]>
Commit | Line | Data |
---|---|---|
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> |
b3b94faa DT |
16 | #include <asm/semaphore.h> |
17 | ||
18 | #include "gfs2.h" | |
5c676f6d SW |
19 | #include "lm_interface.h" |
20 | #include "incore.h" | |
b3b94faa DT |
21 | #include "bmap.h" |
22 | #include "glock.h" | |
23 | #include "log.h" | |
24 | #include "lops.h" | |
25 | #include "meta_io.h" | |
5c676f6d | 26 | #include "util.h" |
b3b94faa DT |
27 | |
28 | #define PULL 1 | |
29 | ||
b3b94faa DT |
30 | static void do_lock_wait(struct gfs2_sbd *sdp, wait_queue_head_t *wq, |
31 | atomic_t *a) | |
32 | { | |
f55ab26a | 33 | wait_event(*wq, atomic_read(a) ? 0 : 1); |
b3b94faa DT |
34 | } |
35 | ||
36 | static void lock_for_trans(struct gfs2_sbd *sdp) | |
37 | { | |
b3b94faa DT |
38 | do_lock_wait(sdp, &sdp->sd_log_trans_wq, &sdp->sd_log_flush_count); |
39 | atomic_inc(&sdp->sd_log_trans_count); | |
b3b94faa DT |
40 | } |
41 | ||
42 | static void unlock_from_trans(struct gfs2_sbd *sdp) | |
43 | { | |
44 | gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_trans_count)); | |
45 | if (atomic_dec_and_test(&sdp->sd_log_trans_count)) | |
46 | wake_up(&sdp->sd_log_flush_wq); | |
47 | } | |
48 | ||
f55ab26a | 49 | static void gfs2_lock_for_flush(struct gfs2_sbd *sdp) |
b3b94faa | 50 | { |
b3b94faa DT |
51 | atomic_inc(&sdp->sd_log_flush_count); |
52 | do_lock_wait(sdp, &sdp->sd_log_flush_wq, &sdp->sd_log_trans_count); | |
b3b94faa DT |
53 | } |
54 | ||
f55ab26a | 55 | static void gfs2_unlock_from_flush(struct gfs2_sbd *sdp) |
b3b94faa DT |
56 | { |
57 | gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_flush_count)); | |
58 | if (atomic_dec_and_test(&sdp->sd_log_flush_count)) | |
59 | wake_up(&sdp->sd_log_trans_wq); | |
60 | } | |
61 | ||
62 | /** | |
63 | * gfs2_struct2blk - compute stuff | |
64 | * @sdp: the filesystem | |
65 | * @nstruct: the number of structures | |
66 | * @ssize: the size of the structures | |
67 | * | |
68 | * Compute the number of log descriptor blocks needed to hold a certain number | |
69 | * of structures of a certain size. | |
70 | * | |
71 | * Returns: the number of blocks needed (minimum is always 1) | |
72 | */ | |
73 | ||
74 | unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct, | |
75 | unsigned int ssize) | |
76 | { | |
77 | unsigned int blks; | |
78 | unsigned int first, second; | |
79 | ||
80 | blks = 1; | |
568f4c96 SW |
81 | first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / |
82 | ssize; | |
b3b94faa DT |
83 | |
84 | if (nstruct > first) { | |
568f4c96 SW |
85 | second = (sdp->sd_sb.sb_bsize - |
86 | sizeof(struct gfs2_meta_header)) / ssize; | |
5c676f6d | 87 | blks += DIV_ROUND_UP(nstruct - first, second); |
b3b94faa DT |
88 | } |
89 | ||
90 | return blks; | |
91 | } | |
92 | ||
93 | void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags) | |
94 | { | |
95 | struct list_head *head = &sdp->sd_ail1_list; | |
96 | uint64_t sync_gen; | |
97 | struct list_head *first, *tmp; | |
98 | struct gfs2_ail *first_ai, *ai; | |
99 | ||
100 | gfs2_log_lock(sdp); | |
101 | if (list_empty(head)) { | |
102 | gfs2_log_unlock(sdp); | |
103 | return; | |
104 | } | |
105 | sync_gen = sdp->sd_ail_sync_gen++; | |
106 | ||
107 | first = head->prev; | |
108 | first_ai = list_entry(first, struct gfs2_ail, ai_list); | |
109 | first_ai->ai_sync_gen = sync_gen; | |
110 | gfs2_ail1_start_one(sdp, first_ai); | |
111 | ||
112 | if (flags & DIO_ALL) | |
113 | first = NULL; | |
114 | ||
115 | for (;;) { | |
116 | if (first && | |
