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Commit | Line | Data |
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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> |
470decc6 DK |
19 | #include <linux/errno.h> |
20 | #include <linux/slab.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/pagemap.h> | |
8e85fb3f | 23 | #include <linux/jiffies.h> |
818d276c | 24 | #include <linux/crc32.h> |
cd1aac32 AK |
25 | #include <linux/writeback.h> |
26 | #include <linux/backing-dev.h> | |
fd98496f | 27 | #include <linux/bio.h> |
0e3d2a63 | 28 | #include <linux/blkdev.h> |
879c5e6b | 29 | #include <trace/events/jbd2.h> |
470decc6 DK |
30 | |
31 | /* | |
32 | * Default IO end handler for temporary BJ_IO buffer_heads. | |
33 | */ | |
34 | static 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 | /* | |
87c89c23 JK |
45 | * 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. | |
470decc6 DK |
47 | * 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 | */ | |
58 | static 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 */ | |
529ae9aa | 73 | if (!trylock_page(page)) |
470decc6 DK |
74 | 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 | ||
83 | nope: | |
84 | __brelse(bh); | |
85 | } | |
86 | ||
818d276c GS |
87 | /* |
88 | * Done it all: now submit the commit record. We should have | |
470decc6 DK |
89 | * 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 | */ | |
818d276c GS |
95 | static int journal_submit_commit_record(journal_t *journal, |
96 | transaction_t *commit_transaction, | |
97 | struct buffer_head **cbh, | |
98 | __u32 crc32_sum) | |
470decc6 DK |
99 | { |
100 | struct journal_head *descriptor; | |
818d276c | 101 | struct commit_header *tmp; |
470decc6 | 102 | struct buffer_head *bh; |
818d276c | 103 | int ret; |
470decc6 | 104 | int barrier_done = 0; |
736603ab | 105 | struct timespec now = current_kernel_time(); |
470decc6 DK |
106 | |
107 | if (is_journal_aborted(journal)) | |
108 | return 0; | |
109 | ||
f7f4bccb | 110 | descriptor = jbd2_journal_get_descriptor_buffer(journal); |
470decc6 DK |
111 | if (!descriptor) |
112 | return 1; | |
113 | ||
114 | bh = jh2bh(descriptor); | |
115 | ||
818d276c GS |
116 | 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); | |
736603ab TT |
120 | tmp->h_commit_sec = cpu_to_be64(now.tv_sec); |
121 | tmp->h_commit_nsec = cpu_to_be32(now.tv_nsec); | |
818d276c GS |
122 | |
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); | |
470decc6 DK |
128 | } |
129 | ||
818d276c GS |
130 | JBUFFER_TRACE(descriptor, "submit commit block"); |
131 | lock_buffer(bh); | |
45a90bfd | 132 | clear_buffer_dirty(bh); |
818d276c GS |
133 | set_buffer_uptodate(bh); |
134 | bh->b_end_io = journal_end_buffer_io_sync; | |
135 | ||
136 | if (journal->j_flags & JBD2_BARRIER && | |
0e3d2a63 TT |
137 | !JBD2_HAS_INCOMPAT_FEATURE(journal, |
138 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { | |
470decc6 DK |
139 | set_buffer_ordered(bh); |
140 | barrier_done = 1; | |
141 | } | |
4194b1ea | 142 | ret = submit_bh(WRITE_SYNC_PLUG, bh); |
c4e35e07 DK |
143 | if (barrier_done) |
144 | clear_buffer_ordered(bh); | |
818d276c | 145 | |
470decc6 DK |
146 | /* 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) { | |
470decc6 | 152 | printk(KERN_WARNING |
cc937db7 ES |
153 | "JBD2: Disabling barriers on %s, " |
154 | "not supported by device\n", journal->j_devname); | |
470decc6 | 155 | spin_lock(&journal->j_state_lock); |
f7f4bccb | 156 | journal->j_flags &= ~JBD2_BARRIER; |
470decc6 DK |
157 | spin_unlock(&journal->j_state_lock); |
158 | ||
159 | /* And try again, without the barrier */ | |
034772b0 | 160 | lock_buffer(bh); |
470decc6 | 161 | set_buffer_uptodate(bh); |
45a90bfd | 162 | clear_buffer_dirty(bh); |
4194b1ea | 163 | ret = submit_bh(WRITE_SYNC_PLUG, bh); |
470decc6 | 164 | } |
818d276c GS |
165 | *cbh = bh; |
