blob: 161ab6f2058ee585ad46dc08f6caac9b43f31b48 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Bob Petersonda6dd402007-12-11 18:49:21 -06003 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
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>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050015#include <linux/gfs2_ondisk.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050016#include <linux/crc32.h>
Fabio Massimo Di Nitto7d308592006-09-19 07:56:29 +020017#include <linux/lm_interface.h>
Steven Whitehousea25311c2006-11-23 11:06:35 -050018#include <linux/delay.h>
Steven Whitehouseec69b182007-11-09 10:01:41 +000019#include <linux/kthread.h>
20#include <linux/freezer.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000021
22#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050023#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000024#include "bmap.h"
25#include "glock.h"
26#include "log.h"
27#include "lops.h"
28#include "meta_io.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050029#include "util.h"
Steven Whitehouse71b86f52006-03-28 14:14:04 -050030#include "dir.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000031
32#define PULL 1
33
David Teiglandb3b94fa2006-01-16 16:50:04 +000034/**
35 * gfs2_struct2blk - compute stuff
36 * @sdp: the filesystem
37 * @nstruct: the number of structures
38 * @ssize: the size of the structures
39 *
40 * Compute the number of log descriptor blocks needed to hold a certain number
41 * of structures of a certain size.
42 *
43 * Returns: the number of blocks needed (minimum is always 1)
44 */
45
46unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
47 unsigned int ssize)
48{
49 unsigned int blks;
50 unsigned int first, second;
51
52 blks = 1;
Steven Whitehousefaa31ce2006-09-13 11:13:27 -040053 first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / ssize;
David Teiglandb3b94fa2006-01-16 16:50:04 +000054
55 if (nstruct > first) {
Steven Whitehouse568f4c92006-02-27 12:00:42 -050056 second = (sdp->sd_sb.sb_bsize -
57 sizeof(struct gfs2_meta_header)) / ssize;
Steven Whitehouse5c676f62006-02-27 17:23:27 -050058 blks += DIV_ROUND_UP(nstruct - first, second);
David Teiglandb3b94fa2006-01-16 16:50:04 +000059 }
60
61 return blks;
62}
63
Steven Whitehouseddacfaf2006-10-03 11:10:41 -040064/**
Steven Whitehouse1e1a3d02007-08-27 09:45:26 +010065 * gfs2_remove_from_ail - Remove an entry from the ail lists, updating counters
66 * @mapping: The associated mapping (maybe NULL)
67 * @bd: The gfs2_bufdata to remove
68 *
69 * The log lock _must_ be held when calling this function
70 *
71 */
72
Steven Whitehousef91a0d32007-10-15 16:29:05 +010073void gfs2_remove_from_ail(struct gfs2_bufdata *bd)
Steven Whitehouse1e1a3d02007-08-27 09:45:26 +010074{
75 bd->bd_ail = NULL;
Steven Whitehouse1ad38c42007-09-03 11:01:33 +010076 list_del_init(&bd->bd_ail_st_list);
77 list_del_init(&bd->bd_ail_gl_list);
Steven Whitehouse1e1a3d02007-08-27 09:45:26 +010078 atomic_dec(&bd->bd_gl->gl_ail_count);
Steven Whitehouse1e1a3d02007-08-27 09:45:26 +010079 brelse(bd->bd_bh);
80}
81
82/**
Steven Whitehouseddacfaf2006-10-03 11:10:41 -040083 * 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
89static 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
Steven Whitehouseddacfaf2006-10-03 11:10:41 -040095 do {
96 retry = 0;
97
98 list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list,
99 bd_ail_st_list) {
100 bh = bd->bd_bh;
101
102 gfs2_assert(sdp, bd->bd_ail == ai);
103
104 if (!buffer_busy(bh)) {
Steven Whitehouse16615be2007-09-17 10:59:52 +0100105 if (!buffer_uptodate(bh))
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400106 gfs2_io_error_bh(sdp, bh);
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400107 list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
108 continue;
109 }
110
111 if (!buffer_dirty(bh))
112 continue;
113
114 list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list);
115
Steven Whitehouse16615be2007-09-17 10:59:52 +0100116 get_bh(bh);
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400117 gfs2_log_unlock(sdp);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100118 lock_buffer(bh);
119 if (test_clear_buffer_dirty(bh)) {
120 bh->b_end_io = end_buffer_write_sync;
121 submit_bh(WRITE, bh);
122 } else {
123 unlock_buffer(bh);
124 brelse(bh);
125 }
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400126 gfs2_log_lock(sdp);
127
128 retry = 1;
129 break;
130 }
131 } while (retry);
132}
133
134/**
135 * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced
136 * @sdp: the filesystem
137 * @ai: the AIL entry
138 *
139 */
140
141static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags)
142{
143 struct gfs2_bufdata *bd, *s;
144 struct buffer_head *bh;
145
146 list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list,
