blob: 1b73529b8099bbb7bc758869c09e8ff27d802ce0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070058/* 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*/
67static int reiserfs_mounted_fs_count;
68
69static struct workqueue_struct *commit_wq;
70
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070071#define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit
72 structs at 4k */
73#define BUFNR 64 /*read ahead */
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
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. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070078#define BLOCK_FREED_HOLDER 3 /* this block was freed during this transaction, and can't be written */
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
80#define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */
81#define BLOCK_DIRTIED 5
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083/* journal list state bits */
84#define LIST_TOUCHED 1
85#define LIST_DIRTY 2
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070086#define LIST_COMMIT_PENDING 4 /* someone will commit this list */
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
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 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070091#define WAIT 4 /* wait for the log blocks to hit the disk */
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070093static int do_journal_end(struct reiserfs_transaction_handle *,
94 struct super_block *, unsigned long nblocks,
95 int flags);
96static int flush_journal_list(struct super_block *s,
97 struct reiserfs_journal_list *jl, int flushall);
98static int flush_commit_list(struct super_block *s,
99 struct reiserfs_journal_list *jl, int flushall);
100static int can_dirty(struct reiserfs_journal_cnode *cn);
101static int journal_join(struct reiserfs_transaction_handle *th,
102 struct super_block *p_s_sb, unsigned long nblocks);
103static int release_journal_dev(struct super_block *super,
104 struct reiserfs_journal *journal);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105static int dirty_one_transaction(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700106 struct reiserfs_journal_list *jl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107static void flush_async_commits(void *p);
108static void queue_log_writer(struct super_block *s);
109
110/* values for join in do_journal_begin_r */
111enum {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700112 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115};
116
117static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700118 struct super_block *p_s_sb,
119 unsigned long nblocks, int join);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700121static 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 *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126}
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*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700133static 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140}
141
142static void disable_barrier(struct super_block *s)
143{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700144 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_BARRIER_FLUSH);
145 printk("reiserfs: disabling flush barriers on %s\n",
146 reiserfs_bdevname(s));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147}
148
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700149static 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
Pekka Enbergd739b422006-02-01 03:06:43 -0800155 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700156 if (!bn) {
157 return NULL;
158 }
Pekka Enbergd739b422006-02-01 03:06:43 -0800159 bn->data = kzalloc(p_s_sb->s_blocksize, GFP_NOFS);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700160 if (!bn->data) {
Pekka Enbergd739b422006-02-01 03:06:43 -0800161 kfree(bn);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700162 return NULL;
163 }
164 bn->id = id++;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700165 INIT_LIST_HEAD(&bn->list);
166 return bn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167}
168
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700169static 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700175 journal->j_used_bitmap_nodes++;
176 repeat:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700178 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191}
192static inline void free_bitmap_node(struct super_block *p_s_sb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700193 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) {
Pekka Enbergd739b422006-02-01 03:06:43 -0800198 kfree(bn->data);
199 kfree(bn);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700200 } else {
201 list_add(&bn->list, &journal->j_bitmap_nodes);
202 journal->j_free_bitmap_nodes++;
203 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204}
205
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700206static 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220}
221
222static int set_bit_in_list_bitmap(struct super_block *p_s_sb, int block,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700223 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700228 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233}
234
235static void cleanup_bitmap_list(struct super_block *p_s_sb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700236 struct reiserfs_list_bitmap *jb)
237{
238 int i;
239 if (jb->bitmaps == NULL)
240 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700242 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248}
249
250/*
251** only call this on FS unmount.
252*/
253static int free_list_bitmaps(struct super_block *p_s_sb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700254 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266}
267
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700268static 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700274 while (next != &journal->j_bitmap_nodes) {
275 bn = list_entry(next, struct reiserfs_bitmap_node, list);
276 list_del(next);
Pekka Enbergd739b422006-02-01 03:06:43 -0800277 kfree(bn->data);
278 kfree(bn);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700279 next = journal->j_bitmap_nodes.next;
280 journal->j_free_bitmap_nodes--;
281 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700283 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284}
285
286/*
287** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
288** jb_array is the array to be filled in.
289*/
290int reiserfs_allocate_list_bitmaps(struct super_block *p_s_sb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700291 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 *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700299 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316}
317
318/*
319** find an available list bitmap. If you can't find one, flush a commit list
320** and try again
321*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700322static 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700330 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350}
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*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700357static 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377}
378
379/*
380** pulls a cnode off the free list, or returns NULL on failure
381*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700382static 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700387 reiserfs_check_lock_depth(p_s_sb, "get_cnode");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700389 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404}
405
406/*
407** returns a cnode to the free list
408*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700409static 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700414 reiserfs_check_lock_depth(p_s_sb, "free_cnode");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700416 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425}
426
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700427static void clear_prepared_bits(struct buffer_head *bh)
428{
429 clear_buffer_journal_prepared(bh);
430 clear_buffer_journal_restore_dirty(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431}
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*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700436void reiserfs_check_lock_depth(struct super_block *sb, char *caller)
437{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438#ifdef CONFIG_SMP
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700439 if (current->lock_depth < 0) {
440 reiserfs_panic(sb, "%s called without kernel lock held",
441 caller);
442 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443#else
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700444 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445#endif
446}
447
448/* return a cnode with same dev, block number and size in table, or null if not found */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700449static 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)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700457 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465}
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*/
485int reiserfs_in_journal(struct super_block *p_s_sb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700486 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700495 *next_zero_bit = 0; /* always start this at zero. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700497 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700521 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700529 /* 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700535 PROC_INFO_INC(p_s_sb, journal.in_journal_reusable);
536 /* safe for reuse */
537 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538}
539
540/* insert cn into table
541*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700542static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
543 struct reiserfs_journal_cnode *cn)
544{
545 struct reiserfs_journal_cnode *cn_orig;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700547 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554}
555
556/* lock the current transaction */
Jesper Juhl77933d72005-07-27 11:46:09 -0700557static inline void lock_journal(struct super_block *p_s_sb)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700558{
559 PROC_INFO_INC(p_s_sb, journal.lock_journal);
560 down(&SB_JOURNAL(p_s_sb)->j_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561}
562
563/* unlock the current transaction */
Jesper Juhl77933d72005-07-27 11:46:09 -0700564static inline void unlock_journal(struct super_block *p_s_sb)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700565{
566 up(&SB_JOURNAL(p_s_sb)->j_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567}
568
569static inline void get_journal_list(struct reiserfs_journal_list *jl)
570{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700571 jl->j_refcount++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572}
573
574static inline void put_journal_list(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700575 struct reiserfs_journal_list *jl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700577 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)
Pekka Enbergd739b422006-02-01 03:06:43 -0800582 kfree(jl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583}
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*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700590static void cleanup_freed_for_journal_list(struct super_block *p_s_sb,
591 struct reiserfs_journal_list *jl)
592{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700594 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600}
601
602static int journal_list_still_alive(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700603 unsigned long trans_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700605 struct reiserfs_journal *journal = SB_JOURNAL(s);
606 struct list_head *entry = &journal->j_journal_list;
607 struct reiserfs_journal_list *jl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700609 if (!list_empty(entry)) {
610 jl = JOURNAL_LIST_ENTRY(entry->next);
611 if (jl->j_trans_id <= trans_id) {
612 return 1;
613 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700615 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616}
617
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700618static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
619{
620 char b[BDEVNAME_SIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700622 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633}
634
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700635static 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643}
644
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700645static 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656}
657
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700658static 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666}
667
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700668static 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676}
677
678static void check_barrier_completion(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700679 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688}
689
690#define CHUNK_SIZE 32
691struct buffer_chunk {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700692 struct buffer_head *bh[CHUNK_SIZE];
693 int nr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694};
695
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700696static 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();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705}
706
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700707static 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();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716}
717
718static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700719 spinlock_t * lock, void (fn) (struct buffer_chunk *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700721 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734}
735
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700737static 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();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748}
749
750/*
751 * we want to free the jh when the buffer has been written
752 * and waited on
753 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700754void reiserfs_free_jh(struct buffer_head *bh)
755{
756 struct reiserfs_jh *jh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700758 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769}
770
771static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700772 int tail)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700774 struct reiserfs_jh *jh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700776 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700797 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805}
806
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700807int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
808{
809 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700811int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
812{
813 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814}
815
816#define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700817static int write_ordered_buffers(spinlock_t * lock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 struct reiserfs_journal *j,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700819 struct reiserfs_journal_list *jl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 struct list_head *list)
821{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700822 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700829 chunk.nr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 spin_lock(lock);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700831 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 }
Chris Mason3d4492f2006-02-01 03:06:49 -0800849 /* in theory, dirty non-uptodate buffers should never get here,
850 * but the upper layer io error paths still have a few quirks.
851 * Handle them here as gracefully as we can
852 */
853 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
854 clear_buffer_dirty(bh);
855 ret = -EIO;
856 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700857 if (buffer_dirty(bh)) {
858 list_del_init(&jh->list);
859 list_add(&jh->list, &tmp);
860 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
861 } else {
862 reiserfs_free_jh(bh);
863 unlock_buffer(bh);
864 }
865 loop_next:
866 put_bh(bh);
867 cond_resched_lock(lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700869 if (chunk.nr) {
870 spin_unlock(lock);
871 write_ordered_chunk(&chunk);
872 spin_lock(lock);
873 }
874 while (!list_empty(&tmp)) {
875 jh = JH_ENTRY(tmp.prev);
876 bh = jh->bh;
877 get_bh(bh);
878 reiserfs_free_jh(bh);
879
880 if (buffer_locked(bh)) {
881 spin_unlock(lock);
882 wait_on_buffer(bh);
883 spin_lock(lock);
884 }
885 if (!buffer_uptodate(bh)) {
886 ret = -EIO;
887 }
Chris Masond62b1b82006-02-01 03:06:47 -0800888 /* ugly interaction with invalidatepage here.
889 * reiserfs_invalidate_page will pin any buffer that has a valid
890 * journal head from an older transaction. If someone else sets
891 * our buffer dirty after we write it in the first loop, and
892 * then someone truncates the page away, nobody will ever write
893 * the buffer. We're safe if we write the page one last time
894 * after freeing the journal header.
895 */
896 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
897 spin_unlock(lock);
898 ll_rw_block(WRITE, 1, &bh);
899 spin_lock(lock);
900 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700901 put_bh(bh);
902 cond_resched_lock(lock);
903 }
904 spin_unlock(lock);
905 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700907
908static int flush_older_commits(struct super_block *s,
909 struct reiserfs_journal_list *jl)
910{
911 struct reiserfs_journal *journal = SB_JOURNAL(s);
912 struct reiserfs_journal_list *other_jl;
913 struct reiserfs_journal_list *first_jl;
914 struct list_head *entry;
915 unsigned long trans_id = jl->j_trans_id;
916 unsigned long other_trans_id;
917 unsigned long first_trans_id;
918
919 find_first:
920 /*
921 * first we walk backwards to find the oldest uncommitted transation
922 */
923 first_jl = jl;
924 entry = jl->j_list.prev;
925 while (1) {
926 other_jl = JOURNAL_LIST_ENTRY(entry);
927 if (entry == &journal->j_journal_list ||
928 atomic_read(&other_jl->j_older_commits_done))
929 break;
930
931 first_jl = other_jl;
932 entry = other_jl->j_list.prev;
933 }
934
935 /* if we didn't find any older uncommitted transactions, return now */
936 if (first_jl == jl) {
937 return 0;
938 }
939
940 first_trans_id = first_jl->j_trans_id;
941
942 entry = &first_jl->j_list;
943 while (1) {
944 other_jl = JOURNAL_LIST_ENTRY(entry);
945 other_trans_id = other_jl->j_trans_id;
946
947 if (other_trans_id < trans_id) {
948 if (atomic_read(&other_jl->j_commit_left) != 0) {
949 flush_commit_list(s, other_jl, 0);
950
951 /* list we were called with is gone, return */
952 if (!journal_list_still_alive(s, trans_id))
953 return 1;
954
955 /* the one we just flushed is gone, this means all
956 * older lists are also gone, so first_jl is no longer
957 * valid either. Go back to the beginning.
958 */
959 if (!journal_list_still_alive
960 (s, other_trans_id)) {
961 goto find_first;
962 }
963 }
964 entry = entry->next;
965 if (entry == &journal->j_journal_list)
966 return 0;
967 } else {
968 return 0;
969 }
970 }
971 return 0;
972}
973int reiserfs_async_progress_wait(struct super_block *s)
974{
975 DEFINE_WAIT(wait);
976 struct reiserfs_journal *j = SB_JOURNAL(s);
977 if (atomic_read(&j->j_async_throttle))
978 blk_congestion_wait(WRITE, HZ / 10);
979 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980}
981
982/*
983** if this journal list still has commit blocks unflushed, send them to disk.
984**
985** log areas must be flushed in order (transaction 2 can't commit before transaction 1)
986** Before the commit block can by written, every other log block must be safely on disk
987**
988*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700989static int flush_commit_list(struct super_block *s,
990 struct reiserfs_journal_list *jl, int flushall)
991{
992 int i;
993 int bn;
994 struct buffer_head *tbh = NULL;
995 unsigned long trans_id = jl->j_trans_id;
996 struct reiserfs_journal *journal = SB_JOURNAL(s);
997 int barrier = 0;
998 int retval = 0;
Chris Masone0e851c2006-02-01 03:06:49 -0800999 int write_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001001 reiserfs_check_lock_depth(s, "flush_commit_list");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001003 if (atomic_read(&jl->j_older_commits_done)) {
1004 return 0;
1005 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001007 get_fs_excl();
Jens Axboe22e2c502005-06-27 10:55:12 +02001008
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001009 /* before we can put our commit blocks on disk, we have to make sure everyone older than
1010 ** us is on disk too
1011 */
1012 BUG_ON(jl->j_len <= 0);
1013 BUG_ON(trans_id == journal->j_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001015 get_journal_list(jl);
1016 if (flushall) {
1017 if (flush_older_commits(s, jl) == 1) {
1018 /* list disappeared during flush_older_commits. return */
1019 goto put_jl;
1020 }
1021 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001023 /* make sure nobody is trying to flush this one at the same time */
1024 down(&jl->j_commit_lock);
1025 if (!journal_list_still_alive(s, trans_id)) {
1026 up(&jl->j_commit_lock);
1027 goto put_jl;
1028 }
1029 BUG_ON(jl->j_trans_id == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001031 /* this commit is done, exit */
1032 if (atomic_read(&(jl->j_commit_left)) <= 0) {
1033 if (flushall) {
1034 atomic_set(&(jl->j_older_commits_done), 1);
1035 }
1036 up(&jl->j_commit_lock);
1037 goto put_jl;
1038 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001040 if (!list_empty(&jl->j_bh_list)) {
Chris Mason3d4492f2006-02-01 03:06:49 -08001041 int ret;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001042 unlock_kernel();
Chris Mason3d4492f2006-02-01 03:06:49 -08001043 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1044 journal, jl, &jl->j_bh_list);
1045 if (ret < 0 && retval == 0)
1046 retval = ret;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001047 lock_kernel();
1048 }
1049 BUG_ON(!list_empty(&jl->j_bh_list));
1050 /*
1051 * for the description block and all the log blocks, submit any buffers
Chris Masone0e851c2006-02-01 03:06:49 -08001052 * that haven't already reached the disk. Try to write at least 256
1053 * log blocks. later on, we will only wait on blocks that correspond
1054 * to this transaction, but while we're unplugging we might as well
1055 * get a chunk of data on there.
