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1 /*
2 ** Write ahead logging implementation copyright Chris Mason 2000
3 **
4 ** The background commits make this code very interelated, and
5 ** overly complex.  I need to rethink things a bit....The major players:
6 **
7 ** journal_begin -- call with the number of blocks you expect to log.
8 **                  If the current transaction is too
9 ** 		    old, it will block until the current transaction is
10 ** 		    finished, and then start a new one.
11 **		    Usually, your transaction will get joined in with
12 **                  previous ones for speed.
13 **
14 ** journal_join  -- same as journal_begin, but won't block on the current
15 **                  transaction regardless of age.  Don't ever call
16 **                  this.  Ever.  There are only two places it should be
17 **                  called from, and they are both inside this file.
18 **
19 ** journal_mark_dirty -- adds blocks into this transaction.  clears any flags
20 **                       that might make them get sent to disk
21 **                       and then marks them BH_JDirty.  Puts the buffer head
22 **                       into the current transaction hash.
23 **
24 ** journal_end -- if the current transaction is batchable, it does nothing
25 **                   otherwise, it could do an async/synchronous commit, or
26 **                   a full flush of all log and real blocks in the
27 **                   transaction.
28 **
29 ** flush_old_commits -- if the current transaction is too old, it is ended and
30 **                      commit blocks are sent to disk.  Forces commit blocks
31 **                      to disk for all backgrounded commits that have been
32 **                      around too long.
33 **		     -- Note, if you call this as an immediate flush from
34 **		        from within kupdate, it will ignore the immediate flag
35 */
36 
37 #include <linux/time.h>
38 #include <linux/semaphore.h>
39 #include <linux/vmalloc.h>
40 #include <linux/reiserfs_fs.h>
41 #include <linux/kernel.h>
42 #include <linux/errno.h>
43 #include <linux/fcntl.h>
44 #include <linux/stat.h>
45 #include <linux/string.h>
46 #include <linux/smp_lock.h>
47 #include <linux/buffer_head.h>
48 #include <linux/workqueue.h>
49 #include <linux/writeback.h>
50 #include <linux/blkdev.h>
51 #include <linux/backing-dev.h>
52 #include <linux/uaccess.h>
53 
54 #include <asm/system.h>
55 
56 /* gets a struct reiserfs_journal_list * from a list head */
57 #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
58                                j_list))
59 #define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
60                                j_working_list))
61 
62 /* the number of mounted filesystems.  This is used to decide when to
63 ** start and kill the commit workqueue
64 */
65 static int reiserfs_mounted_fs_count;
66 
67 static struct workqueue_struct *commit_wq;
68 
69 #define JOURNAL_TRANS_HALF 1018	/* must be correct to keep the desc and commit
70 				   structs at 4k */
71 #define BUFNR 64		/*read ahead */
72 
73 /* cnode stat bits.  Move these into reiserfs_fs.h */
74 
75 #define BLOCK_FREED 2		/* this block was freed, and can't be written.  */
76 #define BLOCK_FREED_HOLDER 3	/* this block was freed during this transaction, and can't be written */
77 
78 #define BLOCK_NEEDS_FLUSH 4	/* used in flush_journal_list */
79 #define BLOCK_DIRTIED 5
80 
81 /* journal list state bits */
82 #define LIST_TOUCHED 1
83 #define LIST_DIRTY   2
84 #define LIST_COMMIT_PENDING  4	/* someone will commit this list */
85 
86 /* flags for do_journal_end */
87 #define FLUSH_ALL   1		/* flush commit and real blocks */
88 #define COMMIT_NOW  2		/* end and commit this transaction */
89 #define WAIT        4		/* wait for the log blocks to hit the disk */
90 
91 static int do_journal_end(struct reiserfs_transaction_handle *,
92 			  struct super_block *, unsigned long nblocks,
93 			  int flags);
94 static int flush_journal_list(struct super_block *s,
95 			      struct reiserfs_journal_list *jl, int flushall);
96 static int flush_commit_list(struct super_block *s,
97 			     struct reiserfs_journal_list *jl, int flushall);
98 static int can_dirty(struct reiserfs_journal_cnode *cn);
99 static int journal_join(struct reiserfs_transaction_handle *th,
100 			struct super_block *p_s_sb, unsigned long nblocks);
101 static int release_journal_dev(struct super_block *super,
102 			       struct reiserfs_journal *journal);
103 static int dirty_one_transaction(struct super_block *s,
104 				 struct reiserfs_journal_list *jl);
105 static void flush_async_commits(struct work_struct *work);
106 static void queue_log_writer(struct super_block *s);
107 
108 /* values for join in do_journal_begin_r */
109 enum {
110 	JBEGIN_REG = 0,		/* regular journal begin */
111 	JBEGIN_JOIN = 1,	/* join the running transaction if at all possible */
112 	JBEGIN_ABORT = 2,	/* called from cleanup code, ignores aborted flag */
113 };
114 
115 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
116 			      struct super_block *p_s_sb,
117 			      unsigned long nblocks, int join);
118 
init_journal_hash(struct super_block * p_s_sb)119 static void init_journal_hash(struct super_block *p_s_sb)
120 {
121 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
122 	memset(journal->j_hash_table, 0,
123 	       JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
124 }
125 
126 /*
127 ** clears BH_Dirty and sticks the buffer on the clean list.  Called because I can't allow refile_buffer to
128 ** make schedule happen after I've freed a block.  Look at remove_from_transaction and journal_mark_freed for
129 ** more details.
130 */
reiserfs_clean_and_file_buffer(struct buffer_head * bh)131 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
132 {
133 	if (bh) {
134 		clear_buffer_dirty(bh);
135 		clear_buffer_journal_test(bh);
136 	}
137 	return 0;
138 }
139 
disable_barrier(struct super_block * s)140 static void disable_barrier(struct super_block *s)
141 {
142 	REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_BARRIER_FLUSH);
143 	printk("reiserfs: disabling flush barriers on %s\n",
144 	       reiserfs_bdevname(s));
145 }
146 
allocate_bitmap_node(struct super_block * p_s_sb)147 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
148 							 *p_s_sb)
149 {
150 	struct reiserfs_bitmap_node *bn;
151 	static int id;
152 
153 	bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
154 	if (!bn) {
155 		return NULL;
156 	}
157 	bn->data = kzalloc(p_s_sb->s_blocksize, GFP_NOFS);
158 	if (!bn->data) {
159 		kfree(bn);
160 		return NULL;
161 	}
162 	bn->id = id++;
163 	INIT_LIST_HEAD(&bn->list);
164 	return bn;
165 }
166 
get_bitmap_node(struct super_block * p_s_sb)167 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *p_s_sb)
168 {
169 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
170 	struct reiserfs_bitmap_node *bn = NULL;
171 	struct list_head *entry = journal->j_bitmap_nodes.next;
172 
173 	journal->j_used_bitmap_nodes++;
174       repeat:
175 
176 	if (entry != &journal->j_bitmap_nodes) {
177 		bn = list_entry(entry, struct reiserfs_bitmap_node, list);
178 		list_del(entry);
179 		memset(bn->data, 0, p_s_sb->s_blocksize);
180 		journal->j_free_bitmap_nodes--;
181 		return bn;
182 	}
183 	bn = allocate_bitmap_node(p_s_sb);
184 	if (!bn) {
185 		yield();
186 		goto repeat;
187 	}
188 	return bn;
189 }
free_bitmap_node(struct super_block * p_s_sb,struct reiserfs_bitmap_node * bn)190 static inline void free_bitmap_node(struct super_block *p_s_sb,
191 				    struct reiserfs_bitmap_node *bn)
192 {
193 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
194 	journal->j_used_bitmap_nodes--;
195 	if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
196 		kfree(bn->data);
197 		kfree(bn);
198 	} else {
199 		list_add(&bn->list, &journal->j_bitmap_nodes);
200 		journal->j_free_bitmap_nodes++;
201 	}
202 }
203 
allocate_bitmap_nodes(struct super_block * p_s_sb)204 static void allocate_bitmap_nodes(struct super_block *p_s_sb)
205 {
206 	int i;
207 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
208 	struct reiserfs_bitmap_node *bn = NULL;
209 	for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
210 		bn = allocate_bitmap_node(p_s_sb);
211 		if (bn) {
212 			list_add(&bn->list, &journal->j_bitmap_nodes);
213 			journal->j_free_bitmap_nodes++;
214 		} else {
215 			break;	// this is ok, we'll try again when more are needed
216 		}
217 	}
218 }
219 
set_bit_in_list_bitmap(struct super_block * p_s_sb,b_blocknr_t block,struct reiserfs_list_bitmap * jb)220 static int set_bit_in_list_bitmap(struct super_block *p_s_sb,
221 				  b_blocknr_t block,
222 				  struct reiserfs_list_bitmap *jb)
223 {
224 	unsigned int bmap_nr = block / (p_s_sb->s_blocksize << 3);
225 	unsigned int bit_nr = block % (p_s_sb->s_blocksize << 3);
226 
227 	if (!jb->bitmaps[bmap_nr]) {
228 		jb->bitmaps[bmap_nr] = get_bitmap_node(p_s_sb);
229 	}
230 	set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
231 	return 0;
232 }
233 
cleanup_bitmap_list(struct super_block * p_s_sb,struct reiserfs_list_bitmap * jb)234 static void cleanup_bitmap_list(struct super_block *p_s_sb,
235 				struct reiserfs_list_bitmap *jb)
236 {
237 	int i;
238 	if (jb->bitmaps == NULL)
239 		return;
240 
241 	for (i = 0; i < reiserfs_bmap_count(p_s_sb); i++) {
242 		if (jb->bitmaps[i]) {
243 			free_bitmap_node(p_s_sb, jb->bitmaps[i]);
244 			jb->bitmaps[i] = NULL;
245 		}
246 	}
247 }
248 
249 /*
250 ** only call this on FS unmount.
251 */
free_list_bitmaps(struct super_block * p_s_sb,struct reiserfs_list_bitmap * jb_array)252 static int free_list_bitmaps(struct super_block *p_s_sb,
253 			     struct reiserfs_list_bitmap *jb_array)
254 {
255 	int i;
256 	struct reiserfs_list_bitmap *jb;
257 	for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
258 		jb = jb_array + i;
259 		jb->journal_list = NULL;
260 		cleanup_bitmap_list(p_s_sb, jb);
261 		vfree(jb->bitmaps);
262 		jb->bitmaps = NULL;
263 	}
264 	return 0;
265 }
266 
free_bitmap_nodes(struct super_block * p_s_sb)267 static int free_bitmap_nodes(struct super_block *p_s_sb)
268 {
269 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
270 	struct list_head *next = journal->j_bitmap_nodes.next;
271 	struct reiserfs_bitmap_node *bn;
272 
273 	while (next != &journal->j_bitmap_nodes) {
274 		bn = list_entry(next, struct reiserfs_bitmap_node, list);
275 		list_del(next);
276 		kfree(bn->data);
277 		kfree(bn);
278 		next = journal->j_bitmap_nodes.next;
279 		journal->j_free_bitmap_nodes--;
280 	}
281 
282 	return 0;
283 }
284 
285 /*
286 ** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
287 ** jb_array is the array to be filled in.
288 */
reiserfs_allocate_list_bitmaps(struct super_block * p_s_sb,struct reiserfs_list_bitmap * jb_array,unsigned int bmap_nr)289 int reiserfs_allocate_list_bitmaps(struct super_block *p_s_sb,
290 				   struct reiserfs_list_bitmap *jb_array,
291 				   unsigned int bmap_nr)
292 {
293 	int i;
294 	int failed = 0;
295 	struct reiserfs_list_bitmap *jb;
296 	int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
297 
298 	for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
299 		jb = jb_array + i;
300 		jb->journal_list = NULL;
301 		jb->bitmaps = vmalloc(mem);
302 		if (!jb->bitmaps) {
303 			reiserfs_warning(p_s_sb,
304 					 "clm-2000, unable to allocate bitmaps for journal lists");
305 			failed = 1;
306 			break;
307 		}
308 		memset(jb->bitmaps, 0, mem);
309 	}
310 	if (failed) {
311 		free_list_bitmaps(p_s_sb, jb_array);
312 		return -1;
313 	}
314 	return 0;
315 }
316 
317 /*
318 ** find an available list bitmap.  If you can't find one, flush a commit list
319 ** and try again
320 */
get_list_bitmap(struct super_block * p_s_sb,struct reiserfs_journal_list * jl)321 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *p_s_sb,
322 						    struct reiserfs_journal_list
323 						    *jl)
324 {
325 	int i, j;
326 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
327 	struct reiserfs_list_bitmap *jb = NULL;
328 
329 	for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
330 		i = journal->j_list_bitmap_index;
331 		journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
332 		jb = journal->j_list_bitmap + i;
333 		if (journal->j_list_bitmap[i].journal_list) {
334 			flush_commit_list(p_s_sb,
335 					  journal->j_list_bitmap[i].
336 					  journal_list, 1);
337 			if (!journal->j_list_bitmap[i].journal_list) {
338 				break;
339 			}
340 		} else {
341 			break;
342 		}
343 	}
344 	if (jb->journal_list) {	/* double check to make sure if flushed correctly */
345 		return NULL;
346 	}
347 	jb->journal_list = jl;
348 	return jb;
349 }
350 
351 /*
352 ** allocates a new chunk of X nodes, and links them all together as a list.
353 ** Uses the cnode->next and cnode->prev pointers
354 ** returns NULL on failure
355 */
allocate_cnodes(int num_cnodes)356 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
357 {
358 	struct reiserfs_journal_cnode *head;
359 	int i;
360 	if (num_cnodes <= 0) {
361 		return NULL;
362 	}
363 	head = vmalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
364 	if (!head) {
365 		return NULL;
366 	}
367 	memset(head, 0, num_cnodes * sizeof(struct reiserfs_journal_cnode));
368 	head[0].prev = NULL;
369 	head[0].next = head + 1;
370 	for (i = 1; i < num_cnodes; i++) {
371 		head[i].prev = head + (i - 1);
372 		head[i].next = head + (i + 1);	/* if last one, overwrite it after the if */
373 	}
374 	head[num_cnodes - 1].next = NULL;
375 	return head;
376 }
377 
378 /*
379 ** pulls a cnode off the free list, or returns NULL on failure
380 */
get_cnode(struct super_block * p_s_sb)381 static struct reiserfs_journal_cnode *get_cnode(struct super_block *p_s_sb)
382 {
383 	struct reiserfs_journal_cnode *cn;
384 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
385 
386 	reiserfs_check_lock_depth(p_s_sb, "get_cnode");
387 
388 	if (journal->j_cnode_free <= 0) {
389 		return NULL;
390 	}
391 	journal->j_cnode_used++;
392 	journal->j_cnode_free--;
393 	cn = journal->j_cnode_free_list;
394 	if (!cn) {
395 		return cn;
396 	}
397 	if (cn->next) {
398 		cn->next->prev = NULL;
399 	}
400 	journal->j_cnode_free_list = cn->next;
401 	memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
402 	return cn;
403 }
404 
405 /*
406 ** returns a cnode to the free list
407 */
free_cnode(struct super_block * p_s_sb,struct reiserfs_journal_cnode * cn)408 static void free_cnode(struct super_block *p_s_sb,
409 		       struct reiserfs_journal_cnode *cn)
410 {
411 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
412 
413 	reiserfs_check_lock_depth(p_s_sb, "free_cnode");
414 
415 	journal->j_cnode_used--;
416 	journal->j_cnode_free++;
417 	/* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
418 	cn->next = journal->j_cnode_free_list;
419 	if (journal->j_cnode_free_list) {
420 		journal->j_cnode_free_list->prev = cn;
421 	}
422 	cn->prev = NULL;	/* not needed with the memset, but I might kill the memset, and forget to do this */
423 	journal->j_cnode_free_list = cn;
424 }
425 
clear_prepared_bits(struct buffer_head * bh)426 static void clear_prepared_bits(struct buffer_head *bh)
427 {
428 	clear_buffer_journal_prepared(bh);
429 	clear_buffer_journal_restore_dirty(bh);
430 }
431 
432 /* utility function to force a BUG if it is called without the big
433 ** kernel lock held.  caller is the string printed just before calling BUG()
434 */
reiserfs_check_lock_depth(struct super_block * sb,char * caller)435 void reiserfs_check_lock_depth(struct super_block *sb, char *caller)
436 {
437 #ifdef CONFIG_SMP
438 	if (current->lock_depth < 0) {
439 		reiserfs_panic(sb, "%s called without kernel lock held",
440 			       caller);
441 	}
442 #else
443 	;
444 #endif
445 }
446 
447 /* return a cnode with same dev, block number and size in table, or null if not found */
get_journal_hash_dev(struct super_block * sb,struct reiserfs_journal_cnode ** table,long bl)448 static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
449 								  super_block
450 								  *sb,
451 								  struct
452 								  reiserfs_journal_cnode
453 								  **table,
454 								  long bl)
455 {
456 	struct reiserfs_journal_cnode *cn;
457 	cn = journal_hash(table, sb, bl);
458 	while (cn) {
459 		if (cn->blocknr == bl && cn->sb == sb)
460 			return cn;
461 		cn = cn->hnext;
462 	}
463 	return (struct reiserfs_journal_cnode *)0;
464 }
465 
466 /*
467 ** this actually means 'can this block be reallocated yet?'.  If you set search_all, a block can only be allocated
468 ** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever
469 ** being overwritten by a replay after crashing.
