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f5166768 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
470decc6 | 2 | /* |
f7f4bccb | 3 | * linux/fs/jbd2/commit.c |
470decc6 DK |
4 | * |
5 | * Written by Stephen C. Tweedie <sct@redhat.com>, 1998 | |
6 | * | |
7 | * Copyright 1998 Red Hat corp --- All Rights Reserved | |
8 | * | |
470decc6 DK |
9 | * Journal commit routines for the generic filesystem journaling code; |
10 | * part of the ext2fs journaling system. | |
11 | */ | |
12 | ||
13 | #include <linux/time.h> | |
14 | #include <linux/fs.h> | |
f7f4bccb | 15 | #include <linux/jbd2.h> |
470decc6 DK |
16 | #include <linux/errno.h> |
17 | #include <linux/slab.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/pagemap.h> | |
8e85fb3f | 20 | #include <linux/jiffies.h> |
818d276c | 21 | #include <linux/crc32.h> |
cd1aac32 AK |
22 | #include <linux/writeback.h> |
23 | #include <linux/backing-dev.h> | |
fd98496f | 24 | #include <linux/bio.h> |
0e3d2a63 | 25 | #include <linux/blkdev.h> |
39e3ac25 | 26 | #include <linux/bitops.h> |
879c5e6b | 27 | #include <trace/events/jbd2.h> |
470decc6 DK |
28 | |
29 | /* | |
b34090e5 | 30 | * IO end handler for temporary buffer_heads handling writes to the journal. |
470decc6 DK |
31 | */ |
32 | static void journal_end_buffer_io_sync(struct buffer_head *bh, int uptodate) | |
33 | { | |
b34090e5 JK |
34 | struct buffer_head *orig_bh = bh->b_private; |
35 | ||
470decc6 DK |
36 | BUFFER_TRACE(bh, ""); |
37 | if (uptodate) | |
38 | set_buffer_uptodate(bh); | |
39 | else | |
40 | clear_buffer_uptodate(bh); | |
b34090e5 JK |
41 | if (orig_bh) { |
42 | clear_bit_unlock(BH_Shadow, &orig_bh->b_state); | |
4e857c58 | 43 | smp_mb__after_atomic(); |
b34090e5 JK |
44 | wake_up_bit(&orig_bh->b_state, BH_Shadow); |
45 | } | |
470decc6 DK |
46 | unlock_buffer(bh); |
47 | } | |
48 | ||
49 | /* | |
87c89c23 JK |
50 | * When an ext4 file is truncated, it is possible that some pages are not |
51 | * successfully freed, because they are attached to a committing transaction. | |
470decc6 DK |
52 | * After the transaction commits, these pages are left on the LRU, with no |
53 | * ->mapping, and with attached buffers. These pages are trivially reclaimable | |
54 | * by the VM, but their apparent absence upsets the VM accounting, and it makes | |
55 | * the numbers in /proc/meminfo look odd. | |
56 | * | |
57 | * So here, we have a buffer which has just come off the forget list. Look to | |
58 | * see if we can strip all buffers from the backing page. | |
59 | * | |
60 | * Called under lock_journal(), and possibly under journal_datalist_lock. The | |
61 | * caller provided us with a ref against the buffer, and we drop that here. | |
62 | */ | |
63 | static void release_buffer_page(struct buffer_head *bh) | |
64 | { | |
65 | struct page *page; | |
66 | ||
67 | if (buffer_dirty(bh)) | |
68 | goto nope; | |
69 | if (atomic_read(&bh->b_count) != 1) | |
70 | goto nope; | |
71 | page = bh->b_page; | |
72 | if (!page) | |
73 | goto nope; | |
74 | if (page->mapping) | |
75 | goto nope; | |
76 | ||
77 | /* OK, it's a truncated page */ | |
529ae9aa | 78 | if (!trylock_page(page)) |
470decc6 DK |
79 | goto nope; |
80 | ||
09cbfeaf | 81 | get_page(page); |
470decc6 DK |
82 | __brelse(bh); |
83 | try_to_free_buffers(page); | |
84 | unlock_page(page); | |
09cbfeaf | 85 | put_page(page); |
470decc6 DK |
86 | return; |
87 | ||
88 | nope: | |
89 | __brelse(bh); | |
90 | } | |
91 | ||
e5a120ae | 92 | static void jbd2_commit_block_csum_set(journal_t *j, struct buffer_head *bh) |
1f56c589 DW |
93 | { |
94 | struct commit_header *h; | |
95 | __u32 csum; | |
96 | ||
db9ee220 | 97 | if (!jbd2_journal_has_csum_v2or3(j)) |
1f56c589 DW |
98 | return; |
99 | ||
e5a120ae | 100 | h = (struct commit_header *)(bh->b_data); |
1f56c589 DW |
101 | h->h_chksum_type = 0; |
102 | h->h_chksum_size = 0; | |
103 | h->h_chksum[0] = 0; | |
e5a120ae | 104 | csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize); |
1f56c589 DW |
105 | h->h_chksum[0] = cpu_to_be32(csum); |
106 | } | |
107 | ||
818d276c GS |
108 | /* |
109 | * Done it all: now submit the commit record. We should have | |
470decc6 DK |
110 | * cleaned up our previous buffers by now, so if we are in abort |
111 | * mode we can now just skip the rest of the journal write | |
112 | * entirely. | |
113 | * | |
114 | * Returns 1 if the journal needs to be aborted or 0 on success | |
115 | */ | |
818d276c GS |
116 | static int journal_submit_commit_record(journal_t *journal, |
117 | transaction_t *commit_transaction, | |
118 | struct buffer_head **cbh, | |
119 | __u32 crc32_sum) | |
470decc6 | 120 | { |
818d276c | 121 | struct commit_header *tmp; |
470decc6 | 122 | struct buffer_head *bh; |
818d276c | 123 | int ret; |
b42d1d6b | 124 | struct timespec64 now; |
470decc6 | 125 | |
6cba611e ZH |
126 | *cbh = NULL; |
127 | ||
470decc6 DK |
128 | if (is_journal_aborted(journal)) |
129 | return 0; | |
130 | ||
32ab6715 JK |
131 | bh = jbd2_journal_get_descriptor_buffer(commit_transaction, |
132 | JBD2_COMMIT_BLOCK); | |
e5a120ae | 133 | if (!bh) |
470decc6 DK |
134 | return 1; |
135 | ||
818d276c | 136 | tmp = (struct commit_header *)bh->b_data; |
b42d1d6b | 137 | ktime_get_coarse_real_ts64(&now); |
736603ab TT |
138 | tmp->h_commit_sec = cpu_to_be64(now.tv_sec); |
139 | tmp->h_commit_nsec = cpu_to_be32(now.tv_nsec); | |
818d276c | 140 | |
56316a0d | 141 | if (jbd2_has_feature_checksum(journal)) { |
818d276c GS |
142 | tmp->h_chksum_type = JBD2_CRC32_CHKSUM; |
143 | tmp->h_chksum_size = JBD2_CRC32_CHKSUM_SIZE; | |
144 | tmp->h_chksum[0] = cpu_to_be32(crc32_sum); | |
470decc6 | 145 | } |
e5a120ae | 146 | jbd2_commit_block_csum_set(journal, bh); |
470decc6 | 147 | |
e5a120ae | 148 | BUFFER_TRACE(bh, "submit commit block"); |
818d276c | 149 | lock_buffer(bh); |
45a90bfd | 150 | clear_buffer_dirty(bh); |
818d276c GS |
151 | set_buffer_uptodate(bh); |
