blob: 75716d3d2be0351fde4a5953360a5a0c2774f4ae [file] [log] [blame]
Dave Kleikamp470decc2006-10-11 01:20:57 -07001/*
Mingming Caof7f4bcc2006-10-11 01:20:59 -07002 * linux/fs/jbd2/commit.c
Dave Kleikamp470decc2006-10-11 01:20:57 -07003 *
4 * Written by Stephen C. Tweedie <sct@redhat.com>, 1998
5 *
6 * Copyright 1998 Red Hat corp --- All Rights Reserved
7 *
8 * This file is part of the Linux kernel and is made available under
9 * the terms of the GNU General Public License, version 2, or at your
10 * option, any later version, incorporated herein by reference.
11 *
12 * Journal commit routines for the generic filesystem journaling code;
13 * part of the ext2fs journaling system.
14 */
15
16#include <linux/time.h>
17#include <linux/fs.h>
Mingming Caof7f4bcc2006-10-11 01:20:59 -070018#include <linux/jbd2.h>
Dave Kleikamp470decc2006-10-11 01:20:57 -070019#include <linux/errno.h>
20#include <linux/slab.h>
21#include <linux/mm.h>
22#include <linux/pagemap.h>
Johann Lombardi8e85fb32008-01-28 23:58:27 -050023#include <linux/jiffies.h>
Girish Shilamkar818d2762008-01-28 23:58:27 -050024#include <linux/crc32.h>
Aneesh Kumar K.Vcd1aac32008-07-11 19:27:31 -040025#include <linux/writeback.h>
26#include <linux/backing-dev.h>
Theodore Ts'ofd984962009-01-05 21:34:13 -050027#include <linux/bio.h>
Theodore Ts'o0e3d2a62009-09-11 09:30:12 -040028#include <linux/blkdev.h>
Theodore Ts'o879c5e62009-06-17 11:47:48 -040029#include <trace/events/jbd2.h>
Dave Kleikamp470decc2006-10-11 01:20:57 -070030
31/*
32 * Default IO end handler for temporary BJ_IO buffer_heads.
33 */
34static void journal_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
35{
36 BUFFER_TRACE(bh, "");
37 if (uptodate)
38 set_buffer_uptodate(bh);
39 else
40 clear_buffer_uptodate(bh);
41 unlock_buffer(bh);
42}
43
44/*
Jan Kara87c89c22008-07-11 19:27:31 -040045 * When an ext4 file is truncated, it is possible that some pages are not
46 * successfully freed, because they are attached to a committing transaction.
Dave Kleikamp470decc2006-10-11 01:20:57 -070047 * After the transaction commits, these pages are left on the LRU, with no
48 * ->mapping, and with attached buffers. These pages are trivially reclaimable
49 * by the VM, but their apparent absence upsets the VM accounting, and it makes
50 * the numbers in /proc/meminfo look odd.
51 *
52 * So here, we have a buffer which has just come off the forget list. Look to
53 * see if we can strip all buffers from the backing page.
54 *
55 * Called under lock_journal(), and possibly under journal_datalist_lock. The
56 * caller provided us with a ref against the buffer, and we drop that here.
57 */
58static void release_buffer_page(struct buffer_head *bh)
59{
60 struct page *page;
61
62 if (buffer_dirty(bh))
63 goto nope;
64 if (atomic_read(&bh->b_count) != 1)
65 goto nope;
66 page = bh->b_page;
67 if (!page)
68 goto nope;
69 if (page->mapping)
70 goto nope;
71
72 /* OK, it's a truncated page */
Nick Piggin529ae9a2008-08-02 12:01:03 +020073 if (!trylock_page(page))
Dave Kleikamp470decc2006-10-11 01:20:57 -070074 goto nope;
75
76 page_cache_get(page);
77 __brelse(bh);
78 try_to_free_buffers(page);
79 unlock_page(page);
80 page_cache_release(page);
81 return;
82
83nope:
84 __brelse(bh);
85}
86
87/*
Girish Shilamkar818d2762008-01-28 23:58:27 -050088 * Done it all: now submit the commit record. We should have
Dave Kleikamp470decc2006-10-11 01:20:57 -070089 * cleaned up our previous buffers by now, so if we are in abort
90 * mode we can now just skip the rest of the journal write
91 * entirely.
92 *
93 * Returns 1 if the journal needs to be aborted or 0 on success
94 */
Girish Shilamkar818d2762008-01-28 23:58:27 -050095static int journal_submit_commit_record(journal_t *journal,
96 transaction_t *commit_transaction,
97 struct buffer_head **cbh,
98 __u32 crc32_sum)
Dave Kleikamp470decc2006-10-11 01:20:57 -070099{
100 struct journal_head *descriptor;
Girish Shilamkar818d2762008-01-28 23:58:27 -0500101 struct commit_header *tmp;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700102 struct buffer_head *bh;
Girish Shilamkar818d2762008-01-28 23:58:27 -0500103 int ret;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700104 int barrier_done = 0;
Theodore Ts'o736603a2008-07-11 19:27:31 -0400105 struct timespec now = current_kernel_time();
Dave Kleikamp470decc2006-10-11 01:20:57 -0700106
107 if (is_journal_aborted(journal))
108 return 0;
109
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700110 descriptor = jbd2_journal_get_descriptor_buffer(journal);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700111 if (!descriptor)
112 return 1;
113
114 bh = jh2bh(descriptor);
115
Girish Shilamkar818d2762008-01-28 23:58:27 -0500116 tmp = (struct commit_header *)bh->b_data;
117 tmp->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER);
118 tmp->h_blocktype = cpu_to_be32(JBD2_COMMIT_BLOCK);
119 tmp->h_sequence = cpu_to_be32(commit_transaction->t_tid);
Theodore Ts'o736603a2008-07-11 19:27:31 -0400120 tmp->h_commit_sec = cpu_to_be64(now.tv_sec);
121 tmp->h_commit_nsec = cpu_to_be32(now.tv_nsec);
Girish Shilamkar818d2762008-01-28 23:58:27 -0500122
123 if (JBD2_HAS_COMPAT_FEATURE(journal,
124 JBD2_FEATURE_COMPAT_CHECKSUM)) {
125 tmp->h_chksum_type = JBD2_CRC32_CHKSUM;
126 tmp->h_chksum_size = JBD2_CRC32_CHKSUM_SIZE;
127 tmp->h_chksum[0] = cpu_to_be32(crc32_sum);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700128 }
129
Girish Shilamkar818d2762008-01-28 23:58:27 -0500130 JBUFFER_TRACE(descriptor, "submit commit block");
131 lock_buffer(bh);
Theodore Ts'o45a90bf2008-10-06 12:04:02 -0400132 clear_buffer_dirty(bh);
Girish Shilamkar818d2762008-01-28 23:58:27 -0500133 set_buffer_uptodate(bh);
134 bh->b_end_io = journal_end_buffer_io_sync;
135
136 if (journal->j_flags & JBD2_BARRIER &&
Theodore Ts'o0e3d2a62009-09-11 09:30:12 -0400137 !JBD2_HAS_INCOMPAT_FEATURE(journal,
