blob: 4d31379265cb8c97e0f6865c0fd0413921322ee9 [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>
David Teiglandb3b94fa2006-01-16 16:50:04 +000022
23#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050024#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000025#include "bmap.h"
26#include "glock.h"
27#include "log.h"
28#include "lops.h"
29#include "meta_io.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050030#include "util.h"
Steven Whitehouse71b86f52006-03-28 14:14:04 -050031#include "dir.h"
Steven Whitehouse63997772009-06-12 08:49:20 +010032#include "trace_gfs2.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000033
34#define PULL 1
35
David Teiglandb3b94fa2006-01-16 16:50:04 +000036/**
37 * gfs2_struct2blk - compute stuff
38 * @sdp: the filesystem
39 * @nstruct: the number of structures
40 * @ssize: the size of the structures
41 *
42 * Compute the number of log descriptor blocks needed to hold a certain number
43 * of structures of a certain size.
44 *
45 * Returns: the number of blocks needed (minimum is always 1)
46 */
47
48unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
49 unsigned int ssize)
50{
51 unsigned int blks;
52 unsigned int first, second;
53
54 blks = 1;
Steven Whitehousefaa31ce2006-09-13 11:13:27 -040055 first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / ssize;
David Teiglandb3b94fa2006-01-16 16:50:04 +000056
57 if (nstruct > first) {
Steven Whitehouse568f4c92006-02-27 12:00:42 -050058 second = (sdp->sd_sb.sb_bsize -
59 sizeof(struct gfs2_meta_header)) / ssize;
Steven Whitehouse5c676f62006-02-27 17:23:27 -050060 blks += DIV_ROUND_UP(nstruct - first, second);
David Teiglandb3b94fa2006-01-16 16:50:04 +000061 }
62
63 return blks;
64}
65
Steven Whitehouseddacfaf2006-10-03 11:10:41 -040066/**
Steven Whitehouse1e1a3d02007-08-27 09:45:26 +010067 * gfs2_remove_from_ail - Remove an entry from the ail lists, updating counters
68 * @mapping: The associated mapping (maybe NULL)
69 * @bd: The gfs2_bufdata to remove
70 *
Steven Whitehousec618e872011-03-14 12:40:29 +000071 * The ail lock _must_ be held when calling this function
Steven Whitehouse1e1a3d02007-08-27 09:45:26 +010072 *
73 */
74
Steven Whitehousef91a0d32007-10-15 16:29:05 +010075void gfs2_remove_from_ail(struct gfs2_bufdata *bd)
Steven Whitehouse1e1a3d02007-08-27 09:45:26 +010076{
77 bd->bd_ail = NULL;
Steven Whitehouse1ad38c42007-09-03 11:01:33 +010078 list_del_init(&bd->bd_ail_st_list);
79 list_del_init(&bd->bd_ail_gl_list);
Steven Whitehouse1e1a3d02007-08-27 09:45:26 +010080 atomic_dec(&bd->bd_gl->gl_ail_count);
Steven Whitehouse1e1a3d02007-08-27 09:45:26 +010081 brelse(bd->bd_bh);
82}
83
84/**
Steven Whitehouseddacfaf2006-10-03 11:10:41 -040085 * gfs2_ail1_start_one - Start I/O on a part of the AIL
86 * @sdp: the filesystem
Steven Whitehouse4667a0e2011-04-18 14:18:09 +010087 * @wbc: The writeback control structure
88 * @ai: The ail structure
Steven Whitehouseddacfaf2006-10-03 11:10:41 -040089 *
90 */
91
Steven Whitehouse4f1de012011-04-26 10:23:56 +010092static int gfs2_ail1_start_one(struct gfs2_sbd *sdp,
93 struct writeback_control *wbc,
94 struct gfs2_ail *ai)
Dave Chinnerd6a079e2011-03-11 11:52:25 +000095__releases(&sdp->sd_ail_lock)
96__acquires(&sdp->sd_ail_lock)
Steven Whitehouseddacfaf2006-10-03 11:10:41 -040097{
Steven Whitehouse5ac048b2011-03-30 16:25:51 +010098 struct gfs2_glock *gl = NULL;
Steven Whitehouse4667a0e2011-04-18 14:18:09 +010099 struct address_space *mapping;
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400100 struct gfs2_bufdata *bd, *s;
101 struct buffer_head *bh;
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400102
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100103 list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, bd_ail_st_list) {
104 bh = bd->bd_bh;
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400105
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100106 gfs2_assert(sdp, bd->bd_ail == ai);
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400107
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100108 if (!buffer_busy(bh)) {
109 if (!buffer_uptodate(bh))
110 gfs2_io_error_bh(sdp, bh);
111 list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
112 continue;
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400113 }
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100114
115 if (!buffer_dirty(bh))
116 continue;
117 if (gl == bd->bd_gl)
118 continue;
119 gl = bd->bd_gl;
120 list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list);
121 mapping = bh->b_page->mapping;
Steven Whitehouse4f1de012011-04-26 10:23:56 +0100122 if (!mapping)
123 continue;
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100124 spin_unlock(&sdp->sd_ail_lock);
125 generic_writepages(mapping, wbc);
126 spin_lock(&sdp->sd_ail_lock);
127 if (wbc->nr_to_write <= 0)
128 break;
Steven Whitehouse4f1de012011-04-26 10:23:56 +0100129 return 1;
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100130 }
Steven Whitehouse4f1de012011-04-26 10:23:56 +0100131
132 return 0;
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100133}
134
135
136/**
137 * gfs2_ail1_flush - start writeback of some ail1 entries
138 * @sdp: The super block
