Commit | Line | Data |
---|---|---|
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; | |
1ad38c43 SW |
74 | list_del_init(&bd->bd_ail_st_list); |
75 | list_del_init(&bd->bd_ail_gl_list); | |
1e1a3d03 SW |
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)) { | |
16615be1 | 107 | if (!buffer_uptodate(bh)) |
ddacfaf7 | 108 | gfs2_io_error_bh(sdp, bh); |
ddacfaf7 SW |
109 | list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); |
110 | continue; | |
111 | } | |
112 | ||
113 | if (!buffer_dirty(bh)) | |
114 | continue; | |
115 | ||
116 | list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list); | |
117 | ||
16615be1 | 118 | get_bh(bh); |
ddacfaf7 | 119 | gfs2_log_unlock(sdp); |
16615be1 SW |
120 | lock_buffer(bh); |
121 | if (test_clear_buffer_dirty(bh)) { | |
122 | bh->b_end_io = end_buffer_write_sync; | |
123 | submit_bh(WRITE, bh); | |
124 | } else { | |
125 | unlock_buffer(bh); | |
126 | brelse(bh); | |
127 | } | |
ddacfaf7 SW |
128 | gfs2_log_lock(sdp); |
129 | ||
130 | retry = 1; | |
131 | break; | |
132 | } | |
133 | } while (retry); | |
134 | } | |
135 | ||
136 | /** | |
137 | * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced | |
138 | * @sdp: the filesystem | |
139 | * @ai: the AIL entry | |
140 | * | |
141 | */ | |
142 | ||
143 | static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags) | |
144 | { | |
145 | struct gfs2_bufdata *bd, *s; | |
146 | struct buffer_head *bh; | |
147 | ||
148 | list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, | |
149 | bd_ail_st_list) { | |
150 | bh = bd->bd_bh; | |
151 | ||
152 | gfs2_assert(sdp, bd->bd_ail == ai); | |
153 | ||
154 | if (buffer_busy(bh)) { | |
155 | if (flags & DIO_ALL) | |
156 | continue; | |
157 | else | |
158 | break; | |
159 | } | |
160 | ||
161 | if (!buffer_uptodate(bh)) | |
162 | gfs2_io_error_bh(sdp, bh); | |
163 | ||
164 | list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); | |
165 | } | |
166 | ||
167 | return list_empty(&ai->ai_ail1_list); | |
168 | } | |
169 | ||
a25311c8 | 170 | static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags) |
b3b94faa | 171 | { |
693ddeab | 172 | struct list_head *head; |
cd915493 | 173 | u64 sync_gen; |
74669416 SW |
174 | struct list_head *first; |
175 | struct gfs2_ail *first_ai, *ai, *tmp; | |
176 | int done = 0; | |
b3b94faa DT |
177 | |
178 | gfs2_log_lock(sdp); | |
693ddeab | 179 | head = &sdp->sd_ail1_list; |
b3b94faa DT |
180 | if (list_empty(head)) { |
181 | gfs2_log_unlock(sdp); | |
182 | return; | |
183 | } | |
184 | sync_gen = sdp->sd_ail_sync_gen++; | |
185 | ||
186 | first = head->prev; | |
187 | first_ai = list_entry(first, struct gfs2_ail, ai_list); | |
188 | first_ai->ai_sync_gen = sync_gen; | |
74669416 | 189 | gfs2_ail1_start_one(sdp, first_ai); /* This may drop log lock */ |
b3b94faa DT |
190 | |
191 | if (flags & DIO_ALL) | |
192 | first = NULL; | |
193 | ||
74669416 | 194 | while(!done) { |
484adff8 SW |
195 | if (first && (head->prev != first || |
196 | gfs2_ail1_empty_one(sdp, first_ai, 0))) | |
b3b94faa DT |
197 | break; |
198 | ||
74669416 SW |
199 | done = 1; |
200 | list_for_each_entry_safe_reverse(ai, tmp, head, ai_list) { | |
b3b94faa DT |
201 | if (ai->ai_sync_gen >= sync_gen) |
202 | continue; | |
203 | ai->ai_sync_gen = sync_gen; | |
74669416 SW |
204 | gfs2_ail1_start_one(sdp, ai); /* This may drop log lock */ |
205 | done = 0; | |
b3b94faa DT |
206 | break; |
207 | } | |
b3b94faa DT |
208 | } |
209 | ||
210 | gfs2_log_unlock(sdp); | |
