Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
bd2d0210 TT |
2 | /* |
3 | * linux/fs/ext4/page-io.c | |
4 | * | |
5 | * This contains the new page_io functions for ext4 | |
6 | * | |
7 | * Written by Theodore Ts'o, 2010. | |
8 | */ | |
9 | ||
bd2d0210 TT |
10 | #include <linux/fs.h> |
11 | #include <linux/time.h> | |
bd2d0210 TT |
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> | |
21 | #include <linux/uio.h> | |
22 | #include <linux/bio.h> | |
23 | #include <linux/workqueue.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/slab.h> | |
1ae48a63 | 26 | #include <linux/mm.h> |
c9af28fd | 27 | #include <linux/backing-dev.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 | ||
b0857d30 JK |
48 | /* |
49 | * Print an buffer I/O error compatible with the fs/buffer.c. This | |
50 | * provides compatibility with dmesg scrapers that look for a specific | |
51 | * buffer I/O error message. We really need a unified error reporting | |
52 | * structure to userspace ala Digital Unix's uerf system, but it's | |
53 | * probably not going to happen in my lifetime, due to LKML politics... | |
54 | */ | |
55 | static void buffer_io_error(struct buffer_head *bh) | |
56 | { | |
a1c6f057 DM |
57 | printk_ratelimited(KERN_ERR "Buffer I/O error on device %pg, logical block %llu\n", |
58 | bh->b_bdev, | |
b0857d30 JK |
59 | (unsigned long long)bh->b_blocknr); |
60 | } | |
61 | ||
62 | static void ext4_finish_bio(struct bio *bio) | |
63 | { | |
64 | int i; | |
2c30c71b | 65 | struct bio_vec *bvec; |
b0857d30 | 66 | |
2c30c71b | 67 | bio_for_each_segment_all(bvec, bio, i) { |
b0857d30 | 68 | struct page *page = bvec->bv_page; |
2058f83a MH |
69 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
70 | struct page *data_page = NULL; | |
2058f83a | 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; | |
a7550b30 | 85 | fscrypt_pullback_bio_page(&page, false); |
2058f83a MH |
86 | } |
87 | #endif | |
88 | ||
4e4cbee9 | 89 | if (bio->bi_status) { |
b0857d30 | 90 | SetPageError(page); |
5114a97a | 91 | mapping_set_error(page->mapping, -EIO); |
b0857d30 JK |
92 | } |
93 | bh = head = page_buffers(page); | |
94 | /* | |
95 | * We check all buffers in the page under BH_Uptodate_Lock | |
96 | * to avoid races with other end io clearing async_write flags | |
97 | */ | |
98 | local_irq_save(flags); | |
99 | bit_spin_lock(BH_Uptodate_Lock, &head->b_state); | |
100 | do { | |
101 | if (bh_offset(bh) < bio_start || | |
102 | bh_offset(bh) + bh->b_size > bio_end) { | |
103 | if (buffer_async_write(bh)) | |
104 | under_io++; | |
105 | continue; | |
106 | } | |
107 | clear_buffer_async_write(bh); | |
4e4cbee9 | 108 | if (bio->bi_status) |
b0857d30 JK |
109 | buffer_io_error(bh); |
110 | } while ((bh = bh->b_this_page) != head); | |
111 | bit_spin_unlock(BH_Uptodate_Lock, &head->b_state); | |
112 | local_irq_restore(flags); | |
2058f83a MH |
113 | if (!under_io) { |
114 | #ifdef CONFIG_EXT4_FS_ENCRYPTION | |
a7550b30 JK |
115 | if (data_page) |
116 | fscrypt_restore_control_page(data_page); | |
2058f83a | 117 | #endif |
b0857d30 | 118 | end_page_writeback(page); |
2058f83a | 119 | } |
b0857d30 JK |
120 | } |
121 | } | |
122 | ||
