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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; |
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 && | |
0e3d2a63 TT |
136 | !JBD2_HAS_INCOMPAT_FEATURE(journal, |
137 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { | |
87e99511 CH |
138 | ret = submit_bh(WRITE_SYNC_PLUG | WRITE_BARRIER, bh); |
139 | if (ret == -EOPNOTSUPP) { | |
140 | printk(KERN_WARNING | |
141 | "JBD2: Disabling barriers on %s, " | |
142 | "not supported by device\n", journal->j_devname); | |
143 | write_lock(&journal->j_state_lock); | |
144 | journal->j_flags &= ~JBD2_BARRIER; | |
145 | write_unlock(&journal->j_state_lock); | |
146 | ||
147 | /* And try again, without the barrier */ | |
148 | lock_buffer(bh); | |
149 | set_buffer_uptodate(bh); | |
150 | clear_buffer_dirty(bh); | |
151 | ret = submit_bh(WRITE_SYNC_PLUG, bh); | |
152 | } | |
153 | } else { | |
4194b1ea | 154 | ret = submit_bh(WRITE_SYNC_PLUG, bh); |
470decc6 | 155 | } |
818d276c GS |
156 | *cbh = bh; |
157 | return ret; | |
158 | } | |
159 | ||
160 | /* | |
161 | * This function along with journal_submit_commit_record | |
162 | * allows to write the commit record asynchronously. | |
163 | */ | |
fd98496f TT |
164 | static int journal_wait_on_commit_record(journal_t *journal, |
165 | struct buffer_head *bh) | |
818d276c GS |
166 | { |
167 | int ret = 0; | |
168 | ||
fd98496f | 169 | retry: |
818d276c GS |
170 | clear_buffer_dirty(bh); |
171 | wait_on_buffer(bh); | |
fd98496f TT |
172 | if (buffer_eopnotsupp(bh) && (journal->j_flags & JBD2_BARRIER)) { |
173 | printk(KERN_WARNING | |
cc937db7 ES |
174 | "JBD2: %s: disabling barries on %s - not supported " |
175 | "by device\n", __func__, journal->j_devname); | |
a931da6a | 176 | write_lock(&journal->j_state_lock); |
fd98496f | 177 | journal->j_flags &= ~JBD2_BARRIER; |
a931da6a | 178 | write_unlock(&journal->j_state_lock); |
fd98496f TT |
179 | |
180 | lock_buffer(bh); | |
181 | clear_buffer_dirty(bh); | |
182 | set_buffer_uptodate(bh); | |
183 | bh->b_end_io = journal_end_buffer_io_sync; | |
184 | ||
4194b1ea | 185 | ret = submit_bh(WRITE_SYNC_PLUG, bh); |
fd98496f TT |
186 | if (ret) { |
187 | unlock_buffer(bh); | |
188 | return ret; | |
189 | } | |
190 | goto retry; | |
191 | } | |
470decc6 | 192 | |
818d276c GS |
193 | if (unlikely(!buffer_uptodate(bh))) |
194 | ret = -EIO; | |
195 | put_bh(bh); /* One for getblk() */ | |
196 | jbd2_journal_put_journal_head(bh2jh(bh)); | |
197 | ||
198 | return ret; | |
470decc6 DK |
199 | } |
200 | ||
cd1aac32 AK |
201 | /* |
202 | * write the filemap data using writepage() address_space_operations. | |
203 | * We don't do block allocation here even for delalloc. We don't | |
204 | * use writepages() because with dealyed allocation we may be doing | |
205 | * block allocation in writepages(). | |
206 | */ | |
207 | static int journal_submit_inode_data_buffers(struct address_space *mapping) | |
208 | { | |
209 | int ret; | |
210 | struct writeback_control wbc = { | |
211 | .sync_mode = WB_SYNC_ALL, | |
212 | .nr_to_write = mapping->nrpages * 2, | |
213 | .range_start = 0, | |
214 | .range_end = i_size_read(mapping->host), | |
cd1aac32 AK |
215 | }; |
216 | ||
217 | ret = generic_writepages(mapping, &wbc); | |
218 | return ret; | |
219 | } | |
220 | ||
c851ed54 JK |
221 | /* |
222 | * Submit all the data buffers of inode associated with the transaction to | |
223 | * disk. | |
224 | * | |
225 | * We are in a committing transaction. Therefore no new inode can be added to | |
226 | * our inode list. We use JI_COMMIT_RUNNING flag to protect inode we currently | |
227 | * operate on from being released while we write out pages. | |
228 | */ | |
cd1aac32 | 229 | static int journal_submit_data_buffers(journal_t *journal, |
c851ed54 JK |
230 | transaction_t *commit_transaction) |
231 | { | |
232 | struct jbd2_inode *jinode; | |
233 | int err, ret = 0; | |
234 | struct address_space *mapping; | |
235 | ||
236 | spin_lock(&journal->j_list_lock); | |
237 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { | |
238 | mapping = jinode->i_vfs_inode->i_mapping; | |
239 | jinode->i_flags |= JI_COMMIT_RUNNING; | |
240 | spin_unlock(&journal->j_list_lock); | |
cd1aac32 AK |
241 | /* |
242 | * submit the inode data buffers. We use writepage | |
243 | * instead of writepages. Because writepages can do | |
244 | * block allocation with delalloc. We need to write | |
245 | * only allocated blocks here. | |
246 | */ | |
879c5e6b | 247 | trace_jbd2_submit_inode_data(jinode->i_vfs_inode); |
cd1aac32 | 248 | err = journal_submit_inode_data_buffers(mapping); |
c851ed54 JK |
249 | if (!ret) |
250 | ret = err; | |
251 | spin_lock(&journal->j_list_lock); | |
252 | J_ASSERT(jinode->i_transaction == commit_transaction); | |
cc3e1bea | 253 | commit_transaction->t_flushed_data_blocks = 1; |
c851ed54 JK |
254 | jinode->i_flags &= ~JI_COMMIT_RUNNING; |
