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 | ||
8fb68595 RP |
86 | if (!bh){ |
87 | list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); | |
88 | continue; | |
89 | } | |
90 | ||
ddacfaf7 SW |
91 | if (!buffer_busy(bh)) { |
92 | if (!buffer_uptodate(bh)) { | |
93 | gfs2_log_unlock(sdp); | |
94 | gfs2_io_error_bh(sdp, bh); | |
95 | gfs2_log_lock(sdp); | |
96 | } | |
97 | list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); | |
98 | continue; | |
99 | } | |
100 | ||
101 | if (!buffer_dirty(bh)) | |
102 | continue; | |
103 | ||
104 | list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list); | |
105 | ||
106 | gfs2_log_unlock(sdp); | |
107 | wait_on_buffer(bh); | |
108 | ll_rw_block(WRITE, 1, &bh); | |
109 | gfs2_log_lock(sdp); | |
110 | ||
111 | retry = 1; | |
112 | break; | |
113 | } | |
114 | } while (retry); | |
115 | } | |
116 | ||
117 | /** | |
118 | * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced | |
119 | * @sdp: the filesystem | |
120 | * @ai: the AIL entry | |
121 | * | |
122 | */ | |
123 | ||
124 | static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags) | |
125 | { | |
126 | struct gfs2_bufdata *bd, *s; | |
127 | struct buffer_head *bh; | |
128 | ||
129 | list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, | |
130 | bd_ail_st_list) { | |
131 | bh = bd->bd_bh; | |
132 | ||
8fb68595 RP |
133 | if (!bh){ |
134 | list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); | |
135 | continue; | |
136 | } | |
137 | ||
ddacfaf7 SW |
138 | gfs2_assert(sdp, bd->bd_ail == ai); |
139 | ||
140 | if (buffer_busy(bh)) { | |
141 | if (flags & DIO_ALL) | |
142 | continue; | |
143 | else | |
144 | break; | |
145 | } | |
146 | ||
147 | if (!buffer_uptodate(bh)) | |
148 | gfs2_io_error_bh(sdp, bh); | |
149 | ||
150 | list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); | |
151 | } | |
152 | ||
153 | return list_empty(&ai->ai_ail1_list); | |
154 | } | |
155 | ||
a25311c8 | 156 | static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags) |
b3b94faa DT |
157 | { |
158 | struct list_head *head = &sdp->sd_ail1_list; | |
cd915493 | 159 | u64 sync_gen; |
74669416 SW |
160 | struct list_head *first; |
161 | struct gfs2_ail *first_ai, *ai, *tmp; | |
162 | int done = 0; | |
b3b94faa DT |
163 | |
164 | gfs2_log_lock(sdp); | |
165 | if (list_empty(head)) { | |
166 | gfs2_log_unlock(sdp); | |
167 | return; | |
168 | } | |
169 | sync_gen = sdp->sd_ail_sync_gen++; | |
170 | ||
171 | first = head->prev; | |
172 | first_ai = list_entry(first, struct gfs2_ail, ai_list); | |
173 | first_ai->ai_sync_gen = sync_gen; | |
74669416 | 174 | gfs2_ail1_start_one(sdp, first_ai); /* This may drop log lock */ |
b3b94faa DT |
175 | |
176 | if (flags & DIO_ALL) | |
177 | first = NULL; | |
178 | ||
74669416 | 179 | while(!done) { |
484adff8 SW |
180 | if (first && (head->prev != first || |
181 | gfs2_ail1_empty_one(sdp, first_ai, 0))) | |
b3b94faa DT |
182 | break; |
183 | ||
74669416 SW |
184 | done = 1; |
185 | list_for_each_entry_safe_reverse(ai, tmp, head, ai_list) { | |
b3b94faa DT |
186 | if (ai->ai_sync_gen >= sync_gen) |
187 | continue; | |
188 | ai->ai_sync_gen = sync_gen; | |
74669416 SW |
189 | gfs2_ail1_start_one(sdp, ai); /* This may drop log lock */ |
190 | done = 0; | |
b3b94faa DT |
191 | break; |
192 | } | |
b3b94faa DT |
193 | } |
194 | ||
195 | gfs2_log_unlock(sdp); | |
196 | } | |
197 | ||
198 | int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags) | |
199 | { | |
200 | struct gfs2_ail *ai, *s; | |
201 | int ret; | |
202 | ||
203 | gfs2_log_lock(sdp); | |