211 | } | |
212 | ||
213 | int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags) | |
214 | { | |
215 | struct gfs2_ail *ai, *s; | |
216 | int ret; | |
217 | ||
218 | gfs2_log_lock(sdp); | |
219 | ||
220 | list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) { | |
221 | if (gfs2_ail1_empty_one(sdp, ai, flags)) | |
222 | list_move(&ai->ai_list, &sdp->sd_ail2_list); | |
223 | else if (!(flags & DIO_ALL)) | |
224 | break; | |
225 | } | |
226 | ||
227 | ret = list_empty(&sdp->sd_ail1_list); | |
228 | ||
229 | gfs2_log_unlock(sdp); | |
230 | ||
231 | return ret; | |
232 | } | |
233 | ||
ddacfaf7 SW |
234 | |
235 | /** | |
236 | * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced | |
237 | * @sdp: the filesystem | |
238 | * @ai: the AIL entry | |
239 | * | |
240 | */ | |
241 | ||
242 | static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) | |
243 | { | |
244 | struct list_head *head = &ai->ai_ail2_list; | |
245 | struct gfs2_bufdata *bd; | |
246 | ||
247 | while (!list_empty(head)) { | |
248 | bd = list_entry(head->prev, struct gfs2_bufdata, | |
249 | bd_ail_st_list); | |
250 | gfs2_assert(sdp, bd->bd_ail == ai); | |
1e1a3d03 | 251 | gfs2_remove_from_ail(bd->bd_bh->b_page->mapping, bd); |
ddacfaf7 SW |
252 | } |
253 | } | |
254 | ||
b3b94faa DT |
255 | static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail) |
256 | { | |
257 | struct gfs2_ail *ai, *safe; | |
258 | unsigned int old_tail = sdp->sd_log_tail; | |
259 | int wrap = (new_tail < old_tail); | |
260 | int a, b, rm; | |
261 | ||
262 | gfs2_log_lock(sdp); | |
263 | ||
264 | list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) { | |
265 | a = (old_tail <= ai->ai_first); | |
266 | b = (ai->ai_first < new_tail); | |
267 | rm = (wrap) ? (a || b) : (a && b); | |
268 | if (!rm) | |
269 | continue; | |
270 | ||
271 | gfs2_ail2_empty_one(sdp, ai); | |
272 | list_del(&ai->ai_list); | |
273 | gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list)); | |
274 | gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list)); | |
275 | kfree(ai); | |
276 | } | |
277 | ||
278 | gfs2_log_unlock(sdp); | |
279 | } | |
280 | ||
281 | /** | |
282 | * gfs2_log_reserve - Make a log reservation | |
283 | * @sdp: The GFS2 superblock | |
284 | * @blks: The number of blocks to reserve | |
285 | * | |
89918647 | 286 | * Note that we never give out the last few blocks of the journal. Thats |
2332c443 | 287 | * due to the fact that there is a small number of header blocks |
b004157a SW |
288 | * associated with each log flush. The exact number can't be known until |
289 | * flush time, so we ensure that we have just enough free blocks at all | |
290 | * times to avoid running out during a log flush. | |
291 | * | |
b3b94faa DT |
292 | * Returns: errno |
293 | */ | |
294 | ||
295 | int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks) | |
296 | { | |
b3b94faa | 297 | unsigned int try = 0; |
89918647 | 298 | unsigned reserved_blks = 6 * (4096 / sdp->sd_vfs->s_blocksize); |
b3b94faa DT |
299 | |
300 | if (gfs2_assert_warn(sdp, blks) || | |
301 | gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks)) | |
302 | return -EINVAL; | |
303 | ||
71b86f56 | 304 | mutex_lock(&sdp->sd_log_reserve_mutex); |
484adff8 | 305 | gfs2_log_lock(sdp); |
89918647 | 306 | while(sdp->sd_log_blks_free <= (blks + reserved_blks)) { |
b3b94faa | 307 | gfs2_log_unlock(sdp); |
b3b94faa | 308 | gfs2_ail1_empty(sdp, 0); |
b09e593d | 309 | gfs2_log_flush(sdp, NULL); |