152 | bh->b_end_io = journal_end_buffer_io_sync; | |
153 | ||
154 | if (journal->j_flags & JBD2_BARRIER && | |
56316a0d | 155 | !jbd2_has_feature_async_commit(journal)) |
70fd7614 CH |
156 | ret = submit_bh(REQ_OP_WRITE, |
157 | REQ_SYNC | REQ_PREFLUSH | REQ_FUA, bh); | |
9c35575b | 158 | else |
70fd7614 | 159 | ret = submit_bh(REQ_OP_WRITE, REQ_SYNC, bh); |
9c35575b | 160 | |
818d276c GS |
161 | *cbh = bh; |
162 | return ret; | |
163 | } | |
164 | ||
165 | /* | |
166 | * This function along with journal_submit_commit_record | |
167 | * allows to write the commit record asynchronously. | |
168 | */ | |
fd98496f TT |
169 | static int journal_wait_on_commit_record(journal_t *journal, |
170 | struct buffer_head *bh) | |
818d276c GS |
171 | { |
172 | int ret = 0; | |
173 | ||
174 | clear_buffer_dirty(bh); | |
175 | wait_on_buffer(bh); | |
470decc6 | 176 | |
818d276c GS |
177 | if (unlikely(!buffer_uptodate(bh))) |
178 | ret = -EIO; | |
179 | put_bh(bh); /* One for getblk() */ | |
818d276c GS |
180 | |
181 | return ret; | |
470decc6 DK |
182 | } |
183 | ||
cd1aac32 AK |
184 | /* |
185 | * write the filemap data using writepage() address_space_operations. | |
186 | * We don't do block allocation here even for delalloc. We don't | |
187 | * use writepages() because with dealyed allocation we may be doing | |
188 | * block allocation in writepages(). | |
189 | */ | |
190 | static int journal_submit_inode_data_buffers(struct address_space *mapping) | |
191 | { | |
192 | int ret; | |
193 | struct writeback_control wbc = { | |
194 | .sync_mode = WB_SYNC_ALL, | |
195 | .nr_to_write = mapping->nrpages * 2, | |
196 | .range_start = 0, | |
197 | .range_end = i_size_read(mapping->host), | |
cd1aac32 AK |
198 | }; |
199 | ||
200 | ret = generic_writepages(mapping, &wbc); | |
201 | return ret; | |
202 | } | |
203 | ||
c851ed54 JK |
204 | /* |
205 | * Submit all the data buffers of inode associated with the transaction to | |
206 | * disk. | |
207 | * | |
208 | * We are in a committing transaction. Therefore no new inode can be added to | |
209 | * our inode list. We use JI_COMMIT_RUNNING flag to protect inode we currently | |
210 | * operate on from being released while we write out pages. | |
211 | */ | |
cd1aac32 | 212 | static int journal_submit_data_buffers(journal_t *journal, |
c851ed54 JK |
213 | transaction_t *commit_transaction) |
214 | { | |
215 | struct jbd2_inode *jinode; | |
216 | int err, ret = 0; | |
217 | struct address_space *mapping; | |
218 | ||
219 | spin_lock(&journal->j_list_lock); | |
220 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { | |
41617e1a JK |
221 | if (!(jinode->i_flags & JI_WRITE_DATA)) |
222 | continue; | |
c851ed54 | 223 | mapping = jinode->i_vfs_inode->i_mapping; |
cb0d9d47 | 224 | jinode->i_flags |= JI_COMMIT_RUNNING; |
c851ed54 | 225 | spin_unlock(&journal->j_list_lock); |
cd1aac32 AK |
226 | /* |
227 | * submit the inode data buffers. We use writepage | |
228 | * instead of writepages. Because writepages can do | |
229 | * block allocation with delalloc. We need to write | |
230 | * only allocated blocks here. | |
231 | */ | |
879c5e6b | 232 | trace_jbd2_submit_inode_data(jinode->i_vfs_inode); |
cd1aac32 | 233 | err = journal_submit_inode_data_buffers(mapping); |
c851ed54 JK |
234 | if (!ret) |
235 | ret = err; | |
236 | spin_lock(&journal->j_list_lock); | |
237 | J_ASSERT(jinode->i_transaction == commit_transaction); | |
cb0d9d47 JK |
238 | jinode->i_flags &= ~JI_COMMIT_RUNNING; |
239 | smp_mb(); | |
c851ed54 JK |
240 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); |
241 | } | |
242 | spin_unlock(&journal->j_list_lock); | |
243 | return ret; | |
244 | } | |
245 | ||
246 | /* | |
247 | * Wait for data submitted for writeout, refile inodes to proper | |
248 | * transaction if needed. | |
249 | * | |
250 | */ | |
251 | static int journal_finish_inode_data_buffers(journal_t *journal, | |
252 | transaction_t *commit_transaction) | |
253 | { | |
254 | struct jbd2_inode *jinode, *next_i; | |
255 | int err, ret = 0; | |
256 | ||
cd1aac32 | 257 | /* For locking, see the comment in journal_submit_data_buffers() */ |
c851ed54 JK |
258 | spin_lock(&journal->j_list_lock); |
259 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { | |
41617e1a JK |
260 | if (!(jinode->i_flags & JI_WAIT_DATA)) |
261 | continue; | |
cb0d9d47 | 262 | jinode->i_flags |= JI_COMMIT_RUNNING; |
c851ed54 | 263 | spin_unlock(&journal->j_list_lock); |
76341cab JL |
264 | err = filemap_fdatawait_keep_errors( |
265 | jinode->i_vfs_inode->i_mapping); | |
266 | if (!ret) | |
267 | ret = err; | |
c851ed54 | 268 | spin_lock(&journal->j_list_lock); |
cb0d9d47 JK |
269 | jinode->i_flags &= ~JI_COMMIT_RUNNING; |
270 | smp_mb(); | |
c851ed54 JK |
271 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); |
272 | } | |
273 | ||
274 | /* Now refile inode to proper lists */ | |
275 | list_for_each_entry_safe(jinode, next_i, | |
276 | &commit_transaction->t_inode_list, i_list) { | |
277 | list_del(&jinode->i_list); | |
278 | if (jinode->i_next_transaction) { | |
279 | jinode->i_transaction = jinode->i_next_transaction; | |
280 | jinode->i_next_transaction = NULL; | |
281 | list_add(&jinode->i_list, | |
282 | &jinode->i_transaction->t_inode_list); | |
283 | } else { | |
284 | jinode->i_transaction = NULL; | |
285 | } | |
286 | } | |
287 | spin_unlock(&journal->j_list_lock); | |
288 | ||
289 | return ret; | |
290 | } | |
291 | ||
818d276c GS |
292 | static __u32 jbd2_checksum_data(__u32 crc32_sum, struct buffer_head *bh) |
293 | { | |
294 | struct page *page = bh->b_page; | |
295 | char *addr; | |
296 | __u32 checksum; | |
297 | ||
303a8f2a | 298 | addr = kmap_atomic(page); |
818d276c GS |
299 | checksum = crc32_be(crc32_sum, |
300 | (void *)(addr + offset_in_page(bh->b_data)), bh->b_size); | |
303a8f2a | 301 | kunmap_atomic(addr); |
818d276c GS |
302 | |
303 | return checksum; | |
304 | } | |
305 | ||
