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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> | |
15 | #include <asm/semaphore.h> | |
16 | ||
17 | #include "gfs2.h" | |
18 | #include "bmap.h" | |
19 | #include "glock.h" | |
20 | #include "log.h" | |
21 | #include "lops.h" | |
22 | #include "meta_io.h" | |
23 | ||
24 | #define PULL 1 | |
25 | ||
26 | static inline int is_done(struct gfs2_sbd *sdp, atomic_t *a) | |
27 | { | |
28 | int done; | |
29 | gfs2_log_lock(sdp); | |
30 | done = atomic_read(a) ? 0 : 1; | |
31 | gfs2_log_unlock(sdp); | |
32 | return done; | |
33 | } | |
34 | ||
35 | static void do_lock_wait(struct gfs2_sbd *sdp, wait_queue_head_t *wq, | |
36 | atomic_t *a) | |
37 | { | |
38 | gfs2_log_unlock(sdp); | |
39 | wait_event(*wq, is_done(sdp, a)); | |
40 | gfs2_log_lock(sdp); | |
41 | } | |
42 | ||
43 | static void lock_for_trans(struct gfs2_sbd *sdp) | |
44 | { | |
45 | gfs2_log_lock(sdp); | |
46 | do_lock_wait(sdp, &sdp->sd_log_trans_wq, &sdp->sd_log_flush_count); | |
47 | atomic_inc(&sdp->sd_log_trans_count); | |
48 | gfs2_log_unlock(sdp); | |
49 | } | |
50 | ||
51 | static void unlock_from_trans(struct gfs2_sbd *sdp) | |
52 | { | |
53 | gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_trans_count)); | |
54 | if (atomic_dec_and_test(&sdp->sd_log_trans_count)) | |
55 | wake_up(&sdp->sd_log_flush_wq); | |
56 | } | |
57 | ||
58 | void gfs2_lock_for_flush(struct gfs2_sbd *sdp) | |
59 | { | |
60 | gfs2_log_lock(sdp); | |
61 | atomic_inc(&sdp->sd_log_flush_count); | |
62 | do_lock_wait(sdp, &sdp->sd_log_flush_wq, &sdp->sd_log_trans_count); | |
63 | gfs2_log_unlock(sdp); | |
64 | } | |
65 | ||
66 | void gfs2_unlock_from_flush(struct gfs2_sbd *sdp) | |
67 | { | |
68 | gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_flush_count)); | |
69 | if (atomic_dec_and_test(&sdp->sd_log_flush_count)) | |
70 | wake_up(&sdp->sd_log_trans_wq); | |
71 | } | |
72 | ||
73 | /** | |
74 | * gfs2_struct2blk - compute stuff | |
75 | * @sdp: the filesystem | |
76 | * @nstruct: the number of structures | |
77 | * @ssize: the size of the structures | |
78 | * | |
79 | * Compute the number of log descriptor blocks needed to hold a certain number | |
80 | * of structures of a certain size. | |
81 | * | |
82 | * Returns: the number of blocks needed (minimum is always 1) | |
83 | */ | |
84 | ||
85 | unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct, | |
86 | unsigned int ssize) | |
87 | { | |
88 | unsigned int blks; | |
89 | unsigned int first, second; | |
90 | ||
91 | blks = 1; | |
92 | first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / ssize; | |
93 | ||
94 | if (nstruct > first) { | |
95 | second = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header)) / ssize; | |
96 | blks += DIV_RU(nstruct - first, second); | |
97 | } | |
98 | ||
99 | return blks; | |
100 | } | |
101 | ||
102 | void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags) | |
103 | { | |
104 | struct list_head *head = &sdp->sd_ail1_list; | |
105 | uint64_t sync_gen; | |
106 | struct list_head *first, *tmp; | |
107 | struct gfs2_ail *first_ai, *ai; | |
108 | ||
109 | gfs2_log_lock(sdp); | |
110 | if (list_empty(head)) { | |
111 | gfs2_log_unlock(sdp); | |
112 | return; | |
113 | } | |
114 | sync_gen = sdp->sd_ail_sync_gen++; | |
115 | ||
116 | first = head->prev; | |
117 | first_ai = list_entry(first, struct gfs2_ail, ai_list); | |
118 | first_ai->ai_sync_gen = sync_gen; | |
119 | gfs2_ail1_start_one(sdp, first_ai); | |
120 | ||
121 | if (flags & DIO_ALL) | |
