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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))
720 blkdev_issue_flush(journal->j_fs_dev, NULL);
Girish Shilamkar818d2762008-01-28 23:58:27 -0500721
Theodore Ts'occ3e1be2009-12-23 06:52:08 -0500722 /* Done it all: now write the commit record asynchronously. */
Girish Shilamkar818d2762008-01-28 23:58:27 -0500723 if (JBD2_HAS_INCOMPAT_FEATURE(journal,
Theodore Ts'o0e3d2a62009-09-11 09:30:12 -0400724 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) {
Girish Shilamkar818d2762008-01-28 23:58:27 -0500725 err = journal_submit_commit_record(journal, commit_transaction,
726 &cbh, crc32_sum);
727 if (err)
728 __jbd2_journal_abort_hard(journal);
Theodore Ts'o0e3d2a62009-09-11 09:30:12 -0400729 if (journal->j_flags & JBD2_BARRIER)
730 blkdev_issue_flush(journal->j_dev, NULL);
Girish Shilamkar818d2762008-01-28 23:58:27 -0500731 }
732
Jan Karac851ed52008-07-11 19:27:31 -0400733 err = journal_finish_inode_data_buffers(journal, commit_transaction);
Hidehiro Kawaie9e34f42008-07-31 22:26:04 -0400734 if (err) {
Hidehiro Kawaie9e34f42008-07-31 22:26:04 -0400735 printk(KERN_WARNING
736 "JBD2: Detected IO errors while flushing file data "
Theodore Ts'o05496762008-09-16 14:36:17 -0400737 "on %s\n", journal->j_devname);
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400738 if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR)
739 jbd2_journal_abort(journal, err);
Hidehiro Kawaie9e34f42008-07-31 22:26:04 -0400740 err = 0;
741 }
Jan Karac851ed52008-07-11 19:27:31 -0400742
Dave Kleikamp470decc2006-10-11 01:20:57 -0700743 /* Lo and behold: we have just managed to send a transaction to
744 the log. Before we can commit it, wait for the IO so far to
745 complete. Control buffers being written are on the
746 transaction's t_log_list queue, and metadata buffers are on
747 the t_iobuf_list queue.
748
749 Wait for the buffers in reverse order. That way we are
750 less likely to be woken up until all IOs have completed, and
751 so we incur less scheduling load.
752 */
753
Jan Kara87c89c22008-07-11 19:27:31 -0400754 jbd_debug(3, "JBD: commit phase 3\n");
Dave Kleikamp470decc2006-10-11 01:20:57 -0700755
756 /*
757 * akpm: these are BJ_IO, and j_list_lock is not needed.
758 * See __journal_try_to_free_buffer.
759 */
760wait_for_iobuf:
761 while (commit_transaction->t_iobuf_list != NULL) {
762 struct buffer_head *bh;
763
764 jh = commit_transaction->t_iobuf_list->b_tprev;
765 bh = jh2bh(jh);
766 if (buffer_locked(bh)) {
767 wait_on_buffer(bh);
768 goto wait_for_iobuf;
769 }
770 if (cond_resched())
771 goto wait_for_iobuf;
772
773 if (unlikely(!buffer_uptodate(bh)))
774 err = -EIO;
775
776 clear_buffer_jwrite(bh);
777
778 JBUFFER_TRACE(jh, "ph4: unfile after journal write");
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700779 jbd2_journal_unfile_buffer(journal, jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700780
781 /*
782 * ->t_iobuf_list should contain only dummy buffer_heads
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700783 * which were created by jbd2_journal_write_metadata_buffer().