255 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); | |
256 | } | |
257 | spin_unlock(&journal->j_list_lock); | |
258 | return ret; | |
259 | } | |
260 | ||
261 | /* | |
262 | * Wait for data submitted for writeout, refile inodes to proper | |
263 | * transaction if needed. | |
264 | * | |
265 | */ | |
266 | static int journal_finish_inode_data_buffers(journal_t *journal, | |
267 | transaction_t *commit_transaction) | |
268 | { | |
269 | struct jbd2_inode *jinode, *next_i; | |
270 | int err, ret = 0; | |
271 | ||
cd1aac32 | 272 | /* For locking, see the comment in journal_submit_data_buffers() */ |
c851ed54 JK |
273 | spin_lock(&journal->j_list_lock); |
274 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { | |
275 | jinode->i_flags |= JI_COMMIT_RUNNING; | |
276 | spin_unlock(&journal->j_list_lock); | |
277 | err = filemap_fdatawait(jinode->i_vfs_inode->i_mapping); | |
e9e34f4e HK |
278 | if (err) { |
279 | /* | |
280 | * Because AS_EIO is cleared by | |
94004ed7 | 281 | * filemap_fdatawait_range(), set it again so |
e9e34f4e HK |
282 | * that user process can get -EIO from fsync(). |
283 | */ | |
284 | set_bit(AS_EIO, | |
285 | &jinode->i_vfs_inode->i_mapping->flags); | |
286 | ||
287 | if (!ret) | |
288 | ret = err; | |
289 | } | |
c851ed54 JK |
290 | spin_lock(&journal->j_list_lock); |
291 | jinode->i_flags &= ~JI_COMMIT_RUNNING; | |
292 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); | |
293 | } | |
294 | ||
295 | /* Now refile inode to proper lists */ | |
296 | list_for_each_entry_safe(jinode, next_i, | |
297 | &commit_transaction->t_inode_list, i_list) { | |
298 | list_del(&jinode->i_list); | |
299 | if (jinode->i_next_transaction) { | |
300 | jinode->i_transaction = jinode->i_next_transaction; | |
301 | jinode->i_next_transaction = NULL; | |
302 | list_add(&jinode->i_list, | |
303 | &jinode->i_transaction->t_inode_list); | |
304 | } else { | |
305 | jinode->i_transaction = NULL; | |
306 | } | |
307 | } | |
308 | spin_unlock(&journal->j_list_lock); | |
309 | ||
310 | return ret; | |
311 | } | |
312 | ||
818d276c GS |
313 | static __u32 jbd2_checksum_data(__u32 crc32_sum, struct buffer_head *bh) |
314 | { | |
315 | struct page *page = bh->b_page; | |
316 | char *addr; | |
317 | __u32 checksum; | |
318 | ||
319 | addr = kmap_atomic(page, KM_USER0); | |
320 | checksum = crc32_be(crc32_sum, | |
321 | (void *)(addr + offset_in_page(bh->b_data)), bh->b_size); | |
322 | kunmap_atomic(addr, KM_USER0); | |
323 | ||
324 | return checksum; | |
325 | } | |
326 | ||
327 | static void write_tag_block(int tag_bytes, journal_block_tag_t *tag, | |
18eba7aa | 328 | unsigned long long block) |
b517bea1 ZB |
329 | { |
330 | tag->t_blocknr = cpu_to_be32(block & (u32)~0); | |
cd02ff0b | 331 | if (tag_bytes > JBD2_TAG_SIZE32) |
b517bea1 ZB |
332 | tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1); |
333 | } | |
334 | ||
470decc6 | 335 | /* |
f7f4bccb | 336 | * jbd2_journal_commit_transaction |
470decc6 DK |
337 | * |
338 | * The primary function for committing a transaction to the log. This | |
339 | * function is called by the journal thread to begin a complete commit. | |
340 | */ | |
f7f4bccb | 341 | void jbd2_journal_commit_transaction(journal_t *journal) |
470decc6 | 342 | { |
8e85fb3f | 343 | struct transaction_stats_s stats; |
470decc6 DK |
344 | transaction_t *commit_transaction; |
345 | struct journal_head *jh, *new_jh, *descriptor; | |
346 | struct buffer_head **wbuf = journal->j_wbuf; | |
347 | int bufs; | |
348 | int flags; | |
349 | int err; | |
18eba7aa | 350 | unsigned long long blocknr; |
e07f7183 JB |
351 | ktime_t start_time; |
352 | u64 commit_time; | |
470decc6 DK |
353 | char *tagp = NULL; |
354 | journal_header_t *header; | |
355 | journal_block_tag_t *tag = NULL; | |
356 | int space_left = 0; | |
357 | int first_tag = 0; | |
358 | int tag_flag; | |
fb68407b | 359 | int i, to_free = 0; |
b517bea1 | 360 | int tag_bytes = journal_tag_bytes(journal); |
818d276c GS |
361 | struct buffer_head *cbh = NULL; /* For transactional checksums */ |
362 | __u32 crc32_sum = ~0; | |
7058548c | 363 | int write_op = WRITE; |
470decc6 DK |
364 | |
365 | /* | |
366 | * First job: lock down the current transaction and wait for | |
367 | * all outstanding updates to complete. | |
368 | */ | |
369 | ||
370 | #ifdef COMMIT_STATS | |
371 | spin_lock(&journal->j_list_lock); | |
372 | summarise_journal_usage(journal); | |
373 | spin_unlock(&journal->j_list_lock); | |
374 | #endif | |
375 | ||
f7f4bccb MC |
376 | /* Do we need to erase the effects of a prior jbd2_journal_flush? */ |
377 | if (journal->j_flags & JBD2_FLUSHED) { | |
470decc6 | 378 | jbd_debug(3, "super block updated\n"); |
f7f4bccb | 379 | jbd2_journal_update_superblock(journal, 1); |
470decc6 DK |
380 | } else { |
381 | jbd_debug(3, "superblock not updated\n"); | |
382 | } | |
383 | ||
384 | J_ASSERT(journal->j_running_transaction != NULL); | |
