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64b5a32e RK |
1 | /* |
2 | * segbuf.c - NILFS segment buffer | |
3 | * | |
4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | * Written by Ryusuke Konishi <ryusuke@osrg.net> | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <linux/buffer_head.h> | |
25 | #include <linux/writeback.h> | |
26 | #include <linux/crc32.h> | |
9c965bac | 27 | #include <linux/backing-dev.h> |
64b5a32e RK |
28 | #include "page.h" |
29 | #include "segbuf.h" | |
64b5a32e RK |
30 | |
31 | ||
9c965bac RK |
32 | struct nilfs_write_info { |
33 | struct the_nilfs *nilfs; | |
34 | struct bio *bio; | |
35 | int start, end; /* The region to be submitted */ | |
36 | int rest_blocks; | |
37 | int max_pages; | |
38 | int nr_vecs; | |
39 | sector_t blocknr; | |
40 | }; | |
41 | ||
42 | ||
64b5a32e RK |
43 | static struct kmem_cache *nilfs_segbuf_cachep; |
44 | ||
45 | static void nilfs_segbuf_init_once(void *obj) | |
46 | { | |
47 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
48 | } | |
49 | ||
50 | int __init nilfs_init_segbuf_cache(void) | |
51 | { | |
52 | nilfs_segbuf_cachep = | |
53 | kmem_cache_create("nilfs2_segbuf_cache", | |
54 | sizeof(struct nilfs_segment_buffer), | |
55 | 0, SLAB_RECLAIM_ACCOUNT, | |
56 | nilfs_segbuf_init_once); | |
57 | ||
58 | return (nilfs_segbuf_cachep == NULL) ? -ENOMEM : 0; | |
59 | } | |
60 | ||
61 | void nilfs_destroy_segbuf_cache(void) | |
62 | { | |
63 | kmem_cache_destroy(nilfs_segbuf_cachep); | |
64 | } | |
65 | ||
66 | struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *sb) | |
67 | { | |
68 | struct nilfs_segment_buffer *segbuf; | |
69 | ||
70 | segbuf = kmem_cache_alloc(nilfs_segbuf_cachep, GFP_NOFS); | |
71 | if (unlikely(!segbuf)) | |
72 | return NULL; | |
73 | ||
74 | segbuf->sb_super = sb; | |
75 | INIT_LIST_HEAD(&segbuf->sb_list); | |
76 | INIT_LIST_HEAD(&segbuf->sb_segsum_buffers); | |
77 | INIT_LIST_HEAD(&segbuf->sb_payload_buffers); | |
9284ad2a RK |
78 | |
79 | init_completion(&segbuf->sb_bio_event); | |
80 | atomic_set(&segbuf->sb_err, 0); | |
81 | segbuf->sb_nbio = 0; | |
82 | ||
64b5a32e RK |
83 | return segbuf; |
84 | } | |
85 | ||
86 | void nilfs_segbuf_free(struct nilfs_segment_buffer *segbuf) | |
87 | { | |
64b5a32e RK |
88 | kmem_cache_free(nilfs_segbuf_cachep, segbuf); |
89 | } | |
90 | ||
cece5520 | 91 | void nilfs_segbuf_map(struct nilfs_segment_buffer *segbuf, __u64 segnum, |
64b5a32e RK |
92 | unsigned long offset, struct the_nilfs *nilfs) |
93 | { | |
64b5a32e RK |
94 | segbuf->sb_segnum = segnum; |
95 | nilfs_get_segment_range(nilfs, segnum, &segbuf->sb_fseg_start, | |
96 | &segbuf->sb_fseg_end); | |
97 | ||
98 | segbuf->sb_pseg_start = segbuf->sb_fseg_start + offset; | |
99 | segbuf->sb_rest_blocks = | |
100 | segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1; | |
64b5a32e RK |
101 | } |
102 | ||
a694291a RK |
103 | /** |
104 | * nilfs_segbuf_map_cont - map a new log behind a given log | |
