Commit | Line | Data |
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470decc6 | 1 | /* |
f7f4bccb | 2 | * linux/fs/jbd2/journal.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 | * Generic filesystem journal-writing code; part of the ext2fs | |
13 | * journaling system. | |
14 | * | |
15 | * This file manages journals: areas of disk reserved for logging | |
16 | * transactional updates. This includes the kernel journaling thread | |
17 | * which is responsible for scheduling updates to the log. | |
18 | * | |
19 | * We do not actually manage the physical storage of the journal in this | |
20 | * file: that is left to a per-journal policy function, which allows us | |
21 | * to store the journal within a filesystem-specified area for ext2 | |
22 | * journaling (ext2 can use a reserved inode for storing the log). | |
23 | */ | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/time.h> | |
27 | #include <linux/fs.h> | |
f7f4bccb | 28 | #include <linux/jbd2.h> |
470decc6 DK |
29 | #include <linux/errno.h> |
30 | #include <linux/slab.h> | |
470decc6 DK |
31 | #include <linux/init.h> |
32 | #include <linux/mm.h> | |
7dfb7103 | 33 | #include <linux/freezer.h> |
470decc6 DK |
34 | #include <linux/pagemap.h> |
35 | #include <linux/kthread.h> | |
36 | #include <linux/poison.h> | |
37 | #include <linux/proc_fs.h> | |
0f49d5d0 | 38 | #include <linux/debugfs.h> |
8e85fb3f | 39 | #include <linux/seq_file.h> |
c225aa57 | 40 | #include <linux/math64.h> |
879c5e6b | 41 | #include <linux/hash.h> |
d2eecb03 TT |
42 | #include <linux/log2.h> |
43 | #include <linux/vmalloc.h> | |
47def826 | 44 | #include <linux/backing-dev.h> |
39e3ac25 | 45 | #include <linux/bitops.h> |
670be5a7 | 46 | #include <linux/ratelimit.h> |
879c5e6b TT |
47 | |
48 | #define CREATE_TRACE_POINTS | |
49 | #include <trace/events/jbd2.h> | |
470decc6 DK |
50 | |
51 | #include <asm/uaccess.h> | |
52 | #include <asm/page.h> | |
53 | ||
f7f4bccb MC |
54 | EXPORT_SYMBOL(jbd2_journal_extend); |
55 | EXPORT_SYMBOL(jbd2_journal_stop); | |
56 | EXPORT_SYMBOL(jbd2_journal_lock_updates); | |
57 | EXPORT_SYMBOL(jbd2_journal_unlock_updates); | |
58 | EXPORT_SYMBOL(jbd2_journal_get_write_access); | |
59 | EXPORT_SYMBOL(jbd2_journal_get_create_access); | |
60 | EXPORT_SYMBOL(jbd2_journal_get_undo_access); | |
e06c8227 | 61 | EXPORT_SYMBOL(jbd2_journal_set_triggers); |
f7f4bccb MC |
62 | EXPORT_SYMBOL(jbd2_journal_dirty_metadata); |
63 | EXPORT_SYMBOL(jbd2_journal_release_buffer); | |
64 | EXPORT_SYMBOL(jbd2_journal_forget); | |
470decc6 DK |
65 | #if 0 |
66 | EXPORT_SYMBOL(journal_sync_buffer); | |
67 | #endif | |
f7f4bccb MC |
68 | EXPORT_SYMBOL(jbd2_journal_flush); |
69 | EXPORT_SYMBOL(jbd2_journal_revoke); | |
70 | ||
71 | EXPORT_SYMBOL(jbd2_journal_init_dev); | |
72 | EXPORT_SYMBOL(jbd2_journal_init_inode); | |
f7f4bccb MC |
73 | EXPORT_SYMBOL(jbd2_journal_check_used_features); |
74 | EXPORT_SYMBOL(jbd2_journal_check_available_features); | |
75 | EXPORT_SYMBOL(jbd2_journal_set_features); | |
f7f4bccb MC |
76 | EXPORT_SYMBOL(jbd2_journal_load); |
77 | EXPORT_SYMBOL(jbd2_journal_destroy); | |
f7f4bccb MC |
78 | EXPORT_SYMBOL(jbd2_journal_abort); |
79 | EXPORT_SYMBOL(jbd2_journal_errno); | |
80 | EXPORT_SYMBOL(jbd2_journal_ack_err); | |
81 | EXPORT_SYMBOL(jbd2_journal_clear_err); | |
82 | EXPORT_SYMBOL(jbd2_log_wait_commit); | |
3b799d15 | 83 | EXPORT_SYMBOL(jbd2_log_start_commit); |
f7f4bccb MC |
84 | EXPORT_SYMBOL(jbd2_journal_start_commit); |
85 | EXPORT_SYMBOL(jbd2_journal_force_commit_nested); | |
86 | EXPORT_SYMBOL(jbd2_journal_wipe); | |
87 | EXPORT_SYMBOL(jbd2_journal_blocks_per_page); | |
88 | EXPORT_SYMBOL(jbd2_journal_invalidatepage); | |
89 | EXPORT_SYMBOL(jbd2_journal_try_to_free_buffers); | |
90 | EXPORT_SYMBOL(jbd2_journal_force_commit); | |
c851ed54 JK |
91 | EXPORT_SYMBOL(jbd2_journal_file_inode); |
92 | EXPORT_SYMBOL(jbd2_journal_init_jbd_inode); | |
93 | EXPORT_SYMBOL(jbd2_journal_release_jbd_inode); | |
94 | EXPORT_SYMBOL(jbd2_journal_begin_ordered_truncate); | |
8aefcd55 | 95 | EXPORT_SYMBOL(jbd2_inode_cache); |
470decc6 | 96 | |
470decc6 | 97 | static void __journal_abort_soft (journal_t *journal, int errno); |
d2eecb03 | 98 | static int jbd2_journal_create_slab(size_t slab_size); |
470decc6 DK |
99 | |
100 | /* | |
101 | * Helper function used to manage commit timeouts | |
102 | */ | |
103 | ||
104 | static void commit_timeout(unsigned long __data) | |
105 | { | |
106 | struct task_struct * p = (struct task_struct *) __data; | |
107 | ||
108 | wake_up_process(p); | |
109 | } | |
110 | ||
111 | /* | |
f7f4bccb | 112 | * kjournald2: The main thread function used to manage a logging device |
470decc6 DK |
113 | * journal. |
114 | * | |
115 | * This kernel thread is responsible for two things: | |
116 | * | |
117 | * 1) COMMIT: Every so often we need to commit the current state of the | |
118 | * filesystem to disk. The journal thread is responsible for writing | |
119 | * all of the metadata buffers to disk. | |
120 | * | |
121 | * 2) CHECKPOINT: We cannot reuse a used section of the log file until all | |
122 | * of the data in that part of the log has been rewritten elsewhere on | |
123 | * the disk. Flushing these old buffers to reclaim space in the log is | |
124 | * known as checkpointing, and this thread is responsible for that job. | |
125 | */ | |
126 | ||
f7f4bccb | 127 | static int kjournald2(void *arg) |
470decc6 DK |
128 | { |
129 | journal_t *journal = arg; | |
130 | transaction_t *transaction; | |
131 | ||
132 | /* | |
133 | * Set up an interval timer which can be used to trigger a commit wakeup | |
134 | * after the commit interval expires | |
135 | */ | |
136 | setup_timer(&journal->j_commit_timer, commit_timeout, | |
137 | (unsigned long)current); | |
138 | ||
35c80422 NC |
139 | set_freezable(); |
140 | ||
470decc6 DK |
141 | /* Record that the journal thread is running */ |
142 | journal->j_task = current; | |
143 | wake_up(&journal->j_wait_done_commit); | |
144 | ||
470decc6 DK |
145 | /* |
146 | * And now, wait forever for commit wakeup events. | |
147 | */ | |
a931da6a | 148 | write_lock(&journal->j_state_lock); |
470decc6 DK |
149 | |
150 | loop: | |
f7f4bccb | 151 | if (journal->j_flags & JBD2_UNMOUNT) |
470decc6 DK |
152 | goto end_loop; |
153 | ||
154 | jbd_debug(1, "commit_sequence=%d, commit_request=%d\n", | |
155 | journal->j_commit_sequence, journal->j_commit_request); | |
156 | ||
157 | if (journal->j_commit_sequence != journal->j_commit_request) { | |
158 | jbd_debug(1, "OK, requests differ\n"); | |
a931da6a | 159 | write_unlock(&journal->j_state_lock); |
470decc6 | 160 | del_timer_sync(&journal->j_commit_timer); |
f7f4bccb | 161 | jbd2_journal_commit_transaction(journal); |
a931da6a | 162 | write_lock(&journal->j_state_lock); |
470decc6 DK |
163 | goto loop; |
164 | } | |
165 | ||
166 | wake_up(&journal->j_wait_done_commit); | |
167 | if (freezing(current)) { | |
168 | /* | |
169 | * The simpler the better. Flushing journal isn't a | |
170 | * good idea, because that depends on threads that may | |
171 | * be already stopped. | |
172 | */ | |
f7f4bccb | 173 | jbd_debug(1, "Now suspending kjournald2\n"); |
a931da6a | 174 | write_unlock(&journal->j_state_lock); |
a0acae0e | 175 | try_to_freeze(); |
a931da6a | 176 | write_lock(&journal->j_state_lock); |
470decc6 DK |
177 | } else { |
178 | /* | |
179 | * We assume on resume that commits are already there, | |
180 | * so we don't sleep | |
181 | */ | |
182 | DEFINE_WAIT(wait); | |
183 | int should_sleep = 1; | |
184 | ||
185 | prepare_to_wait(&journal->j_wait_commit, &wait, | |
186 | TASK_INTERRUPTIBLE); | |
187 | if (journal->j_commit_sequence != journal->j_commit_request) | |
188 | should_sleep = 0; | |
189 | transaction = journal->j_running_transaction; | |
190 | if (transaction && time_after_eq(jiffies, | |
191 | transaction->t_expires)) | |
192 | should_sleep = 0; | |
f7f4bccb | 193 | if (journal->j_flags & JBD2_UNMOUNT) |
470decc6 DK |
194 | should_sleep = 0; |
195 | if (should_sleep) { | |
a931da6a | 196 | write_unlock(&journal->j_state_lock); |
470decc6 | 197 | schedule(); |
a931da6a | 198 | write_lock(&journal->j_state_lock); |
470decc6 DK |
199 | } |
200 | finish_wait(&journal->j_wait_commit, &wait); | |
201 | } | |
202 | ||
f7f4bccb | 203 | jbd_debug(1, "kjournald2 wakes\n"); |
470decc6 DK |
204 | |
205 | /* | |
206 | * Were we woken up by a commit wakeup event? | |
207 | */ | |
208 | transaction = journal->j_running_transaction; | |
209 | if (transaction && time_after_eq(jiffies, transaction->t_expires)) { | |
210 | journal->j_commit_request = transaction->t_tid; | |
211 | jbd_debug(1, "woke because of timeout\n"); | |
212 | } | |
213 | goto loop; | |
214 | ||
215 | end_loop: | |
a931da6a | 216 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
217 | del_timer_sync(&journal->j_commit_timer); |
218 | journal->j_task = NULL; | |
219 | wake_up(&journal->j_wait_done_commit); | |
220 | jbd_debug(1, "Journal thread exiting.\n"); | |
221 | return 0; | |
222 | } | |
223 | ||
97f06784 | 224 | static int jbd2_journal_start_thread(journal_t *journal) |
470decc6 | 225 | { |
97f06784 PE |
226 | struct task_struct *t; |
227 | ||
90576c0b TT |
228 | t = kthread_run(kjournald2, journal, "jbd2/%s", |
229 | journal->j_devname); | |
97f06784 PE |
230 | if (IS_ERR(t)) |
231 | return PTR_ERR(t); | |
232 | ||
1076d17a | 233 | wait_event(journal->j_wait_done_commit, journal->j_task != NULL); |
97f06784 | 234 | return 0; |
470decc6 DK |
235 | } |
236 | ||
237 | static void journal_kill_thread(journal_t *journal) | |
238 | { | |
a931da6a | 239 | write_lock(&journal->j_state_lock); |
f7f4bccb | 240 | journal->j_flags |= JBD2_UNMOUNT; |
470decc6 DK |
241 | |
242 | while (journal->j_task) { | |
243 | wake_up(&journal->j_wait_commit); | |
a931da6a | 244 | write_unlock(&journal->j_state_lock); |
1076d17a | 245 | wait_event(journal->j_wait_done_commit, journal->j_task == NULL); |
a931da6a | 246 | write_lock(&journal->j_state_lock); |
470decc6 | 247 | } |
a931da6a | 248 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
249 | } |
250 | ||
251 | /* | |
f7f4bccb | 252 | * jbd2_journal_write_metadata_buffer: write a metadata buffer to the journal. |
470decc6 DK |
253 | * |
254 | * Writes a metadata buffer to a given disk block. The actual IO is not | |
255 | * performed but a new buffer_head is constructed which labels the data | |
256 | * to be written with the correct destination disk block. | |
257 | * | |
258 | * Any magic-number escaping which needs to be done will cause a | |
259 | * copy-out here. If the buffer happens to start with the | |
f7f4bccb | 260 | * JBD2_MAGIC_NUMBER, then we can't write it to the log directly: the |
470decc6 DK |
261 | * magic number is only written to the log for descripter blocks. In |
262 | * this case, we copy the data and replace the first word with 0, and we | |
263 | * return a result code which indicates that this buffer needs to be | |
264 | * marked as an escaped buffer in the corresponding log descriptor | |
265 | * block. The missing word can then be restored when the block is read | |
266 | * during recovery. | |
267 | * | |
268 | * If the source buffer has already been modified by a new transaction | |
269 | * since we took the last commit snapshot, we use the frozen copy of | |
270 | * that data for IO. If we end up using the existing buffer_head's data | |
271 | * for the write, then we *have* to lock the buffer to prevent anyone | |
272 | * else from using and possibly modifying it while the IO is in | |
273 | * progress. | |
274 | * | |
275 | * The function returns a pointer to the buffer_heads to be used for IO. | |
276 | * | |
277 | * We assume that the journal has already been locked in this function. | |
278 | * | |
279 | * Return value: | |
280 | * <0: Error | |
281 | * >=0: Finished OK | |
282 | * | |
283 | * On success: | |
284 | * Bit 0 set == escape performed on the data | |
285 | * Bit 1 set == buffer copy-out performed (kfree the data after IO) | |
286 | */ | |
287 | ||
f7f4bccb | 288 | int jbd2_journal_write_metadata_buffer(transaction_t *transaction, |
470decc6 DK |
289 | struct journal_head *jh_in, |
290 | struct journal_head **jh_out, | |
18eba7aa | 291 | unsigned long long blocknr) |
470decc6 DK |
292 | { |
293 | int need_copy_out = 0; | |
294 | int done_copy_out = 0; | |
295 | int do_escape = 0; | |
296 | char *mapped_data; | |
297 | struct buffer_head *new_bh; | |
298 | struct journal_head *new_jh; | |
299 | struct page *new_page; | |
300 | unsigned int new_offset; | |
301 | struct buffer_head *bh_in = jh2bh(jh_in); | |
96577c43 | 302 | journal_t *journal = transaction->t_journal; |
