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> |
39e3ac25 | 29 | #include <linux/bitops.h> |
879c5e6b | 30 | #include <trace/events/jbd2.h> |
39e3ac25 | 31 | #include <asm/system.h> |
470decc6 DK |
32 | |
33 | /* | |
34 | * Default IO end handler for temporary BJ_IO buffer_heads. | |
35 | */ | |
36 | static void journal_end_buffer_io_sync(struct buffer_head *bh, int uptodate) | |
37 | { | |
38 | BUFFER_TRACE(bh, ""); | |
39 | if (uptodate) | |
40 | set_buffer_uptodate(bh); | |
41 | else | |
42 | clear_buffer_uptodate(bh); | |
43 | unlock_buffer(bh); | |
44 | } | |
45 | ||
46 | /* | |
87c89c23 JK |
47 | * When an ext4 file is truncated, it is possible that some pages are not |
48 | * successfully freed, because they are attached to a committing transaction. | |
470decc6 DK |
49 | * After the transaction commits, these pages are left on the LRU, with no |
50 | * ->mapping, and with attached buffers. These pages are trivially reclaimable | |
51 | * by the VM, but their apparent absence upsets the VM accounting, and it makes | |
52 | * the numbers in /proc/meminfo look odd. | |
53 | * | |
54 | * So here, we have a buffer which has just come off the forget list. Look to | |
55 | * see if we can strip all buffers from the backing page. | |
56 | * | |
57 | * Called under lock_journal(), and possibly under journal_datalist_lock. The | |
58 | * caller provided us with a ref against the buffer, and we drop that here. | |
59 | */ | |
60 | static void release_buffer_page(struct buffer_head *bh) | |
61 | { | |
62 | struct page *page; | |
63 | ||
64 | if (buffer_dirty(bh)) | |
65 | goto nope; | |
66 | if (atomic_read(&bh->b_count) != 1) | |
67 | goto nope; | |
68 | page = bh->b_page; | |
69 | if (!page) | |
70 | goto nope; | |
71 | if (page->mapping) | |
72 | goto nope; | |
73 | ||
74 | /* OK, it's a truncated page */ | |
529ae9aa | 75 | if (!trylock_page(page)) |
470decc6 DK |
76 | goto nope; |
77 | ||
78 | page_cache_get(page); | |
79 | __brelse(bh); | |
80 | try_to_free_buffers(page); | |
81 | unlock_page(page); | |
82 | page_cache_release(page); | |
83 | return; | |
84 | ||
85 | nope: | |
86 | __brelse(bh); | |
87 | } | |
88 | ||
818d276c GS |
89 | /* |
90 | * Done it all: now submit the commit record. We should have | |
470decc6 DK |
91 | * cleaned up our previous buffers by now, so if we are in abort |
92 | * mode we can now just skip the rest of the journal write | |
93 | * entirely. | |
94 | * | |
95 | * Returns 1 if the journal needs to be aborted or 0 on success | |
96 | */ | |
818d276c GS |
97 | static int journal_submit_commit_record(journal_t *journal, |
98 | transaction_t *commit_transaction, | |
99 | struct buffer_head **cbh, | |
100 | __u32 crc32_sum) | |
470decc6 DK |
101 | { |
102 | struct journal_head *descriptor; | |
818d276c | 103 | struct commit_header *tmp; |
470decc6 | 104 | struct buffer_head *bh; |
818d276c | 105 | int ret; |
736603ab | 106 | struct timespec now = current_kernel_time(); |
470decc6 DK |
107 | |
108 | if (is_journal_aborted(journal)) | |
109 | return 0; | |
110 | ||
f7f4bccb | 111 | descriptor = jbd2_journal_get_descriptor_buffer(journal); |
470decc6 DK |
112 | if (!descriptor) |
113 | return 1; | |
114 | ||
115 | bh = jh2bh(descriptor); | |
116 | ||
818d276c GS |
117 | tmp = (struct commit_header *)bh->b_data; |
118 | tmp->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); | |
119 | tmp->h_blocktype = cpu_to_be32(JBD2_COMMIT_BLOCK); | |
120 | tmp->h_sequence = cpu_to_be32(commit_transaction->t_tid); | |
736603ab TT |
121 | tmp->h_commit_sec = cpu_to_be64(now.tv_sec); |
122 | tmp->h_commit_nsec = cpu_to_be32(now.tv_nsec); | |
818d276c GS |
123 | |
124 | if (JBD2_HAS_COMPAT_FEATURE(journal, | |
125 | JBD2_FEATURE_COMPAT_CHECKSUM)) { | |
126 | tmp->h_chksum_type = JBD2_CRC32_CHKSUM; | |
127 | tmp->h_chksum_size = JBD2_CRC32_CHKSUM_SIZE; | |
128 | tmp->h_chksum[0] = cpu_to_be32(crc32_sum); | |
470decc6 DK |
129 | } |
130 | ||
818d276c GS |
131 | JBUFFER_TRACE(descriptor, "submit commit block"); |
132 | lock_buffer(bh); | |
45a90bfd | 133 | clear_buffer_dirty(bh); |
818d276c GS |
134 | set_buffer_uptodate(bh); |
135 | bh->b_end_io = journal_end_buffer_io_sync; | |
136 | ||
137 | if (journal->j_flags & JBD2_BARRIER && | |
0e3d2a63 TT |
138 | !JBD2_HAS_INCOMPAT_FEATURE(journal, |
139 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { | |
87e99511 CH |
140 | ret = submit_bh(WRITE_SYNC_PLUG | WRITE_BARRIER, bh); |
141 | if (ret == -EOPNOTSUPP) { | |
142 | printk(KERN_WARNING | |
143 | "JBD2: Disabling barriers on %s, " | |
144 | "not supported by device\n", journal->j_devname); | |
145 | write_lock(&journal->j_state_lock); | |
146 | journal->j_flags &= ~JBD2_BARRIER; | |
147 | write_unlock(&journal->j_state_lock); | |
148 | ||
149 | /* And try again, without the barrier */ | |
150 | lock_buffer(bh); | |
151 | set_buffer_uptodate(bh); | |
152 | clear_buffer_dirty(bh); | |
153 | ret = submit_bh(WRITE_SYNC_PLUG, bh); | |
154 | } | |
155 | } else { | |
4194b1ea | 156 | ret = submit_bh(WRITE_SYNC_PLUG, bh); |
470decc6 | 157 | } |
818d276c GS |
158 | *cbh = bh; |
159 | return ret; | |
160 | } | |
161 | ||
162 | /* | |
163 | * This function along with journal_submit_commit_record | |
164 | * allows to write the commit record asynchronously. | |
165 | */ | |
fd98496f TT |
