */ | |
84 | data_page = page; | |
85 | ctx = (struct ext4_crypto_ctx *)page_private(data_page); | |
614def70 | 86 | page = ctx->w.control_page; |
2058f83a MH |
87 | } |
88 | #endif | |
89 | ||
4246a0b6 | 90 | if (bio->bi_error) { |
b0857d30 JK |
91 | SetPageError(page); |
92 | set_bit(AS_EIO, &page->mapping->flags); | |
93 | } | |
94 | bh = head = page_buffers(page); | |
95 | /* | |
96 | * We check all buffers in the page under BH_Uptodate_Lock | |
97 | * to avoid races with other end io clearing async_write flags | |
98 | */ | |
99 | local_irq_save(flags); | |
100 | bit_spin_lock(BH_Uptodate_Lock, &head->b_state); | |
101 | do { | |
102 | if (bh_offset(bh) < bio_start || | |
103 | bh_offset(bh) + bh->b_size > bio_end) { | |
104 | if (buffer_async_write(bh)) | |
105 | under_io++; | |
106 | continue; | |
107 | } | |
108 | clear_buffer_async_write(bh); | |
4246a0b6 | 109 | if (bio->bi_error) |
b0857d30 JK |
110 | buffer_io_error(bh); |
111 | } while ((bh = bh->b_this_page) != head); | |
112 | bit_spin_unlock(BH_Uptodate_Lock, &head->b_state); | |
113 | local_irq_restore(flags); | |
2058f83a MH |
114 | if (!under_io) { |
115 | #ifdef CONFIG_EXT4_FS_ENCRYPTION | |
116 | if (ctx) | |
117 | ext4_restore_control_page(data_page); | |
118 | #endif | |
b0857d30 | 119 | end_page_writeback(page); |
2058f83a | 120 | } |
b0857d30 JK |
121 | } |
122 | } | |
123 | ||
97a851ed | 124 | static void ext4_release_io_end(ext4_io_end_t *io_end) |
bd2d0210 | 125 | { |
b0857d30 JK |
126 | struct bio *bio, *next_bio; |
127 | ||
97a851ed JK |
128 | BUG_ON(!list_empty(&io_end->list)); |
129 | BUG_ON(io_end->flag & EXT4_IO_END_UNWRITTEN); | |
6b523df4 | 130 | WARN_ON(io_end->handle); |
97a851ed | 131 | |
b0857d30 JK |
132 | for (bio = io_end->bio; bio; bio = next_bio) { |
133 | next_bio = bio->bi_private; | |
134 | ext4_finish_bio(bio); | |
135 | bio_put(bio); | |
136 | } | |
97a851ed JK |
137 | kmem_cache_free(io_end_cachep, io_end); |
138 | } | |
139 | ||
a115f749 JK |
140 | /* |
141 | * Check a range of space and convert unwritten extents to written. Note that | |
142 | * we are protected from truncate touching same part of extent tree by the | |
143 | * fact that truncate code waits for all DIO to finish (thus exclusion from | |
144 | * direct IO is achieved) and also waits for PageWriteback bits. Thus we | |
145 | * cannot get to ext4_ext_truncate() before all IOs overlapping that range are | |
146 | * completed (happens from ext4_free_ioend()). | |
147 | */ | |
28a535f9 | 148 | static int ext4_end_io(ext4_io_end_t *io) |
bd2d0210 TT |
149 | { |
150 | struct inode *inode = io->inode; | |
151 | loff_t offset = io->offset; | |
152 | ssize_t size = io->size; | |
6b523df4 | 153 | handle_t *handle = io->handle; |
bd2d0210 TT |
154 | int ret = 0; |
155 | ||
156 | ext4_debug("ext4_end_io_nolock: io 0x%p from inode %lu,list->next 0x%p," | |
157 | "list->prev 0x%p\n", | |
158 | io, inode->i_ino, io->list.next, io->list.prev); | |
159 | ||
6b523df4 JK |
160 | io->handle = NULL; /* Following call will use up the handle */ |
161 | ret = ext4_convert_unwritten_extents(handle, inode, offset, size); | |
bd2d0210 | 162 | if (ret < 0) { |
b82e384c TT |
163 | ext4_msg(inode->i_sb, KERN_EMERG, |
164 | "failed to convert unwritten extents to written " | |
165 | "extents -- potential data loss! " | |
166 | "(inode %lu, offset %llu, size %zd, error %d)", | |
167 | inode->i_ino, offset, size, ret); | |