117 | (head->prev != first || | |
118 | gfs2_ail1_empty_one(sdp, first_ai, 0))) | |
119 | break; | |
120 | ||
121 | for (tmp = head->prev; tmp != head; tmp = tmp->prev) { | |
122 | ai = list_entry(tmp, struct gfs2_ail, ai_list); | |
123 | if (ai->ai_sync_gen >= sync_gen) | |
124 | continue; | |
125 | ai->ai_sync_gen = sync_gen; | |
126 | gfs2_ail1_start_one(sdp, ai); | |
127 | break; | |
128 | } | |
129 | ||
130 | if (tmp == head) | |
131 | break; | |
132 | } | |
133 | ||
134 | gfs2_log_unlock(sdp); | |
135 | } | |
136 | ||
137 | int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags) | |
138 | { | |
139 | struct gfs2_ail *ai, *s; | |
140 | int ret; | |
141 | ||
142 | gfs2_log_lock(sdp); | |
143 | ||
144 | list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) { | |
145 | if (gfs2_ail1_empty_one(sdp, ai, flags)) | |
146 | list_move(&ai->ai_list, &sdp->sd_ail2_list); | |
147 | else if (!(flags & DIO_ALL)) | |
148 | break; | |
149 | } | |
150 | ||
151 | ret = list_empty(&sdp->sd_ail1_list); | |
152 | ||
153 | gfs2_log_unlock(sdp); | |
154 | ||
155 | return ret; | |
156 | } | |
157 | ||
158 | static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail) | |
159 | { | |
160 | struct gfs2_ail *ai, *safe; | |
161 | unsigned int old_tail = sdp->sd_log_tail; | |
162 | int wrap = (new_tail < old_tail); | |
163 | int a, b, rm; | |
164 | ||
165 | gfs2_log_lock(sdp); | |
166 | ||
167 | list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) { | |
168 | a = (old_tail <= ai->ai_first); | |
169 | b = (ai->ai_first < new_tail); | |
170 | rm = (wrap) ? (a || b) : (a && b); | |
171 | if (!rm) | |
172 | continue; | |
173 | ||
174 | gfs2_ail2_empty_one(sdp, ai); | |
175 | list_del(&ai->ai_list); | |
176 | gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list)); | |
177 | gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list)); | |
178 | kfree(ai); | |
179 | } | |
180 | ||
181 | gfs2_log_unlock(sdp); | |
182 | } | |
183 | ||
184 | /** | |
185 | * gfs2_log_reserve - Make a log reservation | |
186 | * @sdp: The GFS2 superblock | |
187 | * @blks: The number of blocks to reserve | |
188 | * | |
189 | * Returns: errno | |
190 | */ | |
191 | ||
192 | int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks) | |
193 | { | |
194 | LIST_HEAD(list); | |
195 | unsigned int try = 0; | |
196 | ||
197 | if (gfs2_assert_warn(sdp, blks) || | |
198 | gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks)) | |
199 | return -EINVAL; | |
200 | ||
201 | for (;;) { | |
202 | gfs2_log_lock(sdp); | |
b3b94faa DT |
203 | if (list_empty(&list)) { |
204 | list_add_tail(&list, &sdp->sd_log_blks_list); | |
205 | while (sdp->sd_log_blks_list.next != &list) { | |
206 | DECLARE_WAITQUEUE(__wait_chan, current); | |
207 | set_current_state(TASK_UNINTERRUPTIBLE); | |
208 | add_wait_queue(&sdp->sd_log_blks_wait, | |
209 | &__wait_chan); | |
210 | gfs2_log_unlock(sdp); | |
211 | schedule(); | |
212 | gfs2_log_lock(sdp); | |
213 | remove_wait_queue(&sdp->sd_log_blks_wait, | |
214 | &__wait_chan); | |
215 | set_current_state(TASK_RUNNING); | |
216 | } | |
217 | } | |
b3b94faa DT |
218 | /* Never give away the last block so we can |
219 | always pull the tail if we need to. */ | |
220 | if (sdp->sd_log_blks_free > blks) { | |
221 | sdp->sd_log_blks_free -= blks; | |
222 | list_del(&list); | |
223 | gfs2_log_unlock(sdp); | |
224 | wake_up(&sdp->sd_log_blks_wait); | |
225 | break; | |
226 | } | |
227 | ||
228 | gfs2_log_unlock(sdp); | |
b3b94faa DT |
229 | gfs2_ail1_empty(sdp, 0); |