166 | static int journal_wait_on_commit_record(journal_t *journal, |
167 | struct buffer_head *bh) | |
818d276c GS |
168 | { |
169 | int ret = 0; | |
170 | ||
fd98496f | 171 | retry: |
818d276c GS |
172 | clear_buffer_dirty(bh); |
173 | wait_on_buffer(bh); | |
fd98496f TT |
174 | if (buffer_eopnotsupp(bh) && (journal->j_flags & JBD2_BARRIER)) { |
175 | printk(KERN_WARNING | |
cc937db7 ES |
176 | "JBD2: %s: disabling barries on %s - not supported " |
177 | "by device\n", __func__, journal->j_devname); | |
a931da6a | 178 | write_lock(&journal->j_state_lock); |
fd98496f | 179 | journal->j_flags &= ~JBD2_BARRIER; |
a931da6a | 180 | write_unlock(&journal->j_state_lock); |
fd98496f TT |
181 | |
182 | lock_buffer(bh); | |
183 | clear_buffer_dirty(bh); | |
184 | set_buffer_uptodate(bh); | |
185 | bh->b_end_io = journal_end_buffer_io_sync; | |
186 | ||
4194b1ea | 187 | ret = submit_bh(WRITE_SYNC_PLUG, bh); |
fd98496f TT |
188 | if (ret) { |
189 | unlock_buffer(bh); | |
190 | return ret; | |
191 | } | |
192 | goto retry; | |
193 | } | |
470decc6 | 194 | |
818d276c GS |
195 | if (unlikely(!buffer_uptodate(bh))) |
196 | ret = -EIO; | |
197 | put_bh(bh); /* One for getblk() */ | |
198 | jbd2_journal_put_journal_head(bh2jh(bh)); | |
199 | ||
200 | return ret; | |
470decc6 DK |
201 | } |
202 | ||
cd1aac32 AK |
203 | /* |
204 | * write the filemap data using writepage() address_space_operations. | |
205 | * We don't do block allocation here even for delalloc. We don't | |
206 | * use writepages() because with dealyed allocation we may be doing | |
207 | * block allocation in writepages(). | |
208 | */ | |
209 | static int journal_submit_inode_data_buffers(struct address_space *mapping) | |
210 | { | |
211 | int ret; | |
212 | struct writeback_control wbc = { | |
213 | .sync_mode = WB_SYNC_ALL, | |
214 | .nr_to_write = mapping->nrpages * 2, | |
215 | .range_start = 0, | |
216 | .range_end = i_size_read(mapping->host), | |
cd1aac32 AK |
217 | }; |
218 | ||
219 | ret = generic_writepages(mapping, &wbc); | |
220 | return ret; | |
221 | } | |
222 | ||
c851ed54 JK |
223 | /* |
224 | * Submit all the data buffers of inode associated with the transaction to | |
225 | * disk. | |
226 | * | |
227 | * We are in a committing transaction. Therefore no new inode can be added to | |
228 | * our inode list. We use JI_COMMIT_RUNNING flag to protect inode we currently | |
229 | * operate on from being released while we write out pages. | |
230 | */ | |
cd1aac32 | 231 | static int journal_submit_data_buffers(journal_t *journal, |
c851ed54 JK |
232 | transaction_t *commit_transaction) |
233 | { | |
234 | struct jbd2_inode *jinode; | |
235 | int err, ret = 0; | |
236 | struct address_space *mapping; | |
237 | ||
238 | spin_lock(&journal->j_list_lock); | |
239 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { | |
240 | mapping = jinode->i_vfs_inode->i_mapping; | |
39e3ac25 | 241 | set_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
c851ed54 | 242 | spin_unlock(&journal->j_list_lock); |
cd1aac32 AK |
243 | /* |
244 | * submit the inode data buffers. We use writepage | |
245 | * instead of writepages. Because writepages can do | |
246 | * block allocation with delalloc. We need to write | |
247 | * only allocated blocks here. | |
248 | */ | |
879c5e6b | 249 | trace_jbd2_submit_inode_data(jinode->i_vfs_inode); |
cd1aac32 | 250 | err = journal_submit_inode_data_buffers(mapping); |
c851ed54 JK |
251 | if (!ret) |
252 | ret = err; | |
253 | spin_lock(&journal->j_list_lock); | |
254 | J_ASSERT(jinode->i_transaction == commit_transaction); | |
cc3e1bea | 255 | commit_transaction->t_flushed_data_blocks = 1; |
39e3ac25 BK |
256 | clear_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
257 | smp_mb__after_clear_bit(); | |
c851ed54 JK |
258 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); |
259 | } | |
260 | spin_unlock(&journal->j_list_lock); | |
261 | return ret; | |
262 | } | |
263 | ||
264 | /* | |
265 | * Wait for data submitted for writeout, refile inodes to proper | |
266 | * transaction if needed. | |
267 | * | |
268 | */ | |
269 | static int journal_finish_inode_data_buffers(journal_t *journal, | |
270 | transaction_t *commit_transaction) | |
271 | { | |
272 | struct jbd2_inode *jinode, *next_i; | |
273 | int err, ret = 0; | |
274 | ||
cd1aac32 | 275 | /* For locking, see the comment in journal_submit_data_buffers() */ |
c851ed54 JK |
276 | spin_lock(&journal->j_list_lock); |
277 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { | |
39e3ac25 | 278 | set_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
c851ed54 JK |
279 | spin_unlock(&journal->j_list_lock); |
280 | err = filemap_fdatawait(jinode->i_vfs_inode->i_mapping); | |
e9e34f4e HK |
281 | if (err) { |
282 | /* | |
283 | * Because AS_EIO is cleared by | |
94004ed7 | 284 | * filemap_fdatawait_range(), set it again so |
e9e34f4e HK |
285 | * that user process can get -EIO from fsync(). |
286 | */ | |
287 | set_bit(AS_EIO, | |
288 | &jinode->i_vfs_inode->i_mapping->flags); | |
289 | ||
290 | if (!ret) | |
291 | ret = err; | |
292 | } | |
c851ed54 | 293 | spin_lock(&journal->j_list_lock); |
39e3ac25 BK |
294 | clear_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
295 | smp_mb__after_clear_bit(); | |
c851ed54 JK |
296 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); |
297 | } | |
298 | ||
