blob: bb05a3e51b93ba709a01135d940e8c3c0fa8f320 [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
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <asm/uaccess.h>
38#include <asm/system.h>
39
40#include <linux/time.h>
41#include <asm/semaphore.h>
42
43#include <linux/vmalloc.h>
44#include <linux/reiserfs_fs.h>
45
46#include <linux/kernel.h>
47#include <linux/errno.h>
48#include <linux/fcntl.h>
49#include <linux/stat.h>
50#include <linux/string.h>
51#include <linux/smp_lock.h>
52#include <linux/buffer_head.h>
53#include <linux/workqueue.h>
54#include <linux/writeback.h>
55#include <linux/blkdev.h>
Andrew Morton3fcfab12006-10-19 23:28:16 -070056#include <linux/backing-dev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
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);
David Howellsc4028952006-11-22 14:57:56 +0000107static void flush_async_commits(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108static 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
Jeff Mahoney3ee16672007-10-18 23:39:25 -0700222static int set_bit_in_list_bitmap(struct super_block *p_s_sb,
223 b_blocknr_t block,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700224 struct reiserfs_list_bitmap *jb)
225{
Jeff Mahoney3ee16672007-10-18 23:39:25 -0700226 unsigned int bmap_nr = block / (p_s_sb->s_blocksize << 3);
227 unsigned int bit_nr = block % (p_s_sb->s_blocksize << 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700229 if (!jb->bitmaps[bmap_nr]) {
230 jb->bitmaps[bmap_nr] = get_bitmap_node(p_s_sb);
231 }
232 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
233 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234}
235
236static void cleanup_bitmap_list(struct super_block *p_s_sb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700237 struct reiserfs_list_bitmap *jb)
238{
239 int i;
240 if (jb->bitmaps == NULL)
241 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
Jeff Mahoneycb680c12007-10-18 23:39:27 -0700243 for (i = 0; i < reiserfs_bmap_count(p_s_sb); i++) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700244 if (jb->bitmaps[i]) {
245 free_bitmap_node(p_s_sb, jb->bitmaps[i]);
246 jb->bitmaps[i] = NULL;
247 }
248 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249}
250
251/*
252** only call this on FS unmount.
253*/
254static int free_list_bitmaps(struct super_block *p_s_sb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700255 struct reiserfs_list_bitmap *jb_array)
256{
257 int i;
258 struct reiserfs_list_bitmap *jb;
259 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
260 jb = jb_array + i;
261 jb->journal_list = NULL;
262 cleanup_bitmap_list(p_s_sb, jb);
263 vfree(jb->bitmaps);
264 jb->bitmaps = NULL;
265 }
266 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267}
268
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700269static int free_bitmap_nodes(struct super_block *p_s_sb)
270{
271 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
272 struct list_head *next = journal->j_bitmap_nodes.next;
273 struct reiserfs_bitmap_node *bn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700275 while (next != &journal->j_bitmap_nodes) {
276 bn = list_entry(next, struct reiserfs_bitmap_node, list);
277 list_del(next);
Pekka Enbergd739b422006-02-01 03:06:43 -0800278 kfree(bn->data);
279 kfree(bn);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700280 next = journal->j_bitmap_nodes.next;
281 journal->j_free_bitmap_nodes--;
282 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700284 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285}
286
287/*
288** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
289** jb_array is the array to be filled in.
290*/
291int reiserfs_allocate_list_bitmaps(struct super_block *p_s_sb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700292 struct reiserfs_list_bitmap *jb_array,
Jeff Mahoney3ee16672007-10-18 23:39:25 -0700293 unsigned int bmap_nr)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700294{
295 int i;
296 int failed = 0;
297 struct reiserfs_list_bitmap *jb;
298 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700300 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
301 jb = jb_array + i;
302 jb->journal_list = NULL;
303 jb->bitmaps = vmalloc(mem);
304 if (!jb->bitmaps) {
305 reiserfs_warning(p_s_sb,
306 "clm-2000, unable to allocate bitmaps for journal lists");
307 failed = 1;
308 break;
309 }
310 memset(jb->bitmaps, 0, mem);
311 }
312 if (failed) {
313 free_list_bitmaps(p_s_sb, jb_array);
314 return -1;
315 }
316 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317}
318
319/*
320** find an available list bitmap. If you can't find one, flush a commit list
321** and try again
322*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700323static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *p_s_sb,
324 struct reiserfs_journal_list
325 *jl)
326{
327 int i, j;
328 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
329 struct reiserfs_list_bitmap *jb = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700331 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
332 i = journal->j_list_bitmap_index;
333 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
334 jb = journal->j_list_bitmap + i;
335 if (journal->j_list_bitmap[i].journal_list) {
336 flush_commit_list(p_s_sb,
337 journal->j_list_bitmap[i].
338 journal_list, 1);
339 if (!journal->j_list_bitmap[i].journal_list) {
340 break;
341 }
342 } else {
343 break;
344 }
345 }
346 if (jb->journal_list) { /* double check to make sure if flushed correctly */
347 return NULL;
348 }
349 jb->journal_list = jl;
350 return jb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351}
352
353/*
354** allocates a new chunk of X nodes, and links them all together as a list.
355** Uses the cnode->next and cnode->prev pointers
356** returns NULL on failure
357*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700358static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
359{
360 struct reiserfs_journal_cnode *head;
361 int i;
362 if (num_cnodes <= 0) {
363 return NULL;
364 }
365 head = vmalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
366 if (!head) {
367 return NULL;
368 }
369 memset(head, 0, num_cnodes * sizeof(struct reiserfs_journal_cnode));
370 head[0].prev = NULL;
371 head[0].next = head + 1;
372 for (i = 1; i < num_cnodes; i++) {
373 head[i].prev = head + (i - 1);
374 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */
375 }
376 head[num_cnodes - 1].next = NULL;
377 return head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378}
379
380/*
381** pulls a cnode off the free list, or returns NULL on failure
382*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700383static struct reiserfs_journal_cnode *get_cnode(struct super_block *p_s_sb)
384{
385 struct reiserfs_journal_cnode *cn;
386 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700388 reiserfs_check_lock_depth(p_s_sb, "get_cnode");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700390 if (journal->j_cnode_free <= 0) {
391 return NULL;
392 }
393 journal->j_cnode_used++;
394 journal->j_cnode_free--;
395 cn = journal->j_cnode_free_list;
396 if (!cn) {
397 return cn;
398 }
399 if (cn->next) {
400 cn->next->prev = NULL;
401 }
402 journal->j_cnode_free_list = cn->next;
403 memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
404 return cn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405}
406
407/*
408** returns a cnode to the free list
409*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700410static void free_cnode(struct super_block *p_s_sb,
411 struct reiserfs_journal_cnode *cn)
412{
413 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700415 reiserfs_check_lock_depth(p_s_sb, "free_cnode");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700417 journal->j_cnode_used--;
418 journal->j_cnode_free++;
419 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
420 cn->next = journal->j_cnode_free_list;
421 if (journal->j_cnode_free_list) {
422 journal->j_cnode_free_list->prev = cn;
423 }
424 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */
425 journal->j_cnode_free_list = cn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426}
427
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700428static void clear_prepared_bits(struct buffer_head *bh)
429{
430 clear_buffer_journal_prepared(bh);
431 clear_buffer_journal_restore_dirty(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432}
433
434/* utility function to force a BUG if it is called without the big
435** kernel lock held. caller is the string printed just before calling BUG()
436*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700437void reiserfs_check_lock_depth(struct super_block *sb, char *caller)
438{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439#ifdef CONFIG_SMP
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700440 if (current->lock_depth < 0) {
441 reiserfs_panic(sb, "%s called without kernel lock held",
442 caller);
443 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444#else
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700445 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446#endif
447}
448
449/* return a cnode with same dev, block number and size in table, or null if not found */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700450static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
451 super_block
452 *sb,
453 struct
454 reiserfs_journal_cnode
455 **table,
456 long bl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700458 struct reiserfs_journal_cnode *cn;
459 cn = journal_hash(table, sb, bl);
460 while (cn) {
461 if (cn->blocknr == bl && cn->sb == sb)
462 return cn;
463 cn = cn->hnext;
464 }
465 return (struct reiserfs_journal_cnode *)0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466}
467
468/*
469** this actually means 'can this block be reallocated yet?'. If you set search_all, a block can only be allocated
470** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever
471** being overwritten by a replay after crashing.
472**
473** If you don't set search_all, a block can only be allocated if it is not in the current transaction. Since deleting
474** a block removes it from the current transaction, this case should never happen. If you don't set search_all, make
475** sure you never write the block without logging it.
476**
477** next_zero_bit is a suggestion about the next block to try for find_forward.
478** when bl is rejected because it is set in a journal list bitmap, we search
479** for the next zero bit in the bitmap that rejected bl. Then, we return that
480** through next_zero_bit for find_forward to try.
481**
482** Just because we return something in next_zero_bit does not mean we won't
483** reject it on the next call to reiserfs_in_journal
484**
485*/
486int reiserfs_in_journal(struct super_block *p_s_sb,
Jeff Mahoney3ee16672007-10-18 23:39:25 -0700487 unsigned int bmap_nr, int bit_nr, int search_all,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700488 b_blocknr_t * next_zero_bit)
489{
490 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
491 struct reiserfs_journal_cnode *cn;
492 struct reiserfs_list_bitmap *jb;
493 int i;
494 unsigned long bl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700496 *next_zero_bit = 0; /* always start this at zero. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700498 PROC_INFO_INC(p_s_sb, journal.in_journal);
499 /* If we aren't doing a search_all, this is a metablock, and it will be logged before use.
500 ** if we crash before the transaction that freed it commits, this transaction won't
501 ** have committed either, and the block will never be written
502 */
503 if (search_all) {
504 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
505 PROC_INFO_INC(p_s_sb, journal.in_journal_bitmap);
506 jb = journal->j_list_bitmap + i;
507 if (jb->journal_list && jb->bitmaps[bmap_nr] &&
508 test_bit(bit_nr,
509 (unsigned long *)jb->bitmaps[bmap_nr]->
510 data)) {
511 *next_zero_bit =
512 find_next_zero_bit((unsigned long *)
513 (jb->bitmaps[bmap_nr]->
514 data),
515 p_s_sb->s_blocksize << 3,
516 bit_nr + 1);
517 return 1;
518 }
519 }
520 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700522 bl = bmap_nr * (p_s_sb->s_blocksize << 3) + bit_nr;
523 /* is it in any old transactions? */
524 if (search_all
525 && (cn =
526 get_journal_hash_dev(p_s_sb, journal->j_list_hash_table, bl))) {
527 return 1;
528 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700530 /* is it in the current transaction. This should never happen */
531 if ((cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, bl))) {
532 BUG();
533 return 1;
534 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700536 PROC_INFO_INC(p_s_sb, journal.in_journal_reusable);
537 /* safe for reuse */
538 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539}
540
541/* insert cn into table
542*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700543static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
544 struct reiserfs_journal_cnode *cn)
545{
546 struct reiserfs_journal_cnode *cn_orig;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700548 cn_orig = journal_hash(table, cn->sb, cn->blocknr);
549 cn->hnext = cn_orig;
550 cn->hprev = NULL;
551 if (cn_orig) {
552 cn_orig->hprev = cn;
553 }
554 journal_hash(table, cn->sb, cn->blocknr) = cn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555}
556
557/* lock the current transaction */
Jesper Juhl77933d72005-07-27 11:46:09 -0700558static inline void lock_journal(struct super_block *p_s_sb)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700559{
560 PROC_INFO_INC(p_s_sb, journal.lock_journal);
561 down(&SB_JOURNAL(p_s_sb)->j_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562}
563
564/* unlock the current transaction */
Jesper Juhl77933d72005-07-27 11:46:09 -0700565static inline void unlock_journal(struct super_block *p_s_sb)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700566{
567 up(&SB_JOURNAL(p_s_sb)->j_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568}
569
570static inline void get_journal_list(struct reiserfs_journal_list *jl)
571{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700572 jl->j_refcount++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573}
574
575static inline void put_journal_list(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700576 struct reiserfs_journal_list *jl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700578 if (jl->j_refcount < 1) {
579 reiserfs_panic(s, "trans id %lu, refcount at %d",
580 jl->j_trans_id, jl->j_refcount);
581 }
582 if (--jl->j_refcount == 0)
Pekka Enbergd739b422006-02-01 03:06:43 -0800583 kfree(jl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584}
585
586/*
587** this used to be much more involved, and I'm keeping it just in case things get ugly again.
588** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a
589** transaction.
590*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700591static void cleanup_freed_for_journal_list(struct super_block *p_s_sb,
592 struct reiserfs_journal_list *jl)
593{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700595 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
596 if (jb) {
597 cleanup_bitmap_list(p_s_sb, jb);
598 }
599 jl->j_list_bitmap->journal_list = NULL;
600 jl->j_list_bitmap = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601}
602
603static int journal_list_still_alive(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700604 unsigned long trans_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700606 struct reiserfs_journal *journal = SB_JOURNAL(s);
607 struct list_head *entry = &journal->j_journal_list;
608 struct reiserfs_journal_list *jl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700610 if (!list_empty(entry)) {
611 jl = JOURNAL_LIST_ENTRY(entry->next);
612 if (jl->j_trans_id <= trans_id) {
613 return 1;
614 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700616 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617}
618
Chris Mason398c95b2007-10-16 23:29:44 -0700619/*
620 * If page->mapping was null, we failed to truncate this page for
621 * some reason. Most likely because it was truncated after being
622 * logged via data=journal.
623 *
624 * This does a check to see if the buffer belongs to one of these
625 * lost pages before doing the final put_bh. If page->mapping was
626 * null, it tries to free buffers on the page, which should make the
627 * final page_cache_release drop the page from the lru.
628 */
629static void release_buffer_page(struct buffer_head *bh)
630{
631 struct page *page = bh->b_page;
632 if (!page->mapping && !TestSetPageLocked(page)) {
633 page_cache_get(page);
634 put_bh(bh);
635 if (!page->mapping)
636 try_to_free_buffers(page);
637 unlock_page(page);
638 page_cache_release(page);
639 } else {
640 put_bh(bh);
641 }
642}
643
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700644static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
645{
646 char b[BDEVNAME_SIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700648 if (buffer_journaled(bh)) {
649 reiserfs_warning(NULL,
650 "clm-2084: pinned buffer %lu:%s sent to disk",
651 bh->b_blocknr, bdevname(bh->b_bdev, b));
652 }
653 if (uptodate)
654 set_buffer_uptodate(bh);
655 else
656 clear_buffer_uptodate(bh);
Chris Mason398c95b2007-10-16 23:29:44 -0700657
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700658 unlock_buffer(bh);
Chris Mason398c95b2007-10-16 23:29:44 -0700659 release_buffer_page(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660}
661
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700662static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
663{
664 if (uptodate)
665 set_buffer_uptodate(bh);
666 else
667 clear_buffer_uptodate(bh);
668 unlock_buffer(bh);
669 put_bh(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670}
671
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700672static void submit_logged_buffer(struct buffer_head *bh)
673{
674 get_bh(bh);
675 bh->b_end_io = reiserfs_end_buffer_io_sync;
676 clear_buffer_journal_new(bh);
677 clear_buffer_dirty(bh);
678 if (!test_clear_buffer_journal_test(bh))
679 BUG();
680 if (!buffer_uptodate(bh))
681 BUG();
682 submit_bh(WRITE, bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683}
684
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700685static void submit_ordered_buffer(struct buffer_head *bh)
686{
687 get_bh(bh);
688 bh->b_end_io = reiserfs_end_ordered_io;
689 clear_buffer_dirty(bh);
690 if (!buffer_uptodate(bh))
691 BUG();
692 submit_bh(WRITE, bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693}
694
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700695static int submit_barrier_buffer(struct buffer_head *bh)
696{
697 get_bh(bh);
698 bh->b_end_io = reiserfs_end_ordered_io;
699 clear_buffer_dirty(bh);
700 if (!buffer_uptodate(bh))
701 BUG();
702 return submit_bh(WRITE_BARRIER, bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703}
704
705static void check_barrier_completion(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700706 struct buffer_head *bh)
707{
708 if (buffer_eopnotsupp(bh)) {
709 clear_buffer_eopnotsupp(bh);
710 disable_barrier(s);
711 set_buffer_uptodate(bh);
712 set_buffer_dirty(bh);
713 sync_dirty_buffer(bh);
714 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715}
716
717#define CHUNK_SIZE 32
718struct buffer_chunk {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700719 struct buffer_head *bh[CHUNK_SIZE];
720 int nr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721};
722
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700723static void write_chunk(struct buffer_chunk *chunk)
724{
725 int i;
726 get_fs_excl();
727 for (i = 0; i < chunk->nr; i++) {
728 submit_logged_buffer(chunk->bh[i]);
729 }
730 chunk->nr = 0;
731 put_fs_excl();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732}
733
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700734static void write_ordered_chunk(struct buffer_chunk *chunk)
735{
736 int i;
737 get_fs_excl();
738 for (i = 0; i < chunk->nr; i++) {
739 submit_ordered_buffer(chunk->bh[i]);
740 }
741 chunk->nr = 0;
742 put_fs_excl();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743}
744
745static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700746 spinlock_t * lock, void (fn) (struct buffer_chunk *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700748 int ret = 0;
Eric Sesterhenn14a61442006-10-03 23:36:38 +0200749 BUG_ON(chunk->nr >= CHUNK_SIZE);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700750 chunk->bh[chunk->nr++] = bh;
751 if (chunk->nr >= CHUNK_SIZE) {
752 ret = 1;
753 if (lock)
754 spin_unlock(lock);
755 fn(chunk);
756 if (lock)
757 spin_lock(lock);
758 }
759 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760}
761
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700763static struct reiserfs_jh *alloc_jh(void)
764{
765 struct reiserfs_jh *jh;
766 while (1) {
767 jh = kmalloc(sizeof(*jh), GFP_NOFS);
768 if (jh) {
769 atomic_inc(&nr_reiserfs_jh);
770 return jh;
771 }
772 yield();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774}
775
776/*
777 * we want to free the jh when the buffer has been written
778 * and waited on
779 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700780void reiserfs_free_jh(struct buffer_head *bh)
781{
782 struct reiserfs_jh *jh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700784 jh = bh->b_private;
785 if (jh) {
786 bh->b_private = NULL;
787 jh->bh = NULL;
788 list_del_init(&jh->list);
789 kfree(jh);
790 if (atomic_read(&nr_reiserfs_jh) <= 0)
791 BUG();
792 atomic_dec(&nr_reiserfs_jh);
793 put_bh(bh);
794 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795}
796
797static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700798 int tail)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700800 struct reiserfs_jh *jh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700802 if (bh->b_private) {
803 spin_lock(&j->j_dirty_buffers_lock);
804 if (!bh->b_private) {
805 spin_unlock(&j->j_dirty_buffers_lock);
806 goto no_jh;
807 }
808 jh = bh->b_private;
809 list_del_init(&jh->list);
810 } else {
811 no_jh:
812 get_bh(bh);
813 jh = alloc_jh();
814 spin_lock(&j->j_dirty_buffers_lock);
815 /* buffer must be locked for __add_jh, should be able to have
816 * two adds at the same time
817 */
Eric Sesterhenn14a61442006-10-03 23:36:38 +0200818 BUG_ON(bh->b_private);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700819 jh->bh = bh;
820 bh->b_private = jh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700822 jh->jl = j->j_current_jl;
823 if (tail)
824 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
825 else {
826 list_add_tail(&jh->list, &jh->jl->j_bh_list);
827 }
828 spin_unlock(&j->j_dirty_buffers_lock);
829 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830}
831
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700832int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
833{
834 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700836int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
837{
838 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839}
840
841#define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700842static int write_ordered_buffers(spinlock_t * lock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 struct reiserfs_journal *j,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700844 struct reiserfs_journal_list *jl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 struct list_head *list)
846{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700847 struct buffer_head *bh;
848 struct reiserfs_jh *jh;
849 int ret = j->j_errno;
850 struct buffer_chunk chunk;
851 struct list_head tmp;
852 INIT_LIST_HEAD(&tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700854 chunk.nr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 spin_lock(lock);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700856 while (!list_empty(list)) {
857 jh = JH_ENTRY(list->next);
858 bh = jh->bh;
859 get_bh(bh);
860 if (test_set_buffer_locked(bh)) {
861 if (!buffer_dirty(bh)) {
Akinobu Mitaf1166292006-06-26 00:24:46 -0700862 list_move(&jh->list, &tmp);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700863 goto loop_next;
864 }
865 spin_unlock(lock);
866 if (chunk.nr)
867 write_ordered_chunk(&chunk);
868 wait_on_buffer(bh);
869 cond_resched();
870 spin_lock(lock);
871 goto loop_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 }
Chris Mason3d4492f2006-02-01 03:06:49 -0800873 /* in theory, dirty non-uptodate buffers should never get here,
874 * but the upper layer io error paths still have a few quirks.
