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470decc6 | 1 | /* |
f7f4bccb | 2 | * linux/fs/jbd2/commit.c |
470decc6 DK |
3 | * |
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> | |
f7f4bccb | 18 | #include <linux/jbd2.h> |
ede86cc4 | 19 | #include <linux/marker.h> |
470decc6 DK |
20 | #include <linux/errno.h> |
21 | #include <linux/slab.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/pagemap.h> | |
8e85fb3f | 24 | #include <linux/jiffies.h> |
818d276c | 25 | #include <linux/crc32.h> |
cd1aac32 AK |
26 | #include <linux/writeback.h> |
27 | #include <linux/backing-dev.h> | |
fd98496f | 28 | #include <linux/bio.h> |
470decc6 DK |
29 | |
30 | /* | |
31 | * Default IO end handler for temporary BJ_IO buffer_heads. | |
32 | */ | |
33 | static void journal_end_buffer_io_sync(struct buffer_head *bh, int uptodate) | |
34 | { | |
35 | BUFFER_TRACE(bh, ""); | |
36 | if (uptodate) | |
37 | set_buffer_uptodate(bh); | |
38 | else | |
39 | clear_buffer_uptodate(bh); | |
40 | unlock_buffer(bh); | |
41 | } | |
42 | ||
43 | /* | |
87c89c23 JK |
44 | * When an ext4 file is truncated, it is possible that some pages are not |
45 | * successfully freed, because they are attached to a committing transaction. | |
470decc6 DK |
46 | * After the transaction commits, these pages are left on the LRU, with no |
47 | * ->mapping, and with attached buffers. These pages are trivially reclaimable | |
48 | * by the VM, but their apparent absence upsets the VM accounting, and it makes | |
49 | * the numbers in /proc/meminfo look odd. | |
50 | * | |
51 | * So here, we have a buffer which has just come off the forget list. Look to | |
52 | * see if we can strip all buffers from the backing page. | |
53 | * | |
54 | * Called under lock_journal(), and possibly under journal_datalist_lock. The | |
55 | * caller provided us with a ref against the buffer, and we drop that here. | |
56 | */ | |
57 | static void release_buffer_page(struct buffer_head *bh) | |
58 | { | |
59 | struct page *page; | |
60 | ||
61 | if (buffer_dirty(bh)) | |
62 | goto nope; | |
63 | if (atomic_read(&bh->b_count) != 1) | |
64 | goto nope; | |
65 | page = bh->b_page; | |
66 | if (!page) | |
67 | goto nope; | |
68 | if (page->mapping) | |
69 | goto nope; | |
70 | ||
71 | /* OK, it's a truncated page */ | |
529ae9aa | 72 | if (!trylock_page(page)) |
470decc6 DK |
73 | goto nope; |
74 | ||
75 | page_cache_get(page); | |
76 | __brelse(bh); | |
77 | try_to_free_buffers(page); | |
78 | unlock_page(page); | |
79 | page_cache_release(page); | |
80 | return; | |
81 | ||
82 | nope: | |
83 | __brelse(bh); | |
84 | } | |
85 | ||
818d276c GS |
86 | /* |
87 | * Done it all: now submit the commit record. We should have | |
470decc6 DK |
88 | * cleaned up our previous buffers by now, so if we are in abort |
89 | * mode we can now just skip the rest of the journal write | |
90 | * entirely. | |
91 | * | |
92 | * Returns 1 if the journal needs to be aborted or 0 on success | |
93 | */ | |
818d276c GS |
94 | static int journal_submit_commit_record(journal_t *journal, |
95 | transaction_t *commit_transaction, | |
96 | struct buffer_head **cbh, | |
97 | __u32 crc32_sum) | |
470decc6 DK |
98 | { |
99 | struct journal_head *descriptor; | |
818d276c | 100 | struct commit_header *tmp; |
470decc6 | 101 | struct buffer_head *bh; |
818d276c | 102 | int ret; |
470decc6 | 103 | int barrier_done = 0; |
736603ab | 104 | struct timespec now = current_kernel_time(); |
470decc6 DK |
105 | |
106 | if (is_journal_aborted(journal)) | |
107 | return 0; | |
108 | ||
f7f4bccb | 109 | descriptor = jbd2_journal_get_descriptor_buffer(journal); |
470decc6 DK |
110 | if (!descriptor) |
111 | return 1; | |
112 | ||
113 | bh = jh2bh(descriptor); | |
114 | ||
818d276c GS |
115 | tmp = (struct commit_header *)bh->b_data; |
116 | tmp->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); | |
117 | tmp->h_blocktype = cpu_to_be32(JBD2_COMMIT_BLOCK); | |
118 | tmp->h_sequence = cpu_to_be32(commit_transaction->t_tid); | |
736603ab TT |
119 | tmp->h_commit_sec = cpu_to_be64(now.tv_sec); |
120 | tmp->h_commit_nsec = cpu_to_be32(now.tv_nsec); | |
818d276c GS |
121 | |
122 | if (JBD2_HAS_COMPAT_FEATURE(journal, | |
123 | JBD2_FEATURE_COMPAT_CHECKSUM)) { | |
124 | tmp->h_chksum_type = JBD2_CRC32_CHKSUM; | |
125 | tmp->h_chksum_size = JBD2_CRC32_CHKSUM_SIZE; | |
126 | tmp->h_chksum[0] = cpu_to_be32(crc32_sum); | |
470decc6 DK |
127 | } |
128 | ||
818d276c GS |
129 | JBUFFER_TRACE(descriptor, "submit commit block"); |
130 | lock_buffer(bh); | |
45a90bfd | 131 | clear_buffer_dirty(bh); |
818d276c GS |
132 | set_buffer_uptodate(bh); |
133 | bh->b_end_io = journal_end_buffer_io_sync; | |
134 | ||
135 | if (journal->j_flags & JBD2_BARRIER && | |
4d605179 | 136 | !JBD2_HAS_INCOMPAT_FEATURE(journal, |
818d276c | 137 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { |
470decc6 DK |
138 | set_buffer_ordered(bh); |
139 | barrier_done = 1; | |
140 | } | |
818d276c | 141 | ret = submit_bh(WRITE, bh); |
c4e35e07 DK |
142 | if (barrier_done) |
143 | clear_buffer_ordered(bh); | |
818d276c | 144 | |