138 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) {
Dave Kleikamp470decc2006-10-11 01:20:57 -0700139 set_buffer_ordered(bh);
140 barrier_done = 1;
141 }
Jens Axboe4194b1e2009-04-06 14:48:05 +0200142 ret = submit_bh(WRITE_SYNC_PLUG, bh);
Dave Kleikampc4e35e072008-02-10 01:09:32 -0500143 if (barrier_done)
144 clear_buffer_ordered(bh);
Girish Shilamkar818d2762008-01-28 23:58:27 -0500145
Dave Kleikamp470decc2006-10-11 01:20:57 -0700146 /* is it possible for another commit to fail at roughly
147 * the same time as this one? If so, we don't want to
148 * trust the barrier flag in the super, but instead want
149 * to remember if we sent a barrier request
150 */
151 if (ret == -EOPNOTSUPP && barrier_done) {
Dave Kleikamp470decc2006-10-11 01:20:57 -0700152 printk(KERN_WARNING
Theodore Ts'o05496762008-09-16 14:36:17 -0400153 "JBD: barrier-based sync failed on %s - "
154 "disabling barriers\n", journal->j_devname);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700155 spin_lock(&journal->j_state_lock);
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700156 journal->j_flags &= ~JBD2_BARRIER;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700157 spin_unlock(&journal->j_state_lock);
158
159 /* And try again, without the barrier */
Theodore Ts'o034772b2008-06-03 22:31:11 -0400160 lock_buffer(bh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700161 set_buffer_uptodate(bh);
Theodore Ts'o45a90bf2008-10-06 12:04:02 -0400162 clear_buffer_dirty(bh);
Jens Axboe4194b1e2009-04-06 14:48:05 +0200163 ret = submit_bh(WRITE_SYNC_PLUG, bh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700164 }
Girish Shilamkar818d2762008-01-28 23:58:27 -0500165 *cbh = bh;
166 return ret;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700167}
168
Girish Shilamkar818d2762008-01-28 23:58:27 -0500169/*
170 * This function along with journal_submit_commit_record
171 * allows to write the commit record asynchronously.
172 */
Theodore Ts'ofd984962009-01-05 21:34:13 -0500173static int journal_wait_on_commit_record(journal_t *journal,
174 struct buffer_head *bh)
Girish Shilamkar818d2762008-01-28 23:58:27 -0500175{
176 int ret = 0;
177
Theodore Ts'ofd984962009-01-05 21:34:13 -0500178retry:
Girish Shilamkar818d2762008-01-28 23:58:27 -0500179 clear_buffer_dirty(bh);
180 wait_on_buffer(bh);
Theodore Ts'ofd984962009-01-05 21:34:13 -0500181 if (buffer_eopnotsupp(bh) && (journal->j_flags & JBD2_BARRIER)) {
182 printk(KERN_WARNING
183 "JBD2: wait_on_commit_record: sync failed on %s - "
184 "disabling barriers\n", journal->j_devname);
185 spin_lock(&journal->j_state_lock);
186 journal->j_flags &= ~JBD2_BARRIER;
187 spin_unlock(&journal->j_state_lock);
188
189 lock_buffer(bh);
190 clear_buffer_dirty(bh);
191 set_buffer_uptodate(bh);
192 bh->b_end_io = journal_end_buffer_io_sync;
193
Jens Axboe4194b1e2009-04-06 14:48:05 +0200194 ret = submit_bh(WRITE_SYNC_PLUG, bh);
Theodore Ts'ofd984962009-01-05 21:34:13 -0500195 if (ret) {
196 unlock_buffer(bh);
197 return ret;
198 }
199 goto retry;
200 }
Girish Shilamkar818d2762008-01-28 23:58:27 -0500201
202 if (unlikely(!buffer_uptodate(bh)))
203 ret = -EIO;
204 put_bh(bh); /* One for getblk() */
205 jbd2_journal_put_journal_head(bh2jh(bh));
206
207 return ret;
208}
209
210/*
Aneesh Kumar K.Vcd1aac32008-07-11 19:27:31 -0400211 * write the filemap data using writepage() address_space_operations.
212 * We don't do block allocation here even for delalloc. We don't
213 * use writepages() because with dealyed allocation we may be doing
214 * block allocation in writepages().
215 */
216static int journal_submit_inode_data_buffers(struct address_space *mapping)
217{
218 int ret;
219 struct writeback_control wbc = {
220 .sync_mode = WB_SYNC_ALL,
221 .nr_to_write = mapping->nrpages * 2,
222 .range_start = 0,
223 .range_end = i_size_read(mapping->host),
Aneesh Kumar K.Vcd1aac32008-07-11 19:27:31 -0400224 };
225
226 ret = generic_writepages(mapping, &wbc);
227 return ret;
228}
229
230/*
Jan Karac851ed52008-07-11 19:27:31 -0400231 * Submit all the data buffers of inode associated with the transaction to
232 * disk.
233 *
234 * We are in a committing transaction. Therefore no new inode can be added to
235 * our inode list. We use JI_COMMIT_RUNNING flag to protect inode we currently
236 * operate on from being released while we write out pages.
237 */
Aneesh Kumar K.Vcd1aac32008-07-11 19:27:31 -0400238static int journal_submit_data_buffers(journal_t *journal,
Jan Karac851ed52008-07-11 19:27:31 -0400239 transaction_t *commit_transaction)
240{
241 struct jbd2_inode *jinode;
242 int err, ret = 0;
243 struct address_space *mapping;
244
245 spin_lock(&journal->j_list_lock);
246 list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) {
247 mapping = jinode->i_vfs_inode->i_mapping;
248 jinode->i_flags |= JI_COMMIT_RUNNING;
249 spin_unlock(&journal->j_list_lock);
Aneesh Kumar K.Vcd1aac32008-07-11 19:27:31 -0400250 /*
251 * submit the inode data buffers. We use writepage
252 * instead of writepages. Because writepages can do
253 * block allocation with delalloc. We need to write
254 * only allocated blocks here.
255 */
Theodore Ts'o879c5e62009-06-17 11:47:48 -0400256 trace_jbd2_submit_inode_data(jinode->i_vfs_inode);
Aneesh Kumar K.Vcd1aac32008-07-11 19:27:31 -0400257 err = journal_submit_inode_data_buffers(mapping);
Jan Karac851ed52008-07-11 19:27:31 -0400258 if (!ret)
259 ret = err;
260 spin_lock(&journal->j_list_lock);
261 J_ASSERT(jinode->i_transaction == commit_transaction);
Theodore Ts'occ3e1be2009-12-23 06:52:08 -0500262 commit_transaction->t_flushed_data_blocks = 1;
Jan Karac851ed52008-07-11 19:27:31 -0400263 jinode->i_flags &= ~JI_COMMIT_RUNNING;
264 wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING);
265 }
266 spin_unlock(&journal->j_list_lock);
267 return ret;
268}
269
270/*
271 * Wait for data submitted for writeout, refile inodes to proper
272 * transaction if needed.
