blob: 4511b08fc451586444c78379575203e20d7d72cc [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>
Steven Whitehousea25311c2006-11-23 11:06:35 -050017#include <linux/delay.h>
Steven Whitehouseec69b182007-11-09 10:01:41 +000018#include <linux/kthread.h>
19#include <linux/freezer.h>
Steven Whitehouse254db572008-09-26 10:23:22 +010020#include <linux/bio.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"
Steven Whitehouse63997772009-06-12 08:49:20 +010031#include "trace_gfs2.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000032
33#define PULL 1
34
David Teiglandb3b94fa2006-01-16 16:50:04 +000035/**
36 * gfs2_struct2blk - compute stuff
37 * @sdp: the filesystem
38 * @nstruct: the number of structures
39 * @ssize: the size of the structures
40 *
41 * Compute the number of log descriptor blocks needed to hold a certain number
42 * of structures of a certain size.
43 *
44 * Returns: the number of blocks needed (minimum is always 1)
45 */
46
47unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
48 unsigned int ssize)
49{
50 unsigned int blks;
51 unsigned int first, second;
52
53 blks = 1;
Steven Whitehousefaa31ce2006-09-13 11:13:27 -040054 first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / ssize;
David Teiglandb3b94fa2006-01-16 16:50:04 +000055
56 if (nstruct > first) {
Steven Whitehouse568f4c92006-02-27 12:00:42 -050057 second = (sdp->sd_sb.sb_bsize -
58 sizeof(struct gfs2_meta_header)) / ssize;
Steven Whitehouse5c676f62006-02-27 17:23:27 -050059 blks += DIV_ROUND_UP(nstruct - first, second);
David Teiglandb3b94fa2006-01-16 16:50:04 +000060 }
61
62 return blks;
63}
64
Steven Whitehouseddacfaf2006-10-03 11:10:41 -040065/**
Steven Whitehouse1e1a3d02007-08-27 09:45:26 +010066 * gfs2_remove_from_ail - Remove an entry from the ail lists, updating counters
67 * @mapping: The associated mapping (maybe NULL)
68 * @bd: The gfs2_bufdata to remove
69 *
70 * The log lock _must_ be held when calling this function
71 *
72 */
73
Steven Whitehousef91a0d32007-10-15 16:29:05 +010074void gfs2_remove_from_ail(struct gfs2_bufdata *bd)
Steven Whitehouse1e1a3d02007-08-27 09:45:26 +010075{
76 bd->bd_ail = NULL;
Steven Whitehouse1ad38c42007-09-03 11:01:33 +010077 list_del_init(&bd->bd_ail_st_list);
78 list_del_init(&bd->bd_ail_gl_list);
Steven Whitehouse1e1a3d02007-08-27 09:45:26 +010079 atomic_dec(&bd->bd_gl->gl_ail_count);
Steven Whitehouse1e1a3d02007-08-27 09:45:26 +010080 brelse(bd->bd_bh);
81}
82
83/**
Steven Whitehouseddacfaf2006-10-03 11:10:41 -040084 * gfs2_ail1_start_one - Start I/O on a part of the AIL
85 * @sdp: the filesystem
86 * @tr: the part of the AIL
87 *
88 */
89
90static void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
Harvey Harrison2d81afb2008-05-29 18:27:51 -070091__releases(&sdp->sd_log_lock)
92__acquires(&sdp->sd_log_lock)
Steven Whitehouseddacfaf2006-10-03 11:10:41 -040093{
94 struct gfs2_bufdata *bd, *s;
95 struct buffer_head *bh;
96 int retry;
97
Steven Whitehouseddacfaf2006-10-03 11:10:41 -040098 do {
99 retry = 0;
100
101 list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list,
102 bd_ail_st_list) {
103 bh = bd->bd_bh;
104
105 gfs2_assert(sdp, bd->bd_ail == ai);
106
107 if (!buffer_busy(bh)) {
Steven Whitehouse16615be2007-09-17 10:59:52 +0100108 if (!buffer_uptodate(bh))
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400109 gfs2_io_error_bh(sdp, bh);
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400110 list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
111 continue;
112 }
113
114 if (!buffer_dirty(bh))
115 continue;
116
117 list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list);
118
Steven Whitehouse16615be2007-09-17 10:59:52 +0100119 get_bh(bh);
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400120 gfs2_log_unlock(sdp);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100121 lock_buffer(bh);
122 if (test_clear_buffer_dirty(bh)) {
123 bh->b_end_io = end_buffer_write_sync;
Steven Whitehousec969f582009-04-07 14:13:01 +0100124 submit_bh(WRITE_SYNC_PLUG, bh);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100125 } else {
126 unlock_buffer(bh);
127 brelse(bh);
128 }
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400129 gfs2_log_lock(sdp);
130
131 retry = 1;
132 break;
133 }
134 } while (retry);
135}
136
137/**
138 * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced
139 * @sdp: the filesystem
140 * @ai: the AIL entry
141 *
142 */
143
144static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags)
145{
146 struct gfs2_bufdata *bd, *s;
147 struct buffer_head *bh;
148
149 list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list,
150 bd_ail_st_list) {
151 bh = bd->bd_bh;
152
153 gfs2_assert(sdp, bd->bd_ail == ai);
154