875 * Handle them here as gracefully as we can
876 */
877 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
878 clear_buffer_dirty(bh);
879 ret = -EIO;
880 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700881 if (buffer_dirty(bh)) {
Akinobu Mitaf1166292006-06-26 00:24:46 -0700882 list_move(&jh->list, &tmp);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700883 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
884 } else {
885 reiserfs_free_jh(bh);
886 unlock_buffer(bh);
887 }
888 loop_next:
889 put_bh(bh);
890 cond_resched_lock(lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700892 if (chunk.nr) {
893 spin_unlock(lock);
894 write_ordered_chunk(&chunk);
895 spin_lock(lock);
896 }
897 while (!list_empty(&tmp)) {
898 jh = JH_ENTRY(tmp.prev);
899 bh = jh->bh;
900 get_bh(bh);
901 reiserfs_free_jh(bh);
902
903 if (buffer_locked(bh)) {
904 spin_unlock(lock);
905 wait_on_buffer(bh);
906 spin_lock(lock);
907 }
908 if (!buffer_uptodate(bh)) {
909 ret = -EIO;
910 }
Chris Masond62b1b82006-02-01 03:06:47 -0800911 /* ugly interaction with invalidatepage here.
912 * reiserfs_invalidate_page will pin any buffer that has a valid
913 * journal head from an older transaction. If someone else sets
914 * our buffer dirty after we write it in the first loop, and
915 * then someone truncates the page away, nobody will ever write
916 * the buffer. We're safe if we write the page one last time
917 * after freeing the journal header.
918 */
919 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
920 spin_unlock(lock);
921 ll_rw_block(WRITE, 1, &bh);
922 spin_lock(lock);
923 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700924 put_bh(bh);
925 cond_resched_lock(lock);
926 }
927 spin_unlock(lock);
928 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700930
931static int flush_older_commits(struct super_block *s,
932 struct reiserfs_journal_list *jl)
933{
934 struct reiserfs_journal *journal = SB_JOURNAL(s);
935 struct reiserfs_journal_list *other_jl;
936 struct reiserfs_journal_list *first_jl;
937 struct list_head *entry;
938 unsigned long trans_id = jl->j_trans_id;
939 unsigned long other_trans_id;
940 unsigned long first_trans_id;
941
942 find_first:
943 /*
944 * first we walk backwards to find the oldest uncommitted transation
945 */
946 first_jl = jl;
947 entry = jl->j_list.prev;
948 while (1) {
949 other_jl = JOURNAL_LIST_ENTRY(entry);
950 if (entry == &journal->j_journal_list ||
951 atomic_read(&other_jl->j_older_commits_done))
952 break;
953
954 first_jl = other_jl;
955 entry = other_jl->j_list.prev;
956 }
957
958 /* if we didn't find any older uncommitted transactions, return now */
959 if (first_jl == jl) {
960 return 0;
961 }
962
963 first_trans_id = first_jl->j_trans_id;
964
965 entry = &first_jl->j_list;
966 while (1) {
967 other_jl = JOURNAL_LIST_ENTRY(entry);
968 other_trans_id = other_jl->j_trans_id;
969
970 if (other_trans_id < trans_id) {
971 if (atomic_read(&other_jl->j_commit_left) != 0) {
972 flush_commit_list(s, other_jl, 0);
973
974 /* list we were called with is gone, return */
975 if (!journal_list_still_alive(s, trans_id))
976 return 1;
977
978 /* the one we just flushed is gone, this means all
979 * older lists are also gone, so first_jl is no longer
980 * valid either. Go back to the beginning.
981 */
982 if (!journal_list_still_alive
983 (s, other_trans_id)) {
984 goto find_first;
985 }
986 }
987 entry = entry->next;
988 if (entry == &journal->j_journal_list)
989 return 0;
990 } else {
991 return 0;
992 }
993 }
994 return 0;
995}
Adrian Bunkdeba0f42007-10-16 23:26:03 -0700996
997static int reiserfs_async_progress_wait(struct super_block *s)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700998{
999 DEFINE_WAIT(wait);
1000 struct reiserfs_journal *j = SB_JOURNAL(s);
1001 if (atomic_read(&j->j_async_throttle))
Andrew Morton3fcfab12006-10-19 23:28:16 -07001002 congestion_wait(WRITE, HZ / 10);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001003 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004}
1005
1006/*
1007** if this journal list still has commit blocks unflushed, send them to disk.
1008**
1009** log areas must be flushed in order (transaction 2 can't commit before transaction 1)
1010** Before the commit block can by written, every other log block must be safely on disk
1011**
1012*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001013static int flush_commit_list(struct super_block *s,
1014 struct reiserfs_journal_list *jl, int flushall)
1015{
1016 int i;
Jeff Mahoney3ee16672007-10-18 23:39:25 -07001017 b_blocknr_t bn;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001018 struct buffer_head *tbh = NULL;
1019 unsigned long trans_id = jl->j_trans_id;
1020 struct reiserfs_journal *journal = SB_JOURNAL(s);
1021 int barrier = 0;
1022 int retval = 0;
Chris Masone0e851c2006-02-01 03:06:49 -08001023 int write_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001025 reiserfs_check_lock_depth(s, "flush_commit_list");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001027 if (atomic_read(&jl->j_older_commits_done)) {
1028 return 0;
1029 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001031 get_fs_excl();
Jens Axboe22e2c502005-06-27 10:55:12 +02001032
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001033 /* before we can put our commit blocks on disk, we have to make sure everyone older than
1034 ** us is on disk too
1035 */
1036 BUG_ON(jl->j_len <= 0);
1037 BUG_ON(trans_id == journal->j_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001039 get_journal_list(jl);
1040 if (flushall) {
1041 if (flush_older_commits(s, jl) == 1) {
1042 /* list disappeared during flush_older_commits. return */
1043 goto put_jl;
1044 }
1045 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001047 /* make sure nobody is trying to flush this one at the same time */
1048 down(&jl->j_commit_lock);
1049 if (!journal_list_still_alive(s, trans_id)) {
1050 up(&jl->j_commit_lock);
1051 goto put_jl;
1052 }
1053 BUG_ON(jl->j_trans_id == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001055 /* this commit is done, exit */
1056 if (atomic_read(&(jl->j_commit_left)) <= 0) {
1057 if (flushall) {
1058 atomic_set(&(jl->j_older_commits_done), 1);
1059 }
1060 up(&jl->j_commit_lock);
1061 goto put_jl;
1062 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001064 if (!list_empty(&jl->j_bh_list)) {
Chris Mason3d4492f2006-02-01 03:06:49 -08001065 int ret;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001066 unlock_kernel();
Chris Mason3d4492f2006-02-01 03:06:49 -08001067 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1068 journal, jl, &jl->j_bh_list);
1069 if (ret < 0 && retval == 0)
1070 retval = ret;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001071 lock_kernel();
1072 }
1073 BUG_ON(!list_empty(&jl->j_bh_list));
1074 /*
1075 * for the description block and all the log blocks, submit any buffers
Chris Masone0e851c2006-02-01 03:06:49 -08001076 * that haven't already reached the disk. Try to write at least 256
1077 * log blocks. later on, we will only wait on blocks that correspond
1078 * to this transaction, but while we're unplugging we might as well
1079 * get a chunk of data on there.
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001080 */
1081 atomic_inc(&journal->j_async_throttle);
Chris Masone0e851c2006-02-01 03:06:49 -08001082 write_len = jl->j_len + 1;
1083 if (write_len < 256)
1084 write_len = 256;
1085 for (i = 0 ; i < write_len ; i++) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001086 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1087 SB_ONDISK_JOURNAL_SIZE(s);
1088 tbh = journal_find_get_block(s, bn);
Chris Masone0e851c2006-02-01 03:06:49 -08001089 if (tbh) {
1090 if (buffer_dirty(tbh))
1091 ll_rw_block(WRITE, 1, &tbh) ;
1092 put_bh(tbh) ;
1093 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001094 }
1095 atomic_dec(&journal->j_async_throttle);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096
Jeff Mahoney5d5e81562005-12-14 14:38:36 -05001097 /* We're skipping the commit if there's an error */
1098 if (retval || reiserfs_is_journal_aborted(journal))
1099 barrier = 0;
1100
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001101 /* wait on everything written so far before writing the commit
1102 * if we are in barrier mode, send the commit down now
1103 */
1104 barrier = reiserfs_barrier_flush(s);
1105 if (barrier) {
1106 int ret;
1107 lock_buffer(jl->j_commit_bh);
1108 ret = submit_barrier_buffer(jl->j_commit_bh);
1109 if (ret == -EOPNOTSUPP) {
1110 set_buffer_uptodate(jl->j_commit_bh);
1111 disable_barrier(s);
1112 barrier = 0;
1113 }
1114 }
1115 for (i = 0; i < (jl->j_len + 1); i++) {
1116 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1117 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1118 tbh = journal_find_get_block(s, bn);
1119 wait_on_buffer(tbh);
1120 // since we're using ll_rw_blk above, it might have skipped over
1121 // a locked buffer. Double check here
1122 //
1123 if (buffer_dirty(tbh)) /* redundant, sync_dirty_buffer() checks */
1124 sync_dirty_buffer(tbh);
1125 if (unlikely(!buffer_uptodate(tbh))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001127 reiserfs_warning(s, "journal-601, buffer write failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001129 retval = -EIO;
1130 }
1131 put_bh(tbh); /* once for journal_find_get_block */
1132 put_bh(tbh); /* once due to original getblk in do_journal_end */
1133 atomic_dec(&(jl->j_commit_left));
1134 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001136 BUG_ON(atomic_read(&(jl->j_commit_left)) != 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001138 if (!barrier) {
Jeff Mahoney5d5e81562005-12-14 14:38:36 -05001139 /* If there was a write error in the journal - we can't commit
1140 * this transaction - it will be invalid and, if successful,
Robert P. J. Daybeb7dd82007-05-09 07:14:03 +02001141 * will just end up propagating the write error out to
Jeff Mahoney5d5e81562005-12-14 14:38:36 -05001142 * the file system. */
1143 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1144 if (buffer_dirty(jl->j_commit_bh))
1145 BUG();
1146 mark_buffer_dirty(jl->j_commit_bh) ;
1147 sync_dirty_buffer(jl->j_commit_bh) ;
1148 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001149 } else
1150 wait_on_buffer(jl->j_commit_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001152 check_barrier_completion(s, jl->j_commit_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001154 /* If there was a write error in the journal - we can't commit this
1155 * transaction - it will be invalid and, if successful, will just end
Robert P. J. Daybeb7dd82007-05-09 07:14:03 +02001156 * up propagating the write error out to the filesystem. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001157 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001159 reiserfs_warning(s, "journal-615: buffer write failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001161 retval = -EIO;
1162 }
1163 bforget(jl->j_commit_bh);
1164 if (journal->j_last_commit_id != 0 &&
1165 (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1166 reiserfs_warning(s, "clm-2200: last commit %lu, current %lu",
1167 journal->j_last_commit_id, jl->j_trans_id);
1168 }
1169 journal->j_last_commit_id = jl->j_trans_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001171 /* now, every commit block is on the disk. It is safe to allow blocks freed during this transaction to be reallocated */
1172 cleanup_freed_for_journal_list(s, jl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001174 retval = retval ? retval : journal->j_errno;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001176 /* mark the metadata dirty */
1177 if (!retval)
1178 dirty_one_transaction(s, jl);
1179 atomic_dec(&(jl->j_commit_left));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001181 if (flushall) {
1182 atomic_set(&(jl->j_older_commits_done), 1);
1183 }
1184 up(&jl->j_commit_lock);
1185 put_jl:
1186 put_journal_list(s, jl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001188 if (retval)
1189 reiserfs_abort(s, retval, "Journal write error in %s",
1190 __FUNCTION__);
1191 put_fs_excl();
1192 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193}
1194
1195/*
1196** flush_journal_list frequently needs to find a newer transaction for a given block. This does that, or
1197** returns NULL if it can't find anything
1198*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001199static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1200 reiserfs_journal_cnode
1201 *cn)
1202{
1203 struct super_block *sb = cn->sb;
1204 b_blocknr_t blocknr = cn->blocknr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001206 cn = cn->hprev;
1207 while (cn) {
1208 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1209 return cn->jlist;
1210 }
1211 cn = cn->hprev;
1212 }
1213 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214}
1215
Chris Masona3172022006-09-29 01:59:56 -07001216static int newer_jl_done(struct reiserfs_journal_cnode *cn)
1217{
1218 struct super_block *sb = cn->sb;
1219 b_blocknr_t blocknr = cn->blocknr;
1220
1221 cn = cn->hprev;
1222 while (cn) {
1223 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist &&
1224 atomic_read(&cn->jlist->j_commit_left) != 0)
1225 return 0;
1226 cn = cn->hprev;
1227 }
1228 return 1;
1229}
1230
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001231static void remove_journal_hash(struct super_block *,
1232 struct reiserfs_journal_cnode **,
1233 struct reiserfs_journal_list *, unsigned long,
1234 int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235
1236/*
1237** once all the real blocks have been flushed, it is safe to remove them from the
1238** journal list for this transaction. Aside from freeing the cnode, this also allows the
1239** block to be reallocated for data blocks if it had been deleted.
1240*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001241static void remove_all_from_journal_list(struct super_block *p_s_sb,
1242 struct reiserfs_journal_list *jl,
1243 int debug)
1244{
1245 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
1246 struct reiserfs_journal_cnode *cn, *last;
1247 cn = jl->j_realblock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001249 /* which is better, to lock once around the whole loop, or
1250 ** to lock for each call to remove_journal_hash?
1251 */
1252 while (cn) {
1253 if (cn->blocknr != 0) {
1254 if (debug) {
1255 reiserfs_warning(p_s_sb,
1256 "block %u, bh is %d, state %ld",
1257 cn->blocknr, cn->bh ? 1 : 0,
1258 cn->state);
1259 }
1260 cn->state = 0;
1261 remove_journal_hash(p_s_sb, journal->j_list_hash_table,
1262 jl, cn->blocknr, 1);
1263 }
1264 last = cn;
1265 cn = cn->next;
1266 free_cnode(p_s_sb, last);
1267 }
1268 jl->j_realblock = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269}
1270
1271/*
1272** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block.
1273** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start
1274** releasing blocks in this transaction for reuse as data blocks.