230 | gfs2_log_flush(sdp); | |
231 | ||
232 | if (try++) | |
233 | gfs2_ail1_start(sdp, 0); | |
234 | } | |
b3b94faa DT |
235 | lock_for_trans(sdp); |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | /** | |
241 | * gfs2_log_release - Release a given number of log blocks | |
242 | * @sdp: The GFS2 superblock | |
243 | * @blks: The number of blocks | |
244 | * | |
245 | */ | |
246 | ||
247 | void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks) | |
248 | { | |
249 | unlock_from_trans(sdp); | |
250 | ||
251 | gfs2_log_lock(sdp); | |
252 | sdp->sd_log_blks_free += blks; | |
253 | gfs2_assert_withdraw(sdp, | |
254 | sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); | |
255 | gfs2_log_unlock(sdp); | |
256 | } | |
257 | ||
258 | static uint64_t log_bmap(struct gfs2_sbd *sdp, unsigned int lbn) | |
259 | { | |
260 | int new = 0; | |
261 | uint64_t dbn; | |
262 | int error; | |
263 | ||
5c676f6d | 264 | error = gfs2_block_map(sdp->sd_jdesc->jd_inode->u.generic_ip, |
568f4c96 | 265 | lbn, &new, &dbn, NULL); |
b3b94faa DT |
266 | gfs2_assert_withdraw(sdp, !error && dbn); |
267 | ||
268 | return dbn; | |
269 | } | |
270 | ||
271 | /** | |
272 | * log_distance - Compute distance between two journal blocks | |
273 | * @sdp: The GFS2 superblock | |
274 | * @newer: The most recent journal block of the pair | |
275 | * @older: The older journal block of the pair | |
276 | * | |
277 | * Compute the distance (in the journal direction) between two | |
278 | * blocks in the journal | |
279 | * | |
280 | * Returns: the distance in blocks | |
281 | */ | |
282 | ||
283 | static inline unsigned int log_distance(struct gfs2_sbd *sdp, | |
284 | unsigned int newer, | |
285 | unsigned int older) | |
286 | { | |
287 | int dist; | |
288 | ||
289 | dist = newer - older; | |
290 | if (dist < 0) | |
291 | dist += sdp->sd_jdesc->jd_blocks; | |
292 | ||
293 | return dist; | |
294 | } | |
295 | ||
296 | static unsigned int current_tail(struct gfs2_sbd *sdp) | |
297 | { | |
298 | struct gfs2_ail *ai; | |
299 | unsigned int tail; | |
300 | ||
301 | gfs2_log_lock(sdp); | |
302 | ||
303 | if (list_empty(&sdp->sd_ail1_list)) | |
304 | tail = sdp->sd_log_head; | |
305 | else { | |
306 | ai = list_entry(sdp->sd_ail1_list.prev, | |
307 | struct gfs2_ail, ai_list); | |
308 | tail = ai->ai_first; | |
309 | } | |
310 | ||
311 | gfs2_log_unlock(sdp); | |
312 | ||
313 | return tail; | |
314 | } | |
315 | ||
316 | static inline void log_incr_head(struct gfs2_sbd *sdp) | |
317 | { | |
318 | if (sdp->sd_log_flush_head == sdp->sd_log_tail) | |
319 | gfs2_assert_withdraw(sdp, | |
320 | sdp->sd_log_flush_head == sdp->sd_log_head); | |
321 | ||
322 | if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) { | |
323 | sdp->sd_log_flush_head = 0; | |
324 | sdp->sd_log_flush_wrapped = 1; | |
325 | } | |
326 | } | |
327 | ||
328 | /** | |
329 | * gfs2_log_get_buf - Get and initialize a buffer to use for log control data | |
330 | * @sdp: The GFS2 superblock | |
331 | * | |
332 | * Returns: the buffer_head | |
333 | */ | |
334 | ||
335 | struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp) | |
336 | { | |
337 | uint64_t blkno = log_bmap(sdp, sdp->sd_log_flush_head); | |
338 | struct gfs2_log_buf *lb; | |
339 | struct buffer_head *bh; | |
340 | ||
4f3df041 | 341 | lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
342 | list_add(&lb->lb_list, &sdp->sd_log_flush_list); |
343 | ||
344 | bh = lb->lb_bh = sb_getblk(sdp->sd_vfs, blkno); | |
345 | lock_buffer(bh); | |
346 | memset(bh->b_data, 0, bh->b_size); | |
