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Commit | Line | Data |
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470decc6 | 1 | /* |
f7f4bccb | 2 | * linux/fs/jbd2/commit.c |
470decc6 DK |
3 | * |
4 | * Written by Stephen C. Tweedie <sct@redhat.com>, 1998 | |
5 | * | |
6 | * Copyright 1998 Red Hat corp --- All Rights Reserved | |
7 | * | |
8 | * This file is part of the Linux kernel and is made available under | |
9 | * the terms of the GNU General Public License, version 2, or at your | |
10 | * option, any later version, incorporated herein by reference. | |
11 | * | |
12 | * Journal commit routines for the generic filesystem journaling code; | |
13 | * part of the ext2fs journaling system. | |
14 | */ | |
15 | ||
16 | #include <linux/time.h> | |
17 | #include <linux/fs.h> | |
f7f4bccb | 18 | #include <linux/jbd2.h> |
470decc6 DK |
19 | #include <linux/errno.h> |
20 | #include <linux/slab.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/pagemap.h> | |
8e85fb3f | 23 | #include <linux/jiffies.h> |
818d276c | 24 | #include <linux/crc32.h> |
cd1aac32 AK |
25 | #include <linux/writeback.h> |
26 | #include <linux/backing-dev.h> | |
fd98496f | 27 | #include <linux/bio.h> |
0e3d2a63 | 28 | #include <linux/blkdev.h> |
39e3ac25 | 29 | #include <linux/bitops.h> |
879c5e6b | 30 | #include <trace/events/jbd2.h> |
470decc6 DK |
31 | |
32 | /* | |
b34090e5 | 33 | * IO end handler for temporary buffer_heads handling writes to the journal. |
470decc6 DK |
34 | */ |
35 | static void journal_end_buffer_io_sync(struct buffer_head *bh, int uptodate) | |
36 | { | |
b34090e5 JK |
37 | struct buffer_head *orig_bh = bh->b_private; |
38 | ||
470decc6 DK |
39 | BUFFER_TRACE(bh, ""); |
40 | if (uptodate) | |
41 | set_buffer_uptodate(bh); | |
42 | else | |
43 | clear_buffer_uptodate(bh); | |
b34090e5 JK |
44 | if (orig_bh) { |
45 | clear_bit_unlock(BH_Shadow, &orig_bh->b_state); | |
4e857c58 | 46 | smp_mb__after_atomic(); |
b34090e5 JK |
47 | wake_up_bit(&orig_bh->b_state, BH_Shadow); |
48 | } | |
470decc6 DK |
49 | unlock_buffer(bh); |
50 | } | |
51 | ||
52 | /* | |
87c89c23 JK |
53 | * When an ext4 file is truncated, it is possible that some pages are not |
54 | * successfully freed, because they are attached to a committing transaction. | |
470decc6 DK |
55 | * After the transaction commits, these pages are left on the LRU, with no |
56 | * ->mapping, and with attached buffers. These pages are trivially reclaimable | |
57 | * by the VM, but their apparent absence upsets the VM accounting, and it makes | |
58 | * the numbers in /proc/meminfo look odd. | |
59 | * | |
60 | * So here, we have a buffer which has just come off the forget list. Look to | |
61 | * see if we can strip all buffers from the backing page. | |
62 | * | |
63 | * Called under lock_journal(), and possibly under journal_datalist_lock. The | |
64 | * caller provided us with a ref against the buffer, and we drop that here. | |
65 | */ | |
66 | static void release_buffer_page(struct buffer_head *bh) | |
67 | { | |
68 | struct page *page; | |
69 | ||
70 | if (buffer_dirty(bh)) | |
71 | goto nope; | |
72 | if (atomic_read(&bh->b_count) != 1) | |
73 | goto nope; | |
74 | page = bh->b_page; | |
75 | if (!page) | |
76 | goto nope; | |
77 | if (page->mapping) | |
78 | goto nope; | |
79 | ||
80 | /* OK, it's a truncated page */ | |
529ae9aa | 81 | if (!trylock_page(page)) |
470decc6 DK |
82 | goto nope; |
83 | ||
84 | page_cache_get(page); | |
85 | __brelse(bh); | |
86 | try_to_free_buffers(page); | |
87 | unlock_page(page); | |
88 | page_cache_release(page); | |
89 | return; | |
90 | ||
91 | nope: | |
92 | __brelse(bh); | |
93 | } | |
94 | ||
e5a120ae | 95 | static void jbd2_commit_block_csum_set(journal_t *j, struct buffer_head *bh) |
1f56c589 DW |
96 | { |
97 | struct commit_header *h; | |
98 | __u32 csum; | |
99 | ||
db9ee220 | 100 | if (!jbd2_journal_has_csum_v2or3(j)) |
1f56c589 DW |
101 | return; |
102 | ||
e5a120ae | 103 | h = (struct commit_header *)(bh->b_data); |
1f56c589 DW |
104 | h->h_chksum_type = 0; |
105 | h->h_chksum_size = 0; | |
106 | h->h_chksum[0] = 0; | |
e5a120ae | 107 | csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize); |
1f56c589 DW |
108 | h->h_chksum[0] = cpu_to_be32(csum); |
109 | } | |
110 | ||
818d276c GS |
111 | /* |
112 | * Done it all: now submit the commit record. We should have | |
470decc6 DK |
113 | * cleaned up our previous buffers by now, so if we are in abort |
114 | * mode we can now just skip the rest of the journal write | |
115 | * entirely. | |
116 | * | |
117 | * Returns 1 if the journal needs to be aborted or 0 on success | |
118 | */ | |
818d276c GS |
119 | static int journal_submit_commit_record(journal_t *journal, |
120 | transaction_t *commit_transaction, | |
121 | struct buffer_head **cbh, | |
122 | __u32 crc32_sum) | |
470decc6 | 123 | { |
818d276c | 124 | struct commit_header *tmp; |
470decc6 | 125 | struct buffer_head *bh; |
818d276c | 126 | int ret; |
736603ab | 127 | struct timespec now = current_kernel_time(); |
470decc6 | 128 | |
6cba611e ZH |
129 | *cbh = NULL; |
130 | ||
470decc6 DK |
131 | if (is_journal_aborted(journal)) |
132 | return 0; | |
133 | ||
e5a120ae JK |
134 | bh = jbd2_journal_get_descriptor_buffer(journal); |
135 | if (!bh) | |
470decc6 DK |
136 | return 1; |
137 | ||
818d276c GS |
138 | tmp = (struct commit_header *)bh->b_data; |
139 | tmp->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); | |
140 | tmp->h_blocktype = cpu_to_be32(JBD2_COMMIT_BLOCK); | |
141 | tmp->h_sequence = cpu_to_be32(commit_transaction->t_tid); | |
736603ab TT |
142 | tmp->h_commit_sec = cpu_to_be64(now.tv_sec); |
143 | tmp->h_commit_nsec = cpu_to_be32(now.tv_nsec); | |
818d276c | 144 | |
56316a0d | 145 | if (jbd2_has_feature_checksum(journal)) { |
818d276c GS |
146 | tmp->h_chksum_type = JBD2_CRC32_CHKSUM; |
147 | tmp->h_chksum_size = JBD2_CRC32_CHKSUM_SIZE; | |
148 | tmp->h_chksum[0] = cpu_to_be32(crc32_sum); | |
470decc6 | 149 | } |
e5a120ae | 150 | jbd2_commit_block_csum_set(journal, bh); |
