Commit | Line | Data |
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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
4 | * |
5 | * This copyrighted material is made available to anyone wishing to use, | |
6 | * modify, copy, or redistribute it subject to the terms and conditions | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
8 | */ |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/completion.h> | |
14 | #include <linux/buffer_head.h> | |
5c676f6d | 15 | #include <linux/gfs2_ondisk.h> |
71b86f56 | 16 | #include <linux/crc32.h> |
7d308590 | 17 | #include <linux/lm_interface.h> |
a25311c8 | 18 | #include <linux/delay.h> |
b3b94faa DT |
19 | |
20 | #include "gfs2.h" | |
5c676f6d | 21 | #include "incore.h" |
b3b94faa DT |
22 | #include "bmap.h" |
23 | #include "glock.h" | |
24 | #include "log.h" | |
25 | #include "lops.h" | |
26 | #include "meta_io.h" | |
5c676f6d | 27 | #include "util.h" |
71b86f56 | 28 | #include "dir.h" |
b3b94faa DT |
29 | |
30 | #define PULL 1 | |
31 | ||
b3b94faa DT |
32 | /** |
33 | * gfs2_struct2blk - compute stuff | |
34 | * @sdp: the filesystem | |
35 | * @nstruct: the number of structures | |
36 | * @ssize: the size of the structures | |
37 | * | |
38 | * Compute the number of log descriptor blocks needed to hold a certain number | |
39 | * of structures of a certain size. | |
40 | * | |
41 | * Returns: the number of blocks needed (minimum is always 1) | |
42 | */ | |
43 | ||
44 | unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct, | |
45 | unsigned int ssize) | |
46 | { | |
47 | unsigned int blks; | |
48 | unsigned int first, second; | |
49 | ||
50 | blks = 1; | |
faa31ce8 | 51 | first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / ssize; |
b3b94faa DT |
52 | |
53 | if (nstruct > first) { | |
568f4c96 SW |
54 | second = (sdp->sd_sb.sb_bsize - |
55 | sizeof(struct gfs2_meta_header)) / ssize; | |
5c676f6d | 56 | blks += DIV_ROUND_UP(nstruct - first, second); |
b3b94faa DT |
57 | } |
58 | ||
59 | return blks; | |
60 | } | |
61 | ||
ddacfaf7 SW |
62 | /** |
63 | * gfs2_ail1_start_one - Start I/O on a part of the AIL | |
64 | * @sdp: the filesystem | |
65 | * @tr: the part of the AIL | |
66 | * | |
67 | */ | |
68 | ||
69 | static void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) | |
70 | { | |
71 | struct gfs2_bufdata *bd, *s; | |
72 | struct buffer_head *bh; | |
73 | int retry; | |
74 | ||
75 | BUG_ON(!spin_is_locked(&sdp->sd_log_lock)); | |
76 | ||
77 | do { | |
78 | retry = 0; | |
79 | ||
80 | list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, | |
81 | bd_ail_st_list) { | |
82 | bh = bd->bd_bh; | |
83 | ||
84 | gfs2_assert(sdp, bd->bd_ail == ai); | |
85 | ||
86 | if (!buffer_busy(bh)) { | |
87 | if (!buffer_uptodate(bh)) { | |
88 | gfs2_log_unlock(sdp); | |
89 | gfs2_io_error_bh(sdp, bh); | |
90 | gfs2_log_lock(sdp); | |
91 | } | |
92 | list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); | |
93 | continue; | |
94 | } | |
95 | ||
96 | if (!buffer_dirty(bh)) | |
97 | continue; | |
98 | ||
99 | list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list); | |
100 | ||
101 | gfs2_log_unlock(sdp); | |
102 | wait_on_buffer(bh); | |
103 | ll_rw_block(WRITE, 1, &bh); | |
104 | gfs2_log_lock(sdp); | |
105 | ||
106 | retry = 1; | |
107 | break; | |
108 | } | |
109 | } while (retry); | |
110 | } | |
111 | ||
112 | /** | |
113 | * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced | |
114 | * @sdp: the filesystem | |
115 | * @ai: the AIL entry | |
