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1da177e4 LT |
1 | /* |
2 | ** Write ahead logging implementation copyright Chris Mason 2000 | |
3 | ** | |
4 | ** The background commits make this code very interelated, and | |
5 | ** overly complex. I need to rethink things a bit....The major players: | |
6 | ** | |
7 | ** journal_begin -- call with the number of blocks you expect to log. | |
8 | ** If the current transaction is too | |
9 | ** old, it will block until the current transaction is | |
10 | ** finished, and then start a new one. | |
11 | ** Usually, your transaction will get joined in with | |
12 | ** previous ones for speed. | |
13 | ** | |
14 | ** journal_join -- same as journal_begin, but won't block on the current | |
15 | ** transaction regardless of age. Don't ever call | |
16 | ** this. Ever. There are only two places it should be | |
17 | ** called from, and they are both inside this file. | |
18 | ** | |
19 | ** journal_mark_dirty -- adds blocks into this transaction. clears any flags | |
20 | ** that might make them get sent to disk | |
21 | ** and then marks them BH_JDirty. Puts the buffer head | |
22 | ** into the current transaction hash. | |
23 | ** | |
24 | ** journal_end -- if the current transaction is batchable, it does nothing | |
25 | ** otherwise, it could do an async/synchronous commit, or | |
26 | ** a full flush of all log and real blocks in the | |
27 | ** transaction. | |
28 | ** | |
29 | ** flush_old_commits -- if the current transaction is too old, it is ended and | |
30 | ** commit blocks are sent to disk. Forces commit blocks | |
31 | ** to disk for all backgrounded commits that have been | |
32 | ** around too long. | |
33 | ** -- Note, if you call this as an immediate flush from | |
34 | ** from within kupdate, it will ignore the immediate flag | |
35 | */ | |
36 | ||
37 | #include <linux/config.h> | |
38 | #include <asm/uaccess.h> | |
39 | #include <asm/system.h> | |
40 | ||
41 | #include <linux/time.h> | |
42 | #include <asm/semaphore.h> | |
43 | ||
44 | #include <linux/vmalloc.h> | |
45 | #include <linux/reiserfs_fs.h> | |
46 | ||
47 | #include <linux/kernel.h> | |
48 | #include <linux/errno.h> | |
49 | #include <linux/fcntl.h> | |
50 | #include <linux/stat.h> | |
51 | #include <linux/string.h> | |
52 | #include <linux/smp_lock.h> | |
53 | #include <linux/buffer_head.h> | |
54 | #include <linux/workqueue.h> | |
55 | #include <linux/writeback.h> | |
56 | #include <linux/blkdev.h> | |
57 | ||
1da177e4 LT |
58 | /* gets a struct reiserfs_journal_list * from a list head */ |
59 | #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \ | |
60 | j_list)) | |
61 | #define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \ | |
62 | j_working_list)) | |
63 | ||
64 | /* the number of mounted filesystems. This is used to decide when to | |
65 | ** start and kill the commit workqueue | |
66 | */ | |
67 | static int reiserfs_mounted_fs_count; | |
68 | ||
69 | static struct workqueue_struct *commit_wq; | |
70 | ||
bd4c625c LT |
71 | #define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit |
72 | structs at 4k */ | |
73 | #define BUFNR 64 /*read ahead */ | |
1da177e4 LT |
74 | |
75 | /* cnode stat bits. Move these into reiserfs_fs.h */ | |
76 | ||
77 | #define BLOCK_FREED 2 /* this block was freed, and can't be written. */ | |
bd4c625c | 78 | #define BLOCK_FREED_HOLDER 3 /* this block was freed during this transaction, and can't be written */ |
1da177e4 LT |
79 | |
80 | #define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */ | |
81 | #define BLOCK_DIRTIED 5 | |
82 | ||
1da177e4 LT |
83 | /* journal list state bits */ |
84 | #define LIST_TOUCHED 1 | |
85 | #define LIST_DIRTY 2 | |
bd4c625c | 86 | #define LIST_COMMIT_PENDING 4 /* someone will commit this list */ |
1da177e4 LT |
87 | |
88 | /* flags for do_journal_end */ | |
89 | #define FLUSH_ALL 1 /* flush commit and real blocks */ | |
90 | #define COMMIT_NOW 2 /* end and commit this transaction */ | |
bd4c625c LT |
91 | #define WAIT 4 /* wait for the log blocks to hit the disk */ |
92 | ||
93 | static int do_journal_end(struct reiserfs_transaction_handle *, | |
94 | struct super_block *, unsigned long nblocks, | |
95 | int flags); | |
96 | static int flush_journal_list(struct super_block *s, | |
97 | struct reiserfs_journal_list *jl, int flushall); | |
98 | static int flush_commit_list(struct super_block *s, | |
99 | struct reiserfs_journal_list *jl, int flushall); | |
100 | static int can_dirty(struct reiserfs_journal_cnode *cn); | |
101 | static int journal_join(struct reiserfs_transaction_handle *th, | |
102 | struct super_block *p_s_sb, unsigned long nblocks); | |
103 | static int release_journal_dev(struct super_block *super, | |
104 | struct reiserfs_journal *journal); | |
1da177e4 | 105 | static int dirty_one_transaction(struct super_block *s, |
bd4c625c | 106 | struct reiserfs_journal_list *jl); |
1da177e4 LT |
107 | static void flush_async_commits(void *p); |
108 | static void queue_log_writer(struct super_block *s); | |
109 | ||
110 | /* values for join in do_journal_begin_r */ | |
111 | enum { | |
bd4c625c LT |
112 | JBEGIN_REG = 0, /* regular journal begin */ |
113 | JBEGIN_JOIN = 1, /* join the running transaction if at all possible */ | |
114 | JBEGIN_ABORT = 2, /* called from cleanup code, ignores aborted flag */ | |
1da177e4 LT |
115 | }; |
116 | ||
117 | static int do_journal_begin_r(struct reiserfs_transaction_handle *th, | |
bd4c625c LT |
118 | struct super_block *p_s_sb, |
119 | unsigned long nblocks, int join); | |
1da177e4 | 120 | |
bd4c625c LT |
121 | static void init_journal_hash(struct super_block *p_s_sb) |
122 | { | |
123 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
124 | memset(journal->j_hash_table, 0, | |
125 | JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)); | |
1da177e4 LT |
126 | } |
127 | ||
128 | /* | |
129 | ** clears BH_Dirty and sticks the buffer on the clean list. Called because I can't allow refile_buffer to | |
130 | ** make schedule happen after I've freed a block. Look at remove_from_transaction and journal_mark_freed for | |
131 | ** more details. | |
132 | */ | |
bd4c625c LT |
133 | static int reiserfs_clean_and_file_buffer(struct buffer_head *bh) |
134 | { | |
135 | if (bh) { | |
136 | clear_buffer_dirty(bh); | |
137 | clear_buffer_journal_test(bh); | |
138 | } | |
139 | return 0; | |
1da177e4 LT |
140 | } |
141 | ||
142 | static void disable_barrier(struct super_block *s) | |
143 | { | |
bd4c625c LT |
144 | REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_BARRIER_FLUSH); |
145 | printk("reiserfs: disabling flush barriers on %s\n", | |
146 | reiserfs_bdevname(s)); | |
147 | } | |
148 | ||
149 | static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block | |
150 | *p_s_sb) | |
151 | { | |
152 | struct reiserfs_bitmap_node *bn; | |
153 | static int id; | |
154 | ||
d739b42b | 155 | bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS); |
bd4c625c LT |
156 | if (!bn) { |
157 | return NULL; | |
158 | } | |
d739b42b | 159 | bn->data = kzalloc(p_s_sb->s_blocksize, GFP_NOFS); |
bd4c625c | 160 | if (!bn->data) { |
d739b42b | 161 | kfree(bn); |
bd4c625c LT |
162 | return NULL; |
163 | } | |
164 | bn->id = id++; | |
bd4c625c LT |
165 | INIT_LIST_HEAD(&bn->list); |
166 | return bn; | |
167 | } | |
168 | ||
169 | static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *p_s_sb) | |
170 | { | |
171 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
172 | struct reiserfs_bitmap_node *bn = NULL; | |
173 | struct list_head *entry = journal->j_bitmap_nodes.next; | |
174 | ||
175 | journal->j_used_bitmap_nodes++; | |
176 | repeat: | |
177 | ||
178 | if (entry != &journal->j_bitmap_nodes) { | |
179 | bn = list_entry(entry, struct reiserfs_bitmap_node, list); | |
180 | list_del(entry); | |
181 | memset(bn->data, 0, p_s_sb->s_blocksize); | |
182 | journal->j_free_bitmap_nodes--; | |
183 | return bn; | |
184 | } | |
185 | bn = allocate_bitmap_node(p_s_sb); | |
186 | if (!bn) { | |
187 | yield(); | |
188 | goto repeat; | |
189 | } | |
190 | return bn; | |
1da177e4 LT |
191 | } |
192 | static inline void free_bitmap_node(struct super_block *p_s_sb, | |
bd4c625c LT |
193 | struct reiserfs_bitmap_node *bn) |
194 | { | |
195 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
196 | journal->j_used_bitmap_nodes--; | |
197 | if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) { | |
d739b42b PE |
198 | kfree(bn->data); |
199 | kfree(bn); | |
bd4c625c LT |
200 | } else { |
201 | list_add(&bn->list, &journal->j_bitmap_nodes); | |
202 | journal->j_free_bitmap_nodes++; | |
203 | } | |
204 | } | |
205 | ||
206 | static void allocate_bitmap_nodes(struct super_block *p_s_sb) | |
207 | { | |
208 | int i; | |
209 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
210 | struct reiserfs_bitmap_node *bn = NULL; | |
211 | for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) { | |
212 | bn = allocate_bitmap_node(p_s_sb); | |
213 | if (bn) { | |
214 | list_add(&bn->list, &journal->j_bitmap_nodes); | |
215 | journal->j_free_bitmap_nodes++; | |
216 | } else { | |
217 | break; // this is ok, we'll try again when more are needed | |
218 | } | |
219 | } | |
1da177e4 LT |
220 | } |
221 | ||
222 | static int set_bit_in_list_bitmap(struct super_block *p_s_sb, int block, | |
bd4c625c LT |
223 | struct reiserfs_list_bitmap *jb) |
224 | { | |
225 | int bmap_nr = block / (p_s_sb->s_blocksize << 3); | |
226 | int bit_nr = block % (p_s_sb->s_blocksize << 3); | |
1da177e4 | 227 | |
bd4c625c LT |
228 | if (!jb->bitmaps[bmap_nr]) { |
229 | jb->bitmaps[bmap_nr] = get_bitmap_node(p_s_sb); | |
230 | } | |
231 | set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data); | |
232 | return 0; | |
1da177e4 LT |
233 | } |
234 | ||
235 | static void cleanup_bitmap_list(struct super_block *p_s_sb, | |
bd4c625c LT |
236 | struct reiserfs_list_bitmap *jb) |
237 | { | |
238 | int i; | |
239 | if (jb->bitmaps == NULL) | |
240 | return; | |
241 | ||
242 | for (i = 0; i < SB_BMAP_NR(p_s_sb); i++) { | |
243 | if (jb->bitmaps[i]) { | |
244 | free_bitmap_node(p_s_sb, jb->bitmaps[i]); | |
245 | jb->bitmaps[i] = NULL; | |
246 | } | |
247 | } | |
1da177e4 LT |
248 | } |
249 | ||
250 | /* | |
251 | ** only call this on FS unmount. | |
252 | */ | |
253 | static int free_list_bitmaps(struct super_block *p_s_sb, | |
bd4c625c LT |
254 | struct reiserfs_list_bitmap *jb_array) |
255 | { | |
256 | int i; | |
257 | struct reiserfs_list_bitmap *jb; | |
258 | for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { | |
259 | jb = jb_array + i; | |
260 | jb->journal_list = NULL; | |
261 | cleanup_bitmap_list(p_s_sb, jb); | |
262 | vfree(jb->bitmaps); | |
263 | jb->bitmaps = NULL; | |
264 | } | |
265 | return 0; | |
266 | } | |
267 | ||
268 | static int free_bitmap_nodes(struct super_block *p_s_sb) | |
269 | { | |
270 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
271 | struct list_head *next = journal->j_bitmap_nodes.next; | |
272 | struct reiserfs_bitmap_node *bn; | |
273 | ||
274 | while (next != &journal->j_bitmap_nodes) { | |
275 | bn = list_entry(next, struct reiserfs_bitmap_node, list); | |
276 | list_del(next); | |
d739b42b PE |
277 | kfree(bn->data); |
278 | kfree(bn); | |
bd4c625c LT |
279 | next = journal->j_bitmap_nodes.next; |
280 | journal->j_free_bitmap_nodes--; | |
281 | } | |
282 | ||
283 | return 0; | |
1da177e4 LT |
284 | } |
285 | ||
286 | /* | |
287 | ** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps. | |
288 | ** jb_array is the array to be filled in. | |
289 | */ | |
290 | int reiserfs_allocate_list_bitmaps(struct super_block *p_s_sb, | |
bd4c625c LT |
291 | struct reiserfs_list_bitmap *jb_array, |
292 | int bmap_nr) | |
293 | { | |
294 | int i; | |
295 | int failed = 0; | |
296 | struct reiserfs_list_bitmap *jb; | |
297 | int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *); | |
298 | ||
299 | for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { | |
300 | jb = jb_array + i; | |
301 | jb->journal_list = NULL; | |
302 | jb->bitmaps = vmalloc(mem); | |
303 | if (!jb->bitmaps) { | |
304 | reiserfs_warning(p_s_sb, | |
305 | "clm-2000, unable to allocate bitmaps for journal lists"); | |
306 | failed = 1; | |
307 | break; | |
308 | } | |
309 | memset(jb->bitmaps, 0, mem); | |
310 | } | |
311 | if (failed) { | |
312 | free_list_bitmaps(p_s_sb, jb_array); | |
313 | return -1; | |
314 | } | |
315 | return 0; | |
1da177e4 LT |
316 | } |
317 | ||
318 | /* | |
319 | ** find an available list bitmap. If you can't find one, flush a commit list | |
320 | ** and try again | |
321 | */ | |
bd4c625c LT |
322 | static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *p_s_sb, |
323 | struct reiserfs_journal_list | |
324 | *jl) | |
325 | { | |
326 | int i, j; | |
327 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
328 | struct reiserfs_list_bitmap *jb = NULL; | |
329 | ||
330 | for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) { | |
331 | i = journal->j_list_bitmap_index; | |
332 | journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS; | |
333 | jb = journal->j_list_bitmap + i; | |
334 | if (journal->j_list_bitmap[i].journal_list) { | |
335 | flush_commit_list(p_s_sb, | |
336 | journal->j_list_bitmap[i]. | |
337 | journal_list, 1); | |
338 | if (!journal->j_list_bitmap[i].journal_list) { | |
339 | break; | |
340 | } | |
341 | } else { | |
342 | break; | |
343 | } | |
344 | } | |
345 | if (jb->journal_list) { /* double check to make sure if flushed correctly */ | |
346 | return NULL; | |
347 | } | |
348 | jb->journal_list = jl; | |
349 | return jb; | |
1da177e4 LT |
350 | } |
351 | ||
352 | /* | |
353 | ** allocates a new chunk of X nodes, and links them all together as a list. | |
354 | ** Uses the cnode->next and cnode->prev pointers | |
355 | ** returns NULL on failure | |
356 | */ | |
bd4c625c LT |
357 | static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes) |
358 | { | |
359 | struct reiserfs_journal_cnode *head; | |
360 | int i; | |
361 | if (num_cnodes <= 0) { | |
362 | return NULL; | |
363 | } | |
364 | head = vmalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode)); | |
365 | if (!head) { | |
366 | return NULL; | |
367 | } | |
368 | memset(head, 0, num_cnodes * sizeof(struct reiserfs_journal_cnode)); | |
369 | head[0].prev = NULL; | |
370 | head[0].next = head + 1; | |
371 | for (i = 1; i < num_cnodes; i++) { | |
372 | head[i].prev = head + (i - 1); | |
373 | head[i].next = head + (i + 1); /* if last one, overwrite it after the if */ | |
374 | } | |
375 | head[num_cnodes - 1].next = NULL; | |
376 | return head; | |
1da177e4 LT |
377 | } |
378 | ||
379 | /* | |
380 | ** pulls a cnode off the free list, or returns NULL on failure | |
381 | */ | |
bd4c625c LT |
382 | static struct reiserfs_journal_cnode *get_cnode(struct super_block *p_s_sb) |
383 | { | |
384 | struct reiserfs_journal_cnode *cn; | |
385 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
386 | ||
387 | reiserfs_check_lock_depth(p_s_sb, "get_cnode"); | |
388 | ||
389 | if (journal->j_cnode_free <= 0) { | |
390 | return NULL; | |
391 | } | |
392 | journal->j_cnode_used++; | |
393 | journal->j_cnode_free--; | |
394 | cn = journal->j_cnode_free_list; | |
395 | if (!cn) { | |
396 | return cn; | |
397 | } | |
398 | if (cn->next) { | |
399 | cn->next->prev = NULL; | |
400 | } | |
401 | journal->j_cnode_free_list = cn->next; | |
402 | memset(cn, 0, sizeof(struct reiserfs_journal_cnode)); | |
403 | return cn; | |
1da177e4 LT |
404 | } |
405 | ||
406 | /* | |
407 | ** returns a cnode to the free list | |
408 | */ | |
bd4c625c LT |
409 | static void free_cnode(struct super_block *p_s_sb, |
410 | struct reiserfs_journal_cnode *cn) | |
411 | { | |
412 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
1da177e4 | 413 | |
bd4c625c | 414 | reiserfs_check_lock_depth(p_s_sb, "free_cnode"); |
1da177e4 | 415 | |
bd4c625c LT |
416 | journal->j_cnode_used--; |
417 | journal->j_cnode_free++; | |
418 | /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */ | |
419 | cn->next = journal->j_cnode_free_list; | |
420 | if (journal->j_cnode_free_list) { | |
421 | journal->j_cnode_free_list->prev = cn; | |
422 | } | |
423 | cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */ | |
424 | journal->j_cnode_free_list = cn; | |
1da177e4 LT |
425 | } |
426 | ||
bd4c625c LT |
427 | static void clear_prepared_bits(struct buffer_head *bh) |
428 | { | |
429 | clear_buffer_journal_prepared(bh); | |
430 | clear_buffer_journal_restore_dirty(bh); | |
1da177e4 LT |
431 | } |
432 | ||
433 | /* utility function to force a BUG if it is called without the big | |
434 | ** kernel lock held. caller is the string printed just before calling BUG() | |
435 | */ | |
bd4c625c LT |
436 | void reiserfs_check_lock_depth(struct super_block *sb, char *caller) |
437 | { | |
1da177e4 | 438 | #ifdef CONFIG_SMP |
bd4c625c LT |
439 | if (current->lock_depth < 0) { |
440 | reiserfs_panic(sb, "%s called without kernel lock held", | |
441 | caller); | |
442 | } | |
1da177e4 | 443 | #else |
bd4c625c | 444 | ; |
1da177e4 LT |
445 | #endif |
446 | } | |
447 | ||
448 | /* return a cnode with same dev, block number and size in table, or null if not found */ | |
bd4c625c LT |
449 | static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct |
450 | super_block | |
451 | *sb, | |
452 | struct | |
453 | reiserfs_journal_cnode | |
454 | **table, | |
455 | long bl) | |
1da177e4 | 456 | { |
bd4c625c LT |
457 | struct reiserfs_journal_cnode *cn; |
458 | cn = journal_hash(table, sb, bl); | |
459 | while (cn) { | |
460 | if (cn->blocknr == bl && cn->sb == sb) | |
461 | return cn; | |
462 | cn = cn->hnext; | |
463 | } | |
464 | return (struct reiserfs_journal_cnode *)0; | |
1da177e4 LT |
465 | } |
466 | ||
467 | /* | |
468 | ** this actually means 'can this block be reallocated yet?'. If you set search_all, a block can only be allocated | |
469 | ** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever | |
470 | ** being overwritten by a replay after crashing. | |
471 | ** | |
472 | ** If you don't set search_all, a block can only be allocated if it is not in the current transaction. Since deleting | |
473 | ** a block removes it from the current transaction, this case should never happen. If you don't set search_all, make | |
474 | ** sure you never write the block without logging it. | |
475 | ** | |
476 | ** next_zero_bit is a suggestion about the next block to try for find_forward. | |
477 | ** when bl is rejected because it is set in a journal list bitmap, we search | |
478 | ** for the next zero bit in the bitmap that rejected bl. Then, we return that | |
479 | ** through next_zero_bit for find_forward to try. | |
480 | ** | |
481 | ** Just because we return something in next_zero_bit does not mean we won't | |
482 | ** reject it on the next call to reiserfs_in_journal | |
483 | ** | |
484 | */ | |
485 | int reiserfs_in_journal(struct super_block *p_s_sb, | |
bd4c625c LT |
486 | int bmap_nr, int bit_nr, int search_all, |
487 | b_blocknr_t * next_zero_bit) | |
488 | { | |
489 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
490 | struct reiserfs_journal_cnode *cn; | |
491 | struct reiserfs_list_bitmap *jb; | |
492 | int i; | |
493 | unsigned long bl; | |
494 | ||
495 | *next_zero_bit = 0; /* always start this at zero. */ | |
496 | ||
497 | PROC_INFO_INC(p_s_sb, journal.in_journal); | |
498 | /* If we aren't doing a search_all, this is a metablock, and it will be logged before use. | |
499 | ** if we crash before the transaction that freed it commits, this transaction won't | |
500 | ** have committed either, and the block will never be written | |
501 | */ | |
502 | if (search_all) { | |
503 | for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { | |
504 | PROC_INFO_INC(p_s_sb, journal.in_journal_bitmap); | |
505 | jb = journal->j_list_bitmap + i; | |
506 | if (jb->journal_list && jb->bitmaps[bmap_nr] && | |
507 | test_bit(bit_nr, | |
508 | (unsigned long *)jb->bitmaps[bmap_nr]-> | |
509 | data)) { | |
510 | *next_zero_bit = | |
511 | find_next_zero_bit((unsigned long *) | |
512 | (jb->bitmaps[bmap_nr]-> | |
513 | data), | |
514 | p_s_sb->s_blocksize << 3, | |
515 | bit_nr + 1); | |
516 | return 1; | |
517 | } | |
518 | } | |
519 | } | |
520 | ||
521 | bl = bmap_nr * (p_s_sb->s_blocksize << 3) + bit_nr; | |
522 | /* is it in any old transactions? */ | |
523 | if (search_all | |
524 | && (cn = | |
525 | get_journal_hash_dev(p_s_sb, journal->j_list_hash_table, bl))) { | |