147 bd_ail_st_list) {
148 bh = bd->bd_bh;
149
150 gfs2_assert(sdp, bd->bd_ail == ai);
151
152 if (buffer_busy(bh)) {
153 if (flags & DIO_ALL)
154 continue;
155 else
156 break;
157 }
158
159 if (!buffer_uptodate(bh))
160 gfs2_io_error_bh(sdp, bh);
161
162 list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
163 }
164
165 return list_empty(&ai->ai_ail1_list);
166}
167
Steven Whitehousea25311c2006-11-23 11:06:35 -0500168static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000169{
Bob Peterson693ddea2007-07-24 14:07:33 -0500170 struct list_head *head;
Steven Whitehousecd915492006-09-04 12:49:07 -0400171 u64 sync_gen;
Steven Whitehouse74669412006-09-19 11:17:38 -0400172 struct list_head *first;
173 struct gfs2_ail *first_ai, *ai, *tmp;
174 int done = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000175
176 gfs2_log_lock(sdp);
Bob Peterson693ddea2007-07-24 14:07:33 -0500177 head = &sdp->sd_ail1_list;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000178 if (list_empty(head)) {
179 gfs2_log_unlock(sdp);
180 return;
181 }
182 sync_gen = sdp->sd_ail_sync_gen++;
183
184 first = head->prev;
185 first_ai = list_entry(first, struct gfs2_ail, ai_list);
186 first_ai->ai_sync_gen = sync_gen;
Steven Whitehouse74669412006-09-19 11:17:38 -0400187 gfs2_ail1_start_one(sdp, first_ai); /* This may drop log lock */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000188
189 if (flags & DIO_ALL)
190 first = NULL;
191
Steven Whitehouse74669412006-09-19 11:17:38 -0400192 while(!done) {
Steven Whitehouse484adff2006-03-29 09:12:12 -0500193 if (first && (head->prev != first ||
194 gfs2_ail1_empty_one(sdp, first_ai, 0)))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000195 break;
196
Steven Whitehouse74669412006-09-19 11:17:38 -0400197 done = 1;
198 list_for_each_entry_safe_reverse(ai, tmp, head, ai_list) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000199 if (ai->ai_sync_gen >= sync_gen)
200 continue;
201 ai->ai_sync_gen = sync_gen;
Steven Whitehouse74669412006-09-19 11:17:38 -0400202 gfs2_ail1_start_one(sdp, ai); /* This may drop log lock */
203 done = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000204 break;
205 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000206 }
207
208 gfs2_log_unlock(sdp);
209}
210
Steven Whitehouseec69b182007-11-09 10:01:41 +0000211static int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000212{
213 struct gfs2_ail *ai, *s;
214 int ret;
215
216 gfs2_log_lock(sdp);
217
218 list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) {
219 if (gfs2_ail1_empty_one(sdp, ai, flags))
220 list_move(&ai->ai_list, &sdp->sd_ail2_list);
221 else if (!(flags & DIO_ALL))
222 break;
223 }
224
225 ret = list_empty(&sdp->sd_ail1_list);
226
227 gfs2_log_unlock(sdp);
228
229 return ret;
230}
231
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400232
233/**
234 * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced
235 * @sdp: the filesystem
236 * @ai: the AIL entry
237 *
238 */
239
240static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
241{
242 struct list_head *head = &ai->ai_ail2_list;
243 struct gfs2_bufdata *bd;
244
245 while (!list_empty(head)) {
246 bd = list_entry(head->prev, struct gfs2_bufdata,
247 bd_ail_st_list);
248 gfs2_assert(sdp, bd->bd_ail == ai);
Steven Whitehousef91a0d32007-10-15 16:29:05 +0100249 gfs2_remove_from_ail(bd);
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400250 }
251}
252
David Teiglandb3b94fa2006-01-16 16:50:04 +0000253static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
254{
255 struct gfs2_ail *ai, *safe;
256 unsigned int old_tail = sdp->sd_log_tail;
257 int wrap = (new_tail < old_tail);
258 int a, b, rm;
259
260 gfs2_log_lock(sdp);
261
262 list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) {
263 a = (old_tail <= ai->ai_first);
264 b = (ai->ai_first < new_tail);
265 rm = (wrap) ? (a || b) : (a && b);
266 if (!rm)
267 continue;
268
269 gfs2_ail2_empty_one(sdp, ai);
270 list_del(&ai->ai_list);
271 gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list));
272 gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list));
273 kfree(ai);
274 }
275
276 gfs2_log_unlock(sdp);
277}
278
279/**
280 * gfs2_log_reserve - Make a log reservation
281 * @sdp: The GFS2 superblock
282 * @blks: The number of blocks to reserve
283 *
Steven Whitehouse89918642007-06-01 15:19:33 +0100284 * Note that we never give out the last few blocks of the journal. Thats
Robert Peterson2332c442007-06-18 14:50:20 -0500285 * due to the fact that there is a small number of header blocks
Steven Whitehouseb0041572006-11-23 10:51:34 -0500286 * associated with each log flush. The exact number can't be known until
287 * flush time, so we ensure that we have just enough free blocks at all
288 * times to avoid running out during a log flush.
