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 | { | |
2c30c71b | 64 | struct bio_vec *bvec; |
6dc4f100 | 65 | struct bvec_iter_all iter_all; |
b0857d30 | 66 | |
2b070cfe | 67 | bio_for_each_segment_all(bvec, bio, iter_all) { |
b0857d30 | 68 | struct page *page = bvec->bv_page; |
d2d0727b | 69 | struct page *bounce_page = NULL; |
b0857d30 JK |
70 | struct buffer_head *bh, *head; |
71 | unsigned bio_start = bvec->bv_offset; | |
72 | unsigned bio_end = bio_start + bvec->bv_len; | |
73 | unsigned under_io = 0; | |
74 | unsigned long flags; | |
75 | ||
76 | if (!page) | |
77 | continue; | |
78 | ||
d2d0727b EB |
79 | if (fscrypt_is_bounce_page(page)) { |
80 | bounce_page = page; | |
81 | page = fscrypt_pagecache_page(bounce_page); | |
2058f83a | 82 | } |
2058f83a | 83 | |
4e4cbee9 | 84 | if (bio->bi_status) { |
b0857d30 | 85 | SetPageError(page); |
5114a97a | 86 | mapping_set_error(page->mapping, -EIO); |
b0857d30 JK |
87 | } |
88 | bh = head = page_buffers(page); | |
89 | /* | |
90 | * We check all buffers in the page under BH_Uptodate_Lock | |
91 | * to avoid races with other end io clearing async_write flags | |
92 | */ | |
93 | local_irq_save(flags); | |
94 | bit_spin_lock(BH_Uptodate_Lock, &head->b_state); | |
95 | do { | |
96 | if (bh_offset(bh) < bio_start || | |
97 | bh_offset(bh) + bh->b_size > bio_end) { | |
98 | if (buffer_async_write(bh)) | |
99 | under_io++; | |
100 | continue; | |
101 | } | |
102 | clear_buffer_async_write(bh); | |
4e4cbee9 | 103 | if (bio->bi_status) |
b0857d30 JK |
104 | buffer_io_error(bh); |
105 | } while ((bh = bh->b_this_page) != head); | |
106 | bit_spin_unlock(BH_Uptodate_Lock, &head->b_state); | |
107 | local_irq_restore(flags); | |
2058f83a | 108 | if (!under_io) { |
d2d0727b | 109 | fscrypt_free_bounce_page(bounce_page); |
b0857d30 | 110 | end_page_writeback(page); |
2058f83a | 111 | } |
b0857d30 JK |
112 | } |
113 | } | |
114 | ||
97a851ed | 115 | static void ext4_release_io_end(ext4_io_end_t *io_end) |
bd2d0210 | 116 | { |
b0857d30 JK |
117 | struct bio *bio, *next_bio; |
118 | ||
97a851ed JK |
119 | BUG_ON(!list_empty(&io_end->list)); |
120 | BUG_ON(io_end->flag & EXT4_IO_END_UNWRITTEN); | |
6b523df4 | 121 | WARN_ON(io_end->handle); |
97a851ed | 122 | |
b0857d30 JK |
123 | for (bio = io_end->bio; bio; bio = next_bio) { |
124 | next_bio = bio->bi_private; | |
125 | ext4_finish_bio(bio); | |
126 | bio_put(bio); | |
127 | } | |
97a851ed JK |
128 | kmem_cache_free(io_end_cachep, io_end); |
129 | } | |
130 | ||
a115f749 JK |
131 | /* |
132 | * Check a range of space and convert unwritten extents to written. Note that | |
133 | * we are protected from truncate touching same part of extent tree by the | |
134 | * fact that truncate code waits for all DIO to finish (thus exclusion from | |
135 | * direct IO is achieved) and also waits for PageWriteback bits. Thus we | |
136 | * cannot get to ext4_ext_truncate() before all IOs overlapping that range are | |
137 | * completed (happens from ext4_free_ioend()). | |