526 | return 1; | |
527 | } | |
528 | ||
529 | /* is it in the current transaction. This should never happen */ | |
530 | if ((cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, bl))) { | |
531 | BUG(); | |
532 | return 1; | |
533 | } | |
534 | ||
535 | PROC_INFO_INC(p_s_sb, journal.in_journal_reusable); | |
536 | /* safe for reuse */ | |
537 | return 0; | |
1da177e4 LT |
538 | } |
539 | ||
540 | /* insert cn into table | |
541 | */ | |
bd4c625c LT |
542 | static inline void insert_journal_hash(struct reiserfs_journal_cnode **table, |
543 | struct reiserfs_journal_cnode *cn) | |
544 | { | |
545 | struct reiserfs_journal_cnode *cn_orig; | |
1da177e4 | 546 | |
bd4c625c LT |
547 | cn_orig = journal_hash(table, cn->sb, cn->blocknr); |
548 | cn->hnext = cn_orig; | |
549 | cn->hprev = NULL; | |
550 | if (cn_orig) { | |
551 | cn_orig->hprev = cn; | |
552 | } | |
553 | journal_hash(table, cn->sb, cn->blocknr) = cn; | |
1da177e4 LT |
554 | } |
555 | ||
556 | /* lock the current transaction */ | |
77933d72 | 557 | static inline void lock_journal(struct super_block *p_s_sb) |
bd4c625c LT |
558 | { |
559 | PROC_INFO_INC(p_s_sb, journal.lock_journal); | |
560 | down(&SB_JOURNAL(p_s_sb)->j_lock); | |
1da177e4 LT |
561 | } |
562 | ||
563 | /* unlock the current transaction */ | |
77933d72 | 564 | static inline void unlock_journal(struct super_block *p_s_sb) |
bd4c625c LT |
565 | { |
566 | up(&SB_JOURNAL(p_s_sb)->j_lock); | |
1da177e4 LT |
567 | } |
568 | ||
569 | static inline void get_journal_list(struct reiserfs_journal_list *jl) | |
570 | { | |
bd4c625c | 571 | jl->j_refcount++; |
1da177e4 LT |
572 | } |
573 | ||
574 | static inline void put_journal_list(struct super_block *s, | |
bd4c625c | 575 | struct reiserfs_journal_list *jl) |
1da177e4 | 576 | { |
bd4c625c LT |
577 | if (jl->j_refcount < 1) { |
578 | reiserfs_panic(s, "trans id %lu, refcount at %d", | |
579 | jl->j_trans_id, jl->j_refcount); | |
580 | } | |
581 | if (--jl->j_refcount == 0) | |
d739b42b | 582 | kfree(jl); |
1da177e4 LT |
583 | } |
584 | ||
585 | /* | |
586 | ** this used to be much more involved, and I'm keeping it just in case things get ugly again. | |
587 | ** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a | |
588 | ** transaction. | |
589 | */ | |
bd4c625c LT |
590 | static void cleanup_freed_for_journal_list(struct super_block *p_s_sb, |
591 | struct reiserfs_journal_list *jl) | |
592 | { | |
1da177e4 | 593 | |
bd4c625c LT |
594 | struct reiserfs_list_bitmap *jb = jl->j_list_bitmap; |
595 | if (jb) { | |
596 | cleanup_bitmap_list(p_s_sb, jb); | |
597 | } | |
598 | jl->j_list_bitmap->journal_list = NULL; | |
599 | jl->j_list_bitmap = NULL; | |
1da177e4 LT |
600 | } |
601 | ||
602 | static int journal_list_still_alive(struct super_block *s, | |
bd4c625c LT |
603 | unsigned long trans_id) |
604 | { | |
605 | struct reiserfs_journal *journal = SB_JOURNAL(s); | |
606 | struct list_head *entry = &journal->j_journal_list; | |
607 | struct reiserfs_journal_list *jl; | |
608 | ||
609 | if (!list_empty(entry)) { | |
610 | jl = JOURNAL_LIST_ENTRY(entry->next); | |
611 | if (jl->j_trans_id <= trans_id) { | |
612 | return 1; | |
613 | } | |
614 | } | |
615 | return 0; | |
616 | } | |
617 | ||
618 | static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate) | |
619 | { | |
620 | char b[BDEVNAME_SIZE]; | |
621 | ||
622 | if (buffer_journaled(bh)) { | |
623 | reiserfs_warning(NULL, | |
624 | "clm-2084: pinned buffer %lu:%s sent to disk", | |
625 | bh->b_blocknr, bdevname(bh->b_bdev, b)); | |
626 | } | |
627 | if (uptodate) | |
628 | set_buffer_uptodate(bh); | |
629 | else | |
630 | clear_buffer_uptodate(bh); | |
631 | unlock_buffer(bh); | |
632 | put_bh(bh); | |
633 | } | |
634 | ||
635 | static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate) | |
636 | { | |
637 | if (uptodate) | |
638 | set_buffer_uptodate(bh); | |
639 | else | |
640 | clear_buffer_uptodate(bh); | |
641 | unlock_buffer(bh); | |
642 | put_bh(bh); | |
643 | } | |
644 | ||
645 | static void submit_logged_buffer(struct buffer_head *bh) | |
646 | { | |
647 | get_bh(bh); | |
648 | bh->b_end_io = reiserfs_end_buffer_io_sync; | |
649 | clear_buffer_journal_new(bh); | |
650 | clear_buffer_dirty(bh); | |
651 | if (!test_clear_buffer_journal_test(bh)) | |
652 | BUG(); | |
653 | if (!buffer_uptodate(bh)) | |
654 | BUG(); | |
655 | submit_bh(WRITE, bh); | |
656 | } | |
657 | ||
658 | static void submit_ordered_buffer(struct buffer_head *bh) | |
659 | { | |
660 | get_bh(bh); | |
661 | bh->b_end_io = reiserfs_end_ordered_io; | |
662 | clear_buffer_dirty(bh); | |
663 | if (!buffer_uptodate(bh)) | |
664 | BUG(); | |
665 | submit_bh(WRITE, bh); | |
666 | } | |
667 | ||
668 | static int submit_barrier_buffer(struct buffer_head *bh) | |
669 | { | |
670 | get_bh(bh); | |
671 | bh->b_end_io = reiserfs_end_ordered_io; | |
672 | clear_buffer_dirty(bh); | |
673 | if (!buffer_uptodate(bh)) | |
674 | BUG(); | |
675 | return submit_bh(WRITE_BARRIER, bh); | |
1da177e4 LT |
676 | } |
677 | ||
678 | static void check_barrier_completion(struct super_block *s, | |
bd4c625c LT |
679 | struct buffer_head *bh) |
680 | { | |
681 | if (buffer_eopnotsupp(bh)) { | |
682 | clear_buffer_eopnotsupp(bh); | |
683 | disable_barrier(s); | |
684 | set_buffer_uptodate(bh); | |
685 | set_buffer_dirty(bh); | |
686 | sync_dirty_buffer(bh); | |
687 | } | |
1da177e4 LT |
688 | } |
689 | ||
690 | #define CHUNK_SIZE 32 | |
691 | struct buffer_chunk { | |
bd4c625c LT |
692 | struct buffer_head *bh[CHUNK_SIZE]; |
693 | int nr; | |
1da177e4 LT |
694 | }; |
695 | ||
bd4c625c LT |
696 | static void write_chunk(struct buffer_chunk *chunk) |
697 | { | |
698 | int i; | |
699 | get_fs_excl(); | |
700 | for (i = 0; i < chunk->nr; i++) { | |
701 | submit_logged_buffer(chunk->bh[i]); | |
702 | } | |
703 | chunk->nr = 0; | |
704 | put_fs_excl(); | |
1da177e4 LT |
705 | } |
706 | ||
bd4c625c LT |
707 | static void write_ordered_chunk(struct buffer_chunk *chunk) |
708 | { | |
709 | int i; | |
710 | get_fs_excl(); | |
711 | for (i = 0; i < chunk->nr; i++) { | |
712 | submit_ordered_buffer(chunk->bh[i]); | |
713 | } | |
714 | chunk->nr = 0; | |
715 | put_fs_excl(); | |
1da177e4 LT |
716 | } |
717 | ||
718 | static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh, | |
bd4c625c | 719 | spinlock_t * lock, void (fn) (struct buffer_chunk *)) |
1da177e4 | 720 | { |
bd4c625c LT |
721 | int ret = 0; |
722 | if (chunk->nr >= CHUNK_SIZE) | |
723 | BUG(); | |
724 | chunk->bh[chunk->nr++] = bh; | |
725 | if (chunk->nr >= CHUNK_SIZE) { | |
726 | ret = 1; | |
727 | if (lock) | |
728 | spin_unlock(lock); | |
729 | fn(chunk); | |
730 | if (lock) | |
731 | spin_lock(lock); | |
732 | } | |
733 | return ret; | |
1da177e4 LT |
734 | } |
735 | ||
1da177e4 | 736 | static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0); |
bd4c625c LT |
737 | static struct reiserfs_jh *alloc_jh(void) |
738 | { | |
739 | struct reiserfs_jh *jh; | |
740 | while (1) { | |
741 | jh = kmalloc(sizeof(*jh), GFP_NOFS); | |
742 | if (jh) { | |
743 | atomic_inc(&nr_reiserfs_jh); | |
744 | return jh; | |
745 | } | |
746 | yield(); | |
1da177e4 | 747 | } |
1da177e4 LT |
748 | } |
749 | ||
750 | /* | |
751 | * we want to free the jh when the buffer has been written | |
752 | * and waited on | |
753 | */ | |
bd4c625c LT |
754 | void reiserfs_free_jh(struct buffer_head *bh) |
755 | { | |
756 | struct reiserfs_jh *jh; | |
757 | ||
758 | jh = bh->b_private; | |
759 | if (jh) { | |
760 | bh->b_private = NULL; | |
761 | jh->bh = NULL; | |
762 | list_del_init(&jh->list); | |
763 | kfree(jh); | |
764 | if (atomic_read(&nr_reiserfs_jh) <= 0) | |
765 | BUG(); | |
766 | atomic_dec(&nr_reiserfs_jh); | |
767 | put_bh(bh); | |
768 | } | |
1da177e4 LT |
769 | } |
770 | ||
771 | static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh, | |
bd4c625c | 772 | int tail) |
1da177e4 | 773 | { |
bd4c625c | 774 | struct reiserfs_jh *jh; |
1da177e4 | 775 | |
bd4c625c LT |
776 | if (bh->b_private) { |
777 | spin_lock(&j->j_dirty_buffers_lock); | |
778 | if (!bh->b_private) { | |
779 | spin_unlock(&j->j_dirty_buffers_lock); | |
780 | goto no_jh; | |
781 | } | |
782 | jh = bh->b_private; | |
783 | list_del_init(&jh->list); | |
784 | } else { | |
785 | no_jh: | |
786 | get_bh(bh); | |
787 | jh = alloc_jh(); | |
788 | spin_lock(&j->j_dirty_buffers_lock); | |
789 | /* buffer must be locked for __add_jh, should be able to have | |
790 | * two adds at the same time | |
791 | */ | |
792 | if (bh->b_private) | |
793 | BUG(); | |
794 | jh->bh = bh; | |
795 | bh->b_private = jh; | |
1da177e4 | 796 | } |
bd4c625c LT |
797 | jh->jl = j->j_current_jl; |
798 | if (tail) | |
799 | list_add_tail(&jh->list, &jh->jl->j_tail_bh_list); | |
800 | else { | |
801 | list_add_tail(&jh->list, &jh->jl->j_bh_list); | |
802 | } | |
803 | spin_unlock(&j->j_dirty_buffers_lock); | |
804 | return 0; | |
1da177e4 LT |
805 | } |
806 | ||
bd4c625c LT |
807 | int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh) |
808 | { | |
809 | return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1); | |
1da177e4 | 810 | } |
bd4c625c LT |
811 | int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh) |
812 | { | |
813 | return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0); | |
1da177e4 LT |
814 | } |
815 | ||
816 | #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list) | |
bd4c625c | 817 | static int write_ordered_buffers(spinlock_t * lock, |
1da177e4 | 818 | struct reiserfs_journal *j, |
bd4c625c | 819 | struct reiserfs_journal_list *jl, |
1da177e4 LT |
820 | struct list_head *list) |
821 | { | |
bd4c625c LT |
822 | struct buffer_head *bh; |
823 | struct reiserfs_jh *jh; | |
824 | int ret = j->j_errno; | |
825 | struct buffer_chunk chunk; | |
826 | struct list_head tmp; | |
827 | INIT_LIST_HEAD(&tmp); | |
828 | ||
829 | chunk.nr = 0; | |
830 | spin_lock(lock); | |
831 | while (!list_empty(list)) { | |
832 | jh = JH_ENTRY(list->next); | |
833 | bh = jh->bh; | |
834 | get_bh(bh); | |
835 | if (test_set_buffer_locked(bh)) { | |
836 | if (!buffer_dirty(bh)) { | |
837 | list_del_init(&jh->list); | |
838 | list_add(&jh->list, &tmp); | |
839 | goto loop_next; | |
840 | } | |
841 | spin_unlock(lock); | |
842 | if (chunk.nr) | |
843 | write_ordered_chunk(&chunk); | |
844 | wait_on_buffer(bh); | |
845 | cond_resched(); | |
846 | spin_lock(lock); | |
847 | goto loop_next; | |
848 | } | |
849 | if (buffer_dirty(bh)) { | |
850 | list_del_init(&jh->list); | |
851 | list_add(&jh->list, &tmp); | |
852 | add_to_chunk(&chunk, bh, lock, write_ordered_chunk); | |
853 | } else { | |
854 | reiserfs_free_jh(bh); | |
855 | unlock_buffer(bh); | |
856 | } | |
857 | loop_next: | |
858 | put_bh(bh); | |
859 | cond_resched_lock(lock); | |
860 | } | |
861 | if (chunk.nr) { | |
862 | spin_unlock(lock); | |
1da177e4 | 863 | write_ordered_chunk(&chunk); |
bd4c625c | 864 | spin_lock(lock); |
1da177e4 | 865 | } |
bd4c625c LT |
866 | while (!list_empty(&tmp)) { |
867 | jh = JH_ENTRY(tmp.prev); | |
868 | bh = jh->bh; | |
869 | get_bh(bh); | |
870 | reiserfs_free_jh(bh); | |
871 | ||
872 | if (buffer_locked(bh)) { | |
873 | spin_unlock(lock); | |
874 | wait_on_buffer(bh); | |
875 | spin_lock(lock); | |
876 | } | |
877 | if (!buffer_uptodate(bh)) { | |
878 | ret = -EIO; | |
879 | } | |
d62b1b87 CM |
880 | /* ugly interaction with invalidatepage here. |
881 | * reiserfs_invalidate_page will pin any buffer that has a valid | |
882 | * journal head from an older transaction. If someone else sets | |
883 | * our buffer dirty after we write it in the first loop, and | |
884 | * then someone truncates the page away, nobody will ever write | |
885 | * the buffer. We're safe if we write the page one last time | |
886 | * after freeing the journal header. | |
887 | */ | |
888 | if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) { | |
889 | spin_unlock(lock); | |
890 | ll_rw_block(WRITE, 1, &bh); | |
891 | spin_lock(lock); | |
892 | } | |
bd4c625c LT |
893 | put_bh(bh); |
894 | cond_resched_lock(lock); | |
1da177e4 | 895 | } |
bd4c625c LT |
896 | spin_unlock(lock); |
897 | return ret; | |
898 | } | |
1da177e4 | 899 | |
bd4c625c LT |
900 | static int flush_older_commits(struct super_block *s, |
901 | struct reiserfs_journal_list *jl) | |
902 | { | |
903 | struct reiserfs_journal *journal = SB_JOURNAL(s); | |
904 | struct reiserfs_journal_list *other_jl; | |
905 | struct reiserfs_journal_list *first_jl; | |
906 | struct list_head *entry; | |
907 | unsigned long trans_id = jl->j_trans_id; | |
908 | unsigned long other_trans_id; | |
909 | unsigned long first_trans_id; | |
910 | ||
911 | find_first: | |
912 | /* | |
913 | * first we walk backwards to find the oldest uncommitted transation | |
914 | */ | |
915 | first_jl = jl; | |
916 | entry = jl->j_list.prev; | |
917 | while (1) { | |
918 | other_jl = JOURNAL_LIST_ENTRY(entry); | |
919 | if (entry == &journal->j_journal_list || | |
920 | atomic_read(&other_jl->j_older_commits_done)) | |
921 | break; | |
1da177e4 | 922 | |
bd4c625c LT |
923 | first_jl = other_jl; |
924 | entry = other_jl->j_list.prev; | |
925 | } | |
1da177e4 | 926 | |
bd4c625c LT |
927 | /* if we didn't find any older uncommitted transactions, return now */ |
928 | if (first_jl == jl) { | |
929 | return 0; | |
930 | } | |
1da177e4 | 931 | |
bd4c625c LT |
932 | first_trans_id = first_jl->j_trans_id; |
933 | ||
934 | entry = &first_jl->j_list; | |
935 | while (1) { | |
936 | other_jl = JOURNAL_LIST_ENTRY(entry); | |
937 | other_trans_id = other_jl->j_trans_id; | |
938 | ||
939 | if (other_trans_id < trans_id) { | |
940 | if (atomic_read(&other_jl->j_commit_left) != 0) { | |
941 | flush_commit_list(s, other_jl, 0); | |
942 | ||
943 | /* list we were called with is gone, return */ | |
944 | if (!journal_list_still_alive(s, trans_id)) | |
945 | return 1; | |
946 | ||
947 | /* the one we just flushed is gone, this means all | |
948 | * older lists are also gone, so first_jl is no longer | |
949 | * valid either. Go back to the beginning. | |
950 | */ | |
951 | if (!journal_list_still_alive | |
952 | (s, other_trans_id)) { | |
953 | goto find_first; | |
954 | } | |
955 | } | |
956 | entry = entry->next; | |
957 | if (entry == &journal->j_journal_list) | |
958 | return 0; | |
959 | } else { | |
960 | return 0; | |
1da177e4 | 961 | } |
1da177e4 | 962 | } |
bd4c625c | 963 | return 0; |
1da177e4 | 964 | } |
bd4c625c LT |
965 | int reiserfs_async_progress_wait(struct super_block *s) |
966 | { | |
967 | DEFINE_WAIT(wait); | |
968 | struct reiserfs_journal *j = SB_JOURNAL(s); | |
969 | if (atomic_read(&j->j_async_throttle)) | |
970 | blk_congestion_wait(WRITE, HZ / 10); | |
971 | return 0; | |
1da177e4 LT |
972 | } |
973 | ||
974 | /* | |
975 | ** if this journal list still has commit blocks unflushed, send them to disk. | |
976 | ** | |
977 | ** log areas must be flushed in order (transaction 2 can't commit before transaction 1) | |
978 | ** Before the commit block can by written, every other log block must be safely on disk | |
979 | ** | |
980 | */ | |
bd4c625c LT |
981 | static int flush_commit_list(struct super_block *s, |
982 | struct reiserfs_journal_list *jl, int flushall) | |
983 | { | |
984 | int i; | |
985 | int bn; | |
986 | struct buffer_head *tbh = NULL; | |
987 | unsigned long trans_id = jl->j_trans_id; | |
988 | struct reiserfs_journal *journal = SB_JOURNAL(s); | |
989 | int barrier = 0; | |
990 | int retval = 0; | |
991 | ||
992 | reiserfs_check_lock_depth(s, "flush_commit_list"); | |
993 | ||
994 | if (atomic_read(&jl->j_older_commits_done)) { | |
995 | return 0; | |
996 | } | |
997 | ||
998 | get_fs_excl(); | |
999 | ||
1000 | /* before we can put our commit blocks on disk, we have to make sure everyone older than | |
1001 | ** us is on disk too | |
1002 | */ | |
1003 | BUG_ON(jl->j_len <= 0); | |
1004 | BUG_ON(trans_id == journal->j_trans_id); | |
1005 | ||
1006 | get_journal_list(jl); | |
1007 | if (flushall) { | |
1008 | if (flush_older_commits(s, jl) == 1) { | |
1009 | /* list disappeared during flush_older_commits. return */ | |
1010 | goto put_jl; | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | /* make sure nobody is trying to flush this one at the same time */ | |
1015 | down(&jl->j_commit_lock); | |
1016 | if (!journal_list_still_alive(s, trans_id)) { | |
1017 | up(&jl->j_commit_lock); | |
1018 | goto put_jl; | |
1019 | } | |
1020 | BUG_ON(jl->j_trans_id == 0); | |
1021 | ||
1022 | /* this commit is done, exit */ | |
1023 | if (atomic_read(&(jl->j_commit_left)) <= 0) { | |
1024 | if (flushall) { | |
1025 | atomic_set(&(jl->j_older_commits_done), 1); | |
1026 | } | |
1027 | up(&jl->j_commit_lock); | |
1028 | goto put_jl; | |
1029 | } | |
1030 | ||
1031 | if (!list_empty(&jl->j_bh_list)) { | |
1032 | unlock_kernel(); | |
1033 | write_ordered_buffers(&journal->j_dirty_buffers_lock, | |
1034 | journal, jl, &jl->j_bh_list); | |
1035 | lock_kernel(); | |
1036 | } | |
1037 | BUG_ON(!list_empty(&jl->j_bh_list)); | |
1038 | /* | |
1039 | * for the description block and all the log blocks, submit any buffers | |
1040 | * that haven't already reached the disk | |
1041 | */ | |
1042 | atomic_inc(&journal->j_async_throttle); | |
1043 | for (i = 0; i < (jl->j_len + 1); i++) { | |
1044 | bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) % | |
1045 | SB_ONDISK_JOURNAL_SIZE(s); | |
1046 | tbh = journal_find_get_block(s, bn); | |
1047 | if (buffer_dirty(tbh)) /* redundant, ll_rw_block() checks */ | |
53778ffd | 1048 | ll_rw_block(SWRITE, 1, &tbh); |
bd4c625c LT |
1049 | put_bh(tbh); |
1050 | } | |
1051 | atomic_dec(&journal->j_async_throttle); | |
1052 | ||
5d5e8156 JM |
1053 | /* We're skipping the commit if there's an error */ |
1054 | if (retval || reiserfs_is_journal_aborted(journal)) | |
1055 | barrier = 0; | |
1056 | ||
bd4c625c LT |
1057 | /* wait on everything written so far before writing the commit |
1058 | * if we are in barrier mode, send the commit down now | |
1059 | */ | |
1060 | barrier = reiserfs_barrier_flush(s); | |
1061 | if (barrier) { | |
1062 | int ret; | |
1063 | lock_buffer(jl->j_commit_bh); | |
1064 | ret = submit_barrier_buffer(jl->j_commit_bh); | |
1065 | if (ret == -EOPNOTSUPP) { | |
1066 | set_buffer_uptodate(jl->j_commit_bh); | |
1067 | disable_barrier(s); | |
1068 | barrier = 0; | |
1069 | } | |
1070 | } | |
1071 | for (i = 0; i < (jl->j_len + 1); i++) { | |
1072 | bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + | |
1073 | (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s); | |
1074 | tbh = journal_find_get_block(s, bn); | |
1075 | wait_on_buffer(tbh); | |
1076 | // since we're using ll_rw_blk above, it might have skipped over | |
1077 | // a locked buffer. Double check here | |
1078 | // | |
1079 | if (buffer_dirty(tbh)) /* redundant, sync_dirty_buffer() checks */ | |
1080 | sync_dirty_buffer(tbh); | |
1081 | if (unlikely(!buffer_uptodate(tbh))) { | |
1da177e4 | 1082 | #ifdef CONFIG_REISERFS_CHECK |
bd4c625c | 1083 | reiserfs_warning(s, "journal-601, buffer write failed"); |
1da177e4 | 1084 | #endif |
bd4c625c LT |
1085 | retval = -EIO; |
1086 | } | |
1087 | put_bh(tbh); /* once for journal_find_get_block */ | |
1088 | put_bh(tbh); /* once due to original getblk in do_journal_end */ | |
1089 | atomic_dec(&(jl->j_commit_left)); | |
1090 | } | |
1091 | ||
1092 | BUG_ON(atomic_read(&(jl->j_commit_left)) != 1); | |
1093 | ||
1094 | if (!barrier) { | |
5d5e8156 JM |
1095 | /* If there was a write error in the journal - we can't commit |
1096 | * this transaction - it will be invalid and, if successful, | |
1097 | * will just end up propogating the write error out to | |
1098 | * the file system. */ | |
1099 | if (likely(!retval && !reiserfs_is_journal_aborted (journal))) { | |
1100 | if (buffer_dirty(jl->j_commit_bh)) | |
1101 | BUG(); | |
1102 | mark_buffer_dirty(jl->j_commit_bh) ; | |
1103 | sync_dirty_buffer(jl->j_commit_bh) ; | |
1104 | } | |
bd4c625c LT |
1105 | } else |
1106 | wait_on_buffer(jl->j_commit_bh); | |
1107 | ||
1108 | check_barrier_completion(s, jl->j_commit_bh); | |
1109 | ||
1110 | /* If there was a write error in the journal - we can't commit this | |
1111 | * transaction - it will be invalid and, if successful, will just end | |
1112 | * up propogating the write error out to the filesystem. */ | |
1113 | if (unlikely(!buffer_uptodate(jl->j_commit_bh))) { | |
1da177e4 | 1114 | #ifdef CONFIG_REISERFS_CHECK |
bd4c625c | 1115 | reiserfs_warning(s, "journal-615: buffer write failed"); |
