Commit | Line | Data |
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ae98043f | 1 | // SPDX-License-Identifier: GPL-2.0+ |
64b5a32e | 2 | /* |
94ee1d91 | 3 | * NILFS segment buffer |
64b5a32e RK |
4 | * |
5 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
6 | * | |
4b420ab4 | 7 | * Written by Ryusuke Konishi. |
64b5a32e RK |
8 | * |
9 | */ | |
10 | ||
11 | #include <linux/buffer_head.h> | |
12 | #include <linux/writeback.h> | |
13 | #include <linux/crc32.h> | |
9c965bac | 14 | #include <linux/backing-dev.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
64b5a32e RK |
16 | #include "page.h" |
17 | #include "segbuf.h" | |
64b5a32e RK |
18 | |
19 | ||
9c965bac RK |
20 | struct nilfs_write_info { |
21 | struct the_nilfs *nilfs; | |
22 | struct bio *bio; | |
55480a06 | 23 | int start, end; /* The region to be submitted */ |
9c965bac RK |
24 | int rest_blocks; |
25 | int max_pages; | |
26 | int nr_vecs; | |
27 | sector_t blocknr; | |
28 | }; | |
29 | ||
d1c6b72a RK |
30 | static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf, |
31 | struct the_nilfs *nilfs); | |
32 | static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf); | |
33 | ||
64b5a32e RK |
34 | struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *sb) |
35 | { | |
36 | struct nilfs_segment_buffer *segbuf; | |
37 | ||
38 | segbuf = kmem_cache_alloc(nilfs_segbuf_cachep, GFP_NOFS); | |
39 | if (unlikely(!segbuf)) | |
40 | return NULL; | |
41 | ||
42 | segbuf->sb_super = sb; | |
43 | INIT_LIST_HEAD(&segbuf->sb_list); | |
44 | INIT_LIST_HEAD(&segbuf->sb_segsum_buffers); | |
45 | INIT_LIST_HEAD(&segbuf->sb_payload_buffers); | |
1e2b68bf | 46 | segbuf->sb_super_root = NULL; |
9284ad2a RK |
47 | |
48 | init_completion(&segbuf->sb_bio_event); | |
49 | atomic_set(&segbuf->sb_err, 0); | |
50 | segbuf->sb_nbio = 0; | |
51 | ||
64b5a32e RK |
52 | return segbuf; |
53 | } | |
54 | ||
55 | void nilfs_segbuf_free(struct nilfs_segment_buffer *segbuf) | |
56 | { | |
64b5a32e RK |
57 | kmem_cache_free(nilfs_segbuf_cachep, segbuf); |
58 | } | |
59 | ||
cece5520 | 60 | void nilfs_segbuf_map(struct nilfs_segment_buffer *segbuf, __u64 segnum, |
64b5a32e RK |
61 | unsigned long offset, struct the_nilfs *nilfs) |
62 | { | |
64b5a32e RK |
63 | segbuf->sb_segnum = segnum; |
64 | nilfs_get_segment_range(nilfs, segnum, &segbuf->sb_fseg_start, | |
65 | &segbuf->sb_fseg_end); | |
66 | ||
67 | segbuf->sb_pseg_start = segbuf->sb_fseg_start + offset; | |
68 | segbuf->sb_rest_blocks = | |
69 | segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1; | |
64b5a32e RK |
70 | } |
71 | ||
a694291a RK |
72 | /** |
73 | * nilfs_segbuf_map_cont - map a new log behind a given log | |
74 | * @segbuf: new segment buffer | |
75 | * @prev: segment buffer containing a log to be continued | |
76 | */ | |
77 | void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf, | |
78 | struct nilfs_segment_buffer *prev) | |