470 **
471 ** If you don't set search_all, a block can only be allocated if it is not in the current transaction.  Since deleting
472 ** a block removes it from the current transaction, this case should never happen.  If you don't set search_all, make
473 ** sure you never write the block without logging it.
474 **
475 ** next_zero_bit is a suggestion about the next block to try for find_forward.
476 ** when bl is rejected because it is set in a journal list bitmap, we search
477 ** for the next zero bit in the bitmap that rejected bl.  Then, we return that
478 ** through next_zero_bit for find_forward to try.
479 **
480 ** Just because we return something in next_zero_bit does not mean we won't
481 ** reject it on the next call to reiserfs_in_journal
482 **
483 */
reiserfs_in_journal(struct super_block * p_s_sb,unsigned int bmap_nr,int bit_nr,int search_all,b_blocknr_t * next_zero_bit)484 int reiserfs_in_journal(struct super_block *p_s_sb,
485 			unsigned int bmap_nr, int bit_nr, int search_all,
486 			b_blocknr_t * next_zero_bit)
487 {
488 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
489 	struct reiserfs_journal_cnode *cn;
490 	struct reiserfs_list_bitmap *jb;
491 	int i;
492 	unsigned long bl;
493 
494 	*next_zero_bit = 0;	/* always start this at zero. */
495 
496 	PROC_INFO_INC(p_s_sb, journal.in_journal);
497 	/* If we aren't doing a search_all, this is a metablock, and it will be logged before use.
498 	 ** if we crash before the transaction that freed it commits,  this transaction won't
499 	 ** have committed either, and the block will never be written
500 	 */
501 	if (search_all) {
502 		for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
503 			PROC_INFO_INC(p_s_sb, journal.in_journal_bitmap);
504 			jb = journal->j_list_bitmap + i;
505 			if (jb->journal_list && jb->bitmaps[bmap_nr] &&
506 			    test_bit(bit_nr,
507 				     (unsigned long *)jb->bitmaps[bmap_nr]->
508 				     data)) {
509 				*next_zero_bit =
510 				    find_next_zero_bit((unsigned long *)
511 						       (jb->bitmaps[bmap_nr]->
512 							data),
513 						       p_s_sb->s_blocksize << 3,
514 						       bit_nr + 1);
515 				return 1;
516 			}
517 		}
518 	}
519 
520 	bl = bmap_nr * (p_s_sb->s_blocksize << 3) + bit_nr;
521 	/* is it in any old transactions? */
522 	if (search_all
523 	    && (cn =
524 		get_journal_hash_dev(p_s_sb, journal->j_list_hash_table, bl))) {
525 		return 1;
526 	}
527 
528 	/* is it in the current transaction.  This should never happen */
529 	if ((cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, bl))) {
530 		BUG();
531 		return 1;
532 	}
533 
534 	PROC_INFO_INC(p_s_sb, journal.in_journal_reusable);
535 	/* safe for reuse */
536 	return 0;
537 }
538 
539 /* insert cn into table
540 */
insert_journal_hash(struct reiserfs_journal_cnode ** table,struct reiserfs_journal_cnode * cn)541 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
542 				       struct reiserfs_journal_cnode *cn)
543 {
544 	struct reiserfs_journal_cnode *cn_orig;
545 
546 	cn_orig = journal_hash(table, cn->sb, cn->blocknr);
547 	cn->hnext = cn_orig;
548 	cn->hprev = NULL;
549 	if (cn_orig) {
550 		cn_orig->hprev = cn;
551 	}
552 	journal_hash(table, cn->sb, cn->blocknr) = cn;
553 }
554 
555 /* lock the current transaction */
lock_journal(struct super_block * p_s_sb)556 static inline void lock_journal(struct super_block *p_s_sb)
557 {
558 	PROC_INFO_INC(p_s_sb, journal.lock_journal);
559 	mutex_lock(&SB_JOURNAL(p_s_sb)->j_mutex);
560 }
561 
562 /* unlock the current transaction */
unlock_journal(struct super_block * p_s_sb)563 static inline void unlock_journal(struct super_block *p_s_sb)
564 {
565 	mutex_unlock(&SB_JOURNAL(p_s_sb)->j_mutex);
566 }
567 
get_journal_list(struct reiserfs_journal_list * jl)568 static inline void get_journal_list(struct reiserfs_journal_list *jl)
569 {
570 	jl->j_refcount++;
571 }
572 
put_journal_list(struct super_block * s,struct reiserfs_journal_list * jl)573 static inline void put_journal_list(struct super_block *s,
574 				    struct reiserfs_journal_list *jl)
575 {
576 	if (jl->j_refcount < 1) {
577 		reiserfs_panic(s, "trans id %lu, refcount at %d",
578 			       jl->j_trans_id, jl->j_refcount);
579 	}
580 	if (--jl->j_refcount == 0)
581 		kfree(jl);
582 }
583 
584 /*
585 ** this used to be much more involved, and I'm keeping it just in case things get ugly again.
586 ** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a
587 ** transaction.
588 */
cleanup_freed_for_journal_list(struct super_block * p_s_sb,struct reiserfs_journal_list * jl)589 static void cleanup_freed_for_journal_list(struct super_block *p_s_sb,
590 					   struct reiserfs_journal_list *jl)
591 {
592 
593 	struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
594 	if (jb) {
595 		cleanup_bitmap_list(p_s_sb, jb);
596 	}
597 	jl->j_list_bitmap->journal_list = NULL;
598 	jl->j_list_bitmap = NULL;
599 }
600 
journal_list_still_alive(struct super_block * s,unsigned long trans_id)601 static int journal_list_still_alive(struct super_block *s,
602 				    unsigned long trans_id)
603 {
604 	struct reiserfs_journal *journal = SB_JOURNAL(s);
605 	struct list_head *entry = &journal->j_journal_list;
606 	struct reiserfs_journal_list *jl;
607 
608 	if (!list_empty(entry)) {
609 		jl = JOURNAL_LIST_ENTRY(entry->next);
610 		if (jl->j_trans_id <= trans_id) {
611 			return 1;
612 		}
613 	}
614 	return 0;
615 }
616 
617 /*
618  * If page->mapping was null, we failed to truncate this page for
619  * some reason.  Most likely because it was truncated after being
620  * logged via data=journal.
621  *
622  * This does a check to see if the buffer belongs to one of these
623  * lost pages before doing the final put_bh.  If page->mapping was
624  * null, it tries to free buffers on the page, which should make the
625  * final page_cache_release drop the page from the lru.
626  */
release_buffer_page(struct buffer_head * bh)627 static void release_buffer_page(struct buffer_head *bh)
628 {
629 	struct page *page = bh->b_page;
630 	if (!page->mapping && trylock_page(page)) {
631 		page_cache_get(page);
632 		put_bh(bh);
633 		if (!page->mapping)
634 			try_to_free_buffers(page);
635 		unlock_page(page);
636 		page_cache_release(page);
637 	} else {
638 		put_bh(bh);
639 	}
640 }
641 
reiserfs_end_buffer_io_sync(struct buffer_head * bh,int uptodate)642 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
643 {
644 	char b[BDEVNAME_SIZE];
645 
646 	if (buffer_journaled(bh)) {
647 		reiserfs_warning(NULL,
648 				 "clm-2084: pinned buffer %lu:%s sent to disk",
649 				 bh->b_blocknr, bdevname(bh->b_bdev, b));
650 	}
651 	if (uptodate)
652 		set_buffer_uptodate(bh);
653 	else
654 		clear_buffer_uptodate(bh);
655 
656 	unlock_buffer(bh);
657 	release_buffer_page(bh);
658 }
659 
reiserfs_end_ordered_io(struct buffer_head * bh,int uptodate)660 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
661 {
662 	if (uptodate)
663 		set_buffer_uptodate(bh);
664 	else
665 		clear_buffer_uptodate(bh);
666 	unlock_buffer(bh);
667 	put_bh(bh);
668 }
669 
submit_logged_buffer(struct buffer_head * bh)670 static void submit_logged_buffer(struct buffer_head *bh)
671 {
672 	get_bh(bh);
673 	bh->b_end_io = reiserfs_end_buffer_io_sync;
674 	clear_buffer_journal_new(bh);
675 	clear_buffer_dirty(bh);
676 	if (!test_clear_buffer_journal_test(bh))
677 		BUG();
678 	if (!buffer_uptodate(bh))
679 		BUG();
680 	submit_bh(WRITE, bh);
681 }
682 
submit_ordered_buffer(struct buffer_head * bh)683 static void submit_ordered_buffer(struct buffer_head *bh)
684 {
685 	get_bh(bh);
686 	bh->b_end_io = reiserfs_end_ordered_io;
687 	clear_buffer_dirty(bh);
688 	if (!buffer_uptodate(bh))
689 		BUG();
690 	submit_bh(WRITE, bh);
691 }
692 
submit_barrier_buffer(struct buffer_head * bh)693 static int submit_barrier_buffer(struct buffer_head *bh)
694 {
695 	get_bh(bh);
696 	bh->b_end_io = reiserfs_end_ordered_io;
697 	clear_buffer_dirty(bh);
698 	if (!buffer_uptodate(bh))
699 		BUG();
700 	return submit_bh(WRITE_BARRIER, bh);
701 }
702 
check_barrier_completion(struct super_block * s,struct buffer_head * bh)703 static void check_barrier_completion(struct super_block *s,
704 				     struct buffer_head *bh)
705 {
706 	if (buffer_eopnotsupp(bh)) {
707 		clear_buffer_eopnotsupp(bh);
708 		disable_barrier(s);
709 		set_buffer_uptodate(bh);
710 		set_buffer_dirty(bh);
711 		sync_dirty_buffer(bh);
712 	}
713 }
714 
715 #define CHUNK_SIZE 32
716 struct buffer_chunk {
717 	struct buffer_head *bh[CHUNK_SIZE];
718 	int nr;
719 };
720 
write_chunk(struct buffer_chunk * chunk)721 static void write_chunk(struct buffer_chunk *chunk)
722 {
723 	int i;
724 	get_fs_excl();
725 	for (i = 0; i < chunk->nr; i++) {
726 		submit_logged_buffer(chunk->bh[i]);
727 	}
728 	chunk->nr = 0;
729 	put_fs_excl();
730 }
731 
write_ordered_chunk(struct buffer_chunk * chunk)732 static void write_ordered_chunk(struct buffer_chunk *chunk)
733 {
734 	int i;
735 	get_fs_excl();
736 	for (i = 0; i < chunk->nr; i++) {
737 		submit_ordered_buffer(chunk->bh[i]);
738 	}
739 	chunk->nr = 0;
740 	put_fs_excl();
741 }
742 
add_to_chunk(struct buffer_chunk * chunk,struct buffer_head * bh,spinlock_t * lock,void (fn)(struct buffer_chunk *))743 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
744 			spinlock_t * lock, void (fn) (struct buffer_chunk *))
745 {
746 	int ret = 0;
747 	BUG_ON(chunk->nr >= CHUNK_SIZE);
748 	chunk->bh[chunk->nr++] = bh;
749 	if (chunk->nr >= CHUNK_SIZE) {
750 		ret = 1;
751 		if (lock)
752 			spin_unlock(lock);
753 		fn(chunk);
754 		if (lock)
755 			spin_lock(lock);
756 	}
757 	return ret;
758 }
759 
760 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
alloc_jh(void)761 static struct reiserfs_jh *alloc_jh(void)
762 {
763 	struct reiserfs_jh *jh;
764 	while (1) {
765 		jh = kmalloc(sizeof(*jh), GFP_NOFS);
766 		if (jh) {
767 			atomic_inc(&nr_reiserfs_jh);
768 			return jh;
769 		}
770 		yield();
771 	}
772 }
773 
774 /*
775  * we want to free the jh when the buffer has been written
776  * and waited on
777  */
reiserfs_free_jh(struct buffer_head * bh)778 void reiserfs_free_jh(struct buffer_head *bh)
779 {
780 	struct reiserfs_jh *jh;
781 
782 	jh = bh->b_private;
783 	if (jh) {
784 		bh->b_private = NULL;
785 		jh->bh = NULL;
786 		list_del_init(&jh->list);
787 		kfree(jh);
788 		if (atomic_read(&nr_reiserfs_jh) <= 0)
789 			BUG();
790 		atomic_dec(&nr_reiserfs_jh);
791 		put_bh(bh);
792 	}
793 }
794 
__add_jh(struct reiserfs_journal * j,struct buffer_head * bh,int tail)795 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
796 			   int tail)
797 {
798 	struct reiserfs_jh *jh;
799 
800 	if (bh->b_private) {
801 		spin_lock(&j->j_dirty_buffers_lock);
802 		if (!bh->b_private) {
803 			spin_unlock(&j->j_dirty_buffers_lock);
804 			goto no_jh;
805 		}
806 		jh = bh->b_private;
807 		list_del_init(&jh->list);
808 	} else {
809 	      no_jh:
810 		get_bh(bh);
811 		jh = alloc_jh();
812 		spin_lock(&j->j_dirty_buffers_lock);
813 		/* buffer must be locked for __add_jh, should be able to have
814 		 * two adds at the same time
815 		 */
816 		BUG_ON(bh->b_private);
817 		jh->bh = bh;
818 		bh->b_private = jh;
819 	}
820 	jh->jl = j->j_current_jl;
821 	if (tail)
822 		list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
823 	else {
824 		list_add_tail(&jh->list, &jh->jl->j_bh_list);
825 	}
826 	spin_unlock(&j->j_dirty_buffers_lock);
827 	return 0;
828 }
829 
reiserfs_add_tail_list(struct inode * inode,struct buffer_head * bh)830 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
831 {
832 	return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
833 }
reiserfs_add_ordered_list(struct inode * inode,struct buffer_head * bh)834 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
835 {
836 	return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
837 }
838 
839 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
write_ordered_buffers(spinlock_t * lock,struct reiserfs_journal * j,struct reiserfs_journal_list * jl,struct list_head * list)840 static int write_ordered_buffers(spinlock_t * lock,
841 				 struct reiserfs_journal *j,
842 				 struct reiserfs_journal_list *jl,
843 				 struct list_head *list)
844 {
845 	struct buffer_head *bh;
846 	struct reiserfs_jh *jh;
847 	int ret = j->j_errno;
848 	struct buffer_chunk chunk;
849 	struct list_head tmp;
850 	INIT_LIST_HEAD(&tmp);
851 
852 	chunk.nr = 0;
853 	spin_lock(lock);
854 	while (!list_empty(list)) {
855 		jh = JH_ENTRY(list->next);
856 		bh = jh->bh;
857 		get_bh(bh);
858 		if (!trylock_buffer(bh)) {
859 			if (!buffer_dirty(bh)) {
860 				list_move(&jh->list, &tmp);
861 				goto loop_next;
862 			}
863 			spin_unlock(lock);
864 			if (chunk.nr)
865 				write_ordered_chunk(&chunk);
866 			wait_on_buffer(bh);
867 			cond_resched();
868 			spin_lock(lock);
869 			goto loop_next;
870 		}
871 		/* in theory, dirty non-uptodate buffers should never get here,
872 		 * but the upper layer io error paths still have a few quirks.
