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> | |
11 | #include <linux/jbd2.h> | |
12 | #include <linux/highuid.h> | |
13 | #include <linux/pagemap.h> | |
14 | #include <linux/quotaops.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/buffer_head.h> | |
17 | #include <linux/writeback.h> | |
18 | #include <linux/pagevec.h> | |
19 | #include <linux/mpage.h> | |
20 | #include <linux/namei.h> | |
a27bb332 | 21 | #include <linux/aio.h> |
bd2d0210 TT |
22 | #include <linux/uio.h> |
23 | #include <linux/bio.h> | |
24 | #include <linux/workqueue.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/slab.h> | |
1ae48a63 | 27 | #include <linux/mm.h> |
bd2d0210 TT |
28 | |
29 | #include "ext4_jbd2.h" | |
30 | #include "xattr.h" | |
31 | #include "acl.h" | |
bd2d0210 | 32 | |
0058f965 | 33 | static struct kmem_cache *io_end_cachep; |
bd2d0210 | 34 | |
5dabfc78 | 35 | int __init ext4_init_pageio(void) |
bd2d0210 | 36 | { |
bd2d0210 | 37 | io_end_cachep = KMEM_CACHE(ext4_io_end, SLAB_RECLAIM_ACCOUNT); |
0058f965 | 38 | if (io_end_cachep == NULL) |
bd2d0210 | 39 | return -ENOMEM; |
bd2d0210 TT |
40 | return 0; |
41 | } | |
42 | ||
5dabfc78 | 43 | void ext4_exit_pageio(void) |
bd2d0210 TT |
44 | { |
45 | kmem_cache_destroy(io_end_cachep); | |
bd2d0210 TT |
46 | } |
47 | ||
1ada47d9 TT |
48 | /* |
49 | * This function is called by ext4_evict_inode() to make sure there is | |
50 | * no more pending I/O completion work left to do. | |
51 | */ | |
52 | void ext4_ioend_shutdown(struct inode *inode) | |
f7ad6d2e | 53 | { |
e9e3bcec | 54 | wait_queue_head_t *wq = ext4_ioend_wq(inode); |
f7ad6d2e TT |
55 | |
56 | wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_ioend_count) == 0)); | |
1ada47d9 TT |
57 | /* |
58 | * We need to make sure the work structure is finished being | |
59 | * used before we let the inode get destroyed. | |
60 | */ | |
2e8fa54e JK |
61 | if (work_pending(&EXT4_I(inode)->i_rsv_conversion_work)) |
62 | cancel_work_sync(&EXT4_I(inode)->i_rsv_conversion_work); | |
63 | if (work_pending(&EXT4_I(inode)->i_unrsv_conversion_work)) | |
64 | cancel_work_sync(&EXT4_I(inode)->i_unrsv_conversion_work); | |
f7ad6d2e TT |
65 | } |
66 | ||
97a851ed | 67 | static void ext4_release_io_end(ext4_io_end_t *io_end) |
bd2d0210 | 68 | { |
97a851ed JK |
69 | BUG_ON(!list_empty(&io_end->list)); |
70 | BUG_ON(io_end->flag & EXT4_IO_END_UNWRITTEN); | |
6b523df4 | 71 | WARN_ON(io_end->handle); |
97a851ed JK |
72 | |
73 | if (atomic_dec_and_test(&EXT4_I(io_end->inode)->i_ioend_count)) | |
74 | wake_up_all(ext4_ioend_wq(io_end->inode)); | |
75 | if (io_end->flag & EXT4_IO_END_DIRECT) | |
76 | inode_dio_done(io_end->inode); | |
77 | if (io_end->iocb) | |
78 | aio_complete(io_end->iocb, io_end->result, 0); | |
79 | kmem_cache_free(io_end_cachep, io_end); | |
80 | } | |
81 | ||
82 | static void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) | |
83 | { | |
84 | struct inode *inode = io_end->inode; | |
82e54229 | 85 | |
97a851ed JK |
86 | io_end->flag &= ~EXT4_IO_END_UNWRITTEN; |
87 | /* Wake up anyone waiting on unwritten extent conversion */ | |
88 | if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) | |
89 | wake_up_all(ext4_ioend_wq(inode)); | |
bd2d0210 TT |