122 | first = NULL; | |
123 | ||
124 | for (;;) { | |
125 | if (first && | |
126 | (head->prev != first || | |
127 | gfs2_ail1_empty_one(sdp, first_ai, 0))) | |
128 | break; | |
129 | ||
130 | for (tmp = head->prev; tmp != head; tmp = tmp->prev) { | |
131 | ai = list_entry(tmp, struct gfs2_ail, ai_list); | |
132 | if (ai->ai_sync_gen >= sync_gen) | |
133 | continue; | |
134 | ai->ai_sync_gen = sync_gen; | |
135 | gfs2_ail1_start_one(sdp, ai); | |
136 | break; | |
137 | } | |
138 | ||
139 | if (tmp == head) | |
140 | break; | |
141 | } | |
142 | ||
143 | gfs2_log_unlock(sdp); | |
144 | } | |
145 | ||
146 | int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags) | |
147 | { | |
148 | struct gfs2_ail *ai, *s; | |
149 | int ret; | |
150 | ||
151 | gfs2_log_lock(sdp); | |
152 | ||
153 | list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) { | |
154 | if (gfs2_ail1_empty_one(sdp, ai, flags)) | |
155 | list_move(&ai->ai_list, &sdp->sd_ail2_list); | |
156 | else if (!(flags & DIO_ALL)) | |
157 | break; | |
158 | } | |
159 | ||
160 | ret = list_empty(&sdp->sd_ail1_list); | |
161 | ||
162 | gfs2_log_unlock(sdp); | |
163 | ||
164 | return ret; | |
165 | } | |
166 | ||
167 | static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail) | |
168 | { | |
169 | struct gfs2_ail *ai, *safe; | |
170 | unsigned int old_tail = sdp->sd_log_tail; | |
171 | int wrap = (new_tail < old_tail); | |
172 | int a, b, rm; | |
173 | ||
174 | gfs2_log_lock(sdp); | |
175 | ||
176 | list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) { | |
177 | a = (old_tail <= ai->ai_first); | |
178 | b = (ai->ai_first < new_tail); | |
179 | rm = (wrap) ? (a || b) : (a && b); | |
180 | if (!rm) | |
181 | continue; | |
182 | ||
183 | gfs2_ail2_empty_one(sdp, ai); | |
184 | list_del(&ai->ai_list); | |
185 | gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list)); | |
186 | gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list)); | |
187 | kfree(ai); | |
188 | } | |
189 | ||
190 | gfs2_log_unlock(sdp); | |
191 | } | |
192 | ||
193 | /** | |
194 | * gfs2_log_reserve - Make a log reservation | |
195 | * @sdp: The GFS2 superblock | |
196 | * @blks: The number of blocks to reserve | |
197 | * | |
198 | * Returns: errno | |
199 | */ | |
200 | ||
201 | int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks) | |
202 | { | |
203 | LIST_HEAD(list); | |
204 | unsigned int try = 0; | |
205 | ||
206 | if (gfs2_assert_warn(sdp, blks) || | |
207 | gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks)) | |
208 | return -EINVAL; | |
209 | ||
210 | for (;;) { | |
211 | gfs2_log_lock(sdp); | |
212 | ||
213 | if (list_empty(&list)) { | |
214 | list_add_tail(&list, &sdp->sd_log_blks_list); | |
215 | while (sdp->sd_log_blks_list.next != &list) { | |
216 | DECLARE_WAITQUEUE(__wait_chan, current); | |
217 | set_current_state(TASK_UNINTERRUPTIBLE); | |
218 | add_wait_queue(&sdp->sd_log_blks_wait, | |
219 | &__wait_chan); | |
220 | gfs2_log_unlock(sdp); | |
221 | schedule(); | |
222 | gfs2_log_lock(sdp); | |
223 | remove_wait_queue(&sdp->sd_log_blks_wait, | |
224 | &__wait_chan); | |
225 | set_current_state(TASK_RUNNING); | |
226 | } | |
227 | } | |
228 | ||
229 | /* Never give away the last block so we can | |
230 | always pull the tail if we need to. */ | |
231 | if (sdp->sd_log_blks_free > blks) { | |
232 | sdp->sd_log_blks_free -= blks; | |
233 | list_del(&list); | |
234 | gfs2_log_unlock(sdp); | |
235 | wake_up(&sdp->sd_log_blks_wait); | |
236 | break; | |
237 | } | |