470decc6 DK |
145 | /* is it possible for another commit to fail at roughly |
146 | * the same time as this one? If so, we don't want to | |
147 | * trust the barrier flag in the super, but instead want | |
148 | * to remember if we sent a barrier request | |
149 | */ | |
150 | if (ret == -EOPNOTSUPP && barrier_done) { | |
470decc6 | 151 | printk(KERN_WARNING |
05496769 TT |
152 | "JBD: barrier-based sync failed on %s - " |
153 | "disabling barriers\n", journal->j_devname); | |
470decc6 | 154 | spin_lock(&journal->j_state_lock); |
f7f4bccb | 155 | journal->j_flags &= ~JBD2_BARRIER; |
470decc6 DK |
156 | spin_unlock(&journal->j_state_lock); |
157 | ||
158 | /* And try again, without the barrier */ | |
034772b0 | 159 | lock_buffer(bh); |
470decc6 | 160 | set_buffer_uptodate(bh); |
45a90bfd | 161 | clear_buffer_dirty(bh); |
818d276c | 162 | ret = submit_bh(WRITE, bh); |
470decc6 | 163 | } |
818d276c GS |
164 | *cbh = bh; |
165 | return ret; | |
166 | } | |
167 | ||
168 | /* | |
169 | * This function along with journal_submit_commit_record | |
170 | * allows to write the commit record asynchronously. | |
171 | */ | |
fd98496f TT |
172 | static int journal_wait_on_commit_record(journal_t *journal, |
173 | struct buffer_head *bh) | |
818d276c GS |
174 | { |
175 | int ret = 0; | |
176 | ||
fd98496f | 177 | retry: |
818d276c GS |
178 | clear_buffer_dirty(bh); |
179 | wait_on_buffer(bh); | |
fd98496f TT |
180 | if (buffer_eopnotsupp(bh) && (journal->j_flags & JBD2_BARRIER)) { |
181 | printk(KERN_WARNING | |
182 | "JBD2: wait_on_commit_record: sync failed on %s - " | |
183 | "disabling barriers\n", journal->j_devname); | |
184 | spin_lock(&journal->j_state_lock); | |
185 | journal->j_flags &= ~JBD2_BARRIER; | |
186 | spin_unlock(&journal->j_state_lock); | |
187 | ||
188 | lock_buffer(bh); | |
189 | clear_buffer_dirty(bh); | |
190 | set_buffer_uptodate(bh); | |
191 | bh->b_end_io = journal_end_buffer_io_sync; | |
192 | ||
193 | ret = submit_bh(WRITE_SYNC, bh); | |
194 | if (ret) { | |
195 | unlock_buffer(bh); | |
196 | return ret; | |
197 | } | |
198 | goto retry; | |
199 | } | |
470decc6 | 200 | |
818d276c GS |
201 | if (unlikely(!buffer_uptodate(bh))) |
202 | ret = -EIO; | |
203 | put_bh(bh); /* One for getblk() */ | |
204 | jbd2_journal_put_journal_head(bh2jh(bh)); | |
205 | ||
206 | return ret; | |
470decc6 DK |
207 | } |
208 | ||
cd1aac32 AK |
209 | /* |
210 | * write the filemap data using writepage() address_space_operations. | |
211 | * We don't do block allocation here even for delalloc. We don't | |
212 | * use writepages() because with dealyed allocation we may be doing | |
213 | * block allocation in writepages(). | |
214 | */ | |
215 | static int journal_submit_inode_data_buffers(struct address_space *mapping) | |
216 | { | |
217 | int ret; | |
218 | struct writeback_control wbc = { | |
219 | .sync_mode = WB_SYNC_ALL, | |
220 | .nr_to_write = mapping->nrpages * 2, | |
221 | .range_start = 0, | |
222 | .range_end = i_size_read(mapping->host), | |
223 | .for_writepages = 1, | |
224 | }; | |
225 | ||
226 | ret = generic_writepages(mapping, &wbc); | |
227 | return ret; | |
228 | } | |
229 | ||
c851ed54 JK |
230 | /* |
231 | * 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 | */ | |
cd1aac32 | 238 | static int journal_submit_data_buffers(journal_t *journal, |
c851ed54 JK |
239 | 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); | |
cd1aac32 AK |
250 | /* |
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 | */ | |
256 | err = journal_submit_inode_data_buffers(mapping); | |
c851ed54 JK |
257 | if (!ret) |
258 | ret = err; | |
259 | spin_lock(&journal->j_list_lock); | |
260 | J_ASSERT(jinode->i_transaction == commit_transaction); | |
261 | jinode->i_flags &= ~JI_COMMIT_RUNNING; | |
262 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); | |
263 | } | |
264 | spin_unlock(&journal->j_list_lock); | |
265 | return ret; | |
266 | } | |
267 | ||
268 | /* | |
269 | * Wait for data submitted for writeout, refile inodes to proper | |
270 | * transaction if needed. | |
271 | * | |
272 | */ | |
273 | static int journal_finish_inode_data_buffers(journal_t *journal, | |
274 | transaction_t *commit_transaction) | |
275 | { | |
276 | struct jbd2_inode *jinode, *next_i; | |
277 | int err, ret = 0; | |
278 | ||
cd1aac32 | 279 | /* For locking, see the comment in journal_submit_data_buffers() */ |
c851ed54 JK |
280 | spin_lock(&journal->j_list_lock); |
281 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { | |
282 | jinode->i_flags |= JI_COMMIT_RUNNING; | |
283 | spin_unlock(&journal->j_list_lock); | |
284 | err = filemap_fdatawait(jinode->i_vfs_inode->i_mapping); | |
e9e34f4e HK |
285 | if (err) { |
286 | /* | |
287 | * Because AS_EIO is cleared by | |
288 | * wait_on_page_writeback_range(), set it again so | |
289 | * that user process can get -EIO from fsync(). | |
290 | */ | |
291 | set_bit(AS_EIO, | |
292 | &jinode->i_vfs_inode->i_mapping->flags); | |
293 | ||
294 | if (!ret) | |
295 | ret = err; | |
296 | } | |
c851ed54 JK |
297 | spin_lock(&journal->j_list_lock); |