166 | return ret; | |
167 | } | |
168 | ||
169 | /* | |
170 | * This function along with journal_submit_commit_record | |
171 | * allows to write the commit record asynchronously. | |
172 | */ | |
fd98496f TT |
173 | static int journal_wait_on_commit_record(journal_t *journal, |
174 | struct buffer_head *bh) | |
818d276c GS |
175 | { |
176 | int ret = 0; | |
177 | ||
fd98496f | 178 | retry: |
818d276c GS |
179 | clear_buffer_dirty(bh); |
180 | wait_on_buffer(bh); | |
fd98496f TT |
181 | if (buffer_eopnotsupp(bh) && (journal->j_flags & JBD2_BARRIER)) { |
182 | printk(KERN_WARNING | |
cc937db7 ES |
183 | "JBD2: %s: disabling barries on %s - not supported " |
184 | "by device\n", __func__, journal->j_devname); | |
fd98496f TT |
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 | ||
4194b1ea | 194 | ret = submit_bh(WRITE_SYNC_PLUG, bh); |
fd98496f TT |
195 | if (ret) { |
196 | unlock_buffer(bh); | |
197 | return ret; | |
198 | } | |
199 | goto retry; | |
200 | } | |
470decc6 | 201 | |
818d276c GS |
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; | |
470decc6 DK |
208 | } |
209 | ||
cd1aac32 AK |
210 | /* |
211 | * 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 | */ | |
216 | static 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), | |
cd1aac32 AK |
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 | */ | |
879c5e6b | 256 | trace_jbd2_submit_inode_data(jinode->i_vfs_inode); |
cd1aac32 | 257 | err = journal_submit_inode_data_buffers(mapping); |
c851ed54 JK |
258 | if (!ret) |
259 | ret = err; | |
260 | spin_lock(&journal->j_list_lock); | |
261 | J_ASSERT(jinode->i_transaction == commit_transaction); | |
cc3e1bea | 262 | commit_transaction->t_flushed_data_blocks = 1; |
c851ed54 JK |
263 | 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 | */ | |
275 | static 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 | ||
cd1aac32 | 281 | /* For locking, see the comment in journal_submit_data_buffers() */ |
c851ed54 JK |
282 | 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); | |
e9e34f4e HK |
287 | if (err) { |
288 | /* | |
289 | * Because AS_EIO is cleared by | |
94004ed7 | 290 | * filemap_fdatawait_range(), set it again so |
e9e34f4e HK |
291 | * 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 | } | |
c851ed54 JK |
299 | 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 | ||
818d276c GS |
322 | static __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 | ||
336 | static void write_tag_block(int tag_bytes, journal_block_tag_t *tag, | |
18eba7aa | 337 | unsigned long long block) |
b517bea1 ZB |
338 | { |
339 | tag->t_blocknr = cpu_to_be32(block & (u32)~0); | |
cd02ff0b | 340 | if (tag_bytes > JBD2_TAG_SIZE32) |
b517bea1 ZB |
341 | tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1); |
342 | } | |
343 | ||
470decc6 | 344 | /* |
f7f4bccb | 345 | * jbd2_journal_commit_transaction |
470decc6 DK |
346 | * |
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 | */ | |
f7f4bccb | 350 | void jbd2_journal_commit_transaction(journal_t *journal) |
470decc6 | 351 | { |
8e85fb3f | 352 | struct transaction_stats_s stats; |
470decc6 DK |
353 | 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; | |
18eba7aa | 359 | unsigned long long blocknr; |
e07f7183 JB |
360 | ktime_t start_time; |
361 | u64 commit_time; | |
470decc6 DK |
362 | 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; | |
fb68407b | 368 | int i, to_free = 0; |
b517bea1 | 369 | int tag_bytes = journal_tag_bytes(journal); |
818d276c GS |
370 | struct buffer_head *cbh = NULL; /* For transactional checksums */ |
371 | __u32 crc32_sum = ~0; | |
7058548c | 372 | int write_op = WRITE; |
470decc6 DK |
373 | |
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 | ||
f7f4bccb MC |
385 | /* Do we need to erase the effects of a prior jbd2_journal_flush? */ |