299 | /* Now refile inode to proper lists */ | |
300 | list_for_each_entry_safe(jinode, next_i, | |
301 | &commit_transaction->t_inode_list, i_list) { | |
302 | list_del(&jinode->i_list); | |
303 | if (jinode->i_next_transaction) { | |
304 | jinode->i_transaction = jinode->i_next_transaction; | |
305 | jinode->i_next_transaction = NULL; | |
306 | list_add(&jinode->i_list, | |
307 | &jinode->i_transaction->t_inode_list); | |
308 | } else { | |
309 | jinode->i_transaction = NULL; | |
310 | } | |
311 | } | |
312 | spin_unlock(&journal->j_list_lock); | |
313 | ||
314 | return ret; | |
315 | } | |
316 | ||
818d276c GS |
317 | static __u32 jbd2_checksum_data(__u32 crc32_sum, struct buffer_head *bh) |
318 | { | |
319 | struct page *page = bh->b_page; | |
320 | char *addr; | |
321 | __u32 checksum; | |
322 | ||
323 | addr = kmap_atomic(page, KM_USER0); | |
324 | checksum = crc32_be(crc32_sum, | |
325 | (void *)(addr + offset_in_page(bh->b_data)), bh->b_size); | |
326 | kunmap_atomic(addr, KM_USER0); | |
327 | ||
328 | return checksum; | |
329 | } | |
330 | ||
331 | static void write_tag_block(int tag_bytes, journal_block_tag_t *tag, | |
18eba7aa | 332 | unsigned long long block) |
b517bea1 ZB |
333 | { |
334 | tag->t_blocknr = cpu_to_be32(block & (u32)~0); | |
cd02ff0b | 335 | if (tag_bytes > JBD2_TAG_SIZE32) |
b517bea1 ZB |
336 | tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1); |
337 | } | |
338 | ||
470decc6 | 339 | /* |
f7f4bccb | 340 | * jbd2_journal_commit_transaction |
470decc6 DK |
341 | * |
342 | * The primary function for committing a transaction to the log. This | |
343 | * function is called by the journal thread to begin a complete commit. | |
344 | */ | |
f7f4bccb | 345 | void jbd2_journal_commit_transaction(journal_t *journal) |
470decc6 | 346 | { |
8e85fb3f | 347 | struct transaction_stats_s stats; |
470decc6 DK |
348 | transaction_t *commit_transaction; |
349 | struct journal_head *jh, *new_jh, *descriptor; | |
350 | struct buffer_head **wbuf = journal->j_wbuf; | |
351 | int bufs; | |
352 | int flags; | |
353 | int err; | |
18eba7aa | 354 | unsigned long long blocknr; |
e07f7183 JB |
355 | ktime_t start_time; |
356 | u64 commit_time; | |
470decc6 DK |
357 | char *tagp = NULL; |
358 | journal_header_t *header; | |
359 | journal_block_tag_t *tag = NULL; | |
360 | int space_left = 0; | |
361 | int first_tag = 0; | |
362 | int tag_flag; | |
fb68407b | 363 | int i, to_free = 0; |
b517bea1 | 364 | int tag_bytes = journal_tag_bytes(journal); |
818d276c GS |
365 | struct buffer_head *cbh = NULL; /* For transactional checksums */ |
366 | __u32 crc32_sum = ~0; | |
7058548c | 367 | int write_op = WRITE; |
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 | ||
879c5e6b | 394 | trace_jbd2_start_commit(journal, commit_transaction); |
470decc6 DK |
395 | jbd_debug(1, "JBD: starting commit of transaction %d\n", |
396 | commit_transaction->t_tid); | |
397 | ||
a931da6a | 398 | write_lock(&journal->j_state_lock); |
470decc6 DK |
399 | commit_transaction->t_state = T_LOCKED; |
400 | ||
4194b1ea JA |
401 | /* |
402 | * Use plugged writes here, since we want to submit several before | |
403 | * we unplug the device. We don't do explicit unplugging in here, | |
404 | * instead we rely on sync_buffer() doing the unplug for us. | |
405 | */ | |
7058548c | 406 | if (commit_transaction->t_synchronous_commit) |
4194b1ea | 407 | write_op = WRITE_SYNC_PLUG; |
879c5e6b | 408 | trace_jbd2_commit_locking(journal, commit_transaction); |
bf699327 TT |
409 | stats.run.rs_wait = commit_transaction->t_max_wait; |
410 | stats.run.rs_locked = jiffies; | |
411 | stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start, | |
412 | stats.run.rs_locked); | |
8e85fb3f | 413 | |
470decc6 | 414 | spin_lock(&commit_transaction->t_handle_lock); |
a51dca9c | 415 | while (atomic_read(&commit_transaction->t_updates)) { |
470decc6 DK |
416 | DEFINE_WAIT(wait); |
417 | ||
418 | prepare_to_wait(&journal->j_wait_updates, &wait, | |
419 | TASK_UNINTERRUPTIBLE); | |
a51dca9c | 420 | if (atomic_read(&commit_transaction->t_updates)) { |
470decc6 | 421 | spin_unlock(&commit_transaction->t_handle_lock); |
a931da6a | 422 | write_unlock(&journal->j_state_lock); |
470decc6 | 423 | schedule(); |
a931da6a | 424 | write_lock(&journal->j_state_lock); |
470decc6 DK |
425 | spin_lock(&commit_transaction->t_handle_lock); |
426 | } | |
427 | finish_wait(&journal->j_wait_updates, &wait); | |
428 | } | |
429 | spin_unlock(&commit_transaction->t_handle_lock); | |
430 | ||
a51dca9c | 431 | J_ASSERT (atomic_read(&commit_transaction->t_outstanding_credits) <= |
470decc6 DK |
432 | journal->j_max_transaction_buffers); |
433 | ||
434 | /* | |
435 | * First thing we are allowed to do is to discard any remaining | |
436 | * BJ_Reserved buffers. Note, it is _not_ permissible to assume | |
437 | * that there are no such buffers: if a large filesystem | |
438 | * operation like a truncate needs to split itself over multiple | |
f7f4bccb | 439 | * transactions, then it may try to do a jbd2_journal_restart() while |
470decc6 DK |
440 | * there are still BJ_Reserved buffers outstanding. These must |
441 | * be released cleanly from the current transaction. | |
442 | * | |
443 | * In this case, the filesystem must still reserve write access | |
444 | * again before modifying the buffer in the new transaction, but | |
