Commit | Line | Data |
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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> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
64b5a32e RK |
29 | #include "page.h" |
30 | #include "segbuf.h" | |
64b5a32e RK |
31 | |
32 | ||
9c965bac RK |
33 | struct nilfs_write_info { |
34 | struct the_nilfs *nilfs; | |
35 | struct bio *bio; | |
55480a06 | 36 | int start, end; /* The region to be submitted */ |
9c965bac RK |
37 | int rest_blocks; |
38 | int max_pages; | |
39 | int nr_vecs; | |
40 | sector_t blocknr; | |
41 | }; | |
42 | ||
43 | ||
d1c6b72a RK |
44 | static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf, |
45 | struct the_nilfs *nilfs); | |
46 | static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf); | |
47 | ||
48 | ||
64b5a32e RK |
49 | static struct kmem_cache *nilfs_segbuf_cachep; |
50 | ||
51 | static void nilfs_segbuf_init_once(void *obj) | |
52 | { | |
53 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
54 | } | |
55 | ||
56 | int __init nilfs_init_segbuf_cache(void) | |
57 | { | |
58 | nilfs_segbuf_cachep = | |
59 | kmem_cache_create("nilfs2_segbuf_cache", | |
60 | sizeof(struct nilfs_segment_buffer), | |
61 | 0, SLAB_RECLAIM_ACCOUNT, | |
62 | nilfs_segbuf_init_once); | |
63 | ||
64 | return (nilfs_segbuf_cachep == NULL) ? -ENOMEM : 0; | |
65 | } | |
66 | ||
67 | void nilfs_destroy_segbuf_cache(void) | |
68 | { | |
69 | kmem_cache_destroy(nilfs_segbuf_cachep); | |
70 | } | |
71 | ||
72 | struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *sb) | |
73 | { | |
74 | struct nilfs_segment_buffer *segbuf; | |
75 | ||
76 | segbuf = kmem_cache_alloc(nilfs_segbuf_cachep, GFP_NOFS); | |
77 | if (unlikely(!segbuf)) | |
78 | return NULL; | |
79 | ||
80 | segbuf->sb_super = sb; | |
81 | INIT_LIST_HEAD(&segbuf->sb_list); | |
82 | INIT_LIST_HEAD(&segbuf->sb_segsum_buffers); | |
83 | INIT_LIST_HEAD(&segbuf->sb_payload_buffers); | |
9284ad2a RK |
84 | |
85 | init_completion(&segbuf->sb_bio_event); | |
86 | atomic_set(&segbuf->sb_err, 0); | |
87 | segbuf->sb_nbio = 0; | |
88 | ||
64b5a32e RK |
89 | return segbuf; |
90 | } | |
91 | ||
92 | void nilfs_segbuf_free(struct nilfs_segment_buffer *segbuf) | |
93 | { | |
64b5a32e RK |
94 | kmem_cache_free(nilfs_segbuf_cachep, segbuf); |
95 | } | |
96 | ||
cece5520 | 97 | void nilfs_segbuf_map(struct nilfs_segment_buffer *segbuf, __u64 segnum, |
64b5a32e RK |
98 | unsigned long offset, struct the_nilfs *nilfs) |
99 | { | |
64b5a32e RK |
100 | segbuf->sb_segnum = segnum; |
101 | nilfs_get_segment_range(nilfs, segnum, &segbuf->sb_fseg_start, | |
102 | &segbuf->sb_fseg_end); | |
103 | ||
104 | segbuf->sb_pseg_start = segbuf->sb_fseg_start + offset; | |
105 | segbuf->sb_rest_blocks = | |
106 | segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1; | |
64b5a32e RK |
107 | } |
108 | ||
a694291a RK |
109 | /** |
110 | * nilfs_segbuf_map_cont - map a new log behind a given log | |
111 | * @segbuf: new segment buffer | |
112 | * @prev: segment buffer containing a log to be continued | |