116 | * | |
117 | */ | |
118 | ||
119 | static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags) | |
120 | { | |
121 | struct gfs2_bufdata *bd, *s; | |
122 | struct buffer_head *bh; | |
123 | ||
124 | list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, | |
125 | bd_ail_st_list) { | |
126 | bh = bd->bd_bh; | |
127 | ||
128 | gfs2_assert(sdp, bd->bd_ail == ai); | |
129 | ||
130 | if (buffer_busy(bh)) { | |
131 | if (flags & DIO_ALL) | |
132 | continue; | |
133 | else | |
134 | break; | |
135 | } | |
136 | ||
137 | if (!buffer_uptodate(bh)) | |
138 | gfs2_io_error_bh(sdp, bh); | |
139 | ||
140 | list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); | |
141 | } | |
142 | ||
143 | return list_empty(&ai->ai_ail1_list); | |
144 | } | |
145 | ||
a25311c8 | 146 | static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags) |
b3b94faa DT |
147 | { |
148 | struct list_head *head = &sdp->sd_ail1_list; | |
cd915493 | 149 | u64 sync_gen; |
74669416 SW |
150 | struct list_head *first; |
151 | struct gfs2_ail *first_ai, *ai, *tmp; | |
152 | int done = 0; | |
b3b94faa DT |
153 | |
154 | gfs2_log_lock(sdp); | |
155 | if (list_empty(head)) { | |
156 | gfs2_log_unlock(sdp); | |
157 | return; | |
158 | } | |
159 | sync_gen = sdp->sd_ail_sync_gen++; | |
160 | ||
161 | first = head->prev; | |
162 | first_ai = list_entry(first, struct gfs2_ail, ai_list); | |
163 | first_ai->ai_sync_gen = sync_gen; | |
74669416 | 164 | gfs2_ail1_start_one(sdp, first_ai); /* This may drop log lock */ |
b3b94faa DT |
165 | |
166 | if (flags & DIO_ALL) | |
167 | first = NULL; | |
168 | ||
74669416 | 169 | while(!done) { |
484adff8 SW |
170 | if (first && (head->prev != first || |
171 | gfs2_ail1_empty_one(sdp, first_ai, 0))) | |
b3b94faa DT |
172 | break; |
173 | ||
74669416 SW |
174 | done = 1; |
175 | list_for_each_entry_safe_reverse(ai, tmp, head, ai_list) { | |
b3b94faa DT |
176 | if (ai->ai_sync_gen >= sync_gen) |
177 | continue; | |
178 | ai->ai_sync_gen = sync_gen; | |
74669416 SW |
179 | gfs2_ail1_start_one(sdp, ai); /* This may drop log lock */ |
180 | done = 0; | |
b3b94faa DT |
181 | break; |
182 | } | |
b3b94faa DT |
183 | } |
184 | ||
185 | gfs2_log_unlock(sdp); | |
186 | } | |
187 | ||
188 | int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags) | |
189 | { | |
190 | struct gfs2_ail *ai, *s; | |
191 | int ret; | |
192 | ||
193 | gfs2_log_lock(sdp); | |
194 | ||
195 | list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) { | |
196 | if (gfs2_ail1_empty_one(sdp, ai, flags)) | |
197 | list_move(&ai->ai_list, &sdp->sd_ail2_list); | |
198 | else if (!(flags & DIO_ALL)) | |
199 | break; | |
200 | } | |
201 | ||
202 | ret = list_empty(&sdp->sd_ail1_list); | |
203 | ||
204 | gfs2_log_unlock(sdp); | |
205 | ||
206 | return ret; | |
207 | } | |
208 | ||
ddacfaf7 SW |
209 | |
210 | /** | |
211 | * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced | |
212 | * @sdp: the filesystem | |
213 | * @ai: the AIL entry | |
214 | * | |
215 | */ | |
216 | ||
217 | static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) | |
218 | { | |
219 | struct list_head *head = &ai->ai_ail2_list; | |
220 | struct gfs2_bufdata *bd; | |
221 | ||
222 | while (!list_empty(head)) { | |
223 | bd = list_entry(head->prev, struct gfs2_bufdata, | |
224 | bd_ail_st_list); | |
225 | gfs2_assert(sdp, bd->bd_ail == ai); | |
226 | bd->bd_ail = NULL; | |
227 | list_del(&bd->bd_ail_st_list); | |
228 | list_del(&bd->bd_ail_gl_list); | |
229 | atomic_dec(&bd->bd_gl->gl_ail_count); | |