298 | jinode->i_flags &= ~JI_COMMIT_RUNNING; | |
299 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); | |
300 | } | |
301 | ||
302 | /* Now refile inode to proper lists */ | |
303 | list_for_each_entry_safe(jinode, next_i, | |
304 | &commit_transaction->t_inode_list, i_list) { | |
305 | list_del(&jinode->i_list); | |
306 | if (jinode->i_next_transaction) { | |
307 | jinode->i_transaction = jinode->i_next_transaction; | |
308 | jinode->i_next_transaction = NULL; | |
309 | list_add(&jinode->i_list, | |
310 | &jinode->i_transaction->t_inode_list); | |
311 | } else { | |
312 | jinode->i_transaction = NULL; | |
313 | } | |
314 | } | |
315 | spin_unlock(&journal->j_list_lock); | |
316 | ||
317 | return ret; | |
318 | } | |
319 | ||
818d276c GS |
320 | static __u32 jbd2_checksum_data(__u32 crc32_sum, struct buffer_head *bh) |
321 | { | |
322 | struct page *page = bh->b_page; | |
323 | char *addr; | |
324 | __u32 checksum; | |
325 | ||
326 | addr = kmap_atomic(page, KM_USER0); | |
327 | checksum = crc32_be(crc32_sum, | |
328 | (void *)(addr + offset_in_page(bh->b_data)), bh->b_size); | |
329 | kunmap_atomic(addr, KM_USER0); | |
330 | ||
331 | return checksum; | |
332 | } | |
333 | ||
334 | static void write_tag_block(int tag_bytes, journal_block_tag_t *tag, | |
18eba7aa | 335 | unsigned long long block) |
b517bea1 ZB |
336 | { |
337 | tag->t_blocknr = cpu_to_be32(block & (u32)~0); | |
cd02ff0b | 338 | if (tag_bytes > JBD2_TAG_SIZE32) |
b517bea1 ZB |
339 | tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1); |
340 | } | |
341 | ||
470decc6 | 342 | /* |
f7f4bccb | 343 | * jbd2_journal_commit_transaction |
470decc6 DK |
344 | * |
345 | * The primary function for committing a transaction to the log. This | |
346 | * function is called by the journal thread to begin a complete commit. | |
347 | */ | |
f7f4bccb | 348 | void jbd2_journal_commit_transaction(journal_t *journal) |
470decc6 | 349 | { |
8e85fb3f | 350 | struct transaction_stats_s stats; |
470decc6 DK |
351 | transaction_t *commit_transaction; |
352 | struct journal_head *jh, *new_jh, *descriptor; | |
353 | struct buffer_head **wbuf = journal->j_wbuf; | |
354 | int bufs; | |
355 | int flags; | |
356 | int err; | |
18eba7aa | 357 | unsigned long long blocknr; |
470decc6 DK |
358 | char *tagp = NULL; |
359 | journal_header_t *header; | |
360 | journal_block_tag_t *tag = NULL; | |
361 | int space_left = 0; | |
362 | int first_tag = 0; | |
363 | int tag_flag; | |
364 | int i; | |
b517bea1 | 365 | int tag_bytes = journal_tag_bytes(journal); |
818d276c GS |
366 | struct buffer_head *cbh = NULL; /* For transactional checksums */ |
367 | __u32 crc32_sum = ~0; | |
470decc6 DK |
368 | |
369 | /* | |
370 | * First job: lock down the current transaction and wait for | |
371 | * all outstanding updates to complete. | |
372 | */ | |
373 | ||
374 | #ifdef COMMIT_STATS | |
375 | spin_lock(&journal->j_list_lock); | |
376 | summarise_journal_usage(journal); | |
377 | spin_unlock(&journal->j_list_lock); | |
378 | #endif | |
379 | ||
f7f4bccb MC |
380 | /* Do we need to erase the effects of a prior jbd2_journal_flush? */ |
381 | if (journal->j_flags & JBD2_FLUSHED) { | |
470decc6 | 382 | jbd_debug(3, "super block updated\n"); |
f7f4bccb | 383 | jbd2_journal_update_superblock(journal, 1); |
470decc6 DK |
384 | } else { |
385 | jbd_debug(3, "superblock not updated\n"); | |
386 | } | |
387 | ||
388 | J_ASSERT(journal->j_running_transaction != NULL); | |
389 | J_ASSERT(journal->j_committing_transaction == NULL); | |
390 | ||
391 | commit_transaction = journal->j_running_transaction; | |
392 | J_ASSERT(commit_transaction->t_state == T_RUNNING); | |
393 | ||
ede86cc4 TT |
394 | trace_mark(jbd2_start_commit, "dev %s transaction %d", |
395 | journal->j_devname, commit_transaction->t_tid); | |
470decc6 DK |
396 | jbd_debug(1, "JBD: starting commit of transaction %d\n", |
397 | commit_transaction->t_tid); | |
398 | ||
399 | spin_lock(&journal->j_state_lock); | |
400 | commit_transaction->t_state = T_LOCKED; | |
401 | ||
8e85fb3f JL |
402 | stats.u.run.rs_wait = commit_transaction->t_max_wait; |
403 | stats.u.run.rs_locked = jiffies; | |
404 | stats.u.run.rs_running = jbd2_time_diff(commit_transaction->t_start, | |
405 | stats.u.run.rs_locked); | |
406 | ||
470decc6 DK |
407 | spin_lock(&commit_transaction->t_handle_lock); |
408 | while (commit_transaction->t_updates) { | |
409 | DEFINE_WAIT(wait); | |
410 | ||
411 | prepare_to_wait(&journal->j_wait_updates, &wait, | |
412 | TASK_UNINTERRUPTIBLE); | |
413 | if (commit_transaction->t_updates) { | |
414 | spin_unlock(&commit_transaction->t_handle_lock); | |
415 | spin_unlock(&journal->j_state_lock); | |
416 | schedule(); | |
417 | spin_lock(&journal->j_state_lock); | |
418 | spin_lock(&commit_transaction->t_handle_lock); | |
419 | } | |
420 | finish_wait(&journal->j_wait_updates, &wait); | |
421 | } | |
422 | spin_unlock(&commit_transaction->t_handle_lock); | |
423 | ||
424 | J_ASSERT (commit_transaction->t_outstanding_credits <= | |
425 | journal->j_max_transaction_buffers); | |
426 | ||
427 | /* | |
