Commit | Line | Data |
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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 | |
a4977306 | 187 | * use writepages() because with delayed allocation we may be doing |
cd1aac32 AK |
188 | * block allocation in writepages(). |
189 | */ | |
aa3c0c61 | 190 | int jbd2_journal_submit_inode_data_buffers(struct jbd2_inode *jinode) |
cd1aac32 | 191 | { |
aa3c0c61 | 192 | struct address_space *mapping = jinode->i_vfs_inode->i_mapping; |
cd1aac32 AK |
193 | struct writeback_control wbc = { |
194 | .sync_mode = WB_SYNC_ALL, | |
195 | .nr_to_write = mapping->nrpages * 2, | |
aa3c0c61 MFO |
196 | .range_start = jinode->i_dirty_start, |
197 | .range_end = jinode->i_dirty_end, | |
cd1aac32 AK |
198 | }; |
199 | ||
342af94e MFO |
200 | /* |
201 | * submit the inode data buffers. We use writepage | |
202 | * instead of writepages. Because writepages can do | |
203 | * block allocation with delalloc. We need to write | |
204 | * only allocated blocks here. | |
205 | */ | |
aa3c0c61 | 206 | return generic_writepages(mapping, &wbc); |
cd1aac32 AK |
207 | } |
208 | ||
ff780b91 HS |
209 | /* Send all the data buffers related to an inode */ |
210 | int jbd2_submit_inode_data(struct jbd2_inode *jinode) | |
211 | { | |
212 | ||
213 | if (!jinode || !(jinode->i_flags & JI_WRITE_DATA)) | |
214 | return 0; | |
215 | ||
216 | trace_jbd2_submit_inode_data(jinode->i_vfs_inode); | |
217 | return jbd2_journal_submit_inode_data_buffers(jinode); | |
218 | ||
219 | } | |
220 | EXPORT_SYMBOL(jbd2_submit_inode_data); | |
221 | ||
222 | int jbd2_wait_inode_data(journal_t *journal, struct jbd2_inode *jinode) | |
223 | { | |
224 | if (!jinode || !(jinode->i_flags & JI_WAIT_DATA) || | |
225 | !jinode->i_vfs_inode || !jinode->i_vfs_inode->i_mapping) | |
226 | return 0; | |
227 | return filemap_fdatawait_range_keep_errors( | |
228 | jinode->i_vfs_inode->i_mapping, jinode->i_dirty_start, | |
229 | jinode->i_dirty_end); | |
230 | } | |
231 | EXPORT_SYMBOL(jbd2_wait_inode_data); | |
232 | ||
c851ed54 JK |
233 | /* |
234 | * Submit all the data buffers of inode associated with the transaction to | |
235 | * disk. | |
236 | * | |
237 | * We are in a committing transaction. Therefore no new inode can be added to | |
238 | * our inode list. We use JI_COMMIT_RUNNING flag to protect inode we currently | |
239 | * operate on from being released while we write out pages. | |
240 | */ | |
cd1aac32 | 241 | static int journal_submit_data_buffers(journal_t *journal, |
c851ed54 JK |
242 | transaction_t *commit_transaction) |
243 | { | |
244 | struct jbd2_inode *jinode; | |
245 | int err, ret = 0; | |
c851ed54 JK |
246 | |
247 | spin_lock(&journal->j_list_lock); | |
248 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { | |
41617e1a JK |
249 | if (!(jinode->i_flags & JI_WRITE_DATA)) |
250 | continue; | |
cb0d9d47 | 251 | jinode->i_flags |= JI_COMMIT_RUNNING; |
c851ed54 | 252 | spin_unlock(&journal->j_list_lock); |
342af94e | 253 | /* submit the inode data buffers. */ |
879c5e6b | 254 | trace_jbd2_submit_inode_data(jinode->i_vfs_inode); |
342af94e MFO |
255 | if (journal->j_submit_inode_data_buffers) { |
256 | err = journal->j_submit_inode_data_buffers(jinode); | |
257 | if (!ret) | |
258 | ret = err; | |
259 | } | |
c851ed54 JK |
260 | spin_lock(&journal->j_list_lock); |
261 | J_ASSERT(jinode->i_transaction == commit_transaction); | |
cb0d9d47 JK |
262 | jinode->i_flags &= ~JI_COMMIT_RUNNING; |
263 | smp_mb(); | |
c851ed54 JK |
264 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); |
265 | } | |
266 | spin_unlock(&journal->j_list_lock); | |
267 | return ret; | |
268 | } | |
269 | ||
aa3c0c61 MFO |
270 | int jbd2_journal_finish_inode_data_buffers(struct jbd2_inode *jinode) |
271 | { | |
272 | struct address_space *mapping = jinode->i_vfs_inode->i_mapping; | |
273 | ||
274 | return filemap_fdatawait_range_keep_errors(mapping, | |
275 | jinode->i_dirty_start, | |
276 | jinode->i_dirty_end); | |
277 | } | |
278 | ||
c851ed54 JK |
279 | /* |
280 | * Wait for data submitted for writeout, refile inodes to proper | |
281 | * transaction if needed. | |
282 | * | |
283 | */ | |
284 | static int journal_finish_inode_data_buffers(journal_t *journal, | |
285 | transaction_t *commit_transaction) | |
286 | { | |
287 | struct jbd2_inode *jinode, *next_i; | |
288 | int err, ret = 0; | |
289 | ||
cd1aac32 | 290 | /* For locking, see the comment in journal_submit_data_buffers() */ |
c851ed54 JK |
291 | spin_lock(&journal->j_list_lock); |
292 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { | |
41617e1a JK |
293 | if (!(jinode->i_flags & JI_WAIT_DATA)) |
294 | continue; | |
cb0d9d47 | 295 | jinode->i_flags |= JI_COMMIT_RUNNING; |
c851ed54 | 296 | spin_unlock(&journal->j_list_lock); |
342af94e MFO |
297 | /* wait for the inode data buffers writeout. */ |
298 | if (journal->j_finish_inode_data_buffers) { | |
299 | err = journal->j_finish_inode_data_buffers(jinode); | |
300 | if (!ret) | |
301 | ret = err; | |
302 | } | |
c851ed54 | 303 | spin_lock(&journal->j_list_lock); |
cb0d9d47 JK |
304 | jinode->i_flags &= ~JI_COMMIT_RUNNING; |
305 | smp_mb(); | |
c851ed54 JK |
306 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); |
307 | } | |
308 | ||
309 | /* Now refile inode to proper lists */ | |
310 | list_for_each_entry_safe(jinode, next_i, | |
311 | &commit_transaction->t_inode_list, i_list) { | |
312 | list_del(&jinode->i_list); | |
313 | if (jinode->i_next_transaction) { | |
314 | jinode->i_transaction = jinode->i_next_transaction; | |