113 | */ | |
114 | void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf, | |
115 | struct nilfs_segment_buffer *prev) | |
116 | { | |
117 | segbuf->sb_segnum = prev->sb_segnum; | |
118 | segbuf->sb_fseg_start = prev->sb_fseg_start; | |
119 | segbuf->sb_fseg_end = prev->sb_fseg_end; | |
120 | segbuf->sb_pseg_start = prev->sb_pseg_start + prev->sb_sum.nblocks; | |
121 | segbuf->sb_rest_blocks = | |
122 | segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1; | |
123 | } | |
124 | ||
64b5a32e RK |
125 | void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *segbuf, |
126 | __u64 nextnum, struct the_nilfs *nilfs) | |
127 | { | |
128 | segbuf->sb_nextnum = nextnum; | |
129 | segbuf->sb_sum.next = nilfs_get_segment_start_blocknr(nilfs, nextnum); | |
130 | } | |
131 | ||
132 | int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *segbuf) | |
133 | { | |
134 | struct buffer_head *bh; | |
135 | ||
136 | bh = sb_getblk(segbuf->sb_super, | |
137 | segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk); | |
138 | if (unlikely(!bh)) | |
139 | return -ENOMEM; | |
140 | ||
141 | nilfs_segbuf_add_segsum_buffer(segbuf, bh); | |
142 | return 0; | |
143 | } | |
144 | ||
145 | int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *segbuf, | |
146 | struct buffer_head **bhp) | |
147 | { | |
148 | struct buffer_head *bh; | |
149 | ||
150 | bh = sb_getblk(segbuf->sb_super, | |
151 | segbuf->sb_pseg_start + segbuf->sb_sum.nblocks); | |
152 | if (unlikely(!bh)) | |
153 | return -ENOMEM; | |
154 | ||
155 | nilfs_segbuf_add_payload_buffer(segbuf, bh); | |
156 | *bhp = bh; | |
157 | return 0; | |
158 | } | |
159 | ||
160 | int nilfs_segbuf_reset(struct nilfs_segment_buffer *segbuf, unsigned flags, | |
161 | time_t ctime) | |
162 | { | |
163 | int err; | |
164 | ||
165 | segbuf->sb_sum.nblocks = segbuf->sb_sum.nsumblk = 0; | |
166 | err = nilfs_segbuf_extend_segsum(segbuf); | |
167 | if (unlikely(err)) | |
168 | return err; | |
169 | ||
170 | segbuf->sb_sum.flags = flags; | |
171 | segbuf->sb_sum.sumbytes = sizeof(struct nilfs_segment_summary); | |
172 | segbuf->sb_sum.nfinfo = segbuf->sb_sum.nfileblk = 0; | |
173 | segbuf->sb_sum.ctime = ctime; | |
64b5a32e RK |
174 | return 0; |
175 | } | |
176 | ||
177 | /* | |
7a65004b | 178 | * Setup segment summary |
64b5a32e RK |
179 | */ |
180 | void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *segbuf) | |
181 | { | |
182 | struct nilfs_segment_summary *raw_sum; | |
183 | struct buffer_head *bh_sum; | |
184 | ||
185 | bh_sum = list_entry(segbuf->sb_segsum_buffers.next, | |
186 | struct buffer_head, b_assoc_buffers); | |
187 | raw_sum = (struct nilfs_segment_summary *)bh_sum->b_data; | |
188 | ||
189 | raw_sum->ss_magic = cpu_to_le32(NILFS_SEGSUM_MAGIC); | |
190 | raw_sum->ss_bytes = cpu_to_le16(sizeof(*raw_sum)); | |
191 | raw_sum->ss_flags = cpu_to_le16(segbuf->sb_sum.flags); | |
192 | raw_sum->ss_seq = cpu_to_le64(segbuf->sb_sum.seg_seq); | |
193 | raw_sum->ss_create = cpu_to_le64(segbuf->sb_sum.ctime); | |