1da177e4 | 1116 | #endif |
bd4c625c LT |
1117 | retval = -EIO; |
1118 | } | |
1119 | bforget(jl->j_commit_bh); | |
1120 | if (journal->j_last_commit_id != 0 && | |
1121 | (jl->j_trans_id - journal->j_last_commit_id) != 1) { | |
1122 | reiserfs_warning(s, "clm-2200: last commit %lu, current %lu", | |
1123 | journal->j_last_commit_id, jl->j_trans_id); | |
1124 | } | |
1125 | journal->j_last_commit_id = jl->j_trans_id; | |
1126 | ||
1127 | /* now, every commit block is on the disk. It is safe to allow blocks freed during this transaction to be reallocated */ | |
1128 | cleanup_freed_for_journal_list(s, jl); | |
1129 | ||
1130 | retval = retval ? retval : journal->j_errno; | |
1131 | ||
1132 | /* mark the metadata dirty */ | |
1133 | if (!retval) | |
1134 | dirty_one_transaction(s, jl); | |
1135 | atomic_dec(&(jl->j_commit_left)); | |
1136 | ||
1137 | if (flushall) { | |
1138 | atomic_set(&(jl->j_older_commits_done), 1); | |
1139 | } | |
1140 | up(&jl->j_commit_lock); | |
1141 | put_jl: | |
1142 | put_journal_list(s, jl); | |
1143 | ||
1144 | if (retval) | |
1145 | reiserfs_abort(s, retval, "Journal write error in %s", | |
1146 | __FUNCTION__); | |
1147 | put_fs_excl(); | |
1148 | return retval; | |
1da177e4 LT |
1149 | } |
1150 | ||
1151 | /* | |
1152 | ** flush_journal_list frequently needs to find a newer transaction for a given block. This does that, or | |
1153 | ** returns NULL if it can't find anything | |
1154 | */ | |
bd4c625c LT |
1155 | static struct reiserfs_journal_list *find_newer_jl_for_cn(struct |
1156 | reiserfs_journal_cnode | |
1157 | *cn) | |
1158 | { | |
1159 | struct super_block *sb = cn->sb; | |
1160 | b_blocknr_t blocknr = cn->blocknr; | |
1da177e4 | 1161 | |
bd4c625c LT |
1162 | cn = cn->hprev; |
1163 | while (cn) { | |
1164 | if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) { | |
1165 | return cn->jlist; | |
1166 | } | |
1167 | cn = cn->hprev; | |
1168 | } | |
1169 | return NULL; | |
1da177e4 LT |
1170 | } |
1171 | ||
bd4c625c LT |
1172 | static void remove_journal_hash(struct super_block *, |
1173 | struct reiserfs_journal_cnode **, | |
1174 | struct reiserfs_journal_list *, unsigned long, | |
1175 | int); | |
1da177e4 LT |
1176 | |
1177 | /* | |
1178 | ** once all the real blocks have been flushed, it is safe to remove them from the | |
1179 | ** journal list for this transaction. Aside from freeing the cnode, this also allows the | |
1180 | ** block to be reallocated for data blocks if it had been deleted. | |
1181 | */ | |
bd4c625c LT |
1182 | static void remove_all_from_journal_list(struct super_block *p_s_sb, |
1183 | struct reiserfs_journal_list *jl, | |
1184 | int debug) | |
1185 | { | |
1186 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
1187 | struct reiserfs_journal_cnode *cn, *last; | |
1188 | cn = jl->j_realblock; | |
1189 | ||
1190 | /* which is better, to lock once around the whole loop, or | |
1191 | ** to lock for each call to remove_journal_hash? | |
1192 | */ | |
1193 | while (cn) { | |
1194 | if (cn->blocknr != 0) { | |
1195 | if (debug) { | |
1196 | reiserfs_warning(p_s_sb, | |
1197 | "block %u, bh is %d, state %ld", | |
1198 | cn->blocknr, cn->bh ? 1 : 0, | |
1199 | cn->state); | |
1200 | } | |
1201 | cn->state = 0; | |
1202 | remove_journal_hash(p_s_sb, journal->j_list_hash_table, | |
1203 | jl, cn->blocknr, 1); | |
1204 | } | |
1205 | last = cn; | |
1206 | cn = cn->next; | |
1207 | free_cnode(p_s_sb, last); | |
1208 | } | |
1209 | jl->j_realblock = NULL; | |
1da177e4 LT |
1210 | } |
1211 | ||
1212 | /* | |
1213 | ** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block. | |
1214 | ** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start | |
1215 | ** releasing blocks in this transaction for reuse as data blocks. | |
1216 | ** called by flush_journal_list, before it calls remove_all_from_journal_list | |
1217 | ** | |
1218 | */ | |
bd4c625c LT |
1219 | static int _update_journal_header_block(struct super_block *p_s_sb, |
1220 | unsigned long offset, | |
1221 | unsigned long trans_id) | |
1222 | { | |
1223 | struct reiserfs_journal_header *jh; | |
1224 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
1da177e4 | 1225 | |
bd4c625c LT |
1226 | if (reiserfs_is_journal_aborted(journal)) |
1227 | return -EIO; | |
1da177e4 | 1228 | |
bd4c625c LT |
1229 | if (trans_id >= journal->j_last_flush_trans_id) { |
1230 | if (buffer_locked((journal->j_header_bh))) { | |
1231 | wait_on_buffer((journal->j_header_bh)); | |
1232 | if (unlikely(!buffer_uptodate(journal->j_header_bh))) { | |
1da177e4 | 1233 | #ifdef CONFIG_REISERFS_CHECK |
bd4c625c LT |
1234 | reiserfs_warning(p_s_sb, |
1235 | "journal-699: buffer write failed"); | |
1da177e4 | 1236 | #endif |
bd4c625c LT |
1237 | return -EIO; |
1238 | } | |
1239 | } | |
1240 | journal->j_last_flush_trans_id = trans_id; | |
1241 | journal->j_first_unflushed_offset = offset; | |
1242 | jh = (struct reiserfs_journal_header *)(journal->j_header_bh-> | |
1243 | b_data); | |
1244 | jh->j_last_flush_trans_id = cpu_to_le32(trans_id); | |
1245 | jh->j_first_unflushed_offset = cpu_to_le32(offset); | |
1246 | jh->j_mount_id = cpu_to_le32(journal->j_mount_id); | |
1247 | ||
1248 | if (reiserfs_barrier_flush(p_s_sb)) { | |
1249 | int ret; | |
1250 | lock_buffer(journal->j_header_bh); | |
1251 | ret = submit_barrier_buffer(journal->j_header_bh); | |
1252 | if (ret == -EOPNOTSUPP) { | |
1253 | set_buffer_uptodate(journal->j_header_bh); | |
1254 | disable_barrier(p_s_sb); | |
1255 | goto sync; | |
1256 | } | |
1257 | wait_on_buffer(journal->j_header_bh); | |
1258 | check_barrier_completion(p_s_sb, journal->j_header_bh); | |
1259 | } else { | |
1260 | sync: | |
1261 | set_buffer_dirty(journal->j_header_bh); | |
1262 | sync_dirty_buffer(journal->j_header_bh); | |
1263 | } | |
1264 | if (!buffer_uptodate(journal->j_header_bh)) { | |
1265 | reiserfs_warning(p_s_sb, | |
1266 | "journal-837: IO error during journal replay"); | |
1267 | return -EIO; | |
1268 | } | |
1269 | } | |
1270 | return 0; | |
1271 | } | |
1272 | ||
1273 | static int update_journal_header_block(struct super_block *p_s_sb, | |
1274 | unsigned long offset, | |
1275 | unsigned long trans_id) | |
1276 | { | |
1277 | return _update_journal_header_block(p_s_sb, offset, trans_id); | |
1da177e4 | 1278 | } |
bd4c625c | 1279 | |
1da177e4 LT |
1280 | /* |
1281 | ** flush any and all journal lists older than you are | |
1282 | ** can only be called from flush_journal_list | |
1283 | */ | |
1284 | static int flush_older_journal_lists(struct super_block *p_s_sb, | |
bd4c625c LT |
1285 | struct reiserfs_journal_list *jl) |
1286 | { | |
1287 | struct list_head *entry; | |
1288 | struct reiserfs_journal_list *other_jl; | |
1289 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
1290 | unsigned long trans_id = jl->j_trans_id; | |
1291 | ||
1292 | /* we know we are the only ones flushing things, no extra race | |
1293 | * protection is required. | |
1294 | */ | |
1295 | restart: | |
1296 | entry = journal->j_journal_list.next; | |
1297 | /* Did we wrap? */ | |
1298 | if (entry == &journal->j_journal_list) | |
1299 | return 0; | |
1300 | other_jl = JOURNAL_LIST_ENTRY(entry); | |
1301 | if (other_jl->j_trans_id < trans_id) { | |
1302 | BUG_ON(other_jl->j_refcount <= 0); | |
1303 | /* do not flush all */ | |
1304 | flush_journal_list(p_s_sb, other_jl, 0); | |
1305 | ||
1306 | /* other_jl is now deleted from the list */ | |
1307 | goto restart; | |
1308 | } | |
1309 | return 0; | |
1da177e4 LT |
1310 | } |
1311 | ||
1312 | static void del_from_work_list(struct super_block *s, | |
bd4c625c LT |
1313 | struct reiserfs_journal_list *jl) |
1314 | { | |
1315 | struct reiserfs_journal *journal = SB_JOURNAL(s); | |
1316 | if (!list_empty(&jl->j_working_list)) { | |
1317 | list_del_init(&jl->j_working_list); | |
1318 | journal->j_num_work_lists--; | |
1319 | } | |
1da177e4 LT |
1320 | } |
1321 | ||
1322 | /* flush a journal list, both commit and real blocks | |
1323 | ** | |
1324 | ** always set flushall to 1, unless you are calling from inside | |
1325 | ** flush_journal_list | |
1326 | ** | |
1327 | ** IMPORTANT. This can only be called while there are no journal writers, | |
1328 | ** and the journal is locked. That means it can only be called from | |
1329 | ** do_journal_end, or by journal_release | |
1330 | */ | |
bd4c625c LT |
1331 | static int flush_journal_list(struct super_block *s, |
1332 | struct reiserfs_journal_list *jl, int flushall) | |
1da177e4 | 1333 | { |
bd4c625c LT |
1334 | struct reiserfs_journal_list *pjl; |
1335 | struct reiserfs_journal_cnode *cn, *last; | |
1336 | int count; | |
1337 | int was_jwait = 0; | |
1338 | int was_dirty = 0; | |
1339 | struct buffer_head *saved_bh; | |
1340 | unsigned long j_len_saved = jl->j_len; | |
1341 | struct reiserfs_journal *journal = SB_JOURNAL(s); | |
1342 | int err = 0; | |
1343 | ||
1344 | BUG_ON(j_len_saved <= 0); | |
1345 | ||
1346 | if (atomic_read(&journal->j_wcount) != 0) { | |
1347 | reiserfs_warning(s, | |
1348 | "clm-2048: flush_journal_list called with wcount %d", | |
1349 | atomic_read(&journal->j_wcount)); | |
1350 | } | |
1351 | BUG_ON(jl->j_trans_id == 0); | |
1da177e4 | 1352 | |
bd4c625c LT |
1353 | /* if flushall == 0, the lock is already held */ |
1354 | if (flushall) { | |
1355 | down(&journal->j_flush_sem); | |
1356 | } else if (!down_trylock(&journal->j_flush_sem)) { | |
1357 | BUG(); | |
1358 | } | |
1da177e4 | 1359 | |
bd4c625c LT |
1360 | count = 0; |
1361 | if (j_len_saved > journal->j_trans_max) { | |
1362 | reiserfs_panic(s, | |
1363 | "journal-715: flush_journal_list, length is %lu, trans id %lu\n", | |
1364 | j_len_saved, jl->j_trans_id); | |
1365 | return 0; | |
1366 | } | |
1da177e4 | 1367 | |
bd4c625c LT |
1368 | get_fs_excl(); |
1369 | ||
1370 | /* if all the work is already done, get out of here */ | |
1371 | if (atomic_read(&(jl->j_nonzerolen)) <= 0 && | |
1372 | atomic_read(&(jl->j_commit_left)) <= 0) { | |
1373 | goto flush_older_and_return; | |
1374 | } | |
1375 | ||
1376 | /* start by putting the commit list on disk. This will also flush | |
1377 | ** the commit lists of any olders transactions | |
1378 | */ | |
1379 | flush_commit_list(s, jl, 1); | |
1380 | ||
1381 | if (!(jl->j_state & LIST_DIRTY) | |
1382 | && !reiserfs_is_journal_aborted(journal)) | |
1383 | BUG(); | |
1384 | ||
1385 | /* are we done now? */ | |
1386 | if (atomic_read(&(jl->j_nonzerolen)) <= 0 && | |
1387 | atomic_read(&(jl->j_commit_left)) <= 0) { | |
1388 | goto flush_older_and_return; | |
1389 | } | |
1390 | ||
1391 | /* loop through each cnode, see if we need to write it, | |
1392 | ** or wait on a more recent transaction, or just ignore it | |
1393 | */ | |
1394 | if (atomic_read(&(journal->j_wcount)) != 0) { | |
1395 | reiserfs_panic(s, | |
1396 | "journal-844: panic journal list is flushing, wcount is not 0\n"); | |
1397 | } | |
1398 | cn = jl->j_realblock; | |
1399 | while (cn) { | |
1400 | was_jwait = 0; | |
1401 | was_dirty = 0; | |
1402 | saved_bh = NULL; | |
1403 | /* blocknr of 0 is no longer in the hash, ignore it */ | |
1404 | if (cn->blocknr == 0) { | |
1405 | goto free_cnode; | |
1406 | } | |
1407 | ||
1408 | /* This transaction failed commit. Don't write out to the disk */ | |
1409 | if (!(jl->j_state & LIST_DIRTY)) | |
1410 | goto free_cnode; | |
1411 | ||
1412 | pjl = find_newer_jl_for_cn(cn); | |
1413 | /* the order is important here. We check pjl to make sure we | |
1414 | ** don't clear BH_JDirty_wait if we aren't the one writing this | |
1415 | ** block to disk | |
1416 | */ | |
1417 | if (!pjl && cn->bh) { | |
1418 | saved_bh = cn->bh; | |
1419 | ||
1420 | /* we do this to make sure nobody releases the buffer while | |
1421 | ** we are working with it | |
1422 | */ | |
1423 | get_bh(saved_bh); | |
1424 | ||
1425 | if (buffer_journal_dirty(saved_bh)) { | |
1426 | BUG_ON(!can_dirty(cn)); | |
1427 | was_jwait = 1; | |
1428 | was_dirty = 1; | |
1429 | } else if (can_dirty(cn)) { | |
1430 | /* everything with !pjl && jwait should be writable */ | |
1431 | BUG(); | |
1432 | } | |
1433 | } | |
1434 | ||
1435 | /* if someone has this block in a newer transaction, just make | |
1436 | ** sure they are commited, and don't try writing it to disk | |
1437 | */ | |
1438 | if (pjl) { | |
1439 | if (atomic_read(&pjl->j_commit_left)) | |
1440 | flush_commit_list(s, pjl, 1); | |
1441 | goto free_cnode; | |
1442 | } | |
1443 | ||
1444 | /* bh == NULL when the block got to disk on its own, OR, | |
1445 | ** the block got freed in a future transaction | |
1446 | */ | |
1447 | if (saved_bh == NULL) { | |
1448 | goto free_cnode; | |
1449 | } | |
1450 | ||
1451 | /* this should never happen. kupdate_one_transaction has this list | |
1452 | ** locked while it works, so we should never see a buffer here that | |
1453 | ** is not marked JDirty_wait | |
1454 | */ | |
1455 | if ((!was_jwait) && !buffer_locked(saved_bh)) { | |
1456 | reiserfs_warning(s, | |
1457 | "journal-813: BAD! buffer %llu %cdirty %cjwait, " | |
1458 | "not in a newer tranasction", | |
1459 | (unsigned long long)saved_bh-> | |
1460 | b_blocknr, was_dirty ? ' ' : '!', | |
1461 | was_jwait ? ' ' : '!'); | |
1462 | } | |
1463 | if (was_dirty) { | |
1464 | /* we inc again because saved_bh gets decremented at free_cnode */ | |
1465 | get_bh(saved_bh); | |
1466 | set_bit(BLOCK_NEEDS_FLUSH, &cn->state); | |
1467 | lock_buffer(saved_bh); | |
1468 | BUG_ON(cn->blocknr != saved_bh->b_blocknr); | |
1469 | if (buffer_dirty(saved_bh)) | |
1470 | submit_logged_buffer(saved_bh); | |
1471 | else | |
1472 | unlock_buffer(saved_bh); | |
1473 | count++; | |
1474 | } else { | |
1475 | reiserfs_warning(s, | |
1476 | "clm-2082: Unable to flush buffer %llu in %s", | |
1477 | (unsigned long long)saved_bh-> | |
1478 | b_blocknr, __FUNCTION__); | |
1479 | } | |
1480 | free_cnode: | |
1481 | last = cn; | |
1482 | cn = cn->next; | |
1483 | if (saved_bh) { | |
1484 | /* we incremented this to keep others from taking the buffer head away */ | |
1485 | put_bh(saved_bh); | |
1486 | if (atomic_read(&(saved_bh->b_count)) < 0) { | |
1487 | reiserfs_warning(s, | |
1488 | "journal-945: saved_bh->b_count < 0"); | |
1489 | } | |
1490 | } | |
1491 | } | |
1492 | if (count > 0) { | |
1493 | cn = jl->j_realblock; | |
1494 | while (cn) { | |
1495 | if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) { | |
1496 | if (!cn->bh) { | |
1497 | reiserfs_panic(s, | |
1498 | "journal-1011: cn->bh is NULL\n"); | |
1499 | } | |
1500 | wait_on_buffer(cn->bh); | |
1501 | if (!cn->bh) { | |
1502 | reiserfs_panic(s, | |
1503 | "journal-1012: cn->bh is NULL\n"); | |
1504 | } | |
1505 | if (unlikely(!buffer_uptodate(cn->bh))) { | |
1506 | #ifdef CONFIG_REISERFS_CHECK | |
1507 | reiserfs_warning(s, | |
1508 | "journal-949: buffer write failed\n"); | |
1509 | #endif | |
1510 | err = -EIO; | |
1511 | } | |
1512 | /* note, we must clear the JDirty_wait bit after the up to date | |
1513 | ** check, otherwise we race against our flushpage routine | |
1514 | */ | |
1515 | BUG_ON(!test_clear_buffer_journal_dirty | |
1516 | (cn->bh)); | |
1517 | ||
1518 | /* undo the inc from journal_mark_dirty */ | |
1519 | put_bh(cn->bh); | |
1520 | brelse(cn->bh); | |
1521 | } | |
1522 | cn = cn->next; | |
1523 | } | |
1524 | } | |
1525 | ||
1526 | if (err) | |
1527 | reiserfs_abort(s, -EIO, | |
1528 | "Write error while pushing transaction to disk in %s", | |
1529 | __FUNCTION__); | |
1530 | flush_older_and_return: | |
1531 | ||
1532 | /* before we can update the journal header block, we _must_ flush all | |
1533 | ** real blocks from all older transactions to disk. This is because | |
1534 | ** once the header block is updated, this transaction will not be | |
1535 | ** replayed after a crash | |
1536 | */ | |
1537 | if (flushall) { | |
1538 | flush_older_journal_lists(s, jl); | |
1539 | } | |
1540 | ||
1541 | err = journal->j_errno; | |
1542 | /* before we can remove everything from the hash tables for this | |
1543 | ** transaction, we must make sure it can never be replayed | |
1544 | ** | |
1545 | ** since we are only called from do_journal_end, we know for sure there | |
1546 | ** are no allocations going on while we are flushing journal lists. So, | |
1547 | ** we only need to update the journal header block for the last list | |
1548 | ** being flushed | |
1549 | */ | |
1550 | if (!err && flushall) { | |
1551 | err = | |
1552 | update_journal_header_block(s, | |
1553 | (jl->j_start + jl->j_len + | |
1554 | 2) % SB_ONDISK_JOURNAL_SIZE(s), | |
1555 | jl->j_trans_id); | |
1556 | if (err) | |
1557 | reiserfs_abort(s, -EIO, | |
1558 | "Write error while updating journal header in %s", | |
1559 | __FUNCTION__); | |
1560 | } | |
1561 | remove_all_from_journal_list(s, jl, 0); | |
1562 | list_del_init(&jl->j_list); | |
1563 | journal->j_num_lists--; | |
1564 | del_from_work_list(s, jl); | |
1565 | ||
1566 | if (journal->j_last_flush_id != 0 && | |
1567 | (jl->j_trans_id - journal->j_last_flush_id) != 1) { | |
1568 | reiserfs_warning(s, "clm-2201: last flush %lu, current %lu", | |
1569 | journal->j_last_flush_id, jl->j_trans_id); | |
1570 | } | |
1571 | journal->j_last_flush_id = jl->j_trans_id; | |
1572 | ||
1573 | /* not strictly required since we are freeing the list, but it should | |
1574 | * help find code using dead lists later on | |
1575 | */ | |
1576 | jl->j_len = 0; | |
1577 | atomic_set(&(jl->j_nonzerolen), 0); | |
1578 | jl->j_start = 0; | |
1579 | jl->j_realblock = NULL; | |
1580 | jl->j_commit_bh = NULL; | |
1581 | jl->j_trans_id = 0; | |
1582 | jl->j_state = 0; | |
1583 | put_journal_list(s, jl); | |
1584 | if (flushall) | |
1585 | up(&journal->j_flush_sem); | |
1586 | put_fs_excl(); | |
1587 | return err; | |
1588 | } | |
1589 | ||
1590 | static int write_one_transaction(struct super_block *s, | |
1591 | struct reiserfs_journal_list *jl, | |
1592 | struct buffer_chunk *chunk) | |
1593 | { | |
1594 | struct reiserfs_journal_cnode *cn; | |
1595 | int ret = 0; | |
1596 | ||
1597 | jl->j_state |= LIST_TOUCHED; | |
1598 | del_from_work_list(s, jl); | |
1599 | if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) { | |
1600 | return 0; | |
1601 | } | |
1602 | ||
1603 | cn = jl->j_realblock; | |
1604 | while (cn) { | |
1605 | /* if the blocknr == 0, this has been cleared from the hash, | |
1606 | ** skip it | |
1607 | */ | |
1608 | if (cn->blocknr == 0) { | |
1609 | goto next; | |
1610 | } | |
1611 | if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) { | |
1612 | struct buffer_head *tmp_bh; | |
1613 | /* we can race against journal_mark_freed when we try | |
1614 | * to lock_buffer(cn->bh), so we have to inc the buffer | |
1615 | * count, and recheck things after locking | |
1616 | */ | |
1617 | tmp_bh = cn->bh; | |
1618 | get_bh(tmp_bh); | |
1619 | lock_buffer(tmp_bh); | |
1620 | if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) { | |
1621 | if (!buffer_journal_dirty(tmp_bh) || | |
1622 | buffer_journal_prepared(tmp_bh)) | |
1623 | BUG(); | |
1624 | add_to_chunk(chunk, tmp_bh, NULL, write_chunk); | |
1625 | ret++; | |
1626 | } else { | |
1627 | /* note, cn->bh might be null now */ | |
1628 | unlock_buffer(tmp_bh); | |
1629 | } | |
1630 | put_bh(tmp_bh); | |
1631 | } | |
1632 | next: | |
1633 | cn = cn->next; | |
1634 | cond_resched(); | |
1635 | } | |
1636 | return ret; | |
1637 | } | |
1638 | ||
1639 | /* used by flush_commit_list */ | |
1640 | static int dirty_one_transaction(struct super_block *s, | |
1641 | struct reiserfs_journal_list *jl) | |
1642 | { | |
1643 | struct reiserfs_journal_cnode *cn; | |
1644 | struct reiserfs_journal_list *pjl; | |
1645 | int ret = 0; | |
1646 | ||
1647 | jl->j_state |= LIST_DIRTY; | |
1648 | cn = jl->j_realblock; | |
1649 | while (cn) { | |
1650 | /* look for a more recent transaction that logged this | |
1651 | ** buffer. Only the most recent transaction with a buffer in | |
1652 | ** it is allowed to send that buffer to disk | |
1653 | */ | |
1654 | pjl = find_newer_jl_for_cn(cn); | |
1655 | if (!pjl && cn->blocknr && cn->bh | |
1656 | && buffer_journal_dirty(cn->bh)) { | |
1657 | BUG_ON(!can_dirty(cn)); | |
1658 | /* if the buffer is prepared, it will either be logged | |
1659 | * or restored. If restored, we need to make sure | |
1660 | * it actually gets marked dirty | |
1661 | */ | |
1662 | clear_buffer_journal_new(cn->bh); | |
1663 | if (buffer_journal_prepared(cn->bh)) { | |
1664 | set_buffer_journal_restore_dirty(cn->bh); | |
1665 | } else { | |
1666 | set_buffer_journal_test(cn->bh); | |