470decc6 DK |
303 | |
304 | /* | |
305 | * The buffer really shouldn't be locked: only the current committing | |
306 | * transaction is allowed to write it, so nobody else is allowed | |
307 | * to do any IO. | |
308 | * | |
309 | * akpm: except if we're journalling data, and write() output is | |
310 | * also part of a shared mapping, and another thread has | |
311 | * decided to launch a writepage() against this buffer. | |
312 | */ | |
313 | J_ASSERT_BH(bh_in, buffer_jbddirty(bh_in)); | |
314 | ||
47def826 TT |
315 | retry_alloc: |
316 | new_bh = alloc_buffer_head(GFP_NOFS); | |
317 | if (!new_bh) { | |
318 | /* | |
319 | * Failure is not an option, but __GFP_NOFAIL is going | |
320 | * away; so we retry ourselves here. | |
321 | */ | |
322 | congestion_wait(BLK_RW_ASYNC, HZ/50); | |
323 | goto retry_alloc; | |
324 | } | |
325 | ||
96577c43 | 326 | /* keep subsequent assertions sane */ |
327 | new_bh->b_state = 0; | |
328 | init_buffer(new_bh, NULL, NULL); | |
329 | atomic_set(&new_bh->b_count, 1); | |
330 | new_jh = jbd2_journal_add_journal_head(new_bh); /* This sleeps */ | |
470decc6 DK |
331 | |
332 | /* | |
333 | * If a new transaction has already done a buffer copy-out, then | |
334 | * we use that version of the data for the commit. | |
335 | */ | |
336 | jbd_lock_bh_state(bh_in); | |
337 | repeat: | |
338 | if (jh_in->b_frozen_data) { | |
339 | done_copy_out = 1; | |
340 | new_page = virt_to_page(jh_in->b_frozen_data); | |
341 | new_offset = offset_in_page(jh_in->b_frozen_data); | |
342 | } else { | |
343 | new_page = jh2bh(jh_in)->b_page; | |
344 | new_offset = offset_in_page(jh2bh(jh_in)->b_data); | |
345 | } | |
346 | ||
303a8f2a | 347 | mapped_data = kmap_atomic(new_page); |
e06c8227 | 348 | /* |
13ceef09 JK |
349 | * Fire data frozen trigger if data already wasn't frozen. Do this |
350 | * before checking for escaping, as the trigger may modify the magic | |
351 | * offset. If a copy-out happens afterwards, it will have the correct | |
352 | * data in the buffer. | |
e06c8227 | 353 | */ |
13ceef09 JK |
354 | if (!done_copy_out) |
355 | jbd2_buffer_frozen_trigger(jh_in, mapped_data + new_offset, | |
356 | jh_in->b_triggers); | |
e06c8227 | 357 | |
470decc6 DK |
358 | /* |
359 | * Check for escaping | |
360 | */ | |
361 | if (*((__be32 *)(mapped_data + new_offset)) == | |
f7f4bccb | 362 | cpu_to_be32(JBD2_MAGIC_NUMBER)) { |
470decc6 DK |
363 | need_copy_out = 1; |
364 | do_escape = 1; | |
365 | } | |
303a8f2a | 366 | kunmap_atomic(mapped_data); |
470decc6 DK |
367 | |
368 | /* | |
369 | * Do we need to do a data copy? | |
370 | */ | |
371 | if (need_copy_out && !done_copy_out) { | |
372 | char *tmp; | |
373 | ||
374 | jbd_unlock_bh_state(bh_in); | |
af1e76d6 | 375 | tmp = jbd2_alloc(bh_in->b_size, GFP_NOFS); |
e6ec116b TT |
376 | if (!tmp) { |
377 | jbd2_journal_put_journal_head(new_jh); | |
378 | return -ENOMEM; | |
379 | } | |
470decc6 DK |
380 | jbd_lock_bh_state(bh_in); |
381 | if (jh_in->b_frozen_data) { | |
af1e76d6 | 382 | jbd2_free(tmp, bh_in->b_size); |
470decc6 DK |
383 | goto repeat; |
384 | } | |
385 | ||
386 | jh_in->b_frozen_data = tmp; | |
303a8f2a | 387 | mapped_data = kmap_atomic(new_page); |
470decc6 | 388 | memcpy(tmp, mapped_data + new_offset, jh2bh(jh_in)->b_size); |
303a8f2a | 389 | kunmap_atomic(mapped_data); |
470decc6 DK |
390 | |
391 | new_page = virt_to_page(tmp); | |
392 | new_offset = offset_in_page(tmp); | |
393 | done_copy_out = 1; | |
e06c8227 JB |
394 | |
395 | /* | |
396 | * This isn't strictly necessary, as we're using frozen | |
397 | * data for the escaping, but it keeps consistency with | |
398 | * b_frozen_data usage. | |
399 | */ | |
400 | jh_in->b_frozen_triggers = jh_in->b_triggers; | |
470decc6 DK |
401 | } |
402 | ||
403 | /* | |
404 | * Did we need to do an escaping? Now we've done all the | |
405 | * copying, we can finally do so. | |
406 | */ | |
407 | if (do_escape) { | |
303a8f2a | 408 | mapped_data = kmap_atomic(new_page); |
470decc6 | 409 | *((unsigned int *)(mapped_data + new_offset)) = 0; |
303a8f2a | 410 | kunmap_atomic(mapped_data); |
470decc6 DK |
411 | } |
412 | ||
470decc6 DK |
413 | set_bh_page(new_bh, new_page, new_offset); |
414 | new_jh->b_transaction = NULL; | |
415 | new_bh->b_size = jh2bh(jh_in)->b_size; | |
416 | new_bh->b_bdev = transaction->t_journal->j_dev; | |
417 | new_bh->b_blocknr = blocknr; | |
418 | set_buffer_mapped(new_bh); | |
419 | set_buffer_dirty(new_bh); | |
420 | ||
421 | *jh_out = new_jh; | |
422 | ||
423 | /* | |
424 | * The to-be-written buffer needs to get moved to the io queue, | |
425 | * and the original buffer whose contents we are shadowing or | |
426 | * copying is moved to the transaction's shadow queue. | |
427 | */ | |
428 | JBUFFER_TRACE(jh_in, "file as BJ_Shadow"); | |
96577c43 | 429 | spin_lock(&journal->j_list_lock); |
430 | __jbd2_journal_file_buffer(jh_in, transaction, BJ_Shadow); | |
431 | spin_unlock(&journal->j_list_lock); | |
432 | jbd_unlock_bh_state(bh_in); | |
433 | ||
470decc6 | 434 | JBUFFER_TRACE(new_jh, "file as BJ_IO"); |
f7f4bccb | 435 | jbd2_journal_file_buffer(new_jh, transaction, BJ_IO); |
470decc6 DK |
436 | |
437 | return do_escape | (done_copy_out << 1); | |
438 | } | |
439 | ||
440 | /* | |
441 | * Allocation code for the journal file. Manage the space left in the | |
442 | * journal, so that we can begin checkpointing when appropriate. | |
443 | */ | |
444 | ||
445 | /* | |
f7f4bccb | 446 | * __jbd2_log_space_left: Return the number of free blocks left in the journal. |
470decc6 DK |
447 | * |
448 | * Called with the journal already locked. | |
449 | * | |
450 | * Called under j_state_lock | |
451 | */ | |
452 | ||
f7f4bccb | 453 | int __jbd2_log_space_left(journal_t *journal) |
470decc6 DK |
454 | { |
455 | int left = journal->j_free; | |
456 | ||
a931da6a | 457 | /* assert_spin_locked(&journal->j_state_lock); */ |
470decc6 DK |
458 | |
459 | /* | |
460 | * Be pessimistic here about the number of those free blocks which | |
461 | * might be required for log descriptor control blocks. | |
462 | */ | |
463 | ||
464 | #define MIN_LOG_RESERVED_BLOCKS 32 /* Allow for rounding errors */ | |
465 | ||
466 | left -= MIN_LOG_RESERVED_BLOCKS; | |
467 | ||
468 | if (left <= 0) | |
469 | return 0; | |
470 | left -= (left >> 3); | |
471 | return left; | |
472 | } | |
473 | ||
474 | /* | |
e4471831 TT |
475 | * Called with j_state_lock locked for writing. |
476 | * Returns true if a transaction commit was started. | |
470decc6 | 477 | */ |
f7f4bccb | 478 | int __jbd2_log_start_commit(journal_t *journal, tid_t target) |
470decc6 DK |
479 | { |
480 | /* | |
deeeaf13 TT |
481 | * The only transaction we can possibly wait upon is the |
482 | * currently running transaction (if it exists). Otherwise, | |
483 | * the target tid must be an old one. | |
470decc6 | 484 | */ |
deeeaf13 TT |
485 | if (journal->j_running_transaction && |
486 | journal->j_running_transaction->t_tid == target) { | |
470decc6 | 487 | /* |
bcf3d0bc | 488 | * We want a new commit: OK, mark the request and wakeup the |
470decc6 DK |
489 | * commit thread. We do _not_ do the commit ourselves. |
490 | */ | |
491 | ||
492 | journal->j_commit_request = target; | |
f2a44523 | 493 | jbd_debug(1, "JBD2: requesting commit %d/%d\n", |
470decc6 DK |
494 | journal->j_commit_request, |
495 | journal->j_commit_sequence); | |
496 | wake_up(&journal->j_wait_commit); | |
497 | return 1; | |
deeeaf13 TT |
498 | } else if (!tid_geq(journal->j_commit_request, target)) |
499 | /* This should never happen, but if it does, preserve | |
500 | the evidence before kjournald goes into a loop and | |
501 | increments j_commit_sequence beyond all recognition. */ | |
f2a44523 | 502 | WARN_ONCE(1, "JBD2: bad log_start_commit: %u %u %u %u\n", |
1be2add6 TT |
503 | journal->j_commit_request, |
504 | journal->j_commit_sequence, | |
505 | target, journal->j_running_transaction ? | |
506 | journal->j_running_transaction->t_tid : 0); | |
470decc6 DK |
507 | return 0; |
508 | } | |
509 | ||
f7f4bccb | 510 | int jbd2_log_start_commit(journal_t *journal, tid_t tid) |
470decc6 DK |
511 | { |
512 | int ret; | |
513 | ||
a931da6a | 514 | write_lock(&journal->j_state_lock); |
f7f4bccb | 515 | ret = __jbd2_log_start_commit(journal, tid); |
a931da6a | 516 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
517 | return ret; |
518 | } | |
519 | ||
520 | /* | |
521 | * Force and wait upon a commit if the calling process is not within | |
522 | * transaction. This is used for forcing out undo-protected data which contains | |
523 | * bitmaps, when the fs is running out of space. | |
524 | * | |
525 | * We can only force the running transaction if we don't have an active handle; | |
526 | * otherwise, we will deadlock. | |
527 | * | |
528 | * Returns true if a transaction was started. | |
529 | */ | |
f7f4bccb | 530 | int jbd2_journal_force_commit_nested(journal_t *journal) |
470decc6 DK |
531 | { |
532 | transaction_t *transaction = NULL; | |
533 | tid_t tid; | |
e4471831 | 534 | int need_to_start = 0; |
470decc6 | 535 | |
a931da6a | 536 | read_lock(&journal->j_state_lock); |
470decc6 DK |
537 | if (journal->j_running_transaction && !current->journal_info) { |
538 | transaction = journal->j_running_transaction; | |
e4471831 TT |
539 | if (!tid_geq(journal->j_commit_request, transaction->t_tid)) |
540 | need_to_start = 1; | |
470decc6 DK |
541 | } else if (journal->j_committing_transaction) |
542 | transaction = journal->j_committing_transaction; | |
543 | ||
544 | if (!transaction) { | |
a931da6a | 545 | read_unlock(&journal->j_state_lock); |
470decc6 DK |
546 | return 0; /* Nothing to retry */ |
547 | } | |
548 | ||
549 | tid = transaction->t_tid; | |
a931da6a | 550 | read_unlock(&journal->j_state_lock); |
e4471831 TT |
551 | if (need_to_start) |
552 | jbd2_log_start_commit(journal, tid); | |
f7f4bccb | 553 | jbd2_log_wait_commit(journal, tid); |
470decc6 DK |
554 | return 1; |
555 | } | |
556 | ||
557 | /* | |
558 | * Start a commit of the current running transaction (if any). Returns true | |
c88ccea3 JK |
559 | * if a transaction is going to be committed (or is currently already |
560 | * committing), and fills its tid in at *ptid | |
470decc6 | 561 | */ |
f7f4bccb | 562 | int jbd2_journal_start_commit(journal_t *journal, tid_t *ptid) |
470decc6 DK |
563 | { |
564 | int ret = 0; | |
565 | ||
a931da6a | 566 | write_lock(&journal->j_state_lock); |
470decc6 DK |
567 | if (journal->j_running_transaction) { |
568 | tid_t tid = journal->j_running_transaction->t_tid; | |
569 | ||
c88ccea3 JK |
570 | __jbd2_log_start_commit(journal, tid); |
571 | /* There's a running transaction and we've just made sure | |
572 | * it's commit has been scheduled. */ | |
573 | if (ptid) | |
470decc6 | 574 | *ptid = tid; |
c88ccea3 JK |
575 | ret = 1; |
576 | } else if (journal->j_committing_transaction) { | |
470decc6 DK |
577 | /* |
578 | * If ext3_write_super() recently started a commit, then we | |
579 | * have to wait for completion of that transaction | |
580 | */ | |
c88ccea3 JK |
581 | if (ptid) |
582 | *ptid = journal->j_committing_transaction->t_tid; | |
470decc6 DK |
583 | ret = 1; |
584 | } | |
a931da6a | 585 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
586 | return ret; |
587 | } | |
588 | ||
bbd2be36 JK |
589 | /* |
590 | * Return 1 if a given transaction has not yet sent barrier request | |
591 | * connected with a transaction commit. If 0 is returned, transaction | |
592 | * may or may not have sent the barrier. Used to avoid sending barrier | |
593 | * twice in common cases. | |
594 | */ | |
595 | int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t tid) | |
596 | { | |
597 | int ret = 0; | |
598 | transaction_t *commit_trans; | |
599 | ||
600 | if (!(journal->j_flags & JBD2_BARRIER)) | |
601 | return 0; | |
602 | read_lock(&journal->j_state_lock); | |
603 | /* Transaction already committed? */ | |
604 | if (tid_geq(journal->j_commit_sequence, tid)) | |
605 | goto out; | |
606 | commit_trans = journal->j_committing_transaction; | |
607 | if (!commit_trans || commit_trans->t_tid != tid) { | |
608 | ret = 1; | |
609 | goto out; | |
610 | } | |
611 | /* | |
612 | * Transaction is being committed and we already proceeded to | |
613 | * submitting a flush to fs partition? | |
614 | */ | |
615 | if (journal->j_fs_dev != journal->j_dev) { | |
616 | if (!commit_trans->t_need_data_flush || | |
617 | commit_trans->t_state >= T_COMMIT_DFLUSH) | |
618 | goto out; | |
619 | } else { | |
620 | if (commit_trans->t_state >= T_COMMIT_JFLUSH) | |
621 | goto out; | |
622 | } | |
623 | ret = 1; | |
624 | out: | |