289 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000290 * Returns: errno
291 */
292
293int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
294{
David Teiglandb3b94fa2006-01-16 16:50:04 +0000295 unsigned int try = 0;
Steven Whitehouse89918642007-06-01 15:19:33 +0100296 unsigned reserved_blks = 6 * (4096 / sdp->sd_vfs->s_blocksize);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000297
298 if (gfs2_assert_warn(sdp, blks) ||
299 gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))
300 return -EINVAL;
301
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500302 mutex_lock(&sdp->sd_log_reserve_mutex);
Steven Whitehouse484adff2006-03-29 09:12:12 -0500303 gfs2_log_lock(sdp);
Steven Whitehousefd041f02007-11-08 14:55:03 +0000304 while(atomic_read(&sdp->sd_log_blks_free) <= (blks + reserved_blks)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000305 gfs2_log_unlock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000306 gfs2_ail1_empty(sdp, 0);
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400307 gfs2_log_flush(sdp, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000308
309 if (try++)
310 gfs2_ail1_start(sdp, 0);
Steven Whitehouse484adff2006-03-29 09:12:12 -0500311 gfs2_log_lock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000312 }
Steven Whitehousefd041f02007-11-08 14:55:03 +0000313 atomic_sub(blks, &sdp->sd_log_blks_free);
Steven Whitehouse484adff2006-03-29 09:12:12 -0500314 gfs2_log_unlock(sdp);
315 mutex_unlock(&sdp->sd_log_reserve_mutex);
316
317 down_read(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000318
319 return 0;
320}
321
322/**
323 * gfs2_log_release - Release a given number of log blocks
324 * @sdp: The GFS2 superblock
325 * @blks: The number of blocks
326 *
327 */
328
329void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
330{
David Teiglandb3b94fa2006-01-16 16:50:04 +0000331
332 gfs2_log_lock(sdp);
Steven Whitehousefd041f02007-11-08 14:55:03 +0000333 atomic_add(blks, &sdp->sd_log_blks_free);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000334 gfs2_assert_withdraw(sdp,
Steven Whitehousefd041f02007-11-08 14:55:03 +0000335 atomic_read(&sdp->sd_log_blks_free) <= sdp->sd_jdesc->jd_blocks);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000336 gfs2_log_unlock(sdp);
Steven Whitehouseed386502006-04-07 16:28:07 -0400337 up_read(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000338}
339
Steven Whitehousecd915492006-09-04 12:49:07 -0400340static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000341{
Bob Petersonda6dd402007-12-11 18:49:21 -0600342 struct gfs2_journal_extent *je;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000343
Bob Petersonda6dd402007-12-11 18:49:21 -0600344 list_for_each_entry(je, &sdp->sd_jdesc->extent_list, extent_list) {
345 if (lbn >= je->lblock && lbn < je->lblock + je->blocks)
Steven Whitehouseff91cc92007-12-14 14:04:34 +0000346 return je->dblock + lbn - je->lblock;
Bob Petersonda6dd402007-12-11 18:49:21 -0600347 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000348
Bob Petersonda6dd402007-12-11 18:49:21 -0600349 return -1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000350}
351
352/**
353 * log_distance - Compute distance between two journal blocks
354 * @sdp: The GFS2 superblock
355 * @newer: The most recent journal block of the pair
356 * @older: The older journal block of the pair
357 *
358 * Compute the distance (in the journal direction) between two
359 * blocks in the journal
360 *
361 * Returns: the distance in blocks
362 */
363
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400364static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000365 unsigned int older)
366{
367 int dist;
368
369 dist = newer - older;
370 if (dist < 0)
371 dist += sdp->sd_jdesc->jd_blocks;
372
373 return dist;
374}
375
Robert Peterson2332c442007-06-18 14:50:20 -0500376/**
377 * calc_reserved - Calculate the number of blocks to reserve when
378 * refunding a transaction's unused buffers.