139 * @wbc: The writeback control structure
140 *
141 * Writes back some ail1 entries, according to the limits in the
142 * writeback control structure
143 */
144
145void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc)
146{
147 struct list_head *head = &sdp->sd_ail1_list;
148 struct gfs2_ail *ai;
149
Steven Whitehousec83ae9c2011-04-18 14:18:38 +0100150 trace_gfs2_ail_flush(sdp, wbc, 1);
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100151 spin_lock(&sdp->sd_ail_lock);
Steven Whitehouse4f1de012011-04-26 10:23:56 +0100152restart:
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100153 list_for_each_entry_reverse(ai, head, ai_list) {
154 if (wbc->nr_to_write <= 0)
155 break;
Steven Whitehouse4f1de012011-04-26 10:23:56 +0100156 if (gfs2_ail1_start_one(sdp, wbc, ai))
157 goto restart;
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100158 }
159 spin_unlock(&sdp->sd_ail_lock);
Steven Whitehousec83ae9c2011-04-18 14:18:38 +0100160 trace_gfs2_ail_flush(sdp, wbc, 0);
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100161}
162
163/**
164 * gfs2_ail1_start - start writeback of all ail1 entries
165 * @sdp: The superblock
166 */
167
168static void gfs2_ail1_start(struct gfs2_sbd *sdp)
169{
170 struct writeback_control wbc = {
171 .sync_mode = WB_SYNC_NONE,
172 .nr_to_write = LONG_MAX,
173 .range_start = 0,
174 .range_end = LLONG_MAX,
175 };
176
177 return gfs2_ail1_flush(sdp, &wbc);
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400178}
179
180/**
181 * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced
182 * @sdp: the filesystem
183 * @ai: the AIL entry
184 *
185 */
186
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100187static void gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400188{
189 struct gfs2_bufdata *bd, *s;
190 struct buffer_head *bh;
191
192 list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list,
193 bd_ail_st_list) {
194 bh = bd->bd_bh;
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400195 gfs2_assert(sdp, bd->bd_ail == ai);
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100196 if (buffer_busy(bh))
197 continue;
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400198 if (!buffer_uptodate(bh))
199 gfs2_io_error_bh(sdp, bh);
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400200 list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
201 }
202
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400203}
204
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100205/**
206 * gfs2_ail1_empty - Try to empty the ail1 lists
207 * @sdp: The superblock
208 *
209 * Tries to empty the ail1 lists, starting with the oldest first
210 */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000211
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100212static int gfs2_ail1_empty(struct gfs2_sbd *sdp)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000213{
214 struct gfs2_ail *ai, *s;
215 int ret;
216
Dave Chinnerd6a079e2011-03-11 11:52:25 +0000217 spin_lock(&sdp->sd_ail_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000218 list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) {
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100219 gfs2_ail1_empty_one(sdp, ai);
220 if (list_empty(&ai->ai_ail1_list))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000221 list_move(&ai->ai_list, &sdp->sd_ail2_list);
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100222 else
David Teiglandb3b94fa2006-01-16 16:50:04 +0000223 break;
224 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000225 ret = list_empty(&sdp->sd_ail1_list);
Dave Chinnerd6a079e2011-03-11 11:52:25 +0000226 spin_unlock(&sdp->sd_ail_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000227
228 return ret;
229}
230
Steven Whitehouse26b06a62011-05-21 19:21:07 +0100231static void gfs2_ail1_wait(struct gfs2_sbd *sdp)
232{
233 struct gfs2_ail *ai;
234 struct gfs2_bufdata *bd;
235 struct buffer_head *bh;
236
237 spin_lock(&sdp->sd_ail_lock);
238 list_for_each_entry_reverse(ai, &sdp->sd_ail1_list, ai_list) {
239 list_for_each_entry(bd, &ai->ai_ail1_list, bd_ail_st_list) {
240 bh = bd->bd_bh;
241 if (!buffer_locked(bh))
242 continue;
243 get_bh(bh);
244 spin_unlock(&sdp->sd_ail_lock);
245 wait_on_buffer(bh);
246 brelse(bh);
247 return;
248 }
249 }
250 spin_unlock(&sdp->sd_ail_lock);
251}
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400252
253/**
254 * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced
255 * @sdp: the filesystem
256 * @ai: the AIL entry
257 *
258 */
259
260static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
261{
262 struct list_head *head = &ai->ai_ail2_list;
263 struct gfs2_bufdata *bd;
264
265 while (!list_empty(head)) {
266 bd = list_entry(head->prev, struct gfs2_bufdata,
267 bd_ail_st_list);
268 gfs2_assert(sdp, bd->bd_ail == ai);
Steven Whitehousef91a0d32007-10-15 16:29:05 +0100269 gfs2_remove_from_ail(bd);
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400270 }
271}
272
David Teiglandb3b94fa2006-01-16 16:50:04 +0000273static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
274{
275 struct gfs2_ail *ai, *safe;
276 unsigned int old_tail = sdp->sd_log_tail;
277 int wrap = (new_tail < old_tail);
278 int a, b, rm;
279