470decc6 | 151 | |
e5a120ae | 152 | BUFFER_TRACE(bh, "submit commit block"); |
818d276c | 153 | lock_buffer(bh); |
45a90bfd | 154 | clear_buffer_dirty(bh); |
818d276c GS |
155 | set_buffer_uptodate(bh); |
156 | bh->b_end_io = journal_end_buffer_io_sync; | |
157 | ||
158 | if (journal->j_flags & JBD2_BARRIER && | |
56316a0d | 159 | !jbd2_has_feature_async_commit(journal)) |
721a9602 | 160 | ret = submit_bh(WRITE_SYNC | WRITE_FLUSH_FUA, bh); |
9c35575b | 161 | else |
721a9602 | 162 | ret = submit_bh(WRITE_SYNC, bh); |
9c35575b | 163 | |
818d276c GS |
164 | *cbh = bh; |
165 | return ret; | |
166 | } | |
167 | ||
168 | /* | |
169 | * This function along with journal_submit_commit_record | |
170 | * allows to write the commit record asynchronously. | |
171 | */ | |
fd98496f TT |
172 | static int journal_wait_on_commit_record(journal_t *journal, |
173 | struct buffer_head *bh) | |
818d276c GS |
174 | { |
175 | int ret = 0; | |
176 | ||
177 | clear_buffer_dirty(bh); | |
178 | wait_on_buffer(bh); | |
470decc6 | 179 | |
818d276c GS |
180 | if (unlikely(!buffer_uptodate(bh))) |
181 | ret = -EIO; | |
182 | put_bh(bh); /* One for getblk() */ | |
818d276c GS |
183 | |
184 | return ret; | |
470decc6 DK |
185 | } |
186 | ||
cd1aac32 AK |
187 | /* |
188 | * write the filemap data using writepage() address_space_operations. | |
189 | * We don't do block allocation here even for delalloc. We don't | |
190 | * use writepages() because with dealyed allocation we may be doing | |
191 | * block allocation in writepages(). | |
192 | */ | |
193 | static int journal_submit_inode_data_buffers(struct address_space *mapping) | |
194 | { | |
195 | int ret; | |
196 | struct writeback_control wbc = { | |
197 | .sync_mode = WB_SYNC_ALL, | |
198 | .nr_to_write = mapping->nrpages * 2, | |
199 | .range_start = 0, | |
200 | .range_end = i_size_read(mapping->host), | |
cd1aac32 AK |
201 | }; |
202 | ||
203 | ret = generic_writepages(mapping, &wbc); | |
204 | return ret; | |
205 | } | |
206 | ||
c851ed54 JK |
207 | /* |
208 | * Submit all the data buffers of inode associated with the transaction to | |
209 | * disk. | |
210 | * | |
211 | * We are in a committing transaction. Therefore no new inode can be added to | |
212 | * our inode list. We use JI_COMMIT_RUNNING flag to protect inode we currently | |
213 | * operate on from being released while we write out pages. | |
214 | */ | |
cd1aac32 | 215 | static int journal_submit_data_buffers(journal_t *journal, |
c851ed54 JK |
216 | transaction_t *commit_transaction) |
217 | { | |
218 | struct jbd2_inode *jinode; | |
219 | int err, ret = 0; | |
220 | struct address_space *mapping; | |
221 | ||
222 | spin_lock(&journal->j_list_lock); | |
223 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { | |
224 | mapping = jinode->i_vfs_inode->i_mapping; | |
39e3ac25 | 225 | set_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
c851ed54 | 226 | spin_unlock(&journal->j_list_lock); |
cd1aac32 AK |
227 | /* |
228 | * submit the inode data buffers. We use writepage | |
229 | * instead of writepages. Because writepages can do | |
230 | * block allocation with delalloc. We need to write | |
231 | * only allocated blocks here. | |
232 | */ | |
879c5e6b | 233 | trace_jbd2_submit_inode_data(jinode->i_vfs_inode); |
cd1aac32 | 234 | err = journal_submit_inode_data_buffers(mapping); |
c851ed54 JK |
235 | if (!ret) |
236 | ret = err; | |
237 | spin_lock(&journal->j_list_lock); | |
238 | J_ASSERT(jinode->i_transaction == commit_transaction); | |
39e3ac25 | 239 | clear_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
4e857c58 | 240 | smp_mb__after_atomic(); |
c851ed54 JK |
241 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); |
242 | } | |
243 | spin_unlock(&journal->j_list_lock); | |
244 | return ret; | |
245 | } | |
246 | ||
247 | /* | |
248 | * Wait for data submitted for writeout, refile inodes to proper | |
249 | * transaction if needed. | |
250 | * | |
251 | */ | |
252 | static int journal_finish_inode_data_buffers(journal_t *journal, | |
253 | transaction_t *commit_transaction) | |
254 | { | |
255 | struct jbd2_inode *jinode, *next_i; | |
256 | int err, ret = 0; | |
257 | ||
cd1aac32 | 258 | /* For locking, see the comment in journal_submit_data_buffers() */ |
c851ed54 JK |
259 | spin_lock(&journal->j_list_lock); |
260 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { | |
39e3ac25 | 261 | set_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
c851ed54 JK |
262 | spin_unlock(&journal->j_list_lock); |
263 | err = filemap_fdatawait(jinode->i_vfs_inode->i_mapping); | |
e9e34f4e HK |
264 | if (err) { |
265 | /* | |
266 | * Because AS_EIO is cleared by | |
94004ed7 | 267 | * filemap_fdatawait_range(), set it again so |
e9e34f4e HK |
268 | * that user process can get -EIO from fsync(). |
269 | */ | |
270 | set_bit(AS_EIO, | |
271 | &jinode->i_vfs_inode->i_mapping->flags); | |
272 | ||
273 | if (!ret) | |
274 | ret = err; | |
275 | } | |
c851ed54 | 276 | spin_lock(&journal->j_list_lock); |
39e3ac25 | 277 | clear_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
4e857c58 | 278 | smp_mb__after_atomic(); |
c851ed54 JK |
279 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); |
280 | } | |
281 | ||
282 | /* Now refile inode to proper lists */ | |
283 | list_for_each_entry_safe(jinode, next_i, | |
284 | &commit_transaction->t_inode_list, i_list) { | |
285 | list_del(&jinode->i_list); | |
286 | if (jinode->i_next_transaction) { | |
287 | jinode->i_transaction = jinode->i_next_transaction; | |
288 | jinode->i_next_transaction = NULL; | |
289 | list_add(&jinode->i_list, | |
290 | &jinode->i_transaction->t_inode_list); | |
291 | } else { | |
292 | jinode->i_transaction = NULL; | |
293 | } | |
294 | } | |
295 | spin_unlock(&journal->j_list_lock); | |
296 | ||
297 | return ret; | |
298 | } | |
299 | ||
818d276c GS |
300 | static __u32 jbd2_checksum_data(__u32 crc32_sum, struct buffer_head *bh) |
301 | { | |
302 | struct page *page = bh->b_page; | |
303 | char *addr; | |
304 | __u32 checksum; | |