386 | if (journal->j_flags & JBD2_FLUSHED) { | |
470decc6 | 387 | jbd_debug(3, "super block updated\n"); |
f7f4bccb | 388 | jbd2_journal_update_superblock(journal, 1); |
470decc6 DK |
389 | } 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 | ||
879c5e6b | 399 | trace_jbd2_start_commit(journal, commit_transaction); |
470decc6 DK |
400 | 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 | ||
4194b1ea JA |
406 | /* |
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 | */ | |
7058548c | 411 | if (commit_transaction->t_synchronous_commit) |
4194b1ea | 412 | write_op = WRITE_SYNC_PLUG; |
879c5e6b | 413 | trace_jbd2_commit_locking(journal, commit_transaction); |
bf699327 TT |
414 | 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); | |
8e85fb3f | 418 | |
470decc6 DK |
419 | 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 | |
f7f4bccb | 444 | * transactions, then it may try to do a jbd2_journal_restart() while |
470decc6 DK |
445 | * 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 | |
f7f4bccb | 452 | * that multiple jbd2_journal_get_write_access() calls to the same |
470decc6 DK |
453 | * 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 | /* | |
f7f4bccb | 459 | * A jbd2_journal_get_undo_access()+jbd2_journal_release_buffer() may |
470decc6 DK |
460 | * 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); | |
af1e76d6 | 466 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
467 | jh->b_committed_data = NULL; |
468 | jbd_unlock_bh_state(bh); | |
469 | } | |
f7f4bccb | 470 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
471 | } |
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); | |
f7f4bccb | 479 | __jbd2_journal_clean_checkpoint_list(journal); |
470decc6 DK |
480 | 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 | */ | |
f7f4bccb | 487 | jbd2_journal_switch_revoke_table(journal); |
470decc6 | 488 | |
879c5e6b | 489 | trace_jbd2_commit_flushing(journal, commit_transaction); |
bf699327 TT |
490 | stats.run.rs_flushing = jiffies; |
491 | stats.run.rs_locked = jbd2_time_diff(stats.run.rs_locked, | |
492 | stats.run.rs_flushing); | |
8e85fb3f | 493 | |
470decc6 DK |
494 | commit_transaction->t_state = T_FLUSH; |
495 | journal->j_committing_transaction = commit_transaction; | |
496 | journal->j_running_transaction = NULL; | |
e07f7183 | 497 | start_time = ktime_get(); |
470decc6 DK |
498 | 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 | ||
470decc6 DK |
504 | /* |
505 | * Now start flushing things to disk, in the order they appear | |
506 | * on the transaction lists. Data blocks go first. | |
507 | */ | |
cd1aac32 | 508 | err = journal_submit_data_buffers(journal, commit_transaction); |
470decc6 | 509 | if (err) |
a7fa2baf | 510 | jbd2_journal_abort(journal, err); |
470decc6 | 511 | |
67c457a8 TT |
512 | jbd2_journal_write_revoke_records(journal, commit_transaction, |
513 | write_op); | |
470decc6 DK |
514 | |
515 | jbd_debug(3, "JBD: commit phase 2\n"); | |
516 | ||
470decc6 DK |
517 | /* |
518 | * 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 | */ | |
02c471cb | 522 | spin_lock(&journal->j_state_lock); |
470decc6 | 523 | commit_transaction->t_state = T_COMMIT; |
02c471cb | 524 | spin_unlock(&journal->j_state_lock); |
470decc6 | 525 | |
879c5e6b | 526 | trace_jbd2_commit_logging(journal, commit_transaction); |
bf699327 TT |
527 | 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; | |
8e85fb3f | 532 | |
1dfc3220 JB |
533 | J_ASSERT(commit_transaction->t_nr_buffers <= |
534 | commit_transaction->t_outstanding_credits); | |
535 | ||
87c89c23 | 536 | err = 0; |
470decc6 DK |
537 | 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 | |
7ad7445f | 546 | release it. */ |
470decc6 DK |
547 | |
548 | if (is_journal_aborted(journal)) { | |
7ad7445f | 549 | clear_buffer_jbddirty(jh2bh(jh)); |
470decc6 | 550 | JBUFFER_TRACE(jh, "journal is aborting: refile"); |