bd2d0210 | 168 | } |
97a851ed JK |
169 | ext4_clear_io_unwritten_flag(io); |
170 | ext4_release_io_end(io); | |
bd2d0210 TT |
171 | return ret; |
172 | } | |
173 | ||
2e8fa54e | 174 | static void dump_completed_IO(struct inode *inode, struct list_head *head) |
28a535f9 DM |
175 | { |
176 | #ifdef EXT4FS_DEBUG | |
177 | struct list_head *cur, *before, *after; | |
178 | ext4_io_end_t *io, *io0, *io1; | |
28a535f9 | 179 | |
2e8fa54e | 180 | if (list_empty(head)) |
28a535f9 | 181 | return; |
28a535f9 | 182 | |
2e8fa54e JK |
183 | ext4_debug("Dump inode %lu completed io list\n", inode->i_ino); |
184 | list_for_each_entry(io, head, list) { | |
28a535f9 DM |
185 | cur = &io->list; |
186 | before = cur->prev; | |
187 | io0 = container_of(before, ext4_io_end_t, list); | |
188 | after = cur->next; | |
189 | io1 = container_of(after, ext4_io_end_t, list); | |
190 | ||
191 | ext4_debug("io 0x%p from inode %lu,prev 0x%p,next 0x%p\n", | |
192 | io, inode->i_ino, io0, io1); | |
193 | } | |
194 | #endif | |
195 | } | |
196 | ||
197 | /* Add the io_end to per-inode completed end_io list. */ | |
97a851ed | 198 | static void ext4_add_complete_io(ext4_io_end_t *io_end) |
bd2d0210 | 199 | { |
28a535f9 | 200 | struct ext4_inode_info *ei = EXT4_I(io_end->inode); |
78371a45 | 201 | struct ext4_sb_info *sbi = EXT4_SB(io_end->inode->i_sb); |
28a535f9 DM |
202 | struct workqueue_struct *wq; |
203 | unsigned long flags; | |
204 | ||
7b7a8665 CH |
205 | /* Only reserved conversions from writeback should enter here */ |
206 | WARN_ON(!(io_end->flag & EXT4_IO_END_UNWRITTEN)); | |
78371a45 | 207 | WARN_ON(!io_end->handle && sbi->s_journal); |
d73d5046 | 208 | spin_lock_irqsave(&ei->i_completed_io_lock, flags); |
78371a45 | 209 | wq = sbi->rsv_conversion_wq; |
7b7a8665 CH |
210 | if (list_empty(&ei->i_rsv_conversion_list)) |
211 | queue_work(wq, &ei->i_rsv_conversion_work); | |
212 | list_add_tail(&io_end->list, &ei->i_rsv_conversion_list); | |
28a535f9 DM |
213 | spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); |
214 | } | |
d73d5046 | 215 | |
2e8fa54e JK |
216 | static int ext4_do_flush_completed_IO(struct inode *inode, |
217 | struct list_head *head) | |
28a535f9 DM |
218 | { |
219 | ext4_io_end_t *io; | |
002bd7fa | 220 | struct list_head unwritten; |
28a535f9 DM |
221 | unsigned long flags; |
222 | struct ext4_inode_info *ei = EXT4_I(inode); | |
223 | int err, ret = 0; | |
224 | ||
28a535f9 | 225 | spin_lock_irqsave(&ei->i_completed_io_lock, flags); |
2e8fa54e JK |
226 | dump_completed_IO(inode, head); |
227 | list_replace_init(head, &unwritten); | |
28a535f9 DM |
228 | spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); |
229 | ||
230 | while (!list_empty(&unwritten)) { | |
231 | io = list_entry(unwritten.next, ext4_io_end_t, list); | |
232 | BUG_ON(!(io->flag & EXT4_IO_END_UNWRITTEN)); | |
233 | list_del_init(&io->list); | |
234 | ||
235 | err = ext4_end_io(io); | |
236 | if (unlikely(!ret && err)) | |
237 | ret = err; | |
28a535f9 DM |
238 | } |
239 | return ret; | |
240 | } | |
241 | ||
242 | /* | |
2e8fa54e | 243 | * work on completed IO, to convert unwritten extents to extents |
28a535f9 | 244 | */ |
2e8fa54e JK |
245 | void ext4_end_io_rsv_work(struct work_struct *work) |
246 | { | |
247 | struct ext4_inode_info *ei = container_of(work, struct ext4_inode_info, | |
248 | i_rsv_conversion_work); | |
249 | ext4_do_flush_completed_IO(&ei->vfs_inode, &ei->i_rsv_conversion_list); | |