db9ee220 | 306 | static void write_tag_block(journal_t *j, journal_block_tag_t *tag, |
18eba7aa | 307 | unsigned long long block) |
b517bea1 ZB |
308 | { |
309 | tag->t_blocknr = cpu_to_be32(block & (u32)~0); | |
56316a0d | 310 | if (jbd2_has_feature_64bit(j)) |
b517bea1 ZB |
311 | tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1); |
312 | } | |
313 | ||
c3900875 DW |
314 | static void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag, |
315 | struct buffer_head *bh, __u32 sequence) | |
316 | { | |
db9ee220 | 317 | journal_block_tag3_t *tag3 = (journal_block_tag3_t *)tag; |
c3900875 DW |
318 | struct page *page = bh->b_page; |
319 | __u8 *addr; | |
eee06c56 | 320 | __u32 csum32; |
18a6ea1e | 321 | __be32 seq; |
c3900875 | 322 | |
db9ee220 | 323 | if (!jbd2_journal_has_csum_v2or3(j)) |
c3900875 DW |
324 | return; |
325 | ||
18a6ea1e | 326 | seq = cpu_to_be32(sequence); |
906adea1 | 327 | addr = kmap_atomic(page); |
18a6ea1e | 328 | csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&seq, sizeof(seq)); |
eee06c56 DW |
329 | csum32 = jbd2_chksum(j, csum32, addr + offset_in_page(bh->b_data), |
330 | bh->b_size); | |
906adea1 | 331 | kunmap_atomic(addr); |
c3900875 | 332 | |
56316a0d | 333 | if (jbd2_has_feature_csum3(j)) |
db9ee220 DW |
334 | tag3->t_checksum = cpu_to_be32(csum32); |
335 | else | |
336 | tag->t_checksum = cpu_to_be16(csum32); | |
c3900875 | 337 | } |
470decc6 | 338 | /* |
f7f4bccb | 339 | * jbd2_journal_commit_transaction |
470decc6 DK |
340 | * |
341 | * The primary function for committing a transaction to the log. This | |
342 | * function is called by the journal thread to begin a complete commit. | |
343 | */ | |
f7f4bccb | 344 | void jbd2_journal_commit_transaction(journal_t *journal) |
470decc6 | 345 | { |
8e85fb3f | 346 | struct transaction_stats_s stats; |
470decc6 | 347 | transaction_t *commit_transaction; |
e5a120ae JK |
348 | struct journal_head *jh; |
349 | struct buffer_head *descriptor; | |
470decc6 DK |
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 | 357 | char *tagp = NULL; |
470decc6 DK |
358 | journal_block_tag_t *tag = NULL; |
359 | int space_left = 0; | |
360 | int first_tag = 0; | |
361 | int tag_flag; | |
794446c6 | 362 | int i; |
b517bea1 | 363 | int tag_bytes = journal_tag_bytes(journal); |
818d276c GS |
364 | struct buffer_head *cbh = NULL; /* For transactional checksums */ |
365 | __u32 crc32_sum = ~0; | |
82f04ab4 | 366 | struct blk_plug plug; |
3339578f JK |
367 | /* Tail of the journal */ |
368 | unsigned long first_block; | |
369 | tid_t first_tid; | |
370 | int update_tail; | |
3caa487f | 371 | int csum_size = 0; |
f5113eff | 372 | LIST_HEAD(io_bufs); |
e5a120ae | 373 | LIST_HEAD(log_bufs); |
3caa487f | 374 | |
db9ee220 | 375 | if (jbd2_journal_has_csum_v2or3(journal)) |
3caa487f | 376 | csum_size = sizeof(struct jbd2_journal_block_tail); |
470decc6 DK |
377 | |
378 | /* | |
379 | * First job: lock down the current transaction and wait for | |
380 | * all outstanding updates to complete. | |
381 | */ | |
382 | ||
f7f4bccb MC |
383 | /* Do we need to erase the effects of a prior jbd2_journal_flush? */ |
384 | if (journal->j_flags & JBD2_FLUSHED) { | |
470decc6 | 385 | jbd_debug(3, "super block updated\n"); |
6fa7aa50 | 386 | mutex_lock_io(&journal->j_checkpoint_mutex); |
79feb521 JK |
387 | /* |
388 | * We hold j_checkpoint_mutex so tail cannot change under us. | |
389 | * We don't need any special data guarantees for writing sb | |
390 | * since journal is empty and it is ok for write to be | |
391 | * flushed only with transaction commit. | |
392 | */ | |
393 | jbd2_journal_update_sb_log_tail(journal, | |
394 | journal->j_tail_sequence, | |
395 | journal->j_tail, | |
70fd7614 | 396 | REQ_SYNC); |
a78bb11d | 397 | mutex_unlock(&journal->j_checkpoint_mutex); |
470decc6 DK |
398 | } else { |
399 | jbd_debug(3, "superblock not updated\n"); | |
400 | } | |
401 | ||
402 | J_ASSERT(journal->j_running_transaction != NULL); | |
403 | J_ASSERT(journal->j_committing_transaction == NULL); | |
404 | ||
405 | commit_transaction = journal->j_running_transaction; | |
470decc6 | 406 | |
879c5e6b | 407 | trace_jbd2_start_commit(journal, commit_transaction); |
f2a44523 | 408 | jbd_debug(1, "JBD2: starting commit of transaction %d\n", |
470decc6 DK |
409 | commit_transaction->t_tid); |
410 | ||
a931da6a | 411 | write_lock(&journal->j_state_lock); |
3ca841c1 | 412 | J_ASSERT(commit_transaction->t_state == T_RUNNING); |
470decc6 DK |
413 | commit_transaction->t_state = T_LOCKED; |
414 | ||
879c5e6b | 415 | trace_jbd2_commit_locking(journal, commit_transaction); |
bf699327 | 416 | stats.run.rs_wait = commit_transaction->t_max_wait; |
9fff24aa | 417 | stats.run.rs_request_delay = 0; |
bf699327 | 418 | stats.run.rs_locked = jiffies; |
9fff24aa TT |
419 | if (commit_transaction->t_requested) |
420 | stats.run.rs_request_delay = | |
421 | jbd2_time_diff(commit_transaction->t_requested, | |
422 | stats.run.rs_locked); | |
bf699327 TT |
423 | stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start, |
424 | stats.run.rs_locked); | |
8e85fb3f | 425 | |
470decc6 | 426 | spin_lock(&commit_transaction->t_handle_lock); |
a51dca9c | 427 | while (atomic_read(&commit_transaction->t_updates)) { |
470decc6 DK |
428 | DEFINE_WAIT(wait); |
429 | ||
430 | prepare_to_wait(&journal->j_wait_updates, &wait, | |
431 | TASK_UNINTERRUPTIBLE); | |
a51dca9c | 432 | if (atomic_read(&commit_transaction->t_updates)) { |
470decc6 | 433 | spin_unlock(&commit_transaction->t_handle_lock); |
a931da6a | 434 | write_unlock(&journal->j_state_lock); |
470decc6 | 435 | schedule(); |
a931da6a | 436 | write_lock(&journal->j_state_lock); |
470decc6 DK |
437 | spin_lock(&commit_transaction->t_handle_lock); |
438 | } | |
439 | finish_wait(&journal->j_wait_updates, &wait); | |
440 | } | |
441 | spin_unlock(&commit_transaction->t_handle_lock); | |
96f1e097 JK |
442 | commit_transaction->t_state = T_SWITCH; |
443 | write_unlock(&journal->j_state_lock); | |