1667 | mark_buffer_dirty(cn->bh); | |
1668 | } | |
1669 | } | |
1670 | cn = cn->next; | |
1671 | } | |
1672 | return ret; | |
1673 | } | |
1674 | ||
1675 | static int kupdate_transactions(struct super_block *s, | |
1676 | struct reiserfs_journal_list *jl, | |
1677 | struct reiserfs_journal_list **next_jl, | |
1678 | unsigned long *next_trans_id, | |
1679 | int num_blocks, int num_trans) | |
1680 | { | |
1681 | int ret = 0; | |
1682 | int written = 0; | |
1683 | int transactions_flushed = 0; | |
1684 | unsigned long orig_trans_id = jl->j_trans_id; | |
1685 | struct buffer_chunk chunk; | |
1686 | struct list_head *entry; | |
1687 | struct reiserfs_journal *journal = SB_JOURNAL(s); | |
1688 | chunk.nr = 0; | |
1689 | ||
1690 | down(&journal->j_flush_sem); | |
1691 | if (!journal_list_still_alive(s, orig_trans_id)) { | |
1692 | goto done; | |
1693 | } | |
1694 | ||
1695 | /* we've got j_flush_sem held, nobody is going to delete any | |
1696 | * of these lists out from underneath us | |
1697 | */ | |
1698 | while ((num_trans && transactions_flushed < num_trans) || | |
1699 | (!num_trans && written < num_blocks)) { | |
1700 | ||
1701 | if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) || | |
1702 | atomic_read(&jl->j_commit_left) | |
1703 | || !(jl->j_state & LIST_DIRTY)) { | |
1704 | del_from_work_list(s, jl); | |
1705 | break; | |
1706 | } | |
1707 | ret = write_one_transaction(s, jl, &chunk); | |
1708 | ||
1709 | if (ret < 0) | |
1710 | goto done; | |
1711 | transactions_flushed++; | |
1712 | written += ret; | |
1713 | entry = jl->j_list.next; | |
1714 | ||
1715 | /* did we wrap? */ | |
1716 | if (entry == &journal->j_journal_list) { | |
1717 | break; | |
1718 | } | |
1719 | jl = JOURNAL_LIST_ENTRY(entry); | |
1720 | ||
1721 | /* don't bother with older transactions */ | |
1722 | if (jl->j_trans_id <= orig_trans_id) | |
1723 | break; | |
1724 | } | |
1725 | if (chunk.nr) { | |
1726 | write_chunk(&chunk); | |
1727 | } | |
1728 | ||
1729 | done: | |
1730 | up(&journal->j_flush_sem); | |
1731 | return ret; | |
1732 | } | |
1733 | ||
1734 | /* for o_sync and fsync heavy applications, they tend to use | |
1735 | ** all the journa list slots with tiny transactions. These | |
1736 | ** trigger lots and lots of calls to update the header block, which | |
1737 | ** adds seeks and slows things down. | |
1738 | ** | |
1739 | ** This function tries to clear out a large chunk of the journal lists | |
1740 | ** at once, which makes everything faster since only the newest journal | |
1da177e4 LT |
1741 | ** list updates the header block |
1742 | */ | |
1743 | static int flush_used_journal_lists(struct super_block *s, | |
bd4c625c LT |
1744 | struct reiserfs_journal_list *jl) |
1745 | { | |
1746 | unsigned long len = 0; | |
1747 | unsigned long cur_len; | |
1748 | int ret; | |
1749 | int i; | |
1750 | int limit = 256; | |
1751 | struct reiserfs_journal_list *tjl; | |
1752 | struct reiserfs_journal_list *flush_jl; | |
1753 | unsigned long trans_id; | |
1754 | struct reiserfs_journal *journal = SB_JOURNAL(s); | |
1755 | ||
1756 | flush_jl = tjl = jl; | |
1757 | ||
1758 | /* in data logging mode, try harder to flush a lot of blocks */ | |
1759 | if (reiserfs_data_log(s)) | |
1760 | limit = 1024; | |
1761 | /* flush for 256 transactions or limit blocks, whichever comes first */ | |
1762 | for (i = 0; i < 256 && len < limit; i++) { | |
1763 | if (atomic_read(&tjl->j_commit_left) || | |
1764 | tjl->j_trans_id < jl->j_trans_id) { | |
1765 | break; | |
1766 | } | |
1767 | cur_len = atomic_read(&tjl->j_nonzerolen); | |
1768 | if (cur_len > 0) { | |
1769 | tjl->j_state &= ~LIST_TOUCHED; | |
1770 | } | |
1771 | len += cur_len; | |
1772 | flush_jl = tjl; | |
1773 | if (tjl->j_list.next == &journal->j_journal_list) | |
1774 | break; | |
1775 | tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next); | |
1776 | } | |
1777 | /* try to find a group of blocks we can flush across all the | |
1778 | ** transactions, but only bother if we've actually spanned | |
1779 | ** across multiple lists | |
1780 | */ | |
1781 | if (flush_jl != jl) { | |
1782 | ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i); | |
1783 | } | |
1784 | flush_journal_list(s, flush_jl, 1); | |
1785 | return 0; | |
1da177e4 LT |
1786 | } |
1787 | ||
1788 | /* | |
1789 | ** removes any nodes in table with name block and dev as bh. | |
1790 | ** only touchs the hnext and hprev pointers. | |
1791 | */ | |
1792 | void remove_journal_hash(struct super_block *sb, | |
bd4c625c LT |
1793 | struct reiserfs_journal_cnode **table, |
1794 | struct reiserfs_journal_list *jl, | |
1795 | unsigned long block, int remove_freed) | |
1796 | { | |
1797 | struct reiserfs_journal_cnode *cur; | |
1798 | struct reiserfs_journal_cnode **head; | |
1799 | ||
1800 | head = &(journal_hash(table, sb, block)); | |
1801 | if (!head) { | |
1802 | return; | |
1803 | } | |
1804 | cur = *head; | |
1805 | while (cur) { | |
1806 | if (cur->blocknr == block && cur->sb == sb | |
1807 | && (jl == NULL || jl == cur->jlist) | |
1808 | && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) { | |
1809 | if (cur->hnext) { | |
1810 | cur->hnext->hprev = cur->hprev; | |
1811 | } | |
1812 | if (cur->hprev) { | |
1813 | cur->hprev->hnext = cur->hnext; | |
1814 | } else { | |
1815 | *head = cur->hnext; | |
1816 | } | |
1817 | cur->blocknr = 0; | |
1818 | cur->sb = NULL; | |
1819 | cur->state = 0; | |
1820 | if (cur->bh && cur->jlist) /* anybody who clears the cur->bh will also dec the nonzerolen */ | |
1821 | atomic_dec(&(cur->jlist->j_nonzerolen)); | |
1822 | cur->bh = NULL; | |
1823 | cur->jlist = NULL; | |
1824 | } | |
1825 | cur = cur->hnext; | |
1826 | } | |
1827 | } | |
1828 | ||
1829 | static void free_journal_ram(struct super_block *p_s_sb) | |
1830 | { | |
1831 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
d739b42b | 1832 | kfree(journal->j_current_jl); |
bd4c625c LT |
1833 | journal->j_num_lists--; |
1834 | ||
1835 | vfree(journal->j_cnode_free_orig); | |
1836 | free_list_bitmaps(p_s_sb, journal->j_list_bitmap); | |
1837 | free_bitmap_nodes(p_s_sb); /* must be after free_list_bitmaps */ | |
1838 | if (journal->j_header_bh) { | |
1839 | brelse(journal->j_header_bh); | |
1840 | } | |
1841 | /* j_header_bh is on the journal dev, make sure not to release the journal | |
1842 | * dev until we brelse j_header_bh | |
1843 | */ | |
1844 | release_journal_dev(p_s_sb, journal); | |
1845 | vfree(journal); | |
1da177e4 LT |
1846 | } |
1847 | ||
1848 | /* | |
1849 | ** call on unmount. Only set error to 1 if you haven't made your way out | |
1850 | ** of read_super() yet. Any other caller must keep error at 0. | |
1851 | */ | |
bd4c625c LT |
1852 | static int do_journal_release(struct reiserfs_transaction_handle *th, |
1853 | struct super_block *p_s_sb, int error) | |
1854 | { | |
1855 | struct reiserfs_transaction_handle myth; | |
1856 | int flushed = 0; | |
1857 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
1858 | ||
1859 | /* we only want to flush out transactions if we were called with error == 0 | |
1860 | */ | |
1861 | if (!error && !(p_s_sb->s_flags & MS_RDONLY)) { | |
1862 | /* end the current trans */ | |
1863 | BUG_ON(!th->t_trans_id); | |
1864 | do_journal_end(th, p_s_sb, 10, FLUSH_ALL); | |
1865 | ||
1866 | /* make sure something gets logged to force our way into the flush code */ | |
1867 | if (!journal_join(&myth, p_s_sb, 1)) { | |
1868 | reiserfs_prepare_for_journal(p_s_sb, | |
1869 | SB_BUFFER_WITH_SB(p_s_sb), | |
1870 | 1); | |
1871 | journal_mark_dirty(&myth, p_s_sb, | |
1872 | SB_BUFFER_WITH_SB(p_s_sb)); | |
1873 | do_journal_end(&myth, p_s_sb, 1, FLUSH_ALL); | |
1874 | flushed = 1; | |
1875 | } | |
1876 | } | |
1877 | ||
1878 | /* this also catches errors during the do_journal_end above */ | |
1879 | if (!error && reiserfs_is_journal_aborted(journal)) { | |
1880 | memset(&myth, 0, sizeof(myth)); | |
1881 | if (!journal_join_abort(&myth, p_s_sb, 1)) { | |
1882 | reiserfs_prepare_for_journal(p_s_sb, | |
1883 | SB_BUFFER_WITH_SB(p_s_sb), | |
1884 | 1); | |
1885 | journal_mark_dirty(&myth, p_s_sb, | |
1886 | SB_BUFFER_WITH_SB(p_s_sb)); | |
1887 | do_journal_end(&myth, p_s_sb, 1, FLUSH_ALL); | |
1888 | } | |
1889 | } | |
1890 | ||
1891 | reiserfs_mounted_fs_count--; | |
1892 | /* wait for all commits to finish */ | |
1893 | cancel_delayed_work(&SB_JOURNAL(p_s_sb)->j_work); | |
1894 | flush_workqueue(commit_wq); | |
1895 | if (!reiserfs_mounted_fs_count) { | |
1896 | destroy_workqueue(commit_wq); | |
1897 | commit_wq = NULL; | |
1898 | } | |
1899 | ||
1900 | free_journal_ram(p_s_sb); | |
1901 | ||
1902 | return 0; | |
1da177e4 LT |
1903 | } |
1904 | ||
1905 | /* | |
1906 | ** call on unmount. flush all journal trans, release all alloc'd ram | |
1907 | */ | |
bd4c625c LT |
1908 | int journal_release(struct reiserfs_transaction_handle *th, |
1909 | struct super_block *p_s_sb) | |
1910 | { | |
1911 | return do_journal_release(th, p_s_sb, 0); | |
1da177e4 | 1912 | } |
bd4c625c | 1913 | |
1da177e4 LT |
1914 | /* |
1915 | ** only call from an error condition inside reiserfs_read_super! | |
1916 | */ | |
bd4c625c LT |
1917 | int journal_release_error(struct reiserfs_transaction_handle *th, |
1918 | struct super_block *p_s_sb) | |
1919 | { | |
1920 | return do_journal_release(th, p_s_sb, 1); | |
1da177e4 LT |
1921 | } |
1922 | ||
1923 | /* compares description block with commit block. returns 1 if they differ, 0 if they are the same */ | |
bd4c625c LT |
1924 | static int journal_compare_desc_commit(struct super_block *p_s_sb, |
1925 | struct reiserfs_journal_desc *desc, | |
1926 | struct reiserfs_journal_commit *commit) | |
1927 | { | |
1928 | if (get_commit_trans_id(commit) != get_desc_trans_id(desc) || | |
1929 | get_commit_trans_len(commit) != get_desc_trans_len(desc) || | |
1930 | get_commit_trans_len(commit) > SB_JOURNAL(p_s_sb)->j_trans_max || | |
1931 | get_commit_trans_len(commit) <= 0) { | |
1932 | return 1; | |
1933 | } | |
1934 | return 0; | |
1da177e4 | 1935 | } |
bd4c625c | 1936 | |
1da177e4 LT |
1937 | /* returns 0 if it did not find a description block |
1938 | ** returns -1 if it found a corrupt commit block | |
1939 | ** returns 1 if both desc and commit were valid | |
1940 | */ | |
bd4c625c LT |
1941 | static int journal_transaction_is_valid(struct super_block *p_s_sb, |
1942 | struct buffer_head *d_bh, | |
1943 | unsigned long *oldest_invalid_trans_id, | |
1944 | unsigned long *newest_mount_id) | |
1945 | { | |
1946 | struct reiserfs_journal_desc *desc; | |
1947 | struct reiserfs_journal_commit *commit; | |
1948 | struct buffer_head *c_bh; | |
1949 | unsigned long offset; | |
1950 | ||
1951 | if (!d_bh) | |
1952 | return 0; | |
1953 | ||
1954 | desc = (struct reiserfs_journal_desc *)d_bh->b_data; | |
1955 | if (get_desc_trans_len(desc) > 0 | |
1956 | && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) { | |
1957 | if (oldest_invalid_trans_id && *oldest_invalid_trans_id | |
1958 | && get_desc_trans_id(desc) > *oldest_invalid_trans_id) { | |
1959 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, | |
1960 | "journal-986: transaction " | |
1961 | "is valid returning because trans_id %d is greater than " | |
1962 | "oldest_invalid %lu", | |
1963 | get_desc_trans_id(desc), | |
1964 | *oldest_invalid_trans_id); | |
1965 | return 0; | |
1966 | } | |
1967 | if (newest_mount_id | |
1968 | && *newest_mount_id > get_desc_mount_id(desc)) { | |
1969 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, | |
1970 | "journal-1087: transaction " | |
1971 | "is valid returning because mount_id %d is less than " | |
1972 | "newest_mount_id %lu", | |
1973 | get_desc_mount_id(desc), | |
1974 | *newest_mount_id); | |
1975 | return -1; | |
1976 | } | |
1977 | if (get_desc_trans_len(desc) > SB_JOURNAL(p_s_sb)->j_trans_max) { | |
1978 | reiserfs_warning(p_s_sb, | |
1979 | "journal-2018: Bad transaction length %d encountered, ignoring transaction", | |
1980 | get_desc_trans_len(desc)); | |
1981 | return -1; | |
1982 | } | |
1983 | offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb); | |
1984 | ||
1985 | /* ok, we have a journal description block, lets see if the transaction was valid */ | |
1986 | c_bh = | |
1987 | journal_bread(p_s_sb, | |
1988 | SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + | |
1989 | ((offset + get_desc_trans_len(desc) + | |
1990 | 1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb))); | |
1991 | if (!c_bh) | |
1992 | return 0; | |
1993 | commit = (struct reiserfs_journal_commit *)c_bh->b_data; | |
1994 | if (journal_compare_desc_commit(p_s_sb, desc, commit)) { | |
1995 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, | |
1996 | "journal_transaction_is_valid, commit offset %ld had bad " | |
1997 | "time %d or length %d", | |
1998 | c_bh->b_blocknr - | |
1999 | SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb), | |
2000 | get_commit_trans_id(commit), | |
2001 | get_commit_trans_len(commit)); | |
2002 | brelse(c_bh); | |
2003 | if (oldest_invalid_trans_id) { | |
2004 | *oldest_invalid_trans_id = | |
2005 | get_desc_trans_id(desc); | |
2006 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, | |
2007 | "journal-1004: " | |
2008 | "transaction_is_valid setting oldest invalid trans_id " | |
2009 | "to %d", | |
2010 | get_desc_trans_id(desc)); | |
2011 | } | |
2012 | return -1; | |
2013 | } | |
2014 | brelse(c_bh); | |
2015 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, | |
2016 | "journal-1006: found valid " | |
2017 | "transaction start offset %llu, len %d id %d", | |
2018 | d_bh->b_blocknr - | |
2019 | SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb), | |
2020 | get_desc_trans_len(desc), | |
2021 | get_desc_trans_id(desc)); | |
2022 | return 1; | |
2023 | } else { | |
2024 | return 0; | |
2025 | } | |
2026 | } | |
2027 | ||
2028 | static void brelse_array(struct buffer_head **heads, int num) | |
2029 | { | |
2030 | int i; | |
2031 | for (i = 0; i < num; i++) { | |
2032 | brelse(heads[i]); | |
2033 | } | |
1da177e4 LT |
2034 | } |
2035 | ||
2036 | /* | |
2037 | ** given the start, and values for the oldest acceptable transactions, | |
2038 | ** this either reads in a replays a transaction, or returns because the transaction | |
2039 | ** is invalid, or too old. | |
2040 | */ | |
bd4c625c LT |
2041 | static int journal_read_transaction(struct super_block *p_s_sb, |
2042 | unsigned long cur_dblock, | |
2043 | unsigned long oldest_start, | |
2044 | unsigned long oldest_trans_id, | |
2045 | unsigned long newest_mount_id) | |
2046 | { | |
2047 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
2048 | struct reiserfs_journal_desc *desc; | |
2049 | struct reiserfs_journal_commit *commit; | |
2050 | unsigned long trans_id = 0; | |
2051 | struct buffer_head *c_bh; | |
2052 | struct buffer_head *d_bh; | |
2053 | struct buffer_head **log_blocks = NULL; | |
2054 | struct buffer_head **real_blocks = NULL; | |
2055 | unsigned long trans_offset; | |
2056 | int i; | |
2057 | int trans_half; | |
2058 | ||
2059 | d_bh = journal_bread(p_s_sb, cur_dblock); | |
2060 | if (!d_bh) | |
2061 | return 1; | |
2062 | desc = (struct reiserfs_journal_desc *)d_bh->b_data; | |
2063 | trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb); | |
2064 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1037: " | |
2065 | "journal_read_transaction, offset %llu, len %d mount_id %d", | |
2066 | d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb), | |
2067 | get_desc_trans_len(desc), get_desc_mount_id(desc)); | |
2068 | if (get_desc_trans_id(desc) < oldest_trans_id) { | |
2069 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1039: " | |
2070 | "journal_read_trans skipping because %lu is too old", | |
2071 | cur_dblock - | |
2072 | SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb)); | |
2073 | brelse(d_bh); | |
2074 | return 1; | |
2075 | } | |
2076 | if (get_desc_mount_id(desc) != newest_mount_id) { | |
2077 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1146: " | |
2078 | "journal_read_trans skipping because %d is != " | |
2079 | "newest_mount_id %lu", get_desc_mount_id(desc), | |
2080 | newest_mount_id); | |
2081 | brelse(d_bh); | |
2082 | return 1; | |
2083 | } | |
2084 | c_bh = journal_bread(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + | |
2085 | ((trans_offset + get_desc_trans_len(desc) + 1) % | |
2086 | SB_ONDISK_JOURNAL_SIZE(p_s_sb))); | |
2087 | if (!c_bh) { | |
2088 | brelse(d_bh); | |
2089 | return 1; | |
2090 | } | |
2091 | commit = (struct reiserfs_journal_commit *)c_bh->b_data; | |
2092 | if (journal_compare_desc_commit(p_s_sb, desc, commit)) { | |
2093 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, | |
2094 | "journal_read_transaction, " | |
2095 | "commit offset %llu had bad time %d or length %d", | |
2096 | c_bh->b_blocknr - | |
2097 | SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb), | |
2098 | get_commit_trans_id(commit), | |
2099 | get_commit_trans_len(commit)); | |
2100 | brelse(c_bh); | |
2101 | brelse(d_bh); | |
2102 | return 1; | |
2103 | } | |
2104 | trans_id = get_desc_trans_id(desc); | |
2105 | /* now we know we've got a good transaction, and it was inside the valid time ranges */ | |
d739b42b PE |
2106 | log_blocks = kmalloc(get_desc_trans_len(desc) * |
2107 | sizeof(struct buffer_head *), GFP_NOFS); | |
2108 | real_blocks = kmalloc(get_desc_trans_len(desc) * | |
2109 | sizeof(struct buffer_head *), GFP_NOFS); | |
bd4c625c LT |
2110 | if (!log_blocks || !real_blocks) { |
2111 | brelse(c_bh); | |
2112 | brelse(d_bh); | |
d739b42b PE |
2113 | kfree(log_blocks); |
2114 | kfree(real_blocks); | |
bd4c625c LT |
2115 | reiserfs_warning(p_s_sb, |
2116 | "journal-1169: kmalloc failed, unable to mount FS"); | |
2117 | return -1; | |
2118 | } | |
2119 | /* get all the buffer heads */ | |
2120 | trans_half = journal_trans_half(p_s_sb->s_blocksize); | |
2121 | for (i = 0; i < get_desc_trans_len(desc); i++) { | |
2122 | log_blocks[i] = | |
2123 | journal_getblk(p_s_sb, | |
2124 | SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + | |
2125 | (trans_offset + 1 + | |
2126 | i) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)); | |
2127 | if (i < trans_half) { | |
2128 | real_blocks[i] = | |
2129 | sb_getblk(p_s_sb, | |
2130 | le32_to_cpu(desc->j_realblock[i])); | |
2131 | } else { | |
2132 | real_blocks[i] = | |
2133 | sb_getblk(p_s_sb, | |
2134 | le32_to_cpu(commit-> | |
2135 | j_realblock[i - trans_half])); | |
2136 | } | |
2137 | if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(p_s_sb)) { | |
2138 | reiserfs_warning(p_s_sb, | |
2139 | "journal-1207: REPLAY FAILURE fsck required! Block to replay is outside of filesystem"); | |
2140 | goto abort_replay; | |
2141 | } | |
2142 | /* make sure we don't try to replay onto log or reserved area */ | |
2143 | if (is_block_in_log_or_reserved_area | |
2144 | (p_s_sb, real_blocks[i]->b_blocknr)) { | |
2145 | reiserfs_warning(p_s_sb, | |
2146 | "journal-1204: REPLAY FAILURE fsck required! Trying to replay onto a log block"); | |
2147 | abort_replay: | |
2148 | brelse_array(log_blocks, i); | |
2149 | brelse_array(real_blocks, i); | |
2150 | brelse(c_bh); | |
2151 | brelse(d_bh); | |
d739b42b PE |
2152 | kfree(log_blocks); |
2153 | kfree(real_blocks); | |
bd4c625c LT |
2154 | return -1; |
2155 | } | |
2156 | } | |
2157 | /* read in the log blocks, memcpy to the corresponding real block */ | |
2158 | ll_rw_block(READ, get_desc_trans_len(desc), log_blocks); | |
2159 | for (i = 0; i < get_desc_trans_len(desc); i++) { | |
2160 | wait_on_buffer(log_blocks[i]); | |
2161 | if (!buffer_uptodate(log_blocks[i])) { | |
2162 | reiserfs_warning(p_s_sb, | |
2163 | "journal-1212: REPLAY FAILURE fsck required! buffer write failed"); | |
2164 | brelse_array(log_blocks + i, | |
2165 | get_desc_trans_len(desc) - i); | |
2166 | brelse_array(real_blocks, get_desc_trans_len(desc)); | |
2167 | brelse(c_bh); | |
2168 | brelse(d_bh); | |
d739b42b PE |
2169 | kfree(log_blocks); |
2170 | kfree(real_blocks); | |
bd4c625c LT |
2171 | return -1; |
2172 | } | |
2173 | memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data, | |
2174 | real_blocks[i]->b_size); | |
2175 | set_buffer_uptodate(real_blocks[i]); | |
2176 | brelse(log_blocks[i]); | |
2177 | } | |
2178 | /* flush out the real blocks */ | |
2179 | for (i = 0; i < get_desc_trans_len(desc); i++) { | |
2180 | set_buffer_dirty(real_blocks[i]); | |
53778ffd | 2181 | ll_rw_block(SWRITE, 1, real_blocks + i); |
bd4c625c LT |
2182 | } |