315 | jinode->i_next_transaction = NULL; | |
316 | list_add(&jinode->i_list, | |
317 | &jinode->i_transaction->t_inode_list); | |
318 | } else { | |
319 | jinode->i_transaction = NULL; | |
6ba0e7dc RZ |
320 | jinode->i_dirty_start = 0; |
321 | jinode->i_dirty_end = 0; | |
c851ed54 JK |
322 | } |
323 | } | |
324 | spin_unlock(&journal->j_list_lock); | |
325 | ||
326 | return ret; | |
327 | } | |
328 | ||
818d276c GS |
329 | static __u32 jbd2_checksum_data(__u32 crc32_sum, struct buffer_head *bh) |
330 | { | |
331 | struct page *page = bh->b_page; | |
332 | char *addr; | |
333 | __u32 checksum; | |
334 | ||
303a8f2a | 335 | addr = kmap_atomic(page); |
818d276c GS |
336 | checksum = crc32_be(crc32_sum, |
337 | (void *)(addr + offset_in_page(bh->b_data)), bh->b_size); | |
303a8f2a | 338 | kunmap_atomic(addr); |
818d276c GS |
339 | |
340 | return checksum; | |
341 | } | |
342 | ||
db9ee220 | 343 | static void write_tag_block(journal_t *j, journal_block_tag_t *tag, |
18eba7aa | 344 | unsigned long long block) |
b517bea1 ZB |
345 | { |
346 | tag->t_blocknr = cpu_to_be32(block & (u32)~0); | |
56316a0d | 347 | if (jbd2_has_feature_64bit(j)) |
b517bea1 ZB |
348 | tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1); |
349 | } | |
350 | ||
c3900875 DW |
351 | static void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag, |
352 | struct buffer_head *bh, __u32 sequence) | |
353 | { | |
db9ee220 | 354 | journal_block_tag3_t *tag3 = (journal_block_tag3_t *)tag; |
c3900875 DW |
355 | struct page *page = bh->b_page; |
356 | __u8 *addr; | |
eee06c56 | 357 | __u32 csum32; |
18a6ea1e | 358 | __be32 seq; |
c3900875 | 359 | |
db9ee220 | 360 | if (!jbd2_journal_has_csum_v2or3(j)) |
c3900875 DW |
361 | return; |
362 | ||
18a6ea1e | 363 | seq = cpu_to_be32(sequence); |
906adea1 | 364 | addr = kmap_atomic(page); |
18a6ea1e | 365 | csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&seq, sizeof(seq)); |
eee06c56 DW |
366 | csum32 = jbd2_chksum(j, csum32, addr + offset_in_page(bh->b_data), |
367 | bh->b_size); | |
906adea1 | 368 | kunmap_atomic(addr); |
c3900875 | 369 | |
56316a0d | 370 | if (jbd2_has_feature_csum3(j)) |
db9ee220 DW |
371 | tag3->t_checksum = cpu_to_be32(csum32); |
372 | else | |
373 | tag->t_checksum = cpu_to_be16(csum32); | |
c3900875 | 374 | } |
470decc6 | 375 | /* |
f7f4bccb | 376 | * jbd2_journal_commit_transaction |
470decc6 DK |
377 | * |
378 | * The primary function for committing a transaction to the log. This | |
379 | * function is called by the journal thread to begin a complete commit. | |
380 | */ | |
f7f4bccb | 381 | void jbd2_journal_commit_transaction(journal_t *journal) |
470decc6 | 382 | { |
8e85fb3f | 383 | struct transaction_stats_s stats; |
470decc6 | 384 | transaction_t *commit_transaction; |
e5a120ae JK |
385 | struct journal_head *jh; |
386 | struct buffer_head *descriptor; | |
470decc6 DK |
387 | struct buffer_head **wbuf = journal->j_wbuf; |
388 | int bufs; | |
389 | int flags; | |
390 | int err; | |
18eba7aa | 391 | unsigned long long blocknr; |
e07f7183 JB |
392 | ktime_t start_time; |
393 | u64 commit_time; | |
470decc6 | 394 | char *tagp = NULL; |
470decc6 DK |
395 | journal_block_tag_t *tag = NULL; |
396 | int space_left = 0; | |
397 | int first_tag = 0; | |
398 | int tag_flag; | |
794446c6 | 399 | int i; |
b517bea1 | 400 | int tag_bytes = journal_tag_bytes(journal); |
818d276c GS |
401 | struct buffer_head *cbh = NULL; /* For transactional checksums */ |
402 | __u32 crc32_sum = ~0; | |
82f04ab4 | 403 | struct blk_plug plug; |
3339578f JK |
404 | /* Tail of the journal */ |
405 | unsigned long first_block; | |
406 | tid_t first_tid; | |
407 | int update_tail; | |
3caa487f | 408 | int csum_size = 0; |
f5113eff | 409 | LIST_HEAD(io_bufs); |
e5a120ae | 410 | LIST_HEAD(log_bufs); |
3caa487f | 411 | |
db9ee220 | 412 | if (jbd2_journal_has_csum_v2or3(journal)) |
3caa487f | 413 | csum_size = sizeof(struct jbd2_journal_block_tail); |
470decc6 DK |
414 | |
415 | /* | |
416 | * First job: lock down the current transaction and wait for | |
417 | * all outstanding updates to complete. | |
418 | */ | |
419 | ||
f7f4bccb MC |
420 | /* Do we need to erase the effects of a prior jbd2_journal_flush? */ |
421 | if (journal->j_flags & JBD2_FLUSHED) { | |
470decc6 | 422 | jbd_debug(3, "super block updated\n"); |
6fa7aa50 | 423 | mutex_lock_io(&journal->j_checkpoint_mutex); |
79feb521 JK |
424 | /* |
425 | * We hold j_checkpoint_mutex so tail cannot change under us. | |
426 | * We don't need any special data guarantees for writing sb | |
427 | * since journal is empty and it is ok for write to be | |
428 | * flushed only with transaction commit. | |
429 | */ | |
430 | jbd2_journal_update_sb_log_tail(journal, | |
431 | journal->j_tail_sequence, | |
432 | journal->j_tail, | |
70fd7614 | 433 | REQ_SYNC); |
a78bb11d | 434 | mutex_unlock(&journal->j_checkpoint_mutex); |
470decc6 DK |
435 | } else { |
436 | jbd_debug(3, "superblock not updated\n"); | |
437 | } | |
438 | ||
439 | J_ASSERT(journal->j_running_transaction != NULL); | |
440 | J_ASSERT(journal->j_committing_transaction == NULL); | |
441 | ||
ff780b91 HS |
442 | write_lock(&journal->j_state_lock); |
443 | journal->j_flags |= JBD2_FULL_COMMIT_ONGOING; | |
444 | while (journal->j_flags & JBD2_FAST_COMMIT_ONGOING) { | |
445 | DEFINE_WAIT(wait); | |
446 | ||
447 | prepare_to_wait(&journal->j_fc_wait, &wait, | |
448 | TASK_UNINTERRUPTIBLE); | |
449 | write_unlock(&journal->j_state_lock); | |
450 | schedule(); | |
451 | write_lock(&journal->j_state_lock); | |
452 | finish_wait(&journal->j_fc_wait, &wait); | |