470decc6 | 444 | |
a51dca9c | 445 | J_ASSERT (atomic_read(&commit_transaction->t_outstanding_credits) <= |
470decc6 DK |
446 | journal->j_max_transaction_buffers); |
447 | ||
448 | /* | |
449 | * First thing we are allowed to do is to discard any remaining | |
450 | * BJ_Reserved buffers. Note, it is _not_ permissible to assume | |
451 | * that there are no such buffers: if a large filesystem | |
452 | * operation like a truncate needs to split itself over multiple | |
f7f4bccb | 453 | * transactions, then it may try to do a jbd2_journal_restart() while |
470decc6 DK |
454 | * there are still BJ_Reserved buffers outstanding. These must |
455 | * be released cleanly from the current transaction. | |
456 | * | |
457 | * In this case, the filesystem must still reserve write access | |
458 | * again before modifying the buffer in the new transaction, but | |
459 | * we do not require it to remember exactly which old buffers it | |
460 | * has reserved. This is consistent with the existing behaviour | |
f7f4bccb | 461 | * that multiple jbd2_journal_get_write_access() calls to the same |
25985edc | 462 | * buffer are perfectly permissible. |
470decc6 DK |
463 | */ |
464 | while (commit_transaction->t_reserved_list) { | |
465 | jh = commit_transaction->t_reserved_list; | |
466 | JBUFFER_TRACE(jh, "reserved, unused: refile"); | |
467 | /* | |
f7f4bccb | 468 | * A jbd2_journal_get_undo_access()+jbd2_journal_release_buffer() may |
470decc6 DK |
469 | * leave undo-committed data. |
470 | */ | |
471 | if (jh->b_committed_data) { | |
472 | struct buffer_head *bh = jh2bh(jh); | |
473 | ||
474 | jbd_lock_bh_state(bh); | |
af1e76d6 | 475 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
476 | jh->b_committed_data = NULL; |
477 | jbd_unlock_bh_state(bh); | |
478 | } | |
f7f4bccb | 479 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
480 | } |
481 | ||
482 | /* | |
483 | * Now try to drop any written-back buffers from the journal's | |
484 | * checkpoint lists. We do this *before* commit because it potentially | |
485 | * frees some memory | |
486 | */ | |
487 | spin_lock(&journal->j_list_lock); | |
841df7df | 488 | __jbd2_journal_clean_checkpoint_list(journal, false); |
470decc6 DK |
489 | spin_unlock(&journal->j_list_lock); |
490 | ||
f2a44523 | 491 | jbd_debug(3, "JBD2: commit phase 1\n"); |
470decc6 | 492 | |
1ba37268 YY |
493 | /* |
494 | * Clear revoked flag to reflect there is no revoked buffers | |
495 | * in the next transaction which is going to be started. | |
496 | */ | |
497 | jbd2_clear_buffer_revoked_flags(journal); | |
498 | ||
470decc6 DK |
499 | /* |
500 | * Switch to a new revoke table. | |
501 | */ | |
f7f4bccb | 502 | jbd2_journal_switch_revoke_table(journal); |
470decc6 | 503 | |
8f7d89f3 JK |
504 | /* |
505 | * Reserved credits cannot be claimed anymore, free them | |
506 | */ | |
507 | atomic_sub(atomic_read(&journal->j_reserved_credits), | |
508 | &commit_transaction->t_outstanding_credits); | |
509 | ||
96f1e097 | 510 | write_lock(&journal->j_state_lock); |
879c5e6b | 511 | trace_jbd2_commit_flushing(journal, commit_transaction); |
bf699327 TT |
512 | stats.run.rs_flushing = jiffies; |
513 | stats.run.rs_locked = jbd2_time_diff(stats.run.rs_locked, | |
514 | stats.run.rs_flushing); | |
8e85fb3f | 515 | |
470decc6 DK |
516 | commit_transaction->t_state = T_FLUSH; |
517 | journal->j_committing_transaction = commit_transaction; | |
518 | journal->j_running_transaction = NULL; | |
e07f7183 | 519 | start_time = ktime_get(); |
470decc6 DK |
520 | commit_transaction->t_log_start = journal->j_head; |
521 | wake_up(&journal->j_wait_transaction_locked); | |
a931da6a | 522 | write_unlock(&journal->j_state_lock); |
470decc6 | 523 | |
cfc7bc89 | 524 | jbd_debug(3, "JBD2: commit phase 2a\n"); |
470decc6 | 525 | |
470decc6 DK |
526 | /* |
527 | * Now start flushing things to disk, in the order they appear | |
528 | * on the transaction lists. Data blocks go first. | |
529 | */ | |
cd1aac32 | 530 | err = journal_submit_data_buffers(journal, commit_transaction); |
470decc6 | 531 | if (err) |
a7fa2baf | 532 | jbd2_journal_abort(journal, err); |
470decc6 | 533 | |
82f04ab4 | 534 | blk_start_plug(&plug); |
9bcf976c | 535 | jbd2_journal_write_revoke_records(commit_transaction, &log_bufs); |
470decc6 | 536 | |
cfc7bc89 | 537 | jbd_debug(3, "JBD2: commit phase 2b\n"); |
470decc6 | 538 | |
470decc6 DK |
539 | /* |
540 | * Way to go: we have now written out all of the data for a | |
541 | * transaction! Now comes the tricky part: we need to write out | |
542 | * metadata. Loop over the transaction's entire buffer list: | |
543 | */ | |
a931da6a | 544 | write_lock(&journal->j_state_lock); |
470decc6 | 545 | commit_transaction->t_state = T_COMMIT; |
a931da6a | 546 | write_unlock(&journal->j_state_lock); |
470decc6 | 547 | |
879c5e6b | 548 | trace_jbd2_commit_logging(journal, commit_transaction); |
bf699327 TT |
549 | stats.run.rs_logging = jiffies; |
550 | stats.run.rs_flushing = jbd2_time_diff(stats.run.rs_flushing, | |
551 | stats.run.rs_logging); | |
a51dca9c TT |
552 | stats.run.rs_blocks = |
553 | atomic_read(&commit_transaction->t_outstanding_credits); | |
bf699327 | 554 | stats.run.rs_blocks_logged = 0; |
8e85fb3f | 555 | |
1dfc3220 | 556 | J_ASSERT(commit_transaction->t_nr_buffers <= |
a51dca9c | 557 | atomic_read(&commit_transaction->t_outstanding_credits)); |
1dfc3220 | 558 | |
87c89c23 | 559 | err = 0; |
470decc6 | 560 | bufs = 0; |
e5a120ae | 561 | descriptor = NULL; |
470decc6 DK |
562 | while (commit_transaction->t_buffers) { |
563 | ||
564 | /* Find the next buffer to be journaled... */ | |
565 | ||
566 | jh = commit_transaction->t_buffers; | |
567 | ||
568 | /* If we're in abort mode, we just un-journal the buffer and | |
7ad7445f | 569 | release it. */ |
470decc6 DK |
570 | |
571 | if (is_journal_aborted(journal)) { | |
7ad7445f | 572 | clear_buffer_jbddirty(jh2bh(jh)); |