379 * @sdp: The GFS2 superblock
380 *
381 * This is complex. We need to reserve room for all our currently used
382 * metadata buffers (e.g. normal file I/O rewriting file time stamps) and
383 * all our journaled data buffers for journaled files (e.g. files in the
384 * meta_fs like rindex, or files for which chattr +j was done.)
385 * If we don't reserve enough space, gfs2_log_refund and gfs2_log_flush
386 * will count it as free space (sd_log_blks_free) and corruption will follow.
387 *
388 * We can have metadata bufs and jdata bufs in the same journal. So each
389 * type gets its own log header, for which we need to reserve a block.
390 * In fact, each type has the potential for needing more than one header
391 * in cases where we have more buffers than will fit on a journal page.
392 * Metadata journal entries take up half the space of journaled buffer entries.
393 * Thus, metadata entries have buf_limit (502) and journaled buffers have
394 * databuf_limit (251) before they cause a wrap around.
395 *
396 * Also, we need to reserve blocks for revoke journal entries and one for an
397 * overall header for the lot.
398 *
399 * Returns: the number of blocks reserved
400 */
401static unsigned int calc_reserved(struct gfs2_sbd *sdp)
402{
403 unsigned int reserved = 0;
404 unsigned int mbuf_limit, metabufhdrs_needed;
405 unsigned int dbuf_limit, databufhdrs_needed;
406 unsigned int revokes = 0;
407
408 mbuf_limit = buf_limit(sdp);
409 metabufhdrs_needed = (sdp->sd_log_commited_buf +
410 (mbuf_limit - 1)) / mbuf_limit;
411 dbuf_limit = databuf_limit(sdp);
412 databufhdrs_needed = (sdp->sd_log_commited_databuf +
413 (dbuf_limit - 1)) / dbuf_limit;
414
415 if (sdp->sd_log_commited_revoke)
416 revokes = gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
417 sizeof(u64));
418
419 reserved = sdp->sd_log_commited_buf + metabufhdrs_needed +
420 sdp->sd_log_commited_databuf + databufhdrs_needed +
421 revokes;
422 /* One for the overall header */
423 if (reserved)
424 reserved++;
425 return reserved;
426}
427
David Teiglandb3b94fa2006-01-16 16:50:04 +0000428static unsigned int current_tail(struct gfs2_sbd *sdp)
429{
430 struct gfs2_ail *ai;
431 unsigned int tail;
432
433 gfs2_log_lock(sdp);
434
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400435 if (list_empty(&sdp->sd_ail1_list)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000436 tail = sdp->sd_log_head;
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400437 } else {
438 ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail, ai_list);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000439 tail = ai->ai_first;
440 }
441
442 gfs2_log_unlock(sdp);
443
444 return tail;
445}
446
Steven Whitehouse16615be2007-09-17 10:59:52 +0100447void gfs2_log_incr_head(struct gfs2_sbd *sdp)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000448{
449 if (sdp->sd_log_flush_head == sdp->sd_log_tail)
Steven Whitehouse16615be2007-09-17 10:59:52 +0100450 BUG_ON(sdp->sd_log_flush_head != sdp->sd_log_head);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000451
452 if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) {
453 sdp->sd_log_flush_head = 0;
454 sdp->sd_log_flush_wrapped = 1;
455 }
456}
457
458/**
Steven Whitehouse16615be2007-09-17 10:59:52 +0100459 * gfs2_log_write_endio - End of I/O for a log buffer
460 * @bh: The buffer head
461 * @uptodate: I/O Status
462 *
463 */
464
465static void gfs2_log_write_endio(struct buffer_head *bh, int uptodate)
466{
467 struct gfs2_sbd *sdp = bh->b_private;
468 bh->b_private = NULL;
469
470 end_buffer_write_sync(bh, uptodate);
471 if (atomic_dec_and_test(&sdp->sd_log_in_flight))
472 wake_up(&sdp->sd_log_flush_wait);
473}
474
475/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000476 * gfs2_log_get_buf - Get and initialize a buffer to use for log control data
477 * @sdp: The GFS2 superblock
478 *
479 * Returns: the buffer_head
480 */
481
482struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp)
483{
Steven Whitehousecd915492006-09-04 12:49:07 -0400484 u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000485 struct buffer_head *bh;
486