cc80586a HS |
453 | /* |
454 | * TODO: by blocking fast commits here, we are increasing | |
455 | * fsync() latency slightly. Strictly speaking, we don't need | |
456 | * to block fast commits until the transaction enters T_FLUSH | |
457 | * state. So an optimization is possible where we block new fast | |
458 | * commits here and wait for existing ones to complete | |
459 | * just before we enter T_FLUSH. That way, the existing fast | |
460 | * commits and this full commit can proceed parallely. | |
461 | */ | |
ff780b91 HS |
462 | } |
463 | write_unlock(&journal->j_state_lock); | |
464 | ||
470decc6 | 465 | commit_transaction = journal->j_running_transaction; |
470decc6 | 466 | |
879c5e6b | 467 | trace_jbd2_start_commit(journal, commit_transaction); |
f2a44523 | 468 | jbd_debug(1, "JBD2: starting commit of transaction %d\n", |
470decc6 DK |
469 | commit_transaction->t_tid); |
470 | ||
a931da6a | 471 | write_lock(&journal->j_state_lock); |
ff780b91 | 472 | journal->j_fc_off = 0; |
3ca841c1 | 473 | J_ASSERT(commit_transaction->t_state == T_RUNNING); |
470decc6 DK |
474 | commit_transaction->t_state = T_LOCKED; |
475 | ||
879c5e6b | 476 | trace_jbd2_commit_locking(journal, commit_transaction); |
bf699327 | 477 | stats.run.rs_wait = commit_transaction->t_max_wait; |
9fff24aa | 478 | stats.run.rs_request_delay = 0; |
bf699327 | 479 | stats.run.rs_locked = jiffies; |
9fff24aa TT |
480 | if (commit_transaction->t_requested) |
481 | stats.run.rs_request_delay = | |
482 | jbd2_time_diff(commit_transaction->t_requested, | |
483 | stats.run.rs_locked); | |
bf699327 TT |
484 | stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start, |
485 | stats.run.rs_locked); | |
8e85fb3f | 486 | |
4f981868 RH |
487 | // waits for any t_updates to finish |
488 | jbd2_journal_wait_updates(journal); | |
470decc6 | 489 | |
96f1e097 JK |
490 | commit_transaction->t_state = T_SWITCH; |
491 | write_unlock(&journal->j_state_lock); | |
470decc6 | 492 | |
a51dca9c | 493 | J_ASSERT (atomic_read(&commit_transaction->t_outstanding_credits) <= |
470decc6 DK |
494 | journal->j_max_transaction_buffers); |
495 | ||
496 | /* | |
497 | * First thing we are allowed to do is to discard any remaining | |
498 | * BJ_Reserved buffers. Note, it is _not_ permissible to assume | |
499 | * that there are no such buffers: if a large filesystem | |
500 | * operation like a truncate needs to split itself over multiple | |
f7f4bccb | 501 | * transactions, then it may try to do a jbd2_journal_restart() while |
470decc6 DK |
502 | * there are still BJ_Reserved buffers outstanding. These must |
503 | * be released cleanly from the current transaction. | |
504 | * | |
505 | * In this case, the filesystem must still reserve write access | |
506 | * again before modifying the buffer in the new transaction, but | |
507 | * we do not require it to remember exactly which old buffers it | |
508 | * has reserved. This is consistent with the existing behaviour | |
f7f4bccb | 509 | * that multiple jbd2_journal_get_write_access() calls to the same |
25985edc | 510 | * buffer are perfectly permissible. |
470decc6 DK |
511 | */ |
512 | while (commit_transaction->t_reserved_list) { | |
513 | jh = commit_transaction->t_reserved_list; | |
514 | JBUFFER_TRACE(jh, "reserved, unused: refile"); | |
515 | /* | |
f7f4bccb | 516 | * A jbd2_journal_get_undo_access()+jbd2_journal_release_buffer() may |
470decc6 DK |
517 | * leave undo-committed data. |
518 | */ | |
519 | if (jh->b_committed_data) { | |
520 | struct buffer_head *bh = jh2bh(jh); | |
521 | ||
46417064 | 522 | spin_lock(&jh->b_state_lock); |
af1e76d6 | 523 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 | 524 | jh->b_committed_data = NULL; |
46417064 | 525 | spin_unlock(&jh->b_state_lock); |
470decc6 | 526 | } |
f7f4bccb | 527 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
528 | } |
529 | ||
530 | /* | |
531 | * Now try to drop any written-back buffers from the journal's | |
532 | * checkpoint lists. We do this *before* commit because it potentially | |
533 | * frees some memory | |
534 | */ | |
535 | spin_lock(&journal->j_list_lock); | |
841df7df | 536 | __jbd2_journal_clean_checkpoint_list(journal, false); |
470decc6 DK |
537 | spin_unlock(&journal->j_list_lock); |
538 | ||
f2a44523 | 539 | jbd_debug(3, "JBD2: commit phase 1\n"); |
470decc6 | 540 | |
1ba37268 YY |
541 | /* |
542 | * Clear revoked flag to reflect there is no revoked buffers | |
543 | * in the next transaction which is going to be started. | |
544 | */ | |
545 | jbd2_clear_buffer_revoked_flags(journal); | |
546 | ||
470decc6 DK |
547 | /* |
548 | * Switch to a new revoke table. | |
549 | */ | |
f7f4bccb | 550 | jbd2_journal_switch_revoke_table(journal); |
470decc6 | 551 | |
8f7d89f3 JK |
552 | /* |
553 | * Reserved credits cannot be claimed anymore, free them | |
554 | */ | |
555 | atomic_sub(atomic_read(&journal->j_reserved_credits), | |
556 | &commit_transaction->t_outstanding_credits); | |
557 | ||
96f1e097 | 558 | write_lock(&journal->j_state_lock); |
879c5e6b | 559 | trace_jbd2_commit_flushing(journal, commit_transaction); |
bf699327 TT |
560 | stats.run.rs_flushing = jiffies; |
561 | stats.run.rs_locked = jbd2_time_diff(stats.run.rs_locked, | |
562 | stats.run.rs_flushing); | |
8e85fb3f | 563 | |
470decc6 DK |
564 | commit_transaction->t_state = T_FLUSH; |
565 | journal->j_committing_transaction = commit_transaction; | |
566 | journal->j_running_transaction = NULL; | |
e07f7183 | 567 | start_time = ktime_get(); |
470decc6 DK |