385 | J_ASSERT(journal->j_committing_transaction == NULL); | |
386 | ||
387 | commit_transaction = journal->j_running_transaction; | |
388 | J_ASSERT(commit_transaction->t_state == T_RUNNING); | |
389 | ||
879c5e6b | 390 | trace_jbd2_start_commit(journal, commit_transaction); |
470decc6 DK |
391 | jbd_debug(1, "JBD: starting commit of transaction %d\n", |
392 | commit_transaction->t_tid); | |
393 | ||
a931da6a | 394 | write_lock(&journal->j_state_lock); |
470decc6 DK |
395 | commit_transaction->t_state = T_LOCKED; |
396 | ||
4194b1ea JA |
397 | /* |
398 | * Use plugged writes here, since we want to submit several before | |
399 | * we unplug the device. We don't do explicit unplugging in here, | |
400 | * instead we rely on sync_buffer() doing the unplug for us. | |
401 | */ | |
7058548c | 402 | if (commit_transaction->t_synchronous_commit) |
4194b1ea | 403 | write_op = WRITE_SYNC_PLUG; |
879c5e6b | 404 | trace_jbd2_commit_locking(journal, commit_transaction); |
bf699327 TT |
405 | stats.run.rs_wait = commit_transaction->t_max_wait; |
406 | stats.run.rs_locked = jiffies; | |
407 | stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start, | |
408 | stats.run.rs_locked); | |
8e85fb3f | 409 | |
470decc6 | 410 | spin_lock(&commit_transaction->t_handle_lock); |
a51dca9c | 411 | while (atomic_read(&commit_transaction->t_updates)) { |
470decc6 DK |
412 | DEFINE_WAIT(wait); |
413 | ||
414 | prepare_to_wait(&journal->j_wait_updates, &wait, | |
415 | TASK_UNINTERRUPTIBLE); | |
a51dca9c | 416 | if (atomic_read(&commit_transaction->t_updates)) { |
470decc6 | 417 | spin_unlock(&commit_transaction->t_handle_lock); |
a931da6a | 418 | write_unlock(&journal->j_state_lock); |
470decc6 | 419 | schedule(); |
a931da6a | 420 | write_lock(&journal->j_state_lock); |
470decc6 DK |
421 | spin_lock(&commit_transaction->t_handle_lock); |
422 | } | |
423 | finish_wait(&journal->j_wait_updates, &wait); | |
424 | } | |
425 | spin_unlock(&commit_transaction->t_handle_lock); | |
426 | ||
a51dca9c | 427 | J_ASSERT (atomic_read(&commit_transaction->t_outstanding_credits) <= |
470decc6 DK |
428 | journal->j_max_transaction_buffers); |
429 | ||
430 | /* | |
431 | * First thing we are allowed to do is to discard any remaining | |
432 | * BJ_Reserved buffers. Note, it is _not_ permissible to assume | |
433 | * that there are no such buffers: if a large filesystem | |
434 | * operation like a truncate needs to split itself over multiple | |
f7f4bccb | 435 | * transactions, then it may try to do a jbd2_journal_restart() while |
470decc6 DK |
436 | * there are still BJ_Reserved buffers outstanding. These must |
437 | * be released cleanly from the current transaction. | |
438 | * | |
439 | * In this case, the filesystem must still reserve write access | |
440 | * again before modifying the buffer in the new transaction, but | |
441 | * we do not require it to remember exactly which old buffers it | |
442 | * has reserved. This is consistent with the existing behaviour | |
f7f4bccb | 443 | * that multiple jbd2_journal_get_write_access() calls to the same |
470decc6 DK |
444 | * buffer are perfectly permissable. |
445 | */ | |
446 | while (commit_transaction->t_reserved_list) { | |
447 | jh = commit_transaction->t_reserved_list; | |
448 | JBUFFER_TRACE(jh, "reserved, unused: refile"); | |
449 | /* | |
f7f4bccb | 450 | * A jbd2_journal_get_undo_access()+jbd2_journal_release_buffer() may |
470decc6 DK |
451 | * leave undo-committed data. |
452 | */ | |
453 | if (jh->b_committed_data) { | |
454 | struct buffer_head *bh = jh2bh(jh); | |
455 | ||
456 | jbd_lock_bh_state(bh); | |
af1e76d6 | 457 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
458 | jh->b_committed_data = NULL; |
459 | jbd_unlock_bh_state(bh); | |
460 | } | |
f7f4bccb | 461 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
462 | } |
463 | ||
464 | /* | |
465 | * Now try to drop any written-back buffers from the journal's | |
466 | * checkpoint lists. We do this *before* commit because it potentially | |
467 | * frees some memory | |
468 | */ | |
469 | spin_lock(&journal->j_list_lock); | |
f7f4bccb | 470 | __jbd2_journal_clean_checkpoint_list(journal); |
470decc6 DK |
471 | spin_unlock(&journal->j_list_lock); |
472 | ||
473 | jbd_debug (3, "JBD: commit phase 1\n"); | |
474 | ||
475 | /* | |
476 | * Switch to a new revoke table. | |
477 | */ | |
f7f4bccb | 478 | jbd2_journal_switch_revoke_table(journal); |
470decc6 | 479 | |
879c5e6b | 480 | trace_jbd2_commit_flushing(journal, commit_transaction); |
bf699327 TT |
481 | stats.run.rs_flushing = jiffies; |
482 | stats.run.rs_locked = jbd2_time_diff(stats.run.rs_locked, | |
483 | stats.run.rs_flushing); | |
8e85fb3f | 484 | |
470decc6 DK |
485 | commit_transaction->t_state = T_FLUSH; |
486 | journal->j_committing_transaction = commit_transaction; | |
487 | journal->j_running_transaction = NULL; | |
e07f7183 | 488 | start_time = ktime_get(); |