105 | * @segbuf: new segment buffer | |
106 | * @prev: segment buffer containing a log to be continued | |
107 | */ | |
108 | void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf, | |
109 | struct nilfs_segment_buffer *prev) | |
110 | { | |
111 | segbuf->sb_segnum = prev->sb_segnum; | |
112 | segbuf->sb_fseg_start = prev->sb_fseg_start; | |
113 | segbuf->sb_fseg_end = prev->sb_fseg_end; | |
114 | segbuf->sb_pseg_start = prev->sb_pseg_start + prev->sb_sum.nblocks; | |
115 | segbuf->sb_rest_blocks = | |
116 | segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1; | |
117 | } | |
118 | ||
64b5a32e RK |
119 | void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *segbuf, |
120 | __u64 nextnum, struct the_nilfs *nilfs) | |
121 | { | |
122 | segbuf->sb_nextnum = nextnum; | |
123 | segbuf->sb_sum.next = nilfs_get_segment_start_blocknr(nilfs, nextnum); | |
124 | } | |
125 | ||
126 | int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *segbuf) | |
127 | { | |
128 | struct buffer_head *bh; | |
129 | ||
130 | bh = sb_getblk(segbuf->sb_super, | |
131 | segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk); | |
132 | if (unlikely(!bh)) | |
133 | return -ENOMEM; | |
134 | ||
135 | nilfs_segbuf_add_segsum_buffer(segbuf, bh); | |
136 | return 0; | |
137 | } | |
138 | ||
139 | int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *segbuf, | |
140 | struct buffer_head **bhp) | |
141 | { | |
142 | struct buffer_head *bh; | |
143 | ||
144 | bh = sb_getblk(segbuf->sb_super, | |
145 | segbuf->sb_pseg_start + segbuf->sb_sum.nblocks); | |
146 | if (unlikely(!bh)) | |
147 | return -ENOMEM; | |
148 | ||
149 | nilfs_segbuf_add_payload_buffer(segbuf, bh); | |
150 | *bhp = bh; | |
151 | return 0; | |
152 | } | |
153 | ||
154 | int nilfs_segbuf_reset(struct nilfs_segment_buffer *segbuf, unsigned flags, | |
155 | time_t ctime) | |
156 | { | |
157 | int err; | |
158 | ||
159 | segbuf->sb_sum.nblocks = segbuf->sb_sum.nsumblk = 0; | |
160 | err = nilfs_segbuf_extend_segsum(segbuf); | |
161 | if (unlikely(err)) | |
162 | return err; | |
163 | ||
164 | segbuf->sb_sum.flags = flags; | |
165 | segbuf->sb_sum.sumbytes = sizeof(struct nilfs_segment_summary); | |
166 | segbuf->sb_sum.nfinfo = segbuf->sb_sum.nfileblk = 0; | |
167 | segbuf->sb_sum.ctime = ctime; | |
64b5a32e RK |
168 | return 0; |
169 | } | |
170 | ||
171 | /* | |
172 | * Setup segument summary | |
173 | */ | |
174 | void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *segbuf) | |
175 | { | |
176 | struct nilfs_segment_summary *raw_sum; | |
177 | struct buffer_head *bh_sum; | |
178 | ||
179 | bh_sum = list_entry(segbuf->sb_segsum_buffers.next, | |
180 | struct buffer_head, b_assoc_buffers); | |
181 | raw_sum = (struct nilfs_segment_summary *)bh_sum->b_data; | |
182 | ||
183 | raw_sum->ss_magic = cpu_to_le32(NILFS_SEGSUM_MAGIC); | |
184 | raw_sum->ss_bytes = cpu_to_le16(sizeof(*raw_sum)); | |
185 | raw_sum->ss_flags = cpu_to_le16(segbuf->sb_sum.flags); | |