470decc6 | 573 | JBUFFER_TRACE(jh, "journal is aborting: refile"); |
e06c8227 JB |
574 | jbd2_buffer_abort_trigger(jh, |
575 | jh->b_frozen_data ? | |
576 | jh->b_frozen_triggers : | |
577 | jh->b_triggers); | |
f7f4bccb | 578 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
579 | /* If that was the last one, we need to clean up |
580 | * any descriptor buffers which may have been | |
581 | * already allocated, even if we are now | |
582 | * aborting. */ | |
583 | if (!commit_transaction->t_buffers) | |
584 | goto start_journal_io; | |
585 | continue; | |
586 | } | |
587 | ||
588 | /* Make sure we have a descriptor block in which to | |
589 | record the metadata buffer. */ | |
590 | ||
591 | if (!descriptor) { | |
470decc6 DK |
592 | J_ASSERT (bufs == 0); |
593 | ||
f2a44523 | 594 | jbd_debug(4, "JBD2: get descriptor\n"); |
470decc6 | 595 | |
32ab6715 JK |
596 | descriptor = jbd2_journal_get_descriptor_buffer( |
597 | commit_transaction, | |
598 | JBD2_DESCRIPTOR_BLOCK); | |
470decc6 | 599 | if (!descriptor) { |
a7fa2baf | 600 | jbd2_journal_abort(journal, -EIO); |
470decc6 DK |
601 | continue; |
602 | } | |
603 | ||
f2a44523 | 604 | jbd_debug(4, "JBD2: got buffer %llu (%p)\n", |
e5a120ae JK |
605 | (unsigned long long)descriptor->b_blocknr, |
606 | descriptor->b_data); | |
e5a120ae JK |
607 | tagp = &descriptor->b_data[sizeof(journal_header_t)]; |
608 | space_left = descriptor->b_size - | |
609 | sizeof(journal_header_t); | |
470decc6 | 610 | first_tag = 1; |
e5a120ae JK |
611 | set_buffer_jwrite(descriptor); |
612 | set_buffer_dirty(descriptor); | |
613 | wbuf[bufs++] = descriptor; | |
470decc6 DK |
614 | |
615 | /* Record it so that we can wait for IO | |
616 | completion later */ | |
e5a120ae JK |
617 | BUFFER_TRACE(descriptor, "ph3: file as descriptor"); |
618 | jbd2_file_log_bh(&log_bufs, descriptor); | |
470decc6 DK |
619 | } |
620 | ||
621 | /* Where is the buffer to be written? */ | |
622 | ||
f7f4bccb | 623 | err = jbd2_journal_next_log_block(journal, &blocknr); |
470decc6 DK |
624 | /* If the block mapping failed, just abandon the buffer |
625 | and repeat this loop: we'll fall into the | |
626 | refile-on-abort condition above. */ | |
627 | if (err) { | |
a7fa2baf | 628 | jbd2_journal_abort(journal, err); |
470decc6 DK |
629 | continue; |
630 | } | |
631 | ||
632 | /* | |
633 | * start_this_handle() uses t_outstanding_credits to determine | |
634 | * the free space in the log, but this counter is changed | |
f7f4bccb | 635 | * by jbd2_journal_next_log_block() also. |
470decc6 | 636 | */ |
a51dca9c | 637 | atomic_dec(&commit_transaction->t_outstanding_credits); |
470decc6 DK |
638 | |
639 | /* Bump b_count to prevent truncate from stumbling over | |
640 | the shadowed buffer! @@@ This can go if we ever get | |
f5113eff | 641 | rid of the shadow pairing of buffers. */ |
470decc6 DK |
642 | atomic_inc(&jh2bh(jh)->b_count); |
643 | ||
470decc6 | 644 | /* |
f5113eff JK |
645 | * Make a temporary IO buffer with which to write it out |
646 | * (this will requeue the metadata buffer to BJ_Shadow). | |
470decc6 | 647 | */ |
f5113eff | 648 | set_bit(BH_JWrite, &jh2bh(jh)->b_state); |
470decc6 | 649 | JBUFFER_TRACE(jh, "ph3: write metadata"); |
f7f4bccb | 650 | flags = jbd2_journal_write_metadata_buffer(commit_transaction, |
f5113eff | 651 | jh, &wbuf[bufs], blocknr); |
e6ec116b TT |
652 | if (flags < 0) { |
653 | jbd2_journal_abort(journal, flags); | |
654 | continue; | |
655 | } | |
f5113eff | 656 | jbd2_file_log_bh(&io_bufs, wbuf[bufs]); |
470decc6 DK |
657 | |
658 | /* Record the new block's tag in the current descriptor | |
659 | buffer */ | |
660 | ||
661 | tag_flag = 0; | |
662 | if (flags & 1) | |
f7f4bccb | 663 | tag_flag |= JBD2_FLAG_ESCAPE; |
470decc6 | 664 | if (!first_tag) |
f7f4bccb | 665 | tag_flag |= JBD2_FLAG_SAME_UUID; |
470decc6 DK |
666 | |
667 | tag = (journal_block_tag_t *) tagp; | |
db9ee220 | 668 | write_tag_block(journal, tag, jh2bh(jh)->b_blocknr); |
8f888ef8 | 669 | tag->t_flags = cpu_to_be16(tag_flag); |
f5113eff | 670 | jbd2_block_tag_csum_set(journal, tag, wbuf[bufs], |
c3900875 | 671 | commit_transaction->t_tid); |
b517bea1 ZB |
672 | tagp += tag_bytes; |
673 | space_left -= tag_bytes; | |
f5113eff | 674 | bufs++; |
470decc6 DK |
675 | |
676 | if (first_tag) { | |
677 | memcpy (tagp, journal->j_uuid, 16); | |
678 | tagp += 16; | |
679 | space_left -= 16; | |
680 | first_tag = 0; | |
681 | } | |
682 | ||
683 | /* If there's no more to do, or if the descriptor is full, | |
684 | let the IO rip! */ | |
685 | ||
686 | if (bufs == journal->j_wbufsize || | |
687 | commit_transaction->t_buffers == NULL || | |
3caa487f | 688 | space_left < tag_bytes + 16 + csum_size) { |
470decc6 | 689 | |
f2a44523 | 690 | jbd_debug(4, "JBD2: Submit %d IOs\n", bufs); |
470decc6 DK |
691 | |
692 | /* Write an end-of-descriptor marker before | |
693 | submitting the IOs. "tag" still points to | |
694 | the last tag we set up. */ | |
695 | ||
8f888ef8 | 696 | tag->t_flags |= cpu_to_be16(JBD2_FLAG_LAST_TAG); |
470decc6 | 697 | start_journal_io: |
6e876c3d | 698 | if (descriptor) |
699 | jbd2_descriptor_block_csum_set(journal, | |
700 | descriptor); | |
701 | ||
470decc6 DK |
702 | for (i = 0; i < bufs; i++) { |
703 | struct buffer_head *bh = wbuf[i]; | |
818d276c GS |
704 | /* |
705 | * Compute checksum. | |
706 | */ | |
56316a0d | 707 | if (jbd2_has_feature_checksum(journal)) { |
818d276c GS |
708 | crc32_sum = |
709 | jbd2_checksum_data(crc32_sum, bh); | |
710 | } | |
711 | ||
470decc6 DK |
712 | lock_buffer(bh); |
713 | clear_buffer_dirty(bh); | |
714 | set_buffer_uptodate(bh); | |
715 | bh->b_end_io = journal_end_buffer_io_sync; | |
70fd7614 | 716 | submit_bh(REQ_OP_WRITE, REQ_SYNC, bh); |
470decc6 DK |
717 | } |
718 | cond_resched(); | |
bf699327 | 719 | stats.run.rs_blocks_logged += bufs; |
470decc6 DK |
720 | |
721 | /* Force a new descriptor to be generated next | |
722 | time round the loop. */ | |