Dave Chinnerd6a079e2011-03-11 11:52:25 +0000280 spin_lock(&sdp->sd_ail_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000281
282 list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) {
283 a = (old_tail <= ai->ai_first);
284 b = (ai->ai_first < new_tail);
285 rm = (wrap) ? (a || b) : (a && b);
286 if (!rm)
287 continue;
288
289 gfs2_ail2_empty_one(sdp, ai);
290 list_del(&ai->ai_list);
291 gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list));
292 gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list));
293 kfree(ai);
294 }
295
Dave Chinnerd6a079e2011-03-11 11:52:25 +0000296 spin_unlock(&sdp->sd_ail_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000297}
298
299/**
300 * gfs2_log_reserve - Make a log reservation
301 * @sdp: The GFS2 superblock
302 * @blks: The number of blocks to reserve
303 *
Steven Whitehouse89918642007-06-01 15:19:33 +0100304 * Note that we never give out the last few blocks of the journal. Thats
Robert Peterson2332c442007-06-18 14:50:20 -0500305 * due to the fact that there is a small number of header blocks
Steven Whitehouseb0041572006-11-23 10:51:34 -0500306 * associated with each log flush. The exact number can't be known until
307 * flush time, so we ensure that we have just enough free blocks at all
308 * times to avoid running out during a log flush.
309 *
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500310 * We no longer flush the log here, instead we wake up logd to do that
311 * for us. To avoid the thundering herd and to ensure that we deal fairly
312 * with queued waiters, we use an exclusive wait. This means that when we
313 * get woken with enough journal space to get our reservation, we need to
314 * wake the next waiter on the list.
315 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000316 * Returns: errno
317 */
318
319int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
320{
Steven Whitehouse89918642007-06-01 15:19:33 +0100321 unsigned reserved_blks = 6 * (4096 / sdp->sd_vfs->s_blocksize);
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500322 unsigned wanted = blks + reserved_blks;
323 DEFINE_WAIT(wait);
324 int did_wait = 0;
325 unsigned int free_blocks;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000326
327 if (gfs2_assert_warn(sdp, blks) ||
328 gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))
329 return -EINVAL;
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500330retry:
331 free_blocks = atomic_read(&sdp->sd_log_blks_free);
332 if (unlikely(free_blocks <= wanted)) {
333 do {
334 prepare_to_wait_exclusive(&sdp->sd_log_waitq, &wait,
335 TASK_UNINTERRUPTIBLE);
336 wake_up(&sdp->sd_logd_waitq);
337 did_wait = 1;
338 if (atomic_read(&sdp->sd_log_blks_free) <= wanted)
339 io_schedule();
340 free_blocks = atomic_read(&sdp->sd_log_blks_free);
341 } while(free_blocks <= wanted);
342 finish_wait(&sdp->sd_log_waitq, &wait);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000343 }
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500344 if (atomic_cmpxchg(&sdp->sd_log_blks_free, free_blocks,
345 free_blocks - blks) != free_blocks)
346 goto retry;
Steven Whitehouse63997772009-06-12 08:49:20 +0100347 trace_gfs2_log_blocks(sdp, -blks);
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500348
349 /*
350 * If we waited, then so might others, wake them up _after_ we get
351 * our share of the log.
352 */
353 if (unlikely(did_wait))
354 wake_up(&sdp->sd_log_waitq);
Steven Whitehouse484adff2006-03-29 09:12:12 -0500355
356 down_read(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000357
358 return 0;
359}
360
Steven Whitehouse47ac5532012-02-03 15:21:59 +0000361u64 gfs2_log_bmap(struct gfs2_sbd *sdp, unsigned int lbn)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000362{
Bob Petersonda6dd402007-12-11 18:49:21 -0600363 struct gfs2_journal_extent *je;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000364
Bob Petersonda6dd402007-12-11 18:49:21 -0600365 list_for_each_entry(je, &sdp->sd_jdesc->extent_list, extent_list) {
366 if (lbn >= je->lblock && lbn < je->lblock + je->blocks)
Steven Whitehouseff91cc92007-12-14 14:04:34 +0000367 return je->dblock + lbn - je->lblock;
Bob Petersonda6dd402007-12-11 18:49:21 -0600368 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000369
Bob Petersonda6dd402007-12-11 18:49:21 -0600370 return -1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000371}
372
373/**
374 * log_distance - Compute distance between two journal blocks
375 * @sdp: The GFS2 superblock
376 * @newer: The most recent journal block of the pair
377 * @older: The older journal block of the pair
378 *
379 * Compute the distance (in the journal direction) between two
380 * blocks in the journal
381 *
382 * Returns: the distance in blocks
383 */
384
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400385static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000386 unsigned int older)
387{
388 int dist;
389
390 dist = newer - older;
391 if (dist < 0)
392 dist += sdp->sd_jdesc->jd_blocks;
393
394 return dist;
395}
396
Robert Peterson2332c442007-06-18 14:50:20 -0500397/**
398 * calc_reserved - Calculate the number of blocks to reserve when
399 * refunding a transaction's unused buffers.