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001056 */
1057 atomic_inc(&journal->j_async_throttle);
Chris Masone0e851c2006-02-01 03:06:49 -08001058 write_len = jl->j_len + 1;
1059 if (write_len < 256)
1060 write_len = 256;
1061 for (i = 0 ; i < write_len ; i++) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001062 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1063 SB_ONDISK_JOURNAL_SIZE(s);
1064 tbh = journal_find_get_block(s, bn);
Chris Masone0e851c2006-02-01 03:06:49 -08001065 if (tbh) {
1066 if (buffer_dirty(tbh))
1067 ll_rw_block(WRITE, 1, &tbh) ;
1068 put_bh(tbh) ;
1069 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001070 }
1071 atomic_dec(&journal->j_async_throttle);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072
Jeff Mahoney5d5e81562005-12-14 14:38:36 -05001073 /* We're skipping the commit if there's an error */
1074 if (retval || reiserfs_is_journal_aborted(journal))
1075 barrier = 0;
1076
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001077 /* wait on everything written so far before writing the commit
1078 * if we are in barrier mode, send the commit down now
1079 */
1080 barrier = reiserfs_barrier_flush(s);
1081 if (barrier) {
1082 int ret;
1083 lock_buffer(jl->j_commit_bh);
1084 ret = submit_barrier_buffer(jl->j_commit_bh);
1085 if (ret == -EOPNOTSUPP) {
1086 set_buffer_uptodate(jl->j_commit_bh);
1087 disable_barrier(s);
1088 barrier = 0;
1089 }
1090 }
1091 for (i = 0; i < (jl->j_len + 1); i++) {
1092 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1093 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1094 tbh = journal_find_get_block(s, bn);
1095 wait_on_buffer(tbh);
1096 // since we're using ll_rw_blk above, it might have skipped over
1097 // a locked buffer. Double check here
1098 //
1099 if (buffer_dirty(tbh)) /* redundant, sync_dirty_buffer() checks */
1100 sync_dirty_buffer(tbh);
1101 if (unlikely(!buffer_uptodate(tbh))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001103 reiserfs_warning(s, "journal-601, buffer write failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001105 retval = -EIO;
1106 }
1107 put_bh(tbh); /* once for journal_find_get_block */
1108 put_bh(tbh); /* once due to original getblk in do_journal_end */
1109 atomic_dec(&(jl->j_commit_left));
1110 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001112 BUG_ON(atomic_read(&(jl->j_commit_left)) != 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001114 if (!barrier) {
Jeff Mahoney5d5e81562005-12-14 14:38:36 -05001115 /* If there was a write error in the journal - we can't commit
1116 * this transaction - it will be invalid and, if successful,
1117 * will just end up propogating the write error out to
1118 * the file system. */
1119 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1120 if (buffer_dirty(jl->j_commit_bh))
1121 BUG();
1122 mark_buffer_dirty(jl->j_commit_bh) ;
1123 sync_dirty_buffer(jl->j_commit_bh) ;
1124 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001125 } else
1126 wait_on_buffer(jl->j_commit_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001128 check_barrier_completion(s, jl->j_commit_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001130 /* If there was a write error in the journal - we can't commit this
1131 * transaction - it will be invalid and, if successful, will just end
1132 * up propogating the write error out to the filesystem. */
1133 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001135 reiserfs_warning(s, "journal-615: buffer write failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001137 retval = -EIO;
1138 }
1139 bforget(jl->j_commit_bh);
1140 if (journal->j_last_commit_id != 0 &&
1141 (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1142 reiserfs_warning(s, "clm-2200: last commit %lu, current %lu",
1143 journal->j_last_commit_id, jl->j_trans_id);
1144 }
1145 journal->j_last_commit_id = jl->j_trans_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001147 /* now, every commit block is on the disk. It is safe to allow blocks freed during this transaction to be reallocated */
1148 cleanup_freed_for_journal_list(s, jl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001150 retval = retval ? retval : journal->j_errno;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001152 /* mark the metadata dirty */
1153 if (!retval)
1154 dirty_one_transaction(s, jl);
1155 atomic_dec(&(jl->j_commit_left));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001157 if (flushall) {
1158 atomic_set(&(jl->j_older_commits_done), 1);
1159 }
1160 up(&jl->j_commit_lock);
1161 put_jl:
1162 put_journal_list(s, jl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001164 if (retval)
1165 reiserfs_abort(s, retval, "Journal write error in %s",
1166 __FUNCTION__);
1167 put_fs_excl();
1168 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169}
1170
1171/*
1172** flush_journal_list frequently needs to find a newer transaction for a given block. This does that, or
1173** returns NULL if it can't find anything
1174*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001175static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1176 reiserfs_journal_cnode
1177 *cn)
1178{
1179 struct super_block *sb = cn->sb;
1180 b_blocknr_t blocknr = cn->blocknr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001182 cn = cn->hprev;
1183 while (cn) {
1184 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1185 return cn->jlist;
1186 }
1187 cn = cn->hprev;
1188 }
1189 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190}
1191
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001192static void remove_journal_hash(struct super_block *,
1193 struct reiserfs_journal_cnode **,
1194 struct reiserfs_journal_list *, unsigned long,
1195 int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196
1197/*
1198** once all the real blocks have been flushed, it is safe to remove them from the
1199** journal list for this transaction. Aside from freeing the cnode, this also allows the
1200** block to be reallocated for data blocks if it had been deleted.
1201*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001202static void remove_all_from_journal_list(struct super_block *p_s_sb,
1203 struct reiserfs_journal_list *jl,
1204 int debug)
1205{
1206 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
1207 struct reiserfs_journal_cnode *cn, *last;
1208 cn = jl->j_realblock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001210 /* which is better, to lock once around the whole loop, or
1211 ** to lock for each call to remove_journal_hash?
1212 */
1213 while (cn) {
1214 if (cn->blocknr != 0) {
1215 if (debug) {
1216 reiserfs_warning(p_s_sb,
1217 "block %u, bh is %d, state %ld",
1218 cn->blocknr, cn->bh ? 1 : 0,
1219 cn->state);
1220 }
1221 cn->state = 0;
1222 remove_journal_hash(p_s_sb, journal->j_list_hash_table,
1223 jl, cn->blocknr, 1);
1224 }
1225 last = cn;
1226 cn = cn->next;
1227 free_cnode(p_s_sb, last);
1228 }
1229 jl->j_realblock = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230}
1231
1232/*
1233** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block.
1234** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start
1235** releasing blocks in this transaction for reuse as data blocks.
1236** called by flush_journal_list, before it calls remove_all_from_journal_list
1237**
1238*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001239static int _update_journal_header_block(struct super_block *p_s_sb,
1240 unsigned long offset,
1241 unsigned long trans_id)
1242{
1243 struct reiserfs_journal_header *jh;
1244 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001246 if (reiserfs_is_journal_aborted(journal))
1247 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001249 if (trans_id >= journal->j_last_flush_trans_id) {
1250 if (buffer_locked((journal->j_header_bh))) {
1251 wait_on_buffer((journal->j_header_bh));
1252 if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001254 reiserfs_warning(p_s_sb,
1255 "journal-699: buffer write failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001257 return -EIO;
1258 }
1259 }
1260 journal->j_last_flush_trans_id = trans_id;
1261 journal->j_first_unflushed_offset = offset;
1262 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1263 b_data);
1264 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1265 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1266 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001268 if (reiserfs_barrier_flush(p_s_sb)) {
1269 int ret;
1270 lock_buffer(journal->j_header_bh);
1271 ret = submit_barrier_buffer(journal->j_header_bh);
1272 if (ret == -EOPNOTSUPP) {
1273 set_buffer_uptodate(journal->j_header_bh);
1274 disable_barrier(p_s_sb);
1275 goto sync;
1276 }
1277 wait_on_buffer(journal->j_header_bh);
1278 check_barrier_completion(p_s_sb, journal->j_header_bh);
1279 } else {
1280 sync:
1281 set_buffer_dirty(journal->j_header_bh);
1282 sync_dirty_buffer(journal->j_header_bh);
1283 }
1284 if (!buffer_uptodate(journal->j_header_bh)) {
1285 reiserfs_warning(p_s_sb,
1286 "journal-837: IO error during journal replay");
1287 return -EIO;
1288 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001290 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291}
1292
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001293static int update_journal_header_block(struct super_block *p_s_sb,
1294 unsigned long offset,
1295 unsigned long trans_id)
1296{
1297 return _update_journal_header_block(p_s_sb, offset, trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001299
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300/*
1301** flush any and all journal lists older than you are
1302** can only be called from flush_journal_list
1303*/
1304static int flush_older_journal_lists(struct super_block *p_s_sb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001305 struct reiserfs_journal_list *jl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001307 struct list_head *entry;
1308 struct reiserfs_journal_list *other_jl;
1309 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
1310 unsigned long trans_id = jl->j_trans_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001312 /* we know we are the only ones flushing things, no extra race
1313 * protection is required.
1314 */
1315 restart:
1316 entry = journal->j_journal_list.next;
1317 /* Did we wrap? */
1318 if (entry == &journal->j_journal_list)
1319 return 0;
1320 other_jl = JOURNAL_LIST_ENTRY(entry);
1321 if (other_jl->j_trans_id < trans_id) {
1322 BUG_ON(other_jl->j_refcount <= 0);
1323 /* do not flush all */
1324 flush_journal_list(p_s_sb, other_jl, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001326 /* other_jl is now deleted from the list */
1327 goto restart;
1328 }
1329 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330}
1331
1332static void del_from_work_list(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001333 struct reiserfs_journal_list *jl)
1334{
1335 struct reiserfs_journal *journal = SB_JOURNAL(s);
1336 if (!list_empty(&jl->j_working_list)) {
1337 list_del_init(&jl->j_working_list);
1338 journal->j_num_work_lists--;
1339 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340}
1341
1342/* flush a journal list, both commit and real blocks
1343**
1344** always set flushall to 1, unless you are calling from inside
1345** flush_journal_list
1346**
1347** IMPORTANT. This can only be called while there are no journal writers,
1348** and the journal is locked. That means it can only be called from
1349** do_journal_end, or by journal_release
1350*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001351static int flush_journal_list(struct super_block *s,
1352 struct reiserfs_journal_list *jl, int flushall)
1353{
1354 struct reiserfs_journal_list *pjl;
1355 struct reiserfs_journal_cnode *cn, *last;
1356 int count;
1357 int was_jwait = 0;
1358 int was_dirty = 0;
1359 struct buffer_head *saved_bh;
1360 unsigned long j_len_saved = jl->j_len;
1361 struct reiserfs_journal *journal = SB_JOURNAL(s);
1362 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001364 BUG_ON(j_len_saved <= 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001366 if (atomic_read(&journal->j_wcount) != 0) {
1367 reiserfs_warning(s,
1368 "clm-2048: flush_journal_list called with wcount %d",
1369 atomic_read(&journal->j_wcount));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001371 BUG_ON(jl->j_trans_id == 0);
1372
1373 /* if flushall == 0, the lock is already held */
1374 if (flushall) {
1375 down(&journal->j_flush_sem);
1376 } else if (!down_trylock(&journal->j_flush_sem)) {
1377 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001379
1380 count = 0;
1381 if (j_len_saved > journal->j_trans_max) {
1382 reiserfs_panic(s,
1383 "journal-715: flush_journal_list, length is %lu, trans id %lu\n",
1384 j_len_saved, jl->j_trans_id);
1385 return 0;
1386 }
1387
1388 get_fs_excl();
1389
1390 /* if all the work is already done, get out of here */
1391 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1392 atomic_read(&(jl->j_commit_left)) <= 0) {
1393 goto flush_older_and_return;
1394 }
1395
1396 /* start by putting the commit list on disk. This will also flush
1397 ** the commit lists of any olders transactions
1398 */
1399 flush_commit_list(s, jl, 1);
1400
1401 if (!(jl->j_state & LIST_DIRTY)
1402 && !reiserfs_is_journal_aborted(journal))
1403 BUG();
1404
1405 /* are we done now? */
1406 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1407 atomic_read(&(jl->j_commit_left)) <= 0) {
1408 goto flush_older_and_return;
1409 }
1410
1411 /* loop through each cnode, see if we need to write it,
1412 ** or wait on a more recent transaction, or just ignore it
1413 */
1414 if (atomic_read(&(journal->j_wcount)) != 0) {
1415 reiserfs_panic(s,
1416 "journal-844: panic journal list is flushing, wcount is not 0\n");
1417 }
1418 cn = jl->j_realblock;
1419 while (cn) {
1420 was_jwait = 0;
1421 was_dirty = 0;
1422 saved_bh = NULL;
1423 /* blocknr of 0 is no longer in the hash, ignore it */
1424 if (cn->blocknr == 0) {
1425 goto free_cnode;
1426 }
1427
1428 /* This transaction failed commit. Don't write out to the disk */
1429 if (!(jl->j_state & LIST_DIRTY))
1430 goto free_cnode;
1431
1432 pjl = find_newer_jl_for_cn(cn);
1433 /* the order is important here. We check pjl to make sure we
1434 ** don't clear BH_JDirty_wait if we aren't the one writing this
1435 ** block to disk
1436 */
1437 if (!pjl && cn->bh) {
1438 saved_bh = cn->bh;
1439
1440 /* we do this to make sure nobody releases the buffer while
1441 ** we are working with it
1442 */
1443 get_bh(saved_bh);
1444
1445 if (buffer_journal_dirty(saved_bh)) {
1446 BUG_ON(!can_dirty(cn));
1447 was_jwait = 1;
1448 was_dirty = 1;
1449 } else if (can_dirty(cn)) {
1450 /* everything with !pjl && jwait should be writable */
1451 BUG();
1452 }
1453 }
1454
1455 /* if someone has this block in a newer transaction, just make
1456 ** sure they are commited, and don't try writing it to disk
1457 */
1458 if (pjl) {
1459 if (atomic_read(&pjl->j_commit_left))
1460 flush_commit_list(s, pjl, 1);
1461 goto free_cnode;
1462 }
1463
1464 /* bh == NULL when the block got to disk on its own, OR,
1465 ** the block got freed in a future transaction
1466 */
1467 if (saved_bh == NULL) {
1468 goto free_cnode;
1469 }
1470
1471 /* this should never happen. kupdate_one_transaction has this list
1472 ** locked while it works, so we should never see a buffer here that
1473 ** is not marked JDirty_wait
1474 */
1475 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1476 reiserfs_warning(s,
1477 "journal-813: BAD! buffer %llu %cdirty %cjwait, "
1478 "not in a newer tranasction",
1479 (unsigned long long)saved_bh->
1480 b_blocknr, was_dirty ? ' ' : '!',
1481 was_jwait ? ' ' : '!');
1482 }
1483 if (was_dirty) {
1484 /* we inc again because saved_bh gets decremented at free_cnode */
1485 get_bh(saved_bh);
1486 set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1487 lock_buffer(saved_bh);
1488 BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1489 if (buffer_dirty(saved_bh))
1490 submit_logged_buffer(saved_bh);
1491 else
1492 unlock_buffer(saved_bh);
1493 count++;
1494 } else {
1495 reiserfs_warning(s,
1496 "clm-2082: Unable to flush buffer %llu in %s",
1497 (unsigned long long)saved_bh->
1498 b_blocknr, __FUNCTION__);
1499 }
1500 free_cnode:
1501 last = cn;
1502 cn = cn->next;
1503 if (saved_bh) {
1504 /* we incremented this to keep others from taking the buffer head away */
1505 put_bh(saved_bh);
1506 if (atomic_read(&(saved_bh->b_count)) < 0) {
1507 reiserfs_warning(s,
1508 "journal-945: saved_bh->b_count < 0");
1509 }
1510 }
1511 }
1512 if (count > 0) {
1513 cn = jl->j_realblock;
1514 while (cn) {
1515 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1516 if (!cn->bh) {
1517 reiserfs_panic(s,
1518 "journal-1011: cn->bh is NULL\n");
1519 }
1520 wait_on_buffer(cn->bh);
1521 if (!cn->bh) {
1522 reiserfs_panic(s,
1523 "journal-1012: cn->bh is NULL\n");
1524 }
1525 if (unlikely(!buffer_uptodate(cn->bh))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001527 reiserfs_warning(s,
1528 "journal-949: buffer write failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001530 err = -EIO;
1531 }
1532 /* note, we must clear the JDirty_wait bit after the up to date
1533 ** check, otherwise we race against our flushpage routine
1534 */
1535 BUG_ON(!test_clear_buffer_journal_dirty
1536 (cn->bh));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001538 /* undo the inc from journal_mark_dirty */
1539 put_bh(cn->bh);
1540 brelse(cn->bh);
1541 }
1542 cn = cn->next;
1543 }
1544 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001546 if (err)
1547 reiserfs_abort(s, -EIO,
1548 "Write error while pushing transaction to disk in %s",
1549 __FUNCTION__);
1550 flush_older_and_return:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001552 /* before we can update the journal header block, we _must_ flush all
1553 ** real blocks from all older transactions to disk. This is because
1554 ** once the header block is updated, this transaction will not be
1555 ** replayed after a crash
1556 */
1557 if (flushall) {
1558 flush_older_journal_lists(s, jl);
1559 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001561 err = journal->j_errno;