79 | { | |
80 | segbuf->sb_segnum = prev->sb_segnum; | |
81 | segbuf->sb_fseg_start = prev->sb_fseg_start; | |
82 | segbuf->sb_fseg_end = prev->sb_fseg_end; | |
83 | segbuf->sb_pseg_start = prev->sb_pseg_start + prev->sb_sum.nblocks; | |
84 | segbuf->sb_rest_blocks = | |
85 | segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1; | |
86 | } | |
87 | ||
64b5a32e RK |
88 | void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *segbuf, |
89 | __u64 nextnum, struct the_nilfs *nilfs) | |
90 | { | |
91 | segbuf->sb_nextnum = nextnum; | |
92 | segbuf->sb_sum.next = nilfs_get_segment_start_blocknr(nilfs, nextnum); | |
93 | } | |
94 | ||
95 | int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *segbuf) | |
96 | { | |
97 | struct buffer_head *bh; | |
98 | ||
99 | bh = sb_getblk(segbuf->sb_super, | |
100 | segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk); | |
101 | if (unlikely(!bh)) | |
102 | return -ENOMEM; | |
103 | ||
104 | nilfs_segbuf_add_segsum_buffer(segbuf, bh); | |
105 | return 0; | |
106 | } | |
107 | ||
108 | int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *segbuf, | |
109 | struct buffer_head **bhp) | |
110 | { | |
111 | struct buffer_head *bh; | |
112 | ||
113 | bh = sb_getblk(segbuf->sb_super, | |
114 | segbuf->sb_pseg_start + segbuf->sb_sum.nblocks); | |
115 | if (unlikely(!bh)) | |
116 | return -ENOMEM; | |
117 | ||
118 | nilfs_segbuf_add_payload_buffer(segbuf, bh); | |
119 | *bhp = bh; | |
120 | return 0; | |
121 | } | |
122 | ||
0c6c44cb | 123 | int nilfs_segbuf_reset(struct nilfs_segment_buffer *segbuf, unsigned int flags, |
fb04b91b | 124 | time64_t ctime, __u64 cno) |
64b5a32e RK |
125 | { |
126 | int err; | |
127 | ||
128 | segbuf->sb_sum.nblocks = segbuf->sb_sum.nsumblk = 0; | |
129 | err = nilfs_segbuf_extend_segsum(segbuf); | |
130 | if (unlikely(err)) | |
131 | return err; | |
132 | ||
133 | segbuf->sb_sum.flags = flags; | |
134 | segbuf->sb_sum.sumbytes = sizeof(struct nilfs_segment_summary); | |
135 | segbuf->sb_sum.nfinfo = segbuf->sb_sum.nfileblk = 0; | |
136 | segbuf->sb_sum.ctime = ctime; | |
50614bcf | 137 | segbuf->sb_sum.cno = cno; |
64b5a32e RK |
138 | return 0; |
139 | } | |
140 | ||
141 | /* | |
7a65004b | 142 | * Setup segment summary |
64b5a32e RK |
143 | */ |
144 | void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *segbuf) | |
145 | { | |
146 | struct nilfs_segment_summary *raw_sum; | |
147 | struct buffer_head *bh_sum; | |
148 | ||
149 | bh_sum = list_entry(segbuf->sb_segsum_buffers.next, | |
150 | struct buffer_head, b_assoc_buffers); | |
151 | raw_sum = (struct nilfs_segment_summary *)bh_sum->b_data; | |
152 | ||
153 | raw_sum->ss_magic = cpu_to_le32(NILFS_SEGSUM_MAGIC); | |
154 | raw_sum->ss_bytes = cpu_to_le16(sizeof(*raw_sum)); | |
155 | raw_sum->ss_flags = cpu_to_le16(segbuf->sb_sum.flags); | |
156 | raw_sum->ss_seq = cpu_to_le64(segbuf->sb_sum.seg_seq); | |
