Commit | Line | Data |
---|---|---|
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 GS |
144 | |
145 | if (JBD2_HAS_COMPAT_FEATURE(journal, | |
146 | JBD2_FEATURE_COMPAT_CHECKSUM)) { | |
147 | tmp->h_chksum_type = JBD2_CRC32_CHKSUM; | |
148 | tmp->h_chksum_size = JBD2_CRC32_CHKSUM_SIZE; | |
149 | tmp->h_chksum[0] = cpu_to_be32(crc32_sum); | |
470decc6 | 150 | } |
e5a120ae | 151 | jbd2_commit_block_csum_set(journal, bh); |
470decc6 | 152 | |
e5a120ae | 153 | BUFFER_TRACE(bh, "submit commit block"); |
818d276c | 154 | lock_buffer(bh); |
45a90bfd | 155 | clear_buffer_dirty(bh); |
818d276c GS |
156 | set_buffer_uptodate(bh); |
157 | bh->b_end_io = journal_end_buffer_io_sync; | |
158 | ||
159 | if (journal->j_flags & JBD2_BARRIER && | |
0e3d2a63 | 160 | !JBD2_HAS_INCOMPAT_FEATURE(journal, |
9c35575b | 161 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) |
721a9602 | 162 | ret = submit_bh(WRITE_SYNC | WRITE_FLUSH_FUA, bh); |
9c35575b | 163 | else |
721a9602 | 164 | ret = submit_bh(WRITE_SYNC, bh); |
9c35575b | 165 | |
818d276c GS |
166 | *cbh = bh; |
167 | return ret; | |
168 | } | |
169 | ||
170 | /* | |
171 | * This function along with journal_submit_commit_record | |
172 | * allows to write the commit record asynchronously. | |
173 | */ | |
fd98496f TT |
174 | static int journal_wait_on_commit_record(journal_t *journal, |
175 | struct buffer_head *bh) | |
818d276c GS |
176 | { |
177 | int ret = 0; | |
178 | ||
179 | clear_buffer_dirty(bh); | |
180 | wait_on_buffer(bh); | |
470decc6 | 181 | |
818d276c GS |
182 | if (unlikely(!buffer_uptodate(bh))) |
183 | ret = -EIO; | |
184 | put_bh(bh); /* One for getblk() */ | |
818d276c GS |
185 | |
186 | return ret; | |
470decc6 DK |
187 | } |
188 | ||
cd1aac32 AK |
189 | /* |
190 | * write the filemap data using writepage() address_space_operations. | |
191 | * We don't do block allocation here even for delalloc. We don't | |
192 | * use writepages() because with dealyed allocation we may be doing | |
193 | * block allocation in writepages(). | |
194 | */ | |
195 | static int journal_submit_inode_data_buffers(struct address_space *mapping) | |
196 | { | |
197 | int ret; | |
198 | struct writeback_control wbc = { | |
199 | .sync_mode = WB_SYNC_ALL, | |
200 | .nr_to_write = mapping->nrpages * 2, | |
201 | .range_start = 0, | |
202 | .range_end = i_size_read(mapping->host), | |
cd1aac32 AK |
203 | }; |
204 | ||
205 | ret = generic_writepages(mapping, &wbc); | |
206 | return ret; | |
207 | } | |
208 | ||
c851ed54 JK |
209 | /* |
210 | * Submit all the data buffers of inode associated with the transaction to | |
211 | * disk. | |
212 | * | |
213 | * We are in a committing transaction. Therefore no new inode can be added to | |
214 | * our inode list. We use JI_COMMIT_RUNNING flag to protect inode we currently | |
215 | * operate on from being released while we write out pages. | |
216 | */ | |
cd1aac32 | 217 | static int journal_submit_data_buffers(journal_t *journal, |
c851ed54 JK |
218 | transaction_t *commit_transaction) |
219 | { | |
220 | struct jbd2_inode *jinode; | |
221 | int err, ret = 0; | |
222 | struct address_space *mapping; | |
223 | ||
224 | spin_lock(&journal->j_list_lock); | |
225 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { | |
226 | mapping = jinode->i_vfs_inode->i_mapping; | |
39e3ac25 | 227 | set_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
c851ed54 | 228 | spin_unlock(&journal->j_list_lock); |
cd1aac32 AK |
229 | /* |
230 | * submit the inode data buffers. We use writepage | |
231 | * instead of writepages. Because writepages can do | |
232 | * block allocation with delalloc. We need to write | |
233 | * only allocated blocks here. | |
234 | */ | |
879c5e6b | 235 | trace_jbd2_submit_inode_data(jinode->i_vfs_inode); |
cd1aac32 | 236 | err = journal_submit_inode_data_buffers(mapping); |
c851ed54 JK |
237 | if (!ret) |
238 | ret = err; | |
239 | spin_lock(&journal->j_list_lock); | |
240 | J_ASSERT(jinode->i_transaction == commit_transaction); | |
39e3ac25 | 241 | clear_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
4e857c58 | 242 | smp_mb__after_atomic(); |
c851ed54 JK |
243 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); |
244 | } | |
245 | spin_unlock(&journal->j_list_lock); | |
246 | return ret; | |
247 | } | |
248 | ||
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) { | |
39e3ac25 | 263 | set_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
c851ed54 JK |
264 | spin_unlock(&journal->j_list_lock); |
265 | err = filemap_fdatawait(jinode->i_vfs_inode->i_mapping); | |
e9e34f4e HK |
266 | if (err) { |
267 | /* | |
268 | * Because AS_EIO is cleared by | |
94004ed7 | 269 | * filemap_fdatawait_range(), set it again so |
e9e34f4e HK |
270 | * that user process can get -EIO from fsync(). |
271 | */ | |
272 | set_bit(AS_EIO, | |
273 | &jinode->i_vfs_inode->i_mapping->flags); | |
274 | ||
275 | if (!ret) | |
276 | ret = err; | |
277 | } | |
c851ed54 | 278 | spin_lock(&journal->j_list_lock); |
39e3ac25 | 279 | clear_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
4e857c58 | 280 | smp_mb__after_atomic(); |
c851ed54 JK |
281 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); |
282 | } | |
283 | ||
284 | /* Now refile inode to proper lists */ | |
285 | list_for_each_entry_safe(jinode, next_i, | |
286 | &commit_transaction->t_inode_list, i_list) { | |
287 | list_del(&jinode->i_list); | |
288 | if (jinode->i_next_transaction) { | |
