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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3 | * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. | |
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 | |
7 | * of the GNU General Public License v.2. | |
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> |
b3b94faa DT |
17 | #include <asm/semaphore.h> |
18 | ||
19 | #include "gfs2.h" | |
5c676f6d SW |
20 | #include "lm_interface.h" |
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; | |
568f4c96 SW |
51 | first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / |
52 | ssize; | |
b3b94faa DT |
53 | |
54 | if (nstruct > first) { | |
568f4c96 SW |
55 | second = (sdp->sd_sb.sb_bsize - |
56 | sizeof(struct gfs2_meta_header)) / ssize; | |
5c676f6d | 57 | blks += DIV_ROUND_UP(nstruct - first, second); |
b3b94faa DT |
58 | } |
59 | ||
60 | return blks; | |
61 | } | |
62 | ||
63 | void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags) | |
64 | { | |
65 | struct list_head *head = &sdp->sd_ail1_list; | |
66 | uint64_t sync_gen; | |
67 | struct list_head *first, *tmp; | |
68 | struct gfs2_ail *first_ai, *ai; | |
69 | ||
70 | gfs2_log_lock(sdp); | |
71 | if (list_empty(head)) { | |
72 | gfs2_log_unlock(sdp); | |
73 | return; | |
74 | } | |
75 | sync_gen = sdp->sd_ail_sync_gen++; | |
76 | ||
77 | first = head->prev; | |
78 | first_ai = list_entry(first, struct gfs2_ail, ai_list); | |
79 | first_ai->ai_sync_gen = sync_gen; | |
80 | gfs2_ail1_start_one(sdp, first_ai); | |
81 | ||
82 | if (flags & DIO_ALL) | |
83 | first = NULL; | |
84 | ||
85 | for (;;) { | |
484adff8 SW |
86 | if (first && (head->prev != first || |
87 | gfs2_ail1_empty_one(sdp, first_ai, 0))) | |
b3b94faa DT |
88 | break; |
89 | ||
90 | for (tmp = head->prev; tmp != head; tmp = tmp->prev) { | |
91 | ai = list_entry(tmp, struct gfs2_ail, ai_list); | |
92 | if (ai->ai_sync_gen >= sync_gen) | |
93 | continue; | |
94 | ai->ai_sync_gen = sync_gen; | |
95 | gfs2_ail1_start_one(sdp, ai); | |
96 | break; | |
97 | } | |
98 | ||
99 | if (tmp == head) | |
100 | break; | |
101 | } | |
102 | ||
103 | gfs2_log_unlock(sdp); | |
104 | } | |
105 | ||
106 | int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags) | |
107 | { | |
108 | struct gfs2_ail *ai, *s; | |
109 | int ret; | |
110 | ||
111 | gfs2_log_lock(sdp); | |
112 | ||
113 | list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) { | |
114 | if (gfs2_ail1_empty_one(sdp, ai, flags)) | |
115 | list_move(&ai->ai_list, &sdp->sd_ail2_list); | |
116 | else if (!(flags & DIO_ALL)) | |
117 | break; | |
118 | } | |
119 | ||
120 | ret = list_empty(&sdp->sd_ail1_list); | |
121 | ||
122 | gfs2_log_unlock(sdp); | |
123 | ||
124 | return ret; | |
125 | } | |
126 | ||
127 | static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail) | |
128 | { | |
129 | struct gfs2_ail *ai, *safe; | |
130 | unsigned int old_tail = sdp->sd_log_tail; | |
131 | int wrap = (new_tail < old_tail); | |
132 | int a, b, rm; | |
133 | ||
134 | gfs2_log_lock(sdp); | |
135 | ||
136 | list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) { | |
137 | a = (old_tail <= ai->ai_first); | |
138 | b = (ai->ai_first < new_tail); | |
139 | rm = (wrap) ? (a || b) : (a && b); | |
140 | if (!rm) | |
141 | continue; | |
142 | ||
143 | gfs2_ail2_empty_one(sdp, ai); | |
144 | list_del(&ai->ai_list); | |
145 | gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list)); | |
146 | gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list)); | |
147 | kfree(ai); | |
148 | } | |
149 | ||
150 | gfs2_log_unlock(sdp); | |
151 | } | |
152 | ||
153 | /** | |
154 | * gfs2_log_reserve - Make a log reservation | |
155 | * @sdp: The GFS2 superblock | |
156 | * @blks: The number of blocks to reserve | |
