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 | { | |
73122255 | 65 | struct folio *folio; |
470decc6 DK |
66 | |
67 | if (buffer_dirty(bh)) | |
68 | goto nope; | |
69 | if (atomic_read(&bh->b_count) != 1) | |
70 | goto nope; | |
0d22fe2f | 71 | folio = bh->b_folio; |
73122255 | 72 | if (folio->mapping) |
470decc6 DK |
73 | goto nope; |
74 | ||
75 | /* OK, it's a truncated page */ | |
73122255 | 76 | if (!folio_trylock(folio)) |
470decc6 DK |
77 | goto nope; |
78 | ||
73122255 | 79 | folio_get(folio); |
470decc6 | 80 | __brelse(bh); |
68189fef | 81 | try_to_free_buffers(folio); |
73122255 MWO |
82 | folio_unlock(folio); |
83 | folio_put(folio); | |
470decc6 DK |
84 | return; |
85 | ||
86 | nope: | |
87 | __brelse(bh); | |
88 | } | |
89 | ||
e5a120ae | 90 | static void jbd2_commit_block_csum_set(journal_t *j, struct buffer_head *bh) |
1f56c589 DW |
91 | { |
92 | struct commit_header *h; | |
93 | __u32 csum; | |
94 | ||
db9ee220 | 95 | if (!jbd2_journal_has_csum_v2or3(j)) |
1f56c589 DW |
96 | return; |
97 | ||
e5a120ae | 98 | h = (struct commit_header *)(bh->b_data); |
1f56c589 DW |
99 | h->h_chksum_type = 0; |
100 | h->h_chksum_size = 0; | |
101 | h->h_chksum[0] = 0; | |
e5a120ae | 102 | csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize); |
1f56c589 DW |
103 | h->h_chksum[0] = cpu_to_be32(csum); |
104 | } | |
105 | ||
818d276c GS |
106 | /* |
107 | * Done it all: now submit the commit record. We should have | |
470decc6 DK |
108 | * cleaned up our previous buffers by now, so if we are in abort |
109 | * mode we can now just skip the rest of the journal write | |
110 | * entirely. | |
111 | * | |
112 | * Returns 1 if the journal needs to be aborted or 0 on success | |
113 | */ | |
818d276c GS |
114 | static int journal_submit_commit_record(journal_t *journal, |
115 | transaction_t *commit_transaction, | |
116 | struct buffer_head **cbh, | |
117 | __u32 crc32_sum) | |
470decc6 | 118 | { |
818d276c | 119 | struct commit_header *tmp; |
470decc6 | 120 | struct buffer_head *bh; |
b42d1d6b | 121 | struct timespec64 now; |
f3ed5df3 | 122 | blk_opf_t write_flags = REQ_OP_WRITE | REQ_SYNC; |
470decc6 | 123 | |
6cba611e ZH |
124 | *cbh = NULL; |
125 | ||
470decc6 DK |
126 | if (is_journal_aborted(journal)) |
127 | return 0; | |
128 | ||
32ab6715 JK |
129 | bh = jbd2_journal_get_descriptor_buffer(commit_transaction, |
130 | JBD2_COMMIT_BLOCK); | |
e5a120ae | 131 | if (!bh) |
470decc6 DK |
132 | return 1; |
133 | ||
818d276c | 134 | tmp = (struct commit_header *)bh->b_data; |
b42d1d6b | 135 | ktime_get_coarse_real_ts64(&now); |
736603ab TT |
136 | tmp->h_commit_sec = cpu_to_be64(now.tv_sec); |
137 | tmp->h_commit_nsec = cpu_to_be32(now.tv_nsec); | |
818d276c | 138 | |
56316a0d | 139 | if (jbd2_has_feature_checksum(journal)) { |
818d276c GS |
140 | tmp->h_chksum_type = JBD2_CRC32_CHKSUM; |
141 | tmp->h_chksum_size = JBD2_CRC32_CHKSUM_SIZE; | |
142 | tmp->h_chksum[0] = cpu_to_be32(crc32_sum); | |
470decc6 | 143 | } |
e5a120ae | 144 | jbd2_commit_block_csum_set(journal, bh); |
470decc6 | 145 | |
e5a120ae | 146 | BUFFER_TRACE(bh, "submit commit block"); |
818d276c | 147 | lock_buffer(bh); |
45a90bfd | 148 | clear_buffer_dirty(bh); |
818d276c GS |
149 | set_buffer_uptodate(bh); |
150 | bh->b_end_io = journal_end_buffer_io_sync; | |
151 | ||
152 | if (journal->j_flags & JBD2_BARRIER && | |
56316a0d | 153 | !jbd2_has_feature_async_commit(journal)) |
f3ed5df3 | 154 | write_flags |= REQ_PREFLUSH | REQ_FUA; |
9c35575b | 155 | |
f3ed5df3 | 156 | submit_bh(write_flags, bh); |
818d276c | 157 | *cbh = bh; |
f3ed5df3 | 158 | return 0; |
818d276c GS |
159 | } |
160 | ||
161 | /* | |
162 | * This function along with journal_submit_commit_record | |
163 | * allows to write the commit record asynchronously. | |
164 | */ | |
fd98496f TT |
165 | static int journal_wait_on_commit_record(journal_t *journal, |
166 | struct buffer_head *bh) | |
818d276c GS |
167 | { |
168 | int ret = 0; | |
169 | ||
170 | clear_buffer_dirty(bh); | |
171 | wait_on_buffer(bh); | |
470decc6 | 172 | |
818d276c GS |
173 | if (unlikely(!buffer_uptodate(bh))) |
174 | ret = -EIO; | |
175 | put_bh(bh); /* One for getblk() */ | |
818d276c GS |
176 | |
177 | return ret; | |
470decc6 DK |
178 | } |
179 | ||
ff780b91 | 180 | /* Send all the data buffers related to an inode */ |
f30ff35f | 181 | int jbd2_submit_inode_data(journal_t *journal, struct jbd2_inode *jinode) |
ff780b91 | 182 | { |
ff780b91 HS |
183 | if (!jinode || !(jinode->i_flags & JI_WRITE_DATA)) |
184 | return 0; | |
185 | ||
186 | trace_jbd2_submit_inode_data(jinode->i_vfs_inode); | |
f30ff35f | 187 | return journal->j_submit_inode_data_buffers(jinode); |
ff780b91 HS |
188 | |
189 | } | |
190 | EXPORT_SYMBOL(jbd2_submit_inode_data); | |
191 | ||
192 | int jbd2_wait_inode_data(journal_t *journal, struct jbd2_inode *jinode) | |
193 | { | |
194 | if (!jinode || !(jinode->i_flags & JI_WAIT_DATA) || | |
195 | !jinode->i_vfs_inode || !jinode->i_vfs_inode->i_mapping) | |
196 | return 0; | |
197 | return filemap_fdatawait_range_keep_errors( | |
198 | jinode->i_vfs_inode->i_mapping, jinode->i_dirty_start, | |
199 | jinode->i_dirty_end); | |
200 | } | |
201 | EXPORT_SYMBOL(jbd2_wait_inode_data); | |
202 | ||
c851ed54 JK |
203 | /* |
204 | * Submit all the data buffers of inode associated with the transaction to | |
205 | * disk. | |
206 | * | |
207 | * We are in a committing transaction. Therefore no new inode can be added to | |
208 | * our inode list. We use JI_COMMIT_RUNNING flag to protect inode we currently | |
209 | * operate on from being released while we write out pages. | |
210 | */ | |
cd1aac32 | 211 | static int journal_submit_data_buffers(journal_t *journal, |
c851ed54 JK |
212 | transaction_t *commit_transaction) |
213 | { | |
214 | struct jbd2_inode *jinode; | |
215 | int err, ret = 0; | |
c851ed54 JK |
216 | |
217 | spin_lock(&journal->j_list_lock); | |
218 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { | |
41617e1a JK |