1275** called by flush_journal_list, before it calls remove_all_from_journal_list
1276**
1277*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001278static int _update_journal_header_block(struct super_block *p_s_sb,
1279 unsigned long offset,
1280 unsigned long trans_id)
1281{
1282 struct reiserfs_journal_header *jh;
1283 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001285 if (reiserfs_is_journal_aborted(journal))
1286 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001288 if (trans_id >= journal->j_last_flush_trans_id) {
1289 if (buffer_locked((journal->j_header_bh))) {
1290 wait_on_buffer((journal->j_header_bh));
1291 if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001293 reiserfs_warning(p_s_sb,
1294 "journal-699: buffer write failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001296 return -EIO;
1297 }
1298 }
1299 journal->j_last_flush_trans_id = trans_id;
1300 journal->j_first_unflushed_offset = offset;
1301 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1302 b_data);
1303 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1304 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1305 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001307 if (reiserfs_barrier_flush(p_s_sb)) {
1308 int ret;
1309 lock_buffer(journal->j_header_bh);
1310 ret = submit_barrier_buffer(journal->j_header_bh);
1311 if (ret == -EOPNOTSUPP) {
1312 set_buffer_uptodate(journal->j_header_bh);
1313 disable_barrier(p_s_sb);
1314 goto sync;
1315 }
1316 wait_on_buffer(journal->j_header_bh);
1317 check_barrier_completion(p_s_sb, journal->j_header_bh);
1318 } else {
1319 sync:
1320 set_buffer_dirty(journal->j_header_bh);
1321 sync_dirty_buffer(journal->j_header_bh);
1322 }
1323 if (!buffer_uptodate(journal->j_header_bh)) {
1324 reiserfs_warning(p_s_sb,
1325 "journal-837: IO error during journal replay");
1326 return -EIO;
1327 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001329 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330}
1331
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001332static int update_journal_header_block(struct super_block *p_s_sb,
1333 unsigned long offset,
1334 unsigned long trans_id)
1335{
1336 return _update_journal_header_block(p_s_sb, offset, trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001338
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339/*
1340** flush any and all journal lists older than you are
1341** can only be called from flush_journal_list
1342*/
1343static int flush_older_journal_lists(struct super_block *p_s_sb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001344 struct reiserfs_journal_list *jl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001346 struct list_head *entry;
1347 struct reiserfs_journal_list *other_jl;
1348 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
1349 unsigned long trans_id = jl->j_trans_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001351 /* we know we are the only ones flushing things, no extra race
1352 * protection is required.
1353 */
1354 restart:
1355 entry = journal->j_journal_list.next;
1356 /* Did we wrap? */
1357 if (entry == &journal->j_journal_list)
1358 return 0;
1359 other_jl = JOURNAL_LIST_ENTRY(entry);
1360 if (other_jl->j_trans_id < trans_id) {
1361 BUG_ON(other_jl->j_refcount <= 0);
1362 /* do not flush all */
1363 flush_journal_list(p_s_sb, other_jl, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001365 /* other_jl is now deleted from the list */
1366 goto restart;
1367 }
1368 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369}
1370
1371static void del_from_work_list(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001372 struct reiserfs_journal_list *jl)
1373{
1374 struct reiserfs_journal *journal = SB_JOURNAL(s);
1375 if (!list_empty(&jl->j_working_list)) {
1376 list_del_init(&jl->j_working_list);
1377 journal->j_num_work_lists--;
1378 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379}
1380
1381/* flush a journal list, both commit and real blocks
1382**
1383** always set flushall to 1, unless you are calling from inside
1384** flush_journal_list
1385**
1386** IMPORTANT. This can only be called while there are no journal writers,
1387** and the journal is locked. That means it can only be called from
1388** do_journal_end, or by journal_release
1389*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001390static int flush_journal_list(struct super_block *s,
1391 struct reiserfs_journal_list *jl, int flushall)
1392{
1393 struct reiserfs_journal_list *pjl;
1394 struct reiserfs_journal_cnode *cn, *last;
1395 int count;
1396 int was_jwait = 0;
1397 int was_dirty = 0;
1398 struct buffer_head *saved_bh;
1399 unsigned long j_len_saved = jl->j_len;
1400 struct reiserfs_journal *journal = SB_JOURNAL(s);
1401 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001403 BUG_ON(j_len_saved <= 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001405 if (atomic_read(&journal->j_wcount) != 0) {
1406 reiserfs_warning(s,
1407 "clm-2048: flush_journal_list called with wcount %d",
1408 atomic_read(&journal->j_wcount));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001410 BUG_ON(jl->j_trans_id == 0);
1411
1412 /* if flushall == 0, the lock is already held */
1413 if (flushall) {
1414 down(&journal->j_flush_sem);
1415 } else if (!down_trylock(&journal->j_flush_sem)) {
1416 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001418
1419 count = 0;
1420 if (j_len_saved > journal->j_trans_max) {
1421 reiserfs_panic(s,
1422 "journal-715: flush_journal_list, length is %lu, trans id %lu\n",
1423 j_len_saved, jl->j_trans_id);
1424 return 0;
1425 }
1426
1427 get_fs_excl();
1428
1429 /* if all the work is already done, get out of here */
1430 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1431 atomic_read(&(jl->j_commit_left)) <= 0) {
1432 goto flush_older_and_return;
1433 }
1434
1435 /* start by putting the commit list on disk. This will also flush
1436 ** the commit lists of any olders transactions
1437 */
1438 flush_commit_list(s, jl, 1);
1439
1440 if (!(jl->j_state & LIST_DIRTY)
1441 && !reiserfs_is_journal_aborted(journal))
1442 BUG();
1443
1444 /* are we done now? */
1445 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1446 atomic_read(&(jl->j_commit_left)) <= 0) {
1447 goto flush_older_and_return;
1448 }
1449
1450 /* loop through each cnode, see if we need to write it,
1451 ** or wait on a more recent transaction, or just ignore it
1452 */
1453 if (atomic_read(&(journal->j_wcount)) != 0) {
1454 reiserfs_panic(s,
1455 "journal-844: panic journal list is flushing, wcount is not 0\n");
1456 }
1457 cn = jl->j_realblock;
1458 while (cn) {
1459 was_jwait = 0;
1460 was_dirty = 0;
1461 saved_bh = NULL;
1462 /* blocknr of 0 is no longer in the hash, ignore it */
1463 if (cn->blocknr == 0) {
1464 goto free_cnode;
1465 }
1466
1467 /* This transaction failed commit. Don't write out to the disk */
1468 if (!(jl->j_state & LIST_DIRTY))
1469 goto free_cnode;
1470
1471 pjl = find_newer_jl_for_cn(cn);
1472 /* the order is important here. We check pjl to make sure we
1473 ** don't clear BH_JDirty_wait if we aren't the one writing this
1474 ** block to disk
1475 */
1476 if (!pjl && cn->bh) {
1477 saved_bh = cn->bh;
1478
1479 /* we do this to make sure nobody releases the buffer while
1480 ** we are working with it
1481 */
1482 get_bh(saved_bh);
1483
1484 if (buffer_journal_dirty(saved_bh)) {
1485 BUG_ON(!can_dirty(cn));
1486 was_jwait = 1;
1487 was_dirty = 1;
1488 } else if (can_dirty(cn)) {
1489 /* everything with !pjl && jwait should be writable */
1490 BUG();
1491 }
1492 }
1493
1494 /* if someone has this block in a newer transaction, just make
Matt LaPlante0779bf22006-11-30 05:24:39 +01001495 ** sure they are committed, and don't try writing it to disk
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001496 */
1497 if (pjl) {
1498 if (atomic_read(&pjl->j_commit_left))
1499 flush_commit_list(s, pjl, 1);
1500 goto free_cnode;
1501 }
1502
1503 /* bh == NULL when the block got to disk on its own, OR,
1504 ** the block got freed in a future transaction
1505 */
1506 if (saved_bh == NULL) {
1507 goto free_cnode;
1508 }
1509
1510 /* this should never happen. kupdate_one_transaction has this list
1511 ** locked while it works, so we should never see a buffer here that
1512 ** is not marked JDirty_wait
1513 */
1514 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1515 reiserfs_warning(s,
1516 "journal-813: BAD! buffer %llu %cdirty %cjwait, "
1517 "not in a newer tranasction",
1518 (unsigned long long)saved_bh->
1519 b_blocknr, was_dirty ? ' ' : '!',
1520 was_jwait ? ' ' : '!');
1521 }
1522 if (was_dirty) {
1523 /* we inc again because saved_bh gets decremented at free_cnode */
1524 get_bh(saved_bh);
1525 set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1526 lock_buffer(saved_bh);
1527 BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1528 if (buffer_dirty(saved_bh))
1529 submit_logged_buffer(saved_bh);
1530 else
1531 unlock_buffer(saved_bh);
1532 count++;
1533 } else {
1534 reiserfs_warning(s,
1535 "clm-2082: Unable to flush buffer %llu in %s",
1536 (unsigned long long)saved_bh->
1537 b_blocknr, __FUNCTION__);
1538 }
1539 free_cnode:
1540 last = cn;
1541 cn = cn->next;
1542 if (saved_bh) {
1543 /* we incremented this to keep others from taking the buffer head away */
1544 put_bh(saved_bh);
1545 if (atomic_read(&(saved_bh->b_count)) < 0) {
1546 reiserfs_warning(s,
1547 "journal-945: saved_bh->b_count < 0");
1548 }
1549 }
1550 }
1551 if (count > 0) {
1552 cn = jl->j_realblock;
1553 while (cn) {
1554 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1555 if (!cn->bh) {
1556 reiserfs_panic(s,
1557 "journal-1011: cn->bh is NULL\n");
1558 }
1559 wait_on_buffer(cn->bh);
1560 if (!cn->bh) {
1561 reiserfs_panic(s,
1562 "journal-1012: cn->bh is NULL\n");
1563 }
1564 if (unlikely(!buffer_uptodate(cn->bh))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001566 reiserfs_warning(s,
1567 "journal-949: buffer write failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001569 err = -EIO;
1570 }
1571 /* note, we must clear the JDirty_wait bit after the up to date
1572 ** check, otherwise we race against our flushpage routine
1573 */
1574 BUG_ON(!test_clear_buffer_journal_dirty
1575 (cn->bh));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576
Chris Mason398c95b2007-10-16 23:29:44 -07001577 /* drop one ref for us */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001578 put_bh(cn->bh);
Chris Mason398c95b2007-10-16 23:29:44 -07001579 /* drop one ref for journal_mark_dirty */
1580 release_buffer_page(cn->bh);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001581 }
1582 cn = cn->next;
1583 }
1584 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001586 if (err)
1587 reiserfs_abort(s, -EIO,
1588 "Write error while pushing transaction to disk in %s",
1589 __FUNCTION__);
1590 flush_older_and_return:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001592 /* before we can update the journal header block, we _must_ flush all
1593 ** real blocks from all older transactions to disk. This is because
1594 ** once the header block is updated, this transaction will not be
1595 ** replayed after a crash
1596 */
1597 if (flushall) {
1598 flush_older_journal_lists(s, jl);
1599 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001601 err = journal->j_errno;
1602 /* before we can remove everything from the hash tables for this
1603 ** transaction, we must make sure it can never be replayed
1604 **
1605 ** since we are only called from do_journal_end, we know for sure there
1606 ** are no allocations going on while we are flushing journal lists. So,
1607 ** we only need to update the journal header block for the last list
1608 ** being flushed
1609 */
1610 if (!err && flushall) {
1611 err =
1612 update_journal_header_block(s,
1613 (jl->j_start + jl->j_len +
1614 2) % SB_ONDISK_JOURNAL_SIZE(s),
1615 jl->j_trans_id);
1616 if (err)
1617 reiserfs_abort(s, -EIO,
1618 "Write error while updating journal header in %s",
1619 __FUNCTION__);
1620 }
1621 remove_all_from_journal_list(s, jl, 0);
1622 list_del_init(&jl->j_list);
1623 journal->j_num_lists--;
1624 del_from_work_list(s, jl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001626 if (journal->j_last_flush_id != 0 &&
1627 (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1628 reiserfs_warning(s, "clm-2201: last flush %lu, current %lu",
1629 journal->j_last_flush_id, jl->j_trans_id);
1630 }
1631 journal->j_last_flush_id = jl->j_trans_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001633 /* not strictly required since we are freeing the list, but it should
1634 * help find code using dead lists later on
1635 */
1636 jl->j_len = 0;
1637 atomic_set(&(jl->j_nonzerolen), 0);
1638 jl->j_start = 0;
1639 jl->j_realblock = NULL;
1640 jl->j_commit_bh = NULL;
1641 jl->j_trans_id = 0;
1642 jl->j_state = 0;
1643 put_journal_list(s, jl);
1644 if (flushall)
1645 up(&journal->j_flush_sem);
1646 put_fs_excl();
1647 return err;
1648}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649
Chris Masona3172022006-09-29 01:59:56 -07001650static int test_transaction(struct super_block *s,
1651 struct reiserfs_journal_list *jl)
1652{
1653 struct reiserfs_journal_cnode *cn;
1654
1655 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0)
1656 return 1;
1657
1658 cn = jl->j_realblock;
1659 while (cn) {
1660 /* if the blocknr == 0, this has been cleared from the hash,
1661 ** skip it
1662 */
1663 if (cn->blocknr == 0) {
1664 goto next;
1665 }
1666 if (cn->bh && !newer_jl_done(cn))
1667 return 0;
1668 next:
1669 cn = cn->next;
1670 cond_resched();
1671 }
1672 return 0;
1673}
1674
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675static int write_one_transaction(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001676 struct reiserfs_journal_list *jl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001677 struct buffer_chunk *chunk)
1678{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001679 struct reiserfs_journal_cnode *cn;
1680 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001682 jl->j_state |= LIST_TOUCHED;
1683 del_from_work_list(s, jl);
1684 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1685 return 0;
1686 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001688 cn = jl->j_realblock;
1689 while (cn) {
1690 /* if the blocknr == 0, this has been cleared from the hash,
1691 ** skip it
1692 */
1693 if (cn->blocknr == 0) {
1694 goto next;
1695 }
1696 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1697 struct buffer_head *tmp_bh;
1698 /* we can race against journal_mark_freed when we try
1699 * to lock_buffer(cn->bh), so we have to inc the buffer
1700 * count, and recheck things after locking
1701 */
1702 tmp_bh = cn->bh;
1703 get_bh(tmp_bh);
1704 lock_buffer(tmp_bh);
1705 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1706 if (!buffer_journal_dirty(tmp_bh) ||
1707 buffer_journal_prepared(tmp_bh))
1708 BUG();
1709 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1710 ret++;
1711 } else {
1712 /* note, cn->bh might be null now */
1713 unlock_buffer(tmp_bh);
1714 }
1715 put_bh(tmp_bh);
1716 }
1717 next:
1718 cn = cn->next;
1719 cond_resched();
1720 }
1721 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722}
1723
1724/* used by flush_commit_list */
1725static int dirty_one_transaction(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001726 struct reiserfs_journal_list *jl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001728 struct reiserfs_journal_cnode *cn;
1729 struct reiserfs_journal_list *pjl;
1730 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001732 jl->j_state |= LIST_DIRTY;
1733 cn = jl->j_realblock;
1734 while (cn) {
1735 /* look for a more recent transaction that logged this
1736 ** buffer. Only the most recent transaction with a buffer in
1737 ** it is allowed to send that buffer to disk
1738 */
1739 pjl = find_newer_jl_for_cn(cn);
1740 if (!pjl && cn->blocknr && cn->bh
1741 && buffer_journal_dirty(cn->bh)) {
1742 BUG_ON(!can_dirty(cn));
1743 /* if the buffer is prepared, it will either be logged
1744 * or restored. If restored, we need to make sure
1745 * it actually gets marked dirty
1746 */
1747 clear_buffer_journal_new(cn->bh);
1748 if (buffer_journal_prepared(cn->bh)) {
1749 set_buffer_journal_restore_dirty(cn->bh);
1750 } else {
1751 set_buffer_journal_test(cn->bh);
1752 mark_buffer_dirty(cn->bh);
1753 }
1754 }
1755 cn = cn->next;
1756 }
1757 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758}
1759
1760static int kupdate_transactions(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001761 struct reiserfs_journal_list *jl,
1762 struct reiserfs_journal_list **next_jl,
1763 unsigned long *next_trans_id,
1764 int num_blocks, int num_trans)
1765{
1766 int ret = 0;
1767 int written = 0;
1768 int transactions_flushed = 0;
1769 unsigned long orig_trans_id = jl->j_trans_id;
1770 struct buffer_chunk chunk;
1771 struct list_head *entry;
1772 struct reiserfs_journal *journal = SB_JOURNAL(s);
1773 chunk.nr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001774
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001775 down(&journal->j_flush_sem);
1776 if (!journal_list_still_alive(s, orig_trans_id)) {
1777 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001779
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001780 /* we've got j_flush_sem held, nobody is going to delete any
1781 * of these lists out from underneath us
1782 */
1783 while ((num_trans && transactions_flushed < num_trans) ||
1784 (!num_trans && written < num_blocks)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001786 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1787 atomic_read(&jl->j_commit_left)
1788 || !(jl->j_state & LIST_DIRTY)) {
1789 del_from_work_list(s, jl);
1790 break;
1791 }
1792 ret = write_one_transaction(s, jl, &chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001794 if (ret < 0)
1795 goto done;
1796 transactions_flushed++;
1797 written += ret;
1798 entry = jl->j_list.next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001800 /* did we wrap? */
1801 if (entry == &journal->j_journal_list) {
1802 break;
1803 }
1804 jl = JOURNAL_LIST_ENTRY(entry);
1805
1806 /* don't bother with older transactions */
1807 if (jl->j_trans_id <= orig_trans_id)
1808 break;
1809 }
1810 if (chunk.nr) {
1811 write_chunk(&chunk);
1812 }
1813
1814 done:
1815 up(&journal->j_flush_sem);
1816 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817}
1818
1819/* for o_sync and fsync heavy applications, they tend to use
1820** all the journa list slots with tiny transactions. These
1821** trigger lots and lots of calls to update the header block, which
1822** adds seeks and slows things down.
1823**
1824** This function tries to clear out a large chunk of the journal lists
1825** at once, which makes everything faster since only the newest journal
1826** list updates the header block
1827*/
1828static int flush_used_journal_lists(struct super_block *s,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001829 struct reiserfs_journal_list *jl)
1830{
1831 unsigned long len = 0;
1832 unsigned long cur_len;
1833 int ret;
1834 int i;
1835 int limit = 256;
1836 struct reiserfs_journal_list *tjl;
1837 struct reiserfs_journal_list *flush_jl;
1838 unsigned long trans_id;
1839 struct reiserfs_journal *journal = SB_JOURNAL(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001841 flush_jl = tjl = jl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001843 /* in data logging mode, try harder to flush a lot of blocks */
1844 if (reiserfs_data_log(s))
1845 limit = 1024;
1846 /* flush for 256 transactions or limit blocks, whichever comes first */
1847 for (i = 0; i < 256 && len < limit; i++) {
1848 if (atomic_read(&tjl->j_commit_left) ||
1849 tjl->j_trans_id < jl->j_trans_id) {
1850 break;
1851 }
1852 cur_len = atomic_read(&tjl->j_nonzerolen);
1853 if (cur_len > 0) {
1854 tjl->j_state &= ~LIST_TOUCHED;
1855 }
1856 len += cur_len;
1857 flush_jl = tjl;
1858 if (tjl->j_list.next == &journal->j_journal_list)
1859 break;
1860 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001862 /* try to find a group of blocks we can flush across all the
1863 ** transactions, but only bother if we've actually spanned
1864 ** across multiple lists
1865 */
1866 if (flush_jl != jl) {
1867 ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001868 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001869 flush_journal_list(s, flush_jl, 1);
1870 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871}
1872
1873/*
1874** removes any nodes in table with name block and dev as bh.
