blob: f4beeb9c81c1e5ee165e62c585b67d922f42553c [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>
Steven Whitehouse4667a0e2011-04-18 14:18:09 +010021#include <linux/writeback.h>
Bob Peterson4a36d082012-02-14 14:49:57 -050022#include <linux/list_sort.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000023
24#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050025#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000026#include "bmap.h"
27#include "glock.h"
28#include "log.h"
29#include "lops.h"
30#include "meta_io.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050031#include "util.h"
Steven Whitehouse71b86f52006-03-28 14:14:04 -050032#include "dir.h"
Steven Whitehouse63997772009-06-12 08:49:20 +010033#include "trace_gfs2.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000034
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 *
Steven Whitehousec618e872011-03-14 12:40:29 +000070 * The ail lock _must_ be held when calling this function
Steven Whitehouse1e1a3d02007-08-27 09:45:26 +010071 *
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
Steven Whitehouse4667a0e2011-04-18 14:18:09 +010086 * @wbc: The writeback control structure
87 * @ai: The ail structure
Steven Whitehouseddacfaf2006-10-03 11:10:41 -040088 *
89 */
90
Steven Whitehouse4f1de012011-04-26 10:23:56 +010091static int gfs2_ail1_start_one(struct gfs2_sbd *sdp,
92 struct writeback_control *wbc,
93 struct gfs2_ail *ai)
Dave Chinnerd6a079e2011-03-11 11:52:25 +000094__releases(&sdp->sd_ail_lock)
95__acquires(&sdp->sd_ail_lock)
Steven Whitehouseddacfaf2006-10-03 11:10:41 -040096{
Steven Whitehouse5ac048b2011-03-30 16:25:51 +010097 struct gfs2_glock *gl = NULL;
Steven Whitehouse4667a0e2011-04-18 14:18:09 +010098 struct address_space *mapping;
Steven Whitehouseddacfaf2006-10-03 11:10:41 -040099 struct gfs2_bufdata *bd, *s;
100 struct buffer_head *bh;
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400101
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100102 list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, bd_ail_st_list) {
103 bh = bd->bd_bh;
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400104
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100105 gfs2_assert(sdp, bd->bd_ail == ai);
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400106
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100107 if (!buffer_busy(bh)) {
108 if (!buffer_uptodate(bh))
109 gfs2_io_error_bh(sdp, bh);
110 list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
111 continue;
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400112 }
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100113
114 if (!buffer_dirty(bh))
115 continue;
116 if (gl == bd->bd_gl)
117 continue;
118 gl = bd->bd_gl;
119 list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list);
120 mapping = bh->b_page->mapping;
Steven Whitehouse4f1de012011-04-26 10:23:56 +0100121 if (!mapping)
122 continue;
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100123 spin_unlock(&sdp->sd_ail_lock);
124 generic_writepages(mapping, wbc);
125 spin_lock(&sdp->sd_ail_lock);
126 if (wbc->nr_to_write <= 0)
127 break;
Steven Whitehouse4f1de012011-04-26 10:23:56 +0100128 return 1;
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100129 }
Steven Whitehouse4f1de012011-04-26 10:23:56 +0100130
131 return 0;
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100132}
133
134
135/**
136 * gfs2_ail1_flush - start writeback of some ail1 entries
137 * @sdp: The super block
138 * @wbc: The writeback control structure
139 *
140 * Writes back some ail1 entries, according to the limits in the
141 * writeback control structure
142 */
143
144void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc)
145{
146 struct list_head *head = &sdp->sd_ail1_list;
147 struct gfs2_ail *ai;
148
Steven Whitehousec83ae9c2011-04-18 14:18:38 +0100149 trace_gfs2_ail_flush(sdp, wbc, 1);
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100150 spin_lock(&sdp->sd_ail_lock);
Steven Whitehouse4f1de012011-04-26 10:23:56 +0100151restart:
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100152 list_for_each_entry_reverse(ai, head, ai_list) {
153 if (wbc->nr_to_write <= 0)
154 break;
Steven Whitehouse4f1de012011-04-26 10:23:56 +0100155 if (gfs2_ail1_start_one(sdp, wbc, ai))
156 goto restart;
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100157 }
158 spin_unlock(&sdp->sd_ail_lock);
Steven Whitehousec83ae9c2011-04-18 14:18:38 +0100159 trace_gfs2_ail_flush(sdp, wbc, 0);
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100160}
161
162/**
163 * gfs2_ail1_start - start writeback of all ail1 entries
164 * @sdp: The superblock
165 */
166
167static void gfs2_ail1_start(struct gfs2_sbd *sdp)
168{
169 struct writeback_control wbc = {
170 .sync_mode = WB_SYNC_NONE,
171 .nr_to_write = LONG_MAX,
172 .range_start = 0,
173 .range_end = LLONG_MAX,
174 };
175
176 return gfs2_ail1_flush(sdp, &wbc);
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400177}
178
179/**