b3b94faa DT |
310 | |
311 | if (try++) | |
312 | gfs2_ail1_start(sdp, 0); | |
484adff8 | 313 | gfs2_log_lock(sdp); |
b3b94faa | 314 | } |
484adff8 SW |
315 | sdp->sd_log_blks_free -= blks; |
316 | gfs2_log_unlock(sdp); | |
317 | mutex_unlock(&sdp->sd_log_reserve_mutex); | |
318 | ||
319 | down_read(&sdp->sd_log_flush_lock); | |
b3b94faa DT |
320 | |
321 | return 0; | |
322 | } | |
323 | ||
324 | /** | |
325 | * gfs2_log_release - Release a given number of log blocks | |
326 | * @sdp: The GFS2 superblock | |
327 | * @blks: The number of blocks | |
328 | * | |
329 | */ | |
330 | ||
331 | void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks) | |
332 | { | |
b3b94faa DT |
333 | |
334 | gfs2_log_lock(sdp); | |
335 | sdp->sd_log_blks_free += blks; | |
336 | gfs2_assert_withdraw(sdp, | |
337 | sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); | |
338 | gfs2_log_unlock(sdp); | |
ed386507 | 339 | up_read(&sdp->sd_log_flush_lock); |
b3b94faa DT |
340 | } |
341 | ||
cd915493 | 342 | static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn) |
b3b94faa | 343 | { |
23591256 | 344 | struct inode *inode = sdp->sd_jdesc->jd_inode; |
b3b94faa | 345 | int error; |
23591256 | 346 | struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; |
b3b94faa | 347 | |
23591256 SW |
348 | bh_map.b_size = 1 << inode->i_blkbits; |
349 | error = gfs2_block_map(inode, lbn, 0, &bh_map); | |
7a6bbacb | 350 | if (error || !bh_map.b_blocknr) |
aed3255f RK |
351 | printk(KERN_INFO "error=%d, dbn=%llu lbn=%u", error, |
352 | (unsigned long long)bh_map.b_blocknr, lbn); | |
7a6bbacb | 353 | gfs2_assert_withdraw(sdp, !error && bh_map.b_blocknr); |
b3b94faa | 354 | |
7a6bbacb | 355 | return bh_map.b_blocknr; |
b3b94faa DT |
356 | } |
357 | ||
358 | /** | |
359 | * log_distance - Compute distance between two journal blocks | |
360 | * @sdp: The GFS2 superblock | |
361 | * @newer: The most recent journal block of the pair | |
362 | * @older: The older journal block of the pair | |
363 | * | |
364 | * Compute the distance (in the journal direction) between two | |
365 | * blocks in the journal | |
366 | * | |
367 | * Returns: the distance in blocks | |
368 | */ | |
369 | ||
faa31ce8 | 370 | static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer, |
b3b94faa DT |
371 | unsigned int older) |
372 | { | |
373 | int dist; | |
374 | ||
375 | dist = newer - older; | |
376 | if (dist < 0) | |
377 | dist += sdp->sd_jdesc->jd_blocks; | |
378 | ||
379 | return dist; | |
380 | } | |
381 | ||
2332c443 RP |
382 | /** |
383 | * calc_reserved - Calculate the number of blocks to reserve when | |
384 | * refunding a transaction's unused buffers. | |
385 | * @sdp: The GFS2 superblock | |
386 | * | |
387 | * This is complex. We need to reserve room for all our currently used | |
388 | * metadata buffers (e.g. normal file I/O rewriting file time stamps) and | |
389 | * all our journaled data buffers for journaled files (e.g. files in the | |
390 | * meta_fs like rindex, or files for which chattr +j was done.) | |
391 | * If we don't reserve enough space, gfs2_log_refund and gfs2_log_flush | |
392 | * will count it as free space (sd_log_blks_free) and corruption will follow. | |
393 | * | |
394 | * We can have metadata bufs and jdata bufs in the same journal. So each | |
395 | * type gets its own log header, for which we need to reserve a block. | |
396 | * In fact, each type has the potential for needing more than one header | |