1875** only touchs the hnext and hprev pointers.
1876*/
1877void remove_journal_hash(struct super_block *sb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001878 struct reiserfs_journal_cnode **table,
1879 struct reiserfs_journal_list *jl,
1880 unsigned long block, int remove_freed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001882 struct reiserfs_journal_cnode *cur;
1883 struct reiserfs_journal_cnode **head;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001885 head = &(journal_hash(table, sb, block));
1886 if (!head) {
1887 return;
1888 }
1889 cur = *head;
1890 while (cur) {
1891 if (cur->blocknr == block && cur->sb == sb
1892 && (jl == NULL || jl == cur->jlist)
1893 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1894 if (cur->hnext) {
1895 cur->hnext->hprev = cur->hprev;
1896 }
1897 if (cur->hprev) {
1898 cur->hprev->hnext = cur->hnext;
1899 } else {
1900 *head = cur->hnext;
1901 }
1902 cur->blocknr = 0;
1903 cur->sb = NULL;
1904 cur->state = 0;
1905 if (cur->bh && cur->jlist) /* anybody who clears the cur->bh will also dec the nonzerolen */
1906 atomic_dec(&(cur->jlist->j_nonzerolen));
1907 cur->bh = NULL;
1908 cur->jlist = NULL;
1909 }
1910 cur = cur->hnext;
1911 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912}
1913
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001914static void free_journal_ram(struct super_block *p_s_sb)
1915{
1916 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
Pekka Enbergd739b422006-02-01 03:06:43 -08001917 kfree(journal->j_current_jl);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001918 journal->j_num_lists--;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001920 vfree(journal->j_cnode_free_orig);
1921 free_list_bitmaps(p_s_sb, journal->j_list_bitmap);
1922 free_bitmap_nodes(p_s_sb); /* must be after free_list_bitmaps */
1923 if (journal->j_header_bh) {
1924 brelse(journal->j_header_bh);
1925 }
1926 /* j_header_bh is on the journal dev, make sure not to release the journal
1927 * dev until we brelse j_header_bh
1928 */
1929 release_journal_dev(p_s_sb, journal);
1930 vfree(journal);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931}
1932
1933/*
1934** call on unmount. Only set error to 1 if you haven't made your way out
1935** of read_super() yet. Any other caller must keep error at 0.
1936*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001937static int do_journal_release(struct reiserfs_transaction_handle *th,
1938 struct super_block *p_s_sb, int error)
1939{
1940 struct reiserfs_transaction_handle myth;
1941 int flushed = 0;
1942 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001944 /* we only want to flush out transactions if we were called with error == 0
1945 */
1946 if (!error && !(p_s_sb->s_flags & MS_RDONLY)) {
1947 /* end the current trans */
1948 BUG_ON(!th->t_trans_id);
1949 do_journal_end(th, p_s_sb, 10, FLUSH_ALL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001951 /* make sure something gets logged to force our way into the flush code */
1952 if (!journal_join(&myth, p_s_sb, 1)) {
1953 reiserfs_prepare_for_journal(p_s_sb,
1954 SB_BUFFER_WITH_SB(p_s_sb),
1955 1);
1956 journal_mark_dirty(&myth, p_s_sb,
1957 SB_BUFFER_WITH_SB(p_s_sb));
1958 do_journal_end(&myth, p_s_sb, 1, FLUSH_ALL);
1959 flushed = 1;
1960 }
1961 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001963 /* this also catches errors during the do_journal_end above */
1964 if (!error && reiserfs_is_journal_aborted(journal)) {
1965 memset(&myth, 0, sizeof(myth));
1966 if (!journal_join_abort(&myth, p_s_sb, 1)) {
1967 reiserfs_prepare_for_journal(p_s_sb,
1968 SB_BUFFER_WITH_SB(p_s_sb),
1969 1);
1970 journal_mark_dirty(&myth, p_s_sb,
1971 SB_BUFFER_WITH_SB(p_s_sb));
1972 do_journal_end(&myth, p_s_sb, 1, FLUSH_ALL);
1973 }
1974 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001976 reiserfs_mounted_fs_count--;
1977 /* wait for all commits to finish */
1978 cancel_delayed_work(&SB_JOURNAL(p_s_sb)->j_work);
1979 flush_workqueue(commit_wq);
1980 if (!reiserfs_mounted_fs_count) {
1981 destroy_workqueue(commit_wq);
1982 commit_wq = NULL;
1983 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001984
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001985 free_journal_ram(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001986
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001987 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988}
1989
1990/*
1991** call on unmount. flush all journal trans, release all alloc'd ram
1992*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001993int journal_release(struct reiserfs_transaction_handle *th,
1994 struct super_block *p_s_sb)
1995{
1996 return do_journal_release(th, p_s_sb, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001998
Linus Torvalds1da177e2005-04-16 15:20:36 -07001999/*
2000** only call from an error condition inside reiserfs_read_super!
2001*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002002int journal_release_error(struct reiserfs_transaction_handle *th,
2003 struct super_block *p_s_sb)
2004{
2005 return do_journal_release(th, p_s_sb, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002006}
2007
2008/* compares description block with commit block. returns 1 if they differ, 0 if they are the same */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002009static int journal_compare_desc_commit(struct super_block *p_s_sb,
2010 struct reiserfs_journal_desc *desc,
2011 struct reiserfs_journal_commit *commit)
2012{
2013 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
2014 get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
2015 get_commit_trans_len(commit) > SB_JOURNAL(p_s_sb)->j_trans_max ||
2016 get_commit_trans_len(commit) <= 0) {
2017 return 1;
2018 }
2019 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002021
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022/* returns 0 if it did not find a description block
2023** returns -1 if it found a corrupt commit block
2024** returns 1 if both desc and commit were valid
2025*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002026static int journal_transaction_is_valid(struct super_block *p_s_sb,
2027 struct buffer_head *d_bh,
2028 unsigned long *oldest_invalid_trans_id,
2029 unsigned long *newest_mount_id)
2030{
2031 struct reiserfs_journal_desc *desc;
2032 struct reiserfs_journal_commit *commit;
2033 struct buffer_head *c_bh;
2034 unsigned long offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002035
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002036 if (!d_bh)
2037 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002039 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2040 if (get_desc_trans_len(desc) > 0
2041 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2042 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2043 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2044 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2045 "journal-986: transaction "
2046 "is valid returning because trans_id %d is greater than "
2047 "oldest_invalid %lu",
2048 get_desc_trans_id(desc),
2049 *oldest_invalid_trans_id);
2050 return 0;
2051 }
2052 if (newest_mount_id
2053 && *newest_mount_id > get_desc_mount_id(desc)) {
2054 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2055 "journal-1087: transaction "
2056 "is valid returning because mount_id %d is less than "
2057 "newest_mount_id %lu",
2058 get_desc_mount_id(desc),
2059 *newest_mount_id);
2060 return -1;
2061 }
2062 if (get_desc_trans_len(desc) > SB_JOURNAL(p_s_sb)->j_trans_max) {
2063 reiserfs_warning(p_s_sb,
2064 "journal-2018: Bad transaction length %d encountered, ignoring transaction",
2065 get_desc_trans_len(desc));
2066 return -1;
2067 }
2068 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002069
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002070 /* ok, we have a journal description block, lets see if the transaction was valid */
2071 c_bh =
2072 journal_bread(p_s_sb,
2073 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2074 ((offset + get_desc_trans_len(desc) +
2075 1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
2076 if (!c_bh)
2077 return 0;
2078 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2079 if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
2080 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2081 "journal_transaction_is_valid, commit offset %ld had bad "
2082 "time %d or length %d",
2083 c_bh->b_blocknr -
2084 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2085 get_commit_trans_id(commit),
2086 get_commit_trans_len(commit));
2087 brelse(c_bh);
2088 if (oldest_invalid_trans_id) {
2089 *oldest_invalid_trans_id =
2090 get_desc_trans_id(desc);
2091 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2092 "journal-1004: "
2093 "transaction_is_valid setting oldest invalid trans_id "
2094 "to %d",
2095 get_desc_trans_id(desc));
2096 }
2097 return -1;
2098 }
2099 brelse(c_bh);
2100 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2101 "journal-1006: found valid "
2102 "transaction start offset %llu, len %d id %d",
2103 d_bh->b_blocknr -
2104 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2105 get_desc_trans_len(desc),
2106 get_desc_trans_id(desc));
2107 return 1;
2108 } else {
2109 return 0;
2110 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002111}
2112
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002113static void brelse_array(struct buffer_head **heads, int num)
2114{
2115 int i;
2116 for (i = 0; i < num; i++) {
2117 brelse(heads[i]);
2118 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119}
2120
2121/*
2122** given the start, and values for the oldest acceptable transactions,
2123** this either reads in a replays a transaction, or returns because the transaction
2124** is invalid, or too old.
2125*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002126static int journal_read_transaction(struct super_block *p_s_sb,
2127 unsigned long cur_dblock,
2128 unsigned long oldest_start,
2129 unsigned long oldest_trans_id,
2130 unsigned long newest_mount_id)
2131{
2132 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
2133 struct reiserfs_journal_desc *desc;
2134 struct reiserfs_journal_commit *commit;
2135 unsigned long trans_id = 0;
2136 struct buffer_head *c_bh;
2137 struct buffer_head *d_bh;
2138 struct buffer_head **log_blocks = NULL;
2139 struct buffer_head **real_blocks = NULL;
2140 unsigned long trans_offset;
2141 int i;
2142 int trans_half;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002143
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002144 d_bh = journal_bread(p_s_sb, cur_dblock);
2145 if (!d_bh)
2146 return 1;
2147 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2148 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
2149 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1037: "
2150 "journal_read_transaction, offset %llu, len %d mount_id %d",
2151 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2152 get_desc_trans_len(desc), get_desc_mount_id(desc));
2153 if (get_desc_trans_id(desc) < oldest_trans_id) {
2154 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1039: "
2155 "journal_read_trans skipping because %lu is too old",
2156 cur_dblock -
2157 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb));
2158 brelse(d_bh);
2159 return 1;
2160 }
2161 if (get_desc_mount_id(desc) != newest_mount_id) {
2162 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1146: "
2163 "journal_read_trans skipping because %d is != "
2164 "newest_mount_id %lu", get_desc_mount_id(desc),
2165 newest_mount_id);
2166 brelse(d_bh);
2167 return 1;
2168 }
2169 c_bh = journal_bread(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2170 ((trans_offset + get_desc_trans_len(desc) + 1) %
2171 SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
2172 if (!c_bh) {
2173 brelse(d_bh);
2174 return 1;
2175 }
2176 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2177 if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
2178 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2179 "journal_read_transaction, "
2180 "commit offset %llu had bad time %d or length %d",
2181 c_bh->b_blocknr -
2182 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2183 get_commit_trans_id(commit),
2184 get_commit_trans_len(commit));
2185 brelse(c_bh);
2186 brelse(d_bh);
2187 return 1;
2188 }
2189 trans_id = get_desc_trans_id(desc);
2190 /* now we know we've got a good transaction, and it was inside the valid time ranges */
Pekka Enbergd739b422006-02-01 03:06:43 -08002191 log_blocks = kmalloc(get_desc_trans_len(desc) *
2192 sizeof(struct buffer_head *), GFP_NOFS);
2193 real_blocks = kmalloc(get_desc_trans_len(desc) *
2194 sizeof(struct buffer_head *), GFP_NOFS);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002195 if (!log_blocks || !real_blocks) {
2196 brelse(c_bh);
2197 brelse(d_bh);
Pekka Enbergd739b422006-02-01 03:06:43 -08002198 kfree(log_blocks);
2199 kfree(real_blocks);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002200 reiserfs_warning(p_s_sb,
2201 "journal-1169: kmalloc failed, unable to mount FS");
2202 return -1;
2203 }
2204 /* get all the buffer heads */
2205 trans_half = journal_trans_half(p_s_sb->s_blocksize);
2206 for (i = 0; i < get_desc_trans_len(desc); i++) {
2207 log_blocks[i] =
2208 journal_getblk(p_s_sb,
2209 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2210 (trans_offset + 1 +
2211 i) % SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2212 if (i < trans_half) {
2213 real_blocks[i] =
2214 sb_getblk(p_s_sb,
2215 le32_to_cpu(desc->j_realblock[i]));
2216 } else {
2217 real_blocks[i] =
2218 sb_getblk(p_s_sb,
2219 le32_to_cpu(commit->
2220 j_realblock[i - trans_half]));
2221 }
2222 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(p_s_sb)) {
2223 reiserfs_warning(p_s_sb,
2224 "journal-1207: REPLAY FAILURE fsck required! Block to replay is outside of filesystem");
2225 goto abort_replay;
2226 }
2227 /* make sure we don't try to replay onto log or reserved area */
2228 if (is_block_in_log_or_reserved_area
2229 (p_s_sb, real_blocks[i]->b_blocknr)) {
2230 reiserfs_warning(p_s_sb,
2231 "journal-1204: REPLAY FAILURE fsck required! Trying to replay onto a log block");
2232 abort_replay:
2233 brelse_array(log_blocks, i);
2234 brelse_array(real_blocks, i);
2235 brelse(c_bh);
2236 brelse(d_bh);
Pekka Enbergd739b422006-02-01 03:06:43 -08002237 kfree(log_blocks);
2238 kfree(real_blocks);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002239 return -1;
2240 }
2241 }
2242 /* read in the log blocks, memcpy to the corresponding real block */
2243 ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
2244 for (i = 0; i < get_desc_trans_len(desc); i++) {
2245 wait_on_buffer(log_blocks[i]);
2246 if (!buffer_uptodate(log_blocks[i])) {
2247 reiserfs_warning(p_s_sb,
2248 "journal-1212: REPLAY FAILURE fsck required! buffer write failed");
2249 brelse_array(log_blocks + i,
2250 get_desc_trans_len(desc) - i);
2251 brelse_array(real_blocks, get_desc_trans_len(desc));
2252 brelse(c_bh);
2253 brelse(d_bh);
Pekka Enbergd739b422006-02-01 03:06:43 -08002254 kfree(log_blocks);
2255 kfree(real_blocks);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002256 return -1;
2257 }
2258 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2259 real_blocks[i]->b_size);
2260 set_buffer_uptodate(real_blocks[i]);
2261 brelse(log_blocks[i]);
2262 }
2263 /* flush out the real blocks */
2264 for (i = 0; i < get_desc_trans_len(desc); i++) {
2265 set_buffer_dirty(real_blocks[i]);
Jan Kara53778ff2005-09-06 15:19:14 -07002266 ll_rw_block(SWRITE, 1, real_blocks + i);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002267 }
2268 for (i = 0; i < get_desc_trans_len(desc); i++) {
2269 wait_on_buffer(real_blocks[i]);
2270 if (!buffer_uptodate(real_blocks[i])) {
2271 reiserfs_warning(p_s_sb,
2272 "journal-1226: REPLAY FAILURE, fsck required! buffer write failed");
2273 brelse_array(real_blocks + i,
2274 get_desc_trans_len(desc) - i);
2275 brelse(c_bh);
2276 brelse(d_bh);
Pekka Enbergd739b422006-02-01 03:06:43 -08002277 kfree(log_blocks);
2278 kfree(real_blocks);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002279 return -1;
2280 }
2281 brelse(real_blocks[i]);
2282 }
2283 cur_dblock =
2284 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2285 ((trans_offset + get_desc_trans_len(desc) +
2286 2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2287 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2288 "journal-1095: setting journal " "start to offset %ld",
2289 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb));
2290
2291 /* init starting values for the first transaction, in case this is the last transaction to be replayed. */
2292 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
2293 journal->j_last_flush_trans_id = trans_id;
2294 journal->j_trans_id = trans_id + 1;
Alexander Zarochentseva44c94a2006-03-25 03:06:59 -08002295 /* check for trans_id overflow */
2296 if (journal->j_trans_id == 0)
2297 journal->j_trans_id = 10;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002298 brelse(c_bh);
2299 brelse(d_bh);
Pekka Enbergd739b422006-02-01 03:06:43 -08002300 kfree(log_blocks);
2301 kfree(real_blocks);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002302 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002303}
2304
2305/* This function reads blocks starting from block and to max_block of bufsize
2306 size (but no more than BUFNR blocks at a time). This proved to improve
2307 mounting speed on self-rebuilding raid5 arrays at least.
2308 Right now it is only used from journal code. But later we might use it
2309 from other places.
2310 Note: Do not use journal_getblk/sb_getblk functions here! */
Jeff Mahoney3ee16672007-10-18 23:39:25 -07002311static struct buffer_head *reiserfs_breada(struct block_device *dev,
2312 b_blocknr_t block, int bufsize,
2313 b_blocknr_t max_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002314{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002315 struct buffer_head *bhlist[BUFNR];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002316 unsigned int blocks = BUFNR;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002317 struct buffer_head *bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002318 int i, j;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002319
2320 bh = __getblk(dev, block, bufsize);
2321 if (buffer_uptodate(bh))
2322 return (bh);
2323
Linus Torvalds1da177e2005-04-16 15:20:36 -07002324 if (block + BUFNR > max_block) {
2325 blocks = max_block - block;
2326 }
2327 bhlist[0] = bh;
2328 j = 1;
2329 for (i = 1; i < blocks; i++) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002330 bh = __getblk(dev, block + i, bufsize);
2331 if (buffer_uptodate(bh)) {
2332 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002333 break;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002334 } else
2335 bhlist[j++] = bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002336 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002337 ll_rw_block(READ, j, bhlist);
2338 for (i = 1; i < j; i++)
2339 brelse(bhlist[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340 bh = bhlist[0];
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002341 wait_on_buffer(bh);
2342 if (buffer_uptodate(bh))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002343 return bh;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002344 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002345 return NULL;
2346}
2347
2348/*
2349** read and replay the log
2350** on a clean unmount, the journal header's next unflushed pointer will be to an invalid
2351** transaction. This tests that before finding all the transactions in the log, which makes normal mount times fast.