873 		 * Handle them here as gracefully as we can
874 		 */
875 		if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
876 			clear_buffer_dirty(bh);
877 			ret = -EIO;
878 		}
879 		if (buffer_dirty(bh)) {
880 			list_move(&jh->list, &tmp);
881 			add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
882 		} else {
883 			reiserfs_free_jh(bh);
884 			unlock_buffer(bh);
885 		}
886 	      loop_next:
887 		put_bh(bh);
888 		cond_resched_lock(lock);
889 	}
890 	if (chunk.nr) {
891 		spin_unlock(lock);
892 		write_ordered_chunk(&chunk);
893 		spin_lock(lock);
894 	}
895 	while (!list_empty(&tmp)) {
896 		jh = JH_ENTRY(tmp.prev);
897 		bh = jh->bh;
898 		get_bh(bh);
899 		reiserfs_free_jh(bh);
900 
901 		if (buffer_locked(bh)) {
902 			spin_unlock(lock);
903 			wait_on_buffer(bh);
904 			spin_lock(lock);
905 		}
906 		if (!buffer_uptodate(bh)) {
907 			ret = -EIO;
908 		}
909 		/* ugly interaction with invalidatepage here.
910 		 * reiserfs_invalidate_page will pin any buffer that has a valid
911 		 * journal head from an older transaction.  If someone else sets
912 		 * our buffer dirty after we write it in the first loop, and
913 		 * then someone truncates the page away, nobody will ever write
914 		 * the buffer. We're safe if we write the page one last time
915 		 * after freeing the journal header.
916 		 */
917 		if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
918 			spin_unlock(lock);
919 			ll_rw_block(WRITE, 1, &bh);
920 			spin_lock(lock);
921 		}
922 		put_bh(bh);
923 		cond_resched_lock(lock);
924 	}
925 	spin_unlock(lock);
926 	return ret;
927 }
928 
flush_older_commits(struct super_block * s,struct reiserfs_journal_list * jl)929 static int flush_older_commits(struct super_block *s,
930 			       struct reiserfs_journal_list *jl)
931 {
932 	struct reiserfs_journal *journal = SB_JOURNAL(s);
933 	struct reiserfs_journal_list *other_jl;
934 	struct reiserfs_journal_list *first_jl;
935 	struct list_head *entry;
936 	unsigned long trans_id = jl->j_trans_id;
937 	unsigned long other_trans_id;
938 	unsigned long first_trans_id;
939 
940       find_first:
941 	/*
942 	 * first we walk backwards to find the oldest uncommitted transation
943 	 */
944 	first_jl = jl;
945 	entry = jl->j_list.prev;
946 	while (1) {
947 		other_jl = JOURNAL_LIST_ENTRY(entry);
948 		if (entry == &journal->j_journal_list ||
949 		    atomic_read(&other_jl->j_older_commits_done))
950 			break;
951 
952 		first_jl = other_jl;
953 		entry = other_jl->j_list.prev;
954 	}
955 
956 	/* if we didn't find any older uncommitted transactions, return now */
957 	if (first_jl == jl) {
958 		return 0;
959 	}
960 
961 	first_trans_id = first_jl->j_trans_id;
962 
963 	entry = &first_jl->j_list;
964 	while (1) {
965 		other_jl = JOURNAL_LIST_ENTRY(entry);
966 		other_trans_id = other_jl->j_trans_id;
967 
968 		if (other_trans_id < trans_id) {
969 			if (atomic_read(&other_jl->j_commit_left) != 0) {
970 				flush_commit_list(s, other_jl, 0);
971 
972 				/* list we were called with is gone, return */
973 				if (!journal_list_still_alive(s, trans_id))
974 					return 1;
975 
976 				/* the one we just flushed is gone, this means all
977 				 * older lists are also gone, so first_jl is no longer
978 				 * valid either.  Go back to the beginning.
979 				 */
980 				if (!journal_list_still_alive
981 				    (s, other_trans_id)) {
982 					goto find_first;
983 				}
984 			}
985 			entry = entry->next;
986 			if (entry == &journal->j_journal_list)
987 				return 0;
988 		} else {
989 			return 0;
990 		}
991 	}
992 	return 0;
993 }
994 
reiserfs_async_progress_wait(struct super_block * s)995 static int reiserfs_async_progress_wait(struct super_block *s)
996 {
997 	DEFINE_WAIT(wait);
998 	struct reiserfs_journal *j = SB_JOURNAL(s);
999 	if (atomic_read(&j->j_async_throttle))
1000 		congestion_wait(WRITE, HZ / 10);
1001 	return 0;
1002 }
1003 
1004 /*
1005 ** if this journal list still has commit blocks unflushed, send them to disk.
1006 **
1007 ** log areas must be flushed in order (transaction 2 can't commit before transaction 1)
1008 ** Before the commit block can by written, every other log block must be safely on disk
1009 **
1010 */
flush_commit_list(struct super_block * s,struct reiserfs_journal_list * jl,int flushall)1011 static int flush_commit_list(struct super_block *s,
1012 			     struct reiserfs_journal_list *jl, int flushall)
1013 {
1014 	int i;
1015 	b_blocknr_t bn;
1016 	struct buffer_head *tbh = NULL;
1017 	unsigned long trans_id = jl->j_trans_id;
1018 	struct reiserfs_journal *journal = SB_JOURNAL(s);
1019 	int barrier = 0;
1020 	int retval = 0;
1021 	int write_len;
1022 
1023 	reiserfs_check_lock_depth(s, "flush_commit_list");
1024 
1025 	if (atomic_read(&jl->j_older_commits_done)) {
1026 		return 0;
1027 	}
1028 
1029 	get_fs_excl();
1030 
1031 	/* before we can put our commit blocks on disk, we have to make sure everyone older than
1032 	 ** us is on disk too
1033 	 */
1034 	BUG_ON(jl->j_len <= 0);
1035 	BUG_ON(trans_id == journal->j_trans_id);
1036 
1037 	get_journal_list(jl);
1038 	if (flushall) {
1039 		if (flush_older_commits(s, jl) == 1) {
1040 			/* list disappeared during flush_older_commits.  return */
1041 			goto put_jl;
1042 		}
1043 	}
1044 
1045 	/* make sure nobody is trying to flush this one at the same time */
1046 	mutex_lock(&jl->j_commit_mutex);
1047 	if (!journal_list_still_alive(s, trans_id)) {
1048 		mutex_unlock(&jl->j_commit_mutex);
1049 		goto put_jl;
1050 	}
1051 	BUG_ON(jl->j_trans_id == 0);
1052 
1053 	/* this commit is done, exit */
1054 	if (atomic_read(&(jl->j_commit_left)) <= 0) {
1055 		if (flushall) {
1056 			atomic_set(&(jl->j_older_commits_done), 1);
1057 		}
1058 		mutex_unlock(&jl->j_commit_mutex);
1059 		goto put_jl;
1060 	}
1061 
1062 	if (!list_empty(&jl->j_bh_list)) {
1063 		int ret;
1064 		unlock_kernel();
1065 		ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1066 					    journal, jl, &jl->j_bh_list);
1067 		if (ret < 0 && retval == 0)
1068 			retval = ret;
1069 		lock_kernel();
1070 	}
1071 	BUG_ON(!list_empty(&jl->j_bh_list));
1072 	/*
1073 	 * for the description block and all the log blocks, submit any buffers
1074 	 * that haven't already reached the disk.  Try to write at least 256
1075 	 * log blocks. later on, we will only wait on blocks that correspond
1076 	 * to this transaction, but while we're unplugging we might as well
1077 	 * get a chunk of data on there.
1078 	 */
1079 	atomic_inc(&journal->j_async_throttle);
1080 	write_len = jl->j_len + 1;
1081 	if (write_len < 256)
1082 		write_len = 256;
1083 	for (i = 0 ; i < write_len ; i++) {
1084 		bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1085 		    SB_ONDISK_JOURNAL_SIZE(s);
1086 		tbh = journal_find_get_block(s, bn);
1087 		if (tbh) {
1088 			if (buffer_dirty(tbh))
1089 			    ll_rw_block(WRITE, 1, &tbh) ;
1090 			put_bh(tbh) ;
1091 		}
1092 	}
1093 	atomic_dec(&journal->j_async_throttle);
1094 
1095 	/* We're skipping the commit if there's an error */
1096 	if (retval || reiserfs_is_journal_aborted(journal))
1097 		barrier = 0;
1098 
1099 	/* wait on everything written so far before writing the commit
1100 	 * if we are in barrier mode, send the commit down now
1101 	 */
1102 	barrier = reiserfs_barrier_flush(s);
1103 	if (barrier) {
1104 		int ret;
1105 		lock_buffer(jl->j_commit_bh);
1106 		ret = submit_barrier_buffer(jl->j_commit_bh);
1107 		if (ret == -EOPNOTSUPP) {
1108 			set_buffer_uptodate(jl->j_commit_bh);
1109 			disable_barrier(s);
1110 			barrier = 0;
1111 		}
1112 	}
1113 	for (i = 0; i < (jl->j_len + 1); i++) {
1114 		bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1115 		    (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1116 		tbh = journal_find_get_block(s, bn);
1117 		wait_on_buffer(tbh);
1118 		// since we're using ll_rw_blk above, it might have skipped over
1119 		// a locked buffer.  Double check here
1120 		//
1121 		if (buffer_dirty(tbh))	/* redundant, sync_dirty_buffer() checks */
1122 			sync_dirty_buffer(tbh);
1123 		if (unlikely(!buffer_uptodate(tbh))) {
1124 #ifdef CONFIG_REISERFS_CHECK
1125 			reiserfs_warning(s, "journal-601, buffer write failed");
1126 #endif
1127 			retval = -EIO;
1128 		}
1129 		put_bh(tbh);	/* once for journal_find_get_block */
1130 		put_bh(tbh);	/* once due to original getblk in do_journal_end */
1131 		atomic_dec(&(jl->j_commit_left));
1132 	}
1133 
1134 	BUG_ON(atomic_read(&(jl->j_commit_left)) != 1);
1135 
1136 	if (!barrier) {
1137 		/* If there was a write error in the journal - we can't commit
1138 		 * this transaction - it will be invalid and, if successful,
1139 		 * will just end up propagating the write error out to
1140 		 * the file system. */
1141 		if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1142 			if (buffer_dirty(jl->j_commit_bh))
1143 				BUG();
1144 			mark_buffer_dirty(jl->j_commit_bh) ;
1145 			sync_dirty_buffer(jl->j_commit_bh) ;
1146 		}
1147 	} else
1148 		wait_on_buffer(jl->j_commit_bh);
1149 
1150 	check_barrier_completion(s, jl->j_commit_bh);
1151 
1152 	/* If there was a write error in the journal - we can't commit this
1153 	 * transaction - it will be invalid and, if successful, will just end
1154 	 * up propagating the write error out to the filesystem. */
1155 	if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1156 #ifdef CONFIG_REISERFS_CHECK
1157 		reiserfs_warning(s, "journal-615: buffer write failed");
1158 #endif
1159 		retval = -EIO;
1160 	}
1161 	bforget(jl->j_commit_bh);
1162 	if (journal->j_last_commit_id != 0 &&
1163 	    (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1164 		reiserfs_warning(s, "clm-2200: last commit %lu, current %lu",
1165 				 journal->j_last_commit_id, jl->j_trans_id);
1166 	}
1167 	journal->j_last_commit_id = jl->j_trans_id;
1168 
1169 	/* now, every commit block is on the disk.  It is safe to allow blocks freed during this transaction to be reallocated */
1170 	cleanup_freed_for_journal_list(s, jl);
1171 
1172 	retval = retval ? retval : journal->j_errno;
1173 
1174 	/* mark the metadata dirty */
1175 	if (!retval)
1176 		dirty_one_transaction(s, jl);
1177 	atomic_dec(&(jl->j_commit_left));
1178 
1179 	if (flushall) {
1180 		atomic_set(&(jl->j_older_commits_done), 1);
1181 	}
1182 	mutex_unlock(&jl->j_commit_mutex);
1183       put_jl:
1184 	put_journal_list(s, jl);
1185 
1186 	if (retval)
1187 		reiserfs_abort(s, retval, "Journal write error in %s",
1188 			       __func__);
1189 	put_fs_excl();
1190 	return retval;
1191 }
1192 
1193 /*
1194 ** flush_journal_list frequently needs to find a newer transaction for a given block.  This does that, or
1195 ** returns NULL if it can't find anything
1196 */
find_newer_jl_for_cn(struct reiserfs_journal_cnode * cn)1197 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1198 							  reiserfs_journal_cnode
1199 							  *cn)
1200 {
1201 	struct super_block *sb = cn->sb;
1202 	b_blocknr_t blocknr = cn->blocknr;
1203 
1204 	cn = cn->hprev;
1205 	while (cn) {
1206 		if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1207 			return cn->jlist;
1208 		}
1209 		cn = cn->hprev;
1210 	}
1211 	return NULL;
1212 }
1213 
newer_jl_done(struct reiserfs_journal_cnode * cn)1214 static int newer_jl_done(struct reiserfs_journal_cnode *cn)
1215 {
1216 	struct super_block *sb = cn->sb;
1217 	b_blocknr_t blocknr = cn->blocknr;
1218 
1219 	cn = cn->hprev;
1220 	while (cn) {
1221 		if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist &&
1222 		    atomic_read(&cn->jlist->j_commit_left) != 0)
1223 				    return 0;
1224 		cn = cn->hprev;
1225 	}
1226 	return 1;
1227 }
1228 
1229 static void remove_journal_hash(struct super_block *,
1230 				struct reiserfs_journal_cnode **,
1231 				struct reiserfs_journal_list *, unsigned long,
1232 				int);
1233 
1234 /*
1235 ** once all the real blocks have been flushed, it is safe to remove them from the
1236 ** journal list for this transaction.  Aside from freeing the cnode, this also allows the
1237 ** block to be reallocated for data blocks if it had been deleted.
1238 */
remove_all_from_journal_list(struct super_block * p_s_sb,struct reiserfs_journal_list * jl,int debug)1239 static void remove_all_from_journal_list(struct super_block *p_s_sb,
1240 					 struct reiserfs_journal_list *jl,
1241 					 int debug)
1242 {
1243 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
1244 	struct reiserfs_journal_cnode *cn, *last;
1245 	cn = jl->j_realblock;
1246 
1247 	/* which is better, to lock once around the whole loop, or
1248 	 ** to lock for each call to remove_journal_hash?
1249 	 */
1250 	while (cn) {
1251 		if (cn->blocknr != 0) {
1252 			if (debug) {
1253 				reiserfs_warning(p_s_sb,
1254 						 "block %u, bh is %d, state %ld",
1255 						 cn->blocknr, cn->bh ? 1 : 0,
1256 						 cn->state);
1257 			}
1258 			cn->state = 0;
1259 			remove_journal_hash(p_s_sb, journal->j_list_hash_table,
1260 					    jl, cn->blocknr, 1);
1261 		}
1262 		last = cn;
1263 		cn = cn->next;
1264 		free_cnode(p_s_sb, last);
1265 	}
1266 	jl->j_realblock = NULL;
1267 }
1268 
1269 /*
1270 ** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block.
1271 ** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start
1272 ** releasing blocks in this transaction for reuse as data blocks.