625 | read_unlock(&journal->j_state_lock); | |
626 | return ret; | |
627 | } | |
628 | EXPORT_SYMBOL(jbd2_trans_will_send_data_barrier); | |
629 | ||
470decc6 DK |
630 | /* |
631 | * Wait for a specified commit to complete. | |
632 | * The caller may not hold the journal lock. | |
633 | */ | |
f7f4bccb | 634 | int jbd2_log_wait_commit(journal_t *journal, tid_t tid) |
470decc6 DK |
635 | { |
636 | int err = 0; | |
637 | ||
a931da6a | 638 | read_lock(&journal->j_state_lock); |
e23291b9 | 639 | #ifdef CONFIG_JBD2_DEBUG |
470decc6 DK |
640 | if (!tid_geq(journal->j_commit_request, tid)) { |
641 | printk(KERN_EMERG | |
642 | "%s: error: j_commit_request=%d, tid=%d\n", | |
329d291f | 643 | __func__, journal->j_commit_request, tid); |
470decc6 | 644 | } |
470decc6 | 645 | #endif |
470decc6 | 646 | while (tid_gt(tid, journal->j_commit_sequence)) { |
f2a44523 | 647 | jbd_debug(1, "JBD2: want %d, j_commit_sequence=%d\n", |
470decc6 DK |
648 | tid, journal->j_commit_sequence); |
649 | wake_up(&journal->j_wait_commit); | |
a931da6a | 650 | read_unlock(&journal->j_state_lock); |
470decc6 DK |
651 | wait_event(journal->j_wait_done_commit, |
652 | !tid_gt(tid, journal->j_commit_sequence)); | |
a931da6a | 653 | read_lock(&journal->j_state_lock); |
470decc6 | 654 | } |
a931da6a | 655 | read_unlock(&journal->j_state_lock); |
470decc6 DK |
656 | |
657 | if (unlikely(is_journal_aborted(journal))) { | |
658 | printk(KERN_EMERG "journal commit I/O error\n"); | |
659 | err = -EIO; | |
660 | } | |
661 | return err; | |
662 | } | |
663 | ||
664 | /* | |
665 | * Log buffer allocation routines: | |
666 | */ | |
667 | ||
18eba7aa | 668 | int jbd2_journal_next_log_block(journal_t *journal, unsigned long long *retp) |
470decc6 DK |
669 | { |
670 | unsigned long blocknr; | |
671 | ||
a931da6a | 672 | write_lock(&journal->j_state_lock); |
470decc6 DK |
673 | J_ASSERT(journal->j_free > 1); |
674 | ||
675 | blocknr = journal->j_head; | |
676 | journal->j_head++; | |
677 | journal->j_free--; | |
678 | if (journal->j_head == journal->j_last) | |
679 | journal->j_head = journal->j_first; | |
a931da6a | 680 | write_unlock(&journal->j_state_lock); |
f7f4bccb | 681 | return jbd2_journal_bmap(journal, blocknr, retp); |
470decc6 DK |
682 | } |
683 | ||
684 | /* | |
685 | * Conversion of logical to physical block numbers for the journal | |
686 | * | |
687 | * On external journals the journal blocks are identity-mapped, so | |
688 | * this is a no-op. If needed, we can use j_blk_offset - everything is | |
689 | * ready. | |
690 | */ | |
f7f4bccb | 691 | int jbd2_journal_bmap(journal_t *journal, unsigned long blocknr, |
18eba7aa | 692 | unsigned long long *retp) |
470decc6 DK |
693 | { |
694 | int err = 0; | |
18eba7aa | 695 | unsigned long long ret; |
470decc6 DK |
696 | |
697 | if (journal->j_inode) { | |
698 | ret = bmap(journal->j_inode, blocknr); | |
699 | if (ret) | |
700 | *retp = ret; | |
701 | else { | |
470decc6 DK |
702 | printk(KERN_ALERT "%s: journal block not found " |
703 | "at offset %lu on %s\n", | |
05496769 | 704 | __func__, blocknr, journal->j_devname); |
470decc6 DK |
705 | err = -EIO; |
706 | __journal_abort_soft(journal, err); | |
707 | } | |
708 | } else { | |
709 | *retp = blocknr; /* +journal->j_blk_offset */ | |
710 | } | |
711 | return err; | |
712 | } | |
713 | ||
714 | /* | |
715 | * We play buffer_head aliasing tricks to write data/metadata blocks to | |
716 | * the journal without copying their contents, but for journal | |
717 | * descriptor blocks we do need to generate bona fide buffers. | |
718 | * | |
f7f4bccb | 719 | * After the caller of jbd2_journal_get_descriptor_buffer() has finished modifying |
470decc6 DK |
720 | * the buffer's contents they really should run flush_dcache_page(bh->b_page). |
721 | * But we don't bother doing that, so there will be coherency problems with | |
722 | * mmaps of blockdevs which hold live JBD-controlled filesystems. | |
723 | */ | |
f7f4bccb | 724 | struct journal_head *jbd2_journal_get_descriptor_buffer(journal_t *journal) |
470decc6 DK |
725 | { |
726 | struct buffer_head *bh; | |
18eba7aa | 727 | unsigned long long blocknr; |
470decc6 DK |
728 | int err; |
729 | ||
f7f4bccb | 730 | err = jbd2_journal_next_log_block(journal, &blocknr); |
470decc6 DK |
731 | |
732 | if (err) | |
733 | return NULL; | |
734 | ||
735 | bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); | |
4b905671 JK |
736 | if (!bh) |
737 | return NULL; | |
470decc6 DK |
738 | lock_buffer(bh); |
739 | memset(bh->b_data, 0, journal->j_blocksize); | |
740 | set_buffer_uptodate(bh); | |
741 | unlock_buffer(bh); | |
742 | BUFFER_TRACE(bh, "return this buffer"); | |
f7f4bccb | 743 | return jbd2_journal_add_journal_head(bh); |
470decc6 DK |
744 | } |
745 | ||
79feb521 JK |
746 | /* |
747 | * Return tid of the oldest transaction in the journal and block in the journal | |
748 | * where the transaction starts. | |
749 | * | |
750 | * If the journal is now empty, return which will be the next transaction ID | |
751 | * we will write and where will that transaction start. | |
752 | * | |
753 | * The return value is 0 if journal tail cannot be pushed any further, 1 if | |
754 | * it can. | |
755 | */ | |
756 | int jbd2_journal_get_log_tail(journal_t *journal, tid_t *tid, | |
757 | unsigned long *block) | |
758 | { | |
759 | transaction_t *transaction; | |
760 | int ret; | |
761 | ||
762 | read_lock(&journal->j_state_lock); | |
763 | spin_lock(&journal->j_list_lock); | |
764 | transaction = journal->j_checkpoint_transactions; | |
765 | if (transaction) { | |
766 | *tid = transaction->t_tid; | |
767 | *block = transaction->t_log_start; | |
768 | } else if ((transaction = journal->j_committing_transaction) != NULL) { | |
769 | *tid = transaction->t_tid; | |
770 | *block = transaction->t_log_start; | |
771 | } else if ((transaction = journal->j_running_transaction) != NULL) { | |
772 | *tid = transaction->t_tid; | |
773 | *block = journal->j_head; | |
774 | } else { | |
775 | *tid = journal->j_transaction_sequence; | |
776 | *block = journal->j_head; | |
777 | } | |
778 | ret = tid_gt(*tid, journal->j_tail_sequence); | |
779 | spin_unlock(&journal->j_list_lock); | |
780 | read_unlock(&journal->j_state_lock); | |
781 | ||
782 | return ret; | |
783 | } | |
784 | ||
785 | /* | |
786 | * Update information in journal structure and in on disk journal superblock | |
787 | * about log tail. This function does not check whether information passed in | |
788 | * really pushes log tail further. It's responsibility of the caller to make | |
789 | * sure provided log tail information is valid (e.g. by holding | |
790 | * j_checkpoint_mutex all the time between computing log tail and calling this | |
791 | * function as is the case with jbd2_cleanup_journal_tail()). | |
792 | * | |
793 | * Requires j_checkpoint_mutex | |
794 | */ | |
795 | void __jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block) | |
796 | { | |
797 | unsigned long freed; | |
798 | ||
799 | BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); | |
800 | ||
801 | /* | |
802 | * We cannot afford for write to remain in drive's caches since as | |
803 | * soon as we update j_tail, next transaction can start reusing journal | |
804 | * space and if we lose sb update during power failure we'd replay | |
805 | * old transaction with possibly newly overwritten data. | |
806 | */ | |
807 | jbd2_journal_update_sb_log_tail(journal, tid, block, WRITE_FUA); | |
808 | write_lock(&journal->j_state_lock); | |
809 | freed = block - journal->j_tail; | |
810 | if (block < journal->j_tail) | |
811 | freed += journal->j_last - journal->j_first; | |
812 | ||
813 | trace_jbd2_update_log_tail(journal, tid, block, freed); | |
814 | jbd_debug(1, | |
815 | "Cleaning journal tail from %d to %d (offset %lu), " | |
816 | "freeing %lu\n", | |
817 | journal->j_tail_sequence, tid, block, freed); | |
818 | ||
819 | journal->j_free += freed; | |
820 | journal->j_tail_sequence = tid; | |
821 | journal->j_tail = block; | |
822 | write_unlock(&journal->j_state_lock); | |
823 | } | |
824 | ||
3339578f JK |
825 | /* |
826 | * This is a variaon of __jbd2_update_log_tail which checks for validity of | |
827 | * provided log tail and locks j_checkpoint_mutex. So it is safe against races | |
828 | * with other threads updating log tail. | |
829 | */ | |
830 | void jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block) | |
831 | { | |
832 | mutex_lock(&journal->j_checkpoint_mutex); | |
833 | if (tid_gt(tid, journal->j_tail_sequence)) | |
834 | __jbd2_update_log_tail(journal, tid, block); | |
835 | mutex_unlock(&journal->j_checkpoint_mutex); | |
836 | } | |
837 | ||
8e85fb3f JL |
838 | struct jbd2_stats_proc_session { |
839 | journal_t *journal; | |
840 | struct transaction_stats_s *stats; | |
841 | int start; | |
842 | int max; | |
843 | }; | |
844 | ||
8e85fb3f JL |
845 | static void *jbd2_seq_info_start(struct seq_file *seq, loff_t *pos) |
846 | { | |
847 | return *pos ? NULL : SEQ_START_TOKEN; | |
848 | } | |
849 | ||
850 | static void *jbd2_seq_info_next(struct seq_file *seq, void *v, loff_t *pos) | |
851 | { | |
852 | return NULL; | |
853 | } | |
854 | ||
855 | static int jbd2_seq_info_show(struct seq_file *seq, void *v) | |
856 | { | |
857 | struct jbd2_stats_proc_session *s = seq->private; | |
858 | ||
859 | if (v != SEQ_START_TOKEN) | |
860 | return 0; | |
bf699327 | 861 | seq_printf(seq, "%lu transaction, each up to %u blocks\n", |
8e85fb3f JL |
862 | s->stats->ts_tid, |
863 | s->journal->j_max_transaction_buffers); | |
864 | if (s->stats->ts_tid == 0) | |
865 | return 0; | |
866 | seq_printf(seq, "average: \n %ums waiting for transaction\n", | |
bf699327 | 867 | jiffies_to_msecs(s->stats->run.rs_wait / s->stats->ts_tid)); |
8e85fb3f | 868 | seq_printf(seq, " %ums running transaction\n", |
bf699327 | 869 | jiffies_to_msecs(s->stats->run.rs_running / s->stats->ts_tid)); |
8e85fb3f | 870 | seq_printf(seq, " %ums transaction was being locked\n", |
bf699327 | 871 | jiffies_to_msecs(s->stats->run.rs_locked / s->stats->ts_tid)); |
8e85fb3f | 872 | seq_printf(seq, " %ums flushing data (in ordered mode)\n", |
bf699327 | 873 | jiffies_to_msecs(s->stats->run.rs_flushing / s->stats->ts_tid)); |
8e85fb3f | 874 | seq_printf(seq, " %ums logging transaction\n", |
bf699327 | 875 | jiffies_to_msecs(s->stats->run.rs_logging / s->stats->ts_tid)); |
c225aa57 SHT |
876 | seq_printf(seq, " %lluus average transaction commit time\n", |
877 | div_u64(s->journal->j_average_commit_time, 1000)); | |
8e85fb3f | 878 | seq_printf(seq, " %lu handles per transaction\n", |
bf699327 | 879 | s->stats->run.rs_handle_count / s->stats->ts_tid); |
8e85fb3f | 880 | seq_printf(seq, " %lu blocks per transaction\n", |
bf699327 | 881 | s->stats->run.rs_blocks / s->stats->ts_tid); |
8e85fb3f | 882 | seq_printf(seq, " %lu logged blocks per transaction\n", |
bf699327 | 883 | s->stats->run.rs_blocks_logged / s->stats->ts_tid); |
8e85fb3f JL |
884 | return 0; |
885 | } | |
886 | ||
887 | static void jbd2_seq_info_stop(struct seq_file *seq, void *v) | |
888 | { | |
889 | } | |
890 | ||
88e9d34c | 891 | static const struct seq_operations jbd2_seq_info_ops = { |
8e85fb3f JL |
892 | .start = jbd2_seq_info_start, |
893 | .next = jbd2_seq_info_next, | |
894 | .stop = jbd2_seq_info_stop, | |
895 | .show = jbd2_seq_info_show, | |
896 | }; | |
897 | ||
898 | static int jbd2_seq_info_open(struct inode *inode, struct file *file) | |
899 | { | |
900 | journal_t *journal = PDE(inode)->data; | |
901 | struct jbd2_stats_proc_session *s; | |
902 | int rc, size; | |
903 | ||
904 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
905 | if (s == NULL) | |
906 | return -ENOMEM; | |
907 | size = sizeof(struct transaction_stats_s); | |
908 | s->stats = kmalloc(size, GFP_KERNEL); | |
909 | if (s->stats == NULL) { | |
910 | kfree(s); | |
911 | return -ENOMEM; | |
912 | } | |
913 | spin_lock(&journal->j_history_lock); | |
914 | memcpy(s->stats, &journal->j_stats, size); | |
915 | s->journal = journal; | |
916 | spin_unlock(&journal->j_history_lock); | |
917 | ||
918 | rc = seq_open(file, &jbd2_seq_info_ops); | |
919 | if (rc == 0) { | |
920 | struct seq_file *m = file->private_data; | |
921 | m->private = s; | |
922 | } else { | |
923 | kfree(s->stats); | |
924 | kfree(s); | |
925 | } | |
926 | return rc; | |
927 | ||
928 | } | |
929 | ||
930 | static int jbd2_seq_info_release(struct inode *inode, struct file *file) | |
931 | { | |
932 | struct seq_file *seq = file->private_data; | |
933 | struct jbd2_stats_proc_session *s = seq->private; | |
934 | kfree(s->stats); | |
935 | kfree(s); | |
936 | return seq_release(inode, file); | |