1562 /* before we can remove everything from the hash tables for this
1563 ** transaction, we must make sure it can never be replayed
1564 **
1565 ** since we are only called from do_journal_end, we know for sure there
1566 ** are no allocations going on while we are flushing journal lists. So,
1567 ** we only need to update the journal header block for the last list
1568 ** being flushed
1569 */
1570 if (!err && flushall) {
1571 err =
1572 update_journal_header_block(s,
1573 (jl->j_start + jl->j_len +
1574 2) % SB_ONDISK_JOURNAL_SIZE(s),
1575 jl->j_trans_id);
1576 if (err)
1577 reiserfs_abort(s, -EIO,
1578 "Write error while updating journal header in %s",
1579 __FUNCTION__);
1580 }
1581 remove_all_from_journal_list(s, jl, 0);
1582 list_del_init(&jl->j_list);
1583 journal->j_num_lists--;
1584 del_from_work_list(s, jl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001586 if (journal->j_last_flush_id != 0 &&
1587 (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1588 reiserfs_warning(s, "clm-2201: last flush %lu, current %lu",
1589 journal->j_last_flush_id, jl->j_trans_id);
1590 }
1591 journal->j_last_flush_id = jl->j_trans_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001593 /* not strictly required since we are freeing the list, but it should
1594 * help find code using dead lists later on
1595 */
1596 jl->j_len = 0;
1597 atomic_set(&(jl->j_nonzerolen), 0);
1598 jl->j_start = 0;
1599 jl->j_realblock = NULL;
1600 jl->j_commit_bh = NULL;
1601 jl->j_trans_id = 0;
1602 jl->j_state = 0;
1603 put_journal_list(s, jl);
1604 if (flushall)
1605 up(&journal->j_flush_sem);
1606 put_fs_excl();
1607 return err;
1608}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609
1610static int write_one_transaction(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001611 struct reiserfs_journal_list *jl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612 struct buffer_chunk *chunk)
1613{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001614 struct reiserfs_journal_cnode *cn;
1615 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001617 jl->j_state |= LIST_TOUCHED;
1618 del_from_work_list(s, jl);
1619 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1620 return 0;
1621 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001623 cn = jl->j_realblock;
1624 while (cn) {
1625 /* if the blocknr == 0, this has been cleared from the hash,
1626 ** skip it
1627 */
1628 if (cn->blocknr == 0) {
1629 goto next;
1630 }
1631 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1632 struct buffer_head *tmp_bh;
1633 /* we can race against journal_mark_freed when we try
1634 * to lock_buffer(cn->bh), so we have to inc the buffer
1635 * count, and recheck things after locking
1636 */
1637 tmp_bh = cn->bh;
1638 get_bh(tmp_bh);
1639 lock_buffer(tmp_bh);
1640 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1641 if (!buffer_journal_dirty(tmp_bh) ||
1642 buffer_journal_prepared(tmp_bh))
1643 BUG();
1644 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1645 ret++;
1646 } else {
1647 /* note, cn->bh might be null now */
1648 unlock_buffer(tmp_bh);
1649 }
1650 put_bh(tmp_bh);
1651 }
1652 next:
1653 cn = cn->next;
1654 cond_resched();
1655 }
1656 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657}
1658
1659/* used by flush_commit_list */
1660static int dirty_one_transaction(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001661 struct reiserfs_journal_list *jl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001663 struct reiserfs_journal_cnode *cn;
1664 struct reiserfs_journal_list *pjl;
1665 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001667 jl->j_state |= LIST_DIRTY;
1668 cn = jl->j_realblock;
1669 while (cn) {
1670 /* look for a more recent transaction that logged this
1671 ** buffer. Only the most recent transaction with a buffer in
1672 ** it is allowed to send that buffer to disk
1673 */
1674 pjl = find_newer_jl_for_cn(cn);
1675 if (!pjl && cn->blocknr && cn->bh
1676 && buffer_journal_dirty(cn->bh)) {
1677 BUG_ON(!can_dirty(cn));
1678 /* if the buffer is prepared, it will either be logged
1679 * or restored. If restored, we need to make sure
1680 * it actually gets marked dirty
1681 */
1682 clear_buffer_journal_new(cn->bh);
1683 if (buffer_journal_prepared(cn->bh)) {
1684 set_buffer_journal_restore_dirty(cn->bh);
1685 } else {
1686 set_buffer_journal_test(cn->bh);
1687 mark_buffer_dirty(cn->bh);
1688 }
1689 }
1690 cn = cn->next;
1691 }
1692 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693}
1694
1695static int kupdate_transactions(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001696 struct reiserfs_journal_list *jl,
1697 struct reiserfs_journal_list **next_jl,
1698 unsigned long *next_trans_id,
1699 int num_blocks, int num_trans)
1700{
1701 int ret = 0;
1702 int written = 0;
1703 int transactions_flushed = 0;
1704 unsigned long orig_trans_id = jl->j_trans_id;
1705 struct buffer_chunk chunk;
1706 struct list_head *entry;
1707 struct reiserfs_journal *journal = SB_JOURNAL(s);
1708 chunk.nr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001710 down(&journal->j_flush_sem);
1711 if (!journal_list_still_alive(s, orig_trans_id)) {
1712 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001715 /* we've got j_flush_sem held, nobody is going to delete any
1716 * of these lists out from underneath us
1717 */
1718 while ((num_trans && transactions_flushed < num_trans) ||
1719 (!num_trans && written < num_blocks)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001721 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1722 atomic_read(&jl->j_commit_left)
1723 || !(jl->j_state & LIST_DIRTY)) {
1724 del_from_work_list(s, jl);
1725 break;
1726 }
1727 ret = write_one_transaction(s, jl, &chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001729 if (ret < 0)
1730 goto done;
1731 transactions_flushed++;
1732 written += ret;
1733 entry = jl->j_list.next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001735 /* did we wrap? */
1736 if (entry == &journal->j_journal_list) {
1737 break;
1738 }
1739 jl = JOURNAL_LIST_ENTRY(entry);
1740
1741 /* don't bother with older transactions */
1742 if (jl->j_trans_id <= orig_trans_id)
1743 break;
1744 }
1745 if (chunk.nr) {
1746 write_chunk(&chunk);
1747 }
1748
1749 done:
1750 up(&journal->j_flush_sem);
1751 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752}
1753
1754/* for o_sync and fsync heavy applications, they tend to use
1755** all the journa list slots with tiny transactions. These
1756** trigger lots and lots of calls to update the header block, which
1757** adds seeks and slows things down.
1758**
1759** This function tries to clear out a large chunk of the journal lists
1760** at once, which makes everything faster since only the newest journal
1761** list updates the header block
1762*/
1763static int flush_used_journal_lists(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001764 struct reiserfs_journal_list *jl)
1765{
1766 unsigned long len = 0;
1767 unsigned long cur_len;
1768 int ret;
1769 int i;
1770 int limit = 256;
1771 struct reiserfs_journal_list *tjl;
1772 struct reiserfs_journal_list *flush_jl;
1773 unsigned long trans_id;
1774 struct reiserfs_journal *journal = SB_JOURNAL(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001775
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001776 flush_jl = tjl = jl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001778 /* in data logging mode, try harder to flush a lot of blocks */
1779 if (reiserfs_data_log(s))
1780 limit = 1024;
1781 /* flush for 256 transactions or limit blocks, whichever comes first */
1782 for (i = 0; i < 256 && len < limit; i++) {
1783 if (atomic_read(&tjl->j_commit_left) ||
1784 tjl->j_trans_id < jl->j_trans_id) {
1785 break;
1786 }
1787 cur_len = atomic_read(&tjl->j_nonzerolen);
1788 if (cur_len > 0) {
1789 tjl->j_state &= ~LIST_TOUCHED;
1790 }
1791 len += cur_len;
1792 flush_jl = tjl;
1793 if (tjl->j_list.next == &journal->j_journal_list)
1794 break;
1795 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001797 /* try to find a group of blocks we can flush across all the
1798 ** transactions, but only bother if we've actually spanned
1799 ** across multiple lists
1800 */
1801 if (flush_jl != jl) {
1802 ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001804 flush_journal_list(s, flush_jl, 1);
1805 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806}
1807
1808/*
1809** removes any nodes in table with name block and dev as bh.
1810** only touchs the hnext and hprev pointers.
1811*/
1812void remove_journal_hash(struct super_block *sb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001813 struct reiserfs_journal_cnode **table,
1814 struct reiserfs_journal_list *jl,
1815 unsigned long block, int remove_freed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001817 struct reiserfs_journal_cnode *cur;
1818 struct reiserfs_journal_cnode **head;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001820 head = &(journal_hash(table, sb, block));
1821 if (!head) {
1822 return;
1823 }
1824 cur = *head;
1825 while (cur) {
1826 if (cur->blocknr == block && cur->sb == sb
1827 && (jl == NULL || jl == cur->jlist)
1828 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1829 if (cur->hnext) {
1830 cur->hnext->hprev = cur->hprev;
1831 }
1832 if (cur->hprev) {
1833 cur->hprev->hnext = cur->hnext;
1834 } else {
1835 *head = cur->hnext;
1836 }
1837 cur->blocknr = 0;
1838 cur->sb = NULL;
1839 cur->state = 0;
1840 if (cur->bh && cur->jlist) /* anybody who clears the cur->bh will also dec the nonzerolen */
1841 atomic_dec(&(cur->jlist->j_nonzerolen));
1842 cur->bh = NULL;
1843 cur->jlist = NULL;
1844 }
1845 cur = cur->hnext;
1846 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847}
1848
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001849static void free_journal_ram(struct super_block *p_s_sb)
1850{
1851 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
Pekka Enbergd739b422006-02-01 03:06:43 -08001852 kfree(journal->j_current_jl);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001853 journal->j_num_lists--;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001855 vfree(journal->j_cnode_free_orig);
1856 free_list_bitmaps(p_s_sb, journal->j_list_bitmap);
1857 free_bitmap_nodes(p_s_sb); /* must be after free_list_bitmaps */
1858 if (journal->j_header_bh) {
1859 brelse(journal->j_header_bh);
1860 }
1861 /* j_header_bh is on the journal dev, make sure not to release the journal
1862 * dev until we brelse j_header_bh
1863 */
1864 release_journal_dev(p_s_sb, journal);
1865 vfree(journal);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866}
1867
1868/*
1869** call on unmount. Only set error to 1 if you haven't made your way out
1870** of read_super() yet. Any other caller must keep error at 0.
1871*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001872static int do_journal_release(struct reiserfs_transaction_handle *th,
1873 struct super_block *p_s_sb, int error)
1874{
1875 struct reiserfs_transaction_handle myth;
1876 int flushed = 0;
1877 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001879 /* we only want to flush out transactions if we were called with error == 0
1880 */
1881 if (!error && !(p_s_sb->s_flags & MS_RDONLY)) {
1882 /* end the current trans */
1883 BUG_ON(!th->t_trans_id);
1884 do_journal_end(th, p_s_sb, 10, FLUSH_ALL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001886 /* make sure something gets logged to force our way into the flush code */
1887 if (!journal_join(&myth, p_s_sb, 1)) {
1888 reiserfs_prepare_for_journal(p_s_sb,
1889 SB_BUFFER_WITH_SB(p_s_sb),
1890 1);
1891 journal_mark_dirty(&myth, p_s_sb,
1892 SB_BUFFER_WITH_SB(p_s_sb));
1893 do_journal_end(&myth, p_s_sb, 1, FLUSH_ALL);
1894 flushed = 1;
1895 }
1896 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001898 /* this also catches errors during the do_journal_end above */
1899 if (!error && reiserfs_is_journal_aborted(journal)) {
1900 memset(&myth, 0, sizeof(myth));
1901 if (!journal_join_abort(&myth, p_s_sb, 1)) {
1902 reiserfs_prepare_for_journal(p_s_sb,
1903 SB_BUFFER_WITH_SB(p_s_sb),
1904 1);
1905 journal_mark_dirty(&myth, p_s_sb,
1906 SB_BUFFER_WITH_SB(p_s_sb));
1907 do_journal_end(&myth, p_s_sb, 1, FLUSH_ALL);
1908 }
1909 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001911 reiserfs_mounted_fs_count--;
1912 /* wait for all commits to finish */
1913 cancel_delayed_work(&SB_JOURNAL(p_s_sb)->j_work);
1914 flush_workqueue(commit_wq);
1915 if (!reiserfs_mounted_fs_count) {
1916 destroy_workqueue(commit_wq);
1917 commit_wq = NULL;
1918 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001920 free_journal_ram(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001922 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923}
1924
1925/*
1926** call on unmount. flush all journal trans, release all alloc'd ram
1927*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001928int journal_release(struct reiserfs_transaction_handle *th,
1929 struct super_block *p_s_sb)
1930{
1931 return do_journal_release(th, p_s_sb, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001933
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934/*
1935** only call from an error condition inside reiserfs_read_super!
1936*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001937int journal_release_error(struct reiserfs_transaction_handle *th,
1938 struct super_block *p_s_sb)
1939{
1940 return do_journal_release(th, p_s_sb, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941}
1942
1943/* compares description block with commit block. returns 1 if they differ, 0 if they are the same */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001944static int journal_compare_desc_commit(struct super_block *p_s_sb,
1945 struct reiserfs_journal_desc *desc,
1946 struct reiserfs_journal_commit *commit)
1947{
1948 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1949 get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1950 get_commit_trans_len(commit) > SB_JOURNAL(p_s_sb)->j_trans_max ||
1951 get_commit_trans_len(commit) <= 0) {
1952 return 1;
1953 }
1954 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001955}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001956
Linus Torvalds1da177e2005-04-16 15:20:36 -07001957/* returns 0 if it did not find a description block
1958** returns -1 if it found a corrupt commit block
1959** returns 1 if both desc and commit were valid
1960*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001961static int journal_transaction_is_valid(struct super_block *p_s_sb,
1962 struct buffer_head *d_bh,
1963 unsigned long *oldest_invalid_trans_id,
1964 unsigned long *newest_mount_id)
1965{
1966 struct reiserfs_journal_desc *desc;
1967 struct reiserfs_journal_commit *commit;
1968 struct buffer_head *c_bh;
1969 unsigned long offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001970
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001971 if (!d_bh)
1972 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001973
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001974 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
1975 if (get_desc_trans_len(desc) > 0
1976 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
1977 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
1978 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
1979 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
1980 "journal-986: transaction "
1981 "is valid returning because trans_id %d is greater than "
1982 "oldest_invalid %lu",
1983 get_desc_trans_id(desc),
1984 *oldest_invalid_trans_id);
1985 return 0;
1986 }
1987 if (newest_mount_id
1988 && *newest_mount_id > get_desc_mount_id(desc)) {
1989 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
1990 "journal-1087: transaction "
1991 "is valid returning because mount_id %d is less than "
1992 "newest_mount_id %lu",
1993 get_desc_mount_id(desc),
1994 *newest_mount_id);
1995 return -1;
1996 }
1997 if (get_desc_trans_len(desc) > SB_JOURNAL(p_s_sb)->j_trans_max) {
1998 reiserfs_warning(p_s_sb,
1999 "journal-2018: Bad transaction length %d encountered, ignoring transaction",
2000 get_desc_trans_len(desc));
2001 return -1;
2002 }
2003 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002004
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002005 /* ok, we have a journal description block, lets see if the transaction was valid */
2006 c_bh =
2007 journal_bread(p_s_sb,
2008 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2009 ((offset + get_desc_trans_len(desc) +
2010 1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
2011 if (!c_bh)
2012 return 0;
2013 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2014 if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
2015 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2016 "journal_transaction_is_valid, commit offset %ld had bad "
2017 "time %d or length %d",
2018 c_bh->b_blocknr -
2019 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2020 get_commit_trans_id(commit),
2021 get_commit_trans_len(commit));
2022 brelse(c_bh);
2023 if (oldest_invalid_trans_id) {
2024 *oldest_invalid_trans_id =
2025 get_desc_trans_id(desc);
2026 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2027 "journal-1004: "
2028 "transaction_is_valid setting oldest invalid trans_id "
2029 "to %d",
2030 get_desc_trans_id(desc));
2031 }
2032 return -1;
2033 }
2034 brelse(c_bh);
2035 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2036 "journal-1006: found valid "
2037 "transaction start offset %llu, len %d id %d",
2038 d_bh->b_blocknr -
2039 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2040 get_desc_trans_len(desc),
2041 get_desc_trans_id(desc));
2042 return 1;
2043 } else {
2044 return 0;
2045 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002046}
2047
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002048static void brelse_array(struct buffer_head **heads, int num)
2049{
2050 int i;
2051 for (i = 0; i < num; i++) {
2052 brelse(heads[i]);
2053 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002054}
2055
2056/*
2057** given the start, and values for the oldest acceptable transactions,
2058** this either reads in a replays a transaction, or returns because the transaction
2059** is invalid, or too old.