1273 ** called by flush_journal_list, before it calls remove_all_from_journal_list
1274 **
1275 */
_update_journal_header_block(struct super_block * p_s_sb,unsigned long offset,unsigned long trans_id)1276 static int _update_journal_header_block(struct super_block *p_s_sb,
1277 					unsigned long offset,
1278 					unsigned long trans_id)
1279 {
1280 	struct reiserfs_journal_header *jh;
1281 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
1282 
1283 	if (reiserfs_is_journal_aborted(journal))
1284 		return -EIO;
1285 
1286 	if (trans_id >= journal->j_last_flush_trans_id) {
1287 		if (buffer_locked((journal->j_header_bh))) {
1288 			wait_on_buffer((journal->j_header_bh));
1289 			if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1290 #ifdef CONFIG_REISERFS_CHECK
1291 				reiserfs_warning(p_s_sb,
1292 						 "journal-699: buffer write failed");
1293 #endif
1294 				return -EIO;
1295 			}
1296 		}
1297 		journal->j_last_flush_trans_id = trans_id;
1298 		journal->j_first_unflushed_offset = offset;
1299 		jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1300 							b_data);
1301 		jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1302 		jh->j_first_unflushed_offset = cpu_to_le32(offset);
1303 		jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1304 
1305 		if (reiserfs_barrier_flush(p_s_sb)) {
1306 			int ret;
1307 			lock_buffer(journal->j_header_bh);
1308 			ret = submit_barrier_buffer(journal->j_header_bh);
1309 			if (ret == -EOPNOTSUPP) {
1310 				set_buffer_uptodate(journal->j_header_bh);
1311 				disable_barrier(p_s_sb);
1312 				goto sync;
1313 			}
1314 			wait_on_buffer(journal->j_header_bh);
1315 			check_barrier_completion(p_s_sb, journal->j_header_bh);
1316 		} else {
1317 		      sync:
1318 			set_buffer_dirty(journal->j_header_bh);
1319 			sync_dirty_buffer(journal->j_header_bh);
1320 		}
1321 		if (!buffer_uptodate(journal->j_header_bh)) {
1322 			reiserfs_warning(p_s_sb,
1323 					 "journal-837: IO error during journal replay");
1324 			return -EIO;
1325 		}
1326 	}
1327 	return 0;
1328 }
1329 
update_journal_header_block(struct super_block * p_s_sb,unsigned long offset,unsigned long trans_id)1330 static int update_journal_header_block(struct super_block *p_s_sb,
1331 				       unsigned long offset,
1332 				       unsigned long trans_id)
1333 {
1334 	return _update_journal_header_block(p_s_sb, offset, trans_id);
1335 }
1336 
1337 /*
1338 ** flush any and all journal lists older than you are
1339 ** can only be called from flush_journal_list
1340 */
flush_older_journal_lists(struct super_block * p_s_sb,struct reiserfs_journal_list * jl)1341 static int flush_older_journal_lists(struct super_block *p_s_sb,
1342 				     struct reiserfs_journal_list *jl)
1343 {
1344 	struct list_head *entry;
1345 	struct reiserfs_journal_list *other_jl;
1346 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
1347 	unsigned long trans_id = jl->j_trans_id;
1348 
1349 	/* we know we are the only ones flushing things, no extra race
1350 	 * protection is required.
1351 	 */
1352       restart:
1353 	entry = journal->j_journal_list.next;
1354 	/* Did we wrap? */
1355 	if (entry == &journal->j_journal_list)
1356 		return 0;
1357 	other_jl = JOURNAL_LIST_ENTRY(entry);
1358 	if (other_jl->j_trans_id < trans_id) {
1359 		BUG_ON(other_jl->j_refcount <= 0);
1360 		/* do not flush all */
1361 		flush_journal_list(p_s_sb, other_jl, 0);
1362 
1363 		/* other_jl is now deleted from the list */
1364 		goto restart;
1365 	}
1366 	return 0;
1367 }
1368 
del_from_work_list(struct super_block * s,struct reiserfs_journal_list * jl)1369 static void del_from_work_list(struct super_block *s,
1370 			       struct reiserfs_journal_list *jl)
1371 {
1372 	struct reiserfs_journal *journal = SB_JOURNAL(s);
1373 	if (!list_empty(&jl->j_working_list)) {
1374 		list_del_init(&jl->j_working_list);
1375 		journal->j_num_work_lists--;
1376 	}
1377 }
1378 
1379 /* flush a journal list, both commit and real blocks
1380 **
1381 ** always set flushall to 1, unless you are calling from inside
1382 ** flush_journal_list
1383 **
1384 ** IMPORTANT.  This can only be called while there are no journal writers,
1385 ** and the journal is locked.  That means it can only be called from
1386 ** do_journal_end, or by journal_release
1387 */
flush_journal_list(struct super_block * s,struct reiserfs_journal_list * jl,int flushall)1388 static int flush_journal_list(struct super_block *s,
1389 			      struct reiserfs_journal_list *jl, int flushall)
1390 {
1391 	struct reiserfs_journal_list *pjl;
1392 	struct reiserfs_journal_cnode *cn, *last;
1393 	int count;
1394 	int was_jwait = 0;
1395 	int was_dirty = 0;
1396 	struct buffer_head *saved_bh;
1397 	unsigned long j_len_saved = jl->j_len;
1398 	struct reiserfs_journal *journal = SB_JOURNAL(s);
1399 	int err = 0;
1400 
1401 	BUG_ON(j_len_saved <= 0);
1402 
1403 	if (atomic_read(&journal->j_wcount) != 0) {
1404 		reiserfs_warning(s,
1405 				 "clm-2048: flush_journal_list called with wcount %d",
1406 				 atomic_read(&journal->j_wcount));
1407 	}
1408 	BUG_ON(jl->j_trans_id == 0);
1409 
1410 	/* if flushall == 0, the lock is already held */
1411 	if (flushall) {
1412 		mutex_lock(&journal->j_flush_mutex);
1413 	} else if (mutex_trylock(&journal->j_flush_mutex)) {
1414 		BUG();
1415 	}
1416 
1417 	count = 0;
1418 	if (j_len_saved > journal->j_trans_max) {
1419 		reiserfs_panic(s,
1420 			       "journal-715: flush_journal_list, length is %lu, trans id %lu\n",
1421 			       j_len_saved, jl->j_trans_id);
1422 		return 0;
1423 	}
1424 
1425 	get_fs_excl();
1426 
1427 	/* if all the work is already done, get out of here */
1428 	if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1429 	    atomic_read(&(jl->j_commit_left)) <= 0) {
1430 		goto flush_older_and_return;
1431 	}
1432 
1433 	/* start by putting the commit list on disk.  This will also flush
1434 	 ** the commit lists of any olders transactions
1435 	 */
1436 	flush_commit_list(s, jl, 1);
1437 
1438 	if (!(jl->j_state & LIST_DIRTY)
1439 	    && !reiserfs_is_journal_aborted(journal))
1440 		BUG();
1441 
1442 	/* are we done now? */
1443 	if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1444 	    atomic_read(&(jl->j_commit_left)) <= 0) {
1445 		goto flush_older_and_return;
1446 	}
1447 
1448 	/* loop through each cnode, see if we need to write it,
1449 	 ** or wait on a more recent transaction, or just ignore it
1450 	 */
1451 	if (atomic_read(&(journal->j_wcount)) != 0) {
1452 		reiserfs_panic(s,
1453 			       "journal-844: panic journal list is flushing, wcount is not 0\n");
1454 	}
1455 	cn = jl->j_realblock;
1456 	while (cn) {
1457 		was_jwait = 0;
1458 		was_dirty = 0;
1459 		saved_bh = NULL;
1460 		/* blocknr of 0 is no longer in the hash, ignore it */
1461 		if (cn->blocknr == 0) {
1462 			goto free_cnode;
1463 		}
1464 
1465 		/* This transaction failed commit. Don't write out to the disk */
1466 		if (!(jl->j_state & LIST_DIRTY))
1467 			goto free_cnode;
1468 
1469 		pjl = find_newer_jl_for_cn(cn);
1470 		/* the order is important here.  We check pjl to make sure we
1471 		 ** don't clear BH_JDirty_wait if we aren't the one writing this
1472 		 ** block to disk
1473 		 */
1474 		if (!pjl && cn->bh) {
1475 			saved_bh = cn->bh;
1476 
1477 			/* we do this to make sure nobody releases the buffer while
1478 			 ** we are working with it
1479 			 */
1480 			get_bh(saved_bh);
1481 
1482 			if (buffer_journal_dirty(saved_bh)) {
1483 				BUG_ON(!can_dirty(cn));
1484 				was_jwait = 1;
1485 				was_dirty = 1;
1486 			} else if (can_dirty(cn)) {
1487 				/* everything with !pjl && jwait should be writable */
1488 				BUG();
1489 			}
1490 		}
1491 
1492 		/* if someone has this block in a newer transaction, just make
1493 		 ** sure they are committed, and don't try writing it to disk
1494 		 */
1495 		if (pjl) {
1496 			if (atomic_read(&pjl->j_commit_left))
1497 				flush_commit_list(s, pjl, 1);
1498 			goto free_cnode;
1499 		}
1500 
1501 		/* bh == NULL when the block got to disk on its own, OR,
1502 		 ** the block got freed in a future transaction
1503 		 */
1504 		if (saved_bh == NULL) {
1505 			goto free_cnode;
1506 		}
1507 
1508 		/* this should never happen.  kupdate_one_transaction has this list
1509 		 ** locked while it works, so we should never see a buffer here that
1510 		 ** is not marked JDirty_wait
1511 		 */
1512 		if ((!was_jwait) && !buffer_locked(saved_bh)) {
1513 			reiserfs_warning(s,
1514 					 "journal-813: BAD! buffer %llu %cdirty %cjwait, "
1515 					 "not in a newer tranasction",
1516 					 (unsigned long long)saved_bh->
1517 					 b_blocknr, was_dirty ? ' ' : '!',
1518 					 was_jwait ? ' ' : '!');
1519 		}
1520 		if (was_dirty) {
1521 			/* we inc again because saved_bh gets decremented at free_cnode */
1522 			get_bh(saved_bh);
1523 			set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1524 			lock_buffer(saved_bh);
1525 			BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1526 			if (buffer_dirty(saved_bh))
1527 				submit_logged_buffer(saved_bh);
1528 			else
1529 				unlock_buffer(saved_bh);
1530 			count++;
1531 		} else {
1532 			reiserfs_warning(s,
1533 					 "clm-2082: Unable to flush buffer %llu in %s",
1534 					 (unsigned long long)saved_bh->
1535 					 b_blocknr, __func__);
1536 		}
1537 	      free_cnode:
1538 		last = cn;
1539 		cn = cn->next;
1540 		if (saved_bh) {
1541 			/* we incremented this to keep others from taking the buffer head away */
1542 			put_bh(saved_bh);
1543 			if (atomic_read(&(saved_bh->b_count)) < 0) {
1544 				reiserfs_warning(s,
1545 						 "journal-945: saved_bh->b_count < 0");
1546 			}
1547 		}
1548 	}
1549 	if (count > 0) {
1550 		cn = jl->j_realblock;
1551 		while (cn) {
1552 			if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1553 				if (!cn->bh) {
1554 					reiserfs_panic(s,
1555 						       "journal-1011: cn->bh is NULL\n");
1556 				}
1557 				wait_on_buffer(cn->bh);
1558 				if (!cn->bh) {
1559 					reiserfs_panic(s,
1560 						       "journal-1012: cn->bh is NULL\n");
1561 				}
1562 				if (unlikely(!buffer_uptodate(cn->bh))) {
1563 #ifdef CONFIG_REISERFS_CHECK
1564 					reiserfs_warning(s,
1565 							 "journal-949: buffer write failed\n");
1566 #endif
1567 					err = -EIO;
1568 				}
1569 				/* note, we must clear the JDirty_wait bit after the up to date
1570 				 ** check, otherwise we race against our flushpage routine
1571 				 */
1572 				BUG_ON(!test_clear_buffer_journal_dirty
1573 				       (cn->bh));
1574 
1575 				/* drop one ref for us */
1576 				put_bh(cn->bh);
1577 				/* drop one ref for journal_mark_dirty */
1578 				release_buffer_page(cn->bh);
1579 			}
1580 			cn = cn->next;
1581 		}
1582 	}
1583 
1584 	if (err)
1585 		reiserfs_abort(s, -EIO,
1586 			       "Write error while pushing transaction to disk in %s",
1587 			       __func__);
1588       flush_older_and_return:
1589 
1590 	/* before we can update the journal header block, we _must_ flush all
1591 	 ** real blocks from all older transactions to disk.  This is because
1592 	 ** once the header block is updated, this transaction will not be
1593 	 ** replayed after a crash
1594 	 */
1595 	if (flushall) {
1596 		flush_older_journal_lists(s, jl);
1597 	}
1598 
1599 	err = journal->j_errno;
1600 	/* before we can remove everything from the hash tables for this
1601 	 ** transaction, we must make sure it can never be replayed
1602 	 **
1603 	 ** since we are only called from do_journal_end, we know for sure there
1604 	 ** are no allocations going on while we are flushing journal lists.  So,
1605 	 ** we only need to update the journal header block for the last list
1606 	 ** being flushed
1607 	 */
1608 	if (!err && flushall) {
1609 		err =
1610 		    update_journal_header_block(s,
1611 						(jl->j_start + jl->j_len +
1612 						 2) % SB_ONDISK_JOURNAL_SIZE(s),
1613 						jl->j_trans_id);
1614 		if (err)
1615 			reiserfs_abort(s, -EIO,
1616 				       "Write error while updating journal header in %s",
1617 				       __func__);
1618 	}
1619 	remove_all_from_journal_list(s, jl, 0);
1620 	list_del_init(&jl->j_list);
1621 	journal->j_num_lists--;
1622 	del_from_work_list(s, jl);
1623 
1624 	if (journal->j_last_flush_id != 0 &&
1625 	    (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1626 		reiserfs_warning(s, "clm-2201: last flush %lu, current %lu",
1627 				 journal->j_last_flush_id, jl->j_trans_id);
1628 	}
1629 	journal->j_last_flush_id = jl->j_trans_id;
1630 
1631 	/* not strictly required since we are freeing the list, but it should
1632 	 * help find code using dead lists later on
1633 	 */
1634 	jl->j_len = 0;
1635 	atomic_set(&(jl->j_nonzerolen), 0);
1636 	jl->j_start = 0;
1637 	jl->j_realblock = NULL;
1638 	jl->j_commit_bh = NULL;
1639 	jl->j_trans_id = 0;
1640 	jl->j_state = 0;
1641 	put_journal_list(s, jl);
1642 	if (flushall)
1643 		mutex_unlock(&journal->j_flush_mutex);
1644 	put_fs_excl();
1645 	return err;
1646 }
1647 
test_transaction(struct super_block * s,struct reiserfs_journal_list * jl)1648 static int test_transaction(struct super_block *s,
1649                             struct reiserfs_journal_list *jl)
1650 {
1651 	struct reiserfs_journal_cnode *cn;
1652 
1653 	if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0)
1654 		return 1;
1655 
1656 	cn = jl->j_realblock;
1657 	while (cn) {
1658 		/* if the blocknr == 0, this has been cleared from the hash,
1659 		 ** skip it
1660 		 */
1661 		if (cn->blocknr == 0) {
1662 			goto next;
1663 		}
1664 		if (cn->bh && !newer_jl_done(cn))
1665 			return 0;
1666 	      next:
1667 		cn = cn->next;
1668 		cond_resched();
1669 	}
1670 	return 0;
1671 }
1672 
write_one_transaction(struct super_block * s,struct reiserfs_journal_list * jl,struct buffer_chunk * chunk)1673 static int write_one_transaction(struct super_block *s,
1674 				 struct reiserfs_journal_list *jl,
1675 				 struct buffer_chunk *chunk)
1676 {
1677 	struct reiserfs_journal_cnode *cn;
1678 	int ret = 0;
1679 
1680 	jl->j_state |= LIST_TOUCHED;
1681 	del_from_work_list(s, jl);
1682 	if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1683 		return 0;
1684 	}
1685 
1686 	cn = jl->j_realblock;
1687 	while (cn) {
1688 		/* if the blocknr == 0, this has been cleared from the hash,
1689 		 ** skip it
1690 		 */
1691 		if (cn->blocknr == 0) {
1692 			goto next;
1693 		}
1694 		if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1695 			struct buffer_head *tmp_bh;
1696 			/* we can race against journal_mark_freed when we try
1697 			 * to lock_buffer(cn->bh), so we have to inc the buffer
1698 			 * count, and recheck things after locking
1699 			 */
1700 			tmp_bh = cn->bh;
1701 			get_bh(tmp_bh);
1702 			lock_buffer(tmp_bh);
1703 			if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1704 				if (!buffer_journal_dirty(tmp_bh) ||
1705 				    buffer_journal_prepared(tmp_bh))
1706 					BUG();
1707 				add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1708 				ret++;
1709 			} else {
1710 				/* note, cn->bh might be null now */
1711 				unlock_buffer(tmp_bh);
1712 			}
1713 			put_bh(tmp_bh);
1714 		}
1715 	      next:
1716 		cn = cn->next;
1717 		cond_resched();
1718 	}
1719 	return ret;
1720 }
1721 
1722 /* used by flush_commit_list */
dirty_one_transaction(struct super_block * s,struct reiserfs_journal_list * jl)1723 static int dirty_one_transaction(struct super_block *s,
1724 				 struct reiserfs_journal_list *jl)
1725 {
1726 	struct reiserfs_journal_cnode *cn;
1727 	struct reiserfs_journal_list *pjl;
1728 	int ret = 0;
1729 
1730 	jl->j_state |= LIST_DIRTY;
1731 	cn = jl->j_realblock;
1732 	while (cn) {
1733 		/* look for a more recent transaction that logged this
1734 		 ** buffer.  Only the most recent transaction with a buffer in
1735 		 ** it is allowed to send that buffer to disk
1736 		 */
1737 		pjl = find_newer_jl_for_cn(cn);
1738 		if (!pjl && cn->blocknr && cn->bh
1739 		    && buffer_journal_dirty(cn->bh)) {
1740 			BUG_ON(!can_dirty(cn));
1741 			/* if the buffer is prepared, it will either be logged
1742 			 * or restored.  If restored, we need to make sure
1743 			 * it actually gets marked dirty
1744 			 */
1745 			clear_buffer_journal_new(cn->bh);
1746 			if (buffer_journal_prepared(cn->bh)) {
1747 				set_buffer_journal_restore_dirty(cn->bh);
1748 			} else {
1749 				set_buffer_journal_test(cn->bh);
1750 				mark_buffer_dirty(cn->bh);
1751 			}
1752 		}
1753 		cn = cn->next;
1754 	}
1755 	return ret;
1756 }
1757 
kupdate_transactions(struct super_block * s,struct reiserfs_journal_list * jl,struct reiserfs_journal_list ** next_jl,unsigned long * next_trans_id,int num_blocks,int num_trans)1758 static int kupdate_transactions(struct super_block *s,
1759 				struct reiserfs_journal_list *jl,
1760 				struct reiserfs_journal_list **next_jl,
1761 				unsigned long *next_trans_id,
1762 				int num_blocks, int num_trans)
1763 {
1764 	int ret = 0;
1765 	int written = 0;
1766 	int transactions_flushed = 0;
1767 	unsigned long orig_trans_id = jl->j_trans_id;
1768 	struct buffer_chunk chunk;
1769 	struct list_head *entry;
1770 	struct reiserfs_journal *journal = SB_JOURNAL(s);
1771 	chunk.nr = 0;
1772 
1773 	mutex_lock(&journal->j_flush_mutex);
1774 	if (!journal_list_still_alive(s, orig_trans_id)) {
1775 		goto done;
1776 	}
1777 
1778 	/* we've got j_flush_mutex held, nobody is going to delete any
1779 	 * of these lists out from underneath us
1780 	 */
1781 	while ((num_trans && transactions_flushed < num_trans) ||
1782 	       (!num_trans && written < num_blocks)) {
1783 
1784 		if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1785 		    atomic_read(&jl->j_commit_left)
1786 		    || !(jl->j_state & LIST_DIRTY)) {
1787 			del_from_work_list(s, jl);
1788 			break;
1789 		}
1790 		ret = write_one_transaction(s, jl, &chunk);
1791 
1792 		if (ret < 0)
1793 			goto done;
1794 		transactions_flushed++;
1795 		written += ret;
1796 		entry = jl->j_list.next;
1797 
1798 		/* did we wrap? */
1799 		if (entry == &journal->j_journal_list) {
1800 			break;
1801 		}
1802 		jl = JOURNAL_LIST_ENTRY(entry);
1803 
1804 		/* don't bother with older transactions */
1805 		if (jl->j_trans_id <= orig_trans_id)
1806 			break;
1807 	}
1808 	if (chunk.nr) {
1809 		write_chunk(&chunk);
1810 	}
1811 
1812       done:
1813 	mutex_unlock(&journal->j_flush_mutex);
1814 	return ret;
1815 }
1816 
1817 /* for o_sync and fsync heavy applications, they tend to use
1818 ** all the journa list slots with tiny transactions.  These
1819 ** trigger lots and lots of calls to update the header block, which
1820 ** adds seeks and slows things down.