937 | } | |
938 | ||
828c0950 | 939 | static const struct file_operations jbd2_seq_info_fops = { |
8e85fb3f JL |
940 | .owner = THIS_MODULE, |
941 | .open = jbd2_seq_info_open, | |
942 | .read = seq_read, | |
943 | .llseek = seq_lseek, | |
944 | .release = jbd2_seq_info_release, | |
945 | }; | |
946 | ||
947 | static struct proc_dir_entry *proc_jbd2_stats; | |
948 | ||
949 | static void jbd2_stats_proc_init(journal_t *journal) | |
950 | { | |
05496769 | 951 | journal->j_proc_entry = proc_mkdir(journal->j_devname, proc_jbd2_stats); |
8e85fb3f | 952 | if (journal->j_proc_entry) { |
79da3664 DL |
953 | proc_create_data("info", S_IRUGO, journal->j_proc_entry, |
954 | &jbd2_seq_info_fops, journal); | |
8e85fb3f JL |
955 | } |
956 | } | |
957 | ||
958 | static void jbd2_stats_proc_exit(journal_t *journal) | |
959 | { | |
8e85fb3f | 960 | remove_proc_entry("info", journal->j_proc_entry); |
05496769 | 961 | remove_proc_entry(journal->j_devname, proc_jbd2_stats); |
8e85fb3f JL |
962 | } |
963 | ||
470decc6 DK |
964 | /* |
965 | * Management for journal control blocks: functions to create and | |
966 | * destroy journal_t structures, and to initialise and read existing | |
967 | * journal blocks from disk. */ | |
968 | ||
969 | /* First: create and setup a journal_t object in memory. We initialise | |
970 | * very few fields yet: that has to wait until we have created the | |
971 | * journal structures from from scratch, or loaded them from disk. */ | |
972 | ||
973 | static journal_t * journal_init_common (void) | |
974 | { | |
975 | journal_t *journal; | |
976 | int err; | |
977 | ||
3ebfdf88 | 978 | journal = kzalloc(sizeof(*journal), GFP_KERNEL); |
470decc6 | 979 | if (!journal) |
b7271b0a | 980 | return NULL; |
470decc6 DK |
981 | |
982 | init_waitqueue_head(&journal->j_wait_transaction_locked); | |
983 | init_waitqueue_head(&journal->j_wait_logspace); | |
984 | init_waitqueue_head(&journal->j_wait_done_commit); | |
985 | init_waitqueue_head(&journal->j_wait_checkpoint); | |
986 | init_waitqueue_head(&journal->j_wait_commit); | |
987 | init_waitqueue_head(&journal->j_wait_updates); | |
988 | mutex_init(&journal->j_barrier); | |
989 | mutex_init(&journal->j_checkpoint_mutex); | |
990 | spin_lock_init(&journal->j_revoke_lock); | |
991 | spin_lock_init(&journal->j_list_lock); | |
a931da6a | 992 | rwlock_init(&journal->j_state_lock); |
470decc6 | 993 | |
cd02ff0b | 994 | journal->j_commit_interval = (HZ * JBD2_DEFAULT_MAX_COMMIT_AGE); |
30773840 TT |
995 | journal->j_min_batch_time = 0; |
996 | journal->j_max_batch_time = 15000; /* 15ms */ | |
470decc6 DK |
997 | |
998 | /* The journal is marked for error until we succeed with recovery! */ | |
f7f4bccb | 999 | journal->j_flags = JBD2_ABORT; |
470decc6 DK |
1000 | |
1001 | /* Set up a default-sized revoke table for the new mount. */ | |
f7f4bccb | 1002 | err = jbd2_journal_init_revoke(journal, JOURNAL_REVOKE_DEFAULT_HASH); |
470decc6 DK |
1003 | if (err) { |
1004 | kfree(journal); | |
b7271b0a | 1005 | return NULL; |
470decc6 | 1006 | } |
8e85fb3f | 1007 | |
bf699327 | 1008 | spin_lock_init(&journal->j_history_lock); |
8e85fb3f | 1009 | |
470decc6 | 1010 | return journal; |
470decc6 DK |
1011 | } |
1012 | ||
f7f4bccb | 1013 | /* jbd2_journal_init_dev and jbd2_journal_init_inode: |
470decc6 DK |
1014 | * |
1015 | * Create a journal structure assigned some fixed set of disk blocks to | |
1016 | * the journal. We don't actually touch those disk blocks yet, but we | |
1017 | * need to set up all of the mapping information to tell the journaling | |
1018 | * system where the journal blocks are. | |
1019 | * | |
1020 | */ | |
1021 | ||
1022 | /** | |
5648ba5b | 1023 | * journal_t * jbd2_journal_init_dev() - creates and initialises a journal structure |
470decc6 DK |
1024 | * @bdev: Block device on which to create the journal |
1025 | * @fs_dev: Device which hold journalled filesystem for this journal. | |
1026 | * @start: Block nr Start of journal. | |
1027 | * @len: Length of the journal in blocks. | |
1028 | * @blocksize: blocksize of journalling device | |
5648ba5b RD |
1029 | * |
1030 | * Returns: a newly created journal_t * | |
470decc6 | 1031 | * |
f7f4bccb | 1032 | * jbd2_journal_init_dev creates a journal which maps a fixed contiguous |
470decc6 DK |
1033 | * range of blocks on an arbitrary block device. |
1034 | * | |
1035 | */ | |
f7f4bccb | 1036 | journal_t * jbd2_journal_init_dev(struct block_device *bdev, |
470decc6 | 1037 | struct block_device *fs_dev, |
18eba7aa | 1038 | unsigned long long start, int len, int blocksize) |
470decc6 DK |
1039 | { |
1040 | journal_t *journal = journal_init_common(); | |
1041 | struct buffer_head *bh; | |
05496769 | 1042 | char *p; |
470decc6 DK |
1043 | int n; |
1044 | ||
1045 | if (!journal) | |
1046 | return NULL; | |
1047 | ||
1048 | /* journal descriptor can store up to n blocks -bzzz */ | |
1049 | journal->j_blocksize = blocksize; | |
0587aa3d | 1050 | journal->j_dev = bdev; |
1051 | journal->j_fs_dev = fs_dev; | |
1052 | journal->j_blk_offset = start; | |
1053 | journal->j_maxlen = len; | |
1054 | bdevname(journal->j_dev, journal->j_devname); | |
1055 | p = journal->j_devname; | |
1056 | while ((p = strchr(p, '/'))) | |
1057 | *p = '!'; | |
4b905671 | 1058 | jbd2_stats_proc_init(journal); |
470decc6 DK |
1059 | n = journal->j_blocksize / sizeof(journal_block_tag_t); |
1060 | journal->j_wbufsize = n; | |
1061 | journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); | |
1062 | if (!journal->j_wbuf) { | |
25985edc | 1063 | printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n", |
329d291f | 1064 | __func__); |
4b905671 | 1065 | goto out_err; |
470decc6 | 1066 | } |
470decc6 DK |
1067 | |
1068 | bh = __getblk(journal->j_dev, start, journal->j_blocksize); | |
4b905671 JK |
1069 | if (!bh) { |
1070 | printk(KERN_ERR | |
1071 | "%s: Cannot get buffer for journal superblock\n", | |
1072 | __func__); | |
1073 | goto out_err; | |
1074 | } | |
470decc6 DK |
1075 | journal->j_sb_buffer = bh; |
1076 | journal->j_superblock = (journal_superblock_t *)bh->b_data; | |
4b905671 | 1077 | |
470decc6 | 1078 | return journal; |
4b905671 | 1079 | out_err: |
7b02bec0 | 1080 | kfree(journal->j_wbuf); |
4b905671 JK |
1081 | jbd2_stats_proc_exit(journal); |
1082 | kfree(journal); | |
1083 | return NULL; | |
470decc6 DK |
1084 | } |
1085 | ||
1086 | /** | |
f7f4bccb | 1087 | * journal_t * jbd2_journal_init_inode () - creates a journal which maps to a inode. |
470decc6 DK |
1088 | * @inode: An inode to create the journal in |
1089 | * | |
f7f4bccb | 1090 | * jbd2_journal_init_inode creates a journal which maps an on-disk inode as |
470decc6 DK |
1091 | * the journal. The inode must exist already, must support bmap() and |
1092 | * must have all data blocks preallocated. | |
1093 | */ | |
f7f4bccb | 1094 | journal_t * jbd2_journal_init_inode (struct inode *inode) |
470decc6 DK |
1095 | { |
1096 | struct buffer_head *bh; | |
1097 | journal_t *journal = journal_init_common(); | |
05496769 | 1098 | char *p; |
470decc6 DK |
1099 | int err; |
1100 | int n; | |
18eba7aa | 1101 | unsigned long long blocknr; |
470decc6 DK |
1102 | |
1103 | if (!journal) | |
1104 | return NULL; | |
1105 | ||
1106 | journal->j_dev = journal->j_fs_dev = inode->i_sb->s_bdev; | |
1107 | journal->j_inode = inode; | |
05496769 TT |
1108 | bdevname(journal->j_dev, journal->j_devname); |
1109 | p = journal->j_devname; | |
1110 | while ((p = strchr(p, '/'))) | |
1111 | *p = '!'; | |
1112 | p = journal->j_devname + strlen(journal->j_devname); | |
90576c0b | 1113 | sprintf(p, "-%lu", journal->j_inode->i_ino); |
470decc6 DK |
1114 | jbd_debug(1, |
1115 | "journal %p: inode %s/%ld, size %Ld, bits %d, blksize %ld\n", | |
1116 | journal, inode->i_sb->s_id, inode->i_ino, | |
1117 | (long long) inode->i_size, | |
1118 | inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize); | |
1119 | ||
1120 | journal->j_maxlen = inode->i_size >> inode->i_sb->s_blocksize_bits; | |
1121 | journal->j_blocksize = inode->i_sb->s_blocksize; | |
8e85fb3f | 1122 | jbd2_stats_proc_init(journal); |
470decc6 DK |
1123 | |
1124 | /* journal descriptor can store up to n blocks -bzzz */ | |
1125 | n = journal->j_blocksize / sizeof(journal_block_tag_t); | |
1126 | journal->j_wbufsize = n; | |
1127 | journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); | |
1128 | if (!journal->j_wbuf) { | |
25985edc | 1129 | printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n", |
329d291f | 1130 | __func__); |
4b905671 | 1131 | goto out_err; |
470decc6 DK |
1132 | } |
1133 | ||
f7f4bccb | 1134 | err = jbd2_journal_bmap(journal, 0, &blocknr); |
470decc6 DK |
1135 | /* If that failed, give up */ |
1136 | if (err) { | |
3c26bdb4 | 1137 | printk(KERN_ERR "%s: Cannot locate journal superblock\n", |
329d291f | 1138 | __func__); |
4b905671 | 1139 | goto out_err; |
470decc6 DK |
1140 | } |
1141 | ||
1142 | bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); | |
4b905671 JK |
1143 | if (!bh) { |
1144 | printk(KERN_ERR | |
1145 | "%s: Cannot get buffer for journal superblock\n", | |
1146 | __func__); | |
1147 | goto out_err; | |
1148 | } | |
470decc6 DK |
1149 | journal->j_sb_buffer = bh; |
1150 | journal->j_superblock = (journal_superblock_t *)bh->b_data; | |
1151 | ||
1152 | return journal; | |
4b905671 | 1153 | out_err: |
7b02bec0 | 1154 | kfree(journal->j_wbuf); |
4b905671 JK |
1155 | jbd2_stats_proc_exit(journal); |
1156 | kfree(journal); | |
1157 | return NULL; | |
470decc6 DK |
1158 | } |
1159 | ||
1160 | /* | |
1161 | * If the journal init or create aborts, we need to mark the journal | |
1162 | * superblock as being NULL to prevent the journal destroy from writing | |
1163 | * back a bogus superblock. | |
1164 | */ | |
1165 | static void journal_fail_superblock (journal_t *journal) | |
1166 | { | |
1167 | struct buffer_head *bh = journal->j_sb_buffer; | |
1168 | brelse(bh); | |
1169 | journal->j_sb_buffer = NULL; | |
1170 | } | |
1171 | ||
1172 | /* | |
1173 | * Given a journal_t structure, initialise the various fields for | |
1174 | * startup of a new journaling session. We use this both when creating | |
1175 | * a journal, and after recovering an old journal to reset it for | |
1176 | * subsequent use. | |
1177 | */ | |
1178 | ||
1179 | static int journal_reset(journal_t *journal) | |
1180 | { | |
1181 | journal_superblock_t *sb = journal->j_superblock; | |
18eba7aa | 1182 | unsigned long long first, last; |
470decc6 DK |
1183 | |
1184 | first = be32_to_cpu(sb->s_first); | |
1185 | last = be32_to_cpu(sb->s_maxlen); | |
f6f50e28 | 1186 | if (first + JBD2_MIN_JOURNAL_BLOCKS > last + 1) { |
f2a44523 | 1187 | printk(KERN_ERR "JBD2: Journal too short (blocks %llu-%llu).\n", |
f6f50e28 JK |
1188 | first, last); |
1189 | journal_fail_superblock(journal); | |
1190 | return -EINVAL; | |
1191 | } | |
470decc6 DK |
1192 | |
1193 | journal->j_first = first; | |
1194 | journal->j_last = last; | |
1195 | ||
1196 | journal->j_head = first; | |
1197 | journal->j_tail = first; | |
1198 | journal->j_free = last - first; | |
1199 | ||
1200 | journal->j_tail_sequence = journal->j_transaction_sequence; | |
1201 | journal->j_commit_sequence = journal->j_transaction_sequence - 1; | |
1202 | journal->j_commit_request = journal->j_commit_sequence; | |
1203 | ||
1204 | journal->j_max_transaction_buffers = journal->j_maxlen / 4; | |
1205 | ||
470decc6 DK |
1206 | /* |
1207 | * As a special case, if the on-disk copy is already marked as needing | |
24bcc89c JK |
1208 | * no recovery (s_start == 0), then we can safely defer the superblock |
1209 | * update until the next commit by setting JBD2_FLUSHED. This avoids | |
470decc6 DK |
1210 | * attempting a write to a potential-readonly device. |
1211 | */ | |
24bcc89c | 1212 | if (sb->s_start == 0) { |
f2a44523 | 1213 | jbd_debug(1, "JBD2: Skipping superblock update on recovered sb " |
470decc6 DK |
1214 | "(start %ld, seq %d, errno %d)\n", |
1215 | journal->j_tail, journal->j_tail_sequence, | |
1216 | journal->j_errno); | |
24bcc89c JK |
1217 | journal->j_flags |= JBD2_FLUSHED; |
1218 | } else { | |
a78bb11d JK |
1219 | /* Lock here to make assertions happy... */ |
1220 | mutex_lock(&journal->j_checkpoint_mutex); | |
79feb521 JK |
1221 | /* |
1222 | * Update log tail information. We use WRITE_FUA since new | |
1223 | * transaction will start reusing journal space and so we | |
1224 | * must make sure information about current log tail is on | |
1225 | * disk before that. | |
1226 | */ | |
1227 | jbd2_journal_update_sb_log_tail(journal, | |
1228 | journal->j_tail_sequence, | |
1229 | journal->j_tail, | |
1230 | WRITE_FUA); | |