157 | raw_sum->ss_create = cpu_to_le64(segbuf->sb_sum.ctime); | |
158 | raw_sum->ss_next = cpu_to_le64(segbuf->sb_sum.next); | |
159 | raw_sum->ss_nblocks = cpu_to_le32(segbuf->sb_sum.nblocks); | |
160 | raw_sum->ss_nfinfo = cpu_to_le32(segbuf->sb_sum.nfinfo); | |
161 | raw_sum->ss_sumbytes = cpu_to_le32(segbuf->sb_sum.sumbytes); | |
162 | raw_sum->ss_pad = 0; | |
50614bcf | 163 | raw_sum->ss_cno = cpu_to_le64(segbuf->sb_sum.cno); |
64b5a32e RK |
164 | } |
165 | ||
166 | /* | |
167 | * CRC calculation routines | |
168 | */ | |
aaed1d5b RK |
169 | static void |
170 | nilfs_segbuf_fill_in_segsum_crc(struct nilfs_segment_buffer *segbuf, u32 seed) | |
64b5a32e RK |
171 | { |
172 | struct buffer_head *bh; | |
173 | struct nilfs_segment_summary *raw_sum; | |
174 | unsigned long size, bytes = segbuf->sb_sum.sumbytes; | |
175 | u32 crc; | |
176 | ||
177 | bh = list_entry(segbuf->sb_segsum_buffers.next, struct buffer_head, | |
178 | b_assoc_buffers); | |
179 | ||
180 | raw_sum = (struct nilfs_segment_summary *)bh->b_data; | |
181 | size = min_t(unsigned long, bytes, bh->b_size); | |
182 | crc = crc32_le(seed, | |
183 | (unsigned char *)raw_sum + | |
184 | sizeof(raw_sum->ss_datasum) + sizeof(raw_sum->ss_sumsum), | |
185 | size - (sizeof(raw_sum->ss_datasum) + | |
186 | sizeof(raw_sum->ss_sumsum))); | |
187 | ||
188 | list_for_each_entry_continue(bh, &segbuf->sb_segsum_buffers, | |
189 | b_assoc_buffers) { | |
190 | bytes -= size; | |
191 | size = min_t(unsigned long, bytes, bh->b_size); | |
192 | crc = crc32_le(crc, bh->b_data, size); | |
193 | } | |
194 | raw_sum->ss_sumsum = cpu_to_le32(crc); | |
195 | } | |
196 | ||
aaed1d5b RK |
197 | static void nilfs_segbuf_fill_in_data_crc(struct nilfs_segment_buffer *segbuf, |
198 | u32 seed) | |
64b5a32e RK |
199 | { |
200 | struct buffer_head *bh; | |
201 | struct nilfs_segment_summary *raw_sum; | |
202 | void *kaddr; | |
203 | u32 crc; | |
204 | ||
205 | bh = list_entry(segbuf->sb_segsum_buffers.next, struct buffer_head, | |
206 | b_assoc_buffers); | |
207 | raw_sum = (struct nilfs_segment_summary *)bh->b_data; | |
208 | crc = crc32_le(seed, | |
209 | (unsigned char *)raw_sum + sizeof(raw_sum->ss_datasum), | |
210 | bh->b_size - sizeof(raw_sum->ss_datasum)); | |
211 | ||
212 | list_for_each_entry_continue(bh, &segbuf->sb_segsum_buffers, | |
213 | b_assoc_buffers) { | |
214 | crc = crc32_le(crc, bh->b_data, bh->b_size); | |
215 | } | |
216 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) { | |
7b9c0976 | 217 | kaddr = kmap_atomic(bh->b_page); |
64b5a32e | 218 | crc = crc32_le(crc, kaddr + bh_offset(bh), bh->b_size); |
7b9c0976 | 219 | kunmap_atomic(kaddr); |
64b5a32e RK |
220 | } |
221 | raw_sum->ss_datasum = cpu_to_le32(crc); | |
222 | } | |
223 | ||
aaed1d5b RK |
224 | static void |
225 | nilfs_segbuf_fill_in_super_root_crc(struct nilfs_segment_buffer *segbuf, | |
226 | u32 seed) | |