428 | * First thing we are allowed to do is to discard any remaining | |
429 | * BJ_Reserved buffers. Note, it is _not_ permissible to assume | |
430 | * that there are no such buffers: if a large filesystem | |
431 | * operation like a truncate needs to split itself over multiple | |
f7f4bccb | 432 | * transactions, then it may try to do a jbd2_journal_restart() while |
470decc6 DK |
433 | * there are still BJ_Reserved buffers outstanding. These must |
434 | * be released cleanly from the current transaction. | |
435 | * | |
436 | * In this case, the filesystem must still reserve write access | |
437 | * again before modifying the buffer in the new transaction, but | |
438 | * we do not require it to remember exactly which old buffers it | |
439 | * has reserved. This is consistent with the existing behaviour | |
f7f4bccb | 440 | * that multiple jbd2_journal_get_write_access() calls to the same |
470decc6 DK |
441 | * buffer are perfectly permissable. |
442 | */ | |
443 | while (commit_transaction->t_reserved_list) { | |
444 | jh = commit_transaction->t_reserved_list; | |
445 | JBUFFER_TRACE(jh, "reserved, unused: refile"); | |
446 | /* | |
f7f4bccb | 447 | * A jbd2_journal_get_undo_access()+jbd2_journal_release_buffer() may |
470decc6 DK |
448 | * leave undo-committed data. |
449 | */ | |
450 | if (jh->b_committed_data) { | |
451 | struct buffer_head *bh = jh2bh(jh); | |
452 | ||
453 | jbd_lock_bh_state(bh); | |
af1e76d6 | 454 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
455 | jh->b_committed_data = NULL; |
456 | jbd_unlock_bh_state(bh); | |
457 | } | |
f7f4bccb | 458 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
459 | } |
460 | ||
461 | /* | |
462 | * Now try to drop any written-back buffers from the journal's | |
463 | * checkpoint lists. We do this *before* commit because it potentially | |
464 | * frees some memory | |
465 | */ | |
466 | spin_lock(&journal->j_list_lock); | |
f7f4bccb | 467 | __jbd2_journal_clean_checkpoint_list(journal); |
470decc6 DK |
468 | spin_unlock(&journal->j_list_lock); |
469 | ||
470 | jbd_debug (3, "JBD: commit phase 1\n"); | |
471 | ||
472 | /* | |
473 | * Switch to a new revoke table. | |
474 | */ | |
f7f4bccb | 475 | jbd2_journal_switch_revoke_table(journal); |
470decc6 | 476 | |
8e85fb3f JL |
477 | stats.u.run.rs_flushing = jiffies; |
478 | stats.u.run.rs_locked = jbd2_time_diff(stats.u.run.rs_locked, | |
479 | stats.u.run.rs_flushing); | |
480 | ||
470decc6 DK |
481 | commit_transaction->t_state = T_FLUSH; |
482 | journal->j_committing_transaction = commit_transaction; | |
483 | journal->j_running_transaction = NULL; | |
484 | commit_transaction->t_log_start = journal->j_head; | |
485 | wake_up(&journal->j_wait_transaction_locked); | |
486 | spin_unlock(&journal->j_state_lock); | |
487 | ||
488 | jbd_debug (3, "JBD: commit phase 2\n"); | |
489 | ||
470decc6 DK |
490 | /* |
491 | * Now start flushing things to disk, in the order they appear | |
492 | * on the transaction lists. Data blocks go first. | |
493 | */ | |
cd1aac32 | 494 | err = journal_submit_data_buffers(journal, commit_transaction); |
470decc6 | 495 | if (err) |
a7fa2baf | 496 | jbd2_journal_abort(journal, err); |
470decc6 | 497 | |
f7f4bccb | 498 | jbd2_journal_write_revoke_records(journal, commit_transaction); |
470decc6 DK |
499 | |
500 | jbd_debug(3, "JBD: commit phase 2\n"); | |
501 | ||
470decc6 DK |
502 | /* |
503 | * Way to go: we have now written out all of the data for a | |
504 | * transaction! Now comes the tricky part: we need to write out | |
505 | * metadata. Loop over the transaction's entire buffer list: | |
506 | */ | |
02c471cb | 507 | spin_lock(&journal->j_state_lock); |
470decc6 | 508 | commit_transaction->t_state = T_COMMIT; |
02c471cb | 509 | spin_unlock(&journal->j_state_lock); |
470decc6 | 510 | |
8e85fb3f JL |
511 | stats.u.run.rs_logging = jiffies; |
512 | stats.u.run.rs_flushing = jbd2_time_diff(stats.u.run.rs_flushing, | |
513 | stats.u.run.rs_logging); | |
514 | stats.u.run.rs_blocks = commit_transaction->t_outstanding_credits; | |
515 | stats.u.run.rs_blocks_logged = 0; | |
516 | ||
1dfc3220 JB |
517 | J_ASSERT(commit_transaction->t_nr_buffers <= |
518 | commit_transaction->t_outstanding_credits); | |
519 | ||
87c89c23 | 520 | err = 0; |
470decc6 DK |
521 | descriptor = NULL; |
522 | bufs = 0; | |
523 | while (commit_transaction->t_buffers) { | |
524 | ||
525 | /* Find the next buffer to be journaled... */ | |
526 | ||
527 | jh = commit_transaction->t_buffers; | |
528 | ||
529 | /* If we're in abort mode, we just un-journal the buffer and | |
7ad7445f | 530 | release it. */ |
470decc6 DK |
531 | |
532 | if (is_journal_aborted(journal)) { | |
7ad7445f | 533 | clear_buffer_jbddirty(jh2bh(jh)); |
470decc6 | 534 | JBUFFER_TRACE(jh, "journal is aborting: refile"); |
f7f4bccb | 535 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
536 | /* If that was the last one, we need to clean up |
537 | * any descriptor buffers which may have been | |
538 | * already allocated, even if we are now | |
539 | * aborting. */ | |
540 | if (!commit_transaction->t_buffers) | |