219 | if (!(jinode->i_flags & JI_WRITE_DATA)) |
220 | continue; | |
cb0d9d47 | 221 | jinode->i_flags |= JI_COMMIT_RUNNING; |
c851ed54 | 222 | spin_unlock(&journal->j_list_lock); |
342af94e | 223 | /* submit the inode data buffers. */ |
879c5e6b | 224 | trace_jbd2_submit_inode_data(jinode->i_vfs_inode); |
342af94e MFO |
225 | if (journal->j_submit_inode_data_buffers) { |
226 | err = journal->j_submit_inode_data_buffers(jinode); | |
227 | if (!ret) | |
228 | ret = err; | |
229 | } | |
c851ed54 JK |
230 | spin_lock(&journal->j_list_lock); |
231 | J_ASSERT(jinode->i_transaction == commit_transaction); | |
cb0d9d47 JK |
232 | jinode->i_flags &= ~JI_COMMIT_RUNNING; |
233 | smp_mb(); | |
c851ed54 JK |
234 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); |
235 | } | |
236 | spin_unlock(&journal->j_list_lock); | |
237 | return ret; | |
238 | } | |
239 | ||
aa3c0c61 MFO |
240 | int jbd2_journal_finish_inode_data_buffers(struct jbd2_inode *jinode) |
241 | { | |
242 | struct address_space *mapping = jinode->i_vfs_inode->i_mapping; | |
243 | ||
244 | return filemap_fdatawait_range_keep_errors(mapping, | |
245 | jinode->i_dirty_start, | |
246 | jinode->i_dirty_end); | |
247 | } | |
248 | ||
c851ed54 JK |
249 | /* |
250 | * Wait for data submitted for writeout, refile inodes to proper | |
251 | * transaction if needed. | |
252 | * | |
253 | */ | |
254 | static int journal_finish_inode_data_buffers(journal_t *journal, | |
255 | transaction_t *commit_transaction) | |
256 | { | |
257 | struct jbd2_inode *jinode, *next_i; | |
258 | int err, ret = 0; | |
259 | ||
cd1aac32 | 260 | /* For locking, see the comment in journal_submit_data_buffers() */ |
c851ed54 JK |
261 | spin_lock(&journal->j_list_lock); |
262 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { | |
41617e1a JK |
263 | if (!(jinode->i_flags & JI_WAIT_DATA)) |
264 | continue; | |
cb0d9d47 | 265 | jinode->i_flags |= JI_COMMIT_RUNNING; |
c851ed54 | 266 | spin_unlock(&journal->j_list_lock); |
342af94e MFO |
267 | /* wait for the inode data buffers writeout. */ |
268 | if (journal->j_finish_inode_data_buffers) { | |
269 | err = journal->j_finish_inode_data_buffers(jinode); | |
270 | if (!ret) | |
271 | ret = err; | |
272 | } | |
c851ed54 | 273 | spin_lock(&journal->j_list_lock); |
cb0d9d47 JK |
274 | jinode->i_flags &= ~JI_COMMIT_RUNNING; |
275 | smp_mb(); | |
c851ed54 JK |
276 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); |
277 | } | |
278 | ||
279 | /* Now refile inode to proper lists */ | |
280 | list_for_each_entry_safe(jinode, next_i, | |
281 | &commit_transaction->t_inode_list, i_list) { | |
282 | list_del(&jinode->i_list); | |
283 | if (jinode->i_next_transaction) { | |
284 | jinode->i_transaction = jinode->i_next_transaction; | |
285 | jinode->i_next_transaction = NULL; | |
286 | list_add(&jinode->i_list, | |
287 | &jinode->i_transaction->t_inode_list); | |
288 | } else { | |
289 | jinode->i_transaction = NULL; | |
6ba0e7dc RZ |
290 | jinode->i_dirty_start = 0; |
291 | jinode->i_dirty_end = 0; | |
c851ed54 JK |
292 | } |
293 | } | |
294 | spin_unlock(&journal->j_list_lock); | |
295 | ||
296 | return ret; | |
297 | } | |
298 | ||
818d276c GS |
299 | static __u32 jbd2_checksum_data(__u32 crc32_sum, struct buffer_head *bh) |
300 | { | |
301 | struct page *page = bh->b_page; | |
302 | char *addr; | |
303 | __u32 checksum; | |
304 | ||
303a8f2a | 305 | addr = kmap_atomic(page); |
818d276c GS |
306 | checksum = crc32_be(crc32_sum, |
307 | (void *)(addr + offset_in_page(bh->b_data)), bh->b_size); | |
303a8f2a | 308 | kunmap_atomic(addr); |
818d276c GS |
309 | |
310 | return checksum; | |
311 | } | |
312 | ||
db9ee220 | 313 | static void write_tag_block(journal_t *j, journal_block_tag_t *tag, |
18eba7aa | 314 | unsigned long long block) |
b517bea1 ZB |
315 | { |
316 | tag->t_blocknr = cpu_to_be32(block & (u32)~0); | |
56316a0d | 317 | if (jbd2_has_feature_64bit(j)) |
b517bea1 ZB |
318 | tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1); |
319 | } | |
320 | ||
c3900875 DW |
321 | static void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag, |
322 | struct buffer_head *bh, __u32 sequence) | |
323 | { | |
db9ee220 | 324 | journal_block_tag3_t *tag3 = (journal_block_tag3_t *)tag; |
c3900875 DW |
325 | struct page *page = bh->b_page; |
326 | __u8 *addr; | |
eee06c56 | 327 | __u32 csum32; |
18a6ea1e | 328 | __be32 seq; |
c3900875 | 329 | |
db9ee220 | 330 | if (!jbd2_journal_has_csum_v2or3(j)) |
c3900875 DW |
331 | return; |
332 | ||
18a6ea1e | 333 | seq = cpu_to_be32(sequence); |
906adea1 | 334 | addr = kmap_atomic(page); |
18a6ea1e | 335 | csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&seq, sizeof(seq)); |
eee06c56 DW |
336 | csum32 = jbd2_chksum(j, csum32, addr + offset_in_page(bh->b_data), |
337 | bh->b_size); | |
906adea1 | 338 | kunmap_atomic(addr); |
c3900875 | 339 | |
56316a0d | 340 | if (jbd2_has_feature_csum3(j)) |
db9ee220 DW |
341 | tag3->t_checksum = cpu_to_be32(csum32); |
342 | else | |
343 | tag->t_checksum = cpu_to_be16(csum32); | |
c3900875 | 344 | } |
470decc6 | 345 | /* |
f7f4bccb | 346 | * jbd2_journal_commit_transaction |
470decc6 DK |
347 | * |
348 | * The primary function for committing a transaction to the log. This | |
349 | * function is called by the journal thread to begin a complete commit. | |
350 | */ | |
f7f4bccb | 351 | void jbd2_journal_commit_transaction(journal_t *journal) |
470decc6 | 352 | { |
8e85fb3f | 353 | struct transaction_stats_s stats; |
470decc6 | 354 | transaction_t *commit_transaction; |
e5a120ae JK |
355 | struct journal_head *jh; |
356 | struct buffer_head *descriptor; | |
470decc6 DK |
357 | struct buffer_head **wbuf = journal->j_wbuf; |
358 | int bufs; | |
359 | int flags; | |
360 | int err; | |
18eba7aa | 361 | unsigned long long blocknr; |
e07f7183 JB |
362 | ktime_t start_time; |
363 | u64 commit_time; | |
470decc6 | 364 | char *tagp = NULL; |
470decc6 DK |
365 | journal_block_tag_t *tag = NULL; |
366 | int space_left = 0; | |