289 | jinode->i_transaction = jinode->i_next_transaction; | |
290 | jinode->i_next_transaction = NULL; | |
291 | list_add(&jinode->i_list, | |
292 | &jinode->i_transaction->t_inode_list); | |
293 | } else { | |
294 | jinode->i_transaction = NULL; | |
295 | } | |
296 | } | |
297 | spin_unlock(&journal->j_list_lock); | |
298 | ||
299 | return ret; | |
300 | } | |
301 | ||
818d276c GS |
302 | static __u32 jbd2_checksum_data(__u32 crc32_sum, struct buffer_head *bh) |
303 | { | |
304 | struct page *page = bh->b_page; | |
305 | char *addr; | |
306 | __u32 checksum; | |
307 | ||
303a8f2a | 308 | addr = kmap_atomic(page); |
818d276c GS |
309 | checksum = crc32_be(crc32_sum, |
310 | (void *)(addr + offset_in_page(bh->b_data)), bh->b_size); | |
303a8f2a | 311 | kunmap_atomic(addr); |
818d276c GS |
312 | |
313 | return checksum; | |
314 | } | |
315 | ||
db9ee220 | 316 | static void write_tag_block(journal_t *j, journal_block_tag_t *tag, |
18eba7aa | 317 | unsigned long long block) |
b517bea1 ZB |
318 | { |
319 | tag->t_blocknr = cpu_to_be32(block & (u32)~0); | |
db9ee220 | 320 | if (JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_64BIT)) |
b517bea1 ZB |
321 | tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1); |
322 | } | |
323 | ||
3caa487f | 324 | static void jbd2_descr_block_csum_set(journal_t *j, |
e5a120ae | 325 | struct buffer_head *bh) |
3caa487f DW |
326 | { |
327 | struct jbd2_journal_block_tail *tail; | |
328 | __u32 csum; | |
329 | ||
db9ee220 | 330 | if (!jbd2_journal_has_csum_v2or3(j)) |
3caa487f DW |
331 | return; |
332 | ||
e5a120ae | 333 | tail = (struct jbd2_journal_block_tail *)(bh->b_data + j->j_blocksize - |
3caa487f DW |
334 | sizeof(struct jbd2_journal_block_tail)); |
335 | tail->t_checksum = 0; | |
e5a120ae | 336 | csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize); |
3caa487f DW |
337 | tail->t_checksum = cpu_to_be32(csum); |
338 | } | |
339 | ||
c3900875 DW |
340 | static void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag, |
341 | struct buffer_head *bh, __u32 sequence) | |
342 | { | |
db9ee220 | 343 | journal_block_tag3_t *tag3 = (journal_block_tag3_t *)tag; |
c3900875 DW |
344 | struct page *page = bh->b_page; |
345 | __u8 *addr; | |
eee06c56 | 346 | __u32 csum32; |
18a6ea1e | 347 | __be32 seq; |
c3900875 | 348 | |
db9ee220 | 349 | if (!jbd2_journal_has_csum_v2or3(j)) |
c3900875 DW |
350 | return; |
351 | ||
18a6ea1e | 352 | seq = cpu_to_be32(sequence); |
906adea1 | 353 | addr = kmap_atomic(page); |
18a6ea1e | 354 | csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&seq, sizeof(seq)); |
eee06c56 DW |
355 | csum32 = jbd2_chksum(j, csum32, addr + offset_in_page(bh->b_data), |
356 | bh->b_size); | |
906adea1 | 357 | kunmap_atomic(addr); |
c3900875 | 358 | |
db9ee220 DW |
359 | if (JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V3)) |
360 | tag3->t_checksum = cpu_to_be32(csum32); | |
361 | else | |
362 | tag->t_checksum = cpu_to_be16(csum32); | |
c3900875 | 363 | } |
470decc6 | 364 | /* |
f7f4bccb | 365 | * jbd2_journal_commit_transaction |
470decc6 DK |
366 | * |
367 | * The primary function for committing a transaction to the log. This | |
368 | * function is called by the journal thread to begin a complete commit. | |
369 | */ | |
f7f4bccb | 370 | void jbd2_journal_commit_transaction(journal_t *journal) |
470decc6 | 371 | { |
8e85fb3f | 372 | struct transaction_stats_s stats; |
470decc6 | 373 | transaction_t *commit_transaction; |
e5a120ae JK |
374 | struct journal_head *jh; |
375 | struct buffer_head *descriptor; | |
470decc6 DK |
376 | struct buffer_head **wbuf = journal->j_wbuf; |
377 | int bufs; | |
378 | int flags; | |
379 | int err; | |
18eba7aa | 380 | unsigned long long blocknr; |
e07f7183 JB |
381 | ktime_t start_time; |
382 | u64 commit_time; | |
470decc6 DK |
383 | char *tagp = NULL; |
384 | journal_header_t *header; | |
385 | journal_block_tag_t *tag = NULL; | |
386 | int space_left = 0; | |
387 | int first_tag = 0; | |
388 | int tag_flag; | |
794446c6 | 389 | int i; |
b517bea1 | 390 | int tag_bytes = journal_tag_bytes(journal); |
818d276c GS |
391 | struct buffer_head *cbh = NULL; /* For transactional checksums */ |
392 | __u32 crc32_sum = ~0; | |
82f04ab4 | 393 | struct blk_plug plug; |
3339578f JK |
394 | /* Tail of the journal */ |
395 | unsigned long first_block; | |
396 | tid_t first_tid; | |
397 | int update_tail; | |
3caa487f | 398 | int csum_size = 0; |
f5113eff | 399 | LIST_HEAD(io_bufs); |
e5a120ae | 400 | LIST_HEAD(log_bufs); |
3caa487f | 401 | |
db9ee220 | 402 | if (jbd2_journal_has_csum_v2or3(journal)) |
3caa487f | 403 | csum_size = sizeof(struct jbd2_journal_block_tail); |
470decc6 DK |
404 | |
405 | /* | |
406 | * First job: lock down the current transaction and wait for | |
407 | * all outstanding updates to complete. | |
408 | */ | |
409 | ||
f7f4bccb MC |
410 | /* Do we need to erase the effects of a prior jbd2_journal_flush? */ |
411 | if (journal->j_flags & JBD2_FLUSHED) { | |
470decc6 | 412 | jbd_debug(3, "super block updated\n"); |
a78bb11d | 413 | mutex_lock(&journal->j_checkpoint_mutex); |
79feb521 JK |
414 | /* |
415 | * We hold j_checkpoint_mutex so tail cannot change under us. | |
416 | * We don't need any special data guarantees for writing sb | |
417 | * since journal is empty and it is ok for write to be | |
418 | * flushed only with transaction commit. | |
419 | */ | |
420 | jbd2_journal_update_sb_log_tail(journal, | |
421 | journal->j_tail_sequence, | |
