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26#include <linux/fs.h>
27#include <linux/types.h>
28#include <linux/highmem.h>
29
30#include <cluster/masklog.h>
31
32#include "ocfs2.h"
33
34#include "alloc.h"
35#include "inode.h"
36#include "journal.h"
37#include "uptodate.h"
38#include "buffer_head_io.h"
39#include "ocfs2_trace.h"
40
41
42
43
44
45
46enum ocfs2_state_bits {
47 BH_NeedsValidate = BH_JBDPrivateStart,
48};
49
50
51BUFFER_FNS(NeedsValidate, needs_validate);
52
53int ocfs2_write_block(struct ocfs2_super *osb, struct buffer_head *bh,
54 struct ocfs2_caching_info *ci)
55{
56 int ret = 0;
57
58 trace_ocfs2_write_block((unsigned long long)bh->b_blocknr, ci);
59
60 BUG_ON(bh->b_blocknr < OCFS2_SUPER_BLOCK_BLKNO);
61 BUG_ON(buffer_jbd(bh));
62
63
64
65
66 if (ocfs2_is_hard_readonly(osb)) {
67 ret = -EROFS;
68 mlog_errno(ret);
69 goto out;
70 }
71
72 ocfs2_metadata_cache_io_lock(ci);
73
74 lock_buffer(bh);
75 set_buffer_uptodate(bh);
76
77
78 clear_buffer_dirty(bh);
79
80 get_bh(bh);
81 bh->b_end_io = end_buffer_write_sync;
82 submit_bh(WRITE, bh);
83
84 wait_on_buffer(bh);
85
86 if (buffer_uptodate(bh)) {
87 ocfs2_set_buffer_uptodate(ci, bh);
88 } else {
89
90
91
92 ret = -EIO;
93 mlog_errno(ret);
94 }
95
96 ocfs2_metadata_cache_io_unlock(ci);
97out:
98 return ret;
99}
100
101int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
102 unsigned int nr, struct buffer_head *bhs[])
103{
104 int status = 0;
105 unsigned int i;
106 struct buffer_head *bh;
107
108 trace_ocfs2_read_blocks_sync((unsigned long long)block, nr);
109
110 if (!nr)
111 goto bail;
112
113 for (i = 0 ; i < nr ; i++) {
114 if (bhs[i] == NULL) {
115 bhs[i] = sb_getblk(osb->sb, block++);
116 if (bhs[i] == NULL) {
117 status = -ENOMEM;
118 mlog_errno(status);
119 goto bail;
120 }
121 }
122 bh = bhs[i];
123
124 if (buffer_jbd(bh)) {
125 trace_ocfs2_read_blocks_sync_jbd(
126 (unsigned long long)bh->b_blocknr);
127 continue;
128 }
129
130 if (buffer_dirty(bh)) {
131
132
133 mlog(ML_ERROR,
134 "trying to sync read a dirty "
135 "buffer! (blocknr = %llu), skipping\n",
136 (unsigned long long)bh->b_blocknr);
137 continue;
138 }
139
140 lock_buffer(bh);
141 if (buffer_jbd(bh)) {
142 mlog(ML_ERROR,
143 "block %llu had the JBD bit set "
144 "while I was in lock_buffer!",
145 (unsigned long long)bh->b_blocknr);
146 BUG();
147 }
148
149 clear_buffer_uptodate(bh);
150 get_bh(bh);
151 bh->b_end_io = end_buffer_read_sync;
152 submit_bh(READ, bh);
153 }
154
155 for (i = nr; i > 0; i--) {
156 bh = bhs[i - 1];
157
158
159 if (!buffer_jbd(bh))
160 wait_on_buffer(bh);
161
162 if (!buffer_uptodate(bh)) {
163
164
165
166 status = -EIO;
167 put_bh(bh);
168 bhs[i - 1] = NULL;
169 }
170 }
171
172bail:
173 return status;
174}
175
176int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr,
177 struct buffer_head *bhs[], int flags,
178 int (*validate)(struct super_block *sb,
179 struct buffer_head *bh))
180{
181 int status = 0;
182 int i, ignore_cache = 0;
183 struct buffer_head *bh;
184 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
185
186 trace_ocfs2_read_blocks_begin(ci, (unsigned long long)block, nr, flags);
187
188 BUG_ON(!ci);
189 BUG_ON((flags & OCFS2_BH_READAHEAD) &&
190 (flags & OCFS2_BH_IGNORE_CACHE));
191
192 if (bhs == NULL) {
193 status = -EINVAL;
194 mlog_errno(status);
195 goto bail;
196 }
197
198 if (nr < 0) {
199 mlog(ML_ERROR, "asked to read %d blocks!\n", nr);
200 status = -EINVAL;
201 mlog_errno(status);
202 goto bail;
203 }
204
205 if (nr == 0) {
206 status = 0;
207 goto bail;
208 }
209
210 ocfs2_metadata_cache_io_lock(ci);