157 | * | |
158 | * Returns: errno | |
159 | */ | |
160 | ||
161 | int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks) | |
162 | { | |
b3b94faa DT |
163 | unsigned int try = 0; |
164 | ||
165 | if (gfs2_assert_warn(sdp, blks) || | |
166 | gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks)) | |
167 | return -EINVAL; | |
168 | ||
71b86f56 | 169 | mutex_lock(&sdp->sd_log_reserve_mutex); |
484adff8 SW |
170 | gfs2_log_lock(sdp); |
171 | while(sdp->sd_log_blks_free <= blks) { | |
b3b94faa | 172 | gfs2_log_unlock(sdp); |
b3b94faa DT |
173 | gfs2_ail1_empty(sdp, 0); |
174 | gfs2_log_flush(sdp); | |
175 | ||
176 | if (try++) | |
177 | gfs2_ail1_start(sdp, 0); | |
484adff8 | 178 | gfs2_log_lock(sdp); |
b3b94faa | 179 | } |
484adff8 SW |
180 | sdp->sd_log_blks_free -= blks; |
181 | gfs2_log_unlock(sdp); | |
182 | mutex_unlock(&sdp->sd_log_reserve_mutex); | |
183 | ||
184 | down_read(&sdp->sd_log_flush_lock); | |
b3b94faa DT |
185 | |
186 | return 0; | |
187 | } | |
188 | ||
189 | /** | |
190 | * gfs2_log_release - Release a given number of log blocks | |
191 | * @sdp: The GFS2 superblock | |
192 | * @blks: The number of blocks | |
193 | * | |
194 | */ | |
195 | ||
196 | void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks) | |
197 | { | |
484adff8 | 198 | up_read(&sdp->sd_log_flush_lock); |
b3b94faa DT |
199 | |
200 | gfs2_log_lock(sdp); | |
201 | sdp->sd_log_blks_free += blks; | |
202 | gfs2_assert_withdraw(sdp, | |
203 | sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); | |
204 | gfs2_log_unlock(sdp); | |
205 | } | |
206 | ||
207 | static uint64_t log_bmap(struct gfs2_sbd *sdp, unsigned int lbn) | |
208 | { | |
209 | int new = 0; | |
210 | uint64_t dbn; | |
211 | int error; | |
212 | ||
5c676f6d | 213 | error = gfs2_block_map(sdp->sd_jdesc->jd_inode->u.generic_ip, |
568f4c96 | 214 | lbn, &new, &dbn, NULL); |
b3b94faa DT |
215 | gfs2_assert_withdraw(sdp, !error && dbn); |
216 | ||
217 | return dbn; | |
218 | } | |
219 | ||
220 | /** | |
221 | * log_distance - Compute distance between two journal blocks | |
222 | * @sdp: The GFS2 superblock | |
223 | * @newer: The most recent journal block of the pair | |
224 | * @older: The older journal block of the pair | |
225 | * | |
226 | * Compute the distance (in the journal direction) between two | |
227 | * blocks in the journal | |
228 | * | |
229 | * Returns: the distance in blocks | |
230 | */ | |
231 | ||
232 | static inline unsigned int log_distance(struct gfs2_sbd *sdp, | |
233 | unsigned int newer, | |
234 | unsigned int older) | |
235 | { | |
236 | int dist; | |
237 | ||
238 | dist = newer - older; | |
239 | if (dist < 0) | |
240 | dist += sdp->sd_jdesc->jd_blocks; | |
241 | ||
242 | return dist; | |
243 | } | |
244 | ||
245 | static unsigned int current_tail(struct gfs2_sbd *sdp) | |
246 | { | |
247 | struct gfs2_ail *ai; | |
248 | unsigned int tail; | |
249 | ||
250 | gfs2_log_lock(sdp); | |
251 | ||
252 | if (list_empty(&sdp->sd_ail1_list)) | |
253 | tail = sdp->sd_log_head; | |
254 | else { | |
255 | ai = list_entry(sdp->sd_ail1_list.prev, | |
256 | struct gfs2_ail, ai_list); | |
257 | tail = ai->ai_first; | |
258 | } | |
259 | ||
260 | gfs2_log_unlock(sdp); | |
261 | ||
262 | return tail; | |
263 | } | |
264 | ||
265 | static inline void log_incr_head(struct gfs2_sbd *sdp) | |
266 | { | |
267 | if (sdp->sd_log_flush_head == sdp->sd_log_tail) | |
268 | gfs2_assert_withdraw(sdp, | |
269 | sdp->sd_log_flush_head == sdp->sd_log_head); | |
270 | ||
271 | if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) { | |
272 | sdp->sd_log_flush_head = 0; | |
273 | sdp->sd_log_flush_wrapped = 1; | |
274 | } | |
275 | } | |
276 | ||
277 | /** | |