230 | brelse(bd->bd_bh); | |
231 | } | |
232 | } | |
233 | ||
b3b94faa DT |
234 | static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail) |
235 | { | |
236 | struct gfs2_ail *ai, *safe; | |
237 | unsigned int old_tail = sdp->sd_log_tail; | |
238 | int wrap = (new_tail < old_tail); | |
239 | int a, b, rm; | |
240 | ||
241 | gfs2_log_lock(sdp); | |
242 | ||
243 | list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) { | |
244 | a = (old_tail <= ai->ai_first); | |
245 | b = (ai->ai_first < new_tail); | |
246 | rm = (wrap) ? (a || b) : (a && b); | |
247 | if (!rm) | |
248 | continue; | |
249 | ||
250 | gfs2_ail2_empty_one(sdp, ai); | |
251 | list_del(&ai->ai_list); | |
252 | gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list)); | |
253 | gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list)); | |
254 | kfree(ai); | |
255 | } | |
256 | ||
257 | gfs2_log_unlock(sdp); | |
258 | } | |
259 | ||
260 | /** | |
261 | * gfs2_log_reserve - Make a log reservation | |
262 | * @sdp: The GFS2 superblock | |
263 | * @blks: The number of blocks to reserve | |
264 | * | |
b004157a SW |
265 | * Note that we never give out the last 6 blocks of the journal. Thats |
266 | * due to the fact that there is are a small number of header blocks | |
267 | * associated with each log flush. The exact number can't be known until | |
268 | * flush time, so we ensure that we have just enough free blocks at all | |
269 | * times to avoid running out during a log flush. | |
270 | * | |
b3b94faa DT |
271 | * Returns: errno |
272 | */ | |
273 | ||
274 | int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks) | |
275 | { | |
b3b94faa DT |
276 | unsigned int try = 0; |
277 | ||
278 | if (gfs2_assert_warn(sdp, blks) || | |
279 | gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks)) | |
280 | return -EINVAL; | |
281 | ||
71b86f56 | 282 | mutex_lock(&sdp->sd_log_reserve_mutex); |
484adff8 | 283 | gfs2_log_lock(sdp); |
b004157a | 284 | while(sdp->sd_log_blks_free <= (blks + 6)) { |
b3b94faa | 285 | gfs2_log_unlock(sdp); |
b3b94faa | 286 | gfs2_ail1_empty(sdp, 0); |
b09e593d | 287 | gfs2_log_flush(sdp, NULL); |
b3b94faa DT |
288 | |
289 | if (try++) | |
290 | gfs2_ail1_start(sdp, 0); | |
484adff8 | 291 | gfs2_log_lock(sdp); |
b3b94faa | 292 | } |
484adff8 SW |
293 | sdp->sd_log_blks_free -= blks; |
294 | gfs2_log_unlock(sdp); | |
295 | mutex_unlock(&sdp->sd_log_reserve_mutex); | |
296 | ||
297 | down_read(&sdp->sd_log_flush_lock); | |
b3b94faa DT |
298 | |
299 | return 0; | |
300 | } | |
301 | ||
302 | /** | |
303 | * gfs2_log_release - Release a given number of log blocks | |
304 | * @sdp: The GFS2 superblock | |
305 | * @blks: The number of blocks | |
306 | * | |
307 | */ | |
308 | ||
309 | void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks) | |
310 | { | |
b3b94faa DT |
311 | |
312 | gfs2_log_lock(sdp); | |
313 | sdp->sd_log_blks_free += blks; | |
314 | gfs2_assert_withdraw(sdp, | |
315 | sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); | |
316 | gfs2_log_unlock(sdp); | |
ed386507 | 317 | up_read(&sdp->sd_log_flush_lock); |
b3b94faa DT |
318 | } |
319 | ||
cd915493 | 320 | static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn) |
b3b94faa | 321 | { |
23591256 | 322 | struct inode *inode = sdp->sd_jdesc->jd_inode; |
b3b94faa | 323 | int error; |
23591256 | 324 | struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; |
b3b94faa | 325 | |
23591256 SW |
326 | bh_map.b_size = 1 << inode->i_blkbits; |