400 * @sdp: The GFS2 superblock
401 *
402 * This is complex. We need to reserve room for all our currently used
403 * metadata buffers (e.g. normal file I/O rewriting file time stamps) and
404 * all our journaled data buffers for journaled files (e.g. files in the
405 * meta_fs like rindex, or files for which chattr +j was done.)
406 * If we don't reserve enough space, gfs2_log_refund and gfs2_log_flush
407 * will count it as free space (sd_log_blks_free) and corruption will follow.
408 *
409 * We can have metadata bufs and jdata bufs in the same journal. So each
410 * type gets its own log header, for which we need to reserve a block.
411 * In fact, each type has the potential for needing more than one header
412 * in cases where we have more buffers than will fit on a journal page.
413 * Metadata journal entries take up half the space of journaled buffer entries.
414 * Thus, metadata entries have buf_limit (502) and journaled buffers have
415 * databuf_limit (251) before they cause a wrap around.
416 *
417 * Also, we need to reserve blocks for revoke journal entries and one for an
418 * overall header for the lot.
419 *
420 * Returns: the number of blocks reserved
421 */
422static unsigned int calc_reserved(struct gfs2_sbd *sdp)
423{
424 unsigned int reserved = 0;
425 unsigned int mbuf_limit, metabufhdrs_needed;
426 unsigned int dbuf_limit, databufhdrs_needed;
427 unsigned int revokes = 0;
428
429 mbuf_limit = buf_limit(sdp);
430 metabufhdrs_needed = (sdp->sd_log_commited_buf +
431 (mbuf_limit - 1)) / mbuf_limit;
432 dbuf_limit = databuf_limit(sdp);
433 databufhdrs_needed = (sdp->sd_log_commited_databuf +
434 (dbuf_limit - 1)) / dbuf_limit;
435
Benjamin Marzinski2e95e3f2010-03-10 18:10:19 -0600436 if (sdp->sd_log_commited_revoke > 0)
Robert Peterson2332c442007-06-18 14:50:20 -0500437 revokes = gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
438 sizeof(u64));
439
440 reserved = sdp->sd_log_commited_buf + metabufhdrs_needed +
441 sdp->sd_log_commited_databuf + databufhdrs_needed +
442 revokes;
443 /* One for the overall header */
444 if (reserved)
445 reserved++;
446 return reserved;
447}
448
David Teiglandb3b94fa2006-01-16 16:50:04 +0000449static unsigned int current_tail(struct gfs2_sbd *sdp)
450{
451 struct gfs2_ail *ai;
452 unsigned int tail;
453
Dave Chinnerd6a079e2011-03-11 11:52:25 +0000454 spin_lock(&sdp->sd_ail_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000455
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400456 if (list_empty(&sdp->sd_ail1_list)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000457 tail = sdp->sd_log_head;
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400458 } else {
459 ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail, ai_list);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000460 tail = ai->ai_first;
461 }
462
Dave Chinnerd6a079e2011-03-11 11:52:25 +0000463 spin_unlock(&sdp->sd_ail_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000464
465 return tail;
466}
467
Steven Whitehouse16615be2007-09-17 10:59:52 +0100468void gfs2_log_incr_head(struct gfs2_sbd *sdp)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000469{
Steven Whitehouse47ac5532012-02-03 15:21:59 +0000470 BUG_ON((sdp->sd_log_flush_head == sdp->sd_log_tail) &&
471 (sdp->sd_log_flush_head != sdp->sd_log_head));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000472
473 if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) {
474 sdp->sd_log_flush_head = 0;
475 sdp->sd_log_flush_wrapped = 1;
476 }
477}
478
Robert Peterson2332c442007-06-18 14:50:20 -0500479static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000480{
481 unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail);
482
483 ail2_empty(sdp, new_tail);
484
Steven Whitehousefd041f02007-11-08 14:55:03 +0000485 atomic_add(dist, &sdp->sd_log_blks_free);
Steven Whitehouse63997772009-06-12 08:49:20 +0100486 trace_gfs2_log_blocks(sdp, dist);
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500487 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
488 sdp->sd_jdesc->jd_blocks);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000489