422 | journal->j_tail, | |
423 | WRITE_SYNC); | |
a78bb11d | 424 | mutex_unlock(&journal->j_checkpoint_mutex); |
470decc6 DK |
425 | } else { |
426 | jbd_debug(3, "superblock not updated\n"); | |
427 | } | |
428 | ||
429 | J_ASSERT(journal->j_running_transaction != NULL); | |
430 | J_ASSERT(journal->j_committing_transaction == NULL); | |
431 | ||
432 | commit_transaction = journal->j_running_transaction; | |
470decc6 | 433 | |
879c5e6b | 434 | trace_jbd2_start_commit(journal, commit_transaction); |
f2a44523 | 435 | jbd_debug(1, "JBD2: starting commit of transaction %d\n", |
470decc6 DK |
436 | commit_transaction->t_tid); |
437 | ||
a931da6a | 438 | write_lock(&journal->j_state_lock); |
3ca841c1 | 439 | J_ASSERT(commit_transaction->t_state == T_RUNNING); |
470decc6 DK |
440 | commit_transaction->t_state = T_LOCKED; |
441 | ||
879c5e6b | 442 | trace_jbd2_commit_locking(journal, commit_transaction); |
bf699327 | 443 | stats.run.rs_wait = commit_transaction->t_max_wait; |
9fff24aa | 444 | stats.run.rs_request_delay = 0; |
bf699327 | 445 | stats.run.rs_locked = jiffies; |
9fff24aa TT |
446 | if (commit_transaction->t_requested) |
447 | stats.run.rs_request_delay = | |
448 | jbd2_time_diff(commit_transaction->t_requested, | |
449 | stats.run.rs_locked); | |
bf699327 TT |
450 | stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start, |
451 | stats.run.rs_locked); | |
8e85fb3f | 452 | |
470decc6 | 453 | spin_lock(&commit_transaction->t_handle_lock); |
a51dca9c | 454 | while (atomic_read(&commit_transaction->t_updates)) { |
470decc6 DK |
455 | DEFINE_WAIT(wait); |
456 | ||
457 | prepare_to_wait(&journal->j_wait_updates, &wait, | |
458 | TASK_UNINTERRUPTIBLE); | |
a51dca9c | 459 | if (atomic_read(&commit_transaction->t_updates)) { |
470decc6 | 460 | spin_unlock(&commit_transaction->t_handle_lock); |
a931da6a | 461 | write_unlock(&journal->j_state_lock); |
470decc6 | 462 | schedule(); |
a931da6a | 463 | write_lock(&journal->j_state_lock); |
470decc6 DK |
464 | spin_lock(&commit_transaction->t_handle_lock); |
465 | } | |
466 | finish_wait(&journal->j_wait_updates, &wait); | |
467 | } | |
468 | spin_unlock(&commit_transaction->t_handle_lock); | |
469 | ||
a51dca9c | 470 | J_ASSERT (atomic_read(&commit_transaction->t_outstanding_credits) <= |
470decc6 DK |
471 | journal->j_max_transaction_buffers); |
472 | ||
473 | /* | |
474 | * First thing we are allowed to do is to discard any remaining | |
475 | * BJ_Reserved buffers. Note, it is _not_ permissible to assume | |
476 | * that there are no such buffers: if a large filesystem | |
477 | * operation like a truncate needs to split itself over multiple | |
f7f4bccb | 478 | * transactions, then it may try to do a jbd2_journal_restart() while |
470decc6 DK |
479 | * there are still BJ_Reserved buffers outstanding. These must |
480 | * be released cleanly from the current transaction. | |
481 | * | |
482 | * In this case, the filesystem must still reserve write access | |
483 | * again before modifying the buffer in the new transaction, but | |
484 | * we do not require it to remember exactly which old buffers it | |
485 | * has reserved. This is consistent with the existing behaviour | |
f7f4bccb | 486 | * that multiple jbd2_journal_get_write_access() calls to the same |
25985edc | 487 | * buffer are perfectly permissible. |
470decc6 DK |
488 | */ |
489 | while (commit_transaction->t_reserved_list) { | |
490 | jh = commit_transaction->t_reserved_list; | |
491 | JBUFFER_TRACE(jh, "reserved, unused: refile"); | |
492 | /* | |
f7f4bccb | 493 | * A jbd2_journal_get_undo_access()+jbd2_journal_release_buffer() may |
470decc6 DK |
494 | * leave undo-committed data. |
495 | */ | |
496 | if (jh->b_committed_data) { | |
497 | struct buffer_head *bh = jh2bh(jh); | |
498 | ||
499 | jbd_lock_bh_state(bh); | |
af1e76d6 | 500 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
501 | jh->b_committed_data = NULL; |
502 | jbd_unlock_bh_state(bh); | |
503 | } | |
f7f4bccb | 504 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
505 | } |
506 | ||
507 | /* | |
508 | * Now try to drop any written-back buffers from the journal's | |
509 | * checkpoint lists. We do this *before* commit because it potentially | |
510 | * frees some memory | |
511 | */ | |
512 | spin_lock(&journal->j_list_lock); | |
841df7df | 513 | __jbd2_journal_clean_checkpoint_list(journal, false); |
470decc6 DK |
514 | spin_unlock(&journal->j_list_lock); |
515 | ||
f2a44523 | 516 | jbd_debug(3, "JBD2: commit phase 1\n"); |
470decc6 | 517 | |
1ba37268 YY |
518 | /* |
519 | * Clear revoked flag to reflect there is no revoked buffers | |
520 | * in the next transaction which is going to be started. | |
521 | */ | |
522 | jbd2_clear_buffer_revoked_flags(journal); | |
523 | ||
470decc6 DK |
524 | /* |
525 | * Switch to a new revoke table. | |
526 | */ | |
f7f4bccb | 527 | jbd2_journal_switch_revoke_table(journal); |
470decc6 | 528 | |
8f7d89f3 JK |
529 | /* |
530 | * Reserved credits cannot be claimed anymore, free them | |
531 | */ | |
532 | atomic_sub(atomic_read(&journal->j_reserved_credits), | |
533 | &commit_transaction->t_outstanding_credits); | |
534 | ||
879c5e6b | 535 | trace_jbd2_commit_flushing(journal, commit_transaction); |
bf699327 TT |
536 | stats.run.rs_flushing = jiffies; |
537 | stats.run.rs_locked = jbd2_time_diff(stats.run.rs_locked, | |
538 | stats.run.rs_flushing); | |
8e85fb3f | 539 | |
470decc6 DK |
540 | commit_transaction->t_state = T_FLUSH; |