2183 | for (i = 0; i < get_desc_trans_len(desc); i++) { | |
2184 | wait_on_buffer(real_blocks[i]); | |
2185 | if (!buffer_uptodate(real_blocks[i])) { | |
2186 | reiserfs_warning(p_s_sb, | |
2187 | "journal-1226: REPLAY FAILURE, fsck required! buffer write failed"); | |
2188 | brelse_array(real_blocks + i, | |
2189 | get_desc_trans_len(desc) - i); | |
2190 | brelse(c_bh); | |
2191 | brelse(d_bh); | |
d739b42b PE |
2192 | kfree(log_blocks); |
2193 | kfree(real_blocks); | |
bd4c625c LT |
2194 | return -1; |
2195 | } | |
2196 | brelse(real_blocks[i]); | |
2197 | } | |
2198 | cur_dblock = | |
2199 | SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + | |
2200 | ((trans_offset + get_desc_trans_len(desc) + | |
2201 | 2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)); | |
2202 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, | |
2203 | "journal-1095: setting journal " "start to offset %ld", | |
2204 | cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb)); | |
2205 | ||
2206 | /* init starting values for the first transaction, in case this is the last transaction to be replayed. */ | |
2207 | journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb); | |
2208 | journal->j_last_flush_trans_id = trans_id; | |
2209 | journal->j_trans_id = trans_id + 1; | |
2210 | brelse(c_bh); | |
2211 | brelse(d_bh); | |
d739b42b PE |
2212 | kfree(log_blocks); |
2213 | kfree(real_blocks); | |
bd4c625c | 2214 | return 0; |
1da177e4 LT |
2215 | } |
2216 | ||
2217 | /* This function reads blocks starting from block and to max_block of bufsize | |
2218 | size (but no more than BUFNR blocks at a time). This proved to improve | |
2219 | mounting speed on self-rebuilding raid5 arrays at least. | |
2220 | Right now it is only used from journal code. But later we might use it | |
2221 | from other places. | |
2222 | Note: Do not use journal_getblk/sb_getblk functions here! */ | |
bd4c625c LT |
2223 | static struct buffer_head *reiserfs_breada(struct block_device *dev, int block, |
2224 | int bufsize, unsigned int max_block) | |
1da177e4 | 2225 | { |
bd4c625c | 2226 | struct buffer_head *bhlist[BUFNR]; |
1da177e4 | 2227 | unsigned int blocks = BUFNR; |
bd4c625c | 2228 | struct buffer_head *bh; |
1da177e4 | 2229 | int i, j; |
bd4c625c LT |
2230 | |
2231 | bh = __getblk(dev, block, bufsize); | |
2232 | if (buffer_uptodate(bh)) | |
2233 | return (bh); | |
2234 | ||
1da177e4 LT |
2235 | if (block + BUFNR > max_block) { |
2236 | blocks = max_block - block; | |
2237 | } | |
2238 | bhlist[0] = bh; | |
2239 | j = 1; | |
2240 | for (i = 1; i < blocks; i++) { | |
bd4c625c LT |
2241 | bh = __getblk(dev, block + i, bufsize); |
2242 | if (buffer_uptodate(bh)) { | |
2243 | brelse(bh); | |
1da177e4 | 2244 | break; |
bd4c625c LT |
2245 | } else |
2246 | bhlist[j++] = bh; | |
1da177e4 | 2247 | } |
bd4c625c LT |
2248 | ll_rw_block(READ, j, bhlist); |
2249 | for (i = 1; i < j; i++) | |
2250 | brelse(bhlist[i]); | |
1da177e4 | 2251 | bh = bhlist[0]; |
bd4c625c LT |
2252 | wait_on_buffer(bh); |
2253 | if (buffer_uptodate(bh)) | |
1da177e4 | 2254 | return bh; |
bd4c625c | 2255 | brelse(bh); |
1da177e4 LT |
2256 | return NULL; |
2257 | } | |
2258 | ||
2259 | /* | |
2260 | ** read and replay the log | |
2261 | ** on a clean unmount, the journal header's next unflushed pointer will be to an invalid | |
2262 | ** transaction. This tests that before finding all the transactions in the log, which makes normal mount times fast. | |
2263 | ** | |
2264 | ** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid. | |
2265 | ** | |
2266 | ** On exit, it sets things up so the first transaction will work correctly. | |
2267 | */ | |
bd4c625c LT |
2268 | static int journal_read(struct super_block *p_s_sb) |
2269 | { | |
2270 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
2271 | struct reiserfs_journal_desc *desc; | |
2272 | unsigned long oldest_trans_id = 0; | |
2273 | unsigned long oldest_invalid_trans_id = 0; | |
2274 | time_t start; | |
2275 | unsigned long oldest_start = 0; | |
2276 | unsigned long cur_dblock = 0; | |
2277 | unsigned long newest_mount_id = 9; | |
2278 | struct buffer_head *d_bh; | |
2279 | struct reiserfs_journal_header *jh; | |
2280 | int valid_journal_header = 0; | |
2281 | int replay_count = 0; | |
2282 | int continue_replay = 1; | |
2283 | int ret; | |
2284 | char b[BDEVNAME_SIZE]; | |
2285 | ||
2286 | cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb); | |
2287 | reiserfs_info(p_s_sb, "checking transaction log (%s)\n", | |
2288 | bdevname(journal->j_dev_bd, b)); | |
2289 | start = get_seconds(); | |
2290 | ||
2291 | /* step 1, read in the journal header block. Check the transaction it says | |
2292 | ** is the first unflushed, and if that transaction is not valid, | |
2293 | ** replay is done | |
2294 | */ | |
2295 | journal->j_header_bh = journal_bread(p_s_sb, | |
2296 | SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) | |
2297 | + SB_ONDISK_JOURNAL_SIZE(p_s_sb)); | |
2298 | if (!journal->j_header_bh) { | |
2299 | return 1; | |
2300 | } | |
2301 | jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data); | |
2302 | if (le32_to_cpu(jh->j_first_unflushed_offset) >= 0 && | |
2303 | le32_to_cpu(jh->j_first_unflushed_offset) < | |
2304 | SB_ONDISK_JOURNAL_SIZE(p_s_sb) | |
2305 | && le32_to_cpu(jh->j_last_flush_trans_id) > 0) { | |
2306 | oldest_start = | |
2307 | SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + | |
2308 | le32_to_cpu(jh->j_first_unflushed_offset); | |
2309 | oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1; | |
2310 | newest_mount_id = le32_to_cpu(jh->j_mount_id); | |
2311 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, | |
2312 | "journal-1153: found in " | |
2313 | "header: first_unflushed_offset %d, last_flushed_trans_id " | |
2314 | "%lu", le32_to_cpu(jh->j_first_unflushed_offset), | |
2315 | le32_to_cpu(jh->j_last_flush_trans_id)); | |
2316 | valid_journal_header = 1; | |
2317 | ||
2318 | /* now, we try to read the first unflushed offset. If it is not valid, | |
2319 | ** there is nothing more we can do, and it makes no sense to read | |
2320 | ** through the whole log. | |
2321 | */ | |
2322 | d_bh = | |
2323 | journal_bread(p_s_sb, | |
2324 | SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + | |
2325 | le32_to_cpu(jh->j_first_unflushed_offset)); | |
2326 | ret = journal_transaction_is_valid(p_s_sb, d_bh, NULL, NULL); | |
2327 | if (!ret) { | |
2328 | continue_replay = 0; | |
2329 | } | |
2330 | brelse(d_bh); | |
2331 | goto start_log_replay; | |
2332 | } | |
2333 | ||
2334 | if (continue_replay && bdev_read_only(p_s_sb->s_bdev)) { | |
2335 | reiserfs_warning(p_s_sb, | |
2336 | "clm-2076: device is readonly, unable to replay log"); | |
2337 | return -1; | |
2338 | } | |
2339 | ||
2340 | /* ok, there are transactions that need to be replayed. start with the first log block, find | |
2341 | ** all the valid transactions, and pick out the oldest. | |
2342 | */ | |
2343 | while (continue_replay | |
2344 | && cur_dblock < | |
2345 | (SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + | |
2346 | SB_ONDISK_JOURNAL_SIZE(p_s_sb))) { | |
2347 | /* Note that it is required for blocksize of primary fs device and journal | |
2348 | device to be the same */ | |
2349 | d_bh = | |
2350 | reiserfs_breada(journal->j_dev_bd, cur_dblock, | |
2351 | p_s_sb->s_blocksize, | |
2352 | SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + | |
2353 | SB_ONDISK_JOURNAL_SIZE(p_s_sb)); | |
2354 | ret = | |
2355 | journal_transaction_is_valid(p_s_sb, d_bh, | |
2356 | &oldest_invalid_trans_id, | |
2357 | &newest_mount_id); | |
2358 | if (ret == 1) { | |
2359 | desc = (struct reiserfs_journal_desc *)d_bh->b_data; | |
2360 | if (oldest_start == 0) { /* init all oldest_ values */ | |
2361 | oldest_trans_id = get_desc_trans_id(desc); | |
2362 | oldest_start = d_bh->b_blocknr; | |
2363 | newest_mount_id = get_desc_mount_id(desc); | |
2364 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, | |
2365 | "journal-1179: Setting " | |
2366 | "oldest_start to offset %llu, trans_id %lu", | |
2367 | oldest_start - | |
2368 | SB_ONDISK_JOURNAL_1st_BLOCK | |
2369 | (p_s_sb), oldest_trans_id); | |
2370 | } else if (oldest_trans_id > get_desc_trans_id(desc)) { | |
2371 | /* one we just read was older */ | |
2372 | oldest_trans_id = get_desc_trans_id(desc); | |
2373 | oldest_start = d_bh->b_blocknr; | |
2374 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, | |
2375 | "journal-1180: Resetting " | |
2376 | "oldest_start to offset %lu, trans_id %lu", | |
2377 | oldest_start - | |
2378 | SB_ONDISK_JOURNAL_1st_BLOCK | |
2379 | (p_s_sb), oldest_trans_id); | |
2380 | } | |
2381 | if (newest_mount_id < get_desc_mount_id(desc)) { | |
2382 | newest_mount_id = get_desc_mount_id(desc); | |
2383 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, | |
2384 | "journal-1299: Setting " | |
2385 | "newest_mount_id to %d", | |
2386 | get_desc_mount_id(desc)); | |
2387 | } | |
2388 | cur_dblock += get_desc_trans_len(desc) + 2; | |
2389 | } else { | |
2390 | cur_dblock++; | |
2391 | } | |
2392 | brelse(d_bh); | |
2393 | } | |
2394 | ||
2395 | start_log_replay: | |
2396 | cur_dblock = oldest_start; | |
2397 | if (oldest_trans_id) { | |
2398 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, | |
2399 | "journal-1206: Starting replay " | |
2400 | "from offset %llu, trans_id %lu", | |
2401 | cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb), | |
2402 | oldest_trans_id); | |
2403 | ||
2404 | } | |
2405 | replay_count = 0; | |
2406 | while (continue_replay && oldest_trans_id > 0) { | |
2407 | ret = | |
2408 | journal_read_transaction(p_s_sb, cur_dblock, oldest_start, | |
2409 | oldest_trans_id, newest_mount_id); | |
2410 | if (ret < 0) { | |
2411 | return ret; | |
2412 | } else if (ret != 0) { | |
2413 | break; | |
2414 | } | |
2415 | cur_dblock = | |
2416 | SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + journal->j_start; | |
2417 | replay_count++; | |
2418 | if (cur_dblock == oldest_start) | |
2419 | break; | |
2420 | } | |
2421 | ||
2422 | if (oldest_trans_id == 0) { | |
2423 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, | |
2424 | "journal-1225: No valid " "transactions found"); | |
2425 | } | |
2426 | /* j_start does not get set correctly if we don't replay any transactions. | |
2427 | ** if we had a valid journal_header, set j_start to the first unflushed transaction value, | |
2428 | ** copy the trans_id from the header | |
2429 | */ | |
2430 | if (valid_journal_header && replay_count == 0) { | |
2431 | journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset); | |
2432 | journal->j_trans_id = | |
2433 | le32_to_cpu(jh->j_last_flush_trans_id) + 1; | |
2434 | journal->j_last_flush_trans_id = | |
2435 | le32_to_cpu(jh->j_last_flush_trans_id); | |
2436 | journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1; | |
2437 | } else { | |
2438 | journal->j_mount_id = newest_mount_id + 1; | |
2439 | } | |
1da177e4 | 2440 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1299: Setting " |
bd4c625c LT |
2441 | "newest_mount_id to %lu", journal->j_mount_id); |
2442 | journal->j_first_unflushed_offset = journal->j_start; | |
2443 | if (replay_count > 0) { | |
2444 | reiserfs_info(p_s_sb, | |
2445 | "replayed %d transactions in %lu seconds\n", | |
2446 | replay_count, get_seconds() - start); | |
2447 | } | |
2448 | if (!bdev_read_only(p_s_sb->s_bdev) && | |
2449 | _update_journal_header_block(p_s_sb, journal->j_start, | |
2450 | journal->j_last_flush_trans_id)) { | |
2451 | /* replay failed, caller must call free_journal_ram and abort | |
2452 | ** the mount | |
2453 | */ | |
2454 | return -1; | |
2455 | } | |
2456 | return 0; | |
1da177e4 LT |
2457 | } |
2458 | ||
2459 | static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s) | |
2460 | { | |
bd4c625c | 2461 | struct reiserfs_journal_list *jl; |
8c777cc4 PE |
2462 | jl = kzalloc(sizeof(struct reiserfs_journal_list), |
2463 | GFP_NOFS | __GFP_NOFAIL); | |
bd4c625c LT |
2464 | INIT_LIST_HEAD(&jl->j_list); |
2465 | INIT_LIST_HEAD(&jl->j_working_list); | |
2466 | INIT_LIST_HEAD(&jl->j_tail_bh_list); | |
2467 | INIT_LIST_HEAD(&jl->j_bh_list); | |
2468 | sema_init(&jl->j_commit_lock, 1); | |
2469 | SB_JOURNAL(s)->j_num_lists++; | |
2470 | get_journal_list(jl); | |
2471 | return jl; | |
2472 | } | |
2473 | ||
2474 | static void journal_list_init(struct super_block *p_s_sb) | |
2475 | { | |
2476 | SB_JOURNAL(p_s_sb)->j_current_jl = alloc_journal_list(p_s_sb); | |
2477 | } | |
2478 | ||
2479 | static int release_journal_dev(struct super_block *super, | |
2480 | struct reiserfs_journal *journal) | |
2481 | { | |
2482 | int result; | |
2483 | ||
2484 | result = 0; | |
2485 | ||
2486 | if (journal->j_dev_file != NULL) { | |
2487 | result = filp_close(journal->j_dev_file, NULL); | |
2488 | journal->j_dev_file = NULL; | |
2489 | journal->j_dev_bd = NULL; | |
2490 | } else if (journal->j_dev_bd != NULL) { | |
2491 | result = blkdev_put(journal->j_dev_bd); | |
2492 | journal->j_dev_bd = NULL; | |
2493 | } | |
2494 | ||
2495 | if (result != 0) { | |
2496 | reiserfs_warning(super, | |
2497 | "sh-457: release_journal_dev: Cannot release journal device: %i", | |
2498 | result); | |
2499 | } | |
2500 | return result; | |
2501 | } | |
2502 | ||
2503 | static int journal_init_dev(struct super_block *super, | |
2504 | struct reiserfs_journal *journal, | |
2505 | const char *jdev_name) | |
1da177e4 LT |
2506 | { |
2507 | int result; | |
2508 | dev_t jdev; | |
2509 | int blkdev_mode = FMODE_READ | FMODE_WRITE; | |
2510 | char b[BDEVNAME_SIZE]; | |
2511 | ||
2512 | result = 0; | |
2513 | ||
bd4c625c LT |
2514 | journal->j_dev_bd = NULL; |
2515 | journal->j_dev_file = NULL; | |
2516 | jdev = SB_ONDISK_JOURNAL_DEVICE(super) ? | |
2517 | new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev; | |
1da177e4 LT |
2518 | |
2519 | if (bdev_read_only(super->s_bdev)) | |
bd4c625c | 2520 | blkdev_mode = FMODE_READ; |
1da177e4 LT |
2521 | |
2522 | /* there is no "jdev" option and journal is on separate device */ | |
bd4c625c | 2523 | if ((!jdev_name || !jdev_name[0])) { |
1da177e4 LT |
2524 | journal->j_dev_bd = open_by_devnum(jdev, blkdev_mode); |
2525 | if (IS_ERR(journal->j_dev_bd)) { | |
2526 | result = PTR_ERR(journal->j_dev_bd); | |
2527 | journal->j_dev_bd = NULL; | |
bd4c625c LT |
2528 | reiserfs_warning(super, "sh-458: journal_init_dev: " |
2529 | "cannot init journal device '%s': %i", | |
2530 | __bdevname(jdev, b), result); | |
1da177e4 LT |
2531 | return result; |
2532 | } else if (jdev != super->s_dev) | |
2533 | set_blocksize(journal->j_dev_bd, super->s_blocksize); | |
2534 | return 0; | |
2535 | } | |
2536 | ||
bd4c625c LT |
2537 | journal->j_dev_file = filp_open(jdev_name, 0, 0); |
2538 | if (!IS_ERR(journal->j_dev_file)) { | |
1da177e4 | 2539 | struct inode *jdev_inode = journal->j_dev_file->f_mapping->host; |
bd4c625c | 2540 | if (!S_ISBLK(jdev_inode->i_mode)) { |
74f9f974 | 2541 | reiserfs_warning(super, "journal_init_dev: '%s' is " |
bd4c625c | 2542 | "not a block device", jdev_name); |
1da177e4 | 2543 | result = -ENOTBLK; |
bd4c625c LT |
2544 | release_journal_dev(super, journal); |
2545 | } else { | |
1da177e4 LT |
2546 | /* ok */ |
2547 | journal->j_dev_bd = I_BDEV(jdev_inode); | |
2548 | set_blocksize(journal->j_dev_bd, super->s_blocksize); | |
bd4c625c LT |
2549 | reiserfs_info(super, |
2550 | "journal_init_dev: journal device: %s\n", | |
74f9f974 | 2551 | bdevname(journal->j_dev_bd, b)); |
1da177e4 LT |
2552 | } |
2553 | } else { | |
bd4c625c LT |
2554 | result = PTR_ERR(journal->j_dev_file); |
2555 | journal->j_dev_file = NULL; | |
2556 | reiserfs_warning(super, | |
2557 | "journal_init_dev: Cannot open '%s': %i", | |
2558 | jdev_name, result); | |
1da177e4 | 2559 | } |
1da177e4 LT |
2560 | return result; |
2561 | } | |
2562 | ||
2563 | /* | |
2564 | ** must be called once on fs mount. calls journal_read for you | |
2565 | */ | |
bd4c625c LT |
2566 | int journal_init(struct super_block *p_s_sb, const char *j_dev_name, |
2567 | int old_format, unsigned int commit_max_age) | |
2568 | { | |
2569 | int num_cnodes = SB_ONDISK_JOURNAL_SIZE(p_s_sb) * 2; | |
2570 | struct buffer_head *bhjh; | |
2571 | struct reiserfs_super_block *rs; | |
2572 | struct reiserfs_journal_header *jh; | |
2573 | struct reiserfs_journal *journal; | |
2574 | struct reiserfs_journal_list *jl; | |
2575 | char b[BDEVNAME_SIZE]; | |
2576 | ||
2577 | journal = SB_JOURNAL(p_s_sb) = vmalloc(sizeof(struct reiserfs_journal)); | |
2578 | if (!journal) { | |
2579 | reiserfs_warning(p_s_sb, | |
2580 | "journal-1256: unable to get memory for journal structure"); | |
2581 | return 1; | |
2582 | } | |
2583 | memset(journal, 0, sizeof(struct reiserfs_journal)); | |
2584 | INIT_LIST_HEAD(&journal->j_bitmap_nodes); | |
2585 | INIT_LIST_HEAD(&journal->j_prealloc_list); | |
2586 | INIT_LIST_HEAD(&journal->j_working_list); | |
2587 | INIT_LIST_HEAD(&journal->j_journal_list); | |
2588 | journal->j_persistent_trans = 0; | |
2589 | if (reiserfs_allocate_list_bitmaps(p_s_sb, | |
2590 | journal->j_list_bitmap, | |
2591 | SB_BMAP_NR(p_s_sb))) | |
2592 | goto free_and_return; | |
2593 | allocate_bitmap_nodes(p_s_sb); | |
2594 | ||
2595 | /* reserved for journal area support */ | |
2596 | SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) = (old_format ? | |
2597 | REISERFS_OLD_DISK_OFFSET_IN_BYTES | |
2598 | / p_s_sb->s_blocksize + | |
2599 | SB_BMAP_NR(p_s_sb) + | |
2600 | 1 : | |
2601 | REISERFS_DISK_OFFSET_IN_BYTES / | |
2602 | p_s_sb->s_blocksize + 2); | |
2603 | ||
2604 | /* Sanity check to see is the standard journal fitting withing first bitmap | |
2605 | (actual for small blocksizes) */ | |
2606 | if (!SB_ONDISK_JOURNAL_DEVICE(p_s_sb) && | |
2607 | (SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) + | |
2608 | SB_ONDISK_JOURNAL_SIZE(p_s_sb) > p_s_sb->s_blocksize * 8)) { | |
2609 | reiserfs_warning(p_s_sb, | |
2610 | "journal-1393: journal does not fit for area " | |
2611 | "addressed by first of bitmap blocks. It starts at " | |
2612 | "%u and its size is %u. Block size %ld", | |
2613 | SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb), | |
2614 | SB_ONDISK_JOURNAL_SIZE(p_s_sb), | |
2615 | p_s_sb->s_blocksize); | |
2616 | goto free_and_return; | |
2617 | } | |
2618 | ||
2619 | if (journal_init_dev(p_s_sb, journal, j_dev_name) != 0) { | |
2620 | reiserfs_warning(p_s_sb, | |
2621 | "sh-462: unable to initialize jornal device"); | |
2622 | goto free_and_return; | |
2623 | } | |
2624 | ||
2625 | rs = SB_DISK_SUPER_BLOCK(p_s_sb); | |
2626 | ||
2627 | /* read journal header */ | |
2628 | bhjh = journal_bread(p_s_sb, | |
2629 | SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + | |
2630 | SB_ONDISK_JOURNAL_SIZE(p_s_sb)); | |
2631 | if (!bhjh) { | |
2632 | reiserfs_warning(p_s_sb, | |
2633 | "sh-459: unable to read journal header"); | |
2634 | goto free_and_return; | |
2635 | } | |
2636 | jh = (struct reiserfs_journal_header *)(bhjh->b_data); | |
2637 | ||
2638 | /* make sure that journal matches to the super block */ | |
2639 | if (is_reiserfs_jr(rs) | |
2640 | && (le32_to_cpu(jh->jh_journal.jp_journal_magic) != | |
2641 | sb_jp_journal_magic(rs))) { | |
2642 | reiserfs_warning(p_s_sb, | |
2643 | "sh-460: journal header magic %x " | |
2644 | "(device %s) does not match to magic found in super " | |
2645 | "block %x", jh->jh_journal.jp_journal_magic, | |
2646 | bdevname(journal->j_dev_bd, b), | |
2647 | sb_jp_journal_magic(rs)); | |
2648 | brelse(bhjh); | |
2649 | goto free_and_return; | |
2650 | } | |
2651 | ||
2652 | journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max); | |
2653 | journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch); | |
2654 | journal->j_max_commit_age = | |
2655 | le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age); | |
2656 | journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE; | |
2657 | ||
2658 | if (journal->j_trans_max) { | |
2659 | /* make sure these parameters are available, assign it if they are not */ | |
2660 | __u32 initial = journal->j_trans_max; | |
2661 | __u32 ratio = 1; | |
2662 | ||
2663 | if (p_s_sb->s_blocksize < 4096) | |
2664 | ratio = 4096 / p_s_sb->s_blocksize; | |
2665 | ||
2666 | if (SB_ONDISK_JOURNAL_SIZE(p_s_sb) / journal->j_trans_max < | |
2667 | JOURNAL_MIN_RATIO) | |
2668 | journal->j_trans_max = | |
2669 | SB_ONDISK_JOURNAL_SIZE(p_s_sb) / JOURNAL_MIN_RATIO; | |
2670 | if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio) | |