305 | ||
303a8f2a | 306 | addr = kmap_atomic(page); |
818d276c GS |
307 | checksum = crc32_be(crc32_sum, |
308 | (void *)(addr + offset_in_page(bh->b_data)), bh->b_size); | |
303a8f2a | 309 | kunmap_atomic(addr); |
818d276c GS |
310 | |
311 | return checksum; | |
312 | } | |
313 | ||
db9ee220 | 314 | static void write_tag_block(journal_t *j, journal_block_tag_t *tag, |
18eba7aa | 315 | unsigned long long block) |
b517bea1 ZB |
316 | { |
317 | tag->t_blocknr = cpu_to_be32(block & (u32)~0); | |
56316a0d | 318 | if (jbd2_has_feature_64bit(j)) |
b517bea1 ZB |
319 | tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1); |
320 | } | |
321 | ||
3caa487f | 322 | static void jbd2_descr_block_csum_set(journal_t *j, |
e5a120ae | 323 | struct buffer_head *bh) |
3caa487f DW |
324 | { |
325 | struct jbd2_journal_block_tail *tail; | |
326 | __u32 csum; | |
327 | ||
db9ee220 | 328 | if (!jbd2_journal_has_csum_v2or3(j)) |
3caa487f DW |
329 | return; |
330 | ||
e5a120ae | 331 | tail = (struct jbd2_journal_block_tail *)(bh->b_data + j->j_blocksize - |
3caa487f DW |
332 | sizeof(struct jbd2_journal_block_tail)); |
333 | tail->t_checksum = 0; | |
e5a120ae | 334 | csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize); |
3caa487f DW |
335 | tail->t_checksum = cpu_to_be32(csum); |
336 | } | |
337 | ||
c3900875 DW |
338 | static void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag, |
339 | struct buffer_head *bh, __u32 sequence) | |
340 | { | |
db9ee220 | 341 | journal_block_tag3_t *tag3 = (journal_block_tag3_t *)tag; |
c3900875 DW |
342 | struct page *page = bh->b_page; |
343 | __u8 *addr; | |
eee06c56 | 344 | __u32 csum32; |
18a6ea1e | 345 | __be32 seq; |
c3900875 | 346 | |
db9ee220 | 347 | if (!jbd2_journal_has_csum_v2or3(j)) |
c3900875 DW |
348 | return; |
349 | ||
18a6ea1e | 350 | seq = cpu_to_be32(sequence); |
906adea1 | 351 | addr = kmap_atomic(page); |
18a6ea1e | 352 | csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&seq, sizeof(seq)); |
eee06c56 DW |
353 | csum32 = jbd2_chksum(j, csum32, addr + offset_in_page(bh->b_data), |
354 | bh->b_size); | |
906adea1 | 355 | kunmap_atomic(addr); |
c3900875 | 356 | |
56316a0d | 357 | if (jbd2_has_feature_csum3(j)) |
db9ee220 DW |
358 | tag3->t_checksum = cpu_to_be32(csum32); |
359 | else | |
360 | tag->t_checksum = cpu_to_be16(csum32); | |
c3900875 | 361 | } |
470decc6 | 362 | /* |
f7f4bccb | 363 | * jbd2_journal_commit_transaction |
470decc6 DK |
364 | * |
365 | * The primary function for committing a transaction to the log. This | |
366 | * function is called by the journal thread to begin a complete commit. | |
367 | */ | |
f7f4bccb | 368 | void jbd2_journal_commit_transaction(journal_t *journal) |
470decc6 | 369 | { |
8e85fb3f | 370 | struct transaction_stats_s stats; |
470decc6 | 371 | transaction_t *commit_transaction; |
e5a120ae JK |
372 | struct journal_head *jh; |
373 | struct buffer_head *descriptor; | |
470decc6 DK |
374 | struct buffer_head **wbuf = journal->j_wbuf; |
375 | int bufs; | |
376 | int flags; | |
377 | int err; | |
18eba7aa | 378 | unsigned long long blocknr; |
e07f7183 JB |
379 | ktime_t start_time; |
380 | u64 commit_time; | |
470decc6 DK |
381 | char *tagp = NULL; |
382 | journal_header_t *header; | |
383 | journal_block_tag_t *tag = NULL; | |
384 | int space_left = 0; | |
385 | int first_tag = 0; | |
386 | int tag_flag; | |
794446c6 | 387 | int i; |
b517bea1 | 388 | int tag_bytes = journal_tag_bytes(journal); |
818d276c GS |
389 | struct buffer_head *cbh = NULL; /* For transactional checksums */ |
390 | __u32 crc32_sum = ~0; | |
82f04ab4 | 391 | struct blk_plug plug; |
3339578f JK |
392 | /* Tail of the journal */ |
393 | unsigned long first_block; | |
394 | tid_t first_tid; | |
395 | int update_tail; | |
3caa487f | 396 | int csum_size = 0; |
f5113eff | 397 | LIST_HEAD(io_bufs); |
e5a120ae | 398 | LIST_HEAD(log_bufs); |
3caa487f | 399 | |
db9ee220 | 400 | if (jbd2_journal_has_csum_v2or3(journal)) |
3caa487f | 401 | csum_size = sizeof(struct jbd2_journal_block_tail); |
470decc6 DK |
402 | |
403 | /* | |
404 | * First job: lock down the current transaction and wait for | |
405 | * all outstanding updates to complete. | |
406 | */ | |
407 | ||
f7f4bccb MC |
408 | /* Do we need to erase the effects of a prior jbd2_journal_flush? */ |
409 | if (journal->j_flags & JBD2_FLUSHED) { | |
470decc6 | 410 | jbd_debug(3, "super block updated\n"); |
a78bb11d | 411 | mutex_lock(&journal->j_checkpoint_mutex); |
79feb521 JK |
412 | /* |
413 | * We hold j_checkpoint_mutex so tail cannot change under us. | |
414 | * We don't need any special data guarantees for writing sb | |
415 | * since journal is empty and it is ok for write to be | |
416 | * flushed only with transaction commit. | |
417 | */ | |
418 | jbd2_journal_update_sb_log_tail(journal, | |
419 | journal->j_tail_sequence, | |
420 | journal->j_tail, | |
421 | WRITE_SYNC); | |
a78bb11d | 422 | mutex_unlock(&journal->j_checkpoint_mutex); |
470decc6 DK |
423 | } else { |
424 | jbd_debug(3, "superblock not updated\n"); | |
425 | } | |
426 | ||
427 | J_ASSERT(journal->j_running_transaction != NULL); | |
428 | J_ASSERT(journal->j_committing_transaction == NULL); | |
429 | ||
430 | commit_transaction = journal->j_running_transaction; | |
470decc6 | 431 | |
879c5e6b | 432 | trace_jbd2_start_commit(journal, commit_transaction); |
f2a44523 | 433 | jbd_debug(1, "JBD2: starting commit of transaction %d\n", |
470decc6 DK |
434 | commit_transaction->t_tid); |
435 | ||
a931da6a | 436 | write_lock(&journal->j_state_lock); |
3ca841c1 | 437 | J_ASSERT(commit_transaction->t_state == T_RUNNING); |
470decc6 DK |
438 | commit_transaction->t_state = T_LOCKED; |
439 | ||
879c5e6b | 440 | trace_jbd2_commit_locking(journal, commit_transaction); |
bf699327 | 441 | stats.run.rs_wait = commit_transaction->t_max_wait; |
9fff24aa | 442 | stats.run.rs_request_delay = 0; |
bf699327 | 443 | stats.run.rs_locked = jiffies; |
9fff24aa TT |
444 | if (commit_transaction->t_requested) |
445 | stats.run.rs_request_delay = | |