250 | } | |
251 | ||
bd2d0210 TT |
252 | ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags) |
253 | { | |
b17b35ec | 254 | ext4_io_end_t *io = kmem_cache_zalloc(io_end_cachep, flags); |
bd2d0210 | 255 | if (io) { |
f7ad6d2e | 256 | io->inode = inode; |
bd2d0210 | 257 | INIT_LIST_HEAD(&io->list); |
97a851ed | 258 | atomic_set(&io->count, 1); |
bd2d0210 TT |
259 | } |
260 | return io; | |
261 | } | |
262 | ||
97a851ed JK |
263 | void ext4_put_io_end_defer(ext4_io_end_t *io_end) |
264 | { | |
265 | if (atomic_dec_and_test(&io_end->count)) { | |
266 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN) || !io_end->size) { | |
267 | ext4_release_io_end(io_end); | |
268 | return; | |
269 | } | |
270 | ext4_add_complete_io(io_end); | |
271 | } | |
272 | } | |
273 | ||
274 | int ext4_put_io_end(ext4_io_end_t *io_end) | |
275 | { | |
276 | int err = 0; | |
277 | ||
278 | if (atomic_dec_and_test(&io_end->count)) { | |
279 | if (io_end->flag & EXT4_IO_END_UNWRITTEN) { | |
6b523df4 JK |
280 | err = ext4_convert_unwritten_extents(io_end->handle, |
281 | io_end->inode, io_end->offset, | |
282 | io_end->size); | |
283 | io_end->handle = NULL; | |
97a851ed JK |
284 | ext4_clear_io_unwritten_flag(io_end); |
285 | } | |
286 | ext4_release_io_end(io_end); | |
287 | } | |
288 | return err; | |
289 | } | |
290 | ||
291 | ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end) | |
292 | { | |
293 | atomic_inc(&io_end->count); | |
294 | return io_end; | |
295 | } | |
296 | ||
822dbba3 | 297 | /* BIO completion function for page writeback */ |
4246a0b6 | 298 | static void ext4_end_bio(struct bio *bio) |
bd2d0210 TT |
299 | { |
300 | ext4_io_end_t *io_end = bio->bi_private; | |
4f024f37 | 301 | sector_t bi_sector = bio->bi_iter.bi_sector; |
bd2d0210 TT |
302 | |
303 | BUG_ON(!io_end); | |
bd2d0210 | 304 | bio->bi_end_io = NULL; |
0058f965 | 305 | |
4246a0b6 | 306 | if (bio->bi_error) { |
b0857d30 JK |
307 | struct inode *inode = io_end->inode; |
308 | ||
9503c67c | 309 | ext4_warning(inode->i_sb, "I/O error %d writing to inode %lu " |
f7ad6d2e | 310 | "(offset %llu size %ld starting block %llu)", |
4246a0b6 | 311 | bio->bi_error, inode->i_ino, |
f7ad6d2e TT |
312 | (unsigned long long) io_end->offset, |
313 | (long) io_end->size, | |
314 | (unsigned long long) | |
d50bdd5a | 315 | bi_sector >> (inode->i_blkbits - 9)); |
4246a0b6 | 316 | mapping_set_error(inode->i_mapping, bio->bi_error); |
f7ad6d2e | 317 | } |
822dbba3 JK |
318 | |
319 | if (io_end->flag & EXT4_IO_END_UNWRITTEN) { | |
320 | /* | |
321 | * Link bio into list hanging from io_end. We have to do it | |
322 | * atomically as bio completions can be racing against each | |
323 | * other. | |
324 | */ | |
325 | bio->bi_private = xchg(&io_end->bio, bio); | |
326 | ext4_put_io_end_defer(io_end); | |
327 | } else { | |
328 | /* | |
329 | * Drop io_end reference early. Inode can get freed once | |
330 | * we finish the bio. | |
331 | */ | |
332 | ext4_put_io_end_defer(io_end); | |
333 | ext4_finish_bio(bio); | |
334 | bio_put(bio); | |
335 | } | |
bd2d0210 TT |
336 | } |
337 | ||
338 | void ext4_io_submit(struct ext4_io_submit *io) | |
339 | { | |
340 | struct bio *bio = io->io_bio; | |
341 | ||
342 | if (bio) { | |
5a33911f TH |
343 | int io_op = io->io_wbc->sync_mode == WB_SYNC_ALL ? |
344 | WRITE_SYNC : WRITE; | |
5a33911f | 345 | submit_bio(io_op, io->io_bio); |