a78bb11d | 1231 | mutex_unlock(&journal->j_checkpoint_mutex); |
470decc6 | 1232 | } |
24bcc89c JK |
1233 | return jbd2_journal_start_thread(journal); |
1234 | } | |
470decc6 | 1235 | |
79feb521 | 1236 | static void jbd2_write_superblock(journal_t *journal, int write_op) |
24bcc89c JK |
1237 | { |
1238 | struct buffer_head *bh = journal->j_sb_buffer; | |
79feb521 | 1239 | int ret; |
470decc6 | 1240 | |
79feb521 JK |
1241 | trace_jbd2_write_superblock(journal, write_op); |
1242 | if (!(journal->j_flags & JBD2_BARRIER)) | |
1243 | write_op &= ~(REQ_FUA | REQ_FLUSH); | |
1244 | lock_buffer(bh); | |
914258bf TT |
1245 | if (buffer_write_io_error(bh)) { |
1246 | /* | |
1247 | * Oh, dear. A previous attempt to write the journal | |
1248 | * superblock failed. This could happen because the | |
1249 | * USB device was yanked out. Or it could happen to | |
1250 | * be a transient write error and maybe the block will | |
1251 | * be remapped. Nothing we can do but to retry the | |
1252 | * write and hope for the best. | |
1253 | */ | |
1254 | printk(KERN_ERR "JBD2: previous I/O error detected " | |
1255 | "for journal superblock update for %s.\n", | |
1256 | journal->j_devname); | |
1257 | clear_buffer_write_io_error(bh); | |
1258 | set_buffer_uptodate(bh); | |
1259 | } | |
79feb521 JK |
1260 | get_bh(bh); |
1261 | bh->b_end_io = end_buffer_write_sync; | |
1262 | ret = submit_bh(write_op, bh); | |
1263 | wait_on_buffer(bh); | |
24bcc89c | 1264 | if (buffer_write_io_error(bh)) { |
24bcc89c JK |
1265 | clear_buffer_write_io_error(bh); |
1266 | set_buffer_uptodate(bh); | |
79feb521 JK |
1267 | ret = -EIO; |
1268 | } | |
1269 | if (ret) { | |
1270 | printk(KERN_ERR "JBD2: Error %d detected when updating " | |
1271 | "journal superblock for %s.\n", ret, | |
1272 | journal->j_devname); | |
24bcc89c JK |
1273 | } |
1274 | } | |
1275 | ||
1276 | /** | |
1277 | * jbd2_journal_update_sb_log_tail() - Update log tail in journal sb on disk. | |
1278 | * @journal: The journal to update. | |
79feb521 JK |
1279 | * @tail_tid: TID of the new transaction at the tail of the log |
1280 | * @tail_block: The first block of the transaction at the tail of the log | |
1281 | * @write_op: With which operation should we write the journal sb | |
24bcc89c JK |
1282 | * |
1283 | * Update a journal's superblock information about log tail and write it to | |
1284 | * disk, waiting for the IO to complete. | |
1285 | */ | |
79feb521 JK |
1286 | void jbd2_journal_update_sb_log_tail(journal_t *journal, tid_t tail_tid, |
1287 | unsigned long tail_block, int write_op) | |
24bcc89c JK |
1288 | { |
1289 | journal_superblock_t *sb = journal->j_superblock; | |
1290 | ||
a78bb11d | 1291 | BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); |
79feb521 JK |
1292 | jbd_debug(1, "JBD2: updating superblock (start %lu, seq %u)\n", |
1293 | tail_block, tail_tid); | |
470decc6 | 1294 | |
79feb521 JK |
1295 | sb->s_sequence = cpu_to_be32(tail_tid); |
1296 | sb->s_start = cpu_to_be32(tail_block); | |
470decc6 | 1297 | |
79feb521 | 1298 | jbd2_write_superblock(journal, write_op); |
470decc6 | 1299 | |
24bcc89c JK |
1300 | /* Log is no longer empty */ |
1301 | write_lock(&journal->j_state_lock); | |
1302 | WARN_ON(!sb->s_sequence); | |
1303 | journal->j_flags &= ~JBD2_FLUSHED; | |
1304 | write_unlock(&journal->j_state_lock); | |
1305 | } | |
2201c590 | 1306 | |
24bcc89c JK |
1307 | /** |
1308 | * jbd2_mark_journal_empty() - Mark on disk journal as empty. | |
1309 | * @journal: The journal to update. | |
1310 | * | |
1311 | * Update a journal's dynamic superblock fields to show that journal is empty. | |
1312 | * Write updated superblock to disk waiting for IO to complete. | |
1313 | */ | |
1314 | static void jbd2_mark_journal_empty(journal_t *journal) | |
1315 | { | |
1316 | journal_superblock_t *sb = journal->j_superblock; | |
914258bf | 1317 | |
a78bb11d | 1318 | BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); |
a931da6a | 1319 | read_lock(&journal->j_state_lock); |
24bcc89c JK |
1320 | jbd_debug(1, "JBD2: Marking journal as empty (seq %d)\n", |
1321 | journal->j_tail_sequence); | |
470decc6 DK |
1322 | |
1323 | sb->s_sequence = cpu_to_be32(journal->j_tail_sequence); | |
24bcc89c | 1324 | sb->s_start = cpu_to_be32(0); |
a931da6a | 1325 | read_unlock(&journal->j_state_lock); |
470decc6 | 1326 | |
79feb521 | 1327 | jbd2_write_superblock(journal, WRITE_FUA); |
470decc6 | 1328 | |
24bcc89c | 1329 | /* Log is no longer empty */ |
a931da6a | 1330 | write_lock(&journal->j_state_lock); |
24bcc89c | 1331 | journal->j_flags |= JBD2_FLUSHED; |
a931da6a | 1332 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
1333 | } |
1334 | ||
24bcc89c JK |
1335 | |
1336 | /** | |
1337 | * jbd2_journal_update_sb_errno() - Update error in the journal. | |
1338 | * @journal: The journal to update. | |
1339 | * | |
1340 | * Update a journal's errno. Write updated superblock to disk waiting for IO | |
1341 | * to complete. | |
1342 | */ | |
1343 | static void jbd2_journal_update_sb_errno(journal_t *journal) | |
1344 | { | |
1345 | journal_superblock_t *sb = journal->j_superblock; | |
1346 | ||
1347 | read_lock(&journal->j_state_lock); | |
1348 | jbd_debug(1, "JBD2: updating superblock error (errno %d)\n", | |
1349 | journal->j_errno); | |
1350 | sb->s_errno = cpu_to_be32(journal->j_errno); | |
1351 | read_unlock(&journal->j_state_lock); | |
1352 | ||
79feb521 | 1353 | jbd2_write_superblock(journal, WRITE_SYNC); |
24bcc89c JK |
1354 | } |
1355 | ||
470decc6 DK |
1356 | /* |
1357 | * Read the superblock for a given journal, performing initial | |
1358 | * validation of the format. | |
1359 | */ | |
470decc6 DK |
1360 | static int journal_get_superblock(journal_t *journal) |
1361 | { | |
1362 | struct buffer_head *bh; | |
1363 | journal_superblock_t *sb; | |
1364 | int err = -EIO; | |
1365 | ||
1366 | bh = journal->j_sb_buffer; | |
1367 | ||
1368 | J_ASSERT(bh != NULL); | |
1369 | if (!buffer_uptodate(bh)) { | |
1370 | ll_rw_block(READ, 1, &bh); | |
1371 | wait_on_buffer(bh); | |
1372 | if (!buffer_uptodate(bh)) { | |
f2a44523 EG |
1373 | printk(KERN_ERR |
1374 | "JBD2: IO error reading journal superblock\n"); | |
470decc6 DK |
1375 | goto out; |
1376 | } | |
1377 | } | |
1378 | ||
1379 | sb = journal->j_superblock; | |
1380 | ||
1381 | err = -EINVAL; | |
1382 | ||
f7f4bccb | 1383 | if (sb->s_header.h_magic != cpu_to_be32(JBD2_MAGIC_NUMBER) || |
470decc6 | 1384 | sb->s_blocksize != cpu_to_be32(journal->j_blocksize)) { |
f2a44523 | 1385 | printk(KERN_WARNING "JBD2: no valid journal superblock found\n"); |
470decc6 DK |
1386 | goto out; |
1387 | } | |
1388 | ||
1389 | switch(be32_to_cpu(sb->s_header.h_blocktype)) { | |
f7f4bccb | 1390 | case JBD2_SUPERBLOCK_V1: |
470decc6 DK |
1391 | journal->j_format_version = 1; |
1392 | break; | |
f7f4bccb | 1393 | case JBD2_SUPERBLOCK_V2: |
470decc6 DK |
1394 | journal->j_format_version = 2; |
1395 | break; | |
1396 | default: | |
f2a44523 | 1397 | printk(KERN_WARNING "JBD2: unrecognised superblock format ID\n"); |
470decc6 DK |
1398 | goto out; |
1399 | } | |
1400 | ||
1401 | if (be32_to_cpu(sb->s_maxlen) < journal->j_maxlen) | |
1402 | journal->j_maxlen = be32_to_cpu(sb->s_maxlen); | |
1403 | else if (be32_to_cpu(sb->s_maxlen) > journal->j_maxlen) { | |
f2a44523 | 1404 | printk(KERN_WARNING "JBD2: journal file too short\n"); |
470decc6 DK |
1405 | goto out; |
1406 | } | |
1407 | ||
8762202d EG |
1408 | if (be32_to_cpu(sb->s_first) == 0 || |
1409 | be32_to_cpu(sb->s_first) >= journal->j_maxlen) { | |
1410 | printk(KERN_WARNING | |
1411 | "JBD2: Invalid start block of journal: %u\n", | |
1412 | be32_to_cpu(sb->s_first)); | |
1413 | goto out; | |
1414 | } | |
1415 | ||
470decc6 DK |
1416 | return 0; |
1417 | ||
1418 | out: | |
1419 | journal_fail_superblock(journal); | |
1420 | return err; | |
1421 | } | |
1422 | ||
1423 | /* | |
1424 | * Load the on-disk journal superblock and read the key fields into the | |
1425 | * journal_t. | |
1426 | */ | |
1427 | ||
1428 | static int load_superblock(journal_t *journal) | |
1429 | { | |
1430 | int err; | |
1431 | journal_superblock_t *sb; | |
1432 | ||
1433 | err = journal_get_superblock(journal); | |
1434 | if (err) | |
1435 | return err; | |
1436 | ||
1437 | sb = journal->j_superblock; | |
1438 | ||
1439 | journal->j_tail_sequence = be32_to_cpu(sb->s_sequence); | |
1440 | journal->j_tail = be32_to_cpu(sb->s_start); | |
1441 | journal->j_first = be32_to_cpu(sb->s_first); | |
1442 | journal->j_last = be32_to_cpu(sb->s_maxlen); | |
1443 | journal->j_errno = be32_to_cpu(sb->s_errno); | |
1444 | ||
1445 | return 0; | |
1446 | } | |
1447 | ||
1448 | ||
1449 | /** | |
f7f4bccb | 1450 | * int jbd2_journal_load() - Read journal from disk. |
470decc6 DK |
1451 | * @journal: Journal to act on. |
1452 | * | |
1453 | * Given a journal_t structure which tells us which disk blocks contain | |
1454 | * a journal, read the journal from disk to initialise the in-memory | |
1455 | * structures. | |
1456 | */ | |
f7f4bccb | 1457 | int jbd2_journal_load(journal_t *journal) |
470decc6 DK |
1458 | { |
1459 | int err; | |
1460 | journal_superblock_t *sb; | |
1461 | ||
1462 | err = load_superblock(journal); | |
1463 | if (err) | |
1464 | return err; | |
1465 | ||
1466 | sb = journal->j_superblock; | |
1467 | /* If this is a V2 superblock, then we have to check the | |
1468 | * features flags on it. */ | |
1469 | ||
1470 | if (journal->j_format_version >= 2) { | |
1471 | if ((sb->s_feature_ro_compat & | |
f7f4bccb | 1472 | ~cpu_to_be32(JBD2_KNOWN_ROCOMPAT_FEATURES)) || |
470decc6 | 1473 | (sb->s_feature_incompat & |
f7f4bccb | 1474 | ~cpu_to_be32(JBD2_KNOWN_INCOMPAT_FEATURES))) { |
f2a44523 EG |
1475 | printk(KERN_WARNING |
1476 | "JBD2: Unrecognised features on journal\n"); | |
470decc6 DK |
1477 | return -EINVAL; |
1478 | } | |
1479 | } | |
1480 | ||
d2eecb03 TT |
1481 | /* |
1482 | * Create a slab for this blocksize | |
1483 | */ | |
1484 | err = jbd2_journal_create_slab(be32_to_cpu(sb->s_blocksize)); | |
1485 | if (err) | |
1486 | return err; | |
1487 | ||
470decc6 DK |
1488 | /* Let the recovery code check whether it needs to recover any |
1489 | * data from the journal. */ | |
f7f4bccb | 1490 | if (jbd2_journal_recover(journal)) |
470decc6 DK |
1491 | goto recovery_error; |
1492 | ||
e6a47428 TT |
1493 | if (journal->j_failed_commit) { |
1494 | printk(KERN_ERR "JBD2: journal transaction %u on %s " | |
1495 | "is corrupt.\n", journal->j_failed_commit, | |
1496 | journal->j_devname); | |
1497 | return -EIO; | |
1498 | } | |
1499 | ||
470decc6 DK |
1500 | /* OK, we've finished with the dynamic journal bits: |
1501 | * reinitialise the dynamic contents of the superblock in memory | |
1502 | * and reset them on disk. */ | |
1503 | if (journal_reset(journal)) | |
1504 | goto recovery_error; | |
1505 | ||
f7f4bccb MC |
1506 | journal->j_flags &= ~JBD2_ABORT; |
1507 | journal->j_flags |= JBD2_LOADED; | |
470decc6 DK |
1508 | return 0; |
1509 | ||
1510 | recovery_error: | |
f2a44523 | 1511 | printk(KERN_WARNING "JBD2: recovery failed\n"); |
470decc6 DK |
1512 | return -EIO; |
1513 | } | |
1514 | ||
1515 | /** | |
f7f4bccb | 1516 | * void jbd2_journal_destroy() - Release a journal_t structure. |
470decc6 DK |
1517 | * @journal: Journal to act on. |
1518 | * | |
1519 | * Release a journal_t structure once it is no longer in use by the | |
1520 | * journaled object. | |
44519faf | 1521 | * Return <0 if we couldn't clean up the journal. |
470decc6 | 1522 | */ |
44519faf | 1523 | int jbd2_journal_destroy(journal_t *journal) |
470decc6 | 1524 | { |
44519faf HK |
1525 | int err = 0; |
1526 | ||
470decc6 DK |
1527 | /* Wait for the commit thread to wake up and die. */ |
1528 | journal_kill_thread(journal); | |
1529 | ||
1530 | /* Force a final log commit */ | |
1531 | if (journal->j_running_transaction) | |
f7f4bccb | 1532 | jbd2_journal_commit_transaction(journal); |
470decc6 DK |
1533 | |
1534 | /* Force any old transactions to disk */ | |
1535 | ||
1536 | /* Totally anal locking here... */ | |
1537 | spin_lock(&journal->j_list_lock); | |
1538 | while (journal->j_checkpoint_transactions != NULL) { | |
1539 | spin_unlock(&journal->j_list_lock); | |
1a0d3786 | 1540 | mutex_lock(&journal->j_checkpoint_mutex); |
f7f4bccb | 1541 | jbd2_log_do_checkpoint(journal); |
1a0d3786 | 1542 | mutex_unlock(&journal->j_checkpoint_mutex); |
470decc6 DK |
1543 | spin_lock(&journal->j_list_lock); |
1544 | } | |
1545 | ||
1546 | J_ASSERT(journal->j_running_transaction == NULL); | |
1547 | J_ASSERT(journal->j_committing_transaction == NULL); | |
1548 | J_ASSERT(journal->j_checkpoint_transactions == NULL); | |
1549 | spin_unlock(&journal->j_list_lock); | |