445 | * we do not require it to remember exactly which old buffers it | |
446 | * has reserved. This is consistent with the existing behaviour | |
f7f4bccb | 447 | * that multiple jbd2_journal_get_write_access() calls to the same |
470decc6 DK |
448 | * buffer are perfectly permissable. |
449 | */ | |
450 | while (commit_transaction->t_reserved_list) { | |
451 | jh = commit_transaction->t_reserved_list; | |
452 | JBUFFER_TRACE(jh, "reserved, unused: refile"); | |
453 | /* | |
f7f4bccb | 454 | * A jbd2_journal_get_undo_access()+jbd2_journal_release_buffer() may |
470decc6 DK |
455 | * leave undo-committed data. |
456 | */ | |
457 | if (jh->b_committed_data) { | |
458 | struct buffer_head *bh = jh2bh(jh); | |
459 | ||
460 | jbd_lock_bh_state(bh); | |
af1e76d6 | 461 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
462 | jh->b_committed_data = NULL; |
463 | jbd_unlock_bh_state(bh); | |
464 | } | |
f7f4bccb | 465 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
466 | } |
467 | ||
468 | /* | |
469 | * Now try to drop any written-back buffers from the journal's | |
470 | * checkpoint lists. We do this *before* commit because it potentially | |
471 | * frees some memory | |
472 | */ | |
473 | spin_lock(&journal->j_list_lock); | |
f7f4bccb | 474 | __jbd2_journal_clean_checkpoint_list(journal); |
470decc6 DK |
475 | spin_unlock(&journal->j_list_lock); |
476 | ||
477 | jbd_debug (3, "JBD: commit phase 1\n"); | |
478 | ||
479 | /* | |
480 | * Switch to a new revoke table. | |
481 | */ | |
f7f4bccb | 482 | jbd2_journal_switch_revoke_table(journal); |
470decc6 | 483 | |
879c5e6b | 484 | trace_jbd2_commit_flushing(journal, commit_transaction); |
bf699327 TT |
485 | stats.run.rs_flushing = jiffies; |
486 | stats.run.rs_locked = jbd2_time_diff(stats.run.rs_locked, | |
487 | stats.run.rs_flushing); | |
8e85fb3f | 488 | |
470decc6 DK |
489 | commit_transaction->t_state = T_FLUSH; |
490 | journal->j_committing_transaction = commit_transaction; | |
491 | journal->j_running_transaction = NULL; | |
e07f7183 | 492 | start_time = ktime_get(); |
470decc6 DK |
493 | commit_transaction->t_log_start = journal->j_head; |
494 | wake_up(&journal->j_wait_transaction_locked); | |
a931da6a | 495 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
496 | |
497 | jbd_debug (3, "JBD: commit phase 2\n"); | |
498 | ||
470decc6 DK |
499 | /* |
500 | * Now start flushing things to disk, in the order they appear | |
501 | * on the transaction lists. Data blocks go first. | |
502 | */ | |
cd1aac32 | 503 | err = journal_submit_data_buffers(journal, commit_transaction); |
470decc6 | 504 | if (err) |
a7fa2baf | 505 | jbd2_journal_abort(journal, err); |
470decc6 | 506 | |
67c457a8 TT |
507 | jbd2_journal_write_revoke_records(journal, commit_transaction, |
508 | write_op); | |
470decc6 DK |
509 | |
510 | jbd_debug(3, "JBD: commit phase 2\n"); | |
511 | ||
470decc6 DK |
512 | /* |
513 | * Way to go: we have now written out all of the data for a | |
514 | * transaction! Now comes the tricky part: we need to write out | |
515 | * metadata. Loop over the transaction's entire buffer list: | |
516 | */ | |
a931da6a | 517 | write_lock(&journal->j_state_lock); |
470decc6 | 518 | commit_transaction->t_state = T_COMMIT; |
a931da6a | 519 | write_unlock(&journal->j_state_lock); |
470decc6 | 520 | |
879c5e6b | 521 | trace_jbd2_commit_logging(journal, commit_transaction); |
bf699327 TT |
522 | stats.run.rs_logging = jiffies; |
523 | stats.run.rs_flushing = jbd2_time_diff(stats.run.rs_flushing, | |
524 | stats.run.rs_logging); | |
a51dca9c TT |
525 | stats.run.rs_blocks = |
526 | atomic_read(&commit_transaction->t_outstanding_credits); | |
bf699327 | 527 | stats.run.rs_blocks_logged = 0; |
8e85fb3f | 528 | |
1dfc3220 | 529 | J_ASSERT(commit_transaction->t_nr_buffers <= |
a51dca9c | 530 | atomic_read(&commit_transaction->t_outstanding_credits)); |
1dfc3220 | 531 | |
87c89c23 | 532 | err = 0; |
470decc6 DK |
533 | descriptor = NULL; |
534 | bufs = 0; | |
535 | while (commit_transaction->t_buffers) { | |
536 | ||
537 | /* Find the next buffer to be journaled... */ | |
538 | ||
539 | jh = commit_transaction->t_buffers; | |
540 | ||
541 | /* If we're in abort mode, we just un-journal the buffer and | |
7ad7445f | 542 | release it. */ |
470decc6 DK |
543 | |
544 | if (is_journal_aborted(journal)) { | |
7ad7445f | 545 | clear_buffer_jbddirty(jh2bh(jh)); |
470decc6 | 546 | JBUFFER_TRACE(jh, "journal is aborting: refile"); |
e06c8227 JB |
547 | jbd2_buffer_abort_trigger(jh, |
548 | jh->b_frozen_data ? | |
549 | jh->b_frozen_triggers : | |
550 | jh->b_triggers); | |
f7f4bccb | 551 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
552 | /* If that was the last one, we need to clean up |
553 | * any descriptor buffers which may have been | |
554 | * already allocated, even if we are now | |
555 | * aborting. */ | |
556 | if (!commit_transaction->t_buffers) | |
557 | goto start_journal_io; | |
558 | continue; | |
559 | } | |
560 | ||
561 | /* Make sure we have a descriptor block in which to | |
562 | record the metadata buffer. */ | |
563 | ||
564 | if (!descriptor) { | |
565 | struct buffer_head *bh; | |
566 | ||
567 | J_ASSERT (bufs == 0); | |
568 | ||
569 | jbd_debug(4, "JBD: get descriptor\n"); | |
570 | ||
f7f4bccb | 571 | descriptor = jbd2_journal_get_descriptor_buffer(journal); |