227 | { | |
228 | struct nilfs_super_root *raw_sr; | |
6c6de1aa | 229 | struct the_nilfs *nilfs = segbuf->sb_super->s_fs_info; |
0c6c44cb | 230 | unsigned int srsize; |
aaed1d5b RK |
231 | u32 crc; |
232 | ||
233 | raw_sr = (struct nilfs_super_root *)segbuf->sb_super_root->b_data; | |
6c6de1aa | 234 | srsize = NILFS_SR_BYTES(nilfs->ns_inode_size); |
aaed1d5b RK |
235 | crc = crc32_le(seed, |
236 | (unsigned char *)raw_sr + sizeof(raw_sr->sr_sum), | |
6c6de1aa | 237 | srsize - sizeof(raw_sr->sr_sum)); |
aaed1d5b RK |
238 | raw_sr->sr_sum = cpu_to_le32(crc); |
239 | } | |
240 | ||
e29df395 | 241 | static void nilfs_release_buffers(struct list_head *list) |
64b5a32e RK |
242 | { |
243 | struct buffer_head *bh, *n; | |
244 | ||
245 | list_for_each_entry_safe(bh, n, list, b_assoc_buffers) { | |
246 | list_del_init(&bh->b_assoc_buffers); | |
64b5a32e RK |
247 | brelse(bh); |
248 | } | |
249 | } | |
250 | ||
e29df395 RK |
251 | static void nilfs_segbuf_clear(struct nilfs_segment_buffer *segbuf) |
252 | { | |
253 | nilfs_release_buffers(&segbuf->sb_segsum_buffers); | |
254 | nilfs_release_buffers(&segbuf->sb_payload_buffers); | |
1e2b68bf | 255 | segbuf->sb_super_root = NULL; |
e29df395 RK |
256 | } |
257 | ||
258 | /* | |
259 | * Iterators for segment buffers | |
260 | */ | |
261 | void nilfs_clear_logs(struct list_head *logs) | |
262 | { | |
263 | struct nilfs_segment_buffer *segbuf; | |
264 | ||
265 | list_for_each_entry(segbuf, logs, sb_list) | |
266 | nilfs_segbuf_clear(segbuf); | |
267 | } | |
268 | ||
269 | void nilfs_truncate_logs(struct list_head *logs, | |
270 | struct nilfs_segment_buffer *last) | |
271 | { | |
272 | struct nilfs_segment_buffer *n, *segbuf; | |
273 | ||
274 | segbuf = list_prepare_entry(last, logs, sb_list); | |
275 | list_for_each_entry_safe_continue(segbuf, n, logs, sb_list) { | |
276 | list_del_init(&segbuf->sb_list); | |
277 | nilfs_segbuf_clear(segbuf); | |
278 | nilfs_segbuf_free(segbuf); | |
279 | } | |
280 | } | |
281 | ||
d1c6b72a RK |
282 | int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs) |
283 | { | |
284 | struct nilfs_segment_buffer *segbuf; | |
285 | int ret = 0; | |
286 | ||
287 | list_for_each_entry(segbuf, logs, sb_list) { | |
288 | ret = nilfs_segbuf_write(segbuf, nilfs); | |
289 | if (ret) | |
290 | break; | |
291 | } | |
292 | return ret; | |
293 | } | |
294 | ||
e29df395 RK |
295 | int nilfs_wait_on_logs(struct list_head *logs) |
296 | { | |
297 | struct nilfs_segment_buffer *segbuf; | |
d067633b | 298 | int err, ret = 0; |
e29df395 RK |
299 | |
300 | list_for_each_entry(segbuf, logs, sb_list) { | |
301 | err = nilfs_segbuf_wait(segbuf); | |
d067633b RK |
302 | if (err && !ret) |
303 | ret = err; | |
e29df395 | 304 | } |
d067633b | 305 | return ret; |
e29df395 RK |
306 | } |
307 | ||
aaed1d5b RK |
308 | /** |
309 | * nilfs_add_checksums_on_logs - add checksums on the logs | |