327 | error = gfs2_block_map(inode, lbn, 0, &bh_map); | |
7a6bbacb | 328 | if (error || !bh_map.b_blocknr) |
aed3255f RK |
329 | printk(KERN_INFO "error=%d, dbn=%llu lbn=%u", error, |
330 | (unsigned long long)bh_map.b_blocknr, lbn); | |
7a6bbacb | 331 | gfs2_assert_withdraw(sdp, !error && bh_map.b_blocknr); |
b3b94faa | 332 | |
7a6bbacb | 333 | return bh_map.b_blocknr; |
b3b94faa DT |
334 | } |
335 | ||
336 | /** | |
337 | * log_distance - Compute distance between two journal blocks | |
338 | * @sdp: The GFS2 superblock | |
339 | * @newer: The most recent journal block of the pair | |
340 | * @older: The older journal block of the pair | |
341 | * | |
342 | * Compute the distance (in the journal direction) between two | |
343 | * blocks in the journal | |
344 | * | |
345 | * Returns: the distance in blocks | |
346 | */ | |
347 | ||
faa31ce8 | 348 | static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer, |
b3b94faa DT |
349 | unsigned int older) |
350 | { | |
351 | int dist; | |
352 | ||
353 | dist = newer - older; | |
354 | if (dist < 0) | |
355 | dist += sdp->sd_jdesc->jd_blocks; | |
356 | ||
357 | return dist; | |
358 | } | |
359 | ||
360 | static unsigned int current_tail(struct gfs2_sbd *sdp) | |
361 | { | |
362 | struct gfs2_ail *ai; | |
363 | unsigned int tail; | |
364 | ||
365 | gfs2_log_lock(sdp); | |
366 | ||
faa31ce8 | 367 | if (list_empty(&sdp->sd_ail1_list)) { |
b3b94faa | 368 | tail = sdp->sd_log_head; |
faa31ce8 SW |
369 | } else { |
370 | ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail, ai_list); | |
b3b94faa DT |
371 | tail = ai->ai_first; |
372 | } | |
373 | ||
374 | gfs2_log_unlock(sdp); | |
375 | ||
376 | return tail; | |
377 | } | |
378 | ||
379 | static inline void log_incr_head(struct gfs2_sbd *sdp) | |
380 | { | |
381 | if (sdp->sd_log_flush_head == sdp->sd_log_tail) | |
faa31ce8 | 382 | gfs2_assert_withdraw(sdp, sdp->sd_log_flush_head == sdp->sd_log_head); |
b3b94faa DT |
383 | |
384 | if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) { | |
385 | sdp->sd_log_flush_head = 0; | |
386 | sdp->sd_log_flush_wrapped = 1; | |
387 | } | |
388 | } | |
389 | ||
390 | /** | |
391 | * gfs2_log_get_buf - Get and initialize a buffer to use for log control data | |
392 | * @sdp: The GFS2 superblock | |
393 | * | |
394 | * Returns: the buffer_head | |
395 | */ | |
396 | ||
397 | struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp) | |
398 | { | |
cd915493 | 399 | u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); |
b3b94faa DT |
400 | struct gfs2_log_buf *lb; |
401 | struct buffer_head *bh; | |
402 | ||
4f3df041 | 403 | lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
404 | list_add(&lb->lb_list, &sdp->sd_log_flush_list); |
405 | ||
406 | bh = lb->lb_bh = sb_getblk(sdp->sd_vfs, blkno); | |
407 | lock_buffer(bh); | |
408 | memset(bh->b_data, 0, bh->b_size); | |
409 | set_buffer_uptodate(bh); | |
410 | clear_buffer_dirty(bh); | |
411 | unlock_buffer(bh); | |
412 | ||
413 | log_incr_head(sdp); | |
414 | ||
415 | return bh; | |
416 | } | |
417 | ||
418 | /** | |
419 | * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log | |
420 | * @sdp: the filesystem | |
421 | * @data: the data the buffer_head should point to | |
422 | * | |
423 | * Returns: the log buffer descriptor | |
424 | */ | |
425 | ||
426 | struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp, | |
427 | struct buffer_head *real) | |
428 | { | |
cd915493 | 429 | u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); |