2671 | journal->j_trans_max = | |
2672 | JOURNAL_TRANS_MAX_DEFAULT / ratio; | |
2673 | if (journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio) | |
2674 | journal->j_trans_max = | |
2675 | JOURNAL_TRANS_MIN_DEFAULT / ratio; | |
2676 | ||
2677 | if (journal->j_trans_max != initial) | |
2678 | reiserfs_warning(p_s_sb, | |
2679 | "sh-461: journal_init: wrong transaction max size (%u). Changed to %u", | |
2680 | initial, journal->j_trans_max); | |
2681 | ||
2682 | journal->j_max_batch = journal->j_trans_max * | |
2683 | JOURNAL_MAX_BATCH_DEFAULT / JOURNAL_TRANS_MAX_DEFAULT; | |
2684 | } | |
2685 | ||
2686 | if (!journal->j_trans_max) { | |
2687 | /*we have the file system was created by old version of mkreiserfs | |
2688 | so this field contains zero value */ | |
2689 | journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT; | |
2690 | journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT; | |
2691 | journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE; | |
2692 | ||
2693 | /* for blocksize >= 4096 - max transaction size is 1024. For block size < 4096 | |
2694 | trans max size is decreased proportionally */ | |
2695 | if (p_s_sb->s_blocksize < 4096) { | |
2696 | journal->j_trans_max /= (4096 / p_s_sb->s_blocksize); | |
2697 | journal->j_max_batch = (journal->j_trans_max) * 9 / 10; | |
2698 | } | |
2699 | } | |
2700 | ||
2701 | journal->j_default_max_commit_age = journal->j_max_commit_age; | |
2702 | ||
2703 | if (commit_max_age != 0) { | |
2704 | journal->j_max_commit_age = commit_max_age; | |
2705 | journal->j_max_trans_age = commit_max_age; | |
2706 | } | |
2707 | ||
2708 | reiserfs_info(p_s_sb, "journal params: device %s, size %u, " | |
2709 | "journal first block %u, max trans len %u, max batch %u, " | |
2710 | "max commit age %u, max trans age %u\n", | |
2711 | bdevname(journal->j_dev_bd, b), | |
2712 | SB_ONDISK_JOURNAL_SIZE(p_s_sb), | |
2713 | SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb), | |
2714 | journal->j_trans_max, | |
2715 | journal->j_max_batch, | |
2716 | journal->j_max_commit_age, journal->j_max_trans_age); | |
2717 | ||
2718 | brelse(bhjh); | |
2719 | ||
2720 | journal->j_list_bitmap_index = 0; | |
2721 | journal_list_init(p_s_sb); | |
2722 | ||
2723 | memset(journal->j_list_hash_table, 0, | |
2724 | JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)); | |
2725 | ||
2726 | INIT_LIST_HEAD(&journal->j_dirty_buffers); | |
2727 | spin_lock_init(&journal->j_dirty_buffers_lock); | |
2728 | ||
2729 | journal->j_start = 0; | |
2730 | journal->j_len = 0; | |
2731 | journal->j_len_alloc = 0; | |
2732 | atomic_set(&(journal->j_wcount), 0); | |
2733 | atomic_set(&(journal->j_async_throttle), 0); | |
2734 | journal->j_bcount = 0; | |
2735 | journal->j_trans_start_time = 0; | |
2736 | journal->j_last = NULL; | |
2737 | journal->j_first = NULL; | |
2738 | init_waitqueue_head(&(journal->j_join_wait)); | |
2739 | sema_init(&journal->j_lock, 1); | |
2740 | sema_init(&journal->j_flush_sem, 1); | |
2741 | ||
2742 | journal->j_trans_id = 10; | |
2743 | journal->j_mount_id = 10; | |
2744 | journal->j_state = 0; | |
2745 | atomic_set(&(journal->j_jlock), 0); | |
2746 | journal->j_cnode_free_list = allocate_cnodes(num_cnodes); | |
2747 | journal->j_cnode_free_orig = journal->j_cnode_free_list; | |
2748 | journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0; | |
2749 | journal->j_cnode_used = 0; | |
2750 | journal->j_must_wait = 0; | |
2751 | ||
576f6d79 JM |
2752 | if (journal->j_cnode_free == 0) { |
2753 | reiserfs_warning(p_s_sb, "journal-2004: Journal cnode memory " | |
2754 | "allocation failed (%ld bytes). Journal is " | |
2755 | "too large for available memory. Usually " | |
2756 | "this is due to a journal that is too large.", | |
2757 | sizeof (struct reiserfs_journal_cnode) * num_cnodes); | |
2758 | goto free_and_return; | |
2759 | } | |
2760 | ||
bd4c625c LT |
2761 | init_journal_hash(p_s_sb); |
2762 | jl = journal->j_current_jl; | |
2763 | jl->j_list_bitmap = get_list_bitmap(p_s_sb, jl); | |
2764 | if (!jl->j_list_bitmap) { | |
2765 | reiserfs_warning(p_s_sb, | |
2766 | "journal-2005, get_list_bitmap failed for journal list 0"); | |
2767 | goto free_and_return; | |
2768 | } | |
2769 | if (journal_read(p_s_sb) < 0) { | |
2770 | reiserfs_warning(p_s_sb, "Replay Failure, unable to mount"); | |
2771 | goto free_and_return; | |
2772 | } | |
2773 | ||
2774 | reiserfs_mounted_fs_count++; | |
2775 | if (reiserfs_mounted_fs_count <= 1) | |
2776 | commit_wq = create_workqueue("reiserfs"); | |
2777 | ||
2778 | INIT_WORK(&journal->j_work, flush_async_commits, p_s_sb); | |
2779 | return 0; | |
2780 | free_and_return: | |
2781 | free_journal_ram(p_s_sb); | |
2782 | return 1; | |
1da177e4 LT |
2783 | } |
2784 | ||
2785 | /* | |
2786 | ** test for a polite end of the current transaction. Used by file_write, and should | |
2787 | ** be used by delete to make sure they don't write more than can fit inside a single | |
2788 | ** transaction | |
2789 | */ | |
bd4c625c LT |
2790 | int journal_transaction_should_end(struct reiserfs_transaction_handle *th, |
2791 | int new_alloc) | |
2792 | { | |
2793 | struct reiserfs_journal *journal = SB_JOURNAL(th->t_super); | |
2794 | time_t now = get_seconds(); | |
2795 | /* cannot restart while nested */ | |
2796 | BUG_ON(!th->t_trans_id); | |
2797 | if (th->t_refcount > 1) | |
2798 | return 0; | |
2799 | if (journal->j_must_wait > 0 || | |
2800 | (journal->j_len_alloc + new_alloc) >= journal->j_max_batch || | |
2801 | atomic_read(&(journal->j_jlock)) || | |
2802 | (now - journal->j_trans_start_time) > journal->j_max_trans_age || | |
2803 | journal->j_cnode_free < (journal->j_trans_max * 3)) { | |
2804 | return 1; | |
2805 | } | |
2806 | return 0; | |
1da177e4 LT |
2807 | } |
2808 | ||
2809 | /* this must be called inside a transaction, and requires the | |
2810 | ** kernel_lock to be held | |
2811 | */ | |
bd4c625c LT |
2812 | void reiserfs_block_writes(struct reiserfs_transaction_handle *th) |
2813 | { | |
2814 | struct reiserfs_journal *journal = SB_JOURNAL(th->t_super); | |
2815 | BUG_ON(!th->t_trans_id); | |
2816 | journal->j_must_wait = 1; | |
2817 | set_bit(J_WRITERS_BLOCKED, &journal->j_state); | |
2818 | return; | |
1da177e4 LT |
2819 | } |
2820 | ||
2821 | /* this must be called without a transaction started, and does not | |
2822 | ** require BKL | |
2823 | */ | |
bd4c625c LT |
2824 | void reiserfs_allow_writes(struct super_block *s) |
2825 | { | |
2826 | struct reiserfs_journal *journal = SB_JOURNAL(s); | |
2827 | clear_bit(J_WRITERS_BLOCKED, &journal->j_state); | |
2828 | wake_up(&journal->j_join_wait); | |
1da177e4 LT |
2829 | } |
2830 | ||
2831 | /* this must be called without a transaction started, and does not | |
2832 | ** require BKL | |
2833 | */ | |
bd4c625c LT |
2834 | void reiserfs_wait_on_write_block(struct super_block *s) |
2835 | { | |
2836 | struct reiserfs_journal *journal = SB_JOURNAL(s); | |
2837 | wait_event(journal->j_join_wait, | |
2838 | !test_bit(J_WRITERS_BLOCKED, &journal->j_state)); | |
2839 | } | |
2840 | ||
2841 | static void queue_log_writer(struct super_block *s) | |
2842 | { | |
2843 | wait_queue_t wait; | |
2844 | struct reiserfs_journal *journal = SB_JOURNAL(s); | |
2845 | set_bit(J_WRITERS_QUEUED, &journal->j_state); | |
2846 | ||
2847 | /* | |
2848 | * we don't want to use wait_event here because | |
2849 | * we only want to wait once. | |
2850 | */ | |
2851 | init_waitqueue_entry(&wait, current); | |
2852 | add_wait_queue(&journal->j_join_wait, &wait); | |
1da177e4 | 2853 | set_current_state(TASK_UNINTERRUPTIBLE); |
bd4c625c LT |
2854 | if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) |
2855 | schedule(); | |
2856 | current->state = TASK_RUNNING; | |
2857 | remove_wait_queue(&journal->j_join_wait, &wait); | |
2858 | } | |
2859 | ||
2860 | static void wake_queued_writers(struct super_block *s) | |
2861 | { | |
2862 | struct reiserfs_journal *journal = SB_JOURNAL(s); | |
2863 | if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state)) | |
2864 | wake_up(&journal->j_join_wait); | |
2865 | } | |
2866 | ||
2867 | static void let_transaction_grow(struct super_block *sb, unsigned long trans_id) | |
2868 | { | |
2869 | struct reiserfs_journal *journal = SB_JOURNAL(sb); | |
2870 | unsigned long bcount = journal->j_bcount; | |
2871 | while (1) { | |
041e0e3b | 2872 | schedule_timeout_uninterruptible(1); |
bd4c625c LT |
2873 | journal->j_current_jl->j_state |= LIST_COMMIT_PENDING; |
2874 | while ((atomic_read(&journal->j_wcount) > 0 || | |
2875 | atomic_read(&journal->j_jlock)) && | |
2876 | journal->j_trans_id == trans_id) { | |
2877 | queue_log_writer(sb); | |
2878 | } | |
2879 | if (journal->j_trans_id != trans_id) | |
2880 | break; | |
2881 | if (bcount == journal->j_bcount) | |
2882 | break; | |
2883 | bcount = journal->j_bcount; | |
1da177e4 | 2884 | } |
1da177e4 LT |
2885 | } |
2886 | ||
2887 | /* join == true if you must join an existing transaction. | |
2888 | ** join == false if you can deal with waiting for others to finish | |
2889 | ** | |
2890 | ** this will block until the transaction is joinable. send the number of blocks you | |
2891 | ** expect to use in nblocks. | |
2892 | */ | |
bd4c625c LT |
2893 | static int do_journal_begin_r(struct reiserfs_transaction_handle *th, |
2894 | struct super_block *p_s_sb, unsigned long nblocks, | |
2895 | int join) | |
2896 | { | |
2897 | time_t now = get_seconds(); | |
2898 | int old_trans_id; | |
2899 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
2900 | struct reiserfs_transaction_handle myth; | |
2901 | int sched_count = 0; | |
2902 | int retval; | |
2903 | ||
2904 | reiserfs_check_lock_depth(p_s_sb, "journal_begin"); | |
2905 | if (nblocks > journal->j_trans_max) | |
2906 | BUG(); | |
2907 | ||
2908 | PROC_INFO_INC(p_s_sb, journal.journal_being); | |
2909 | /* set here for journal_join */ | |
2910 | th->t_refcount = 1; | |
2911 | th->t_super = p_s_sb; | |
2912 | ||
2913 | relock: | |
2914 | lock_journal(p_s_sb); | |
2915 | if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) { | |
2916 | unlock_journal(p_s_sb); | |
2917 | retval = journal->j_errno; | |
2918 | goto out_fail; | |
2919 | } | |
2920 | journal->j_bcount++; | |
2921 | ||
2922 | if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) { | |
2923 | unlock_journal(p_s_sb); | |
2924 | reiserfs_wait_on_write_block(p_s_sb); | |
2925 | PROC_INFO_INC(p_s_sb, journal.journal_relock_writers); | |
2926 | goto relock; | |
2927 | } | |
2928 | now = get_seconds(); | |
2929 | ||
2930 | /* if there is no room in the journal OR | |
2931 | ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning | |
2932 | ** we don't sleep if there aren't other writers | |
2933 | */ | |
2934 | ||
2935 | if ((!join && journal->j_must_wait > 0) || | |
2936 | (!join | |
2937 | && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch) | |
2938 | || (!join && atomic_read(&journal->j_wcount) > 0 | |
2939 | && journal->j_trans_start_time > 0 | |
2940 | && (now - journal->j_trans_start_time) > | |
2941 | journal->j_max_trans_age) || (!join | |
2942 | && atomic_read(&journal->j_jlock)) | |
2943 | || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) { | |
2944 | ||
2945 | old_trans_id = journal->j_trans_id; | |
2946 | unlock_journal(p_s_sb); /* allow others to finish this transaction */ | |
2947 | ||
2948 | if (!join && (journal->j_len_alloc + nblocks + 2) >= | |
2949 | journal->j_max_batch && | |
2950 | ((journal->j_len + nblocks + 2) * 100) < | |
2951 | (journal->j_len_alloc * 75)) { | |
2952 | if (atomic_read(&journal->j_wcount) > 10) { | |
2953 | sched_count++; | |
2954 | queue_log_writer(p_s_sb); | |
2955 | goto relock; | |
2956 | } | |
2957 | } | |
2958 | /* don't mess with joining the transaction if all we have to do is | |
2959 | * wait for someone else to do a commit | |
2960 | */ | |
2961 | if (atomic_read(&journal->j_jlock)) { | |
2962 | while (journal->j_trans_id == old_trans_id && | |
2963 | atomic_read(&journal->j_jlock)) { | |
2964 | queue_log_writer(p_s_sb); | |
2965 | } | |
2966 | goto relock; | |
2967 | } | |
2968 | retval = journal_join(&myth, p_s_sb, 1); | |
2969 | if (retval) | |
2970 | goto out_fail; | |
2971 | ||
2972 | /* someone might have ended the transaction while we joined */ | |
2973 | if (old_trans_id != journal->j_trans_id) { | |
2974 | retval = do_journal_end(&myth, p_s_sb, 1, 0); | |
2975 | } else { | |
2976 | retval = do_journal_end(&myth, p_s_sb, 1, COMMIT_NOW); | |
2977 | } | |
2978 | ||
2979 | if (retval) | |
2980 | goto out_fail; | |
2981 | ||
2982 | PROC_INFO_INC(p_s_sb, journal.journal_relock_wcount); | |
2983 | goto relock; | |
2984 | } | |
2985 | /* we are the first writer, set trans_id */ | |
2986 | if (journal->j_trans_start_time == 0) { | |
2987 | journal->j_trans_start_time = get_seconds(); | |
2988 | } | |
2989 | atomic_inc(&(journal->j_wcount)); | |
2990 | journal->j_len_alloc += nblocks; | |
2991 | th->t_blocks_logged = 0; | |
2992 | th->t_blocks_allocated = nblocks; | |
2993 | th->t_trans_id = journal->j_trans_id; | |
2994 | unlock_journal(p_s_sb); | |
2995 | INIT_LIST_HEAD(&th->t_list); | |
2996 | get_fs_excl(); | |
2997 | return 0; | |
2998 | ||
2999 | out_fail: | |
3000 | memset(th, 0, sizeof(*th)); | |
3001 | /* Re-set th->t_super, so we can properly keep track of how many | |
3002 | * persistent transactions there are. We need to do this so if this | |
3003 | * call is part of a failed restart_transaction, we can free it later */ | |
3004 | th->t_super = p_s_sb; | |
3005 | return retval; | |
3006 | } | |
3007 | ||
3008 | struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct | |
3009 | super_block | |
3010 | *s, | |
3011 | int nblocks) | |
3012 | { | |
3013 | int ret; | |
3014 | struct reiserfs_transaction_handle *th; | |
3015 | ||
3016 | /* if we're nesting into an existing transaction. It will be | |
3017 | ** persistent on its own | |
3018 | */ | |
3019 | if (reiserfs_transaction_running(s)) { | |
3020 | th = current->journal_info; | |
3021 | th->t_refcount++; | |
3022 | if (th->t_refcount < 2) { | |
3023 | BUG(); | |
3024 | } | |
3025 | return th; | |
3026 | } | |
d739b42b | 3027 | th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS); |
bd4c625c LT |
3028 | if (!th) |
3029 | return NULL; | |
3030 | ret = journal_begin(th, s, nblocks); | |
3031 | if (ret) { | |
d739b42b | 3032 | kfree(th); |
bd4c625c LT |
3033 | return NULL; |
3034 | } | |
3035 | ||
3036 | SB_JOURNAL(s)->j_persistent_trans++; | |
3037 | return th; | |
3038 | } | |
3039 | ||
3040 | int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th) | |
3041 | { | |
3042 | struct super_block *s = th->t_super; | |
3043 | int ret = 0; | |
3044 | if (th->t_trans_id) | |
3045 | ret = journal_end(th, th->t_super, th->t_blocks_allocated); | |
3046 | else | |
3047 | ret = -EIO; | |
3048 | if (th->t_refcount == 0) { | |
3049 | SB_JOURNAL(s)->j_persistent_trans--; | |
d739b42b | 3050 | kfree(th); |
bd4c625c LT |
3051 | } |
3052 | return ret; | |
3053 | } | |
3054 | ||
3055 | static int journal_join(struct reiserfs_transaction_handle *th, | |
3056 | struct super_block *p_s_sb, unsigned long nblocks) | |
3057 | { | |
3058 | struct reiserfs_transaction_handle *cur_th = current->journal_info; | |
3059 | ||
3060 | /* this keeps do_journal_end from NULLing out the current->journal_info | |
3061 | ** pointer | |
3062 | */ | |
3063 | th->t_handle_save = cur_th; | |
3064 | if (cur_th && cur_th->t_refcount > 1) { | |
3065 | BUG(); | |
3066 | } | |
3067 | return do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_JOIN); | |
3068 | } | |
3069 | ||
3070 | int journal_join_abort(struct reiserfs_transaction_handle *th, | |
3071 | struct super_block *p_s_sb, unsigned long nblocks) | |
3072 | { | |
3073 | struct reiserfs_transaction_handle *cur_th = current->journal_info; | |
3074 | ||
3075 | /* this keeps do_journal_end from NULLing out the current->journal_info | |
3076 | ** pointer | |
3077 | */ | |
3078 | th->t_handle_save = cur_th; | |
3079 | if (cur_th && cur_th->t_refcount > 1) { | |
3080 | BUG(); | |
3081 | } | |
3082 | return do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_ABORT); | |
3083 | } | |
3084 | ||
3085 | int journal_begin(struct reiserfs_transaction_handle *th, | |
3086 | struct super_block *p_s_sb, unsigned long nblocks) | |
3087 | { | |
3088 | struct reiserfs_transaction_handle *cur_th = current->journal_info; | |
3089 | int ret; | |
3090 | ||
3091 | th->t_handle_save = NULL; | |
3092 | if (cur_th) { | |
3093 | /* we are nesting into the current transaction */ | |
3094 | if (cur_th->t_super == p_s_sb) { | |
3095 | BUG_ON(!cur_th->t_refcount); | |
3096 | cur_th->t_refcount++; | |
3097 | memcpy(th, cur_th, sizeof(*th)); | |
3098 | if (th->t_refcount <= 1) | |
3099 | reiserfs_warning(p_s_sb, | |
3100 | "BAD: refcount <= 1, but journal_info != 0"); | |
3101 | return 0; | |
3102 | } else { | |
3103 | /* we've ended up with a handle from a different filesystem. | |
3104 | ** save it and restore on journal_end. This should never | |
3105 | ** really happen... | |
3106 | */ | |
3107 | reiserfs_warning(p_s_sb, | |
3108 | "clm-2100: nesting info a different FS"); | |
3109 | th->t_handle_save = current->journal_info; | |
3110 | current->journal_info = th; | |
3111 | } | |
1da177e4 | 3112 | } else { |
bd4c625c LT |
3113 | current->journal_info = th; |
3114 | } | |
3115 | ret = do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_REG); | |
3116 | if (current->journal_info != th) | |
3117 | BUG(); | |
1da177e4 | 3118 | |
bd4c625c LT |
3119 | /* I guess this boils down to being the reciprocal of clm-2100 above. |
3120 | * If do_journal_begin_r fails, we need to put it back, since journal_end | |
3121 | * won't be called to do it. */ | |
3122 | if (ret) | |
3123 | current->journal_info = th->t_handle_save; | |
3124 | else | |
3125 | BUG_ON(!th->t_refcount); | |
1da177e4 | 3126 | |
bd4c625c | 3127 | return ret; |
1da177e4 LT |
3128 | } |
3129 | ||
3130 | /* | |
3131 | ** puts bh into the current transaction. If it was already there, reorders removes the | |
3132 | ** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order). | |
3133 | ** | |
3134 | ** if it was dirty, cleans and files onto the clean list. I can't let it be dirty again until the | |
3135 | ** transaction is committed. | |
3136 | ** | |
3137 | ** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len. | |
3138 | */ | |
bd4c625c LT |
3139 | int journal_mark_dirty(struct reiserfs_transaction_handle *th, |
3140 | struct super_block *p_s_sb, struct buffer_head *bh) | |
3141 | { | |
3142 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
3143 | struct reiserfs_journal_cnode *cn = NULL; | |
3144 | int count_already_incd = 0; | |
3145 | int prepared = 0; | |
3146 | BUG_ON(!th->t_trans_id); | |
3147 | ||
3148 | PROC_INFO_INC(p_s_sb, journal.mark_dirty); | |
3149 | if (th->t_trans_id != journal->j_trans_id) { | |
3150 | reiserfs_panic(th->t_super, | |
3151 | "journal-1577: handle trans id %ld != current trans id %ld\n", | |
3152 | th->t_trans_id, journal->j_trans_id); | |
3153 | } | |
3154 | ||
3155 | p_s_sb->s_dirt = 1; | |
3156 | ||
3157 | prepared = test_clear_buffer_journal_prepared(bh); | |
3158 | clear_buffer_journal_restore_dirty(bh); | |
3159 | /* already in this transaction, we are done */ | |
3160 | if (buffer_journaled(bh)) { | |
3161 | PROC_INFO_INC(p_s_sb, journal.mark_dirty_already); | |
3162 | return 0; | |
3163 | } | |
3164 | ||
3165 | /* this must be turned into a panic instead of a warning. We can't allow | |
3166 | ** a dirty or journal_dirty or locked buffer to be logged, as some changes | |
3167 | ** could get to disk too early. NOT GOOD. | |
3168 | */ | |
3169 | if (!prepared || buffer_dirty(bh)) { | |
3170 | reiserfs_warning(p_s_sb, "journal-1777: buffer %llu bad state " | |
3171 | "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT", | |
3172 | (unsigned long long)bh->b_blocknr, | |
3173 | prepared ? ' ' : '!', | |
3174 | buffer_locked(bh) ? ' ' : '!', | |
3175 | buffer_dirty(bh) ? ' ' : '!', | |
3176 | buffer_journal_dirty(bh) ? ' ' : '!'); | |
3177 | } | |
3178 | ||
3179 | if (atomic_read(&(journal->j_wcount)) <= 0) { | |
3180 | reiserfs_warning(p_s_sb, | |
3181 | "journal-1409: journal_mark_dirty returning because j_wcount was %d", | |
3182 | atomic_read(&(journal->j_wcount))); | |
3183 | return 1; | |
3184 | } | |
3185 | /* this error means I've screwed up, and we've overflowed the transaction. | |