2060*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002061static int journal_read_transaction(struct super_block *p_s_sb,
2062 unsigned long cur_dblock,
2063 unsigned long oldest_start,
2064 unsigned long oldest_trans_id,
2065 unsigned long newest_mount_id)
2066{
2067 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
2068 struct reiserfs_journal_desc *desc;
2069 struct reiserfs_journal_commit *commit;
2070 unsigned long trans_id = 0;
2071 struct buffer_head *c_bh;
2072 struct buffer_head *d_bh;
2073 struct buffer_head **log_blocks = NULL;
2074 struct buffer_head **real_blocks = NULL;
2075 unsigned long trans_offset;
2076 int i;
2077 int trans_half;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002079 d_bh = journal_bread(p_s_sb, cur_dblock);
2080 if (!d_bh)
2081 return 1;
2082 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2083 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
2084 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1037: "
2085 "journal_read_transaction, offset %llu, len %d mount_id %d",
2086 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2087 get_desc_trans_len(desc), get_desc_mount_id(desc));
2088 if (get_desc_trans_id(desc) < oldest_trans_id) {
2089 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1039: "
2090 "journal_read_trans skipping because %lu is too old",
2091 cur_dblock -
2092 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb));
2093 brelse(d_bh);
2094 return 1;
2095 }
2096 if (get_desc_mount_id(desc) != newest_mount_id) {
2097 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1146: "
2098 "journal_read_trans skipping because %d is != "
2099 "newest_mount_id %lu", get_desc_mount_id(desc),
2100 newest_mount_id);
2101 brelse(d_bh);
2102 return 1;
2103 }
2104 c_bh = journal_bread(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2105 ((trans_offset + get_desc_trans_len(desc) + 1) %
2106 SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
2107 if (!c_bh) {
2108 brelse(d_bh);
2109 return 1;
2110 }
2111 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2112 if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
2113 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2114 "journal_read_transaction, "
2115 "commit offset %llu had bad time %d or length %d",
2116 c_bh->b_blocknr -
2117 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2118 get_commit_trans_id(commit),
2119 get_commit_trans_len(commit));
2120 brelse(c_bh);
2121 brelse(d_bh);
2122 return 1;
2123 }
2124 trans_id = get_desc_trans_id(desc);
2125 /* now we know we've got a good transaction, and it was inside the valid time ranges */
Pekka Enbergd739b422006-02-01 03:06:43 -08002126 log_blocks = kmalloc(get_desc_trans_len(desc) *
2127 sizeof(struct buffer_head *), GFP_NOFS);
2128 real_blocks = kmalloc(get_desc_trans_len(desc) *
2129 sizeof(struct buffer_head *), GFP_NOFS);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002130 if (!log_blocks || !real_blocks) {
2131 brelse(c_bh);
2132 brelse(d_bh);
Pekka Enbergd739b422006-02-01 03:06:43 -08002133 kfree(log_blocks);
2134 kfree(real_blocks);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002135 reiserfs_warning(p_s_sb,
2136 "journal-1169: kmalloc failed, unable to mount FS");
2137 return -1;
2138 }
2139 /* get all the buffer heads */
2140 trans_half = journal_trans_half(p_s_sb->s_blocksize);
2141 for (i = 0; i < get_desc_trans_len(desc); i++) {
2142 log_blocks[i] =
2143 journal_getblk(p_s_sb,
2144 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2145 (trans_offset + 1 +
2146 i) % SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2147 if (i < trans_half) {
2148 real_blocks[i] =
2149 sb_getblk(p_s_sb,
2150 le32_to_cpu(desc->j_realblock[i]));
2151 } else {
2152 real_blocks[i] =
2153 sb_getblk(p_s_sb,
2154 le32_to_cpu(commit->
2155 j_realblock[i - trans_half]));
2156 }
2157 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(p_s_sb)) {
2158 reiserfs_warning(p_s_sb,
2159 "journal-1207: REPLAY FAILURE fsck required! Block to replay is outside of filesystem");
2160 goto abort_replay;
2161 }
2162 /* make sure we don't try to replay onto log or reserved area */
2163 if (is_block_in_log_or_reserved_area
2164 (p_s_sb, real_blocks[i]->b_blocknr)) {
2165 reiserfs_warning(p_s_sb,
2166 "journal-1204: REPLAY FAILURE fsck required! Trying to replay onto a log block");
2167 abort_replay:
2168 brelse_array(log_blocks, i);
2169 brelse_array(real_blocks, i);
2170 brelse(c_bh);
2171 brelse(d_bh);
Pekka Enbergd739b422006-02-01 03:06:43 -08002172 kfree(log_blocks);
2173 kfree(real_blocks);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002174 return -1;
2175 }
2176 }
2177 /* read in the log blocks, memcpy to the corresponding real block */
2178 ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
2179 for (i = 0; i < get_desc_trans_len(desc); i++) {
2180 wait_on_buffer(log_blocks[i]);
2181 if (!buffer_uptodate(log_blocks[i])) {
2182 reiserfs_warning(p_s_sb,
2183 "journal-1212: REPLAY FAILURE fsck required! buffer write failed");
2184 brelse_array(log_blocks + i,
2185 get_desc_trans_len(desc) - i);
2186 brelse_array(real_blocks, get_desc_trans_len(desc));
2187 brelse(c_bh);
2188 brelse(d_bh);
Pekka Enbergd739b422006-02-01 03:06:43 -08002189 kfree(log_blocks);
2190 kfree(real_blocks);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002191 return -1;
2192 }
2193 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2194 real_blocks[i]->b_size);
2195 set_buffer_uptodate(real_blocks[i]);
2196 brelse(log_blocks[i]);
2197 }
2198 /* flush out the real blocks */
2199 for (i = 0; i < get_desc_trans_len(desc); i++) {
2200 set_buffer_dirty(real_blocks[i]);
Jan Kara53778ff2005-09-06 15:19:14 -07002201 ll_rw_block(SWRITE, 1, real_blocks + i);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002202 }
2203 for (i = 0; i < get_desc_trans_len(desc); i++) {
2204 wait_on_buffer(real_blocks[i]);
2205 if (!buffer_uptodate(real_blocks[i])) {
2206 reiserfs_warning(p_s_sb,
2207 "journal-1226: REPLAY FAILURE, fsck required! buffer write failed");
2208 brelse_array(real_blocks + i,
2209 get_desc_trans_len(desc) - i);
2210 brelse(c_bh);
2211 brelse(d_bh);
Pekka Enbergd739b422006-02-01 03:06:43 -08002212 kfree(log_blocks);
2213 kfree(real_blocks);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002214 return -1;
2215 }
2216 brelse(real_blocks[i]);
2217 }
2218 cur_dblock =
2219 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2220 ((trans_offset + get_desc_trans_len(desc) +
2221 2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2222 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2223 "journal-1095: setting journal " "start to offset %ld",
2224 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb));
2225
2226 /* init starting values for the first transaction, in case this is the last transaction to be replayed. */
2227 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
2228 journal->j_last_flush_trans_id = trans_id;
2229 journal->j_trans_id = trans_id + 1;
Alexander Zarochentseva44c94a2006-03-25 03:06:59 -08002230 /* check for trans_id overflow */
2231 if (journal->j_trans_id == 0)
2232 journal->j_trans_id = 10;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002233 brelse(c_bh);
2234 brelse(d_bh);
Pekka Enbergd739b422006-02-01 03:06:43 -08002235 kfree(log_blocks);
2236 kfree(real_blocks);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002237 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002238}
2239
2240/* This function reads blocks starting from block and to max_block of bufsize
2241 size (but no more than BUFNR blocks at a time). This proved to improve
2242 mounting speed on self-rebuilding raid5 arrays at least.
2243 Right now it is only used from journal code. But later we might use it
2244 from other places.
2245 Note: Do not use journal_getblk/sb_getblk functions here! */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002246static struct buffer_head *reiserfs_breada(struct block_device *dev, int block,
2247 int bufsize, unsigned int max_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002249 struct buffer_head *bhlist[BUFNR];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002250 unsigned int blocks = BUFNR;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002251 struct buffer_head *bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002252 int i, j;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002253
2254 bh = __getblk(dev, block, bufsize);
2255 if (buffer_uptodate(bh))
2256 return (bh);
2257
Linus Torvalds1da177e2005-04-16 15:20:36 -07002258 if (block + BUFNR > max_block) {
2259 blocks = max_block - block;
2260 }
2261 bhlist[0] = bh;
2262 j = 1;
2263 for (i = 1; i < blocks; i++) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002264 bh = __getblk(dev, block + i, bufsize);
2265 if (buffer_uptodate(bh)) {
2266 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002267 break;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002268 } else
2269 bhlist[j++] = bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002270 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002271 ll_rw_block(READ, j, bhlist);
2272 for (i = 1; i < j; i++)
2273 brelse(bhlist[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002274 bh = bhlist[0];
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002275 wait_on_buffer(bh);
2276 if (buffer_uptodate(bh))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002277 return bh;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002278 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002279 return NULL;
2280}
2281
2282/*
2283** read and replay the log
2284** on a clean unmount, the journal header's next unflushed pointer will be to an invalid
2285** transaction. This tests that before finding all the transactions in the log, which makes normal mount times fast.
2286**
2287** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid.
2288**
2289** On exit, it sets things up so the first transaction will work correctly.
2290*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002291static int journal_read(struct super_block *p_s_sb)
2292{
2293 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
2294 struct reiserfs_journal_desc *desc;
2295 unsigned long oldest_trans_id = 0;
2296 unsigned long oldest_invalid_trans_id = 0;
2297 time_t start;
2298 unsigned long oldest_start = 0;
2299 unsigned long cur_dblock = 0;
2300 unsigned long newest_mount_id = 9;
2301 struct buffer_head *d_bh;
2302 struct reiserfs_journal_header *jh;
2303 int valid_journal_header = 0;
2304 int replay_count = 0;
2305 int continue_replay = 1;
2306 int ret;
2307 char b[BDEVNAME_SIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002308
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002309 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
2310 reiserfs_info(p_s_sb, "checking transaction log (%s)\n",
2311 bdevname(journal->j_dev_bd, b));
2312 start = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002313
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002314 /* step 1, read in the journal header block. Check the transaction it says
2315 ** is the first unflushed, and if that transaction is not valid,
2316 ** replay is done
2317 */
2318 journal->j_header_bh = journal_bread(p_s_sb,
2319 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb)
2320 + SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2321 if (!journal->j_header_bh) {
2322 return 1;
2323 }
2324 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
Vladimir V. Savelievc499ec22006-03-02 02:54:39 -08002325 if (le32_to_cpu(jh->j_first_unflushed_offset) <
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002326 SB_ONDISK_JOURNAL_SIZE(p_s_sb)
2327 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2328 oldest_start =
2329 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2330 le32_to_cpu(jh->j_first_unflushed_offset);
2331 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2332 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2333 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2334 "journal-1153: found in "
2335 "header: first_unflushed_offset %d, last_flushed_trans_id "
2336 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2337 le32_to_cpu(jh->j_last_flush_trans_id));
2338 valid_journal_header = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002339
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002340 /* now, we try to read the first unflushed offset. If it is not valid,
2341 ** there is nothing more we can do, and it makes no sense to read
2342 ** through the whole log.
2343 */
2344 d_bh =
2345 journal_bread(p_s_sb,
2346 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2347 le32_to_cpu(jh->j_first_unflushed_offset));
2348 ret = journal_transaction_is_valid(p_s_sb, d_bh, NULL, NULL);
2349 if (!ret) {
2350 continue_replay = 0;
2351 }
2352 brelse(d_bh);
2353 goto start_log_replay;
2354 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002355
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002356 if (continue_replay && bdev_read_only(p_s_sb->s_bdev)) {
2357 reiserfs_warning(p_s_sb,
2358 "clm-2076: device is readonly, unable to replay log");
2359 return -1;
2360 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002361
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002362 /* ok, there are transactions that need to be replayed. start with the first log block, find
2363 ** all the valid transactions, and pick out the oldest.
2364 */
2365 while (continue_replay
2366 && cur_dblock <
2367 (SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2368 SB_ONDISK_JOURNAL_SIZE(p_s_sb))) {
2369 /* Note that it is required for blocksize of primary fs device and journal
2370 device to be the same */
2371 d_bh =
2372 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2373 p_s_sb->s_blocksize,
2374 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2375 SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2376 ret =
2377 journal_transaction_is_valid(p_s_sb, d_bh,
2378 &oldest_invalid_trans_id,
2379 &newest_mount_id);
2380 if (ret == 1) {
2381 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2382 if (oldest_start == 0) { /* init all oldest_ values */
2383 oldest_trans_id = get_desc_trans_id(desc);
2384 oldest_start = d_bh->b_blocknr;
2385 newest_mount_id = get_desc_mount_id(desc);
2386 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2387 "journal-1179: Setting "
2388 "oldest_start to offset %llu, trans_id %lu",
2389 oldest_start -
2390 SB_ONDISK_JOURNAL_1st_BLOCK
2391 (p_s_sb), oldest_trans_id);
2392 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2393 /* one we just read was older */
2394 oldest_trans_id = get_desc_trans_id(desc);
2395 oldest_start = d_bh->b_blocknr;
2396 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2397 "journal-1180: Resetting "
2398 "oldest_start to offset %lu, trans_id %lu",
2399 oldest_start -
2400 SB_ONDISK_JOURNAL_1st_BLOCK
2401 (p_s_sb), oldest_trans_id);
2402 }
2403 if (newest_mount_id < get_desc_mount_id(desc)) {
2404 newest_mount_id = get_desc_mount_id(desc);
2405 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2406 "journal-1299: Setting "
2407 "newest_mount_id to %d",
2408 get_desc_mount_id(desc));
2409 }
2410 cur_dblock += get_desc_trans_len(desc) + 2;
2411 } else {
2412 cur_dblock++;
2413 }
2414 brelse(d_bh);
2415 }
2416
2417 start_log_replay:
2418 cur_dblock = oldest_start;
2419 if (oldest_trans_id) {
2420 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2421 "journal-1206: Starting replay "
2422 "from offset %llu, trans_id %lu",
2423 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2424 oldest_trans_id);
2425
2426 }
2427 replay_count = 0;
2428 while (continue_replay && oldest_trans_id > 0) {
2429 ret =
2430 journal_read_transaction(p_s_sb, cur_dblock, oldest_start,
2431 oldest_trans_id, newest_mount_id);
2432 if (ret < 0) {
2433 return ret;
2434 } else if (ret != 0) {
2435 break;
2436 }
2437 cur_dblock =
2438 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + journal->j_start;
2439 replay_count++;
2440 if (cur_dblock == oldest_start)
2441 break;
2442 }
2443
2444 if (oldest_trans_id == 0) {
2445 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2446 "journal-1225: No valid " "transactions found");
2447 }
2448 /* j_start does not get set correctly if we don't replay any transactions.