367 | int first_tag = 0; | |
368 | int tag_flag; | |
794446c6 | 369 | int i; |
b517bea1 | 370 | int tag_bytes = journal_tag_bytes(journal); |
818d276c GS |
371 | struct buffer_head *cbh = NULL; /* For transactional checksums */ |
372 | __u32 crc32_sum = ~0; | |
82f04ab4 | 373 | struct blk_plug plug; |
3339578f JK |
374 | /* Tail of the journal */ |
375 | unsigned long first_block; | |
376 | tid_t first_tid; | |
377 | int update_tail; | |
3caa487f | 378 | int csum_size = 0; |
f5113eff | 379 | LIST_HEAD(io_bufs); |
e5a120ae | 380 | LIST_HEAD(log_bufs); |
3caa487f | 381 | |
db9ee220 | 382 | if (jbd2_journal_has_csum_v2or3(journal)) |
3caa487f | 383 | csum_size = sizeof(struct jbd2_journal_block_tail); |
470decc6 DK |
384 | |
385 | /* | |
386 | * First job: lock down the current transaction and wait for | |
387 | * all outstanding updates to complete. | |
388 | */ | |
389 | ||
f7f4bccb MC |
390 | /* Do we need to erase the effects of a prior jbd2_journal_flush? */ |
391 | if (journal->j_flags & JBD2_FLUSHED) { | |
cb3b3bf2 | 392 | jbd2_debug(3, "super block updated\n"); |
6fa7aa50 | 393 | mutex_lock_io(&journal->j_checkpoint_mutex); |
79feb521 JK |
394 | /* |
395 | * We hold j_checkpoint_mutex so tail cannot change under us. | |
396 | * We don't need any special data guarantees for writing sb | |
397 | * since journal is empty and it is ok for write to be | |
398 | * flushed only with transaction commit. | |
399 | */ | |
400 | jbd2_journal_update_sb_log_tail(journal, | |
401 | journal->j_tail_sequence, | |
402 | journal->j_tail, | |
70fd7614 | 403 | REQ_SYNC); |
a78bb11d | 404 | mutex_unlock(&journal->j_checkpoint_mutex); |
470decc6 | 405 | } else { |
cb3b3bf2 | 406 | jbd2_debug(3, "superblock not updated\n"); |
470decc6 DK |
407 | } |
408 | ||
409 | J_ASSERT(journal->j_running_transaction != NULL); | |
410 | J_ASSERT(journal->j_committing_transaction == NULL); | |
411 | ||
ff780b91 HS |
412 | write_lock(&journal->j_state_lock); |
413 | journal->j_flags |= JBD2_FULL_COMMIT_ONGOING; | |
414 | while (journal->j_flags & JBD2_FAST_COMMIT_ONGOING) { | |
415 | DEFINE_WAIT(wait); | |
416 | ||
417 | prepare_to_wait(&journal->j_fc_wait, &wait, | |
418 | TASK_UNINTERRUPTIBLE); | |
419 | write_unlock(&journal->j_state_lock); | |
420 | schedule(); | |
421 | write_lock(&journal->j_state_lock); | |
422 | finish_wait(&journal->j_fc_wait, &wait); | |
cc80586a HS |
423 | /* |
424 | * TODO: by blocking fast commits here, we are increasing | |
425 | * fsync() latency slightly. Strictly speaking, we don't need | |
426 | * to block fast commits until the transaction enters T_FLUSH | |
427 | * state. So an optimization is possible where we block new fast | |
428 | * commits here and wait for existing ones to complete | |
429 | * just before we enter T_FLUSH. That way, the existing fast | |
430 | * commits and this full commit can proceed parallely. | |
431 | */ | |
ff780b91 HS |
432 | } |
433 | write_unlock(&journal->j_state_lock); | |
434 | ||
470decc6 | 435 | commit_transaction = journal->j_running_transaction; |
470decc6 | 436 | |
879c5e6b | 437 | trace_jbd2_start_commit(journal, commit_transaction); |
cb3b3bf2 | 438 | jbd2_debug(1, "JBD2: starting commit of transaction %d\n", |
470decc6 DK |
439 | commit_transaction->t_tid); |
440 | ||
a931da6a | 441 | write_lock(&journal->j_state_lock); |
ff780b91 | 442 | journal->j_fc_off = 0; |
3ca841c1 | 443 | J_ASSERT(commit_transaction->t_state == T_RUNNING); |
470decc6 DK |
444 | commit_transaction->t_state = T_LOCKED; |
445 | ||
879c5e6b | 446 | trace_jbd2_commit_locking(journal, commit_transaction); |
bf699327 | 447 | stats.run.rs_wait = commit_transaction->t_max_wait; |
9fff24aa | 448 | stats.run.rs_request_delay = 0; |
bf699327 | 449 | stats.run.rs_locked = jiffies; |
9fff24aa TT |
450 | if (commit_transaction->t_requested) |
451 | stats.run.rs_request_delay = | |
452 | jbd2_time_diff(commit_transaction->t_requested, | |
453 | stats.run.rs_locked); | |
bf699327 TT |
454 | stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start, |
455 | stats.run.rs_locked); | |
8e85fb3f | 456 | |
4f981868 RH |
457 | // waits for any t_updates to finish |
458 | jbd2_journal_wait_updates(journal); | |
470decc6 | 459 | |
96f1e097 | 460 | commit_transaction->t_state = T_SWITCH; |
470decc6 | 461 | |
a51dca9c | 462 | J_ASSERT (atomic_read(&commit_transaction->t_outstanding_credits) <= |
470decc6 DK |
463 | journal->j_max_transaction_buffers); |
464 | ||
465 | /* | |
466 | * First thing we are allowed to do is to discard any remaining | |
467 | * BJ_Reserved buffers. Note, it is _not_ permissible to assume | |
468 | * that there are no such buffers: if a large filesystem | |
469 | * operation like a truncate needs to split itself over multiple | |
f7f4bccb | 470 | * transactions, then it may try to do a jbd2_journal_restart() while |
470decc6 DK |
471 | * there are still BJ_Reserved buffers outstanding. These must |
472 | * be released cleanly from the current transaction. | |
473 | * | |
474 | * In this case, the filesystem must still reserve write access | |
475 | * again before modifying the buffer in the new transaction, but | |
476 | * we do not require it to remember exactly which old buffers it | |
477 | * has reserved. This is consistent with the existing behaviour | |
f7f4bccb | 478 | * that multiple jbd2_journal_get_write_access() calls to the same |
25985edc | 479 | * buffer are perfectly permissible. |
23e3d7f7 YB |
480 | * We use journal->j_state_lock here to serialize processing of |
481 | * t_reserved_list with eviction of buffers from journal_unmap_buffer(). | |
470decc6 DK |
482 | */ |
483 | while (commit_transaction->t_reserved_list) { | |
484 | jh = commit_transaction->t_reserved_list; | |
485 | JBUFFER_TRACE(jh, "reserved, unused: refile"); | |
486 | /* | |
f7f4bccb | 487 | * A jbd2_journal_get_undo_access()+jbd2_journal_release_buffer() may |
470decc6 DK |
488 | * leave undo-committed data. |
489 | */ | |
490 | if (jh->b_committed_data) { | |