e06c8227 JB |
551 | jbd2_buffer_abort_trigger(jh, |
552 | jh->b_frozen_data ? | |
553 | jh->b_frozen_triggers : | |
554 | jh->b_triggers); | |
f7f4bccb | 555 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
556 | /* 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 | ||
f7f4bccb | 575 | descriptor = jbd2_journal_get_descriptor_buffer(journal); |
470decc6 | 576 | if (!descriptor) { |
a7fa2baf | 577 | jbd2_journal_abort(journal, -EIO); |
470decc6 DK |
578 | 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]; | |
f7f4bccb MC |
585 | header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); |
586 | header->h_blocktype = cpu_to_be32(JBD2_DESCRIPTOR_BLOCK); | |
470decc6 DK |
587 | 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"); | |
f7f4bccb | 599 | jbd2_journal_file_buffer(descriptor, commit_transaction, |
470decc6 DK |
600 | BJ_LogCtl); |
601 | } | |
602 | ||
603 | /* Where is the buffer to be written? */ | |
604 | ||
f7f4bccb | 605 | err = jbd2_journal_next_log_block(journal, &blocknr); |
470decc6 DK |
606 | /* 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) { | |
a7fa2baf | 610 | jbd2_journal_abort(journal, err); |
470decc6 DK |
611 | 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 | |
f7f4bccb | 617 | * by jbd2_journal_next_log_block() also. |
470decc6 DK |
618 | */ |
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 | /* | |
f7f4bccb | 632 | * akpm: jbd2_journal_write_metadata_buffer() sets |
470decc6 DK |
633 | * 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"); | |
f7f4bccb | 638 | flags = jbd2_journal_write_metadata_buffer(commit_transaction, |
470decc6 | 639 | jh, &new_jh, blocknr); |
e6ec116b TT |
640 | if (flags < 0) { |
641 | jbd2_journal_abort(journal, flags); | |
642 | continue; | |
643 | } | |
470decc6 DK |
644 | 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) | |
f7f4bccb | 652 | tag_flag |= JBD2_FLAG_ESCAPE; |
470decc6 | 653 | if (!first_tag) |
f7f4bccb | 654 | tag_flag |= JBD2_FLAG_SAME_UUID; |
470decc6 DK |
655 | |
656 | tag = (journal_block_tag_t *) tagp; | |
b517bea1 | 657 | write_tag_block(tag_bytes, tag, jh2bh(jh)->b_blocknr); |
470decc6 | 658 | tag->t_flags = cpu_to_be32(tag_flag); |
b517bea1 ZB |
659 | tagp += tag_bytes; |
660 | space_left -= tag_bytes; | |
470decc6 DK |
661 | |
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 || | |
b517bea1 | 674 | space_left < tag_bytes + 16) { |
470decc6 DK |
675 | |
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 | ||
f7f4bccb | 682 | tag->t_flags |= cpu_to_be32(JBD2_FLAG_LAST_TAG); |
470decc6 DK |
683 | |
684 | start_journal_io: | |
685 | for (i = 0; i < bufs; i++) { | |
686 | struct buffer_head *bh = wbuf[i]; | |
818d276c GS |
687 | /* |
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 | ||
470decc6 DK |
696 | lock_buffer(bh); |
697 | clear_buffer_dirty(bh); | |
698 | set_buffer_uptodate(bh); | |
699 | bh->b_end_io = journal_end_buffer_io_sync; | |
7058548c | 700 | submit_bh(write_op, bh); |
470decc6 DK |
701 | } |
702 | cond_resched(); | |
bf699327 | 703 | stats.run.rs_blocks_logged += bufs; |
470decc6 DK |
704 | |
705 | /* Force a new descriptor to be generated next | |
706 | time round the loop. */ | |
707 | descriptor = NULL; | |
708 | bufs = 0; | |
709 | } | |
710 | } | |
711 | ||
cc3e1bea TT |
712 | /* |
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)) | |
fbd9b09a DM |
720 | blkdev_issue_flush(journal->j_fs_dev, GFP_KERNEL, NULL, |
721 | BLKDEV_IFL_WAIT); | |
818d276c | 722 | |
cc3e1bea | 723 | /* Done it all: now write the commit record asynchronously. */ |
818d276c | 724 | if (JBD2_HAS_INCOMPAT_FEATURE(journal, |
0e3d2a63 | 725 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { |
818d276c GS |
726 | err = journal_submit_commit_record(journal, commit_transaction, |
727 | &cbh, crc32_sum); | |
728 | if (err) | |