2449 ** if we had a valid journal_header, set j_start to the first unflushed transaction value,
2450 ** copy the trans_id from the header
2451 */
2452 if (valid_journal_header && replay_count == 0) {
2453 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2454 journal->j_trans_id =
2455 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
Alexander Zarochentseva44c94a2006-03-25 03:06:59 -08002456 /* check for trans_id overflow */
2457 if (journal->j_trans_id == 0)
2458 journal->j_trans_id = 10;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002459 journal->j_last_flush_trans_id =
2460 le32_to_cpu(jh->j_last_flush_trans_id);
2461 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2462 } else {
2463 journal->j_mount_id = newest_mount_id + 1;
2464 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002465 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002466 "newest_mount_id to %lu", journal->j_mount_id);
2467 journal->j_first_unflushed_offset = journal->j_start;
2468 if (replay_count > 0) {
2469 reiserfs_info(p_s_sb,
2470 "replayed %d transactions in %lu seconds\n",
2471 replay_count, get_seconds() - start);
2472 }
2473 if (!bdev_read_only(p_s_sb->s_bdev) &&
2474 _update_journal_header_block(p_s_sb, journal->j_start,
2475 journal->j_last_flush_trans_id)) {
2476 /* replay failed, caller must call free_journal_ram and abort
2477 ** the mount
2478 */
2479 return -1;
2480 }
2481 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002482}
2483
2484static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2485{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002486 struct reiserfs_journal_list *jl;
Pekka Enberg8c777cc2006-02-01 03:06:43 -08002487 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2488 GFP_NOFS | __GFP_NOFAIL);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002489 INIT_LIST_HEAD(&jl->j_list);
2490 INIT_LIST_HEAD(&jl->j_working_list);
2491 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2492 INIT_LIST_HEAD(&jl->j_bh_list);
2493 sema_init(&jl->j_commit_lock, 1);
2494 SB_JOURNAL(s)->j_num_lists++;
2495 get_journal_list(jl);
2496 return jl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002497}
2498
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002499static void journal_list_init(struct super_block *p_s_sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002500{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002501 SB_JOURNAL(p_s_sb)->j_current_jl = alloc_journal_list(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002502}
2503
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002504static int release_journal_dev(struct super_block *super,
2505 struct reiserfs_journal *journal)
2506{
2507 int result;
2508
2509 result = 0;
2510
2511 if (journal->j_dev_file != NULL) {
2512 result = filp_close(journal->j_dev_file, NULL);
2513 journal->j_dev_file = NULL;
2514 journal->j_dev_bd = NULL;
2515 } else if (journal->j_dev_bd != NULL) {
2516 result = blkdev_put(journal->j_dev_bd);
2517 journal->j_dev_bd = NULL;
2518 }
2519
2520 if (result != 0) {
2521 reiserfs_warning(super,
2522 "sh-457: release_journal_dev: Cannot release journal device: %i",
2523 result);
2524 }
2525 return result;
2526}
2527
2528static int journal_init_dev(struct super_block *super,
2529 struct reiserfs_journal *journal,
2530 const char *jdev_name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002531{
2532 int result;
2533 dev_t jdev;
2534 int blkdev_mode = FMODE_READ | FMODE_WRITE;
2535 char b[BDEVNAME_SIZE];
2536
2537 result = 0;
2538
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002539 journal->j_dev_bd = NULL;
2540 journal->j_dev_file = NULL;
2541 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2542 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002543
2544 if (bdev_read_only(super->s_bdev))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002545 blkdev_mode = FMODE_READ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002546
2547 /* there is no "jdev" option and journal is on separate device */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002548 if ((!jdev_name || !jdev_name[0])) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002549 journal->j_dev_bd = open_by_devnum(jdev, blkdev_mode);
2550 if (IS_ERR(journal->j_dev_bd)) {
2551 result = PTR_ERR(journal->j_dev_bd);
2552 journal->j_dev_bd = NULL;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002553 reiserfs_warning(super, "sh-458: journal_init_dev: "
2554 "cannot init journal device '%s': %i",
2555 __bdevname(jdev, b), result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002556 return result;
2557 } else if (jdev != super->s_dev)
2558 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2559 return 0;
2560 }
2561
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002562 journal->j_dev_file = filp_open(jdev_name, 0, 0);
2563 if (!IS_ERR(journal->j_dev_file)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002564 struct inode *jdev_inode = journal->j_dev_file->f_mapping->host;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002565 if (!S_ISBLK(jdev_inode->i_mode)) {
Edward Shishkin74f9f972005-05-01 08:59:09 -07002566 reiserfs_warning(super, "journal_init_dev: '%s' is "
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002567 "not a block device", jdev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002568 result = -ENOTBLK;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002569 release_journal_dev(super, journal);
2570 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002571 /* ok */
2572 journal->j_dev_bd = I_BDEV(jdev_inode);
2573 set_blocksize(journal->j_dev_bd, super->s_blocksize);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002574 reiserfs_info(super,
2575 "journal_init_dev: journal device: %s\n",
Edward Shishkin74f9f972005-05-01 08:59:09 -07002576 bdevname(journal->j_dev_bd, b));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002577 }
2578 } else {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002579 result = PTR_ERR(journal->j_dev_file);
2580 journal->j_dev_file = NULL;
2581 reiserfs_warning(super,
2582 "journal_init_dev: Cannot open '%s': %i",
2583 jdev_name, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002584 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002585 return result;
2586}
2587
2588/*
2589** must be called once on fs mount. calls journal_read for you
2590*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002591int journal_init(struct super_block *p_s_sb, const char *j_dev_name,
2592 int old_format, unsigned int commit_max_age)
2593{
2594 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(p_s_sb) * 2;
2595 struct buffer_head *bhjh;
2596 struct reiserfs_super_block *rs;
2597 struct reiserfs_journal_header *jh;
2598 struct reiserfs_journal *journal;
2599 struct reiserfs_journal_list *jl;
2600 char b[BDEVNAME_SIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002601
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002602 journal = SB_JOURNAL(p_s_sb) = vmalloc(sizeof(struct reiserfs_journal));
2603 if (!journal) {
2604 reiserfs_warning(p_s_sb,
2605 "journal-1256: unable to get memory for journal structure");
2606 return 1;
2607 }
2608 memset(journal, 0, sizeof(struct reiserfs_journal));
2609 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2610 INIT_LIST_HEAD(&journal->j_prealloc_list);
2611 INIT_LIST_HEAD(&journal->j_working_list);
2612 INIT_LIST_HEAD(&journal->j_journal_list);
2613 journal->j_persistent_trans = 0;
2614 if (reiserfs_allocate_list_bitmaps(p_s_sb,
2615 journal->j_list_bitmap,
2616 SB_BMAP_NR(p_s_sb)))
2617 goto free_and_return;
2618 allocate_bitmap_nodes(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002619
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002620 /* reserved for journal area support */
2621 SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) = (old_format ?
2622 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2623 / p_s_sb->s_blocksize +
2624 SB_BMAP_NR(p_s_sb) +
2625 1 :
2626 REISERFS_DISK_OFFSET_IN_BYTES /
2627 p_s_sb->s_blocksize + 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002628
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002629 /* Sanity check to see is the standard journal fitting withing first bitmap
2630 (actual for small blocksizes) */
2631 if (!SB_ONDISK_JOURNAL_DEVICE(p_s_sb) &&
2632 (SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) +
2633 SB_ONDISK_JOURNAL_SIZE(p_s_sb) > p_s_sb->s_blocksize * 8)) {
2634 reiserfs_warning(p_s_sb,
2635 "journal-1393: journal does not fit for area "
2636 "addressed by first of bitmap blocks. It starts at "
2637 "%u and its size is %u. Block size %ld",
2638 SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb),
2639 SB_ONDISK_JOURNAL_SIZE(p_s_sb),
2640 p_s_sb->s_blocksize);
2641 goto free_and_return;
2642 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002643
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002644 if (journal_init_dev(p_s_sb, journal, j_dev_name) != 0) {
2645 reiserfs_warning(p_s_sb,
2646 "sh-462: unable to initialize jornal device");
2647 goto free_and_return;
2648 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002649
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002650 rs = SB_DISK_SUPER_BLOCK(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002651
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002652 /* read journal header */
2653 bhjh = journal_bread(p_s_sb,
2654 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2655 SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2656 if (!bhjh) {
2657 reiserfs_warning(p_s_sb,
2658 "sh-459: unable to read journal header");
2659 goto free_and_return;
2660 }
2661 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002662
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002663 /* make sure that journal matches to the super block */
2664 if (is_reiserfs_jr(rs)
2665 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2666 sb_jp_journal_magic(rs))) {
2667 reiserfs_warning(p_s_sb,
2668 "sh-460: journal header magic %x "
2669 "(device %s) does not match to magic found in super "
2670 "block %x", jh->jh_journal.jp_journal_magic,
2671 bdevname(journal->j_dev_bd, b),
2672 sb_jp_journal_magic(rs));
2673 brelse(bhjh);
2674 goto free_and_return;
2675 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002676
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002677 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2678 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2679 journal->j_max_commit_age =
2680 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2681 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002682
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002683 if (journal->j_trans_max) {
2684 /* make sure these parameters are available, assign it if they are not */
2685 __u32 initial = journal->j_trans_max;
2686 __u32 ratio = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002687
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002688 if (p_s_sb->s_blocksize < 4096)
2689 ratio = 4096 / p_s_sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002690
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002691 if (SB_ONDISK_JOURNAL_SIZE(p_s_sb) / journal->j_trans_max <
2692 JOURNAL_MIN_RATIO)
2693 journal->j_trans_max =
2694 SB_ONDISK_JOURNAL_SIZE(p_s_sb) / JOURNAL_MIN_RATIO;
2695 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio)
2696 journal->j_trans_max =
2697 JOURNAL_TRANS_MAX_DEFAULT / ratio;
2698 if (journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio)
2699 journal->j_trans_max =
2700 JOURNAL_TRANS_MIN_DEFAULT / ratio;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002701
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002702 if (journal->j_trans_max != initial)
2703 reiserfs_warning(p_s_sb,
2704 "sh-461: journal_init: wrong transaction max size (%u). Changed to %u",
2705 initial, journal->j_trans_max);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002706
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002707 journal->j_max_batch = journal->j_trans_max *
2708 JOURNAL_MAX_BATCH_DEFAULT / JOURNAL_TRANS_MAX_DEFAULT;
2709 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002710
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002711 if (!journal->j_trans_max) {
2712 /*we have the file system was created by old version of mkreiserfs
2713 so this field contains zero value */
2714 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2715 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2716 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002717
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002718 /* for blocksize >= 4096 - max transaction size is 1024. For block size < 4096
2719 trans max size is decreased proportionally */
2720 if (p_s_sb->s_blocksize < 4096) {
2721 journal->j_trans_max /= (4096 / p_s_sb->s_blocksize);
2722 journal->j_max_batch = (journal->j_trans_max) * 9 / 10;
2723 }
2724 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002725
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002726 journal->j_default_max_commit_age = journal->j_max_commit_age;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002727
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002728 if (commit_max_age != 0) {
2729 journal->j_max_commit_age = commit_max_age;
2730 journal->j_max_trans_age = commit_max_age;
2731 }
2732
2733 reiserfs_info(p_s_sb, "journal params: device %s, size %u, "
2734 "journal first block %u, max trans len %u, max batch %u, "
2735 "max commit age %u, max trans age %u\n",
2736 bdevname(journal->j_dev_bd, b),
2737 SB_ONDISK_JOURNAL_SIZE(p_s_sb),
2738 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2739 journal->j_trans_max,
2740 journal->j_max_batch,
2741 journal->j_max_commit_age, journal->j_max_trans_age);
2742
2743 brelse(bhjh);
2744
2745 journal->j_list_bitmap_index = 0;
2746 journal_list_init(p_s_sb);
2747
2748 memset(journal->j_list_hash_table, 0,
2749 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2750
2751 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2752 spin_lock_init(&journal->j_dirty_buffers_lock);
2753
2754 journal->j_start = 0;
2755 journal->j_len = 0;
2756 journal->j_len_alloc = 0;
2757 atomic_set(&(journal->j_wcount), 0);
2758 atomic_set(&(journal->j_async_throttle), 0);
2759 journal->j_bcount = 0;
2760 journal->j_trans_start_time = 0;
2761 journal->j_last = NULL;
2762 journal->j_first = NULL;
2763 init_waitqueue_head(&(journal->j_join_wait));
2764 sema_init(&journal->j_lock, 1);
2765 sema_init(&journal->j_flush_sem, 1);
2766
2767 journal->j_trans_id = 10;
2768 journal->j_mount_id = 10;
2769 journal->j_state = 0;
2770 atomic_set(&(journal->j_jlock), 0);
2771 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2772 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2773 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2774 journal->j_cnode_used = 0;
2775 journal->j_must_wait = 0;
2776
Jeff Mahoney576f6d72005-11-29 19:34:39 -08002777 if (journal->j_cnode_free == 0) {
2778 reiserfs_warning(p_s_sb, "journal-2004: Journal cnode memory "
2779 "allocation failed (%ld bytes). Journal is "
2780 "too large for available memory. Usually "
2781 "this is due to a journal that is too large.",
2782 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2783 goto free_and_return;
2784 }
2785
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002786 init_journal_hash(p_s_sb);
2787 jl = journal->j_current_jl;
2788 jl->j_list_bitmap = get_list_bitmap(p_s_sb, jl);
2789 if (!jl->j_list_bitmap) {
2790 reiserfs_warning(p_s_sb,
2791 "journal-2005, get_list_bitmap failed for journal list 0");
2792 goto free_and_return;
2793 }
2794 if (journal_read(p_s_sb) < 0) {
2795 reiserfs_warning(p_s_sb, "Replay Failure, unable to mount");
2796 goto free_and_return;
2797 }
2798
2799 reiserfs_mounted_fs_count++;
2800 if (reiserfs_mounted_fs_count <= 1)
2801 commit_wq = create_workqueue("reiserfs");
2802
2803 INIT_WORK(&journal->j_work, flush_async_commits, p_s_sb);
2804 return 0;
2805 free_and_return:
2806 free_journal_ram(p_s_sb);
2807 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002808}
2809
2810/*
2811** test for a polite end of the current transaction. Used by file_write, and should
2812** be used by delete to make sure they don't write more than can fit inside a single
2813** transaction
2814*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002815int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2816 int new_alloc)
2817{
2818 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2819 time_t now = get_seconds();
2820 /* cannot restart while nested */
2821 BUG_ON(!th->t_trans_id);
2822 if (th->t_refcount > 1)
2823 return 0;
2824 if (journal->j_must_wait > 0 ||
2825 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2826 atomic_read(&(journal->j_jlock)) ||
2827 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2828 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2829 return 1;
2830 }
Chris Mason6ae1ea42006-02-01 03:06:50 -08002831 /* protected by the BKL here */
2832 journal->j_len_alloc += new_alloc;
2833 th->t_blocks_allocated += new_alloc ;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002834 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002835}
2836
2837/* this must be called inside a transaction, and requires the
2838** kernel_lock to be held
2839*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002840void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002841{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002842 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2843 BUG_ON(!th->t_trans_id);
2844 journal->j_must_wait = 1;
2845 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2846 return;
2847}
2848
2849/* this must be called without a transaction started, and does not
2850** require BKL
2851*/
2852void reiserfs_allow_writes(struct super_block *s)
2853{
2854 struct reiserfs_journal *journal = SB_JOURNAL(s);
2855 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2856 wake_up(&journal->j_join_wait);
2857}
2858
2859/* this must be called without a transaction started, and does not
2860** require BKL
2861*/
2862void reiserfs_wait_on_write_block(struct super_block *s)
2863{
2864 struct reiserfs_journal *journal = SB_JOURNAL(s);
2865 wait_event(journal->j_join_wait,
2866 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2867}
2868
2869static void queue_log_writer(struct super_block *s)
2870{
2871 wait_queue_t wait;
2872 struct reiserfs_journal *journal = SB_JOURNAL(s);
2873 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2874
2875 /*
2876 * we don't want to use wait_event here because
2877 * we only want to wait once.