138 | */ | |
28a535f9 | 139 | static int ext4_end_io(ext4_io_end_t *io) |
bd2d0210 TT |
140 | { |
141 | struct inode *inode = io->inode; | |
142 | loff_t offset = io->offset; | |
143 | ssize_t size = io->size; | |
6b523df4 | 144 | handle_t *handle = io->handle; |
bd2d0210 TT |
145 | int ret = 0; |
146 | ||
147 | ext4_debug("ext4_end_io_nolock: io 0x%p from inode %lu,list->next 0x%p," | |
148 | "list->prev 0x%p\n", | |
149 | io, inode->i_ino, io->list.next, io->list.prev); | |
150 | ||
6b523df4 JK |
151 | io->handle = NULL; /* Following call will use up the handle */ |
152 | ret = ext4_convert_unwritten_extents(handle, inode, offset, size); | |
0db1ff22 | 153 | if (ret < 0 && !ext4_forced_shutdown(EXT4_SB(inode->i_sb))) { |
b82e384c TT |
154 | ext4_msg(inode->i_sb, KERN_EMERG, |
155 | "failed to convert unwritten extents to written " | |
156 | "extents -- potential data loss! " | |
157 | "(inode %lu, offset %llu, size %zd, error %d)", | |
158 | inode->i_ino, offset, size, ret); | |
bd2d0210 | 159 | } |
97a851ed JK |
160 | ext4_clear_io_unwritten_flag(io); |
161 | ext4_release_io_end(io); | |
bd2d0210 TT |
162 | return ret; |
163 | } | |
164 | ||
2e8fa54e | 165 | static void dump_completed_IO(struct inode *inode, struct list_head *head) |
28a535f9 DM |
166 | { |
167 | #ifdef EXT4FS_DEBUG | |
168 | struct list_head *cur, *before, *after; | |
169 | ext4_io_end_t *io, *io0, *io1; | |
28a535f9 | 170 | |
2e8fa54e | 171 | if (list_empty(head)) |
28a535f9 | 172 | return; |
28a535f9 | 173 | |
2e8fa54e JK |
174 | ext4_debug("Dump inode %lu completed io list\n", inode->i_ino); |
175 | list_for_each_entry(io, head, list) { | |
28a535f9 DM |
176 | cur = &io->list; |
177 | before = cur->prev; | |
178 | io0 = container_of(before, ext4_io_end_t, list); | |
179 | after = cur->next; | |
180 | io1 = container_of(after, ext4_io_end_t, list); | |
181 | ||
182 | ext4_debug("io 0x%p from inode %lu,prev 0x%p,next 0x%p\n", | |
183 | io, inode->i_ino, io0, io1); | |
184 | } | |
185 | #endif | |
186 | } | |
187 | ||
188 | /* Add the io_end to per-inode completed end_io list. */ | |
97a851ed | 189 | static void ext4_add_complete_io(ext4_io_end_t *io_end) |
bd2d0210 | 190 | { |
28a535f9 | 191 | struct ext4_inode_info *ei = EXT4_I(io_end->inode); |
78371a45 | 192 | struct ext4_sb_info *sbi = EXT4_SB(io_end->inode->i_sb); |
28a535f9 DM |
193 | struct workqueue_struct *wq; |
194 | unsigned long flags; | |
195 | ||
7b7a8665 CH |
196 | /* Only reserved conversions from writeback should enter here */ |
197 | WARN_ON(!(io_end->flag & EXT4_IO_END_UNWRITTEN)); | |
78371a45 | 198 | WARN_ON(!io_end->handle && sbi->s_journal); |
d73d5046 | 199 | spin_lock_irqsave(&ei->i_completed_io_lock, flags); |
78371a45 | 200 | wq = sbi->rsv_conversion_wq; |
7b7a8665 CH |
201 | if (list_empty(&ei->i_rsv_conversion_list)) |
202 | queue_work(wq, &ei->i_rsv_conversion_work); | |
203 | list_add_tail(&io_end->list, &ei->i_rsv_conversion_list); | |
28a535f9 DM |
204 | spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); |