b3b94faa DT |
430 | struct gfs2_log_buf *lb; |
431 | struct buffer_head *bh; | |
432 | ||
4f3df041 | 433 | lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
434 | list_add(&lb->lb_list, &sdp->sd_log_flush_list); |
435 | lb->lb_real = real; | |
436 | ||
437 | bh = lb->lb_bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL); | |
438 | atomic_set(&bh->b_count, 1); | |
439 | bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate); | |
18ec7d5c | 440 | set_bh_page(bh, real->b_page, bh_offset(real)); |
b3b94faa DT |
441 | bh->b_blocknr = blkno; |
442 | bh->b_size = sdp->sd_sb.sb_bsize; | |
443 | bh->b_bdev = sdp->sd_vfs->s_bdev; | |
444 | ||
445 | log_incr_head(sdp); | |
446 | ||
447 | return bh; | |
448 | } | |
449 | ||
450 | static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail, int pull) | |
451 | { | |
452 | unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail); | |
453 | ||
454 | ail2_empty(sdp, new_tail); | |
455 | ||
456 | gfs2_log_lock(sdp); | |
c5392124 | 457 | sdp->sd_log_blks_free += dist - (pull ? 1 : 0); |
faa31ce8 | 458 | gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); |
b3b94faa DT |
459 | gfs2_log_unlock(sdp); |
460 | ||
461 | sdp->sd_log_tail = new_tail; | |
462 | } | |
463 | ||
464 | /** | |
465 | * log_write_header - Get and initialize a journal header buffer | |
466 | * @sdp: The GFS2 superblock | |
467 | * | |
468 | * Returns: the initialized log buffer descriptor | |
469 | */ | |
470 | ||
cd915493 | 471 | static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull) |
b3b94faa | 472 | { |
cd915493 | 473 | u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); |
b3b94faa DT |
474 | struct buffer_head *bh; |
475 | struct gfs2_log_header *lh; | |
476 | unsigned int tail; | |
cd915493 | 477 | u32 hash; |
b3b94faa | 478 | |
b3b94faa DT |
479 | bh = sb_getblk(sdp->sd_vfs, blkno); |
480 | lock_buffer(bh); | |
481 | memset(bh->b_data, 0, bh->b_size); | |
482 | set_buffer_uptodate(bh); | |
483 | clear_buffer_dirty(bh); | |
484 | unlock_buffer(bh); | |
485 | ||
486 | gfs2_ail1_empty(sdp, 0); | |
487 | tail = current_tail(sdp); | |
488 | ||
489 | lh = (struct gfs2_log_header *)bh->b_data; | |
490 | memset(lh, 0, sizeof(struct gfs2_log_header)); | |
491 | lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC); | |
e3167ded SW |
492 | lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH); |
493 | lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH); | |
e0f2bf78 SW |
494 | lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++); |
495 | lh->lh_flags = cpu_to_be32(flags); | |
496 | lh->lh_tail = cpu_to_be32(tail); | |
497 | lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head); | |
b3b94faa DT |
498 | hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header)); |
499 | lh->lh_hash = cpu_to_be32(hash); | |
500 | ||
501 | set_buffer_dirty(bh); | |
502 | if (sync_dirty_buffer(bh)) | |
503 | gfs2_io_error_bh(sdp, bh); | |
504 | brelse(bh); | |
505 | ||
506 | if (sdp->sd_log_tail != tail) | |
507 | log_pull_tail(sdp, tail, pull); | |
508 | else | |
509 | gfs2_assert_withdraw(sdp, !pull); | |
510 | ||
511 | sdp->sd_log_idle = (tail == sdp->sd_log_flush_head); | |
512 | log_incr_head(sdp); | |
513 | } | |
514 | ||
515 | static void log_flush_commit(struct gfs2_sbd *sdp) | |
516 | { | |
517 | struct list_head *head = &sdp->sd_log_flush_list; | |
518 | struct gfs2_log_buf *lb; | |
519 | struct buffer_head *bh; | |
b3b94faa DT |
520 | |
521 | while (!list_empty(head)) { | |