568 | commit_transaction->t_log_start = journal->j_head; |
569 | wake_up(&journal->j_wait_transaction_locked); | |
a931da6a | 570 | write_unlock(&journal->j_state_lock); |
470decc6 | 571 | |
cfc7bc89 | 572 | jbd_debug(3, "JBD2: commit phase 2a\n"); |
470decc6 | 573 | |
470decc6 DK |
574 | /* |
575 | * Now start flushing things to disk, in the order they appear | |
576 | * on the transaction lists. Data blocks go first. | |
577 | */ | |
cd1aac32 | 578 | err = journal_submit_data_buffers(journal, commit_transaction); |
470decc6 | 579 | if (err) |
a7fa2baf | 580 | jbd2_journal_abort(journal, err); |
470decc6 | 581 | |
82f04ab4 | 582 | blk_start_plug(&plug); |
9bcf976c | 583 | jbd2_journal_write_revoke_records(commit_transaction, &log_bufs); |
470decc6 | 584 | |
cfc7bc89 | 585 | jbd_debug(3, "JBD2: commit phase 2b\n"); |
470decc6 | 586 | |
470decc6 DK |
587 | /* |
588 | * Way to go: we have now written out all of the data for a | |
589 | * transaction! Now comes the tricky part: we need to write out | |
590 | * metadata. Loop over the transaction's entire buffer list: | |
591 | */ | |
a931da6a | 592 | write_lock(&journal->j_state_lock); |
470decc6 | 593 | commit_transaction->t_state = T_COMMIT; |
a931da6a | 594 | write_unlock(&journal->j_state_lock); |
470decc6 | 595 | |
879c5e6b | 596 | trace_jbd2_commit_logging(journal, commit_transaction); |
bf699327 TT |
597 | stats.run.rs_logging = jiffies; |
598 | stats.run.rs_flushing = jbd2_time_diff(stats.run.rs_flushing, | |
599 | stats.run.rs_logging); | |
9f356e5a | 600 | stats.run.rs_blocks = commit_transaction->t_nr_buffers; |
bf699327 | 601 | stats.run.rs_blocks_logged = 0; |
8e85fb3f | 602 | |
1dfc3220 | 603 | J_ASSERT(commit_transaction->t_nr_buffers <= |
a51dca9c | 604 | atomic_read(&commit_transaction->t_outstanding_credits)); |
1dfc3220 | 605 | |
87c89c23 | 606 | err = 0; |
470decc6 | 607 | bufs = 0; |
e5a120ae | 608 | descriptor = NULL; |
470decc6 DK |
609 | while (commit_transaction->t_buffers) { |
610 | ||
611 | /* Find the next buffer to be journaled... */ | |
612 | ||
613 | jh = commit_transaction->t_buffers; | |
614 | ||
615 | /* If we're in abort mode, we just un-journal the buffer and | |
7ad7445f | 616 | release it. */ |
470decc6 DK |
617 | |
618 | if (is_journal_aborted(journal)) { | |
7ad7445f | 619 | clear_buffer_jbddirty(jh2bh(jh)); |
470decc6 | 620 | JBUFFER_TRACE(jh, "journal is aborting: refile"); |
e06c8227 JB |
621 | jbd2_buffer_abort_trigger(jh, |
622 | jh->b_frozen_data ? | |
623 | jh->b_frozen_triggers : | |
624 | jh->b_triggers); | |
f7f4bccb | 625 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
626 | /* If that was the last one, we need to clean up |
627 | * any descriptor buffers which may have been | |
628 | * already allocated, even if we are now | |
629 | * aborting. */ | |
630 | if (!commit_transaction->t_buffers) | |
631 | goto start_journal_io; | |
632 | continue; | |
633 | } | |
634 | ||
635 | /* Make sure we have a descriptor block in which to | |
636 | record the metadata buffer. */ | |
637 | ||
638 | if (!descriptor) { | |
470decc6 DK |
639 | J_ASSERT (bufs == 0); |
640 | ||
f2a44523 | 641 | jbd_debug(4, "JBD2: get descriptor\n"); |
470decc6 | 642 | |
32ab6715 JK |
643 | descriptor = jbd2_journal_get_descriptor_buffer( |
644 | commit_transaction, | |
645 | JBD2_DESCRIPTOR_BLOCK); | |
470decc6 | 646 | if (!descriptor) { |
a7fa2baf | 647 | jbd2_journal_abort(journal, -EIO); |
470decc6 DK |
648 | continue; |
649 | } | |
650 | ||
f2a44523 | 651 | jbd_debug(4, "JBD2: got buffer %llu (%p)\n", |
e5a120ae JK |
652 | (unsigned long long)descriptor->b_blocknr, |
653 | descriptor->b_data); | |
e5a120ae JK |
654 | tagp = &descriptor->b_data[sizeof(journal_header_t)]; |
655 | space_left = descriptor->b_size - | |
656 | sizeof(journal_header_t); | |
470decc6 | 657 | first_tag = 1; |
e5a120ae JK |
658 | set_buffer_jwrite(descriptor); |
659 | set_buffer_dirty(descriptor); | |
660 | wbuf[bufs++] = descriptor; | |
470decc6 DK |
661 | |
662 | /* Record it so that we can wait for IO | |
663 | completion later */ | |
e5a120ae JK |
664 | BUFFER_TRACE(descriptor, "ph3: file as descriptor"); |
665 | jbd2_file_log_bh(&log_bufs, descriptor); | |
470decc6 DK |
666 | } |
667 | ||
668 | /* Where is the buffer to be written? */ | |
669 | ||
f7f4bccb | 670 | err = jbd2_journal_next_log_block(journal, &blocknr); |
470decc6 DK |
671 | /* If the block mapping failed, just abandon the buffer |
672 | and repeat this loop: we'll fall into the | |
673 | refile-on-abort condition above. */ | |
674 | if (err) { | |
a7fa2baf | 675 | jbd2_journal_abort(journal, err); |
470decc6 DK |
676 | continue; |
677 | } | |
678 | ||
679 | /* | |
680 | * start_this_handle() uses t_outstanding_credits to determine | |
0db45889 | 681 | * the free space in the log. |
470decc6 | 682 | */ |
a51dca9c | 683 | atomic_dec(&commit_transaction->t_outstanding_credits); |
470decc6 DK |
684 | |
685 | /* Bump b_count to prevent truncate from stumbling over | |
686 | the shadowed buffer! @@@ This can go if we ever get | |
f5113eff | 687 | rid of the shadow pairing of buffers. */ |
470decc6 DK |
688 | atomic_inc(&jh2bh(jh)->b_count); |
689 | ||
470decc6 | 690 | /* |
f5113eff JK |
691 | * Make a temporary IO buffer with which to write it out |
692 | * (this will requeue the metadata buffer to BJ_Shadow). | |
470decc6 | 693 | */ |
f5113eff | 694 | set_bit(BH_JWrite, &jh2bh(jh)->b_state); |
470decc6 | 695 | JBUFFER_TRACE(jh, "ph3: write metadata"); |
f7f4bccb | 696 | flags = jbd2_journal_write_metadata_buffer(commit_transaction, |