397 | * in cases where we have more buffers than will fit on a journal page. | |
398 | * Metadata journal entries take up half the space of journaled buffer entries. | |
399 | * Thus, metadata entries have buf_limit (502) and journaled buffers have | |
400 | * databuf_limit (251) before they cause a wrap around. | |
401 | * | |
402 | * Also, we need to reserve blocks for revoke journal entries and one for an | |
403 | * overall header for the lot. | |
404 | * | |
405 | * Returns: the number of blocks reserved | |
406 | */ | |
407 | static unsigned int calc_reserved(struct gfs2_sbd *sdp) | |
408 | { | |
409 | unsigned int reserved = 0; | |
410 | unsigned int mbuf_limit, metabufhdrs_needed; | |
411 | unsigned int dbuf_limit, databufhdrs_needed; | |
412 | unsigned int revokes = 0; | |
413 | ||
414 | mbuf_limit = buf_limit(sdp); | |
415 | metabufhdrs_needed = (sdp->sd_log_commited_buf + | |
416 | (mbuf_limit - 1)) / mbuf_limit; | |
417 | dbuf_limit = databuf_limit(sdp); | |
418 | databufhdrs_needed = (sdp->sd_log_commited_databuf + | |
419 | (dbuf_limit - 1)) / dbuf_limit; | |
420 | ||
421 | if (sdp->sd_log_commited_revoke) | |
422 | revokes = gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke, | |
423 | sizeof(u64)); | |
424 | ||
425 | reserved = sdp->sd_log_commited_buf + metabufhdrs_needed + | |
426 | sdp->sd_log_commited_databuf + databufhdrs_needed + | |
427 | revokes; | |
428 | /* One for the overall header */ | |
429 | if (reserved) | |
430 | reserved++; | |
431 | return reserved; | |
432 | } | |
433 | ||
b3b94faa DT |
434 | static unsigned int current_tail(struct gfs2_sbd *sdp) |
435 | { | |
436 | struct gfs2_ail *ai; | |
437 | unsigned int tail; | |
438 | ||
439 | gfs2_log_lock(sdp); | |
440 | ||
faa31ce8 | 441 | if (list_empty(&sdp->sd_ail1_list)) { |
b3b94faa | 442 | tail = sdp->sd_log_head; |
faa31ce8 SW |
443 | } else { |
444 | ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail, ai_list); | |
b3b94faa DT |
445 | tail = ai->ai_first; |
446 | } | |
447 | ||
448 | gfs2_log_unlock(sdp); | |
449 | ||
450 | return tail; | |
451 | } | |
452 | ||
16615be1 | 453 | void gfs2_log_incr_head(struct gfs2_sbd *sdp) |
b3b94faa DT |
454 | { |
455 | if (sdp->sd_log_flush_head == sdp->sd_log_tail) | |
16615be1 | 456 | BUG_ON(sdp->sd_log_flush_head != sdp->sd_log_head); |
b3b94faa DT |
457 | |
458 | if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) { | |
459 | sdp->sd_log_flush_head = 0; | |
460 | sdp->sd_log_flush_wrapped = 1; | |
461 | } | |
462 | } | |
463 | ||
16615be1 SW |
464 | /** |
465 | * gfs2_log_write_endio - End of I/O for a log buffer | |
466 | * @bh: The buffer head | |
467 | * @uptodate: I/O Status | |
468 | * | |
469 | */ | |
470 | ||
471 | static void gfs2_log_write_endio(struct buffer_head *bh, int uptodate) | |
472 | { | |
473 | struct gfs2_sbd *sdp = bh->b_private; | |
474 | bh->b_private = NULL; | |
475 | ||
476 | end_buffer_write_sync(bh, uptodate); | |
477 | if (atomic_dec_and_test(&sdp->sd_log_in_flight)) | |
478 | wake_up(&sdp->sd_log_flush_wait); | |
479 | } | |
480 | ||
b3b94faa DT |
481 | /** |
482 | * gfs2_log_get_buf - Get and initialize a buffer to use for log control data | |
483 | * @sdp: The GFS2 superblock | |
484 | * | |
485 | * Returns: the buffer_head | |
486 | */ | |
487 | ||
488 | struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp) | |
489 | { | |
cd915493 | 490 | u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); |
b3b94faa DT |
491 | struct buffer_head *bh; |
492 | ||