1821 **
1822 ** This function tries to clear out a large chunk of the journal lists
1823 ** at once, which makes everything faster since only the newest journal
1824 ** list updates the header block
1825 */
flush_used_journal_lists(struct super_block * s,struct reiserfs_journal_list * jl)1826 static int flush_used_journal_lists(struct super_block *s,
1827 				    struct reiserfs_journal_list *jl)
1828 {
1829 	unsigned long len = 0;
1830 	unsigned long cur_len;
1831 	int ret;
1832 	int i;
1833 	int limit = 256;
1834 	struct reiserfs_journal_list *tjl;
1835 	struct reiserfs_journal_list *flush_jl;
1836 	unsigned long trans_id;
1837 	struct reiserfs_journal *journal = SB_JOURNAL(s);
1838 
1839 	flush_jl = tjl = jl;
1840 
1841 	/* in data logging mode, try harder to flush a lot of blocks */
1842 	if (reiserfs_data_log(s))
1843 		limit = 1024;
1844 	/* flush for 256 transactions or limit blocks, whichever comes first */
1845 	for (i = 0; i < 256 && len < limit; i++) {
1846 		if (atomic_read(&tjl->j_commit_left) ||
1847 		    tjl->j_trans_id < jl->j_trans_id) {
1848 			break;
1849 		}
1850 		cur_len = atomic_read(&tjl->j_nonzerolen);
1851 		if (cur_len > 0) {
1852 			tjl->j_state &= ~LIST_TOUCHED;
1853 		}
1854 		len += cur_len;
1855 		flush_jl = tjl;
1856 		if (tjl->j_list.next == &journal->j_journal_list)
1857 			break;
1858 		tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1859 	}
1860 	/* try to find a group of blocks we can flush across all the
1861 	 ** transactions, but only bother if we've actually spanned
1862 	 ** across multiple lists
1863 	 */
1864 	if (flush_jl != jl) {
1865 		ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1866 	}
1867 	flush_journal_list(s, flush_jl, 1);
1868 	return 0;
1869 }
1870 
1871 /*
1872 ** removes any nodes in table with name block and dev as bh.
1873 ** only touchs the hnext and hprev pointers.
1874 */
remove_journal_hash(struct super_block * sb,struct reiserfs_journal_cnode ** table,struct reiserfs_journal_list * jl,unsigned long block,int remove_freed)1875 void remove_journal_hash(struct super_block *sb,
1876 			 struct reiserfs_journal_cnode **table,
1877 			 struct reiserfs_journal_list *jl,
1878 			 unsigned long block, int remove_freed)
1879 {
1880 	struct reiserfs_journal_cnode *cur;
1881 	struct reiserfs_journal_cnode **head;
1882 
1883 	head = &(journal_hash(table, sb, block));
1884 	if (!head) {
1885 		return;
1886 	}
1887 	cur = *head;
1888 	while (cur) {
1889 		if (cur->blocknr == block && cur->sb == sb
1890 		    && (jl == NULL || jl == cur->jlist)
1891 		    && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1892 			if (cur->hnext) {
1893 				cur->hnext->hprev = cur->hprev;
1894 			}
1895 			if (cur->hprev) {
1896 				cur->hprev->hnext = cur->hnext;
1897 			} else {
1898 				*head = cur->hnext;
1899 			}
1900 			cur->blocknr = 0;
1901 			cur->sb = NULL;
1902 			cur->state = 0;
1903 			if (cur->bh && cur->jlist)	/* anybody who clears the cur->bh will also dec the nonzerolen */
1904 				atomic_dec(&(cur->jlist->j_nonzerolen));
1905 			cur->bh = NULL;
1906 			cur->jlist = NULL;
1907 		}
1908 		cur = cur->hnext;
1909 	}
1910 }
1911 
free_journal_ram(struct super_block * p_s_sb)1912 static void free_journal_ram(struct super_block *p_s_sb)
1913 {
1914 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
1915 	kfree(journal->j_current_jl);
1916 	journal->j_num_lists--;
1917 
1918 	vfree(journal->j_cnode_free_orig);
1919 	free_list_bitmaps(p_s_sb, journal->j_list_bitmap);
1920 	free_bitmap_nodes(p_s_sb);	/* must be after free_list_bitmaps */
1921 	if (journal->j_header_bh) {
1922 		brelse(journal->j_header_bh);
1923 	}
1924 	/* j_header_bh is on the journal dev, make sure not to release the journal
1925 	 * dev until we brelse j_header_bh
1926 	 */
1927 	release_journal_dev(p_s_sb, journal);
1928 	vfree(journal);
1929 }
1930 
1931 /*
1932 ** call on unmount.  Only set error to 1 if you haven't made your way out
1933 ** of read_super() yet.  Any other caller must keep error at 0.
1934 */
do_journal_release(struct reiserfs_transaction_handle * th,struct super_block * p_s_sb,int error)1935 static int do_journal_release(struct reiserfs_transaction_handle *th,
1936 			      struct super_block *p_s_sb, int error)
1937 {
1938 	struct reiserfs_transaction_handle myth;
1939 	int flushed = 0;
1940 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
1941 
1942 	/* we only want to flush out transactions if we were called with error == 0
1943 	 */
1944 	if (!error && !(p_s_sb->s_flags & MS_RDONLY)) {
1945 		/* end the current trans */
1946 		BUG_ON(!th->t_trans_id);
1947 		do_journal_end(th, p_s_sb, 10, FLUSH_ALL);
1948 
1949 		/* make sure something gets logged to force our way into the flush code */
1950 		if (!journal_join(&myth, p_s_sb, 1)) {
1951 			reiserfs_prepare_for_journal(p_s_sb,
1952 						     SB_BUFFER_WITH_SB(p_s_sb),
1953 						     1);
1954 			journal_mark_dirty(&myth, p_s_sb,
1955 					   SB_BUFFER_WITH_SB(p_s_sb));
1956 			do_journal_end(&myth, p_s_sb, 1, FLUSH_ALL);
1957 			flushed = 1;
1958 		}
1959 	}
1960 
1961 	/* this also catches errors during the do_journal_end above */
1962 	if (!error && reiserfs_is_journal_aborted(journal)) {
1963 		memset(&myth, 0, sizeof(myth));
1964 		if (!journal_join_abort(&myth, p_s_sb, 1)) {
1965 			reiserfs_prepare_for_journal(p_s_sb,
1966 						     SB_BUFFER_WITH_SB(p_s_sb),
1967 						     1);
1968 			journal_mark_dirty(&myth, p_s_sb,
1969 					   SB_BUFFER_WITH_SB(p_s_sb));
1970 			do_journal_end(&myth, p_s_sb, 1, FLUSH_ALL);
1971 		}
1972 	}
1973 
1974 	reiserfs_mounted_fs_count--;
1975 	/* wait for all commits to finish */
1976 	cancel_delayed_work(&SB_JOURNAL(p_s_sb)->j_work);
1977 	flush_workqueue(commit_wq);
1978 	if (!reiserfs_mounted_fs_count) {
1979 		destroy_workqueue(commit_wq);
1980 		commit_wq = NULL;
1981 	}
1982 
1983 	free_journal_ram(p_s_sb);
1984 
1985 	return 0;
1986 }
1987 
1988 /*
1989 ** call on unmount.  flush all journal trans, release all alloc'd ram
1990 */
journal_release(struct reiserfs_transaction_handle * th,struct super_block * p_s_sb)1991 int journal_release(struct reiserfs_transaction_handle *th,
1992 		    struct super_block *p_s_sb)
1993 {
1994 	return do_journal_release(th, p_s_sb, 0);
1995 }
1996 
1997 /*
1998 ** only call from an error condition inside reiserfs_read_super!
1999 */
journal_release_error(struct reiserfs_transaction_handle * th,struct super_block * p_s_sb)2000 int journal_release_error(struct reiserfs_transaction_handle *th,
2001 			  struct super_block *p_s_sb)
2002 {
2003 	return do_journal_release(th, p_s_sb, 1);
2004 }
2005 
2006 /* compares description block with commit block.  returns 1 if they differ, 0 if they are the same */
journal_compare_desc_commit(struct super_block * p_s_sb,struct reiserfs_journal_desc * desc,struct reiserfs_journal_commit * commit)2007 static int journal_compare_desc_commit(struct super_block *p_s_sb,
2008 				       struct reiserfs_journal_desc *desc,
2009 				       struct reiserfs_journal_commit *commit)
2010 {
2011 	if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
2012 	    get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
2013 	    get_commit_trans_len(commit) > SB_JOURNAL(p_s_sb)->j_trans_max ||
2014 	    get_commit_trans_len(commit) <= 0) {
2015 		return 1;
2016 	}
2017 	return 0;
2018 }
2019 
2020 /* returns 0 if it did not find a description block
2021 ** returns -1 if it found a corrupt commit block
2022 ** returns 1 if both desc and commit were valid
2023 */
journal_transaction_is_valid(struct super_block * p_s_sb,struct buffer_head * d_bh,unsigned long * oldest_invalid_trans_id,unsigned long * newest_mount_id)2024 static int journal_transaction_is_valid(struct super_block *p_s_sb,
2025 					struct buffer_head *d_bh,
2026 					unsigned long *oldest_invalid_trans_id,
2027 					unsigned long *newest_mount_id)
2028 {
2029 	struct reiserfs_journal_desc *desc;
2030 	struct reiserfs_journal_commit *commit;
2031 	struct buffer_head *c_bh;
2032 	unsigned long offset;
2033 
2034 	if (!d_bh)
2035 		return 0;
2036 
2037 	desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2038 	if (get_desc_trans_len(desc) > 0
2039 	    && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2040 		if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2041 		    && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2042 			reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2043 				       "journal-986: transaction "
2044 				       "is valid returning because trans_id %d is greater than "
2045 				       "oldest_invalid %lu",
2046 				       get_desc_trans_id(desc),
2047 				       *oldest_invalid_trans_id);
2048 			return 0;
2049 		}
2050 		if (newest_mount_id
2051 		    && *newest_mount_id > get_desc_mount_id(desc)) {
2052 			reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2053 				       "journal-1087: transaction "
2054 				       "is valid returning because mount_id %d is less than "
2055 				       "newest_mount_id %lu",
2056 				       get_desc_mount_id(desc),
2057 				       *newest_mount_id);
2058 			return -1;
2059 		}
2060 		if (get_desc_trans_len(desc) > SB_JOURNAL(p_s_sb)->j_trans_max) {
2061 			reiserfs_warning(p_s_sb,
2062 					 "journal-2018: Bad transaction length %d encountered, ignoring transaction",
2063 					 get_desc_trans_len(desc));
2064 			return -1;
2065 		}
2066 		offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
2067 
2068 		/* ok, we have a journal description block, lets see if the transaction was valid */
2069 		c_bh =
2070 		    journal_bread(p_s_sb,
2071 				  SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2072 				  ((offset + get_desc_trans_len(desc) +
2073 				    1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
2074 		if (!c_bh)
2075 			return 0;
2076 		commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2077 		if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
2078 			reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2079 				       "journal_transaction_is_valid, commit offset %ld had bad "
2080 				       "time %d or length %d",
2081 				       c_bh->b_blocknr -
2082 				       SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2083 				       get_commit_trans_id(commit),
2084 				       get_commit_trans_len(commit));
2085 			brelse(c_bh);
2086 			if (oldest_invalid_trans_id) {
2087 				*oldest_invalid_trans_id =
2088 				    get_desc_trans_id(desc);
2089 				reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2090 					       "journal-1004: "
2091 					       "transaction_is_valid setting oldest invalid trans_id "
2092 					       "to %d",
2093 					       get_desc_trans_id(desc));
2094 			}
2095 			return -1;
2096 		}
2097 		brelse(c_bh);
2098 		reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2099 			       "journal-1006: found valid "
2100 			       "transaction start offset %llu, len %d id %d",
2101 			       d_bh->b_blocknr -
2102 			       SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2103 			       get_desc_trans_len(desc),
2104 			       get_desc_trans_id(desc));
2105 		return 1;
2106 	} else {
2107 		return 0;
2108 	}
2109 }
2110 
brelse_array(struct buffer_head ** heads,int num)2111 static void brelse_array(struct buffer_head **heads, int num)
2112 {
2113 	int i;
2114 	for (i = 0; i < num; i++) {
2115 		brelse(heads[i]);
2116 	}
2117 }
2118 
2119 /*
2120 ** given the start, and values for the oldest acceptable transactions,
2121 ** this either reads in a replays a transaction, or returns because the transaction
2122 ** is invalid, or too old.