491 | struct buffer_head *bh = jh2bh(jh); | |
492 | ||
46417064 | 493 | spin_lock(&jh->b_state_lock); |
af1e76d6 | 494 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 | 495 | jh->b_committed_data = NULL; |
46417064 | 496 | spin_unlock(&jh->b_state_lock); |
470decc6 | 497 | } |
f7f4bccb | 498 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
499 | } |
500 | ||
23e3d7f7 | 501 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
502 | /* |
503 | * Now try to drop any written-back buffers from the journal's | |
504 | * checkpoint lists. We do this *before* commit because it potentially | |
505 | * frees some memory | |
506 | */ | |
507 | spin_lock(&journal->j_list_lock); | |
841df7df | 508 | __jbd2_journal_clean_checkpoint_list(journal, false); |
470decc6 DK |
509 | spin_unlock(&journal->j_list_lock); |
510 | ||
cb3b3bf2 | 511 | jbd2_debug(3, "JBD2: commit phase 1\n"); |
470decc6 | 512 | |
1ba37268 YY |
513 | /* |
514 | * Clear revoked flag to reflect there is no revoked buffers | |
515 | * in the next transaction which is going to be started. | |
516 | */ | |
517 | jbd2_clear_buffer_revoked_flags(journal); | |
518 | ||
470decc6 DK |
519 | /* |
520 | * Switch to a new revoke table. | |
521 | */ | |
f7f4bccb | 522 | jbd2_journal_switch_revoke_table(journal); |
470decc6 | 523 | |
a89573ce | 524 | write_lock(&journal->j_state_lock); |
8f7d89f3 JK |
525 | /* |
526 | * Reserved credits cannot be claimed anymore, free them | |
527 | */ | |
528 | atomic_sub(atomic_read(&journal->j_reserved_credits), | |
529 | &commit_transaction->t_outstanding_credits); | |
530 | ||
879c5e6b | 531 | trace_jbd2_commit_flushing(journal, commit_transaction); |
bf699327 TT |
532 | stats.run.rs_flushing = jiffies; |
533 | stats.run.rs_locked = jbd2_time_diff(stats.run.rs_locked, | |
534 | stats.run.rs_flushing); | |
8e85fb3f | 535 | |
470decc6 DK |
536 | commit_transaction->t_state = T_FLUSH; |
537 | journal->j_committing_transaction = commit_transaction; | |
538 | journal->j_running_transaction = NULL; | |
e07f7183 | 539 | start_time = ktime_get(); |
470decc6 | 540 | commit_transaction->t_log_start = journal->j_head; |
34fc8768 | 541 | wake_up_all(&journal->j_wait_transaction_locked); |
a931da6a | 542 | write_unlock(&journal->j_state_lock); |
470decc6 | 543 | |
cb3b3bf2 | 544 | jbd2_debug(3, "JBD2: commit phase 2a\n"); |
470decc6 | 545 | |
470decc6 DK |
546 | /* |
547 | * Now start flushing things to disk, in the order they appear | |
548 | * on the transaction lists. Data blocks go first. | |
549 | */ | |
cd1aac32 | 550 | err = journal_submit_data_buffers(journal, commit_transaction); |
470decc6 | 551 | if (err) |
a7fa2baf | 552 | jbd2_journal_abort(journal, err); |
470decc6 | 553 | |
82f04ab4 | 554 | blk_start_plug(&plug); |
9bcf976c | 555 | jbd2_journal_write_revoke_records(commit_transaction, &log_bufs); |
470decc6 | 556 | |
cb3b3bf2 | 557 | jbd2_debug(3, "JBD2: commit phase 2b\n"); |
470decc6 | 558 | |
470decc6 DK |
559 | /* |
560 | * Way to go: we have now written out all of the data for a | |
561 | * transaction! Now comes the tricky part: we need to write out | |
562 | * metadata. Loop over the transaction's entire buffer list: | |
563 | */ | |
a931da6a | 564 | write_lock(&journal->j_state_lock); |
470decc6 | 565 | commit_transaction->t_state = T_COMMIT; |
a931da6a | 566 | write_unlock(&journal->j_state_lock); |
470decc6 | 567 | |
879c5e6b | 568 | trace_jbd2_commit_logging(journal, commit_transaction); |
bf699327 TT |
569 | stats.run.rs_logging = jiffies; |
570 | stats.run.rs_flushing = jbd2_time_diff(stats.run.rs_flushing, | |
571 | stats.run.rs_logging); | |
9f356e5a | 572 | stats.run.rs_blocks = commit_transaction->t_nr_buffers; |
bf699327 | 573 | stats.run.rs_blocks_logged = 0; |
8e85fb3f | 574 | |
1dfc3220 | 575 | J_ASSERT(commit_transaction->t_nr_buffers <= |
a51dca9c | 576 | atomic_read(&commit_transaction->t_outstanding_credits)); |
1dfc3220 | 577 | |
87c89c23 | 578 | err = 0; |
470decc6 | 579 | bufs = 0; |
e5a120ae | 580 | descriptor = NULL; |
470decc6 DK |
581 | while (commit_transaction->t_buffers) { |
582 | ||
583 | /* Find the next buffer to be journaled... */ | |
584 | ||
585 | jh = commit_transaction->t_buffers; | |
586 | ||
587 | /* If we're in abort mode, we just un-journal the buffer and | |
7ad7445f | 588 | release it. */ |
470decc6 DK |
589 | |
590 | if (is_journal_aborted(journal)) { | |
7ad7445f | 591 | clear_buffer_jbddirty(jh2bh(jh)); |
470decc6 | 592 | JBUFFER_TRACE(jh, "journal is aborting: refile"); |
e06c8227 JB |
593 | jbd2_buffer_abort_trigger(jh, |
594 | jh->b_frozen_data ? | |
595 | jh->b_frozen_triggers : | |
596 | jh->b_triggers); | |
f7f4bccb | 597 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
598 | /* If that was the last one, we need to clean up |
599 | * any descriptor buffers which may have been | |
600 | * already allocated, even if we are now | |
601 | * aborting. */ | |
602 | if (!commit_transaction->t_buffers) | |
603 | goto start_journal_io; | |
604 | continue; | |
605 | } | |
606 | ||
607 | /* Make sure we have a descriptor block in which to | |
608 | record the metadata buffer. */ | |
609 | ||
610 | if (!descriptor) { | |
470decc6 DK |
611 | J_ASSERT (bufs == 0); |
612 | ||
cb3b3bf2 | 613 | jbd2_debug(4, "JBD2: get descriptor\n"); |
470decc6 | 614 | |
32ab6715 JK |
615 | descriptor = jbd2_journal_get_descriptor_buffer( |
616 | commit_transaction, | |
617 | JBD2_DESCRIPTOR_BLOCK); | |
470decc6 | 618 | if (!descriptor) { |
a7fa2baf | 619 | jbd2_journal_abort(journal, -EIO); |
470decc6 DK |
620 | continue; |
621 | } | |
622 | ||
cb3b3bf2 | 623 | jbd2_debug(4, "JBD2: got buffer %llu (%p)\n", |
e5a120ae JK |
624 | (unsigned long long)descriptor->b_blocknr, |
625 | descriptor->b_data); | |
e5a120ae JK |
626 | tagp = &descriptor->b_data[sizeof(journal_header_t)]; |
627 | space_left = descriptor->b_size - | |
628 | sizeof(journal_header_t); | |
470decc6 | 629 | first_tag = 1; |
e5a120ae JK |
630 | set_buffer_jwrite(descriptor); |