3186 | ** Nothing can be done here, except make the FS readonly or panic. | |
3187 | */ | |
3188 | if (journal->j_len >= journal->j_trans_max) { | |
3189 | reiserfs_panic(th->t_super, | |
3190 | "journal-1413: journal_mark_dirty: j_len (%lu) is too big\n", | |
3191 | journal->j_len); | |
3192 | } | |
3193 | ||
3194 | if (buffer_journal_dirty(bh)) { | |
3195 | count_already_incd = 1; | |
3196 | PROC_INFO_INC(p_s_sb, journal.mark_dirty_notjournal); | |
3197 | clear_buffer_journal_dirty(bh); | |
3198 | } | |
3199 | ||
3200 | if (journal->j_len > journal->j_len_alloc) { | |
3201 | journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT; | |
3202 | } | |
3203 | ||
3204 | set_buffer_journaled(bh); | |
3205 | ||
3206 | /* now put this guy on the end */ | |
3207 | if (!cn) { | |
3208 | cn = get_cnode(p_s_sb); | |
3209 | if (!cn) { | |
3210 | reiserfs_panic(p_s_sb, "get_cnode failed!\n"); | |
3211 | } | |
3212 | ||
3213 | if (th->t_blocks_logged == th->t_blocks_allocated) { | |
3214 | th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT; | |
3215 | journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT; | |
3216 | } | |
3217 | th->t_blocks_logged++; | |
3218 | journal->j_len++; | |
3219 | ||
3220 | cn->bh = bh; | |
3221 | cn->blocknr = bh->b_blocknr; | |
3222 | cn->sb = p_s_sb; | |
3223 | cn->jlist = NULL; | |
3224 | insert_journal_hash(journal->j_hash_table, cn); | |
3225 | if (!count_already_incd) { | |
3226 | get_bh(bh); | |
3227 | } | |
3228 | } | |
3229 | cn->next = NULL; | |
3230 | cn->prev = journal->j_last; | |
3231 | cn->bh = bh; | |
3232 | if (journal->j_last) { | |
3233 | journal->j_last->next = cn; | |
3234 | journal->j_last = cn; | |
3235 | } else { | |
3236 | journal->j_first = cn; | |
3237 | journal->j_last = cn; | |
3238 | } | |
3239 | return 0; | |
3240 | } | |
3241 | ||
3242 | int journal_end(struct reiserfs_transaction_handle *th, | |
3243 | struct super_block *p_s_sb, unsigned long nblocks) | |
3244 | { | |
3245 | if (!current->journal_info && th->t_refcount > 1) | |
3246 | reiserfs_warning(p_s_sb, "REISER-NESTING: th NULL, refcount %d", | |
3247 | th->t_refcount); | |
3248 | ||
3249 | if (!th->t_trans_id) { | |
3250 | WARN_ON(1); | |
3251 | return -EIO; | |
3252 | } | |
3253 | ||
3254 | th->t_refcount--; | |
3255 | if (th->t_refcount > 0) { | |
3256 | struct reiserfs_transaction_handle *cur_th = | |
3257 | current->journal_info; | |
3258 | ||
3259 | /* we aren't allowed to close a nested transaction on a different | |
3260 | ** filesystem from the one in the task struct | |
3261 | */ | |
3262 | if (cur_th->t_super != th->t_super) | |
3263 | BUG(); | |
3264 | ||
3265 | if (th != cur_th) { | |
3266 | memcpy(current->journal_info, th, sizeof(*th)); | |
3267 | th->t_trans_id = 0; | |
3268 | } | |
3269 | return 0; | |
3270 | } else { | |
3271 | return do_journal_end(th, p_s_sb, nblocks, 0); | |
3272 | } | |
1da177e4 LT |
3273 | } |
3274 | ||
3275 | /* removes from the current transaction, relsing and descrementing any counters. | |
3276 | ** also files the removed buffer directly onto the clean list | |
3277 | ** | |
3278 | ** called by journal_mark_freed when a block has been deleted | |
3279 | ** | |
3280 | ** returns 1 if it cleaned and relsed the buffer. 0 otherwise | |
3281 | */ | |
bd4c625c LT |
3282 | static int remove_from_transaction(struct super_block *p_s_sb, |
3283 | b_blocknr_t blocknr, int already_cleaned) | |
3284 | { | |
3285 | struct buffer_head *bh; | |
3286 | struct reiserfs_journal_cnode *cn; | |
3287 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
3288 | int ret = 0; | |
3289 | ||
3290 | cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, blocknr); | |
3291 | if (!cn || !cn->bh) { | |
3292 | return ret; | |
3293 | } | |
3294 | bh = cn->bh; | |
3295 | if (cn->prev) { | |
3296 | cn->prev->next = cn->next; | |
3297 | } | |
3298 | if (cn->next) { | |
3299 | cn->next->prev = cn->prev; | |
3300 | } | |
3301 | if (cn == journal->j_first) { | |
3302 | journal->j_first = cn->next; | |
3303 | } | |
3304 | if (cn == journal->j_last) { | |
3305 | journal->j_last = cn->prev; | |
3306 | } | |
3307 | if (bh) | |
3308 | remove_journal_hash(p_s_sb, journal->j_hash_table, NULL, | |
3309 | bh->b_blocknr, 0); | |
3310 | clear_buffer_journaled(bh); /* don't log this one */ | |
3311 | ||
3312 | if (!already_cleaned) { | |
3313 | clear_buffer_journal_dirty(bh); | |
3314 | clear_buffer_dirty(bh); | |
3315 | clear_buffer_journal_test(bh); | |
3316 | put_bh(bh); | |
3317 | if (atomic_read(&(bh->b_count)) < 0) { | |
3318 | reiserfs_warning(p_s_sb, | |
3319 | "journal-1752: remove from trans, b_count < 0"); | |
3320 | } | |
3321 | ret = 1; | |
3322 | } | |
3323 | journal->j_len--; | |
3324 | journal->j_len_alloc--; | |
3325 | free_cnode(p_s_sb, cn); | |
3326 | return ret; | |
1da177e4 LT |
3327 | } |
3328 | ||
3329 | /* | |
3330 | ** for any cnode in a journal list, it can only be dirtied of all the | |
3331 | ** transactions that include it are commited to disk. | |
3332 | ** this checks through each transaction, and returns 1 if you are allowed to dirty, | |
3333 | ** and 0 if you aren't | |
3334 | ** | |
3335 | ** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log | |
3336 | ** blocks for a given transaction on disk | |
3337 | ** | |
3338 | */ | |
bd4c625c LT |
3339 | static int can_dirty(struct reiserfs_journal_cnode *cn) |
3340 | { | |
3341 | struct super_block *sb = cn->sb; | |
3342 | b_blocknr_t blocknr = cn->blocknr; | |
3343 | struct reiserfs_journal_cnode *cur = cn->hprev; | |
3344 | int can_dirty = 1; | |
3345 | ||
3346 | /* first test hprev. These are all newer than cn, so any node here | |
3347 | ** with the same block number and dev means this node can't be sent | |
3348 | ** to disk right now. | |
3349 | */ | |
3350 | while (cur && can_dirty) { | |
3351 | if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb && | |
3352 | cur->blocknr == blocknr) { | |
3353 | can_dirty = 0; | |
3354 | } | |
3355 | cur = cur->hprev; | |
3356 | } | |
3357 | /* then test hnext. These are all older than cn. As long as they | |
3358 | ** are committed to the log, it is safe to write cn to disk | |
3359 | */ | |
3360 | cur = cn->hnext; | |
3361 | while (cur && can_dirty) { | |
3362 | if (cur->jlist && cur->jlist->j_len > 0 && | |
3363 | atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh && | |
3364 | cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) { | |
3365 | can_dirty = 0; | |
3366 | } | |
3367 | cur = cur->hnext; | |
3368 | } | |
3369 | return can_dirty; | |
1da177e4 LT |
3370 | } |
3371 | ||
3372 | /* syncs the commit blocks, but does not force the real buffers to disk | |
3373 | ** will wait until the current transaction is done/commited before returning | |
3374 | */ | |
bd4c625c LT |
3375 | int journal_end_sync(struct reiserfs_transaction_handle *th, |
3376 | struct super_block *p_s_sb, unsigned long nblocks) | |
3377 | { | |
3378 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
1da177e4 | 3379 | |
bd4c625c LT |
3380 | BUG_ON(!th->t_trans_id); |
3381 | /* you can sync while nested, very, very bad */ | |
3382 | if (th->t_refcount > 1) { | |
3383 | BUG(); | |
3384 | } | |
3385 | if (journal->j_len == 0) { | |
3386 | reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), | |
3387 | 1); | |
3388 | journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)); | |
3389 | } | |
3390 | return do_journal_end(th, p_s_sb, nblocks, COMMIT_NOW | WAIT); | |
1da177e4 LT |
3391 | } |
3392 | ||
3393 | /* | |
3394 | ** writeback the pending async commits to disk | |
3395 | */ | |
bd4c625c LT |
3396 | static void flush_async_commits(void *p) |
3397 | { | |
3398 | struct super_block *p_s_sb = p; | |
3399 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
3400 | struct reiserfs_journal_list *jl; | |
3401 | struct list_head *entry; | |
3402 | ||
3403 | lock_kernel(); | |
3404 | if (!list_empty(&journal->j_journal_list)) { | |
3405 | /* last entry is the youngest, commit it and you get everything */ | |
3406 | entry = journal->j_journal_list.prev; | |
3407 | jl = JOURNAL_LIST_ENTRY(entry); | |
3408 | flush_commit_list(p_s_sb, jl, 1); | |
3409 | } | |
3410 | unlock_kernel(); | |
3411 | /* | |
3412 | * this is a little racey, but there's no harm in missing | |
3413 | * the filemap_fdata_write | |
3414 | */ | |
3415 | if (!atomic_read(&journal->j_async_throttle) | |
3416 | && !reiserfs_is_journal_aborted(journal)) { | |
3417 | atomic_inc(&journal->j_async_throttle); | |
3418 | filemap_fdatawrite(p_s_sb->s_bdev->bd_inode->i_mapping); | |
3419 | atomic_dec(&journal->j_async_throttle); | |
3420 | } | |
1da177e4 LT |
3421 | } |
3422 | ||
3423 | /* | |
3424 | ** flushes any old transactions to disk | |
3425 | ** ends the current transaction if it is too old | |
3426 | */ | |
bd4c625c LT |
3427 | int reiserfs_flush_old_commits(struct super_block *p_s_sb) |
3428 | { | |
3429 | time_t now; | |
3430 | struct reiserfs_transaction_handle th; | |
3431 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
3432 | ||
3433 | now = get_seconds(); | |
3434 | /* safety check so we don't flush while we are replaying the log during | |
3435 | * mount | |
3436 | */ | |
3437 | if (list_empty(&journal->j_journal_list)) { | |
3438 | return 0; | |
3439 | } | |
3440 | ||
3441 | /* check the current transaction. If there are no writers, and it is | |
3442 | * too old, finish it, and force the commit blocks to disk | |
3443 | */ | |
3444 | if (atomic_read(&journal->j_wcount) <= 0 && | |
3445 | journal->j_trans_start_time > 0 && | |
3446 | journal->j_len > 0 && | |
3447 | (now - journal->j_trans_start_time) > journal->j_max_trans_age) { | |
3448 | if (!journal_join(&th, p_s_sb, 1)) { | |
3449 | reiserfs_prepare_for_journal(p_s_sb, | |
3450 | SB_BUFFER_WITH_SB(p_s_sb), | |
3451 | 1); | |
3452 | journal_mark_dirty(&th, p_s_sb, | |
3453 | SB_BUFFER_WITH_SB(p_s_sb)); | |
3454 | ||
3455 | /* we're only being called from kreiserfsd, it makes no sense to do | |
3456 | ** an async commit so that kreiserfsd can do it later | |
3457 | */ | |
3458 | do_journal_end(&th, p_s_sb, 1, COMMIT_NOW | WAIT); | |
3459 | } | |
3460 | } | |
3461 | return p_s_sb->s_dirt; | |
1da177e4 LT |
3462 | } |
3463 | ||
3464 | /* | |
3465 | ** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit | |
3466 | ** | |
3467 | ** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all | |
3468 | ** the writers are done. By the time it wakes up, the transaction it was called has already ended, so it just | |
3469 | ** flushes the commit list and returns 0. | |
3470 | ** | |
3471 | ** Won't batch when flush or commit_now is set. Also won't batch when others are waiting on j_join_wait. | |
3472 | ** | |
3473 | ** Note, we can't allow the journal_end to proceed while there are still writers in the log. | |
3474 | */ | |
bd4c625c LT |
3475 | static int check_journal_end(struct reiserfs_transaction_handle *th, |
3476 | struct super_block *p_s_sb, unsigned long nblocks, | |
3477 | int flags) | |
3478 | { | |
3479 | ||
3480 | time_t now; | |
3481 | int flush = flags & FLUSH_ALL; | |
3482 | int commit_now = flags & COMMIT_NOW; | |
3483 | int wait_on_commit = flags & WAIT; | |
3484 | struct reiserfs_journal_list *jl; | |
3485 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
3486 | ||
3487 | BUG_ON(!th->t_trans_id); | |
3488 | ||
3489 | if (th->t_trans_id != journal->j_trans_id) { | |
3490 | reiserfs_panic(th->t_super, | |
3491 | "journal-1577: handle trans id %ld != current trans id %ld\n", | |
3492 | th->t_trans_id, journal->j_trans_id); | |
3493 | } | |
3494 | ||
3495 | journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged); | |
3496 | if (atomic_read(&(journal->j_wcount)) > 0) { /* <= 0 is allowed. unmounting might not call begin */ | |
3497 | atomic_dec(&(journal->j_wcount)); | |
3498 | } | |
3499 | ||
3500 | /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released | |
3501 | ** will be dealt with by next transaction that actually writes something, but should be taken | |
3502 | ** care of in this trans | |
3503 | */ | |
3504 | if (journal->j_len == 0) { | |
3505 | BUG(); | |
3506 | } | |
3507 | /* if wcount > 0, and we are called to with flush or commit_now, | |
3508 | ** we wait on j_join_wait. We will wake up when the last writer has | |
3509 | ** finished the transaction, and started it on its way to the disk. | |
3510 | ** Then, we flush the commit or journal list, and just return 0 | |
3511 | ** because the rest of journal end was already done for this transaction. | |
3512 | */ | |
3513 | if (atomic_read(&(journal->j_wcount)) > 0) { | |
3514 | if (flush || commit_now) { | |
3515 | unsigned trans_id; | |
3516 | ||
3517 | jl = journal->j_current_jl; | |
3518 | trans_id = jl->j_trans_id; | |
3519 | if (wait_on_commit) | |
3520 | jl->j_state |= LIST_COMMIT_PENDING; | |
3521 | atomic_set(&(journal->j_jlock), 1); | |
3522 | if (flush) { | |
3523 | journal->j_next_full_flush = 1; | |
3524 | } | |
3525 | unlock_journal(p_s_sb); | |
3526 | ||
3527 | /* sleep while the current transaction is still j_jlocked */ | |
3528 | while (journal->j_trans_id == trans_id) { | |
3529 | if (atomic_read(&journal->j_jlock)) { | |
3530 | queue_log_writer(p_s_sb); | |
3531 | } else { | |
3532 | lock_journal(p_s_sb); | |
3533 | if (journal->j_trans_id == trans_id) { | |
3534 | atomic_set(&(journal->j_jlock), | |
3535 | 1); | |
3536 | } | |
3537 | unlock_journal(p_s_sb); | |
3538 | } | |
3539 | } | |
3540 | if (journal->j_trans_id == trans_id) { | |
3541 | BUG(); | |
3542 | } | |
3543 | if (commit_now | |
3544 | && journal_list_still_alive(p_s_sb, trans_id) | |
3545 | && wait_on_commit) { | |
3546 | flush_commit_list(p_s_sb, jl, 1); | |
3547 | } | |
3548 | return 0; | |
3549 | } | |
3550 | unlock_journal(p_s_sb); | |
3551 | return 0; | |
3552 | } | |
3553 | ||
3554 | /* deal with old transactions where we are the last writers */ | |
3555 | now = get_seconds(); | |
3556 | if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) { | |
3557 | commit_now = 1; | |
3558 | journal->j_next_async_flush = 1; | |
3559 | } | |
3560 | /* don't batch when someone is waiting on j_join_wait */ | |
3561 | /* don't batch when syncing the commit or flushing the whole trans */ | |
3562 | if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock))) | |
3563 | && !flush && !commit_now && (journal->j_len < journal->j_max_batch) | |
3564 | && journal->j_len_alloc < journal->j_max_batch | |
3565 | && journal->j_cnode_free > (journal->j_trans_max * 3)) { | |
3566 | journal->j_bcount++; | |
3567 | unlock_journal(p_s_sb); | |
3568 | return 0; | |
3569 | } | |
3570 | ||
3571 | if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(p_s_sb)) { | |
3572 | reiserfs_panic(p_s_sb, | |
3573 | "journal-003: journal_end: j_start (%ld) is too high\n", | |
3574 | journal->j_start); | |
3575 | } | |
3576 | return 1; | |
1da177e4 LT |
3577 | } |
3578 | ||
3579 | /* | |
3580 | ** Does all the work that makes deleting blocks safe. | |
3581 | ** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on. | |
3582 | ** | |
3583 | ** otherwise: | |
3584 | ** set a bit for the block in the journal bitmap. That will prevent it from being allocated for unformatted nodes | |
3585 | ** before this transaction has finished. | |
3586 | ** | |
3587 | ** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. That will prevent any old transactions with | |
3588 | ** this block from trying to flush to the real location. Since we aren't removing the cnode from the journal_list_hash, | |
3589 | ** the block can't be reallocated yet. | |
3590 | ** | |
3591 | ** Then remove it from the current transaction, decrementing any counters and filing it on the clean list. | |
3592 | */ | |
bd4c625c LT |
3593 | int journal_mark_freed(struct reiserfs_transaction_handle *th, |
3594 | struct super_block *p_s_sb, b_blocknr_t blocknr) | |
3595 | { | |
3596 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
3597 | struct reiserfs_journal_cnode *cn = NULL; | |
3598 | struct buffer_head *bh = NULL; | |
3599 | struct reiserfs_list_bitmap *jb = NULL; | |
3600 | int cleaned = 0; | |
3601 | BUG_ON(!th->t_trans_id); | |
3602 | ||
3603 | cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, blocknr); | |
3604 | if (cn && cn->bh) { | |
3605 | bh = cn->bh; | |
3606 | get_bh(bh); | |
3607 | } | |
3608 | /* if it is journal new, we just remove it from this transaction */ | |
3609 | if (bh && buffer_journal_new(bh)) { | |
3610 | clear_buffer_journal_new(bh); | |
3611 | clear_prepared_bits(bh); | |
3612 | reiserfs_clean_and_file_buffer(bh); | |
3613 | cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned); | |
3614 | } else { | |
3615 | /* set the bit for this block in the journal bitmap for this transaction */ | |
3616 | jb = journal->j_current_jl->j_list_bitmap; | |
3617 | if (!jb) { | |
3618 | reiserfs_panic(p_s_sb, | |
3619 | "journal-1702: journal_mark_freed, journal_list_bitmap is NULL\n"); | |
3620 | } | |
3621 | set_bit_in_list_bitmap(p_s_sb, blocknr, jb); | |
3622 | ||
3623 | /* Note, the entire while loop is not allowed to schedule. */ | |
3624 | ||
3625 | if (bh) { | |
3626 | clear_prepared_bits(bh); | |
3627 | reiserfs_clean_and_file_buffer(bh); | |
3628 | } | |
3629 | cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned); | |
3630 | ||
3631 | /* find all older transactions with this block, make sure they don't try to write it out */ | |
3632 | cn = get_journal_hash_dev(p_s_sb, journal->j_list_hash_table, | |
3633 | blocknr); | |
3634 | while (cn) { | |
3635 | if (p_s_sb == cn->sb && blocknr == cn->blocknr) { | |
3636 | set_bit(BLOCK_FREED, &cn->state); | |
3637 | if (cn->bh) { | |
3638 | if (!cleaned) { | |
3639 | /* remove_from_transaction will brelse the buffer if it was | |
3640 | ** in the current trans | |
3641 | */ | |
3642 | clear_buffer_journal_dirty(cn-> | |
3643 | bh); | |
3644 | clear_buffer_dirty(cn->bh); | |
3645 | clear_buffer_journal_test(cn-> | |
3646 | bh); | |
3647 | cleaned = 1; | |
3648 | put_bh(cn->bh); | |
3649 | if (atomic_read | |
3650 | (&(cn->bh->b_count)) < 0) { | |
3651 | reiserfs_warning(p_s_sb, | |
3652 | "journal-2138: cn->bh->b_count < 0"); | |
3653 | } | |
3654 | } | |
3655 | if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */ | |
3656 | atomic_dec(& | |
3657 | (cn->jlist-> | |
3658 | j_nonzerolen)); | |
3659 | } | |
3660 | cn->bh = NULL; | |
3661 | } | |
3662 | } | |
3663 | cn = cn->hnext; | |
3664 | } | |
3665 | } | |
3666 | ||
3667 | if (bh) { | |
3668 | put_bh(bh); /* get_hash grabs the buffer */ | |
3669 | if (atomic_read(&(bh->b_count)) < 0) { | |
3670 | reiserfs_warning(p_s_sb, | |
3671 | "journal-2165: bh->b_count < 0"); | |
3672 | } | |
3673 | } | |
3674 | return 0; | |
3675 | } | |
3676 | ||
3677 | void reiserfs_update_inode_transaction(struct inode *inode) | |
3678 | { | |
3679 | struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb); | |
3680 | REISERFS_I(inode)->i_jl = journal->j_current_jl; | |
3681 | REISERFS_I(inode)->i_trans_id = journal->j_trans_id; | |
1da177e4 LT |
3682 | } |
3683 | ||
3684 | /* | |
3685 | * returns -1 on error, 0 if no commits/barriers were done and 1 | |
3686 | * if a transaction was actually committed and the barrier was done | |
3687 | */ | |
3688 | static int __commit_trans_jl(struct inode *inode, unsigned long id, | |
bd4c625c | 3689 | struct reiserfs_journal_list *jl) |
1da177e4 | 3690 | { |
bd4c625c LT |
3691 | struct reiserfs_transaction_handle th; |
3692 | struct super_block *sb = inode->i_sb; | |
3693 | struct reiserfs_journal *journal = SB_JOURNAL(sb); | |
3694 | int ret = 0; | |
3695 | ||
3696 | /* is it from the current transaction, or from an unknown transaction? */ | |
3697 | if (id == journal->j_trans_id) { | |
3698 | jl = journal->j_current_jl; | |
3699 | /* try to let other writers come in and grow this transaction */ | |
3700 | let_transaction_grow(sb, id); | |
3701 | if (journal->j_trans_id != id) { | |
3702 | goto flush_commit_only; | |
3703 | } | |
1da177e4 | 3704 | |
bd4c625c LT |
3705 | ret = journal_begin(&th, sb, 1); |
3706 | if (ret) | |
3707 | return ret; | |
3708 | ||
3709 | /* someone might have ended this transaction while we joined */ | |
3710 | if (journal->j_trans_id != id) { | |
3711 | reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), | |
3712 | 1); | |
3713 | journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb)); | |
3714 | ret = journal_end(&th, sb, 1); | |
3715 | goto flush_commit_only; | |
3716 | } | |
1da177e4 | 3717 | |
bd4c625c LT |