490 sdp->sd_log_tail = new_tail;
491}
492
493/**
494 * log_write_header - Get and initialize a journal header buffer
495 * @sdp: The GFS2 superblock
496 *
497 * Returns: the initialized log buffer descriptor
498 */
499
Steven Whitehousecd915492006-09-04 12:49:07 -0400500static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000501{
Steven Whitehouse47ac5532012-02-03 15:21:59 +0000502 u64 blkno = gfs2_log_bmap(sdp, sdp->sd_log_flush_head);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000503 struct buffer_head *bh;
504 struct gfs2_log_header *lh;
505 unsigned int tail;
Steven Whitehousecd915492006-09-04 12:49:07 -0400506 u32 hash;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000507
David Teiglandb3b94fa2006-01-16 16:50:04 +0000508 bh = sb_getblk(sdp->sd_vfs, blkno);
509 lock_buffer(bh);
510 memset(bh->b_data, 0, bh->b_size);
511 set_buffer_uptodate(bh);
512 clear_buffer_dirty(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000513
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100514 gfs2_ail1_empty(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000515 tail = current_tail(sdp);
516
517 lh = (struct gfs2_log_header *)bh->b_data;
518 memset(lh, 0, sizeof(struct gfs2_log_header));
519 lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
Steven Whitehousee3167de2006-03-30 15:46:23 -0500520 lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH);
Steven Whitehouse0ab7d132009-11-06 16:20:51 +0000521 lh->lh_header.__pad0 = cpu_to_be64(0);
Steven Whitehousee3167de2006-03-30 15:46:23 -0500522 lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH);
Steven Whitehouse0ab7d132009-11-06 16:20:51 +0000523 lh->lh_header.mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
Steven Whitehousee0f2bf72006-07-17 09:36:28 -0400524 lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++);
525 lh->lh_flags = cpu_to_be32(flags);
526 lh->lh_tail = cpu_to_be32(tail);
527 lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000528 hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header));
529 lh->lh_hash = cpu_to_be32(hash);
530
Steven Whitehouse254db572008-09-26 10:23:22 +0100531 bh->b_end_io = end_buffer_write_sync;
Steven Whitehouse254db572008-09-26 10:23:22 +0100532 get_bh(bh);
Christoph Hellwigf1e4d512010-08-18 05:29:13 -0400533 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
Christoph Hellwig65299a32011-08-23 14:50:29 +0200534 submit_bh(WRITE_SYNC | REQ_META | REQ_PRIO, bh);
Christoph Hellwigf1e4d512010-08-18 05:29:13 -0400535 else
Steven Whitehouse20ed0532011-10-31 09:52:02 +0000536 submit_bh(WRITE_FLUSH_FUA | REQ_META, bh);
Christoph Hellwigf1e4d512010-08-18 05:29:13 -0400537 wait_on_buffer(bh);
538
Steven Whitehouse254db572008-09-26 10:23:22 +0100539 if (!buffer_uptodate(bh))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000540 gfs2_io_error_bh(sdp, bh);
541 brelse(bh);
542
543 if (sdp->sd_log_tail != tail)
Robert Peterson2332c442007-06-18 14:50:20 -0500544 log_pull_tail(sdp, tail);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000545 else
546 gfs2_assert_withdraw(sdp, !pull);
547
548 sdp->sd_log_idle = (tail == sdp->sd_log_flush_head);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100549 gfs2_log_incr_head(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000550}
551
552static void log_flush_commit(struct gfs2_sbd *sdp)
553{
Steven Whitehouse16615be2007-09-17 10:59:52 +0100554 DEFINE_WAIT(wait);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000555
Steven Whitehouse16615be2007-09-17 10:59:52 +0100556 if (atomic_read(&sdp->sd_log_in_flight)) {
557 do {
558 prepare_to_wait(&sdp->sd_log_flush_wait, &wait,
559 TASK_UNINTERRUPTIBLE);
560 if (atomic_read(&sdp->sd_log_in_flight))
561 io_schedule();
562 } while(atomic_read(&sdp->sd_log_in_flight));
563 finish_wait(&sdp->sd_log_flush_wait, &wait);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000564 }
565
Steven Whitehouse16615be2007-09-17 10:59:52 +0100566 log_write_header(sdp, 0, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000567}
568
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100569static void gfs2_ordered_write(struct gfs2_sbd *sdp)
570{
571 struct gfs2_bufdata *bd;
