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 | ||
b0857d30 JK |
67 | /* |
68 | * Print an buffer I/O error compatible with the fs/buffer.c. This | |
69 | * provides compatibility with dmesg scrapers that look for a specific | |
70 | * buffer I/O error message. We really need a unified error reporting | |
71 | * structure to userspace ala Digital Unix's uerf system, but it's | |
72 | * probably not going to happen in my lifetime, due to LKML politics... | |
73 | */ | |
74 | static void buffer_io_error(struct buffer_head *bh) | |
75 | { | |
76 | char b[BDEVNAME_SIZE]; | |
77 | printk(KERN_ERR "Buffer I/O error on device %s, logical block %llu\n", | |
78 | bdevname(bh->b_bdev, b), | |
79 | (unsigned long long)bh->b_blocknr); | |
80 | } | |
81 | ||
82 | static void ext4_finish_bio(struct bio *bio) | |
83 | { | |
84 | int i; | |
85 | int error = !test_bit(BIO_UPTODATE, &bio->bi_flags); | |
86 | ||
87 | for (i = 0; i < bio->bi_vcnt; i++) { | |
88 | struct bio_vec *bvec = &bio->bi_io_vec[i]; | |
89 | struct page *page = bvec->bv_page; | |
90 | struct buffer_head *bh, *head; | |
91 | unsigned bio_start = bvec->bv_offset; | |
92 | unsigned bio_end = bio_start + bvec->bv_len; | |
93 | unsigned under_io = 0; | |
94 | unsigned long flags; | |
95 | ||
96 | if (!page) | |
97 | continue; | |
98 | ||
99 | if (error) { | |
100 | SetPageError(page); | |
101 | set_bit(AS_EIO, &page->mapping->flags); | |
102 | } | |
103 | bh = head = page_buffers(page); | |
104 | /* | |
105 | * We check all buffers in the page under BH_Uptodate_Lock | |
106 | * to avoid races with other end io clearing async_write flags | |
107 | */ | |
108 | local_irq_save(flags); | |
109 | bit_spin_lock(BH_Uptodate_Lock, &head->b_state); | |
110 | do { | |
111 | if (bh_offset(bh) < bio_start || | |
112 | bh_offset(bh) + bh->b_size > bio_end) { | |
113 | if (buffer_async_write(bh)) | |
114 | under_io++; | |
115 | continue; | |
116 | } | |
117 | clear_buffer_async_write(bh); | |
118 | if (error) | |
119 | buffer_io_error(bh); | |
120 | } while ((bh = bh->b_this_page) != head); | |
121 | bit_spin_unlock(BH_Uptodate_Lock, &head->b_state); | |
122 | local_irq_restore(flags); | |
123 | if (!under_io) | |
124 | end_page_writeback(page); | |
125 | } | |
126 | } | |
127 | ||
97a851ed | 128 | static void ext4_release_io_end(ext4_io_end_t *io_end) |
bd2d0210 | 129 | { |
b0857d30 JK |
130 | struct bio *bio, *next_bio; |
131 | ||
97a851ed JK |
132 | BUG_ON(!list_empty(&io_end->list)); |
133 | BUG_ON(io_end->flag & EXT4_IO_END_UNWRITTEN); | |
6b523df4 | 134 | WARN_ON(io_end->handle); |
97a851ed JK |
135 | |
136 | if (atomic_dec_and_test(&EXT4_I(io_end->inode)->i_ioend_count)) | |
137 | wake_up_all(ext4_ioend_wq(io_end->inode)); | |
b0857d30 JK |
138 | |
139 | for (bio = io_end->bio; bio; bio = next_bio) { | |
140 | next_bio = bio->bi_private; | |
141 | ext4_finish_bio(bio); | |
142 | bio_put(bio); | |
143 | } | |
97a851ed JK |
144 | if (io_end->flag & EXT4_IO_END_DIRECT) |
145 | inode_dio_done(io_end->inode); | |
146 | if (io_end->iocb) | |
147 | aio_complete(io_end->iocb, io_end->result, 0); | |
148 | kmem_cache_free(io_end_cachep, io_end); | |
149 | } | |
150 | ||
151 | static void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) | |
152 | { | |
153 | struct inode *inode = io_end->inode; | |
82e54229 | 154 | |
97a851ed JK |
155 | io_end->flag &= ~EXT4_IO_END_UNWRITTEN; |
156 | /* Wake up anyone waiting on unwritten extent conversion */ | |
157 | if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) | |
158 | wake_up_all(ext4_ioend_wq(inode)); | |