238 | ||
239 | gfs2_log_unlock(sdp); | |
240 | ||
241 | gfs2_ail1_empty(sdp, 0); | |
242 | gfs2_log_flush(sdp); | |
243 | ||
244 | if (try++) | |
245 | gfs2_ail1_start(sdp, 0); | |
246 | } | |
247 | ||
248 | lock_for_trans(sdp); | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | /** | |
254 | * gfs2_log_release - Release a given number of log blocks | |
255 | * @sdp: The GFS2 superblock | |
256 | * @blks: The number of blocks | |
257 | * | |
258 | */ | |
259 | ||
260 | void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks) | |
261 | { | |
262 | unlock_from_trans(sdp); | |
263 | ||
264 | gfs2_log_lock(sdp); | |
265 | sdp->sd_log_blks_free += blks; | |
266 | gfs2_assert_withdraw(sdp, | |
267 | sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); | |
268 | gfs2_log_unlock(sdp); | |
269 | } | |
270 | ||
271 | static uint64_t log_bmap(struct gfs2_sbd *sdp, unsigned int lbn) | |
272 | { | |
273 | int new = 0; | |
274 | uint64_t dbn; | |
275 | int error; | |
276 | ||
7359a19c | 277 | error = gfs2_block_map(get_v2ip(sdp->sd_jdesc->jd_inode), lbn, &new, &dbn, NULL); |
b3b94faa DT |
278 | gfs2_assert_withdraw(sdp, !error && dbn); |
279 | ||
280 | return dbn; | |
281 | } | |
282 | ||
283 | /** | |
284 | * log_distance - Compute distance between two journal blocks | |
285 | * @sdp: The GFS2 superblock | |
286 | * @newer: The most recent journal block of the pair | |
287 | * @older: The older journal block of the pair | |
288 | * | |
289 | * Compute the distance (in the journal direction) between two | |
290 | * blocks in the journal | |
291 | * | |
292 | * Returns: the distance in blocks | |
293 | */ | |
294 | ||
295 | static inline unsigned int log_distance(struct gfs2_sbd *sdp, | |
296 | unsigned int newer, | |
297 | unsigned int older) | |
298 | { | |
299 | int dist; | |
300 | ||
301 | dist = newer - older; | |
302 | if (dist < 0) | |
303 | dist += sdp->sd_jdesc->jd_blocks; | |
304 | ||
305 | return dist; | |
306 | } | |
307 | ||
308 | static unsigned int current_tail(struct gfs2_sbd *sdp) | |
309 | { | |
310 | struct gfs2_ail *ai; | |
311 | unsigned int tail; | |
312 | ||
313 | gfs2_log_lock(sdp); | |
314 | ||
315 | if (list_empty(&sdp->sd_ail1_list)) | |
316 | tail = sdp->sd_log_head; | |
317 | else { | |
318 | ai = list_entry(sdp->sd_ail1_list.prev, | |
319 | struct gfs2_ail, ai_list); | |
320 | tail = ai->ai_first; | |
321 | } | |
322 | ||
323 | gfs2_log_unlock(sdp); | |
324 | ||
325 | return tail; | |
326 | } | |
327 | ||
328 | static inline void log_incr_head(struct gfs2_sbd *sdp) | |
329 | { | |
330 | if (sdp->sd_log_flush_head == sdp->sd_log_tail) | |
331 | gfs2_assert_withdraw(sdp, | |
332 | sdp->sd_log_flush_head == sdp->sd_log_head); | |
333 | ||
334 | if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) { | |
335 | sdp->sd_log_flush_head = 0; | |
336 | sdp->sd_log_flush_wrapped = 1; | |
337 | } | |
338 | } | |
339 | ||
340 | /** | |
341 | * gfs2_log_get_buf - Get and initialize a buffer to use for log control data | |
342 | * @sdp: The GFS2 superblock | |
343 | * | |
344 | * Returns: the buffer_head | |
345 | */ | |
346 | ||
347 | struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp) | |
348 | { | |
349 | uint64_t blkno = log_bmap(sdp, sdp->sd_log_flush_head); | |
350 | struct gfs2_log_buf *lb; | |
351 | struct buffer_head *bh; | |
352 | ||
4f3df041 | 353 | lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
354 | list_add(&lb->lb_list, &sdp->sd_log_flush_list); |
355 | ||
356 | bh = lb->lb_bh = sb_getblk(sdp->sd_vfs, blkno); | |