Steven Whitehouse16615be2007-09-17 10:59:52 +0100487 bh = sb_getblk(sdp->sd_vfs, blkno);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000488 lock_buffer(bh);
489 memset(bh->b_data, 0, bh->b_size);
490 set_buffer_uptodate(bh);
491 clear_buffer_dirty(bh);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100492 gfs2_log_incr_head(sdp);
493 atomic_inc(&sdp->sd_log_in_flight);
494 bh->b_private = sdp;
495 bh->b_end_io = gfs2_log_write_endio;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000496
497 return bh;
498}
499
500/**
Steven Whitehouse16615be2007-09-17 10:59:52 +0100501 * gfs2_fake_write_endio -
502 * @bh: The buffer head
503 * @uptodate: The I/O Status
504 *
505 */
506
507static void gfs2_fake_write_endio(struct buffer_head *bh, int uptodate)
508{
509 struct buffer_head *real_bh = bh->b_private;
Steven Whitehouse5a60c532007-09-26 09:39:31 +0100510 struct gfs2_bufdata *bd = real_bh->b_private;
511 struct gfs2_sbd *sdp = bd->bd_gl->gl_sbd;
Steven Whitehouse16615be2007-09-17 10:59:52 +0100512
513 end_buffer_write_sync(bh, uptodate);
514 free_buffer_head(bh);
515 unlock_buffer(real_bh);
516 brelse(real_bh);
517 if (atomic_dec_and_test(&sdp->sd_log_in_flight))
518 wake_up(&sdp->sd_log_flush_wait);
519}
520
521/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000522 * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log
523 * @sdp: the filesystem
524 * @data: the data the buffer_head should point to
525 *
526 * Returns: the log buffer descriptor
527 */
528
529struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
530 struct buffer_head *real)
531{
Steven Whitehousecd915492006-09-04 12:49:07 -0400532 u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000533 struct buffer_head *bh;
534
Steven Whitehouse16615be2007-09-17 10:59:52 +0100535 bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000536 atomic_set(&bh->b_count, 1);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100537 bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate) | (1 << BH_Lock);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000538 set_bh_page(bh, real->b_page, bh_offset(real));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000539 bh->b_blocknr = blkno;
540 bh->b_size = sdp->sd_sb.sb_bsize;
541 bh->b_bdev = sdp->sd_vfs->s_bdev;
Steven Whitehouse16615be2007-09-17 10:59:52 +0100542 bh->b_private = real;
543 bh->b_end_io = gfs2_fake_write_endio;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000544
Steven Whitehouse16615be2007-09-17 10:59:52 +0100545 gfs2_log_incr_head(sdp);
546 atomic_inc(&sdp->sd_log_in_flight);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000547
548 return bh;
549}
550
Robert Peterson2332c442007-06-18 14:50:20 -0500551static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000552{
553 unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail);
554
555 ail2_empty(sdp, new_tail);
556
557 gfs2_log_lock(sdp);
Steven Whitehousefd041f02007-11-08 14:55:03 +0000558 atomic_add(dist, &sdp->sd_log_blks_free);
559 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <= sdp->sd_jdesc->jd_blocks);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000560 gfs2_log_unlock(sdp);
561
562 sdp->sd_log_tail = new_tail;
563}
564
565/**
566 * log_write_header - Get and initialize a journal header buffer
567 * @sdp: The GFS2 superblock
568 *
569 * Returns: the initialized log buffer descriptor
570 */
571
Steven Whitehousecd915492006-09-04 12:49:07 -0400572static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000573{
Steven Whitehousecd915492006-09-04 12:49:07 -0400574 u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000575 struct buffer_head *bh;
576 struct gfs2_log_header *lh;
577 unsigned int tail;
Steven Whitehousecd915492006-09-04 12:49:07 -0400578 u32 hash;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000579
David Teiglandb3b94fa2006-01-16 16:50:04 +0000580 bh = sb_getblk(sdp->sd_vfs, blkno);
581 lock_buffer(bh);
582 memset(bh->b_data, 0, bh->b_size);
583 set_buffer_uptodate(bh);
584 clear_buffer_dirty(bh);
585 unlock_buffer(bh);
586
587 gfs2_ail1_empty(sdp, 0);
588 tail = current_tail(sdp);
589
590 lh = (struct gfs2_log_header *)bh->b_data;
591 memset(lh, 0, sizeof(struct gfs2_log_header));
