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