631 | set_buffer_dirty(descriptor); | |
632 | wbuf[bufs++] = descriptor; | |
470decc6 DK |
633 | |
634 | /* Record it so that we can wait for IO | |
635 | completion later */ | |
e5a120ae JK |
636 | BUFFER_TRACE(descriptor, "ph3: file as descriptor"); |
637 | jbd2_file_log_bh(&log_bufs, descriptor); | |
470decc6 DK |
638 | } |
639 | ||
640 | /* Where is the buffer to be written? */ | |
641 | ||
f7f4bccb | 642 | err = jbd2_journal_next_log_block(journal, &blocknr); |
470decc6 DK |
643 | /* If the block mapping failed, just abandon the buffer |
644 | and repeat this loop: we'll fall into the | |
645 | refile-on-abort condition above. */ | |
646 | if (err) { | |
a7fa2baf | 647 | jbd2_journal_abort(journal, err); |
470decc6 DK |
648 | continue; |
649 | } | |
650 | ||
651 | /* | |
652 | * start_this_handle() uses t_outstanding_credits to determine | |
0db45889 | 653 | * the free space in the log. |
470decc6 | 654 | */ |
a51dca9c | 655 | atomic_dec(&commit_transaction->t_outstanding_credits); |
470decc6 DK |
656 | |
657 | /* Bump b_count to prevent truncate from stumbling over | |
658 | the shadowed buffer! @@@ This can go if we ever get | |
f5113eff | 659 | rid of the shadow pairing of buffers. */ |
470decc6 DK |
660 | atomic_inc(&jh2bh(jh)->b_count); |
661 | ||
470decc6 | 662 | /* |
f5113eff JK |
663 | * Make a temporary IO buffer with which to write it out |
664 | * (this will requeue the metadata buffer to BJ_Shadow). | |
470decc6 | 665 | */ |
f5113eff | 666 | set_bit(BH_JWrite, &jh2bh(jh)->b_state); |
470decc6 | 667 | JBUFFER_TRACE(jh, "ph3: write metadata"); |
f7f4bccb | 668 | flags = jbd2_journal_write_metadata_buffer(commit_transaction, |
f5113eff | 669 | jh, &wbuf[bufs], blocknr); |
e6ec116b TT |
670 | if (flags < 0) { |
671 | jbd2_journal_abort(journal, flags); | |
672 | continue; | |
673 | } | |
f5113eff | 674 | jbd2_file_log_bh(&io_bufs, wbuf[bufs]); |
470decc6 DK |
675 | |
676 | /* Record the new block's tag in the current descriptor | |
677 | buffer */ | |
678 | ||
679 | tag_flag = 0; | |
680 | if (flags & 1) | |
f7f4bccb | 681 | tag_flag |= JBD2_FLAG_ESCAPE; |
470decc6 | 682 | if (!first_tag) |
f7f4bccb | 683 | tag_flag |= JBD2_FLAG_SAME_UUID; |
470decc6 DK |
684 | |
685 | tag = (journal_block_tag_t *) tagp; | |
db9ee220 | 686 | write_tag_block(journal, tag, jh2bh(jh)->b_blocknr); |
8f888ef8 | 687 | tag->t_flags = cpu_to_be16(tag_flag); |
f5113eff | 688 | jbd2_block_tag_csum_set(journal, tag, wbuf[bufs], |
c3900875 | 689 | commit_transaction->t_tid); |
b517bea1 ZB |
690 | tagp += tag_bytes; |
691 | space_left -= tag_bytes; | |
f5113eff | 692 | bufs++; |
470decc6 DK |
693 | |
694 | if (first_tag) { | |
695 | memcpy (tagp, journal->j_uuid, 16); | |
696 | tagp += 16; | |
697 | space_left -= 16; | |
698 | first_tag = 0; | |
699 | } | |
700 | ||
701 | /* If there's no more to do, or if the descriptor is full, | |
702 | let the IO rip! */ | |
703 | ||
704 | if (bufs == journal->j_wbufsize || | |
705 | commit_transaction->t_buffers == NULL || | |
3caa487f | 706 | space_left < tag_bytes + 16 + csum_size) { |
470decc6 | 707 | |
cb3b3bf2 | 708 | jbd2_debug(4, "JBD2: Submit %d IOs\n", bufs); |
470decc6 DK |
709 | |
710 | /* Write an end-of-descriptor marker before | |
711 | submitting the IOs. "tag" still points to | |
712 | the last tag we set up. */ | |
713 | ||
8f888ef8 | 714 | tag->t_flags |= cpu_to_be16(JBD2_FLAG_LAST_TAG); |
470decc6 | 715 | start_journal_io: |
6e876c3d | 716 | if (descriptor) |
717 | jbd2_descriptor_block_csum_set(journal, | |
718 | descriptor); | |
719 | ||
470decc6 DK |
720 | for (i = 0; i < bufs; i++) { |
721 | struct buffer_head *bh = wbuf[i]; | |
818d276c GS |
722 | /* |
723 | * Compute checksum. | |
724 | */ | |
56316a0d | 725 | if (jbd2_has_feature_checksum(journal)) { |
818d276c GS |
726 | crc32_sum = |
727 | jbd2_checksum_data(crc32_sum, bh); | |
728 | } | |
729 | ||
470decc6 DK |
730 | lock_buffer(bh); |
731 | clear_buffer_dirty(bh); | |
732 | set_buffer_uptodate(bh); | |
733 | bh->b_end_io = journal_end_buffer_io_sync; | |
1420c4a5 | 734 | submit_bh(REQ_OP_WRITE | REQ_SYNC, bh); |
470decc6 DK |
735 | } |
736 | cond_resched(); | |
737 | ||
738 | /* Force a new descriptor to be generated next | |
739 | time round the loop. */ | |
740 | descriptor = NULL; | |
741 | bufs = 0; | |
742 | } | |
743 | } | |
744 | ||
f73bee49 JK |
745 | err = journal_finish_inode_data_buffers(journal, commit_transaction); |
746 | if (err) { | |
747 | printk(KERN_WARNING | |
748 | "JBD2: Detected IO errors while flushing file data " | |
749 | "on %s\n", journal->j_devname); | |
750 | if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR) | |
751 | jbd2_journal_abort(journal, err); | |
752 | err = 0; | |
753 | } | |
754 | ||
3339578f JK |
755 | /* |
756 | * Get current oldest transaction in the log before we issue flush | |
757 | * to the filesystem device. After the flush we can be sure that | |
758 | * blocks of all older transactions are checkpointed to persistent | |
759 | * storage and we will be safe to update journal start in the | |
760 | * superblock with the numbers we get here. | |
761 | */ | |
762 | update_tail = | |
763 | jbd2_journal_get_log_tail(journal, &first_tid, &first_block); | |
764 | ||
bbd2be36 | 765 | write_lock(&journal->j_state_lock); |
3339578f JK |
766 | if (update_tail) { |
767 | long freed = first_block - journal->j_tail; | |
768 | ||
769 | if (first_block < journal->j_tail) | |
770 | freed += journal->j_last - journal->j_first; | |
771 | /* Update tail only if we free significant amount of space */ | |
ede7dc7f | 772 | if (freed < jbd2_journal_get_max_txn_bufs(journal)) |
3339578f JK |
773 | update_tail = 0; |
774 | } | |
bbd2be36 JK |
775 | J_ASSERT(commit_transaction->t_state == T_COMMIT); |
776 | commit_transaction->t_state = T_COMMIT_DFLUSH; | |
777 | write_unlock(&journal->j_state_lock); | |
3339578f | 778 | |
4f981868 | 779 | /* |
cc3e1bea TT |
780 | * If the journal is not located on the file system device, |