194 | raw_sum->ss_next = cpu_to_le64(segbuf->sb_sum.next); | |
195 | raw_sum->ss_nblocks = cpu_to_le32(segbuf->sb_sum.nblocks); | |
196 | raw_sum->ss_nfinfo = cpu_to_le32(segbuf->sb_sum.nfinfo); | |
197 | raw_sum->ss_sumbytes = cpu_to_le32(segbuf->sb_sum.sumbytes); | |
198 | raw_sum->ss_pad = 0; | |
199 | } | |
200 | ||
201 | /* | |
202 | * CRC calculation routines | |
203 | */ | |
204 | void nilfs_segbuf_fill_in_segsum_crc(struct nilfs_segment_buffer *segbuf, | |
205 | u32 seed) | |
206 | { | |
207 | struct buffer_head *bh; | |
208 | struct nilfs_segment_summary *raw_sum; | |
209 | unsigned long size, bytes = segbuf->sb_sum.sumbytes; | |
210 | u32 crc; | |
211 | ||
212 | bh = list_entry(segbuf->sb_segsum_buffers.next, struct buffer_head, | |
213 | b_assoc_buffers); | |
214 | ||
215 | raw_sum = (struct nilfs_segment_summary *)bh->b_data; | |
216 | size = min_t(unsigned long, bytes, bh->b_size); | |
217 | crc = crc32_le(seed, | |
218 | (unsigned char *)raw_sum + | |
219 | sizeof(raw_sum->ss_datasum) + sizeof(raw_sum->ss_sumsum), | |
220 | size - (sizeof(raw_sum->ss_datasum) + | |
221 | sizeof(raw_sum->ss_sumsum))); | |
222 | ||
223 | list_for_each_entry_continue(bh, &segbuf->sb_segsum_buffers, | |
224 | b_assoc_buffers) { | |
225 | bytes -= size; | |
226 | size = min_t(unsigned long, bytes, bh->b_size); | |
227 | crc = crc32_le(crc, bh->b_data, size); | |
228 | } | |
229 | raw_sum->ss_sumsum = cpu_to_le32(crc); | |
230 | } | |
231 | ||
232 | void nilfs_segbuf_fill_in_data_crc(struct nilfs_segment_buffer *segbuf, | |
233 | u32 seed) | |
234 | { | |
235 | struct buffer_head *bh; | |
236 | struct nilfs_segment_summary *raw_sum; | |
237 | void *kaddr; | |
238 | u32 crc; | |
239 | ||
240 | bh = list_entry(segbuf->sb_segsum_buffers.next, struct buffer_head, | |
241 | b_assoc_buffers); | |
242 | raw_sum = (struct nilfs_segment_summary *)bh->b_data; | |
243 | crc = crc32_le(seed, | |
244 | (unsigned char *)raw_sum + sizeof(raw_sum->ss_datasum), | |
245 | bh->b_size - sizeof(raw_sum->ss_datasum)); | |
246 | ||
247 | list_for_each_entry_continue(bh, &segbuf->sb_segsum_buffers, | |
248 | b_assoc_buffers) { | |
249 | crc = crc32_le(crc, bh->b_data, bh->b_size); | |
250 | } | |
251 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) { | |
252 | kaddr = kmap_atomic(bh->b_page, KM_USER0); | |
253 | crc = crc32_le(crc, kaddr + bh_offset(bh), bh->b_size); | |
254 | kunmap_atomic(kaddr, KM_USER0); | |
255 | } | |
256 | raw_sum->ss_datasum = cpu_to_le32(crc); | |
257 | } | |
258 | ||
e29df395 | 259 | static void nilfs_release_buffers(struct list_head *list) |
64b5a32e RK |
260 | { |
261 | struct buffer_head *bh, *n; | |
262 | ||
263 | list_for_each_entry_safe(bh, n, list, b_assoc_buffers) { | |
264 | list_del_init(&bh->b_assoc_buffers); | |
265 | if (buffer_nilfs_allocated(bh)) { | |
266 | struct page *clone_page = bh->b_page; | |
267 | ||
268 | /* remove clone page */ | |
269 | brelse(bh); | |
270 | page_cache_release(clone_page); /* for each bh */ | |
271 | if (page_count(clone_page) <= 2) { | |