273 *
274 */
275static int journal_finish_inode_data_buffers(journal_t *journal,
276 transaction_t *commit_transaction)
277{
278 struct jbd2_inode *jinode, *next_i;
279 int err, ret = 0;
280
Aneesh Kumar K.Vcd1aac32008-07-11 19:27:31 -0400281 /* For locking, see the comment in journal_submit_data_buffers() */
Jan Karac851ed52008-07-11 19:27:31 -0400282 spin_lock(&journal->j_list_lock);
283 list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) {
284 jinode->i_flags |= JI_COMMIT_RUNNING;
285 spin_unlock(&journal->j_list_lock);
286 err = filemap_fdatawait(jinode->i_vfs_inode->i_mapping);
Hidehiro Kawaie9e34f42008-07-31 22:26:04 -0400287 if (err) {
288 /*
289 * Because AS_EIO is cleared by
Christoph Hellwig94004ed2009-09-30 22:16:33 +0200290 * filemap_fdatawait_range(), set it again so
Hidehiro Kawaie9e34f42008-07-31 22:26:04 -0400291 * that user process can get -EIO from fsync().
292 */
293 set_bit(AS_EIO,
294 &jinode->i_vfs_inode->i_mapping->flags);
295
296 if (!ret)
297 ret = err;
298 }
Jan Karac851ed52008-07-11 19:27:31 -0400299 spin_lock(&journal->j_list_lock);
300 jinode->i_flags &= ~JI_COMMIT_RUNNING;
301 wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING);
302 }
303
304 /* Now refile inode to proper lists */
305 list_for_each_entry_safe(jinode, next_i,
306 &commit_transaction->t_inode_list, i_list) {
307 list_del(&jinode->i_list);
308 if (jinode->i_next_transaction) {
309 jinode->i_transaction = jinode->i_next_transaction;
310 jinode->i_next_transaction = NULL;
311 list_add(&jinode->i_list,
312 &jinode->i_transaction->t_inode_list);
313 } else {
314 jinode->i_transaction = NULL;
315 }
316 }
317 spin_unlock(&journal->j_list_lock);
318
319 return ret;
320}
321
Girish Shilamkar818d2762008-01-28 23:58:27 -0500322static __u32 jbd2_checksum_data(__u32 crc32_sum, struct buffer_head *bh)
323{
324 struct page *page = bh->b_page;
325 char *addr;
326 __u32 checksum;
327
328 addr = kmap_atomic(page, KM_USER0);
329 checksum = crc32_be(crc32_sum,
330 (void *)(addr + offset_in_page(bh->b_data)), bh->b_size);
331 kunmap_atomic(addr, KM_USER0);
332
333 return checksum;
334}
335
336static void write_tag_block(int tag_bytes, journal_block_tag_t *tag,
Mingming Cao18eba7a2006-10-11 01:21:13 -0700337 unsigned long long block)
Zach Brownb517bea2006-10-11 01:21:08 -0700338{
339 tag->t_blocknr = cpu_to_be32(block & (u32)~0);
Mingming Caocd02ff02007-10-16 18:38:25 -0400340 if (tag_bytes > JBD2_TAG_SIZE32)
Zach Brownb517bea2006-10-11 01:21:08 -0700341 tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1);
342}
343
Dave Kleikamp470decc2006-10-11 01:20:57 -0700344/*
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700345 * jbd2_journal_commit_transaction
Dave Kleikamp470decc2006-10-11 01:20:57 -0700346 *
347 * The primary function for committing a transaction to the log. This
348 * function is called by the journal thread to begin a complete commit.
349 */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700350void jbd2_journal_commit_transaction(journal_t *journal)
Dave Kleikamp470decc2006-10-11 01:20:57 -0700351{
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500352 struct transaction_stats_s stats;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700353 transaction_t *commit_transaction;
354 struct journal_head *jh, *new_jh, *descriptor;
355 struct buffer_head **wbuf = journal->j_wbuf;
356 int bufs;
357 int flags;
358 int err;
Mingming Cao18eba7a2006-10-11 01:21:13 -0700359 unsigned long long blocknr;
Josef Bacike07f7182008-11-26 01:14:26 -0500360 ktime_t start_time;
361 u64 commit_time;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700362 char *tagp = NULL;
363 journal_header_t *header;
364 journal_block_tag_t *tag = NULL;
365 int space_left = 0;
366 int first_tag = 0;
367 int tag_flag;
Aneesh Kumar K.Vfb684072008-11-06 17:50:21 -0500368 int i, to_free = 0;
Zach Brownb517bea2006-10-11 01:21:08 -0700369 int tag_bytes = journal_tag_bytes(journal);
Girish Shilamkar818d2762008-01-28 23:58:27 -0500370 struct buffer_head *cbh = NULL; /* For transactional checksums */
371 __u32 crc32_sum = ~0;
Theodore Ts'o70585482009-03-25 23:35:46 -0400372 int write_op = WRITE;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700373
374 /*
375 * First job: lock down the current transaction and wait for
376 * all outstanding updates to complete.
377 */
378
379#ifdef COMMIT_STATS
380 spin_lock(&journal->j_list_lock);
381 summarise_journal_usage(journal);
382 spin_unlock(&journal->j_list_lock);
383#endif
384
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700385 /* Do we need to erase the effects of a prior jbd2_journal_flush? */
386 if (journal->j_flags & JBD2_FLUSHED) {
Dave Kleikamp470decc2006-10-11 01:20:57 -0700387 jbd_debug(3, "super block updated\n");
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700388 jbd2_journal_update_superblock(journal, 1);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700389 } else {
390 jbd_debug(3, "superblock not updated\n");
391 }
392
393 J_ASSERT(journal->j_running_transaction != NULL);
394 J_ASSERT(journal->j_committing_transaction == NULL);
395
396 commit_transaction = journal->j_running_transaction;
397 J_ASSERT(commit_transaction->t_state == T_RUNNING);
398
Theodore Ts'o879c5e62009-06-17 11:47:48 -0400399 trace_jbd2_start_commit(journal, commit_transaction);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700400 jbd_debug(1, "JBD: starting commit of transaction %d\n",
401 commit_transaction->t_tid);
402
403 spin_lock(&journal->j_state_lock);
404 commit_transaction->t_state = T_LOCKED;
405
Jens Axboe4194b1e2009-04-06 14:48:05 +0200406 /*
407 * Use plugged writes here, since we want to submit several before
408 * we unplug the device. We don't do explicit unplugging in here,
409 * instead we rely on sync_buffer() doing the unplug for us.