16615be1 | 493 | bh = sb_getblk(sdp->sd_vfs, blkno); |
b3b94faa DT |
494 | lock_buffer(bh); |
495 | memset(bh->b_data, 0, bh->b_size); | |
496 | set_buffer_uptodate(bh); | |
497 | clear_buffer_dirty(bh); | |
16615be1 SW |
498 | gfs2_log_incr_head(sdp); |
499 | atomic_inc(&sdp->sd_log_in_flight); | |
500 | bh->b_private = sdp; | |
501 | bh->b_end_io = gfs2_log_write_endio; | |
b3b94faa DT |
502 | |
503 | return bh; | |
504 | } | |
505 | ||
16615be1 SW |
506 | /** |
507 | * gfs2_fake_write_endio - | |
508 | * @bh: The buffer head | |
509 | * @uptodate: The I/O Status | |
510 | * | |
511 | */ | |
512 | ||
513 | static void gfs2_fake_write_endio(struct buffer_head *bh, int uptodate) | |
514 | { | |
515 | struct buffer_head *real_bh = bh->b_private; | |
516 | struct gfs2_sbd *sdp = GFS2_SB(real_bh->b_page->mapping->host); | |
517 | ||
518 | end_buffer_write_sync(bh, uptodate); | |
519 | free_buffer_head(bh); | |
520 | unlock_buffer(real_bh); | |
521 | brelse(real_bh); | |
522 | if (atomic_dec_and_test(&sdp->sd_log_in_flight)) | |
523 | wake_up(&sdp->sd_log_flush_wait); | |
524 | } | |
525 | ||
b3b94faa DT |
526 | /** |
527 | * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log | |
528 | * @sdp: the filesystem | |
529 | * @data: the data the buffer_head should point to | |
530 | * | |
531 | * Returns: the log buffer descriptor | |
532 | */ | |
533 | ||
534 | struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp, | |
535 | struct buffer_head *real) | |
536 | { | |
cd915493 | 537 | u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); |
b3b94faa DT |
538 | struct buffer_head *bh; |
539 | ||
16615be1 | 540 | bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL); |
b3b94faa | 541 | atomic_set(&bh->b_count, 1); |
16615be1 | 542 | bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate) | (1 << BH_Lock); |
18ec7d5c | 543 | set_bh_page(bh, real->b_page, bh_offset(real)); |
b3b94faa DT |
544 | bh->b_blocknr = blkno; |
545 | bh->b_size = sdp->sd_sb.sb_bsize; | |
546 | bh->b_bdev = sdp->sd_vfs->s_bdev; | |
16615be1 SW |
547 | bh->b_private = real; |
548 | bh->b_end_io = gfs2_fake_write_endio; | |
b3b94faa | 549 | |
16615be1 SW |
550 | gfs2_log_incr_head(sdp); |
551 | atomic_inc(&sdp->sd_log_in_flight); | |
b3b94faa DT |
552 | |
553 | return bh; | |
554 | } | |
555 | ||
2332c443 | 556 | static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail) |
b3b94faa DT |
557 | { |
558 | unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail); | |
559 | ||
560 | ail2_empty(sdp, new_tail); | |
561 | ||
562 | gfs2_log_lock(sdp); | |
2332c443 | 563 | sdp->sd_log_blks_free += dist; |
faa31ce8 | 564 | gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); |
b3b94faa DT |
565 | gfs2_log_unlock(sdp); |
566 | ||
567 | sdp->sd_log_tail = new_tail; | |
568 | } | |
569 | ||
570 | /** | |
571 | * log_write_header - Get and initialize a journal header buffer | |
572 | * @sdp: The GFS2 superblock | |
573 | * | |
574 | * Returns: the initialized log buffer descriptor | |
575 | */ | |
576 | ||
cd915493 | 577 | static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull) |
b3b94faa | 578 | { |
cd915493 | 579 | u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); |
b3b94faa DT |
580 | struct buffer_head *bh; |
581 | struct gfs2_log_header *lh; | |
582 | unsigned int tail; | |
cd915493 | 583 | u32 hash; |
b3b94faa | 584 | |
b3b94faa DT |
585 | bh = sb_getblk(sdp->sd_vfs, blkno); |
586 | lock_buffer(bh); | |
587 | memset(bh->b_data, 0, bh->b_size); | |