446 | jbd2_time_diff(commit_transaction->t_requested, | |
447 | stats.run.rs_locked); | |
bf699327 TT |
448 | stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start, |
449 | stats.run.rs_locked); | |
8e85fb3f | 450 | |
470decc6 | 451 | spin_lock(&commit_transaction->t_handle_lock); |
a51dca9c | 452 | while (atomic_read(&commit_transaction->t_updates)) { |
470decc6 DK |
453 | DEFINE_WAIT(wait); |
454 | ||
455 | prepare_to_wait(&journal->j_wait_updates, &wait, | |
456 | TASK_UNINTERRUPTIBLE); | |
a51dca9c | 457 | if (atomic_read(&commit_transaction->t_updates)) { |
470decc6 | 458 | spin_unlock(&commit_transaction->t_handle_lock); |
a931da6a | 459 | write_unlock(&journal->j_state_lock); |
470decc6 | 460 | schedule(); |
a931da6a | 461 | write_lock(&journal->j_state_lock); |
470decc6 DK |
462 | spin_lock(&commit_transaction->t_handle_lock); |
463 | } | |
464 | finish_wait(&journal->j_wait_updates, &wait); | |
465 | } | |
466 | spin_unlock(&commit_transaction->t_handle_lock); | |
467 | ||
a51dca9c | 468 | J_ASSERT (atomic_read(&commit_transaction->t_outstanding_credits) <= |
470decc6 DK |
469 | journal->j_max_transaction_buffers); |
470 | ||
471 | /* | |
472 | * First thing we are allowed to do is to discard any remaining | |
473 | * BJ_Reserved buffers. Note, it is _not_ permissible to assume | |
474 | * that there are no such buffers: if a large filesystem | |
475 | * operation like a truncate needs to split itself over multiple | |
f7f4bccb | 476 | * transactions, then it may try to do a jbd2_journal_restart() while |
470decc6 DK |
477 | * there are still BJ_Reserved buffers outstanding. These must |
478 | * be released cleanly from the current transaction. | |
479 | * | |
480 | * In this case, the filesystem must still reserve write access | |
481 | * again before modifying the buffer in the new transaction, but | |
482 | * we do not require it to remember exactly which old buffers it | |
483 | * has reserved. This is consistent with the existing behaviour | |
f7f4bccb | 484 | * that multiple jbd2_journal_get_write_access() calls to the same |
25985edc | 485 | * buffer are perfectly permissible. |
470decc6 DK |
486 | */ |
487 | while (commit_transaction->t_reserved_list) { | |
488 | jh = commit_transaction->t_reserved_list; | |
489 | JBUFFER_TRACE(jh, "reserved, unused: refile"); | |
490 | /* | |
f7f4bccb | 491 | * A jbd2_journal_get_undo_access()+jbd2_journal_release_buffer() may |
470decc6 DK |
492 | * leave undo-committed data. |
493 | */ | |
494 | if (jh->b_committed_data) { | |
495 | struct buffer_head *bh = jh2bh(jh); | |
496 | ||
497 | jbd_lock_bh_state(bh); | |
af1e76d6 | 498 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
499 | jh->b_committed_data = NULL; |
500 | jbd_unlock_bh_state(bh); | |
501 | } | |
f7f4bccb | 502 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
503 | } |
504 | ||
505 | /* | |
506 | * Now try to drop any written-back buffers from the journal's | |
507 | * checkpoint lists. We do this *before* commit because it potentially | |
508 | * frees some memory | |
509 | */ | |
510 | spin_lock(&journal->j_list_lock); | |
841df7df | 511 | __jbd2_journal_clean_checkpoint_list(journal, false); |
470decc6 DK |
512 | spin_unlock(&journal->j_list_lock); |
513 | ||
f2a44523 | 514 | jbd_debug(3, "JBD2: commit phase 1\n"); |
470decc6 | 515 | |
1ba37268 YY |
516 | /* |
517 | * Clear revoked flag to reflect there is no revoked buffers | |
518 | * in the next transaction which is going to be started. | |
519 | */ | |
520 | jbd2_clear_buffer_revoked_flags(journal); | |
521 | ||
470decc6 DK |
522 | /* |
523 | * Switch to a new revoke table. | |
524 | */ | |
f7f4bccb | 525 | jbd2_journal_switch_revoke_table(journal); |
470decc6 | 526 | |
8f7d89f3 JK |
527 | /* |
528 | * Reserved credits cannot be claimed anymore, free them | |
529 | */ | |
530 | atomic_sub(atomic_read(&journal->j_reserved_credits), | |
531 | &commit_transaction->t_outstanding_credits); | |
532 | ||
879c5e6b | 533 | trace_jbd2_commit_flushing(journal, commit_transaction); |
bf699327 TT |
534 | stats.run.rs_flushing = jiffies; |
535 | stats.run.rs_locked = jbd2_time_diff(stats.run.rs_locked, | |
536 | stats.run.rs_flushing); | |
8e85fb3f | 537 | |
470decc6 DK |
538 | commit_transaction->t_state = T_FLUSH; |
539 | journal->j_committing_transaction = commit_transaction; | |
540 | journal->j_running_transaction = NULL; | |
e07f7183 | 541 | start_time = ktime_get(); |
470decc6 DK |
542 | commit_transaction->t_log_start = journal->j_head; |
543 | wake_up(&journal->j_wait_transaction_locked); | |
a931da6a | 544 | write_unlock(&journal->j_state_lock); |
470decc6 | 545 | |
cfc7bc89 | 546 | jbd_debug(3, "JBD2: commit phase 2a\n"); |
470decc6 | 547 | |
470decc6 DK |
548 | /* |
549 | * Now start flushing things to disk, in the order they appear | |
550 | * on the transaction lists. Data blocks go first. | |
551 | */ | |
cd1aac32 | 552 | err = journal_submit_data_buffers(journal, commit_transaction); |
470decc6 | 553 | if (err) |
a7fa2baf | 554 | jbd2_journal_abort(journal, err); |
470decc6 | 555 | |
82f04ab4 | 556 | blk_start_plug(&plug); |
9bcf976c | 557 | jbd2_journal_write_revoke_records(commit_transaction, &log_bufs); |
470decc6 | 558 | |
cfc7bc89 | 559 | jbd_debug(3, "JBD2: commit phase 2b\n"); |
470decc6 | 560 | |
470decc6 DK |
561 | /* |
562 | * Way to go: we have now written out all of the data for a | |
563 | * transaction! Now comes the tricky part: we need to write out | |
564 | * metadata. Loop over the transaction's entire buffer list: | |
565 | */ | |
a931da6a | 566 | write_lock(&journal->j_state_lock); |
470decc6 | 567 | commit_transaction->t_state = T_COMMIT; |
a931da6a | 568 | write_unlock(&journal->j_state_lock); |
470decc6 | 569 | |
879c5e6b | 570 | trace_jbd2_commit_logging(journal, commit_transaction); |
bf699327 TT |
571 | stats.run.rs_logging = jiffies; |
572 | stats.run.rs_flushing = jbd2_time_diff(stats.run.rs_flushing, | |
573 | stats.run.rs_logging); | |
a51dca9c TT |
574 | stats.run.rs_blocks = |