272 | lock_page(clone_page); | |
273 | nilfs_free_private_page(clone_page); | |
274 | } | |
275 | continue; | |
276 | } | |
277 | brelse(bh); | |
278 | } | |
279 | } | |
280 | ||
e29df395 RK |
281 | static void nilfs_segbuf_clear(struct nilfs_segment_buffer *segbuf) |
282 | { | |
283 | nilfs_release_buffers(&segbuf->sb_segsum_buffers); | |
284 | nilfs_release_buffers(&segbuf->sb_payload_buffers); | |
285 | } | |
286 | ||
287 | /* | |
288 | * Iterators for segment buffers | |
289 | */ | |
290 | void nilfs_clear_logs(struct list_head *logs) | |
291 | { | |
292 | struct nilfs_segment_buffer *segbuf; | |
293 | ||
294 | list_for_each_entry(segbuf, logs, sb_list) | |
295 | nilfs_segbuf_clear(segbuf); | |
296 | } | |
297 | ||
298 | void nilfs_truncate_logs(struct list_head *logs, | |
299 | struct nilfs_segment_buffer *last) | |
300 | { | |
301 | struct nilfs_segment_buffer *n, *segbuf; | |
302 | ||
303 | segbuf = list_prepare_entry(last, logs, sb_list); | |
304 | list_for_each_entry_safe_continue(segbuf, n, logs, sb_list) { | |
305 | list_del_init(&segbuf->sb_list); | |
306 | nilfs_segbuf_clear(segbuf); | |
307 | nilfs_segbuf_free(segbuf); | |
308 | } | |
309 | } | |
310 | ||
d1c6b72a RK |
311 | int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs) |
312 | { | |
313 | struct nilfs_segment_buffer *segbuf; | |
314 | int ret = 0; | |
315 | ||
316 | list_for_each_entry(segbuf, logs, sb_list) { | |
317 | ret = nilfs_segbuf_write(segbuf, nilfs); | |
318 | if (ret) | |
319 | break; | |
320 | } | |
321 | return ret; | |
322 | } | |
323 | ||
e29df395 RK |
324 | int nilfs_wait_on_logs(struct list_head *logs) |
325 | { | |
326 | struct nilfs_segment_buffer *segbuf; | |
d067633b | 327 | int err, ret = 0; |
e29df395 RK |
328 | |
329 | list_for_each_entry(segbuf, logs, sb_list) { | |
330 | err = nilfs_segbuf_wait(segbuf); | |
d067633b RK |
331 | if (err && !ret) |
332 | ret = err; | |
e29df395 | 333 | } |
d067633b | 334 | return ret; |
e29df395 RK |
335 | } |
336 | ||
64b5a32e RK |
337 | /* |
338 | * BIO operations | |
339 | */ | |
340 | static void nilfs_end_bio_write(struct bio *bio, int err) | |
341 | { | |
342 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9284ad2a | 343 | struct nilfs_segment_buffer *segbuf = bio->bi_private; |
64b5a32e RK |
344 | |
345 | if (err == -EOPNOTSUPP) { | |
346 | set_bit(BIO_EOPNOTSUPP, &bio->bi_flags); | |
347 | bio_put(bio); | |
348 | /* to be detected by submit_seg_bio() */ | |
349 | } | |
350 | ||
351 | if (!uptodate) | |
9284ad2a | 352 | atomic_inc(&segbuf->sb_err); |
64b5a32e RK |
353 | |
354 | bio_put(bio); | |
9284ad2a | 355 | complete(&segbuf->sb_bio_event); |
64b5a32e RK |
356 | } |
357 | ||
9284ad2a RK |
358 | static int nilfs_segbuf_submit_bio(struct nilfs_segment_buffer *segbuf, |
359 | struct nilfs_write_info *wi, int mode) | |
64b5a32e RK |
360 | { |
361 | struct bio *bio = wi->bio; | |
362 | int err; | |
363 | ||
9c965bac | 364 | if (segbuf->sb_nbio > 0 && bdi_write_congested(wi->nilfs->ns_bdi)) { |
9284ad2a RK |