186 | raw_sum->ss_seq = cpu_to_le64(segbuf->sb_sum.seg_seq); | |
187 | raw_sum->ss_create = cpu_to_le64(segbuf->sb_sum.ctime); | |
188 | raw_sum->ss_next = cpu_to_le64(segbuf->sb_sum.next); | |
189 | raw_sum->ss_nblocks = cpu_to_le32(segbuf->sb_sum.nblocks); | |
190 | raw_sum->ss_nfinfo = cpu_to_le32(segbuf->sb_sum.nfinfo); | |
191 | raw_sum->ss_sumbytes = cpu_to_le32(segbuf->sb_sum.sumbytes); | |
192 | raw_sum->ss_pad = 0; | |
193 | } | |
194 | ||
195 | /* | |
196 | * CRC calculation routines | |
197 | */ | |
198 | void nilfs_segbuf_fill_in_segsum_crc(struct nilfs_segment_buffer *segbuf, | |
199 | u32 seed) | |
200 | { | |
201 | struct buffer_head *bh; | |
202 | struct nilfs_segment_summary *raw_sum; | |
203 | unsigned long size, bytes = segbuf->sb_sum.sumbytes; | |
204 | u32 crc; | |
205 | ||
206 | bh = list_entry(segbuf->sb_segsum_buffers.next, struct buffer_head, | |
207 | b_assoc_buffers); | |
208 | ||
209 | raw_sum = (struct nilfs_segment_summary *)bh->b_data; | |
210 | size = min_t(unsigned long, bytes, bh->b_size); | |
211 | crc = crc32_le(seed, | |
212 | (unsigned char *)raw_sum + | |
213 | sizeof(raw_sum->ss_datasum) + sizeof(raw_sum->ss_sumsum), | |
214 | size - (sizeof(raw_sum->ss_datasum) + | |
215 | sizeof(raw_sum->ss_sumsum))); | |
216 | ||
217 | list_for_each_entry_continue(bh, &segbuf->sb_segsum_buffers, | |
218 | b_assoc_buffers) { | |
219 | bytes -= size; | |
220 | size = min_t(unsigned long, bytes, bh->b_size); | |
221 | crc = crc32_le(crc, bh->b_data, size); | |
222 | } | |
223 | raw_sum->ss_sumsum = cpu_to_le32(crc); | |
224 | } | |
225 | ||
226 | void nilfs_segbuf_fill_in_data_crc(struct nilfs_segment_buffer *segbuf, | |
227 | u32 seed) | |
228 | { | |
229 | struct buffer_head *bh; | |
230 | struct nilfs_segment_summary *raw_sum; | |
231 | void *kaddr; | |
232 | u32 crc; | |
233 | ||
234 | bh = list_entry(segbuf->sb_segsum_buffers.next, struct buffer_head, | |
235 | b_assoc_buffers); | |
236 | raw_sum = (struct nilfs_segment_summary *)bh->b_data; | |
237 | crc = crc32_le(seed, | |
238 | (unsigned char *)raw_sum + sizeof(raw_sum->ss_datasum), | |
239 | bh->b_size - sizeof(raw_sum->ss_datasum)); | |
240 | ||
241 | list_for_each_entry_continue(bh, &segbuf->sb_segsum_buffers, | |
242 | b_assoc_buffers) { | |
243 | crc = crc32_le(crc, bh->b_data, bh->b_size); | |
244 | } | |
245 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) { | |
246 | kaddr = kmap_atomic(bh->b_page, KM_USER0); | |
247 | crc = crc32_le(crc, kaddr + bh_offset(bh), bh->b_size); | |
248 | kunmap_atomic(kaddr, KM_USER0); | |
249 | } | |
250 | raw_sum->ss_datasum = cpu_to_le32(crc); | |
251 | } | |
252 | ||
e29df395 | 253 | static void nilfs_release_buffers(struct list_head *list) |
64b5a32e RK |
254 | { |
255 | struct buffer_head *bh, *n; | |
256 | ||
257 | list_for_each_entry_safe(bh, n, list, b_assoc_buffers) { | |
258 | list_del_init(&bh->b_assoc_buffers); | |