410 */
Theodore Ts'o70585482009-03-25 23:35:46 -0400411 if (commit_transaction->t_synchronous_commit)
Jens Axboe4194b1e2009-04-06 14:48:05 +0200412 write_op = WRITE_SYNC_PLUG;
Theodore Ts'o879c5e62009-06-17 11:47:48 -0400413 trace_jbd2_commit_locking(journal, commit_transaction);
Theodore Ts'obf699322009-09-30 00:32:06 -0400414 stats.run.rs_wait = commit_transaction->t_max_wait;
415 stats.run.rs_locked = jiffies;
416 stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start,
417 stats.run.rs_locked);
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500418
Dave Kleikamp470decc2006-10-11 01:20:57 -0700419 spin_lock(&commit_transaction->t_handle_lock);
420 while (commit_transaction->t_updates) {
421 DEFINE_WAIT(wait);
422
423 prepare_to_wait(&journal->j_wait_updates, &wait,
424 TASK_UNINTERRUPTIBLE);
425 if (commit_transaction->t_updates) {
426 spin_unlock(&commit_transaction->t_handle_lock);
427 spin_unlock(&journal->j_state_lock);
428 schedule();
429 spin_lock(&journal->j_state_lock);
430 spin_lock(&commit_transaction->t_handle_lock);
431 }
432 finish_wait(&journal->j_wait_updates, &wait);
433 }
434 spin_unlock(&commit_transaction->t_handle_lock);
435
436 J_ASSERT (commit_transaction->t_outstanding_credits <=
437 journal->j_max_transaction_buffers);
438
439 /*
440 * First thing we are allowed to do is to discard any remaining
441 * BJ_Reserved buffers. Note, it is _not_ permissible to assume
442 * that there are no such buffers: if a large filesystem
443 * operation like a truncate needs to split itself over multiple
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700444 * transactions, then it may try to do a jbd2_journal_restart() while
Dave Kleikamp470decc2006-10-11 01:20:57 -0700445 * there are still BJ_Reserved buffers outstanding. These must
446 * be released cleanly from the current transaction.
447 *
448 * In this case, the filesystem must still reserve write access
449 * again before modifying the buffer in the new transaction, but
450 * we do not require it to remember exactly which old buffers it
451 * has reserved. This is consistent with the existing behaviour
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700452 * that multiple jbd2_journal_get_write_access() calls to the same
Dave Kleikamp470decc2006-10-11 01:20:57 -0700453 * buffer are perfectly permissable.
454 */
455 while (commit_transaction->t_reserved_list) {
456 jh = commit_transaction->t_reserved_list;
457 JBUFFER_TRACE(jh, "reserved, unused: refile");
458 /*
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700459 * A jbd2_journal_get_undo_access()+jbd2_journal_release_buffer() may
Dave Kleikamp470decc2006-10-11 01:20:57 -0700460 * leave undo-committed data.
461 */
462 if (jh->b_committed_data) {
463 struct buffer_head *bh = jh2bh(jh);
464
465 jbd_lock_bh_state(bh);
Mingming Caoaf1e76d2007-10-16 18:38:25 -0400466 jbd2_free(jh->b_committed_data, bh->b_size);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700467 jh->b_committed_data = NULL;
468 jbd_unlock_bh_state(bh);
469 }
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700470 jbd2_journal_refile_buffer(journal, jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700471 }
472
473 /*
474 * Now try to drop any written-back buffers from the journal's
475 * checkpoint lists. We do this *before* commit because it potentially
476 * frees some memory
477 */
478 spin_lock(&journal->j_list_lock);
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700479 __jbd2_journal_clean_checkpoint_list(journal);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700480 spin_unlock(&journal->j_list_lock);
481
482 jbd_debug (3, "JBD: commit phase 1\n");
483
484 /*
485 * Switch to a new revoke table.
486 */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700487 jbd2_journal_switch_revoke_table(journal);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700488
Theodore Ts'o879c5e62009-06-17 11:47:48 -0400489 trace_jbd2_commit_flushing(journal, commit_transaction);
Theodore Ts'obf699322009-09-30 00:32:06 -0400490 stats.run.rs_flushing = jiffies;
491 stats.run.rs_locked = jbd2_time_diff(stats.run.rs_locked,
492 stats.run.rs_flushing);
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500493
Dave Kleikamp470decc2006-10-11 01:20:57 -0700494 commit_transaction->t_state = T_FLUSH;
495 journal->j_committing_transaction = commit_transaction;
496 journal->j_running_transaction = NULL;
Josef Bacike07f7182008-11-26 01:14:26 -0500497 start_time = ktime_get();
Dave Kleikamp470decc2006-10-11 01:20:57 -0700498 commit_transaction->t_log_start = journal->j_head;
499 wake_up(&journal->j_wait_transaction_locked);
500 spin_unlock(&journal->j_state_lock);
501
502 jbd_debug (3, "JBD: commit phase 2\n");
503
504 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700505 * Now start flushing things to disk, in the order they appear
506 * on the transaction lists. Data blocks go first.
507 */
Aneesh Kumar K.Vcd1aac32008-07-11 19:27:31 -0400508 err = journal_submit_data_buffers(journal, commit_transaction);
Jan Karac851ed52008-07-11 19:27:31 -0400509 if (err)
510 jbd2_journal_abort(journal, err);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700511
Theodore Ts'o67c457a2009-04-14 07:50:56 -0400512 jbd2_journal_write_revoke_records(journal, commit_transaction,
513 write_op);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700514
515 jbd_debug(3, "JBD: commit phase 2\n");
516
517 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700518 * Way to go: we have now written out all of the data for a
519 * transaction! Now comes the tricky part: we need to write out
520 * metadata. Loop over the transaction's entire buffer list:
521 */
Mingming Cao02c471c2008-05-15 14:46:17 -0400522 spin_lock(&journal->j_state_lock);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700523 commit_transaction->t_state = T_COMMIT;
Mingming Cao02c471c2008-05-15 14:46:17 -0400524 spin_unlock(&journal->j_state_lock);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700525
Theodore Ts'o879c5e62009-06-17 11:47:48 -0400526 trace_jbd2_commit_logging(journal, commit_transaction);
Theodore Ts'obf699322009-09-30 00:32:06 -0400527 stats.run.rs_logging = jiffies;
528 stats.run.rs_flushing = jbd2_time_diff(stats.run.rs_flushing,
529 stats.run.rs_logging);
530 stats.run.rs_blocks = commit_transaction->t_outstanding_credits;
531 stats.run.rs_blocks_logged = 0;
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500532
Josef Bacik1dfc3222008-04-17 10:38:59 -0400533 J_ASSERT(commit_transaction->t_nr_buffers <=
534 commit_transaction->t_outstanding_credits);
535
Jan Kara87c89c22008-07-11 19:27:31 -0400536 err = 0;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700537 descriptor = NULL;
538 bufs = 0;
539 while (commit_transaction->t_buffers) {
540
541 /* Find the next buffer to be journaled... */
542
543 jh = commit_transaction->t_buffers;
544
545 /* If we're in abort mode, we just un-journal the buffer and
Hidehiro Kawai7ad74452008-10-10 20:29:31 -0400546 release it. */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700547
548 if (is_journal_aborted(journal)) {
Hidehiro Kawai7ad74452008-10-10 20:29:31 -0400549 clear_buffer_jbddirty(jh2bh(jh));
Dave Kleikamp470decc2006-10-11 01:20:57 -0700550 JBUFFER_TRACE(jh, "journal is aborting: refile");
Joel Beckere06c8222008-09-11 15:35:47 -0700551 jbd2_buffer_abort_trigger(jh,
552 jh->b_frozen_data ?