f5113eff | 697 | jh, &wbuf[bufs], blocknr); |
e6ec116b TT |
698 | if (flags < 0) { |
699 | jbd2_journal_abort(journal, flags); | |
700 | continue; | |
701 | } | |
f5113eff | 702 | jbd2_file_log_bh(&io_bufs, wbuf[bufs]); |
470decc6 DK |
703 | |
704 | /* Record the new block's tag in the current descriptor | |
705 | buffer */ | |
706 | ||
707 | tag_flag = 0; | |
708 | if (flags & 1) | |
f7f4bccb | 709 | tag_flag |= JBD2_FLAG_ESCAPE; |
470decc6 | 710 | if (!first_tag) |
f7f4bccb | 711 | tag_flag |= JBD2_FLAG_SAME_UUID; |
470decc6 DK |
712 | |
713 | tag = (journal_block_tag_t *) tagp; | |
db9ee220 | 714 | write_tag_block(journal, tag, jh2bh(jh)->b_blocknr); |
8f888ef8 | 715 | tag->t_flags = cpu_to_be16(tag_flag); |
f5113eff | 716 | jbd2_block_tag_csum_set(journal, tag, wbuf[bufs], |
c3900875 | 717 | commit_transaction->t_tid); |
b517bea1 ZB |
718 | tagp += tag_bytes; |
719 | space_left -= tag_bytes; | |
f5113eff | 720 | bufs++; |
470decc6 DK |
721 | |
722 | if (first_tag) { | |
723 | memcpy (tagp, journal->j_uuid, 16); | |
724 | tagp += 16; | |
725 | space_left -= 16; | |
726 | first_tag = 0; | |
727 | } | |
728 | ||
729 | /* If there's no more to do, or if the descriptor is full, | |
730 | let the IO rip! */ | |
731 | ||
732 | if (bufs == journal->j_wbufsize || | |
733 | commit_transaction->t_buffers == NULL || | |
3caa487f | 734 | space_left < tag_bytes + 16 + csum_size) { |
470decc6 | 735 | |
f2a44523 | 736 | jbd_debug(4, "JBD2: Submit %d IOs\n", bufs); |
470decc6 DK |
737 | |
738 | /* Write an end-of-descriptor marker before | |
739 | submitting the IOs. "tag" still points to | |
740 | the last tag we set up. */ | |
741 | ||
8f888ef8 | 742 | tag->t_flags |= cpu_to_be16(JBD2_FLAG_LAST_TAG); |
470decc6 | 743 | start_journal_io: |
6e876c3d | 744 | if (descriptor) |
745 | jbd2_descriptor_block_csum_set(journal, | |
746 | descriptor); | |
747 | ||
470decc6 DK |
748 | for (i = 0; i < bufs; i++) { |
749 | struct buffer_head *bh = wbuf[i]; | |
818d276c GS |
750 | /* |
751 | * Compute checksum. | |
752 | */ | |
56316a0d | 753 | if (jbd2_has_feature_checksum(journal)) { |
818d276c GS |
754 | crc32_sum = |
755 | jbd2_checksum_data(crc32_sum, bh); | |
756 | } | |
757 | ||
470decc6 DK |
758 | lock_buffer(bh); |
759 | clear_buffer_dirty(bh); | |
760 | set_buffer_uptodate(bh); | |
761 | bh->b_end_io = journal_end_buffer_io_sync; | |
70fd7614 | 762 | submit_bh(REQ_OP_WRITE, REQ_SYNC, bh); |
470decc6 DK |
763 | } |
764 | cond_resched(); | |
765 | ||
766 | /* Force a new descriptor to be generated next | |
767 | time round the loop. */ | |
768 | descriptor = NULL; | |
769 | bufs = 0; | |
770 | } | |
771 | } | |
772 | ||
f73bee49 JK |
773 | err = journal_finish_inode_data_buffers(journal, commit_transaction); |
774 | if (err) { | |
775 | printk(KERN_WARNING | |
776 | "JBD2: Detected IO errors while flushing file data " | |
777 | "on %s\n", journal->j_devname); | |
778 | if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR) | |
779 | jbd2_journal_abort(journal, err); | |
780 | err = 0; | |
781 | } | |
782 | ||
3339578f JK |
783 | /* |
784 | * Get current oldest transaction in the log before we issue flush | |
785 | * to the filesystem device. After the flush we can be sure that | |
786 | * blocks of all older transactions are checkpointed to persistent | |
787 | * storage and we will be safe to update journal start in the | |
788 | * superblock with the numbers we get here. | |
789 | */ | |
790 | update_tail = | |
791 | jbd2_journal_get_log_tail(journal, &first_tid, &first_block); | |
792 | ||
bbd2be36 | 793 | write_lock(&journal->j_state_lock); |
3339578f JK |
794 | if (update_tail) { |
795 | long freed = first_block - journal->j_tail; | |
796 | ||
797 | if (first_block < journal->j_tail) | |
798 | freed += journal->j_last - journal->j_first; | |
799 | /* Update tail only if we free significant amount of space */ | |
ede7dc7f | 800 | if (freed < jbd2_journal_get_max_txn_bufs(journal)) |
3339578f JK |
801 | update_tail = 0; |
802 | } | |
bbd2be36 JK |
803 | J_ASSERT(commit_transaction->t_state == T_COMMIT); |
804 | commit_transaction->t_state = T_COMMIT_DFLUSH; | |
805 | write_unlock(&journal->j_state_lock); | |
3339578f | 806 | |
4f981868 | 807 | /* |
cc3e1bea TT |
808 | * If the journal is not located on the file system device, |
809 | * then we must flush the file system device before we issue | |
810 | * the commit record | |
811 | */ | |
81be12c8 | 812 | if (commit_transaction->t_need_data_flush && |
cc3e1bea TT |
813 | (journal->j_fs_dev != journal->j_dev) && |
814 | (journal->j_flags & JBD2_BARRIER)) | |
c6bf3f0e | 815 | blkdev_issue_flush(journal->j_fs_dev); |
818d276c | 816 | |
cc3e1bea | 817 | /* Done it all: now write the commit record asynchronously. */ |
56316a0d | 818 | if (jbd2_has_feature_async_commit(journal)) { |
818d276c GS |
819 | err = journal_submit_commit_record(journal, commit_transaction, |
820 | &cbh, crc32_sum); | |
821 | if (err) | |
d0a186e0 | 822 | jbd2_journal_abort(journal, err); |
e9e34f4e | 823 | } |
c851ed54 | 824 | |
82f04ab4 JA |
825 | blk_finish_plug(&plug); |
826 | ||
470decc6 DK |
827 | /* Lo and behold: we have just managed to send a transaction to |
828 | the log. Before we can commit it, wait for the IO so far to | |
829 | complete. Control buffers being written are on the | |
830 | transaction's t_log_list queue, and metadata buffers are on | |
f5113eff | 831 | the io_bufs list. |
470decc6 DK |
832 | |
833 | Wait for the buffers in reverse order. That way we are | |
834 | less likely to be woken up until all IOs have completed, and | |