723 | descriptor = NULL; | |
724 | bufs = 0; | |
725 | } | |
726 | } | |
727 | ||
f73bee49 JK |
728 | err = journal_finish_inode_data_buffers(journal, commit_transaction); |
729 | if (err) { | |
730 | printk(KERN_WARNING | |
731 | "JBD2: Detected IO errors while flushing file data " | |
732 | "on %s\n", journal->j_devname); | |
733 | if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR) | |
734 | jbd2_journal_abort(journal, err); | |
735 | err = 0; | |
736 | } | |
737 | ||
3339578f JK |
738 | /* |
739 | * Get current oldest transaction in the log before we issue flush | |
740 | * to the filesystem device. After the flush we can be sure that | |
741 | * blocks of all older transactions are checkpointed to persistent | |
742 | * storage and we will be safe to update journal start in the | |
743 | * superblock with the numbers we get here. | |
744 | */ | |
745 | update_tail = | |
746 | jbd2_journal_get_log_tail(journal, &first_tid, &first_block); | |
747 | ||
bbd2be36 | 748 | write_lock(&journal->j_state_lock); |
3339578f JK |
749 | if (update_tail) { |
750 | long freed = first_block - journal->j_tail; | |
751 | ||
752 | if (first_block < journal->j_tail) | |
753 | freed += journal->j_last - journal->j_first; | |
754 | /* Update tail only if we free significant amount of space */ | |
755 | if (freed < journal->j_maxlen / 4) | |
756 | update_tail = 0; | |
757 | } | |
bbd2be36 JK |
758 | J_ASSERT(commit_transaction->t_state == T_COMMIT); |
759 | commit_transaction->t_state = T_COMMIT_DFLUSH; | |
760 | write_unlock(&journal->j_state_lock); | |
3339578f | 761 | |
cc3e1bea TT |
762 | /* |
763 | * If the journal is not located on the file system device, | |
764 | * then we must flush the file system device before we issue | |
765 | * the commit record | |
766 | */ | |
81be12c8 | 767 | if (commit_transaction->t_need_data_flush && |
cc3e1bea TT |
768 | (journal->j_fs_dev != journal->j_dev) && |
769 | (journal->j_flags & JBD2_BARRIER)) | |
99aa7846 | 770 | blkdev_issue_flush(journal->j_fs_dev, GFP_NOFS, NULL); |
818d276c | 771 | |
cc3e1bea | 772 | /* Done it all: now write the commit record asynchronously. */ |
56316a0d | 773 | if (jbd2_has_feature_async_commit(journal)) { |
818d276c GS |
774 | err = journal_submit_commit_record(journal, commit_transaction, |
775 | &cbh, crc32_sum); | |
776 | if (err) | |
777 | __jbd2_journal_abort_hard(journal); | |
e9e34f4e | 778 | } |
c851ed54 | 779 | |
82f04ab4 JA |
780 | blk_finish_plug(&plug); |
781 | ||
470decc6 DK |
782 | /* Lo and behold: we have just managed to send a transaction to |
783 | the log. Before we can commit it, wait for the IO so far to | |
784 | complete. Control buffers being written are on the | |
785 | transaction's t_log_list queue, and metadata buffers are on | |
f5113eff | 786 | the io_bufs list. |
470decc6 DK |
787 | |
788 | Wait for the buffers in reverse order. That way we are | |
789 | less likely to be woken up until all IOs have completed, and | |
790 | so we incur less scheduling load. | |
791 | */ | |
792 | ||
f2a44523 | 793 | jbd_debug(3, "JBD2: commit phase 3\n"); |
470decc6 | 794 | |
f5113eff JK |
795 | while (!list_empty(&io_bufs)) { |
796 | struct buffer_head *bh = list_entry(io_bufs.prev, | |
797 | struct buffer_head, | |
798 | b_assoc_buffers); | |
470decc6 | 799 | |
f5113eff JK |
800 | wait_on_buffer(bh); |
801 | cond_resched(); | |
470decc6 DK |
802 | |
803 | if (unlikely(!buffer_uptodate(bh))) | |
804 | err = -EIO; | |
f5113eff | 805 | jbd2_unfile_log_bh(bh); |
470decc6 DK |
806 | |
807 | /* | |
f5113eff JK |
808 | * The list contains temporary buffer heads created by |
809 | * jbd2_journal_write_metadata_buffer(). | |
470decc6 DK |
810 | */ |
811 | BUFFER_TRACE(bh, "dumping temporary bh"); | |
470decc6 DK |
812 | __brelse(bh); |
813 | J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0); | |
814 | free_buffer_head(bh); | |
815 | ||
f5113eff | 816 | /* We also have to refile the corresponding shadowed buffer */ |
470decc6 DK |
817 | jh = commit_transaction->t_shadow_list->b_tprev; |
818 | bh = jh2bh(jh); | |
f5113eff | 819 | clear_buffer_jwrite(bh); |
470decc6 | 820 | J_ASSERT_BH(bh, buffer_jbddirty(bh)); |
b34090e5 | 821 | J_ASSERT_BH(bh, !buffer_shadow(bh)); |
470decc6 DK |
822 | |
823 | /* The metadata is now released for reuse, but we need | |
824 | to remember it against this transaction so that when | |
825 | we finally commit, we can do any checkpointing | |
826 | required. */ | |
827 | JBUFFER_TRACE(jh, "file as BJ_Forget"); | |
f7f4bccb | 828 | jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget); |
470decc6 DK |
829 | JBUFFER_TRACE(jh, "brelse shadowed buffer"); |
830 | __brelse(bh); | |
831 | } | |
832 | ||
833 | J_ASSERT (commit_transaction->t_shadow_list == NULL); | |
834 | ||
f2a44523 | 835 | jbd_debug(3, "JBD2: commit phase 4\n"); |
470decc6 DK |
836 | |
837 | /* Here we wait for the revoke record and descriptor record buffers */ | |
e5a120ae | 838 | while (!list_empty(&log_bufs)) { |
470decc6 DK |
839 | struct buffer_head *bh; |
840 | ||
e5a120ae JK |
841 | bh = list_entry(log_bufs.prev, struct buffer_head, b_assoc_buffers); |
842 | wait_on_buffer(bh); | |
843 | cond_resched(); | |
470decc6 DK |
844 | |
845 | if (unlikely(!buffer_uptodate(bh))) | |
846 | err = -EIO; | |
847 | ||
848 | BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile"); | |
849 | clear_buffer_jwrite(bh); | |
e5a120ae | 850 | jbd2_unfile_log_bh(bh); |
470decc6 DK |
851 | __brelse(bh); /* One for getblk */ |
852 | /* AKPM: bforget here */ | |
853 | } | |
854 | ||
77e841de HK |
855 | if (err) |
856 | jbd2_journal_abort(journal, err); | |
857 | ||
f2a44523 | 858 | jbd_debug(3, "JBD2: commit phase 5\n"); |
bbd2be36 JK |
859 | write_lock(&journal->j_state_lock); |
860 | J_ASSERT(commit_transaction->t_state == T_COMMIT_DFLUSH); | |
861 | commit_transaction->t_state = T_COMMIT_JFLUSH; | |
862 | write_unlock(&journal->j_state_lock); | |