155 if (buffer_busy(bh)) {
156 if (flags & DIO_ALL)
157 continue;
158 else
159 break;
160 }
161
162 if (!buffer_uptodate(bh))
163 gfs2_io_error_bh(sdp, bh);
164
165 list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
166 }
167
168 return list_empty(&ai->ai_ail1_list);
169}
170
Steven Whitehousea25311c2006-11-23 11:06:35 -0500171static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000172{
Bob Peterson693ddea2007-07-24 14:07:33 -0500173 struct list_head *head;
Steven Whitehousecd915492006-09-04 12:49:07 -0400174 u64 sync_gen;
Steven Whitehouse74669412006-09-19 11:17:38 -0400175 struct list_head *first;
176 struct gfs2_ail *first_ai, *ai, *tmp;
177 int done = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000178
179 gfs2_log_lock(sdp);
Bob Peterson693ddea2007-07-24 14:07:33 -0500180 head = &sdp->sd_ail1_list;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000181 if (list_empty(head)) {
182 gfs2_log_unlock(sdp);
183 return;
184 }
185 sync_gen = sdp->sd_ail_sync_gen++;
186
187 first = head->prev;
188 first_ai = list_entry(first, struct gfs2_ail, ai_list);
189 first_ai->ai_sync_gen = sync_gen;
Steven Whitehouse74669412006-09-19 11:17:38 -0400190 gfs2_ail1_start_one(sdp, first_ai); /* This may drop log lock */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000191
192 if (flags & DIO_ALL)
193 first = NULL;
194
Steven Whitehouse74669412006-09-19 11:17:38 -0400195 while(!done) {
Steven Whitehouse484adff2006-03-29 09:12:12 -0500196 if (first && (head->prev != first ||
197 gfs2_ail1_empty_one(sdp, first_ai, 0)))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000198 break;
199
Steven Whitehouse74669412006-09-19 11:17:38 -0400200 done = 1;
201 list_for_each_entry_safe_reverse(ai, tmp, head, ai_list) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000202 if (ai->ai_sync_gen >= sync_gen)
203 continue;
204 ai->ai_sync_gen = sync_gen;
Steven Whitehouse74669412006-09-19 11:17:38 -0400205 gfs2_ail1_start_one(sdp, ai); /* This may drop log lock */
206 done = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000207 break;
208 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000209 }
210
211 gfs2_log_unlock(sdp);
212}
213
Steven Whitehouseec69b182007-11-09 10:01:41 +0000214static int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000215{
216 struct gfs2_ail *ai, *s;
217 int ret;
218
219 gfs2_log_lock(sdp);
220
221 list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) {
222 if (gfs2_ail1_empty_one(sdp, ai, flags))
223 list_move(&ai->ai_list, &sdp->sd_ail2_list);
224 else if (!(flags & DIO_ALL))
225 break;
226 }
227
228 ret = list_empty(&sdp->sd_ail1_list);
229
230 gfs2_log_unlock(sdp);
231
232 return ret;
233}
234
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400235
236/**
237 * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced
238 * @sdp: the filesystem
239 * @ai: the AIL entry
240 *
241 */
242
243static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
244{
245 struct list_head *head = &ai->ai_ail2_list;
246 struct gfs2_bufdata *bd;
247
248 while (!list_empty(head)) {
249 bd = list_entry(head->prev, struct gfs2_bufdata,
250 bd_ail_st_list);
251 gfs2_assert(sdp, bd->bd_ail == ai);
Steven Whitehousef91a0d32007-10-15 16:29:05 +0100252 gfs2_remove_from_ail(bd);
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400253 }
254}
255
David Teiglandb3b94fa2006-01-16 16:50:04 +0000256static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
257{
258 struct gfs2_ail *ai, *safe;
259 unsigned int old_tail = sdp->sd_log_tail;
260 int wrap = (new_tail < old_tail);
261 int a, b, rm;
262
263 gfs2_log_lock(sdp);
264
265 list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) {
266 a = (old_tail <= ai->ai_first);
267 b = (ai->ai_first < new_tail);
268 rm = (wrap) ? (a || b) : (a && b);
269 if (!rm)
270 continue;
271
272 gfs2_ail2_empty_one(sdp, ai);
273 list_del(&ai->ai_list);
274 gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list));
275 gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list));
276 kfree(ai);
277 }
278
279 gfs2_log_unlock(sdp);
280}
281
282/**
283 * gfs2_log_reserve - Make a log reservation
284 * @sdp: The GFS2 superblock
285 * @blks: The number of blocks to reserve
286 *
Steven Whitehouse89918642007-06-01 15:19:33 +0100287 * Note that we never give out the last few blocks of the journal. Thats
Robert Peterson2332c442007-06-18 14:50:20 -0500288 * due to the fact that there is a small number of header blocks
Steven Whitehouseb0041572006-11-23 10:51:34 -0500289 * associated with each log flush. The exact number can't be known until
290 * flush time, so we ensure that we have just enough free blocks at all
291 * times to avoid running out during a log flush.