278 | * gfs2_log_get_buf - Get and initialize a buffer to use for log control data | |
279 | * @sdp: The GFS2 superblock | |
280 | * | |
281 | * Returns: the buffer_head | |
282 | */ | |
283 | ||
284 | struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp) | |
285 | { | |
286 | uint64_t blkno = log_bmap(sdp, sdp->sd_log_flush_head); | |
287 | struct gfs2_log_buf *lb; | |
288 | struct buffer_head *bh; | |
289 | ||
4f3df041 | 290 | lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
291 | list_add(&lb->lb_list, &sdp->sd_log_flush_list); |
292 | ||
293 | bh = lb->lb_bh = sb_getblk(sdp->sd_vfs, blkno); | |
294 | lock_buffer(bh); | |
295 | memset(bh->b_data, 0, bh->b_size); | |
296 | set_buffer_uptodate(bh); | |
297 | clear_buffer_dirty(bh); | |
298 | unlock_buffer(bh); | |
299 | ||
300 | log_incr_head(sdp); | |
301 | ||
302 | return bh; | |
303 | } | |
304 | ||
305 | /** | |
306 | * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log | |
307 | * @sdp: the filesystem | |
308 | * @data: the data the buffer_head should point to | |
309 | * | |
310 | * Returns: the log buffer descriptor | |
311 | */ | |
312 | ||
313 | struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp, | |
314 | struct buffer_head *real) | |
315 | { | |
316 | uint64_t blkno = log_bmap(sdp, sdp->sd_log_flush_head); | |
317 | struct gfs2_log_buf *lb; | |
318 | struct buffer_head *bh; | |
319 | ||
4f3df041 | 320 | lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
321 | list_add(&lb->lb_list, &sdp->sd_log_flush_list); |
322 | lb->lb_real = real; | |
323 | ||
324 | bh = lb->lb_bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL); | |
325 | atomic_set(&bh->b_count, 1); | |
326 | bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate); | |
18ec7d5c | 327 | set_bh_page(bh, real->b_page, bh_offset(real)); |
b3b94faa DT |
328 | bh->b_blocknr = blkno; |
329 | bh->b_size = sdp->sd_sb.sb_bsize; | |
330 | bh->b_bdev = sdp->sd_vfs->s_bdev; | |
331 | ||
332 | log_incr_head(sdp); | |
333 | ||
334 | return bh; | |
335 | } | |
336 | ||
337 | static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail, int pull) | |
338 | { | |
339 | unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail); | |
340 | ||
341 | ail2_empty(sdp, new_tail); | |
342 | ||
343 | gfs2_log_lock(sdp); | |
344 | sdp->sd_log_blks_free += dist - ((pull) ? 1 : 0); | |
345 | gfs2_assert_withdraw(sdp, | |
346 | sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); | |
347 | gfs2_log_unlock(sdp); | |
348 | ||
349 | sdp->sd_log_tail = new_tail; | |
350 | } | |
351 | ||
352 | /** | |
353 | * log_write_header - Get and initialize a journal header buffer | |
354 | * @sdp: The GFS2 superblock | |
355 | * | |
356 | * Returns: the initialized log buffer descriptor | |
357 | */ | |
358 | ||
359 | static void log_write_header(struct gfs2_sbd *sdp, uint32_t flags, int pull) | |
360 | { | |
361 | uint64_t blkno = log_bmap(sdp, sdp->sd_log_flush_head); | |
362 | struct buffer_head *bh; | |
363 | struct gfs2_log_header *lh; | |
364 | unsigned int tail; | |
365 | uint32_t hash; | |
366 | ||
b3b94faa DT |
367 | bh = sb_getblk(sdp->sd_vfs, blkno); |
368 | lock_buffer(bh); | |
369 | memset(bh->b_data, 0, bh->b_size); | |
370 | set_buffer_uptodate(bh); | |
371 | clear_buffer_dirty(bh); | |
372 | unlock_buffer(bh); | |
373 | ||
374 | gfs2_ail1_empty(sdp, 0); | |
375 | tail = current_tail(sdp); | |
376 | ||
377 | lh = (struct gfs2_log_header *)bh->b_data; | |
378 | memset(lh, 0, sizeof(struct gfs2_log_header)); | |
379 | lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC); | |
e3167ded SW |
380 | lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH); |
381 | lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH); | |
b3b94faa DT |
