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 | ||
1e1a3d03 SW |
62 | /** |
63 | * gfs2_remove_from_ail - Remove an entry from the ail lists, updating counters | |
64 | * @mapping: The associated mapping (maybe NULL) | |
65 | * @bd: The gfs2_bufdata to remove | |
66 | * | |
67 | * The log lock _must_ be held when calling this function | |
68 | * | |
69 | */ | |
70 | ||
71 | void gfs2_remove_from_ail(struct address_space *mapping, struct gfs2_bufdata *bd) | |
72 | { | |
73 | bd->bd_ail = NULL; | |
74 | list_del(&bd->bd_ail_st_list); | |
75 | list_del(&bd->bd_ail_gl_list); | |
76 | atomic_dec(&bd->bd_gl->gl_ail_count); | |
77 | if (mapping) | |
78 | gfs2_meta_cache_flush(GFS2_I(mapping->host)); | |
79 | brelse(bd->bd_bh); | |
80 | } | |
81 | ||
ddacfaf7 SW |
82 | /** |
83 | * gfs2_ail1_start_one - Start I/O on a part of the AIL | |
84 | * @sdp: the filesystem | |
85 | * @tr: the part of the AIL | |
86 | * | |
87 | */ | |
88 | ||
89 | static void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) | |
90 | { | |
91 | struct gfs2_bufdata *bd, *s; | |
92 | struct buffer_head *bh; | |
93 | int retry; | |
94 | ||
95 | BUG_ON(!spin_is_locked(&sdp->sd_log_lock)); | |
96 | ||
97 | do { | |
98 | retry = 0; | |
99 | ||
100 | list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, | |
101 | bd_ail_st_list) { | |
102 | bh = bd->bd_bh; | |
103 | ||
104 | gfs2_assert(sdp, bd->bd_ail == ai); | |
105 | ||
106 | if (!buffer_busy(bh)) { | |
107 | if (!buffer_uptodate(bh)) { | |
108 | gfs2_log_unlock(sdp); | |
109 | gfs2_io_error_bh(sdp, bh); | |
110 | gfs2_log_lock(sdp); | |
111 | } | |
112 | list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); | |
113 | continue; | |
114 | } | |
115 | ||
116 | if (!buffer_dirty(bh)) | |
117 | continue; | |
118 | ||
119 | list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list); | |
120 | ||
121 | gfs2_log_unlock(sdp); | |
122 | wait_on_buffer(bh); | |
123 | ll_rw_block(WRITE, 1, &bh); | |
124 | gfs2_log_lock(sdp); | |
125 | ||
126 | retry = 1; | |
127 | break; | |
128 | } | |
129 | } while (retry); | |
130 | } | |
131 | ||
132 | /** | |
133 | * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced | |
134 | * @sdp: the filesystem | |
135 | * @ai: the AIL entry | |
136 | * | |
137 | */ | |
138 | ||
139 | static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags) | |
140 | { | |
141 | struct gfs2_bufdata *bd, *s; | |
142 | struct buffer_head *bh; | |
143 | ||
144 | list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, | |
145 | bd_ail_st_list) { | |
146 | bh = bd->bd_bh; | |
147 | ||
148 | gfs2_assert(sdp, bd->bd_ail == ai); | |
149 | ||
150 | if (buffer_busy(bh)) { | |
151 | if (flags & DIO_ALL) | |
152 | continue; | |
153 | else | |
154 | break; | |
155 | } | |
156 | ||
157 | if (!buffer_uptodate(bh)) | |
158 | gfs2_io_error_bh(sdp, bh); | |
159 | ||
160 | list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); | |
161 | } | |
162 | ||
163 | return list_empty(&ai->ai_ail1_list); | |
164 | } | |
165 | ||
a25311c8 | 166 | static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags) |
b3b94faa | 167 | { |
693ddeab | 168 | struct list_head *head; |
cd915493 | 169 | u64 sync_gen; |
74669416 SW |
170 | struct list_head *first; |
171 | struct gfs2_ail *first_ai, *ai, *tmp; | |