204 | ||
205 | list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) { | |
206 | if (gfs2_ail1_empty_one(sdp, ai, flags)) | |
207 | list_move(&ai->ai_list, &sdp->sd_ail2_list); | |
208 | else if (!(flags & DIO_ALL)) | |
209 | break; | |
210 | } | |
211 | ||
212 | ret = list_empty(&sdp->sd_ail1_list); | |
213 | ||
214 | gfs2_log_unlock(sdp); | |
215 | ||
216 | return ret; | |
217 | } | |
218 | ||
ddacfaf7 SW |
219 | |
220 | /** | |
221 | * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced | |
222 | * @sdp: the filesystem | |
223 | * @ai: the AIL entry | |
224 | * | |
225 | */ | |
226 | ||
227 | static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) | |
228 | { | |
229 | struct list_head *head = &ai->ai_ail2_list; | |
230 | struct gfs2_bufdata *bd; | |
231 | ||
232 | while (!list_empty(head)) { | |
233 | bd = list_entry(head->prev, struct gfs2_bufdata, | |
234 | bd_ail_st_list); | |
235 | gfs2_assert(sdp, bd->bd_ail == ai); | |
236 | bd->bd_ail = NULL; | |
237 | list_del(&bd->bd_ail_st_list); | |
238 | list_del(&bd->bd_ail_gl_list); | |
239 | atomic_dec(&bd->bd_gl->gl_ail_count); | |
8fb68595 RP |
240 | if (bd->bd_bh) |
241 | brelse(bd->bd_bh); | |
242 | else | |
243 | kmem_cache_free(gfs2_bufdata_cachep, bd); | |
ddacfaf7 SW |
244 | } |
245 | } | |
246 | ||
b3b94faa DT |
247 | static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail) |
248 | { | |
249 | struct gfs2_ail *ai, *safe; | |
250 | unsigned int old_tail = sdp->sd_log_tail; | |
251 | int wrap = (new_tail < old_tail); | |
252 | int a, b, rm; | |
253 | ||
254 | gfs2_log_lock(sdp); | |
255 | ||
256 | list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) { | |
257 | a = (old_tail <= ai->ai_first); | |
258 | b = (ai->ai_first < new_tail); | |
259 | rm = (wrap) ? (a || b) : (a && b); | |
260 | if (!rm) | |
261 | continue; | |
262 | ||
263 | gfs2_ail2_empty_one(sdp, ai); | |
264 | list_del(&ai->ai_list); | |
265 | gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list)); | |
266 | gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list)); | |
267 | kfree(ai); | |
268 | } | |
269 | ||
270 | gfs2_log_unlock(sdp); | |
271 | } | |
272 | ||
273 | /** | |
274 | * gfs2_log_reserve - Make a log reservation | |
275 | * @sdp: The GFS2 superblock | |
276 | * @blks: The number of blocks to reserve | |
277 | * | |
89918647 | 278 | * Note that we never give out the last few blocks of the journal. Thats |
2332c443 | 279 | * due to the fact that there is a small number of header blocks |
b004157a SW |
280 | * associated with each log flush. The exact number can't be known until |
281 | * flush time, so we ensure that we have just enough free blocks at all | |
282 | * times to avoid running out during a log flush. | |
283 | * | |
b3b94faa DT |
284 | * Returns: errno |
285 | */ | |
286 | ||
287 | int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks) | |
288 | { | |
b3b94faa | 289 | unsigned int try = 0; |
89918647 | 290 | unsigned reserved_blks = 6 * (4096 / sdp->sd_vfs->s_blocksize); |
b3b94faa DT |
291 | |
292 | if (gfs2_assert_warn(sdp, blks) || | |
293 | gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks)) | |
294 | return -EINVAL; | |
295 | ||
71b86f56 | 296 | mutex_lock(&sdp->sd_log_reserve_mutex); |
484adff8 | 297 | gfs2_log_lock(sdp); |
89918647 | 298 | while(sdp->sd_log_blks_free <= (blks + reserved_blks)) { |
b3b94faa | 299 | gfs2_log_unlock(sdp); |
b3b94faa | 300 | gfs2_ail1_empty(sdp, 0); |
b09e593d | 301 | gfs2_log_flush(sdp, NULL); |
b3b94faa DT |
302 | |
303 | if (try++) | |
304 | gfs2_ail1_start(sdp, 0); | |