292 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000293 * Returns: errno
294 */
295
296int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
297{
David Teiglandb3b94fa2006-01-16 16:50:04 +0000298 unsigned int try = 0;
Steven Whitehouse89918642007-06-01 15:19:33 +0100299 unsigned reserved_blks = 6 * (4096 / sdp->sd_vfs->s_blocksize);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000300
301 if (gfs2_assert_warn(sdp, blks) ||
302 gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))
303 return -EINVAL;
304
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500305 mutex_lock(&sdp->sd_log_reserve_mutex);
Steven Whitehouse484adff2006-03-29 09:12:12 -0500306 gfs2_log_lock(sdp);
Steven Whitehousefd041f02007-11-08 14:55:03 +0000307 while(atomic_read(&sdp->sd_log_blks_free) <= (blks + reserved_blks)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000308 gfs2_log_unlock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000309 gfs2_ail1_empty(sdp, 0);
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400310 gfs2_log_flush(sdp, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000311
312 if (try++)
313 gfs2_ail1_start(sdp, 0);
Steven Whitehouse484adff2006-03-29 09:12:12 -0500314 gfs2_log_lock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000315 }
Steven Whitehousefd041f02007-11-08 14:55:03 +0000316 atomic_sub(blks, &sdp->sd_log_blks_free);
Steven Whitehouse63997772009-06-12 08:49:20 +0100317 trace_gfs2_log_blocks(sdp, -blks);
Steven Whitehouse484adff2006-03-29 09:12:12 -0500318 gfs2_log_unlock(sdp);
319 mutex_unlock(&sdp->sd_log_reserve_mutex);
320
321 down_read(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000322
323 return 0;
324}
325
326/**
327 * gfs2_log_release - Release a given number of log blocks
328 * @sdp: The GFS2 superblock
329 * @blks: The number of blocks
330 *
331 */
332
333void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
334{
David Teiglandb3b94fa2006-01-16 16:50:04 +0000335
336 gfs2_log_lock(sdp);
Steven Whitehousefd041f02007-11-08 14:55:03 +0000337 atomic_add(blks, &sdp->sd_log_blks_free);
Steven Whitehouse63997772009-06-12 08:49:20 +0100338 trace_gfs2_log_blocks(sdp, blks);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000339 gfs2_assert_withdraw(sdp,
Steven Whitehousefd041f02007-11-08 14:55:03 +0000340 atomic_read(&sdp->sd_log_blks_free) <= sdp->sd_jdesc->jd_blocks);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000341 gfs2_log_unlock(sdp);
Steven Whitehouseed386502006-04-07 16:28:07 -0400342 up_read(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000343}
344
Steven Whitehousecd915492006-09-04 12:49:07 -0400345static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000346{
Bob Petersonda6dd402007-12-11 18:49:21 -0600347 struct gfs2_journal_extent *je;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000348
Bob Petersonda6dd402007-12-11 18:49:21 -0600349 list_for_each_entry(je, &sdp->sd_jdesc->extent_list, extent_list) {
350 if (lbn >= je->lblock && lbn < je->lblock + je->blocks)
Steven Whitehouseff91cc92007-12-14 14:04:34 +0000351 return je->dblock + lbn - je->lblock;
Bob Petersonda6dd402007-12-11 18:49:21 -0600352 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000353
Bob Petersonda6dd402007-12-11 18:49:21 -0600354 return -1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000355}
356
357/**
358 * log_distance - Compute distance between two journal blocks
359 * @sdp: The GFS2 superblock
360 * @newer: The most recent journal block of the pair
361 * @older: The older journal block of the pair
362 *
363 * Compute the distance (in the journal direction) between two
364 * blocks in the journal
365 *
366 * Returns: the distance in blocks
367 */
368
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400369static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000370 unsigned int older)
371{
372 int dist;
373
374 dist = newer - older;
375 if (dist < 0)
376 dist += sdp->sd_jdesc->jd_blocks;
377
378 return dist;
379}
380
Robert Peterson2332c442007-06-18 14:50:20 -0500381/**
382 * calc_reserved - Calculate the number of blocks to reserve when
383 * refunding a transaction's unused buffers.