90 | } |
91 | ||
28a535f9 DM |
92 | /* check a range of space and convert unwritten extents to written. */ |
93 | static int ext4_end_io(ext4_io_end_t *io) | |
bd2d0210 TT |
94 | { |
95 | struct inode *inode = io->inode; | |
96 | loff_t offset = io->offset; | |
97 | ssize_t size = io->size; | |
6b523df4 | 98 | handle_t *handle = io->handle; |
bd2d0210 TT |
99 | int ret = 0; |
100 | ||
101 | ext4_debug("ext4_end_io_nolock: io 0x%p from inode %lu,list->next 0x%p," | |
102 | "list->prev 0x%p\n", | |
103 | io, inode->i_ino, io->list.next, io->list.prev); | |
104 | ||
6b523df4 JK |
105 | io->handle = NULL; /* Following call will use up the handle */ |
106 | ret = ext4_convert_unwritten_extents(handle, inode, offset, size); | |
bd2d0210 | 107 | if (ret < 0) { |
b82e384c TT |
108 | ext4_msg(inode->i_sb, KERN_EMERG, |
109 | "failed to convert unwritten extents to written " | |
110 | "extents -- potential data loss! " | |
111 | "(inode %lu, offset %llu, size %zd, error %d)", | |
112 | inode->i_ino, offset, size, ret); | |
bd2d0210 | 113 | } |
97a851ed JK |
114 | ext4_clear_io_unwritten_flag(io); |
115 | ext4_release_io_end(io); | |
bd2d0210 TT |
116 | return ret; |
117 | } | |
118 | ||
2e8fa54e | 119 | static void dump_completed_IO(struct inode *inode, struct list_head *head) |
28a535f9 DM |
120 | { |
121 | #ifdef EXT4FS_DEBUG | |
122 | struct list_head *cur, *before, *after; | |
123 | ext4_io_end_t *io, *io0, *io1; | |
28a535f9 | 124 | |
2e8fa54e | 125 | if (list_empty(head)) |
28a535f9 | 126 | return; |
28a535f9 | 127 | |
2e8fa54e JK |
128 | ext4_debug("Dump inode %lu completed io list\n", inode->i_ino); |
129 | list_for_each_entry(io, head, list) { | |
28a535f9 DM |
130 | cur = &io->list; |
131 | before = cur->prev; | |
132 | io0 = container_of(before, ext4_io_end_t, list); | |
133 | after = cur->next; | |
134 | io1 = container_of(after, ext4_io_end_t, list); | |
135 | ||
136 | ext4_debug("io 0x%p from inode %lu,prev 0x%p,next 0x%p\n", | |
137 | io, inode->i_ino, io0, io1); | |
138 | } | |
139 | #endif | |
140 | } | |
141 | ||
142 | /* Add the io_end to per-inode completed end_io list. */ | |
97a851ed | 143 | static void ext4_add_complete_io(ext4_io_end_t *io_end) |
bd2d0210 | 144 | { |
28a535f9 DM |
145 | struct ext4_inode_info *ei = EXT4_I(io_end->inode); |
146 | struct workqueue_struct *wq; | |
147 | unsigned long flags; | |
148 | ||
149 | BUG_ON(!(io_end->flag & EXT4_IO_END_UNWRITTEN)); | |
d73d5046 | 150 | spin_lock_irqsave(&ei->i_completed_io_lock, flags); |
2e8fa54e JK |
151 | if (io_end->handle) { |
152 | wq = EXT4_SB(io_end->inode->i_sb)->rsv_conversion_wq; | |
153 | if (list_empty(&ei->i_rsv_conversion_list)) | |
154 | queue_work(wq, &ei->i_rsv_conversion_work); | |
155 | list_add_tail(&io_end->list, &ei->i_rsv_conversion_list); | |
156 | } else { | |
157 | wq = EXT4_SB(io_end->inode->i_sb)->unrsv_conversion_wq; | |
158 | if (list_empty(&ei->i_unrsv_conversion_list)) | |
159 | queue_work(wq, &ei->i_unrsv_conversion_work); | |
160 | list_add_tail(&io_end->list, &ei->i_unrsv_conversion_list); | |
161 | } | |
28a535f9 DM |
162 | spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); |
163 | } | |
d73d5046 | 164 | |
2e8fa54e JK |