310 | * @logs: list of segment buffers storing target logs | |
311 | * @seed: checksum seed value | |
312 | */ | |
313 | void nilfs_add_checksums_on_logs(struct list_head *logs, u32 seed) | |
314 | { | |
315 | struct nilfs_segment_buffer *segbuf; | |
316 | ||
317 | list_for_each_entry(segbuf, logs, sb_list) { | |
318 | if (segbuf->sb_super_root) | |
319 | nilfs_segbuf_fill_in_super_root_crc(segbuf, seed); | |
320 | nilfs_segbuf_fill_in_segsum_crc(segbuf, seed); | |
321 | nilfs_segbuf_fill_in_data_crc(segbuf, seed); | |
322 | } | |
323 | } | |
324 | ||
64b5a32e RK |
325 | /* |
326 | * BIO operations | |
327 | */ | |
4246a0b6 | 328 | static void nilfs_end_bio_write(struct bio *bio) |
64b5a32e | 329 | { |
9284ad2a | 330 | struct nilfs_segment_buffer *segbuf = bio->bi_private; |
64b5a32e | 331 | |
4e4cbee9 | 332 | if (bio->bi_status) |
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 | 339 | static int nilfs_segbuf_submit_bio(struct nilfs_segment_buffer *segbuf, |
fbe7c2ef | 340 | struct nilfs_write_info *wi) |
64b5a32e RK |
341 | { |
342 | struct bio *bio = wi->bio; | |
64b5a32e RK |
343 | |
344 | bio->bi_end_io = nilfs_end_bio_write; | |
9284ad2a | 345 | bio->bi_private = segbuf; |
4e49ea4a | 346 | submit_bio(bio); |
4bf93b50 | 347 | segbuf->sb_nbio++; |
64b5a32e RK |
348 | |
349 | wi->bio = NULL; | |
350 | wi->rest_blocks -= wi->end - wi->start; | |
351 | wi->nr_vecs = min(wi->max_pages, wi->rest_blocks); | |
352 | wi->start = wi->end; | |
353 | return 0; | |
64b5a32e RK |
354 | } |
355 | ||
9c965bac RK |
356 | static void nilfs_segbuf_prepare_write(struct nilfs_segment_buffer *segbuf, |
357 | struct nilfs_write_info *wi) | |
64b5a32e RK |
358 | { |
359 | wi->bio = NULL; | |
360 | wi->rest_blocks = segbuf->sb_sum.nblocks; | |
a8affc03 | 361 | wi->max_pages = BIO_MAX_VECS; |
64b5a32e RK |
362 | wi->nr_vecs = min(wi->max_pages, wi->rest_blocks); |
363 | wi->start = wi->end = 0; | |
64b5a32e | 364 | wi->blocknr = segbuf->sb_pseg_start; |
64b5a32e RK |
365 | } |
366 | ||
9284ad2a RK |
367 | static int nilfs_segbuf_submit_bh(struct nilfs_segment_buffer *segbuf, |
368 | struct nilfs_write_info *wi, | |
fbe7c2ef | 369 | struct buffer_head *bh) |
64b5a32e RK |
370 | { |
371 | int len, err; | |
372 | ||
373 | BUG_ON(wi->nr_vecs <= 0); | |
374 | repeat: | |
375 | if (!wi->bio) { | |
fbe7c2ef CH |
376 | wi->bio = bio_alloc(wi->nilfs->ns_bdev, wi->nr_vecs, |
377 | REQ_OP_WRITE, GFP_NOIO); | |
f0d91192 CH |
378 | wi->bio->bi_iter.bi_sector = (wi->blocknr + wi->end) << |
379 | (wi->nilfs->ns_blocksize_bits - 9); | |
64b5a32e RK |
380 | } |
381 | ||
382 | len = bio_add_page(wi->bio, bh->b_page, bh->b_size, bh_offset(bh)); | |
383 | if (len == bh->b_size) { | |
384 | wi->end++; | |
385 | return 0; | |
386 | } | |
387 | /* bio is FULL */ | |
fbe7c2ef | 388 | err = nilfs_segbuf_submit_bio(segbuf, wi); |
64b5a32e RK |
389 | /* never submit current bh */ |
390 | if (likely(!err)) | |