172 | int done = 0; | |
b3b94faa DT |
173 | |
174 | gfs2_log_lock(sdp); | |
693ddeab | 175 | head = &sdp->sd_ail1_list; |
b3b94faa DT |
176 | if (list_empty(head)) { |
177 | gfs2_log_unlock(sdp); | |
178 | return; | |
179 | } | |
180 | sync_gen = sdp->sd_ail_sync_gen++; | |
181 | ||
182 | first = head->prev; | |
183 | first_ai = list_entry(first, struct gfs2_ail, ai_list); | |
184 | first_ai->ai_sync_gen = sync_gen; | |
74669416 | 185 | gfs2_ail1_start_one(sdp, first_ai); /* This may drop log lock */ |
b3b94faa DT |
186 | |
187 | if (flags & DIO_ALL) | |
188 | first = NULL; | |
189 | ||
74669416 | 190 | while(!done) { |
484adff8 SW |
191 | if (first && (head->prev != first || |
192 | gfs2_ail1_empty_one(sdp, first_ai, 0))) | |
b3b94faa DT |
193 | break; |
194 | ||
74669416 SW |
195 | done = 1; |
196 | list_for_each_entry_safe_reverse(ai, tmp, head, ai_list) { | |
b3b94faa DT |
197 | if (ai->ai_sync_gen >= sync_gen) |
198 | continue; | |
199 | ai->ai_sync_gen = sync_gen; | |
74669416 SW |
200 | gfs2_ail1_start_one(sdp, ai); /* This may drop log lock */ |
201 | done = 0; | |
b3b94faa DT |
202 | break; |
203 | } | |
b3b94faa DT |
204 | } |
205 | ||
206 | gfs2_log_unlock(sdp); | |
207 | } | |
208 | ||
209 | int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags) | |
210 | { | |
211 | struct gfs2_ail *ai, *s; | |
212 | int ret; | |
213 | ||
214 | gfs2_log_lock(sdp); | |
215 | ||
216 | list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) { | |
217 | if (gfs2_ail1_empty_one(sdp, ai, flags)) | |
218 | list_move(&ai->ai_list, &sdp->sd_ail2_list); | |
219 | else if (!(flags & DIO_ALL)) | |
220 | break; | |
221 | } | |
222 | ||
223 | ret = list_empty(&sdp->sd_ail1_list); | |
224 | ||
225 | gfs2_log_unlock(sdp); | |
226 | ||
227 | return ret; | |
228 | } | |
229 | ||
ddacfaf7 SW |
230 | |
231 | /** | |
232 | * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced | |
233 | * @sdp: the filesystem | |
234 | * @ai: the AIL entry | |
235 | * | |
236 | */ | |
237 | ||
238 | static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) | |
239 | { | |
240 | struct list_head *head = &ai->ai_ail2_list; | |
241 | struct gfs2_bufdata *bd; | |
242 | ||
243 | while (!list_empty(head)) { | |
244 | bd = list_entry(head->prev, struct gfs2_bufdata, | |
245 | bd_ail_st_list); | |
246 | gfs2_assert(sdp, bd->bd_ail == ai); | |
1e1a3d03 | 247 | gfs2_remove_from_ail(bd->bd_bh->b_page->mapping, bd); |
ddacfaf7 SW |
248 | } |
249 | } | |
250 | ||
b3b94faa DT |
251 | static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail) |
252 | { | |
253 | struct gfs2_ail *ai, *safe; | |
254 | unsigned int old_tail = sdp->sd_log_tail; | |
255 | int wrap = (new_tail < old_tail); | |
256 | int a, b, rm; | |
257 | ||
258 | gfs2_log_lock(sdp); | |
259 | ||
260 | list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) { | |
261 | a = (old_tail <= ai->ai_first); | |
262 | b = (ai->ai_first < new_tail); | |
263 | rm = (wrap) ? (a || b) : (a && b); | |
264 | if (!rm) | |
265 | continue; | |
266 | ||
267 | gfs2_ail2_empty_one(sdp, ai); | |
268 | list_del(&ai->ai_list); | |
269 | gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list)); | |
270 | gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list)); | |
271 | kfree(ai); | |
272 | } | |
273 | ||