165 | static int ext4_do_flush_completed_IO(struct inode *inode, |
166 | struct list_head *head) | |
28a535f9 DM |
167 | { |
168 | ext4_io_end_t *io; | |
002bd7fa | 169 | struct list_head unwritten; |
28a535f9 DM |
170 | unsigned long flags; |
171 | struct ext4_inode_info *ei = EXT4_I(inode); | |
172 | int err, ret = 0; | |
173 | ||
28a535f9 | 174 | spin_lock_irqsave(&ei->i_completed_io_lock, flags); |
2e8fa54e JK |
175 | dump_completed_IO(inode, head); |
176 | list_replace_init(head, &unwritten); | |
28a535f9 DM |
177 | spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); |
178 | ||
179 | while (!list_empty(&unwritten)) { | |
180 | io = list_entry(unwritten.next, ext4_io_end_t, list); | |
181 | BUG_ON(!(io->flag & EXT4_IO_END_UNWRITTEN)); | |
182 | list_del_init(&io->list); | |
183 | ||
184 | err = ext4_end_io(io); | |
185 | if (unlikely(!ret && err)) | |
186 | ret = err; | |
28a535f9 DM |
187 | } |
188 | return ret; | |
189 | } | |
190 | ||
191 | /* | |
2e8fa54e | 192 | * work on completed IO, to convert unwritten extents to extents |
28a535f9 | 193 | */ |
2e8fa54e JK |
194 | void ext4_end_io_rsv_work(struct work_struct *work) |
195 | { | |
196 | struct ext4_inode_info *ei = container_of(work, struct ext4_inode_info, | |
197 | i_rsv_conversion_work); | |
198 | ext4_do_flush_completed_IO(&ei->vfs_inode, &ei->i_rsv_conversion_list); | |
199 | } | |
200 | ||
201 | void ext4_end_io_unrsv_work(struct work_struct *work) | |
28a535f9 | 202 | { |
84c17543 | 203 | struct ext4_inode_info *ei = container_of(work, struct ext4_inode_info, |
2e8fa54e JK |
204 | i_unrsv_conversion_work); |
205 | ext4_do_flush_completed_IO(&ei->vfs_inode, &ei->i_unrsv_conversion_list); | |
28a535f9 DM |
206 | } |
207 | ||
c278531d | 208 | int ext4_flush_unwritten_io(struct inode *inode) |
28a535f9 | 209 | { |
2e8fa54e JK |
210 | int ret, err; |
211 | ||
c278531d DM |
212 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex) && |
213 | !(inode->i_state & I_FREEING)); | |
2e8fa54e JK |
214 | ret = ext4_do_flush_completed_IO(inode, |
215 | &EXT4_I(inode)->i_rsv_conversion_list); | |
216 | err = ext4_do_flush_completed_IO(inode, | |
217 | &EXT4_I(inode)->i_unrsv_conversion_list); | |
218 | if (!ret) | |
219 | ret = err; | |
c278531d DM |
220 | ext4_unwritten_wait(inode); |
221 | return ret; | |
bd2d0210 TT |
222 | } |
223 | ||
224 | ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags) | |
225 | { | |
b17b35ec | 226 | ext4_io_end_t *io = kmem_cache_zalloc(io_end_cachep, flags); |
bd2d0210 | 227 | if (io) { |
f7ad6d2e TT |
228 | atomic_inc(&EXT4_I(inode)->i_ioend_count); |
229 | io->inode = inode; | |
bd2d0210 | 230 | INIT_LIST_HEAD(&io->list); |
97a851ed | 231 | atomic_set(&io->count, 1); |
bd2d0210 TT |
232 | } |
233 | return io; | |
234 | } | |
235 | ||
97a851ed JK |
236 | void ext4_put_io_end_defer(ext4_io_end_t *io_end) |
237 | { | |
238 | if (atomic_dec_and_test(&io_end->count)) { | |
239 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN) || !io_end->size) { | |
240 | ext4_release_io_end(io_end); | |
241 | return; | |
242 | } | |
243 | ext4_add_complete_io(io_end); | |
244 | } | |
245 | } | |
246 | ||
247 | int ext4_put_io_end(ext4_io_end_t *io_end) | |
248 | { | |
249 | int err = 0; | |