347 | set_buffer_uptodate(bh); | |
348 | clear_buffer_dirty(bh); | |
349 | unlock_buffer(bh); | |
350 | ||
351 | log_incr_head(sdp); | |
352 | ||
353 | return bh; | |
354 | } | |
355 | ||
356 | /** | |
357 | * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log | |
358 | * @sdp: the filesystem | |
359 | * @data: the data the buffer_head should point to | |
360 | * | |
361 | * Returns: the log buffer descriptor | |
362 | */ | |
363 | ||
364 | struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp, | |
365 | struct buffer_head *real) | |
366 | { | |
367 | uint64_t blkno = log_bmap(sdp, sdp->sd_log_flush_head); | |
368 | struct gfs2_log_buf *lb; | |
369 | struct buffer_head *bh; | |
370 | ||
4f3df041 | 371 | lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
372 | list_add(&lb->lb_list, &sdp->sd_log_flush_list); |
373 | lb->lb_real = real; | |
374 | ||
375 | bh = lb->lb_bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL); | |
376 | atomic_set(&bh->b_count, 1); | |
377 | bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate); | |
18ec7d5c | 378 | set_bh_page(bh, real->b_page, bh_offset(real)); |
b3b94faa DT |
379 | bh->b_blocknr = blkno; |
380 | bh->b_size = sdp->sd_sb.sb_bsize; | |
381 | bh->b_bdev = sdp->sd_vfs->s_bdev; | |
382 | ||
383 | log_incr_head(sdp); | |
384 | ||
385 | return bh; | |
386 | } | |
387 | ||
388 | static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail, int pull) | |
389 | { | |
390 | unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail); | |
391 | ||
392 | ail2_empty(sdp, new_tail); | |
393 | ||
394 | gfs2_log_lock(sdp); | |
395 | sdp->sd_log_blks_free += dist - ((pull) ? 1 : 0); | |
396 | gfs2_assert_withdraw(sdp, | |
397 | sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); | |
398 | gfs2_log_unlock(sdp); | |
399 | ||
400 | sdp->sd_log_tail = new_tail; | |
401 | } | |
402 | ||
403 | /** | |
404 | * log_write_header - Get and initialize a journal header buffer | |
405 | * @sdp: The GFS2 superblock | |
406 | * | |
407 | * Returns: the initialized log buffer descriptor | |
408 | */ | |
409 | ||
410 | static void log_write_header(struct gfs2_sbd *sdp, uint32_t flags, int pull) | |
411 | { | |
412 | uint64_t blkno = log_bmap(sdp, sdp->sd_log_flush_head); | |
413 | struct buffer_head *bh; | |
414 | struct gfs2_log_header *lh; | |
415 | unsigned int tail; | |
416 | uint32_t hash; | |
417 | ||
b3b94faa DT |
418 | bh = sb_getblk(sdp->sd_vfs, blkno); |
419 | lock_buffer(bh); | |
420 | memset(bh->b_data, 0, bh->b_size); | |
421 | set_buffer_uptodate(bh); | |
422 | clear_buffer_dirty(bh); | |
423 | unlock_buffer(bh); | |
424 | ||
425 | gfs2_ail1_empty(sdp, 0); | |
426 | tail = current_tail(sdp); | |
427 | ||
428 | lh = (struct gfs2_log_header *)bh->b_data; | |
429 | memset(lh, 0, sizeof(struct gfs2_log_header)); | |
430 | lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC); | |
431 | lh->lh_header.mh_type = cpu_to_be16(GFS2_METATYPE_LH); | |
432 | lh->lh_header.mh_format = cpu_to_be16(GFS2_FORMAT_LH); | |
433 | lh->lh_sequence = be64_to_cpu(sdp->sd_log_sequence++); | |
434 | lh->lh_flags = be32_to_cpu(flags); | |
435 | lh->lh_tail = be32_to_cpu(tail); | |
436 | lh->lh_blkno = be32_to_cpu(sdp->sd_log_flush_head); | |
437 | hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header)); | |
438 | lh->lh_hash = cpu_to_be32(hash); | |
439 | ||
440 | set_buffer_dirty(bh); | |
441 | if (sync_dirty_buffer(bh)) | |
442 | gfs2_io_error_bh(sdp, bh); | |
443 | brelse(bh); | |
444 | ||
445 | if (sdp->sd_log_tail != tail) | |