553 jh->b_frozen_triggers :
554 jh->b_triggers);
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700555 jbd2_journal_refile_buffer(journal, jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700556 /* If that was the last one, we need to clean up
557 * any descriptor buffers which may have been
558 * already allocated, even if we are now
559 * aborting. */
560 if (!commit_transaction->t_buffers)
561 goto start_journal_io;
562 continue;
563 }
564
565 /* Make sure we have a descriptor block in which to
566 record the metadata buffer. */
567
568 if (!descriptor) {
569 struct buffer_head *bh;
570
571 J_ASSERT (bufs == 0);
572
573 jbd_debug(4, "JBD: get descriptor\n");
574
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700575 descriptor = jbd2_journal_get_descriptor_buffer(journal);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700576 if (!descriptor) {
Jan Karaa7fa2ba2007-10-16 18:38:25 -0400577 jbd2_journal_abort(journal, -EIO);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700578 continue;
579 }
580
581 bh = jh2bh(descriptor);
582 jbd_debug(4, "JBD: got buffer %llu (%p)\n",
583 (unsigned long long)bh->b_blocknr, bh->b_data);
584 header = (journal_header_t *)&bh->b_data[0];
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700585 header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER);
586 header->h_blocktype = cpu_to_be32(JBD2_DESCRIPTOR_BLOCK);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700587 header->h_sequence = cpu_to_be32(commit_transaction->t_tid);
588
589 tagp = &bh->b_data[sizeof(journal_header_t)];
590 space_left = bh->b_size - sizeof(journal_header_t);
591 first_tag = 1;
592 set_buffer_jwrite(bh);
593 set_buffer_dirty(bh);
594 wbuf[bufs++] = bh;
595
596 /* Record it so that we can wait for IO
597 completion later */
598 BUFFER_TRACE(bh, "ph3: file as descriptor");
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700599 jbd2_journal_file_buffer(descriptor, commit_transaction,
Dave Kleikamp470decc2006-10-11 01:20:57 -0700600 BJ_LogCtl);
601 }
602
603 /* Where is the buffer to be written? */
604
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700605 err = jbd2_journal_next_log_block(journal, &blocknr);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700606 /* If the block mapping failed, just abandon the buffer
607 and repeat this loop: we'll fall into the
608 refile-on-abort condition above. */
609 if (err) {
Jan Karaa7fa2ba2007-10-16 18:38:25 -0400610 jbd2_journal_abort(journal, err);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700611 continue;
612 }
613
614 /*
615 * start_this_handle() uses t_outstanding_credits to determine
616 * the free space in the log, but this counter is changed
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700617 * by jbd2_journal_next_log_block() also.
Dave Kleikamp470decc2006-10-11 01:20:57 -0700618 */
619 commit_transaction->t_outstanding_credits--;
620
621 /* Bump b_count to prevent truncate from stumbling over
622 the shadowed buffer! @@@ This can go if we ever get
623 rid of the BJ_IO/BJ_Shadow pairing of buffers. */
624 atomic_inc(&jh2bh(jh)->b_count);
625
626 /* Make a temporary IO buffer with which to write it out
627 (this will requeue both the metadata buffer and the
628 temporary IO buffer). new_bh goes on BJ_IO*/
629
630 set_bit(BH_JWrite, &jh2bh(jh)->b_state);
631 /*
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700632 * akpm: jbd2_journal_write_metadata_buffer() sets
Dave Kleikamp470decc2006-10-11 01:20:57 -0700633 * new_bh->b_transaction to commit_transaction.
634 * We need to clean this up before we release new_bh
635 * (which is of type BJ_IO)
636 */
637 JBUFFER_TRACE(jh, "ph3: write metadata");
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700638 flags = jbd2_journal_write_metadata_buffer(commit_transaction,
Dave Kleikamp470decc2006-10-11 01:20:57 -0700639 jh, &new_jh, blocknr);
Theodore Ts'oe6ec1162009-12-01 09:04:42 -0500640 if (flags < 0) {
641 jbd2_journal_abort(journal, flags);
642 continue;
643 }
Dave Kleikamp470decc2006-10-11 01:20:57 -0700644 set_bit(BH_JWrite, &jh2bh(new_jh)->b_state);
645 wbuf[bufs++] = jh2bh(new_jh);
646
647 /* Record the new block's tag in the current descriptor
648 buffer */
649
650 tag_flag = 0;
651 if (flags & 1)
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700652 tag_flag |= JBD2_FLAG_ESCAPE;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700653 if (!first_tag)
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700654 tag_flag |= JBD2_FLAG_SAME_UUID;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700655
656 tag = (journal_block_tag_t *) tagp;
Zach Brownb517bea2006-10-11 01:21:08 -0700657 write_tag_block(tag_bytes, tag, jh2bh(jh)->b_blocknr);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700658 tag->t_flags = cpu_to_be32(tag_flag);
Zach Brownb517bea2006-10-11 01:21:08 -0700659 tagp += tag_bytes;
660 space_left -= tag_bytes;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700661
662 if (first_tag) {
663 memcpy (tagp, journal->j_uuid, 16);
664 tagp += 16;
665 space_left -= 16;
666 first_tag = 0;
667 }
668
669 /* If there's no more to do, or if the descriptor is full,
670 let the IO rip! */
671
672 if (bufs == journal->j_wbufsize ||
673 commit_transaction->t_buffers == NULL ||
Zach Brownb517bea2006-10-11 01:21:08 -0700674 space_left < tag_bytes + 16) {
Dave Kleikamp470decc2006-10-11 01:20:57 -0700675
676 jbd_debug(4, "JBD: Submit %d IOs\n", bufs);
677
678 /* Write an end-of-descriptor marker before
679 submitting the IOs. "tag" still points to
680 the last tag we set up. */
681
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700682 tag->t_flags |= cpu_to_be32(JBD2_FLAG_LAST_TAG);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700683
684start_journal_io:
685 for (i = 0; i < bufs; i++) {
686 struct buffer_head *bh = wbuf[i];
Girish Shilamkar818d2762008-01-28 23:58:27 -0500687 /*
688 * Compute checksum.