bd2d0210 | 346 | } |
7dc57615 | 347 | io->io_bio = NULL; |
97a851ed JK |
348 | } |
349 | ||
350 | void ext4_io_submit_init(struct ext4_io_submit *io, | |
351 | struct writeback_control *wbc) | |
352 | { | |
5a33911f | 353 | io->io_wbc = wbc; |
97a851ed | 354 | io->io_bio = NULL; |
7dc57615 | 355 | io->io_end = NULL; |
bd2d0210 TT |
356 | } |
357 | ||
97a851ed JK |
358 | static int io_submit_init_bio(struct ext4_io_submit *io, |
359 | struct buffer_head *bh) | |
bd2d0210 | 360 | { |
bd2d0210 TT |
361 | struct bio *bio; |
362 | ||
b54ffb73 | 363 | bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES); |
a1d8d9a7 TT |
364 | if (!bio) |
365 | return -ENOMEM; | |
001e4a87 | 366 | wbc_init_bio(io->io_wbc, bio); |
4f024f37 | 367 | bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9); |
bd2d0210 | 368 | bio->bi_bdev = bh->b_bdev; |
bd2d0210 | 369 | bio->bi_end_io = ext4_end_bio; |
97a851ed | 370 | bio->bi_private = ext4_get_io_end(io->io_end); |
bd2d0210 | 371 | io->io_bio = bio; |
bd2d0210 TT |
372 | io->io_next_block = bh->b_blocknr; |
373 | return 0; | |
374 | } | |
375 | ||
376 | static int io_submit_add_bh(struct ext4_io_submit *io, | |
bd2d0210 | 377 | struct inode *inode, |
2058f83a | 378 | struct page *page, |
bd2d0210 TT |
379 | struct buffer_head *bh) |
380 | { | |
bd2d0210 TT |
381 | int ret; |
382 | ||
bd2d0210 TT |
383 | if (io->io_bio && bh->b_blocknr != io->io_next_block) { |
384 | submit_and_retry: | |
385 | ext4_io_submit(io); | |
386 | } | |
387 | if (io->io_bio == NULL) { | |
97a851ed | 388 | ret = io_submit_init_bio(io, bh); |
bd2d0210 TT |
389 | if (ret) |
390 | return ret; | |
391 | } | |
2058f83a | 392 | ret = bio_add_page(io->io_bio, page, bh->b_size, bh_offset(bh)); |
97a851ed JK |
393 | if (ret != bh->b_size) |
394 | goto submit_and_retry; | |
001e4a87 | 395 | wbc_account_io(io->io_wbc, page, bh->b_size); |
bd2d0210 | 396 | io->io_next_block++; |
bd2d0210 TT |
397 | return 0; |
398 | } | |
399 | ||
400 | int ext4_bio_write_page(struct ext4_io_submit *io, | |
401 | struct page *page, | |
402 | int len, | |
1c8349a1 NJ |
403 | struct writeback_control *wbc, |
404 | bool keep_towrite) | |
bd2d0210 | 405 | { |
2058f83a | 406 | struct page *data_page = NULL; |
bd2d0210 | 407 | struct inode *inode = page->mapping->host; |
0058f965 | 408 | unsigned block_start, blocksize; |
bd2d0210 TT |
409 | struct buffer_head *bh, *head; |
410 | int ret = 0; | |
0058f965 | 411 | int nr_submitted = 0; |
937d7b84 | 412 | int nr_to_submit = 0; |
bd2d0210 TT |
413 | |
414 | blocksize = 1 << inode->i_blkbits; | |
415 | ||
d50bdd5a | 416 | BUG_ON(!PageLocked(page)); |
bd2d0210 | 417 | BUG_ON(PageWriteback(page)); |
bd2d0210 | 418 | |
1c8349a1 NJ |
419 | if (keep_towrite) |
420 | set_page_writeback_keepwrite(page); | |
421 | else | |
422 | set_page_writeback(page); | |
a54aa761 | 423 | ClearPageError(page); |
bd2d0210 | 424 | |
eeece469 | 425 | /* |
f8409abd | 426 | * Comments copied from block_write_full_page: |
eeece469 JK |
427 | * |
428 | * The page straddles i_size. It must be zeroed out on each and every | |
429 | * writepage invocation because it may be mmapped. "A file is mapped | |
430 | * in multiples of the page size. For a file that is not a multiple of | |
431 | * the page size, the remaining memory is zeroed when mapped, and | |
432 | * writes to that region are not written out to the file." | |
433 | */ | |
09cbfeaf KS |