781 | * then we must flush the file system device before we issue | |
782 | * the commit record | |
783 | */ | |
81be12c8 | 784 | if (commit_transaction->t_need_data_flush && |
cc3e1bea TT |
785 | (journal->j_fs_dev != journal->j_dev) && |
786 | (journal->j_flags & JBD2_BARRIER)) | |
c6bf3f0e | 787 | blkdev_issue_flush(journal->j_fs_dev); |
818d276c | 788 | |
cc3e1bea | 789 | /* Done it all: now write the commit record asynchronously. */ |
56316a0d | 790 | if (jbd2_has_feature_async_commit(journal)) { |
818d276c GS |
791 | err = journal_submit_commit_record(journal, commit_transaction, |
792 | &cbh, crc32_sum); | |
793 | if (err) | |
d0a186e0 | 794 | jbd2_journal_abort(journal, err); |
e9e34f4e | 795 | } |
c851ed54 | 796 | |
82f04ab4 JA |
797 | blk_finish_plug(&plug); |
798 | ||
470decc6 DK |
799 | /* Lo and behold: we have just managed to send a transaction to |
800 | the log. Before we can commit it, wait for the IO so far to | |
801 | complete. Control buffers being written are on the | |
802 | transaction's t_log_list queue, and metadata buffers are on | |
f5113eff | 803 | the io_bufs list. |
470decc6 DK |
804 | |
805 | Wait for the buffers in reverse order. That way we are | |
806 | less likely to be woken up until all IOs have completed, and | |
807 | so we incur less scheduling load. | |
808 | */ | |
809 | ||
cb3b3bf2 | 810 | jbd2_debug(3, "JBD2: commit phase 3\n"); |
470decc6 | 811 | |
f5113eff JK |
812 | while (!list_empty(&io_bufs)) { |
813 | struct buffer_head *bh = list_entry(io_bufs.prev, | |
814 | struct buffer_head, | |
815 | b_assoc_buffers); | |
470decc6 | 816 | |
f5113eff JK |
817 | wait_on_buffer(bh); |
818 | cond_resched(); | |
470decc6 DK |
819 | |
820 | if (unlikely(!buffer_uptodate(bh))) | |
821 | err = -EIO; | |
f5113eff | 822 | jbd2_unfile_log_bh(bh); |
015c6033 | 823 | stats.run.rs_blocks_logged++; |
470decc6 DK |
824 | |
825 | /* | |
f5113eff JK |
826 | * The list contains temporary buffer heads created by |
827 | * jbd2_journal_write_metadata_buffer(). | |
470decc6 DK |
828 | */ |
829 | BUFFER_TRACE(bh, "dumping temporary bh"); | |
470decc6 DK |
830 | __brelse(bh); |
831 | J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0); | |
832 | free_buffer_head(bh); | |
833 | ||
f5113eff | 834 | /* We also have to refile the corresponding shadowed buffer */ |
470decc6 DK |
835 | jh = commit_transaction->t_shadow_list->b_tprev; |
836 | bh = jh2bh(jh); | |
f5113eff | 837 | clear_buffer_jwrite(bh); |
470decc6 | 838 | J_ASSERT_BH(bh, buffer_jbddirty(bh)); |
b34090e5 | 839 | J_ASSERT_BH(bh, !buffer_shadow(bh)); |
470decc6 DK |
840 | |
841 | /* The metadata is now released for reuse, but we need | |
842 | to remember it against this transaction so that when | |
843 | we finally commit, we can do any checkpointing | |
844 | required. */ | |
845 | JBUFFER_TRACE(jh, "file as BJ_Forget"); | |
f7f4bccb | 846 | jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget); |
470decc6 DK |
847 | JBUFFER_TRACE(jh, "brelse shadowed buffer"); |
848 | __brelse(bh); | |
849 | } | |
850 | ||
851 | J_ASSERT (commit_transaction->t_shadow_list == NULL); | |
852 | ||
cb3b3bf2 | 853 | jbd2_debug(3, "JBD2: commit phase 4\n"); |
470decc6 DK |
854 | |
855 | /* Here we wait for the revoke record and descriptor record buffers */ | |
e5a120ae | 856 | while (!list_empty(&log_bufs)) { |
470decc6 DK |
857 | struct buffer_head *bh; |
858 | ||
e5a120ae JK |
859 | bh = list_entry(log_bufs.prev, struct buffer_head, b_assoc_buffers); |
860 | wait_on_buffer(bh); | |
861 | cond_resched(); | |
470decc6 DK |
862 | |
863 | if (unlikely(!buffer_uptodate(bh))) | |
864 | err = -EIO; | |
865 | ||
866 | BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile"); | |
867 | clear_buffer_jwrite(bh); | |
e5a120ae | 868 | jbd2_unfile_log_bh(bh); |
015c6033 | 869 | stats.run.rs_blocks_logged++; |
470decc6 DK |
870 | __brelse(bh); /* One for getblk */ |
871 | /* AKPM: bforget here */ | |
872 | } | |
873 | ||
77e841de HK |
874 | if (err) |
875 | jbd2_journal_abort(journal, err); | |
876 | ||
cb3b3bf2 | 877 | jbd2_debug(3, "JBD2: commit phase 5\n"); |
bbd2be36 JK |
878 | write_lock(&journal->j_state_lock); |
879 | J_ASSERT(commit_transaction->t_state == T_COMMIT_DFLUSH); | |
880 | commit_transaction->t_state = T_COMMIT_JFLUSH; | |
881 | write_unlock(&journal->j_state_lock); | |
470decc6 | 882 | |
56316a0d | 883 | if (!jbd2_has_feature_async_commit(journal)) { |
818d276c GS |
884 | err = journal_submit_commit_record(journal, commit_transaction, |
885 | &cbh, crc32_sum); | |
886 | if (err) | |
d0a186e0 | 887 | jbd2_journal_abort(journal, err); |
818d276c | 888 | } |
6cba611e | 889 | if (cbh) |
fd98496f | 890 | err = journal_wait_on_commit_record(journal, cbh); |
015c6033 | 891 | stats.run.rs_blocks_logged++; |
56316a0d | 892 | if (jbd2_has_feature_async_commit(journal) && |
f73bee49 | 893 | journal->j_flags & JBD2_BARRIER) { |
c6bf3f0e | 894 | blkdev_issue_flush(journal->j_dev); |
f73bee49 | 895 | } |
470decc6 DK |
896 | |
897 | if (err) | |
a7fa2baf | 898 | jbd2_journal_abort(journal, err); |
470decc6 | 899 | |
9f356e5a JK |
900 | WARN_ON_ONCE( |
901 | atomic_read(&commit_transaction->t_outstanding_credits) < 0); | |
902 | ||
3339578f JK |
903 | /* |
904 | * Now disk caches for filesystem device are flushed so we are safe to | |
905 | * erase checkpointed transactions from the log by updating journal | |
906 | * superblock. | |
907 | */ | |
908 | if (update_tail) | |
909 | jbd2_update_log_tail(journal, first_tid, first_block); | |
910 | ||
470decc6 DK |
911 | /* End of a transaction! Finally, we can do checkpoint |
912 | processing: any buffers committed as a result of this | |
913 | transaction can be removed from any checkpoint list it was on | |
914 | before. */ | |
915 | ||
cb3b3bf2 | 916 | jbd2_debug(3, "JBD2: commit phase 6\n"); |
470decc6 | 917 | |
c851ed54 | 918 | J_ASSERT(list_empty(&commit_transaction->t_inode_list)); |
470decc6 DK |
919 | J_ASSERT(commit_transaction->t_buffers == NULL); |