180 * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced
181 * @sdp: the filesystem
182 * @ai: the AIL entry
183 *
184 */
185
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100186static void gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400187{
188 struct gfs2_bufdata *bd, *s;
189 struct buffer_head *bh;
190
191 list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list,
192 bd_ail_st_list) {
193 bh = bd->bd_bh;
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400194 gfs2_assert(sdp, bd->bd_ail == ai);
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100195 if (buffer_busy(bh))
196 continue;
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400197 if (!buffer_uptodate(bh))
198 gfs2_io_error_bh(sdp, bh);
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400199 list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
200 }
201
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400202}
203
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100204/**
205 * gfs2_ail1_empty - Try to empty the ail1 lists
206 * @sdp: The superblock
207 *
208 * Tries to empty the ail1 lists, starting with the oldest first
209 */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000210
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100211static int gfs2_ail1_empty(struct gfs2_sbd *sdp)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000212{
213 struct gfs2_ail *ai, *s;
214 int ret;
215
Dave Chinnerd6a079e2011-03-11 11:52:25 +0000216 spin_lock(&sdp->sd_ail_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000217 list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) {
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100218 gfs2_ail1_empty_one(sdp, ai);
219 if (list_empty(&ai->ai_ail1_list))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000220 list_move(&ai->ai_list, &sdp->sd_ail2_list);
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100221 else
David Teiglandb3b94fa2006-01-16 16:50:04 +0000222 break;
223 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000224 ret = list_empty(&sdp->sd_ail1_list);
Dave Chinnerd6a079e2011-03-11 11:52:25 +0000225 spin_unlock(&sdp->sd_ail_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000226
227 return ret;
228}
229
Steven Whitehouse26b06a62011-05-21 19:21:07 +0100230static void gfs2_ail1_wait(struct gfs2_sbd *sdp)
231{
232 struct gfs2_ail *ai;
233 struct gfs2_bufdata *bd;
234 struct buffer_head *bh;
235
236 spin_lock(&sdp->sd_ail_lock);
237 list_for_each_entry_reverse(ai, &sdp->sd_ail1_list, ai_list) {
238 list_for_each_entry(bd, &ai->ai_ail1_list, bd_ail_st_list) {
239 bh = bd->bd_bh;
240 if (!buffer_locked(bh))
241 continue;
242 get_bh(bh);
243 spin_unlock(&sdp->sd_ail_lock);
244 wait_on_buffer(bh);
245 brelse(bh);
246 return;
247 }
248 }
249 spin_unlock(&sdp->sd_ail_lock);
250}
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400251
252/**
253 * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced
254 * @sdp: the filesystem
255 * @ai: the AIL entry
256 *
257 */
258
259static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
260{
261 struct list_head *head = &ai->ai_ail2_list;
262 struct gfs2_bufdata *bd;
263
264 while (!list_empty(head)) {
265 bd = list_entry(head->prev, struct gfs2_bufdata,
266 bd_ail_st_list);
267 gfs2_assert(sdp, bd->bd_ail == ai);
Steven Whitehousef91a0d32007-10-15 16:29:05 +0100268 gfs2_remove_from_ail(bd);
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400269 }
270}
271
David Teiglandb3b94fa2006-01-16 16:50:04 +0000272static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
273{
274 struct gfs2_ail *ai, *safe;
275 unsigned int old_tail = sdp->sd_log_tail;
276 int wrap = (new_tail < old_tail);
277 int a, b, rm;
278
Dave Chinnerd6a079e2011-03-11 11:52:25 +0000279 spin_lock(&sdp->sd_ail_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000280
281 list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) {
282 a = (old_tail <= ai->ai_first);
283 b = (ai->ai_first < new_tail);
284 rm = (wrap) ? (a || b) : (a && b);
285 if (!rm)
286 continue;
287
288 gfs2_ail2_empty_one(sdp, ai);
289 list_del(&ai->ai_list);
290 gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list));
291 gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list));
292 kfree(ai);
293 }
294
Dave Chinnerd6a079e2011-03-11 11:52:25 +0000295 spin_unlock(&sdp->sd_ail_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000296}
297
298/**
299 * gfs2_log_reserve - Make a log reservation
300 * @sdp: The GFS2 superblock
301 * @blks: The number of blocks to reserve
302 *
Steven Whitehouse89918642007-06-01 15:19:33 +0100303 * Note that we never give out the last few blocks of the journal. Thats
Robert Peterson2332c442007-06-18 14:50:20 -0500304 * due to the fact that there is a small number of header blocks
Steven Whitehouseb0041572006-11-23 10:51:34 -0500305 * associated with each log flush. The exact number can't be known until
306 * flush time, so we ensure that we have just enough free blocks at all
307 * times to avoid running out during a log flush.