2352**
2353** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid.
2354**
2355** On exit, it sets things up so the first transaction will work correctly.
2356*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002357static int journal_read(struct super_block *p_s_sb)
2358{
2359 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
2360 struct reiserfs_journal_desc *desc;
2361 unsigned long oldest_trans_id = 0;
2362 unsigned long oldest_invalid_trans_id = 0;
2363 time_t start;
2364 unsigned long oldest_start = 0;
2365 unsigned long cur_dblock = 0;
2366 unsigned long newest_mount_id = 9;
2367 struct buffer_head *d_bh;
2368 struct reiserfs_journal_header *jh;
2369 int valid_journal_header = 0;
2370 int replay_count = 0;
2371 int continue_replay = 1;
2372 int ret;
2373 char b[BDEVNAME_SIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002374
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002375 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
2376 reiserfs_info(p_s_sb, "checking transaction log (%s)\n",
2377 bdevname(journal->j_dev_bd, b));
2378 start = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002379
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002380 /* step 1, read in the journal header block. Check the transaction it says
2381 ** is the first unflushed, and if that transaction is not valid,
2382 ** replay is done
2383 */
2384 journal->j_header_bh = journal_bread(p_s_sb,
2385 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb)
2386 + SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2387 if (!journal->j_header_bh) {
2388 return 1;
2389 }
2390 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
Vladimir V. Savelievc499ec22006-03-02 02:54:39 -08002391 if (le32_to_cpu(jh->j_first_unflushed_offset) <
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002392 SB_ONDISK_JOURNAL_SIZE(p_s_sb)
2393 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2394 oldest_start =
2395 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2396 le32_to_cpu(jh->j_first_unflushed_offset);
2397 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2398 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2399 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2400 "journal-1153: found in "
2401 "header: first_unflushed_offset %d, last_flushed_trans_id "
2402 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2403 le32_to_cpu(jh->j_last_flush_trans_id));
2404 valid_journal_header = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002405
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002406 /* now, we try to read the first unflushed offset. If it is not valid,
2407 ** there is nothing more we can do, and it makes no sense to read
2408 ** through the whole log.
2409 */
2410 d_bh =
2411 journal_bread(p_s_sb,
2412 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2413 le32_to_cpu(jh->j_first_unflushed_offset));
2414 ret = journal_transaction_is_valid(p_s_sb, d_bh, NULL, NULL);
2415 if (!ret) {
2416 continue_replay = 0;
2417 }
2418 brelse(d_bh);
2419 goto start_log_replay;
2420 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002421
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002422 if (continue_replay && bdev_read_only(p_s_sb->s_bdev)) {
2423 reiserfs_warning(p_s_sb,
2424 "clm-2076: device is readonly, unable to replay log");
2425 return -1;
2426 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002427
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002428 /* ok, there are transactions that need to be replayed. start with the first log block, find
2429 ** all the valid transactions, and pick out the oldest.
2430 */
2431 while (continue_replay
2432 && cur_dblock <
2433 (SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2434 SB_ONDISK_JOURNAL_SIZE(p_s_sb))) {
2435 /* Note that it is required for blocksize of primary fs device and journal
2436 device to be the same */
2437 d_bh =
2438 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2439 p_s_sb->s_blocksize,
2440 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2441 SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2442 ret =
2443 journal_transaction_is_valid(p_s_sb, d_bh,
2444 &oldest_invalid_trans_id,
2445 &newest_mount_id);
2446 if (ret == 1) {
2447 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2448 if (oldest_start == 0) { /* init all oldest_ values */
2449 oldest_trans_id = get_desc_trans_id(desc);
2450 oldest_start = d_bh->b_blocknr;
2451 newest_mount_id = get_desc_mount_id(desc);
2452 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2453 "journal-1179: Setting "
2454 "oldest_start to offset %llu, trans_id %lu",
2455 oldest_start -
2456 SB_ONDISK_JOURNAL_1st_BLOCK
2457 (p_s_sb), oldest_trans_id);
2458 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2459 /* one we just read was older */
2460 oldest_trans_id = get_desc_trans_id(desc);
2461 oldest_start = d_bh->b_blocknr;
2462 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2463 "journal-1180: Resetting "
2464 "oldest_start to offset %lu, trans_id %lu",
2465 oldest_start -
2466 SB_ONDISK_JOURNAL_1st_BLOCK
2467 (p_s_sb), oldest_trans_id);
2468 }
2469 if (newest_mount_id < get_desc_mount_id(desc)) {
2470 newest_mount_id = get_desc_mount_id(desc);
2471 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2472 "journal-1299: Setting "
2473 "newest_mount_id to %d",
2474 get_desc_mount_id(desc));
2475 }
2476 cur_dblock += get_desc_trans_len(desc) + 2;
2477 } else {
2478 cur_dblock++;
2479 }
2480 brelse(d_bh);
2481 }
2482
2483 start_log_replay:
2484 cur_dblock = oldest_start;
2485 if (oldest_trans_id) {
2486 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2487 "journal-1206: Starting replay "
2488 "from offset %llu, trans_id %lu",
2489 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2490 oldest_trans_id);
2491
2492 }
2493 replay_count = 0;
2494 while (continue_replay && oldest_trans_id > 0) {
2495 ret =
2496 journal_read_transaction(p_s_sb, cur_dblock, oldest_start,
2497 oldest_trans_id, newest_mount_id);
2498 if (ret < 0) {
2499 return ret;
2500 } else if (ret != 0) {
2501 break;
2502 }
2503 cur_dblock =
2504 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + journal->j_start;
2505 replay_count++;
2506 if (cur_dblock == oldest_start)
2507 break;
2508 }
2509
2510 if (oldest_trans_id == 0) {
2511 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2512 "journal-1225: No valid " "transactions found");
2513 }
2514 /* j_start does not get set correctly if we don't replay any transactions.
2515 ** if we had a valid journal_header, set j_start to the first unflushed transaction value,
2516 ** copy the trans_id from the header
2517 */
2518 if (valid_journal_header && replay_count == 0) {
2519 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2520 journal->j_trans_id =
2521 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
Alexander Zarochentseva44c94a2006-03-25 03:06:59 -08002522 /* check for trans_id overflow */
2523 if (journal->j_trans_id == 0)
2524 journal->j_trans_id = 10;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002525 journal->j_last_flush_trans_id =
2526 le32_to_cpu(jh->j_last_flush_trans_id);
2527 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2528 } else {
2529 journal->j_mount_id = newest_mount_id + 1;
2530 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002531 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002532 "newest_mount_id to %lu", journal->j_mount_id);
2533 journal->j_first_unflushed_offset = journal->j_start;
2534 if (replay_count > 0) {
2535 reiserfs_info(p_s_sb,
2536 "replayed %d transactions in %lu seconds\n",
2537 replay_count, get_seconds() - start);
2538 }
2539 if (!bdev_read_only(p_s_sb->s_bdev) &&
2540 _update_journal_header_block(p_s_sb, journal->j_start,
2541 journal->j_last_flush_trans_id)) {
2542 /* replay failed, caller must call free_journal_ram and abort
2543 ** the mount
2544 */
2545 return -1;
2546 }
2547 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002548}
2549
2550static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2551{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002552 struct reiserfs_journal_list *jl;
Pekka Enberg8c777cc2006-02-01 03:06:43 -08002553 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2554 GFP_NOFS | __GFP_NOFAIL);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002555 INIT_LIST_HEAD(&jl->j_list);
2556 INIT_LIST_HEAD(&jl->j_working_list);
2557 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2558 INIT_LIST_HEAD(&jl->j_bh_list);
2559 sema_init(&jl->j_commit_lock, 1);
2560 SB_JOURNAL(s)->j_num_lists++;
2561 get_journal_list(jl);
2562 return jl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002563}
2564
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002565static void journal_list_init(struct super_block *p_s_sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002566{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002567 SB_JOURNAL(p_s_sb)->j_current_jl = alloc_journal_list(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002568}
2569
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002570static int release_journal_dev(struct super_block *super,
2571 struct reiserfs_journal *journal)
2572{
2573 int result;
2574
2575 result = 0;
2576
2577 if (journal->j_dev_file != NULL) {
2578 result = filp_close(journal->j_dev_file, NULL);
2579 journal->j_dev_file = NULL;
2580 journal->j_dev_bd = NULL;
2581 } else if (journal->j_dev_bd != NULL) {
2582 result = blkdev_put(journal->j_dev_bd);
2583 journal->j_dev_bd = NULL;
2584 }
2585
2586 if (result != 0) {
2587 reiserfs_warning(super,
2588 "sh-457: release_journal_dev: Cannot release journal device: %i",
2589 result);
2590 }
2591 return result;
2592}
2593
2594static int journal_init_dev(struct super_block *super,
2595 struct reiserfs_journal *journal,
2596 const char *jdev_name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002597{
2598 int result;
2599 dev_t jdev;
2600 int blkdev_mode = FMODE_READ | FMODE_WRITE;
2601 char b[BDEVNAME_SIZE];
2602
2603 result = 0;
2604
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002605 journal->j_dev_bd = NULL;
2606 journal->j_dev_file = NULL;
2607 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2608 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002609
2610 if (bdev_read_only(super->s_bdev))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002611 blkdev_mode = FMODE_READ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002612
2613 /* there is no "jdev" option and journal is on separate device */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002614 if ((!jdev_name || !jdev_name[0])) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002615 journal->j_dev_bd = open_by_devnum(jdev, blkdev_mode);
2616 if (IS_ERR(journal->j_dev_bd)) {
2617 result = PTR_ERR(journal->j_dev_bd);
2618 journal->j_dev_bd = NULL;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002619 reiserfs_warning(super, "sh-458: journal_init_dev: "
2620 "cannot init journal device '%s': %i",
2621 __bdevname(jdev, b), result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002622 return result;
2623 } else if (jdev != super->s_dev)
2624 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2625 return 0;
2626 }
2627
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002628 journal->j_dev_file = filp_open(jdev_name, 0, 0);
2629 if (!IS_ERR(journal->j_dev_file)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002630 struct inode *jdev_inode = journal->j_dev_file->f_mapping->host;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002631 if (!S_ISBLK(jdev_inode->i_mode)) {
Edward Shishkin74f9f972005-05-01 08:59:09 -07002632 reiserfs_warning(super, "journal_init_dev: '%s' is "
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002633 "not a block device", jdev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002634 result = -ENOTBLK;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002635 release_journal_dev(super, journal);
2636 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002637 /* ok */
2638 journal->j_dev_bd = I_BDEV(jdev_inode);
2639 set_blocksize(journal->j_dev_bd, super->s_blocksize);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002640 reiserfs_info(super,
2641 "journal_init_dev: journal device: %s\n",
Edward Shishkin74f9f972005-05-01 08:59:09 -07002642 bdevname(journal->j_dev_bd, b));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002643 }
2644 } else {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002645 result = PTR_ERR(journal->j_dev_file);
2646 journal->j_dev_file = NULL;
2647 reiserfs_warning(super,
2648 "journal_init_dev: Cannot open '%s': %i",
2649 jdev_name, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002650 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002651 return result;
2652}
2653
Edward Shishkincf3d0b82007-10-16 23:30:30 -07002654/**
2655 * When creating/tuning a file system user can assign some
2656 * journal params within boundaries which depend on the ratio
2657 * blocksize/standard_blocksize.
2658 *
2659 * For blocks >= standard_blocksize transaction size should
2660 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2661 * then JOURNAL_TRANS_MAX_DEFAULT.
2662 *
2663 * For blocks < standard_blocksize these boundaries should be
2664 * decreased proportionally.
2665 */
2666#define REISERFS_STANDARD_BLKSIZE (4096)
2667
2668static int check_advise_trans_params(struct super_block *p_s_sb,
2669 struct reiserfs_journal *journal)
2670{
2671 if (journal->j_trans_max) {
2672 /* Non-default journal params.
2673 Do sanity check for them. */
2674 int ratio = 1;
2675 if (p_s_sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2676 ratio = REISERFS_STANDARD_BLKSIZE / p_s_sb->s_blocksize;
2677
2678 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2679 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2680 SB_ONDISK_JOURNAL_SIZE(p_s_sb) / journal->j_trans_max <
2681 JOURNAL_MIN_RATIO) {
2682 reiserfs_warning(p_s_sb,
2683 "sh-462: bad transaction max size (%u). FSCK?",
2684 journal->j_trans_max);
2685 return 1;
2686 }
2687 if (journal->j_max_batch != (journal->j_trans_max) *
2688 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2689 reiserfs_warning(p_s_sb,
2690 "sh-463: bad transaction max batch (%u). FSCK?",
2691 journal->j_max_batch);
2692 return 1;
2693 }
2694 } else {
2695 /* Default journal params.
2696 The file system was created by old version
2697 of mkreiserfs, so some fields contain zeros,
2698 and we need to advise proper values for them */
2699 if (p_s_sb->s_blocksize != REISERFS_STANDARD_BLKSIZE)
2700 reiserfs_panic(p_s_sb, "sh-464: bad blocksize (%u)",
2701 p_s_sb->s_blocksize);
2702 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2703 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2704 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2705 }
2706 return 0;
2707}
2708
Linus Torvalds1da177e2005-04-16 15:20:36 -07002709/*
2710** must be called once on fs mount. calls journal_read for you
2711*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002712int journal_init(struct super_block *p_s_sb, const char *j_dev_name,
2713 int old_format, unsigned int commit_max_age)
2714{
2715 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(p_s_sb) * 2;
2716 struct buffer_head *bhjh;
2717 struct reiserfs_super_block *rs;
2718 struct reiserfs_journal_header *jh;
2719 struct reiserfs_journal *journal;
2720 struct reiserfs_journal_list *jl;
2721 char b[BDEVNAME_SIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002722
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002723 journal = SB_JOURNAL(p_s_sb) = vmalloc(sizeof(struct reiserfs_journal));
2724 if (!journal) {
2725 reiserfs_warning(p_s_sb,
2726 "journal-1256: unable to get memory for journal structure");
2727 return 1;
2728 }
2729 memset(journal, 0, sizeof(struct reiserfs_journal));
2730 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2731 INIT_LIST_HEAD(&journal->j_prealloc_list);
2732 INIT_LIST_HEAD(&journal->j_working_list);
2733 INIT_LIST_HEAD(&journal->j_journal_list);
2734 journal->j_persistent_trans = 0;
2735 if (reiserfs_allocate_list_bitmaps(p_s_sb,
2736 journal->j_list_bitmap,
Jeff Mahoneycb680c12007-10-18 23:39:27 -07002737 reiserfs_bmap_count(p_s_sb)))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002738 goto free_and_return;
2739 allocate_bitmap_nodes(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002740
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002741 /* reserved for journal area support */