470decc6 | 572 | if (!descriptor) { |
a7fa2baf | 573 | jbd2_journal_abort(journal, -EIO); |
470decc6 DK |
574 | continue; |
575 | } | |
576 | ||
577 | bh = jh2bh(descriptor); | |
578 | jbd_debug(4, "JBD: got buffer %llu (%p)\n", | |
579 | (unsigned long long)bh->b_blocknr, bh->b_data); | |
580 | header = (journal_header_t *)&bh->b_data[0]; | |
f7f4bccb MC |
581 | header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); |
582 | header->h_blocktype = cpu_to_be32(JBD2_DESCRIPTOR_BLOCK); | |
470decc6 DK |
583 | header->h_sequence = cpu_to_be32(commit_transaction->t_tid); |
584 | ||
585 | tagp = &bh->b_data[sizeof(journal_header_t)]; | |
586 | space_left = bh->b_size - sizeof(journal_header_t); | |
587 | first_tag = 1; | |
588 | set_buffer_jwrite(bh); | |
589 | set_buffer_dirty(bh); | |
590 | wbuf[bufs++] = bh; | |
591 | ||
592 | /* Record it so that we can wait for IO | |
593 | completion later */ | |
594 | BUFFER_TRACE(bh, "ph3: file as descriptor"); | |
f7f4bccb | 595 | jbd2_journal_file_buffer(descriptor, commit_transaction, |
470decc6 DK |
596 | BJ_LogCtl); |
597 | } | |
598 | ||
599 | /* Where is the buffer to be written? */ | |
600 | ||
f7f4bccb | 601 | err = jbd2_journal_next_log_block(journal, &blocknr); |
470decc6 DK |
602 | /* If the block mapping failed, just abandon the buffer |
603 | and repeat this loop: we'll fall into the | |
604 | refile-on-abort condition above. */ | |
605 | if (err) { | |
a7fa2baf | 606 | jbd2_journal_abort(journal, err); |
470decc6 DK |
607 | continue; |
608 | } | |
609 | ||
610 | /* | |
611 | * start_this_handle() uses t_outstanding_credits to determine | |
612 | * the free space in the log, but this counter is changed | |
f7f4bccb | 613 | * by jbd2_journal_next_log_block() also. |
470decc6 | 614 | */ |
a51dca9c | 615 | atomic_dec(&commit_transaction->t_outstanding_credits); |
470decc6 DK |
616 | |
617 | /* Bump b_count to prevent truncate from stumbling over | |
618 | the shadowed buffer! @@@ This can go if we ever get | |
619 | rid of the BJ_IO/BJ_Shadow pairing of buffers. */ | |
620 | atomic_inc(&jh2bh(jh)->b_count); | |
621 | ||
622 | /* Make a temporary IO buffer with which to write it out | |
623 | (this will requeue both the metadata buffer and the | |
624 | temporary IO buffer). new_bh goes on BJ_IO*/ | |
625 | ||
626 | set_bit(BH_JWrite, &jh2bh(jh)->b_state); | |
627 | /* | |
f7f4bccb | 628 | * akpm: jbd2_journal_write_metadata_buffer() sets |
470decc6 DK |
629 | * new_bh->b_transaction to commit_transaction. |
630 | * We need to clean this up before we release new_bh | |
631 | * (which is of type BJ_IO) | |
632 | */ | |
633 | JBUFFER_TRACE(jh, "ph3: write metadata"); | |
f7f4bccb | 634 | flags = jbd2_journal_write_metadata_buffer(commit_transaction, |
470decc6 | 635 | jh, &new_jh, blocknr); |
e6ec116b TT |
636 | if (flags < 0) { |
637 | jbd2_journal_abort(journal, flags); | |
638 | continue; | |
639 | } | |
470decc6 DK |
640 | set_bit(BH_JWrite, &jh2bh(new_jh)->b_state); |
641 | wbuf[bufs++] = jh2bh(new_jh); | |
642 | ||
643 | /* Record the new block's tag in the current descriptor | |
644 | buffer */ | |
645 | ||
646 | tag_flag = 0; | |
647 | if (flags & 1) | |
f7f4bccb | 648 | tag_flag |= JBD2_FLAG_ESCAPE; |
470decc6 | 649 | if (!first_tag) |
f7f4bccb | 650 | tag_flag |= JBD2_FLAG_SAME_UUID; |
470decc6 DK |
651 | |
652 | tag = (journal_block_tag_t *) tagp; | |
b517bea1 | 653 | write_tag_block(tag_bytes, tag, jh2bh(jh)->b_blocknr); |
470decc6 | 654 | tag->t_flags = cpu_to_be32(tag_flag); |
b517bea1 ZB |
655 | tagp += tag_bytes; |
656 | space_left -= tag_bytes; | |
470decc6 DK |
657 | |
658 | if (first_tag) { | |
659 | memcpy (tagp, journal->j_uuid, 16); | |
660 | tagp += 16; | |
661 | space_left -= 16; | |
662 | first_tag = 0; | |
663 | } | |
664 | ||
665 | /* If there's no more to do, or if the descriptor is full, | |
666 | let the IO rip! */ | |
667 | ||
668 | if (bufs == journal->j_wbufsize || | |
669 | commit_transaction->t_buffers == NULL || | |
b517bea1 | 670 | space_left < tag_bytes + 16) { |
470decc6 DK |
671 | |
672 | jbd_debug(4, "JBD: Submit %d IOs\n", bufs); | |
673 | ||
674 | /* Write an end-of-descriptor marker before | |
675 | submitting the IOs. "tag" still points to | |
676 | the last tag we set up. */ | |
677 | ||
f7f4bccb | 678 | tag->t_flags |= cpu_to_be32(JBD2_FLAG_LAST_TAG); |
470decc6 DK |
679 | |
680 | start_journal_io: | |
681 | for (i = 0; i < bufs; i++) { | |
682 | struct buffer_head *bh = wbuf[i]; | |
818d276c GS |
683 | /* |
684 | * Compute checksum. | |
685 | */ | |
686 | if (JBD2_HAS_COMPAT_FEATURE(journal, | |
687 | JBD2_FEATURE_COMPAT_CHECKSUM)) { | |
688 | crc32_sum = | |
689 | jbd2_checksum_data(crc32_sum, bh); | |
690 | } | |
691 | ||
470decc6 DK |
692 | lock_buffer(bh); |
693 | clear_buffer_dirty(bh); | |
694 | set_buffer_uptodate(bh); | |
695 | bh->b_end_io = journal_end_buffer_io_sync; | |
7058548c | 696 | submit_bh(write_op, bh); |
470decc6 DK |
697 | } |
698 | cond_resched(); | |
bf699327 | 699 | stats.run.rs_blocks_logged += bufs; |
470decc6 DK |
700 | |
701 | /* Force a new descriptor to be generated next | |
702 | time round the loop. */ | |
703 | descriptor = NULL; | |
704 | bufs = 0; | |
705 | } | |
706 | } | |
707 | ||
cc3e1bea TT |
708 | /* |
709 | * If the journal is not located on the file system device, | |