541 | journal->j_committing_transaction = commit_transaction; | |
542 | journal->j_running_transaction = NULL; | |
e07f7183 | 543 | start_time = ktime_get(); |
470decc6 DK |
544 | commit_transaction->t_log_start = journal->j_head; |
545 | wake_up(&journal->j_wait_transaction_locked); | |
a931da6a | 546 | write_unlock(&journal->j_state_lock); |
470decc6 | 547 | |
cfc7bc89 | 548 | jbd_debug(3, "JBD2: commit phase 2a\n"); |
470decc6 | 549 | |
470decc6 DK |
550 | /* |
551 | * Now start flushing things to disk, in the order they appear | |
552 | * on the transaction lists. Data blocks go first. | |
553 | */ | |
cd1aac32 | 554 | err = journal_submit_data_buffers(journal, commit_transaction); |
470decc6 | 555 | if (err) |
a7fa2baf | 556 | jbd2_journal_abort(journal, err); |
470decc6 | 557 | |
82f04ab4 | 558 | blk_start_plug(&plug); |
67c457a8 | 559 | jbd2_journal_write_revoke_records(journal, commit_transaction, |
e5a120ae | 560 | &log_bufs, WRITE_SYNC); |
470decc6 | 561 | |
cfc7bc89 | 562 | jbd_debug(3, "JBD2: commit phase 2b\n"); |
470decc6 | 563 | |
470decc6 DK |
564 | /* |
565 | * Way to go: we have now written out all of the data for a | |
566 | * transaction! Now comes the tricky part: we need to write out | |
567 | * metadata. Loop over the transaction's entire buffer list: | |
568 | */ | |
a931da6a | 569 | write_lock(&journal->j_state_lock); |
470decc6 | 570 | commit_transaction->t_state = T_COMMIT; |
a931da6a | 571 | write_unlock(&journal->j_state_lock); |
470decc6 | 572 | |
879c5e6b | 573 | trace_jbd2_commit_logging(journal, commit_transaction); |
bf699327 TT |
574 | stats.run.rs_logging = jiffies; |
575 | stats.run.rs_flushing = jbd2_time_diff(stats.run.rs_flushing, | |
576 | stats.run.rs_logging); | |
a51dca9c TT |
577 | stats.run.rs_blocks = |
578 | atomic_read(&commit_transaction->t_outstanding_credits); | |
bf699327 | 579 | stats.run.rs_blocks_logged = 0; |
8e85fb3f | 580 | |
1dfc3220 | 581 | J_ASSERT(commit_transaction->t_nr_buffers <= |
a51dca9c | 582 | atomic_read(&commit_transaction->t_outstanding_credits)); |
1dfc3220 | 583 | |
87c89c23 | 584 | err = 0; |
470decc6 | 585 | bufs = 0; |
e5a120ae | 586 | descriptor = NULL; |
470decc6 DK |
587 | while (commit_transaction->t_buffers) { |
588 | ||
589 | /* Find the next buffer to be journaled... */ | |
590 | ||
591 | jh = commit_transaction->t_buffers; | |
592 | ||
593 | /* If we're in abort mode, we just un-journal the buffer and | |
7ad7445f | 594 | release it. */ |
470decc6 DK |
595 | |
596 | if (is_journal_aborted(journal)) { | |
7ad7445f | 597 | clear_buffer_jbddirty(jh2bh(jh)); |
470decc6 | 598 | JBUFFER_TRACE(jh, "journal is aborting: refile"); |
e06c8227 JB |
599 | jbd2_buffer_abort_trigger(jh, |
600 | jh->b_frozen_data ? | |
601 | jh->b_frozen_triggers : | |
602 | jh->b_triggers); | |
f7f4bccb | 603 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
604 | /* If that was the last one, we need to clean up |
605 | * any descriptor buffers which may have been | |
606 | * already allocated, even if we are now | |
607 | * aborting. */ | |
608 | if (!commit_transaction->t_buffers) | |
609 | goto start_journal_io; | |
610 | continue; | |
611 | } | |
612 | ||
613 | /* Make sure we have a descriptor block in which to | |
614 | record the metadata buffer. */ | |
615 | ||
616 | if (!descriptor) { | |
470decc6 DK |
617 | J_ASSERT (bufs == 0); |
618 | ||
f2a44523 | 619 | jbd_debug(4, "JBD2: get descriptor\n"); |
470decc6 | 620 | |
f7f4bccb | 621 | descriptor = jbd2_journal_get_descriptor_buffer(journal); |
470decc6 | 622 | if (!descriptor) { |
a7fa2baf | 623 | jbd2_journal_abort(journal, -EIO); |
470decc6 DK |
624 | continue; |
625 | } | |
626 | ||
f2a44523 | 627 | jbd_debug(4, "JBD2: got buffer %llu (%p)\n", |
e5a120ae JK |
628 | (unsigned long long)descriptor->b_blocknr, |
629 | descriptor->b_data); | |
630 | header = (journal_header_t *)descriptor->b_data; | |
f7f4bccb MC |
631 | header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); |
632 | header->h_blocktype = cpu_to_be32(JBD2_DESCRIPTOR_BLOCK); | |
470decc6 DK |
633 | header->h_sequence = cpu_to_be32(commit_transaction->t_tid); |
634 | ||
e5a120ae JK |
635 | tagp = &descriptor->b_data[sizeof(journal_header_t)]; |
636 | space_left = descriptor->b_size - | |
637 | sizeof(journal_header_t); | |
470decc6 | 638 | first_tag = 1; |
e5a120ae JK |
639 | set_buffer_jwrite(descriptor); |
640 | set_buffer_dirty(descriptor); | |
641 | wbuf[bufs++] = descriptor; | |
470decc6 DK |
642 | |
643 | /* Record it so that we can wait for IO | |
644 | completion later */ | |
e5a120ae JK |
645 | BUFFER_TRACE(descriptor, "ph3: file as descriptor"); |
646 | jbd2_file_log_bh(&log_bufs, descriptor); | |
470decc6 DK |
647 | } |
648 | ||
649 | /* Where is the buffer to be written? */ | |
650 | ||
f7f4bccb | 651 | err = jbd2_journal_next_log_block(journal, &blocknr); |
470decc6 DK |
652 | /* If the block mapping failed, just abandon the buffer |
653 | and repeat this loop: we'll fall into the | |
654 | refile-on-abort condition above. */ | |
655 | if (err) { | |
a7fa2baf | 656 | jbd2_journal_abort(journal, err); |
470decc6 DK |
657 | continue; |
658 | } | |
659 | ||
660 | /* | |
661 | * start_this_handle() uses t_outstanding_credits to determine | |
662 | * the free space in the log, but this counter is changed | |
f7f4bccb | 663 | * by jbd2_journal_next_log_block() also. |
470decc6 | 664 | */ |
a51dca9c | 665 | atomic_dec(&commit_transaction->t_outstanding_credits); |