2742 SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) = (old_format ?
2743 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2744 / p_s_sb->s_blocksize +
Jeff Mahoneycb680c12007-10-18 23:39:27 -07002745 reiserfs_bmap_count(p_s_sb) +
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002746 1 :
2747 REISERFS_DISK_OFFSET_IN_BYTES /
2748 p_s_sb->s_blocksize + 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002749
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002750 /* Sanity check to see is the standard journal fitting withing first bitmap
2751 (actual for small blocksizes) */
2752 if (!SB_ONDISK_JOURNAL_DEVICE(p_s_sb) &&
2753 (SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) +
2754 SB_ONDISK_JOURNAL_SIZE(p_s_sb) > p_s_sb->s_blocksize * 8)) {
2755 reiserfs_warning(p_s_sb,
2756 "journal-1393: journal does not fit for area "
2757 "addressed by first of bitmap blocks. It starts at "
2758 "%u and its size is %u. Block size %ld",
2759 SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb),
2760 SB_ONDISK_JOURNAL_SIZE(p_s_sb),
2761 p_s_sb->s_blocksize);
2762 goto free_and_return;
2763 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002764
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002765 if (journal_init_dev(p_s_sb, journal, j_dev_name) != 0) {
2766 reiserfs_warning(p_s_sb,
2767 "sh-462: unable to initialize jornal device");
2768 goto free_and_return;
2769 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002770
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002771 rs = SB_DISK_SUPER_BLOCK(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002772
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002773 /* read journal header */
2774 bhjh = journal_bread(p_s_sb,
2775 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2776 SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2777 if (!bhjh) {
2778 reiserfs_warning(p_s_sb,
2779 "sh-459: unable to read journal header");
2780 goto free_and_return;
2781 }
2782 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002783
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002784 /* make sure that journal matches to the super block */
2785 if (is_reiserfs_jr(rs)
2786 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2787 sb_jp_journal_magic(rs))) {
2788 reiserfs_warning(p_s_sb,
2789 "sh-460: journal header magic %x "
2790 "(device %s) does not match to magic found in super "
2791 "block %x", jh->jh_journal.jp_journal_magic,
2792 bdevname(journal->j_dev_bd, b),
2793 sb_jp_journal_magic(rs));
2794 brelse(bhjh);
2795 goto free_and_return;
2796 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002797
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002798 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2799 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2800 journal->j_max_commit_age =
2801 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2802 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002803
Edward Shishkincf3d0b82007-10-16 23:30:30 -07002804 if (check_advise_trans_params(p_s_sb, journal) != 0)
2805 goto free_and_return;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002806 journal->j_default_max_commit_age = journal->j_max_commit_age;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002807
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002808 if (commit_max_age != 0) {
2809 journal->j_max_commit_age = commit_max_age;
2810 journal->j_max_trans_age = commit_max_age;
2811 }
2812
2813 reiserfs_info(p_s_sb, "journal params: device %s, size %u, "
2814 "journal first block %u, max trans len %u, max batch %u, "
2815 "max commit age %u, max trans age %u\n",
2816 bdevname(journal->j_dev_bd, b),
2817 SB_ONDISK_JOURNAL_SIZE(p_s_sb),
2818 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2819 journal->j_trans_max,
2820 journal->j_max_batch,
2821 journal->j_max_commit_age, journal->j_max_trans_age);
2822
2823 brelse(bhjh);
2824
2825 journal->j_list_bitmap_index = 0;
2826 journal_list_init(p_s_sb);
2827
2828 memset(journal->j_list_hash_table, 0,
2829 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2830
2831 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2832 spin_lock_init(&journal->j_dirty_buffers_lock);
2833
2834 journal->j_start = 0;
2835 journal->j_len = 0;
2836 journal->j_len_alloc = 0;
2837 atomic_set(&(journal->j_wcount), 0);
2838 atomic_set(&(journal->j_async_throttle), 0);
2839 journal->j_bcount = 0;
2840 journal->j_trans_start_time = 0;
2841 journal->j_last = NULL;
2842 journal->j_first = NULL;
2843 init_waitqueue_head(&(journal->j_join_wait));
2844 sema_init(&journal->j_lock, 1);
2845 sema_init(&journal->j_flush_sem, 1);
2846
2847 journal->j_trans_id = 10;
2848 journal->j_mount_id = 10;
2849 journal->j_state = 0;
2850 atomic_set(&(journal->j_jlock), 0);
2851 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2852 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2853 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2854 journal->j_cnode_used = 0;
2855 journal->j_must_wait = 0;
2856
Jeff Mahoney576f6d72005-11-29 19:34:39 -08002857 if (journal->j_cnode_free == 0) {
2858 reiserfs_warning(p_s_sb, "journal-2004: Journal cnode memory "
2859 "allocation failed (%ld bytes). Journal is "
2860 "too large for available memory. Usually "
2861 "this is due to a journal that is too large.",
2862 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2863 goto free_and_return;
2864 }
2865
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002866 init_journal_hash(p_s_sb);
2867 jl = journal->j_current_jl;
2868 jl->j_list_bitmap = get_list_bitmap(p_s_sb, jl);
2869 if (!jl->j_list_bitmap) {
2870 reiserfs_warning(p_s_sb,
2871 "journal-2005, get_list_bitmap failed for journal list 0");
2872 goto free_and_return;
2873 }
2874 if (journal_read(p_s_sb) < 0) {
2875 reiserfs_warning(p_s_sb, "Replay Failure, unable to mount");
2876 goto free_and_return;
2877 }
2878
2879 reiserfs_mounted_fs_count++;
2880 if (reiserfs_mounted_fs_count <= 1)
2881 commit_wq = create_workqueue("reiserfs");
2882
David Howellsc4028952006-11-22 14:57:56 +00002883 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2884 journal->j_work_sb = p_s_sb;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002885 return 0;
2886 free_and_return:
2887 free_journal_ram(p_s_sb);
2888 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002889}
2890
2891/*
2892** test for a polite end of the current transaction. Used by file_write, and should
2893** be used by delete to make sure they don't write more than can fit inside a single
2894** transaction
2895*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002896int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2897 int new_alloc)
2898{
2899 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2900 time_t now = get_seconds();
2901 /* cannot restart while nested */
2902 BUG_ON(!th->t_trans_id);
2903 if (th->t_refcount > 1)
2904 return 0;
2905 if (journal->j_must_wait > 0 ||
2906 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2907 atomic_read(&(journal->j_jlock)) ||
2908 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2909 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2910 return 1;
2911 }
Chris Mason6ae1ea42006-02-01 03:06:50 -08002912 /* protected by the BKL here */
2913 journal->j_len_alloc += new_alloc;
2914 th->t_blocks_allocated += new_alloc ;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002915 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002916}
2917
2918/* this must be called inside a transaction, and requires the
2919** kernel_lock to be held
2920*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002921void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002922{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002923 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2924 BUG_ON(!th->t_trans_id);
2925 journal->j_must_wait = 1;
2926 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2927 return;
2928}
2929
2930/* this must be called without a transaction started, and does not
2931** require BKL
2932*/
2933void reiserfs_allow_writes(struct super_block *s)
2934{
2935 struct reiserfs_journal *journal = SB_JOURNAL(s);
2936 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2937 wake_up(&journal->j_join_wait);
2938}
2939
2940/* this must be called without a transaction started, and does not
2941** require BKL
2942*/
2943void reiserfs_wait_on_write_block(struct super_block *s)
2944{
2945 struct reiserfs_journal *journal = SB_JOURNAL(s);
2946 wait_event(journal->j_join_wait,
2947 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2948}
2949
2950static void queue_log_writer(struct super_block *s)
2951{
2952 wait_queue_t wait;
2953 struct reiserfs_journal *journal = SB_JOURNAL(s);
2954 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2955
2956 /*
2957 * we don't want to use wait_event here because
2958 * we only want to wait once.
2959 */
2960 init_waitqueue_entry(&wait, current);
2961 add_wait_queue(&journal->j_join_wait, &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002962 set_current_state(TASK_UNINTERRUPTIBLE);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002963 if (test_bit(J_WRITERS_QUEUED, &journal->j_state))
2964 schedule();
Milind Arun Choudhary5ab2f7e2007-05-08 00:30:51 -07002965 __set_current_state(TASK_RUNNING);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002966 remove_wait_queue(&journal->j_join_wait, &wait);
2967}
2968
2969static void wake_queued_writers(struct super_block *s)
2970{
2971 struct reiserfs_journal *journal = SB_JOURNAL(s);
2972 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2973 wake_up(&journal->j_join_wait);
2974}
2975
2976static void let_transaction_grow(struct super_block *sb, unsigned long trans_id)
2977{
2978 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2979 unsigned long bcount = journal->j_bcount;
2980 while (1) {
Nishanth Aravamudan041e0e32005-09-10 00:27:23 -07002981 schedule_timeout_uninterruptible(1);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002982 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2983 while ((atomic_read(&journal->j_wcount) > 0 ||
2984 atomic_read(&journal->j_jlock)) &&
2985 journal->j_trans_id == trans_id) {
2986 queue_log_writer(sb);
2987 }
2988 if (journal->j_trans_id != trans_id)
2989 break;
2990 if (bcount == journal->j_bcount)
2991 break;
2992 bcount = journal->j_bcount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002993 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002994}
2995
2996/* join == true if you must join an existing transaction.
2997** join == false if you can deal with waiting for others to finish
2998**
2999** this will block until the transaction is joinable. send the number of blocks you
3000** expect to use in nblocks.
3001*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003002static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3003 struct super_block *p_s_sb, unsigned long nblocks,
3004 int join)
3005{
3006 time_t now = get_seconds();
3007 int old_trans_id;
3008 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3009 struct reiserfs_transaction_handle myth;
3010 int sched_count = 0;
3011 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003012
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003013 reiserfs_check_lock_depth(p_s_sb, "journal_begin");
Eric Sesterhenn14a61442006-10-03 23:36:38 +02003014 BUG_ON(nblocks > journal->j_trans_max);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003015
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003016 PROC_INFO_INC(p_s_sb, journal.journal_being);
3017 /* set here for journal_join */
3018 th->t_refcount = 1;
3019 th->t_super = p_s_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003020
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003021 relock:
3022 lock_journal(p_s_sb);
3023 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3024 unlock_journal(p_s_sb);
3025 retval = journal->j_errno;
3026 goto out_fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003027 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003028 journal->j_bcount++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003029
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003030 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3031 unlock_journal(p_s_sb);
3032 reiserfs_wait_on_write_block(p_s_sb);
3033 PROC_INFO_INC(p_s_sb, journal.journal_relock_writers);
3034 goto relock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003035 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003036 now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003037
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003038 /* if there is no room in the journal OR
3039 ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning
3040 ** we don't sleep if there aren't other writers
3041 */
3042
3043 if ((!join && journal->j_must_wait > 0) ||
3044 (!join
3045 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3046 || (!join && atomic_read(&journal->j_wcount) > 0
3047 && journal->j_trans_start_time > 0
3048 && (now - journal->j_trans_start_time) >
3049 journal->j_max_trans_age) || (!join
3050 && atomic_read(&journal->j_jlock))
3051 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3052
3053 old_trans_id = journal->j_trans_id;
3054 unlock_journal(p_s_sb); /* allow others to finish this transaction */
3055
3056 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3057 journal->j_max_batch &&
3058 ((journal->j_len + nblocks + 2) * 100) <
3059 (journal->j_len_alloc * 75)) {
3060 if (atomic_read(&journal->j_wcount) > 10) {
3061 sched_count++;
3062 queue_log_writer(p_s_sb);
3063 goto relock;
3064 }
3065 }
3066 /* don't mess with joining the transaction if all we have to do is
3067 * wait for someone else to do a commit
3068 */
3069 if (atomic_read(&journal->j_jlock)) {
3070 while (journal->j_trans_id == old_trans_id &&
3071 atomic_read(&journal->j_jlock)) {
3072 queue_log_writer(p_s_sb);
3073 }
3074 goto relock;
3075 }
3076 retval = journal_join(&myth, p_s_sb, 1);
3077 if (retval)
3078 goto out_fail;
3079
3080 /* someone might have ended the transaction while we joined */
3081 if (old_trans_id != journal->j_trans_id) {
3082 retval = do_journal_end(&myth, p_s_sb, 1, 0);
3083 } else {
3084 retval = do_journal_end(&myth, p_s_sb, 1, COMMIT_NOW);
3085 }
3086
3087 if (retval)
3088 goto out_fail;
3089
3090 PROC_INFO_INC(p_s_sb, journal.journal_relock_wcount);
3091 goto relock;
3092 }
3093 /* we are the first writer, set trans_id */
3094 if (journal->j_trans_start_time == 0) {
3095 journal->j_trans_start_time = get_seconds();
3096 }
3097 atomic_inc(&(journal->j_wcount));
3098 journal->j_len_alloc += nblocks;
3099 th->t_blocks_logged = 0;
3100 th->t_blocks_allocated = nblocks;
3101 th->t_trans_id = journal->j_trans_id;
3102 unlock_journal(p_s_sb);
3103 INIT_LIST_HEAD(&th->t_list);
3104 get_fs_excl();
3105 return 0;
3106
3107 out_fail:
3108 memset(th, 0, sizeof(*th));
3109 /* Re-set th->t_super, so we can properly keep track of how many
3110 * persistent transactions there are. We need to do this so if this
3111 * call is part of a failed restart_transaction, we can free it later */
3112 th->t_super = p_s_sb;
3113 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003114}
3115
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003116struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3117 super_block
3118 *s,
3119 int nblocks)
3120{
3121 int ret;
3122 struct reiserfs_transaction_handle *th;
3123
3124 /* if we're nesting into an existing transaction. It will be
3125 ** persistent on its own
3126 */
3127 if (reiserfs_transaction_running(s)) {
3128 th = current->journal_info;
3129 th->t_refcount++;
Eric Sesterhenn14a61442006-10-03 23:36:38 +02003130 BUG_ON(th->t_refcount < 2);
3131
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003132 return th;
3133 }
Pekka Enbergd739b422006-02-01 03:06:43 -08003134 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003135 if (!th)
3136 return NULL;
3137 ret = journal_begin(th, s, nblocks);
3138 if (ret) {
Pekka Enbergd739b422006-02-01 03:06:43 -08003139 kfree(th);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003140 return NULL;
3141 }
3142
3143 SB_JOURNAL(s)->j_persistent_trans++;
3144 return th;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003145}
3146
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003147int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3148{
3149 struct super_block *s = th->t_super;
3150 int ret = 0;
3151 if (th->t_trans_id)
3152 ret = journal_end(th, th->t_super, th->t_blocks_allocated);
3153 else
3154 ret = -EIO;
3155 if (th->t_refcount == 0) {
3156 SB_JOURNAL(s)->j_persistent_trans--;
Pekka Enbergd739b422006-02-01 03:06:43 -08003157 kfree(th);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003158 }
3159 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003160}
3161
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003162static int journal_join(struct reiserfs_transaction_handle *th,
3163 struct super_block *p_s_sb, unsigned long nblocks)
3164{
3165 struct reiserfs_transaction_handle *cur_th = current->journal_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003166
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003167 /* this keeps do_journal_end from NULLing out the current->journal_info
3168 ** pointer
3169 */
3170 th->t_handle_save = cur_th;
Eric Sesterhenn14a61442006-10-03 23:36:38 +02003171 BUG_ON(cur_th && cur_th->t_refcount > 1);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003172 return do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_JOIN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003173}
3174
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003175int journal_join_abort(struct reiserfs_transaction_handle *th,
3176 struct super_block *p_s_sb, unsigned long nblocks)
3177{
3178 struct reiserfs_transaction_handle *cur_th = current->journal_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003179
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003180 /* this keeps do_journal_end from NULLing out the current->journal_info
3181 ** pointer
3182 */
3183 th->t_handle_save = cur_th;
Eric Sesterhenn14a61442006-10-03 23:36:38 +02003184 BUG_ON(cur_th && cur_th->t_refcount > 1);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003185 return do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_ABORT);
3186}
3187
3188int journal_begin(struct reiserfs_transaction_handle *th,
3189 struct super_block *p_s_sb, unsigned long nblocks)
3190{
3191 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3192 int ret;
3193
3194 th->t_handle_save = NULL;
3195 if (cur_th) {
3196 /* we are nesting into the current transaction */
3197 if (cur_th->t_super == p_s_sb) {
3198 BUG_ON(!cur_th->t_refcount);
3199 cur_th->t_refcount++;
3200 memcpy(th, cur_th, sizeof(*th));
3201 if (th->t_refcount <= 1)
3202 reiserfs_warning(p_s_sb,
3203 "BAD: refcount <= 1, but journal_info != 0");
3204 return 0;
3205 } else {
3206 /* we've ended up with a handle from a different filesystem.
3207 ** save it and restore on journal_end. This should never
3208 ** really happen...
3209 */
3210 reiserfs_warning(p_s_sb,
3211 "clm-2100: nesting info a different FS");
3212 th->t_handle_save = current->journal_info;
3213 current->journal_info = th;
3214 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003215 } else {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003216 current->journal_info = th;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003217 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003218 ret = do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_REG);
Eric Sesterhenn14a61442006-10-03 23:36:38 +02003219 BUG_ON(current->journal_info != th);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003220
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003221 /* I guess this boils down to being the reciprocal of clm-2100 above.
3222 * If do_journal_begin_r fails, we need to put it back, since journal_end
3223 * won't be called to do it. */
3224 if (ret)
3225 current->journal_info = th->t_handle_save;
3226 else
3227 BUG_ON(!th->t_refcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003228
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003229 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003230}
3231
3232/*
3233** puts bh into the current transaction. If it was already there, reorders removes the
3234** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order).
3235**
3236** if it was dirty, cleans and files onto the clean list. I can't let it be dirty again until the
3237** transaction is committed.
3238**
3239** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3240*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003241int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3242 struct super_block *p_s_sb, struct buffer_head *bh)
3243{
3244 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3245 struct reiserfs_journal_cnode *cn = NULL;
3246 int count_already_incd = 0;
3247 int prepared = 0;
3248 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003249
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003250 PROC_INFO_INC(p_s_sb, journal.mark_dirty);
3251 if (th->t_trans_id != journal->j_trans_id) {
3252 reiserfs_panic(th->t_super,
3253 "journal-1577: handle trans id %ld != current trans id %ld\n",
3254 th->t_trans_id, journal->j_trans_id);
3255 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003256
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003257 p_s_sb->s_dirt = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003258
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003259 prepared = test_clear_buffer_journal_prepared(bh);
3260 clear_buffer_journal_restore_dirty(bh);
3261 /* already in this transaction, we are done */
3262 if (buffer_journaled(bh)) {
3263 PROC_INFO_INC(p_s_sb, journal.mark_dirty_already);
3264 return 0;
3265 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003266
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003267 /* this must be turned into a panic instead of a warning. We can't allow
3268 ** a dirty or journal_dirty or locked buffer to be logged, as some changes
3269 ** could get to disk too early. NOT GOOD.
3270 */
3271 if (!prepared || buffer_dirty(bh)) {
3272 reiserfs_warning(p_s_sb, "journal-1777: buffer %llu bad state "
3273 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3274 (unsigned long long)bh->b_blocknr,
3275 prepared ? ' ' : '!',
3276 buffer_locked(bh) ? ' ' : '!',
3277 buffer_dirty(bh) ? ' ' : '!',
3278 buffer_journal_dirty(bh) ? ' ' : '!');
3279 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003280
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003281 if (atomic_read(&(journal->j_wcount)) <= 0) {
3282 reiserfs_warning(p_s_sb,
3283 "journal-1409: journal_mark_dirty returning because j_wcount was %d",
3284 atomic_read(&(journal->j_wcount)));
3285 return 1;
3286 }
3287 /* this error means I've screwed up, and we've overflowed the transaction.
3288 ** Nothing can be done here, except make the FS readonly or panic.