541 | goto start_journal_io; | |
542 | continue; | |
543 | } | |
544 | ||
545 | /* Make sure we have a descriptor block in which to | |
546 | record the metadata buffer. */ | |
547 | ||
548 | if (!descriptor) { | |
549 | struct buffer_head *bh; | |
550 | ||
551 | J_ASSERT (bufs == 0); | |
552 | ||
553 | jbd_debug(4, "JBD: get descriptor\n"); | |
554 | ||
f7f4bccb | 555 | descriptor = jbd2_journal_get_descriptor_buffer(journal); |
470decc6 | 556 | if (!descriptor) { |
a7fa2baf | 557 | jbd2_journal_abort(journal, -EIO); |
470decc6 DK |
558 | continue; |
559 | } | |
560 | ||
561 | bh = jh2bh(descriptor); | |
562 | jbd_debug(4, "JBD: got buffer %llu (%p)\n", | |
563 | (unsigned long long)bh->b_blocknr, bh->b_data); | |
564 | header = (journal_header_t *)&bh->b_data[0]; | |
f7f4bccb MC |
565 | header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); |
566 | header->h_blocktype = cpu_to_be32(JBD2_DESCRIPTOR_BLOCK); | |
470decc6 DK |
567 | header->h_sequence = cpu_to_be32(commit_transaction->t_tid); |
568 | ||
569 | tagp = &bh->b_data[sizeof(journal_header_t)]; | |
570 | space_left = bh->b_size - sizeof(journal_header_t); | |
571 | first_tag = 1; | |
572 | set_buffer_jwrite(bh); | |
573 | set_buffer_dirty(bh); | |
574 | wbuf[bufs++] = bh; | |
575 | ||
576 | /* Record it so that we can wait for IO | |
577 | completion later */ | |
578 | BUFFER_TRACE(bh, "ph3: file as descriptor"); | |
f7f4bccb | 579 | jbd2_journal_file_buffer(descriptor, commit_transaction, |
470decc6 DK |
580 | BJ_LogCtl); |
581 | } | |
582 | ||
583 | /* Where is the buffer to be written? */ | |
584 | ||
f7f4bccb | 585 | err = jbd2_journal_next_log_block(journal, &blocknr); |
470decc6 DK |
586 | /* If the block mapping failed, just abandon the buffer |
587 | and repeat this loop: we'll fall into the | |
588 | refile-on-abort condition above. */ | |
589 | if (err) { | |
a7fa2baf | 590 | jbd2_journal_abort(journal, err); |
470decc6 DK |
591 | continue; |
592 | } | |
593 | ||
594 | /* | |
595 | * start_this_handle() uses t_outstanding_credits to determine | |
596 | * the free space in the log, but this counter is changed | |
f7f4bccb | 597 | * by jbd2_journal_next_log_block() also. |
470decc6 DK |
598 | */ |
599 | commit_transaction->t_outstanding_credits--; | |
600 | ||
601 | /* Bump b_count to prevent truncate from stumbling over | |
602 | the shadowed buffer! @@@ This can go if we ever get | |
603 | rid of the BJ_IO/BJ_Shadow pairing of buffers. */ | |
604 | atomic_inc(&jh2bh(jh)->b_count); | |
605 | ||
606 | /* Make a temporary IO buffer with which to write it out | |
607 | (this will requeue both the metadata buffer and the | |
608 | temporary IO buffer). new_bh goes on BJ_IO*/ | |
609 | ||
610 | set_bit(BH_JWrite, &jh2bh(jh)->b_state); | |
611 | /* | |
f7f4bccb | 612 | * akpm: jbd2_journal_write_metadata_buffer() sets |
470decc6 DK |
613 | * new_bh->b_transaction to commit_transaction. |
614 | * We need to clean this up before we release new_bh | |
615 | * (which is of type BJ_IO) | |
616 | */ | |
617 | JBUFFER_TRACE(jh, "ph3: write metadata"); | |
f7f4bccb | 618 | flags = jbd2_journal_write_metadata_buffer(commit_transaction, |
470decc6 DK |
619 | jh, &new_jh, blocknr); |
620 | set_bit(BH_JWrite, &jh2bh(new_jh)->b_state); | |
621 | wbuf[bufs++] = jh2bh(new_jh); | |
622 | ||
623 | /* Record the new block's tag in the current descriptor | |
624 | buffer */ | |
625 | ||
626 | tag_flag = 0; | |
627 | if (flags & 1) | |
f7f4bccb | 628 | tag_flag |= JBD2_FLAG_ESCAPE; |
470decc6 | 629 | if (!first_tag) |
f7f4bccb | 630 | tag_flag |= JBD2_FLAG_SAME_UUID; |
470decc6 DK |
631 | |
632 | tag = (journal_block_tag_t *) tagp; | |
b517bea1 | 633 | write_tag_block(tag_bytes, tag, jh2bh(jh)->b_blocknr); |
470decc6 | 634 | tag->t_flags = cpu_to_be32(tag_flag); |
b517bea1 ZB |
635 | tagp += tag_bytes; |
636 | space_left -= tag_bytes; | |
470decc6 DK |
637 | |
638 | if (first_tag) { | |
639 | memcpy (tagp, journal->j_uuid, 16); | |
640 | tagp += 16; | |
641 | space_left -= 16; | |
642 | first_tag = 0; | |
643 | } | |
644 | ||
645 | /* If there's no more to do, or if the descriptor is full, | |
646 | let the IO rip! */ | |
647 | ||
648 | if (bufs == journal->j_wbufsize || | |
649 | commit_transaction->t_buffers == NULL || | |
b517bea1 | 650 | space_left < tag_bytes + 16) { |
470decc6 DK |
651 | |
652 | jbd_debug(4, "JBD: Submit %d IOs\n", bufs); | |
653 | ||
654 | /* Write an end-of-descriptor marker before | |
655 | submitting the IOs. "tag" still points to | |
656 | the last tag we set up. */ | |
657 | ||
f7f4bccb | 658 | tag->t_flags |= cpu_to_be32(JBD2_FLAG_LAST_TAG); |
470decc6 DK |
659 | |
660 | start_journal_io: | |
661 | for (i = 0; i < bufs; i++) { | |
662 | struct buffer_head *bh = wbuf[i]; | |
818d276c GS |
663 | /* |
664 | * Compute checksum. | |
665 | */ | |
666 | if (JBD2_HAS_COMPAT_FEATURE(journal, | |
667 | JBD2_FEATURE_COMPAT_CHECKSUM)) { | |
668 | crc32_sum = | |
669 | jbd2_checksum_data(crc32_sum, bh); | |
670 | } | |
671 | ||
470decc6 DK |
672 | lock_buffer(bh); |
673 | clear_buffer_dirty(bh); | |
674 | set_buffer_uptodate(bh); | |