384 * @sdp: The GFS2 superblock
385 *
386 * This is complex. We need to reserve room for all our currently used
387 * metadata buffers (e.g. normal file I/O rewriting file time stamps) and
388 * all our journaled data buffers for journaled files (e.g. files in the
389 * meta_fs like rindex, or files for which chattr +j was done.)
390 * If we don't reserve enough space, gfs2_log_refund and gfs2_log_flush
391 * will count it as free space (sd_log_blks_free) and corruption will follow.
392 *
393 * We can have metadata bufs and jdata bufs in the same journal. So each
394 * type gets its own log header, for which we need to reserve a block.
395 * In fact, each type has the potential for needing more than one header
396 * in cases where we have more buffers than will fit on a journal page.
397 * Metadata journal entries take up half the space of journaled buffer entries.
398 * Thus, metadata entries have buf_limit (502) and journaled buffers have
399 * databuf_limit (251) before they cause a wrap around.
400 *
401 * Also, we need to reserve blocks for revoke journal entries and one for an
402 * overall header for the lot.
403 *
404 * Returns: the number of blocks reserved
405 */
406static unsigned int calc_reserved(struct gfs2_sbd *sdp)
407{
408 unsigned int reserved = 0;
409 unsigned int mbuf_limit, metabufhdrs_needed;
410 unsigned int dbuf_limit, databufhdrs_needed;
411 unsigned int revokes = 0;
412
413 mbuf_limit = buf_limit(sdp);
414 metabufhdrs_needed = (sdp->sd_log_commited_buf +
415 (mbuf_limit - 1)) / mbuf_limit;
416 dbuf_limit = databuf_limit(sdp);
417 databufhdrs_needed = (sdp->sd_log_commited_databuf +
418 (dbuf_limit - 1)) / dbuf_limit;
419
420 if (sdp->sd_log_commited_revoke)
421 revokes = gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
422 sizeof(u64));
423
424 reserved = sdp->sd_log_commited_buf + metabufhdrs_needed +
425 sdp->sd_log_commited_databuf + databufhdrs_needed +
426 revokes;
427 /* One for the overall header */
428 if (reserved)
429 reserved++;
430 return reserved;
431}
432
David Teiglandb3b94fa2006-01-16 16:50:04 +0000433static unsigned int current_tail(struct gfs2_sbd *sdp)
434{
435 struct gfs2_ail *ai;
436 unsigned int tail;
437
438 gfs2_log_lock(sdp);
439
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400440 if (list_empty(&sdp->sd_ail1_list)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000441 tail = sdp->sd_log_head;
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400442 } else {
443 ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail, ai_list);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000444 tail = ai->ai_first;
445 }
446
447 gfs2_log_unlock(sdp);
448
449 return tail;
450}
451
Steven Whitehouse16615be2007-09-17 10:59:52 +0100452void gfs2_log_incr_head(struct gfs2_sbd *sdp)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000453{
454 if (sdp->sd_log_flush_head == sdp->sd_log_tail)
Steven Whitehouse16615be2007-09-17 10:59:52 +0100455 BUG_ON(sdp->sd_log_flush_head != sdp->sd_log_head);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000456
457 if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) {
458 sdp->sd_log_flush_head = 0;
459 sdp->sd_log_flush_wrapped = 1;
460 }
461}
462
463/**
Steven Whitehouse16615be2007-09-17 10:59:52 +0100464 * gfs2_log_write_endio - End of I/O for a log buffer
465 * @bh: The buffer head
466 * @uptodate: I/O Status
467 *
468 */
469
470static void gfs2_log_write_endio(struct buffer_head *bh, int uptodate)
471{
472 struct gfs2_sbd *sdp = bh->b_private;
473 bh->b_private = NULL;
474
475 end_buffer_write_sync(bh, uptodate);
476 if (atomic_dec_and_test(&sdp->sd_log_in_flight))
477 wake_up(&sdp->sd_log_flush_wait);
478}
479
480/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000481 * gfs2_log_get_buf - Get and initialize a buffer to use for log control data
482 * @sdp: The GFS2 superblock
483 *
484 * Returns: the buffer_head
485 */
486
487struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp)
488{
Steven Whitehousecd915492006-09-04 12:49:07 -0400489 u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000490 struct buffer_head *bh;
491
Steven Whitehouse16615be2007-09-17 10:59:52 +0100492 bh = sb_getblk(sdp->sd_vfs, blkno);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000493 lock_buffer(bh);
494 memset(bh->b_data, 0, bh->b_size);
495 set_buffer_uptodate(bh);
496 clear_buffer_dirty(bh);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100497 gfs2_log_incr_head(sdp);
498 atomic_inc(&sdp->sd_log_in_flight);