250 | ||
251 | if (atomic_dec_and_test(&io_end->count)) { | |
252 | if (io_end->flag & EXT4_IO_END_UNWRITTEN) { | |
6b523df4 JK |
253 | err = ext4_convert_unwritten_extents(io_end->handle, |
254 | io_end->inode, io_end->offset, | |
255 | io_end->size); | |
256 | io_end->handle = NULL; | |
97a851ed JK |
257 | ext4_clear_io_unwritten_flag(io_end); |
258 | } | |
259 | ext4_release_io_end(io_end); | |
260 | } | |
261 | return err; | |
262 | } | |
263 | ||
264 | ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end) | |
265 | { | |
266 | atomic_inc(&io_end->count); | |
267 | return io_end; | |
268 | } | |
269 | ||
bd2d0210 TT |
270 | /* |
271 | * Print an buffer I/O error compatible with the fs/buffer.c. This | |
272 | * provides compatibility with dmesg scrapers that look for a specific | |
273 | * buffer I/O error message. We really need a unified error reporting | |
274 | * structure to userspace ala Digital Unix's uerf system, but it's | |
275 | * probably not going to happen in my lifetime, due to LKML politics... | |
276 | */ | |
277 | static void buffer_io_error(struct buffer_head *bh) | |
278 | { | |
279 | char b[BDEVNAME_SIZE]; | |
280 | printk(KERN_ERR "Buffer I/O error on device %s, logical block %llu\n", | |
281 | bdevname(bh->b_bdev, b), | |
282 | (unsigned long long)bh->b_blocknr); | |
283 | } | |
284 | ||
285 | static void ext4_end_bio(struct bio *bio, int error) | |
286 | { | |
287 | ext4_io_end_t *io_end = bio->bi_private; | |
bd2d0210 | 288 | struct inode *inode; |
bd2d0210 | 289 | int i; |
0058f965 | 290 | int blocksize; |
d50bdd5a | 291 | sector_t bi_sector = bio->bi_sector; |
bd2d0210 TT |
292 | |
293 | BUG_ON(!io_end); | |
0058f965 JK |
294 | inode = io_end->inode; |
295 | blocksize = 1 << inode->i_blkbits; | |
bd2d0210 TT |
296 | bio->bi_private = NULL; |
297 | bio->bi_end_io = NULL; | |
298 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
299 | error = 0; | |
0058f965 JK |
300 | for (i = 0; i < bio->bi_vcnt; i++) { |
301 | struct bio_vec *bvec = &bio->bi_io_vec[i]; | |
302 | struct page *page = bvec->bv_page; | |
bd2d0210 | 303 | struct buffer_head *bh, *head; |
0058f965 JK |
304 | unsigned bio_start = bvec->bv_offset; |
305 | unsigned bio_end = bio_start + bvec->bv_len; | |
306 | unsigned under_io = 0; | |
307 | unsigned long flags; | |
308 | ||
309 | if (!page) | |
310 | continue; | |
bd2d0210 | 311 | |
39db00f1 | 312 | if (error) { |
bd2d0210 | 313 | SetPageError(page); |
39db00f1 | 314 | set_bit(AS_EIO, &page->mapping->flags); |
bd2d0210 | 315 | } |
0058f965 JK |
316 | bh = head = page_buffers(page); |
317 | /* | |
318 | * We check all buffers in the page under BH_Uptodate_Lock | |
319 | * to avoid races with other end io clearing async_write flags | |
320 | */ | |
321 | local_irq_save(flags); | |
322 | bit_spin_lock(BH_Uptodate_Lock, &head->b_state); | |
323 | do { | |
324 | if (bh_offset(bh) < bio_start || | |
325 | bh_offset(bh) + blocksize > bio_end) { | |
326 | if (buffer_async_write(bh)) | |
327 | under_io++; | |
328 | continue; | |
329 | } | |
330 | clear_buffer_async_write(bh); | |
331 | if (error) | |
332 | buffer_io_error(bh); | |
333 | } while ((bh = bh->b_this_page) != head); | |
334 | bit_spin_unlock(BH_Uptodate_Lock, &head->b_state); | |