2878 */
2879 init_waitqueue_entry(&wait, current);
2880 add_wait_queue(&journal->j_join_wait, &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002881 set_current_state(TASK_UNINTERRUPTIBLE);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002882 if (test_bit(J_WRITERS_QUEUED, &journal->j_state))
2883 schedule();
2884 current->state = TASK_RUNNING;
2885 remove_wait_queue(&journal->j_join_wait, &wait);
2886}
2887
2888static void wake_queued_writers(struct super_block *s)
2889{
2890 struct reiserfs_journal *journal = SB_JOURNAL(s);
2891 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2892 wake_up(&journal->j_join_wait);
2893}
2894
2895static void let_transaction_grow(struct super_block *sb, unsigned long trans_id)
2896{
2897 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2898 unsigned long bcount = journal->j_bcount;
2899 while (1) {
Nishanth Aravamudan041e0e32005-09-10 00:27:23 -07002900 schedule_timeout_uninterruptible(1);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002901 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2902 while ((atomic_read(&journal->j_wcount) > 0 ||
2903 atomic_read(&journal->j_jlock)) &&
2904 journal->j_trans_id == trans_id) {
2905 queue_log_writer(sb);
2906 }
2907 if (journal->j_trans_id != trans_id)
2908 break;
2909 if (bcount == journal->j_bcount)
2910 break;
2911 bcount = journal->j_bcount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002912 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002913}
2914
2915/* join == true if you must join an existing transaction.
2916** join == false if you can deal with waiting for others to finish
2917**
2918** this will block until the transaction is joinable. send the number of blocks you
2919** expect to use in nblocks.
2920*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002921static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
2922 struct super_block *p_s_sb, unsigned long nblocks,
2923 int join)
2924{
2925 time_t now = get_seconds();
2926 int old_trans_id;
2927 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
2928 struct reiserfs_transaction_handle myth;
2929 int sched_count = 0;
2930 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002931
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002932 reiserfs_check_lock_depth(p_s_sb, "journal_begin");
2933 if (nblocks > journal->j_trans_max)
2934 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002935
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002936 PROC_INFO_INC(p_s_sb, journal.journal_being);
2937 /* set here for journal_join */
2938 th->t_refcount = 1;
2939 th->t_super = p_s_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002940
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002941 relock:
2942 lock_journal(p_s_sb);
2943 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
2944 unlock_journal(p_s_sb);
2945 retval = journal->j_errno;
2946 goto out_fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002947 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002948 journal->j_bcount++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002949
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002950 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
2951 unlock_journal(p_s_sb);
2952 reiserfs_wait_on_write_block(p_s_sb);
2953 PROC_INFO_INC(p_s_sb, journal.journal_relock_writers);
2954 goto relock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002955 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002956 now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002957
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002958 /* if there is no room in the journal OR
2959 ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning
2960 ** we don't sleep if there aren't other writers
2961 */
2962
2963 if ((!join && journal->j_must_wait > 0) ||
2964 (!join
2965 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
2966 || (!join && atomic_read(&journal->j_wcount) > 0
2967 && journal->j_trans_start_time > 0
2968 && (now - journal->j_trans_start_time) >
2969 journal->j_max_trans_age) || (!join
2970 && atomic_read(&journal->j_jlock))
2971 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
2972
2973 old_trans_id = journal->j_trans_id;
2974 unlock_journal(p_s_sb); /* allow others to finish this transaction */
2975
2976 if (!join && (journal->j_len_alloc + nblocks + 2) >=
2977 journal->j_max_batch &&
2978 ((journal->j_len + nblocks + 2) * 100) <
2979 (journal->j_len_alloc * 75)) {
2980 if (atomic_read(&journal->j_wcount) > 10) {
2981 sched_count++;
2982 queue_log_writer(p_s_sb);
2983 goto relock;
2984 }
2985 }
2986 /* don't mess with joining the transaction if all we have to do is
2987 * wait for someone else to do a commit
2988 */
2989 if (atomic_read(&journal->j_jlock)) {
2990 while (journal->j_trans_id == old_trans_id &&
2991 atomic_read(&journal->j_jlock)) {
2992 queue_log_writer(p_s_sb);
2993 }
2994 goto relock;
2995 }
2996 retval = journal_join(&myth, p_s_sb, 1);
2997 if (retval)
2998 goto out_fail;
2999
3000 /* someone might have ended the transaction while we joined */
3001 if (old_trans_id != journal->j_trans_id) {
3002 retval = do_journal_end(&myth, p_s_sb, 1, 0);
3003 } else {
3004 retval = do_journal_end(&myth, p_s_sb, 1, COMMIT_NOW);
3005 }
3006
3007 if (retval)
3008 goto out_fail;
3009
3010 PROC_INFO_INC(p_s_sb, journal.journal_relock_wcount);
3011 goto relock;
3012 }
3013 /* we are the first writer, set trans_id */
3014 if (journal->j_trans_start_time == 0) {
3015 journal->j_trans_start_time = get_seconds();
3016 }
3017 atomic_inc(&(journal->j_wcount));
3018 journal->j_len_alloc += nblocks;
3019 th->t_blocks_logged = 0;
3020 th->t_blocks_allocated = nblocks;
3021 th->t_trans_id = journal->j_trans_id;
3022 unlock_journal(p_s_sb);
3023 INIT_LIST_HEAD(&th->t_list);
3024 get_fs_excl();
3025 return 0;
3026
3027 out_fail:
3028 memset(th, 0, sizeof(*th));
3029 /* Re-set th->t_super, so we can properly keep track of how many
3030 * persistent transactions there are. We need to do this so if this
3031 * call is part of a failed restart_transaction, we can free it later */
3032 th->t_super = p_s_sb;
3033 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003034}
3035
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003036struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3037 super_block
3038 *s,
3039 int nblocks)
3040{
3041 int ret;
3042 struct reiserfs_transaction_handle *th;
3043
3044 /* if we're nesting into an existing transaction. It will be
3045 ** persistent on its own
3046 */
3047 if (reiserfs_transaction_running(s)) {
3048 th = current->journal_info;
3049 th->t_refcount++;
3050 if (th->t_refcount < 2) {
3051 BUG();
3052 }
3053 return th;
3054 }
Pekka Enbergd739b422006-02-01 03:06:43 -08003055 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003056 if (!th)
3057 return NULL;
3058 ret = journal_begin(th, s, nblocks);
3059 if (ret) {
Pekka Enbergd739b422006-02-01 03:06:43 -08003060 kfree(th);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003061 return NULL;
3062 }
3063
3064 SB_JOURNAL(s)->j_persistent_trans++;
3065 return th;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003066}
3067
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003068int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3069{
3070 struct super_block *s = th->t_super;
3071 int ret = 0;
3072 if (th->t_trans_id)
3073 ret = journal_end(th, th->t_super, th->t_blocks_allocated);
3074 else
3075 ret = -EIO;
3076 if (th->t_refcount == 0) {
3077 SB_JOURNAL(s)->j_persistent_trans--;
Pekka Enbergd739b422006-02-01 03:06:43 -08003078 kfree(th);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003079 }
3080 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003081}
3082
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003083static int journal_join(struct reiserfs_transaction_handle *th,
3084 struct super_block *p_s_sb, unsigned long nblocks)
3085{
3086 struct reiserfs_transaction_handle *cur_th = current->journal_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003087
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003088 /* this keeps do_journal_end from NULLing out the current->journal_info
3089 ** pointer
3090 */
3091 th->t_handle_save = cur_th;
3092 if (cur_th && cur_th->t_refcount > 1) {
3093 BUG();
3094 }
3095 return do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_JOIN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003096}
3097
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003098int journal_join_abort(struct reiserfs_transaction_handle *th,
3099 struct super_block *p_s_sb, unsigned long nblocks)
3100{
3101 struct reiserfs_transaction_handle *cur_th = current->journal_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003102
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003103 /* this keeps do_journal_end from NULLing out the current->journal_info
3104 ** pointer
3105 */
3106 th->t_handle_save = cur_th;
3107 if (cur_th && cur_th->t_refcount > 1) {
3108 BUG();
3109 }
3110 return do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_ABORT);
3111}
3112
3113int journal_begin(struct reiserfs_transaction_handle *th,
3114 struct super_block *p_s_sb, unsigned long nblocks)
3115{
3116 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3117 int ret;
3118
3119 th->t_handle_save = NULL;
3120 if (cur_th) {
3121 /* we are nesting into the current transaction */
3122 if (cur_th->t_super == p_s_sb) {
3123 BUG_ON(!cur_th->t_refcount);
3124 cur_th->t_refcount++;
3125 memcpy(th, cur_th, sizeof(*th));
3126 if (th->t_refcount <= 1)
3127 reiserfs_warning(p_s_sb,
3128 "BAD: refcount <= 1, but journal_info != 0");
3129 return 0;
3130 } else {
3131 /* we've ended up with a handle from a different filesystem.
3132 ** save it and restore on journal_end. This should never
3133 ** really happen...
3134 */
3135 reiserfs_warning(p_s_sb,
3136 "clm-2100: nesting info a different FS");
3137 th->t_handle_save = current->journal_info;
3138 current->journal_info = th;
3139 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003140 } else {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003141 current->journal_info = th;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003142 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003143 ret = do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_REG);
3144 if (current->journal_info != th)
3145 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003146
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003147 /* I guess this boils down to being the reciprocal of clm-2100 above.
3148 * If do_journal_begin_r fails, we need to put it back, since journal_end
3149 * won't be called to do it. */
3150 if (ret)
3151 current->journal_info = th->t_handle_save;
3152 else
3153 BUG_ON(!th->t_refcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003154
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003155 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003156}
3157
3158/*
3159** puts bh into the current transaction. If it was already there, reorders removes the
3160** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order).
3161**
3162** if it was dirty, cleans and files onto the clean list. I can't let it be dirty again until the
3163** transaction is committed.
3164**
3165** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3166*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003167int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3168 struct super_block *p_s_sb, struct buffer_head *bh)
3169{
3170 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3171 struct reiserfs_journal_cnode *cn = NULL;
3172 int count_already_incd = 0;
3173 int prepared = 0;
3174 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003175
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003176 PROC_INFO_INC(p_s_sb, journal.mark_dirty);
3177 if (th->t_trans_id != journal->j_trans_id) {
3178 reiserfs_panic(th->t_super,
3179 "journal-1577: handle trans id %ld != current trans id %ld\n",
3180 th->t_trans_id, journal->j_trans_id);
3181 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003182
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003183 p_s_sb->s_dirt = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003184
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003185 prepared = test_clear_buffer_journal_prepared(bh);
3186 clear_buffer_journal_restore_dirty(bh);
3187 /* already in this transaction, we are done */
3188 if (buffer_journaled(bh)) {
3189 PROC_INFO_INC(p_s_sb, journal.mark_dirty_already);
3190 return 0;
3191 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003192
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003193 /* this must be turned into a panic instead of a warning. We can't allow
3194 ** a dirty or journal_dirty or locked buffer to be logged, as some changes
3195 ** could get to disk too early. NOT GOOD.
3196 */
3197 if (!prepared || buffer_dirty(bh)) {
3198 reiserfs_warning(p_s_sb, "journal-1777: buffer %llu bad state "
3199 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3200 (unsigned long long)bh->b_blocknr,
3201 prepared ? ' ' : '!',
3202 buffer_locked(bh) ? ' ' : '!',
3203 buffer_dirty(bh) ? ' ' : '!',
3204 buffer_journal_dirty(bh) ? ' ' : '!');
3205 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003206
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003207 if (atomic_read(&(journal->j_wcount)) <= 0) {
3208 reiserfs_warning(p_s_sb,
3209 "journal-1409: journal_mark_dirty returning because j_wcount was %d",
3210 atomic_read(&(journal->j_wcount)));
3211 return 1;
3212 }
3213 /* this error means I've screwed up, and we've overflowed the transaction.
3214 ** Nothing can be done here, except make the FS readonly or panic.
3215 */
3216 if (journal->j_len >= journal->j_trans_max) {
3217 reiserfs_panic(th->t_super,
3218 "journal-1413: journal_mark_dirty: j_len (%lu) is too big\n",
3219 journal->j_len);
3220 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003221
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003222 if (buffer_journal_dirty(bh)) {
3223 count_already_incd = 1;
3224 PROC_INFO_INC(p_s_sb, journal.mark_dirty_notjournal);
3225 clear_buffer_journal_dirty(bh);
3226 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003227
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003228 if (journal->j_len > journal->j_len_alloc) {
3229 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3230 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003231
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003232 set_buffer_journaled(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003233
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003234 /* now put this guy on the end */
3235 if (!cn) {
3236 cn = get_cnode(p_s_sb);
3237 if (!cn) {
3238 reiserfs_panic(p_s_sb, "get_cnode failed!\n");
3239 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003240
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003241 if (th->t_blocks_logged == th->t_blocks_allocated) {
3242 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3243 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3244 }
3245 th->t_blocks_logged++;
3246 journal->j_len++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003247
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003248 cn->bh = bh;
3249 cn->blocknr = bh->b_blocknr;
3250 cn->sb = p_s_sb;
3251 cn->jlist = NULL;
3252 insert_journal_hash(journal->j_hash_table, cn);
3253 if (!count_already_incd) {
3254 get_bh(bh);
3255 }
3256 }
3257 cn->next = NULL;
3258 cn->prev = journal->j_last;
3259 cn->bh = bh;
3260 if (journal->j_last) {
3261 journal->j_last->next = cn;
3262 journal->j_last = cn;
3263 } else {
3264 journal->j_first = cn;
3265 journal->j_last = cn;
3266 }
3267 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003268}
3269
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003270int journal_end(struct reiserfs_transaction_handle *th,
3271 struct super_block *p_s_sb, unsigned long nblocks)
3272{
3273 if (!current->journal_info && th->t_refcount > 1)
3274 reiserfs_warning(p_s_sb, "REISER-NESTING: th NULL, refcount %d",
3275 th->t_refcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003276
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003277 if (!th->t_trans_id) {
3278 WARN_ON(1);
3279 return -EIO;
3280 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003281
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003282 th->t_refcount--;
3283 if (th->t_refcount > 0) {
3284 struct reiserfs_transaction_handle *cur_th =
3285 current->journal_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003286
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003287 /* we aren't allowed to close a nested transaction on a different
3288 ** filesystem from the one in the task struct
3289 */
3290 if (cur_th->t_super != th->t_super)
3291 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003292
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003293 if (th != cur_th) {
3294 memcpy(current->journal_info, th, sizeof(*th));
3295 th->t_trans_id = 0;
3296 }
3297 return 0;
3298 } else {
3299 return do_journal_end(th, p_s_sb, nblocks, 0);
3300 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003301}
3302
3303/* removes from the current transaction, relsing and descrementing any counters.
3304** also files the removed buffer directly onto the clean list
3305**
3306** called by journal_mark_freed when a block has been deleted
3307**
3308** returns 1 if it cleaned and relsed the buffer. 0 otherwise
3309*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003310static int remove_from_transaction(struct super_block *p_s_sb,
3311 b_blocknr_t blocknr, int already_cleaned)
3312{
3313 struct buffer_head *bh;
3314 struct reiserfs_journal_cnode *cn;
3315 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3316 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003317
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003318 cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, blocknr);
3319 if (!cn || !cn->bh) {
3320 return ret;
3321 }
3322 bh = cn->bh;
3323 if (cn->prev) {
3324 cn->prev->next = cn->next;
3325 }
3326 if (cn->next) {
3327 cn->next->prev = cn->prev;
3328 }
3329 if (cn == journal->j_first) {
3330 journal->j_first = cn->next;
3331 }
3332 if (cn == journal->j_last) {
3333 journal->j_last = cn->prev;
3334 }
3335 if (bh)
3336 remove_journal_hash(p_s_sb, journal->j_hash_table, NULL,
3337 bh->b_blocknr, 0);
3338 clear_buffer_journaled(bh); /* don't log this one */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003339
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003340 if (!already_cleaned) {
3341 clear_buffer_journal_dirty(bh);
3342 clear_buffer_dirty(bh);
3343 clear_buffer_journal_test(bh);
3344 put_bh(bh);
3345 if (atomic_read(&(bh->b_count)) < 0) {
3346 reiserfs_warning(p_s_sb,
3347 "journal-1752: remove from trans, b_count < 0");
3348 }
3349 ret = 1;
3350 }
3351 journal->j_len--;
3352 journal->j_len_alloc--;
3353 free_cnode(p_s_sb, cn);
3354 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003355}
3356
3357/*
3358** for any cnode in a journal list, it can only be dirtied of all the
3359** transactions that include it are commited to disk.