575 | atomic_read(&commit_transaction->t_outstanding_credits); | |
bf699327 | 576 | stats.run.rs_blocks_logged = 0; |
8e85fb3f | 577 | |
1dfc3220 | 578 | J_ASSERT(commit_transaction->t_nr_buffers <= |
a51dca9c | 579 | atomic_read(&commit_transaction->t_outstanding_credits)); |
1dfc3220 | 580 | |
87c89c23 | 581 | err = 0; |
470decc6 | 582 | bufs = 0; |
e5a120ae | 583 | descriptor = NULL; |
470decc6 DK |
584 | while (commit_transaction->t_buffers) { |
585 | ||
586 | /* Find the next buffer to be journaled... */ | |
587 | ||
588 | jh = commit_transaction->t_buffers; | |
589 | ||
590 | /* If we're in abort mode, we just un-journal the buffer and | |
7ad7445f | 591 | release it. */ |
470decc6 DK |
592 | |
593 | if (is_journal_aborted(journal)) { | |
7ad7445f | 594 | clear_buffer_jbddirty(jh2bh(jh)); |
470decc6 | 595 | JBUFFER_TRACE(jh, "journal is aborting: refile"); |
e06c8227 JB |
596 | jbd2_buffer_abort_trigger(jh, |
597 | jh->b_frozen_data ? | |
598 | jh->b_frozen_triggers : | |
599 | jh->b_triggers); | |
f7f4bccb | 600 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
601 | /* If that was the last one, we need to clean up |
602 | * any descriptor buffers which may have been | |
603 | * already allocated, even if we are now | |
604 | * aborting. */ | |
605 | if (!commit_transaction->t_buffers) | |
606 | goto start_journal_io; | |
607 | continue; | |
608 | } | |
609 | ||
610 | /* Make sure we have a descriptor block in which to | |
611 | record the metadata buffer. */ | |
612 | ||
613 | if (!descriptor) { | |
470decc6 DK |
614 | J_ASSERT (bufs == 0); |
615 | ||
f2a44523 | 616 | jbd_debug(4, "JBD2: get descriptor\n"); |
470decc6 | 617 | |
f7f4bccb | 618 | descriptor = jbd2_journal_get_descriptor_buffer(journal); |
470decc6 | 619 | if (!descriptor) { |
a7fa2baf | 620 | jbd2_journal_abort(journal, -EIO); |
470decc6 DK |
621 | continue; |
622 | } | |
623 | ||
f2a44523 | 624 | jbd_debug(4, "JBD2: got buffer %llu (%p)\n", |
e5a120ae JK |
625 | (unsigned long long)descriptor->b_blocknr, |
626 | descriptor->b_data); | |
627 | header = (journal_header_t *)descriptor->b_data; | |
f7f4bccb MC |
628 | header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); |
629 | header->h_blocktype = cpu_to_be32(JBD2_DESCRIPTOR_BLOCK); | |
470decc6 DK |
630 | header->h_sequence = cpu_to_be32(commit_transaction->t_tid); |
631 | ||
e5a120ae JK |
632 | tagp = &descriptor->b_data[sizeof(journal_header_t)]; |
633 | space_left = descriptor->b_size - | |
634 | sizeof(journal_header_t); | |
470decc6 | 635 | first_tag = 1; |
e5a120ae JK |
636 | set_buffer_jwrite(descriptor); |
637 | set_buffer_dirty(descriptor); | |
638 | wbuf[bufs++] = descriptor; | |
470decc6 DK |
639 | |
640 | /* Record it so that we can wait for IO | |
641 | completion later */ | |
e5a120ae JK |
642 | BUFFER_TRACE(descriptor, "ph3: file as descriptor"); |
643 | jbd2_file_log_bh(&log_bufs, descriptor); | |
470decc6 DK |
644 | } |
645 | ||
646 | /* Where is the buffer to be written? */ | |
647 | ||
f7f4bccb | 648 | err = jbd2_journal_next_log_block(journal, &blocknr); |
470decc6 DK |
649 | /* If the block mapping failed, just abandon the buffer |
650 | and repeat this loop: we'll fall into the | |
651 | refile-on-abort condition above. */ | |
652 | if (err) { | |
a7fa2baf | 653 | jbd2_journal_abort(journal, err); |
470decc6 DK |
654 | continue; |
655 | } | |
656 | ||
657 | /* | |
658 | * start_this_handle() uses t_outstanding_credits to determine | |
659 | * the free space in the log, but this counter is changed | |
f7f4bccb | 660 | * by jbd2_journal_next_log_block() also. |
470decc6 | 661 | */ |
a51dca9c | 662 | atomic_dec(&commit_transaction->t_outstanding_credits); |
470decc6 DK |
663 | |
664 | /* Bump b_count to prevent truncate from stumbling over | |
665 | the shadowed buffer! @@@ This can go if we ever get | |
f5113eff | 666 | rid of the shadow pairing of buffers. */ |
470decc6 DK |
667 | atomic_inc(&jh2bh(jh)->b_count); |
668 | ||
470decc6 | 669 | /* |
f5113eff JK |
670 | * Make a temporary IO buffer with which to write it out |
671 | * (this will requeue the metadata buffer to BJ_Shadow). | |
470decc6 | 672 | */ |
f5113eff | 673 | set_bit(BH_JWrite, &jh2bh(jh)->b_state); |
470decc6 | 674 | JBUFFER_TRACE(jh, "ph3: write metadata"); |
f7f4bccb | 675 | flags = jbd2_journal_write_metadata_buffer(commit_transaction, |
f5113eff | 676 | jh, &wbuf[bufs], blocknr); |
e6ec116b TT |
677 | if (flags < 0) { |
678 | jbd2_journal_abort(journal, flags); | |
679 | continue; | |
680 | } | |
f5113eff | 681 | jbd2_file_log_bh(&io_bufs, wbuf[bufs]); |
470decc6 DK |
682 | |
683 | /* Record the new block's tag in the current descriptor | |
684 | buffer */ | |
685 | ||
686 | tag_flag = 0; | |
687 | if (flags & 1) | |
f7f4bccb | 688 | tag_flag |= JBD2_FLAG_ESCAPE; |
470decc6 | 689 | if (!first_tag) |
f7f4bccb | 690 | tag_flag |= JBD2_FLAG_SAME_UUID; |
470decc6 DK |
691 | |
692 | tag = (journal_block_tag_t *) tagp; | |
db9ee220 | 693 | write_tag_block(journal, tag, jh2bh(jh)->b_blocknr); |
8f888ef8 | 694 | tag->t_flags = cpu_to_be16(tag_flag); |
f5113eff | 695 | jbd2_block_tag_csum_set(journal, tag, wbuf[bufs], |
c3900875 | 696 | commit_transaction->t_tid); |
b517bea1 ZB |
697 | tagp += tag_bytes; |
698 | space_left -= tag_bytes; | |
f5113eff | 699 | bufs++; |
470decc6 DK |
700 | |
701 | if (first_tag) { | |
702 | memcpy (tagp, journal->j_uuid, 16); | |
703 | tagp += 16; | |
704 | space_left -= 16; | |
705 | first_tag = 0; | |
706 | } | |
707 | ||
708 | /* If there's no more to do, or if the descriptor is full, | |
709 | let the IO rip! */ | |
710 | ||
711 | if (bufs == journal->j_wbufsize || | |
712 | commit_transaction->t_buffers == NULL || | |
3caa487f | 713 | space_left < tag_bytes + 16 + csum_size) { |
470decc6 | 714 | |
f2a44523 | 715 | jbd_debug(4, "JBD2: Submit %d IOs\n", bufs); |
470decc6 DK |
716 | |
717 | /* Write an end-of-descriptor marker before | |
718 | submitting the IOs. "tag" still points to | |
719 | the last tag we set up. */ | |
720 | ||