382 | lh->lh_sequence = be64_to_cpu(sdp->sd_log_sequence++); |
383 | lh->lh_flags = be32_to_cpu(flags); | |
384 | lh->lh_tail = be32_to_cpu(tail); | |
385 | lh->lh_blkno = be32_to_cpu(sdp->sd_log_flush_head); | |
386 | hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header)); | |
387 | lh->lh_hash = cpu_to_be32(hash); | |
388 | ||
389 | set_buffer_dirty(bh); | |
390 | if (sync_dirty_buffer(bh)) | |
391 | gfs2_io_error_bh(sdp, bh); | |
392 | brelse(bh); | |
393 | ||
394 | if (sdp->sd_log_tail != tail) | |
395 | log_pull_tail(sdp, tail, pull); | |
396 | else | |
397 | gfs2_assert_withdraw(sdp, !pull); | |
398 | ||
399 | sdp->sd_log_idle = (tail == sdp->sd_log_flush_head); | |
400 | log_incr_head(sdp); | |
401 | } | |
402 | ||
403 | static void log_flush_commit(struct gfs2_sbd *sdp) | |
404 | { | |
405 | struct list_head *head = &sdp->sd_log_flush_list; | |
406 | struct gfs2_log_buf *lb; | |
407 | struct buffer_head *bh; | |
408 | unsigned int d; | |
409 | ||
410 | d = log_distance(sdp, sdp->sd_log_flush_head, sdp->sd_log_head); | |
411 | ||
412 | gfs2_assert_withdraw(sdp, d + 1 == sdp->sd_log_blks_reserved); | |
413 | ||
414 | while (!list_empty(head)) { | |
415 | lb = list_entry(head->next, struct gfs2_log_buf, lb_list); | |
416 | list_del(&lb->lb_list); | |
417 | bh = lb->lb_bh; | |
418 | ||
419 | wait_on_buffer(bh); | |
420 | if (!buffer_uptodate(bh)) | |
421 | gfs2_io_error_bh(sdp, bh); | |
422 | if (lb->lb_real) { | |
423 | while (atomic_read(&bh->b_count) != 1) /* Grrrr... */ | |
424 | schedule(); | |
425 | free_buffer_head(bh); | |
426 | } else | |
427 | brelse(bh); | |
428 | kfree(lb); | |
429 | } | |
430 | ||
431 | log_write_header(sdp, 0, 0); | |
432 | } | |
433 | ||
434 | /** | |
435 | * gfs2_log_flush_i - flush incore transaction(s) | |
436 | * @sdp: the filesystem | |
437 | * @gl: The glock structure to flush. If NULL, flush the whole incore log | |
438 | * | |
439 | */ | |
440 | ||
441 | void gfs2_log_flush_i(struct gfs2_sbd *sdp, struct gfs2_glock *gl) | |
442 | { | |
443 | struct gfs2_ail *ai; | |
444 | ||
4f3df041 | 445 | ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
446 | INIT_LIST_HEAD(&ai->ai_ail1_list); |
447 | INIT_LIST_HEAD(&ai->ai_ail2_list); | |
484adff8 SW |
448 | |
449 | down_write(&sdp->sd_log_flush_lock); | |
f55ab26a SW |
450 | |
451 | if (gl) { | |
452 | gfs2_log_lock(sdp); | |
453 | if (list_empty(&gl->gl_le.le_list)) { | |
454 | gfs2_log_unlock(sdp); | |
484adff8 | 455 | up_write(&sdp->sd_log_flush_lock); |
f55ab26a SW |
456 | kfree(ai); |
457 | return; | |
458 | } | |
459 | gfs2_log_unlock(sdp); | |
460 | } | |
461 | ||
b3b94faa DT |
462 | |
463 | gfs2_assert_withdraw(sdp, | |
464 | sdp->sd_log_num_buf == sdp->sd_log_commited_buf); | |
465 | gfs2_assert_withdraw(sdp, | |
466 | sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke); | |
467 | ||
b3b94faa DT |
468 | sdp->sd_log_flush_head = sdp->sd_log_head; |
469 | sdp->sd_log_flush_wrapped = 0; | |
470 | ai->ai_first = sdp->sd_log_flush_head; | |
471 | ||
472 | lops_before_commit(sdp); | |
473 | if (!list_empty(&sdp->sd_log_flush_list)) | |
474 | log_flush_commit(sdp); | |
475 | else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle) | |
476 | log_write_header(sdp, 0, PULL); | |
477 | lops_after_commit(sdp, ai); | |
b3b94faa DT |
478 | sdp->sd_log_head = sdp->sd_log_flush_head; |
479 | if (sdp->sd_log_flush_wrapped) | |
480 | sdp->sd_log_wraps++; | |
481 | ||
482 | sdp->sd_log_blks_reserved = | |
483 | sdp->sd_log_commited_buf = | |
484 | sdp->sd_log_commited_revoke = 0; | |
485 | ||
486 | gfs2_log_lock(sdp); | |
487 | if (!list_empty(&ai->ai_ail1_list)) { | |
488 | list_add(&ai->ai_list, &sdp->sd_ail1_list); | |
489 | ai = NULL; | |
490 | } | |
491 | gfs2_log_unlock(sdp); | |