308 *
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500309 * We no longer flush the log here, instead we wake up logd to do that
310 * for us. To avoid the thundering herd and to ensure that we deal fairly
311 * with queued waiters, we use an exclusive wait. This means that when we
312 * get woken with enough journal space to get our reservation, we need to
313 * wake the next waiter on the list.
314 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000315 * Returns: errno
316 */
317
318int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
319{
Steven Whitehouse89918642007-06-01 15:19:33 +0100320 unsigned reserved_blks = 6 * (4096 / sdp->sd_vfs->s_blocksize);
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500321 unsigned wanted = blks + reserved_blks;
322 DEFINE_WAIT(wait);
323 int did_wait = 0;
324 unsigned int free_blocks;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000325
326 if (gfs2_assert_warn(sdp, blks) ||
327 gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))
328 return -EINVAL;
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500329retry:
330 free_blocks = atomic_read(&sdp->sd_log_blks_free);
331 if (unlikely(free_blocks <= wanted)) {
332 do {
333 prepare_to_wait_exclusive(&sdp->sd_log_waitq, &wait,
334 TASK_UNINTERRUPTIBLE);
335 wake_up(&sdp->sd_logd_waitq);
336 did_wait = 1;
337 if (atomic_read(&sdp->sd_log_blks_free) <= wanted)
338 io_schedule();
339 free_blocks = atomic_read(&sdp->sd_log_blks_free);
340 } while(free_blocks <= wanted);
341 finish_wait(&sdp->sd_log_waitq, &wait);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000342 }
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500343 if (atomic_cmpxchg(&sdp->sd_log_blks_free, free_blocks,
344 free_blocks - blks) != free_blocks)
345 goto retry;
Steven Whitehouse63997772009-06-12 08:49:20 +0100346 trace_gfs2_log_blocks(sdp, -blks);
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500347
348 /*
349 * If we waited, then so might others, wake them up _after_ we get
350 * our share of the log.
351 */
352 if (unlikely(did_wait))
353 wake_up(&sdp->sd_log_waitq);
Steven Whitehouse484adff2006-03-29 09:12:12 -0500354
355 down_read(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000356
357 return 0;
358}
359
David Teiglandb3b94fa2006-01-16 16:50:04 +0000360/**
361 * log_distance - Compute distance between two journal blocks
362 * @sdp: The GFS2 superblock
363 * @newer: The most recent journal block of the pair
364 * @older: The older journal block of the pair
365 *
366 * Compute the distance (in the journal direction) between two
367 * blocks in the journal
368 *
369 * Returns: the distance in blocks
370 */
371
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400372static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000373 unsigned int older)
374{
375 int dist;
376
377 dist = newer - older;
378 if (dist < 0)
379 dist += sdp->sd_jdesc->jd_blocks;
380
381 return dist;
382}
383
Robert Peterson2332c442007-06-18 14:50:20 -0500384/**
385 * calc_reserved - Calculate the number of blocks to reserve when
386 * refunding a transaction's unused buffers.
387 * @sdp: The GFS2 superblock
388 *
389 * This is complex. We need to reserve room for all our currently used
390 * metadata buffers (e.g. normal file I/O rewriting file time stamps) and
391 * all our journaled data buffers for journaled files (e.g. files in the
392 * meta_fs like rindex, or files for which chattr +j was done.)
393 * If we don't reserve enough space, gfs2_log_refund and gfs2_log_flush
394 * will count it as free space (sd_log_blks_free) and corruption will follow.
395 *
396 * We can have metadata bufs and jdata bufs in the same journal. So each
397 * type gets its own log header, for which we need to reserve a block.