470decc6 | 863 | |
56316a0d | 864 | if (!jbd2_has_feature_async_commit(journal)) { |
818d276c GS |
865 | err = journal_submit_commit_record(journal, commit_transaction, |
866 | &cbh, crc32_sum); | |
867 | if (err) | |
868 | __jbd2_journal_abort_hard(journal); | |
869 | } | |
6cba611e | 870 | if (cbh) |
fd98496f | 871 | err = journal_wait_on_commit_record(journal, cbh); |
56316a0d | 872 | if (jbd2_has_feature_async_commit(journal) && |
f73bee49 | 873 | journal->j_flags & JBD2_BARRIER) { |
99aa7846 | 874 | blkdev_issue_flush(journal->j_dev, GFP_NOFS, NULL); |
f73bee49 | 875 | } |
470decc6 DK |
876 | |
877 | if (err) | |
a7fa2baf | 878 | jbd2_journal_abort(journal, err); |
470decc6 | 879 | |
3339578f JK |
880 | /* |
881 | * Now disk caches for filesystem device are flushed so we are safe to | |
882 | * erase checkpointed transactions from the log by updating journal | |
883 | * superblock. | |
884 | */ | |
885 | if (update_tail) | |
886 | jbd2_update_log_tail(journal, first_tid, first_block); | |
887 | ||
470decc6 DK |
888 | /* End of a transaction! Finally, we can do checkpoint |
889 | processing: any buffers committed as a result of this | |
890 | transaction can be removed from any checkpoint list it was on | |
891 | before. */ | |
892 | ||
f2a44523 | 893 | jbd_debug(3, "JBD2: commit phase 6\n"); |
470decc6 | 894 | |
c851ed54 | 895 | J_ASSERT(list_empty(&commit_transaction->t_inode_list)); |
470decc6 DK |
896 | J_ASSERT(commit_transaction->t_buffers == NULL); |
897 | J_ASSERT(commit_transaction->t_checkpoint_list == NULL); | |
470decc6 | 898 | J_ASSERT(commit_transaction->t_shadow_list == NULL); |
470decc6 DK |
899 | |
900 | restart_loop: | |
901 | /* | |
902 | * As there are other places (journal_unmap_buffer()) adding buffers | |
903 | * to this list we have to be careful and hold the j_list_lock. | |
904 | */ | |
905 | spin_lock(&journal->j_list_lock); | |
906 | while (commit_transaction->t_forget) { | |
907 | transaction_t *cp_transaction; | |
908 | struct buffer_head *bh; | |
de1b7941 | 909 | int try_to_free = 0; |
470decc6 DK |
910 | |
911 | jh = commit_transaction->t_forget; | |
912 | spin_unlock(&journal->j_list_lock); | |
913 | bh = jh2bh(jh); | |
de1b7941 JK |
914 | /* |
915 | * Get a reference so that bh cannot be freed before we are | |
916 | * done with it. | |
917 | */ | |
918 | get_bh(bh); | |
470decc6 | 919 | jbd_lock_bh_state(bh); |
23e2af35 | 920 | J_ASSERT_JH(jh, jh->b_transaction == commit_transaction); |
470decc6 DK |
921 | |
922 | /* | |
923 | * If there is undo-protected committed data against | |
924 | * this buffer, then we can remove it now. If it is a | |
925 | * buffer needing such protection, the old frozen_data | |
926 | * field now points to a committed version of the | |
927 | * buffer, so rotate that field to the new committed | |
928 | * data. | |
929 | * | |
930 | * Otherwise, we can just throw away the frozen data now. | |
e06c8227 JB |
931 | * |
932 | * We also know that the frozen data has already fired | |
933 | * its triggers if they exist, so we can clear that too. | |
470decc6 DK |
934 | */ |
935 | if (jh->b_committed_data) { | |
af1e76d6 | 936 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
937 | jh->b_committed_data = NULL; |
938 | if (jh->b_frozen_data) { | |
939 | jh->b_committed_data = jh->b_frozen_data; | |
940 | jh->b_frozen_data = NULL; | |
e06c8227 | 941 | jh->b_frozen_triggers = NULL; |
470decc6 DK |
942 | } |
943 | } else if (jh->b_frozen_data) { | |
af1e76d6 | 944 | jbd2_free(jh->b_frozen_data, bh->b_size); |
470decc6 | 945 | jh->b_frozen_data = NULL; |
e06c8227 | 946 | jh->b_frozen_triggers = NULL; |
470decc6 DK |
947 | } |
948 | ||
949 | spin_lock(&journal->j_list_lock); | |
950 | cp_transaction = jh->b_cp_transaction; | |
951 | if (cp_transaction) { | |
952 | JBUFFER_TRACE(jh, "remove from old cp transaction"); | |
8e85fb3f | 953 | cp_transaction->t_chp_stats.cs_dropped++; |
f7f4bccb | 954 | __jbd2_journal_remove_checkpoint(jh); |
470decc6 DK |
955 | } |
956 | ||
957 | /* Only re-checkpoint the buffer_head if it is marked | |
958 | * dirty. If the buffer was added to the BJ_Forget list | |
f7f4bccb | 959 | * by jbd2_journal_forget, it may no longer be dirty and |
470decc6 DK |
960 | * there's no point in keeping a checkpoint record for |
961 | * it. */ | |
962 | ||
b794e7a6 JK |
963 | /* |
964 | * A buffer which has been freed while still being journaled by | |
965 | * a previous transaction. | |
966 | */ | |
967 | if (buffer_freed(bh)) { | |
968 | /* | |
969 | * If the running transaction is the one containing | |
970 | * "add to orphan" operation (b_next_transaction != | |
971 | * NULL), we have to wait for that transaction to | |
972 | * commit before we can really get rid of the buffer. | |
973 | * So just clear b_modified to not confuse transaction | |
974 | * credit accounting and refile the buffer to | |
975 | * BJ_Forget of the running transaction. If the just | |
976 | * committed transaction contains "add to orphan" | |
977 | * operation, we can completely invalidate the buffer | |
978 | * now. We are rather through in that since the | |
979 | * buffer may be still accessible when blocksize < | |
980 | * pagesize and it is attached to the last partial | |
981 | * page. | |
982 | */ | |
983 | jh->b_modified = 0; | |
984 | if (!jh->b_next_transaction) { | |
985 | clear_buffer_freed(bh); | |
986 | clear_buffer_jbddirty(bh); | |
987 | clear_buffer_mapped(bh); | |
988 | clear_buffer_new(bh); | |
989 | clear_buffer_req(bh); | |
990 | bh->b_bdev = NULL; | |
991 | } | |
470decc6 DK |
992 | } |
993 | ||
994 | if (buffer_jbddirty(bh)) { | |
995 | JBUFFER_TRACE(jh, "add to new checkpointing trans"); | |
f7f4bccb | 996 | __jbd2_journal_insert_checkpoint(jh, commit_transaction); |
7ad7445f HK |
997 | if (is_journal_aborted(journal)) |
998 | clear_buffer_jbddirty(bh); | |
470decc6 DK |
999 | } else { |
1000 | J_ASSERT_BH(bh, !buffer_dirty(bh)); | |