920 | J_ASSERT(commit_transaction->t_checkpoint_list == NULL); | |
470decc6 | 921 | J_ASSERT(commit_transaction->t_shadow_list == NULL); |
470decc6 DK |
922 | |
923 | restart_loop: | |
924 | /* | |
925 | * As there are other places (journal_unmap_buffer()) adding buffers | |
926 | * to this list we have to be careful and hold the j_list_lock. | |
927 | */ | |
928 | spin_lock(&journal->j_list_lock); | |
929 | while (commit_transaction->t_forget) { | |
930 | transaction_t *cp_transaction; | |
931 | struct buffer_head *bh; | |
de1b7941 | 932 | int try_to_free = 0; |
93108ebb | 933 | bool drop_ref; |
470decc6 DK |
934 | |
935 | jh = commit_transaction->t_forget; | |
936 | spin_unlock(&journal->j_list_lock); | |
937 | bh = jh2bh(jh); | |
de1b7941 JK |
938 | /* |
939 | * Get a reference so that bh cannot be freed before we are | |
940 | * done with it. | |
941 | */ | |
942 | get_bh(bh); | |
46417064 | 943 | spin_lock(&jh->b_state_lock); |
23e2af35 | 944 | J_ASSERT_JH(jh, jh->b_transaction == commit_transaction); |
470decc6 DK |
945 | |
946 | /* | |
947 | * If there is undo-protected committed data against | |
948 | * this buffer, then we can remove it now. If it is a | |
949 | * buffer needing such protection, the old frozen_data | |
950 | * field now points to a committed version of the | |
951 | * buffer, so rotate that field to the new committed | |
952 | * data. | |
953 | * | |
954 | * Otherwise, we can just throw away the frozen data now. | |
e06c8227 JB |
955 | * |
956 | * We also know that the frozen data has already fired | |
957 | * its triggers if they exist, so we can clear that too. | |
470decc6 DK |
958 | */ |
959 | if (jh->b_committed_data) { | |
af1e76d6 | 960 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
961 | jh->b_committed_data = NULL; |
962 | if (jh->b_frozen_data) { | |
963 | jh->b_committed_data = jh->b_frozen_data; | |
964 | jh->b_frozen_data = NULL; | |
e06c8227 | 965 | jh->b_frozen_triggers = NULL; |
470decc6 DK |
966 | } |
967 | } else if (jh->b_frozen_data) { | |
af1e76d6 | 968 | jbd2_free(jh->b_frozen_data, bh->b_size); |
470decc6 | 969 | jh->b_frozen_data = NULL; |
e06c8227 | 970 | jh->b_frozen_triggers = NULL; |
470decc6 DK |
971 | } |
972 | ||
973 | spin_lock(&journal->j_list_lock); | |
974 | cp_transaction = jh->b_cp_transaction; | |
975 | if (cp_transaction) { | |
976 | JBUFFER_TRACE(jh, "remove from old cp transaction"); | |
8e85fb3f | 977 | cp_transaction->t_chp_stats.cs_dropped++; |
f7f4bccb | 978 | __jbd2_journal_remove_checkpoint(jh); |
470decc6 DK |
979 | } |
980 | ||
981 | /* Only re-checkpoint the buffer_head if it is marked | |
982 | * dirty. If the buffer was added to the BJ_Forget list | |
f7f4bccb | 983 | * by jbd2_journal_forget, it may no longer be dirty and |
470decc6 DK |
984 | * there's no point in keeping a checkpoint record for |
985 | * it. */ | |
986 | ||
b794e7a6 | 987 | /* |
6a66a7de | 988 | * A buffer which has been freed while still being journaled |
989 | * by a previous transaction, refile the buffer to BJ_Forget of | |
990 | * the running transaction. If the just committed transaction | |
991 | * contains "add to orphan" operation, we can completely | |
992 | * invalidate the buffer now. We are rather through in that | |
993 | * since the buffer may be still accessible when blocksize < | |
994 | * pagesize and it is attached to the last partial page. | |
995 | */ | |
996 | if (buffer_freed(bh) && !jh->b_next_transaction) { | |
c96dceea | 997 | struct address_space *mapping; |
998 | ||
6a66a7de | 999 | clear_buffer_freed(bh); |
1000 | clear_buffer_jbddirty(bh); | |
c96dceea | 1001 | |
1002 | /* | |
1003 | * Block device buffers need to stay mapped all the | |
1004 | * time, so it is enough to clear buffer_jbddirty and | |
1005 | * buffer_freed bits. For the file mapping buffers (i.e. | |
1006 | * journalled data) we need to unmap buffer and clear | |
1007 | * more bits. We also need to be careful about the check | |
1008 | * because the data page mapping can get cleared under | |
780f66e5 | 1009 | * our hands. Note that if mapping == NULL, we don't |
1010 | * need to make buffer unmapped because the page is | |
1011 | * already detached from the mapping and buffers cannot | |
1012 | * get reused. | |
c96dceea | 1013 | */ |
0d22fe2f | 1014 | mapping = READ_ONCE(bh->b_folio->mapping); |
c96dceea | 1015 | if (mapping && !sb_is_blkdev_sb(mapping->host->i_sb)) { |
1016 | clear_buffer_mapped(bh); | |
1017 | clear_buffer_new(bh); | |
1018 | clear_buffer_req(bh); | |
1019 | bh->b_bdev = NULL; | |
1020 | } | |
470decc6 DK |
1021 | } |
1022 | ||
1023 | if (buffer_jbddirty(bh)) { | |
1024 | JBUFFER_TRACE(jh, "add to new checkpointing trans"); | |
f7f4bccb | 1025 | __jbd2_journal_insert_checkpoint(jh, commit_transaction); |
7ad7445f HK |
1026 | if (is_journal_aborted(journal)) |
1027 | clear_buffer_jbddirty(bh); | |
470decc6 DK |
1028 | } else { |
1029 | J_ASSERT_BH(bh, !buffer_dirty(bh)); | |
de1b7941 JK |
1030 | /* |
1031 | * The buffer on BJ_Forget list and not jbddirty means | |
470decc6 DK |
1032 | * it has been freed by this transaction and hence it |
1033 | * could not have been reallocated until this | |
1034 | * transaction has committed. *BUT* it could be | |
1035 | * reallocated once we have written all the data to | |
1036 | * disk and before we process the buffer on BJ_Forget | |
de1b7941 JK |
1037 | * list. |
1038 | */ | |
1039 | if (!jh->b_next_transaction) | |
1040 | try_to_free = 1; | |
470decc6 | 1041 | } |
de1b7941 | 1042 | JBUFFER_TRACE(jh, "refile or unfile buffer"); |
93108ebb | 1043 | drop_ref = __jbd2_journal_refile_buffer(jh); |
46417064 | 1044 | spin_unlock(&jh->b_state_lock); |
93108ebb JK |
1045 | if (drop_ref) |
1046 | jbd2_journal_put_journal_head(jh); | |
de1b7941 JK |
1047 | if (try_to_free) |
1048 | release_buffer_page(bh); /* Drops bh reference */ | |
1049 | else | |
1050 | __brelse(bh); | |
470decc6 DK |
1051 | cond_resched_lock(&journal->j_list_lock); |