398 * In fact, each type has the potential for needing more than one header
399 * in cases where we have more buffers than will fit on a journal page.
400 * Metadata journal entries take up half the space of journaled buffer entries.
401 * Thus, metadata entries have buf_limit (502) and journaled buffers have
402 * databuf_limit (251) before they cause a wrap around.
403 *
404 * Also, we need to reserve blocks for revoke journal entries and one for an
405 * overall header for the lot.
406 *
407 * Returns: the number of blocks reserved
408 */
409static unsigned int calc_reserved(struct gfs2_sbd *sdp)
410{
411 unsigned int reserved = 0;
412 unsigned int mbuf_limit, metabufhdrs_needed;
413 unsigned int dbuf_limit, databufhdrs_needed;
414 unsigned int revokes = 0;
415
416 mbuf_limit = buf_limit(sdp);
417 metabufhdrs_needed = (sdp->sd_log_commited_buf +
418 (mbuf_limit - 1)) / mbuf_limit;
419 dbuf_limit = databuf_limit(sdp);
420 databufhdrs_needed = (sdp->sd_log_commited_databuf +
421 (dbuf_limit - 1)) / dbuf_limit;
422
Benjamin Marzinski2e95e3f2010-03-10 18:10:19 -0600423 if (sdp->sd_log_commited_revoke > 0)
Robert Peterson2332c442007-06-18 14:50:20 -0500424 revokes = gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
425 sizeof(u64));
426
427 reserved = sdp->sd_log_commited_buf + metabufhdrs_needed +
428 sdp->sd_log_commited_databuf + databufhdrs_needed +
429 revokes;
430 /* One for the overall header */
431 if (reserved)
432 reserved++;
433 return reserved;
434}
435
David Teiglandb3b94fa2006-01-16 16:50:04 +0000436static unsigned int current_tail(struct gfs2_sbd *sdp)
437{
438 struct gfs2_ail *ai;
439 unsigned int tail;
440
Dave Chinnerd6a079e2011-03-11 11:52:25 +0000441 spin_lock(&sdp->sd_ail_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000442
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400443 if (list_empty(&sdp->sd_ail1_list)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000444 tail = sdp->sd_log_head;
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400445 } else {
446 ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail, ai_list);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000447 tail = ai->ai_first;
448 }
449
Dave Chinnerd6a079e2011-03-11 11:52:25 +0000450 spin_unlock(&sdp->sd_ail_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000451
452 return tail;
453}
454
Robert Peterson2332c442007-06-18 14:50:20 -0500455static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000456{
457 unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail);
458
459 ail2_empty(sdp, new_tail);
460
Steven Whitehousefd041f02007-11-08 14:55:03 +0000461 atomic_add(dist, &sdp->sd_log_blks_free);
Steven Whitehouse63997772009-06-12 08:49:20 +0100462 trace_gfs2_log_blocks(sdp, dist);
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500463 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
464 sdp->sd_jdesc->jd_blocks);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000465
466 sdp->sd_log_tail = new_tail;
467}
468
David Teiglandb3b94fa2006-01-16 16:50:04 +0000469
Steven Whitehouse34cc1782012-03-09 10:45:56 +0000470static void log_flush_wait(struct gfs2_sbd *sdp)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000471{
Steven Whitehouse16615be2007-09-17 10:59:52 +0100472 DEFINE_WAIT(wait);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000473
Steven Whitehouse16615be2007-09-17 10:59:52 +0100474 if (atomic_read(&sdp->sd_log_in_flight)) {
475 do {
476 prepare_to_wait(&sdp->sd_log_flush_wait, &wait,
477 TASK_UNINTERRUPTIBLE);
478 if (atomic_read(&sdp->sd_log_in_flight))
479 io_schedule();
480 } while(atomic_read(&sdp->sd_log_in_flight));
481 finish_wait(&sdp->sd_log_flush_wait, &wait);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000482 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000483}