365 | wait_for_completion(&segbuf->sb_bio_event); |
366 | segbuf->sb_nbio--; | |
367 | if (unlikely(atomic_read(&segbuf->sb_err))) { | |
64b5a32e RK |
368 | bio_put(bio); |
369 | err = -EIO; | |
370 | goto failed; | |
371 | } | |
372 | } | |
373 | ||
374 | bio->bi_end_io = nilfs_end_bio_write; | |
9284ad2a | 375 | bio->bi_private = segbuf; |
64b5a32e RK |
376 | bio_get(bio); |
377 | submit_bio(mode, bio); | |
378 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) { | |
379 | bio_put(bio); | |
380 | err = -EOPNOTSUPP; | |
381 | goto failed; | |
382 | } | |
9284ad2a | 383 | segbuf->sb_nbio++; |
64b5a32e RK |
384 | bio_put(bio); |
385 | ||
386 | wi->bio = NULL; | |
387 | wi->rest_blocks -= wi->end - wi->start; | |
388 | wi->nr_vecs = min(wi->max_pages, wi->rest_blocks); | |
389 | wi->start = wi->end; | |
390 | return 0; | |
391 | ||
392 | failed: | |
393 | wi->bio = NULL; | |
394 | return err; | |
395 | } | |
396 | ||
397 | /** | |
9c965bac RK |
398 | * nilfs_alloc_seg_bio - allocate a new bio for writing log |
399 | * @nilfs: nilfs object | |
400 | * @start: start block number of the bio | |
64b5a32e RK |
401 | * @nr_vecs: request size of page vector. |
402 | * | |
64b5a32e RK |
403 | * Return Value: On success, pointer to the struct bio is returned. |
404 | * On error, NULL is returned. | |
405 | */ | |
9c965bac | 406 | static struct bio *nilfs_alloc_seg_bio(struct the_nilfs *nilfs, sector_t start, |
64b5a32e RK |
407 | int nr_vecs) |
408 | { | |
409 | struct bio *bio; | |
410 | ||
c1b353f0 | 411 | bio = bio_alloc(GFP_NOIO, nr_vecs); |
64b5a32e RK |
412 | if (bio == NULL) { |
413 | while (!bio && (nr_vecs >>= 1)) | |
c1b353f0 | 414 | bio = bio_alloc(GFP_NOIO, nr_vecs); |
64b5a32e RK |
415 | } |
416 | if (likely(bio)) { | |
9c965bac RK |
417 | bio->bi_bdev = nilfs->ns_bdev; |
418 | bio->bi_sector = start << (nilfs->ns_blocksize_bits - 9); | |
64b5a32e RK |
419 | } |
420 | return bio; | |
421 | } | |
422 | ||
9c965bac RK |
423 | static void nilfs_segbuf_prepare_write(struct nilfs_segment_buffer *segbuf, |
424 | struct nilfs_write_info *wi) | |
64b5a32e RK |
425 | { |
426 | wi->bio = NULL; | |
427 | wi->rest_blocks = segbuf->sb_sum.nblocks; | |
9c965bac | 428 | wi->max_pages = bio_get_nr_vecs(wi->nilfs->ns_bdev); |
64b5a32e RK |
429 | wi->nr_vecs = min(wi->max_pages, wi->rest_blocks); |
430 | wi->start = wi->end = 0; | |
64b5a32e | 431 | wi->blocknr = segbuf->sb_pseg_start; |
64b5a32e RK |
432 | } |
433 | ||
9284ad2a RK |
434 | static int nilfs_segbuf_submit_bh(struct nilfs_segment_buffer *segbuf, |
435 | struct nilfs_write_info *wi, | |
436 | struct buffer_head *bh, int mode) | |
64b5a32e RK |
437 | { |
438 | int len, err; | |
439 | ||
440 | BUG_ON(wi->nr_vecs <= 0); | |
441 | repeat: | |
442 | if (!wi->bio) { | |
9c965bac | 443 | wi->bio = nilfs_alloc_seg_bio(wi->nilfs, wi->blocknr + wi->end, |
64b5a32e RK |
444 | wi->nr_vecs); |
445 | if (unlikely(!wi->bio)) | |
446 | return -ENOMEM; | |
447 | } | |
448 | ||
449 | len = bio_add_page(wi->bio, bh->b_page, bh->b_size, bh_offset(bh)); | |