484adff8 | 305 | gfs2_log_lock(sdp); |
b3b94faa | 306 | } |
484adff8 SW |
307 | sdp->sd_log_blks_free -= blks; |
308 | gfs2_log_unlock(sdp); | |
309 | mutex_unlock(&sdp->sd_log_reserve_mutex); | |
310 | ||
311 | down_read(&sdp->sd_log_flush_lock); | |
b3b94faa DT |
312 | |
313 | return 0; | |
314 | } | |
315 | ||
316 | /** | |
317 | * gfs2_log_release - Release a given number of log blocks | |
318 | * @sdp: The GFS2 superblock | |
319 | * @blks: The number of blocks | |
320 | * | |
321 | */ | |
322 | ||
323 | void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks) | |
324 | { | |
b3b94faa DT |
325 | |
326 | gfs2_log_lock(sdp); | |
327 | sdp->sd_log_blks_free += blks; | |
328 | gfs2_assert_withdraw(sdp, | |
329 | sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); | |
330 | gfs2_log_unlock(sdp); | |
ed386507 | 331 | up_read(&sdp->sd_log_flush_lock); |
b3b94faa DT |
332 | } |
333 | ||
cd915493 | 334 | static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn) |
b3b94faa | 335 | { |
23591256 | 336 | struct inode *inode = sdp->sd_jdesc->jd_inode; |
b3b94faa | 337 | int error; |
23591256 | 338 | struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; |
b3b94faa | 339 | |
23591256 SW |
340 | bh_map.b_size = 1 << inode->i_blkbits; |
341 | error = gfs2_block_map(inode, lbn, 0, &bh_map); | |
7a6bbacb | 342 | if (error || !bh_map.b_blocknr) |
aed3255f RK |
343 | printk(KERN_INFO "error=%d, dbn=%llu lbn=%u", error, |
344 | (unsigned long long)bh_map.b_blocknr, lbn); | |
7a6bbacb | 345 | gfs2_assert_withdraw(sdp, !error && bh_map.b_blocknr); |
b3b94faa | 346 | |
7a6bbacb | 347 | return bh_map.b_blocknr; |
b3b94faa DT |
348 | } |
349 | ||
350 | /** | |
351 | * log_distance - Compute distance between two journal blocks | |
352 | * @sdp: The GFS2 superblock | |
353 | * @newer: The most recent journal block of the pair | |
354 | * @older: The older journal block of the pair | |
355 | * | |
356 | * Compute the distance (in the journal direction) between two | |
357 | * blocks in the journal | |
358 | * | |
359 | * Returns: the distance in blocks | |
360 | */ | |
361 | ||
faa31ce8 | 362 | static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer, |
b3b94faa DT |
363 | unsigned int older) |
364 | { | |
365 | int dist; | |
366 | ||
367 | dist = newer - older; | |
368 | if (dist < 0) | |
369 | dist += sdp->sd_jdesc->jd_blocks; | |
370 | ||
371 | return dist; | |
372 | } | |
373 | ||
2332c443 RP |
374 | /** |
375 | * calc_reserved - Calculate the number of blocks to reserve when | |
376 | * refunding a transaction's unused buffers. | |
377 | * @sdp: The GFS2 superblock | |
378 | * | |
379 | * This is complex. We need to reserve room for all our currently used | |
380 | * metadata buffers (e.g. normal file I/O rewriting file time stamps) and | |
381 | * all our journaled data buffers for journaled files (e.g. files in the | |
382 | * meta_fs like rindex, or files for which chattr +j was done.) | |
383 | * If we don't reserve enough space, gfs2_log_refund and gfs2_log_flush | |
384 | * will count it as free space (sd_log_blks_free) and corruption will follow. | |
385 | * | |
386 | * We can have metadata bufs and jdata bufs in the same journal. So each | |
387 | * type gets its own log header, for which we need to reserve a block. | |
388 | * In fact, each type has the potential for needing more than one header | |
389 | * in cases where we have more buffers than will fit on a journal page. | |
390 | * Metadata journal entries take up half the space of journaled buffer entries. | |