259 | if (buffer_nilfs_allocated(bh)) { | |
260 | struct page *clone_page = bh->b_page; | |
261 | ||
262 | /* remove clone page */ | |
263 | brelse(bh); | |
264 | page_cache_release(clone_page); /* for each bh */ | |
265 | if (page_count(clone_page) <= 2) { | |
266 | lock_page(clone_page); | |
267 | nilfs_free_private_page(clone_page); | |
268 | } | |
269 | continue; | |
270 | } | |
271 | brelse(bh); | |
272 | } | |
273 | } | |
274 | ||
e29df395 RK |
275 | static void nilfs_segbuf_clear(struct nilfs_segment_buffer *segbuf) |
276 | { | |
277 | nilfs_release_buffers(&segbuf->sb_segsum_buffers); | |
278 | nilfs_release_buffers(&segbuf->sb_payload_buffers); | |
279 | } | |
280 | ||
281 | /* | |
282 | * Iterators for segment buffers | |
283 | */ | |
284 | void nilfs_clear_logs(struct list_head *logs) | |
285 | { | |
286 | struct nilfs_segment_buffer *segbuf; | |
287 | ||
288 | list_for_each_entry(segbuf, logs, sb_list) | |
289 | nilfs_segbuf_clear(segbuf); | |
290 | } | |
291 | ||
292 | void nilfs_truncate_logs(struct list_head *logs, | |
293 | struct nilfs_segment_buffer *last) | |
294 | { | |
295 | struct nilfs_segment_buffer *n, *segbuf; | |
296 | ||
297 | segbuf = list_prepare_entry(last, logs, sb_list); | |
298 | list_for_each_entry_safe_continue(segbuf, n, logs, sb_list) { | |
299 | list_del_init(&segbuf->sb_list); | |
300 | nilfs_segbuf_clear(segbuf); | |
301 | nilfs_segbuf_free(segbuf); | |
302 | } | |
303 | } | |
304 | ||
305 | int nilfs_wait_on_logs(struct list_head *logs) | |
306 | { | |
307 | struct nilfs_segment_buffer *segbuf; | |
308 | int err; | |
309 | ||
310 | list_for_each_entry(segbuf, logs, sb_list) { | |
311 | err = nilfs_segbuf_wait(segbuf); | |
312 | if (err) | |
313 | return err; | |
314 | } | |
315 | return 0; | |
316 | } | |
317 | ||
64b5a32e RK |
318 | /* |
319 | * BIO operations | |
320 | */ | |
321 | static void nilfs_end_bio_write(struct bio *bio, int err) | |
322 | { | |
323 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9284ad2a | 324 | struct nilfs_segment_buffer *segbuf = bio->bi_private; |
64b5a32e RK |
325 | |
326 | if (err == -EOPNOTSUPP) { | |
327 | set_bit(BIO_EOPNOTSUPP, &bio->bi_flags); | |
328 | bio_put(bio); | |
329 | /* to be detected by submit_seg_bio() */ | |
330 | } | |
331 | ||
332 | if (!uptodate) | |
9284ad2a | 333 | atomic_inc(&segbuf->sb_err); |
64b5a32e RK |
334 | |
335 | bio_put(bio); | |
9284ad2a | 336 | complete(&segbuf->sb_bio_event); |
64b5a32e RK |
337 | } |
338 | ||
9284ad2a RK |
339 | static int nilfs_segbuf_submit_bio(struct nilfs_segment_buffer *segbuf, |
340 | struct nilfs_write_info *wi, int mode) | |
64b5a32e RK |
341 | { |
342 | struct bio *bio = wi->bio; | |
343 | int err; | |
344 | ||
9c965bac | 345 | if (segbuf->sb_nbio > 0 && bdi_write_congested(wi->nilfs->ns_bdi)) { |
9284ad2a RK |
346 | wait_for_completion(&segbuf->sb_bio_event); |
347 | segbuf->sb_nbio--; | |
348 | if (unlikely(atomic_read(&segbuf->sb_err))) { | |
64b5a32e RK |