Dave Kleikamp470decc2006-10-11 01:20:57 -0700784 */
785 BUFFER_TRACE(bh, "dumping temporary bh");
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700786 jbd2_journal_put_journal_head(jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700787 __brelse(bh);
788 J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0);
789 free_buffer_head(bh);
790
791 /* We also have to unlock and free the corresponding
792 shadowed buffer */
793 jh = commit_transaction->t_shadow_list->b_tprev;
794 bh = jh2bh(jh);
795 clear_bit(BH_JWrite, &bh->b_state);
796 J_ASSERT_BH(bh, buffer_jbddirty(bh));
797
798 /* The metadata is now released for reuse, but we need
799 to remember it against this transaction so that when
800 we finally commit, we can do any checkpointing
801 required. */
802 JBUFFER_TRACE(jh, "file as BJ_Forget");
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700803 jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700804 /* Wake up any transactions which were waiting for this
805 IO to complete */
806 wake_up_bit(&bh->b_state, BH_Unshadow);
807 JBUFFER_TRACE(jh, "brelse shadowed buffer");
808 __brelse(bh);
809 }
810
811 J_ASSERT (commit_transaction->t_shadow_list == NULL);
812
Jan Kara87c89c22008-07-11 19:27:31 -0400813 jbd_debug(3, "JBD: commit phase 4\n");
Dave Kleikamp470decc2006-10-11 01:20:57 -0700814
815 /* Here we wait for the revoke record and descriptor record buffers */
816 wait_for_ctlbuf:
817 while (commit_transaction->t_log_list != NULL) {
818 struct buffer_head *bh;
819
820 jh = commit_transaction->t_log_list->b_tprev;
821 bh = jh2bh(jh);
822 if (buffer_locked(bh)) {
823 wait_on_buffer(bh);
824 goto wait_for_ctlbuf;
825 }
826 if (cond_resched())
827 goto wait_for_ctlbuf;
828
829 if (unlikely(!buffer_uptodate(bh)))
830 err = -EIO;
831
832 BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile");
833 clear_buffer_jwrite(bh);
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700834 jbd2_journal_unfile_buffer(journal, jh);
835 jbd2_journal_put_journal_head(jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700836 __brelse(bh); /* One for getblk */
837 /* AKPM: bforget here */
838 }
839
Hidehiro Kawai77e841d2008-10-12 16:39:16 -0400840 if (err)
841 jbd2_journal_abort(journal, err);
842
Jan Kara87c89c22008-07-11 19:27:31 -0400843 jbd_debug(3, "JBD: commit phase 5\n");
Dave Kleikamp470decc2006-10-11 01:20:57 -0700844
Girish Shilamkar818d2762008-01-28 23:58:27 -0500845 if (!JBD2_HAS_INCOMPAT_FEATURE(journal,
Theodore Ts'o0e3d2a62009-09-11 09:30:12 -0400846 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) {
Girish Shilamkar818d2762008-01-28 23:58:27 -0500847 err = journal_submit_commit_record(journal, commit_transaction,
848 &cbh, crc32_sum);
849 if (err)
850 __jbd2_journal_abort_hard(journal);
851 }
Mingming Caob048d842008-02-05 08:52:45 -0500852 if (!err && !is_journal_aborted(journal))
Theodore Ts'ofd984962009-01-05 21:34:13 -0500853 err = journal_wait_on_commit_record(journal, cbh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700854
855 if (err)
Jan Karaa7fa2ba2007-10-16 18:38:25 -0400856 jbd2_journal_abort(journal, err);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700857
858 /* End of a transaction! Finally, we can do checkpoint
859 processing: any buffers committed as a result of this
860 transaction can be removed from any checkpoint list it was on
861 before. */
862
Jan Kara87c89c22008-07-11 19:27:31 -0400863 jbd_debug(3, "JBD: commit phase 6\n");
Dave Kleikamp470decc2006-10-11 01:20:57 -0700864
Jan Karac851ed52008-07-11 19:27:31 -0400865 J_ASSERT(list_empty(&commit_transaction->t_inode_list));
Dave Kleikamp470decc2006-10-11 01:20:57 -0700866 J_ASSERT(commit_transaction->t_buffers == NULL);
867 J_ASSERT(commit_transaction->t_checkpoint_list == NULL);
868 J_ASSERT(commit_transaction->t_iobuf_list == NULL);
869 J_ASSERT(commit_transaction->t_shadow_list == NULL);
870 J_ASSERT(commit_transaction->t_log_list == NULL);
871
872restart_loop:
873 /*
874 * As there are other places (journal_unmap_buffer()) adding buffers
875 * to this list we have to be careful and hold the j_list_lock.
876 */
877 spin_lock(&journal->j_list_lock);
878 while (commit_transaction->t_forget) {
879 transaction_t *cp_transaction;
880 struct buffer_head *bh;
881
882 jh = commit_transaction->t_forget;
883 spin_unlock(&journal->j_list_lock);
884 bh = jh2bh(jh);
885 jbd_lock_bh_state(bh);
886 J_ASSERT_JH(jh, jh->b_transaction == commit_transaction ||
887 jh->b_transaction == journal->j_running_transaction);
888
889 /*
890 * If there is undo-protected committed data against
891 * this buffer, then we can remove it now. If it is a
892 * buffer needing such protection, the old frozen_data
893 * field now points to a committed version of the
894 * buffer, so rotate that field to the new committed
895 * data.
896 *
897 * Otherwise, we can just throw away the frozen data now.
Joel Beckere06c8222008-09-11 15:35:47 -0700898 *
899 * We also know that the frozen data has already fired
900 * its triggers if they exist, so we can clear that too.