689 */
690 if (JBD2_HAS_COMPAT_FEATURE(journal,
691 JBD2_FEATURE_COMPAT_CHECKSUM)) {
692 crc32_sum =
693 jbd2_checksum_data(crc32_sum, bh);
694 }
695
Dave Kleikamp470decc2006-10-11 01:20:57 -0700696 lock_buffer(bh);
697 clear_buffer_dirty(bh);
698 set_buffer_uptodate(bh);
699 bh->b_end_io = journal_end_buffer_io_sync;
Theodore Ts'o70585482009-03-25 23:35:46 -0400700 submit_bh(write_op, bh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700701 }
702 cond_resched();
Theodore Ts'obf699322009-09-30 00:32:06 -0400703 stats.run.rs_blocks_logged += bufs;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700704
705 /* Force a new descriptor to be generated next
706 time round the loop. */
707 descriptor = NULL;
708 bufs = 0;
709 }
710 }
711
Theodore Ts'occ3e1be2009-12-23 06:52:08 -0500712 /*
713 * If the journal is not located on the file system device,
714 * then we must flush the file system device before we issue
715 * the commit record
716 */
717 if (commit_transaction->t_flushed_data_blocks &&
718 (journal->j_fs_dev != journal->j_dev) &&
719 (journal->j_flags & JBD2_BARRIER))
Dmitry Monakhovfbd9b092010-04-28 17:55:06 +0400720 blkdev_issue_flush(journal->j_fs_dev, GFP_KERNEL, NULL,
721 BLKDEV_IFL_WAIT);
Girish Shilamkar818d2762008-01-28 23:58:27 -0500722
Theodore Ts'occ3e1be2009-12-23 06:52:08 -0500723 /* Done it all: now write the commit record asynchronously. */
Girish Shilamkar818d2762008-01-28 23:58:27 -0500724 if (JBD2_HAS_INCOMPAT_FEATURE(journal,
Theodore Ts'o0e3d2a62009-09-11 09:30:12 -0400725 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) {
Girish Shilamkar818d2762008-01-28 23:58:27 -0500726 err = journal_submit_commit_record(journal, commit_transaction,
727 &cbh, crc32_sum);
728 if (err)
729 __jbd2_journal_abort_hard(journal);
Theodore Ts'o0e3d2a62009-09-11 09:30:12 -0400730 if (journal->j_flags & JBD2_BARRIER)
Dmitry Monakhovfbd9b092010-04-28 17:55:06 +0400731 blkdev_issue_flush(journal->j_dev, GFP_KERNEL, NULL,
732 BLKDEV_IFL_WAIT);
Girish Shilamkar818d2762008-01-28 23:58:27 -0500733 }
734
Jan Karac851ed52008-07-11 19:27:31 -0400735 err = journal_finish_inode_data_buffers(journal, commit_transaction);
Hidehiro Kawaie9e34f42008-07-31 22:26:04 -0400736 if (err) {
Hidehiro Kawaie9e34f42008-07-31 22:26:04 -0400737 printk(KERN_WARNING
738 "JBD2: Detected IO errors while flushing file data "
Theodore Ts'o05496762008-09-16 14:36:17 -0400739 "on %s\n", journal->j_devname);
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400740 if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR)
741 jbd2_journal_abort(journal, err);
Hidehiro Kawaie9e34f42008-07-31 22:26:04 -0400742 err = 0;
743 }
Jan Karac851ed52008-07-11 19:27:31 -0400744
Dave Kleikamp470decc2006-10-11 01:20:57 -0700745 /* Lo and behold: we have just managed to send a transaction to
746 the log. Before we can commit it, wait for the IO so far to
747 complete. Control buffers being written are on the
748 transaction's t_log_list queue, and metadata buffers are on
749 the t_iobuf_list queue.
750
751 Wait for the buffers in reverse order. That way we are
752 less likely to be woken up until all IOs have completed, and
753 so we incur less scheduling load.
754 */
755
Jan Kara87c89c22008-07-11 19:27:31 -0400756 jbd_debug(3, "JBD: commit phase 3\n");
Dave Kleikamp470decc2006-10-11 01:20:57 -0700757
758 /*
759 * akpm: these are BJ_IO, and j_list_lock is not needed.
760 * See __journal_try_to_free_buffer.
761 */
762wait_for_iobuf:
763 while (commit_transaction->t_iobuf_list != NULL) {
764 struct buffer_head *bh;
765
766 jh = commit_transaction->t_iobuf_list->b_tprev;
767 bh = jh2bh(jh);
768 if (buffer_locked(bh)) {
769 wait_on_buffer(bh);
770 goto wait_for_iobuf;
771 }
772 if (cond_resched())
773 goto wait_for_iobuf;
774
775 if (unlikely(!buffer_uptodate(bh)))
776 err = -EIO;
777
778 clear_buffer_jwrite(bh);
779
780 JBUFFER_TRACE(jh, "ph4: unfile after journal write");
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700781 jbd2_journal_unfile_buffer(journal, jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700782
783 /*
784 * ->t_iobuf_list should contain only dummy buffer_heads
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700785 * which were created by jbd2_journal_write_metadata_buffer().