bd2d0210 TT |
159 | } |
160 | ||
28a535f9 DM |
161 | /* check a range of space and convert unwritten extents to written. */ |
162 | static int ext4_end_io(ext4_io_end_t *io) | |
bd2d0210 TT |
163 | { |
164 | struct inode *inode = io->inode; | |
165 | loff_t offset = io->offset; | |
166 | ssize_t size = io->size; | |
6b523df4 | 167 | handle_t *handle = io->handle; |
bd2d0210 TT |
168 | int ret = 0; |
169 | ||
170 | ext4_debug("ext4_end_io_nolock: io 0x%p from inode %lu,list->next 0x%p," | |
171 | "list->prev 0x%p\n", | |
172 | io, inode->i_ino, io->list.next, io->list.prev); | |
173 | ||
6b523df4 JK |
174 | io->handle = NULL; /* Following call will use up the handle */ |
175 | ret = ext4_convert_unwritten_extents(handle, inode, offset, size); | |
bd2d0210 | 176 | if (ret < 0) { |
b82e384c TT |
177 | ext4_msg(inode->i_sb, KERN_EMERG, |
178 | "failed to convert unwritten extents to written " | |
179 | "extents -- potential data loss! " | |
180 | "(inode %lu, offset %llu, size %zd, error %d)", | |
181 | inode->i_ino, offset, size, ret); | |
bd2d0210 | 182 | } |
97a851ed JK |
183 | ext4_clear_io_unwritten_flag(io); |
184 | ext4_release_io_end(io); | |
bd2d0210 TT |
185 | return ret; |
186 | } | |
187 | ||
2e8fa54e | 188 | static void dump_completed_IO(struct inode *inode, struct list_head *head) |
28a535f9 DM |
189 | { |
190 | #ifdef EXT4FS_DEBUG | |
191 | struct list_head *cur, *before, *after; | |
192 | ext4_io_end_t *io, *io0, *io1; | |
28a535f9 | 193 | |
2e8fa54e | 194 | if (list_empty(head)) |
28a535f9 | 195 | return; |
28a535f9 | 196 | |
2e8fa54e JK |
197 | ext4_debug("Dump inode %lu completed io list\n", inode->i_ino); |
198 | list_for_each_entry(io, head, list) { | |
28a535f9 DM |
199 | cur = &io->list; |
200 | before = cur->prev; | |
201 | io0 = container_of(before, ext4_io_end_t, list); | |
202 | after = cur->next; | |
203 | io1 = container_of(after, ext4_io_end_t, list); | |
204 | ||
205 | ext4_debug("io 0x%p from inode %lu,prev 0x%p,next 0x%p\n", | |
206 | io, inode->i_ino, io0, io1); | |
207 | } | |
208 | #endif | |
209 | } | |
210 | ||
211 | /* Add the io_end to per-inode completed end_io list. */ | |
97a851ed | 212 | static void ext4_add_complete_io(ext4_io_end_t *io_end) |
bd2d0210 | 213 | { |
28a535f9 DM |
214 | struct ext4_inode_info *ei = EXT4_I(io_end->inode); |
215 | struct workqueue_struct *wq; | |
216 | unsigned long flags; | |
217 | ||
218 | BUG_ON(!(io_end->flag & EXT4_IO_END_UNWRITTEN)); | |
d73d5046 | 219 | spin_lock_irqsave(&ei->i_completed_io_lock, flags); |
2e8fa54e JK |
220 | if (io_end->handle) { |
221 | wq = EXT4_SB(io_end->inode->i_sb)->rsv_conversion_wq; | |
222 | if (list_empty(&ei->i_rsv_conversion_list)) | |
223 | queue_work(wq, &ei->i_rsv_conversion_work); | |
224 | list_add_tail(&io_end->list, &ei->i_rsv_conversion_list); | |
225 | } else { | |
226 | wq = EXT4_SB(io_end->inode->i_sb)->unrsv_conversion_wq; | |
227 | if (list_empty(&ei->i_unrsv_conversion_list)) | |
228 | queue_work(wq, &ei->i_unrsv_conversion_work); | |
229 | list_add_tail(&io_end->list, &ei->i_unrsv_conversion_list); | |
230 | } | |
28a535f9 DM |
231 | spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); |
232 | } | |
d73d5046 | 233 | |
2e8fa54e JK |
234 | static int ext4_do_flush_completed_IO(struct inode *inode, |
235 | struct list_head *head) | |
28a535f9 DM |
236 | { |
237 | ext4_io_end_t *io; | |
002bd7fa | 238 | struct list_head unwritten; |
28a535f9 DM |
239 | unsigned long flags; |
240 | struct ext4_inode_info *ei = EXT4_I(inode); | |
241 | int err, ret = 0; | |