1550 | ||
470decc6 | 1551 | if (journal->j_sb_buffer) { |
44519faf | 1552 | if (!is_journal_aborted(journal)) { |
a78bb11d | 1553 | mutex_lock(&journal->j_checkpoint_mutex); |
24bcc89c | 1554 | jbd2_mark_journal_empty(journal); |
a78bb11d JK |
1555 | mutex_unlock(&journal->j_checkpoint_mutex); |
1556 | } else | |
44519faf | 1557 | err = -EIO; |
470decc6 DK |
1558 | brelse(journal->j_sb_buffer); |
1559 | } | |
1560 | ||
8e85fb3f JL |
1561 | if (journal->j_proc_entry) |
1562 | jbd2_stats_proc_exit(journal); | |
470decc6 DK |
1563 | if (journal->j_inode) |
1564 | iput(journal->j_inode); | |
1565 | if (journal->j_revoke) | |
f7f4bccb | 1566 | jbd2_journal_destroy_revoke(journal); |
470decc6 DK |
1567 | kfree(journal->j_wbuf); |
1568 | kfree(journal); | |
44519faf HK |
1569 | |
1570 | return err; | |
470decc6 DK |
1571 | } |
1572 | ||
1573 | ||
1574 | /** | |
f7f4bccb | 1575 | *int jbd2_journal_check_used_features () - Check if features specified are used. |
470decc6 DK |
1576 | * @journal: Journal to check. |
1577 | * @compat: bitmask of compatible features | |
1578 | * @ro: bitmask of features that force read-only mount | |
1579 | * @incompat: bitmask of incompatible features | |
1580 | * | |
1581 | * Check whether the journal uses all of a given set of | |
1582 | * features. Return true (non-zero) if it does. | |
1583 | **/ | |
1584 | ||
f7f4bccb | 1585 | int jbd2_journal_check_used_features (journal_t *journal, unsigned long compat, |
470decc6 DK |
1586 | unsigned long ro, unsigned long incompat) |
1587 | { | |
1588 | journal_superblock_t *sb; | |
1589 | ||
1590 | if (!compat && !ro && !incompat) | |
1591 | return 1; | |
1113e1b5 PL |
1592 | /* Load journal superblock if it is not loaded yet. */ |
1593 | if (journal->j_format_version == 0 && | |
1594 | journal_get_superblock(journal) != 0) | |
1595 | return 0; | |
470decc6 DK |
1596 | if (journal->j_format_version == 1) |
1597 | return 0; | |
1598 | ||
1599 | sb = journal->j_superblock; | |
1600 | ||
1601 | if (((be32_to_cpu(sb->s_feature_compat) & compat) == compat) && | |
1602 | ((be32_to_cpu(sb->s_feature_ro_compat) & ro) == ro) && | |
1603 | ((be32_to_cpu(sb->s_feature_incompat) & incompat) == incompat)) | |
1604 | return 1; | |
1605 | ||
1606 | return 0; | |
1607 | } | |
1608 | ||
1609 | /** | |
f7f4bccb | 1610 | * int jbd2_journal_check_available_features() - Check feature set in journalling layer |
470decc6 DK |
1611 | * @journal: Journal to check. |
1612 | * @compat: bitmask of compatible features | |
1613 | * @ro: bitmask of features that force read-only mount | |
1614 | * @incompat: bitmask of incompatible features | |
1615 | * | |
1616 | * Check whether the journaling code supports the use of | |
1617 | * all of a given set of features on this journal. Return true | |
1618 | * (non-zero) if it can. */ | |
1619 | ||
f7f4bccb | 1620 | int jbd2_journal_check_available_features (journal_t *journal, unsigned long compat, |
470decc6 DK |
1621 | unsigned long ro, unsigned long incompat) |
1622 | { | |
470decc6 DK |
1623 | if (!compat && !ro && !incompat) |
1624 | return 1; | |
1625 | ||
470decc6 DK |
1626 | /* We can support any known requested features iff the |
1627 | * superblock is in version 2. Otherwise we fail to support any | |
1628 | * extended sb features. */ | |
1629 | ||
1630 | if (journal->j_format_version != 2) | |
1631 | return 0; | |
1632 | ||
f7f4bccb MC |
1633 | if ((compat & JBD2_KNOWN_COMPAT_FEATURES) == compat && |
1634 | (ro & JBD2_KNOWN_ROCOMPAT_FEATURES) == ro && | |
1635 | (incompat & JBD2_KNOWN_INCOMPAT_FEATURES) == incompat) | |
470decc6 DK |
1636 | return 1; |
1637 | ||
1638 | return 0; | |
1639 | } | |
1640 | ||
1641 | /** | |
f7f4bccb | 1642 | * int jbd2_journal_set_features () - Mark a given journal feature in the superblock |
470decc6 DK |
1643 | * @journal: Journal to act on. |
1644 | * @compat: bitmask of compatible features | |
1645 | * @ro: bitmask of features that force read-only mount | |
1646 | * @incompat: bitmask of incompatible features | |
1647 | * | |
1648 | * Mark a given journal feature as present on the | |
1649 | * superblock. Returns true if the requested features could be set. | |
1650 | * | |
1651 | */ | |
1652 | ||
f7f4bccb | 1653 | int jbd2_journal_set_features (journal_t *journal, unsigned long compat, |
470decc6 DK |
1654 | unsigned long ro, unsigned long incompat) |
1655 | { | |
1656 | journal_superblock_t *sb; | |
1657 | ||
f7f4bccb | 1658 | if (jbd2_journal_check_used_features(journal, compat, ro, incompat)) |
470decc6 DK |
1659 | return 1; |
1660 | ||
f7f4bccb | 1661 | if (!jbd2_journal_check_available_features(journal, compat, ro, incompat)) |
470decc6 DK |
1662 | return 0; |
1663 | ||
1664 | jbd_debug(1, "Setting new features 0x%lx/0x%lx/0x%lx\n", | |
1665 | compat, ro, incompat); | |
1666 | ||
1667 | sb = journal->j_superblock; | |
1668 | ||
1669 | sb->s_feature_compat |= cpu_to_be32(compat); | |
1670 | sb->s_feature_ro_compat |= cpu_to_be32(ro); | |
1671 | sb->s_feature_incompat |= cpu_to_be32(incompat); | |
1672 | ||
1673 | return 1; | |
1674 | } | |
1675 | ||
818d276c GS |
1676 | /* |
1677 | * jbd2_journal_clear_features () - Clear a given journal feature in the | |
1678 | * superblock | |
1679 | * @journal: Journal to act on. | |
1680 | * @compat: bitmask of compatible features | |
1681 | * @ro: bitmask of features that force read-only mount | |
1682 | * @incompat: bitmask of incompatible features | |
1683 | * | |
1684 | * Clear a given journal feature as present on the | |
1685 | * superblock. | |
1686 | */ | |
1687 | void jbd2_journal_clear_features(journal_t *journal, unsigned long compat, | |
1688 | unsigned long ro, unsigned long incompat) | |
1689 | { | |
1690 | journal_superblock_t *sb; | |
1691 | ||
1692 | jbd_debug(1, "Clear features 0x%lx/0x%lx/0x%lx\n", | |
1693 | compat, ro, incompat); | |
1694 | ||
1695 | sb = journal->j_superblock; | |
1696 | ||
1697 | sb->s_feature_compat &= ~cpu_to_be32(compat); | |
1698 | sb->s_feature_ro_compat &= ~cpu_to_be32(ro); | |
1699 | sb->s_feature_incompat &= ~cpu_to_be32(incompat); | |
1700 | } | |
1701 | EXPORT_SYMBOL(jbd2_journal_clear_features); | |
470decc6 | 1702 | |
470decc6 | 1703 | /** |
f7f4bccb | 1704 | * int jbd2_journal_flush () - Flush journal |
470decc6 DK |
1705 | * @journal: Journal to act on. |
1706 | * | |
1707 | * Flush all data for a given journal to disk and empty the journal. | |
1708 | * Filesystems can use this when remounting readonly to ensure that | |
1709 | * recovery does not need to happen on remount. | |
1710 | */ | |
1711 | ||
f7f4bccb | 1712 | int jbd2_journal_flush(journal_t *journal) |
470decc6 DK |
1713 | { |
1714 | int err = 0; | |
1715 | transaction_t *transaction = NULL; | |
470decc6 | 1716 | |
a931da6a | 1717 | write_lock(&journal->j_state_lock); |
470decc6 DK |
1718 | |
1719 | /* Force everything buffered to the log... */ | |
1720 | if (journal->j_running_transaction) { | |
1721 | transaction = journal->j_running_transaction; | |
f7f4bccb | 1722 | __jbd2_log_start_commit(journal, transaction->t_tid); |
470decc6 DK |
1723 | } else if (journal->j_committing_transaction) |
1724 | transaction = journal->j_committing_transaction; | |
1725 | ||
1726 | /* Wait for the log commit to complete... */ | |
1727 | if (transaction) { | |
1728 | tid_t tid = transaction->t_tid; | |
1729 | ||
a931da6a | 1730 | write_unlock(&journal->j_state_lock); |
f7f4bccb | 1731 | jbd2_log_wait_commit(journal, tid); |
470decc6 | 1732 | } else { |
a931da6a | 1733 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
1734 | } |
1735 | ||
1736 | /* ...and flush everything in the log out to disk. */ | |
1737 | spin_lock(&journal->j_list_lock); | |
1738 | while (!err && journal->j_checkpoint_transactions != NULL) { | |
1739 | spin_unlock(&journal->j_list_lock); | |
44519faf | 1740 | mutex_lock(&journal->j_checkpoint_mutex); |
f7f4bccb | 1741 | err = jbd2_log_do_checkpoint(journal); |
44519faf | 1742 | mutex_unlock(&journal->j_checkpoint_mutex); |
470decc6 DK |
1743 | spin_lock(&journal->j_list_lock); |
1744 | } | |
1745 | spin_unlock(&journal->j_list_lock); | |
44519faf HK |
1746 | |
1747 | if (is_journal_aborted(journal)) | |
1748 | return -EIO; | |
1749 | ||
a78bb11d | 1750 | mutex_lock(&journal->j_checkpoint_mutex); |
f7f4bccb | 1751 | jbd2_cleanup_journal_tail(journal); |
470decc6 DK |
1752 | |
1753 | /* Finally, mark the journal as really needing no recovery. | |
1754 | * This sets s_start==0 in the underlying superblock, which is | |
1755 | * the magic code for a fully-recovered superblock. Any future | |
1756 | * commits of data to the journal will restore the current | |
1757 | * s_start value. */ | |
24bcc89c | 1758 | jbd2_mark_journal_empty(journal); |
a78bb11d | 1759 | mutex_unlock(&journal->j_checkpoint_mutex); |
a931da6a | 1760 | write_lock(&journal->j_state_lock); |
470decc6 DK |
1761 | J_ASSERT(!journal->j_running_transaction); |
1762 | J_ASSERT(!journal->j_committing_transaction); | |
1763 | J_ASSERT(!journal->j_checkpoint_transactions); | |
1764 | J_ASSERT(journal->j_head == journal->j_tail); | |
1765 | J_ASSERT(journal->j_tail_sequence == journal->j_transaction_sequence); | |
a931da6a | 1766 | write_unlock(&journal->j_state_lock); |
44519faf | 1767 | return 0; |
470decc6 DK |
1768 | } |
1769 | ||
1770 | /** | |
f7f4bccb | 1771 | * int jbd2_journal_wipe() - Wipe journal contents |
470decc6 DK |
1772 | * @journal: Journal to act on. |
1773 | * @write: flag (see below) | |
1774 | * | |
1775 | * Wipe out all of the contents of a journal, safely. This will produce | |
1776 | * a warning if the journal contains any valid recovery information. | |
f7f4bccb | 1777 | * Must be called between journal_init_*() and jbd2_journal_load(). |
470decc6 DK |
1778 | * |
1779 | * If 'write' is non-zero, then we wipe out the journal on disk; otherwise | |
1780 | * we merely suppress recovery. | |
1781 | */ | |
1782 | ||
f7f4bccb | 1783 | int jbd2_journal_wipe(journal_t *journal, int write) |
470decc6 | 1784 | { |
470decc6 DK |
1785 | int err = 0; |
1786 | ||
f7f4bccb | 1787 | J_ASSERT (!(journal->j_flags & JBD2_LOADED)); |
470decc6 DK |
1788 | |
1789 | err = load_superblock(journal); | |
1790 | if (err) | |
1791 | return err; | |
1792 | ||
470decc6 DK |
1793 | if (!journal->j_tail) |
1794 | goto no_recovery; | |
1795 | ||
f2a44523 | 1796 | printk(KERN_WARNING "JBD2: %s recovery information on journal\n", |
470decc6 DK |
1797 | write ? "Clearing" : "Ignoring"); |
1798 | ||
f7f4bccb | 1799 | err = jbd2_journal_skip_recovery(journal); |
a78bb11d JK |
1800 | if (write) { |
1801 | /* Lock to make assertions happy... */ | |
1802 | mutex_lock(&journal->j_checkpoint_mutex); | |
24bcc89c | 1803 | jbd2_mark_journal_empty(journal); |
a78bb11d JK |
1804 | mutex_unlock(&journal->j_checkpoint_mutex); |
1805 | } | |
470decc6 DK |
1806 | |
1807 | no_recovery: | |
1808 | return err; | |
1809 | } | |
1810 | ||
470decc6 DK |
1811 | /* |
1812 | * Journal abort has very specific semantics, which we describe | |
1813 | * for journal abort. | |
1814 | * | |
bfcd3555 | 1815 | * Two internal functions, which provide abort to the jbd layer |
470decc6 DK |
1816 | * itself are here. |
1817 | */ | |
1818 | ||
1819 | /* | |
1820 | * Quick version for internal journal use (doesn't lock the journal). | |
1821 | * Aborts hard --- we mark the abort as occurred, but do _nothing_ else, | |
1822 | * and don't attempt to make any other journal updates. | |
1823 | */ | |
f7f4bccb | 1824 | void __jbd2_journal_abort_hard(journal_t *journal) |
470decc6 DK |
1825 | { |
1826 | transaction_t *transaction; | |
470decc6 | 1827 | |
f7f4bccb | 1828 | if (journal->j_flags & JBD2_ABORT) |
470decc6 DK |
1829 | return; |
1830 | ||
1831 | printk(KERN_ERR "Aborting journal on device %s.\n", | |
05496769 | 1832 | journal->j_devname); |
470decc6 | 1833 | |
a931da6a | 1834 | write_lock(&journal->j_state_lock); |
f7f4bccb | 1835 | journal->j_flags |= JBD2_ABORT; |
470decc6 DK |
1836 | transaction = journal->j_running_transaction; |
1837 | if (transaction) | |
f7f4bccb | 1838 | __jbd2_log_start_commit(journal, transaction->t_tid); |
a931da6a | 1839 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
1840 | } |
1841 | ||
1842 | /* Soft abort: record the abort error status in the journal superblock, | |
1843 | * but don't do any other IO. */ | |
1844 | static void __journal_abort_soft (journal_t *journal, int errno) | |
1845 | { | |
f7f4bccb | 1846 | if (journal->j_flags & JBD2_ABORT) |
470decc6 DK |
1847 | return; |
1848 | ||
1849 | if (!journal->j_errno) | |
1850 | journal->j_errno = errno; | |
1851 | ||
f7f4bccb | 1852 | __jbd2_journal_abort_hard(journal); |