8f888ef8 | 721 | tag->t_flags |= cpu_to_be16(JBD2_FLAG_LAST_TAG); |
470decc6 | 722 | |
3caa487f | 723 | jbd2_descr_block_csum_set(journal, descriptor); |
470decc6 DK |
724 | start_journal_io: |
725 | for (i = 0; i < bufs; i++) { | |
726 | struct buffer_head *bh = wbuf[i]; | |
818d276c GS |
727 | /* |
728 | * Compute checksum. | |
729 | */ | |
56316a0d | 730 | if (jbd2_has_feature_checksum(journal)) { |
818d276c GS |
731 | crc32_sum = |
732 | jbd2_checksum_data(crc32_sum, bh); | |
733 | } | |
734 | ||
470decc6 DK |
735 | lock_buffer(bh); |
736 | clear_buffer_dirty(bh); | |
737 | set_buffer_uptodate(bh); | |
738 | bh->b_end_io = journal_end_buffer_io_sync; | |
82f04ab4 | 739 | submit_bh(WRITE_SYNC, bh); |
470decc6 DK |
740 | } |
741 | cond_resched(); | |
bf699327 | 742 | stats.run.rs_blocks_logged += bufs; |
470decc6 DK |
743 | |
744 | /* Force a new descriptor to be generated next | |
745 | time round the loop. */ | |
746 | descriptor = NULL; | |
747 | bufs = 0; | |
748 | } | |
749 | } | |
750 | ||
f73bee49 JK |
751 | err = journal_finish_inode_data_buffers(journal, commit_transaction); |
752 | if (err) { | |
753 | printk(KERN_WARNING | |
754 | "JBD2: Detected IO errors while flushing file data " | |
755 | "on %s\n", journal->j_devname); | |
756 | if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR) | |
757 | jbd2_journal_abort(journal, err); | |
758 | err = 0; | |
759 | } | |
760 | ||
3339578f JK |
761 | /* |
762 | * Get current oldest transaction in the log before we issue flush | |
763 | * to the filesystem device. After the flush we can be sure that | |
764 | * blocks of all older transactions are checkpointed to persistent | |
765 | * storage and we will be safe to update journal start in the | |
766 | * superblock with the numbers we get here. | |
767 | */ | |
768 | update_tail = | |
769 | jbd2_journal_get_log_tail(journal, &first_tid, &first_block); | |
770 | ||
bbd2be36 | 771 | write_lock(&journal->j_state_lock); |
3339578f JK |
772 | if (update_tail) { |
773 | long freed = first_block - journal->j_tail; | |
774 | ||
775 | if (first_block < journal->j_tail) | |
776 | freed += journal->j_last - journal->j_first; | |
777 | /* Update tail only if we free significant amount of space */ | |
778 | if (freed < journal->j_maxlen / 4) | |
779 | update_tail = 0; | |
780 | } | |
bbd2be36 JK |
781 | J_ASSERT(commit_transaction->t_state == T_COMMIT); |
782 | commit_transaction->t_state = T_COMMIT_DFLUSH; | |
783 | write_unlock(&journal->j_state_lock); | |
3339578f | 784 | |
cc3e1bea TT |
785 | /* |
786 | * If the journal is not located on the file system device, | |
787 | * then we must flush the file system device before we issue | |
788 | * the commit record | |
789 | */ | |
81be12c8 | 790 | if (commit_transaction->t_need_data_flush && |
cc3e1bea TT |
791 | (journal->j_fs_dev != journal->j_dev) && |
792 | (journal->j_flags & JBD2_BARRIER)) | |
99aa7846 | 793 | blkdev_issue_flush(journal->j_fs_dev, GFP_NOFS, NULL); |
818d276c | 794 | |
cc3e1bea | 795 | /* Done it all: now write the commit record asynchronously. */ |
56316a0d | 796 | if (jbd2_has_feature_async_commit(journal)) { |
818d276c GS |
797 | err = journal_submit_commit_record(journal, commit_transaction, |
798 | &cbh, crc32_sum); | |
799 | if (err) | |
800 | __jbd2_journal_abort_hard(journal); | |
e9e34f4e | 801 | } |
c851ed54 | 802 | |
82f04ab4 JA |
803 | blk_finish_plug(&plug); |
804 | ||
470decc6 DK |
805 | /* Lo and behold: we have just managed to send a transaction to |
806 | the log. Before we can commit it, wait for the IO so far to | |
807 | complete. Control buffers being written are on the | |
808 | transaction's t_log_list queue, and metadata buffers are on | |
f5113eff | 809 | the io_bufs list. |
470decc6 DK |
810 | |
811 | Wait for the buffers in reverse order. That way we are | |
812 | less likely to be woken up until all IOs have completed, and | |
813 | so we incur less scheduling load. | |
814 | */ | |
815 | ||
f2a44523 | 816 | jbd_debug(3, "JBD2: commit phase 3\n"); |
470decc6 | 817 | |
f5113eff JK |
818 | while (!list_empty(&io_bufs)) { |
819 | struct buffer_head *bh = list_entry(io_bufs.prev, | |
820 | struct buffer_head, | |
821 | b_assoc_buffers); | |
470decc6 | 822 | |
f5113eff JK |
823 | wait_on_buffer(bh); |
824 | cond_resched(); | |
470decc6 DK |
825 | |
826 | if (unlikely(!buffer_uptodate(bh))) | |
827 | err = -EIO; | |
f5113eff | 828 | jbd2_unfile_log_bh(bh); |
470decc6 DK |
829 | |
830 | /* | |
f5113eff JK |
831 | * The list contains temporary buffer heads created by |
832 | * jbd2_journal_write_metadata_buffer(). | |
470decc6 DK |
833 | */ |
834 | BUFFER_TRACE(bh, "dumping temporary bh"); | |
470decc6 DK |
835 | __brelse(bh); |
836 | J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0); | |
837 | free_buffer_head(bh); | |
838 | ||
f5113eff | 839 | /* We also have to refile the corresponding shadowed buffer */ |
470decc6 DK |
840 | jh = commit_transaction->t_shadow_list->b_tprev; |
841 | bh = jh2bh(jh); | |
f5113eff | 842 | clear_buffer_jwrite(bh); |
470decc6 | 843 | J_ASSERT_BH(bh, buffer_jbddirty(bh)); |
b34090e5 | 844 | J_ASSERT_BH(bh, !buffer_shadow(bh)); |
470decc6 DK |
845 | |
846 | /* The metadata is now released for reuse, but we need | |
847 | to remember it against this transaction so that when | |
848 | we finally commit, we can do any checkpointing | |
849 | required. */ | |
850 | JBUFFER_TRACE(jh, "file as BJ_Forget"); | |
f7f4bccb | 851 | jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget); |
470decc6 DK |
852 | JBUFFER_TRACE(jh, "brelse shadowed buffer"); |
853 | __brelse(bh); | |
854 | } | |
855 | ||
856 | J_ASSERT (commit_transaction->t_shadow_list == NULL); | |
857 | ||
f2a44523 | 858 | jbd_debug(3, "JBD2: commit phase 4\n"); |
470decc6 DK |
859 | |
860 | /* Here we wait for the revoke record and descriptor record buffers */ | |
e5a120ae | 861 | while (!list_empty(&log_bufs)) { |
470decc6 DK |
862 | struct buffer_head *bh; |
863 | ||
e5a120ae JK |
864 | bh = list_entry(log_bufs.prev, struct buffer_head, b_assoc_buffers); |