522 | lb = list_entry(head->next, struct gfs2_log_buf, lb_list); | |
523 | list_del(&lb->lb_list); | |
524 | bh = lb->lb_bh; | |
525 | ||
526 | wait_on_buffer(bh); | |
527 | if (!buffer_uptodate(bh)) | |
528 | gfs2_io_error_bh(sdp, bh); | |
529 | if (lb->lb_real) { | |
530 | while (atomic_read(&bh->b_count) != 1) /* Grrrr... */ | |
531 | schedule(); | |
532 | free_buffer_head(bh); | |
533 | } else | |
534 | brelse(bh); | |
535 | kfree(lb); | |
536 | } | |
537 | ||
538 | log_write_header(sdp, 0, 0); | |
539 | } | |
540 | ||
541 | /** | |
b09e593d | 542 | * gfs2_log_flush - flush incore transaction(s) |
b3b94faa DT |
543 | * @sdp: the filesystem |
544 | * @gl: The glock structure to flush. If NULL, flush the whole incore log | |
545 | * | |
546 | */ | |
547 | ||
b09e593d | 548 | void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl) |
b3b94faa DT |
549 | { |
550 | struct gfs2_ail *ai; | |
551 | ||
484adff8 | 552 | down_write(&sdp->sd_log_flush_lock); |
f55ab26a SW |
553 | |
554 | if (gl) { | |
555 | gfs2_log_lock(sdp); | |
556 | if (list_empty(&gl->gl_le.le_list)) { | |
557 | gfs2_log_unlock(sdp); | |
484adff8 | 558 | up_write(&sdp->sd_log_flush_lock); |
f55ab26a SW |
559 | return; |
560 | } | |
561 | gfs2_log_unlock(sdp); | |
562 | } | |
563 | ||
b09e593d SW |
564 | ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL); |
565 | INIT_LIST_HEAD(&ai->ai_ail1_list); | |
566 | INIT_LIST_HEAD(&ai->ai_ail2_list); | |
b3b94faa | 567 | |
faa31ce8 | 568 | gfs2_assert_withdraw(sdp, sdp->sd_log_num_buf == sdp->sd_log_commited_buf); |
b3b94faa DT |
569 | gfs2_assert_withdraw(sdp, |
570 | sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke); | |
571 | ||
b3b94faa DT |
572 | sdp->sd_log_flush_head = sdp->sd_log_head; |
573 | sdp->sd_log_flush_wrapped = 0; | |
574 | ai->ai_first = sdp->sd_log_flush_head; | |
575 | ||
576 | lops_before_commit(sdp); | |
577 | if (!list_empty(&sdp->sd_log_flush_list)) | |
578 | log_flush_commit(sdp); | |
579 | else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle) | |
580 | log_write_header(sdp, 0, PULL); | |
581 | lops_after_commit(sdp, ai); | |
b09e593d | 582 | |
fe1a698f SW |
583 | gfs2_log_lock(sdp); |
584 | sdp->sd_log_head = sdp->sd_log_flush_head; | |
f4154ea0 | 585 | sdp->sd_log_blks_free -= sdp->sd_log_num_hdrs; |
faa31ce8 SW |
586 | sdp->sd_log_blks_reserved = 0; |
587 | sdp->sd_log_commited_buf = 0; | |
588 | sdp->sd_log_num_hdrs = 0; | |
589 | sdp->sd_log_commited_revoke = 0; | |
b3b94faa | 590 | |
b3b94faa DT |
591 | if (!list_empty(&ai->ai_ail1_list)) { |
592 | list_add(&ai->ai_list, &sdp->sd_ail1_list); | |
593 | ai = NULL; | |
594 | } | |
595 | gfs2_log_unlock(sdp); | |
596 | ||
b3b94faa | 597 | sdp->sd_vfs->s_dirt = 0; |
484adff8 | 598 | up_write(&sdp->sd_log_flush_lock); |
b3b94faa DT |
599 | |
600 | kfree(ai); | |
601 | } | |
602 | ||
603 | static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr) | |
604 | { | |
5dc39fe6 | 605 | unsigned int reserved = 0; |
b3b94faa DT |
606 | unsigned int old; |
607 | ||
608 | gfs2_log_lock(sdp); | |
609 | ||
610 | sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm; | |
611 | gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_buf) >= 0); | |
612 | sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm; | |
613 | gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0); | |
614 | ||
615 | if (sdp->sd_log_commited_buf) | |
f4154ea0 | 616 | reserved += sdp->sd_log_commited_buf; |
b3b94faa DT |
617 | if (sdp->sd_log_commited_revoke) |