242 | ||
28a535f9 | 243 | spin_lock_irqsave(&ei->i_completed_io_lock, flags); |
2e8fa54e JK |
244 | dump_completed_IO(inode, head); |
245 | list_replace_init(head, &unwritten); | |
28a535f9 DM |
246 | spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); |
247 | ||
248 | while (!list_empty(&unwritten)) { | |
249 | io = list_entry(unwritten.next, ext4_io_end_t, list); | |
250 | BUG_ON(!(io->flag & EXT4_IO_END_UNWRITTEN)); | |
251 | list_del_init(&io->list); | |
252 | ||
253 | err = ext4_end_io(io); | |
254 | if (unlikely(!ret && err)) | |
255 | ret = err; | |
28a535f9 DM |
256 | } |
257 | return ret; | |
258 | } | |
259 | ||
260 | /* | |
2e8fa54e | 261 | * work on completed IO, to convert unwritten extents to extents |
28a535f9 | 262 | */ |
2e8fa54e JK |
263 | void ext4_end_io_rsv_work(struct work_struct *work) |
264 | { | |
265 | struct ext4_inode_info *ei = container_of(work, struct ext4_inode_info, | |
266 | i_rsv_conversion_work); | |
267 | ext4_do_flush_completed_IO(&ei->vfs_inode, &ei->i_rsv_conversion_list); | |
268 | } | |
269 | ||
270 | void ext4_end_io_unrsv_work(struct work_struct *work) | |
28a535f9 | 271 | { |
84c17543 | 272 | struct ext4_inode_info *ei = container_of(work, struct ext4_inode_info, |
2e8fa54e JK |
273 | i_unrsv_conversion_work); |
274 | ext4_do_flush_completed_IO(&ei->vfs_inode, &ei->i_unrsv_conversion_list); | |
28a535f9 DM |
275 | } |
276 | ||
c278531d | 277 | int ext4_flush_unwritten_io(struct inode *inode) |
28a535f9 | 278 | { |
2e8fa54e JK |
279 | int ret, err; |
280 | ||
c278531d DM |
281 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex) && |
282 | !(inode->i_state & I_FREEING)); | |
2e8fa54e JK |
283 | ret = ext4_do_flush_completed_IO(inode, |
284 | &EXT4_I(inode)->i_rsv_conversion_list); | |
285 | err = ext4_do_flush_completed_IO(inode, | |
286 | &EXT4_I(inode)->i_unrsv_conversion_list); | |
287 | if (!ret) | |
288 | ret = err; | |
c278531d DM |
289 | ext4_unwritten_wait(inode); |
290 | return ret; | |
bd2d0210 TT |
291 | } |
292 | ||
293 | ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags) | |
294 | { | |
b17b35ec | 295 | ext4_io_end_t *io = kmem_cache_zalloc(io_end_cachep, flags); |
bd2d0210 | 296 | if (io) { |
f7ad6d2e TT |
297 | atomic_inc(&EXT4_I(inode)->i_ioend_count); |
298 | io->inode = inode; | |
bd2d0210 | 299 | INIT_LIST_HEAD(&io->list); |
97a851ed | 300 | atomic_set(&io->count, 1); |
bd2d0210 TT |
301 | } |
302 | return io; | |
303 | } | |
304 | ||
97a851ed JK |
305 | void ext4_put_io_end_defer(ext4_io_end_t *io_end) |
306 | { | |
307 | if (atomic_dec_and_test(&io_end->count)) { | |
308 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN) || !io_end->size) { | |
309 | ext4_release_io_end(io_end); | |
310 | return; | |
311 | } | |
312 | ext4_add_complete_io(io_end); | |
313 | } | |
314 | } | |
315 | ||
316 | int ext4_put_io_end(ext4_io_end_t *io_end) | |
317 | { | |
318 | int err = 0; | |
319 | ||
320 | if (atomic_dec_and_test(&io_end->count)) { | |
321 | if (io_end->flag & EXT4_IO_END_UNWRITTEN) { | |
6b523df4 JK |
322 | err = ext4_convert_unwritten_extents(io_end->handle, |
323 | io_end->inode, io_end->offset, | |
324 | io_end->size); | |
325 | io_end->handle = NULL; | |
97a851ed JK |
326 | ext4_clear_io_unwritten_flag(io_end); |
327 | } | |
328 | ext4_release_io_end(io_end); | |
329 | } | |
330 | return err; | |
331 | } | |
332 | ||
333 | ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end) | |
334 | { | |
335 | atomic_inc(&io_end->count); | |
336 | return io_end; | |
337 | } | |
338 | ||