Dave Kleikamp470decc2006-10-11 01:20:57 -0700901 */
902 if (jh->b_committed_data) {
Mingming Caoaf1e76d2007-10-16 18:38:25 -0400903 jbd2_free(jh->b_committed_data, bh->b_size);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700904 jh->b_committed_data = NULL;
905 if (jh->b_frozen_data) {
906 jh->b_committed_data = jh->b_frozen_data;
907 jh->b_frozen_data = NULL;
Joel Beckere06c8222008-09-11 15:35:47 -0700908 jh->b_frozen_triggers = NULL;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700909 }
910 } else if (jh->b_frozen_data) {
Mingming Caoaf1e76d2007-10-16 18:38:25 -0400911 jbd2_free(jh->b_frozen_data, bh->b_size);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700912 jh->b_frozen_data = NULL;
Joel Beckere06c8222008-09-11 15:35:47 -0700913 jh->b_frozen_triggers = NULL;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700914 }
915
916 spin_lock(&journal->j_list_lock);
917 cp_transaction = jh->b_cp_transaction;
918 if (cp_transaction) {
919 JBUFFER_TRACE(jh, "remove from old cp transaction");
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500920 cp_transaction->t_chp_stats.cs_dropped++;
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700921 __jbd2_journal_remove_checkpoint(jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700922 }
923
924 /* Only re-checkpoint the buffer_head if it is marked
925 * dirty. If the buffer was added to the BJ_Forget list
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700926 * by jbd2_journal_forget, it may no longer be dirty and
Dave Kleikamp470decc2006-10-11 01:20:57 -0700927 * there's no point in keeping a checkpoint record for
928 * it. */
929
930 /* A buffer which has been freed while still being
931 * journaled by a previous transaction may end up still
932 * being dirty here, but we want to avoid writing back
933 * that buffer in the future now that the last use has
934 * been committed. That's not only a performance gain,
935 * it also stops aliasing problems if the buffer is left
936 * behind for writeback and gets reallocated for another
937 * use in a different page. */
938 if (buffer_freed(bh)) {
939 clear_buffer_freed(bh);
940 clear_buffer_jbddirty(bh);
941 }
942
943 if (buffer_jbddirty(bh)) {
944 JBUFFER_TRACE(jh, "add to new checkpointing trans");
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700945 __jbd2_journal_insert_checkpoint(jh, commit_transaction);
Hidehiro Kawai7ad74452008-10-10 20:29:31 -0400946 if (is_journal_aborted(journal))
947 clear_buffer_jbddirty(bh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700948 JBUFFER_TRACE(jh, "refile for checkpoint writeback");
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700949 __jbd2_journal_refile_buffer(jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700950 jbd_unlock_bh_state(bh);
951 } else {
952 J_ASSERT_BH(bh, !buffer_dirty(bh));
953 /* The buffer on BJ_Forget list and not jbddirty means
954 * it has been freed by this transaction and hence it
955 * could not have been reallocated until this
956 * transaction has committed. *BUT* it could be
957 * reallocated once we have written all the data to
958 * disk and before we process the buffer on BJ_Forget
959 * list. */
960 JBUFFER_TRACE(jh, "refile or unfile freed buffer");
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700961 __jbd2_journal_refile_buffer(jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700962 if (!jh->b_transaction) {
963 jbd_unlock_bh_state(bh);
964 /* needs a brelse */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700965 jbd2_journal_remove_journal_head(bh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700966 release_buffer_page(bh);
967 } else
968 jbd_unlock_bh_state(bh);
969 }
970 cond_resched_lock(&journal->j_list_lock);
971 }
972 spin_unlock(&journal->j_list_lock);
973 /*
Jan Karaf5a7a6b2008-01-28 23:58:27 -0500974 * This is a bit sleazy. We use j_list_lock to protect transition
975 * of a transaction into T_FINISHED state and calling
976 * __jbd2_journal_drop_transaction(). Otherwise we could race with
977 * other checkpointing code processing the transaction...
Dave Kleikamp470decc2006-10-11 01:20:57 -0700978 */
979 spin_lock(&journal->j_state_lock);
980 spin_lock(&journal->j_list_lock);
981 /*
982 * Now recheck if some buffers did not get attached to the transaction
983 * while the lock was dropped...