470decc6 DK |
666 | |
667 | /* Bump b_count to prevent truncate from stumbling over | |
668 | the shadowed buffer! @@@ This can go if we ever get | |
f5113eff | 669 | rid of the shadow pairing of buffers. */ |
470decc6 DK |
670 | atomic_inc(&jh2bh(jh)->b_count); |
671 | ||
470decc6 | 672 | /* |
f5113eff JK |
673 | * Make a temporary IO buffer with which to write it out |
674 | * (this will requeue the metadata buffer to BJ_Shadow). | |
470decc6 | 675 | */ |
f5113eff | 676 | set_bit(BH_JWrite, &jh2bh(jh)->b_state); |
470decc6 | 677 | JBUFFER_TRACE(jh, "ph3: write metadata"); |
f7f4bccb | 678 | flags = jbd2_journal_write_metadata_buffer(commit_transaction, |
f5113eff | 679 | jh, &wbuf[bufs], blocknr); |
e6ec116b TT |
680 | if (flags < 0) { |
681 | jbd2_journal_abort(journal, flags); | |
682 | continue; | |
683 | } | |
f5113eff | 684 | jbd2_file_log_bh(&io_bufs, wbuf[bufs]); |
470decc6 DK |
685 | |
686 | /* Record the new block's tag in the current descriptor | |
687 | buffer */ | |
688 | ||
689 | tag_flag = 0; | |
690 | if (flags & 1) | |
f7f4bccb | 691 | tag_flag |= JBD2_FLAG_ESCAPE; |
470decc6 | 692 | if (!first_tag) |
f7f4bccb | 693 | tag_flag |= JBD2_FLAG_SAME_UUID; |
470decc6 DK |
694 | |
695 | tag = (journal_block_tag_t *) tagp; | |
db9ee220 | 696 | write_tag_block(journal, tag, jh2bh(jh)->b_blocknr); |
8f888ef8 | 697 | tag->t_flags = cpu_to_be16(tag_flag); |
f5113eff | 698 | jbd2_block_tag_csum_set(journal, tag, wbuf[bufs], |
c3900875 | 699 | commit_transaction->t_tid); |
b517bea1 ZB |
700 | tagp += tag_bytes; |
701 | space_left -= tag_bytes; | |
f5113eff | 702 | bufs++; |
470decc6 DK |
703 | |
704 | if (first_tag) { | |
705 | memcpy (tagp, journal->j_uuid, 16); | |
706 | tagp += 16; | |
707 | space_left -= 16; | |
708 | first_tag = 0; | |
709 | } | |
710 | ||
711 | /* If there's no more to do, or if the descriptor is full, | |
712 | let the IO rip! */ | |
713 | ||
714 | if (bufs == journal->j_wbufsize || | |
715 | commit_transaction->t_buffers == NULL || | |
3caa487f | 716 | space_left < tag_bytes + 16 + csum_size) { |
470decc6 | 717 | |
f2a44523 | 718 | jbd_debug(4, "JBD2: Submit %d IOs\n", bufs); |
470decc6 DK |
719 | |
720 | /* Write an end-of-descriptor marker before | |
721 | submitting the IOs. "tag" still points to | |
722 | the last tag we set up. */ | |
723 | ||
8f888ef8 | 724 | tag->t_flags |= cpu_to_be16(JBD2_FLAG_LAST_TAG); |
470decc6 | 725 | |
3caa487f | 726 | jbd2_descr_block_csum_set(journal, descriptor); |
470decc6 DK |
727 | start_journal_io: |
728 | for (i = 0; i < bufs; i++) { | |
729 | struct buffer_head *bh = wbuf[i]; | |
818d276c GS |
730 | /* |
731 | * Compute checksum. | |
732 | */ | |
733 | if (JBD2_HAS_COMPAT_FEATURE(journal, | |
734 | JBD2_FEATURE_COMPAT_CHECKSUM)) { | |
735 | crc32_sum = | |
736 | jbd2_checksum_data(crc32_sum, bh); | |
737 | } | |
738 | ||
470decc6 DK |
739 | lock_buffer(bh); |
740 | clear_buffer_dirty(bh); | |
741 | set_buffer_uptodate(bh); | |
742 | bh->b_end_io = journal_end_buffer_io_sync; | |
82f04ab4 | 743 | submit_bh(WRITE_SYNC, bh); |
470decc6 DK |
744 | } |
745 | cond_resched(); | |
bf699327 | 746 | stats.run.rs_blocks_logged += bufs; |
470decc6 DK |
747 | |
748 | /* Force a new descriptor to be generated next | |
749 | time round the loop. */ | |
750 | descriptor = NULL; | |
751 | bufs = 0; | |
752 | } | |
753 | } | |
754 | ||
f73bee49 JK |
755 | err = journal_finish_inode_data_buffers(journal, commit_transaction); |
756 | if (err) { | |
757 | printk(KERN_WARNING | |
758 | "JBD2: Detected IO errors while flushing file data " | |
759 | "on %s\n", journal->j_devname); | |
760 | if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR) | |
761 | jbd2_journal_abort(journal, err); | |
762 | err = 0; | |
763 | } | |
764 | ||
3339578f JK |
765 | /* |
766 | * Get current oldest transaction in the log before we issue flush | |
767 | * to the filesystem device. After the flush we can be sure that | |
768 | * blocks of all older transactions are checkpointed to persistent | |
769 | * storage and we will be safe to update journal start in the | |
770 | * superblock with the numbers we get here. | |
771 | */ | |
772 | update_tail = | |
773 | jbd2_journal_get_log_tail(journal, &first_tid, &first_block); | |
774 | ||
bbd2be36 | 775 | write_lock(&journal->j_state_lock); |
3339578f JK |
776 | if (update_tail) { |
777 | long freed = first_block - journal->j_tail; | |
778 | ||
779 | if (first_block < journal->j_tail) | |
780 | freed += journal->j_last - journal->j_first; | |
781 | /* Update tail only if we free significant amount of space */ | |
782 | if (freed < journal->j_maxlen / 4) | |
783 | update_tail = 0; | |
784 | } | |
bbd2be36 JK |
785 | J_ASSERT(commit_transaction->t_state == T_COMMIT); |
786 | commit_transaction->t_state = T_COMMIT_DFLUSH; | |
787 | write_unlock(&journal->j_state_lock); | |
3339578f | 788 | |
cc3e1bea TT |
789 | /* |
790 | * If the journal is not located on the file system device, | |
791 | * then we must flush the file system device before we issue | |
792 | * the commit record | |
793 | */ | |
81be12c8 | 794 | if (commit_transaction->t_need_data_flush && |
cc3e1bea TT |
795 | (journal->j_fs_dev != journal->j_dev) && |
796 | (journal->j_flags & JBD2_BARRIER)) | |
99aa7846 | 797 | blkdev_issue_flush(journal->j_fs_dev, GFP_NOFS, NULL); |
818d276c | 798 | |
cc3e1bea | 799 | /* Done it all: now write the commit record asynchronously. */ |
818d276c | 800 | if (JBD2_HAS_INCOMPAT_FEATURE(journal, |