391 | * Thus, metadata entries have buf_limit (502) and journaled buffers have | |
392 | * databuf_limit (251) before they cause a wrap around. | |
393 | * | |
394 | * Also, we need to reserve blocks for revoke journal entries and one for an | |
395 | * overall header for the lot. | |
396 | * | |
397 | * Returns: the number of blocks reserved | |
398 | */ | |
399 | static unsigned int calc_reserved(struct gfs2_sbd *sdp) | |
400 | { | |
401 | unsigned int reserved = 0; | |
402 | unsigned int mbuf_limit, metabufhdrs_needed; | |
403 | unsigned int dbuf_limit, databufhdrs_needed; | |
404 | unsigned int revokes = 0; | |
405 | ||
406 | mbuf_limit = buf_limit(sdp); | |
407 | metabufhdrs_needed = (sdp->sd_log_commited_buf + | |
408 | (mbuf_limit - 1)) / mbuf_limit; | |
409 | dbuf_limit = databuf_limit(sdp); | |
410 | databufhdrs_needed = (sdp->sd_log_commited_databuf + | |
411 | (dbuf_limit - 1)) / dbuf_limit; | |
412 | ||
413 | if (sdp->sd_log_commited_revoke) | |
414 | revokes = gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke, | |
415 | sizeof(u64)); | |
416 | ||
417 | reserved = sdp->sd_log_commited_buf + metabufhdrs_needed + | |
418 | sdp->sd_log_commited_databuf + databufhdrs_needed + | |
419 | revokes; | |
420 | /* One for the overall header */ | |
421 | if (reserved) | |
422 | reserved++; | |
423 | return reserved; | |
424 | } | |
425 | ||
b3b94faa DT |
426 | static unsigned int current_tail(struct gfs2_sbd *sdp) |
427 | { | |
428 | struct gfs2_ail *ai; | |
429 | unsigned int tail; | |
430 | ||
431 | gfs2_log_lock(sdp); | |
432 | ||
faa31ce8 | 433 | if (list_empty(&sdp->sd_ail1_list)) { |
b3b94faa | 434 | tail = sdp->sd_log_head; |
faa31ce8 SW |
435 | } else { |
436 | ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail, ai_list); | |
b3b94faa DT |
437 | tail = ai->ai_first; |
438 | } | |
439 | ||
440 | gfs2_log_unlock(sdp); | |
441 | ||
442 | return tail; | |
443 | } | |
444 | ||
445 | static inline void log_incr_head(struct gfs2_sbd *sdp) | |
446 | { | |
447 | if (sdp->sd_log_flush_head == sdp->sd_log_tail) | |
faa31ce8 | 448 | gfs2_assert_withdraw(sdp, sdp->sd_log_flush_head == sdp->sd_log_head); |
b3b94faa DT |
449 | |
450 | if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) { | |
451 | sdp->sd_log_flush_head = 0; | |
452 | sdp->sd_log_flush_wrapped = 1; | |
453 | } | |
454 | } | |
455 | ||
456 | /** | |
457 | * gfs2_log_get_buf - Get and initialize a buffer to use for log control data | |
458 | * @sdp: The GFS2 superblock | |
459 | * | |
460 | * Returns: the buffer_head | |
461 | */ | |
462 | ||
463 | struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp) | |
464 | { | |
cd915493 | 465 | u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); |
b3b94faa DT |
466 | struct gfs2_log_buf *lb; |
467 | struct buffer_head *bh; | |
468 | ||
4f3df041 | 469 | lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
470 | list_add(&lb->lb_list, &sdp->sd_log_flush_list); |
471 | ||
472 | bh = lb->lb_bh = sb_getblk(sdp->sd_vfs, blkno); | |
473 | lock_buffer(bh); | |
474 | memset(bh->b_data, 0, bh->b_size); | |
475 | set_buffer_uptodate(bh); | |
476 | clear_buffer_dirty(bh); | |
477 | unlock_buffer(bh); | |
478 | ||
479 | log_incr_head(sdp); | |
480 | ||
481 | return bh; | |
482 | } | |
483 | ||
484 | /** | |
485 | * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log | |
486 | * @sdp: the filesystem | |
487 | * @data: the data the buffer_head should point to | |
488 | * | |
489 | * Returns: the log buffer descriptor | |
490 | */ | |
491 | ||
492 | struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp, | |