835 | so we incur less scheduling load. | |
836 | */ | |
837 | ||
f2a44523 | 838 | jbd_debug(3, "JBD2: commit phase 3\n"); |
470decc6 | 839 | |
f5113eff JK |
840 | while (!list_empty(&io_bufs)) { |
841 | struct buffer_head *bh = list_entry(io_bufs.prev, | |
842 | struct buffer_head, | |
843 | b_assoc_buffers); | |
470decc6 | 844 | |
f5113eff JK |
845 | wait_on_buffer(bh); |
846 | cond_resched(); | |
470decc6 DK |
847 | |
848 | if (unlikely(!buffer_uptodate(bh))) | |
849 | err = -EIO; | |
f5113eff | 850 | jbd2_unfile_log_bh(bh); |
015c6033 | 851 | stats.run.rs_blocks_logged++; |
470decc6 DK |
852 | |
853 | /* | |
f5113eff JK |
854 | * The list contains temporary buffer heads created by |
855 | * jbd2_journal_write_metadata_buffer(). | |
470decc6 DK |
856 | */ |
857 | BUFFER_TRACE(bh, "dumping temporary bh"); | |
470decc6 DK |
858 | __brelse(bh); |
859 | J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0); | |
860 | free_buffer_head(bh); | |
861 | ||
f5113eff | 862 | /* We also have to refile the corresponding shadowed buffer */ |
470decc6 DK |
863 | jh = commit_transaction->t_shadow_list->b_tprev; |
864 | bh = jh2bh(jh); | |
f5113eff | 865 | clear_buffer_jwrite(bh); |
470decc6 | 866 | J_ASSERT_BH(bh, buffer_jbddirty(bh)); |
b34090e5 | 867 | J_ASSERT_BH(bh, !buffer_shadow(bh)); |
470decc6 DK |
868 | |
869 | /* The metadata is now released for reuse, but we need | |
870 | to remember it against this transaction so that when | |
871 | we finally commit, we can do any checkpointing | |
872 | required. */ | |
873 | JBUFFER_TRACE(jh, "file as BJ_Forget"); | |
f7f4bccb | 874 | jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget); |
470decc6 DK |
875 | JBUFFER_TRACE(jh, "brelse shadowed buffer"); |
876 | __brelse(bh); | |
877 | } | |
878 | ||
879 | J_ASSERT (commit_transaction->t_shadow_list == NULL); | |
880 | ||
f2a44523 | 881 | jbd_debug(3, "JBD2: commit phase 4\n"); |
470decc6 DK |
882 | |
883 | /* Here we wait for the revoke record and descriptor record buffers */ | |
e5a120ae | 884 | while (!list_empty(&log_bufs)) { |
470decc6 DK |
885 | struct buffer_head *bh; |
886 | ||
e5a120ae JK |
887 | bh = list_entry(log_bufs.prev, struct buffer_head, b_assoc_buffers); |
888 | wait_on_buffer(bh); | |
889 | cond_resched(); | |
470decc6 DK |
890 | |
891 | if (unlikely(!buffer_uptodate(bh))) | |
892 | err = -EIO; | |
893 | ||
894 | BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile"); | |
895 | clear_buffer_jwrite(bh); | |
e5a120ae | 896 | jbd2_unfile_log_bh(bh); |
015c6033 | 897 | stats.run.rs_blocks_logged++; |
470decc6 DK |
898 | __brelse(bh); /* One for getblk */ |
899 | /* AKPM: bforget here */ | |
900 | } | |
901 | ||
77e841de HK |
902 | if (err) |
903 | jbd2_journal_abort(journal, err); | |
904 | ||
f2a44523 | 905 | jbd_debug(3, "JBD2: commit phase 5\n"); |
bbd2be36 JK |
906 | write_lock(&journal->j_state_lock); |
907 | J_ASSERT(commit_transaction->t_state == T_COMMIT_DFLUSH); | |
908 | commit_transaction->t_state = T_COMMIT_JFLUSH; | |
909 | write_unlock(&journal->j_state_lock); | |
470decc6 | 910 | |
56316a0d | 911 | if (!jbd2_has_feature_async_commit(journal)) { |
818d276c GS |
912 | err = journal_submit_commit_record(journal, commit_transaction, |
913 | &cbh, crc32_sum); | |
914 | if (err) | |
d0a186e0 | 915 | jbd2_journal_abort(journal, err); |
818d276c | 916 | } |
6cba611e | 917 | if (cbh) |
fd98496f | 918 | err = journal_wait_on_commit_record(journal, cbh); |
015c6033 | 919 | stats.run.rs_blocks_logged++; |
56316a0d | 920 | if (jbd2_has_feature_async_commit(journal) && |
f73bee49 | 921 | journal->j_flags & JBD2_BARRIER) { |
c6bf3f0e | 922 | blkdev_issue_flush(journal->j_dev); |
f73bee49 | 923 | } |
470decc6 DK |
924 | |
925 | if (err) | |
a7fa2baf | 926 | jbd2_journal_abort(journal, err); |
470decc6 | 927 | |
9f356e5a JK |
928 | WARN_ON_ONCE( |
929 | atomic_read(&commit_transaction->t_outstanding_credits) < 0); | |
930 | ||
3339578f JK |
931 | /* |
932 | * Now disk caches for filesystem device are flushed so we are safe to | |
933 | * erase checkpointed transactions from the log by updating journal | |
934 | * superblock. | |
935 | */ | |
936 | if (update_tail) | |
937 | jbd2_update_log_tail(journal, first_tid, first_block); | |
938 | ||
470decc6 DK |
939 | /* End of a transaction! Finally, we can do checkpoint |
940 | processing: any buffers committed as a result of this | |
941 | transaction can be removed from any checkpoint list it was on | |
942 | before. */ | |
943 | ||
f2a44523 | 944 | jbd_debug(3, "JBD2: commit phase 6\n"); |
470decc6 | 945 | |
c851ed54 | 946 | J_ASSERT(list_empty(&commit_transaction->t_inode_list)); |
470decc6 DK |
947 | J_ASSERT(commit_transaction->t_buffers == NULL); |
948 | J_ASSERT(commit_transaction->t_checkpoint_list == NULL); | |
470decc6 | 949 | J_ASSERT(commit_transaction->t_shadow_list == NULL); |
470decc6 DK |
950 | |
951 | restart_loop: | |
952 | /* | |
953 | * As there are other places (journal_unmap_buffer()) adding buffers | |
954 | * to this list we have to be careful and hold the j_list_lock. | |
955 | */ | |
956 | spin_lock(&journal->j_list_lock); | |
957 | while (commit_transaction->t_forget) { | |
958 | transaction_t *cp_transaction; | |
959 | struct buffer_head *bh; | |
de1b7941 | 960 | int try_to_free = 0; |
93108ebb | 961 | bool drop_ref; |
470decc6 DK |
962 | |
963 | jh = commit_transaction->t_forget; | |
964 | spin_unlock(&journal->j_list_lock); | |
965 | bh = jh2bh(jh); | |
de1b7941 JK |
966 | /* |
967 | * Get a reference so that bh cannot be freed before we are | |