450 | if (len == bh->b_size) { | |
451 | wi->end++; | |
452 | return 0; | |
453 | } | |
454 | /* bio is FULL */ | |
9284ad2a | 455 | err = nilfs_segbuf_submit_bio(segbuf, wi, mode); |
64b5a32e RK |
456 | /* never submit current bh */ |
457 | if (likely(!err)) | |
458 | goto repeat; | |
459 | return err; | |
460 | } | |
461 | ||
9c965bac RK |
462 | /** |
463 | * nilfs_segbuf_write - submit write requests of a log | |
464 | * @segbuf: buffer storing a log to be written | |
465 | * @nilfs: nilfs object | |
466 | * | |
467 | * Return Value: On Success, 0 is returned. On Error, one of the following | |
468 | * negative error code is returned. | |
469 | * | |
470 | * %-EIO - I/O error | |
471 | * | |
472 | * %-ENOMEM - Insufficient memory available. | |
473 | */ | |
6c477d44 RK |
474 | static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf, |
475 | struct the_nilfs *nilfs) | |
64b5a32e | 476 | { |
9c965bac | 477 | struct nilfs_write_info wi; |
64b5a32e | 478 | struct buffer_head *bh; |
5f1586d0 | 479 | int res = 0, rw = WRITE; |
64b5a32e | 480 | |
9c965bac RK |
481 | wi.nilfs = nilfs; |
482 | nilfs_segbuf_prepare_write(segbuf, &wi); | |
483 | ||
64b5a32e | 484 | list_for_each_entry(bh, &segbuf->sb_segsum_buffers, b_assoc_buffers) { |
9c965bac | 485 | res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, rw); |
64b5a32e RK |
486 | if (unlikely(res)) |
487 | goto failed_bio; | |
488 | } | |
489 | ||
490 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) { | |
9c965bac | 491 | res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, rw); |
64b5a32e RK |
492 | if (unlikely(res)) |
493 | goto failed_bio; | |
494 | } | |
495 | ||
9c965bac | 496 | if (wi.bio) { |
64b5a32e RK |
497 | /* |
498 | * Last BIO is always sent through the following | |
499 | * submission. | |
500 | */ | |
30bda0b8 | 501 | rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG); |
9c965bac | 502 | res = nilfs_segbuf_submit_bio(segbuf, &wi, rw); |
64b5a32e RK |
503 | } |
504 | ||
64b5a32e | 505 | failed_bio: |
5f1586d0 | 506 | return res; |
64b5a32e RK |
507 | } |
508 | ||
509 | /** | |
510 | * nilfs_segbuf_wait - wait for completion of requested BIOs | |
9284ad2a | 511 | * @segbuf: segment buffer |
64b5a32e RK |
512 | * |
513 | * Return Value: On Success, 0 is returned. On Error, one of the following | |
514 | * negative error code is returned. | |
515 | * | |
516 | * %-EIO - I/O error | |
517 | */ | |
6c477d44 | 518 | static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf) |
64b5a32e RK |
519 | { |
520 | int err = 0; | |
521 | ||
9284ad2a | 522 | if (!segbuf->sb_nbio) |
64b5a32e RK |
523 | return 0; |
524 | ||
525 | do { | |
9284ad2a RK |
526 | wait_for_completion(&segbuf->sb_bio_event); |
527 | } while (--segbuf->sb_nbio > 0); | |
64b5a32e | 528 | |
9284ad2a | 529 | if (unlikely(atomic_read(&segbuf->sb_err) > 0)) { |
64b5a32e RK |
530 | printk(KERN_ERR "NILFS: IO error writing segment\n"); |
531 | err = -EIO; | |
64b5a32e RK |
532 | } |
533 | return err; | |
534 | } |