0e3d2a63 | 801 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { |
818d276c GS |
802 | err = journal_submit_commit_record(journal, commit_transaction, |
803 | &cbh, crc32_sum); | |
804 | if (err) | |
805 | __jbd2_journal_abort_hard(journal); | |
e9e34f4e | 806 | } |
c851ed54 | 807 | |
82f04ab4 JA |
808 | blk_finish_plug(&plug); |
809 | ||
470decc6 DK |
810 | /* Lo and behold: we have just managed to send a transaction to |
811 | the log. Before we can commit it, wait for the IO so far to | |
812 | complete. Control buffers being written are on the | |
813 | transaction's t_log_list queue, and metadata buffers are on | |
f5113eff | 814 | the io_bufs list. |
470decc6 DK |
815 | |
816 | Wait for the buffers in reverse order. That way we are | |
817 | less likely to be woken up until all IOs have completed, and | |
818 | so we incur less scheduling load. | |
819 | */ | |
820 | ||
f2a44523 | 821 | jbd_debug(3, "JBD2: commit phase 3\n"); |
470decc6 | 822 | |
f5113eff JK |
823 | while (!list_empty(&io_bufs)) { |
824 | struct buffer_head *bh = list_entry(io_bufs.prev, | |
825 | struct buffer_head, | |
826 | b_assoc_buffers); | |
470decc6 | 827 | |
f5113eff JK |
828 | wait_on_buffer(bh); |
829 | cond_resched(); | |
470decc6 DK |
830 | |
831 | if (unlikely(!buffer_uptodate(bh))) | |
832 | err = -EIO; | |
f5113eff | 833 | jbd2_unfile_log_bh(bh); |
470decc6 DK |
834 | |
835 | /* | |
f5113eff JK |
836 | * The list contains temporary buffer heads created by |
837 | * jbd2_journal_write_metadata_buffer(). | |
470decc6 DK |
838 | */ |
839 | BUFFER_TRACE(bh, "dumping temporary bh"); | |
470decc6 DK |
840 | __brelse(bh); |
841 | J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0); | |
842 | free_buffer_head(bh); | |
843 | ||
f5113eff | 844 | /* We also have to refile the corresponding shadowed buffer */ |
470decc6 DK |
845 | jh = commit_transaction->t_shadow_list->b_tprev; |
846 | bh = jh2bh(jh); | |
f5113eff | 847 | clear_buffer_jwrite(bh); |
470decc6 | 848 | J_ASSERT_BH(bh, buffer_jbddirty(bh)); |
b34090e5 | 849 | J_ASSERT_BH(bh, !buffer_shadow(bh)); |
470decc6 DK |
850 | |
851 | /* The metadata is now released for reuse, but we need | |
852 | to remember it against this transaction so that when | |
853 | we finally commit, we can do any checkpointing | |
854 | required. */ | |
855 | JBUFFER_TRACE(jh, "file as BJ_Forget"); | |
f7f4bccb | 856 | jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget); |
470decc6 DK |
857 | JBUFFER_TRACE(jh, "brelse shadowed buffer"); |
858 | __brelse(bh); | |
859 | } | |
860 | ||
861 | J_ASSERT (commit_transaction->t_shadow_list == NULL); | |
862 | ||
f2a44523 | 863 | jbd_debug(3, "JBD2: commit phase 4\n"); |
470decc6 DK |
864 | |
865 | /* Here we wait for the revoke record and descriptor record buffers */ | |
e5a120ae | 866 | while (!list_empty(&log_bufs)) { |
470decc6 DK |
867 | struct buffer_head *bh; |
868 | ||
e5a120ae JK |
869 | bh = list_entry(log_bufs.prev, struct buffer_head, b_assoc_buffers); |
870 | wait_on_buffer(bh); | |
871 | cond_resched(); | |
470decc6 DK |
872 | |
873 | if (unlikely(!buffer_uptodate(bh))) | |
874 | err = -EIO; | |
875 | ||
876 | BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile"); | |
877 | clear_buffer_jwrite(bh); | |
e5a120ae | 878 | jbd2_unfile_log_bh(bh); |
470decc6 DK |
879 | __brelse(bh); /* One for getblk */ |
880 | /* AKPM: bforget here */ | |
881 | } | |
882 | ||
77e841de HK |
883 | if (err) |
884 | jbd2_journal_abort(journal, err); | |
885 | ||
f2a44523 | 886 | jbd_debug(3, "JBD2: commit phase 5\n"); |
bbd2be36 JK |
887 | write_lock(&journal->j_state_lock); |
888 | J_ASSERT(commit_transaction->t_state == T_COMMIT_DFLUSH); | |
889 | commit_transaction->t_state = T_COMMIT_JFLUSH; | |
890 | write_unlock(&journal->j_state_lock); | |
470decc6 | 891 | |
818d276c | 892 | if (!JBD2_HAS_INCOMPAT_FEATURE(journal, |
0e3d2a63 | 893 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { |
818d276c GS |
894 | err = journal_submit_commit_record(journal, commit_transaction, |
895 | &cbh, crc32_sum); | |
896 | if (err) | |
897 | __jbd2_journal_abort_hard(journal); | |
898 | } | |
6cba611e | 899 | if (cbh) |
fd98496f | 900 | err = journal_wait_on_commit_record(journal, cbh); |
f73bee49 JK |
901 | if (JBD2_HAS_INCOMPAT_FEATURE(journal, |
902 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT) && | |
903 | journal->j_flags & JBD2_BARRIER) { | |
99aa7846 | 904 | blkdev_issue_flush(journal->j_dev, GFP_NOFS, NULL); |
f73bee49 | 905 | } |
470decc6 DK |
906 | |
907 | if (err) | |
a7fa2baf | 908 | jbd2_journal_abort(journal, err); |
470decc6 | 909 | |
3339578f JK |
910 | /* |
911 | * Now disk caches for filesystem device are flushed so we are safe to | |
912 | * erase checkpointed transactions from the log by updating journal | |
913 | * superblock. | |
914 | */ | |
915 | if (update_tail) | |
916 | jbd2_update_log_tail(journal, first_tid, first_block); | |
917 | ||
470decc6 DK |
918 | /* End of a transaction! Finally, we can do checkpoint |
919 | processing: any buffers committed as a result of this | |
920 | transaction can be removed from any checkpoint list it was on | |
921 | before. */ | |
922 | ||
f2a44523 | 923 | jbd_debug(3, "JBD2: commit phase 6\n"); |
470decc6 | 924 | |
c851ed54 | 925 | J_ASSERT(list_empty(&commit_transaction->t_inode_list)); |
470decc6 DK |
926 | J_ASSERT(commit_transaction->t_buffers == NULL); |
927 | J_ASSERT(commit_transaction->t_checkpoint_list == NULL); | |