de1b7941 JK |
1001 | /* |
1002 | * The buffer on BJ_Forget list and not jbddirty means | |
470decc6 DK |
1003 | * it has been freed by this transaction and hence it |
1004 | * could not have been reallocated until this | |
1005 | * transaction has committed. *BUT* it could be | |
1006 | * reallocated once we have written all the data to | |
1007 | * disk and before we process the buffer on BJ_Forget | |
de1b7941 JK |
1008 | * list. |
1009 | */ | |
1010 | if (!jh->b_next_transaction) | |
1011 | try_to_free = 1; | |
470decc6 | 1012 | } |
de1b7941 JK |
1013 | JBUFFER_TRACE(jh, "refile or unfile buffer"); |
1014 | __jbd2_journal_refile_buffer(jh); | |
1015 | jbd_unlock_bh_state(bh); | |
1016 | if (try_to_free) | |
1017 | release_buffer_page(bh); /* Drops bh reference */ | |
1018 | else | |
1019 | __brelse(bh); | |
470decc6 DK |
1020 | cond_resched_lock(&journal->j_list_lock); |
1021 | } | |
1022 | spin_unlock(&journal->j_list_lock); | |
1023 | /* | |
f5a7a6b0 JK |
1024 | * This is a bit sleazy. We use j_list_lock to protect transition |
1025 | * of a transaction into T_FINISHED state and calling | |
1026 | * __jbd2_journal_drop_transaction(). Otherwise we could race with | |
1027 | * other checkpointing code processing the transaction... | |
470decc6 | 1028 | */ |
a931da6a | 1029 | write_lock(&journal->j_state_lock); |
470decc6 DK |
1030 | spin_lock(&journal->j_list_lock); |
1031 | /* | |
1032 | * Now recheck if some buffers did not get attached to the transaction | |
1033 | * while the lock was dropped... | |
1034 | */ | |
1035 | if (commit_transaction->t_forget) { | |
1036 | spin_unlock(&journal->j_list_lock); | |
a931da6a | 1037 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
1038 | goto restart_loop; |
1039 | } | |
1040 | ||
d4e839d4 TT |
1041 | /* Add the transaction to the checkpoint list |
1042 | * __journal_remove_checkpoint() can not destroy transaction | |
1043 | * under us because it is not marked as T_FINISHED yet */ | |
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 | spin_unlock(&journal->j_list_lock); | |
1059 | ||
470decc6 DK |
1060 | /* Done with this transaction! */ |
1061 | ||
f2a44523 | 1062 | jbd_debug(3, "JBD2: commit phase 7\n"); |
470decc6 | 1063 | |
bbd2be36 | 1064 | J_ASSERT(commit_transaction->t_state == T_COMMIT_JFLUSH); |
470decc6 | 1065 | |
8e85fb3f | 1066 | commit_transaction->t_start = jiffies; |
bf699327 TT |
1067 | stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging, |
1068 | commit_transaction->t_start); | |
8e85fb3f JL |
1069 | |
1070 | /* | |
bf699327 | 1071 | * File the transaction statistics |
8e85fb3f | 1072 | */ |
8e85fb3f | 1073 | stats.ts_tid = commit_transaction->t_tid; |
8dd42046 TT |
1074 | stats.run.rs_handle_count = |
1075 | atomic_read(&commit_transaction->t_handle_count); | |
bf699327 TT |
1076 | trace_jbd2_run_stats(journal->j_fs_dev->bd_dev, |
1077 | commit_transaction->t_tid, &stats.run); | |
42cf3452 | 1078 | stats.ts_requested = (commit_transaction->t_requested) ? 1 : 0; |
8e85fb3f | 1079 | |
794446c6 | 1080 | commit_transaction->t_state = T_COMMIT_CALLBACK; |
470decc6 DK |
1081 | J_ASSERT(commit_transaction == journal->j_committing_transaction); |
1082 | journal->j_commit_sequence = commit_transaction->t_tid; | |
1083 | journal->j_committing_transaction = NULL; | |
e07f7183 | 1084 | commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time)); |
470decc6 | 1085 | |
e07f7183 JB |
1086 | /* |
1087 | * weight the commit time higher than the average time so we don't | |
1088 | * react too strongly to vast changes in the commit time | |
1089 | */ | |
1090 | if (likely(journal->j_average_commit_time)) | |
1091 | journal->j_average_commit_time = (commit_time + | |
1092 | journal->j_average_commit_time*3) / 4; | |
1093 | else | |
1094 | journal->j_average_commit_time = commit_time; | |
794446c6 | 1095 | |
a931da6a | 1096 | write_unlock(&journal->j_state_lock); |
6c20ec85 | 1097 | |
fb68407b AK |
1098 | if (journal->j_commit_callback) |
1099 | journal->j_commit_callback(journal, commit_transaction); | |
1100 | ||
879c5e6b | 1101 | trace_jbd2_end_commit(journal, commit_transaction); |
f2a44523 | 1102 | jbd_debug(1, "JBD2: commit %d complete, head %d\n", |
470decc6 DK |
1103 | journal->j_commit_sequence, journal->j_tail_sequence); |
1104 | ||
794446c6 DM |
1105 | write_lock(&journal->j_state_lock); |
1106 | spin_lock(&journal->j_list_lock); | |
1107 | commit_transaction->t_state = T_FINISHED; | |
d4e839d4 | 1108 | /* Check if the transaction can be dropped now that we are finished */ |
794446c6 DM |
1109 | if (commit_transaction->t_checkpoint_list == NULL && |
1110 | commit_transaction->t_checkpoint_io_list == NULL) { | |
1111 | __jbd2_journal_drop_transaction(journal, commit_transaction); | |
1112 | jbd2_journal_free_transaction(commit_transaction); | |
1113 | } | |
1114 | spin_unlock(&journal->j_list_lock); | |
1115 | write_unlock(&journal->j_state_lock); | |
470decc6 | 1116 | wake_up(&journal->j_wait_done_commit); |
42cf3452 TT |
1117 | |
1118 | /* | |
1119 | * Calculate overall stats | |
1120 | */ | |
1121 | spin_lock(&journal->j_history_lock); | |
1122 | journal->j_stats.ts_tid++; | |
1123 | journal->j_stats.ts_requested += stats.ts_requested; | |
1124 | journal->j_stats.run.rs_wait += stats.run.rs_wait; | |
1125 | journal->j_stats.run.rs_request_delay += stats.run.rs_request_delay; | |
1126 | journal->j_stats.run.rs_running += stats.run.rs_running; | |
1127 | journal->j_stats.run.rs_locked += stats.run.rs_locked; | |
1128 | journal->j_stats.run.rs_flushing += stats.run.rs_flushing; | |
1129 | journal->j_stats.run.rs_logging += stats.run.rs_logging; | |
1130 | journal->j_stats.run.rs_handle_count += stats.run.rs_handle_count; | |
1131 | journal->j_stats.run.rs_blocks += stats.run.rs_blocks; | |
1132 | journal->j_stats.run.rs_blocks_logged += stats.run.rs_blocks_logged; | |
1133 | spin_unlock(&journal->j_history_lock); | |
470decc6 | 1134 | } |