274 | gfs2_log_unlock(sdp); | |
275 | } | |
276 | ||
277 | /** | |
278 | * gfs2_log_reserve - Make a log reservation | |
279 | * @sdp: The GFS2 superblock | |
280 | * @blks: The number of blocks to reserve | |
281 | * | |
89918647 | 282 | * Note that we never give out the last few blocks of the journal. Thats |
2332c443 | 283 | * due to the fact that there is a small number of header blocks |
b004157a SW |
284 | * associated with each log flush. The exact number can't be known until |
285 | * flush time, so we ensure that we have just enough free blocks at all | |
286 | * times to avoid running out during a log flush. | |
287 | * | |
b3b94faa DT |
288 | * Returns: errno |
289 | */ | |
290 | ||
291 | int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks) | |
292 | { | |
b3b94faa | 293 | unsigned int try = 0; |
89918647 | 294 | unsigned reserved_blks = 6 * (4096 / sdp->sd_vfs->s_blocksize); |
b3b94faa DT |
295 | |
296 | if (gfs2_assert_warn(sdp, blks) || | |
297 | gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks)) | |
298 | return -EINVAL; | |
299 | ||
71b86f56 | 300 | mutex_lock(&sdp->sd_log_reserve_mutex); |
484adff8 | 301 | gfs2_log_lock(sdp); |
89918647 | 302 | while(sdp->sd_log_blks_free <= (blks + reserved_blks)) { |
b3b94faa | 303 | gfs2_log_unlock(sdp); |
b3b94faa | 304 | gfs2_ail1_empty(sdp, 0); |
b09e593d | 305 | gfs2_log_flush(sdp, NULL); |
b3b94faa DT |
306 | |
307 | if (try++) | |
308 | gfs2_ail1_start(sdp, 0); | |
484adff8 | 309 | gfs2_log_lock(sdp); |
b3b94faa | 310 | } |
484adff8 SW |
311 | sdp->sd_log_blks_free -= blks; |
312 | gfs2_log_unlock(sdp); | |
313 | mutex_unlock(&sdp->sd_log_reserve_mutex); | |
314 | ||
315 | down_read(&sdp->sd_log_flush_lock); | |
b3b94faa DT |
316 | |
317 | return 0; | |
318 | } | |
319 | ||
320 | /** | |
321 | * gfs2_log_release - Release a given number of log blocks | |
322 | * @sdp: The GFS2 superblock | |
323 | * @blks: The number of blocks | |
324 | * | |
325 | */ | |
326 | ||
327 | void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks) | |
328 | { | |
b3b94faa DT |
329 | |
330 | gfs2_log_lock(sdp); | |
331 | sdp->sd_log_blks_free += blks; | |
332 | gfs2_assert_withdraw(sdp, | |
333 | sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); | |
334 | gfs2_log_unlock(sdp); | |
ed386507 | 335 | up_read(&sdp->sd_log_flush_lock); |
b3b94faa DT |
336 | } |
337 | ||
cd915493 | 338 | static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn) |
b3b94faa | 339 | { |
23591256 | 340 | struct inode *inode = sdp->sd_jdesc->jd_inode; |
b3b94faa | 341 | int error; |
23591256 | 342 | struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; |
b3b94faa | 343 | |
23591256 SW |
344 | bh_map.b_size = 1 << inode->i_blkbits; |
345 | error = gfs2_block_map(inode, lbn, 0, &bh_map); | |
7a6bbacb | 346 | if (error || !bh_map.b_blocknr) |
aed3255f RK |
347 | printk(KERN_INFO "error=%d, dbn=%llu lbn=%u", error, |
348 | (unsigned long long)bh_map.b_blocknr, lbn); | |
7a6bbacb | 349 | gfs2_assert_withdraw(sdp, !error && bh_map.b_blocknr); |
b3b94faa | 350 | |
7a6bbacb | 351 | return bh_map.b_blocknr; |
b3b94faa DT |
352 | } |
353 | ||
354 | /** | |
355 | * log_distance - Compute distance between two journal blocks | |
356 | * @sdp: The GFS2 superblock | |