470decc6 DK |
1853 | |
1854 | if (errno) | |
24bcc89c | 1855 | jbd2_journal_update_sb_errno(journal); |
470decc6 DK |
1856 | } |
1857 | ||
1858 | /** | |
f7f4bccb | 1859 | * void jbd2_journal_abort () - Shutdown the journal immediately. |
470decc6 DK |
1860 | * @journal: the journal to shutdown. |
1861 | * @errno: an error number to record in the journal indicating | |
1862 | * the reason for the shutdown. | |
1863 | * | |
1864 | * Perform a complete, immediate shutdown of the ENTIRE | |
1865 | * journal (not of a single transaction). This operation cannot be | |
1866 | * undone without closing and reopening the journal. | |
1867 | * | |
f7f4bccb | 1868 | * The jbd2_journal_abort function is intended to support higher level error |
470decc6 DK |
1869 | * recovery mechanisms such as the ext2/ext3 remount-readonly error |
1870 | * mode. | |
1871 | * | |
1872 | * Journal abort has very specific semantics. Any existing dirty, | |
1873 | * unjournaled buffers in the main filesystem will still be written to | |
1874 | * disk by bdflush, but the journaling mechanism will be suspended | |
1875 | * immediately and no further transaction commits will be honoured. | |
1876 | * | |
1877 | * Any dirty, journaled buffers will be written back to disk without | |
1878 | * hitting the journal. Atomicity cannot be guaranteed on an aborted | |
1879 | * filesystem, but we _do_ attempt to leave as much data as possible | |
1880 | * behind for fsck to use for cleanup. | |
1881 | * | |
1882 | * Any attempt to get a new transaction handle on a journal which is in | |
1883 | * ABORT state will just result in an -EROFS error return. A | |
f7f4bccb | 1884 | * jbd2_journal_stop on an existing handle will return -EIO if we have |
470decc6 DK |
1885 | * entered abort state during the update. |
1886 | * | |
1887 | * Recursive transactions are not disturbed by journal abort until the | |
f7f4bccb | 1888 | * final jbd2_journal_stop, which will receive the -EIO error. |
470decc6 | 1889 | * |
f7f4bccb | 1890 | * Finally, the jbd2_journal_abort call allows the caller to supply an errno |
470decc6 DK |
1891 | * which will be recorded (if possible) in the journal superblock. This |
1892 | * allows a client to record failure conditions in the middle of a | |
1893 | * transaction without having to complete the transaction to record the | |
1894 | * failure to disk. ext3_error, for example, now uses this | |
1895 | * functionality. | |
1896 | * | |
1897 | * Errors which originate from within the journaling layer will NOT | |
1898 | * supply an errno; a null errno implies that absolutely no further | |
1899 | * writes are done to the journal (unless there are any already in | |
1900 | * progress). | |
1901 | * | |
1902 | */ | |
1903 | ||
f7f4bccb | 1904 | void jbd2_journal_abort(journal_t *journal, int errno) |
470decc6 DK |
1905 | { |
1906 | __journal_abort_soft(journal, errno); | |
1907 | } | |
1908 | ||
1909 | /** | |
f7f4bccb | 1910 | * int jbd2_journal_errno () - returns the journal's error state. |
470decc6 DK |
1911 | * @journal: journal to examine. |
1912 | * | |
bfcd3555 | 1913 | * This is the errno number set with jbd2_journal_abort(), the last |
470decc6 DK |
1914 | * time the journal was mounted - if the journal was stopped |
1915 | * without calling abort this will be 0. | |
1916 | * | |
1917 | * If the journal has been aborted on this mount time -EROFS will | |
1918 | * be returned. | |
1919 | */ | |
f7f4bccb | 1920 | int jbd2_journal_errno(journal_t *journal) |
470decc6 DK |
1921 | { |
1922 | int err; | |
1923 | ||
a931da6a | 1924 | read_lock(&journal->j_state_lock); |
f7f4bccb | 1925 | if (journal->j_flags & JBD2_ABORT) |
470decc6 DK |
1926 | err = -EROFS; |
1927 | else | |
1928 | err = journal->j_errno; | |
a931da6a | 1929 | read_unlock(&journal->j_state_lock); |
470decc6 DK |
1930 | return err; |
1931 | } | |
1932 | ||
1933 | /** | |
f7f4bccb | 1934 | * int jbd2_journal_clear_err () - clears the journal's error state |
470decc6 DK |
1935 | * @journal: journal to act on. |
1936 | * | |
bfcd3555 | 1937 | * An error must be cleared or acked to take a FS out of readonly |
470decc6 DK |
1938 | * mode. |
1939 | */ | |
f7f4bccb | 1940 | int jbd2_journal_clear_err(journal_t *journal) |
470decc6 DK |
1941 | { |
1942 | int err = 0; | |
1943 | ||
a931da6a | 1944 | write_lock(&journal->j_state_lock); |
f7f4bccb | 1945 | if (journal->j_flags & JBD2_ABORT) |
470decc6 DK |
1946 | err = -EROFS; |
1947 | else | |
1948 | journal->j_errno = 0; | |
a931da6a | 1949 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
1950 | return err; |
1951 | } | |
1952 | ||
1953 | /** | |
f7f4bccb | 1954 | * void jbd2_journal_ack_err() - Ack journal err. |
470decc6 DK |
1955 | * @journal: journal to act on. |
1956 | * | |
bfcd3555 | 1957 | * An error must be cleared or acked to take a FS out of readonly |
470decc6 DK |
1958 | * mode. |
1959 | */ | |
f7f4bccb | 1960 | void jbd2_journal_ack_err(journal_t *journal) |
470decc6 | 1961 | { |
a931da6a | 1962 | write_lock(&journal->j_state_lock); |
470decc6 | 1963 | if (journal->j_errno) |
f7f4bccb | 1964 | journal->j_flags |= JBD2_ACK_ERR; |
a931da6a | 1965 | write_unlock(&journal->j_state_lock); |
470decc6 DK |
1966 | } |
1967 | ||
f7f4bccb | 1968 | int jbd2_journal_blocks_per_page(struct inode *inode) |
470decc6 DK |
1969 | { |
1970 | return 1 << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); | |
1971 | } | |
1972 | ||
b517bea1 ZB |
1973 | /* |
1974 | * helper functions to deal with 32 or 64bit block numbers. | |
1975 | */ | |
1976 | size_t journal_tag_bytes(journal_t *journal) | |
1977 | { | |
1978 | if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT)) | |
cd02ff0b | 1979 | return JBD2_TAG_SIZE64; |
b517bea1 | 1980 | else |
cd02ff0b | 1981 | return JBD2_TAG_SIZE32; |
b517bea1 ZB |
1982 | } |
1983 | ||
d2eecb03 TT |
1984 | /* |
1985 | * JBD memory management | |
1986 | * | |
1987 | * These functions are used to allocate block-sized chunks of memory | |
1988 | * used for making copies of buffer_head data. Very often it will be | |
1989 | * page-sized chunks of data, but sometimes it will be in | |
1990 | * sub-page-size chunks. (For example, 16k pages on Power systems | |
1991 | * with a 4k block file system.) For blocks smaller than a page, we | |
1992 | * use a SLAB allocator. There are slab caches for each block size, | |
1993 | * which are allocated at mount time, if necessary, and we only free | |
1994 | * (all of) the slab caches when/if the jbd2 module is unloaded. For | |
1995 | * this reason we don't need to a mutex to protect access to | |
1996 | * jbd2_slab[] allocating or releasing memory; only in | |
1997 | * jbd2_journal_create_slab(). | |
1998 | */ | |
1999 | #define JBD2_MAX_SLABS 8 | |
2000 | static struct kmem_cache *jbd2_slab[JBD2_MAX_SLABS]; | |
d2eecb03 TT |
2001 | |
2002 | static const char *jbd2_slab_names[JBD2_MAX_SLABS] = { | |
2003 | "jbd2_1k", "jbd2_2k", "jbd2_4k", "jbd2_8k", | |
2004 | "jbd2_16k", "jbd2_32k", "jbd2_64k", "jbd2_128k" | |
2005 | }; | |
2006 | ||
2007 | ||
2008 | static void jbd2_journal_destroy_slabs(void) | |
2009 | { | |
2010 | int i; | |
2011 | ||
2012 | for (i = 0; i < JBD2_MAX_SLABS; i++) { | |
2013 | if (jbd2_slab[i]) | |
2014 | kmem_cache_destroy(jbd2_slab[i]); | |
2015 | jbd2_slab[i] = NULL; | |
2016 | } | |
2017 | } | |
2018 | ||
2019 | static int jbd2_journal_create_slab(size_t size) | |
2020 | { | |
51dfacde | 2021 | static DEFINE_MUTEX(jbd2_slab_create_mutex); |
d2eecb03 TT |
2022 | int i = order_base_2(size) - 10; |
2023 | size_t slab_size; | |
2024 | ||
2025 | if (size == PAGE_SIZE) | |
2026 | return 0; | |
2027 | ||
2028 | if (i >= JBD2_MAX_SLABS) | |
2029 | return -EINVAL; | |
2030 | ||
2031 | if (unlikely(i < 0)) | |
2032 | i = 0; | |
51dfacde | 2033 | mutex_lock(&jbd2_slab_create_mutex); |
d2eecb03 | 2034 | if (jbd2_slab[i]) { |
51dfacde | 2035 | mutex_unlock(&jbd2_slab_create_mutex); |
d2eecb03 TT |
2036 | return 0; /* Already created */ |
2037 | } | |
2038 | ||
2039 | slab_size = 1 << (i+10); | |
2040 | jbd2_slab[i] = kmem_cache_create(jbd2_slab_names[i], slab_size, | |
2041 | slab_size, 0, NULL); | |
51dfacde | 2042 | mutex_unlock(&jbd2_slab_create_mutex); |
d2eecb03 TT |
2043 | if (!jbd2_slab[i]) { |
2044 | printk(KERN_EMERG "JBD2: no memory for jbd2_slab cache\n"); | |
2045 | return -ENOMEM; | |
2046 | } | |
2047 | return 0; | |
2048 | } | |
2049 | ||
2050 | static struct kmem_cache *get_slab(size_t size) | |
2051 | { | |
2052 | int i = order_base_2(size) - 10; | |
2053 | ||
2054 | BUG_ON(i >= JBD2_MAX_SLABS); | |
2055 | if (unlikely(i < 0)) | |
2056 | i = 0; | |
8ac97b74 | 2057 | BUG_ON(jbd2_slab[i] == NULL); |
d2eecb03 TT |
2058 | return jbd2_slab[i]; |
2059 | } | |
2060 | ||
2061 | void *jbd2_alloc(size_t size, gfp_t flags) | |
2062 | { | |
2063 | void *ptr; | |
2064 | ||
2065 | BUG_ON(size & (size-1)); /* Must be a power of 2 */ | |
2066 | ||
2067 | flags |= __GFP_REPEAT; | |
2068 | if (size == PAGE_SIZE) | |
2069 | ptr = (void *)__get_free_pages(flags, 0); | |
2070 | else if (size > PAGE_SIZE) { | |
2071 | int order = get_order(size); | |
2072 | ||
2073 | if (order < 3) | |
2074 | ptr = (void *)__get_free_pages(flags, order); | |
2075 | else | |
2076 | ptr = vmalloc(size); | |
2077 | } else | |
2078 | ptr = kmem_cache_alloc(get_slab(size), flags); | |
2079 | ||
2080 | /* Check alignment; SLUB has gotten this wrong in the past, | |
2081 | * and this can lead to user data corruption! */ | |
2082 | BUG_ON(((unsigned long) ptr) & (size-1)); | |
2083 | ||
2084 | return ptr; | |
2085 | } | |
2086 | ||
2087 | void jbd2_free(void *ptr, size_t size) | |
2088 | { | |
2089 | if (size == PAGE_SIZE) { | |
2090 | free_pages((unsigned long)ptr, 0); | |
2091 | return; | |
2092 | } | |
2093 | if (size > PAGE_SIZE) { | |
2094 | int order = get_order(size); | |
2095 | ||
2096 | if (order < 3) | |
2097 | free_pages((unsigned long)ptr, order); | |
2098 | else | |
2099 | vfree(ptr); | |
2100 | return; | |
2101 | } | |
2102 | kmem_cache_free(get_slab(size), ptr); | |
2103 | }; | |
2104 | ||
470decc6 DK |
2105 | /* |
2106 | * Journal_head storage management | |
2107 | */ | |
e18b890b | 2108 | static struct kmem_cache *jbd2_journal_head_cache; |
e23291b9 | 2109 | #ifdef CONFIG_JBD2_DEBUG |
470decc6 DK |
2110 | static atomic_t nr_journal_heads = ATOMIC_INIT(0); |
2111 | #endif | |
2112 | ||
4185a2ac | 2113 | static int jbd2_journal_init_journal_head_cache(void) |
470decc6 DK |
2114 | { |
2115 | int retval; | |
2116 | ||
1076d17a | 2117 | J_ASSERT(jbd2_journal_head_cache == NULL); |
a920e941 | 2118 | jbd2_journal_head_cache = kmem_cache_create("jbd2_journal_head", |
470decc6 DK |
2119 | sizeof(struct journal_head), |
2120 | 0, /* offset */ | |
77160957 | 2121 | SLAB_TEMPORARY, /* flags */ |
20c2df83 | 2122 | NULL); /* ctor */ |
470decc6 | 2123 | retval = 0; |
1076d17a | 2124 | if (!jbd2_journal_head_cache) { |
470decc6 | 2125 | retval = -ENOMEM; |
f2a44523 | 2126 | printk(KERN_EMERG "JBD2: no memory for journal_head cache\n"); |
470decc6 DK |
2127 | } |
2128 | return retval; | |
2129 | } | |
2130 | ||
4185a2ac | 2131 | static void jbd2_journal_destroy_journal_head_cache(void) |
470decc6 | 2132 | { |
8a9362eb DG |
2133 | if (jbd2_journal_head_cache) { |
2134 | kmem_cache_destroy(jbd2_journal_head_cache); | |
2135 | jbd2_journal_head_cache = NULL; | |
2136 | } | |
470decc6 DK |
2137 | } |
2138 | ||
2139 | /* | |
2140 | * journal_head splicing and dicing | |
2141 | */ | |
2142 | static struct journal_head *journal_alloc_journal_head(void) | |
2143 | { | |
2144 | struct journal_head *ret; | |
470decc6 | 2145 | |
e23291b9 | 2146 | #ifdef CONFIG_JBD2_DEBUG |
470decc6 DK |
2147 | atomic_inc(&nr_journal_heads); |
2148 | #endif | |
f7f4bccb | 2149 | ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS); |
1076d17a | 2150 | if (!ret) { |
470decc6 | 2151 | jbd_debug(1, "out of memory for journal_head\n"); |
670be5a7 | 2152 | pr_notice_ratelimited("ENOMEM in %s, retrying.\n", __func__); |
1076d17a | 2153 | while (!ret) { |
470decc6 | 2154 | yield(); |
f7f4bccb | 2155 | ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS); |
470decc6 DK |
2156 | } |
2157 | } | |
2158 | return ret; | |
2159 | } | |
2160 | ||
2161 | static void journal_free_journal_head(struct journal_head *jh) | |
2162 | { | |
e23291b9 | 2163 | #ifdef CONFIG_JBD2_DEBUG |
470decc6 | 2164 | atomic_dec(&nr_journal_heads); |
cd02ff0b | 2165 | memset(jh, JBD2_POISON_FREE, sizeof(*jh)); |
470decc6 | 2166 | #endif |
f7f4bccb | 2167 | kmem_cache_free(jbd2_journal_head_cache, jh); |
470decc6 DK |
2168 | } |
2169 | ||
2170 | /* | |