470decc6 DK |
489 | commit_transaction->t_log_start = journal->j_head; |
490 | wake_up(&journal->j_wait_transaction_locked); | |
a931da6a | 491 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
492 | |
493 | jbd_debug (3, "JBD: commit phase 2\n"); | |
494 | ||
470decc6 DK |
495 | /* |
496 | * Now start flushing things to disk, in the order they appear | |
497 | * on the transaction lists. Data blocks go first. | |
498 | */ | |
cd1aac32 | 499 | err = journal_submit_data_buffers(journal, commit_transaction); |
470decc6 | 500 | if (err) |
a7fa2baf | 501 | jbd2_journal_abort(journal, err); |
470decc6 | 502 | |
67c457a8 TT |
503 | jbd2_journal_write_revoke_records(journal, commit_transaction, |
504 | write_op); | |
470decc6 DK |
505 | |
506 | jbd_debug(3, "JBD: commit phase 2\n"); | |
507 | ||
470decc6 DK |
508 | /* |
509 | * Way to go: we have now written out all of the data for a | |
510 | * transaction! Now comes the tricky part: we need to write out | |
511 | * metadata. Loop over the transaction's entire buffer list: | |
512 | */ | |
a931da6a | 513 | write_lock(&journal->j_state_lock); |
470decc6 | 514 | commit_transaction->t_state = T_COMMIT; |
a931da6a | 515 | write_unlock(&journal->j_state_lock); |
470decc6 | 516 | |
879c5e6b | 517 | trace_jbd2_commit_logging(journal, commit_transaction); |
bf699327 TT |
518 | stats.run.rs_logging = jiffies; |
519 | stats.run.rs_flushing = jbd2_time_diff(stats.run.rs_flushing, | |
520 | stats.run.rs_logging); | |
a51dca9c TT |
521 | stats.run.rs_blocks = |
522 | atomic_read(&commit_transaction->t_outstanding_credits); | |
bf699327 | 523 | stats.run.rs_blocks_logged = 0; |
8e85fb3f | 524 | |
1dfc3220 | 525 | J_ASSERT(commit_transaction->t_nr_buffers <= |
a51dca9c | 526 | atomic_read(&commit_transaction->t_outstanding_credits)); |
1dfc3220 | 527 | |
87c89c23 | 528 | err = 0; |
470decc6 DK |
529 | descriptor = NULL; |
530 | bufs = 0; | |
531 | while (commit_transaction->t_buffers) { | |
532 | ||
533 | /* Find the next buffer to be journaled... */ | |
534 | ||
535 | jh = commit_transaction->t_buffers; | |
536 | ||
537 | /* If we're in abort mode, we just un-journal the buffer and | |
7ad7445f | 538 | release it. */ |
470decc6 DK |
539 | |
540 | if (is_journal_aborted(journal)) { | |
7ad7445f | 541 | clear_buffer_jbddirty(jh2bh(jh)); |
470decc6 | 542 | JBUFFER_TRACE(jh, "journal is aborting: refile"); |
e06c8227 JB |
543 | jbd2_buffer_abort_trigger(jh, |
544 | jh->b_frozen_data ? | |
545 | jh->b_frozen_triggers : | |
546 | jh->b_triggers); | |
f7f4bccb | 547 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
548 | /* If that was the last one, we need to clean up |
549 | * any descriptor buffers which may have been | |
550 | * already allocated, even if we are now | |
551 | * aborting. */ | |
552 | if (!commit_transaction->t_buffers) | |
553 | goto start_journal_io; | |
554 | continue; | |
555 | } | |
556 | ||
557 | /* Make sure we have a descriptor block in which to | |
558 | record the metadata buffer. */ | |
559 | ||
560 | if (!descriptor) { | |
561 | struct buffer_head *bh; | |
562 | ||
563 | J_ASSERT (bufs == 0); | |
564 | ||
565 | jbd_debug(4, "JBD: get descriptor\n"); | |
566 | ||
f7f4bccb | 567 | descriptor = jbd2_journal_get_descriptor_buffer(journal); |
470decc6 | 568 | if (!descriptor) { |
a7fa2baf | 569 | jbd2_journal_abort(journal, -EIO); |
470decc6 DK |
570 | continue; |
571 | } | |
572 | ||
573 | bh = jh2bh(descriptor); | |
574 | jbd_debug(4, "JBD: got buffer %llu (%p)\n", | |
575 | (unsigned long long)bh->b_blocknr, bh->b_data); | |
576 | header = (journal_header_t *)&bh->b_data[0]; | |
f7f4bccb MC |
577 | header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); |
578 | header->h_blocktype = cpu_to_be32(JBD2_DESCRIPTOR_BLOCK); | |
470decc6 DK |
579 | header->h_sequence = cpu_to_be32(commit_transaction->t_tid); |
580 | ||
581 | tagp = &bh->b_data[sizeof(journal_header_t)]; | |
582 | space_left = bh->b_size - sizeof(journal_header_t); | |
583 | first_tag = 1; | |
584 | set_buffer_jwrite(bh); | |
585 | set_buffer_dirty(bh); | |
586 | wbuf[bufs++] = bh; | |
587 | ||
588 | /* Record it so that we can wait for IO | |
589 | completion later */ | |
590 | BUFFER_TRACE(bh, "ph3: file as descriptor"); | |
f7f4bccb | 591 | jbd2_journal_file_buffer(descriptor, commit_transaction, |
470decc6 DK |
592 | BJ_LogCtl); |
593 | } | |
594 | ||
595 | /* Where is the buffer to be written? */ | |
596 | ||
f7f4bccb | 597 | err = jbd2_journal_next_log_block(journal, &blocknr); |
470decc6 DK |
598 | /* If the block mapping failed, just abandon the buffer |
599 | and repeat this loop: we'll fall into the | |
600 | refile-on-abort condition above. */ | |
601 | if (err) { | |
a7fa2baf | 602 | jbd2_journal_abort(journal, err); |
470decc6 DK |
603 | continue; |
604 | } | |
605 | ||
606 | /* | |
607 | * start_this_handle() uses t_outstanding_credits to determine | |