97a851ed | 123 | static void ext4_release_io_end(ext4_io_end_t *io_end) |
bd2d0210 | 124 | { |
b0857d30 JK |
125 | struct bio *bio, *next_bio; |
126 | ||
97a851ed JK |
127 | BUG_ON(!list_empty(&io_end->list)); |
128 | BUG_ON(io_end->flag & EXT4_IO_END_UNWRITTEN); | |
6b523df4 | 129 | WARN_ON(io_end->handle); |
97a851ed | 130 | |
b0857d30 JK |
131 | for (bio = io_end->bio; bio; bio = next_bio) { |
132 | next_bio = bio->bi_private; | |
133 | ext4_finish_bio(bio); | |
134 | bio_put(bio); | |
135 | } | |
97a851ed JK |
136 | kmem_cache_free(io_end_cachep, io_end); |
137 | } | |
138 | ||
a115f749 JK |
139 | /* |
140 | * Check a range of space and convert unwritten extents to written. Note that | |
141 | * we are protected from truncate touching same part of extent tree by the | |
142 | * fact that truncate code waits for all DIO to finish (thus exclusion from | |
143 | * direct IO is achieved) and also waits for PageWriteback bits. Thus we | |
144 | * cannot get to ext4_ext_truncate() before all IOs overlapping that range are | |
145 | * completed (happens from ext4_free_ioend()). | |
146 | */ | |
28a535f9 | 147 | static int ext4_end_io(ext4_io_end_t *io) |
bd2d0210 TT |
148 | { |
149 | struct inode *inode = io->inode; | |
150 | loff_t offset = io->offset; | |
151 | ssize_t size = io->size; | |
6b523df4 | 152 | handle_t *handle = io->handle; |
bd2d0210 TT |
153 | int ret = 0; |
154 | ||
155 | ext4_debug("ext4_end_io_nolock: io 0x%p from inode %lu,list->next 0x%p," | |
156 | "list->prev 0x%p\n", | |
157 | io, inode->i_ino, io->list.next, io->list.prev); | |
158 | ||
6b523df4 JK |
159 | io->handle = NULL; /* Following call will use up the handle */ |
160 | ret = ext4_convert_unwritten_extents(handle, inode, offset, size); | |
0db1ff22 | 161 | if (ret < 0 && !ext4_forced_shutdown(EXT4_SB(inode->i_sb))) { |
b82e384c TT |
162 | ext4_msg(inode->i_sb, KERN_EMERG, |
163 | "failed to convert unwritten extents to written " | |
164 | "extents -- potential data loss! " | |
165 | "(inode %lu, offset %llu, size %zd, error %d)", | |
166 | inode->i_ino, offset, size, ret); | |
bd2d0210 | 167 | } |
97a851ed JK |
168 | ext4_clear_io_unwritten_flag(io); |
169 | ext4_release_io_end(io); | |
bd2d0210 TT |
170 | return ret; |
171 | } | |
172 | ||
2e8fa54e | 173 | static void dump_completed_IO(struct inode *inode, struct list_head *head) |
28a535f9 DM |
174 | { |
175 | #ifdef EXT4FS_DEBUG | |
176 | struct list_head *cur, *before, *after; | |
177 | ext4_io_end_t *io, *io0, *io1; | |
28a535f9 | 178 | |
2e8fa54e | 179 | if (list_empty(head)) |
28a535f9 | 180 | return; |
28a535f9 | 181 | |
2e8fa54e JK |
182 | ext4_debug("Dump inode %lu completed io list\n", inode->i_ino); |
183 | list_for_each_entry(io, head, list) { | |
28a535f9 DM |
184 | cur = &io->list; |
185 | before = cur->prev; | |
186 | io0 = container_of(before, ext4_io_end_t, list); | |
187 | after = cur->next; | |
188 | io1 = container_of(after, ext4_io_end_t, list); | |
189 | ||
190 | ext4_debug("io 0x%p from inode %lu,prev 0x%p,next 0x%p\n", | |
191 | io, inode->i_ino, io0, io1); | |
192 | } | |
193 | #endif | |
194 | } | |
195 | ||
196 | /* Add the io_end to per-inode completed end_io list. */ | |