968 | * done with it. | |
969 | */ | |
970 | get_bh(bh); | |
46417064 | 971 | spin_lock(&jh->b_state_lock); |
23e2af35 | 972 | J_ASSERT_JH(jh, jh->b_transaction == commit_transaction); |
470decc6 DK |
973 | |
974 | /* | |
975 | * If there is undo-protected committed data against | |
976 | * this buffer, then we can remove it now. If it is a | |
977 | * buffer needing such protection, the old frozen_data | |
978 | * field now points to a committed version of the | |
979 | * buffer, so rotate that field to the new committed | |
980 | * data. | |
981 | * | |
982 | * Otherwise, we can just throw away the frozen data now. | |
e06c8227 JB |
983 | * |
984 | * We also know that the frozen data has already fired | |
985 | * its triggers if they exist, so we can clear that too. | |
470decc6 DK |
986 | */ |
987 | if (jh->b_committed_data) { | |
af1e76d6 | 988 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
989 | jh->b_committed_data = NULL; |
990 | if (jh->b_frozen_data) { | |
991 | jh->b_committed_data = jh->b_frozen_data; | |
992 | jh->b_frozen_data = NULL; | |
e06c8227 | 993 | jh->b_frozen_triggers = NULL; |
470decc6 DK |
994 | } |
995 | } else if (jh->b_frozen_data) { | |
af1e76d6 | 996 | jbd2_free(jh->b_frozen_data, bh->b_size); |
470decc6 | 997 | jh->b_frozen_data = NULL; |
e06c8227 | 998 | jh->b_frozen_triggers = NULL; |
470decc6 DK |
999 | } |
1000 | ||
1001 | spin_lock(&journal->j_list_lock); | |
1002 | cp_transaction = jh->b_cp_transaction; | |
1003 | if (cp_transaction) { | |
1004 | JBUFFER_TRACE(jh, "remove from old cp transaction"); | |
8e85fb3f | 1005 | cp_transaction->t_chp_stats.cs_dropped++; |
f7f4bccb | 1006 | __jbd2_journal_remove_checkpoint(jh); |
470decc6 DK |
1007 | } |
1008 | ||
1009 | /* Only re-checkpoint the buffer_head if it is marked | |
1010 | * dirty. If the buffer was added to the BJ_Forget list | |
f7f4bccb | 1011 | * by jbd2_journal_forget, it may no longer be dirty and |
470decc6 DK |
1012 | * there's no point in keeping a checkpoint record for |
1013 | * it. */ | |
1014 | ||
b794e7a6 | 1015 | /* |
6a66a7de | 1016 | * A buffer which has been freed while still being journaled |
1017 | * by a previous transaction, refile the buffer to BJ_Forget of | |
1018 | * the running transaction. If the just committed transaction | |
1019 | * contains "add to orphan" operation, we can completely | |
1020 | * invalidate the buffer now. We are rather through in that | |
1021 | * since the buffer may be still accessible when blocksize < | |
1022 | * pagesize and it is attached to the last partial page. | |
1023 | */ | |
1024 | if (buffer_freed(bh) && !jh->b_next_transaction) { | |
c96dceea | 1025 | struct address_space *mapping; |
1026 | ||
6a66a7de | 1027 | clear_buffer_freed(bh); |
1028 | clear_buffer_jbddirty(bh); | |
c96dceea | 1029 | |
1030 | /* | |
1031 | * Block device buffers need to stay mapped all the | |
1032 | * time, so it is enough to clear buffer_jbddirty and | |
1033 | * buffer_freed bits. For the file mapping buffers (i.e. | |
1034 | * journalled data) we need to unmap buffer and clear | |
1035 | * more bits. We also need to be careful about the check | |
1036 | * because the data page mapping can get cleared under | |
780f66e5 | 1037 | * our hands. Note that if mapping == NULL, we don't |
1038 | * need to make buffer unmapped because the page is | |
1039 | * already detached from the mapping and buffers cannot | |
1040 | * get reused. | |
c96dceea | 1041 | */ |
1042 | mapping = READ_ONCE(bh->b_page->mapping); | |
1043 | if (mapping && !sb_is_blkdev_sb(mapping->host->i_sb)) { | |
1044 | clear_buffer_mapped(bh); | |
1045 | clear_buffer_new(bh); | |
1046 | clear_buffer_req(bh); | |
1047 | bh->b_bdev = NULL; | |
1048 | } | |
470decc6 DK |
1049 | } |
1050 | ||
1051 | if (buffer_jbddirty(bh)) { | |
1052 | JBUFFER_TRACE(jh, "add to new checkpointing trans"); | |
f7f4bccb | 1053 | __jbd2_journal_insert_checkpoint(jh, commit_transaction); |
7ad7445f HK |
1054 | if (is_journal_aborted(journal)) |
1055 | clear_buffer_jbddirty(bh); | |
470decc6 DK |
1056 | } else { |
1057 | J_ASSERT_BH(bh, !buffer_dirty(bh)); | |
de1b7941 JK |
1058 | /* |
1059 | * The buffer on BJ_Forget list and not jbddirty means | |
470decc6 DK |
1060 | * it has been freed by this transaction and hence it |
1061 | * could not have been reallocated until this | |
1062 | * transaction has committed. *BUT* it could be | |
1063 | * reallocated once we have written all the data to | |
1064 | * disk and before we process the buffer on BJ_Forget | |
de1b7941 JK |
1065 | * list. |
1066 | */ | |
1067 | if (!jh->b_next_transaction) | |
1068 | try_to_free = 1; | |
470decc6 | 1069 | } |
de1b7941 | 1070 | JBUFFER_TRACE(jh, "refile or unfile buffer"); |
93108ebb | 1071 | drop_ref = __jbd2_journal_refile_buffer(jh); |
46417064 | 1072 | spin_unlock(&jh->b_state_lock); |
93108ebb JK |
1073 | if (drop_ref) |
1074 | jbd2_journal_put_journal_head(jh); | |
de1b7941 JK |
1075 | if (try_to_free) |
1076 | release_buffer_page(bh); /* Drops bh reference */ | |
1077 | else | |
1078 | __brelse(bh); | |
470decc6 DK |
1079 | cond_resched_lock(&journal->j_list_lock); |
1080 | } | |
1081 | spin_unlock(&journal->j_list_lock); | |
1082 | /* | |
f5a7a6b0 JK |
1083 | * This is a bit sleazy. We use j_list_lock to protect transition |
1084 | * of a transaction into T_FINISHED state and calling | |
1085 | * __jbd2_journal_drop_transaction(). Otherwise we could race with | |
1086 | * other checkpointing code processing the transaction... | |
470decc6 | 1087 | */ |