592 lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
Steven Whitehousee3167de2006-03-30 15:46:23 -0500593 lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH);
594 lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH);
Steven Whitehousee0f2bf72006-07-17 09:36:28 -0400595 lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++);
596 lh->lh_flags = cpu_to_be32(flags);
597 lh->lh_tail = cpu_to_be32(tail);
598 lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000599 hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header));
600 lh->lh_hash = cpu_to_be32(hash);
601
602 set_buffer_dirty(bh);
603 if (sync_dirty_buffer(bh))
604 gfs2_io_error_bh(sdp, bh);
605 brelse(bh);
606
607 if (sdp->sd_log_tail != tail)
Robert Peterson2332c442007-06-18 14:50:20 -0500608 log_pull_tail(sdp, tail);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000609 else
610 gfs2_assert_withdraw(sdp, !pull);
611
612 sdp->sd_log_idle = (tail == sdp->sd_log_flush_head);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100613 gfs2_log_incr_head(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000614}
615
616static void log_flush_commit(struct gfs2_sbd *sdp)
617{
Steven Whitehouse16615be2007-09-17 10:59:52 +0100618 DEFINE_WAIT(wait);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000619
Steven Whitehouse16615be2007-09-17 10:59:52 +0100620 if (atomic_read(&sdp->sd_log_in_flight)) {
621 do {
622 prepare_to_wait(&sdp->sd_log_flush_wait, &wait,
623 TASK_UNINTERRUPTIBLE);
624 if (atomic_read(&sdp->sd_log_in_flight))
625 io_schedule();
626 } while(atomic_read(&sdp->sd_log_in_flight));
627 finish_wait(&sdp->sd_log_flush_wait, &wait);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000628 }
629
Steven Whitehouse16615be2007-09-17 10:59:52 +0100630 log_write_header(sdp, 0, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000631}
632
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100633static void gfs2_ordered_write(struct gfs2_sbd *sdp)
634{
635 struct gfs2_bufdata *bd;
636 struct buffer_head *bh;
637 LIST_HEAD(written);
638
639 gfs2_log_lock(sdp);
640 while (!list_empty(&sdp->sd_log_le_ordered)) {
641 bd = list_entry(sdp->sd_log_le_ordered.next, struct gfs2_bufdata, bd_le.le_list);
642 list_move(&bd->bd_le.le_list, &written);
643 bh = bd->bd_bh;
644 if (!buffer_dirty(bh))
645 continue;
646 get_bh(bh);
647 gfs2_log_unlock(sdp);
648 lock_buffer(bh);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100649 if (buffer_mapped(bh) && test_clear_buffer_dirty(bh)) {
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100650 bh->b_end_io = end_buffer_write_sync;
651 submit_bh(WRITE, bh);
652 } else {
653 unlock_buffer(bh);
654 brelse(bh);
655 }
656 gfs2_log_lock(sdp);
657 }
658 list_splice(&written, &sdp->sd_log_le_ordered);
659 gfs2_log_unlock(sdp);
660}
661
662static void gfs2_ordered_wait(struct gfs2_sbd *sdp)
663{
664 struct gfs2_bufdata *bd;
665 struct buffer_head *bh;
666
667 gfs2_log_lock(sdp);
668 while (!list_empty(&sdp->sd_log_le_ordered)) {
669 bd = list_entry(sdp->sd_log_le_ordered.prev, struct gfs2_bufdata, bd_le.le_list);
670 bh = bd->bd_bh;
671 if (buffer_locked(bh)) {
672 get_bh(bh);
673 gfs2_log_unlock(sdp);
674 wait_on_buffer(bh);
675 brelse(bh);
676 gfs2_log_lock(sdp);
677 continue;
678 }
679 list_del_init(&bd->bd_le.le_list);
680 }
681 gfs2_log_unlock(sdp);
682}
683
David Teiglandb3b94fa2006-01-16 16:50:04 +0000684/**
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400685 * gfs2_log_flush - flush incore transaction(s)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000686 * @sdp: the filesystem
687 * @gl: The glock structure to flush. If NULL, flush the whole incore log
688 *
689 */
690
Steven Whitehouse2bcd6102007-11-08 14:25:12 +0000691void __gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000692{
693 struct gfs2_ail *ai;
694
Steven Whitehouse484adff2006-03-29 09:12:12 -0500695 down_write(&sdp->sd_log_flush_lock);
Steven Whitehousef55ab262006-02-21 12:51:39 +0000696
Steven Whitehouse2bcd6102007-11-08 14:25:12 +0000697 /* Log might have been flushed while we waited for the flush lock */
698 if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) {