729 | __jbd2_journal_abort_hard(journal); | |
0e3d2a63 | 730 | if (journal->j_flags & JBD2_BARRIER) |
fbd9b09a DM |
731 | blkdev_issue_flush(journal->j_dev, GFP_KERNEL, NULL, |
732 | BLKDEV_IFL_WAIT); | |
818d276c GS |
733 | } |
734 | ||
c851ed54 | 735 | err = journal_finish_inode_data_buffers(journal, commit_transaction); |
e9e34f4e | 736 | if (err) { |
e9e34f4e HK |
737 | printk(KERN_WARNING |
738 | "JBD2: Detected IO errors while flushing file data " | |
05496769 | 739 | "on %s\n", journal->j_devname); |
5bf5683a HK |
740 | if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR) |
741 | jbd2_journal_abort(journal, err); | |
e9e34f4e HK |
742 | err = 0; |
743 | } | |
c851ed54 | 744 | |
470decc6 DK |
745 | /* 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 | ||
87c89c23 | 756 | jbd_debug(3, "JBD: commit phase 3\n"); |
470decc6 DK |
757 | |
758 | /* | |
759 | * akpm: these are BJ_IO, and j_list_lock is not needed. | |
760 | * See __journal_try_to_free_buffer. | |
761 | */ | |
762 | wait_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"); | |
f7f4bccb | 781 | jbd2_journal_unfile_buffer(journal, jh); |
470decc6 DK |
782 | |
783 | /* | |
784 | * ->t_iobuf_list should contain only dummy buffer_heads | |
f7f4bccb | 785 | * which were created by jbd2_journal_write_metadata_buffer(). |
470decc6 DK |
786 | */ |
787 | BUFFER_TRACE(bh, "dumping temporary bh"); | |
f7f4bccb | 788 | jbd2_journal_put_journal_head(jh); |
470decc6 DK |
789 | __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"); | |
f7f4bccb | 805 | jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget); |
470decc6 DK |
806 | /* 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 | ||
87c89c23 | 815 | jbd_debug(3, "JBD: commit phase 4\n"); |
470decc6 DK |
816 | |
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); | |
f7f4bccb MC |
836 | jbd2_journal_unfile_buffer(journal, jh); |
837 | jbd2_journal_put_journal_head(jh); | |
470decc6 DK |
838 | __brelse(bh); /* One for getblk */ |
839 | /* AKPM: bforget here */ | |
840 | } | |
841 | ||
77e841de HK |
842 | if (err) |
843 | jbd2_journal_abort(journal, err); | |
844 | ||
87c89c23 | 845 | jbd_debug(3, "JBD: commit phase 5\n"); |
470decc6 | 846 | |
818d276c | 847 | if (!JBD2_HAS_INCOMPAT_FEATURE(journal, |
0e3d2a63 | 848 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { |
818d276c GS |
849 | err = journal_submit_commit_record(journal, commit_transaction, |
850 | &cbh, crc32_sum); | |
851 | if (err) | |
852 | __jbd2_journal_abort_hard(journal); | |
853 | } | |
b048d846 | 854 | if (!err && !is_journal_aborted(journal)) |
fd98496f | 855 | err = journal_wait_on_commit_record(journal, cbh); |
470decc6 DK |
856 | |
857 | if (err) | |
a7fa2baf | 858 | jbd2_journal_abort(journal, err); |
470decc6 DK |
859 | |
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 | ||
87c89c23 | 865 | jbd_debug(3, "JBD: commit phase 6\n"); |
470decc6 | 866 | |
c851ed54 | 867 | J_ASSERT(list_empty(&commit_transaction->t_inode_list)); |
470decc6 DK |
868 | 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 | ||
874 | restart_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); | |
23e2af35 | 888 | J_ASSERT_JH(jh, jh->b_transaction == commit_transaction); |
470decc6 DK |
889 | |
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. | |
e06c8227 JB |
899 | * |
900 | * We also know that the frozen data has already fired | |
901 | * its triggers if they exist, so we can clear that too. | |
470decc6 DK |
902 | */ |
903 | if (jh->b_committed_data) { | |
af1e76d6 | 904 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
905 | 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; | |
e06c8227 | 909 | jh->b_frozen_triggers = NULL; |
470decc6 DK |
910 | } |
911 | } else if (jh->b_frozen_data) { | |
af1e76d6 | 912 | jbd2_free(jh->b_frozen_data, bh->b_size); |