391 | goto repeat; | |
392 | return err; | |
393 | } | |
394 | ||
9c965bac RK |
395 | /** |
396 | * nilfs_segbuf_write - submit write requests of a log | |
397 | * @segbuf: buffer storing a log to be written | |
398 | * @nilfs: nilfs object | |
399 | * | |
400 | * Return Value: On Success, 0 is returned. On Error, one of the following | |
401 | * negative error code is returned. | |
402 | * | |
403 | * %-EIO - I/O error | |
404 | * | |
405 | * %-ENOMEM - Insufficient memory available. | |
406 | */ | |
6c477d44 RK |
407 | static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf, |
408 | struct the_nilfs *nilfs) | |
64b5a32e | 409 | { |
9c965bac | 410 | struct nilfs_write_info wi; |
64b5a32e | 411 | struct buffer_head *bh; |
b2d45866 | 412 | int res = 0; |
64b5a32e | 413 | |
9c965bac RK |
414 | wi.nilfs = nilfs; |
415 | nilfs_segbuf_prepare_write(segbuf, &wi); | |
416 | ||
64b5a32e | 417 | list_for_each_entry(bh, &segbuf->sb_segsum_buffers, b_assoc_buffers) { |
fbe7c2ef | 418 | res = nilfs_segbuf_submit_bh(segbuf, &wi, bh); |
64b5a32e RK |
419 | if (unlikely(res)) |
420 | goto failed_bio; | |
421 | } | |
422 | ||
423 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) { | |
fbe7c2ef | 424 | res = nilfs_segbuf_submit_bh(segbuf, &wi, bh); |
64b5a32e RK |
425 | if (unlikely(res)) |
426 | goto failed_bio; | |
427 | } | |
428 | ||
9c965bac | 429 | if (wi.bio) { |
64b5a32e RK |
430 | /* |
431 | * Last BIO is always sent through the following | |
432 | * submission. | |
433 | */ | |
fbe7c2ef CH |
434 | wi.bio->bi_opf |= REQ_SYNC; |
435 | res = nilfs_segbuf_submit_bio(segbuf, &wi); | |
64b5a32e RK |
436 | } |
437 | ||
64b5a32e | 438 | failed_bio: |
5f1586d0 | 439 | return res; |
64b5a32e RK |
440 | } |
441 | ||
442 | /** | |
443 | * nilfs_segbuf_wait - wait for completion of requested BIOs | |
9284ad2a | 444 | * @segbuf: segment buffer |
64b5a32e RK |
445 | * |
446 | * Return Value: On Success, 0 is returned. On Error, one of the following | |
447 | * negative error code is returned. | |
448 | * | |
449 | * %-EIO - I/O error | |
450 | */ | |
6c477d44 | 451 | static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf) |
64b5a32e RK |
452 | { |
453 | int err = 0; | |
454 | ||
9284ad2a | 455 | if (!segbuf->sb_nbio) |
64b5a32e RK |
456 | return 0; |
457 | ||
458 | do { | |
9284ad2a RK |
459 | wait_for_completion(&segbuf->sb_bio_event); |
460 | } while (--segbuf->sb_nbio > 0); | |
64b5a32e | 461 | |
9284ad2a | 462 | if (unlikely(atomic_read(&segbuf->sb_err) > 0)) { |
a1d0747a | 463 | nilfs_err(segbuf->sb_super, |
feee880f RK |
464 | "I/O error writing log (start-blocknr=%llu, block-count=%lu) in segment %llu", |
465 | (unsigned long long)segbuf->sb_pseg_start, | |
466 | segbuf->sb_sum.nblocks, | |
467 | (unsigned long long)segbuf->sb_segnum); | |
64b5a32e | 468 | err = -EIO; |
64b5a32e RK |
469 | } |
470 | return err; | |
471 | } |