865 | wait_on_buffer(bh); | |
866 | cond_resched(); | |
470decc6 DK |
867 | |
868 | if (unlikely(!buffer_uptodate(bh))) | |
869 | err = -EIO; | |
870 | ||
871 | BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile"); | |
872 | clear_buffer_jwrite(bh); | |
e5a120ae | 873 | jbd2_unfile_log_bh(bh); |
470decc6 DK |
874 | __brelse(bh); /* One for getblk */ |
875 | /* AKPM: bforget here */ | |
876 | } | |
877 | ||
77e841de HK |
878 | if (err) |
879 | jbd2_journal_abort(journal, err); | |
880 | ||
f2a44523 | 881 | jbd_debug(3, "JBD2: commit phase 5\n"); |
bbd2be36 JK |
882 | write_lock(&journal->j_state_lock); |
883 | J_ASSERT(commit_transaction->t_state == T_COMMIT_DFLUSH); | |
884 | commit_transaction->t_state = T_COMMIT_JFLUSH; | |
885 | write_unlock(&journal->j_state_lock); | |
470decc6 | 886 | |
56316a0d | 887 | if (!jbd2_has_feature_async_commit(journal)) { |
818d276c GS |
888 | err = journal_submit_commit_record(journal, commit_transaction, |
889 | &cbh, crc32_sum); | |
890 | if (err) | |
891 | __jbd2_journal_abort_hard(journal); | |
892 | } | |
6cba611e | 893 | if (cbh) |
fd98496f | 894 | err = journal_wait_on_commit_record(journal, cbh); |
56316a0d | 895 | if (jbd2_has_feature_async_commit(journal) && |
f73bee49 | 896 | journal->j_flags & JBD2_BARRIER) { |
99aa7846 | 897 | blkdev_issue_flush(journal->j_dev, GFP_NOFS, NULL); |
f73bee49 | 898 | } |
470decc6 DK |
899 | |
900 | if (err) | |
a7fa2baf | 901 | jbd2_journal_abort(journal, err); |
470decc6 | 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 | ||
f2a44523 | 916 | jbd_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; |
470decc6 DK |
933 | |
934 | jh = commit_transaction->t_forget; | |
935 | spin_unlock(&journal->j_list_lock); | |
936 | bh = jh2bh(jh); | |
de1b7941 JK |
937 | /* |
938 | * Get a reference so that bh cannot be freed before we are | |
939 | * done with it. | |
940 | */ | |
941 | get_bh(bh); | |
470decc6 | 942 | jbd_lock_bh_state(bh); |
23e2af35 | 943 | J_ASSERT_JH(jh, jh->b_transaction == commit_transaction); |
470decc6 DK |
944 | |
945 | /* | |
946 | * If there is undo-protected committed data against | |
947 | * this buffer, then we can remove it now. If it is a | |
948 | * buffer needing such protection, the old frozen_data | |
949 | * field now points to a committed version of the | |
950 | * buffer, so rotate that field to the new committed | |
951 | * data. | |
952 | * | |
953 | * Otherwise, we can just throw away the frozen data now. | |
e06c8227 JB |
954 | * |
955 | * We also know that the frozen data has already fired | |
956 | * its triggers if they exist, so we can clear that too. | |
470decc6 DK |
957 | */ |
958 | if (jh->b_committed_data) { | |
af1e76d6 | 959 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
960 | jh->b_committed_data = NULL; |
961 | if (jh->b_frozen_data) { | |
962 | jh->b_committed_data = jh->b_frozen_data; | |
963 | jh->b_frozen_data = NULL; | |
e06c8227 | 964 | jh->b_frozen_triggers = NULL; |
470decc6 DK |
965 | } |
966 | } else if (jh->b_frozen_data) { | |
af1e76d6 | 967 | jbd2_free(jh->b_frozen_data, bh->b_size); |
470decc6 | 968 | jh->b_frozen_data = NULL; |
e06c8227 | 969 | jh->b_frozen_triggers = NULL; |
470decc6 DK |
970 | } |
971 | ||
972 | spin_lock(&journal->j_list_lock); | |
973 | cp_transaction = jh->b_cp_transaction; | |
974 | if (cp_transaction) { | |
975 | JBUFFER_TRACE(jh, "remove from old cp transaction"); | |
8e85fb3f | 976 | cp_transaction->t_chp_stats.cs_dropped++; |
f7f4bccb | 977 | __jbd2_journal_remove_checkpoint(jh); |
470decc6 DK |
978 | } |
979 | ||
980 | /* Only re-checkpoint the buffer_head if it is marked | |
981 | * dirty. If the buffer was added to the BJ_Forget list | |
f7f4bccb | 982 | * by jbd2_journal_forget, it may no longer be dirty and |
470decc6 DK |
983 | * there's no point in keeping a checkpoint record for |
984 | * it. */ | |
985 | ||
b794e7a6 JK |
986 | /* |
987 | * A buffer which has been freed while still being journaled by | |
988 | * a previous transaction. | |
989 | */ | |
990 | if (buffer_freed(bh)) { | |
991 | /* | |
992 | * If the running transaction is the one containing | |
993 | * "add to orphan" operation (b_next_transaction != | |
994 | * NULL), we have to wait for that transaction to | |
995 | * commit before we can really get rid of the buffer. | |
996 | * So just clear b_modified to not confuse transaction | |
997 | * credit accounting and refile the buffer to | |
998 | * BJ_Forget of the running transaction. If the just | |
999 | * committed transaction contains "add to orphan" | |
1000 | * operation, we can completely invalidate the buffer | |
1001 | * now. We are rather through in that since the | |
1002 | * buffer may be still accessible when blocksize < | |
1003 | * pagesize and it is attached to the last partial | |
1004 | * page. | |
1005 | */ | |
1006 | jh->b_modified = 0; | |
1007 | if (!jh->b_next_transaction) { | |
1008 | clear_buffer_freed(bh); | |
1009 | clear_buffer_jbddirty(bh); | |
1010 | clear_buffer_mapped(bh); | |
1011 | clear_buffer_new(bh); | |
1012 | clear_buffer_req(bh); | |
1013 | bh->b_bdev = NULL; | |
1014 | } | |
470decc6 DK |
1015 | } |
1016 | ||
1017 | if (buffer_jbddirty(bh)) { | |
1018 | JBUFFER_TRACE(jh, "add to new checkpointing trans"); | |
f7f4bccb | 1019 | __jbd2_journal_insert_checkpoint(jh, commit_transaction); |
7ad7445f HK |
1020 | if (is_journal_aborted(journal)) |
1021 | clear_buffer_jbddirty(bh); | |
470decc6 DK |
1022 | } else { |
1023 | J_ASSERT_BH(bh, !buffer_dirty(bh)); | |
de1b7941 JK |
1024 | /* |
1025 | * The buffer on BJ_Forget list and not jbddirty means | |
470decc6 DK |
1026 | * it has been freed by this transaction and hence it |
1027 | * could not have been reallocated until this | |
1028 | * transaction has committed. *BUT* it could be | |
1029 | * reallocated once we have written all the data to | |
1030 | * disk and before we process the buffer on BJ_Forget | |
de1b7941 JK |
1031 | * list. |
1032 | */ | |
1033 | if (!jh->b_next_transaction) | |