205 | } | |
d73d5046 | 206 | |
2e8fa54e JK |
207 | static int ext4_do_flush_completed_IO(struct inode *inode, |
208 | struct list_head *head) | |
28a535f9 DM |
209 | { |
210 | ext4_io_end_t *io; | |
002bd7fa | 211 | struct list_head unwritten; |
28a535f9 DM |
212 | unsigned long flags; |
213 | struct ext4_inode_info *ei = EXT4_I(inode); | |
214 | int err, ret = 0; | |
215 | ||
28a535f9 | 216 | spin_lock_irqsave(&ei->i_completed_io_lock, flags); |
2e8fa54e JK |
217 | dump_completed_IO(inode, head); |
218 | list_replace_init(head, &unwritten); | |
28a535f9 DM |
219 | spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); |
220 | ||
221 | while (!list_empty(&unwritten)) { | |
222 | io = list_entry(unwritten.next, ext4_io_end_t, list); | |
223 | BUG_ON(!(io->flag & EXT4_IO_END_UNWRITTEN)); | |
224 | list_del_init(&io->list); | |
225 | ||
226 | err = ext4_end_io(io); | |
227 | if (unlikely(!ret && err)) | |
228 | ret = err; | |
28a535f9 DM |
229 | } |
230 | return ret; | |
231 | } | |
232 | ||
233 | /* | |
2e8fa54e | 234 | * work on completed IO, to convert unwritten extents to extents |
28a535f9 | 235 | */ |
2e8fa54e JK |
236 | void ext4_end_io_rsv_work(struct work_struct *work) |
237 | { | |
238 | struct ext4_inode_info *ei = container_of(work, struct ext4_inode_info, | |
239 | i_rsv_conversion_work); | |
240 | ext4_do_flush_completed_IO(&ei->vfs_inode, &ei->i_rsv_conversion_list); | |
241 | } | |
242 | ||
bd2d0210 TT |
243 | ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags) |
244 | { | |
b17b35ec | 245 | ext4_io_end_t *io = kmem_cache_zalloc(io_end_cachep, flags); |
bd2d0210 | 246 | if (io) { |
f7ad6d2e | 247 | io->inode = inode; |
bd2d0210 | 248 | INIT_LIST_HEAD(&io->list); |
97a851ed | 249 | atomic_set(&io->count, 1); |
bd2d0210 TT |
250 | } |
251 | return io; | |
252 | } | |
253 | ||
97a851ed JK |
254 | void ext4_put_io_end_defer(ext4_io_end_t *io_end) |
255 | { | |
256 | if (atomic_dec_and_test(&io_end->count)) { | |
257 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN) || !io_end->size) { | |
258 | ext4_release_io_end(io_end); | |
259 | return; | |
260 | } | |
261 | ext4_add_complete_io(io_end); | |
262 | } | |
263 | } | |
264 | ||
265 | int ext4_put_io_end(ext4_io_end_t *io_end) | |
266 | { | |
267 | int err = 0; | |
268 | ||
269 | if (atomic_dec_and_test(&io_end->count)) { | |
270 | if (io_end->flag & EXT4_IO_END_UNWRITTEN) { | |
6b523df4 JK |
271 | err = ext4_convert_unwritten_extents(io_end->handle, |
272 | io_end->inode, io_end->offset, | |
273 | io_end->size); | |
274 | io_end->handle = NULL; | |
97a851ed JK |
275 | ext4_clear_io_unwritten_flag(io_end); |
276 | } | |
277 | ext4_release_io_end(io_end); | |
278 | } | |
279 | return err; | |
280 | } | |
281 | ||
282 | ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end) | |
283 | { | |
284 | atomic_inc(&io_end->count); | |
285 | return io_end; | |
286 | } | |
287 | ||
822dbba3 | 288 | /* BIO completion function for page writeback */ |