335 | local_irq_restore(flags); | |
336 | if (!under_io) | |
337 | end_page_writeback(page); | |
bd2d0210 | 338 | } |
0058f965 | 339 | bio_put(bio); |
f7ad6d2e TT |
340 | |
341 | if (error) { | |
342 | io_end->flag |= EXT4_IO_END_ERROR; | |
343 | ext4_warning(inode->i_sb, "I/O error writing to inode %lu " | |
344 | "(offset %llu size %ld starting block %llu)", | |
345 | inode->i_ino, | |
346 | (unsigned long long) io_end->offset, | |
347 | (long) io_end->size, | |
348 | (unsigned long long) | |
d50bdd5a | 349 | bi_sector >> (inode->i_blkbits - 9)); |
f7ad6d2e | 350 | } |
bd2d0210 | 351 | |
97a851ed | 352 | ext4_put_io_end_defer(io_end); |
bd2d0210 TT |
353 | } |
354 | ||
355 | void ext4_io_submit(struct ext4_io_submit *io) | |
356 | { | |
357 | struct bio *bio = io->io_bio; | |
358 | ||
359 | if (bio) { | |
360 | bio_get(io->io_bio); | |
361 | submit_bio(io->io_op, io->io_bio); | |
362 | BUG_ON(bio_flagged(io->io_bio, BIO_EOPNOTSUPP)); | |
363 | bio_put(io->io_bio); | |
364 | } | |
7dc57615 | 365 | io->io_bio = NULL; |
97a851ed JK |
366 | } |
367 | ||
368 | void ext4_io_submit_init(struct ext4_io_submit *io, | |
369 | struct writeback_control *wbc) | |
370 | { | |
371 | io->io_op = (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE); | |
372 | io->io_bio = NULL; | |
7dc57615 | 373 | io->io_end = NULL; |
bd2d0210 TT |
374 | } |
375 | ||
97a851ed JK |
376 | static int io_submit_init_bio(struct ext4_io_submit *io, |
377 | struct buffer_head *bh) | |
bd2d0210 | 378 | { |
bd2d0210 TT |
379 | int nvecs = bio_get_nr_vecs(bh->b_bdev); |
380 | struct bio *bio; | |
381 | ||
275d3ba6 | 382 | bio = bio_alloc(GFP_NOIO, min(nvecs, BIO_MAX_PAGES)); |
bd2d0210 TT |
383 | bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9); |
384 | bio->bi_bdev = bh->b_bdev; | |
bd2d0210 | 385 | bio->bi_end_io = ext4_end_bio; |
97a851ed | 386 | bio->bi_private = ext4_get_io_end(io->io_end); |
bd2d0210 | 387 | io->io_bio = bio; |
bd2d0210 TT |
388 | io->io_next_block = bh->b_blocknr; |
389 | return 0; | |
390 | } | |
391 | ||
392 | static int io_submit_add_bh(struct ext4_io_submit *io, | |
bd2d0210 | 393 | struct inode *inode, |
bd2d0210 TT |
394 | struct buffer_head *bh) |
395 | { | |
bd2d0210 TT |
396 | int ret; |
397 | ||
bd2d0210 TT |
398 | if (io->io_bio && bh->b_blocknr != io->io_next_block) { |
399 | submit_and_retry: | |
400 | ext4_io_submit(io); | |
401 | } | |
402 | if (io->io_bio == NULL) { | |
97a851ed | 403 | ret = io_submit_init_bio(io, bh); |
bd2d0210 TT |
404 | if (ret) |
405 | return ret; | |
406 | } | |
97a851ed JK |
407 | ret = bio_add_page(io->io_bio, bh->b_page, bh->b_size, bh_offset(bh)); |
408 | if (ret != bh->b_size) | |
409 | goto submit_and_retry; | |
bd2d0210 | 410 | io->io_next_block++; |
bd2d0210 TT |
411 | return 0; |
412 | } | |
413 | ||
414 | int ext4_bio_write_page(struct ext4_io_submit *io, | |
415 | struct page *page, | |
416 | int len, | |
417 | struct writeback_control *wbc) | |
418 | { | |
419 | struct inode *inode = page->mapping->host; | |
0058f965 | 420 | unsigned block_start, blocksize; |
bd2d0210 TT |
421 | struct buffer_head *bh, *head; |
422 | int ret = 0; | |
0058f965 | 423 | int nr_submitted = 0; |
bd2d0210 TT |