446 | log_pull_tail(sdp, tail, pull); | |
447 | else | |
448 | gfs2_assert_withdraw(sdp, !pull); | |
449 | ||
450 | sdp->sd_log_idle = (tail == sdp->sd_log_flush_head); | |
451 | log_incr_head(sdp); | |
452 | } | |
453 | ||
454 | static void log_flush_commit(struct gfs2_sbd *sdp) | |
455 | { | |
456 | struct list_head *head = &sdp->sd_log_flush_list; | |
457 | struct gfs2_log_buf *lb; | |
458 | struct buffer_head *bh; | |
459 | unsigned int d; | |
460 | ||
461 | d = log_distance(sdp, sdp->sd_log_flush_head, sdp->sd_log_head); | |
462 | ||
463 | gfs2_assert_withdraw(sdp, d + 1 == sdp->sd_log_blks_reserved); | |
464 | ||
465 | while (!list_empty(head)) { | |
466 | lb = list_entry(head->next, struct gfs2_log_buf, lb_list); | |
467 | list_del(&lb->lb_list); | |
468 | bh = lb->lb_bh; | |
469 | ||
470 | wait_on_buffer(bh); | |
471 | if (!buffer_uptodate(bh)) | |
472 | gfs2_io_error_bh(sdp, bh); | |
473 | if (lb->lb_real) { | |
474 | while (atomic_read(&bh->b_count) != 1) /* Grrrr... */ | |
475 | schedule(); | |
476 | free_buffer_head(bh); | |
477 | } else | |
478 | brelse(bh); | |
479 | kfree(lb); | |
480 | } | |
481 | ||
482 | log_write_header(sdp, 0, 0); | |
483 | } | |
484 | ||
485 | /** | |
486 | * gfs2_log_flush_i - flush incore transaction(s) | |
487 | * @sdp: the filesystem | |
488 | * @gl: The glock structure to flush. If NULL, flush the whole incore log | |
489 | * | |
490 | */ | |
491 | ||
492 | void gfs2_log_flush_i(struct gfs2_sbd *sdp, struct gfs2_glock *gl) | |
493 | { | |
494 | struct gfs2_ail *ai; | |
495 | ||
4f3df041 | 496 | ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
497 | INIT_LIST_HEAD(&ai->ai_ail1_list); |
498 | INIT_LIST_HEAD(&ai->ai_ail2_list); | |
b3b94faa | 499 | gfs2_lock_for_flush(sdp); |
f55ab26a SW |
500 | |
501 | if (gl) { | |
502 | gfs2_log_lock(sdp); | |
503 | if (list_empty(&gl->gl_le.le_list)) { | |
504 | gfs2_log_unlock(sdp); | |
505 | gfs2_unlock_from_flush(sdp); | |
506 | kfree(ai); | |
507 | return; | |
508 | } | |
509 | gfs2_log_unlock(sdp); | |
510 | } | |
511 | ||
512 | mutex_lock(&sdp->sd_log_flush_lock); | |
b3b94faa DT |
513 | |
514 | gfs2_assert_withdraw(sdp, | |
515 | sdp->sd_log_num_buf == sdp->sd_log_commited_buf); | |
516 | gfs2_assert_withdraw(sdp, | |
517 | sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke); | |
518 | ||
b3b94faa DT |
519 | sdp->sd_log_flush_head = sdp->sd_log_head; |
520 | sdp->sd_log_flush_wrapped = 0; | |
521 | ai->ai_first = sdp->sd_log_flush_head; | |
522 | ||
523 | lops_before_commit(sdp); | |
524 | if (!list_empty(&sdp->sd_log_flush_list)) | |
525 | log_flush_commit(sdp); | |
526 | else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle) | |
527 | log_write_header(sdp, 0, PULL); | |
528 | lops_after_commit(sdp, ai); | |
b3b94faa DT |
529 | sdp->sd_log_head = sdp->sd_log_flush_head; |
530 | if (sdp->sd_log_flush_wrapped) | |
531 | sdp->sd_log_wraps++; | |
532 | ||
533 | sdp->sd_log_blks_reserved = | |
534 | sdp->sd_log_commited_buf = | |
535 | sdp->sd_log_commited_revoke = 0; | |
536 | ||
537 | gfs2_log_lock(sdp); | |
538 | if (!list_empty(&ai->ai_ail1_list)) { | |
539 | list_add(&ai->ai_list, &sdp->sd_ail1_list); | |
540 | ai = NULL; | |
541 | } | |
542 | gfs2_log_unlock(sdp); | |
543 | ||
f55ab26a | 544 | mutex_unlock(&sdp->sd_log_flush_lock); |
b3b94faa DT |
545 | sdp->sd_vfs->s_dirt = 0; |
546 | gfs2_unlock_from_flush(sdp); | |
547 | ||
548 | kfree(ai); | |
549 | } | |
550 | ||
551 | static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr) | |
552 | { | |