484
Steven Whitehouse08728f22012-02-21 11:14:00 +0000485static int bd_cmp(void *priv, struct list_head *a, struct list_head *b)
Bob Peterson4a36d082012-02-14 14:49:57 -0500486{
487 struct gfs2_bufdata *bda, *bdb;
488
Bob Petersonc0752aa2012-05-01 12:00:34 -0400489 bda = list_entry(a, struct gfs2_bufdata, bd_list);
490 bdb = list_entry(b, struct gfs2_bufdata, bd_list);
Bob Peterson4a36d082012-02-14 14:49:57 -0500491
492 if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr)
493 return -1;
494 if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr)
495 return 1;
496 return 0;
497}
498
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100499static void gfs2_ordered_write(struct gfs2_sbd *sdp)
500{
501 struct gfs2_bufdata *bd;
502 struct buffer_head *bh;
503 LIST_HEAD(written);
504
505 gfs2_log_lock(sdp);
Bob Peterson4a36d082012-02-14 14:49:57 -0500506 list_sort(NULL, &sdp->sd_log_le_ordered, &bd_cmp);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100507 while (!list_empty(&sdp->sd_log_le_ordered)) {
Bob Petersonc0752aa2012-05-01 12:00:34 -0400508 bd = list_entry(sdp->sd_log_le_ordered.next, struct gfs2_bufdata, bd_list);
509 list_move(&bd->bd_list, &written);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100510 bh = bd->bd_bh;
511 if (!buffer_dirty(bh))
512 continue;
513 get_bh(bh);
514 gfs2_log_unlock(sdp);
515 lock_buffer(bh);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100516 if (buffer_mapped(bh) && test_clear_buffer_dirty(bh)) {
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100517 bh->b_end_io = end_buffer_write_sync;
Jens Axboe721a9602011-03-09 11:56:30 +0100518 submit_bh(WRITE_SYNC, bh);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100519 } else {
520 unlock_buffer(bh);
521 brelse(bh);
522 }
523 gfs2_log_lock(sdp);
524 }
525 list_splice(&written, &sdp->sd_log_le_ordered);
526 gfs2_log_unlock(sdp);
527}
528
529static void gfs2_ordered_wait(struct gfs2_sbd *sdp)
530{
531 struct gfs2_bufdata *bd;
532 struct buffer_head *bh;
533
534 gfs2_log_lock(sdp);
535 while (!list_empty(&sdp->sd_log_le_ordered)) {
Bob Petersonc0752aa2012-05-01 12:00:34 -0400536 bd = list_entry(sdp->sd_log_le_ordered.prev, struct gfs2_bufdata, bd_list);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100537 bh = bd->bd_bh;
538 if (buffer_locked(bh)) {
539 get_bh(bh);
540 gfs2_log_unlock(sdp);
541 wait_on_buffer(bh);
542 brelse(bh);
543 gfs2_log_lock(sdp);
544 continue;
545 }
Bob Petersonc0752aa2012-05-01 12:00:34 -0400546 list_del_init(&bd->bd_list);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100547 }
548 gfs2_log_unlock(sdp);
549}
550
David Teiglandb3b94fa2006-01-16 16:50:04 +0000551/**
Steven Whitehouse34cc1782012-03-09 10:45:56 +0000552 * log_write_header - Get and initialize a journal header buffer
553 * @sdp: The GFS2 superblock
554 *
555 * Returns: the initialized log buffer descriptor
556 */
557
Steven Whitehousefdb76a42012-04-02 15:34:36 +0100558static void log_write_header(struct gfs2_sbd *sdp, u32 flags)
Steven Whitehouse34cc1782012-03-09 10:45:56 +0000559{
Steven Whitehouse34cc1782012-03-09 10:45:56 +0000560 struct gfs2_log_header *lh;
561 unsigned int tail;
562 u32 hash;
Steven Whitehousee8c92ed2012-04-16 09:28:31 +0100563 int rw = WRITE_FLUSH_FUA | REQ_META;
564 struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
565 lh = page_address(page);
566 clear_page(lh);
Steven Whitehouse34cc1782012-03-09 10:45:56 +0000567
568 gfs2_ail1_empty(sdp);
569 tail = current_tail(sdp);
570
Steven Whitehouse34cc1782012-03-09 10:45:56 +0000571 lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
572 lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH);
573 lh->lh_header.__pad0 = cpu_to_be64(0);