Dave Kleikamp470decc2006-10-11 01:20:57 -0700786 */
787 BUFFER_TRACE(bh, "dumping temporary bh");
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700788 jbd2_journal_put_journal_head(jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700789 __brelse(bh);
790 J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0);
791 free_buffer_head(bh);
792
793 /* We also have to unlock and free the corresponding
794 shadowed buffer */
795 jh = commit_transaction->t_shadow_list->b_tprev;
796 bh = jh2bh(jh);
797 clear_bit(BH_JWrite, &bh->b_state);
798 J_ASSERT_BH(bh, buffer_jbddirty(bh));
799
800 /* The metadata is now released for reuse, but we need
801 to remember it against this transaction so that when
802 we finally commit, we can do any checkpointing
803 required. */
804 JBUFFER_TRACE(jh, "file as BJ_Forget");
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700805 jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700806 /* Wake up any transactions which were waiting for this
807 IO to complete */
808 wake_up_bit(&bh->b_state, BH_Unshadow);
809 JBUFFER_TRACE(jh, "brelse shadowed buffer");
810 __brelse(bh);
811 }
812
813 J_ASSERT (commit_transaction->t_shadow_list == NULL);
814
Jan Kara87c89c22008-07-11 19:27:31 -0400815 jbd_debug(3, "JBD: commit phase 4\n");
Dave Kleikamp470decc2006-10-11 01:20:57 -0700816
817 /* Here we wait for the revoke record and descriptor record buffers */
818 wait_for_ctlbuf:
819 while (commit_transaction->t_log_list != NULL) {
820 struct buffer_head *bh;
821
822 jh = commit_transaction->t_log_list->b_tprev;
823 bh = jh2bh(jh);
824 if (buffer_locked(bh)) {
825 wait_on_buffer(bh);
826 goto wait_for_ctlbuf;
827 }
828 if (cond_resched())
829 goto wait_for_ctlbuf;
830
831 if (unlikely(!buffer_uptodate(bh)))
832 err = -EIO;
833
834 BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile");
835 clear_buffer_jwrite(bh);
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700836 jbd2_journal_unfile_buffer(journal, jh);
837 jbd2_journal_put_journal_head(jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700838 __brelse(bh); /* One for getblk */
839 /* AKPM: bforget here */
840 }
841
Hidehiro Kawai77e841d2008-10-12 16:39:16 -0400842 if (err)
843 jbd2_journal_abort(journal, err);
844
Jan Kara87c89c22008-07-11 19:27:31 -0400845 jbd_debug(3, "JBD: commit phase 5\n");
Dave Kleikamp470decc2006-10-11 01:20:57 -0700846
Girish Shilamkar818d2762008-01-28 23:58:27 -0500847 if (!JBD2_HAS_INCOMPAT_FEATURE(journal,
Theodore Ts'o0e3d2a62009-09-11 09:30:12 -0400848 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) {
Girish Shilamkar818d2762008-01-28 23:58:27 -0500849 err = journal_submit_commit_record(journal, commit_transaction,
850 &cbh, crc32_sum);
851 if (err)
852 __jbd2_journal_abort_hard(journal);
853 }
Mingming Caob048d842008-02-05 08:52:45 -0500854 if (!err && !is_journal_aborted(journal))
Theodore Ts'ofd984962009-01-05 21:34:13 -0500855 err = journal_wait_on_commit_record(journal, cbh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700856
857 if (err)
Jan Karaa7fa2ba2007-10-16 18:38:25 -0400858 jbd2_journal_abort(journal, err);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700859
860 /* End of a transaction! Finally, we can do checkpoint
861 processing: any buffers committed as a result of this
862 transaction can be removed from any checkpoint list it was on
863 before. */
864
Jan Kara87c89c22008-07-11 19:27:31 -0400865 jbd_debug(3, "JBD: commit phase 6\n");
Dave Kleikamp470decc2006-10-11 01:20:57 -0700866
Jan Karac851ed52008-07-11 19:27:31 -0400867 J_ASSERT(list_empty(&commit_transaction->t_inode_list));
Dave Kleikamp470decc2006-10-11 01:20:57 -0700868 J_ASSERT(commit_transaction->t_buffers == NULL);
869 J_ASSERT(commit_transaction->t_checkpoint_list == NULL);
870 J_ASSERT(commit_transaction->t_iobuf_list == NULL);
871 J_ASSERT(commit_transaction->t_shadow_list == NULL);
872 J_ASSERT(commit_transaction->t_log_list == NULL);
873
874restart_loop:
875 /*
876 * As there are other places (journal_unmap_buffer()) adding buffers
877 * to this list we have to be careful and hold the j_list_lock.
878 */
879 spin_lock(&journal->j_list_lock);
880 while (commit_transaction->t_forget) {
881 transaction_t *cp_transaction;
882 struct buffer_head *bh;
883
884 jh = commit_transaction->t_forget;
885 spin_unlock(&journal->j_list_lock);
886 bh = jh2bh(jh);
887 jbd_lock_bh_state(bh);
dingdinghua23e2af32010-02-24 12:11:20 -0500888 J_ASSERT_JH(jh, jh->b_transaction == commit_transaction);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700889
890 /*
891 * If there is undo-protected committed data against
892 * this buffer, then we can remove it now. If it is a
893 * buffer needing such protection, the old frozen_data
894 * field now points to a committed version of the
895 * buffer, so rotate that field to the new committed
896 * data.
897 *
898 * Otherwise, we can just throw away the frozen data now.
Joel Beckere06c8222008-09-11 15:35:47 -0700899 *
900 * We also know that the frozen data has already fired
901 * its triggers if they exist, so we can clear that too.
Dave Kleikamp470decc2006-10-11 01:20:57 -0700902 */
903 if (jh->b_committed_data) {
Mingming Caoaf1e76d2007-10-16 18:38:25 -0400904 jbd2_free(jh->b_committed_data, bh->b_size);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700905 jh->b_committed_data = NULL;
906 if (jh->b_frozen_data) {
907 jh->b_committed_data = jh->b_frozen_data;
908 jh->b_frozen_data = NULL;
Joel Beckere06c8222008-09-11 15:35:47 -0700909 jh->b_frozen_triggers = NULL;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700910 }
911 } else if (jh->b_frozen_data) {
Mingming Caoaf1e76d2007-10-16 18:38:25 -0400912 jbd2_free(jh->b_frozen_data, bh->b_size);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700913 jh->b_frozen_data = NULL;
Joel Beckere06c8222008-09-11 15:35:47 -0700914 jh->b_frozen_triggers = NULL;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700915 }
916
917 spin_lock(&journal->j_list_lock);
918 cp_transaction = jh->b_cp_transaction;
919 if (cp_transaction) {
920 JBUFFER_TRACE(jh, "remove from old cp transaction");
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500921 cp_transaction->t_chp_stats.cs_dropped++;
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700922 __jbd2_journal_remove_checkpoint(jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700923 }
924
925 /* Only re-checkpoint the buffer_head if it is marked
926 * dirty. If the buffer was added to the BJ_Forget list
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700927 * by jbd2_journal_forget, it may no longer be dirty and
Dave Kleikamp470decc2006-10-11 01:20:57 -0700928 * there's no point in keeping a checkpoint record for
929 * it. */
930
931 /* A buffer which has been freed while still being
932 * journaled by a previous transaction may end up still
933 * being dirty here, but we want to avoid writing back
dingdinghuaba869022010-02-15 16:35:42 -0500934 * that buffer in the future after the "add to orphan"
935 * operation been committed, That's not only a performance
936 * gain, it also stops aliasing problems if the buffer is
937 * left behind for writeback and gets reallocated for another
Dave Kleikamp470decc2006-10-11 01:20:57 -0700938 * use in a different page. */
dingdinghuaba869022010-02-15 16:35:42 -0500939 if (buffer_freed(bh) && !jh->b_next_transaction) {
Dave Kleikamp470decc2006-10-11 01:20:57 -0700940 clear_buffer_freed(bh);
941 clear_buffer_jbddirty(bh);
942 }
943
944 if (buffer_jbddirty(bh)) {
945 JBUFFER_TRACE(jh, "add to new checkpointing trans");
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700946 __jbd2_journal_insert_checkpoint(jh, commit_transaction);
Hidehiro Kawai7ad74452008-10-10 20:29:31 -0400947 if (is_journal_aborted(journal))
948 clear_buffer_jbddirty(bh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700949 JBUFFER_TRACE(jh, "refile for checkpoint writeback");
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700950 __jbd2_journal_refile_buffer(jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700951 jbd_unlock_bh_state(bh);
952 } else {
953 J_ASSERT_BH(bh, !buffer_dirty(bh));
954 /* The buffer on BJ_Forget list and not jbddirty means
955 * it has been freed by this transaction and hence it
956 * could not have been reallocated until this
957 * transaction has committed. *BUT* it could be
958 * reallocated once we have written all the data to
959 * disk and before we process the buffer on BJ_Forget
960 * list. */
961 JBUFFER_TRACE(jh, "refile or unfile freed buffer");
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700962 __jbd2_journal_refile_buffer(jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700963 if (!jh->b_transaction) {
964 jbd_unlock_bh_state(bh);
965 /* needs a brelse */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700966 jbd2_journal_remove_journal_head(bh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700967 release_buffer_page(bh);
968 } else
969 jbd_unlock_bh_state(bh);
970 }
971 cond_resched_lock(&journal->j_list_lock);
972 }
973 spin_unlock(&journal->j_list_lock);
974 /*
Jan Karaf5a7a6b2008-01-28 23:58:27 -0500975 * This is a bit sleazy. We use j_list_lock to protect transition
976 * of a transaction into T_FINISHED state and calling
977 * __jbd2_journal_drop_transaction(). Otherwise we could race with
978 * other checkpointing code processing the transaction...