572 struct buffer_head *bh;
573 LIST_HEAD(written);
574
575 gfs2_log_lock(sdp);
576 while (!list_empty(&sdp->sd_log_le_ordered)) {
577 bd = list_entry(sdp->sd_log_le_ordered.next, struct gfs2_bufdata, bd_le.le_list);
578 list_move(&bd->bd_le.le_list, &written);
579 bh = bd->bd_bh;
580 if (!buffer_dirty(bh))
581 continue;
582 get_bh(bh);
583 gfs2_log_unlock(sdp);
584 lock_buffer(bh);
Steven Whitehouseb8e7cbb2007-10-17 09:04:24 +0100585 if (buffer_mapped(bh) && test_clear_buffer_dirty(bh)) {
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100586 bh->b_end_io = end_buffer_write_sync;
Jens Axboe721a9602011-03-09 11:56:30 +0100587 submit_bh(WRITE_SYNC, bh);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100588 } else {
589 unlock_buffer(bh);
590 brelse(bh);
591 }
592 gfs2_log_lock(sdp);
593 }
594 list_splice(&written, &sdp->sd_log_le_ordered);
595 gfs2_log_unlock(sdp);
596}
597
598static void gfs2_ordered_wait(struct gfs2_sbd *sdp)
599{
600 struct gfs2_bufdata *bd;
601 struct buffer_head *bh;
602
603 gfs2_log_lock(sdp);
604 while (!list_empty(&sdp->sd_log_le_ordered)) {
605 bd = list_entry(sdp->sd_log_le_ordered.prev, struct gfs2_bufdata, bd_le.le_list);
606 bh = bd->bd_bh;
607 if (buffer_locked(bh)) {
608 get_bh(bh);
609 gfs2_log_unlock(sdp);
610 wait_on_buffer(bh);
611 brelse(bh);
612 gfs2_log_lock(sdp);
613 continue;
614 }
615 list_del_init(&bd->bd_le.le_list);
616 }
617 gfs2_log_unlock(sdp);
618}
619
David Teiglandb3b94fa2006-01-16 16:50:04 +0000620/**
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400621 * gfs2_log_flush - flush incore transaction(s)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000622 * @sdp: the filesystem
623 * @gl: The glock structure to flush. If NULL, flush the whole incore log
624 *
625 */
626
Bob Petersoned4878e2010-05-20 23:30:11 -0400627void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000628{
629 struct gfs2_ail *ai;
630
Steven Whitehouse484adff2006-03-29 09:12:12 -0500631 down_write(&sdp->sd_log_flush_lock);
Steven Whitehousef55ab262006-02-21 12:51:39 +0000632
Steven Whitehouse2bcd6102007-11-08 14:25:12 +0000633 /* Log might have been flushed while we waited for the flush lock */
634 if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) {
635 up_write(&sdp->sd_log_flush_lock);
636 return;
Steven Whitehousef55ab262006-02-21 12:51:39 +0000637 }
Steven Whitehouse63997772009-06-12 08:49:20 +0100638 trace_gfs2_log_flush(sdp, 1);
Steven Whitehousef55ab262006-02-21 12:51:39 +0000639
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400640 ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL);
641 INIT_LIST_HEAD(&ai->ai_ail1_list);
642 INIT_LIST_HEAD(&ai->ai_ail2_list);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000643
Steven Whitehouse16615be2007-09-17 10:59:52 +0100644 if (sdp->sd_log_num_buf != sdp->sd_log_commited_buf) {
645 printk(KERN_INFO "GFS2: log buf %u %u\n", sdp->sd_log_num_buf,
646 sdp->sd_log_commited_buf);
647 gfs2_assert_withdraw(sdp, 0);
648 }
649 if (sdp->sd_log_num_databuf != sdp->sd_log_commited_databuf) {
650 printk(KERN_INFO "GFS2: log databuf %u %u\n",
651 sdp->sd_log_num_databuf, sdp->sd_log_commited_databuf);
652 gfs2_assert_withdraw(sdp, 0);
653 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000654 gfs2_assert_withdraw(sdp,
655 sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke);
656
David Teiglandb3b94fa2006-01-16 16:50:04 +0000657 sdp->sd_log_flush_head = sdp->sd_log_head;
658 sdp->sd_log_flush_wrapped = 0;
659 ai->ai_first = sdp->sd_log_flush_head;
660
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100661 gfs2_ordered_write(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000662 lops_before_commit(sdp);
Steven Whitehoused7b616e2007-09-02 10:48:13 +0100663 gfs2_ordered_wait(sdp);
664
Steven Whitehouse16615be2007-09-17 10:59:52 +0100665 if (sdp->sd_log_head != sdp->sd_log_flush_head)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000666 log_flush_commit(sdp);
Robert Peterson2332c442007-06-18 14:50:20 -0500667 else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){
668 gfs2_log_lock(sdp);