3289 */
3290 if (journal->j_len >= journal->j_trans_max) {
3291 reiserfs_panic(th->t_super,
3292 "journal-1413: journal_mark_dirty: j_len (%lu) is too big\n",
3293 journal->j_len);
3294 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003295
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003296 if (buffer_journal_dirty(bh)) {
3297 count_already_incd = 1;
3298 PROC_INFO_INC(p_s_sb, journal.mark_dirty_notjournal);
3299 clear_buffer_journal_dirty(bh);
3300 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003301
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003302 if (journal->j_len > journal->j_len_alloc) {
3303 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3304 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003305
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003306 set_buffer_journaled(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003307
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003308 /* now put this guy on the end */
3309 if (!cn) {
3310 cn = get_cnode(p_s_sb);
3311 if (!cn) {
3312 reiserfs_panic(p_s_sb, "get_cnode failed!\n");
3313 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003314
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003315 if (th->t_blocks_logged == th->t_blocks_allocated) {
3316 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3317 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3318 }
3319 th->t_blocks_logged++;
3320 journal->j_len++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003321
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003322 cn->bh = bh;
3323 cn->blocknr = bh->b_blocknr;
3324 cn->sb = p_s_sb;
3325 cn->jlist = NULL;
3326 insert_journal_hash(journal->j_hash_table, cn);
3327 if (!count_already_incd) {
3328 get_bh(bh);
3329 }
3330 }
3331 cn->next = NULL;
3332 cn->prev = journal->j_last;
3333 cn->bh = bh;
3334 if (journal->j_last) {
3335 journal->j_last->next = cn;
3336 journal->j_last = cn;
3337 } else {
3338 journal->j_first = cn;
3339 journal->j_last = cn;
3340 }
3341 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003342}
3343
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003344int journal_end(struct reiserfs_transaction_handle *th,
3345 struct super_block *p_s_sb, unsigned long nblocks)
3346{
3347 if (!current->journal_info && th->t_refcount > 1)
3348 reiserfs_warning(p_s_sb, "REISER-NESTING: th NULL, refcount %d",
3349 th->t_refcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003350
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003351 if (!th->t_trans_id) {
3352 WARN_ON(1);
3353 return -EIO;
3354 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003355
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003356 th->t_refcount--;
3357 if (th->t_refcount > 0) {
3358 struct reiserfs_transaction_handle *cur_th =
3359 current->journal_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003360
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003361 /* we aren't allowed to close a nested transaction on a different
3362 ** filesystem from the one in the task struct
3363 */
Eric Sesterhenn14a61442006-10-03 23:36:38 +02003364 BUG_ON(cur_th->t_super != th->t_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003365
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003366 if (th != cur_th) {
3367 memcpy(current->journal_info, th, sizeof(*th));
3368 th->t_trans_id = 0;
3369 }
3370 return 0;
3371 } else {
3372 return do_journal_end(th, p_s_sb, nblocks, 0);
3373 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003374}
3375
3376/* removes from the current transaction, relsing and descrementing any counters.
3377** also files the removed buffer directly onto the clean list
3378**
3379** called by journal_mark_freed when a block has been deleted
3380**
3381** returns 1 if it cleaned and relsed the buffer. 0 otherwise
3382*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003383static int remove_from_transaction(struct super_block *p_s_sb,
3384 b_blocknr_t blocknr, int already_cleaned)
3385{
3386 struct buffer_head *bh;
3387 struct reiserfs_journal_cnode *cn;
3388 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3389 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003390
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003391 cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, blocknr);
3392 if (!cn || !cn->bh) {
3393 return ret;
3394 }
3395 bh = cn->bh;
3396 if (cn->prev) {
3397 cn->prev->next = cn->next;
3398 }
3399 if (cn->next) {
3400 cn->next->prev = cn->prev;
3401 }
3402 if (cn == journal->j_first) {
3403 journal->j_first = cn->next;
3404 }
3405 if (cn == journal->j_last) {
3406 journal->j_last = cn->prev;
3407 }
3408 if (bh)
3409 remove_journal_hash(p_s_sb, journal->j_hash_table, NULL,
3410 bh->b_blocknr, 0);
3411 clear_buffer_journaled(bh); /* don't log this one */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003412
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003413 if (!already_cleaned) {
3414 clear_buffer_journal_dirty(bh);
3415 clear_buffer_dirty(bh);
3416 clear_buffer_journal_test(bh);
3417 put_bh(bh);
3418 if (atomic_read(&(bh->b_count)) < 0) {
3419 reiserfs_warning(p_s_sb,
3420 "journal-1752: remove from trans, b_count < 0");
3421 }
3422 ret = 1;
3423 }
3424 journal->j_len--;
3425 journal->j_len_alloc--;
3426 free_cnode(p_s_sb, cn);
3427 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003428}
3429
3430/*
3431** for any cnode in a journal list, it can only be dirtied of all the
Matt LaPlante0779bf22006-11-30 05:24:39 +01003432** transactions that include it are committed to disk.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003433** this checks through each transaction, and returns 1 if you are allowed to dirty,
3434** and 0 if you aren't
3435**
3436** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log
3437** blocks for a given transaction on disk
3438**
3439*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003440static int can_dirty(struct reiserfs_journal_cnode *cn)
3441{
3442 struct super_block *sb = cn->sb;
3443 b_blocknr_t blocknr = cn->blocknr;
3444 struct reiserfs_journal_cnode *cur = cn->hprev;
3445 int can_dirty = 1;
3446
3447 /* first test hprev. These are all newer than cn, so any node here
3448 ** with the same block number and dev means this node can't be sent
3449 ** to disk right now.
3450 */
3451 while (cur && can_dirty) {
3452 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3453 cur->blocknr == blocknr) {
3454 can_dirty = 0;
3455 }
3456 cur = cur->hprev;
3457 }
3458 /* then test hnext. These are all older than cn. As long as they
3459 ** are committed to the log, it is safe to write cn to disk
3460 */
3461 cur = cn->hnext;
3462 while (cur && can_dirty) {
3463 if (cur->jlist && cur->jlist->j_len > 0 &&
3464 atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh &&
3465 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3466 can_dirty = 0;
3467 }
3468 cur = cur->hnext;
3469 }
3470 return can_dirty;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003471}
3472
3473/* syncs the commit blocks, but does not force the real buffers to disk
Matt LaPlante0779bf22006-11-30 05:24:39 +01003474** will wait until the current transaction is done/committed before returning
Linus Torvalds1da177e2005-04-16 15:20:36 -07003475*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003476int journal_end_sync(struct reiserfs_transaction_handle *th,
3477 struct super_block *p_s_sb, unsigned long nblocks)
3478{
3479 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003480
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003481 BUG_ON(!th->t_trans_id);
3482 /* you can sync while nested, very, very bad */
Eric Sesterhenn14a61442006-10-03 23:36:38 +02003483 BUG_ON(th->t_refcount > 1);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003484 if (journal->j_len == 0) {
3485 reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb),
3486 1);
3487 journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb));
3488 }
3489 return do_journal_end(th, p_s_sb, nblocks, COMMIT_NOW | WAIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003490}
3491
3492/*
3493** writeback the pending async commits to disk
3494*/
David Howellsc4028952006-11-22 14:57:56 +00003495static void flush_async_commits(struct work_struct *work)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003496{
David Howellsc4028952006-11-22 14:57:56 +00003497 struct reiserfs_journal *journal =
3498 container_of(work, struct reiserfs_journal, j_work.work);
3499 struct super_block *p_s_sb = journal->j_work_sb;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003500 struct reiserfs_journal_list *jl;
3501 struct list_head *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003502
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003503 lock_kernel();
3504 if (!list_empty(&journal->j_journal_list)) {
3505 /* last entry is the youngest, commit it and you get everything */
3506 entry = journal->j_journal_list.prev;
3507 jl = JOURNAL_LIST_ENTRY(entry);
3508 flush_commit_list(p_s_sb, jl, 1);
3509 }
3510 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003511}
3512
3513/*
3514** flushes any old transactions to disk
3515** ends the current transaction if it is too old
3516*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003517int reiserfs_flush_old_commits(struct super_block *p_s_sb)
3518{
3519 time_t now;
3520 struct reiserfs_transaction_handle th;
3521 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003522
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003523 now = get_seconds();
3524 /* safety check so we don't flush while we are replaying the log during
3525 * mount
3526 */
3527 if (list_empty(&journal->j_journal_list)) {
3528 return 0;
3529 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003530
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003531 /* check the current transaction. If there are no writers, and it is
3532 * too old, finish it, and force the commit blocks to disk
3533 */
3534 if (atomic_read(&journal->j_wcount) <= 0 &&
3535 journal->j_trans_start_time > 0 &&
3536 journal->j_len > 0 &&
3537 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3538 if (!journal_join(&th, p_s_sb, 1)) {
3539 reiserfs_prepare_for_journal(p_s_sb,
3540 SB_BUFFER_WITH_SB(p_s_sb),
3541 1);
3542 journal_mark_dirty(&th, p_s_sb,
3543 SB_BUFFER_WITH_SB(p_s_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003544
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003545 /* we're only being called from kreiserfsd, it makes no sense to do
3546 ** an async commit so that kreiserfsd can do it later
3547 */
3548 do_journal_end(&th, p_s_sb, 1, COMMIT_NOW | WAIT);
3549 }
3550 }
3551 return p_s_sb->s_dirt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003552}
3553
3554/*
3555** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit
3556**
3557** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all
3558** the writers are done. By the time it wakes up, the transaction it was called has already ended, so it just
3559** flushes the commit list and returns 0.
3560**
3561** Won't batch when flush or commit_now is set. Also won't batch when others are waiting on j_join_wait.
3562**
3563** Note, we can't allow the journal_end to proceed while there are still writers in the log.
3564*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003565static int check_journal_end(struct reiserfs_transaction_handle *th,
3566 struct super_block *p_s_sb, unsigned long nblocks,
3567 int flags)
3568{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003569
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003570 time_t now;
3571 int flush = flags & FLUSH_ALL;
3572 int commit_now = flags & COMMIT_NOW;
3573 int wait_on_commit = flags & WAIT;
3574 struct reiserfs_journal_list *jl;
3575 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003576
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003577 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003578
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003579 if (th->t_trans_id != journal->j_trans_id) {
3580 reiserfs_panic(th->t_super,
3581 "journal-1577: handle trans id %ld != current trans id %ld\n",
3582 th->t_trans_id, journal->j_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003583 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003584
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003585 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3586 if (atomic_read(&(journal->j_wcount)) > 0) { /* <= 0 is allowed. unmounting might not call begin */
3587 atomic_dec(&(journal->j_wcount));
3588 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003589
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003590 /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released
3591 ** will be dealt with by next transaction that actually writes something, but should be taken
3592 ** care of in this trans
3593 */
Eric Sesterhenn14a61442006-10-03 23:36:38 +02003594 BUG_ON(journal->j_len == 0);
3595
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003596 /* if wcount > 0, and we are called to with flush or commit_now,
3597 ** we wait on j_join_wait. We will wake up when the last writer has
3598 ** finished the transaction, and started it on its way to the disk.
3599 ** Then, we flush the commit or journal list, and just return 0
3600 ** because the rest of journal end was already done for this transaction.
3601 */
3602 if (atomic_read(&(journal->j_wcount)) > 0) {
3603 if (flush || commit_now) {
3604 unsigned trans_id;
3605
3606 jl = journal->j_current_jl;
3607 trans_id = jl->j_trans_id;
3608 if (wait_on_commit)
3609 jl->j_state |= LIST_COMMIT_PENDING;
3610 atomic_set(&(journal->j_jlock), 1);
3611 if (flush) {
3612 journal->j_next_full_flush = 1;
3613 }
3614 unlock_journal(p_s_sb);
3615
3616 /* sleep while the current transaction is still j_jlocked */
3617 while (journal->j_trans_id == trans_id) {
3618 if (atomic_read(&journal->j_jlock)) {
3619 queue_log_writer(p_s_sb);
3620 } else {
3621 lock_journal(p_s_sb);
3622 if (journal->j_trans_id == trans_id) {
3623 atomic_set(&(journal->j_jlock),
3624 1);
3625 }
3626 unlock_journal(p_s_sb);
3627 }
3628 }
Eric Sesterhenn14a61442006-10-03 23:36:38 +02003629 BUG_ON(journal->j_trans_id == trans_id);
3630
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003631 if (commit_now
3632 && journal_list_still_alive(p_s_sb, trans_id)
3633 && wait_on_commit) {
3634 flush_commit_list(p_s_sb, jl, 1);
3635 }
3636 return 0;
3637 }
3638 unlock_journal(p_s_sb);
3639 return 0;
3640 }
3641
3642 /* deal with old transactions where we are the last writers */
3643 now = get_seconds();
3644 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3645 commit_now = 1;
3646 journal->j_next_async_flush = 1;
3647 }
3648 /* don't batch when someone is waiting on j_join_wait */
3649 /* don't batch when syncing the commit or flushing the whole trans */
3650 if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock)))
3651 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3652 && journal->j_len_alloc < journal->j_max_batch
3653 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3654 journal->j_bcount++;
3655 unlock_journal(p_s_sb);
3656 return 0;
3657 }
3658
3659 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(p_s_sb)) {
3660 reiserfs_panic(p_s_sb,
3661 "journal-003: journal_end: j_start (%ld) is too high\n",
3662 journal->j_start);
3663 }
3664 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003665}
3666
3667/*
3668** Does all the work that makes deleting blocks safe.
3669** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on.
3670**
3671** otherwise:
3672** set a bit for the block in the journal bitmap. That will prevent it from being allocated for unformatted nodes
3673** before this transaction has finished.
3674**
3675** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. That will prevent any old transactions with
3676** this block from trying to flush to the real location. Since we aren't removing the cnode from the journal_list_hash,
3677** the block can't be reallocated yet.
3678**
3679** Then remove it from the current transaction, decrementing any counters and filing it on the clean list.
3680*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003681int journal_mark_freed(struct reiserfs_transaction_handle *th,
3682 struct super_block *p_s_sb, b_blocknr_t blocknr)
3683{
3684 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3685 struct reiserfs_journal_cnode *cn = NULL;
3686 struct buffer_head *bh = NULL;
3687 struct reiserfs_list_bitmap *jb = NULL;
3688 int cleaned = 0;
3689 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003690
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003691 cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, blocknr);
3692 if (cn && cn->bh) {
3693 bh = cn->bh;
3694 get_bh(bh);
3695 }
3696 /* if it is journal new, we just remove it from this transaction */
3697 if (bh && buffer_journal_new(bh)) {
3698 clear_buffer_journal_new(bh);
3699 clear_prepared_bits(bh);
3700 reiserfs_clean_and_file_buffer(bh);
3701 cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned);
3702 } else {
3703 /* set the bit for this block in the journal bitmap for this transaction */
3704 jb = journal->j_current_jl->j_list_bitmap;
3705 if (!jb) {
3706 reiserfs_panic(p_s_sb,
3707 "journal-1702: journal_mark_freed, journal_list_bitmap is NULL\n");
3708 }
3709 set_bit_in_list_bitmap(p_s_sb, blocknr, jb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003710
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003711 /* Note, the entire while loop is not allowed to schedule. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003712
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003713 if (bh) {
3714 clear_prepared_bits(bh);
3715 reiserfs_clean_and_file_buffer(bh);
3716 }
3717 cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003718
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003719 /* find all older transactions with this block, make sure they don't try to write it out */
3720 cn = get_journal_hash_dev(p_s_sb, journal->j_list_hash_table,
3721 blocknr);
3722 while (cn) {
3723 if (p_s_sb == cn->sb && blocknr == cn->blocknr) {
3724 set_bit(BLOCK_FREED, &cn->state);
3725 if (cn->bh) {
3726 if (!cleaned) {
3727 /* remove_from_transaction will brelse the buffer if it was
3728 ** in the current trans
3729 */
3730 clear_buffer_journal_dirty(cn->
3731 bh);
3732 clear_buffer_dirty(cn->bh);
3733 clear_buffer_journal_test(cn->
3734 bh);
3735 cleaned = 1;
3736 put_bh(cn->bh);
3737 if (atomic_read
3738 (&(cn->bh->b_count)) < 0) {
3739 reiserfs_warning(p_s_sb,
3740 "journal-2138: cn->bh->b_count < 0");
3741 }
3742 }
3743 if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */
3744 atomic_dec(&
3745 (cn->jlist->
3746 j_nonzerolen));
3747 }
3748 cn->bh = NULL;
3749 }
3750 }
3751 cn = cn->hnext;
3752 }
3753 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003754
Chris Mason398c95b2007-10-16 23:29:44 -07003755 if (bh)
3756 release_buffer_page(bh); /* get_hash grabs the buffer */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003757 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003758}
3759
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003760void reiserfs_update_inode_transaction(struct inode *inode)
3761{
3762 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3763 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3764 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003765}
3766
3767/*
3768 * returns -1 on error, 0 if no commits/barriers were done and 1
3769 * if a transaction was actually committed and the barrier was done
3770 */
3771static int __commit_trans_jl(struct inode *inode, unsigned long id,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003772 struct reiserfs_journal_list *jl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003773{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003774 struct reiserfs_transaction_handle th;
3775 struct super_block *sb = inode->i_sb;
3776 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3777 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003778
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003779 /* is it from the current transaction, or from an unknown transaction? */
3780 if (id == journal->j_trans_id) {
3781 jl = journal->j_current_jl;
3782 /* try to let other writers come in and grow this transaction */
3783 let_transaction_grow(sb, id);
3784 if (journal->j_trans_id != id) {
3785 goto flush_commit_only;
3786 }
3787
3788 ret = journal_begin(&th, sb, 1);
3789 if (ret)
3790 return ret;
3791
3792 /* someone might have ended this transaction while we joined */
3793 if (journal->j_trans_id != id) {
3794 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3795 1);
3796 journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb));
3797 ret = journal_end(&th, sb, 1);
3798 goto flush_commit_only;
3799 }
3800
3801 ret = journal_end_sync(&th, sb, 1);
3802 if (!ret)
3803 ret = 1;
3804
3805 } else {
3806 /* this gets tricky, we have to make sure the journal list in
3807 * the inode still exists. We know the list is still around
3808 * if we've got a larger transaction id than the oldest list
3809 */
3810 flush_commit_only:
3811 if (journal_list_still_alive(inode->i_sb, id)) {
3812 /*
3813 * we only set ret to 1 when we know for sure
3814 * the barrier hasn't been started yet on the commit
3815 * block.
3816 */
3817 if (atomic_read(&jl->j_commit_left) > 1)
3818 ret = 1;
3819 flush_commit_list(sb, jl, 1);
3820 if (journal->j_errno)
3821 ret = journal->j_errno;
3822 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003823 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003824 /* otherwise the list is gone, and long since committed */
3825 return ret;
3826}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003827
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003828int reiserfs_commit_for_inode(struct inode *inode)
3829{
3830 unsigned long id = REISERFS_I(inode)->i_trans_id;
3831 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003832
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003833 /* for the whole inode, assume unset id means it was
3834 * changed in the current transaction. More conservative
Linus Torvalds1da177e2005-04-16 15:20:36 -07003835 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003836 if (!id || !jl) {
3837 reiserfs_update_inode_transaction(inode);
3838 id = REISERFS_I(inode)->i_trans_id;
3839 /* jl will be updated in __commit_trans_jl */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003840 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003841
3842 return __commit_trans_jl(inode, id, jl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003843}
3844
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003845void reiserfs_restore_prepared_buffer(struct super_block *p_s_sb,
3846 struct buffer_head *bh)
3847{
3848 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3849 PROC_INFO_INC(p_s_sb, journal.restore_prepared);
3850 if (!bh) {
3851 return;
3852 }
3853 if (test_clear_buffer_journal_restore_dirty(bh) &&
3854 buffer_journal_dirty(bh)) {
3855 struct reiserfs_journal_cnode *cn;
3856 cn = get_journal_hash_dev(p_s_sb,
3857 journal->j_list_hash_table,
3858 bh->b_blocknr);
3859 if (cn && can_dirty(cn)) {
3860 set_buffer_journal_test(bh);
3861 mark_buffer_dirty(bh);
3862 }
3863 }
3864 clear_buffer_journal_prepared(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003865}
3866
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003867extern struct tree_balance *cur_tb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003868/*
3869** before we can change a metadata block, we have to make sure it won't
3870** be written to disk while we are altering it. So, we must:
3871** clean it
3872** wait on it.