97a851ed | 197 | static void ext4_add_complete_io(ext4_io_end_t *io_end) |
bd2d0210 | 198 | { |
28a535f9 | 199 | struct ext4_inode_info *ei = EXT4_I(io_end->inode); |
78371a45 | 200 | struct ext4_sb_info *sbi = EXT4_SB(io_end->inode->i_sb); |
28a535f9 DM |
201 | struct workqueue_struct *wq; |
202 | unsigned long flags; | |
203 | ||
7b7a8665 CH |
204 | /* Only reserved conversions from writeback should enter here */ |
205 | WARN_ON(!(io_end->flag & EXT4_IO_END_UNWRITTEN)); | |
78371a45 | 206 | WARN_ON(!io_end->handle && sbi->s_journal); |
d73d5046 | 207 | spin_lock_irqsave(&ei->i_completed_io_lock, flags); |
78371a45 | 208 | wq = sbi->rsv_conversion_wq; |
7b7a8665 CH |
209 | if (list_empty(&ei->i_rsv_conversion_list)) |
210 | queue_work(wq, &ei->i_rsv_conversion_work); | |
211 | list_add_tail(&io_end->list, &ei->i_rsv_conversion_list); | |
28a535f9 DM |
212 | spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); |
213 | } | |
d73d5046 | 214 | |
2e8fa54e JK |
215 | static int ext4_do_flush_completed_IO(struct inode *inode, |
216 | struct list_head *head) | |
28a535f9 DM |
217 | { |
218 | ext4_io_end_t *io; | |
002bd7fa | 219 | struct list_head unwritten; |
28a535f9 DM |
220 | unsigned long flags; |
221 | struct ext4_inode_info *ei = EXT4_I(inode); | |
222 | int err, ret = 0; | |
223 | ||
28a535f9 | 224 | spin_lock_irqsave(&ei->i_completed_io_lock, flags); |
2e8fa54e JK |
225 | dump_completed_IO(inode, head); |
226 | list_replace_init(head, &unwritten); | |
28a535f9 DM |
227 | spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); |
228 | ||
229 | while (!list_empty(&unwritten)) { | |
230 | io = list_entry(unwritten.next, ext4_io_end_t, list); | |
231 | BUG_ON(!(io->flag & EXT4_IO_END_UNWRITTEN)); | |
232 | list_del_init(&io->list); | |
233 | ||
234 | err = ext4_end_io(io); | |
235 | if (unlikely(!ret && err)) | |
236 | ret = err; | |
28a535f9 DM |
237 | } |
238 | return ret; | |
239 | } | |
240 | ||
241 | /* | |
2e8fa54e | 242 | * work on completed IO, to convert unwritten extents to extents |
28a535f9 | 243 | */ |
2e8fa54e JK |
244 | void ext4_end_io_rsv_work(struct work_struct *work) |
245 | { | |
246 | struct ext4_inode_info *ei = container_of(work, struct ext4_inode_info, | |
247 | i_rsv_conversion_work); | |
248 | ext4_do_flush_completed_IO(&ei->vfs_inode, &ei->i_rsv_conversion_list); | |
249 | } | |
250 | ||
bd2d0210 TT |
251 | ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags) |
252 | { | |
b17b35ec | 253 | ext4_io_end_t *io = kmem_cache_zalloc(io_end_cachep, flags); |
bd2d0210 | 254 | if (io) { |
f7ad6d2e | 255 | io->inode = inode; |
bd2d0210 | 256 | INIT_LIST_HEAD(&io->list); |
97a851ed | 257 | atomic_set(&io->count, 1); |
bd2d0210 TT |
258 | } |
259 | return io; | |
260 | } | |
261 | ||
97a851ed JK |
262 | void ext4_put_io_end_defer(ext4_io_end_t *io_end) |
263 | { | |
264 | if (atomic_dec_and_test(&io_end->count)) { | |
265 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN) || !io_end->size) { | |
266 | ext4_release_io_end(io_end); | |
267 | return; | |
268 | } | |
269 | ext4_add_complete_io(io_end); | |
270 | } | |
271 | } | |
272 | ||
273 | int ext4_put_io_end(ext4_io_end_t *io_end) | |
274 | { | |