499 bh->b_private = sdp;
500 bh->b_end_io = gfs2_log_write_endio;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000501
502 return bh;
503}
504
505/**
Steven Whitehouse16615be2007-09-17 10:59:52 +0100506 * gfs2_fake_write_endio -
507 * @bh: The buffer head
508 * @uptodate: The I/O Status
509 *
510 */
511
512static void gfs2_fake_write_endio(struct buffer_head *bh, int uptodate)
513{
514 struct buffer_head *real_bh = bh->b_private;
Steven Whitehouse5a60c532007-09-26 09:39:31 +0100515 struct gfs2_bufdata *bd = real_bh->b_private;
516 struct gfs2_sbd *sdp = bd->bd_gl->gl_sbd;
Steven Whitehouse16615be2007-09-17 10:59:52 +0100517
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
526/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000527 * 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
534struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
535 struct buffer_head *real)
536{
Steven Whitehousecd915492006-09-04 12:49:07 -0400537 u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000538 struct buffer_head *bh;
539
Steven Whitehouse16615be2007-09-17 10:59:52 +0100540 bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000541 atomic_set(&bh->b_count, 1);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100542 bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate) | (1 << BH_Lock);
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000543 set_bh_page(bh, real->b_page, bh_offset(real));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000544 bh->b_blocknr = blkno;
545 bh->b_size = sdp->sd_sb.sb_bsize;
546 bh->b_bdev = sdp->sd_vfs->s_bdev;
Steven Whitehouse16615be2007-09-17 10:59:52 +0100547 bh->b_private = real;
548 bh->b_end_io = gfs2_fake_write_endio;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000549
Steven Whitehouse16615be2007-09-17 10:59:52 +0100550 gfs2_log_incr_head(sdp);
551 atomic_inc(&sdp->sd_log_in_flight);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000552
553 return bh;
554}
555
Robert Peterson2332c442007-06-18 14:50:20 -0500556static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000557{
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);
Steven Whitehousefd041f02007-11-08 14:55:03 +0000563 atomic_add(dist, &sdp->sd_log_blks_free);
Steven Whitehouse63997772009-06-12 08:49:20 +0100564 trace_gfs2_log_blocks(sdp, dist);
Steven Whitehousefd041f02007-11-08 14:55:03 +0000565 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <= sdp->sd_jdesc->jd_blocks);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000566 gfs2_log_unlock(sdp);
567
568 sdp->sd_log_tail = new_tail;
569}
570
571/**
572 * log_write_header - Get and initialize a journal header buffer
573 * @sdp: The GFS2 superblock
574 *
575 * Returns: the initialized log buffer descriptor
576 */
577
Steven Whitehousecd915492006-09-04 12:49:07 -0400578static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000579{
Steven Whitehousecd915492006-09-04 12:49:07 -0400580 u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000581 struct buffer_head *bh;
582 struct gfs2_log_header *lh;
583 unsigned int tail;
Steven Whitehousecd915492006-09-04 12:49:07 -0400584 u32 hash;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000585
David Teiglandb3b94fa2006-01-16 16:50:04 +0000586 bh = sb_getblk(sdp->sd_vfs, blkno);
587 lock_buffer(bh);
588 memset(bh->b_data, 0, bh->b_size);
589 set_buffer_uptodate(bh);
590 clear_buffer_dirty(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000591
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);
Steven Whitehousee3167de2006-03-30 15:46:23 -0500598 lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH);
Steven Whitehouse0ab7d132009-11-06 16:20:51 +0000599 lh->lh_header.__pad0 = cpu_to_be64(0);
Steven Whitehousee3167de2006-03-30 15:46:23 -0500600 lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH);
Steven Whitehouse0ab7d132009-11-06 16:20:51 +0000601 lh->lh_header.mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
Steven Whitehousee0f2bf72006-07-17 09:36:28 -0400602 lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++);
603 lh->lh_flags = cpu_to_be32(flags);
604 lh->lh_tail = cpu_to_be32(tail);
605 lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000606 hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header));
607 lh->lh_hash = cpu_to_be32(hash);
608
Steven Whitehouse254db572008-09-26 10:23:22 +0100609 bh->b_end_io = end_buffer_write_sync;
610 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
611 goto skip_barrier;
612 get_bh(bh);