608 | * the free space in the log, but this counter is changed | |
f7f4bccb | 609 | * by jbd2_journal_next_log_block() also. |
470decc6 | 610 | */ |
a51dca9c | 611 | atomic_dec(&commit_transaction->t_outstanding_credits); |
470decc6 DK |
612 | |
613 | /* Bump b_count to prevent truncate from stumbling over | |
614 | the shadowed buffer! @@@ This can go if we ever get | |
615 | rid of the BJ_IO/BJ_Shadow pairing of buffers. */ | |
616 | atomic_inc(&jh2bh(jh)->b_count); | |
617 | ||
618 | /* Make a temporary IO buffer with which to write it out | |
619 | (this will requeue both the metadata buffer and the | |
620 | temporary IO buffer). new_bh goes on BJ_IO*/ | |
621 | ||
622 | set_bit(BH_JWrite, &jh2bh(jh)->b_state); | |
623 | /* | |
f7f4bccb | 624 | * akpm: jbd2_journal_write_metadata_buffer() sets |
470decc6 DK |
625 | * new_bh->b_transaction to commit_transaction. |
626 | * We need to clean this up before we release new_bh | |
627 | * (which is of type BJ_IO) | |
628 | */ | |
629 | JBUFFER_TRACE(jh, "ph3: write metadata"); | |
f7f4bccb | 630 | flags = jbd2_journal_write_metadata_buffer(commit_transaction, |
470decc6 | 631 | jh, &new_jh, blocknr); |
e6ec116b TT |
632 | if (flags < 0) { |
633 | jbd2_journal_abort(journal, flags); | |
634 | continue; | |
635 | } | |
470decc6 DK |
636 | set_bit(BH_JWrite, &jh2bh(new_jh)->b_state); |
637 | wbuf[bufs++] = jh2bh(new_jh); | |
638 | ||
639 | /* Record the new block's tag in the current descriptor | |
640 | buffer */ | |
641 | ||
642 | tag_flag = 0; | |
643 | if (flags & 1) | |
f7f4bccb | 644 | tag_flag |= JBD2_FLAG_ESCAPE; |
470decc6 | 645 | if (!first_tag) |
f7f4bccb | 646 | tag_flag |= JBD2_FLAG_SAME_UUID; |
470decc6 DK |
647 | |
648 | tag = (journal_block_tag_t *) tagp; | |
b517bea1 | 649 | write_tag_block(tag_bytes, tag, jh2bh(jh)->b_blocknr); |
470decc6 | 650 | tag->t_flags = cpu_to_be32(tag_flag); |
b517bea1 ZB |
651 | tagp += tag_bytes; |
652 | space_left -= tag_bytes; | |
470decc6 DK |
653 | |
654 | if (first_tag) { | |
655 | memcpy (tagp, journal->j_uuid, 16); | |
656 | tagp += 16; | |
657 | space_left -= 16; | |
658 | first_tag = 0; | |
659 | } | |
660 | ||
661 | /* If there's no more to do, or if the descriptor is full, | |
662 | let the IO rip! */ | |
663 | ||
664 | if (bufs == journal->j_wbufsize || | |
665 | commit_transaction->t_buffers == NULL || | |
b517bea1 | 666 | space_left < tag_bytes + 16) { |
470decc6 DK |
667 | |
668 | jbd_debug(4, "JBD: Submit %d IOs\n", bufs); | |
669 | ||
670 | /* Write an end-of-descriptor marker before | |
671 | submitting the IOs. "tag" still points to | |
672 | the last tag we set up. */ | |
673 | ||
f7f4bccb | 674 | tag->t_flags |= cpu_to_be32(JBD2_FLAG_LAST_TAG); |
470decc6 DK |
675 | |
676 | start_journal_io: | |
677 | for (i = 0; i < bufs; i++) { | |
678 | struct buffer_head *bh = wbuf[i]; | |
818d276c GS |
679 | /* |
680 | * Compute checksum. | |
681 | */ | |
682 | if (JBD2_HAS_COMPAT_FEATURE(journal, | |
683 | JBD2_FEATURE_COMPAT_CHECKSUM)) { | |
684 | crc32_sum = | |
685 | jbd2_checksum_data(crc32_sum, bh); | |
686 | } | |
687 | ||
470decc6 DK |
688 | lock_buffer(bh); |
689 | clear_buffer_dirty(bh); | |
690 | set_buffer_uptodate(bh); | |
691 | bh->b_end_io = journal_end_buffer_io_sync; | |
7058548c | 692 | submit_bh(write_op, bh); |
470decc6 DK |
693 | } |
694 | cond_resched(); | |
bf699327 | 695 | stats.run.rs_blocks_logged += bufs; |
470decc6 DK |
696 | |
697 | /* Force a new descriptor to be generated next | |
698 | time round the loop. */ | |
699 | descriptor = NULL; | |
700 | bufs = 0; | |
701 | } | |
702 | } | |
703 | ||
cc3e1bea TT |
704 | /* |
705 | * If the journal is not located on the file system device, | |
706 | * then we must flush the file system device before we issue | |
707 | * the commit record | |
708 | */ | |
709 | if (commit_transaction->t_flushed_data_blocks && | |
710 | (journal->j_fs_dev != journal->j_dev) && | |
711 | (journal->j_flags & JBD2_BARRIER)) | |
fbd9b09a DM |
712 | blkdev_issue_flush(journal->j_fs_dev, GFP_KERNEL, NULL, |
713 | BLKDEV_IFL_WAIT); | |
818d276c | 714 | |
cc3e1bea | 715 | /* Done it all: now write the commit record asynchronously. */ |
818d276c | 716 | if (JBD2_HAS_INCOMPAT_FEATURE(journal, |
0e3d2a63 | 717 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { |
818d276c GS |
718 | err = journal_submit_commit_record(journal, commit_transaction, |
719 | &cbh, crc32_sum); | |
720 | if (err) | |
721 | __jbd2_journal_abort_hard(journal); | |
0e3d2a63 | 722 | if (journal->j_flags & JBD2_BARRIER) |
fbd9b09a DM |
723 | blkdev_issue_flush(journal->j_dev, GFP_KERNEL, NULL, |
724 | BLKDEV_IFL_WAIT); | |
818d276c GS |
725 | } |
726 | ||
c851ed54 | 727 | err = journal_finish_inode_data_buffers(journal, commit_transaction); |
e9e34f4e | 728 | if (err) { |
e9e34f4e HK |
729 | printk(KERN_WARNING |
730 | "JBD2: Detected IO errors while flushing file data " | |
05496769 | 731 | "on %s\n", journal->j_devname); |