2171 | * A journal_head is attached to a buffer_head whenever JBD has an | |
2172 | * interest in the buffer. | |
2173 | * | |
2174 | * Whenever a buffer has an attached journal_head, its ->b_state:BH_JBD bit | |
2175 | * is set. This bit is tested in core kernel code where we need to take | |
2176 | * JBD-specific actions. Testing the zeroness of ->b_private is not reliable | |
2177 | * there. | |
2178 | * | |
2179 | * When a buffer has its BH_JBD bit set, its ->b_count is elevated by one. | |
2180 | * | |
2181 | * When a buffer has its BH_JBD bit set it is immune from being released by | |
2182 | * core kernel code, mainly via ->b_count. | |
2183 | * | |
de1b7941 JK |
2184 | * A journal_head is detached from its buffer_head when the journal_head's |
2185 | * b_jcount reaches zero. Running transaction (b_transaction) and checkpoint | |
2186 | * transaction (b_cp_transaction) hold their references to b_jcount. | |
470decc6 DK |
2187 | * |
2188 | * Various places in the kernel want to attach a journal_head to a buffer_head | |
2189 | * _before_ attaching the journal_head to a transaction. To protect the | |
f7f4bccb | 2190 | * journal_head in this situation, jbd2_journal_add_journal_head elevates the |
470decc6 | 2191 | * journal_head's b_jcount refcount by one. The caller must call |
f7f4bccb | 2192 | * jbd2_journal_put_journal_head() to undo this. |
470decc6 DK |
2193 | * |
2194 | * So the typical usage would be: | |
2195 | * | |
2196 | * (Attach a journal_head if needed. Increments b_jcount) | |
f7f4bccb | 2197 | * struct journal_head *jh = jbd2_journal_add_journal_head(bh); |
470decc6 | 2198 | * ... |
de1b7941 JK |
2199 | * (Get another reference for transaction) |
2200 | * jbd2_journal_grab_journal_head(bh); | |
470decc6 | 2201 | * jh->b_transaction = xxx; |
de1b7941 | 2202 | * (Put original reference) |
f7f4bccb | 2203 | * jbd2_journal_put_journal_head(jh); |
470decc6 DK |
2204 | */ |
2205 | ||
2206 | /* | |
2207 | * Give a buffer_head a journal_head. | |
2208 | * | |
470decc6 DK |
2209 | * May sleep. |
2210 | */ | |
f7f4bccb | 2211 | struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh) |
470decc6 DK |
2212 | { |
2213 | struct journal_head *jh; | |
2214 | struct journal_head *new_jh = NULL; | |
2215 | ||
2216 | repeat: | |
2217 | if (!buffer_jbd(bh)) { | |
2218 | new_jh = journal_alloc_journal_head(); | |
2219 | memset(new_jh, 0, sizeof(*new_jh)); | |
2220 | } | |
2221 | ||
2222 | jbd_lock_bh_journal_head(bh); | |
2223 | if (buffer_jbd(bh)) { | |
2224 | jh = bh2jh(bh); | |
2225 | } else { | |
2226 | J_ASSERT_BH(bh, | |
2227 | (atomic_read(&bh->b_count) > 0) || | |
2228 | (bh->b_page && bh->b_page->mapping)); | |
2229 | ||
2230 | if (!new_jh) { | |
2231 | jbd_unlock_bh_journal_head(bh); | |
2232 | goto repeat; | |
2233 | } | |
2234 | ||
2235 | jh = new_jh; | |
2236 | new_jh = NULL; /* We consumed it */ | |
2237 | set_buffer_jbd(bh); | |
2238 | bh->b_private = jh; | |
2239 | jh->b_bh = bh; | |
2240 | get_bh(bh); | |
2241 | BUFFER_TRACE(bh, "added journal_head"); | |
2242 | } | |
2243 | jh->b_jcount++; | |
2244 | jbd_unlock_bh_journal_head(bh); | |
2245 | if (new_jh) | |
2246 | journal_free_journal_head(new_jh); | |
2247 | return bh->b_private; | |
2248 | } | |
2249 | ||
2250 | /* | |
2251 | * Grab a ref against this buffer_head's journal_head. If it ended up not | |
2252 | * having a journal_head, return NULL | |
2253 | */ | |
f7f4bccb | 2254 | struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh) |
470decc6 DK |
2255 | { |
2256 | struct journal_head *jh = NULL; | |
2257 | ||
2258 | jbd_lock_bh_journal_head(bh); | |
2259 | if (buffer_jbd(bh)) { | |
2260 | jh = bh2jh(bh); | |
2261 | jh->b_jcount++; | |
2262 | } | |
2263 | jbd_unlock_bh_journal_head(bh); | |
2264 | return jh; | |
2265 | } | |
2266 | ||
2267 | static void __journal_remove_journal_head(struct buffer_head *bh) | |
2268 | { | |
2269 | struct journal_head *jh = bh2jh(bh); | |
2270 | ||
2271 | J_ASSERT_JH(jh, jh->b_jcount >= 0); | |
de1b7941 JK |
2272 | J_ASSERT_JH(jh, jh->b_transaction == NULL); |
2273 | J_ASSERT_JH(jh, jh->b_next_transaction == NULL); | |
2274 | J_ASSERT_JH(jh, jh->b_cp_transaction == NULL); | |
2275 | J_ASSERT_JH(jh, jh->b_jlist == BJ_None); | |
2276 | J_ASSERT_BH(bh, buffer_jbd(bh)); | |
2277 | J_ASSERT_BH(bh, jh2bh(jh) == bh); | |
2278 | BUFFER_TRACE(bh, "remove journal_head"); | |
2279 | if (jh->b_frozen_data) { | |
2280 | printk(KERN_WARNING "%s: freeing b_frozen_data\n", __func__); | |
2281 | jbd2_free(jh->b_frozen_data, bh->b_size); | |
470decc6 | 2282 | } |
de1b7941 JK |
2283 | if (jh->b_committed_data) { |
2284 | printk(KERN_WARNING "%s: freeing b_committed_data\n", __func__); | |
2285 | jbd2_free(jh->b_committed_data, bh->b_size); | |
2286 | } | |
2287 | bh->b_private = NULL; | |
2288 | jh->b_bh = NULL; /* debug, really */ | |
2289 | clear_buffer_jbd(bh); | |
2290 | journal_free_journal_head(jh); | |
470decc6 DK |
2291 | } |
2292 | ||
2293 | /* | |
de1b7941 | 2294 | * Drop a reference on the passed journal_head. If it fell to zero then |
470decc6 DK |
2295 | * release the journal_head from the buffer_head. |
2296 | */ | |
f7f4bccb | 2297 | void jbd2_journal_put_journal_head(struct journal_head *jh) |
470decc6 DK |
2298 | { |
2299 | struct buffer_head *bh = jh2bh(jh); | |
2300 | ||
2301 | jbd_lock_bh_journal_head(bh); | |
2302 | J_ASSERT_JH(jh, jh->b_jcount > 0); | |
2303 | --jh->b_jcount; | |
de1b7941 | 2304 | if (!jh->b_jcount) { |
470decc6 | 2305 | __journal_remove_journal_head(bh); |
de1b7941 | 2306 | jbd_unlock_bh_journal_head(bh); |
470decc6 | 2307 | __brelse(bh); |
de1b7941 JK |
2308 | } else |
2309 | jbd_unlock_bh_journal_head(bh); | |
470decc6 DK |
2310 | } |
2311 | ||
c851ed54 JK |
2312 | /* |
2313 | * Initialize jbd inode head | |
2314 | */ | |
2315 | void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode) | |
2316 | { | |
2317 | jinode->i_transaction = NULL; | |
2318 | jinode->i_next_transaction = NULL; | |
2319 | jinode->i_vfs_inode = inode; | |
2320 | jinode->i_flags = 0; | |
2321 | INIT_LIST_HEAD(&jinode->i_list); | |
2322 | } | |
2323 | ||
2324 | /* | |
2325 | * Function to be called before we start removing inode from memory (i.e., | |
2326 | * clear_inode() is a fine place to be called from). It removes inode from | |
2327 | * transaction's lists. | |
2328 | */ | |
2329 | void jbd2_journal_release_jbd_inode(journal_t *journal, | |
2330 | struct jbd2_inode *jinode) | |
2331 | { | |
c851ed54 JK |
2332 | if (!journal) |
2333 | return; | |
2334 | restart: | |
2335 | spin_lock(&journal->j_list_lock); | |
2336 | /* Is commit writing out inode - we have to wait */ | |
39e3ac25 | 2337 | if (test_bit(__JI_COMMIT_RUNNING, &jinode->i_flags)) { |
c851ed54 JK |
2338 | wait_queue_head_t *wq; |
2339 | DEFINE_WAIT_BIT(wait, &jinode->i_flags, __JI_COMMIT_RUNNING); | |
2340 | wq = bit_waitqueue(&jinode->i_flags, __JI_COMMIT_RUNNING); | |
2341 | prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); | |
2342 | spin_unlock(&journal->j_list_lock); | |
2343 | schedule(); | |
2344 | finish_wait(wq, &wait.wait); | |
2345 | goto restart; | |
2346 | } | |
2347 | ||
c851ed54 JK |
2348 | if (jinode->i_transaction) { |
2349 | list_del(&jinode->i_list); | |
2350 | jinode->i_transaction = NULL; | |
2351 | } | |
2352 | spin_unlock(&journal->j_list_lock); | |
2353 | } | |
2354 | ||
470decc6 | 2355 | /* |
0f49d5d0 | 2356 | * debugfs tunables |
470decc6 | 2357 | */ |
6f38c74f JS |
2358 | #ifdef CONFIG_JBD2_DEBUG |
2359 | u8 jbd2_journal_enable_debug __read_mostly; | |
f7f4bccb | 2360 | EXPORT_SYMBOL(jbd2_journal_enable_debug); |
470decc6 | 2361 | |
0f49d5d0 | 2362 | #define JBD2_DEBUG_NAME "jbd2-debug" |
470decc6 | 2363 | |
6f38c74f JS |
2364 | static struct dentry *jbd2_debugfs_dir; |
2365 | static struct dentry *jbd2_debug; | |
470decc6 | 2366 | |
0f49d5d0 JS |
2367 | static void __init jbd2_create_debugfs_entry(void) |
2368 | { | |
2369 | jbd2_debugfs_dir = debugfs_create_dir("jbd2", NULL); | |
2370 | if (jbd2_debugfs_dir) | |
765f8361 YK |
2371 | jbd2_debug = debugfs_create_u8(JBD2_DEBUG_NAME, |
2372 | S_IRUGO | S_IWUSR, | |
0f49d5d0 JS |
2373 | jbd2_debugfs_dir, |
2374 | &jbd2_journal_enable_debug); | |
470decc6 DK |
2375 | } |
2376 | ||
0f49d5d0 | 2377 | static void __exit jbd2_remove_debugfs_entry(void) |
470decc6 | 2378 | { |
6f38c74f JS |
2379 | debugfs_remove(jbd2_debug); |
2380 | debugfs_remove(jbd2_debugfs_dir); | |
470decc6 DK |
2381 | } |
2382 | ||
0f49d5d0 | 2383 | #else |
470decc6 | 2384 | |
0f49d5d0 | 2385 | static void __init jbd2_create_debugfs_entry(void) |
470decc6 | 2386 | { |
470decc6 DK |
2387 | } |
2388 | ||
0f49d5d0 | 2389 | static void __exit jbd2_remove_debugfs_entry(void) |
470decc6 | 2390 | { |
470decc6 DK |
2391 | } |
2392 | ||
470decc6 DK |
2393 | #endif |
2394 | ||
8e85fb3f JL |
2395 | #ifdef CONFIG_PROC_FS |
2396 | ||
2397 | #define JBD2_STATS_PROC_NAME "fs/jbd2" | |
2398 | ||
2399 | static void __init jbd2_create_jbd_stats_proc_entry(void) | |
2400 | { | |
2401 | proc_jbd2_stats = proc_mkdir(JBD2_STATS_PROC_NAME, NULL); | |
2402 | } | |
2403 | ||
2404 | static void __exit jbd2_remove_jbd_stats_proc_entry(void) | |
2405 | { | |
2406 | if (proc_jbd2_stats) | |
2407 | remove_proc_entry(JBD2_STATS_PROC_NAME, NULL); | |
2408 | } | |
2409 | ||
2410 | #else | |
2411 | ||
2412 | #define jbd2_create_jbd_stats_proc_entry() do {} while (0) | |
2413 | #define jbd2_remove_jbd_stats_proc_entry() do {} while (0) | |
2414 | ||
2415 | #endif | |
2416 | ||
8aefcd55 | 2417 | struct kmem_cache *jbd2_handle_cache, *jbd2_inode_cache; |
470decc6 | 2418 | |
4185a2ac | 2419 | static int __init jbd2_journal_init_handle_cache(void) |
470decc6 | 2420 | { |
8aefcd55 | 2421 | jbd2_handle_cache = KMEM_CACHE(jbd2_journal_handle, SLAB_TEMPORARY); |
f7f4bccb | 2422 | if (jbd2_handle_cache == NULL) { |
8aefcd55 TT |
2423 | printk(KERN_EMERG "JBD2: failed to create handle cache\n"); |
2424 | return -ENOMEM; | |
2425 | } | |
2426 | jbd2_inode_cache = KMEM_CACHE(jbd2_inode, 0); | |
2427 | if (jbd2_inode_cache == NULL) { | |
2428 | printk(KERN_EMERG "JBD2: failed to create inode cache\n"); | |
2429 | kmem_cache_destroy(jbd2_handle_cache); | |
470decc6 DK |
2430 | return -ENOMEM; |
2431 | } | |
2432 | return 0; | |
2433 | } | |
2434 | ||
f7f4bccb | 2435 | static void jbd2_journal_destroy_handle_cache(void) |
470decc6 | 2436 | { |
f7f4bccb MC |
2437 | if (jbd2_handle_cache) |
2438 | kmem_cache_destroy(jbd2_handle_cache); | |
8aefcd55 TT |
2439 | if (jbd2_inode_cache) |
2440 | kmem_cache_destroy(jbd2_inode_cache); | |
2441 | ||
470decc6 DK |
2442 | } |
2443 | ||
2444 | /* | |
2445 | * Module startup and shutdown | |
2446 | */ | |
2447 | ||
2448 | static int __init journal_init_caches(void) | |
2449 | { | |
2450 | int ret; | |
2451 | ||
f7f4bccb | 2452 | ret = jbd2_journal_init_revoke_caches(); |
470decc6 | 2453 | if (ret == 0) |
4185a2ac | 2454 | ret = jbd2_journal_init_journal_head_cache(); |
470decc6 | 2455 | if (ret == 0) |
4185a2ac | 2456 | ret = jbd2_journal_init_handle_cache(); |
470decc6 | 2457 | if (ret == 0) |
0c2022ec | 2458 | ret = jbd2_journal_init_transaction_cache(); |
470decc6 DK |
2459 | return ret; |
2460 | } | |
2461 | ||
f7f4bccb | 2462 | static void jbd2_journal_destroy_caches(void) |
470decc6 | 2463 | { |
f7f4bccb | 2464 | jbd2_journal_destroy_revoke_caches(); |
4185a2ac | 2465 | jbd2_journal_destroy_journal_head_cache(); |
f7f4bccb | 2466 | jbd2_journal_destroy_handle_cache(); |
0c2022ec | 2467 | jbd2_journal_destroy_transaction_cache(); |
d2eecb03 | 2468 | jbd2_journal_destroy_slabs(); |
470decc6 DK |
2469 | } |
2470 | ||
2471 | static int __init journal_init(void) | |
2472 | { | |
2473 | int ret; | |
2474 | ||
2475 | BUILD_BUG_ON(sizeof(struct journal_superblock_s) != 1024); | |
2476 | ||
2477 | ret = journal_init_caches(); | |
620de4e1 DG |
2478 | if (ret == 0) { |
2479 | jbd2_create_debugfs_entry(); | |
2480 | jbd2_create_jbd_stats_proc_entry(); | |
2481 | } else { | |
f7f4bccb | 2482 | jbd2_journal_destroy_caches(); |
620de4e1 | 2483 | } |
470decc6 DK |
2484 | return ret; |
2485 | } | |
2486 | ||
2487 | static void __exit journal_exit(void) | |
2488 | { | |
e23291b9 | 2489 | #ifdef CONFIG_JBD2_DEBUG |
470decc6 DK |
2490 | int n = atomic_read(&nr_journal_heads); |
2491 | if (n) | |
f2a44523 | 2492 | printk(KERN_EMERG "JBD2: leaked %d journal_heads!\n", n); |
470decc6 | 2493 | #endif |
0f49d5d0 | 2494 | jbd2_remove_debugfs_entry(); |
8e85fb3f | 2495 | jbd2_remove_jbd_stats_proc_entry(); |
f7f4bccb | 2496 | jbd2_journal_destroy_caches(); |
470decc6 DK |
2497 | } |
2498 | ||
2499 | MODULE_LICENSE("GPL"); | |
2500 | module_init(journal_init); | |
2501 | module_exit(journal_exit); | |
2502 |