675 | bh->b_end_io = journal_end_buffer_io_sync; | |
676 | submit_bh(WRITE, bh); | |
677 | } | |
678 | cond_resched(); | |
8e85fb3f | 679 | stats.u.run.rs_blocks_logged += bufs; |
470decc6 DK |
680 | |
681 | /* Force a new descriptor to be generated next | |
682 | time round the loop. */ | |
683 | descriptor = NULL; | |
684 | bufs = 0; | |
685 | } | |
686 | } | |
687 | ||
818d276c GS |
688 | /* Done it all: now write the commit record asynchronously. */ |
689 | ||
690 | if (JBD2_HAS_INCOMPAT_FEATURE(journal, | |
691 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { | |
692 | err = journal_submit_commit_record(journal, commit_transaction, | |
693 | &cbh, crc32_sum); | |
694 | if (err) | |
695 | __jbd2_journal_abort_hard(journal); | |
818d276c GS |
696 | } |
697 | ||
c851ed54 JK |
698 | /* |
699 | * This is the right place to wait for data buffers both for ASYNC | |
700 | * and !ASYNC commit. If commit is ASYNC, we need to wait only after | |
701 | * the commit block went to disk (which happens above). If commit is | |
702 | * SYNC, we need to wait for data buffers before we start writing | |
703 | * commit block, which happens below in such setting. | |
704 | */ | |
705 | err = journal_finish_inode_data_buffers(journal, commit_transaction); | |
e9e34f4e | 706 | if (err) { |
e9e34f4e HK |
707 | printk(KERN_WARNING |
708 | "JBD2: Detected IO errors while flushing file data " | |
05496769 | 709 | "on %s\n", journal->j_devname); |
5bf5683a HK |
710 | if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR) |
711 | jbd2_journal_abort(journal, err); | |
e9e34f4e HK |
712 | err = 0; |
713 | } | |
c851ed54 | 714 | |
470decc6 DK |
715 | /* Lo and behold: we have just managed to send a transaction to |
716 | the log. Before we can commit it, wait for the IO so far to | |
717 | complete. Control buffers being written are on the | |
718 | transaction's t_log_list queue, and metadata buffers are on | |
719 | the t_iobuf_list queue. | |
720 | ||
721 | Wait for the buffers in reverse order. That way we are | |
722 | less likely to be woken up until all IOs have completed, and | |
723 | so we incur less scheduling load. | |
724 | */ | |
725 | ||
87c89c23 | 726 | jbd_debug(3, "JBD: commit phase 3\n"); |
470decc6 DK |
727 | |
728 | /* | |
729 | * akpm: these are BJ_IO, and j_list_lock is not needed. | |
730 | * See __journal_try_to_free_buffer. | |
731 | */ | |
732 | wait_for_iobuf: | |
733 | while (commit_transaction->t_iobuf_list != NULL) { | |
734 | struct buffer_head *bh; | |
735 | ||
736 | jh = commit_transaction->t_iobuf_list->b_tprev; | |
737 | bh = jh2bh(jh); | |
738 | if (buffer_locked(bh)) { | |
739 | wait_on_buffer(bh); | |
740 | goto wait_for_iobuf; | |
741 | } | |
742 | if (cond_resched()) | |
743 | goto wait_for_iobuf; | |
744 | ||
745 | if (unlikely(!buffer_uptodate(bh))) | |
746 | err = -EIO; | |
747 | ||
748 | clear_buffer_jwrite(bh); | |
749 | ||
750 | JBUFFER_TRACE(jh, "ph4: unfile after journal write"); | |
f7f4bccb | 751 | jbd2_journal_unfile_buffer(journal, jh); |
470decc6 DK |
752 | |
753 | /* | |
754 | * ->t_iobuf_list should contain only dummy buffer_heads | |
f7f4bccb | 755 | * which were created by jbd2_journal_write_metadata_buffer(). |
470decc6 DK |
756 | */ |
757 | BUFFER_TRACE(bh, "dumping temporary bh"); | |
f7f4bccb | 758 | jbd2_journal_put_journal_head(jh); |
470decc6 DK |
759 | __brelse(bh); |
760 | J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0); | |
761 | free_buffer_head(bh); | |
762 | ||
763 | /* We also have to unlock and free the corresponding | |
764 | shadowed buffer */ | |
765 | jh = commit_transaction->t_shadow_list->b_tprev; | |
766 | bh = jh2bh(jh); | |
767 | clear_bit(BH_JWrite, &bh->b_state); | |
768 | J_ASSERT_BH(bh, buffer_jbddirty(bh)); | |
769 | ||
770 | /* The metadata is now released for reuse, but we need | |
771 | to remember it against this transaction so that when | |
772 | we finally commit, we can do any checkpointing | |
773 | required. */ | |
774 | JBUFFER_TRACE(jh, "file as BJ_Forget"); | |
f7f4bccb | 775 | jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget); |
470decc6 DK |
776 | /* Wake up any transactions which were waiting for this |
777 | IO to complete */ | |
778 | wake_up_bit(&bh->b_state, BH_Unshadow); | |
779 | JBUFFER_TRACE(jh, "brelse shadowed buffer"); | |
780 | __brelse(bh); | |
781 | } | |
782 | ||
783 | J_ASSERT (commit_transaction->t_shadow_list == NULL); | |
784 | ||
87c89c23 | 785 | jbd_debug(3, "JBD: commit phase 4\n"); |
470decc6 DK |
786 | |
787 | /* Here we wait for the revoke record and descriptor record buffers */ | |
788 | wait_for_ctlbuf: | |
789 | while (commit_transaction->t_log_list != NULL) { | |
790 | struct buffer_head *bh; | |
791 | ||
792 | jh = commit_transaction->t_log_list->b_tprev; | |
793 | bh = jh2bh(jh); | |
794 | if (buffer_locked(bh)) { | |
795 | wait_on_buffer(bh); | |
796 | goto wait_for_ctlbuf; | |
797 | } | |
798 | if (cond_resched()) | |
799 | goto wait_for_ctlbuf; | |
800 | ||
801 | if (unlikely(!buffer_uptodate(bh))) | |
802 | err = -EIO; | |
803 | ||