618 | reserved += gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke, | |
cd915493 | 619 | sizeof(u64)); |
5dc39fe6 BM |
620 | if (reserved) |
621 | reserved++; | |
b3b94faa DT |
622 | |
623 | old = sdp->sd_log_blks_free; | |
624 | sdp->sd_log_blks_free += tr->tr_reserved - | |
625 | (reserved - sdp->sd_log_blks_reserved); | |
626 | ||
b09e593d | 627 | gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free >= old); |
b3b94faa | 628 | gfs2_assert_withdraw(sdp, |
f4154ea0 SW |
629 | sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks + |
630 | sdp->sd_log_num_hdrs); | |
b3b94faa DT |
631 | |
632 | sdp->sd_log_blks_reserved = reserved; | |
633 | ||
634 | gfs2_log_unlock(sdp); | |
635 | } | |
636 | ||
637 | /** | |
638 | * gfs2_log_commit - Commit a transaction to the log | |
639 | * @sdp: the filesystem | |
640 | * @tr: the transaction | |
641 | * | |
642 | * Returns: errno | |
643 | */ | |
644 | ||
645 | void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) | |
646 | { | |
647 | log_refund(sdp, tr); | |
648 | lops_incore_commit(sdp, tr); | |
649 | ||
650 | sdp->sd_vfs->s_dirt = 1; | |
484adff8 | 651 | up_read(&sdp->sd_log_flush_lock); |
b3b94faa | 652 | |
b3b94faa | 653 | gfs2_log_lock(sdp); |
b004157a SW |
654 | if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks)) |
655 | wake_up_process(sdp->sd_logd_process); | |
656 | gfs2_log_unlock(sdp); | |
b3b94faa DT |
657 | } |
658 | ||
659 | /** | |
660 | * gfs2_log_shutdown - write a shutdown header into a journal | |
661 | * @sdp: the filesystem | |
662 | * | |
663 | */ | |
664 | ||
665 | void gfs2_log_shutdown(struct gfs2_sbd *sdp) | |
666 | { | |
484adff8 | 667 | down_write(&sdp->sd_log_flush_lock); |
b3b94faa | 668 | |
b3b94faa DT |
669 | gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved); |
670 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_gl); | |
671 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf); | |
18ec7d5c | 672 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_jdata); |
b3b94faa DT |
673 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); |
674 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg); | |
675 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf); | |
190562bd | 676 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_hdrs); |
b3b94faa DT |
677 | gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list)); |
678 | ||
679 | sdp->sd_log_flush_head = sdp->sd_log_head; | |
680 | sdp->sd_log_flush_wrapped = 0; | |
681 | ||
682 | log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT, 0); | |
683 | ||
a74604be SW |
684 | gfs2_assert_warn(sdp, sdp->sd_log_blks_free == sdp->sd_jdesc->jd_blocks); |
685 | gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail); | |
686 | gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list)); | |
b3b94faa DT |
687 | |
688 | sdp->sd_log_head = sdp->sd_log_flush_head; | |
b3b94faa DT |
689 | sdp->sd_log_tail = sdp->sd_log_head; |
690 | ||
484adff8 | 691 | up_write(&sdp->sd_log_flush_lock); |
b3b94faa DT |
692 | } |
693 | ||
a25311c8 SW |
694 | |
695 | /** | |
696 | * gfs2_meta_syncfs - sync all the buffers in a filesystem | |
697 | * @sdp: the filesystem | |
698 | * | |
699 | */ | |
700 | ||
701 | void gfs2_meta_syncfs(struct gfs2_sbd *sdp) | |
702 | { | |
703 | gfs2_log_flush(sdp, NULL); | |
704 | for (;;) { | |
705 | gfs2_ail1_start(sdp, DIO_ALL); | |
706 | if (gfs2_ail1_empty(sdp, DIO_ALL)) | |
707 | break; | |
708 | msleep(10); | |
709 | } | |
710 | } | |
711 |