349 | bio_put(bio); |
350 | err = -EIO; | |
351 | goto failed; | |
352 | } | |
353 | } | |
354 | ||
355 | bio->bi_end_io = nilfs_end_bio_write; | |
9284ad2a | 356 | bio->bi_private = segbuf; |
64b5a32e RK |
357 | bio_get(bio); |
358 | submit_bio(mode, bio); | |
359 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) { | |
360 | bio_put(bio); | |
361 | err = -EOPNOTSUPP; | |
362 | goto failed; | |
363 | } | |
9284ad2a | 364 | segbuf->sb_nbio++; |
64b5a32e RK |
365 | bio_put(bio); |
366 | ||
367 | wi->bio = NULL; | |
368 | wi->rest_blocks -= wi->end - wi->start; | |
369 | wi->nr_vecs = min(wi->max_pages, wi->rest_blocks); | |
370 | wi->start = wi->end; | |
371 | return 0; | |
372 | ||
373 | failed: | |
374 | wi->bio = NULL; | |
375 | return err; | |
376 | } | |
377 | ||
378 | /** | |
9c965bac RK |
379 | * nilfs_alloc_seg_bio - allocate a new bio for writing log |
380 | * @nilfs: nilfs object | |
381 | * @start: start block number of the bio | |
64b5a32e RK |
382 | * @nr_vecs: request size of page vector. |
383 | * | |
64b5a32e RK |
384 | * Return Value: On success, pointer to the struct bio is returned. |
385 | * On error, NULL is returned. | |
386 | */ | |
9c965bac | 387 | static struct bio *nilfs_alloc_seg_bio(struct the_nilfs *nilfs, sector_t start, |
64b5a32e RK |
388 | int nr_vecs) |
389 | { | |
390 | struct bio *bio; | |
391 | ||
c1b353f0 | 392 | bio = bio_alloc(GFP_NOIO, nr_vecs); |
64b5a32e RK |
393 | if (bio == NULL) { |
394 | while (!bio && (nr_vecs >>= 1)) | |
c1b353f0 | 395 | bio = bio_alloc(GFP_NOIO, nr_vecs); |
64b5a32e RK |
396 | } |
397 | if (likely(bio)) { | |
9c965bac RK |
398 | bio->bi_bdev = nilfs->ns_bdev; |
399 | bio->bi_sector = start << (nilfs->ns_blocksize_bits - 9); | |
64b5a32e RK |
400 | } |
401 | return bio; | |
402 | } | |
403 | ||
9c965bac RK |
404 | static void nilfs_segbuf_prepare_write(struct nilfs_segment_buffer *segbuf, |
405 | struct nilfs_write_info *wi) | |
64b5a32e RK |
406 | { |
407 | wi->bio = NULL; | |
408 | wi->rest_blocks = segbuf->sb_sum.nblocks; | |
9c965bac | 409 | wi->max_pages = bio_get_nr_vecs(wi->nilfs->ns_bdev); |
64b5a32e RK |
410 | wi->nr_vecs = min(wi->max_pages, wi->rest_blocks); |
411 | wi->start = wi->end = 0; | |
64b5a32e | 412 | wi->blocknr = segbuf->sb_pseg_start; |
64b5a32e RK |
413 | } |
414 | ||
9284ad2a RK |
415 | static int nilfs_segbuf_submit_bh(struct nilfs_segment_buffer *segbuf, |
416 | struct nilfs_write_info *wi, | |
417 | struct buffer_head *bh, int mode) | |
64b5a32e RK |
418 | { |
419 | int len, err; | |
420 | ||
421 | BUG_ON(wi->nr_vecs <= 0); | |
422 | repeat: | |
423 | if (!wi->bio) { | |
9c965bac | 424 | wi->bio = nilfs_alloc_seg_bio(wi->nilfs, wi->blocknr + wi->end, |
64b5a32e RK |
425 | wi->nr_vecs); |
426 | if (unlikely(!wi->bio)) | |
427 | return -ENOMEM; | |
428 | } | |
429 | ||
430 | len = bio_add_page(wi->bio, bh->b_page, bh->b_size, bh_offset(bh)); | |
431 | if (len == bh->b_size) { | |
432 | wi->end++; | |