4246a0b6 | 289 | static void ext4_end_bio(struct bio *bio) |
bd2d0210 TT |
290 | { |
291 | ext4_io_end_t *io_end = bio->bi_private; | |
4f024f37 | 292 | sector_t bi_sector = bio->bi_iter.bi_sector; |
72d622b4 | 293 | char b[BDEVNAME_SIZE]; |
bd2d0210 | 294 | |
72d622b4 | 295 | if (WARN_ONCE(!io_end, "io_end is NULL: %s: sector %Lu len %u err %d\n", |
74d46992 | 296 | bio_devname(bio, b), |
72d622b4 TT |
297 | (long long) bio->bi_iter.bi_sector, |
298 | (unsigned) bio_sectors(bio), | |
4e4cbee9 | 299 | bio->bi_status)) { |
72d622b4 TT |
300 | ext4_finish_bio(bio); |
301 | bio_put(bio); | |
302 | return; | |
303 | } | |
bd2d0210 | 304 | bio->bi_end_io = NULL; |
0058f965 | 305 | |
4e4cbee9 | 306 | if (bio->bi_status) { |
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)", |
4e4cbee9 | 311 | bio->bi_status, 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)); |
4e4cbee9 CH |
316 | mapping_set_error(inode->i_mapping, |
317 | blk_status_to_errno(bio->bi_status)); | |
f7ad6d2e | 318 | } |
822dbba3 JK |
319 | |
320 | if (io_end->flag & EXT4_IO_END_UNWRITTEN) { | |
321 | /* | |
322 | * Link bio into list hanging from io_end. We have to do it | |
323 | * atomically as bio completions can be racing against each | |
324 | * other. | |
325 | */ | |
326 | bio->bi_private = xchg(&io_end->bio, bio); | |
327 | ext4_put_io_end_defer(io_end); | |
328 | } else { | |
329 | /* | |
330 | * Drop io_end reference early. Inode can get freed once | |
331 | * we finish the bio. | |
332 | */ | |
333 | ext4_put_io_end_defer(io_end); | |
334 | ext4_finish_bio(bio); | |
335 | bio_put(bio); | |
336 | } | |
bd2d0210 TT |
337 | } |
338 | ||
339 | void ext4_io_submit(struct ext4_io_submit *io) | |
340 | { | |
341 | struct bio *bio = io->io_bio; | |
342 | ||
343 | if (bio) { | |
95fe6c1a | 344 | int io_op_flags = io->io_wbc->sync_mode == WB_SYNC_ALL ? |
70fd7614 | 345 | REQ_SYNC : 0; |
0127251c | 346 | io->io_bio->bi_write_hint = io->io_end->inode->i_write_hint; |
95fe6c1a | 347 | bio_set_op_attrs(io->io_bio, REQ_OP_WRITE, io_op_flags); |
4e49ea4a | 348 | submit_bio(io->io_bio); |
bd2d0210 | 349 | } |
7dc57615 | 350 | io->io_bio = NULL; |
97a851ed JK |
351 | } |
352 | ||
353 | void ext4_io_submit_init(struct ext4_io_submit *io, | |
354 | struct writeback_control *wbc) | |
355 | { | |
5a33911f | 356 | io->io_wbc = wbc; |
97a851ed | 357 | io->io_bio = NULL; |
7dc57615 | 358 | io->io_end = NULL; |
bd2d0210 TT |
359 | } |
360 | ||
97a851ed JK |
361 | static int io_submit_init_bio(struct ext4_io_submit *io, |
362 | struct buffer_head *bh) | |
bd2d0210 | 363 | { |
bd2d0210 TT |
364 | struct bio *bio; |
365 | ||
b54ffb73 | 366 | bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES); |
a1d8d9a7 TT |
367 | if (!bio) |
368 | return -ENOMEM; | |
4f024f37 | 369 | bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9); |
74d46992 | 370 | bio_set_dev(bio, bh->b_bdev); |
bd2d0210 | 371 | bio->bi_end_io = ext4_end_bio; |
97a851ed | 372 | bio->bi_private = ext4_get_io_end(io->io_end); |
bd2d0210 | 373 | io->io_bio = bio; |