5bf5683a HK |
732 | if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR) |
733 | jbd2_journal_abort(journal, err); | |
e9e34f4e HK |
734 | err = 0; |
735 | } | |
c851ed54 | 736 | |
470decc6 DK |
737 | /* Lo and behold: we have just managed to send a transaction to |
738 | the log. Before we can commit it, wait for the IO so far to | |
739 | complete. Control buffers being written are on the | |
740 | transaction's t_log_list queue, and metadata buffers are on | |
741 | the t_iobuf_list queue. | |
742 | ||
743 | Wait for the buffers in reverse order. That way we are | |
744 | less likely to be woken up until all IOs have completed, and | |
745 | so we incur less scheduling load. | |
746 | */ | |
747 | ||
87c89c23 | 748 | jbd_debug(3, "JBD: commit phase 3\n"); |
470decc6 DK |
749 | |
750 | /* | |
751 | * akpm: these are BJ_IO, and j_list_lock is not needed. | |
752 | * See __journal_try_to_free_buffer. | |
753 | */ | |
754 | wait_for_iobuf: | |
755 | while (commit_transaction->t_iobuf_list != NULL) { | |
756 | struct buffer_head *bh; | |
757 | ||
758 | jh = commit_transaction->t_iobuf_list->b_tprev; | |
759 | bh = jh2bh(jh); | |
760 | if (buffer_locked(bh)) { | |
761 | wait_on_buffer(bh); | |
762 | goto wait_for_iobuf; | |
763 | } | |
764 | if (cond_resched()) | |
765 | goto wait_for_iobuf; | |
766 | ||
767 | if (unlikely(!buffer_uptodate(bh))) | |
768 | err = -EIO; | |
769 | ||
770 | clear_buffer_jwrite(bh); | |
771 | ||
772 | JBUFFER_TRACE(jh, "ph4: unfile after journal write"); | |
f7f4bccb | 773 | jbd2_journal_unfile_buffer(journal, jh); |
470decc6 DK |
774 | |
775 | /* | |
776 | * ->t_iobuf_list should contain only dummy buffer_heads | |
f7f4bccb | 777 | * which were created by jbd2_journal_write_metadata_buffer(). |
470decc6 DK |
778 | */ |
779 | BUFFER_TRACE(bh, "dumping temporary bh"); | |
f7f4bccb | 780 | jbd2_journal_put_journal_head(jh); |
470decc6 DK |
781 | __brelse(bh); |
782 | J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0); | |
783 | free_buffer_head(bh); | |
784 | ||
785 | /* We also have to unlock and free the corresponding | |
786 | shadowed buffer */ | |
787 | jh = commit_transaction->t_shadow_list->b_tprev; | |
788 | bh = jh2bh(jh); | |
789 | clear_bit(BH_JWrite, &bh->b_state); | |
790 | J_ASSERT_BH(bh, buffer_jbddirty(bh)); | |
791 | ||
792 | /* The metadata is now released for reuse, but we need | |
793 | to remember it against this transaction so that when | |
794 | we finally commit, we can do any checkpointing | |
795 | required. */ | |
796 | JBUFFER_TRACE(jh, "file as BJ_Forget"); | |
f7f4bccb | 797 | jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget); |
470decc6 DK |
798 | /* Wake up any transactions which were waiting for this |
799 | IO to complete */ | |
800 | wake_up_bit(&bh->b_state, BH_Unshadow); | |
801 | JBUFFER_TRACE(jh, "brelse shadowed buffer"); | |
802 | __brelse(bh); | |
803 | } | |
804 | ||
805 | J_ASSERT (commit_transaction->t_shadow_list == NULL); | |
806 | ||
87c89c23 | 807 | jbd_debug(3, "JBD: commit phase 4\n"); |
470decc6 DK |
808 | |
809 | /* Here we wait for the revoke record and descriptor record buffers */ | |
810 | wait_for_ctlbuf: | |
811 | while (commit_transaction->t_log_list != NULL) { | |
812 | struct buffer_head *bh; | |
813 | ||
814 | jh = commit_transaction->t_log_list->b_tprev; | |
815 | bh = jh2bh(jh); | |
816 | if (buffer_locked(bh)) { | |
817 | wait_on_buffer(bh); | |
818 | goto wait_for_ctlbuf; | |
819 | } | |
820 | if (cond_resched()) | |
821 | goto wait_for_ctlbuf; | |
822 | ||
823 | if (unlikely(!buffer_uptodate(bh))) | |
824 | err = -EIO; | |
825 | ||
826 | BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile"); | |
827 | clear_buffer_jwrite(bh); | |
f7f4bccb MC |
828 | jbd2_journal_unfile_buffer(journal, jh); |
829 | jbd2_journal_put_journal_head(jh); | |
470decc6 DK |
830 | __brelse(bh); /* One for getblk */ |
831 | /* AKPM: bforget here */ | |
832 | } | |
833 | ||
77e841de HK |
834 | if (err) |
835 | jbd2_journal_abort(journal, err); | |
836 | ||
87c89c23 | 837 | jbd_debug(3, "JBD: commit phase 5\n"); |
470decc6 | 838 | |
818d276c | 839 | if (!JBD2_HAS_INCOMPAT_FEATURE(journal, |
0e3d2a63 | 840 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { |
818d276c GS |
841 | err = journal_submit_commit_record(journal, commit_transaction, |
842 | &cbh, crc32_sum); | |
843 | if (err) | |
844 | __jbd2_journal_abort_hard(journal); | |
845 | } | |
b048d846 | 846 | if (!err && !is_journal_aborted(journal)) |
fd98496f | 847 | err = journal_wait_on_commit_record(journal, cbh); |
470decc6 DK |
848 | |
849 | if (err) | |
a7fa2baf | 850 | jbd2_journal_abort(journal, err); |
470decc6 DK |
851 | |
852 | /* End of a transaction! Finally, we can do checkpoint | |
853 | processing: any buffers committed as a result of this | |
854 | transaction can be removed from any checkpoint list it was on | |
855 | before. */ | |