357 | * @newer: The most recent journal block of the pair | |
358 | * @older: The older journal block of the pair | |
359 | * | |
360 | * Compute the distance (in the journal direction) between two | |
361 | * blocks in the journal | |
362 | * | |
363 | * Returns: the distance in blocks | |
364 | */ | |
365 | ||
faa31ce8 | 366 | static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer, |
b3b94faa DT |
367 | unsigned int older) |
368 | { | |
369 | int dist; | |
370 | ||
371 | dist = newer - older; | |
372 | if (dist < 0) | |
373 | dist += sdp->sd_jdesc->jd_blocks; | |
374 | ||
375 | return dist; | |
376 | } | |
377 | ||
2332c443 RP |
378 | /** |
379 | * calc_reserved - Calculate the number of blocks to reserve when | |
380 | * refunding a transaction's unused buffers. | |
381 | * @sdp: The GFS2 superblock | |
382 | * | |
383 | * This is complex. We need to reserve room for all our currently used | |
384 | * metadata buffers (e.g. normal file I/O rewriting file time stamps) and | |
385 | * all our journaled data buffers for journaled files (e.g. files in the | |
386 | * meta_fs like rindex, or files for which chattr +j was done.) | |
387 | * If we don't reserve enough space, gfs2_log_refund and gfs2_log_flush | |
388 | * will count it as free space (sd_log_blks_free) and corruption will follow. | |
389 | * | |
390 | * We can have metadata bufs and jdata bufs in the same journal. So each | |
391 | * type gets its own log header, for which we need to reserve a block. | |
392 | * In fact, each type has the potential for needing more than one header | |
393 | * in cases where we have more buffers than will fit on a journal page. | |
394 | * Metadata journal entries take up half the space of journaled buffer entries. | |
395 | * Thus, metadata entries have buf_limit (502) and journaled buffers have | |
396 | * databuf_limit (251) before they cause a wrap around. | |
397 | * | |
398 | * Also, we need to reserve blocks for revoke journal entries and one for an | |
399 | * overall header for the lot. | |
400 | * | |
401 | * Returns: the number of blocks reserved | |
402 | */ | |
403 | static unsigned int calc_reserved(struct gfs2_sbd *sdp) | |
404 | { | |
405 | unsigned int reserved = 0; | |
406 | unsigned int mbuf_limit, metabufhdrs_needed; | |
407 | unsigned int dbuf_limit, databufhdrs_needed; | |
408 | unsigned int revokes = 0; | |
409 | ||
410 | mbuf_limit = buf_limit(sdp); | |
411 | metabufhdrs_needed = (sdp->sd_log_commited_buf + | |
412 | (mbuf_limit - 1)) / mbuf_limit; | |
413 | dbuf_limit = databuf_limit(sdp); | |
414 | databufhdrs_needed = (sdp->sd_log_commited_databuf + | |
415 | (dbuf_limit - 1)) / dbuf_limit; | |
416 | ||
417 | if (sdp->sd_log_commited_revoke) | |
418 | revokes = gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke, | |
419 | sizeof(u64)); | |
420 | ||
421 | reserved = sdp->sd_log_commited_buf + metabufhdrs_needed + | |
422 | sdp->sd_log_commited_databuf + databufhdrs_needed + | |
423 | revokes; | |
424 | /* One for the overall header */ | |
425 | if (reserved) | |
426 | reserved++; | |
427 | return reserved; | |
428 | } | |
429 | ||
b3b94faa DT |
430 | static unsigned int current_tail(struct gfs2_sbd *sdp) |
431 | { | |
432 | struct gfs2_ail *ai; | |
433 | unsigned int tail; | |
434 | ||
435 | gfs2_log_lock(sdp); | |