1034 | try_to_free = 1; | |
470decc6 | 1035 | } |
de1b7941 JK |
1036 | JBUFFER_TRACE(jh, "refile or unfile buffer"); |
1037 | __jbd2_journal_refile_buffer(jh); | |
1038 | jbd_unlock_bh_state(bh); | |
1039 | if (try_to_free) | |
1040 | release_buffer_page(bh); /* Drops bh reference */ | |
1041 | else | |
1042 | __brelse(bh); | |
470decc6 DK |
1043 | cond_resched_lock(&journal->j_list_lock); |
1044 | } | |
1045 | spin_unlock(&journal->j_list_lock); | |
1046 | /* | |
f5a7a6b0 JK |
1047 | * This is a bit sleazy. We use j_list_lock to protect transition |
1048 | * of a transaction into T_FINISHED state and calling | |
1049 | * __jbd2_journal_drop_transaction(). Otherwise we could race with | |
1050 | * other checkpointing code processing the transaction... | |
470decc6 | 1051 | */ |
a931da6a | 1052 | write_lock(&journal->j_state_lock); |
470decc6 DK |
1053 | spin_lock(&journal->j_list_lock); |
1054 | /* | |
1055 | * Now recheck if some buffers did not get attached to the transaction | |
1056 | * while the lock was dropped... | |
1057 | */ | |
1058 | if (commit_transaction->t_forget) { | |
1059 | spin_unlock(&journal->j_list_lock); | |
a931da6a | 1060 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
1061 | goto restart_loop; |
1062 | } | |
1063 | ||
d4e839d4 TT |
1064 | /* Add the transaction to the checkpoint list |
1065 | * __journal_remove_checkpoint() can not destroy transaction | |
1066 | * under us because it is not marked as T_FINISHED yet */ | |
1067 | if (journal->j_checkpoint_transactions == NULL) { | |
1068 | journal->j_checkpoint_transactions = commit_transaction; | |
1069 | commit_transaction->t_cpnext = commit_transaction; | |
1070 | commit_transaction->t_cpprev = commit_transaction; | |
1071 | } else { | |
1072 | commit_transaction->t_cpnext = | |
1073 | journal->j_checkpoint_transactions; | |
1074 | commit_transaction->t_cpprev = | |
1075 | commit_transaction->t_cpnext->t_cpprev; | |
1076 | commit_transaction->t_cpnext->t_cpprev = | |
1077 | commit_transaction; | |
1078 | commit_transaction->t_cpprev->t_cpnext = | |
1079 | commit_transaction; | |
1080 | } | |
1081 | spin_unlock(&journal->j_list_lock); | |
1082 | ||
470decc6 DK |
1083 | /* Done with this transaction! */ |
1084 | ||
f2a44523 | 1085 | jbd_debug(3, "JBD2: commit phase 7\n"); |
470decc6 | 1086 | |
bbd2be36 | 1087 | J_ASSERT(commit_transaction->t_state == T_COMMIT_JFLUSH); |
470decc6 | 1088 | |
8e85fb3f | 1089 | commit_transaction->t_start = jiffies; |
bf699327 TT |
1090 | stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging, |
1091 | commit_transaction->t_start); | |
8e85fb3f JL |
1092 | |
1093 | /* | |
bf699327 | 1094 | * File the transaction statistics |
8e85fb3f | 1095 | */ |
8e85fb3f | 1096 | stats.ts_tid = commit_transaction->t_tid; |
8dd42046 TT |
1097 | stats.run.rs_handle_count = |
1098 | atomic_read(&commit_transaction->t_handle_count); | |
bf699327 TT |
1099 | trace_jbd2_run_stats(journal->j_fs_dev->bd_dev, |
1100 | commit_transaction->t_tid, &stats.run); | |
42cf3452 | 1101 | stats.ts_requested = (commit_transaction->t_requested) ? 1 : 0; |
8e85fb3f | 1102 | |
794446c6 | 1103 | commit_transaction->t_state = T_COMMIT_CALLBACK; |
470decc6 DK |
1104 | J_ASSERT(commit_transaction == journal->j_committing_transaction); |
1105 | journal->j_commit_sequence = commit_transaction->t_tid; | |
1106 | journal->j_committing_transaction = NULL; | |
e07f7183 | 1107 | commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time)); |
470decc6 | 1108 | |
e07f7183 JB |
1109 | /* |
1110 | * weight the commit time higher than the average time so we don't | |
1111 | * react too strongly to vast changes in the commit time | |
1112 | */ | |
1113 | if (likely(journal->j_average_commit_time)) | |
1114 | journal->j_average_commit_time = (commit_time + | |
1115 | journal->j_average_commit_time*3) / 4; | |
1116 | else | |
1117 | journal->j_average_commit_time = commit_time; | |
794446c6 | 1118 | |
a931da6a | 1119 | write_unlock(&journal->j_state_lock); |
6c20ec85 | 1120 | |
fb68407b AK |
1121 | if (journal->j_commit_callback) |
1122 | journal->j_commit_callback(journal, commit_transaction); | |
1123 | ||
879c5e6b | 1124 | trace_jbd2_end_commit(journal, commit_transaction); |
f2a44523 | 1125 | jbd_debug(1, "JBD2: commit %d complete, head %d\n", |
470decc6 DK |
1126 | journal->j_commit_sequence, journal->j_tail_sequence); |
1127 | ||
794446c6 DM |
1128 | write_lock(&journal->j_state_lock); |
1129 | spin_lock(&journal->j_list_lock); | |
1130 | commit_transaction->t_state = T_FINISHED; | |
d4e839d4 | 1131 | /* Check if the transaction can be dropped now that we are finished */ |
794446c6 DM |
1132 | if (commit_transaction->t_checkpoint_list == NULL && |
1133 | commit_transaction->t_checkpoint_io_list == NULL) { | |
1134 | __jbd2_journal_drop_transaction(journal, commit_transaction); | |
1135 | jbd2_journal_free_transaction(commit_transaction); | |
1136 | } | |
1137 | spin_unlock(&journal->j_list_lock); | |
1138 | write_unlock(&journal->j_state_lock); | |
470decc6 | 1139 | wake_up(&journal->j_wait_done_commit); |
42cf3452 TT |
1140 | |
1141 | /* | |
1142 | * Calculate overall stats | |
1143 | */ | |
1144 | spin_lock(&journal->j_history_lock); | |
1145 | journal->j_stats.ts_tid++; | |
1146 | journal->j_stats.ts_requested += stats.ts_requested; | |
1147 | journal->j_stats.run.rs_wait += stats.run.rs_wait; | |
1148 | journal->j_stats.run.rs_request_delay += stats.run.rs_request_delay; | |
1149 | journal->j_stats.run.rs_running += stats.run.rs_running; | |
1150 | journal->j_stats.run.rs_locked += stats.run.rs_locked; | |
1151 | journal->j_stats.run.rs_flushing += stats.run.rs_flushing; | |
1152 | journal->j_stats.run.rs_logging += stats.run.rs_logging; | |
1153 | journal->j_stats.run.rs_handle_count += stats.run.rs_handle_count; | |
1154 | journal->j_stats.run.rs_blocks += stats.run.rs_blocks; | |
1155 | journal->j_stats.run.rs_blocks_logged += stats.run.rs_blocks_logged; | |
1156 | spin_unlock(&journal->j_history_lock); | |
470decc6 | 1157 | } |