2123 */
journal_read_transaction(struct super_block * p_s_sb,unsigned long cur_dblock,unsigned long oldest_start,unsigned long oldest_trans_id,unsigned long newest_mount_id)2124 static int journal_read_transaction(struct super_block *p_s_sb,
2125 				    unsigned long cur_dblock,
2126 				    unsigned long oldest_start,
2127 				    unsigned long oldest_trans_id,
2128 				    unsigned long newest_mount_id)
2129 {
2130 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
2131 	struct reiserfs_journal_desc *desc;
2132 	struct reiserfs_journal_commit *commit;
2133 	unsigned long trans_id = 0;
2134 	struct buffer_head *c_bh;
2135 	struct buffer_head *d_bh;
2136 	struct buffer_head **log_blocks = NULL;
2137 	struct buffer_head **real_blocks = NULL;
2138 	unsigned long trans_offset;
2139 	int i;
2140 	int trans_half;
2141 
2142 	d_bh = journal_bread(p_s_sb, cur_dblock);
2143 	if (!d_bh)
2144 		return 1;
2145 	desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2146 	trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
2147 	reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1037: "
2148 		       "journal_read_transaction, offset %llu, len %d mount_id %d",
2149 		       d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2150 		       get_desc_trans_len(desc), get_desc_mount_id(desc));
2151 	if (get_desc_trans_id(desc) < oldest_trans_id) {
2152 		reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1039: "
2153 			       "journal_read_trans skipping because %lu is too old",
2154 			       cur_dblock -
2155 			       SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb));
2156 		brelse(d_bh);
2157 		return 1;
2158 	}
2159 	if (get_desc_mount_id(desc) != newest_mount_id) {
2160 		reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1146: "
2161 			       "journal_read_trans skipping because %d is != "
2162 			       "newest_mount_id %lu", get_desc_mount_id(desc),
2163 			       newest_mount_id);
2164 		brelse(d_bh);
2165 		return 1;
2166 	}
2167 	c_bh = journal_bread(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2168 			     ((trans_offset + get_desc_trans_len(desc) + 1) %
2169 			      SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
2170 	if (!c_bh) {
2171 		brelse(d_bh);
2172 		return 1;
2173 	}
2174 	commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2175 	if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
2176 		reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2177 			       "journal_read_transaction, "
2178 			       "commit offset %llu had bad time %d or length %d",
2179 			       c_bh->b_blocknr -
2180 			       SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2181 			       get_commit_trans_id(commit),
2182 			       get_commit_trans_len(commit));
2183 		brelse(c_bh);
2184 		brelse(d_bh);
2185 		return 1;
2186 	}
2187 	trans_id = get_desc_trans_id(desc);
2188 	/* now we know we've got a good transaction, and it was inside the valid time ranges */
2189 	log_blocks = kmalloc(get_desc_trans_len(desc) *
2190 			     sizeof(struct buffer_head *), GFP_NOFS);
2191 	real_blocks = kmalloc(get_desc_trans_len(desc) *
2192 			      sizeof(struct buffer_head *), GFP_NOFS);
2193 	if (!log_blocks || !real_blocks) {
2194 		brelse(c_bh);
2195 		brelse(d_bh);
2196 		kfree(log_blocks);
2197 		kfree(real_blocks);
2198 		reiserfs_warning(p_s_sb,
2199 				 "journal-1169: kmalloc failed, unable to mount FS");
2200 		return -1;
2201 	}
2202 	/* get all the buffer heads */
2203 	trans_half = journal_trans_half(p_s_sb->s_blocksize);
2204 	for (i = 0; i < get_desc_trans_len(desc); i++) {
2205 		log_blocks[i] =
2206 		    journal_getblk(p_s_sb,
2207 				   SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2208 				   (trans_offset + 1 +
2209 				    i) % SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2210 		if (i < trans_half) {
2211 			real_blocks[i] =
2212 			    sb_getblk(p_s_sb,
2213 				      le32_to_cpu(desc->j_realblock[i]));
2214 		} else {
2215 			real_blocks[i] =
2216 			    sb_getblk(p_s_sb,
2217 				      le32_to_cpu(commit->
2218 						  j_realblock[i - trans_half]));
2219 		}
2220 		if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(p_s_sb)) {
2221 			reiserfs_warning(p_s_sb,
2222 					 "journal-1207: REPLAY FAILURE fsck required! Block to replay is outside of filesystem");
2223 			goto abort_replay;
2224 		}
2225 		/* make sure we don't try to replay onto log or reserved area */
2226 		if (is_block_in_log_or_reserved_area
2227 		    (p_s_sb, real_blocks[i]->b_blocknr)) {
2228 			reiserfs_warning(p_s_sb,
2229 					 "journal-1204: REPLAY FAILURE fsck required! Trying to replay onto a log block");
2230 		      abort_replay:
2231 			brelse_array(log_blocks, i);
2232 			brelse_array(real_blocks, i);
2233 			brelse(c_bh);
2234 			brelse(d_bh);
2235 			kfree(log_blocks);
2236 			kfree(real_blocks);
2237 			return -1;
2238 		}
2239 	}
2240 	/* read in the log blocks, memcpy to the corresponding real block */
2241 	ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
2242 	for (i = 0; i < get_desc_trans_len(desc); i++) {
2243 		wait_on_buffer(log_blocks[i]);
2244 		if (!buffer_uptodate(log_blocks[i])) {
2245 			reiserfs_warning(p_s_sb,
2246 					 "journal-1212: REPLAY FAILURE fsck required! buffer write failed");
2247 			brelse_array(log_blocks + i,
2248 				     get_desc_trans_len(desc) - i);
2249 			brelse_array(real_blocks, get_desc_trans_len(desc));
2250 			brelse(c_bh);
2251 			brelse(d_bh);
2252 			kfree(log_blocks);
2253 			kfree(real_blocks);
2254 			return -1;
2255 		}
2256 		memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2257 		       real_blocks[i]->b_size);
2258 		set_buffer_uptodate(real_blocks[i]);
2259 		brelse(log_blocks[i]);
2260 	}
2261 	/* flush out the real blocks */
2262 	for (i = 0; i < get_desc_trans_len(desc); i++) {
2263 		set_buffer_dirty(real_blocks[i]);
2264 		ll_rw_block(SWRITE, 1, real_blocks + i);
2265 	}
2266 	for (i = 0; i < get_desc_trans_len(desc); i++) {
2267 		wait_on_buffer(real_blocks[i]);
2268 		if (!buffer_uptodate(real_blocks[i])) {
2269 			reiserfs_warning(p_s_sb,
2270 					 "journal-1226: REPLAY FAILURE, fsck required! buffer write failed");
2271 			brelse_array(real_blocks + i,
2272 				     get_desc_trans_len(desc) - i);
2273 			brelse(c_bh);
2274 			brelse(d_bh);
2275 			kfree(log_blocks);
2276 			kfree(real_blocks);
2277 			return -1;
2278 		}
2279 		brelse(real_blocks[i]);
2280 	}
2281 	cur_dblock =
2282 	    SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2283 	    ((trans_offset + get_desc_trans_len(desc) +
2284 	      2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2285 	reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2286 		       "journal-1095: setting journal " "start to offset %ld",
2287 		       cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb));
2288 
2289 	/* init starting values for the first transaction, in case this is the last transaction to be replayed. */
2290 	journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
2291 	journal->j_last_flush_trans_id = trans_id;
2292 	journal->j_trans_id = trans_id + 1;
2293 	/* check for trans_id overflow */
2294 	if (journal->j_trans_id == 0)
2295 		journal->j_trans_id = 10;
2296 	brelse(c_bh);
2297 	brelse(d_bh);
2298 	kfree(log_blocks);
2299 	kfree(real_blocks);
2300 	return 0;
2301 }
2302 
2303 /* This function reads blocks starting from block and to max_block of bufsize
2304    size (but no more than BUFNR blocks at a time). This proved to improve
2305    mounting speed on self-rebuilding raid5 arrays at least.
2306    Right now it is only used from journal code. But later we might use it
2307    from other places.
2308    Note: Do not use journal_getblk/sb_getblk functions here! */
reiserfs_breada(struct block_device * dev,b_blocknr_t block,int bufsize,b_blocknr_t max_block)2309 static struct buffer_head *reiserfs_breada(struct block_device *dev,
2310 					   b_blocknr_t block, int bufsize,
2311 					   b_blocknr_t max_block)
2312 {
2313 	struct buffer_head *bhlist[BUFNR];
2314 	unsigned int blocks = BUFNR;
2315 	struct buffer_head *bh;
2316 	int i, j;
2317 
2318 	bh = __getblk(dev, block, bufsize);
2319 	if (buffer_uptodate(bh))
2320 		return (bh);
2321 
2322 	if (block + BUFNR > max_block) {
2323 		blocks = max_block - block;
2324 	}
2325 	bhlist[0] = bh;
2326 	j = 1;
2327 	for (i = 1; i < blocks; i++) {
2328 		bh = __getblk(dev, block + i, bufsize);
2329 		if (buffer_uptodate(bh)) {
2330 			brelse(bh);
2331 			break;
2332 		} else
2333 			bhlist[j++] = bh;
2334 	}
2335 	ll_rw_block(READ, j, bhlist);
2336 	for (i = 1; i < j; i++)
2337 		brelse(bhlist[i]);
2338 	bh = bhlist[0];
2339 	wait_on_buffer(bh);
2340 	if (buffer_uptodate(bh))
2341 		return bh;
2342 	brelse(bh);
2343 	return NULL;
2344 }
2345 
2346 /*
2347 ** read and replay the log
2348 ** on a clean unmount, the journal header's next unflushed pointer will be to an invalid
2349 ** transaction.  This tests that before finding all the transactions in the log, which makes normal mount times fast.
2350 **
2351 ** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid.
2352 **
2353 ** On exit, it sets things up so the first transaction will work correctly.
2354 */
journal_read(struct super_block * p_s_sb)2355 static int journal_read(struct super_block *p_s_sb)
2356 {
2357 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
2358 	struct reiserfs_journal_desc *desc;
2359 	unsigned long oldest_trans_id = 0;
2360 	unsigned long oldest_invalid_trans_id = 0;
2361 	time_t start;
2362 	unsigned long oldest_start = 0;
2363 	unsigned long cur_dblock = 0;
2364 	unsigned long newest_mount_id = 9;
2365 	struct buffer_head *d_bh;
2366 	struct reiserfs_journal_header *jh;
2367 	int valid_journal_header = 0;
2368 	int replay_count = 0;
2369 	int continue_replay = 1;
2370 	int ret;
2371 	char b[BDEVNAME_SIZE];
2372 
2373 	cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
2374 	reiserfs_info(p_s_sb, "checking transaction log (%s)\n",
2375 		      bdevname(journal->j_dev_bd, b));
2376 	start = get_seconds();
2377 
2378 	/* step 1, read in the journal header block.  Check the transaction it says
2379 	 ** is the first unflushed, and if that transaction is not valid,
2380 	 ** replay is done
2381 	 */
2382 	journal->j_header_bh = journal_bread(p_s_sb,
2383 					     SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb)
2384 					     + SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2385 	if (!journal->j_header_bh) {
2386 		return 1;
2387 	}
2388 	jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2389 	if (le32_to_cpu(jh->j_first_unflushed_offset) <
2390 	    SB_ONDISK_JOURNAL_SIZE(p_s_sb)
2391 	    && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2392 		oldest_start =
2393 		    SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2394 		    le32_to_cpu(jh->j_first_unflushed_offset);
2395 		oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2396 		newest_mount_id = le32_to_cpu(jh->j_mount_id);
2397 		reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2398 			       "journal-1153: found in "
2399 			       "header: first_unflushed_offset %d, last_flushed_trans_id "
2400 			       "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2401 			       le32_to_cpu(jh->j_last_flush_trans_id));
2402 		valid_journal_header = 1;
2403 
2404 		/* now, we try to read the first unflushed offset.  If it is not valid,
2405 		 ** there is nothing more we can do, and it makes no sense to read
2406 		 ** through the whole log.
2407 		 */
2408 		d_bh =
2409 		    journal_bread(p_s_sb,
2410 				  SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2411 				  le32_to_cpu(jh->j_first_unflushed_offset));
2412 		ret = journal_transaction_is_valid(p_s_sb, d_bh, NULL, NULL);
2413 		if (!ret) {
2414 			continue_replay = 0;
2415 		}
2416 		brelse(d_bh);
2417 		goto start_log_replay;
2418 	}
2419 
2420 	if (continue_replay && bdev_read_only(p_s_sb->s_bdev)) {
2421 		reiserfs_warning(p_s_sb,
2422 				 "clm-2076: device is readonly, unable to replay log");
2423 		return -1;
2424 	}
2425 
2426 	/* ok, there are transactions that need to be replayed.  start with the first log block, find
2427 	 ** all the valid transactions, and pick out the oldest.
2428 	 */
2429 	while (continue_replay
2430 	       && cur_dblock <
2431 	       (SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2432 		SB_ONDISK_JOURNAL_SIZE(p_s_sb))) {
2433 		/* Note that it is required for blocksize of primary fs device and journal
2434 		   device to be the same */
2435 		d_bh =
2436 		    reiserfs_breada(journal->j_dev_bd, cur_dblock,
2437 				    p_s_sb->s_blocksize,
2438 				    SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2439 				    SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2440 		ret =
2441 		    journal_transaction_is_valid(p_s_sb, d_bh,
2442 						 &oldest_invalid_trans_id,
2443 						 &newest_mount_id);
2444 		if (ret == 1) {
2445 			desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2446 			if (oldest_start == 0) {	/* init all oldest_ values */
2447 				oldest_trans_id = get_desc_trans_id(desc);
2448 				oldest_start = d_bh->b_blocknr;
2449 				newest_mount_id = get_desc_mount_id(desc);
2450 				reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2451 					       "journal-1179: Setting "
2452 					       "oldest_start to offset %llu, trans_id %lu",
2453 					       oldest_start -
2454 					       SB_ONDISK_JOURNAL_1st_BLOCK
2455 					       (p_s_sb), oldest_trans_id);
2456 			} else if (oldest_trans_id > get_desc_trans_id(desc)) {
2457 				/* one we just read was older */
2458 				oldest_trans_id = get_desc_trans_id(desc);
2459 				oldest_start = d_bh->b_blocknr;
2460 				reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2461 					       "journal-1180: Resetting "
2462 					       "oldest_start to offset %lu, trans_id %lu",
2463 					       oldest_start -
2464 					       SB_ONDISK_JOURNAL_1st_BLOCK
2465 					       (p_s_sb), oldest_trans_id);
2466 			}
2467 			if (newest_mount_id < get_desc_mount_id(desc)) {
2468 				newest_mount_id = get_desc_mount_id(desc);
2469 				reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2470 					       "journal-1299: Setting "
2471 					       "newest_mount_id to %d",
2472 					       get_desc_mount_id(desc));
2473 			}
2474 			cur_dblock += get_desc_trans_len(desc) + 2;
2475 		} else {
2476 			cur_dblock++;
2477 		}
2478 		brelse(d_bh);
2479 	}
2480 
2481       start_log_replay:
2482 	cur_dblock = oldest_start;
2483 	if (oldest_trans_id) {
2484 		reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2485 			       "journal-1206: Starting replay "
2486 			       "from offset %llu, trans_id %lu",
2487 			       cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2488 			       oldest_trans_id);
2489 
2490 	}
2491 	replay_count = 0;
2492 	while (continue_replay && oldest_trans_id > 0) {
2493 		ret =
2494 		    journal_read_transaction(p_s_sb, cur_dblock, oldest_start,
2495 					     oldest_trans_id, newest_mount_id);
2496 		if (ret < 0) {
2497 			return ret;
2498 		} else if (ret != 0) {
2499 			break;
2500 		}
2501 		cur_dblock =
2502 		    SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + journal->j_start;
2503 		replay_count++;
2504 		if (cur_dblock == oldest_start)
2505 			break;
2506 	}
2507 
2508 	if (oldest_trans_id == 0) {
2509 		reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2510 			       "journal-1225: No valid " "transactions found");
2511 	}
2512 	/* j_start does not get set correctly if we don't replay any transactions.