bd2d0210 TT |
339 | static void ext4_end_bio(struct bio *bio, int error) |
340 | { | |
341 | ext4_io_end_t *io_end = bio->bi_private; | |
d50bdd5a | 342 | sector_t bi_sector = bio->bi_sector; |
bd2d0210 TT |
343 | |
344 | BUG_ON(!io_end); | |
bd2d0210 TT |
345 | bio->bi_end_io = NULL; |
346 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
347 | error = 0; | |
0058f965 | 348 | |
b0857d30 | 349 | if (io_end->flag & EXT4_IO_END_UNWRITTEN) { |
0058f965 | 350 | /* |
b0857d30 JK |
351 | * Link bio into list hanging from io_end. We have to do it |
352 | * atomically as bio completions can be racing against each | |
353 | * other. | |
0058f965 | 354 | */ |
b0857d30 JK |
355 | bio->bi_private = xchg(&io_end->bio, bio); |
356 | } else { | |
357 | ext4_finish_bio(bio); | |
358 | bio_put(bio); | |
bd2d0210 | 359 | } |
f7ad6d2e TT |
360 | |
361 | if (error) { | |
b0857d30 JK |
362 | struct inode *inode = io_end->inode; |
363 | ||
f7ad6d2e TT |
364 | ext4_warning(inode->i_sb, "I/O error writing to inode %lu " |
365 | "(offset %llu size %ld starting block %llu)", | |
366 | inode->i_ino, | |
367 | (unsigned long long) io_end->offset, | |
368 | (long) io_end->size, | |
369 | (unsigned long long) | |
d50bdd5a | 370 | bi_sector >> (inode->i_blkbits - 9)); |
f7ad6d2e | 371 | } |
97a851ed | 372 | ext4_put_io_end_defer(io_end); |
bd2d0210 TT |
373 | } |
374 | ||
375 | void ext4_io_submit(struct ext4_io_submit *io) | |
376 | { | |
377 | struct bio *bio = io->io_bio; | |
378 | ||
379 | if (bio) { | |
380 | bio_get(io->io_bio); | |
381 | submit_bio(io->io_op, io->io_bio); | |
382 | BUG_ON(bio_flagged(io->io_bio, BIO_EOPNOTSUPP)); | |
383 | bio_put(io->io_bio); | |
384 | } | |
7dc57615 | 385 | io->io_bio = NULL; |
97a851ed JK |
386 | } |
387 | ||
388 | void ext4_io_submit_init(struct ext4_io_submit *io, | |
389 | struct writeback_control *wbc) | |
390 | { | |
391 | io->io_op = (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE); | |
392 | io->io_bio = NULL; | |
7dc57615 | 393 | io->io_end = NULL; |
bd2d0210 TT |
394 | } |
395 | ||
97a851ed JK |
396 | static int io_submit_init_bio(struct ext4_io_submit *io, |
397 | struct buffer_head *bh) | |
bd2d0210 | 398 | { |
bd2d0210 TT |
399 | int nvecs = bio_get_nr_vecs(bh->b_bdev); |
400 | struct bio *bio; | |
401 | ||
275d3ba6 | 402 | bio = bio_alloc(GFP_NOIO, min(nvecs, BIO_MAX_PAGES)); |
bd2d0210 TT |
403 | bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9); |
404 | bio->bi_bdev = bh->b_bdev; | |
bd2d0210 | 405 | bio->bi_end_io = ext4_end_bio; |
97a851ed | 406 | bio->bi_private = ext4_get_io_end(io->io_end); |
bd2d0210 | 407 | io->io_bio = bio; |
bd2d0210 TT |
408 | io->io_next_block = bh->b_blocknr; |
409 | return 0; | |
410 | } | |
411 | ||
412 | static int io_submit_add_bh(struct ext4_io_submit *io, | |
bd2d0210 | 413 | struct inode *inode, |
bd2d0210 TT |
414 | struct buffer_head *bh) |
415 | { | |
bd2d0210 TT |
416 | int ret; |
417 | ||
bd2d0210 TT |
418 | if (io->io_bio && bh->b_blocknr != io->io_next_block) { |
419 | submit_and_retry: | |
420 | ext4_io_submit(io); | |
421 | } | |
422 | if (io->io_bio == NULL) { | |
97a851ed | 423 | ret = io_submit_init_bio(io, bh); |
bd2d0210 TT |
424 | if (ret) |
425 | return ret; | |
426 | } | |
97a851ed JK |
427 | ret = bio_add_page(io->io_bio, bh->b_page, bh->b_size, bh_offset(bh)); |
428 | if (ret != bh->b_size) | |
429 | goto submit_and_retry; | |
bd2d0210 | 430 | io->io_next_block++; |
bd2d0210 TT |
431 | return 0; |
432 | } | |
433 | ||
434 | int ext4_bio_write_page(struct ext4_io_submit *io, | |