Steven Whitehousec969f582009-04-07 14:13:01 +0100613 submit_bh(WRITE_SYNC | (1 << BIO_RW_BARRIER) | (1 << BIO_RW_META), bh);
Steven Whitehouse254db572008-09-26 10:23:22 +0100614 wait_on_buffer(bh);
615 if (buffer_eopnotsupp(bh)) {
616 clear_buffer_eopnotsupp(bh);
617 set_buffer_uptodate(bh);
618 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
619 lock_buffer(bh);
620skip_barrier:
621 get_bh(bh);
622 submit_bh(WRITE_SYNC | (1 << BIO_RW_META), bh);
623 wait_on_buffer(bh);
624 }
625 if (!buffer_uptodate(bh))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000626 gfs2_io_error_bh(sdp, bh);
627 brelse(bh);
628
629 if (sdp->sd_log_tail != tail)
Robert Peterson2332c442007-06-18 14:50:20 -0500630 log_pull_tail(sdp, tail);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000631 else
632 gfs2_assert_withdraw(sdp, !pull);
633
634 sdp->sd_log_idle = (tail == sdp->sd_log_flush_head);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100635 gfs2_log_incr_head(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000636}
637
638static void log_flush_commit(struct gfs2_sbd *sdp)
639{
Steven Whitehouse16615be2007-09-17 10:59:52 +0100640 DEFINE_WAIT(wait);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000641
Steven Whitehouse16615be2007-09-17 10:59:52 +0100642 if (atomic_read(&sdp->sd_log_in_flight)) {
643 do {
644 prepare_to_wait(&sdp->sd_log_flush_wait, &wait,
645 TASK_UNINTERRUPTIBLE);
646 if (atomic_read(&sdp->sd_log_in_flight))
647 io_schedule();
648 } while(atomic_read(&sdp->sd_log_in_flight));
649 finish_wait(&sdp->sd_log_flush_wait, &wait);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000650 }
651
Steven Whitehouse16615be2007-09-17 10:59:52 +0100652 log_write_header(sdp, 0, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000653}
654
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100655static void gfs2_ordered_write(struct gfs2_sbd *sdp)
656{
657 struct gfs2_bufdata *bd;
658 struct buffer_head *bh;
659 LIST_HEAD(written);
660
661 gfs2_log_lock(sdp);
662 while (!list_empty(&sdp->sd_log_le_ordered)) {
663 bd = list_entry(sdp->sd_log_le_ordered.next, struct gfs2_bufdata, bd_le.le_list);
664 list_move(&bd->bd_le.le_list, &written);
665 bh = bd->bd_bh;
666 if (!buffer_dirty(bh))
667 continue;
668 get_bh(bh);
669 gfs2_log_unlock(sdp);
670 lock_buffer(bh);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100671 if (buffer_mapped(bh) && test_clear_buffer_dirty(bh)) {
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100672 bh->b_end_io = end_buffer_write_sync;
Steven Whitehousec969f582009-04-07 14:13:01 +0100673 submit_bh(WRITE_SYNC_PLUG, bh);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100674 } else {
675 unlock_buffer(bh);
676 brelse(bh);
677 }
678 gfs2_log_lock(sdp);
679 }
680 list_splice(&written, &sdp->sd_log_le_ordered);
681 gfs2_log_unlock(sdp);
682}
683
684static void gfs2_ordered_wait(struct gfs2_sbd *sdp)
685{
686 struct gfs2_bufdata *bd;
687 struct buffer_head *bh;
688
689 gfs2_log_lock(sdp);
690 while (!list_empty(&sdp->sd_log_le_ordered)) {
691 bd = list_entry(sdp->sd_log_le_ordered.prev, struct gfs2_bufdata, bd_le.le_list);
692 bh = bd->bd_bh;
693 if (buffer_locked(bh)) {
694 get_bh(bh);
695 gfs2_log_unlock(sdp);
696 wait_on_buffer(bh);
697 brelse(bh);
698 gfs2_log_lock(sdp);
699 continue;
700 }
701 list_del_init(&bd->bd_le.le_list);
702 }
703 gfs2_log_unlock(sdp);
704}
705
David Teiglandb3b94fa2006-01-16 16:50:04 +0000706/**
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400707 * gfs2_log_flush - flush incore transaction(s)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000708 * @sdp: the filesystem
709 * @gl: The glock structure to flush. If NULL, flush the whole incore log
710 *
711 */
712
Steven Whitehouse2bcd6102007-11-08 14:25:12 +0000713void __gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000714{
715 struct gfs2_ail *ai;
716
Steven Whitehouse484adff2006-03-29 09:12:12 -0500717 down_write(&sdp->sd_log_flush_lock);
Steven Whitehousef55ab262006-02-21 12:51:39 +0000718
Steven Whitehouse2bcd6102007-11-08 14:25:12 +0000719 /* Log might have been flushed while we waited for the flush lock */
720 if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) {
721 up_write(&sdp->sd_log_flush_lock);
722 return;
Steven Whitehousef55ab262006-02-21 12:51:39 +0000723 }
Steven Whitehouse63997772009-06-12 08:49:20 +0100724 trace_gfs2_log_flush(sdp, 1);
Steven Whitehousef55ab262006-02-21 12:51:39 +0000725
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400726 ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL);