3873**
3874*/
3875int reiserfs_prepare_for_journal(struct super_block *p_s_sb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003876 struct buffer_head *bh, int wait)
3877{
3878 PROC_INFO_INC(p_s_sb, journal.prepare);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003879
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003880 if (test_set_buffer_locked(bh)) {
3881 if (!wait)
3882 return 0;
3883 lock_buffer(bh);
3884 }
3885 set_buffer_journal_prepared(bh);
3886 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3887 clear_buffer_journal_test(bh);
3888 set_buffer_journal_restore_dirty(bh);
3889 }
3890 unlock_buffer(bh);
3891 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003892}
3893
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003894static void flush_old_journal_lists(struct super_block *s)
3895{
3896 struct reiserfs_journal *journal = SB_JOURNAL(s);
3897 struct reiserfs_journal_list *jl;
3898 struct list_head *entry;
3899 time_t now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003900
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003901 while (!list_empty(&journal->j_journal_list)) {
3902 entry = journal->j_journal_list.next;
3903 jl = JOURNAL_LIST_ENTRY(entry);
3904 /* this check should always be run, to send old lists to disk */
Chris Masona3172022006-09-29 01:59:56 -07003905 if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4)) &&
3906 atomic_read(&jl->j_commit_left) == 0 &&
3907 test_transaction(s, jl)) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003908 flush_used_journal_lists(s, jl);
3909 } else {
3910 break;
3911 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003912 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003913}
3914
3915/*
3916** long and ugly. If flush, will not return until all commit
3917** blocks and all real buffers in the trans are on disk.
3918** If no_async, won't return until all commit blocks are on disk.
3919**
3920** keep reading, there are comments as you go along
3921**
3922** If the journal is aborted, we just clean up. Things like flushing
3923** journal lists, etc just won't happen.
3924*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003925static int do_journal_end(struct reiserfs_transaction_handle *th,
3926 struct super_block *p_s_sb, unsigned long nblocks,
3927 int flags)
3928{
3929 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3930 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3931 struct reiserfs_journal_cnode *last_cn = NULL;
3932 struct reiserfs_journal_desc *desc;
3933 struct reiserfs_journal_commit *commit;
3934 struct buffer_head *c_bh; /* commit bh */
3935 struct buffer_head *d_bh; /* desc bh */
3936 int cur_write_start = 0; /* start index of current log write */
3937 int old_start;
3938 int i;
Alexander Zarochentseva44c94a2006-03-25 03:06:59 -08003939 int flush;
3940 int wait_on_commit;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003941 struct reiserfs_journal_list *jl, *temp_jl;
3942 struct list_head *entry, *safe;
3943 unsigned long jindex;
3944 unsigned long commit_trans_id;
3945 int trans_half;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003946
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003947 BUG_ON(th->t_refcount > 1);
3948 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003949
Alexander Zarochentseva44c94a2006-03-25 03:06:59 -08003950 /* protect flush_older_commits from doing mistakes if the
3951 transaction ID counter gets overflowed. */
3952 if (th->t_trans_id == ~0UL)
3953 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
3954 flush = flags & FLUSH_ALL;
3955 wait_on_commit = flags & WAIT;
3956
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003957 put_fs_excl();
3958 current->journal_info = th->t_handle_save;
3959 reiserfs_check_lock_depth(p_s_sb, "journal end");
3960 if (journal->j_len == 0) {
3961 reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb),
3962 1);
3963 journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb));
3964 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003965
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003966 lock_journal(p_s_sb);
3967 if (journal->j_next_full_flush) {
3968 flags |= FLUSH_ALL;
3969 flush = 1;
3970 }
3971 if (journal->j_next_async_flush) {
3972 flags |= COMMIT_NOW | WAIT;
3973 wait_on_commit = 1;
3974 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003975
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003976 /* check_journal_end locks the journal, and unlocks if it does not return 1
3977 ** it tells us if we should continue with the journal_end, or just return
3978 */
3979 if (!check_journal_end(th, p_s_sb, nblocks, flags)) {
3980 p_s_sb->s_dirt = 1;
3981 wake_queued_writers(p_s_sb);
3982 reiserfs_async_progress_wait(p_s_sb);
3983 goto out;
3984 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003985
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003986 /* check_journal_end might set these, check again */
3987 if (journal->j_next_full_flush) {
3988 flush = 1;
3989 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003990
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003991 /*
3992 ** j must wait means we have to flush the log blocks, and the real blocks for
3993 ** this transaction
3994 */
3995 if (journal->j_must_wait > 0) {
3996 flush = 1;
3997 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003998#ifdef REISERFS_PREALLOCATE
Jan Karaef43bc42006-01-11 12:17:40 -08003999 /* quota ops might need to nest, setup the journal_info pointer for them
4000 * and raise the refcount so that it is > 0. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004001 current->journal_info = th;
Jan Karaef43bc42006-01-11 12:17:40 -08004002 th->t_refcount++;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004003 reiserfs_discard_all_prealloc(th); /* it should not involve new blocks into
4004 * the transaction */
Jan Karaef43bc42006-01-11 12:17:40 -08004005 th->t_refcount--;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004006 current->journal_info = th->t_handle_save;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004007#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07004008
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004009 /* setup description block */
4010 d_bh =
4011 journal_getblk(p_s_sb,
4012 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
4013 journal->j_start);
4014 set_buffer_uptodate(d_bh);
4015 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4016 memset(d_bh->b_data, 0, d_bh->b_size);
4017 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4018 set_desc_trans_id(desc, journal->j_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004019
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004020 /* setup commit block. Don't write (keep it clean too) this one until after everyone else is written */
4021 c_bh = journal_getblk(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
4022 ((journal->j_start + journal->j_len +
4023 1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
4024 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4025 memset(c_bh->b_data, 0, c_bh->b_size);
4026 set_commit_trans_id(commit, journal->j_trans_id);
4027 set_buffer_uptodate(c_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004028
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004029 /* init this journal list */
4030 jl = journal->j_current_jl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004031
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004032 /* we lock the commit before doing anything because
4033 * we want to make sure nobody tries to run flush_commit_list until
4034 * the new transaction is fully setup, and we've already flushed the
4035 * ordered bh list
4036 */
4037 down(&jl->j_commit_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004038
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004039 /* save the transaction id in case we need to commit it later */
4040 commit_trans_id = jl->j_trans_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004041
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004042 atomic_set(&jl->j_older_commits_done, 0);
4043 jl->j_trans_id = journal->j_trans_id;
4044 jl->j_timestamp = journal->j_trans_start_time;
4045 jl->j_commit_bh = c_bh;
4046 jl->j_start = journal->j_start;
4047 jl->j_len = journal->j_len;
4048 atomic_set(&jl->j_nonzerolen, journal->j_len);
4049 atomic_set(&jl->j_commit_left, journal->j_len + 2);
4050 jl->j_realblock = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004051
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004052 /* The ENTIRE FOR LOOP MUST not cause schedule to occur.
4053 ** for each real block, add it to the journal list hash,
4054 ** copy into real block index array in the commit or desc block
4055 */
4056 trans_half = journal_trans_half(p_s_sb->s_blocksize);
4057 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4058 if (buffer_journaled(cn->bh)) {
4059 jl_cn = get_cnode(p_s_sb);
4060 if (!jl_cn) {
4061 reiserfs_panic(p_s_sb,
4062 "journal-1676, get_cnode returned NULL\n");
4063 }
4064 if (i == 0) {
4065 jl->j_realblock = jl_cn;
4066 }
4067 jl_cn->prev = last_cn;
4068 jl_cn->next = NULL;
4069 if (last_cn) {
4070 last_cn->next = jl_cn;
4071 }
4072 last_cn = jl_cn;
4073 /* make sure the block we are trying to log is not a block
4074 of journal or reserved area */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004075
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004076 if (is_block_in_log_or_reserved_area
4077 (p_s_sb, cn->bh->b_blocknr)) {
4078 reiserfs_panic(p_s_sb,
4079 "journal-2332: Trying to log block %lu, which is a log block\n",
4080 cn->bh->b_blocknr);
4081 }
4082 jl_cn->blocknr = cn->bh->b_blocknr;
4083 jl_cn->state = 0;
4084 jl_cn->sb = p_s_sb;
4085 jl_cn->bh = cn->bh;
4086 jl_cn->jlist = jl;
4087 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4088 if (i < trans_half) {
4089 desc->j_realblock[i] =
4090 cpu_to_le32(cn->bh->b_blocknr);
4091 } else {
4092 commit->j_realblock[i - trans_half] =
4093 cpu_to_le32(cn->bh->b_blocknr);
4094 }
4095 } else {
4096 i--;
4097 }
4098 }
4099 set_desc_trans_len(desc, journal->j_len);
4100 set_desc_mount_id(desc, journal->j_mount_id);
4101 set_desc_trans_id(desc, journal->j_trans_id);
4102 set_commit_trans_len(commit, journal->j_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004103
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004104 /* special check in case all buffers in the journal were marked for not logging */
Eric Sesterhenn14a61442006-10-03 23:36:38 +02004105 BUG_ON(journal->j_len == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004106
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004107 /* we're about to dirty all the log blocks, mark the description block
4108 * dirty now too. Don't mark the commit block dirty until all the
4109 * others are on disk
4110 */
4111 mark_buffer_dirty(d_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004112
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004113 /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */
4114 cur_write_start = journal->j_start;
4115 cn = journal->j_first;
4116 jindex = 1; /* start at one so we don't get the desc again */
4117 while (cn) {
4118 clear_buffer_journal_new(cn->bh);
4119 /* copy all the real blocks into log area. dirty log blocks */
4120 if (buffer_journaled(cn->bh)) {
4121 struct buffer_head *tmp_bh;
4122 char *addr;
4123 struct page *page;
4124 tmp_bh =
4125 journal_getblk(p_s_sb,
4126 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
4127 ((cur_write_start +
4128 jindex) %
4129 SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
4130 set_buffer_uptodate(tmp_bh);
4131 page = cn->bh->b_page;
4132 addr = kmap(page);
4133 memcpy(tmp_bh->b_data,
4134 addr + offset_in_page(cn->bh->b_data),
4135 cn->bh->b_size);
4136 kunmap(page);
4137 mark_buffer_dirty(tmp_bh);
4138 jindex++;
4139 set_buffer_journal_dirty(cn->bh);
4140 clear_buffer_journaled(cn->bh);
4141 } else {
4142 /* JDirty cleared sometime during transaction. don't log this one */
4143 reiserfs_warning(p_s_sb,
4144 "journal-2048: do_journal_end: BAD, buffer in journal hash, but not JDirty!");
4145 brelse(cn->bh);
4146 }
4147 next = cn->next;
4148 free_cnode(p_s_sb, cn);
4149 cn = next;
4150 cond_resched();
4151 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004152
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004153 /* we are done with both the c_bh and d_bh, but
4154 ** c_bh must be written after all other commit blocks,
4155 ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4156 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004157
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004158 journal->j_current_jl = alloc_journal_list(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004159
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004160 /* now it is safe to insert this transaction on the main list */
4161 list_add_tail(&jl->j_list, &journal->j_journal_list);
4162 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4163 journal->j_num_work_lists++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004164
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004165 /* reset journal values for the next transaction */
4166 old_start = journal->j_start;
4167 journal->j_start =
4168 (journal->j_start + journal->j_len +
4169 2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb);
4170 atomic_set(&(journal->j_wcount), 0);
4171 journal->j_bcount = 0;
4172 journal->j_last = NULL;
4173 journal->j_first = NULL;
4174 journal->j_len = 0;
4175 journal->j_trans_start_time = 0;
Alexander Zarochentseva44c94a2006-03-25 03:06:59 -08004176 /* check for trans_id overflow */
4177 if (++journal->j_trans_id == 0)
4178 journal->j_trans_id = 10;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004179 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4180 journal->j_must_wait = 0;
4181 journal->j_len_alloc = 0;
4182 journal->j_next_full_flush = 0;
4183 journal->j_next_async_flush = 0;
4184 init_journal_hash(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004185
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004186 // make sure reiserfs_add_jh sees the new current_jl before we
4187 // write out the tails
4188 smp_mb();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004189
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004190 /* tail conversion targets have to hit the disk before we end the
4191 * transaction. Otherwise a later transaction might repack the tail
4192 * before this transaction commits, leaving the data block unflushed and
4193 * clean, if we crash before the later transaction commits, the data block
4194 * is lost.
4195 */
4196 if (!list_empty(&jl->j_tail_bh_list)) {
4197 unlock_kernel();
4198 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4199 journal, jl, &jl->j_tail_bh_list);
4200 lock_kernel();
4201 }
Eric Sesterhenn14a61442006-10-03 23:36:38 +02004202 BUG_ON(!list_empty(&jl->j_tail_bh_list));
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004203 up(&jl->j_commit_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004204
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004205 /* honor the flush wishes from the caller, simple commits can
4206 ** be done outside the journal lock, they are done below
4207 **
4208 ** if we don't flush the commit list right now, we put it into
4209 ** the work queue so the people waiting on the async progress work
4210 ** queue don't wait for this proc to flush journal lists and such.
4211 */
4212 if (flush) {
4213 flush_commit_list(p_s_sb, jl, 1);
4214 flush_journal_list(p_s_sb, jl, 1);
4215 } else if (!(jl->j_state & LIST_COMMIT_PENDING))
4216 queue_delayed_work(commit_wq, &journal->j_work, HZ / 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004217
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004218 /* if the next transaction has any chance of wrapping, flush
4219 ** transactions that might get overwritten. If any journal lists are very
4220 ** old flush them as well.
4221 */
4222 first_jl:
4223 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4224 temp_jl = JOURNAL_LIST_ENTRY(entry);
4225 if (journal->j_start <= temp_jl->j_start) {
4226 if ((journal->j_start + journal->j_trans_max + 1) >=
4227 temp_jl->j_start) {
4228 flush_used_journal_lists(p_s_sb, temp_jl);
4229 goto first_jl;
4230 } else if ((journal->j_start +
4231 journal->j_trans_max + 1) <
4232 SB_ONDISK_JOURNAL_SIZE(p_s_sb)) {
4233 /* if we don't cross into the next transaction and we don't
4234 * wrap, there is no way we can overlap any later transactions
4235 * break now
4236 */
4237 break;
4238 }
4239 } else if ((journal->j_start +
4240 journal->j_trans_max + 1) >
4241 SB_ONDISK_JOURNAL_SIZE(p_s_sb)) {
4242 if (((journal->j_start + journal->j_trans_max + 1) %
4243 SB_ONDISK_JOURNAL_SIZE(p_s_sb)) >=
4244 temp_jl->j_start) {
4245 flush_used_journal_lists(p_s_sb, temp_jl);
4246 goto first_jl;
4247 } else {
4248 /* we don't overlap anything from out start to the end of the
4249 * log, and our wrapped portion doesn't overlap anything at
4250 * the start of the log. We can break
4251 */
4252 break;
4253 }
4254 }
4255 }
4256 flush_old_journal_lists(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004257
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004258 journal->j_current_jl->j_list_bitmap =
4259 get_list_bitmap(p_s_sb, journal->j_current_jl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004260
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004261 if (!(journal->j_current_jl->j_list_bitmap)) {
4262 reiserfs_panic(p_s_sb,
4263 "journal-1996: do_journal_end, could not get a list bitmap\n");
4264 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004265
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004266 atomic_set(&(journal->j_jlock), 0);
4267 unlock_journal(p_s_sb);
4268 /* wake up any body waiting to join. */
4269 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4270 wake_up(&(journal->j_join_wait));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004271
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004272 if (!flush && wait_on_commit &&
4273 journal_list_still_alive(p_s_sb, commit_trans_id)) {
4274 flush_commit_list(p_s_sb, jl, 1);
4275 }
4276 out:
4277 reiserfs_check_lock_depth(p_s_sb, "journal end2");
Linus Torvalds1da177e2005-04-16 15:20:36 -07004278
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004279 memset(th, 0, sizeof(*th));
4280 /* Re-set th->t_super, so we can properly keep track of how many
4281 * persistent transactions there are. We need to do this so if this
4282 * call is part of a failed restart_transaction, we can free it later */
4283 th->t_super = p_s_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004284
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004285 return journal->j_errno;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004286}
4287
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004288static void __reiserfs_journal_abort_hard(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004289{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004290 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4291 if (test_bit(J_ABORTED, &journal->j_state))
4292 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004293
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004294 printk(KERN_CRIT "REISERFS: Aborting journal for filesystem on %s\n",
4295 reiserfs_bdevname(sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004296
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004297 sb->s_flags |= MS_RDONLY;
4298 set_bit(J_ABORTED, &journal->j_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004299
4300#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004301 dump_stack();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004302#endif
4303}
4304
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004305static void __reiserfs_journal_abort_soft(struct super_block *sb, int errno)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004306{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004307 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4308 if (test_bit(J_ABORTED, &journal->j_state))
4309 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004310
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004311 if (!journal->j_errno)
4312 journal->j_errno = errno;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004313
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004314 __reiserfs_journal_abort_hard(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004315}
4316
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004317void reiserfs_journal_abort(struct super_block *sb, int errno)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004318{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004319 return __reiserfs_journal_abort_soft(sb, errno);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004320}