435 | struct page *page, | |
436 | int len, | |
437 | struct writeback_control *wbc) | |
438 | { | |
439 | struct inode *inode = page->mapping->host; | |
0058f965 | 440 | unsigned block_start, blocksize; |
bd2d0210 TT |
441 | struct buffer_head *bh, *head; |
442 | int ret = 0; | |
0058f965 | 443 | int nr_submitted = 0; |
bd2d0210 TT |
444 | |
445 | blocksize = 1 << inode->i_blkbits; | |
446 | ||
d50bdd5a | 447 | BUG_ON(!PageLocked(page)); |
bd2d0210 | 448 | BUG_ON(PageWriteback(page)); |
bd2d0210 | 449 | |
a54aa761 TT |
450 | set_page_writeback(page); |
451 | ClearPageError(page); | |
bd2d0210 | 452 | |
0058f965 JK |
453 | /* |
454 | * In the first loop we prepare and mark buffers to submit. We have to | |
455 | * mark all buffers in the page before submitting so that | |
456 | * end_page_writeback() cannot be called from ext4_bio_end_io() when IO | |
457 | * on the first buffer finishes and we are still working on submitting | |
458 | * the second buffer. | |
459 | */ | |
460 | bh = head = page_buffers(page); | |
461 | do { | |
462 | block_start = bh_offset(bh); | |
bd2d0210 | 463 | if (block_start >= len) { |
5a0dc736 YY |
464 | /* |
465 | * Comments copied from block_write_full_page_endio: | |
466 | * | |
467 | * The page straddles i_size. It must be zeroed out on | |
468 | * each and every writepage invocation because it may | |
469 | * be mmapped. "A file is mapped in multiples of the | |
470 | * page size. For a file that is not a multiple of | |
471 | * the page size, the remaining memory is zeroed when | |
472 | * mapped, and writes to that region are not written | |
473 | * out to the file." | |
474 | */ | |
0058f965 JK |
475 | zero_user_segment(page, block_start, |
476 | block_start + blocksize); | |
bd2d0210 TT |
477 | clear_buffer_dirty(bh); |
478 | set_buffer_uptodate(bh); | |
479 | continue; | |
480 | } | |
8a850c3f JK |
481 | if (!buffer_dirty(bh) || buffer_delay(bh) || |
482 | !buffer_mapped(bh) || buffer_unwritten(bh)) { | |
483 | /* A hole? We can safely clear the dirty bit */ | |
484 | if (!buffer_mapped(bh)) | |
485 | clear_buffer_dirty(bh); | |
486 | if (io->io_bio) | |
487 | ext4_io_submit(io); | |
488 | continue; | |
489 | } | |
0058f965 JK |
490 | if (buffer_new(bh)) { |
491 | clear_buffer_new(bh); | |
492 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); | |
493 | } | |
494 | set_buffer_async_write(bh); | |
495 | } while ((bh = bh->b_this_page) != head); | |
496 | ||
497 | /* Now submit buffers to write */ | |
498 | bh = head = page_buffers(page); | |
499 | do { | |
500 | if (!buffer_async_write(bh)) | |
501 | continue; | |
97a851ed | 502 | ret = io_submit_add_bh(io, inode, bh); |
bd2d0210 TT |
503 | if (ret) { |
504 | /* | |
505 | * We only get here on ENOMEM. Not much else | |
506 | * we can do but mark the page as dirty, and | |
507 | * better luck next time. | |
508 | */ | |
1ae48a63 | 509 | redirty_page_for_writepage(wbc, page); |
bd2d0210 TT |
510 | break; |
511 | } | |
0058f965 | 512 | nr_submitted++; |
1ae48a63 | 513 | clear_buffer_dirty(bh); |
0058f965 JK |
514 | } while ((bh = bh->b_this_page) != head); |
515 | ||
516 | /* Error stopped previous loop? Clean up buffers... */ | |
517 | if (ret) { | |
518 | do { | |
519 | clear_buffer_async_write(bh); | |
520 | bh = bh->b_this_page; | |
521 | } while (bh != head); | |
bd2d0210 TT |
522 | } |
523 | unlock_page(page); | |
0058f965 JK |
524 | /* Nothing submitted - we have to end page writeback */ |
525 | if (!nr_submitted) | |
526 | end_page_writeback(page); | |
bd2d0210 TT |
527 | return ret; |
528 | } |