3360** this checks through each transaction, and returns 1 if you are allowed to dirty,
3361** and 0 if you aren't
3362**
3363** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log
3364** blocks for a given transaction on disk
3365**
3366*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003367static int can_dirty(struct reiserfs_journal_cnode *cn)
3368{
3369 struct super_block *sb = cn->sb;
3370 b_blocknr_t blocknr = cn->blocknr;
3371 struct reiserfs_journal_cnode *cur = cn->hprev;
3372 int can_dirty = 1;
3373
3374 /* first test hprev. These are all newer than cn, so any node here
3375 ** with the same block number and dev means this node can't be sent
3376 ** to disk right now.
3377 */
3378 while (cur && can_dirty) {
3379 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3380 cur->blocknr == blocknr) {
3381 can_dirty = 0;
3382 }
3383 cur = cur->hprev;
3384 }
3385 /* then test hnext. These are all older than cn. As long as they
3386 ** are committed to the log, it is safe to write cn to disk
3387 */
3388 cur = cn->hnext;
3389 while (cur && can_dirty) {
3390 if (cur->jlist && cur->jlist->j_len > 0 &&
3391 atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh &&
3392 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3393 can_dirty = 0;
3394 }
3395 cur = cur->hnext;
3396 }
3397 return can_dirty;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003398}
3399
3400/* syncs the commit blocks, but does not force the real buffers to disk
3401** will wait until the current transaction is done/commited before returning
3402*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003403int journal_end_sync(struct reiserfs_transaction_handle *th,
3404 struct super_block *p_s_sb, unsigned long nblocks)
3405{
3406 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003407
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003408 BUG_ON(!th->t_trans_id);
3409 /* you can sync while nested, very, very bad */
3410 if (th->t_refcount > 1) {
3411 BUG();
3412 }
3413 if (journal->j_len == 0) {
3414 reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb),
3415 1);
3416 journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb));
3417 }
3418 return do_journal_end(th, p_s_sb, nblocks, COMMIT_NOW | WAIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003419}
3420
3421/*
3422** writeback the pending async commits to disk
3423*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003424static void flush_async_commits(void *p)
3425{
3426 struct super_block *p_s_sb = p;
3427 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3428 struct reiserfs_journal_list *jl;
3429 struct list_head *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003430
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003431 lock_kernel();
3432 if (!list_empty(&journal->j_journal_list)) {
3433 /* last entry is the youngest, commit it and you get everything */
3434 entry = journal->j_journal_list.prev;
3435 jl = JOURNAL_LIST_ENTRY(entry);
3436 flush_commit_list(p_s_sb, jl, 1);
3437 }
3438 unlock_kernel();
3439 /*
3440 * this is a little racey, but there's no harm in missing
3441 * the filemap_fdata_write
3442 */
3443 if (!atomic_read(&journal->j_async_throttle)
3444 && !reiserfs_is_journal_aborted(journal)) {
3445 atomic_inc(&journal->j_async_throttle);
3446 filemap_fdatawrite(p_s_sb->s_bdev->bd_inode->i_mapping);
3447 atomic_dec(&journal->j_async_throttle);
3448 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003449}
3450
3451/*
3452** flushes any old transactions to disk
3453** ends the current transaction if it is too old
3454*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003455int reiserfs_flush_old_commits(struct super_block *p_s_sb)
3456{
3457 time_t now;
3458 struct reiserfs_transaction_handle th;
3459 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003460
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003461 now = get_seconds();
3462 /* safety check so we don't flush while we are replaying the log during
3463 * mount
3464 */
3465 if (list_empty(&journal->j_journal_list)) {
3466 return 0;
3467 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003468
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003469 /* check the current transaction. If there are no writers, and it is
3470 * too old, finish it, and force the commit blocks to disk
3471 */
3472 if (atomic_read(&journal->j_wcount) <= 0 &&
3473 journal->j_trans_start_time > 0 &&
3474 journal->j_len > 0 &&
3475 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3476 if (!journal_join(&th, p_s_sb, 1)) {
3477 reiserfs_prepare_for_journal(p_s_sb,
3478 SB_BUFFER_WITH_SB(p_s_sb),
3479 1);
3480 journal_mark_dirty(&th, p_s_sb,
3481 SB_BUFFER_WITH_SB(p_s_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003482
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003483 /* we're only being called from kreiserfsd, it makes no sense to do
3484 ** an async commit so that kreiserfsd can do it later
3485 */
3486 do_journal_end(&th, p_s_sb, 1, COMMIT_NOW | WAIT);
3487 }
3488 }
3489 return p_s_sb->s_dirt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003490}
3491
3492/*
3493** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit
3494**
3495** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all
3496** the writers are done. By the time it wakes up, the transaction it was called has already ended, so it just
3497** flushes the commit list and returns 0.
3498**
3499** Won't batch when flush or commit_now is set. Also won't batch when others are waiting on j_join_wait.
3500**
3501** Note, we can't allow the journal_end to proceed while there are still writers in the log.
3502*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003503static int check_journal_end(struct reiserfs_transaction_handle *th,
3504 struct super_block *p_s_sb, unsigned long nblocks,
3505 int flags)
3506{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003507
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003508 time_t now;
3509 int flush = flags & FLUSH_ALL;
3510 int commit_now = flags & COMMIT_NOW;
3511 int wait_on_commit = flags & WAIT;
3512 struct reiserfs_journal_list *jl;
3513 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003514
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003515 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003516
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003517 if (th->t_trans_id != journal->j_trans_id) {
3518 reiserfs_panic(th->t_super,
3519 "journal-1577: handle trans id %ld != current trans id %ld\n",
3520 th->t_trans_id, journal->j_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003521 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003522
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003523 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3524 if (atomic_read(&(journal->j_wcount)) > 0) { /* <= 0 is allowed. unmounting might not call begin */
3525 atomic_dec(&(journal->j_wcount));
3526 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003527
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003528 /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released
3529 ** will be dealt with by next transaction that actually writes something, but should be taken
3530 ** care of in this trans
3531 */
3532 if (journal->j_len == 0) {
3533 BUG();
3534 }
3535 /* if wcount > 0, and we are called to with flush or commit_now,
3536 ** we wait on j_join_wait. We will wake up when the last writer has
3537 ** finished the transaction, and started it on its way to the disk.
3538 ** Then, we flush the commit or journal list, and just return 0
3539 ** because the rest of journal end was already done for this transaction.
3540 */
3541 if (atomic_read(&(journal->j_wcount)) > 0) {
3542 if (flush || commit_now) {
3543 unsigned trans_id;
3544
3545 jl = journal->j_current_jl;
3546 trans_id = jl->j_trans_id;
3547 if (wait_on_commit)
3548 jl->j_state |= LIST_COMMIT_PENDING;
3549 atomic_set(&(journal->j_jlock), 1);
3550 if (flush) {
3551 journal->j_next_full_flush = 1;
3552 }
3553 unlock_journal(p_s_sb);
3554
3555 /* sleep while the current transaction is still j_jlocked */
3556 while (journal->j_trans_id == trans_id) {
3557 if (atomic_read(&journal->j_jlock)) {
3558 queue_log_writer(p_s_sb);
3559 } else {
3560 lock_journal(p_s_sb);
3561 if (journal->j_trans_id == trans_id) {
3562 atomic_set(&(journal->j_jlock),
3563 1);
3564 }
3565 unlock_journal(p_s_sb);
3566 }
3567 }
3568 if (journal->j_trans_id == trans_id) {
3569 BUG();
3570 }
3571 if (commit_now
3572 && journal_list_still_alive(p_s_sb, trans_id)
3573 && wait_on_commit) {
3574 flush_commit_list(p_s_sb, jl, 1);
3575 }
3576 return 0;
3577 }
3578 unlock_journal(p_s_sb);
3579 return 0;
3580 }
3581
3582 /* deal with old transactions where we are the last writers */
3583 now = get_seconds();
3584 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3585 commit_now = 1;
3586 journal->j_next_async_flush = 1;
3587 }
3588 /* don't batch when someone is waiting on j_join_wait */
3589 /* don't batch when syncing the commit or flushing the whole trans */
3590 if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock)))
3591 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3592 && journal->j_len_alloc < journal->j_max_batch
3593 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3594 journal->j_bcount++;
3595 unlock_journal(p_s_sb);
3596 return 0;
3597 }
3598
3599 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(p_s_sb)) {
3600 reiserfs_panic(p_s_sb,
3601 "journal-003: journal_end: j_start (%ld) is too high\n",
3602 journal->j_start);
3603 }
3604 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003605}
3606
3607/*
3608** Does all the work that makes deleting blocks safe.
3609** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on.
3610**
3611** otherwise:
3612** set a bit for the block in the journal bitmap. That will prevent it from being allocated for unformatted nodes
3613** before this transaction has finished.
3614**
3615** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. That will prevent any old transactions with
3616** this block from trying to flush to the real location. Since we aren't removing the cnode from the journal_list_hash,
3617** the block can't be reallocated yet.
3618**
3619** Then remove it from the current transaction, decrementing any counters and filing it on the clean list.
3620*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003621int journal_mark_freed(struct reiserfs_transaction_handle *th,
3622 struct super_block *p_s_sb, b_blocknr_t blocknr)
3623{
3624 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3625 struct reiserfs_journal_cnode *cn = NULL;
3626 struct buffer_head *bh = NULL;
3627 struct reiserfs_list_bitmap *jb = NULL;
3628 int cleaned = 0;
3629 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003630
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003631 cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, blocknr);
3632 if (cn && cn->bh) {
3633 bh = cn->bh;
3634 get_bh(bh);
3635 }
3636 /* if it is journal new, we just remove it from this transaction */
3637 if (bh && buffer_journal_new(bh)) {
3638 clear_buffer_journal_new(bh);
3639 clear_prepared_bits(bh);
3640 reiserfs_clean_and_file_buffer(bh);
3641 cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned);
3642 } else {
3643 /* set the bit for this block in the journal bitmap for this transaction */
3644 jb = journal->j_current_jl->j_list_bitmap;
3645 if (!jb) {
3646 reiserfs_panic(p_s_sb,
3647 "journal-1702: journal_mark_freed, journal_list_bitmap is NULL\n");
3648 }
3649 set_bit_in_list_bitmap(p_s_sb, blocknr, jb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003650
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003651 /* Note, the entire while loop is not allowed to schedule. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003652
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003653 if (bh) {
3654 clear_prepared_bits(bh);
3655 reiserfs_clean_and_file_buffer(bh);
3656 }
3657 cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003658
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003659 /* find all older transactions with this block, make sure they don't try to write it out */
3660 cn = get_journal_hash_dev(p_s_sb, journal->j_list_hash_table,
3661 blocknr);
3662 while (cn) {
3663 if (p_s_sb == cn->sb && blocknr == cn->blocknr) {
3664 set_bit(BLOCK_FREED, &cn->state);
3665 if (cn->bh) {
3666 if (!cleaned) {
3667 /* remove_from_transaction will brelse the buffer if it was
3668 ** in the current trans
3669 */
3670 clear_buffer_journal_dirty(cn->
3671 bh);
3672 clear_buffer_dirty(cn->bh);
3673 clear_buffer_journal_test(cn->
3674 bh);
3675 cleaned = 1;
3676 put_bh(cn->bh);
3677 if (atomic_read
3678 (&(cn->bh->b_count)) < 0) {
3679 reiserfs_warning(p_s_sb,
3680 "journal-2138: cn->bh->b_count < 0");
3681 }
3682 }
3683 if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */
3684 atomic_dec(&
3685 (cn->jlist->
3686 j_nonzerolen));
3687 }
3688 cn->bh = NULL;
3689 }
3690 }
3691 cn = cn->hnext;
3692 }
3693 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003694
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003695 if (bh) {
3696 put_bh(bh); /* get_hash grabs the buffer */
3697 if (atomic_read(&(bh->b_count)) < 0) {
3698 reiserfs_warning(p_s_sb,
3699 "journal-2165: bh->b_count < 0");
3700 }
3701 }
3702 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003703}
3704
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003705void reiserfs_update_inode_transaction(struct inode *inode)
3706{
3707 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3708 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3709 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003710}
3711
3712/*
3713 * returns -1 on error, 0 if no commits/barriers were done and 1
3714 * if a transaction was actually committed and the barrier was done
3715 */
3716static int __commit_trans_jl(struct inode *inode, unsigned long id,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003717 struct reiserfs_journal_list *jl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003718{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003719 struct reiserfs_transaction_handle th;
3720 struct super_block *sb = inode->i_sb;
3721 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3722 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003723
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003724 /* is it from the current transaction, or from an unknown transaction? */
3725 if (id == journal->j_trans_id) {
3726 jl = journal->j_current_jl;
3727 /* try to let other writers come in and grow this transaction */
3728 let_transaction_grow(sb, id);
3729 if (journal->j_trans_id != id) {
3730 goto flush_commit_only;
3731 }
3732
3733 ret = journal_begin(&th, sb, 1);
3734 if (ret)
3735 return ret;
3736
3737 /* someone might have ended this transaction while we joined */
3738 if (journal->j_trans_id != id) {
3739 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3740 1);
3741 journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb));
3742 ret = journal_end(&th, sb, 1);
3743 goto flush_commit_only;
3744 }
3745
3746 ret = journal_end_sync(&th, sb, 1);
3747 if (!ret)
3748 ret = 1;
3749
3750 } else {
3751 /* this gets tricky, we have to make sure the journal list in
3752 * the inode still exists. We know the list is still around
3753 * if we've got a larger transaction id than the oldest list
3754 */
3755 flush_commit_only:
3756 if (journal_list_still_alive(inode->i_sb, id)) {
3757 /*
3758 * we only set ret to 1 when we know for sure
3759 * the barrier hasn't been started yet on the commit
3760 * block.
3761 */
3762 if (atomic_read(&jl->j_commit_left) > 1)
3763 ret = 1;
3764 flush_commit_list(sb, jl, 1);
3765 if (journal->j_errno)
3766 ret = journal->j_errno;
3767 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003768 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003769 /* otherwise the list is gone, and long since committed */
3770 return ret;
3771}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003772
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003773int reiserfs_commit_for_inode(struct inode *inode)
3774{
3775 unsigned long id = REISERFS_I(inode)->i_trans_id;
3776 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003777
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003778 /* for the whole inode, assume unset id means it was
3779 * changed in the current transaction. More conservative
Linus Torvalds1da177e2005-04-16 15:20:36 -07003780 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003781 if (!id || !jl) {
3782 reiserfs_update_inode_transaction(inode);
3783 id = REISERFS_I(inode)->i_trans_id;
3784 /* jl will be updated in __commit_trans_jl */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003785 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003786
3787 return __commit_trans_jl(inode, id, jl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003788}
3789
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003790void reiserfs_restore_prepared_buffer(struct super_block *p_s_sb,
3791 struct buffer_head *bh)
3792{
3793 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3794 PROC_INFO_INC(p_s_sb, journal.restore_prepared);
3795 if (!bh) {
3796 return;
3797 }
3798 if (test_clear_buffer_journal_restore_dirty(bh) &&
3799 buffer_journal_dirty(bh)) {
3800 struct reiserfs_journal_cnode *cn;
3801 cn = get_journal_hash_dev(p_s_sb,
3802 journal->j_list_hash_table,
3803 bh->b_blocknr);
3804 if (cn && can_dirty(cn)) {
3805 set_buffer_journal_test(bh);
3806 mark_buffer_dirty(bh);
3807 }
3808 }
3809 clear_buffer_journal_prepared(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003810}
3811
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003812extern struct tree_balance *cur_tb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003813/*
3814** before we can change a metadata block, we have to make sure it won't
3815** be written to disk while we are altering it. So, we must:
3816** clean it
3817** wait on it.
3818**
3819*/
3820int reiserfs_prepare_for_journal(struct super_block *p_s_sb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003821 struct buffer_head *bh, int wait)
3822{
3823 PROC_INFO_INC(p_s_sb, journal.prepare);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003824
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003825 if (test_set_buffer_locked(bh)) {
3826 if (!wait)
3827 return 0;
3828 lock_buffer(bh);
3829 }
3830 set_buffer_journal_prepared(bh);
3831 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3832 clear_buffer_journal_test(bh);
3833 set_buffer_journal_restore_dirty(bh);
3834 }
3835 unlock_buffer(bh);
3836 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003837}
3838
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003839static void flush_old_journal_lists(struct super_block *s)
3840{
3841 struct reiserfs_journal *journal = SB_JOURNAL(s);
3842 struct reiserfs_journal_list *jl;
3843 struct list_head *entry;
3844 time_t now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003845
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003846 while (!list_empty(&journal->j_journal_list)) {
3847 entry = journal->j_journal_list.next;
3848 jl = JOURNAL_LIST_ENTRY(entry);
3849 /* this check should always be run, to send old lists to disk */
3850 if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4))) {
3851 flush_used_journal_lists(s, jl);
3852 } else {
3853 break;
3854 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003855 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003856}
3857
3858/*
3859** long and ugly. If flush, will not return until all commit
3860** blocks and all real buffers in the trans are on disk.