424 | |
425 | blocksize = 1 << inode->i_blkbits; | |
426 | ||
d50bdd5a | 427 | BUG_ON(!PageLocked(page)); |
bd2d0210 | 428 | BUG_ON(PageWriteback(page)); |
bd2d0210 | 429 | |
a54aa761 TT |
430 | set_page_writeback(page); |
431 | ClearPageError(page); | |
bd2d0210 | 432 | |
0058f965 JK |
433 | /* |
434 | * In the first loop we prepare and mark buffers to submit. We have to | |
435 | * mark all buffers in the page before submitting so that | |
436 | * end_page_writeback() cannot be called from ext4_bio_end_io() when IO | |
437 | * on the first buffer finishes and we are still working on submitting | |
438 | * the second buffer. | |
439 | */ | |
440 | bh = head = page_buffers(page); | |
441 | do { | |
442 | block_start = bh_offset(bh); | |
bd2d0210 | 443 | if (block_start >= len) { |
5a0dc736 YY |
444 | /* |
445 | * Comments copied from block_write_full_page_endio: | |
446 | * | |
447 | * The page straddles i_size. It must be zeroed out on | |
448 | * each and every writepage invocation because it may | |
449 | * be mmapped. "A file is mapped in multiples of the | |
450 | * page size. For a file that is not a multiple of | |
451 | * the page size, the remaining memory is zeroed when | |
452 | * mapped, and writes to that region are not written | |
453 | * out to the file." | |
454 | */ | |
0058f965 JK |
455 | zero_user_segment(page, block_start, |
456 | block_start + blocksize); | |
bd2d0210 TT |
457 | clear_buffer_dirty(bh); |
458 | set_buffer_uptodate(bh); | |
459 | continue; | |
460 | } | |
8a850c3f JK |
461 | if (!buffer_dirty(bh) || buffer_delay(bh) || |
462 | !buffer_mapped(bh) || buffer_unwritten(bh)) { | |
463 | /* A hole? We can safely clear the dirty bit */ | |
464 | if (!buffer_mapped(bh)) | |
465 | clear_buffer_dirty(bh); | |
466 | if (io->io_bio) | |
467 | ext4_io_submit(io); | |
468 | continue; | |
469 | } | |
0058f965 JK |
470 | if (buffer_new(bh)) { |
471 | clear_buffer_new(bh); | |
472 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); | |
473 | } | |
474 | set_buffer_async_write(bh); | |
475 | } while ((bh = bh->b_this_page) != head); | |
476 | ||
477 | /* Now submit buffers to write */ | |
478 | bh = head = page_buffers(page); | |
479 | do { | |
480 | if (!buffer_async_write(bh)) | |
481 | continue; | |
97a851ed | 482 | ret = io_submit_add_bh(io, inode, bh); |
bd2d0210 TT |
483 | if (ret) { |
484 | /* | |
485 | * We only get here on ENOMEM. Not much else | |
486 | * we can do but mark the page as dirty, and | |
487 | * better luck next time. | |
488 | */ | |
1ae48a63 | 489 | redirty_page_for_writepage(wbc, page); |
bd2d0210 TT |
490 | break; |
491 | } | |
0058f965 | 492 | nr_submitted++; |
1ae48a63 | 493 | clear_buffer_dirty(bh); |
0058f965 JK |
494 | } while ((bh = bh->b_this_page) != head); |
495 | ||
496 | /* Error stopped previous loop? Clean up buffers... */ | |
497 | if (ret) { | |
498 | do { | |
499 | clear_buffer_async_write(bh); | |
500 | bh = bh->b_this_page; | |
501 | } while (bh != head); | |
bd2d0210 TT |
502 | } |
503 | unlock_page(page); | |
0058f965 JK |
504 | /* Nothing submitted - we have to end page writeback */ |
505 | if (!nr_submitted) | |
506 | end_page_writeback(page); | |
bd2d0210 TT |
507 | return ret; |
508 | } |