856 | ||
87c89c23 | 857 | jbd_debug(3, "JBD: commit phase 6\n"); |
470decc6 | 858 | |
c851ed54 | 859 | J_ASSERT(list_empty(&commit_transaction->t_inode_list)); |
470decc6 DK |
860 | J_ASSERT(commit_transaction->t_buffers == NULL); |
861 | J_ASSERT(commit_transaction->t_checkpoint_list == NULL); | |
862 | J_ASSERT(commit_transaction->t_iobuf_list == NULL); | |
863 | J_ASSERT(commit_transaction->t_shadow_list == NULL); | |
864 | J_ASSERT(commit_transaction->t_log_list == NULL); | |
865 | ||
866 | restart_loop: | |
867 | /* | |
868 | * As there are other places (journal_unmap_buffer()) adding buffers | |
869 | * to this list we have to be careful and hold the j_list_lock. | |
870 | */ | |
871 | spin_lock(&journal->j_list_lock); | |
872 | while (commit_transaction->t_forget) { | |
873 | transaction_t *cp_transaction; | |
874 | struct buffer_head *bh; | |
875 | ||
876 | jh = commit_transaction->t_forget; | |
877 | spin_unlock(&journal->j_list_lock); | |
878 | bh = jh2bh(jh); | |
879 | jbd_lock_bh_state(bh); | |
23e2af35 | 880 | J_ASSERT_JH(jh, jh->b_transaction == commit_transaction); |
470decc6 DK |
881 | |
882 | /* | |
883 | * If there is undo-protected committed data against | |
884 | * this buffer, then we can remove it now. If it is a | |
885 | * buffer needing such protection, the old frozen_data | |
886 | * field now points to a committed version of the | |
887 | * buffer, so rotate that field to the new committed | |
888 | * data. | |
889 | * | |
890 | * Otherwise, we can just throw away the frozen data now. | |
e06c8227 JB |
891 | * |
892 | * We also know that the frozen data has already fired | |
893 | * its triggers if they exist, so we can clear that too. | |
470decc6 DK |
894 | */ |
895 | if (jh->b_committed_data) { | |
af1e76d6 | 896 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
897 | jh->b_committed_data = NULL; |
898 | if (jh->b_frozen_data) { | |
899 | jh->b_committed_data = jh->b_frozen_data; | |
900 | jh->b_frozen_data = NULL; | |
e06c8227 | 901 | jh->b_frozen_triggers = NULL; |
470decc6 DK |
902 | } |
903 | } else if (jh->b_frozen_data) { | |
af1e76d6 | 904 | jbd2_free(jh->b_frozen_data, bh->b_size); |
470decc6 | 905 | jh->b_frozen_data = NULL; |
e06c8227 | 906 | jh->b_frozen_triggers = NULL; |
470decc6 DK |
907 | } |
908 | ||
909 | spin_lock(&journal->j_list_lock); | |
910 | cp_transaction = jh->b_cp_transaction; | |
911 | if (cp_transaction) { | |
912 | JBUFFER_TRACE(jh, "remove from old cp transaction"); | |
8e85fb3f | 913 | cp_transaction->t_chp_stats.cs_dropped++; |
f7f4bccb | 914 | __jbd2_journal_remove_checkpoint(jh); |
470decc6 DK |
915 | } |
916 | ||
917 | /* Only re-checkpoint the buffer_head if it is marked | |
918 | * dirty. If the buffer was added to the BJ_Forget list | |
f7f4bccb | 919 | * by jbd2_journal_forget, it may no longer be dirty and |
470decc6 DK |
920 | * there's no point in keeping a checkpoint record for |
921 | * it. */ | |
922 | ||
923 | /* A buffer which has been freed while still being | |
924 | * journaled by a previous transaction may end up still | |
925 | * being dirty here, but we want to avoid writing back | |
ba869023 | 926 | * that buffer in the future after the "add to orphan" |
927 | * operation been committed, That's not only a performance | |
928 | * gain, it also stops aliasing problems if the buffer is | |
929 | * left behind for writeback and gets reallocated for another | |
470decc6 | 930 | * use in a different page. */ |
ba869023 | 931 | if (buffer_freed(bh) && !jh->b_next_transaction) { |
470decc6 DK |
932 | clear_buffer_freed(bh); |
933 | clear_buffer_jbddirty(bh); | |
934 | } | |
935 | ||
936 | if (buffer_jbddirty(bh)) { | |
937 | JBUFFER_TRACE(jh, "add to new checkpointing trans"); | |
f7f4bccb | 938 | __jbd2_journal_insert_checkpoint(jh, commit_transaction); |
7ad7445f HK |
939 | if (is_journal_aborted(journal)) |
940 | clear_buffer_jbddirty(bh); | |
470decc6 | 941 | JBUFFER_TRACE(jh, "refile for checkpoint writeback"); |
f7f4bccb | 942 | __jbd2_journal_refile_buffer(jh); |
470decc6 DK |
943 | jbd_unlock_bh_state(bh); |
944 | } else { | |
945 | J_ASSERT_BH(bh, !buffer_dirty(bh)); | |
946 | /* The buffer on BJ_Forget list and not jbddirty means | |
947 | * it has been freed by this transaction and hence it | |
948 | * could not have been reallocated until this | |
949 | * transaction has committed. *BUT* it could be | |
950 | * reallocated once we have written all the data to | |
951 | * disk and before we process the buffer on BJ_Forget | |
952 | * list. */ | |
953 | JBUFFER_TRACE(jh, "refile or unfile freed buffer"); | |
f7f4bccb | 954 | __jbd2_journal_refile_buffer(jh); |
470decc6 DK |
955 | if (!jh->b_transaction) { |
956 | jbd_unlock_bh_state(bh); | |
957 | /* needs a brelse */ | |
f7f4bccb | 958 | jbd2_journal_remove_journal_head(bh); |
470decc6 DK |
959 | release_buffer_page(bh); |
960 | } else | |
961 | jbd_unlock_bh_state(bh); | |