470decc6 | 913 | jh->b_frozen_data = NULL; |
e06c8227 | 914 | jh->b_frozen_triggers = NULL; |
470decc6 DK |
915 | } |
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"); | |
8e85fb3f | 921 | cp_transaction->t_chp_stats.cs_dropped++; |
f7f4bccb | 922 | __jbd2_journal_remove_checkpoint(jh); |
470decc6 DK |
923 | } |
924 | ||
925 | /* Only re-checkpoint the buffer_head if it is marked | |
926 | * dirty. If the buffer was added to the BJ_Forget list | |
f7f4bccb | 927 | * by jbd2_journal_forget, it may no longer be dirty and |
470decc6 DK |
928 | * 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 | |
ba869023 | 934 | * 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 | |
470decc6 | 938 | * use in a different page. */ |
ba869023 | 939 | if (buffer_freed(bh) && !jh->b_next_transaction) { |
470decc6 DK |
940 | 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"); | |
f7f4bccb | 946 | __jbd2_journal_insert_checkpoint(jh, commit_transaction); |
7ad7445f HK |
947 | if (is_journal_aborted(journal)) |
948 | clear_buffer_jbddirty(bh); | |
470decc6 | 949 | JBUFFER_TRACE(jh, "refile for checkpoint writeback"); |
f7f4bccb | 950 | __jbd2_journal_refile_buffer(jh); |
470decc6 DK |
951 | 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"); | |
f7f4bccb | 962 | __jbd2_journal_refile_buffer(jh); |
470decc6 DK |
963 | if (!jh->b_transaction) { |
964 | jbd_unlock_bh_state(bh); | |
965 | /* needs a brelse */ | |
f7f4bccb | 966 | jbd2_journal_remove_journal_head(bh); |
470decc6 DK |
967 | 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 | /* | |
f5a7a6b0 JK |
975 | * 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... | |
470decc6 DK |
979 | */ |
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 | ||
87c89c23 | 994 | jbd_debug(3, "JBD: commit phase 7\n"); |
470decc6 DK |
995 | |
996 | J_ASSERT(commit_transaction->t_state == T_COMMIT); | |
997 | ||
8e85fb3f | 998 | commit_transaction->t_start = jiffies; |
bf699327 TT |
999 | stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging, |
1000 | commit_transaction->t_start); | |
8e85fb3f JL |
1001 | |
1002 | /* | |
bf699327 | 1003 | * File the transaction statistics |
8e85fb3f | 1004 | */ |
8e85fb3f | 1005 | stats.ts_tid = commit_transaction->t_tid; |
bf699327 TT |
1006 | 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); | |
8e85fb3f JL |
1009 | |
1010 | /* | |
1011 | * Calculate overall stats | |
1012 | */ | |
bf699327 | 1013 | spin_lock(&journal->j_history_lock); |
8e85fb3f | 1014 | journal->j_stats.ts_tid++; |
bf699327 TT |
1015 | 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; | |
8e85fb3f JL |
1023 | spin_unlock(&journal->j_history_lock); |
1024 | ||
470decc6 DK |
1025 | 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; | |
e07f7183 | 1029 | commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time)); |
470decc6 | 1030 | |
e07f7183 JB |
1031 | /* |
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; | |
470decc6 | 1040 | spin_unlock(&journal->j_state_lock); |
6c20ec85 | 1041 | |
f89b7795 JK |
1042 | if (commit_transaction->t_checkpoint_list == NULL && |
1043 | commit_transaction->t_checkpoint_io_list == NULL) { | |
f7f4bccb | 1044 | __jbd2_journal_drop_transaction(journal, commit_transaction); |
fb68407b | 1045 | to_free = 1; |
470decc6 DK |
1046 | } 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 | ||
fb68407b AK |
1064 | if (journal->j_commit_callback) |
1065 | journal->j_commit_callback(journal, commit_transaction); | |
1066 | ||
879c5e6b | 1067 | trace_jbd2_end_commit(journal, commit_transaction); |
470decc6 DK |
1068 | jbd_debug(1, "JBD: commit %d complete, head %d\n", |
1069 | journal->j_commit_sequence, journal->j_tail_sequence); | |
fb68407b AK |
1070 | if (to_free) |
1071 | kfree(commit_transaction); | |
470decc6 DK |
1072 | |
1073 | wake_up(&journal->j_wait_done_commit); | |
1074 | } |