710 | * then we must flush the file system device before we issue | |
711 | * the commit record | |
712 | */ | |
713 | if (commit_transaction->t_flushed_data_blocks && | |
714 | (journal->j_fs_dev != journal->j_dev) && | |
715 | (journal->j_flags & JBD2_BARRIER)) | |
fbd9b09a DM |
716 | blkdev_issue_flush(journal->j_fs_dev, GFP_KERNEL, NULL, |
717 | BLKDEV_IFL_WAIT); | |
818d276c | 718 | |
cc3e1bea | 719 | /* Done it all: now write the commit record asynchronously. */ |
818d276c | 720 | if (JBD2_HAS_INCOMPAT_FEATURE(journal, |
0e3d2a63 | 721 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { |
818d276c GS |
722 | err = journal_submit_commit_record(journal, commit_transaction, |
723 | &cbh, crc32_sum); | |
724 | if (err) | |
725 | __jbd2_journal_abort_hard(journal); | |
0e3d2a63 | 726 | if (journal->j_flags & JBD2_BARRIER) |
fbd9b09a DM |
727 | blkdev_issue_flush(journal->j_dev, GFP_KERNEL, NULL, |
728 | BLKDEV_IFL_WAIT); | |
818d276c GS |
729 | } |
730 | ||
c851ed54 | 731 | err = journal_finish_inode_data_buffers(journal, commit_transaction); |
e9e34f4e | 732 | if (err) { |
e9e34f4e HK |
733 | printk(KERN_WARNING |
734 | "JBD2: Detected IO errors while flushing file data " | |
05496769 | 735 | "on %s\n", journal->j_devname); |
5bf5683a HK |
736 | if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR) |
737 | jbd2_journal_abort(journal, err); | |
e9e34f4e HK |
738 | err = 0; |
739 | } | |
c851ed54 | 740 | |
470decc6 DK |
741 | /* Lo and behold: we have just managed to send a transaction to |
742 | the log. Before we can commit it, wait for the IO so far to | |
743 | complete. Control buffers being written are on the | |
744 | transaction's t_log_list queue, and metadata buffers are on | |
745 | the t_iobuf_list queue. | |
746 | ||
747 | Wait for the buffers in reverse order. That way we are | |
748 | less likely to be woken up until all IOs have completed, and | |
749 | so we incur less scheduling load. | |
750 | */ | |
751 | ||
87c89c23 | 752 | jbd_debug(3, "JBD: commit phase 3\n"); |
470decc6 DK |
753 | |
754 | /* | |
755 | * akpm: these are BJ_IO, and j_list_lock is not needed. | |
756 | * See __journal_try_to_free_buffer. | |
757 | */ | |
758 | wait_for_iobuf: | |
759 | while (commit_transaction->t_iobuf_list != NULL) { | |
760 | struct buffer_head *bh; | |
761 | ||
762 | jh = commit_transaction->t_iobuf_list->b_tprev; | |
763 | bh = jh2bh(jh); | |
764 | if (buffer_locked(bh)) { | |
765 | wait_on_buffer(bh); | |
766 | goto wait_for_iobuf; | |
767 | } | |
768 | if (cond_resched()) | |
769 | goto wait_for_iobuf; | |
770 | ||
771 | if (unlikely(!buffer_uptodate(bh))) | |
772 | err = -EIO; | |
773 | ||
774 | clear_buffer_jwrite(bh); | |
775 | ||
776 | JBUFFER_TRACE(jh, "ph4: unfile after journal write"); | |
f7f4bccb | 777 | jbd2_journal_unfile_buffer(journal, jh); |
470decc6 DK |
778 | |
779 | /* | |
780 | * ->t_iobuf_list should contain only dummy buffer_heads | |
f7f4bccb | 781 | * which were created by jbd2_journal_write_metadata_buffer(). |
470decc6 DK |
782 | */ |
783 | BUFFER_TRACE(bh, "dumping temporary bh"); | |
f7f4bccb | 784 | jbd2_journal_put_journal_head(jh); |
470decc6 DK |
785 | __brelse(bh); |
786 | J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0); | |
787 | free_buffer_head(bh); | |
788 | ||
789 | /* We also have to unlock and free the corresponding | |
790 | shadowed buffer */ | |
791 | jh = commit_transaction->t_shadow_list->b_tprev; | |
792 | bh = jh2bh(jh); | |
793 | clear_bit(BH_JWrite, &bh->b_state); | |
794 | J_ASSERT_BH(bh, buffer_jbddirty(bh)); | |
795 | ||
796 | /* The metadata is now released for reuse, but we need | |
797 | to remember it against this transaction so that when | |
798 | we finally commit, we can do any checkpointing | |
799 | required. */ | |
800 | JBUFFER_TRACE(jh, "file as BJ_Forget"); | |
f7f4bccb | 801 | jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget); |
470decc6 DK |
802 | /* Wake up any transactions which were waiting for this |
803 | IO to complete */ | |
804 | wake_up_bit(&bh->b_state, BH_Unshadow); | |
805 | JBUFFER_TRACE(jh, "brelse shadowed buffer"); | |
806 | __brelse(bh); | |
807 | } | |
808 | ||
809 | J_ASSERT (commit_transaction->t_shadow_list == NULL); | |
810 | ||
87c89c23 | 811 | jbd_debug(3, "JBD: commit phase 4\n"); |
470decc6 DK |
812 | |
813 | /* Here we wait for the revoke record and descriptor record buffers */ | |
814 | wait_for_ctlbuf: | |
815 | while (commit_transaction->t_log_list != NULL) { | |
816 | struct buffer_head *bh; | |
817 | ||
818 | jh = commit_transaction->t_log_list->b_tprev; | |
819 | bh = jh2bh(jh); | |
820 | if (buffer_locked(bh)) { | |
821 | wait_on_buffer(bh); | |
822 | goto wait_for_ctlbuf; | |
823 | } | |
824 | if (cond_resched()) | |
825 | goto wait_for_ctlbuf; | |
826 | ||
827 | if (unlikely(!buffer_uptodate(bh))) | |
828 | err = -EIO; | |
829 | ||
830 | BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile"); | |
831 | clear_buffer_jwrite(bh); | |
f7f4bccb MC |
832 | jbd2_journal_unfile_buffer(journal, jh); |
833 | jbd2_journal_put_journal_head(jh); | |
470decc6 DK |
834 | __brelse(bh); /* One for getblk */ |
835 | /* AKPM: bforget here */ | |
836 | } | |
837 | ||
77e841de HK |
838 | if (err) |
839 | jbd2_journal_abort(journal, err); | |
840 | ||
87c89c23 | 841 | jbd_debug(3, "JBD: commit phase 5\n"); |