3861** If no_async, won't return until all commit blocks are on disk.
3862**
3863** keep reading, there are comments as you go along
3864**
3865** If the journal is aborted, we just clean up. Things like flushing
3866** journal lists, etc just won't happen.
3867*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003868static int do_journal_end(struct reiserfs_transaction_handle *th,
3869 struct super_block *p_s_sb, unsigned long nblocks,
3870 int flags)
3871{
3872 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3873 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3874 struct reiserfs_journal_cnode *last_cn = NULL;
3875 struct reiserfs_journal_desc *desc;
3876 struct reiserfs_journal_commit *commit;
3877 struct buffer_head *c_bh; /* commit bh */
3878 struct buffer_head *d_bh; /* desc bh */
3879 int cur_write_start = 0; /* start index of current log write */
3880 int old_start;
3881 int i;
Alexander Zarochentseva44c94a2006-03-25 03:06:59 -08003882 int flush;
3883 int wait_on_commit;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003884 struct reiserfs_journal_list *jl, *temp_jl;
3885 struct list_head *entry, *safe;
3886 unsigned long jindex;
3887 unsigned long commit_trans_id;
3888 int trans_half;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003889
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003890 BUG_ON(th->t_refcount > 1);
3891 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003892
Alexander Zarochentseva44c94a2006-03-25 03:06:59 -08003893 /* protect flush_older_commits from doing mistakes if the
3894 transaction ID counter gets overflowed. */
3895 if (th->t_trans_id == ~0UL)
3896 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
3897 flush = flags & FLUSH_ALL;
3898 wait_on_commit = flags & WAIT;
3899
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003900 put_fs_excl();
3901 current->journal_info = th->t_handle_save;
3902 reiserfs_check_lock_depth(p_s_sb, "journal end");
3903 if (journal->j_len == 0) {
3904 reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb),
3905 1);
3906 journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb));
3907 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003908
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003909 lock_journal(p_s_sb);
3910 if (journal->j_next_full_flush) {
3911 flags |= FLUSH_ALL;
3912 flush = 1;
3913 }
3914 if (journal->j_next_async_flush) {
3915 flags |= COMMIT_NOW | WAIT;
3916 wait_on_commit = 1;
3917 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003918
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003919 /* check_journal_end locks the journal, and unlocks if it does not return 1
3920 ** it tells us if we should continue with the journal_end, or just return
3921 */
3922 if (!check_journal_end(th, p_s_sb, nblocks, flags)) {
3923 p_s_sb->s_dirt = 1;
3924 wake_queued_writers(p_s_sb);
3925 reiserfs_async_progress_wait(p_s_sb);
3926 goto out;
3927 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003928
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003929 /* check_journal_end might set these, check again */
3930 if (journal->j_next_full_flush) {
3931 flush = 1;
3932 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003933
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003934 /*
3935 ** j must wait means we have to flush the log blocks, and the real blocks for
3936 ** this transaction
3937 */
3938 if (journal->j_must_wait > 0) {
3939 flush = 1;
3940 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003941#ifdef REISERFS_PREALLOCATE
Jan Karaef43bc42006-01-11 12:17:40 -08003942 /* quota ops might need to nest, setup the journal_info pointer for them
3943 * and raise the refcount so that it is > 0. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003944 current->journal_info = th;
Jan Karaef43bc42006-01-11 12:17:40 -08003945 th->t_refcount++;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003946 reiserfs_discard_all_prealloc(th); /* it should not involve new blocks into
3947 * the transaction */
Jan Karaef43bc42006-01-11 12:17:40 -08003948 th->t_refcount--;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003949 current->journal_info = th->t_handle_save;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003950#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003951
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003952 /* setup description block */
3953 d_bh =
3954 journal_getblk(p_s_sb,
3955 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
3956 journal->j_start);
3957 set_buffer_uptodate(d_bh);
3958 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
3959 memset(d_bh->b_data, 0, d_bh->b_size);
3960 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
3961 set_desc_trans_id(desc, journal->j_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003962
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003963 /* setup commit block. Don't write (keep it clean too) this one until after everyone else is written */
3964 c_bh = journal_getblk(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
3965 ((journal->j_start + journal->j_len +
3966 1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
3967 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
3968 memset(c_bh->b_data, 0, c_bh->b_size);
3969 set_commit_trans_id(commit, journal->j_trans_id);
3970 set_buffer_uptodate(c_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003971
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003972 /* init this journal list */
3973 jl = journal->j_current_jl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003974
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003975 /* we lock the commit before doing anything because
3976 * we want to make sure nobody tries to run flush_commit_list until
3977 * the new transaction is fully setup, and we've already flushed the
3978 * ordered bh list
3979 */
3980 down(&jl->j_commit_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003981
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003982 /* save the transaction id in case we need to commit it later */
3983 commit_trans_id = jl->j_trans_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003984
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003985 atomic_set(&jl->j_older_commits_done, 0);
3986 jl->j_trans_id = journal->j_trans_id;
3987 jl->j_timestamp = journal->j_trans_start_time;
3988 jl->j_commit_bh = c_bh;
3989 jl->j_start = journal->j_start;
3990 jl->j_len = journal->j_len;
3991 atomic_set(&jl->j_nonzerolen, journal->j_len);
3992 atomic_set(&jl->j_commit_left, journal->j_len + 2);
3993 jl->j_realblock = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003994
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003995 /* The ENTIRE FOR LOOP MUST not cause schedule to occur.
3996 ** for each real block, add it to the journal list hash,
3997 ** copy into real block index array in the commit or desc block
3998 */
3999 trans_half = journal_trans_half(p_s_sb->s_blocksize);
4000 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4001 if (buffer_journaled(cn->bh)) {
4002 jl_cn = get_cnode(p_s_sb);
4003 if (!jl_cn) {
4004 reiserfs_panic(p_s_sb,
4005 "journal-1676, get_cnode returned NULL\n");
4006 }
4007 if (i == 0) {
4008 jl->j_realblock = jl_cn;
4009 }
4010 jl_cn->prev = last_cn;
4011 jl_cn->next = NULL;
4012 if (last_cn) {
4013 last_cn->next = jl_cn;
4014 }
4015 last_cn = jl_cn;
4016 /* make sure the block we are trying to log is not a block
4017 of journal or reserved area */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004018
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004019 if (is_block_in_log_or_reserved_area
4020 (p_s_sb, cn->bh->b_blocknr)) {
4021 reiserfs_panic(p_s_sb,
4022 "journal-2332: Trying to log block %lu, which is a log block\n",
4023 cn->bh->b_blocknr);
4024 }
4025 jl_cn->blocknr = cn->bh->b_blocknr;
4026 jl_cn->state = 0;
4027 jl_cn->sb = p_s_sb;
4028 jl_cn->bh = cn->bh;
4029 jl_cn->jlist = jl;
4030 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4031 if (i < trans_half) {
4032 desc->j_realblock[i] =
4033 cpu_to_le32(cn->bh->b_blocknr);
4034 } else {
4035 commit->j_realblock[i - trans_half] =
4036 cpu_to_le32(cn->bh->b_blocknr);
4037 }
4038 } else {
4039 i--;
4040 }
4041 }
4042 set_desc_trans_len(desc, journal->j_len);
4043 set_desc_mount_id(desc, journal->j_mount_id);
4044 set_desc_trans_id(desc, journal->j_trans_id);
4045 set_commit_trans_len(commit, journal->j_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004046
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004047 /* special check in case all buffers in the journal were marked for not logging */
4048 if (journal->j_len == 0) {
4049 BUG();
4050 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004051
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004052 /* we're about to dirty all the log blocks, mark the description block
4053 * dirty now too. Don't mark the commit block dirty until all the
4054 * others are on disk
4055 */
4056 mark_buffer_dirty(d_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004057
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004058 /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */
4059 cur_write_start = journal->j_start;
4060 cn = journal->j_first;
4061 jindex = 1; /* start at one so we don't get the desc again */
4062 while (cn) {
4063 clear_buffer_journal_new(cn->bh);
4064 /* copy all the real blocks into log area. dirty log blocks */
4065 if (buffer_journaled(cn->bh)) {
4066 struct buffer_head *tmp_bh;
4067 char *addr;
4068 struct page *page;
4069 tmp_bh =
4070 journal_getblk(p_s_sb,
4071 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
4072 ((cur_write_start +
4073 jindex) %
4074 SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
4075 set_buffer_uptodate(tmp_bh);
4076 page = cn->bh->b_page;
4077 addr = kmap(page);
4078 memcpy(tmp_bh->b_data,
4079 addr + offset_in_page(cn->bh->b_data),
4080 cn->bh->b_size);
4081 kunmap(page);
4082 mark_buffer_dirty(tmp_bh);
4083 jindex++;
4084 set_buffer_journal_dirty(cn->bh);
4085 clear_buffer_journaled(cn->bh);
4086 } else {
4087 /* JDirty cleared sometime during transaction. don't log this one */
4088 reiserfs_warning(p_s_sb,
4089 "journal-2048: do_journal_end: BAD, buffer in journal hash, but not JDirty!");
4090 brelse(cn->bh);
4091 }
4092 next = cn->next;
4093 free_cnode(p_s_sb, cn);
4094 cn = next;
4095 cond_resched();
4096 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004097
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004098 /* we are done with both the c_bh and d_bh, but
4099 ** c_bh must be written after all other commit blocks,
4100 ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4101 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004102
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004103 journal->j_current_jl = alloc_journal_list(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004104
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004105 /* now it is safe to insert this transaction on the main list */
4106 list_add_tail(&jl->j_list, &journal->j_journal_list);
4107 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4108 journal->j_num_work_lists++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004109
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004110 /* reset journal values for the next transaction */
4111 old_start = journal->j_start;
4112 journal->j_start =
4113 (journal->j_start + journal->j_len +
4114 2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb);
4115 atomic_set(&(journal->j_wcount), 0);
4116 journal->j_bcount = 0;
4117 journal->j_last = NULL;
4118 journal->j_first = NULL;
4119 journal->j_len = 0;
4120 journal->j_trans_start_time = 0;
Alexander Zarochentseva44c94a2006-03-25 03:06:59 -08004121 /* check for trans_id overflow */
4122 if (++journal->j_trans_id == 0)
4123 journal->j_trans_id = 10;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004124 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4125 journal->j_must_wait = 0;
4126 journal->j_len_alloc = 0;
4127 journal->j_next_full_flush = 0;
4128 journal->j_next_async_flush = 0;
4129 init_journal_hash(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004130
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004131 // make sure reiserfs_add_jh sees the new current_jl before we
4132 // write out the tails
4133 smp_mb();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004134
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004135 /* tail conversion targets have to hit the disk before we end the
4136 * transaction. Otherwise a later transaction might repack the tail
4137 * before this transaction commits, leaving the data block unflushed and
4138 * clean, if we crash before the later transaction commits, the data block
4139 * is lost.
4140 */
4141 if (!list_empty(&jl->j_tail_bh_list)) {
4142 unlock_kernel();
4143 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4144 journal, jl, &jl->j_tail_bh_list);
4145 lock_kernel();
4146 }
4147 if (!list_empty(&jl->j_tail_bh_list))
4148 BUG();
4149 up(&jl->j_commit_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004150
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004151 /* honor the flush wishes from the caller, simple commits can
4152 ** be done outside the journal lock, they are done below
4153 **
4154 ** if we don't flush the commit list right now, we put it into
4155 ** the work queue so the people waiting on the async progress work
4156 ** queue don't wait for this proc to flush journal lists and such.
4157 */
4158 if (flush) {
4159 flush_commit_list(p_s_sb, jl, 1);
4160 flush_journal_list(p_s_sb, jl, 1);
4161 } else if (!(jl->j_state & LIST_COMMIT_PENDING))
4162 queue_delayed_work(commit_wq, &journal->j_work, HZ / 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004163
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004164 /* if the next transaction has any chance of wrapping, flush
4165 ** transactions that might get overwritten. If any journal lists are very
4166 ** old flush them as well.
4167 */
4168 first_jl:
4169 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4170 temp_jl = JOURNAL_LIST_ENTRY(entry);
4171 if (journal->j_start <= temp_jl->j_start) {
4172 if ((journal->j_start + journal->j_trans_max + 1) >=
4173 temp_jl->j_start) {
4174 flush_used_journal_lists(p_s_sb, temp_jl);
4175 goto first_jl;
4176 } else if ((journal->j_start +
4177 journal->j_trans_max + 1) <
4178 SB_ONDISK_JOURNAL_SIZE(p_s_sb)) {
4179 /* if we don't cross into the next transaction and we don't
4180 * wrap, there is no way we can overlap any later transactions
4181 * break now
4182 */
4183 break;
4184 }
4185 } else if ((journal->j_start +
4186 journal->j_trans_max + 1) >
4187 SB_ONDISK_JOURNAL_SIZE(p_s_sb)) {
4188 if (((journal->j_start + journal->j_trans_max + 1) %
4189 SB_ONDISK_JOURNAL_SIZE(p_s_sb)) >=
4190 temp_jl->j_start) {
4191 flush_used_journal_lists(p_s_sb, temp_jl);
4192 goto first_jl;
4193 } else {
4194 /* we don't overlap anything from out start to the end of the
4195 * log, and our wrapped portion doesn't overlap anything at
4196 * the start of the log. We can break
4197 */
4198 break;
4199 }
4200 }
4201 }
4202 flush_old_journal_lists(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004203
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004204 journal->j_current_jl->j_list_bitmap =
4205 get_list_bitmap(p_s_sb, journal->j_current_jl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004206
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004207 if (!(journal->j_current_jl->j_list_bitmap)) {
4208 reiserfs_panic(p_s_sb,
4209 "journal-1996: do_journal_end, could not get a list bitmap\n");
4210 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004211
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004212 atomic_set(&(journal->j_jlock), 0);
4213 unlock_journal(p_s_sb);
4214 /* wake up any body waiting to join. */
4215 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4216 wake_up(&(journal->j_join_wait));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004217
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004218 if (!flush && wait_on_commit &&
4219 journal_list_still_alive(p_s_sb, commit_trans_id)) {
4220 flush_commit_list(p_s_sb, jl, 1);
4221 }
4222 out:
4223 reiserfs_check_lock_depth(p_s_sb, "journal end2");
Linus Torvalds1da177e2005-04-16 15:20:36 -07004224
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004225 memset(th, 0, sizeof(*th));
4226 /* Re-set th->t_super, so we can properly keep track of how many
4227 * persistent transactions there are. We need to do this so if this
4228 * call is part of a failed restart_transaction, we can free it later */
4229 th->t_super = p_s_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004230
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004231 return journal->j_errno;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004232}
4233
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004234static void __reiserfs_journal_abort_hard(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004235{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004236 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4237 if (test_bit(J_ABORTED, &journal->j_state))
4238 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004239
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004240 printk(KERN_CRIT "REISERFS: Aborting journal for filesystem on %s\n",
4241 reiserfs_bdevname(sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004242
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004243 sb->s_flags |= MS_RDONLY;
4244 set_bit(J_ABORTED, &journal->j_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004245
4246#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004247 dump_stack();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004248#endif
4249}
4250
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004251static void __reiserfs_journal_abort_soft(struct super_block *sb, int errno)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004252{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004253 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4254 if (test_bit(J_ABORTED, &journal->j_state))
4255 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004256
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004257 if (!journal->j_errno)
4258 journal->j_errno = errno;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004259
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004260 __reiserfs_journal_abort_hard(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004261}
4262
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004263void reiserfs_journal_abort(struct super_block *sb, int errno)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004264{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004265 return __reiserfs_journal_abort_soft(sb, errno);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004266}