357 | lock_buffer(bh); | |
358 | memset(bh->b_data, 0, bh->b_size); | |
359 | set_buffer_uptodate(bh); | |
360 | clear_buffer_dirty(bh); | |
361 | unlock_buffer(bh); | |
362 | ||
363 | log_incr_head(sdp); | |
364 | ||
365 | return bh; | |
366 | } | |
367 | ||
368 | /** | |
369 | * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log | |
370 | * @sdp: the filesystem | |
371 | * @data: the data the buffer_head should point to | |
372 | * | |
373 | * Returns: the log buffer descriptor | |
374 | */ | |
375 | ||
376 | struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp, | |
377 | struct buffer_head *real) | |
378 | { | |
379 | uint64_t blkno = log_bmap(sdp, sdp->sd_log_flush_head); | |
380 | struct gfs2_log_buf *lb; | |
381 | struct buffer_head *bh; | |
382 | ||
4f3df041 | 383 | lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
384 | list_add(&lb->lb_list, &sdp->sd_log_flush_list); |
385 | lb->lb_real = real; | |
386 | ||
387 | bh = lb->lb_bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL); | |
388 | atomic_set(&bh->b_count, 1); | |
389 | bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate); | |
18ec7d5c | 390 | set_bh_page(bh, real->b_page, bh_offset(real)); |
b3b94faa DT |
391 | bh->b_blocknr = blkno; |
392 | bh->b_size = sdp->sd_sb.sb_bsize; | |
393 | bh->b_bdev = sdp->sd_vfs->s_bdev; | |
394 | ||
395 | log_incr_head(sdp); | |
396 | ||
397 | return bh; | |
398 | } | |
399 | ||
400 | static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail, int pull) | |
401 | { | |
402 | unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail); | |
403 | ||
404 | ail2_empty(sdp, new_tail); | |
405 | ||
406 | gfs2_log_lock(sdp); | |
407 | sdp->sd_log_blks_free += dist - ((pull) ? 1 : 0); | |
408 | gfs2_assert_withdraw(sdp, | |
409 | sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); | |
410 | gfs2_log_unlock(sdp); | |
411 | ||
412 | sdp->sd_log_tail = new_tail; | |
413 | } | |
414 | ||
415 | /** | |
416 | * log_write_header - Get and initialize a journal header buffer | |
417 | * @sdp: The GFS2 superblock | |
418 | * | |
419 | * Returns: the initialized log buffer descriptor | |
420 | */ | |
421 | ||
422 | static void log_write_header(struct gfs2_sbd *sdp, uint32_t flags, int pull) | |
423 | { | |
424 | uint64_t blkno = log_bmap(sdp, sdp->sd_log_flush_head); | |
425 | struct buffer_head *bh; | |
426 | struct gfs2_log_header *lh; | |
427 | unsigned int tail; | |
428 | uint32_t hash; | |
429 | ||
430 | atomic_inc(&sdp->sd_log_flush_ondisk); | |
431 | ||
432 | bh = sb_getblk(sdp->sd_vfs, blkno); | |
433 | lock_buffer(bh); | |
434 | memset(bh->b_data, 0, bh->b_size); | |
435 | set_buffer_uptodate(bh); | |
436 | clear_buffer_dirty(bh); | |
437 | unlock_buffer(bh); | |
438 | ||
439 | gfs2_ail1_empty(sdp, 0); | |
440 | tail = current_tail(sdp); | |
441 | ||
442 | lh = (struct gfs2_log_header *)bh->b_data; | |
443 | memset(lh, 0, sizeof(struct gfs2_log_header)); | |
444 | lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC); | |
445 | lh->lh_header.mh_type = cpu_to_be16(GFS2_METATYPE_LH); | |
446 | lh->lh_header.mh_format = cpu_to_be16(GFS2_FORMAT_LH); | |
447 | lh->lh_sequence = be64_to_cpu(sdp->sd_log_sequence++); | |
448 | lh->lh_flags = be32_to_cpu(flags); | |
449 | lh->lh_tail = be32_to_cpu(tail); | |
450 | lh->lh_blkno = be32_to_cpu(sdp->sd_log_flush_head); | |
451 | hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header)); | |
452 | lh->lh_hash = cpu_to_be32(hash); | |
453 | ||