434 | if (len < PAGE_SIZE) |
435 | zero_user_segment(page, len, PAGE_SIZE); | |
0058f965 JK |
436 | /* |
437 | * In the first loop we prepare and mark buffers to submit. We have to | |
438 | * mark all buffers in the page before submitting so that | |
439 | * end_page_writeback() cannot be called from ext4_bio_end_io() when IO | |
440 | * on the first buffer finishes and we are still working on submitting | |
441 | * the second buffer. | |
442 | */ | |
443 | bh = head = page_buffers(page); | |
444 | do { | |
445 | block_start = bh_offset(bh); | |
bd2d0210 TT |
446 | if (block_start >= len) { |
447 | clear_buffer_dirty(bh); | |
448 | set_buffer_uptodate(bh); | |
449 | continue; | |
450 | } | |
8a850c3f JK |
451 | if (!buffer_dirty(bh) || buffer_delay(bh) || |
452 | !buffer_mapped(bh) || buffer_unwritten(bh)) { | |
453 | /* A hole? We can safely clear the dirty bit */ | |
454 | if (!buffer_mapped(bh)) | |
455 | clear_buffer_dirty(bh); | |
456 | if (io->io_bio) | |
457 | ext4_io_submit(io); | |
458 | continue; | |
459 | } | |
0058f965 JK |
460 | if (buffer_new(bh)) { |
461 | clear_buffer_new(bh); | |
462 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); | |
463 | } | |
464 | set_buffer_async_write(bh); | |
937d7b84 | 465 | nr_to_submit++; |
0058f965 JK |
466 | } while ((bh = bh->b_this_page) != head); |
467 | ||
0058f965 | 468 | bh = head = page_buffers(page); |
2058f83a | 469 | |
937d7b84 TT |
470 | if (ext4_encrypted_inode(inode) && S_ISREG(inode->i_mode) && |
471 | nr_to_submit) { | |
c9af28fd TT |
472 | gfp_t gfp_flags = GFP_NOFS; |
473 | ||
474 | retry_encrypt: | |
475 | data_page = ext4_encrypt(inode, page, gfp_flags); | |
2058f83a MH |
476 | if (IS_ERR(data_page)) { |
477 | ret = PTR_ERR(data_page); | |
4762cc3f | 478 | if (ret == -ENOMEM && wbc->sync_mode == WB_SYNC_ALL) { |
c9af28fd TT |
479 | if (io->io_bio) { |
480 | ext4_io_submit(io); | |
481 | congestion_wait(BLK_RW_ASYNC, HZ/50); | |
482 | } | |
483 | gfp_flags |= __GFP_NOFAIL; | |
484 | goto retry_encrypt; | |
485 | } | |
2058f83a MH |
486 | data_page = NULL; |
487 | goto out; | |
488 | } | |
489 | } | |
490 | ||
491 | /* Now submit buffers to write */ | |
0058f965 JK |
492 | do { |
493 | if (!buffer_async_write(bh)) | |
494 | continue; | |
2058f83a MH |
495 | ret = io_submit_add_bh(io, inode, |
496 | data_page ? data_page : page, bh); | |
bd2d0210 TT |
497 | if (ret) { |
498 | /* | |
499 | * We only get here on ENOMEM. Not much else | |
500 | * we can do but mark the page as dirty, and | |
501 | * better luck next time. | |
502 | */ | |
bd2d0210 TT |
503 | break; |
504 | } | |
0058f965 | 505 | nr_submitted++; |
1ae48a63 | 506 | clear_buffer_dirty(bh); |
0058f965 JK |
507 | } while ((bh = bh->b_this_page) != head); |
508 | ||
509 | /* Error stopped previous loop? Clean up buffers... */ | |
510 | if (ret) { | |
2058f83a MH |
511 | out: |
512 | if (data_page) | |
513 | ext4_restore_control_page(data_page); | |
514 | printk_ratelimited(KERN_ERR "%s: ret = %d\n", __func__, ret); | |
515 | redirty_page_for_writepage(wbc, page); | |
0058f965 JK |
516 | do { |
517 | clear_buffer_async_write(bh); | |
518 | bh = bh->b_this_page; | |
519 | } while (bh != head); | |
bd2d0210 TT |
520 | } |
521 | unlock_page(page); | |
0058f965 JK |
522 | /* Nothing submitted - we have to end page writeback */ |
523 | if (!nr_submitted) | |
524 | end_page_writeback(page); | |
bd2d0210 TT |
525 | return ret; |
526 | } |