bd2d0210 | 374 | io->io_next_block = bh->b_blocknr; |
fd42df30 | 375 | wbc_init_bio(io->io_wbc, bio); |
bd2d0210 TT |
376 | return 0; |
377 | } | |
378 | ||
379 | static int io_submit_add_bh(struct ext4_io_submit *io, | |
bd2d0210 | 380 | struct inode *inode, |
2058f83a | 381 | struct page *page, |
bd2d0210 TT |
382 | struct buffer_head *bh) |
383 | { | |
bd2d0210 TT |
384 | int ret; |
385 | ||
bd2d0210 TT |
386 | if (io->io_bio && bh->b_blocknr != io->io_next_block) { |
387 | submit_and_retry: | |
388 | ext4_io_submit(io); | |
389 | } | |
390 | if (io->io_bio == NULL) { | |
97a851ed | 391 | ret = io_submit_init_bio(io, bh); |
bd2d0210 TT |
392 | if (ret) |
393 | return ret; | |
0127251c | 394 | io->io_bio->bi_write_hint = inode->i_write_hint; |
bd2d0210 | 395 | } |
2058f83a | 396 | ret = bio_add_page(io->io_bio, page, bh->b_size, bh_offset(bh)); |
97a851ed JK |
397 | if (ret != bh->b_size) |
398 | goto submit_and_retry; | |
34e51a5e | 399 | wbc_account_cgroup_owner(io->io_wbc, page, bh->b_size); |
bd2d0210 | 400 | io->io_next_block++; |
bd2d0210 TT |
401 | return 0; |
402 | } | |
403 | ||
404 | int ext4_bio_write_page(struct ext4_io_submit *io, | |
405 | struct page *page, | |
406 | int len, | |
1c8349a1 NJ |
407 | struct writeback_control *wbc, |
408 | bool keep_towrite) | |
bd2d0210 | 409 | { |
d2d0727b | 410 | struct page *bounce_page = NULL; |
bd2d0210 | 411 | struct inode *inode = page->mapping->host; |
18017479 | 412 | unsigned block_start; |
bd2d0210 TT |
413 | struct buffer_head *bh, *head; |
414 | int ret = 0; | |
0058f965 | 415 | int nr_submitted = 0; |
937d7b84 | 416 | int nr_to_submit = 0; |
bd2d0210 | 417 | |
d50bdd5a | 418 | BUG_ON(!PageLocked(page)); |
bd2d0210 | 419 | BUG_ON(PageWriteback(page)); |
bd2d0210 | 420 | |
1c8349a1 NJ |
421 | if (keep_towrite) |
422 | set_page_writeback_keepwrite(page); | |
423 | else | |
424 | set_page_writeback(page); | |
a54aa761 | 425 | ClearPageError(page); |
bd2d0210 | 426 | |
eeece469 | 427 | /* |
f8409abd | 428 | * Comments copied from block_write_full_page: |
eeece469 JK |
429 | * |
430 | * The page straddles i_size. It must be zeroed out on each and every | |
431 | * writepage invocation because it may be mmapped. "A file is mapped | |
432 | * in multiples of the page size. For a file that is not a multiple of | |
433 | * the page size, the remaining memory is zeroed when mapped, and | |
434 | * writes to that region are not written out to the file." | |
435 | */ | |
09cbfeaf KS |
436 | if (len < PAGE_SIZE) |
437 | zero_user_segment(page, len, PAGE_SIZE); | |
0058f965 JK |
438 | /* |
439 | * In the first loop we prepare and mark buffers to submit. We have to | |
440 | * mark all buffers in the page before submitting so that | |
441 | * end_page_writeback() cannot be called from ext4_bio_end_io() when IO | |
442 | * on the first buffer finishes and we are still working on submitting | |
443 | * the second buffer. | |
444 | */ | |
445 | bh = head = page_buffers(page); | |
446 | do { | |