211 for (i = 0 ; i < nr ; i++) {
212 if (bhs[i] == NULL) {
213 bhs[i] = sb_getblk(sb, block++);
214 if (bhs[i] == NULL) {
215 ocfs2_metadata_cache_io_unlock(ci);
216 status = -ENOMEM;
217 mlog_errno(status);
218 goto bail;
219 }
220 }
221 bh = bhs[i];
222 ignore_cache = (flags & OCFS2_BH_IGNORE_CACHE);
223
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248 if (!ignore_cache && !ocfs2_buffer_uptodate(ci, bh)) {
249 trace_ocfs2_read_blocks_from_disk(
250 (unsigned long long)bh->b_blocknr,
251 (unsigned long long)ocfs2_metadata_cache_owner(ci));
252
253
254 ignore_cache = 1;
255 }
256
257 trace_ocfs2_read_blocks_bh((unsigned long long)bh->b_blocknr,
258 ignore_cache, buffer_jbd(bh), buffer_dirty(bh));
259
260 if (buffer_jbd(bh)) {
261 continue;
262 }
263
264 if (ignore_cache) {
265 if (buffer_dirty(bh)) {
266
267
268 continue;
269 }
270
271
272
273
274
275 if ((flags & OCFS2_BH_READAHEAD)
276 && ocfs2_buffer_read_ahead(ci, bh))
277 continue;
278
279 lock_buffer(bh);
280 if (buffer_jbd(bh)) {
281#ifdef CATCH_BH_JBD_RACES
282 mlog(ML_ERROR, "block %llu had the JBD bit set "
283 "while I was in lock_buffer!",
284 (unsigned long long)bh->b_blocknr);
285 BUG();
286#else
287 unlock_buffer(bh);
288 continue;
289#endif
290 }
291
292
293
294
295
296 if (!(flags & OCFS2_BH_IGNORE_CACHE)
297 && !(flags & OCFS2_BH_READAHEAD)
298 && ocfs2_buffer_uptodate(ci, bh)) {
299 unlock_buffer(bh);
300 continue;
301 }
302
303 clear_buffer_uptodate(bh);
304 get_bh(bh);
305 if (validate)
306 set_buffer_needs_validate(bh);
307 bh->b_end_io = end_buffer_read_sync;
308 submit_bh(READ, bh);
309 continue;
310 }
311 }
312
313 status = 0;
314
315 for (i = (nr - 1); i >= 0; i--) {
316 bh = bhs[i];
317
318 if (!(flags & OCFS2_BH_READAHEAD)) {
319
320
321
322 if (!buffer_jbd(bh))
323 wait_on_buffer(bh);
324
325 if (!buffer_uptodate(bh)) {
326
327
328
329
330
331
332 status = -EIO;
333 put_bh(bh);
334 bhs[i] = NULL;
335 continue;
336 }
337
338 if (buffer_needs_validate(bh)) {
339
340
341
342 BUG_ON(buffer_jbd(bh));
343 clear_buffer_needs_validate(bh);
344 status = validate(sb, bh);
345 if (status) {
346 put_bh(bh);
347 bhs[i] = NULL;
348 continue;
349 }
350 }
351 }
352
353
354
355
356 ocfs2_set_buffer_uptodate(ci, bh);
357 }
358 ocfs2_metadata_cache_io_unlock(ci);
359
360 trace_ocfs2_read_blocks_end((unsigned long long)block, nr,
361 flags, ignore_cache);
362
363bail:
364
365 return status;
366}
367
368
369static void ocfs2_check_super_or_backup(struct super_block *sb,
370 sector_t blkno)
371{
372 int i;
373 u64 backup_blkno;
374
375 if (blkno == OCFS2_SUPER_BLOCK_BLKNO)
376 return;
377
378 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
379 backup_blkno = ocfs2_backup_super_blkno(sb, i);
380 if (backup_blkno == blkno)
381 return;
382 }
383
384 BUG();
385}
386
387
388
389
390
391
392int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
393 struct buffer_head *bh)
394{
395 int ret = 0;
396 struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
397
398 BUG_ON(buffer_jbd(bh));
399 ocfs2_check_super_or_backup(osb->sb, bh->b_blocknr);
400
401 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) {
402 ret = -EROFS;
403 mlog_errno(ret);
404 goto out;
405 }
406
407 lock_buffer(bh);
408 set_buffer_uptodate(bh);
409
410
411 clear_buffer_dirty(bh);
412
413 get_bh(bh);
414 bh->b_end_io = end_buffer_write_sync;
415 ocfs2_compute_meta_ecc(osb->sb, bh->b_data, &di->i_check);
416 submit_bh(WRITE, bh);
417
418 wait_on_buffer(bh);
419
420 if (!buffer_uptodate(bh)) {
421 ret = -EIO;
422 mlog_errno(ret);
423 }
424
425out:
426 return ret;
427}
428