470decc6 | 842 | |
818d276c | 843 | if (!JBD2_HAS_INCOMPAT_FEATURE(journal, |
0e3d2a63 | 844 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { |
818d276c GS |
845 | err = journal_submit_commit_record(journal, commit_transaction, |
846 | &cbh, crc32_sum); | |
847 | if (err) | |
848 | __jbd2_journal_abort_hard(journal); | |
849 | } | |
b048d846 | 850 | if (!err && !is_journal_aborted(journal)) |
fd98496f | 851 | err = journal_wait_on_commit_record(journal, cbh); |
470decc6 DK |
852 | |
853 | if (err) | |
a7fa2baf | 854 | jbd2_journal_abort(journal, err); |
470decc6 DK |
855 | |
856 | /* End of a transaction! Finally, we can do checkpoint | |
857 | processing: any buffers committed as a result of this | |
858 | transaction can be removed from any checkpoint list it was on | |
859 | before. */ | |
860 | ||
87c89c23 | 861 | jbd_debug(3, "JBD: commit phase 6\n"); |
470decc6 | 862 | |
c851ed54 | 863 | J_ASSERT(list_empty(&commit_transaction->t_inode_list)); |
470decc6 DK |
864 | J_ASSERT(commit_transaction->t_buffers == NULL); |
865 | J_ASSERT(commit_transaction->t_checkpoint_list == NULL); | |
866 | J_ASSERT(commit_transaction->t_iobuf_list == NULL); | |
867 | J_ASSERT(commit_transaction->t_shadow_list == NULL); | |
868 | J_ASSERT(commit_transaction->t_log_list == NULL); | |
869 | ||
870 | restart_loop: | |
871 | /* | |
872 | * As there are other places (journal_unmap_buffer()) adding buffers | |
873 | * to this list we have to be careful and hold the j_list_lock. | |
874 | */ | |
875 | spin_lock(&journal->j_list_lock); | |
876 | while (commit_transaction->t_forget) { | |
877 | transaction_t *cp_transaction; | |
878 | struct buffer_head *bh; | |
879 | ||
880 | jh = commit_transaction->t_forget; | |
881 | spin_unlock(&journal->j_list_lock); | |
882 | bh = jh2bh(jh); | |
883 | jbd_lock_bh_state(bh); | |
23e2af35 | 884 | J_ASSERT_JH(jh, jh->b_transaction == commit_transaction); |
470decc6 DK |
885 | |
886 | /* | |
887 | * If there is undo-protected committed data against | |
888 | * this buffer, then we can remove it now. If it is a | |
889 | * buffer needing such protection, the old frozen_data | |
890 | * field now points to a committed version of the | |
891 | * buffer, so rotate that field to the new committed | |
892 | * data. | |
893 | * | |
894 | * Otherwise, we can just throw away the frozen data now. | |
e06c8227 JB |
895 | * |
896 | * We also know that the frozen data has already fired | |
897 | * its triggers if they exist, so we can clear that too. | |
470decc6 DK |
898 | */ |
899 | if (jh->b_committed_data) { | |
af1e76d6 | 900 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
901 | jh->b_committed_data = NULL; |
902 | if (jh->b_frozen_data) { | |
903 | jh->b_committed_data = jh->b_frozen_data; | |
904 | jh->b_frozen_data = NULL; | |
e06c8227 | 905 | jh->b_frozen_triggers = NULL; |
470decc6 DK |
906 | } |
907 | } else if (jh->b_frozen_data) { | |
af1e76d6 | 908 | jbd2_free(jh->b_frozen_data, bh->b_size); |
470decc6 | 909 | jh->b_frozen_data = NULL; |
e06c8227 | 910 | jh->b_frozen_triggers = NULL; |
470decc6 DK |
911 | } |
912 | ||
913 | spin_lock(&journal->j_list_lock); | |
914 | cp_transaction = jh->b_cp_transaction; | |
915 | if (cp_transaction) { | |
916 | JBUFFER_TRACE(jh, "remove from old cp transaction"); | |
8e85fb3f | 917 | cp_transaction->t_chp_stats.cs_dropped++; |
f7f4bccb | 918 | __jbd2_journal_remove_checkpoint(jh); |
470decc6 DK |
919 | } |
920 | ||
921 | /* Only re-checkpoint the buffer_head if it is marked | |
922 | * dirty. If the buffer was added to the BJ_Forget list | |
f7f4bccb | 923 | * by jbd2_journal_forget, it may no longer be dirty and |
470decc6 DK |
924 | * there's no point in keeping a checkpoint record for |
925 | * it. */ | |
926 | ||
927 | /* A buffer which has been freed while still being | |
928 | * journaled by a previous transaction may end up still | |
929 | * being dirty here, but we want to avoid writing back | |
ba869023 | 930 | * that buffer in the future after the "add to orphan" |
931 | * operation been committed, That's not only a performance | |
932 | * gain, it also stops aliasing problems if the buffer is | |
933 | * left behind for writeback and gets reallocated for another | |
470decc6 | 934 | * use in a different page. */ |
ba869023 | 935 | if (buffer_freed(bh) && !jh->b_next_transaction) { |
470decc6 DK |
936 | clear_buffer_freed(bh); |
937 | clear_buffer_jbddirty(bh); | |
938 | } | |
939 | ||
940 | if (buffer_jbddirty(bh)) { | |
941 | JBUFFER_TRACE(jh, "add to new checkpointing trans"); | |
f7f4bccb | 942 | __jbd2_journal_insert_checkpoint(jh, commit_transaction); |
7ad7445f HK |
943 | if (is_journal_aborted(journal)) |
944 | clear_buffer_jbddirty(bh); | |
470decc6 | 945 | JBUFFER_TRACE(jh, "refile for checkpoint writeback"); |
f7f4bccb | 946 | __jbd2_journal_refile_buffer(jh); |
470decc6 DK |
947 | jbd_unlock_bh_state(bh); |
948 | } else { | |
949 | J_ASSERT_BH(bh, !buffer_dirty(bh)); | |
950 | /* The buffer on BJ_Forget list and not jbddirty means | |
951 | * it has been freed by this transaction and hence it | |
952 | * could not have been reallocated until this | |
953 | * transaction has committed. *BUT* it could be | |
954 | * reallocated once we have written all the data to | |
955 | * disk and before we process the buffer on BJ_Forget | |