454 | set_buffer_dirty(bh); | |
455 | if (sync_dirty_buffer(bh)) | |
456 | gfs2_io_error_bh(sdp, bh); | |
457 | brelse(bh); | |
458 | ||
459 | if (sdp->sd_log_tail != tail) | |
460 | log_pull_tail(sdp, tail, pull); | |
461 | else | |
462 | gfs2_assert_withdraw(sdp, !pull); | |
463 | ||
464 | sdp->sd_log_idle = (tail == sdp->sd_log_flush_head); | |
465 | log_incr_head(sdp); | |
466 | } | |
467 | ||
468 | static void log_flush_commit(struct gfs2_sbd *sdp) | |
469 | { | |
470 | struct list_head *head = &sdp->sd_log_flush_list; | |
471 | struct gfs2_log_buf *lb; | |
472 | struct buffer_head *bh; | |
473 | unsigned int d; | |
474 | ||
475 | d = log_distance(sdp, sdp->sd_log_flush_head, sdp->sd_log_head); | |
476 | ||
477 | gfs2_assert_withdraw(sdp, d + 1 == sdp->sd_log_blks_reserved); | |
478 | ||
479 | while (!list_empty(head)) { | |
480 | lb = list_entry(head->next, struct gfs2_log_buf, lb_list); | |
481 | list_del(&lb->lb_list); | |
482 | bh = lb->lb_bh; | |
483 | ||
484 | wait_on_buffer(bh); | |
485 | if (!buffer_uptodate(bh)) | |
486 | gfs2_io_error_bh(sdp, bh); | |
487 | if (lb->lb_real) { | |
488 | while (atomic_read(&bh->b_count) != 1) /* Grrrr... */ | |
489 | schedule(); | |
490 | free_buffer_head(bh); | |
491 | } else | |
492 | brelse(bh); | |
493 | kfree(lb); | |
494 | } | |
495 | ||
496 | log_write_header(sdp, 0, 0); | |
497 | } | |
498 | ||
499 | /** | |
500 | * gfs2_log_flush_i - flush incore transaction(s) | |
501 | * @sdp: the filesystem | |
502 | * @gl: The glock structure to flush. If NULL, flush the whole incore log | |
503 | * | |
504 | */ | |
505 | ||
506 | void gfs2_log_flush_i(struct gfs2_sbd *sdp, struct gfs2_glock *gl) | |
507 | { | |
508 | struct gfs2_ail *ai; | |
509 | ||
510 | atomic_inc(&sdp->sd_log_flush_incore); | |
511 | ||
4f3df041 | 512 | ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
513 | INIT_LIST_HEAD(&ai->ai_ail1_list); |
514 | INIT_LIST_HEAD(&ai->ai_ail2_list); | |
515 | ||
516 | gfs2_lock_for_flush(sdp); | |
517 | down(&sdp->sd_log_flush_lock); | |
518 | ||
519 | gfs2_assert_withdraw(sdp, | |
520 | sdp->sd_log_num_buf == sdp->sd_log_commited_buf); | |
521 | gfs2_assert_withdraw(sdp, | |
522 | sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke); | |
523 | ||
524 | if (gl && list_empty(&gl->gl_le.le_list)) { | |
525 | up(&sdp->sd_log_flush_lock); | |
526 | gfs2_unlock_from_flush(sdp); | |
527 | kfree(ai); | |
528 | return; | |
529 | } | |
530 | ||
531 | sdp->sd_log_flush_head = sdp->sd_log_head; | |
532 | sdp->sd_log_flush_wrapped = 0; | |
533 | ai->ai_first = sdp->sd_log_flush_head; | |
534 | ||
535 | lops_before_commit(sdp); | |
536 | if (!list_empty(&sdp->sd_log_flush_list)) | |
537 | log_flush_commit(sdp); | |
538 | else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle) | |
539 | log_write_header(sdp, 0, PULL); | |
540 | lops_after_commit(sdp, ai); | |
541 | ||
542 | sdp->sd_log_head = sdp->sd_log_flush_head; | |
543 | if (sdp->sd_log_flush_wrapped) | |
544 | sdp->sd_log_wraps++; | |
545 | ||
546 | sdp->sd_log_blks_reserved = | |
547 | sdp->sd_log_commited_buf = | |
548 | sdp->sd_log_commited_revoke = 0; | |
549 | ||
550 | gfs2_log_lock(sdp); | |
551 | if (!list_empty(&ai->ai_ail1_list)) { | |
552 | list_add(&ai->ai_list, &sdp->sd_ail1_list); | |
553 | ai = NULL; | |
554 | } | |
555 | gfs2_log_unlock(sdp); | |
556 | ||
557 | up(&sdp->sd_log_flush_lock); | |
558 | sdp->sd_vfs->s_dirt = 0; | |
559 | gfs2_unlock_from_flush(sdp); | |
560 | ||
561 | kfree(ai); | |
562 | } | |
563 | ||