962 | } | |
963 | cond_resched_lock(&journal->j_list_lock); | |
964 | } | |
965 | spin_unlock(&journal->j_list_lock); | |
966 | /* | |
f5a7a6b0 JK |
967 | * This is a bit sleazy. We use j_list_lock to protect transition |
968 | * of a transaction into T_FINISHED state and calling | |
969 | * __jbd2_journal_drop_transaction(). Otherwise we could race with | |
970 | * other checkpointing code processing the transaction... | |
470decc6 | 971 | */ |
a931da6a | 972 | write_lock(&journal->j_state_lock); |
470decc6 DK |
973 | spin_lock(&journal->j_list_lock); |
974 | /* | |
975 | * Now recheck if some buffers did not get attached to the transaction | |
976 | * while the lock was dropped... | |
977 | */ | |
978 | if (commit_transaction->t_forget) { | |
979 | spin_unlock(&journal->j_list_lock); | |
a931da6a | 980 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
981 | goto restart_loop; |
982 | } | |
983 | ||
984 | /* Done with this transaction! */ | |
985 | ||
87c89c23 | 986 | jbd_debug(3, "JBD: commit phase 7\n"); |
470decc6 DK |
987 | |
988 | J_ASSERT(commit_transaction->t_state == T_COMMIT); | |
989 | ||
8e85fb3f | 990 | commit_transaction->t_start = jiffies; |
bf699327 TT |
991 | stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging, |
992 | commit_transaction->t_start); | |
8e85fb3f JL |
993 | |
994 | /* | |
bf699327 | 995 | * File the transaction statistics |
8e85fb3f | 996 | */ |
8e85fb3f | 997 | stats.ts_tid = commit_transaction->t_tid; |
8dd42046 TT |
998 | stats.run.rs_handle_count = |
999 | atomic_read(&commit_transaction->t_handle_count); | |
bf699327 TT |
1000 | trace_jbd2_run_stats(journal->j_fs_dev->bd_dev, |
1001 | commit_transaction->t_tid, &stats.run); | |
8e85fb3f JL |
1002 | |
1003 | /* | |
1004 | * Calculate overall stats | |
1005 | */ | |
bf699327 | 1006 | spin_lock(&journal->j_history_lock); |
8e85fb3f | 1007 | journal->j_stats.ts_tid++; |
bf699327 TT |
1008 | journal->j_stats.run.rs_wait += stats.run.rs_wait; |
1009 | journal->j_stats.run.rs_running += stats.run.rs_running; | |
1010 | journal->j_stats.run.rs_locked += stats.run.rs_locked; | |
1011 | journal->j_stats.run.rs_flushing += stats.run.rs_flushing; | |
1012 | journal->j_stats.run.rs_logging += stats.run.rs_logging; | |
1013 | journal->j_stats.run.rs_handle_count += stats.run.rs_handle_count; | |
1014 | journal->j_stats.run.rs_blocks += stats.run.rs_blocks; | |
1015 | journal->j_stats.run.rs_blocks_logged += stats.run.rs_blocks_logged; | |
8e85fb3f JL |
1016 | spin_unlock(&journal->j_history_lock); |
1017 | ||
470decc6 DK |
1018 | commit_transaction->t_state = T_FINISHED; |
1019 | J_ASSERT(commit_transaction == journal->j_committing_transaction); | |
1020 | journal->j_commit_sequence = commit_transaction->t_tid; | |
1021 | journal->j_committing_transaction = NULL; | |
e07f7183 | 1022 | commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time)); |
470decc6 | 1023 | |
e07f7183 JB |
1024 | /* |
1025 | * weight the commit time higher than the average time so we don't | |
1026 | * react too strongly to vast changes in the commit time | |
1027 | */ | |
1028 | if (likely(journal->j_average_commit_time)) | |
1029 | journal->j_average_commit_time = (commit_time + | |
1030 | journal->j_average_commit_time*3) / 4; | |
1031 | else | |
1032 | journal->j_average_commit_time = commit_time; | |
a931da6a | 1033 | write_unlock(&journal->j_state_lock); |
6c20ec85 | 1034 | |
f89b7795 JK |
1035 | if (commit_transaction->t_checkpoint_list == NULL && |
1036 | commit_transaction->t_checkpoint_io_list == NULL) { | |
f7f4bccb | 1037 | __jbd2_journal_drop_transaction(journal, commit_transaction); |
fb68407b | 1038 | to_free = 1; |
470decc6 DK |
1039 | } else { |
1040 | if (journal->j_checkpoint_transactions == NULL) { | |
1041 | journal->j_checkpoint_transactions = commit_transaction; | |
1042 | commit_transaction->t_cpnext = commit_transaction; | |
1043 | commit_transaction->t_cpprev = commit_transaction; | |
1044 | } else { | |
1045 | commit_transaction->t_cpnext = | |
1046 | journal->j_checkpoint_transactions; | |
1047 | commit_transaction->t_cpprev = | |
1048 | commit_transaction->t_cpnext->t_cpprev; | |
1049 | commit_transaction->t_cpnext->t_cpprev = | |
1050 | commit_transaction; | |
1051 | commit_transaction->t_cpprev->t_cpnext = | |
1052 | commit_transaction; | |
1053 | } | |
1054 | } | |
1055 | spin_unlock(&journal->j_list_lock); | |
1056 | ||
fb68407b AK |
1057 | if (journal->j_commit_callback) |
1058 | journal->j_commit_callback(journal, commit_transaction); | |
1059 | ||
879c5e6b | 1060 | trace_jbd2_end_commit(journal, commit_transaction); |
470decc6 DK |
1061 | jbd_debug(1, "JBD: commit %d complete, head %d\n", |
1062 | journal->j_commit_sequence, journal->j_tail_sequence); | |
fb68407b AK |
1063 | if (to_free) |
1064 | kfree(commit_transaction); | |
470decc6 DK |
1065 | |
1066 | wake_up(&journal->j_wait_done_commit); | |
1067 | } |