436 | ||
faa31ce8 | 437 | if (list_empty(&sdp->sd_ail1_list)) { |
b3b94faa | 438 | tail = sdp->sd_log_head; |
faa31ce8 SW |
439 | } else { |
440 | ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail, ai_list); | |
b3b94faa DT |
441 | tail = ai->ai_first; |
442 | } | |
443 | ||
444 | gfs2_log_unlock(sdp); | |
445 | ||
446 | return tail; | |
447 | } | |
448 | ||
449 | static inline void log_incr_head(struct gfs2_sbd *sdp) | |
450 | { | |
451 | if (sdp->sd_log_flush_head == sdp->sd_log_tail) | |
faa31ce8 | 452 | gfs2_assert_withdraw(sdp, sdp->sd_log_flush_head == sdp->sd_log_head); |
b3b94faa DT |
453 | |
454 | if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) { | |
455 | sdp->sd_log_flush_head = 0; | |
456 | sdp->sd_log_flush_wrapped = 1; | |
457 | } | |
458 | } | |
459 | ||
460 | /** | |
461 | * gfs2_log_get_buf - Get and initialize a buffer to use for log control data | |
462 | * @sdp: The GFS2 superblock | |
463 | * | |
464 | * Returns: the buffer_head | |
465 | */ | |
466 | ||
467 | struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp) | |
468 | { | |
cd915493 | 469 | u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); |
b3b94faa DT |
470 | struct gfs2_log_buf *lb; |
471 | struct buffer_head *bh; | |
472 | ||
4f3df041 | 473 | lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
474 | list_add(&lb->lb_list, &sdp->sd_log_flush_list); |
475 | ||
476 | bh = lb->lb_bh = sb_getblk(sdp->sd_vfs, blkno); | |
477 | lock_buffer(bh); | |
478 | memset(bh->b_data, 0, bh->b_size); | |
479 | set_buffer_uptodate(bh); | |
480 | clear_buffer_dirty(bh); | |
481 | unlock_buffer(bh); | |
482 | ||
483 | log_incr_head(sdp); | |
484 | ||
485 | return bh; | |
486 | } | |
487 | ||
488 | /** | |
489 | * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log | |
490 | * @sdp: the filesystem | |
491 | * @data: the data the buffer_head should point to | |
492 | * | |
493 | * Returns: the log buffer descriptor | |
494 | */ | |
495 | ||
496 | struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp, | |
497 | struct buffer_head *real) | |
498 | { | |
cd915493 | 499 | u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); |
b3b94faa DT |
500 | struct gfs2_log_buf *lb; |
501 | struct buffer_head *bh; | |
502 | ||
4f3df041 | 503 | lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
504 | list_add(&lb->lb_list, &sdp->sd_log_flush_list); |
505 | lb->lb_real = real; | |
506 | ||
507 | bh = lb->lb_bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL); | |
508 | atomic_set(&bh->b_count, 1); | |
509 | bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate); | |
18ec7d5c | 510 | set_bh_page(bh, real->b_page, bh_offset(real)); |
b3b94faa DT |
511 | bh->b_blocknr = blkno; |
512 | bh->b_size = sdp->sd_sb.sb_bsize; | |
513 | bh->b_bdev = sdp->sd_vfs->s_bdev; | |
514 | ||
515 | log_incr_head(sdp); | |
516 | ||
517 | return bh; | |
518 | } | |
519 | ||
2332c443 | 520 | static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail) |
b3b94faa DT |
521 | { |
522 | unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail); | |
523 | ||
524 | ail2_empty(sdp, new_tail); | |
525 | ||
526 | gfs2_log_lock(sdp); | |
2332c443 | 527 | sdp->sd_log_blks_free += dist; |
faa31ce8 | 528 | gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); |