493 | struct buffer_head *real) | |
494 | { | |
cd915493 | 495 | u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); |
b3b94faa DT |
496 | struct gfs2_log_buf *lb; |
497 | struct buffer_head *bh; | |
498 | ||
4f3df041 | 499 | lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
500 | list_add(&lb->lb_list, &sdp->sd_log_flush_list); |
501 | lb->lb_real = real; | |
502 | ||
503 | bh = lb->lb_bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL); | |
504 | atomic_set(&bh->b_count, 1); | |
505 | bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate); | |
18ec7d5c | 506 | set_bh_page(bh, real->b_page, bh_offset(real)); |
b3b94faa DT |
507 | bh->b_blocknr = blkno; |
508 | bh->b_size = sdp->sd_sb.sb_bsize; | |
509 | bh->b_bdev = sdp->sd_vfs->s_bdev; | |
510 | ||
511 | log_incr_head(sdp); | |
512 | ||
513 | return bh; | |
514 | } | |
515 | ||
2332c443 | 516 | static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail) |
b3b94faa DT |
517 | { |
518 | unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail); | |
519 | ||
520 | ail2_empty(sdp, new_tail); | |
521 | ||
522 | gfs2_log_lock(sdp); | |
2332c443 | 523 | sdp->sd_log_blks_free += dist; |
faa31ce8 | 524 | gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); |
b3b94faa DT |
525 | gfs2_log_unlock(sdp); |
526 | ||
527 | sdp->sd_log_tail = new_tail; | |
528 | } | |
529 | ||
530 | /** | |
531 | * log_write_header - Get and initialize a journal header buffer | |
532 | * @sdp: The GFS2 superblock | |
533 | * | |
534 | * Returns: the initialized log buffer descriptor | |
535 | */ | |
536 | ||
cd915493 | 537 | static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull) |
b3b94faa | 538 | { |
cd915493 | 539 | u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); |
b3b94faa DT |
540 | struct buffer_head *bh; |
541 | struct gfs2_log_header *lh; | |
542 | unsigned int tail; | |
cd915493 | 543 | u32 hash; |
b3b94faa | 544 | |
b3b94faa DT |
545 | bh = sb_getblk(sdp->sd_vfs, blkno); |
546 | lock_buffer(bh); | |
547 | memset(bh->b_data, 0, bh->b_size); | |
548 | set_buffer_uptodate(bh); | |
549 | clear_buffer_dirty(bh); | |
550 | unlock_buffer(bh); | |
551 | ||
552 | gfs2_ail1_empty(sdp, 0); | |
553 | tail = current_tail(sdp); | |
554 | ||
555 | lh = (struct gfs2_log_header *)bh->b_data; | |
556 | memset(lh, 0, sizeof(struct gfs2_log_header)); | |
557 | lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC); | |
e3167ded SW |
558 | lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH); |
559 | lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH); | |
e0f2bf78 SW |
560 | lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++); |
561 | lh->lh_flags = cpu_to_be32(flags); | |
562 | lh->lh_tail = cpu_to_be32(tail); | |
563 | lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head); | |
b3b94faa DT |
564 | hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header)); |
565 | lh->lh_hash = cpu_to_be32(hash); | |
566 | ||
567 | set_buffer_dirty(bh); | |
568 | if (sync_dirty_buffer(bh)) | |
569 | gfs2_io_error_bh(sdp, bh); | |
570 | brelse(bh); | |
571 | ||
572 | if (sdp->sd_log_tail != tail) | |
2332c443 | 573 | log_pull_tail(sdp, tail); |
b3b94faa DT |
574 | else |
575 | gfs2_assert_withdraw(sdp, !pull); | |
576 | ||
577 | sdp->sd_log_idle = (tail == sdp->sd_log_flush_head); | |
578 | log_incr_head(sdp); | |
579 | } | |
580 | ||
581 | static void log_flush_commit(struct gfs2_sbd *sdp) | |
582 | { | |
583 | struct list_head *head = &sdp->sd_log_flush_list; | |
584 | struct gfs2_log_buf *lb; | |