588 | set_buffer_uptodate(bh); | |
589 | clear_buffer_dirty(bh); | |
590 | unlock_buffer(bh); | |
591 | ||
592 | gfs2_ail1_empty(sdp, 0); | |
593 | tail = current_tail(sdp); | |
594 | ||
595 | lh = (struct gfs2_log_header *)bh->b_data; | |
596 | memset(lh, 0, sizeof(struct gfs2_log_header)); | |
597 | lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC); | |
e3167ded SW |
598 | lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH); |
599 | lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH); | |
e0f2bf78 SW |
600 | lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++); |
601 | lh->lh_flags = cpu_to_be32(flags); | |
602 | lh->lh_tail = cpu_to_be32(tail); | |
603 | lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head); | |
b3b94faa DT |
604 | hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header)); |
605 | lh->lh_hash = cpu_to_be32(hash); | |
606 | ||
607 | set_buffer_dirty(bh); | |
608 | if (sync_dirty_buffer(bh)) | |
609 | gfs2_io_error_bh(sdp, bh); | |
610 | brelse(bh); | |
611 | ||
612 | if (sdp->sd_log_tail != tail) | |
2332c443 | 613 | log_pull_tail(sdp, tail); |
b3b94faa DT |
614 | else |
615 | gfs2_assert_withdraw(sdp, !pull); | |
616 | ||
617 | sdp->sd_log_idle = (tail == sdp->sd_log_flush_head); | |
16615be1 | 618 | gfs2_log_incr_head(sdp); |
b3b94faa DT |
619 | } |
620 | ||
621 | static void log_flush_commit(struct gfs2_sbd *sdp) | |
622 | { | |
16615be1 SW |
623 | DEFINE_WAIT(wait); |
624 | ||
625 | if (atomic_read(&sdp->sd_log_in_flight)) { | |
626 | do { | |
627 | prepare_to_wait(&sdp->sd_log_flush_wait, &wait, | |
628 | TASK_UNINTERRUPTIBLE); | |
629 | if (atomic_read(&sdp->sd_log_in_flight)) | |
630 | io_schedule(); | |
631 | } while(atomic_read(&sdp->sd_log_in_flight)); | |
632 | finish_wait(&sdp->sd_log_flush_wait, &wait); | |
b3b94faa DT |
633 | } |
634 | ||
16615be1 | 635 | log_write_header(sdp, 0, 0); |
b3b94faa DT |
636 | } |
637 | ||
d7b616e2 SW |
638 | static void gfs2_ordered_write(struct gfs2_sbd *sdp) |
639 | { | |
640 | struct gfs2_bufdata *bd; | |
641 | struct buffer_head *bh; | |
642 | LIST_HEAD(written); | |
643 | ||
644 | gfs2_log_lock(sdp); | |
645 | while (!list_empty(&sdp->sd_log_le_ordered)) { | |
646 | bd = list_entry(sdp->sd_log_le_ordered.next, struct gfs2_bufdata, bd_le.le_list); | |
647 | list_move(&bd->bd_le.le_list, &written); | |
648 | bh = bd->bd_bh; | |
649 | if (!buffer_dirty(bh)) | |
650 | continue; | |
651 | get_bh(bh); | |
652 | gfs2_log_unlock(sdp); | |
653 | lock_buffer(bh); | |
654 | if (test_clear_buffer_dirty(bh)) { | |
655 | bh->b_end_io = end_buffer_write_sync; | |
656 | submit_bh(WRITE, bh); | |
657 | } else { | |
658 | unlock_buffer(bh); | |
659 | brelse(bh); | |
660 | } | |
661 | gfs2_log_lock(sdp); | |
662 | } | |
663 | list_splice(&written, &sdp->sd_log_le_ordered); | |
664 | gfs2_log_unlock(sdp); | |
665 | } | |
666 | ||
667 | static void gfs2_ordered_wait(struct gfs2_sbd *sdp) | |
668 | { | |
669 | struct gfs2_bufdata *bd; | |
670 | struct buffer_head *bh; | |
671 | ||
672 | gfs2_log_lock(sdp); | |
673 | while (!list_empty(&sdp->sd_log_le_ordered)) { | |
674 | bd = list_entry(sdp->sd_log_le_ordered.prev, struct gfs2_bufdata, bd_le.le_list); | |
675 | bh = bd->bd_bh; | |
676 | if (buffer_locked(bh)) { | |
677 | get_bh(bh); | |
678 | gfs2_log_unlock(sdp); | |
679 | wait_on_buffer(bh); | |
680 | brelse(bh); | |
681 | gfs2_log_lock(sdp); | |
682 | continue; | |
683 | } | |
684 | list_del_init(&bd->bd_le.le_list); | |