447 | block_start = bh_offset(bh); | |
bd2d0210 TT |
448 | if (block_start >= len) { |
449 | clear_buffer_dirty(bh); | |
450 | set_buffer_uptodate(bh); | |
451 | continue; | |
452 | } | |
8a850c3f JK |
453 | if (!buffer_dirty(bh) || buffer_delay(bh) || |
454 | !buffer_mapped(bh) || buffer_unwritten(bh)) { | |
455 | /* A hole? We can safely clear the dirty bit */ | |
456 | if (!buffer_mapped(bh)) | |
457 | clear_buffer_dirty(bh); | |
458 | if (io->io_bio) | |
459 | ext4_io_submit(io); | |
460 | continue; | |
461 | } | |
16e08b14 | 462 | if (buffer_new(bh)) |
0058f965 | 463 | clear_buffer_new(bh); |
0058f965 | 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 | |
6e4b73bc EB |
470 | /* |
471 | * If any blocks are being written to an encrypted file, encrypt them | |
472 | * into a bounce page. For simplicity, just encrypt until the last | |
473 | * block which might be needed. This may cause some unneeded blocks | |
474 | * (e.g. holes) to be unnecessarily encrypted, but this is rare and | |
475 | * can't happen in the common case of blocksize == PAGE_SIZE. | |
476 | */ | |
592ddec7 | 477 | if (IS_ENCRYPTED(inode) && S_ISREG(inode->i_mode) && nr_to_submit) { |
c9af28fd | 478 | gfp_t gfp_flags = GFP_NOFS; |
6e4b73bc | 479 | unsigned int enc_bytes = round_up(len, i_blocksize(inode)); |
c9af28fd TT |
480 | |
481 | retry_encrypt: | |
6e4b73bc | 482 | bounce_page = fscrypt_encrypt_pagecache_blocks(page, enc_bytes, |
53bc1d85 | 483 | 0, gfp_flags); |
d2d0727b EB |
484 | if (IS_ERR(bounce_page)) { |
485 | ret = PTR_ERR(bounce_page); | |
4762cc3f | 486 | if (ret == -ENOMEM && wbc->sync_mode == WB_SYNC_ALL) { |
c9af28fd TT |
487 | if (io->io_bio) { |
488 | ext4_io_submit(io); | |
489 | congestion_wait(BLK_RW_ASYNC, HZ/50); | |
490 | } | |
491 | gfp_flags |= __GFP_NOFAIL; | |
492 | goto retry_encrypt; | |
493 | } | |
d2d0727b | 494 | bounce_page = NULL; |
2058f83a MH |
495 | goto out; |
496 | } | |
497 | } | |
498 | ||
499 | /* Now submit buffers to write */ | |
0058f965 JK |
500 | do { |
501 | if (!buffer_async_write(bh)) | |
502 | continue; | |
d2d0727b | 503 | ret = io_submit_add_bh(io, inode, bounce_page ?: page, bh); |
bd2d0210 TT |
504 | if (ret) { |
505 | /* | |
506 | * We only get here on ENOMEM. Not much else | |
507 | * we can do but mark the page as dirty, and | |
508 | * better luck next time. | |
509 | */ | |
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) { | |
2058f83a | 518 | out: |
d2d0727b | 519 | fscrypt_free_bounce_page(bounce_page); |
2058f83a MH |
520 | printk_ratelimited(KERN_ERR "%s: ret = %d\n", __func__, ret); |
521 | redirty_page_for_writepage(wbc, page); | |
0058f965 JK |
522 | do { |
523 | clear_buffer_async_write(bh); | |
524 | bh = bh->b_this_page; | |
525 | } while (bh != head); | |
bd2d0210 TT |
526 | } |
527 | unlock_page(page); | |
0058f965 JK |
528 | /* Nothing submitted - we have to end page writeback */ |
529 | if (!nr_submitted) | |
530 | end_page_writeback(page); | |
bd2d0210 TT |
531 | return ret; |
532 | } |