804 | BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile"); | |
805 | clear_buffer_jwrite(bh); | |
f7f4bccb MC |
806 | jbd2_journal_unfile_buffer(journal, jh); |
807 | jbd2_journal_put_journal_head(jh); | |
470decc6 DK |
808 | __brelse(bh); /* One for getblk */ |
809 | /* AKPM: bforget here */ | |
810 | } | |
811 | ||
77e841de HK |
812 | if (err) |
813 | jbd2_journal_abort(journal, err); | |
814 | ||
87c89c23 | 815 | jbd_debug(3, "JBD: commit phase 5\n"); |
470decc6 | 816 | |
818d276c GS |
817 | if (!JBD2_HAS_INCOMPAT_FEATURE(journal, |
818 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { | |
819 | err = journal_submit_commit_record(journal, commit_transaction, | |
820 | &cbh, crc32_sum); | |
821 | if (err) | |
822 | __jbd2_journal_abort_hard(journal); | |
823 | } | |
b048d846 | 824 | if (!err && !is_journal_aborted(journal)) |
fd98496f | 825 | err = journal_wait_on_commit_record(journal, cbh); |
470decc6 DK |
826 | |
827 | if (err) | |
a7fa2baf | 828 | jbd2_journal_abort(journal, err); |
470decc6 DK |
829 | |
830 | /* End of a transaction! Finally, we can do checkpoint | |
831 | processing: any buffers committed as a result of this | |
832 | transaction can be removed from any checkpoint list it was on | |
833 | before. */ | |
834 | ||
87c89c23 | 835 | jbd_debug(3, "JBD: commit phase 6\n"); |
470decc6 | 836 | |
c851ed54 | 837 | J_ASSERT(list_empty(&commit_transaction->t_inode_list)); |
470decc6 DK |
838 | J_ASSERT(commit_transaction->t_buffers == NULL); |
839 | J_ASSERT(commit_transaction->t_checkpoint_list == NULL); | |
840 | J_ASSERT(commit_transaction->t_iobuf_list == NULL); | |
841 | J_ASSERT(commit_transaction->t_shadow_list == NULL); | |
842 | J_ASSERT(commit_transaction->t_log_list == NULL); | |
843 | ||
844 | restart_loop: | |
845 | /* | |
846 | * As there are other places (journal_unmap_buffer()) adding buffers | |
847 | * to this list we have to be careful and hold the j_list_lock. | |
848 | */ | |
849 | spin_lock(&journal->j_list_lock); | |
850 | while (commit_transaction->t_forget) { | |
851 | transaction_t *cp_transaction; | |
852 | struct buffer_head *bh; | |
853 | ||
854 | jh = commit_transaction->t_forget; | |
855 | spin_unlock(&journal->j_list_lock); | |
856 | bh = jh2bh(jh); | |
857 | jbd_lock_bh_state(bh); | |
858 | J_ASSERT_JH(jh, jh->b_transaction == commit_transaction || | |
859 | jh->b_transaction == journal->j_running_transaction); | |
860 | ||
861 | /* | |
862 | * If there is undo-protected committed data against | |
863 | * this buffer, then we can remove it now. If it is a | |
864 | * buffer needing such protection, the old frozen_data | |
865 | * field now points to a committed version of the | |
866 | * buffer, so rotate that field to the new committed | |
867 | * data. | |
868 | * | |
869 | * Otherwise, we can just throw away the frozen data now. | |
870 | */ | |
871 | if (jh->b_committed_data) { | |
af1e76d6 | 872 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
873 | jh->b_committed_data = NULL; |
874 | if (jh->b_frozen_data) { | |
875 | jh->b_committed_data = jh->b_frozen_data; | |
876 | jh->b_frozen_data = NULL; | |
877 | } | |
878 | } else if (jh->b_frozen_data) { | |
af1e76d6 | 879 | jbd2_free(jh->b_frozen_data, bh->b_size); |
470decc6 DK |
880 | jh->b_frozen_data = NULL; |
881 | } | |
882 | ||
883 | spin_lock(&journal->j_list_lock); | |
884 | cp_transaction = jh->b_cp_transaction; | |
885 | if (cp_transaction) { | |
886 | JBUFFER_TRACE(jh, "remove from old cp transaction"); | |
8e85fb3f | 887 | cp_transaction->t_chp_stats.cs_dropped++; |
f7f4bccb | 888 | __jbd2_journal_remove_checkpoint(jh); |
470decc6 DK |
889 | } |
890 | ||
891 | /* Only re-checkpoint the buffer_head if it is marked | |
892 | * dirty. If the buffer was added to the BJ_Forget list | |
f7f4bccb | 893 | * by jbd2_journal_forget, it may no longer be dirty and |
470decc6 DK |
894 | * there's no point in keeping a checkpoint record for |
895 | * it. */ | |
896 | ||
897 | /* A buffer which has been freed while still being | |
898 | * journaled by a previous transaction may end up still | |
899 | * being dirty here, but we want to avoid writing back | |
900 | * that buffer in the future now that the last use has | |
901 | * been committed. That's not only a performance gain, | |
902 | * it also stops aliasing problems if the buffer is left | |
903 | * behind for writeback and gets reallocated for another | |
904 | * use in a different page. */ | |
905 | if (buffer_freed(bh)) { | |
906 | clear_buffer_freed(bh); | |
907 | clear_buffer_jbddirty(bh); | |
908 | } | |
909 | ||
910 | if (buffer_jbddirty(bh)) { | |
911 | JBUFFER_TRACE(jh, "add to new checkpointing trans"); | |
f7f4bccb | 912 | __jbd2_journal_insert_checkpoint(jh, commit_transaction); |
7ad7445f HK |
913 | if (is_journal_aborted(journal)) |
914 | clear_buffer_jbddirty(bh); | |
470decc6 | 915 | JBUFFER_TRACE(jh, "refile for checkpoint writeback"); |
f7f4bccb | 916 | __jbd2_journal_refile_buffer(jh); |
470decc6 DK |
917 | jbd_unlock_bh_state(bh); |
918 | } else { | |
919 | J_ASSERT_BH(bh, !buffer_dirty(bh)); | |