685 | } | |
686 | gfs2_log_unlock(sdp); | |
687 | } | |
688 | ||
b3b94faa | 689 | /** |
b09e593d | 690 | * gfs2_log_flush - flush incore transaction(s) |
b3b94faa DT |
691 | * @sdp: the filesystem |
692 | * @gl: The glock structure to flush. If NULL, flush the whole incore log | |
693 | * | |
694 | */ | |
695 | ||
b09e593d | 696 | void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl) |
b3b94faa DT |
697 | { |
698 | struct gfs2_ail *ai; | |
699 | ||
484adff8 | 700 | down_write(&sdp->sd_log_flush_lock); |
f55ab26a SW |
701 | |
702 | if (gl) { | |
703 | gfs2_log_lock(sdp); | |
704 | if (list_empty(&gl->gl_le.le_list)) { | |
705 | gfs2_log_unlock(sdp); | |
484adff8 | 706 | up_write(&sdp->sd_log_flush_lock); |
f55ab26a SW |
707 | return; |
708 | } | |
709 | gfs2_log_unlock(sdp); | |
710 | } | |
711 | ||
b09e593d SW |
712 | ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL); |
713 | INIT_LIST_HEAD(&ai->ai_ail1_list); | |
714 | INIT_LIST_HEAD(&ai->ai_ail2_list); | |
b3b94faa | 715 | |
16615be1 SW |
716 | if (sdp->sd_log_num_buf != sdp->sd_log_commited_buf) { |
717 | printk(KERN_INFO "GFS2: log buf %u %u\n", sdp->sd_log_num_buf, | |
718 | sdp->sd_log_commited_buf); | |
719 | gfs2_assert_withdraw(sdp, 0); | |
720 | } | |
721 | if (sdp->sd_log_num_databuf != sdp->sd_log_commited_databuf) { | |
722 | printk(KERN_INFO "GFS2: log databuf %u %u\n", | |
723 | sdp->sd_log_num_databuf, sdp->sd_log_commited_databuf); | |
724 | gfs2_assert_withdraw(sdp, 0); | |
725 | } | |
b3b94faa DT |
726 | gfs2_assert_withdraw(sdp, |
727 | sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke); | |
728 | ||
b3b94faa DT |
729 | sdp->sd_log_flush_head = sdp->sd_log_head; |
730 | sdp->sd_log_flush_wrapped = 0; | |
731 | ai->ai_first = sdp->sd_log_flush_head; | |
732 | ||
d7b616e2 | 733 | gfs2_ordered_write(sdp); |
b3b94faa | 734 | lops_before_commit(sdp); |
d7b616e2 SW |
735 | gfs2_ordered_wait(sdp); |
736 | ||
16615be1 | 737 | if (sdp->sd_log_head != sdp->sd_log_flush_head) |
b3b94faa | 738 | log_flush_commit(sdp); |
2332c443 RP |
739 | else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){ |
740 | gfs2_log_lock(sdp); | |
741 | sdp->sd_log_blks_free--; /* Adjust for unreserved buffer */ | |
742 | gfs2_log_unlock(sdp); | |
b3b94faa | 743 | log_write_header(sdp, 0, PULL); |
2332c443 | 744 | } |
b3b94faa | 745 | lops_after_commit(sdp, ai); |
b09e593d | 746 | |
fe1a698f SW |
747 | gfs2_log_lock(sdp); |
748 | sdp->sd_log_head = sdp->sd_log_flush_head; | |
faa31ce8 SW |
749 | sdp->sd_log_blks_reserved = 0; |
750 | sdp->sd_log_commited_buf = 0; | |
2332c443 | 751 | sdp->sd_log_commited_databuf = 0; |
faa31ce8 | 752 | sdp->sd_log_commited_revoke = 0; |
b3b94faa | 753 | |
b3b94faa DT |
754 | if (!list_empty(&ai->ai_ail1_list)) { |
755 | list_add(&ai->ai_list, &sdp->sd_ail1_list); | |
756 | ai = NULL; | |
757 | } | |
758 | gfs2_log_unlock(sdp); | |
759 | ||
b3b94faa | 760 | sdp->sd_vfs->s_dirt = 0; |
484adff8 | 761 | up_write(&sdp->sd_log_flush_lock); |
b3b94faa DT |
762 | |
763 | kfree(ai); | |
764 | } | |
765 | ||
766 | static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr) | |
767 | { | |
2332c443 | 768 | unsigned int reserved; |
b3b94faa DT |
769 | unsigned int old; |
770 | ||
771 | gfs2_log_lock(sdp); | |
772 | ||
773 | sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm; | |
2332c443 RP |
774 | sdp->sd_log_commited_databuf += tr->tr_num_databuf_new - |
775 | tr->tr_num_databuf_rm; | |