727 INIT_LIST_HEAD(&ai->ai_ail1_list);
728 INIT_LIST_HEAD(&ai->ai_ail2_list);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000729
Steven Whitehouse16615be2007-09-17 10:59:52 +0100730 if (sdp->sd_log_num_buf != sdp->sd_log_commited_buf) {
731 printk(KERN_INFO "GFS2: log buf %u %u\n", sdp->sd_log_num_buf,
732 sdp->sd_log_commited_buf);
733 gfs2_assert_withdraw(sdp, 0);
734 }
735 if (sdp->sd_log_num_databuf != sdp->sd_log_commited_databuf) {
736 printk(KERN_INFO "GFS2: log databuf %u %u\n",
737 sdp->sd_log_num_databuf, sdp->sd_log_commited_databuf);
738 gfs2_assert_withdraw(sdp, 0);
739 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000740 gfs2_assert_withdraw(sdp,
741 sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke);
742
David Teiglandb3b94fa2006-01-16 16:50:04 +0000743 sdp->sd_log_flush_head = sdp->sd_log_head;
744 sdp->sd_log_flush_wrapped = 0;
745 ai->ai_first = sdp->sd_log_flush_head;
746
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100747 gfs2_ordered_write(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000748 lops_before_commit(sdp);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100749 gfs2_ordered_wait(sdp);
750
Steven Whitehouse16615be2007-09-17 10:59:52 +0100751 if (sdp->sd_log_head != sdp->sd_log_flush_head)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000752 log_flush_commit(sdp);
Robert Peterson2332c442007-06-18 14:50:20 -0500753 else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){
754 gfs2_log_lock(sdp);
Steven Whitehousefd041f02007-11-08 14:55:03 +0000755 atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
Steven Whitehouse63997772009-06-12 08:49:20 +0100756 trace_gfs2_log_blocks(sdp, -1);
Robert Peterson2332c442007-06-18 14:50:20 -0500757 gfs2_log_unlock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000758 log_write_header(sdp, 0, PULL);
Robert Peterson2332c442007-06-18 14:50:20 -0500759 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000760 lops_after_commit(sdp, ai);
Steven Whitehousefe1a6982006-10-11 13:34:59 -0400761
762 gfs2_log_lock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000763 sdp->sd_log_head = sdp->sd_log_flush_head;
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400764 sdp->sd_log_blks_reserved = 0;
765 sdp->sd_log_commited_buf = 0;
Robert Peterson2332c442007-06-18 14:50:20 -0500766 sdp->sd_log_commited_databuf = 0;
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400767 sdp->sd_log_commited_revoke = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000768
David Teiglandb3b94fa2006-01-16 16:50:04 +0000769 if (!list_empty(&ai->ai_ail1_list)) {
770 list_add(&ai->ai_list, &sdp->sd_ail1_list);
771 ai = NULL;
772 }
773 gfs2_log_unlock(sdp);
Steven Whitehouse63997772009-06-12 08:49:20 +0100774 trace_gfs2_log_flush(sdp, 0);
Steven Whitehouse484adff2006-03-29 09:12:12 -0500775 up_write(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000776
777 kfree(ai);
778}
779
780static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
781{
Robert Peterson2332c442007-06-18 14:50:20 -0500782 unsigned int reserved;
Steven Whitehouseac39aad2008-01-10 14:49:43 +0000783 unsigned int unused;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000784
785 gfs2_log_lock(sdp);
786
787 sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm;
Robert Peterson2332c442007-06-18 14:50:20 -0500788 sdp->sd_log_commited_databuf += tr->tr_num_databuf_new -
789 tr->tr_num_databuf_rm;
790 gfs2_assert_withdraw(sdp, (((int)sdp->sd_log_commited_buf) >= 0) ||
791 (((int)sdp->sd_log_commited_databuf) >= 0));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000792 sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
793 gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0);
Robert Peterson2332c442007-06-18 14:50:20 -0500794 reserved = calc_reserved(sdp);
Roel Kluin62be1f72008-04-17 17:25:37 +0200795 gfs2_assert_withdraw(sdp, sdp->sd_log_blks_reserved + tr->tr_reserved >= reserved);
Steven Whitehouseac39aad2008-01-10 14:49:43 +0000796 unused = sdp->sd_log_blks_reserved - reserved + tr->tr_reserved;
Steven Whitehouseac39aad2008-01-10 14:49:43 +0000797 atomic_add(unused, &sdp->sd_log_blks_free);
Steven Whitehouse63997772009-06-12 08:49:20 +0100798 trace_gfs2_log_blocks(sdp, unused);
Steven Whitehousefd041f02007-11-08 14:55:03 +0000799 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
Robert Peterson2332c442007-06-18 14:50:20 -0500800 sdp->sd_jdesc->jd_blocks);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000801 sdp->sd_log_blks_reserved = reserved;