433 | return 0; | |
434 | } | |
435 | /* bio is FULL */ | |
9284ad2a | 436 | err = nilfs_segbuf_submit_bio(segbuf, wi, mode); |
64b5a32e RK |
437 | /* never submit current bh */ |
438 | if (likely(!err)) | |
439 | goto repeat; | |
440 | return err; | |
441 | } | |
442 | ||
9c965bac RK |
443 | /** |
444 | * nilfs_segbuf_write - submit write requests of a log | |
445 | * @segbuf: buffer storing a log to be written | |
446 | * @nilfs: nilfs object | |
447 | * | |
448 | * Return Value: On Success, 0 is returned. On Error, one of the following | |
449 | * negative error code is returned. | |
450 | * | |
451 | * %-EIO - I/O error | |
452 | * | |
453 | * %-ENOMEM - Insufficient memory available. | |
454 | */ | |
64b5a32e | 455 | int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf, |
9c965bac | 456 | struct the_nilfs *nilfs) |
64b5a32e | 457 | { |
9c965bac | 458 | struct nilfs_write_info wi; |
64b5a32e | 459 | struct buffer_head *bh; |
5f1586d0 | 460 | int res = 0, rw = WRITE; |
64b5a32e | 461 | |
9c965bac RK |
462 | wi.nilfs = nilfs; |
463 | nilfs_segbuf_prepare_write(segbuf, &wi); | |
464 | ||
64b5a32e | 465 | list_for_each_entry(bh, &segbuf->sb_segsum_buffers, b_assoc_buffers) { |
9c965bac | 466 | res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, rw); |
64b5a32e RK |
467 | if (unlikely(res)) |
468 | goto failed_bio; | |
469 | } | |
470 | ||
471 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) { | |
9c965bac | 472 | res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, rw); |
64b5a32e RK |
473 | if (unlikely(res)) |
474 | goto failed_bio; | |
475 | } | |
476 | ||
9c965bac | 477 | if (wi.bio) { |
64b5a32e RK |
478 | /* |
479 | * Last BIO is always sent through the following | |
480 | * submission. | |
481 | */ | |
30bda0b8 | 482 | rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG); |
9c965bac | 483 | res = nilfs_segbuf_submit_bio(segbuf, &wi, rw); |
64b5a32e RK |
484 | } |
485 | ||
64b5a32e | 486 | failed_bio: |
5f1586d0 | 487 | return res; |
64b5a32e RK |
488 | } |
489 | ||
490 | /** | |
491 | * nilfs_segbuf_wait - wait for completion of requested BIOs | |
9284ad2a | 492 | * @segbuf: segment buffer |
64b5a32e RK |
493 | * |
494 | * Return Value: On Success, 0 is returned. On Error, one of the following | |
495 | * negative error code is returned. | |
496 | * | |
497 | * %-EIO - I/O error | |
498 | */ | |
9284ad2a | 499 | int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf) |
64b5a32e RK |
500 | { |
501 | int err = 0; | |
502 | ||
9284ad2a | 503 | if (!segbuf->sb_nbio) |
64b5a32e RK |
504 | return 0; |
505 | ||
506 | do { | |
9284ad2a RK |
507 | wait_for_completion(&segbuf->sb_bio_event); |
508 | } while (--segbuf->sb_nbio > 0); | |
64b5a32e | 509 | |
9284ad2a | 510 | if (unlikely(atomic_read(&segbuf->sb_err) > 0)) { |
64b5a32e RK |
511 | printk(KERN_ERR "NILFS: IO error writing segment\n"); |
512 | err = -EIO; | |
64b5a32e RK |
513 | } |
514 | return err; | |
515 | } |