470decc6 | 928 | J_ASSERT(commit_transaction->t_shadow_list == NULL); |
470decc6 DK |
929 | |
930 | restart_loop: | |
931 | /* | |
932 | * As there are other places (journal_unmap_buffer()) adding buffers | |
933 | * to this list we have to be careful and hold the j_list_lock. | |
934 | */ | |
935 | spin_lock(&journal->j_list_lock); | |
936 | while (commit_transaction->t_forget) { | |
937 | transaction_t *cp_transaction; | |
938 | struct buffer_head *bh; | |
de1b7941 | 939 | int try_to_free = 0; |
470decc6 DK |
940 | |
941 | jh = commit_transaction->t_forget; | |
942 | spin_unlock(&journal->j_list_lock); | |
943 | bh = jh2bh(jh); | |
de1b7941 JK |
944 | /* |
945 | * Get a reference so that bh cannot be freed before we are | |
946 | * done with it. | |
947 | */ | |
948 | get_bh(bh); | |
470decc6 | 949 | jbd_lock_bh_state(bh); |
23e2af35 | 950 | J_ASSERT_JH(jh, jh->b_transaction == commit_transaction); |
470decc6 DK |
951 | |
952 | /* | |
953 | * If there is undo-protected committed data against | |
954 | * this buffer, then we can remove it now. If it is a | |
955 | * buffer needing such protection, the old frozen_data | |
956 | * field now points to a committed version of the | |
957 | * buffer, so rotate that field to the new committed | |
958 | * data. | |
959 | * | |
960 | * Otherwise, we can just throw away the frozen data now. | |
e06c8227 JB |
961 | * |
962 | * We also know that the frozen data has already fired | |
963 | * its triggers if they exist, so we can clear that too. | |
470decc6 DK |
964 | */ |
965 | if (jh->b_committed_data) { | |
af1e76d6 | 966 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
967 | jh->b_committed_data = NULL; |
968 | if (jh->b_frozen_data) { | |
969 | jh->b_committed_data = jh->b_frozen_data; | |
970 | jh->b_frozen_data = NULL; | |
e06c8227 | 971 | jh->b_frozen_triggers = NULL; |
470decc6 DK |
972 | } |
973 | } else if (jh->b_frozen_data) { | |
af1e76d6 | 974 | jbd2_free(jh->b_frozen_data, bh->b_size); |
470decc6 | 975 | jh->b_frozen_data = NULL; |
e06c8227 | 976 | jh->b_frozen_triggers = NULL; |
470decc6 DK |
977 | } |
978 | ||
979 | spin_lock(&journal->j_list_lock); | |
980 | cp_transaction = jh->b_cp_transaction; | |
981 | if (cp_transaction) { | |
982 | JBUFFER_TRACE(jh, "remove from old cp transaction"); | |
8e85fb3f | 983 | cp_transaction->t_chp_stats.cs_dropped++; |
f7f4bccb | 984 | __jbd2_journal_remove_checkpoint(jh); |
470decc6 DK |
985 | } |
986 | ||
987 | /* Only re-checkpoint the buffer_head if it is marked | |
988 | * dirty. If the buffer was added to the BJ_Forget list | |
f7f4bccb | 989 | * by jbd2_journal_forget, it may no longer be dirty and |
470decc6 DK |
990 | * there's no point in keeping a checkpoint record for |
991 | * it. */ | |
992 | ||
b794e7a6 JK |
993 | /* |
994 | * A buffer which has been freed while still being journaled by | |
995 | * a previous transaction. | |
996 | */ | |
997 | if (buffer_freed(bh)) { | |
998 | /* | |
999 | * If the running transaction is the one containing | |
1000 | * "add to orphan" operation (b_next_transaction != | |
1001 | * NULL), we have to wait for that transaction to | |
1002 | * commit before we can really get rid of the buffer. | |
1003 | * So just clear b_modified to not confuse transaction | |
1004 | * credit accounting and refile the buffer to | |
1005 | * BJ_Forget of the running transaction. If the just | |
1006 | * committed transaction contains "add to orphan" | |
1007 | * operation, we can completely invalidate the buffer | |
1008 | * now. We are rather through in that since the | |
1009 | * buffer may be still accessible when blocksize < | |
1010 | * pagesize and it is attached to the last partial | |
1011 | * page. | |
1012 | */ | |
1013 | jh->b_modified = 0; | |
1014 | if (!jh->b_next_transaction) { | |
1015 | clear_buffer_freed(bh); | |
1016 | clear_buffer_jbddirty(bh); | |
1017 | clear_buffer_mapped(bh); | |
1018 | clear_buffer_new(bh); | |
1019 | clear_buffer_req(bh); | |
1020 | bh->b_bdev = NULL; | |
1021 | } | |
470decc6 DK |
1022 | } |
1023 | ||
1024 | if (buffer_jbddirty(bh)) { | |
1025 | JBUFFER_TRACE(jh, "add to new checkpointing trans"); | |
f7f4bccb | 1026 | __jbd2_journal_insert_checkpoint(jh, commit_transaction); |
7ad7445f HK |
1027 | if (is_journal_aborted(journal)) |
1028 | clear_buffer_jbddirty(bh); | |
470decc6 DK |
1029 | } else { |
1030 | J_ASSERT_BH(bh, !buffer_dirty(bh)); | |
de1b7941 JK |
1031 | /* |
1032 | * The buffer on BJ_Forget list and not jbddirty means | |
470decc6 DK |
1033 | * it has been freed by this transaction and hence it |
1034 | * could not have been reallocated until this | |
1035 | * transaction has committed. *BUT* it could be | |
1036 | * reallocated once we have written all the data to | |
1037 | * disk and before we process the buffer on BJ_Forget | |
de1b7941 JK |
1038 | * list. |
1039 | */ | |
1040 | if (!jh->b_next_transaction) | |
1041 | try_to_free = 1; | |
470decc6 | 1042 | } |
de1b7941 JK |
1043 | JBUFFER_TRACE(jh, "refile or unfile buffer"); |
1044 | __jbd2_journal_refile_buffer(jh); | |
1045 | jbd_unlock_bh_state(bh); | |
1046 | if (try_to_free) | |
1047 | release_buffer_page(bh); /* Drops bh reference */ | |
1048 | else | |
1049 | __brelse(bh); | |
470decc6 DK |
1050 | cond_resched_lock(&journal->j_list_lock); |
1051 | } | |
1052 | spin_unlock(&journal->j_list_lock); | |
1053 | /* | |
f5a7a6b0 JK |
1054 | * This is a bit sleazy. We use j_list_lock to protect transition |