275 | int err = 0; | |
276 | ||
277 | if (atomic_dec_and_test(&io_end->count)) { | |
278 | if (io_end->flag & EXT4_IO_END_UNWRITTEN) { | |
6b523df4 JK |
279 | err = ext4_convert_unwritten_extents(io_end->handle, |
280 | io_end->inode, io_end->offset, | |
281 | io_end->size); | |
282 | io_end->handle = NULL; | |
97a851ed JK |
283 | ext4_clear_io_unwritten_flag(io_end); |
284 | } | |
285 | ext4_release_io_end(io_end); | |
286 | } | |
287 | return err; | |
288 | } | |
289 | ||
290 | ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end) | |
291 | { | |
292 | atomic_inc(&io_end->count); | |
293 | return io_end; | |
294 | } | |
295 | ||
822dbba3 | 296 | /* BIO completion function for page writeback */ |
4246a0b6 | 297 | static void ext4_end_bio(struct bio *bio) |
bd2d0210 TT |
298 | { |
299 | ext4_io_end_t *io_end = bio->bi_private; | |
4f024f37 | 300 | sector_t bi_sector = bio->bi_iter.bi_sector; |
72d622b4 | 301 | char b[BDEVNAME_SIZE]; |
bd2d0210 | 302 | |
72d622b4 | 303 | if (WARN_ONCE(!io_end, "io_end is NULL: %s: sector %Lu len %u err %d\n", |
74d46992 | 304 | bio_devname(bio, b), |
72d622b4 TT |
305 | (long long) bio->bi_iter.bi_sector, |
306 | (unsigned) bio_sectors(bio), | |
4e4cbee9 | 307 | bio->bi_status)) { |
72d622b4 TT |
308 | ext4_finish_bio(bio); |
309 | bio_put(bio); | |
310 | return; | |
311 | } | |
bd2d0210 | 312 | bio->bi_end_io = NULL; |
0058f965 | 313 | |
4e4cbee9 | 314 | if (bio->bi_status) { |
b0857d30 JK |
315 | struct inode *inode = io_end->inode; |
316 | ||
9503c67c | 317 | ext4_warning(inode->i_sb, "I/O error %d writing to inode %lu " |
f7ad6d2e | 318 | "(offset %llu size %ld starting block %llu)", |
4e4cbee9 | 319 | bio->bi_status, inode->i_ino, |
f7ad6d2e TT |
320 | (unsigned long long) io_end->offset, |
321 | (long) io_end->size, | |
322 | (unsigned long long) | |
d50bdd5a | 323 | bi_sector >> (inode->i_blkbits - 9)); |
4e4cbee9 CH |
324 | mapping_set_error(inode->i_mapping, |
325 | blk_status_to_errno(bio->bi_status)); | |
f7ad6d2e | 326 | } |
822dbba3 JK |
327 | |
328 | if (io_end->flag & EXT4_IO_END_UNWRITTEN) { | |
329 | /* | |
330 | * Link bio into list hanging from io_end. We have to do it | |
331 | * atomically as bio completions can be racing against each | |
332 | * other. | |
333 | */ | |
334 | bio->bi_private = xchg(&io_end->bio, bio); | |
335 | ext4_put_io_end_defer(io_end); | |
336 | } else { | |
337 | /* | |
338 | * Drop io_end reference early. Inode can get freed once | |
339 | * we finish the bio. | |
340 | */ | |
341 | ext4_put_io_end_defer(io_end); | |
342 | ext4_finish_bio(bio); | |
343 | bio_put(bio); | |
344 | } | |
bd2d0210 TT |
345 | } |
346 | ||
347 | void ext4_io_submit(struct ext4_io_submit *io) | |
348 | { | |
349 | struct bio *bio = io->io_bio; | |
350 | ||
351 | if (bio) { | |
95fe6c1a | 352 | int io_op_flags = io->io_wbc->sync_mode == WB_SYNC_ALL ? |
70fd7614 | 353 | REQ_SYNC : 0; |
0127251c | 354 | io->io_bio->bi_write_hint = io->io_end->inode->i_write_hint; |
95fe6c1a | 355 | bio_set_op_attrs(io->io_bio, REQ_OP_WRITE, io_op_flags); |
4e49ea4a | 356 | submit_bio(io->io_bio); |
bd2d0210 | 357 | } |
7dc57615 | 358 | io->io_bio = NULL; |
97a851ed JK |
359 | } |
360 | ||