585 | struct buffer_head *bh; | |
b3b94faa DT |
586 | |
587 | while (!list_empty(head)) { | |
588 | lb = list_entry(head->next, struct gfs2_log_buf, lb_list); | |
589 | list_del(&lb->lb_list); | |
590 | bh = lb->lb_bh; | |
591 | ||
592 | wait_on_buffer(bh); | |
593 | if (!buffer_uptodate(bh)) | |
594 | gfs2_io_error_bh(sdp, bh); | |
595 | if (lb->lb_real) { | |
596 | while (atomic_read(&bh->b_count) != 1) /* Grrrr... */ | |
597 | schedule(); | |
598 | free_buffer_head(bh); | |
599 | } else | |
600 | brelse(bh); | |
601 | kfree(lb); | |
602 | } | |
603 | ||
604 | log_write_header(sdp, 0, 0); | |
605 | } | |
606 | ||
607 | /** | |
b09e593d | 608 | * gfs2_log_flush - flush incore transaction(s) |
b3b94faa DT |
609 | * @sdp: the filesystem |
610 | * @gl: The glock structure to flush. If NULL, flush the whole incore log | |
611 | * | |
612 | */ | |
613 | ||
b09e593d | 614 | void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl) |
b3b94faa DT |
615 | { |
616 | struct gfs2_ail *ai; | |
617 | ||
484adff8 | 618 | down_write(&sdp->sd_log_flush_lock); |
f55ab26a SW |
619 | |
620 | if (gl) { | |
621 | gfs2_log_lock(sdp); | |
622 | if (list_empty(&gl->gl_le.le_list)) { | |
623 | gfs2_log_unlock(sdp); | |
484adff8 | 624 | up_write(&sdp->sd_log_flush_lock); |
f55ab26a SW |
625 | return; |
626 | } | |
627 | gfs2_log_unlock(sdp); | |
628 | } | |
629 | ||
b09e593d SW |
630 | ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL); |
631 | INIT_LIST_HEAD(&ai->ai_ail1_list); | |
632 | INIT_LIST_HEAD(&ai->ai_ail2_list); | |
b3b94faa | 633 | |
2332c443 RP |
634 | gfs2_assert_withdraw(sdp, |
635 | sdp->sd_log_num_buf + sdp->sd_log_num_jdata == | |
636 | sdp->sd_log_commited_buf + | |
637 | sdp->sd_log_commited_databuf); | |
b3b94faa DT |
638 | gfs2_assert_withdraw(sdp, |
639 | sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke); | |
640 | ||
b3b94faa DT |
641 | sdp->sd_log_flush_head = sdp->sd_log_head; |
642 | sdp->sd_log_flush_wrapped = 0; | |
643 | ai->ai_first = sdp->sd_log_flush_head; | |
644 | ||
645 | lops_before_commit(sdp); | |
646 | if (!list_empty(&sdp->sd_log_flush_list)) | |
647 | log_flush_commit(sdp); | |
2332c443 RP |
648 | else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){ |
649 | gfs2_log_lock(sdp); | |
650 | sdp->sd_log_blks_free--; /* Adjust for unreserved buffer */ | |
651 | gfs2_log_unlock(sdp); | |
b3b94faa | 652 | log_write_header(sdp, 0, PULL); |
2332c443 | 653 | } |
b3b94faa | 654 | lops_after_commit(sdp, ai); |
b09e593d | 655 | |
fe1a698f SW |
656 | gfs2_log_lock(sdp); |
657 | sdp->sd_log_head = sdp->sd_log_flush_head; | |
faa31ce8 SW |
658 | sdp->sd_log_blks_reserved = 0; |
659 | sdp->sd_log_commited_buf = 0; | |
2332c443 | 660 | sdp->sd_log_commited_databuf = 0; |
faa31ce8 | 661 | sdp->sd_log_commited_revoke = 0; |
b3b94faa | 662 | |
b3b94faa DT |
663 | if (!list_empty(&ai->ai_ail1_list)) { |
664 | list_add(&ai->ai_list, &sdp->sd_ail1_list); | |
665 | ai = NULL; | |
666 | } | |
667 | gfs2_log_unlock(sdp); | |
668 | ||
b3b94faa | 669 | sdp->sd_vfs->s_dirt = 0; |
484adff8 | 670 | up_write(&sdp->sd_log_flush_lock); |
b3b94faa DT |
671 | |
672 | kfree(ai); | |
673 | } | |
674 | ||
675 | static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr) | |
676 | { | |
2332c443 | 677 | unsigned int reserved; |
b3b94faa DT |
678 | unsigned int old; |
679 | ||
680 | gfs2_log_lock(sdp); | |
681 | ||
682 | sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm; | |
2332c443 RP |
683 | sdp->sd_log_commited_databuf += tr->tr_num_databuf_new - |
684 | tr->tr_num_databuf_rm; | |