1055 | * of a transaction into T_FINISHED state and calling | |
1056 | * __jbd2_journal_drop_transaction(). Otherwise we could race with | |
1057 | * other checkpointing code processing the transaction... | |
470decc6 | 1058 | */ |
a931da6a | 1059 | write_lock(&journal->j_state_lock); |
470decc6 DK |
1060 | spin_lock(&journal->j_list_lock); |
1061 | /* | |
1062 | * Now recheck if some buffers did not get attached to the transaction | |
1063 | * while the lock was dropped... | |
1064 | */ | |
1065 | if (commit_transaction->t_forget) { | |
1066 | spin_unlock(&journal->j_list_lock); | |
a931da6a | 1067 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
1068 | goto restart_loop; |
1069 | } | |
1070 | ||
d4e839d4 TT |
1071 | /* Add the transaction to the checkpoint list |
1072 | * __journal_remove_checkpoint() can not destroy transaction | |
1073 | * under us because it is not marked as T_FINISHED yet */ | |
1074 | if (journal->j_checkpoint_transactions == NULL) { | |
1075 | journal->j_checkpoint_transactions = commit_transaction; | |
1076 | commit_transaction->t_cpnext = commit_transaction; | |
1077 | commit_transaction->t_cpprev = commit_transaction; | |
1078 | } else { | |
1079 | commit_transaction->t_cpnext = | |
1080 | journal->j_checkpoint_transactions; | |
1081 | commit_transaction->t_cpprev = | |
1082 | commit_transaction->t_cpnext->t_cpprev; | |
1083 | commit_transaction->t_cpnext->t_cpprev = | |
1084 | commit_transaction; | |
1085 | commit_transaction->t_cpprev->t_cpnext = | |
1086 | commit_transaction; | |
1087 | } | |
1088 | spin_unlock(&journal->j_list_lock); | |
1089 | ||
470decc6 DK |
1090 | /* Done with this transaction! */ |
1091 | ||
f2a44523 | 1092 | jbd_debug(3, "JBD2: commit phase 7\n"); |
470decc6 | 1093 | |
bbd2be36 | 1094 | J_ASSERT(commit_transaction->t_state == T_COMMIT_JFLUSH); |
470decc6 | 1095 | |
8e85fb3f | 1096 | commit_transaction->t_start = jiffies; |
bf699327 TT |
1097 | stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging, |
1098 | commit_transaction->t_start); | |
8e85fb3f JL |
1099 | |
1100 | /* | |
bf699327 | 1101 | * File the transaction statistics |
8e85fb3f | 1102 | */ |
8e85fb3f | 1103 | stats.ts_tid = commit_transaction->t_tid; |
8dd42046 TT |
1104 | stats.run.rs_handle_count = |
1105 | atomic_read(&commit_transaction->t_handle_count); | |
bf699327 TT |
1106 | trace_jbd2_run_stats(journal->j_fs_dev->bd_dev, |
1107 | commit_transaction->t_tid, &stats.run); | |
42cf3452 | 1108 | stats.ts_requested = (commit_transaction->t_requested) ? 1 : 0; |
8e85fb3f | 1109 | |
794446c6 | 1110 | commit_transaction->t_state = T_COMMIT_CALLBACK; |
470decc6 DK |
1111 | J_ASSERT(commit_transaction == journal->j_committing_transaction); |
1112 | journal->j_commit_sequence = commit_transaction->t_tid; | |
1113 | journal->j_committing_transaction = NULL; | |
e07f7183 | 1114 | commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time)); |
470decc6 | 1115 | |
e07f7183 JB |
1116 | /* |
1117 | * weight the commit time higher than the average time so we don't | |
1118 | * react too strongly to vast changes in the commit time | |
1119 | */ | |
1120 | if (likely(journal->j_average_commit_time)) | |
1121 | journal->j_average_commit_time = (commit_time + | |
1122 | journal->j_average_commit_time*3) / 4; | |
1123 | else | |
1124 | journal->j_average_commit_time = commit_time; | |
794446c6 | 1125 | |
a931da6a | 1126 | write_unlock(&journal->j_state_lock); |
6c20ec85 | 1127 | |
fb68407b AK |
1128 | if (journal->j_commit_callback) |
1129 | journal->j_commit_callback(journal, commit_transaction); | |
1130 | ||
879c5e6b | 1131 | trace_jbd2_end_commit(journal, commit_transaction); |
f2a44523 | 1132 | jbd_debug(1, "JBD2: commit %d complete, head %d\n", |
470decc6 DK |
1133 | journal->j_commit_sequence, journal->j_tail_sequence); |
1134 | ||
794446c6 DM |
1135 | write_lock(&journal->j_state_lock); |
1136 | spin_lock(&journal->j_list_lock); | |
1137 | commit_transaction->t_state = T_FINISHED; | |
d4e839d4 | 1138 | /* Check if the transaction can be dropped now that we are finished */ |
794446c6 DM |
1139 | if (commit_transaction->t_checkpoint_list == NULL && |
1140 | commit_transaction->t_checkpoint_io_list == NULL) { | |
1141 | __jbd2_journal_drop_transaction(journal, commit_transaction); | |
1142 | jbd2_journal_free_transaction(commit_transaction); | |
1143 | } | |
1144 | spin_unlock(&journal->j_list_lock); | |
1145 | write_unlock(&journal->j_state_lock); | |
470decc6 | 1146 | wake_up(&journal->j_wait_done_commit); |
42cf3452 TT |
1147 | |
1148 | /* | |
1149 | * Calculate overall stats | |
1150 | */ | |
1151 | spin_lock(&journal->j_history_lock); | |
1152 | journal->j_stats.ts_tid++; | |
1153 | journal->j_stats.ts_requested += stats.ts_requested; | |
1154 | journal->j_stats.run.rs_wait += stats.run.rs_wait; | |
1155 | journal->j_stats.run.rs_request_delay += stats.run.rs_request_delay; | |
1156 | journal->j_stats.run.rs_running += stats.run.rs_running; | |
1157 | journal->j_stats.run.rs_locked += stats.run.rs_locked; | |
1158 | journal->j_stats.run.rs_flushing += stats.run.rs_flushing; | |
1159 | journal->j_stats.run.rs_logging += stats.run.rs_logging; | |
1160 | journal->j_stats.run.rs_handle_count += stats.run.rs_handle_count; | |
1161 | journal->j_stats.run.rs_blocks += stats.run.rs_blocks; | |
1162 | journal->j_stats.run.rs_blocks_logged += stats.run.rs_blocks_logged; | |
1163 | spin_unlock(&journal->j_history_lock); | |
470decc6 | 1164 | } |