Dave Kleikamp470decc2006-10-11 01:20:57 -0700979 */
980 spin_lock(&journal->j_state_lock);
981 spin_lock(&journal->j_list_lock);
982 /*
983 * Now recheck if some buffers did not get attached to the transaction
984 * while the lock was dropped...
985 */
986 if (commit_transaction->t_forget) {
987 spin_unlock(&journal->j_list_lock);
988 spin_unlock(&journal->j_state_lock);
989 goto restart_loop;
990 }
991
992 /* Done with this transaction! */
993
Jan Kara87c89c22008-07-11 19:27:31 -0400994 jbd_debug(3, "JBD: commit phase 7\n");
Dave Kleikamp470decc2006-10-11 01:20:57 -0700995
996 J_ASSERT(commit_transaction->t_state == T_COMMIT);
997
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500998 commit_transaction->t_start = jiffies;
Theodore Ts'obf699322009-09-30 00:32:06 -0400999 stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging,
1000 commit_transaction->t_start);
Johann Lombardi8e85fb32008-01-28 23:58:27 -05001001
1002 /*
Theodore Ts'obf699322009-09-30 00:32:06 -04001003 * File the transaction statistics
Johann Lombardi8e85fb32008-01-28 23:58:27 -05001004 */
Johann Lombardi8e85fb32008-01-28 23:58:27 -05001005 stats.ts_tid = commit_transaction->t_tid;
Theodore Ts'obf699322009-09-30 00:32:06 -04001006 stats.run.rs_handle_count = commit_transaction->t_handle_count;
1007 trace_jbd2_run_stats(journal->j_fs_dev->bd_dev,
1008 commit_transaction->t_tid, &stats.run);
Johann Lombardi8e85fb32008-01-28 23:58:27 -05001009
1010 /*
1011 * Calculate overall stats
1012 */
Theodore Ts'obf699322009-09-30 00:32:06 -04001013 spin_lock(&journal->j_history_lock);
Johann Lombardi8e85fb32008-01-28 23:58:27 -05001014 journal->j_stats.ts_tid++;
Theodore Ts'obf699322009-09-30 00:32:06 -04001015 journal->j_stats.run.rs_wait += stats.run.rs_wait;
1016 journal->j_stats.run.rs_running += stats.run.rs_running;
1017 journal->j_stats.run.rs_locked += stats.run.rs_locked;
1018 journal->j_stats.run.rs_flushing += stats.run.rs_flushing;
1019 journal->j_stats.run.rs_logging += stats.run.rs_logging;
1020 journal->j_stats.run.rs_handle_count += stats.run.rs_handle_count;
1021 journal->j_stats.run.rs_blocks += stats.run.rs_blocks;
1022 journal->j_stats.run.rs_blocks_logged += stats.run.rs_blocks_logged;
Johann Lombardi8e85fb32008-01-28 23:58:27 -05001023 spin_unlock(&journal->j_history_lock);
1024
Dave Kleikamp470decc2006-10-11 01:20:57 -07001025 commit_transaction->t_state = T_FINISHED;
1026 J_ASSERT(commit_transaction == journal->j_committing_transaction);
1027 journal->j_commit_sequence = commit_transaction->t_tid;
1028 journal->j_committing_transaction = NULL;
Josef Bacike07f7182008-11-26 01:14:26 -05001029 commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time));
Dave Kleikamp470decc2006-10-11 01:20:57 -07001030
Josef Bacike07f7182008-11-26 01:14:26 -05001031 /*
1032 * weight the commit time higher than the average time so we don't
1033 * react too strongly to vast changes in the commit time
1034 */
1035 if (likely(journal->j_average_commit_time))
1036 journal->j_average_commit_time = (commit_time +
1037 journal->j_average_commit_time*3) / 4;
1038 else
1039 journal->j_average_commit_time = commit_time;
Dave Kleikamp470decc2006-10-11 01:20:57 -07001040 spin_unlock(&journal->j_state_lock);
Theodore Ts'o6c20ec82008-10-28 21:08:20 -04001041
Jan Karaf89b7792007-07-15 23:37:20 -07001042 if (commit_transaction->t_checkpoint_list == NULL &&
1043 commit_transaction->t_checkpoint_io_list == NULL) {
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001044 __jbd2_journal_drop_transaction(journal, commit_transaction);
Aneesh Kumar K.Vfb684072008-11-06 17:50:21 -05001045 to_free = 1;
Dave Kleikamp470decc2006-10-11 01:20:57 -07001046 } else {
1047 if (journal->j_checkpoint_transactions == NULL) {
1048 journal->j_checkpoint_transactions = commit_transaction;
1049 commit_transaction->t_cpnext = commit_transaction;
1050 commit_transaction->t_cpprev = commit_transaction;
1051 } else {
1052 commit_transaction->t_cpnext =
1053 journal->j_checkpoint_transactions;
1054 commit_transaction->t_cpprev =
1055 commit_transaction->t_cpnext->t_cpprev;
1056 commit_transaction->t_cpnext->t_cpprev =
1057 commit_transaction;
1058 commit_transaction->t_cpprev->t_cpnext =
1059 commit_transaction;
1060 }
1061 }
1062 spin_unlock(&journal->j_list_lock);
1063
Aneesh Kumar K.Vfb684072008-11-06 17:50:21 -05001064 if (journal->j_commit_callback)
1065 journal->j_commit_callback(journal, commit_transaction);
1066
Theodore Ts'o879c5e62009-06-17 11:47:48 -04001067 trace_jbd2_end_commit(journal, commit_transaction);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001068 jbd_debug(1, "JBD: commit %d complete, head %d\n",
1069 journal->j_commit_sequence, journal->j_tail_sequence);
Aneesh Kumar K.Vfb684072008-11-06 17:50:21 -05001070 if (to_free)
1071 kfree(commit_transaction);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001072
1073 wake_up(&journal->j_wait_done_commit);
1074}