956 | * list. */ | |
957 | JBUFFER_TRACE(jh, "refile or unfile freed buffer"); | |
f7f4bccb | 958 | __jbd2_journal_refile_buffer(jh); |
470decc6 DK |
959 | if (!jh->b_transaction) { |
960 | jbd_unlock_bh_state(bh); | |
961 | /* needs a brelse */ | |
f7f4bccb | 962 | jbd2_journal_remove_journal_head(bh); |
470decc6 DK |
963 | release_buffer_page(bh); |
964 | } else | |
965 | jbd_unlock_bh_state(bh); | |
966 | } | |
967 | cond_resched_lock(&journal->j_list_lock); | |
968 | } | |
969 | spin_unlock(&journal->j_list_lock); | |
970 | /* | |
f5a7a6b0 JK |
971 | * This is a bit sleazy. We use j_list_lock to protect transition |
972 | * of a transaction into T_FINISHED state and calling | |
973 | * __jbd2_journal_drop_transaction(). Otherwise we could race with | |
974 | * other checkpointing code processing the transaction... | |
470decc6 | 975 | */ |
a931da6a | 976 | write_lock(&journal->j_state_lock); |
470decc6 DK |
977 | spin_lock(&journal->j_list_lock); |
978 | /* | |
979 | * Now recheck if some buffers did not get attached to the transaction | |
980 | * while the lock was dropped... | |
981 | */ | |
982 | if (commit_transaction->t_forget) { | |
983 | spin_unlock(&journal->j_list_lock); | |
a931da6a | 984 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
985 | goto restart_loop; |
986 | } | |
987 | ||
988 | /* Done with this transaction! */ | |
989 | ||
87c89c23 | 990 | jbd_debug(3, "JBD: commit phase 7\n"); |
470decc6 DK |
991 | |
992 | J_ASSERT(commit_transaction->t_state == T_COMMIT); | |
993 | ||
8e85fb3f | 994 | commit_transaction->t_start = jiffies; |
bf699327 TT |
995 | stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging, |
996 | commit_transaction->t_start); | |
8e85fb3f JL |
997 | |
998 | /* | |
bf699327 | 999 | * File the transaction statistics |
8e85fb3f | 1000 | */ |
8e85fb3f | 1001 | stats.ts_tid = commit_transaction->t_tid; |
8dd42046 TT |
1002 | stats.run.rs_handle_count = |
1003 | atomic_read(&commit_transaction->t_handle_count); | |
bf699327 TT |
1004 | trace_jbd2_run_stats(journal->j_fs_dev->bd_dev, |
1005 | commit_transaction->t_tid, &stats.run); | |
8e85fb3f JL |
1006 | |
1007 | /* | |
1008 | * Calculate overall stats | |
1009 | */ | |
bf699327 | 1010 | spin_lock(&journal->j_history_lock); |
8e85fb3f | 1011 | journal->j_stats.ts_tid++; |
bf699327 TT |
1012 | journal->j_stats.run.rs_wait += stats.run.rs_wait; |
1013 | journal->j_stats.run.rs_running += stats.run.rs_running; | |
1014 | journal->j_stats.run.rs_locked += stats.run.rs_locked; | |
1015 | journal->j_stats.run.rs_flushing += stats.run.rs_flushing; | |
1016 | journal->j_stats.run.rs_logging += stats.run.rs_logging; | |
1017 | journal->j_stats.run.rs_handle_count += stats.run.rs_handle_count; | |
1018 | journal->j_stats.run.rs_blocks += stats.run.rs_blocks; | |
1019 | journal->j_stats.run.rs_blocks_logged += stats.run.rs_blocks_logged; | |
8e85fb3f JL |
1020 | spin_unlock(&journal->j_history_lock); |
1021 | ||
470decc6 DK |
1022 | commit_transaction->t_state = T_FINISHED; |
1023 | J_ASSERT(commit_transaction == journal->j_committing_transaction); | |
1024 | journal->j_commit_sequence = commit_transaction->t_tid; | |
1025 | journal->j_committing_transaction = NULL; | |
e07f7183 | 1026 | commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time)); |
470decc6 | 1027 | |
e07f7183 JB |
1028 | /* |
1029 | * weight the commit time higher than the average time so we don't | |
1030 | * react too strongly to vast changes in the commit time | |
1031 | */ | |
1032 | if (likely(journal->j_average_commit_time)) | |
1033 | journal->j_average_commit_time = (commit_time + | |
1034 | journal->j_average_commit_time*3) / 4; | |
1035 | else | |
1036 | journal->j_average_commit_time = commit_time; | |
a931da6a | 1037 | write_unlock(&journal->j_state_lock); |
6c20ec85 | 1038 | |
f89b7795 JK |
1039 | if (commit_transaction->t_checkpoint_list == NULL && |
1040 | commit_transaction->t_checkpoint_io_list == NULL) { | |
f7f4bccb | 1041 | __jbd2_journal_drop_transaction(journal, commit_transaction); |
fb68407b | 1042 | to_free = 1; |
470decc6 DK |
1043 | } else { |
1044 | if (journal->j_checkpoint_transactions == NULL) { | |
1045 | journal->j_checkpoint_transactions = commit_transaction; | |
1046 | commit_transaction->t_cpnext = commit_transaction; | |
1047 | commit_transaction->t_cpprev = commit_transaction; | |
1048 | } else { | |
1049 | commit_transaction->t_cpnext = | |
1050 | journal->j_checkpoint_transactions; | |
1051 | commit_transaction->t_cpprev = | |
1052 | commit_transaction->t_cpnext->t_cpprev; | |
1053 | commit_transaction->t_cpnext->t_cpprev = | |
1054 | commit_transaction; | |
1055 | commit_transaction->t_cpprev->t_cpnext = | |
1056 | commit_transaction; | |
1057 | } | |
1058 | } | |
1059 | spin_unlock(&journal->j_list_lock); | |
1060 | ||
fb68407b AK |
1061 | if (journal->j_commit_callback) |
1062 | journal->j_commit_callback(journal, commit_transaction); | |
1063 | ||
879c5e6b | 1064 | trace_jbd2_end_commit(journal, commit_transaction); |
470decc6 DK |
1065 | jbd_debug(1, "JBD: commit %d complete, head %d\n", |
1066 | journal->j_commit_sequence, journal->j_tail_sequence); | |
fb68407b AK |
1067 | if (to_free) |
1068 | kfree(commit_transaction); | |
470decc6 DK |
1069 | |
1070 | wake_up(&journal->j_wait_done_commit); | |
1071 | } |