b3b94faa DT |
529 | gfs2_log_unlock(sdp); |
530 | ||
531 | sdp->sd_log_tail = new_tail; | |
532 | } | |
533 | ||
534 | /** | |
535 | * log_write_header - Get and initialize a journal header buffer | |
536 | * @sdp: The GFS2 superblock | |
537 | * | |
538 | * Returns: the initialized log buffer descriptor | |
539 | */ | |
540 | ||
cd915493 | 541 | static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull) |
b3b94faa | 542 | { |
cd915493 | 543 | u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); |
b3b94faa DT |
544 | struct buffer_head *bh; |
545 | struct gfs2_log_header *lh; | |
546 | unsigned int tail; | |
cd915493 | 547 | u32 hash; |
b3b94faa | 548 | |
b3b94faa DT |
549 | bh = sb_getblk(sdp->sd_vfs, blkno); |
550 | lock_buffer(bh); | |
551 | memset(bh->b_data, 0, bh->b_size); | |
552 | set_buffer_uptodate(bh); | |
553 | clear_buffer_dirty(bh); | |
554 | unlock_buffer(bh); | |
555 | ||
556 | gfs2_ail1_empty(sdp, 0); | |
557 | tail = current_tail(sdp); | |
558 | ||
559 | lh = (struct gfs2_log_header *)bh->b_data; | |
560 | memset(lh, 0, sizeof(struct gfs2_log_header)); | |
561 | lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC); | |
e3167ded SW |
562 | lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH); |
563 | lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH); | |
e0f2bf78 SW |
564 | lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++); |
565 | lh->lh_flags = cpu_to_be32(flags); | |
566 | lh->lh_tail = cpu_to_be32(tail); | |
567 | lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head); | |
b3b94faa DT |
568 | hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header)); |
569 | lh->lh_hash = cpu_to_be32(hash); | |
570 | ||
571 | set_buffer_dirty(bh); | |
572 | if (sync_dirty_buffer(bh)) | |
573 | gfs2_io_error_bh(sdp, bh); | |
574 | brelse(bh); | |
575 | ||
576 | if (sdp->sd_log_tail != tail) | |
2332c443 | 577 | log_pull_tail(sdp, tail); |
b3b94faa DT |
578 | else |
579 | gfs2_assert_withdraw(sdp, !pull); | |
580 | ||
581 | sdp->sd_log_idle = (tail == sdp->sd_log_flush_head); | |
582 | log_incr_head(sdp); | |
583 | } | |
584 | ||
585 | static void log_flush_commit(struct gfs2_sbd *sdp) | |
586 | { | |
587 | struct list_head *head = &sdp->sd_log_flush_list; | |
588 | struct gfs2_log_buf *lb; | |
589 | struct buffer_head *bh; | |
a0a24741 | 590 | int flushcount = 0; |
b3b94faa DT |
591 | |
592 | while (!list_empty(head)) { | |
593 | lb = list_entry(head->next, struct gfs2_log_buf, lb_list); | |
594 | list_del(&lb->lb_list); | |
595 | bh = lb->lb_bh; | |
596 | ||
597 | wait_on_buffer(bh); | |
598 | if (!buffer_uptodate(bh)) | |
599 | gfs2_io_error_bh(sdp, bh); | |
600 | if (lb->lb_real) { | |
601 | while (atomic_read(&bh->b_count) != 1) /* Grrrr... */ | |
602 | schedule(); | |
603 | free_buffer_head(bh); | |
604 | } else | |
605 | brelse(bh); | |
606 | kfree(lb); | |
a0a24741 | 607 | flushcount++; |
b3b94faa DT |
608 | } |
609 | ||
a0a24741 SW |
610 | /* If nothing was journaled, the header is unplanned and unwanted. */ |
611 | if (flushcount) { | |
612 | log_write_header(sdp, 0, 0); | |
613 | } else { | |
614 | unsigned int tail; | |
615 | tail = current_tail(sdp); | |
616 | ||
617 | gfs2_ail1_empty(sdp, 0); | |
618 | if (sdp->sd_log_tail != tail) | |
619 | log_pull_tail(sdp, tail); | |