3718 | ret = journal_end_sync(&th, sb, 1); |
3719 | if (!ret) | |
3720 | ret = 1; | |
1da177e4 | 3721 | |
bd4c625c LT |
3722 | } else { |
3723 | /* this gets tricky, we have to make sure the journal list in | |
3724 | * the inode still exists. We know the list is still around | |
3725 | * if we've got a larger transaction id than the oldest list | |
3726 | */ | |
3727 | flush_commit_only: | |
3728 | if (journal_list_still_alive(inode->i_sb, id)) { | |
3729 | /* | |
3730 | * we only set ret to 1 when we know for sure | |
3731 | * the barrier hasn't been started yet on the commit | |
3732 | * block. | |
3733 | */ | |
3734 | if (atomic_read(&jl->j_commit_left) > 1) | |
3735 | ret = 1; | |
3736 | flush_commit_list(sb, jl, 1); | |
3737 | if (journal->j_errno) | |
3738 | ret = journal->j_errno; | |
3739 | } | |
1da177e4 | 3740 | } |
bd4c625c LT |
3741 | /* otherwise the list is gone, and long since committed */ |
3742 | return ret; | |
3743 | } | |
1da177e4 | 3744 | |
bd4c625c LT |
3745 | int reiserfs_commit_for_inode(struct inode *inode) |
3746 | { | |
3747 | unsigned long id = REISERFS_I(inode)->i_trans_id; | |
3748 | struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl; | |
1da177e4 | 3749 | |
bd4c625c LT |
3750 | /* for the whole inode, assume unset id means it was |
3751 | * changed in the current transaction. More conservative | |
1da177e4 | 3752 | */ |
bd4c625c LT |
3753 | if (!id || !jl) { |
3754 | reiserfs_update_inode_transaction(inode); | |
3755 | id = REISERFS_I(inode)->i_trans_id; | |
3756 | /* jl will be updated in __commit_trans_jl */ | |
3757 | } | |
3758 | ||
3759 | return __commit_trans_jl(inode, id, jl); | |
3760 | } | |
3761 | ||
3762 | void reiserfs_restore_prepared_buffer(struct super_block *p_s_sb, | |
3763 | struct buffer_head *bh) | |
3764 | { | |
3765 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
3766 | PROC_INFO_INC(p_s_sb, journal.restore_prepared); | |
3767 | if (!bh) { | |
3768 | return; | |
3769 | } | |
3770 | if (test_clear_buffer_journal_restore_dirty(bh) && | |
3771 | buffer_journal_dirty(bh)) { | |
3772 | struct reiserfs_journal_cnode *cn; | |
3773 | cn = get_journal_hash_dev(p_s_sb, | |
3774 | journal->j_list_hash_table, | |
3775 | bh->b_blocknr); | |
3776 | if (cn && can_dirty(cn)) { | |
3777 | set_buffer_journal_test(bh); | |
3778 | mark_buffer_dirty(bh); | |
3779 | } | |
3780 | } | |
3781 | clear_buffer_journal_prepared(bh); | |
3782 | } | |
3783 | ||
3784 | extern struct tree_balance *cur_tb; | |
1da177e4 LT |
3785 | /* |
3786 | ** before we can change a metadata block, we have to make sure it won't | |
3787 | ** be written to disk while we are altering it. So, we must: | |
3788 | ** clean it | |
3789 | ** wait on it. | |
3790 | ** | |
3791 | */ | |
3792 | int reiserfs_prepare_for_journal(struct super_block *p_s_sb, | |
bd4c625c LT |
3793 | struct buffer_head *bh, int wait) |
3794 | { | |
3795 | PROC_INFO_INC(p_s_sb, journal.prepare); | |
3796 | ||
3797 | if (test_set_buffer_locked(bh)) { | |
3798 | if (!wait) | |
3799 | return 0; | |
3800 | lock_buffer(bh); | |
3801 | } | |
3802 | set_buffer_journal_prepared(bh); | |
3803 | if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) { | |
3804 | clear_buffer_journal_test(bh); | |
3805 | set_buffer_journal_restore_dirty(bh); | |
3806 | } | |
3807 | unlock_buffer(bh); | |
3808 | return 1; | |
3809 | } | |
3810 | ||
3811 | static void flush_old_journal_lists(struct super_block *s) | |
3812 | { | |
3813 | struct reiserfs_journal *journal = SB_JOURNAL(s); | |
3814 | struct reiserfs_journal_list *jl; | |
3815 | struct list_head *entry; | |
3816 | time_t now = get_seconds(); | |
3817 | ||
3818 | while (!list_empty(&journal->j_journal_list)) { | |
3819 | entry = journal->j_journal_list.next; | |
3820 | jl = JOURNAL_LIST_ENTRY(entry); | |
3821 | /* this check should always be run, to send old lists to disk */ | |
3822 | if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4))) { | |
3823 | flush_used_journal_lists(s, jl); | |
3824 | } else { | |
3825 | break; | |
3826 | } | |
1da177e4 | 3827 | } |
1da177e4 LT |
3828 | } |
3829 | ||
3830 | /* | |
3831 | ** long and ugly. If flush, will not return until all commit | |
3832 | ** blocks and all real buffers in the trans are on disk. | |
3833 | ** If no_async, won't return until all commit blocks are on disk. | |
3834 | ** | |
3835 | ** keep reading, there are comments as you go along | |
3836 | ** | |
3837 | ** If the journal is aborted, we just clean up. Things like flushing | |
3838 | ** journal lists, etc just won't happen. | |
3839 | */ | |
bd4c625c LT |
3840 | static int do_journal_end(struct reiserfs_transaction_handle *th, |
3841 | struct super_block *p_s_sb, unsigned long nblocks, | |
3842 | int flags) | |
3843 | { | |
3844 | struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb); | |
3845 | struct reiserfs_journal_cnode *cn, *next, *jl_cn; | |
3846 | struct reiserfs_journal_cnode *last_cn = NULL; | |
3847 | struct reiserfs_journal_desc *desc; | |
3848 | struct reiserfs_journal_commit *commit; | |
3849 | struct buffer_head *c_bh; /* commit bh */ | |
3850 | struct buffer_head *d_bh; /* desc bh */ | |
3851 | int cur_write_start = 0; /* start index of current log write */ | |
3852 | int old_start; | |
3853 | int i; | |
3854 | int flush = flags & FLUSH_ALL; | |
3855 | int wait_on_commit = flags & WAIT; | |
3856 | struct reiserfs_journal_list *jl, *temp_jl; | |
3857 | struct list_head *entry, *safe; | |
3858 | unsigned long jindex; | |
3859 | unsigned long commit_trans_id; | |
3860 | int trans_half; | |
3861 | ||
3862 | BUG_ON(th->t_refcount > 1); | |
3863 | BUG_ON(!th->t_trans_id); | |
3864 | ||
3865 | put_fs_excl(); | |
3866 | current->journal_info = th->t_handle_save; | |
3867 | reiserfs_check_lock_depth(p_s_sb, "journal end"); | |
3868 | if (journal->j_len == 0) { | |
3869 | reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), | |
3870 | 1); | |
3871 | journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)); | |
3872 | } | |
1da177e4 | 3873 | |
bd4c625c LT |
3874 | lock_journal(p_s_sb); |
3875 | if (journal->j_next_full_flush) { | |
3876 | flags |= FLUSH_ALL; | |
3877 | flush = 1; | |
3878 | } | |
3879 | if (journal->j_next_async_flush) { | |
3880 | flags |= COMMIT_NOW | WAIT; | |
3881 | wait_on_commit = 1; | |
3882 | } | |
3883 | ||
3884 | /* check_journal_end locks the journal, and unlocks if it does not return 1 | |
3885 | ** it tells us if we should continue with the journal_end, or just return | |
3886 | */ | |
3887 | if (!check_journal_end(th, p_s_sb, nblocks, flags)) { | |
3888 | p_s_sb->s_dirt = 1; | |
3889 | wake_queued_writers(p_s_sb); | |
3890 | reiserfs_async_progress_wait(p_s_sb); | |
3891 | goto out; | |
3892 | } | |
3893 | ||
3894 | /* check_journal_end might set these, check again */ | |
3895 | if (journal->j_next_full_flush) { | |
3896 | flush = 1; | |
3897 | } | |
3898 | ||
3899 | /* | |
3900 | ** j must wait means we have to flush the log blocks, and the real blocks for | |
3901 | ** this transaction | |
3902 | */ | |
3903 | if (journal->j_must_wait > 0) { | |
3904 | flush = 1; | |
3905 | } | |
1da177e4 | 3906 | #ifdef REISERFS_PREALLOCATE |
ef43bc4f JK |
3907 | /* quota ops might need to nest, setup the journal_info pointer for them |
3908 | * and raise the refcount so that it is > 0. */ | |
bd4c625c | 3909 | current->journal_info = th; |
ef43bc4f | 3910 | th->t_refcount++; |
bd4c625c LT |
3911 | reiserfs_discard_all_prealloc(th); /* it should not involve new blocks into |
3912 | * the transaction */ | |
ef43bc4f | 3913 | th->t_refcount--; |
bd4c625c | 3914 | current->journal_info = th->t_handle_save; |
1da177e4 | 3915 | #endif |
bd4c625c LT |
3916 | |
3917 | /* setup description block */ | |
3918 | d_bh = | |
3919 | journal_getblk(p_s_sb, | |
3920 | SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + | |
3921 | journal->j_start); | |
3922 | set_buffer_uptodate(d_bh); | |
3923 | desc = (struct reiserfs_journal_desc *)(d_bh)->b_data; | |
3924 | memset(d_bh->b_data, 0, d_bh->b_size); | |
3925 | memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8); | |
3926 | set_desc_trans_id(desc, journal->j_trans_id); | |
3927 | ||
3928 | /* setup commit block. Don't write (keep it clean too) this one until after everyone else is written */ | |
3929 | c_bh = journal_getblk(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + | |
3930 | ((journal->j_start + journal->j_len + | |
3931 | 1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb))); | |
3932 | commit = (struct reiserfs_journal_commit *)c_bh->b_data; | |
3933 | memset(c_bh->b_data, 0, c_bh->b_size); | |
3934 | set_commit_trans_id(commit, journal->j_trans_id); | |
3935 | set_buffer_uptodate(c_bh); | |
3936 | ||
3937 | /* init this journal list */ | |
3938 | jl = journal->j_current_jl; | |
3939 | ||
3940 | /* we lock the commit before doing anything because | |
3941 | * we want to make sure nobody tries to run flush_commit_list until | |
3942 | * the new transaction is fully setup, and we've already flushed the | |
3943 | * ordered bh list | |
3944 | */ | |
3945 | down(&jl->j_commit_lock); | |
3946 | ||
3947 | /* save the transaction id in case we need to commit it later */ | |
3948 | commit_trans_id = jl->j_trans_id; | |
3949 | ||
3950 | atomic_set(&jl->j_older_commits_done, 0); | |
3951 | jl->j_trans_id = journal->j_trans_id; | |
3952 | jl->j_timestamp = journal->j_trans_start_time; | |
3953 | jl->j_commit_bh = c_bh; | |
3954 | jl->j_start = journal->j_start; | |
3955 | jl->j_len = journal->j_len; | |
3956 | atomic_set(&jl->j_nonzerolen, journal->j_len); | |
3957 | atomic_set(&jl->j_commit_left, journal->j_len + 2); | |
3958 | jl->j_realblock = NULL; | |
3959 | ||
3960 | /* The ENTIRE FOR LOOP MUST not cause schedule to occur. | |
3961 | ** for each real block, add it to the journal list hash, | |
3962 | ** copy into real block index array in the commit or desc block | |
3963 | */ | |
3964 | trans_half = journal_trans_half(p_s_sb->s_blocksize); | |
3965 | for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) { | |
3966 | if (buffer_journaled(cn->bh)) { | |
3967 | jl_cn = get_cnode(p_s_sb); | |
3968 | if (!jl_cn) { | |
3969 | reiserfs_panic(p_s_sb, | |
3970 | "journal-1676, get_cnode returned NULL\n"); | |
3971 | } | |
3972 | if (i == 0) { | |
3973 | jl->j_realblock = jl_cn; | |
3974 | } | |
3975 | jl_cn->prev = last_cn; | |
3976 | jl_cn->next = NULL; | |
3977 | if (last_cn) { | |
3978 | last_cn->next = jl_cn; | |
3979 | } | |
3980 | last_cn = jl_cn; | |
3981 | /* make sure the block we are trying to log is not a block | |
3982 | of journal or reserved area */ | |
3983 | ||
3984 | if (is_block_in_log_or_reserved_area | |
3985 | (p_s_sb, cn->bh->b_blocknr)) { | |
3986 | reiserfs_panic(p_s_sb, | |
3987 | "journal-2332: Trying to log block %lu, which is a log block\n", | |
3988 | cn->bh->b_blocknr); | |
3989 | } | |
3990 | jl_cn->blocknr = cn->bh->b_blocknr; | |
3991 | jl_cn->state = 0; | |
3992 | jl_cn->sb = p_s_sb; | |
3993 | jl_cn->bh = cn->bh; | |
3994 | jl_cn->jlist = jl; | |
3995 | insert_journal_hash(journal->j_list_hash_table, jl_cn); | |
3996 | if (i < trans_half) { | |
3997 | desc->j_realblock[i] = | |
3998 | cpu_to_le32(cn->bh->b_blocknr); | |
3999 | } else { | |
4000 | commit->j_realblock[i - trans_half] = | |
4001 | cpu_to_le32(cn->bh->b_blocknr); | |
4002 | } | |
4003 | } else { | |
4004 | i--; | |
4005 | } | |
4006 | } | |
4007 | set_desc_trans_len(desc, journal->j_len); | |
4008 | set_desc_mount_id(desc, journal->j_mount_id); | |
4009 | set_desc_trans_id(desc, journal->j_trans_id); | |
4010 | set_commit_trans_len(commit, journal->j_len); | |
4011 | ||
4012 | /* special check in case all buffers in the journal were marked for not logging */ | |
4013 | if (journal->j_len == 0) { | |
4014 | BUG(); | |
4015 | } | |
4016 | ||
4017 | /* we're about to dirty all the log blocks, mark the description block | |
4018 | * dirty now too. Don't mark the commit block dirty until all the | |
4019 | * others are on disk | |
4020 | */ | |
4021 | mark_buffer_dirty(d_bh); | |
4022 | ||
4023 | /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */ | |
4024 | cur_write_start = journal->j_start; | |
4025 | cn = journal->j_first; | |
4026 | jindex = 1; /* start at one so we don't get the desc again */ | |
4027 | while (cn) { | |
4028 | clear_buffer_journal_new(cn->bh); | |
4029 | /* copy all the real blocks into log area. dirty log blocks */ | |
4030 | if (buffer_journaled(cn->bh)) { | |
4031 | struct buffer_head *tmp_bh; | |
4032 | char *addr; | |
4033 | struct page *page; | |
4034 | tmp_bh = | |
4035 | journal_getblk(p_s_sb, | |
4036 | SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + | |
4037 | ((cur_write_start + | |
4038 | jindex) % | |
4039 | SB_ONDISK_JOURNAL_SIZE(p_s_sb))); | |
4040 | set_buffer_uptodate(tmp_bh); | |
4041 | page = cn->bh->b_page; | |
4042 | addr = kmap(page); | |
4043 | memcpy(tmp_bh->b_data, | |
4044 | addr + offset_in_page(cn->bh->b_data), | |
4045 | cn->bh->b_size); | |
4046 | kunmap(page); | |
4047 | mark_buffer_dirty(tmp_bh); | |
4048 | jindex++; | |
4049 | set_buffer_journal_dirty(cn->bh); | |
4050 | clear_buffer_journaled(cn->bh); | |
4051 | } else { | |
4052 | /* JDirty cleared sometime during transaction. don't log this one */ | |
4053 | reiserfs_warning(p_s_sb, | |
4054 | "journal-2048: do_journal_end: BAD, buffer in journal hash, but not JDirty!"); | |
4055 | brelse(cn->bh); | |
4056 | } | |
4057 | next = cn->next; | |
4058 | free_cnode(p_s_sb, cn); | |
4059 | cn = next; | |
4060 | cond_resched(); | |
4061 | } | |
4062 | ||
4063 | /* we are done with both the c_bh and d_bh, but | |
4064 | ** c_bh must be written after all other commit blocks, | |
4065 | ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1. | |
4066 | */ | |
4067 | ||
4068 | journal->j_current_jl = alloc_journal_list(p_s_sb); | |
4069 | ||
4070 | /* now it is safe to insert this transaction on the main list */ | |
4071 | list_add_tail(&jl->j_list, &journal->j_journal_list); | |
4072 | list_add_tail(&jl->j_working_list, &journal->j_working_list); | |
4073 | journal->j_num_work_lists++; | |
4074 | ||
4075 | /* reset journal values for the next transaction */ | |
4076 | old_start = journal->j_start; | |
4077 | journal->j_start = | |
4078 | (journal->j_start + journal->j_len + | |
4079 | 2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb); | |
4080 | atomic_set(&(journal->j_wcount), 0); | |
4081 | journal->j_bcount = 0; | |
4082 | journal->j_last = NULL; | |
4083 | journal->j_first = NULL; | |
4084 | journal->j_len = 0; | |
4085 | journal->j_trans_start_time = 0; | |
4086 | journal->j_trans_id++; | |
4087 | journal->j_current_jl->j_trans_id = journal->j_trans_id; | |
4088 | journal->j_must_wait = 0; | |
4089 | journal->j_len_alloc = 0; | |
4090 | journal->j_next_full_flush = 0; | |
4091 | journal->j_next_async_flush = 0; | |
4092 | init_journal_hash(p_s_sb); | |
4093 | ||
4094 | // make sure reiserfs_add_jh sees the new current_jl before we | |
4095 | // write out the tails | |
4096 | smp_mb(); | |
4097 | ||
4098 | /* tail conversion targets have to hit the disk before we end the | |
4099 | * transaction. Otherwise a later transaction might repack the tail | |
4100 | * before this transaction commits, leaving the data block unflushed and | |
4101 | * clean, if we crash before the later transaction commits, the data block | |
4102 | * is lost. | |
4103 | */ | |
4104 | if (!list_empty(&jl->j_tail_bh_list)) { | |
4105 | unlock_kernel(); | |
4106 | write_ordered_buffers(&journal->j_dirty_buffers_lock, | |
4107 | journal, jl, &jl->j_tail_bh_list); | |
4108 | lock_kernel(); | |
4109 | } | |
4110 | if (!list_empty(&jl->j_tail_bh_list)) | |
4111 | BUG(); | |
4112 | up(&jl->j_commit_lock); | |
4113 | ||
4114 | /* honor the flush wishes from the caller, simple commits can | |
4115 | ** be done outside the journal lock, they are done below | |
4116 | ** | |
4117 | ** if we don't flush the commit list right now, we put it into | |
4118 | ** the work queue so the people waiting on the async progress work | |
4119 | ** queue don't wait for this proc to flush journal lists and such. | |
4120 | */ | |
4121 | if (flush) { | |
4122 | flush_commit_list(p_s_sb, jl, 1); | |
4123 | flush_journal_list(p_s_sb, jl, 1); | |
4124 | } else if (!(jl->j_state & LIST_COMMIT_PENDING)) | |
4125 | queue_delayed_work(commit_wq, &journal->j_work, HZ / 10); | |
4126 | ||
4127 | /* if the next transaction has any chance of wrapping, flush | |
4128 | ** transactions that might get overwritten. If any journal lists are very | |
4129 | ** old flush them as well. | |
4130 | */ | |
4131 | first_jl: | |
4132 | list_for_each_safe(entry, safe, &journal->j_journal_list) { | |
4133 | temp_jl = JOURNAL_LIST_ENTRY(entry); | |
4134 | if (journal->j_start <= temp_jl->j_start) { | |
4135 | if ((journal->j_start + journal->j_trans_max + 1) >= | |
4136 | temp_jl->j_start) { | |
4137 | flush_used_journal_lists(p_s_sb, temp_jl); | |
4138 | goto first_jl; | |
4139 | } else if ((journal->j_start + | |
4140 | journal->j_trans_max + 1) < | |
4141 | SB_ONDISK_JOURNAL_SIZE(p_s_sb)) { | |
4142 | /* if we don't cross into the next transaction and we don't | |
4143 | * wrap, there is no way we can overlap any later transactions | |
4144 | * break now | |
4145 | */ | |
4146 | break; | |
4147 | } | |
4148 | } else if ((journal->j_start + | |
4149 | journal->j_trans_max + 1) > | |
4150 | SB_ONDISK_JOURNAL_SIZE(p_s_sb)) { | |
4151 | if (((journal->j_start + journal->j_trans_max + 1) % | |
4152 | SB_ONDISK_JOURNAL_SIZE(p_s_sb)) >= | |
4153 | temp_jl->j_start) { | |
4154 | flush_used_journal_lists(p_s_sb, temp_jl); | |
4155 | goto first_jl; | |
4156 | } else { | |
4157 | /* we don't overlap anything from out start to the end of the | |
4158 | * log, and our wrapped portion doesn't overlap anything at | |
4159 | * the start of the log. We can break | |
4160 | */ | |
4161 | break; | |
4162 | } | |
4163 | } | |
4164 | } | |
4165 | flush_old_journal_lists(p_s_sb); | |
4166 | ||
4167 | journal->j_current_jl->j_list_bitmap = | |
4168 | get_list_bitmap(p_s_sb, journal->j_current_jl); | |
4169 | ||
4170 | if (!(journal->j_current_jl->j_list_bitmap)) { | |
4171 | reiserfs_panic(p_s_sb, | |
4172 | "journal-1996: do_journal_end, could not get a list bitmap\n"); | |
4173 | } | |
4174 | ||
4175 | atomic_set(&(journal->j_jlock), 0); | |
4176 | unlock_journal(p_s_sb); | |
4177 | /* wake up any body waiting to join. */ | |
4178 | clear_bit(J_WRITERS_QUEUED, &journal->j_state); | |
4179 | wake_up(&(journal->j_join_wait)); | |
4180 | ||
4181 | if (!flush && wait_on_commit && | |
4182 | journal_list_still_alive(p_s_sb, commit_trans_id)) { | |
4183 | flush_commit_list(p_s_sb, jl, 1); | |
4184 | } | |
4185 | out: | |
4186 | reiserfs_check_lock_depth(p_s_sb, "journal end2"); | |
4187 | ||
4188 | memset(th, 0, sizeof(*th)); | |
4189 | /* Re-set th->t_super, so we can properly keep track of how many | |
4190 | * persistent transactions there are. We need to do this so if this | |
4191 | * call is part of a failed restart_transaction, we can free it later */ | |
4192 | th->t_super = p_s_sb; | |
4193 | ||
4194 | return journal->j_errno; | |
4195 | } | |
4196 | ||
4197 | static void __reiserfs_journal_abort_hard(struct super_block *sb) | |
4198 | { | |
4199 | struct reiserfs_journal *journal = SB_JOURNAL(sb); | |
4200 | if (test_bit(J_ABORTED, &journal->j_state)) | |
4201 | return; | |
4202 | ||
4203 | printk(KERN_CRIT "REISERFS: Aborting journal for filesystem on %s\n", | |
4204 | reiserfs_bdevname(sb)); | |
4205 | ||
4206 | sb->s_flags |= MS_RDONLY; | |
4207 | set_bit(J_ABORTED, &journal->j_state); | |
1da177e4 LT |
4208 | |
4209 | #ifdef CONFIG_REISERFS_CHECK | |
bd4c625c | 4210 | dump_stack(); |
1da177e4 LT |
4211 | #endif |
4212 | } | |
4213 | ||
bd4c625c | 4214 | static void __reiserfs_journal_abort_soft(struct super_block *sb, int errno) |
1da177e4 | 4215 | { |
bd4c625c LT |
4216 | struct reiserfs_journal *journal = SB_JOURNAL(sb); |
4217 | if (test_bit(J_ABORTED, &journal->j_state)) | |
4218 | return; | |
1da177e4 | 4219 | |
bd4c625c LT |
4220 | if (!journal->j_errno) |
4221 | journal->j_errno = errno; | |
1da177e4 | 4222 | |
bd4c625c | 4223 | __reiserfs_journal_abort_hard(sb); |
1da177e4 LT |
4224 | } |
4225 | ||
bd4c625c | 4226 | void reiserfs_journal_abort(struct super_block *sb, int errno) |
1da177e4 | 4227 | { |
bd4c625c | 4228 | return __reiserfs_journal_abort_soft(sb, errno); |
1da177e4 | 4229 | } |