574 lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH);
575 lh->lh_header.mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
576 lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++);
577 lh->lh_flags = cpu_to_be32(flags);
578 lh->lh_tail = cpu_to_be32(tail);
579 lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head);
Steven Whitehousee8c92ed2012-04-16 09:28:31 +0100580 hash = gfs2_disk_hash(page_address(page), sizeof(struct gfs2_log_header));
Steven Whitehouse34cc1782012-03-09 10:45:56 +0000581 lh->lh_hash = cpu_to_be32(hash);
582
Steven Whitehouse34cc1782012-03-09 10:45:56 +0000583 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) {
584 gfs2_ordered_wait(sdp);
585 log_flush_wait(sdp);
Steven Whitehousee8c92ed2012-04-16 09:28:31 +0100586 rw = WRITE_SYNC | REQ_META | REQ_PRIO;
Steven Whitehouse34cc1782012-03-09 10:45:56 +0000587 }
Steven Whitehouse34cc1782012-03-09 10:45:56 +0000588
Steven Whitehousee8c92ed2012-04-16 09:28:31 +0100589 sdp->sd_log_idle = (tail == sdp->sd_log_flush_head);
590 gfs2_log_write_page(sdp, page);
591 gfs2_log_flush_bio(sdp, rw);
592 log_flush_wait(sdp);
Steven Whitehouse34cc1782012-03-09 10:45:56 +0000593
594 if (sdp->sd_log_tail != tail)
595 log_pull_tail(sdp, tail);
Steven Whitehouse34cc1782012-03-09 10:45:56 +0000596}
597
598/**
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400599 * gfs2_log_flush - flush incore transaction(s)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000600 * @sdp: the filesystem
601 * @gl: The glock structure to flush. If NULL, flush the whole incore log
602 *
603 */
604
Bob Petersoned4878e2010-05-20 23:30:11 -0400605void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000606{
607 struct gfs2_ail *ai;
608
Steven Whitehouse484adff2006-03-29 09:12:12 -0500609 down_write(&sdp->sd_log_flush_lock);
Steven Whitehousef55ab262006-02-21 12:51:39 +0000610
Steven Whitehouse2bcd6102007-11-08 14:25:12 +0000611 /* Log might have been flushed while we waited for the flush lock */
612 if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) {
613 up_write(&sdp->sd_log_flush_lock);
614 return;
Steven Whitehousef55ab262006-02-21 12:51:39 +0000615 }
Steven Whitehouse63997772009-06-12 08:49:20 +0100616 trace_gfs2_log_flush(sdp, 1);
Steven Whitehousef55ab262006-02-21 12:51:39 +0000617
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400618 ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL);
619 INIT_LIST_HEAD(&ai->ai_ail1_list);
620 INIT_LIST_HEAD(&ai->ai_ail2_list);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000621
Steven Whitehouse16615be2007-09-17 10:59:52 +0100622 if (sdp->sd_log_num_buf != sdp->sd_log_commited_buf) {
623 printk(KERN_INFO "GFS2: log buf %u %u\n", sdp->sd_log_num_buf,
624 sdp->sd_log_commited_buf);
625 gfs2_assert_withdraw(sdp, 0);
626 }
627 if (sdp->sd_log_num_databuf != sdp->sd_log_commited_databuf) {
628 printk(KERN_INFO "GFS2: log databuf %u %u\n",
629 sdp->sd_log_num_databuf, sdp->sd_log_commited_databuf);
630 gfs2_assert_withdraw(sdp, 0);
631 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000632 gfs2_assert_withdraw(sdp,
633 sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke);
634
David Teiglandb3b94fa2006-01-16 16:50:04 +0000635 sdp->sd_log_flush_head = sdp->sd_log_head;
636 sdp->sd_log_flush_wrapped = 0;
637 ai->ai_first = sdp->sd_log_flush_head;
638
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100639 gfs2_ordered_write(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000640 lops_before_commit(sdp);
Steven Whitehousee8c92ed2012-04-16 09:28:31 +0100641 gfs2_log_flush_bio(sdp, WRITE);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100642
Steven Whitehouse34cc1782012-03-09 10:45:56 +0000643 if (sdp->sd_log_head != sdp->sd_log_flush_head) {