553 | unsigned int reserved = 1; | |
554 | unsigned int old; | |
555 | ||
556 | gfs2_log_lock(sdp); | |
557 | ||
558 | sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm; | |
559 | gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_buf) >= 0); | |
560 | sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm; | |
561 | gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0); | |
562 | ||
563 | if (sdp->sd_log_commited_buf) | |
568f4c96 SW |
564 | reserved += 1 + sdp->sd_log_commited_buf + |
565 | sdp->sd_log_commited_buf/503; | |
b3b94faa DT |
566 | if (sdp->sd_log_commited_revoke) |
567 | reserved += gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke, | |
568 | sizeof(uint64_t)); | |
569 | ||
570 | old = sdp->sd_log_blks_free; | |
571 | sdp->sd_log_blks_free += tr->tr_reserved - | |
572 | (reserved - sdp->sd_log_blks_reserved); | |
573 | ||
574 | gfs2_assert_withdraw(sdp, | |
575 | sdp->sd_log_blks_free >= old); | |
576 | gfs2_assert_withdraw(sdp, | |
577 | sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); | |
578 | ||
579 | sdp->sd_log_blks_reserved = reserved; | |
580 | ||
581 | gfs2_log_unlock(sdp); | |
582 | } | |
583 | ||
584 | /** | |
585 | * gfs2_log_commit - Commit a transaction to the log | |
586 | * @sdp: the filesystem | |
587 | * @tr: the transaction | |
588 | * | |
589 | * Returns: errno | |
590 | */ | |
591 | ||
592 | void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) | |
593 | { | |
594 | log_refund(sdp, tr); | |
595 | lops_incore_commit(sdp, tr); | |
596 | ||
597 | sdp->sd_vfs->s_dirt = 1; | |
598 | unlock_from_trans(sdp); | |
599 | ||
b3b94faa DT |
600 | gfs2_log_lock(sdp); |
601 | if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks)) { | |
602 | gfs2_log_unlock(sdp); | |
603 | gfs2_log_flush(sdp); | |
604 | } else | |
605 | gfs2_log_unlock(sdp); | |
606 | } | |
607 | ||
608 | /** | |
609 | * gfs2_log_shutdown - write a shutdown header into a journal | |
610 | * @sdp: the filesystem | |
611 | * | |
612 | */ | |
613 | ||
614 | void gfs2_log_shutdown(struct gfs2_sbd *sdp) | |
615 | { | |
f55ab26a | 616 | mutex_lock(&sdp->sd_log_flush_lock); |
b3b94faa DT |
617 | |
618 | gfs2_assert_withdraw(sdp, !atomic_read(&sdp->sd_log_trans_count)); | |
619 | gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved); | |
620 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_gl); | |
621 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf); | |
18ec7d5c | 622 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_jdata); |
b3b94faa DT |
623 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); |
624 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg); | |
625 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf); | |
626 | gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list)); | |
627 | ||
628 | sdp->sd_log_flush_head = sdp->sd_log_head; | |
629 | sdp->sd_log_flush_wrapped = 0; | |
630 | ||
631 | log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT, 0); | |
632 | ||
633 | gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free == | |
634 | sdp->sd_jdesc->jd_blocks); | |
635 | gfs2_assert_withdraw(sdp, sdp->sd_log_head == sdp->sd_log_tail); | |
636 | gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail2_list)); | |
637 | ||
638 | sdp->sd_log_head = sdp->sd_log_flush_head; | |
639 | if (sdp->sd_log_flush_wrapped) | |
640 | sdp->sd_log_wraps++; | |
641 | sdp->sd_log_tail = sdp->sd_log_head; | |
642 | ||
f55ab26a | 643 | mutex_unlock(&sdp->sd_log_flush_lock); |
b3b94faa DT |
644 | } |
645 |