699 up_write(&sdp->sd_log_flush_lock);
700 return;
Steven Whitehousef55ab262006-02-21 12:51:39 +0000701 }
702
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400703 ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL);
704 INIT_LIST_HEAD(&ai->ai_ail1_list);
705 INIT_LIST_HEAD(&ai->ai_ail2_list);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000706
Steven Whitehouse16615be2007-09-17 10:59:52 +0100707 if (sdp->sd_log_num_buf != sdp->sd_log_commited_buf) {
708 printk(KERN_INFO "GFS2: log buf %u %u\n", sdp->sd_log_num_buf,
709 sdp->sd_log_commited_buf);
710 gfs2_assert_withdraw(sdp, 0);
711 }
712 if (sdp->sd_log_num_databuf != sdp->sd_log_commited_databuf) {
713 printk(KERN_INFO "GFS2: log databuf %u %u\n",
714 sdp->sd_log_num_databuf, sdp->sd_log_commited_databuf);
715 gfs2_assert_withdraw(sdp, 0);
716 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000717 gfs2_assert_withdraw(sdp,
718 sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke);
719
David Teiglandb3b94fa2006-01-16 16:50:04 +0000720 sdp->sd_log_flush_head = sdp->sd_log_head;
721 sdp->sd_log_flush_wrapped = 0;
722 ai->ai_first = sdp->sd_log_flush_head;
723
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100724 gfs2_ordered_write(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000725 lops_before_commit(sdp);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100726 gfs2_ordered_wait(sdp);
727
Steven Whitehouse16615be2007-09-17 10:59:52 +0100728 if (sdp->sd_log_head != sdp->sd_log_flush_head)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000729 log_flush_commit(sdp);
Robert Peterson2332c442007-06-18 14:50:20 -0500730 else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){
731 gfs2_log_lock(sdp);
Steven Whitehousefd041f02007-11-08 14:55:03 +0000732 atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
Robert Peterson2332c442007-06-18 14:50:20 -0500733 gfs2_log_unlock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000734 log_write_header(sdp, 0, PULL);
Robert Peterson2332c442007-06-18 14:50:20 -0500735 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000736 lops_after_commit(sdp, ai);
Steven Whitehousefe1a6982006-10-11 13:34:59 -0400737
738 gfs2_log_lock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000739 sdp->sd_log_head = sdp->sd_log_flush_head;
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400740 sdp->sd_log_blks_reserved = 0;
741 sdp->sd_log_commited_buf = 0;
Robert Peterson2332c442007-06-18 14:50:20 -0500742 sdp->sd_log_commited_databuf = 0;
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400743 sdp->sd_log_commited_revoke = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000744
David Teiglandb3b94fa2006-01-16 16:50:04 +0000745 if (!list_empty(&ai->ai_ail1_list)) {
746 list_add(&ai->ai_list, &sdp->sd_ail1_list);
747 ai = NULL;
748 }
749 gfs2_log_unlock(sdp);
750
David Teiglandb3b94fa2006-01-16 16:50:04 +0000751 sdp->sd_vfs->s_dirt = 0;
Steven Whitehouse484adff2006-03-29 09:12:12 -0500752 up_write(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000753
754 kfree(ai);
755}
756
757static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
758{
Robert Peterson2332c442007-06-18 14:50:20 -0500759 unsigned int reserved;
Steven Whitehouseac39aad2008-01-10 14:49:43 +0000760 unsigned int unused;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000761
762 gfs2_log_lock(sdp);
763
764 sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm;
Robert Peterson2332c442007-06-18 14:50:20 -0500765 sdp->sd_log_commited_databuf += tr->tr_num_databuf_new -
766 tr->tr_num_databuf_rm;
767 gfs2_assert_withdraw(sdp, (((int)sdp->sd_log_commited_buf) >= 0) ||
768 (((int)sdp->sd_log_commited_databuf) >= 0));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000769 sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
770 gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0);
Robert Peterson2332c442007-06-18 14:50:20 -0500771 reserved = calc_reserved(sdp);
Steven Whitehouseac39aad2008-01-10 14:49:43 +0000772 unused = sdp->sd_log_blks_reserved - reserved + tr->tr_reserved;
773 gfs2_assert_withdraw(sdp, unused >= 0);