564 | static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr) | |
565 | { | |
566 | unsigned int reserved = 1; | |
567 | unsigned int old; | |
568 | ||
569 | gfs2_log_lock(sdp); | |
570 | ||
571 | sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm; | |
572 | gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_buf) >= 0); | |
573 | sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm; | |
574 | gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0); | |
575 | ||
576 | if (sdp->sd_log_commited_buf) | |
577 | reserved += 1 + sdp->sd_log_commited_buf + sdp->sd_log_commited_buf/503; | |
578 | if (sdp->sd_log_commited_revoke) | |
579 | reserved += gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke, | |
580 | sizeof(uint64_t)); | |
581 | ||
582 | old = sdp->sd_log_blks_free; | |
583 | sdp->sd_log_blks_free += tr->tr_reserved - | |
584 | (reserved - sdp->sd_log_blks_reserved); | |
585 | ||
586 | gfs2_assert_withdraw(sdp, | |
587 | sdp->sd_log_blks_free >= old); | |
588 | gfs2_assert_withdraw(sdp, | |
589 | sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); | |
590 | ||
591 | sdp->sd_log_blks_reserved = reserved; | |
592 | ||
593 | gfs2_log_unlock(sdp); | |
594 | } | |
595 | ||
596 | /** | |
597 | * gfs2_log_commit - Commit a transaction to the log | |
598 | * @sdp: the filesystem | |
599 | * @tr: the transaction | |
600 | * | |
601 | * Returns: errno | |
602 | */ | |
603 | ||
604 | void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) | |
605 | { | |
606 | log_refund(sdp, tr); | |
607 | lops_incore_commit(sdp, tr); | |
608 | ||
609 | sdp->sd_vfs->s_dirt = 1; | |
610 | unlock_from_trans(sdp); | |
611 | ||
612 | kfree(tr); | |
613 | ||
614 | gfs2_log_lock(sdp); | |
615 | if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks)) { | |
616 | gfs2_log_unlock(sdp); | |
617 | gfs2_log_flush(sdp); | |
618 | } else | |
619 | gfs2_log_unlock(sdp); | |
620 | } | |
621 | ||
622 | /** | |
623 | * gfs2_log_shutdown - write a shutdown header into a journal | |
624 | * @sdp: the filesystem | |
625 | * | |
626 | */ | |
627 | ||
628 | void gfs2_log_shutdown(struct gfs2_sbd *sdp) | |
629 | { | |
630 | down(&sdp->sd_log_flush_lock); | |
631 | ||
632 | gfs2_assert_withdraw(sdp, !atomic_read(&sdp->sd_log_trans_count)); | |
633 | gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved); | |
634 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_gl); | |
635 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf); | |
18ec7d5c | 636 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_jdata); |
b3b94faa DT |
637 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); |
638 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg); | |
639 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf); | |
640 | gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list)); | |
641 | ||
642 | sdp->sd_log_flush_head = sdp->sd_log_head; | |
643 | sdp->sd_log_flush_wrapped = 0; | |
644 | ||
645 | log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT, 0); | |
646 | ||
647 | gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free == | |
648 | sdp->sd_jdesc->jd_blocks); | |
649 | gfs2_assert_withdraw(sdp, sdp->sd_log_head == sdp->sd_log_tail); | |
650 | gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail2_list)); | |
651 | ||
652 | sdp->sd_log_head = sdp->sd_log_flush_head; | |
653 | if (sdp->sd_log_flush_wrapped) | |
654 | sdp->sd_log_wraps++; | |
655 | sdp->sd_log_tail = sdp->sd_log_head; | |
656 | ||
657 | up(&sdp->sd_log_flush_lock); | |
658 | } | |
659 |