a931da6a | 1088 | write_lock(&journal->j_state_lock); |
470decc6 DK |
1089 | spin_lock(&journal->j_list_lock); |
1090 | /* | |
1091 | * Now recheck if some buffers did not get attached to the transaction | |
1092 | * while the lock was dropped... | |
1093 | */ | |
1094 | if (commit_transaction->t_forget) { | |
1095 | spin_unlock(&journal->j_list_lock); | |
a931da6a | 1096 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
1097 | goto restart_loop; |
1098 | } | |
1099 | ||
d4e839d4 TT |
1100 | /* Add the transaction to the checkpoint list |
1101 | * __journal_remove_checkpoint() can not destroy transaction | |
1102 | * under us because it is not marked as T_FINISHED yet */ | |
1103 | if (journal->j_checkpoint_transactions == NULL) { | |
1104 | journal->j_checkpoint_transactions = commit_transaction; | |
1105 | commit_transaction->t_cpnext = commit_transaction; | |
1106 | commit_transaction->t_cpprev = commit_transaction; | |
1107 | } else { | |
1108 | commit_transaction->t_cpnext = | |
1109 | journal->j_checkpoint_transactions; | |
1110 | commit_transaction->t_cpprev = | |
1111 | commit_transaction->t_cpnext->t_cpprev; | |
1112 | commit_transaction->t_cpnext->t_cpprev = | |
1113 | commit_transaction; | |
1114 | commit_transaction->t_cpprev->t_cpnext = | |
1115 | commit_transaction; | |
1116 | } | |
1117 | spin_unlock(&journal->j_list_lock); | |
1118 | ||
470decc6 DK |
1119 | /* Done with this transaction! */ |
1120 | ||
f2a44523 | 1121 | jbd_debug(3, "JBD2: commit phase 7\n"); |
470decc6 | 1122 | |
bbd2be36 | 1123 | J_ASSERT(commit_transaction->t_state == T_COMMIT_JFLUSH); |
470decc6 | 1124 | |
8e85fb3f | 1125 | commit_transaction->t_start = jiffies; |
bf699327 TT |
1126 | stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging, |
1127 | commit_transaction->t_start); | |
8e85fb3f JL |
1128 | |
1129 | /* | |
bf699327 | 1130 | * File the transaction statistics |
8e85fb3f | 1131 | */ |
8e85fb3f | 1132 | stats.ts_tid = commit_transaction->t_tid; |
8dd42046 TT |
1133 | stats.run.rs_handle_count = |
1134 | atomic_read(&commit_transaction->t_handle_count); | |
bf699327 TT |
1135 | trace_jbd2_run_stats(journal->j_fs_dev->bd_dev, |
1136 | commit_transaction->t_tid, &stats.run); | |
42cf3452 | 1137 | stats.ts_requested = (commit_transaction->t_requested) ? 1 : 0; |
8e85fb3f | 1138 | |
794446c6 | 1139 | commit_transaction->t_state = T_COMMIT_CALLBACK; |
470decc6 DK |
1140 | J_ASSERT(commit_transaction == journal->j_committing_transaction); |
1141 | journal->j_commit_sequence = commit_transaction->t_tid; | |
1142 | journal->j_committing_transaction = NULL; | |
e07f7183 | 1143 | commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time)); |
470decc6 | 1144 | |
e07f7183 JB |
1145 | /* |
1146 | * weight the commit time higher than the average time so we don't | |
1147 | * react too strongly to vast changes in the commit time | |
1148 | */ | |
1149 | if (likely(journal->j_average_commit_time)) | |
1150 | journal->j_average_commit_time = (commit_time + | |
1151 | journal->j_average_commit_time*3) / 4; | |
1152 | else | |
1153 | journal->j_average_commit_time = commit_time; | |
794446c6 | 1154 | |
a931da6a | 1155 | write_unlock(&journal->j_state_lock); |
6c20ec85 | 1156 | |
fb68407b AK |
1157 | if (journal->j_commit_callback) |
1158 | journal->j_commit_callback(journal, commit_transaction); | |
ff780b91 | 1159 | if (journal->j_fc_cleanup_callback) |
e85c81ba | 1160 | journal->j_fc_cleanup_callback(journal, 1, commit_transaction->t_tid); |
fb68407b | 1161 | |
879c5e6b | 1162 | trace_jbd2_end_commit(journal, commit_transaction); |
f2a44523 | 1163 | jbd_debug(1, "JBD2: commit %d complete, head %d\n", |
470decc6 DK |
1164 | journal->j_commit_sequence, journal->j_tail_sequence); |
1165 | ||
794446c6 | 1166 | write_lock(&journal->j_state_lock); |
ff780b91 HS |
1167 | journal->j_flags &= ~JBD2_FULL_COMMIT_ONGOING; |
1168 | journal->j_flags &= ~JBD2_FAST_COMMIT_ONGOING; | |
794446c6 DM |
1169 | spin_lock(&journal->j_list_lock); |
1170 | commit_transaction->t_state = T_FINISHED; | |
d4e839d4 | 1171 | /* Check if the transaction can be dropped now that we are finished */ |
794446c6 DM |
1172 | if (commit_transaction->t_checkpoint_list == NULL && |
1173 | commit_transaction->t_checkpoint_io_list == NULL) { | |
1174 | __jbd2_journal_drop_transaction(journal, commit_transaction); | |
1175 | jbd2_journal_free_transaction(commit_transaction); | |
1176 | } | |
1177 | spin_unlock(&journal->j_list_lock); | |
1178 | write_unlock(&journal->j_state_lock); | |
470decc6 | 1179 | wake_up(&journal->j_wait_done_commit); |
ff780b91 | 1180 | wake_up(&journal->j_fc_wait); |
42cf3452 TT |
1181 | |
1182 | /* | |
1183 | * Calculate overall stats | |
1184 | */ | |
1185 | spin_lock(&journal->j_history_lock); | |
1186 | journal->j_stats.ts_tid++; | |
1187 | journal->j_stats.ts_requested += stats.ts_requested; | |
1188 | journal->j_stats.run.rs_wait += stats.run.rs_wait; | |
1189 | journal->j_stats.run.rs_request_delay += stats.run.rs_request_delay; | |
1190 | journal->j_stats.run.rs_running += stats.run.rs_running; | |
1191 | journal->j_stats.run.rs_locked += stats.run.rs_locked; | |
1192 | journal->j_stats.run.rs_flushing += stats.run.rs_flushing; | |
1193 | journal->j_stats.run.rs_logging += stats.run.rs_logging; | |
1194 | journal->j_stats.run.rs_handle_count += stats.run.rs_handle_count; | |
1195 | journal->j_stats.run.rs_blocks += stats.run.rs_blocks; | |
1196 | journal->j_stats.run.rs_blocks_logged += stats.run.rs_blocks_logged; | |
1197 | spin_unlock(&journal->j_history_lock); | |
470decc6 | 1198 | } |