1052 | } | |
1053 | spin_unlock(&journal->j_list_lock); | |
1054 | /* | |
f5a7a6b0 JK |
1055 | * This is a bit sleazy. We use j_list_lock to protect transition |
1056 | * of a transaction into T_FINISHED state and calling | |
1057 | * __jbd2_journal_drop_transaction(). Otherwise we could race with | |
1058 | * other checkpointing code processing the transaction... | |
470decc6 | 1059 | */ |
a931da6a | 1060 | write_lock(&journal->j_state_lock); |
470decc6 DK |
1061 | spin_lock(&journal->j_list_lock); |
1062 | /* | |
1063 | * Now recheck if some buffers did not get attached to the transaction | |
1064 | * while the lock was dropped... | |
1065 | */ | |
1066 | if (commit_transaction->t_forget) { | |
1067 | spin_unlock(&journal->j_list_lock); | |
a931da6a | 1068 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
1069 | goto restart_loop; |
1070 | } | |
1071 | ||
d4e839d4 TT |
1072 | /* Add the transaction to the checkpoint list |
1073 | * __journal_remove_checkpoint() can not destroy transaction | |
1074 | * under us because it is not marked as T_FINISHED yet */ | |
1075 | if (journal->j_checkpoint_transactions == NULL) { | |
1076 | journal->j_checkpoint_transactions = commit_transaction; | |
1077 | commit_transaction->t_cpnext = commit_transaction; | |
1078 | commit_transaction->t_cpprev = commit_transaction; | |
1079 | } else { | |
1080 | commit_transaction->t_cpnext = | |
1081 | journal->j_checkpoint_transactions; | |
1082 | commit_transaction->t_cpprev = | |
1083 | commit_transaction->t_cpnext->t_cpprev; | |
1084 | commit_transaction->t_cpnext->t_cpprev = | |
1085 | commit_transaction; | |
1086 | commit_transaction->t_cpprev->t_cpnext = | |
1087 | commit_transaction; | |
1088 | } | |
1089 | spin_unlock(&journal->j_list_lock); | |
1090 | ||
470decc6 DK |
1091 | /* Done with this transaction! */ |
1092 | ||
cb3b3bf2 | 1093 | jbd2_debug(3, "JBD2: commit phase 7\n"); |
470decc6 | 1094 | |
bbd2be36 | 1095 | J_ASSERT(commit_transaction->t_state == T_COMMIT_JFLUSH); |
470decc6 | 1096 | |
8e85fb3f | 1097 | commit_transaction->t_start = jiffies; |
bf699327 TT |
1098 | stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging, |
1099 | commit_transaction->t_start); | |
8e85fb3f JL |
1100 | |
1101 | /* | |
bf699327 | 1102 | * File the transaction statistics |
8e85fb3f | 1103 | */ |
8e85fb3f | 1104 | stats.ts_tid = commit_transaction->t_tid; |
8dd42046 TT |
1105 | stats.run.rs_handle_count = |
1106 | atomic_read(&commit_transaction->t_handle_count); | |
bf699327 TT |
1107 | trace_jbd2_run_stats(journal->j_fs_dev->bd_dev, |
1108 | commit_transaction->t_tid, &stats.run); | |
42cf3452 | 1109 | stats.ts_requested = (commit_transaction->t_requested) ? 1 : 0; |
8e85fb3f | 1110 | |
794446c6 | 1111 | commit_transaction->t_state = T_COMMIT_CALLBACK; |
470decc6 DK |
1112 | J_ASSERT(commit_transaction == journal->j_committing_transaction); |
1113 | journal->j_commit_sequence = commit_transaction->t_tid; | |
1114 | journal->j_committing_transaction = NULL; | |
e07f7183 | 1115 | commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time)); |
470decc6 | 1116 | |
e07f7183 JB |
1117 | /* |
1118 | * weight the commit time higher than the average time so we don't | |
1119 | * react too strongly to vast changes in the commit time | |
1120 | */ | |
1121 | if (likely(journal->j_average_commit_time)) | |
1122 | journal->j_average_commit_time = (commit_time + | |
1123 | journal->j_average_commit_time*3) / 4; | |
1124 | else | |
1125 | journal->j_average_commit_time = commit_time; | |
794446c6 | 1126 | |
a931da6a | 1127 | write_unlock(&journal->j_state_lock); |
6c20ec85 | 1128 | |
fb68407b AK |
1129 | if (journal->j_commit_callback) |
1130 | journal->j_commit_callback(journal, commit_transaction); | |
ff780b91 | 1131 | if (journal->j_fc_cleanup_callback) |
e85c81ba | 1132 | journal->j_fc_cleanup_callback(journal, 1, commit_transaction->t_tid); |
fb68407b | 1133 | |
879c5e6b | 1134 | trace_jbd2_end_commit(journal, commit_transaction); |
cb3b3bf2 | 1135 | jbd2_debug(1, "JBD2: commit %d complete, head %d\n", |
470decc6 DK |
1136 | journal->j_commit_sequence, journal->j_tail_sequence); |
1137 | ||
794446c6 | 1138 | write_lock(&journal->j_state_lock); |
ff780b91 HS |
1139 | journal->j_flags &= ~JBD2_FULL_COMMIT_ONGOING; |
1140 | journal->j_flags &= ~JBD2_FAST_COMMIT_ONGOING; | |
794446c6 DM |
1141 | spin_lock(&journal->j_list_lock); |
1142 | commit_transaction->t_state = T_FINISHED; | |
d4e839d4 | 1143 | /* Check if the transaction can be dropped now that we are finished */ |
794446c6 DM |
1144 | if (commit_transaction->t_checkpoint_list == NULL && |
1145 | commit_transaction->t_checkpoint_io_list == NULL) { | |
1146 | __jbd2_journal_drop_transaction(journal, commit_transaction); | |
1147 | jbd2_journal_free_transaction(commit_transaction); | |
1148 | } | |
1149 | spin_unlock(&journal->j_list_lock); | |
1150 | write_unlock(&journal->j_state_lock); | |
470decc6 | 1151 | wake_up(&journal->j_wait_done_commit); |
ff780b91 | 1152 | wake_up(&journal->j_fc_wait); |
42cf3452 TT |
1153 | |
1154 | /* | |
1155 | * Calculate overall stats | |
1156 | */ | |
1157 | spin_lock(&journal->j_history_lock); | |
1158 | journal->j_stats.ts_tid++; | |
1159 | journal->j_stats.ts_requested += stats.ts_requested; | |
1160 | journal->j_stats.run.rs_wait += stats.run.rs_wait; | |
1161 | journal->j_stats.run.rs_request_delay += stats.run.rs_request_delay; | |
1162 | journal->j_stats.run.rs_running += stats.run.rs_running; | |
1163 | journal->j_stats.run.rs_locked += stats.run.rs_locked; | |
1164 | journal->j_stats.run.rs_flushing += stats.run.rs_flushing; | |
1165 | journal->j_stats.run.rs_logging += stats.run.rs_logging; | |
1166 | journal->j_stats.run.rs_handle_count += stats.run.rs_handle_count; | |
1167 | journal->j_stats.run.rs_blocks += stats.run.rs_blocks; | |
1168 | journal->j_stats.run.rs_blocks_logged += stats.run.rs_blocks_logged; | |
1169 | spin_unlock(&journal->j_history_lock); | |
470decc6 | 1170 | } |