2513 	 ** if we had a valid journal_header, set j_start to the first unflushed transaction value,
2514 	 ** copy the trans_id from the header
2515 	 */
2516 	if (valid_journal_header && replay_count == 0) {
2517 		journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2518 		journal->j_trans_id =
2519 		    le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2520 		/* check for trans_id overflow */
2521 		if (journal->j_trans_id == 0)
2522 			journal->j_trans_id = 10;
2523 		journal->j_last_flush_trans_id =
2524 		    le32_to_cpu(jh->j_last_flush_trans_id);
2525 		journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2526 	} else {
2527 		journal->j_mount_id = newest_mount_id + 1;
2528 	}
2529 	reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2530 		       "newest_mount_id to %lu", journal->j_mount_id);
2531 	journal->j_first_unflushed_offset = journal->j_start;
2532 	if (replay_count > 0) {
2533 		reiserfs_info(p_s_sb,
2534 			      "replayed %d transactions in %lu seconds\n",
2535 			      replay_count, get_seconds() - start);
2536 	}
2537 	if (!bdev_read_only(p_s_sb->s_bdev) &&
2538 	    _update_journal_header_block(p_s_sb, journal->j_start,
2539 					 journal->j_last_flush_trans_id)) {
2540 		/* replay failed, caller must call free_journal_ram and abort
2541 		 ** the mount
2542 		 */
2543 		return -1;
2544 	}
2545 	return 0;
2546 }
2547 
alloc_journal_list(struct super_block * s)2548 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2549 {
2550 	struct reiserfs_journal_list *jl;
2551 	jl = kzalloc(sizeof(struct reiserfs_journal_list),
2552 		     GFP_NOFS | __GFP_NOFAIL);
2553 	INIT_LIST_HEAD(&jl->j_list);
2554 	INIT_LIST_HEAD(&jl->j_working_list);
2555 	INIT_LIST_HEAD(&jl->j_tail_bh_list);
2556 	INIT_LIST_HEAD(&jl->j_bh_list);
2557 	mutex_init(&jl->j_commit_mutex);
2558 	SB_JOURNAL(s)->j_num_lists++;
2559 	get_journal_list(jl);
2560 	return jl;
2561 }
2562 
journal_list_init(struct super_block * p_s_sb)2563 static void journal_list_init(struct super_block *p_s_sb)
2564 {
2565 	SB_JOURNAL(p_s_sb)->j_current_jl = alloc_journal_list(p_s_sb);
2566 }
2567 
release_journal_dev(struct super_block * super,struct reiserfs_journal * journal)2568 static int release_journal_dev(struct super_block *super,
2569 			       struct reiserfs_journal *journal)
2570 {
2571 	int result;
2572 
2573 	result = 0;
2574 
2575 	if (journal->j_dev_bd != NULL) {
2576 		if (journal->j_dev_bd->bd_dev != super->s_dev)
2577 			bd_release(journal->j_dev_bd);
2578 		result = blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2579 		journal->j_dev_bd = NULL;
2580 	}
2581 
2582 	if (result != 0) {
2583 		reiserfs_warning(super,
2584 				 "sh-457: release_journal_dev: Cannot release journal device: %i",
2585 				 result);
2586 	}
2587 	return result;
2588 }
2589 
journal_init_dev(struct super_block * super,struct reiserfs_journal * journal,const char * jdev_name)2590 static int journal_init_dev(struct super_block *super,
2591 			    struct reiserfs_journal *journal,
2592 			    const char *jdev_name)
2593 {
2594 	int result;
2595 	dev_t jdev;
2596 	fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE;
2597 	char b[BDEVNAME_SIZE];
2598 
2599 	result = 0;
2600 
2601 	journal->j_dev_bd = NULL;
2602 	jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2603 	    new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2604 
2605 	if (bdev_read_only(super->s_bdev))
2606 		blkdev_mode = FMODE_READ;
2607 
2608 	/* there is no "jdev" option and journal is on separate device */
2609 	if ((!jdev_name || !jdev_name[0])) {
2610 		journal->j_dev_bd = open_by_devnum(jdev, blkdev_mode);
2611 		journal->j_dev_mode = blkdev_mode;
2612 		if (IS_ERR(journal->j_dev_bd)) {
2613 			result = PTR_ERR(journal->j_dev_bd);
2614 			journal->j_dev_bd = NULL;
2615 			reiserfs_warning(super, "sh-458: journal_init_dev: "
2616 					 "cannot init journal device '%s': %i",
2617 					 __bdevname(jdev, b), result);
2618 			return result;
2619 		} else if (jdev != super->s_dev) {
2620 			result = bd_claim(journal->j_dev_bd, journal);
2621 			if (result) {
2622 				blkdev_put(journal->j_dev_bd, blkdev_mode);
2623 				return result;
2624 			}
2625 
2626 			set_blocksize(journal->j_dev_bd, super->s_blocksize);
2627 		}
2628 
2629 		return 0;
2630 	}
2631 
2632 	journal->j_dev_mode = blkdev_mode;
2633 	journal->j_dev_bd = open_bdev_exclusive(jdev_name,
2634 						blkdev_mode, journal);
2635 	if (IS_ERR(journal->j_dev_bd)) {
2636 		result = PTR_ERR(journal->j_dev_bd);
2637 		journal->j_dev_bd = NULL;
2638 		reiserfs_warning(super,
2639 				 "journal_init_dev: Cannot open '%s': %i",
2640 				 jdev_name, result);
2641 		return result;
2642 	}
2643 
2644 	set_blocksize(journal->j_dev_bd, super->s_blocksize);
2645 	reiserfs_info(super,
2646 		      "journal_init_dev: journal device: %s\n",
2647 		      bdevname(journal->j_dev_bd, b));
2648 	return 0;
2649 }
2650 
2651 /**
2652  * When creating/tuning a file system user can assign some
2653  * journal params within boundaries which depend on the ratio
2654  * blocksize/standard_blocksize.
2655  *
2656  * For blocks >= standard_blocksize transaction size should
2657  * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2658  * then JOURNAL_TRANS_MAX_DEFAULT.
2659  *
2660  * For blocks < standard_blocksize these boundaries should be
2661  * decreased proportionally.
2662  */
2663 #define REISERFS_STANDARD_BLKSIZE (4096)
2664 
check_advise_trans_params(struct super_block * p_s_sb,struct reiserfs_journal * journal)2665 static int check_advise_trans_params(struct super_block *p_s_sb,
2666 				     struct reiserfs_journal *journal)
2667 {
2668         if (journal->j_trans_max) {
2669 	        /* Non-default journal params.
2670 		   Do sanity check for them. */
2671 	        int ratio = 1;
2672 		if (p_s_sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2673 		        ratio = REISERFS_STANDARD_BLKSIZE / p_s_sb->s_blocksize;
2674 
2675 		if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2676 		    journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2677 		    SB_ONDISK_JOURNAL_SIZE(p_s_sb) / journal->j_trans_max <
2678 		    JOURNAL_MIN_RATIO) {
2679 		        reiserfs_warning(p_s_sb,
2680 				 "sh-462: bad transaction max size (%u). FSCK?",
2681 				 journal->j_trans_max);
2682 			return 1;
2683 		}
2684 		if (journal->j_max_batch != (journal->j_trans_max) *
2685 		        JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2686 		        reiserfs_warning(p_s_sb,
2687 				"sh-463: bad transaction max batch (%u). FSCK?",
2688 				journal->j_max_batch);
2689 			return 1;
2690 		}
2691 	} else {
2692 		/* Default journal params.
2693                    The file system was created by old version
2694 		   of mkreiserfs, so some fields contain zeros,
2695 		   and we need to advise proper values for them */
2696 	        if (p_s_sb->s_blocksize != REISERFS_STANDARD_BLKSIZE)
2697 	                reiserfs_panic(p_s_sb, "sh-464: bad blocksize (%u)",
2698 				       p_s_sb->s_blocksize);
2699 		journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2700 		journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2701 		journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2702 	}
2703 	return 0;
2704 }
2705 
2706 /*
2707 ** must be called once on fs mount.  calls journal_read for you
2708 */
journal_init(struct super_block * p_s_sb,const char * j_dev_name,int old_format,unsigned int commit_max_age)2709 int journal_init(struct super_block *p_s_sb, const char *j_dev_name,
2710 		 int old_format, unsigned int commit_max_age)
2711 {
2712 	int num_cnodes = SB_ONDISK_JOURNAL_SIZE(p_s_sb) * 2;
2713 	struct buffer_head *bhjh;
2714 	struct reiserfs_super_block *rs;
2715 	struct reiserfs_journal_header *jh;
2716 	struct reiserfs_journal *journal;
2717 	struct reiserfs_journal_list *jl;
2718 	char b[BDEVNAME_SIZE];
2719 
2720 	journal = SB_JOURNAL(p_s_sb) = vmalloc(sizeof(struct reiserfs_journal));
2721 	if (!journal) {
2722 		reiserfs_warning(p_s_sb,
2723 				 "journal-1256: unable to get memory for journal structure");
2724 		return 1;
2725 	}
2726 	memset(journal, 0, sizeof(struct reiserfs_journal));
2727 	INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2728 	INIT_LIST_HEAD(&journal->j_prealloc_list);
2729 	INIT_LIST_HEAD(&journal->j_working_list);
2730 	INIT_LIST_HEAD(&journal->j_journal_list);
2731 	journal->j_persistent_trans = 0;
2732 	if (reiserfs_allocate_list_bitmaps(p_s_sb,
2733 					   journal->j_list_bitmap,
2734 					   reiserfs_bmap_count(p_s_sb)))
2735 		goto free_and_return;
2736 	allocate_bitmap_nodes(p_s_sb);
2737 
2738 	/* reserved for journal area support */
2739 	SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) = (old_format ?
2740 						 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2741 						 / p_s_sb->s_blocksize +
2742 						 reiserfs_bmap_count(p_s_sb) +
2743 						 1 :
2744 						 REISERFS_DISK_OFFSET_IN_BYTES /
2745 						 p_s_sb->s_blocksize + 2);
2746 
2747 	/* Sanity check to see is the standard journal fitting withing first bitmap
2748 	   (actual for small blocksizes) */
2749 	if (!SB_ONDISK_JOURNAL_DEVICE(p_s_sb) &&
2750 	    (SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) +
2751 	     SB_ONDISK_JOURNAL_SIZE(p_s_sb) > p_s_sb->s_blocksize * 8)) {
2752 		reiserfs_warning(p_s_sb,
2753 				 "journal-1393: journal does not fit for area "
2754 				 "addressed by first of bitmap blocks. It starts at "
2755 				 "%u and its size is %u. Block size %ld",
2756 				 SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb),
2757 				 SB_ONDISK_JOURNAL_SIZE(p_s_sb),
2758 				 p_s_sb->s_blocksize);
2759 		goto free_and_return;
2760 	}
2761 
2762 	if (journal_init_dev(p_s_sb, journal, j_dev_name) != 0) {
2763 		reiserfs_warning(p_s_sb,
2764 				 "sh-462: unable to initialize jornal device");
2765 		goto free_and_return;
2766 	}
2767 
2768 	rs = SB_DISK_SUPER_BLOCK(p_s_sb);
2769 
2770 	/* read journal header */
2771 	bhjh = journal_bread(p_s_sb,
2772 			     SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2773 			     SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2774 	if (!bhjh) {
2775 		reiserfs_warning(p_s_sb,
2776 				 "sh-459: unable to read journal header");
2777 		goto free_and_return;
2778 	}
2779 	jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2780 
2781 	/* make sure that journal matches to the super block */
2782 	if (is_reiserfs_jr(rs)
2783 	    && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2784 		sb_jp_journal_magic(rs))) {
2785 		reiserfs_warning(p_s_sb,
2786 				 "sh-460: journal header magic %x "
2787 				 "(device %s) does not match to magic found in super "
2788 				 "block %x", jh->jh_journal.jp_journal_magic,
2789 				 bdevname(journal->j_dev_bd, b),
2790 				 sb_jp_journal_magic(rs));
2791 		brelse(bhjh);
2792 		goto free_and_return;
2793 	}
2794 
2795 	journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2796 	journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2797 	journal->j_max_commit_age =
2798 	    le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2799 	journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2800 
2801 	if (check_advise_trans_params(p_s_sb, journal) != 0)
2802 	        goto free_and_return;
2803 	journal->j_default_max_commit_age = journal->j_max_commit_age;
2804 
2805 	if (commit_max_age != 0) {
2806 		journal->j_max_commit_age = commit_max_age;
2807 		journal->j_max_trans_age = commit_max_age;
2808 	}
2809 
2810 	reiserfs_info(p_s_sb, "journal params: device %s, size %u, "
2811 		      "journal first block %u, max trans len %u, max batch %u, "
2812 		      "max commit age %u, max trans age %u\n",
2813 		      bdevname(journal->j_dev_bd, b),
2814 		      SB_ONDISK_JOURNAL_SIZE(p_s_sb),
2815 		      SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2816 		      journal->j_trans_max,
2817 		      journal->j_max_batch,
2818 		      journal->j_max_commit_age, journal->j_max_trans_age);
2819 
2820 	brelse(bhjh);
2821 
2822 	journal->j_list_bitmap_index = 0;
2823 	journal_list_init(p_s_sb);
2824 
2825 	memset(journal->j_list_hash_table, 0,
2826 	       JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2827 
2828 	INIT_LIST_HEAD(&journal->j_dirty_buffers);
2829 	spin_lock_init(&journal->j_dirty_buffers_lock);
2830 
2831 	journal->j_start = 0;
2832 	journal->j_len = 0;
2833 	journal->j_len_alloc = 0;
2834 	atomic_set(&(journal->j_wcount), 0);
2835 	atomic_set(&(journal->j_async_throttle), 0);
2836 	journal->j_bcount = 0;
2837 	journal->j_trans_start_time = 0;
2838 	journal->j_last = NULL;
2839 	journal->j_first = NULL;
2840 	init_waitqueue_head(&(journal->j_join_wait));
2841 	mutex_init(&journal->j_mutex);
2842 	mutex_init(&journal->j_flush_mutex);
2843 
2844 	journal->j_trans_id = 10;
2845 	journal->j_mount_id = 10;
2846 	journal->j_state = 0;
2847 	atomic_set(&(journal->j_jlock), 0);
2848 	journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2849 	journal->j_cnode_free_orig = journal->j_cnode_free_list;
2850 	journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2851 	journal->j_cnode_used = 0;
2852 	journal->j_must_wait = 0;
2853 
2854 	if (journal->j_cnode_free == 0) {
2855         	reiserfs_warning(p_s_sb, "journal-2004: Journal cnode memory "
2856 		                 "allocation failed (%ld bytes). Journal is "
2857 		                 "too large for available memory. Usually "
2858 		                 "this is due to a journal that is too large.",
2859 		                 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2860         	goto free_and_return;
2861 	}
2862 
2863 	init_journal_hash(p_s_sb);
2864 	jl = journal->j_current_jl;
2865 	jl->j_list_bitmap = get_list_bitmap(p_s_sb, jl);
2866 	if (!jl->j_list_bitmap) {
2867 		reiserfs_warning(p_s_sb,
2868 				 "journal-2005, get_list_bitmap failed for journal list 0");
2869 		goto free_and_return;
2870 	}
2871 	if (journal_read(p_s_sb) < 0) {
2872 		reiserfs_warning(p_s_sb, "Replay Failure, unable to mount");
2873 		goto free_and_return;
2874 	}
2875 
2876 	reiserfs_mounted_fs_count++;
2877 	if (reiserfs_mounted_fs_count <= 1)
2878 		commit_wq = create_workqueue("reiserfs");
2879 
2880 	INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2881 	journal->j_work_sb = p_s_sb;
2882 	return 0;
2883       free_and_return:
2884 	free_journal_ram(p_s_sb);
2885 	return 1;
2886 }
2887 
2888 /*
2889 ** test for a polite end of the current transaction.  Used by file_write, and should
2890 ** be used by delete to make sure they don't write more than can fit inside a single
2891 ** transaction
2892 */
journal_transaction_should_end(struct reiserfs_transaction_handle * th,int new_alloc)2893 int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2894 				   int new_alloc)
2895 {
2896 	struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2897 	time_t now = get_seconds();
2898 	/* cannot restart while nested */
2899 	BUG_ON(!th->t_trans_id);
2900 	if (th->t_refcount > 1)
2901 		return 0;
2902 	if (journal->j_must_wait > 0 ||
2903 	    (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2904 	    atomic_read(&(journal->j_jlock)) ||
2905 	    (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2906 	    journal->j_cnode_free < (journal->j_trans_max * 3)) {
2907 		return 1;
2908 	}
2909 	/* protected by the BKL here */
2910 	journal->j_len_alloc += new_alloc;
2911 	th->t_blocks_allocated += new_alloc ;
2912 	return 0;
2913 }
2914 
2915 /* this must be called inside a transaction, and requires the
2916 ** kernel_lock to be held
2917 */
reiserfs_block_writes(struct reiserfs_transaction_handle * th)2918 void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2919 {
2920 	struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2921 	BUG_ON(!th->t_trans_id);
2922 	journal->j_must_wait = 1;
2923 	set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2924 	return;
2925 }
2926 
2927 /* this must be called without a transaction started, and does not
2928 ** require BKL
2929 */
reiserfs_allow_writes(struct super_block * s)2930 void reiserfs_allow_writes(struct super_block *s)
2931 {
2932 	struct reiserfs_journal *journal = SB_JOURNAL(s);
2933 	clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2934 	wake_up(&journal->j_join_wait);
2935 }
2936 
2937 /* this must be called without a transaction started, and does not
2938 ** require BKL
2939 */
reiserfs_wait_on_write_block(struct super_block * s)2940 void reiserfs_wait_on_write_block(struct super_block *s)
2941 {
2942 	struct reiserfs_journal *journal = SB_JOURNAL(s);
2943 	wait_event(journal->j_join_wait,
2944 		   !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2945 }
2946 
queue_log_writer(struct super_block * s)2947 static void queue_log_writer(struct super_block *s)
2948 {
2949 	wait_queue_t wait;
2950 	struct reiserfs_journal *journal = SB_JOURNAL(s);
2951 	set_bit(J_WRITERS_QUEUED, &journal->j_state);
2952 
2953 	/*
2954 	 * we don't want to use wait_event here because
2955 	 * we only want to wait once.