Steven Whitehousefdb76a42012-04-02 15:34:36 +0100644 log_write_header(sdp, 0);
Steven Whitehouse34cc1782012-03-09 10:45:56 +0000645 } else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){
Steven Whitehousefd041f02007-11-08 14:55:03 +0000646 atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
Steven Whitehouse63997772009-06-12 08:49:20 +0100647 trace_gfs2_log_blocks(sdp, -1);
Steven Whitehousefdb76a42012-04-02 15:34:36 +0100648 log_write_header(sdp, 0);
Robert Peterson2332c442007-06-18 14:50:20 -0500649 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000650 lops_after_commit(sdp, ai);
Steven Whitehousefe1a6982006-10-11 13:34:59 -0400651
652 gfs2_log_lock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000653 sdp->sd_log_head = sdp->sd_log_flush_head;
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400654 sdp->sd_log_blks_reserved = 0;
655 sdp->sd_log_commited_buf = 0;
Robert Peterson2332c442007-06-18 14:50:20 -0500656 sdp->sd_log_commited_databuf = 0;
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400657 sdp->sd_log_commited_revoke = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000658
Dave Chinnerd6a079e2011-03-11 11:52:25 +0000659 spin_lock(&sdp->sd_ail_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000660 if (!list_empty(&ai->ai_ail1_list)) {
661 list_add(&ai->ai_list, &sdp->sd_ail1_list);
662 ai = NULL;
663 }
Dave Chinnerd6a079e2011-03-11 11:52:25 +0000664 spin_unlock(&sdp->sd_ail_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000665 gfs2_log_unlock(sdp);
Steven Whitehouse63997772009-06-12 08:49:20 +0100666 trace_gfs2_log_flush(sdp, 0);
Steven Whitehouse484adff2006-03-29 09:12:12 -0500667 up_write(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000668
669 kfree(ai);
670}
671
672static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
673{
Robert Peterson2332c442007-06-18 14:50:20 -0500674 unsigned int reserved;
Steven Whitehouseac39aad2008-01-10 14:49:43 +0000675 unsigned int unused;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000676
677 gfs2_log_lock(sdp);
678
679 sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm;
Robert Peterson2332c442007-06-18 14:50:20 -0500680 sdp->sd_log_commited_databuf += tr->tr_num_databuf_new -
681 tr->tr_num_databuf_rm;
682 gfs2_assert_withdraw(sdp, (((int)sdp->sd_log_commited_buf) >= 0) ||
683 (((int)sdp->sd_log_commited_databuf) >= 0));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000684 sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
Robert Peterson2332c442007-06-18 14:50:20 -0500685 reserved = calc_reserved(sdp);
Roel Kluin62be1f72008-04-17 17:25:37 +0200686 gfs2_assert_withdraw(sdp, sdp->sd_log_blks_reserved + tr->tr_reserved >= reserved);
Steven Whitehouseac39aad2008-01-10 14:49:43 +0000687 unused = sdp->sd_log_blks_reserved - reserved + tr->tr_reserved;
Steven Whitehouseac39aad2008-01-10 14:49:43 +0000688 atomic_add(unused, &sdp->sd_log_blks_free);
Steven Whitehouse63997772009-06-12 08:49:20 +0100689 trace_gfs2_log_blocks(sdp, unused);
Steven Whitehousefd041f02007-11-08 14:55:03 +0000690 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
Robert Peterson2332c442007-06-18 14:50:20 -0500691 sdp->sd_jdesc->jd_blocks);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000692 sdp->sd_log_blks_reserved = reserved;
693
694 gfs2_log_unlock(sdp);
695}
696
697/**
698 * gfs2_log_commit - Commit a transaction to the log
699 * @sdp: the filesystem
700 * @tr: the transaction
701 *
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500702 * We wake up gfs2_logd if the number of pinned blocks exceed thresh1
703 * or the total number of used blocks (pinned blocks plus AIL blocks)
704 * is greater than thresh2.
705 *
706 * At mount time thresh1 is 1/3rd of journal size, thresh2 is 2/3rd of
707 * journal size.