984 */
985 if (commit_transaction->t_forget) {
986 spin_unlock(&journal->j_list_lock);
987 spin_unlock(&journal->j_state_lock);
988 goto restart_loop;
989 }
990
991 /* Done with this transaction! */
992
Jan Kara87c89c22008-07-11 19:27:31 -0400993 jbd_debug(3, "JBD: commit phase 7\n");
Dave Kleikamp470decc2006-10-11 01:20:57 -0700994
995 J_ASSERT(commit_transaction->t_state == T_COMMIT);
996
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500997 commit_transaction->t_start = jiffies;
Theodore Ts'obf699322009-09-30 00:32:06 -0400998 stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging,
999 commit_transaction->t_start);
Johann Lombardi8e85fb32008-01-28 23:58:27 -05001000
1001 /*
Theodore Ts'obf699322009-09-30 00:32:06 -04001002 * File the transaction statistics
Johann Lombardi8e85fb32008-01-28 23:58:27 -05001003 */
Johann Lombardi8e85fb32008-01-28 23:58:27 -05001004 stats.ts_tid = commit_transaction->t_tid;
Theodore Ts'obf699322009-09-30 00:32:06 -04001005 stats.run.rs_handle_count = commit_transaction->t_handle_count;
1006 trace_jbd2_run_stats(journal->j_fs_dev->bd_dev,
1007 commit_transaction->t_tid, &stats.run);
Johann Lombardi8e85fb32008-01-28 23:58:27 -05001008
1009 /*
1010 * Calculate overall stats
1011 */
Theodore Ts'obf699322009-09-30 00:32:06 -04001012 spin_lock(&journal->j_history_lock);
Johann Lombardi8e85fb32008-01-28 23:58:27 -05001013 journal->j_stats.ts_tid++;
Theodore Ts'obf699322009-09-30 00:32:06 -04001014 journal->j_stats.run.rs_wait += stats.run.rs_wait;
1015 journal->j_stats.run.rs_running += stats.run.rs_running;
1016 journal->j_stats.run.rs_locked += stats.run.rs_locked;
1017 journal->j_stats.run.rs_flushing += stats.run.rs_flushing;
1018 journal->j_stats.run.rs_logging += stats.run.rs_logging;
1019 journal->j_stats.run.rs_handle_count += stats.run.rs_handle_count;
1020 journal->j_stats.run.rs_blocks += stats.run.rs_blocks;
1021 journal->j_stats.run.rs_blocks_logged += stats.run.rs_blocks_logged;
Johann Lombardi8e85fb32008-01-28 23:58:27 -05001022 spin_unlock(&journal->j_history_lock);
1023
Dave Kleikamp470decc2006-10-11 01:20:57 -07001024 commit_transaction->t_state = T_FINISHED;
1025 J_ASSERT(commit_transaction == journal->j_committing_transaction);
1026 journal->j_commit_sequence = commit_transaction->t_tid;
1027 journal->j_committing_transaction = NULL;
Josef Bacike07f7182008-11-26 01:14:26 -05001028 commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time));
Dave Kleikamp470decc2006-10-11 01:20:57 -07001029
Josef Bacike07f7182008-11-26 01:14:26 -05001030 /*
1031 * weight the commit time higher than the average time so we don't
1032 * react too strongly to vast changes in the commit time
1033 */
1034 if (likely(journal->j_average_commit_time))
1035 journal->j_average_commit_time = (commit_time +
1036 journal->j_average_commit_time*3) / 4;
1037 else
1038 journal->j_average_commit_time = commit_time;
Dave Kleikamp470decc2006-10-11 01:20:57 -07001039 spin_unlock(&journal->j_state_lock);
Theodore Ts'o6c20ec82008-10-28 21:08:20 -04001040
Jan Karaf89b7792007-07-15 23:37:20 -07001041 if (commit_transaction->t_checkpoint_list == NULL &&
1042 commit_transaction->t_checkpoint_io_list == NULL) {
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001043 __jbd2_journal_drop_transaction(journal, commit_transaction);
Aneesh Kumar K.Vfb684072008-11-06 17:50:21 -05001044 to_free = 1;
Dave Kleikamp470decc2006-10-11 01:20:57 -07001045 } else {
1046 if (journal->j_checkpoint_transactions == NULL) {
1047 journal->j_checkpoint_transactions = commit_transaction;
1048 commit_transaction->t_cpnext = commit_transaction;
1049 commit_transaction->t_cpprev = commit_transaction;
1050 } else {
1051 commit_transaction->t_cpnext =
1052 journal->j_checkpoint_transactions;
1053 commit_transaction->t_cpprev =
1054 commit_transaction->t_cpnext->t_cpprev;
1055 commit_transaction->t_cpnext->t_cpprev =
1056 commit_transaction;
1057 commit_transaction->t_cpprev->t_cpnext =
1058 commit_transaction;
1059 }
1060 }
1061 spin_unlock(&journal->j_list_lock);
1062
Aneesh Kumar K.Vfb684072008-11-06 17:50:21 -05001063 if (journal->j_commit_callback)
1064 journal->j_commit_callback(journal, commit_transaction);
1065
Theodore Ts'o879c5e62009-06-17 11:47:48 -04001066 trace_jbd2_end_commit(journal, commit_transaction);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001067 jbd_debug(1, "JBD: commit %d complete, head %d\n",
1068 journal->j_commit_sequence, journal->j_tail_sequence);
Aneesh Kumar K.Vfb684072008-11-06 17:50:21 -05001069 if (to_free)
1070 kfree(commit_transaction);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001071
1072 wake_up(&journal->j_wait_done_commit);
1073}