620 | } | |
b3b94faa DT |
621 | } |
622 | ||
623 | /** | |
b09e593d | 624 | * gfs2_log_flush - flush incore transaction(s) |
b3b94faa DT |
625 | * @sdp: the filesystem |
626 | * @gl: The glock structure to flush. If NULL, flush the whole incore log | |
627 | * | |
628 | */ | |
629 | ||
b09e593d | 630 | void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl) |
b3b94faa DT |
631 | { |
632 | struct gfs2_ail *ai; | |
633 | ||
484adff8 | 634 | down_write(&sdp->sd_log_flush_lock); |
f55ab26a SW |
635 | |
636 | if (gl) { | |
637 | gfs2_log_lock(sdp); | |
638 | if (list_empty(&gl->gl_le.le_list)) { | |
639 | gfs2_log_unlock(sdp); | |
484adff8 | 640 | up_write(&sdp->sd_log_flush_lock); |
f55ab26a SW |
641 | return; |
642 | } | |
643 | gfs2_log_unlock(sdp); | |
644 | } | |
645 | ||
b09e593d SW |
646 | ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL); |
647 | INIT_LIST_HEAD(&ai->ai_ail1_list); | |
648 | INIT_LIST_HEAD(&ai->ai_ail2_list); | |
b3b94faa | 649 | |
2332c443 RP |
650 | gfs2_assert_withdraw(sdp, |
651 | sdp->sd_log_num_buf + sdp->sd_log_num_jdata == | |
652 | sdp->sd_log_commited_buf + | |
653 | sdp->sd_log_commited_databuf); | |
b3b94faa DT |
654 | gfs2_assert_withdraw(sdp, |
655 | sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke); | |
656 | ||
b3b94faa DT |
657 | sdp->sd_log_flush_head = sdp->sd_log_head; |
658 | sdp->sd_log_flush_wrapped = 0; | |
659 | ai->ai_first = sdp->sd_log_flush_head; | |
660 | ||
661 | lops_before_commit(sdp); | |
662 | if (!list_empty(&sdp->sd_log_flush_list)) | |
663 | log_flush_commit(sdp); | |
2332c443 RP |
664 | else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){ |
665 | gfs2_log_lock(sdp); | |
666 | sdp->sd_log_blks_free--; /* Adjust for unreserved buffer */ | |
667 | gfs2_log_unlock(sdp); | |
b3b94faa | 668 | log_write_header(sdp, 0, PULL); |
2332c443 | 669 | } |
b3b94faa | 670 | lops_after_commit(sdp, ai); |
b09e593d | 671 | |
fe1a698f SW |
672 | gfs2_log_lock(sdp); |
673 | sdp->sd_log_head = sdp->sd_log_flush_head; | |
faa31ce8 SW |
674 | sdp->sd_log_blks_reserved = 0; |
675 | sdp->sd_log_commited_buf = 0; | |
2332c443 | 676 | sdp->sd_log_commited_databuf = 0; |
faa31ce8 | 677 | sdp->sd_log_commited_revoke = 0; |
b3b94faa | 678 | |
b3b94faa DT |
679 | if (!list_empty(&ai->ai_ail1_list)) { |
680 | list_add(&ai->ai_list, &sdp->sd_ail1_list); | |
681 | ai = NULL; | |
682 | } | |
683 | gfs2_log_unlock(sdp); | |
684 | ||
b3b94faa | 685 | sdp->sd_vfs->s_dirt = 0; |
484adff8 | 686 | up_write(&sdp->sd_log_flush_lock); |
b3b94faa DT |
687 | |
688 | kfree(ai); | |
689 | } | |
690 | ||
691 | static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr) | |
692 | { | |
2332c443 | 693 | unsigned int reserved; |
b3b94faa DT |
694 | unsigned int old; |
695 | ||
696 | gfs2_log_lock(sdp); | |
697 | ||
698 | sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm; | |
2332c443 RP |
699 | sdp->sd_log_commited_databuf += tr->tr_num_databuf_new - |
700 | tr->tr_num_databuf_rm; | |
701 | gfs2_assert_withdraw(sdp, (((int)sdp->sd_log_commited_buf) >= 0) || | |
702 | (((int)sdp->sd_log_commited_databuf) >= 0)); | |
b3b94faa DT |
703 | sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm; |
704 | gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0); | |
2332c443 | 705 | reserved = calc_reserved(sdp); |