920 | /* The buffer on BJ_Forget list and not jbddirty means | |
921 | * it has been freed by this transaction and hence it | |
922 | * could not have been reallocated until this | |
923 | * transaction has committed. *BUT* it could be | |
924 | * reallocated once we have written all the data to | |
925 | * disk and before we process the buffer on BJ_Forget | |
926 | * list. */ | |
927 | JBUFFER_TRACE(jh, "refile or unfile freed buffer"); | |
f7f4bccb | 928 | __jbd2_journal_refile_buffer(jh); |
470decc6 DK |
929 | if (!jh->b_transaction) { |
930 | jbd_unlock_bh_state(bh); | |
931 | /* needs a brelse */ | |
f7f4bccb | 932 | jbd2_journal_remove_journal_head(bh); |
470decc6 DK |
933 | release_buffer_page(bh); |
934 | } else | |
935 | jbd_unlock_bh_state(bh); | |
936 | } | |
937 | cond_resched_lock(&journal->j_list_lock); | |
938 | } | |
939 | spin_unlock(&journal->j_list_lock); | |
940 | /* | |
f5a7a6b0 JK |
941 | * This is a bit sleazy. We use j_list_lock to protect transition |
942 | * of a transaction into T_FINISHED state and calling | |
943 | * __jbd2_journal_drop_transaction(). Otherwise we could race with | |
944 | * other checkpointing code processing the transaction... | |
470decc6 DK |
945 | */ |
946 | spin_lock(&journal->j_state_lock); | |
947 | spin_lock(&journal->j_list_lock); | |
948 | /* | |
949 | * Now recheck if some buffers did not get attached to the transaction | |
950 | * while the lock was dropped... | |
951 | */ | |
952 | if (commit_transaction->t_forget) { | |
953 | spin_unlock(&journal->j_list_lock); | |
954 | spin_unlock(&journal->j_state_lock); | |
955 | goto restart_loop; | |
956 | } | |
957 | ||
958 | /* Done with this transaction! */ | |
959 | ||
87c89c23 | 960 | jbd_debug(3, "JBD: commit phase 7\n"); |
470decc6 DK |
961 | |
962 | J_ASSERT(commit_transaction->t_state == T_COMMIT); | |
963 | ||
8e85fb3f JL |
964 | commit_transaction->t_start = jiffies; |
965 | stats.u.run.rs_logging = jbd2_time_diff(stats.u.run.rs_logging, | |
966 | commit_transaction->t_start); | |
967 | ||
968 | /* | |
969 | * File the transaction for history | |
970 | */ | |
971 | stats.ts_type = JBD2_STATS_RUN; | |
972 | stats.ts_tid = commit_transaction->t_tid; | |
973 | stats.u.run.rs_handle_count = commit_transaction->t_handle_count; | |
974 | spin_lock(&journal->j_history_lock); | |
975 | memcpy(journal->j_history + journal->j_history_cur, &stats, | |
976 | sizeof(stats)); | |
977 | if (++journal->j_history_cur == journal->j_history_max) | |
978 | journal->j_history_cur = 0; | |
979 | ||
980 | /* | |
981 | * Calculate overall stats | |
982 | */ | |
983 | journal->j_stats.ts_tid++; | |
984 | journal->j_stats.u.run.rs_wait += stats.u.run.rs_wait; | |
985 | journal->j_stats.u.run.rs_running += stats.u.run.rs_running; | |
986 | journal->j_stats.u.run.rs_locked += stats.u.run.rs_locked; | |
987 | journal->j_stats.u.run.rs_flushing += stats.u.run.rs_flushing; | |
988 | journal->j_stats.u.run.rs_logging += stats.u.run.rs_logging; | |
989 | journal->j_stats.u.run.rs_handle_count += stats.u.run.rs_handle_count; | |
990 | journal->j_stats.u.run.rs_blocks += stats.u.run.rs_blocks; | |
991 | journal->j_stats.u.run.rs_blocks_logged += stats.u.run.rs_blocks_logged; | |
992 | spin_unlock(&journal->j_history_lock); | |
993 | ||
470decc6 DK |
994 | commit_transaction->t_state = T_FINISHED; |
995 | J_ASSERT(commit_transaction == journal->j_committing_transaction); | |
996 | journal->j_commit_sequence = commit_transaction->t_tid; | |
997 | journal->j_committing_transaction = NULL; | |
998 | spin_unlock(&journal->j_state_lock); | |
999 | ||
6c20ec85 TT |
1000 | if (journal->j_commit_callback) |
1001 | journal->j_commit_callback(journal, commit_transaction); | |
1002 | ||
f89b7795 JK |
1003 | if (commit_transaction->t_checkpoint_list == NULL && |
1004 | commit_transaction->t_checkpoint_io_list == NULL) { | |
f7f4bccb | 1005 | __jbd2_journal_drop_transaction(journal, commit_transaction); |
470decc6 DK |
1006 | } else { |
1007 | if (journal->j_checkpoint_transactions == NULL) { | |
1008 | journal->j_checkpoint_transactions = commit_transaction; | |
1009 | commit_transaction->t_cpnext = commit_transaction; | |
1010 | commit_transaction->t_cpprev = commit_transaction; | |
1011 | } else { | |
1012 | commit_transaction->t_cpnext = | |
1013 | journal->j_checkpoint_transactions; | |
1014 | commit_transaction->t_cpprev = | |
1015 | commit_transaction->t_cpnext->t_cpprev; | |
1016 | commit_transaction->t_cpnext->t_cpprev = | |
1017 | commit_transaction; | |
1018 | commit_transaction->t_cpprev->t_cpnext = | |
1019 | commit_transaction; | |
1020 | } | |
1021 | } | |
1022 | spin_unlock(&journal->j_list_lock); | |
1023 | ||
ede86cc4 | 1024 | trace_mark(jbd2_end_commit, "dev %s transaction %d head %d", |
6c20ec85 | 1025 | journal->j_devname, journal->j_commit_sequence, |
ede86cc4 | 1026 | journal->j_tail_sequence); |
470decc6 DK |
1027 | jbd_debug(1, "JBD: commit %d complete, head %d\n", |
1028 | journal->j_commit_sequence, journal->j_tail_sequence); | |
1029 | ||
1030 | wake_up(&journal->j_wait_done_commit); | |
1031 | } |