361 | void ext4_io_submit_init(struct ext4_io_submit *io, | |
362 | struct writeback_control *wbc) | |
363 | { | |
5a33911f | 364 | io->io_wbc = wbc; |
97a851ed | 365 | io->io_bio = NULL; |
7dc57615 | 366 | io->io_end = NULL; |
bd2d0210 TT |
367 | } |
368 | ||
97a851ed JK |
369 | static int io_submit_init_bio(struct ext4_io_submit *io, |
370 | struct buffer_head *bh) | |
bd2d0210 | 371 | { |
bd2d0210 TT |
372 | struct bio *bio; |
373 | ||
b54ffb73 | 374 | bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES); |
a1d8d9a7 TT |
375 | if (!bio) |
376 | return -ENOMEM; | |
001e4a87 | 377 | wbc_init_bio(io->io_wbc, bio); |
4f024f37 | 378 | bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9); |
74d46992 | 379 | bio_set_dev(bio, bh->b_bdev); |
bd2d0210 | 380 | bio->bi_end_io = ext4_end_bio; |
97a851ed | 381 | bio->bi_private = ext4_get_io_end(io->io_end); |
bd2d0210 | 382 | io->io_bio = bio; |
bd2d0210 TT |
383 | io->io_next_block = bh->b_blocknr; |
384 | return 0; | |
385 | } | |
386 | ||
387 | static int io_submit_add_bh(struct ext4_io_submit *io, | |
bd2d0210 | 388 | struct inode *inode, |
2058f83a | 389 | struct page *page, |
bd2d0210 TT |
390 | struct buffer_head *bh) |
391 | { | |
bd2d0210 TT |
392 | int ret; |
393 | ||
bd2d0210 TT |
394 | if (io->io_bio && bh->b_blocknr != io->io_next_block) { |
395 | submit_and_retry: | |
396 | ext4_io_submit(io); | |
397 | } | |
398 | if (io->io_bio == NULL) { | |
97a851ed | 399 | ret = io_submit_init_bio(io, bh); |
bd2d0210 TT |
400 | if (ret) |
401 | return ret; | |
0127251c | 402 | io->io_bio->bi_write_hint = inode->i_write_hint; |
bd2d0210 | 403 | } |
2058f83a | 404 | ret = bio_add_page(io->io_bio, page, bh->b_size, bh_offset(bh)); |
97a851ed JK |
405 | if (ret != bh->b_size) |
406 | goto submit_and_retry; | |
001e4a87 | 407 | wbc_account_io(io->io_wbc, page, bh->b_size); |
bd2d0210 | 408 | io->io_next_block++; |
bd2d0210 TT |
409 | return 0; |
410 | } | |
411 | ||
412 | int ext4_bio_write_page(struct ext4_io_submit *io, | |
413 | struct page *page, | |
414 | int len, | |
1c8349a1 NJ |
415 | struct writeback_control *wbc, |
416 | bool keep_towrite) | |
bd2d0210 | 417 | { |
2058f83a | 418 | struct page *data_page = NULL; |
bd2d0210 | 419 | struct inode *inode = page->mapping->host; |
18017479 | 420 | unsigned block_start; |
bd2d0210 TT |
421 | struct buffer_head *bh, *head; |
422 | int ret = 0; | |
0058f965 | 423 | int nr_submitted = 0; |
937d7b84 | 424 | int nr_to_submit = 0; |
bd2d0210 | 425 | |
d50bdd5a | 426 | BUG_ON(!PageLocked(page)); |
bd2d0210 | 427 | BUG_ON(PageWriteback(page)); |
bd2d0210 | 428 | |
1c8349a1 NJ |
429 | if (keep_towrite) |
430 | set_page_writeback_keepwrite(page); | |
431 | else | |
432 | set_page_writeback(page); | |
a54aa761 | 433 | ClearPageError(page); |
bd2d0210 | 434 | |
eeece469 | 435 | /* |
f8409abd | 436 | * Comments copied from block_write_full_page: |
eeece469 JK |
437 | * |
438 | * The page straddles i_size. It must be zeroed out on each and every | |
439 | * writepage invocation because it may be mmapped. "A file is mapped | |
440 | * in multiples of the page size. For a file that is not a multiple of | |