Steven Whitehousefd041f02007-11-08 14:55:03 +0000669 atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
Steven Whitehouse63997772009-06-12 08:49:20 +0100670 trace_gfs2_log_blocks(sdp, -1);
Robert Peterson2332c442007-06-18 14:50:20 -0500671 gfs2_log_unlock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000672 log_write_header(sdp, 0, PULL);
Robert Peterson2332c442007-06-18 14:50:20 -0500673 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000674 lops_after_commit(sdp, ai);
Steven Whitehousefe1a6982006-10-11 13:34:59 -0400675
676 gfs2_log_lock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000677 sdp->sd_log_head = sdp->sd_log_flush_head;
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400678 sdp->sd_log_blks_reserved = 0;
679 sdp->sd_log_commited_buf = 0;
Robert Peterson2332c442007-06-18 14:50:20 -0500680 sdp->sd_log_commited_databuf = 0;
Steven Whitehousefaa31ce2006-09-13 11:13:27 -0400681 sdp->sd_log_commited_revoke = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000682
Dave Chinnerd6a079e2011-03-11 11:52:25 +0000683 spin_lock(&sdp->sd_ail_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000684 if (!list_empty(&ai->ai_ail1_list)) {
685 list_add(&ai->ai_list, &sdp->sd_ail1_list);
686 ai = NULL;
687 }
Dave Chinnerd6a079e2011-03-11 11:52:25 +0000688 spin_unlock(&sdp->sd_ail_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000689 gfs2_log_unlock(sdp);
Steven Whitehouse63997772009-06-12 08:49:20 +0100690 trace_gfs2_log_flush(sdp, 0);
Steven Whitehouse484adff2006-03-29 09:12:12 -0500691 up_write(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000692
693 kfree(ai);
694}
695
696static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
697{
Robert Peterson2332c442007-06-18 14:50:20 -0500698 unsigned int reserved;
Steven Whitehouseac39aad2008-01-10 14:49:43 +0000699 unsigned int unused;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000700
701 gfs2_log_lock(sdp);
702
703 sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm;
Robert Peterson2332c442007-06-18 14:50:20 -0500704 sdp->sd_log_commited_databuf += tr->tr_num_databuf_new -
705 tr->tr_num_databuf_rm;
706 gfs2_assert_withdraw(sdp, (((int)sdp->sd_log_commited_buf) >= 0) ||
707 (((int)sdp->sd_log_commited_databuf) >= 0));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000708 sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
Robert Peterson2332c442007-06-18 14:50:20 -0500709 reserved = calc_reserved(sdp);
Roel Kluin62be1f72008-04-17 17:25:37 +0200710 gfs2_assert_withdraw(sdp, sdp->sd_log_blks_reserved + tr->tr_reserved >= reserved);
Steven Whitehouseac39aad2008-01-10 14:49:43 +0000711 unused = sdp->sd_log_blks_reserved - reserved + tr->tr_reserved;
Steven Whitehouseac39aad2008-01-10 14:49:43 +0000712 atomic_add(unused, &sdp->sd_log_blks_free);
Steven Whitehouse63997772009-06-12 08:49:20 +0100713 trace_gfs2_log_blocks(sdp, unused);
Steven Whitehousefd041f02007-11-08 14:55:03 +0000714 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
Robert Peterson2332c442007-06-18 14:50:20 -0500715 sdp->sd_jdesc->jd_blocks);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000716 sdp->sd_log_blks_reserved = reserved;
717
718 gfs2_log_unlock(sdp);
719}
720
Bob Petersond0109bf2008-01-28 11:20:10 -0600721static void buf_lo_incore_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
722{
723 struct list_head *head = &tr->tr_list_buf;
724 struct gfs2_bufdata *bd;
725
726 gfs2_log_lock(sdp);
727 while (!list_empty(head)) {
728 bd = list_entry(head->next, struct gfs2_bufdata, bd_list_tr);
729 list_del_init(&bd->bd_list_tr);
730 tr->tr_num_buf--;
731 }
732 gfs2_log_unlock(sdp);
733 gfs2_assert_warn(sdp, !tr->tr_num_buf);
734}
735
David Teiglandb3b94fa2006-01-16 16:50:04 +0000736/**
737 * gfs2_log_commit - Commit a transaction to the log
738 * @sdp: the filesystem
739 * @tr: the transaction
740 *
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500741 * We wake up gfs2_logd if the number of pinned blocks exceed thresh1
742 * or the total number of used blocks (pinned blocks plus AIL blocks)
743 * is greater than thresh2.
744 *
745 * At mount time thresh1 is 1/3rd of journal size, thresh2 is 2/3rd of
746 * journal size.