774 atomic_add(unused, &sdp->sd_log_blks_free);
Steven Whitehousefd041f02007-11-08 14:55:03 +0000775 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
Robert Peterson2332c442007-06-18 14:50:20 -0500776 sdp->sd_jdesc->jd_blocks);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000777 sdp->sd_log_blks_reserved = reserved;
778
779 gfs2_log_unlock(sdp);
780}
781
782/**
783 * gfs2_log_commit - Commit a transaction to the log
784 * @sdp: the filesystem
785 * @tr: the transaction
786 *
787 * Returns: errno
788 */
789
790void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
791{
792 log_refund(sdp, tr);
793 lops_incore_commit(sdp, tr);
794
795 sdp->sd_vfs->s_dirt = 1;
Steven Whitehouse484adff2006-03-29 09:12:12 -0500796 up_read(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000797
David Teiglandb3b94fa2006-01-16 16:50:04 +0000798 gfs2_log_lock(sdp);
Steven Whitehouseb0041572006-11-23 10:51:34 -0500799 if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks))
800 wake_up_process(sdp->sd_logd_process);
801 gfs2_log_unlock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000802}
803
804/**
805 * gfs2_log_shutdown - write a shutdown header into a journal
806 * @sdp: the filesystem
807 *
808 */
809
810void gfs2_log_shutdown(struct gfs2_sbd *sdp)
811{
Steven Whitehouse484adff2006-03-29 09:12:12 -0500812 down_write(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000813
David Teiglandb3b94fa2006-01-16 16:50:04 +0000814 gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000815 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000816 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
817 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg);
818 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf);
819 gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list));
820
821 sdp->sd_log_flush_head = sdp->sd_log_head;
822 sdp->sd_log_flush_wrapped = 0;
823
Robert Peterson2332c442007-06-18 14:50:20 -0500824 log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT,
825 (sdp->sd_log_tail == current_tail(sdp)) ? 0 : PULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000826
Steven Whitehousefd041f02007-11-08 14:55:03 +0000827 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
Steven Whitehousea74604b2006-04-21 15:10:46 -0400828 gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
829 gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000830
831 sdp->sd_log_head = sdp->sd_log_flush_head;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000832 sdp->sd_log_tail = sdp->sd_log_head;
833
Steven Whitehouse484adff2006-03-29 09:12:12 -0500834 up_write(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000835}
836
Steven Whitehousea25311c2006-11-23 11:06:35 -0500837
838/**
839 * gfs2_meta_syncfs - sync all the buffers in a filesystem
840 * @sdp: the filesystem
841 *
842 */
843
844void gfs2_meta_syncfs(struct gfs2_sbd *sdp)
845{
846 gfs2_log_flush(sdp, NULL);
847 for (;;) {
848 gfs2_ail1_start(sdp, DIO_ALL);
849 if (gfs2_ail1_empty(sdp, DIO_ALL))
850 break;
851 msleep(10);
852 }
853}
854
Steven Whitehouseec69b182007-11-09 10:01:41 +0000855
856/**
857 * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks
858 * @sdp: Pointer to GFS2 superblock
859 *
860 * Also, periodically check to make sure that we're using the most recent
861 * journal index.
862 */
863
864int gfs2_logd(void *data)
865{
866 struct gfs2_sbd *sdp = data;
Steven Whitehouseec69b182007-11-09 10:01:41 +0000867 unsigned long t;
868 int need_flush;
869
870 while (!kthread_should_stop()) {
871 /* Advance the log tail */
872
873 t = sdp->sd_log_flush_time +
874 gfs2_tune_get(sdp, gt_log_flush_secs) * HZ;
875
876 gfs2_ail1_empty(sdp, DIO_ALL);
877 gfs2_log_lock(sdp);
878 need_flush = sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks);
879 gfs2_log_unlock(sdp);
880 if (need_flush || time_after_eq(jiffies, t)) {
881 gfs2_log_flush(sdp, NULL);
882 sdp->sd_log_flush_time = jiffies;
883 }
884
Steven Whitehouseec69b182007-11-09 10:01:41 +0000885 t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
886 if (freezing(current))
887 refrigerator();
888 schedule_timeout_interruptible(t);
889 }
890
891 return 0;
892}
893