441 | * the page size, the remaining memory is zeroed when mapped, and | |
442 | * writes to that region are not written out to the file." | |
443 | */ | |
09cbfeaf KS |
444 | if (len < PAGE_SIZE) |
445 | zero_user_segment(page, len, PAGE_SIZE); | |
0058f965 JK |
446 | /* |
447 | * In the first loop we prepare and mark buffers to submit. We have to | |
448 | * mark all buffers in the page before submitting so that | |
449 | * end_page_writeback() cannot be called from ext4_bio_end_io() when IO | |
450 | * on the first buffer finishes and we are still working on submitting | |
451 | * the second buffer. | |
452 | */ | |
453 | bh = head = page_buffers(page); | |
454 | do { | |
455 | block_start = bh_offset(bh); | |
bd2d0210 TT |
456 | if (block_start >= len) { |
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); | |
e64855c6 | 472 | clean_bdev_bh_alias(bh); |
0058f965 JK |
473 | } |
474 | set_buffer_async_write(bh); | |
937d7b84 | 475 | nr_to_submit++; |
0058f965 JK |
476 | } while ((bh = bh->b_this_page) != head); |
477 | ||
0058f965 | 478 | bh = head = page_buffers(page); |
2058f83a | 479 | |
937d7b84 TT |
480 | if (ext4_encrypted_inode(inode) && S_ISREG(inode->i_mode) && |
481 | nr_to_submit) { | |
c9af28fd TT |
482 | gfp_t gfp_flags = GFP_NOFS; |
483 | ||
484 | retry_encrypt: | |
9c4bb8a3 DG |
485 | data_page = fscrypt_encrypt_page(inode, page, PAGE_SIZE, 0, |
486 | page->index, gfp_flags); | |
2058f83a MH |
487 | if (IS_ERR(data_page)) { |
488 | ret = PTR_ERR(data_page); | |
4762cc3f | 489 | if (ret == -ENOMEM && wbc->sync_mode == WB_SYNC_ALL) { |
c9af28fd TT |
490 | if (io->io_bio) { |
491 | ext4_io_submit(io); | |
492 | congestion_wait(BLK_RW_ASYNC, HZ/50); | |
493 | } | |
494 | gfp_flags |= __GFP_NOFAIL; | |
495 | goto retry_encrypt; | |
496 | } | |
2058f83a MH |
497 | data_page = NULL; |
498 | goto out; | |
499 | } | |
500 | } | |
501 | ||
502 | /* Now submit buffers to write */ | |
0058f965 JK |
503 | do { |
504 | if (!buffer_async_write(bh)) | |
505 | continue; | |
2058f83a MH |
506 | ret = io_submit_add_bh(io, inode, |
507 | data_page ? data_page : page, bh); | |
bd2d0210 TT |
508 | if (ret) { |
509 | /* | |
510 | * We only get here on ENOMEM. Not much else | |
511 | * we can do but mark the page as dirty, and | |
512 | * better luck next time. | |
513 | */ | |
bd2d0210 TT |
514 | break; |
515 | } | |
0058f965 | 516 | nr_submitted++; |
1ae48a63 | 517 | clear_buffer_dirty(bh); |
0058f965 JK |
518 | } while ((bh = bh->b_this_page) != head); |
519 | ||
520 | /* Error stopped previous loop? Clean up buffers... */ | |
521 | if (ret) { | |
2058f83a MH |
522 | out: |
523 | if (data_page) | |
a7550b30 | 524 | fscrypt_restore_control_page(data_page); |
2058f83a MH |
525 | printk_ratelimited(KERN_ERR "%s: ret = %d\n", __func__, ret); |
526 | redirty_page_for_writepage(wbc, page); | |
0058f965 JK |
527 | do { |
528 | clear_buffer_async_write(bh); | |
529 | bh = bh->b_this_page; | |
530 | } while (bh != head); | |
bd2d0210 TT |
531 | } |
532 | unlock_page(page); | |
0058f965 JK |
533 | /* Nothing submitted - we have to end page writeback */ |
534 | if (!nr_submitted) | |
535 | end_page_writeback(page); | |
bd2d0210 TT |
536 | return ret; |
537 | } |