802
803 gfs2_log_unlock(sdp);
804}
805
Bob Petersond0109bf2008-01-28 11:20:10 -0600806static void buf_lo_incore_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
807{
808 struct list_head *head = &tr->tr_list_buf;
809 struct gfs2_bufdata *bd;
810
811 gfs2_log_lock(sdp);
812 while (!list_empty(head)) {
813 bd = list_entry(head->next, struct gfs2_bufdata, bd_list_tr);
814 list_del_init(&bd->bd_list_tr);
815 tr->tr_num_buf--;
816 }
817 gfs2_log_unlock(sdp);
818 gfs2_assert_warn(sdp, !tr->tr_num_buf);
819}
820
David Teiglandb3b94fa2006-01-16 16:50:04 +0000821/**
822 * gfs2_log_commit - Commit a transaction to the log
823 * @sdp: the filesystem
824 * @tr: the transaction
825 *
826 * Returns: errno
827 */
828
829void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
830{
831 log_refund(sdp, tr);
Bob Petersond0109bf2008-01-28 11:20:10 -0600832 buf_lo_incore_commit(sdp, tr);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000833
Steven Whitehouse484adff2006-03-29 09:12:12 -0500834 up_read(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000835
David Teiglandb3b94fa2006-01-16 16:50:04 +0000836 gfs2_log_lock(sdp);
Steven Whitehouseb0041572006-11-23 10:51:34 -0500837 if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks))
838 wake_up_process(sdp->sd_logd_process);
839 gfs2_log_unlock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000840}
841
842/**
843 * gfs2_log_shutdown - write a shutdown header into a journal
844 * @sdp: the filesystem
845 *
846 */
847
848void gfs2_log_shutdown(struct gfs2_sbd *sdp)
849{
Steven Whitehouse484adff2006-03-29 09:12:12 -0500850 down_write(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000851
David Teiglandb3b94fa2006-01-16 16:50:04 +0000852 gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000853 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000854 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
855 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg);
856 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf);
857 gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list));
858
859 sdp->sd_log_flush_head = sdp->sd_log_head;
860 sdp->sd_log_flush_wrapped = 0;
861
Robert Peterson2332c442007-06-18 14:50:20 -0500862 log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT,
863 (sdp->sd_log_tail == current_tail(sdp)) ? 0 : PULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000864
Steven Whitehousefd041f02007-11-08 14:55:03 +0000865 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
Steven Whitehousea74604b2006-04-21 15:10:46 -0400866 gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
867 gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000868
869 sdp->sd_log_head = sdp->sd_log_flush_head;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000870 sdp->sd_log_tail = sdp->sd_log_head;
871
Steven Whitehouse484adff2006-03-29 09:12:12 -0500872 up_write(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000873}
874
Steven Whitehousea25311c2006-11-23 11:06:35 -0500875
876/**
877 * gfs2_meta_syncfs - sync all the buffers in a filesystem
878 * @sdp: the filesystem
879 *
880 */
881
882void gfs2_meta_syncfs(struct gfs2_sbd *sdp)
883{
884 gfs2_log_flush(sdp, NULL);
885 for (;;) {
886 gfs2_ail1_start(sdp, DIO_ALL);
887 if (gfs2_ail1_empty(sdp, DIO_ALL))
888 break;
889 msleep(10);
890 }
891}
892
Steven Whitehouseec69b182007-11-09 10:01:41 +0000893
894/**
895 * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks
896 * @sdp: Pointer to GFS2 superblock
897 *
898 * Also, periodically check to make sure that we're using the most recent
899 * journal index.
900 */
901
902int gfs2_logd(void *data)
903{
904 struct gfs2_sbd *sdp = data;
Steven Whitehouseec69b182007-11-09 10:01:41 +0000905 unsigned long t;
906 int need_flush;
907
908 while (!kthread_should_stop()) {
909 /* Advance the log tail */
910
911 t = sdp->sd_log_flush_time +
912 gfs2_tune_get(sdp, gt_log_flush_secs) * HZ;
913
914 gfs2_ail1_empty(sdp, DIO_ALL);
915 gfs2_log_lock(sdp);
916 need_flush = sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks);
917 gfs2_log_unlock(sdp);
918 if (need_flush || time_after_eq(jiffies, t)) {
919 gfs2_log_flush(sdp, NULL);
920 sdp->sd_log_flush_time = jiffies;
921 }
922
Steven Whitehouseec69b182007-11-09 10:01:41 +0000923 t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
924 if (freezing(current))
925 refrigerator();
926 schedule_timeout_interruptible(t);
927 }
928
929 return 0;
930}
931