492 | ||
b3b94faa | 493 | sdp->sd_vfs->s_dirt = 0; |
484adff8 | 494 | up_write(&sdp->sd_log_flush_lock); |
b3b94faa DT |
495 | |
496 | kfree(ai); | |
497 | } | |
498 | ||
499 | static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr) | |
500 | { | |
501 | unsigned int reserved = 1; | |
502 | unsigned int old; | |
503 | ||
504 | gfs2_log_lock(sdp); | |
505 | ||
506 | sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm; | |
507 | gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_buf) >= 0); | |
508 | sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm; | |
509 | gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0); | |
510 | ||
511 | if (sdp->sd_log_commited_buf) | |
568f4c96 SW |
512 | reserved += 1 + sdp->sd_log_commited_buf + |
513 | sdp->sd_log_commited_buf/503; | |
b3b94faa DT |
514 | if (sdp->sd_log_commited_revoke) |
515 | reserved += gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke, | |
516 | sizeof(uint64_t)); | |
517 | ||
518 | old = sdp->sd_log_blks_free; | |
519 | sdp->sd_log_blks_free += tr->tr_reserved - | |
520 | (reserved - sdp->sd_log_blks_reserved); | |
521 | ||
522 | gfs2_assert_withdraw(sdp, | |
523 | sdp->sd_log_blks_free >= old); | |
524 | gfs2_assert_withdraw(sdp, | |
525 | sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); | |
526 | ||
527 | sdp->sd_log_blks_reserved = reserved; | |
528 | ||
529 | gfs2_log_unlock(sdp); | |
530 | } | |
531 | ||
532 | /** | |
533 | * gfs2_log_commit - Commit a transaction to the log | |
534 | * @sdp: the filesystem | |
535 | * @tr: the transaction | |
536 | * | |
537 | * Returns: errno | |
538 | */ | |
539 | ||
540 | void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) | |
541 | { | |
542 | log_refund(sdp, tr); | |
543 | lops_incore_commit(sdp, tr); | |
544 | ||
545 | sdp->sd_vfs->s_dirt = 1; | |
484adff8 | 546 | up_read(&sdp->sd_log_flush_lock); |
b3b94faa | 547 | |
b3b94faa DT |
548 | gfs2_log_lock(sdp); |
549 | if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks)) { | |
550 | gfs2_log_unlock(sdp); | |
551 | gfs2_log_flush(sdp); | |
552 | } else | |
553 | gfs2_log_unlock(sdp); | |
554 | } | |
555 | ||
556 | /** | |
557 | * gfs2_log_shutdown - write a shutdown header into a journal | |
558 | * @sdp: the filesystem | |
559 | * | |
560 | */ | |
561 | ||
562 | void gfs2_log_shutdown(struct gfs2_sbd *sdp) | |
563 | { | |
484adff8 | 564 | down_write(&sdp->sd_log_flush_lock); |
b3b94faa | 565 | |
b3b94faa DT |
566 | gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved); |
567 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_gl); | |
568 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf); | |
18ec7d5c | 569 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_jdata); |
b3b94faa DT |
570 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); |
571 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg); | |
572 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf); | |
573 | gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list)); | |
574 | ||
575 | sdp->sd_log_flush_head = sdp->sd_log_head; | |
576 | sdp->sd_log_flush_wrapped = 0; | |
577 | ||
578 | log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT, 0); | |
579 | ||
580 | gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free == | |
581 | sdp->sd_jdesc->jd_blocks); | |
582 | gfs2_assert_withdraw(sdp, sdp->sd_log_head == sdp->sd_log_tail); | |
583 | gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail2_list)); | |
584 | ||
585 | sdp->sd_log_head = sdp->sd_log_flush_head; | |
586 | if (sdp->sd_log_flush_wrapped) | |
587 | sdp->sd_log_wraps++; | |
588 | sdp->sd_log_tail = sdp->sd_log_head; | |
589 | ||
484adff8 | 590 | up_write(&sdp->sd_log_flush_lock); |
b3b94faa DT |
591 | } |
592 |