747 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000748 * Returns: errno
749 */
750
751void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
752{
753 log_refund(sdp, tr);
Bob Petersond0109bf2008-01-28 11:20:10 -0600754 buf_lo_incore_commit(sdp, tr);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000755
Steven Whitehouse484adff2006-03-29 09:12:12 -0500756 up_read(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000757
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500758 if (atomic_read(&sdp->sd_log_pinned) > atomic_read(&sdp->sd_log_thresh1) ||
759 ((sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free)) >
760 atomic_read(&sdp->sd_log_thresh2)))
761 wake_up(&sdp->sd_logd_waitq);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000762}
763
764/**
765 * gfs2_log_shutdown - write a shutdown header into a journal
766 * @sdp: the filesystem
767 *
768 */
769
770void gfs2_log_shutdown(struct gfs2_sbd *sdp)
771{
Steven Whitehouse484adff2006-03-29 09:12:12 -0500772 down_write(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000773
David Teiglandb3b94fa2006-01-16 16:50:04 +0000774 gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000775 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000776 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
777 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg);
778 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf);
779 gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list));
780
781 sdp->sd_log_flush_head = sdp->sd_log_head;
782 sdp->sd_log_flush_wrapped = 0;
783
Robert Peterson2332c442007-06-18 14:50:20 -0500784 log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT,
785 (sdp->sd_log_tail == current_tail(sdp)) ? 0 : PULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000786
Steven Whitehousefd041f02007-11-08 14:55:03 +0000787 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
Steven Whitehousea74604b2006-04-21 15:10:46 -0400788 gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
789 gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000790
791 sdp->sd_log_head = sdp->sd_log_flush_head;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000792 sdp->sd_log_tail = sdp->sd_log_head;
793
Steven Whitehouse484adff2006-03-29 09:12:12 -0500794 up_write(&sdp->sd_log_flush_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000795}
796
Steven Whitehousea25311c2006-11-23 11:06:35 -0500797
798/**
799 * gfs2_meta_syncfs - sync all the buffers in a filesystem
800 * @sdp: the filesystem
801 *
802 */
803
804void gfs2_meta_syncfs(struct gfs2_sbd *sdp)
805{
806 gfs2_log_flush(sdp, NULL);
807 for (;;) {
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500808 gfs2_ail1_start(sdp);
Steven Whitehouse26b06a62011-05-21 19:21:07 +0100809 gfs2_ail1_wait(sdp);
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100810 if (gfs2_ail1_empty(sdp))
Steven Whitehousea25311c2006-11-23 11:06:35 -0500811 break;
Steven Whitehousea25311c2006-11-23 11:06:35 -0500812 }
Steven Whitehouse380f7c62011-07-14 08:59:44 +0100813 gfs2_log_flush(sdp, NULL);
Steven Whitehousea25311c2006-11-23 11:06:35 -0500814}
815
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500816static inline int gfs2_jrnl_flush_reqd(struct gfs2_sbd *sdp)
817{
818 return (atomic_read(&sdp->sd_log_pinned) >= atomic_read(&sdp->sd_log_thresh1));
819}
820
821static inline int gfs2_ail_flush_reqd(struct gfs2_sbd *sdp)
822{
823 unsigned int used_blocks = sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free);
824 return used_blocks >= atomic_read(&sdp->sd_log_thresh2);
825}
Steven Whitehouseec69b182007-11-09 10:01:41 +0000826
827/**
828 * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks
829 * @sdp: Pointer to GFS2 superblock
830 *
831 * Also, periodically check to make sure that we're using the most recent
832 * journal index.
833 */
834
835int gfs2_logd(void *data)
836{
837 struct gfs2_sbd *sdp = data;
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500838 unsigned long t = 1;
839 DEFINE_WAIT(wait);
840 unsigned preflush;
Steven Whitehouseec69b182007-11-09 10:01:41 +0000841
842 while (!kthread_should_stop()) {
Steven Whitehouseec69b182007-11-09 10:01:41 +0000843
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500844 preflush = atomic_read(&sdp->sd_log_pinned);
845 if (gfs2_jrnl_flush_reqd(sdp) || t == 0) {
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100846 gfs2_ail1_empty(sdp);
Steven Whitehouseec69b182007-11-09 10:01:41 +0000847 gfs2_log_flush(sdp, NULL);
Steven Whitehouseec69b182007-11-09 10:01:41 +0000848 }
849
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500850 if (gfs2_ail_flush_reqd(sdp)) {
851 gfs2_ail1_start(sdp);
Steven Whitehouse26b06a62011-05-21 19:21:07 +0100852 gfs2_ail1_wait(sdp);
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100853 gfs2_ail1_empty(sdp);
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500854 gfs2_log_flush(sdp, NULL);
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500855 }
856
Steven Whitehouse26b06a62011-05-21 19:21:07 +0100857 if (!gfs2_ail_flush_reqd(sdp))
858 wake_up(&sdp->sd_log_waitq);
859
Steven Whitehouseec69b182007-11-09 10:01:41 +0000860 t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
Tejun Heoa0acae02011-11-21 12:32:22 -0800861
862 try_to_freeze();
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500863
864 do {
865 prepare_to_wait(&sdp->sd_logd_waitq, &wait,
Steven Whitehouse5f487492010-09-09 14:45:00 +0100866 TASK_INTERRUPTIBLE);
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -0500867 if (!gfs2_ail_flush_reqd(sdp) &&
868 !gfs2_jrnl_flush_reqd(sdp) &&
869 !kthread_should_stop())
870 t = schedule_timeout(t);
871 } while(t && !gfs2_ail_flush_reqd(sdp) &&
872 !gfs2_jrnl_flush_reqd(sdp) &&
873 !kthread_should_stop());
874 finish_wait(&sdp->sd_logd_waitq, &wait);
Steven Whitehouseec69b182007-11-09 10:01:41 +0000875 }
876
877 return 0;
878}
879