708 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000709 * Returns: errno
710 */
711
712void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
713{
714 log_refund(sdp, tr);
Steven Whitehouse484adff2006-03-29 09:12:12 -0500715 up_read(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000716
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500717 if (atomic_read(&sdp->sd_log_pinned) > atomic_read(&sdp->sd_log_thresh1) ||
718 ((sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free)) >
719 atomic_read(&sdp->sd_log_thresh2)))
720 wake_up(&sdp->sd_logd_waitq);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000721}
722
723/**
724 * gfs2_log_shutdown - write a shutdown header into a journal
725 * @sdp: the filesystem
726 *
727 */
728
729void gfs2_log_shutdown(struct gfs2_sbd *sdp)
730{
Steven Whitehouse484adff2006-03-29 09:12:12 -0500731 down_write(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000732
David Teiglandb3b94fa2006-01-16 16:50:04 +0000733 gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000734 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000735 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
736 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg);
737 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf);
738 gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list));
739
740 sdp->sd_log_flush_head = sdp->sd_log_head;
741 sdp->sd_log_flush_wrapped = 0;
742
Steven Whitehousefdb76a42012-04-02 15:34:36 +0100743 log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000744
Steven Whitehousefd041f02007-11-08 14:55:03 +0000745 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
Steven Whitehousea74604b2006-04-21 15:10:46 -0400746 gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
747 gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000748
749 sdp->sd_log_head = sdp->sd_log_flush_head;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000750 sdp->sd_log_tail = sdp->sd_log_head;
751
Steven Whitehouse484adff2006-03-29 09:12:12 -0500752 up_write(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000753}
754
Steven Whitehousea25311c2006-11-23 11:06:35 -0500755
756/**
757 * gfs2_meta_syncfs - sync all the buffers in a filesystem
758 * @sdp: the filesystem
759 *
760 */
761
762void gfs2_meta_syncfs(struct gfs2_sbd *sdp)
763{
764 gfs2_log_flush(sdp, NULL);
765 for (;;) {
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500766 gfs2_ail1_start(sdp);
Steven Whitehouse26b06a62011-05-21 19:21:07 +0100767 gfs2_ail1_wait(sdp);
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100768 if (gfs2_ail1_empty(sdp))
Steven Whitehousea25311c2006-11-23 11:06:35 -0500769 break;
Steven Whitehousea25311c2006-11-23 11:06:35 -0500770 }
Steven Whitehouse380f7c62011-07-14 08:59:44 +0100771 gfs2_log_flush(sdp, NULL);
Steven Whitehousea25311c2006-11-23 11:06:35 -0500772}
773
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500774static inline int gfs2_jrnl_flush_reqd(struct gfs2_sbd *sdp)
775{
776 return (atomic_read(&sdp->sd_log_pinned) >= atomic_read(&sdp->sd_log_thresh1));
777}
778
779static inline int gfs2_ail_flush_reqd(struct gfs2_sbd *sdp)
780{
781 unsigned int used_blocks = sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free);
782 return used_blocks >= atomic_read(&sdp->sd_log_thresh2);
783}
Steven Whitehouseec69b182007-11-09 10:01:41 +0000784
785/**
786 * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks
787 * @sdp: Pointer to GFS2 superblock
788 *
789 * Also, periodically check to make sure that we're using the most recent
790 * journal index.
791 */
792
793int gfs2_logd(void *data)
794{
795 struct gfs2_sbd *sdp = data;
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500796 unsigned long t = 1;
797 DEFINE_WAIT(wait);
Steven Whitehouseec69b182007-11-09 10:01:41 +0000798
799 while (!kthread_should_stop()) {
Steven Whitehouseec69b182007-11-09 10:01:41 +0000800
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500801 if (gfs2_jrnl_flush_reqd(sdp) || t == 0) {
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100802 gfs2_ail1_empty(sdp);
Steven Whitehouseec69b182007-11-09 10:01:41 +0000803 gfs2_log_flush(sdp, NULL);
Steven Whitehouseec69b182007-11-09 10:01:41 +0000804 }
805
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500806 if (gfs2_ail_flush_reqd(sdp)) {
807 gfs2_ail1_start(sdp);
Steven Whitehouse26b06a62011-05-21 19:21:07 +0100808 gfs2_ail1_wait(sdp);
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100809 gfs2_ail1_empty(sdp);
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500810 gfs2_log_flush(sdp, NULL);
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500811 }
812
Steven Whitehouse26b06a62011-05-21 19:21:07 +0100813 if (!gfs2_ail_flush_reqd(sdp))
814 wake_up(&sdp->sd_log_waitq);
815
Steven Whitehouseec69b182007-11-09 10:01:41 +0000816 t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
Tejun Heoa0acae02011-11-21 12:32:22 -0800817
818 try_to_freeze();
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500819
820 do {
821 prepare_to_wait(&sdp->sd_logd_waitq, &wait,
Steven Whitehouse5f487492010-09-09 14:45:00 +0100822 TASK_INTERRUPTIBLE);
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500823 if (!gfs2_ail_flush_reqd(sdp) &&
824 !gfs2_jrnl_flush_reqd(sdp) &&
825 !kthread_should_stop())
826 t = schedule_timeout(t);
827 } while(t && !gfs2_ail_flush_reqd(sdp) &&
828 !gfs2_jrnl_flush_reqd(sdp) &&
829 !kthread_should_stop());
830 finish_wait(&sdp->sd_logd_waitq, &wait);
Steven Whitehouseec69b182007-11-09 10:01:41 +0000831 }
832
833 return 0;
834}
835