685 | gfs2_assert_withdraw(sdp, (((int)sdp->sd_log_commited_buf) >= 0) || | |
686 | (((int)sdp->sd_log_commited_databuf) >= 0)); | |
b3b94faa DT |
687 | sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm; |
688 | gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0); | |
2332c443 | 689 | reserved = calc_reserved(sdp); |
b3b94faa DT |
690 | old = sdp->sd_log_blks_free; |
691 | sdp->sd_log_blks_free += tr->tr_reserved - | |
692 | (reserved - sdp->sd_log_blks_reserved); | |
693 | ||
b09e593d | 694 | gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free >= old); |
2332c443 RP |
695 | gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <= |
696 | sdp->sd_jdesc->jd_blocks); | |
b3b94faa DT |
697 | |
698 | sdp->sd_log_blks_reserved = reserved; | |
699 | ||
700 | gfs2_log_unlock(sdp); | |
701 | } | |
702 | ||
703 | /** | |
704 | * gfs2_log_commit - Commit a transaction to the log | |
705 | * @sdp: the filesystem | |
706 | * @tr: the transaction | |
707 | * | |
708 | * Returns: errno | |
709 | */ | |
710 | ||
711 | void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) | |
712 | { | |
713 | log_refund(sdp, tr); | |
714 | lops_incore_commit(sdp, tr); | |
715 | ||
716 | sdp->sd_vfs->s_dirt = 1; | |
484adff8 | 717 | up_read(&sdp->sd_log_flush_lock); |
b3b94faa | 718 | |
b3b94faa | 719 | gfs2_log_lock(sdp); |
b004157a SW |
720 | if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks)) |
721 | wake_up_process(sdp->sd_logd_process); | |
722 | gfs2_log_unlock(sdp); | |
b3b94faa DT |
723 | } |
724 | ||
725 | /** | |
726 | * gfs2_log_shutdown - write a shutdown header into a journal | |
727 | * @sdp: the filesystem | |
728 | * | |
729 | */ | |
730 | ||
731 | void gfs2_log_shutdown(struct gfs2_sbd *sdp) | |
732 | { | |
484adff8 | 733 | down_write(&sdp->sd_log_flush_lock); |
b3b94faa | 734 | |
b3b94faa DT |
735 | gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved); |
736 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_gl); | |
737 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf); | |
18ec7d5c | 738 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_jdata); |
b3b94faa DT |
739 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); |
740 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg); | |
741 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf); | |
742 | gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list)); | |
743 | ||
744 | sdp->sd_log_flush_head = sdp->sd_log_head; | |
745 | sdp->sd_log_flush_wrapped = 0; | |
746 | ||
2332c443 RP |
747 | log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT, |
748 | (sdp->sd_log_tail == current_tail(sdp)) ? 0 : PULL); | |
b3b94faa | 749 | |
a74604be SW |
750 | gfs2_assert_warn(sdp, sdp->sd_log_blks_free == sdp->sd_jdesc->jd_blocks); |
751 | gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail); | |
752 | gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list)); | |
b3b94faa DT |
753 | |
754 | sdp->sd_log_head = sdp->sd_log_flush_head; | |
b3b94faa DT |
755 | sdp->sd_log_tail = sdp->sd_log_head; |
756 | ||
484adff8 | 757 | up_write(&sdp->sd_log_flush_lock); |
b3b94faa DT |
758 | } |
759 | ||
a25311c8 SW |
760 | |
761 | /** | |
762 | * gfs2_meta_syncfs - sync all the buffers in a filesystem | |
763 | * @sdp: the filesystem | |
764 | * | |
765 | */ | |
766 | ||
767 | void gfs2_meta_syncfs(struct gfs2_sbd *sdp) | |
768 | { | |
769 | gfs2_log_flush(sdp, NULL); | |
770 | for (;;) { | |
771 | gfs2_ail1_start(sdp, DIO_ALL); | |
772 | if (gfs2_ail1_empty(sdp, DIO_ALL)) | |
773 | break; | |
774 | msleep(10); | |
775 | } | |
776 | } | |
777 |