776 | gfs2_assert_withdraw(sdp, (((int)sdp->sd_log_commited_buf) >= 0) || | |
777 | (((int)sdp->sd_log_commited_databuf) >= 0)); | |
b3b94faa DT |
778 | sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm; |
779 | gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0); | |
2332c443 | 780 | reserved = calc_reserved(sdp); |
b3b94faa DT |
781 | old = sdp->sd_log_blks_free; |
782 | sdp->sd_log_blks_free += tr->tr_reserved - | |
783 | (reserved - sdp->sd_log_blks_reserved); | |
784 | ||
b09e593d | 785 | gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free >= old); |
2332c443 RP |
786 | gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <= |
787 | sdp->sd_jdesc->jd_blocks); | |
b3b94faa DT |
788 | |
789 | sdp->sd_log_blks_reserved = reserved; | |
790 | ||
791 | gfs2_log_unlock(sdp); | |
792 | } | |
793 | ||
794 | /** | |
795 | * gfs2_log_commit - Commit a transaction to the log | |
796 | * @sdp: the filesystem | |
797 | * @tr: the transaction | |
798 | * | |
799 | * Returns: errno | |
800 | */ | |
801 | ||
802 | void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) | |
803 | { | |
804 | log_refund(sdp, tr); | |
805 | lops_incore_commit(sdp, tr); | |
806 | ||
807 | sdp->sd_vfs->s_dirt = 1; | |
484adff8 | 808 | up_read(&sdp->sd_log_flush_lock); |
b3b94faa | 809 | |
b3b94faa | 810 | gfs2_log_lock(sdp); |
b004157a SW |
811 | if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks)) |
812 | wake_up_process(sdp->sd_logd_process); | |
813 | gfs2_log_unlock(sdp); | |
b3b94faa DT |
814 | } |
815 | ||
816 | /** | |
817 | * gfs2_log_shutdown - write a shutdown header into a journal | |
818 | * @sdp: the filesystem | |
819 | * | |
820 | */ | |
821 | ||
822 | void gfs2_log_shutdown(struct gfs2_sbd *sdp) | |
823 | { | |
484adff8 | 824 | down_write(&sdp->sd_log_flush_lock); |
b3b94faa | 825 | |
b3b94faa DT |
826 | gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved); |
827 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_gl); | |
828 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf); | |
829 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); | |
830 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg); | |
831 | gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf); | |
832 | gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list)); | |
833 | ||
834 | sdp->sd_log_flush_head = sdp->sd_log_head; | |
835 | sdp->sd_log_flush_wrapped = 0; | |
836 | ||
2332c443 RP |
837 | log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT, |
838 | (sdp->sd_log_tail == current_tail(sdp)) ? 0 : PULL); | |
b3b94faa | 839 | |
a74604be SW |
840 | gfs2_assert_warn(sdp, sdp->sd_log_blks_free == sdp->sd_jdesc->jd_blocks); |
841 | gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail); | |
842 | gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list)); | |
b3b94faa DT |
843 | |
844 | sdp->sd_log_head = sdp->sd_log_flush_head; | |
b3b94faa DT |
845 | sdp->sd_log_tail = sdp->sd_log_head; |
846 | ||
484adff8 | 847 | up_write(&sdp->sd_log_flush_lock); |
b3b94faa DT |
848 | } |
849 | ||
a25311c8 SW |
850 | |
851 | /** | |
852 | * gfs2_meta_syncfs - sync all the buffers in a filesystem | |
853 | * @sdp: the filesystem | |
854 | * | |
855 | */ | |
856 | ||
857 | void gfs2_meta_syncfs(struct gfs2_sbd *sdp) | |
858 | { | |
859 | gfs2_log_flush(sdp, NULL); | |
860 | for (;;) { | |
861 | gfs2_ail1_start(sdp, DIO_ALL); | |
862 | if (gfs2_ail1_empty(sdp, DIO_ALL)) | |
863 | break; | |
864 | msleep(10); | |
865 | } | |
866 | } | |
867 |