b3b94faa DT |
706 | old = sdp->sd_log_blks_free; |
707 | sdp->sd_log_blks_free += tr->tr_reserved - | |
708 | (reserved - sdp->sd_log_blks_reserved); | |
709 | ||
b09e593d | 710 | gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free >= old); |
2332c443 RP |
711 | gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <= |
712 | sdp->sd_jdesc->jd_blocks); | |
b3b94faa DT |
713 | |
714 | sdp->sd_log_blks_reserved = reserved; | |
715 | ||
716 | gfs2_log_unlock(sdp); | |
717 | } | |
718 | ||
719 | /** | |
720 | * gfs2_log_commit - Commit a transaction to the log | |
721 | * @sdp: the filesystem | |
722 | * @tr: the transaction | |
723 | * | |
724 | * Returns: errno | |
725 | */ | |
726 | ||
727 | void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) | |
728 | { | |
729 | log_refund(sdp, tr); | |
730 | lops_incore_commit(sdp, tr); | |
731 | ||
732 | sdp->sd_vfs->s_dirt = 1; | |
484adff8 | 733 | up_read(&sdp->sd_log_flush_lock); |
b3b94faa | 734 | |
b3b94faa | 735 | gfs2_log_lock(sdp); |
b004157a SW |
736 | if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks)) |
737 | wake_up_process(sdp->sd_logd_process); | |
738 | gfs2_log_unlock(sdp); | |
b3b94faa DT |
739 | } |
740 | ||
741 | /** | |
742 | * gfs2_log_shutdown - write a shutdown header into a journal | |
743 | * @sdp: the filesystem | |
744 | * | |
745 | */ | |
746 | ||
747 | void gfs2_log_shutdown(struct gfs2_sbd *sdp) | |
748 | { | |
484adff8 | 749 | down_write(&sdp->sd_log_flush_lock); |
b3b94faa | 750 | |
b3b94faa DT |
751 | gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved); |
752 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_gl); | |
753 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf); | |
18ec7d5c | 754 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_jdata); |
b3b94faa DT |
755 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); |
756 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg); | |
757 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf); | |
758 | gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list)); | |
759 | ||
760 | sdp->sd_log_flush_head = sdp->sd_log_head; | |
761 | sdp->sd_log_flush_wrapped = 0; | |
762 | ||
2332c443 RP |
763 | log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT, |
764 | (sdp->sd_log_tail == current_tail(sdp)) ? 0 : PULL); | |
b3b94faa | 765 | |
a74604be SW |
766 | gfs2_assert_warn(sdp, sdp->sd_log_blks_free == sdp->sd_jdesc->jd_blocks); |
767 | gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail); | |
768 | gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list)); | |
b3b94faa DT |
769 | |
770 | sdp->sd_log_head = sdp->sd_log_flush_head; | |
b3b94faa DT |
771 | sdp->sd_log_tail = sdp->sd_log_head; |
772 | ||
484adff8 | 773 | up_write(&sdp->sd_log_flush_lock); |
b3b94faa DT |
774 | } |
775 | ||
a25311c8 SW |
776 | |
777 | /** | |
778 | * gfs2_meta_syncfs - sync all the buffers in a filesystem | |
779 | * @sdp: the filesystem | |
780 | * | |
781 | */ | |
782 | ||
783 | void gfs2_meta_syncfs(struct gfs2_sbd *sdp) | |
784 | { | |
785 | gfs2_log_flush(sdp, NULL); | |
786 | for (;;) { | |
787 | gfs2_ail1_start(sdp, DIO_ALL); | |
788 | if (gfs2_ail1_empty(sdp, DIO_ALL)) | |
789 | break; | |
790 | msleep(10); | |
791 | } | |
792 | } | |
793 |