2956 	 */
2957 	init_waitqueue_entry(&wait, current);
2958 	add_wait_queue(&journal->j_join_wait, &wait);
2959 	set_current_state(TASK_UNINTERRUPTIBLE);
2960 	if (test_bit(J_WRITERS_QUEUED, &journal->j_state))
2961 		schedule();
2962 	__set_current_state(TASK_RUNNING);
2963 	remove_wait_queue(&journal->j_join_wait, &wait);
2964 }
2965 
wake_queued_writers(struct super_block * s)2966 static void wake_queued_writers(struct super_block *s)
2967 {
2968 	struct reiserfs_journal *journal = SB_JOURNAL(s);
2969 	if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2970 		wake_up(&journal->j_join_wait);
2971 }
2972 
let_transaction_grow(struct super_block * sb,unsigned long trans_id)2973 static void let_transaction_grow(struct super_block *sb, unsigned long trans_id)
2974 {
2975 	struct reiserfs_journal *journal = SB_JOURNAL(sb);
2976 	unsigned long bcount = journal->j_bcount;
2977 	while (1) {
2978 		schedule_timeout_uninterruptible(1);
2979 		journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2980 		while ((atomic_read(&journal->j_wcount) > 0 ||
2981 			atomic_read(&journal->j_jlock)) &&
2982 		       journal->j_trans_id == trans_id) {
2983 			queue_log_writer(sb);
2984 		}
2985 		if (journal->j_trans_id != trans_id)
2986 			break;
2987 		if (bcount == journal->j_bcount)
2988 			break;
2989 		bcount = journal->j_bcount;
2990 	}
2991 }
2992 
2993 /* join == true if you must join an existing transaction.
2994 ** join == false if you can deal with waiting for others to finish
2995 **
2996 ** this will block until the transaction is joinable.  send the number of blocks you
2997 ** expect to use in nblocks.
2998 */
do_journal_begin_r(struct reiserfs_transaction_handle * th,struct super_block * p_s_sb,unsigned long nblocks,int join)2999 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3000 			      struct super_block *p_s_sb, unsigned long nblocks,
3001 			      int join)
3002 {
3003 	time_t now = get_seconds();
3004 	int old_trans_id;
3005 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3006 	struct reiserfs_transaction_handle myth;
3007 	int sched_count = 0;
3008 	int retval;
3009 
3010 	reiserfs_check_lock_depth(p_s_sb, "journal_begin");
3011 	BUG_ON(nblocks > journal->j_trans_max);
3012 
3013 	PROC_INFO_INC(p_s_sb, journal.journal_being);
3014 	/* set here for journal_join */
3015 	th->t_refcount = 1;
3016 	th->t_super = p_s_sb;
3017 
3018       relock:
3019 	lock_journal(p_s_sb);
3020 	if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3021 		unlock_journal(p_s_sb);
3022 		retval = journal->j_errno;
3023 		goto out_fail;
3024 	}
3025 	journal->j_bcount++;
3026 
3027 	if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3028 		unlock_journal(p_s_sb);
3029 		reiserfs_wait_on_write_block(p_s_sb);
3030 		PROC_INFO_INC(p_s_sb, journal.journal_relock_writers);
3031 		goto relock;
3032 	}
3033 	now = get_seconds();
3034 
3035 	/* if there is no room in the journal OR
3036 	 ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning
3037 	 ** we don't sleep if there aren't other writers
3038 	 */
3039 
3040 	if ((!join && journal->j_must_wait > 0) ||
3041 	    (!join
3042 	     && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3043 	    || (!join && atomic_read(&journal->j_wcount) > 0
3044 		&& journal->j_trans_start_time > 0
3045 		&& (now - journal->j_trans_start_time) >
3046 		journal->j_max_trans_age) || (!join
3047 					      && atomic_read(&journal->j_jlock))
3048 	    || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3049 
3050 		old_trans_id = journal->j_trans_id;
3051 		unlock_journal(p_s_sb);	/* allow others to finish this transaction */
3052 
3053 		if (!join && (journal->j_len_alloc + nblocks + 2) >=
3054 		    journal->j_max_batch &&
3055 		    ((journal->j_len + nblocks + 2) * 100) <
3056 		    (journal->j_len_alloc * 75)) {
3057 			if (atomic_read(&journal->j_wcount) > 10) {
3058 				sched_count++;
3059 				queue_log_writer(p_s_sb);
3060 				goto relock;
3061 			}
3062 		}
3063 		/* don't mess with joining the transaction if all we have to do is
3064 		 * wait for someone else to do a commit
3065 		 */
3066 		if (atomic_read(&journal->j_jlock)) {
3067 			while (journal->j_trans_id == old_trans_id &&
3068 			       atomic_read(&journal->j_jlock)) {
3069 				queue_log_writer(p_s_sb);
3070 			}
3071 			goto relock;
3072 		}
3073 		retval = journal_join(&myth, p_s_sb, 1);
3074 		if (retval)
3075 			goto out_fail;
3076 
3077 		/* someone might have ended the transaction while we joined */
3078 		if (old_trans_id != journal->j_trans_id) {
3079 			retval = do_journal_end(&myth, p_s_sb, 1, 0);
3080 		} else {
3081 			retval = do_journal_end(&myth, p_s_sb, 1, COMMIT_NOW);
3082 		}
3083 
3084 		if (retval)
3085 			goto out_fail;
3086 
3087 		PROC_INFO_INC(p_s_sb, journal.journal_relock_wcount);
3088 		goto relock;
3089 	}
3090 	/* we are the first writer, set trans_id */
3091 	if (journal->j_trans_start_time == 0) {
3092 		journal->j_trans_start_time = get_seconds();
3093 	}
3094 	atomic_inc(&(journal->j_wcount));
3095 	journal->j_len_alloc += nblocks;
3096 	th->t_blocks_logged = 0;
3097 	th->t_blocks_allocated = nblocks;
3098 	th->t_trans_id = journal->j_trans_id;
3099 	unlock_journal(p_s_sb);
3100 	INIT_LIST_HEAD(&th->t_list);
3101 	get_fs_excl();
3102 	return 0;
3103 
3104       out_fail:
3105 	memset(th, 0, sizeof(*th));
3106 	/* Re-set th->t_super, so we can properly keep track of how many
3107 	 * persistent transactions there are. We need to do this so if this
3108 	 * call is part of a failed restart_transaction, we can free it later */
3109 	th->t_super = p_s_sb;
3110 	return retval;
3111 }
3112 
reiserfs_persistent_transaction(struct super_block * s,int nblocks)3113 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3114 								    super_block
3115 								    *s,
3116 								    int nblocks)
3117 {
3118 	int ret;
3119 	struct reiserfs_transaction_handle *th;
3120 
3121 	/* if we're nesting into an existing transaction.  It will be
3122 	 ** persistent on its own
3123 	 */
3124 	if (reiserfs_transaction_running(s)) {
3125 		th = current->journal_info;
3126 		th->t_refcount++;
3127 		BUG_ON(th->t_refcount < 2);
3128 
3129 		return th;
3130 	}
3131 	th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3132 	if (!th)
3133 		return NULL;
3134 	ret = journal_begin(th, s, nblocks);
3135 	if (ret) {
3136 		kfree(th);
3137 		return NULL;
3138 	}
3139 
3140 	SB_JOURNAL(s)->j_persistent_trans++;
3141 	return th;
3142 }
3143 
reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle * th)3144 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3145 {
3146 	struct super_block *s = th->t_super;
3147 	int ret = 0;
3148 	if (th->t_trans_id)
3149 		ret = journal_end(th, th->t_super, th->t_blocks_allocated);
3150 	else
3151 		ret = -EIO;
3152 	if (th->t_refcount == 0) {
3153 		SB_JOURNAL(s)->j_persistent_trans--;
3154 		kfree(th);
3155 	}
3156 	return ret;
3157 }
3158 
journal_join(struct reiserfs_transaction_handle * th,struct super_block * p_s_sb,unsigned long nblocks)3159 static int journal_join(struct reiserfs_transaction_handle *th,
3160 			struct super_block *p_s_sb, unsigned long nblocks)
3161 {
3162 	struct reiserfs_transaction_handle *cur_th = current->journal_info;
3163 
3164 	/* this keeps do_journal_end from NULLing out the current->journal_info
3165 	 ** pointer
3166 	 */
3167 	th->t_handle_save = cur_th;
3168 	BUG_ON(cur_th && cur_th->t_refcount > 1);
3169 	return do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_JOIN);
3170 }
3171 
journal_join_abort(struct reiserfs_transaction_handle * th,struct super_block * p_s_sb,unsigned long nblocks)3172 int journal_join_abort(struct reiserfs_transaction_handle *th,
3173 		       struct super_block *p_s_sb, unsigned long nblocks)
3174 {
3175 	struct reiserfs_transaction_handle *cur_th = current->journal_info;
3176 
3177 	/* this keeps do_journal_end from NULLing out the current->journal_info
3178 	 ** pointer
3179 	 */
3180 	th->t_handle_save = cur_th;
3181 	BUG_ON(cur_th && cur_th->t_refcount > 1);
3182 	return do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_ABORT);
3183 }
3184 
journal_begin(struct reiserfs_transaction_handle * th,struct super_block * p_s_sb,unsigned long nblocks)3185 int journal_begin(struct reiserfs_transaction_handle *th,
3186 		  struct super_block *p_s_sb, unsigned long nblocks)
3187 {
3188 	struct reiserfs_transaction_handle *cur_th = current->journal_info;
3189 	int ret;
3190 
3191 	th->t_handle_save = NULL;
3192 	if (cur_th) {
3193 		/* we are nesting into the current transaction */
3194 		if (cur_th->t_super == p_s_sb) {
3195 			BUG_ON(!cur_th->t_refcount);
3196 			cur_th->t_refcount++;
3197 			memcpy(th, cur_th, sizeof(*th));
3198 			if (th->t_refcount <= 1)
3199 				reiserfs_warning(p_s_sb,
3200 						 "BAD: refcount <= 1, but journal_info != 0");
3201 			return 0;
3202 		} else {
3203 			/* we've ended up with a handle from a different filesystem.
3204 			 ** save it and restore on journal_end.  This should never
3205 			 ** really happen...
3206 			 */
3207 			reiserfs_warning(p_s_sb,
3208 					 "clm-2100: nesting info a different FS");
3209 			th->t_handle_save = current->journal_info;
3210 			current->journal_info = th;
3211 		}
3212 	} else {
3213 		current->journal_info = th;
3214 	}
3215 	ret = do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_REG);
3216 	BUG_ON(current->journal_info != th);
3217 
3218 	/* I guess this boils down to being the reciprocal of clm-2100 above.
3219 	 * If do_journal_begin_r fails, we need to put it back, since journal_end
3220 	 * won't be called to do it. */
3221 	if (ret)
3222 		current->journal_info = th->t_handle_save;
3223 	else
3224 		BUG_ON(!th->t_refcount);
3225 
3226 	return ret;
3227 }
3228 
3229 /*
3230 ** puts bh into the current transaction.  If it was already there, reorders removes the
3231 ** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order).
3232 **
3233 ** if it was dirty, cleans and files onto the clean list.  I can't let it be dirty again until the
3234 ** transaction is committed.
3235 **
3236 ** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3237 */
journal_mark_dirty(struct reiserfs_transaction_handle * th,struct super_block * p_s_sb,struct buffer_head * bh)3238 int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3239 		       struct super_block *p_s_sb, struct buffer_head *bh)
3240 {
3241 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3242 	struct reiserfs_journal_cnode *cn = NULL;
3243 	int count_already_incd = 0;
3244 	int prepared = 0;
3245 	BUG_ON(!th->t_trans_id);
3246 
3247 	PROC_INFO_INC(p_s_sb, journal.mark_dirty);
3248 	if (th->t_trans_id != journal->j_trans_id) {
3249 		reiserfs_panic(th->t_super,
3250 			       "journal-1577: handle trans id %ld != current trans id %ld\n",
3251 			       th->t_trans_id, journal->j_trans_id);
3252 	}
3253 
3254 	p_s_sb->s_dirt = 1;
3255 
3256 	prepared = test_clear_buffer_journal_prepared(bh);
3257 	clear_buffer_journal_restore_dirty(bh);
3258 	/* already in this transaction, we are done */
3259 	if (buffer_journaled(bh)) {
3260 		PROC_INFO_INC(p_s_sb, journal.mark_dirty_already);
3261 		return 0;
3262 	}
3263 
3264 	/* this must be turned into a panic instead of a warning.  We can't allow
3265 	 ** a dirty or journal_dirty or locked buffer to be logged, as some changes
3266 	 ** could get to disk too early.  NOT GOOD.
3267 	 */
3268 	if (!prepared || buffer_dirty(bh)) {
3269 		reiserfs_warning(p_s_sb, "journal-1777: buffer %llu bad state "
3270 				 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3271 				 (unsigned long long)bh->b_blocknr,
3272 				 prepared ? ' ' : '!',
3273 				 buffer_locked(bh) ? ' ' : '!',
3274 				 buffer_dirty(bh) ? ' ' : '!',
3275 				 buffer_journal_dirty(bh) ? ' ' : '!');
3276 	}
3277 
3278 	if (atomic_read(&(journal->j_wcount)) <= 0) {
3279 		reiserfs_warning(p_s_sb,
3280 				 "journal-1409: journal_mark_dirty returning because j_wcount was %d",
3281 				 atomic_read(&(journal->j_wcount)));
3282 		return 1;
3283 	}
3284 	/* this error means I've screwed up, and we've overflowed the transaction.
3285 	 ** Nothing can be done here, except make the FS readonly or panic.
3286 	 */
3287 	if (journal->j_len >= journal->j_trans_max) {
3288 		reiserfs_panic(th->t_super,
3289 			       "journal-1413: journal_mark_dirty: j_len (%lu) is too big\n",
3290 			       journal->j_len);
3291 	}
3292 
3293 	if (buffer_journal_dirty(bh)) {
3294 		count_already_incd = 1;
3295 		PROC_INFO_INC(p_s_sb, journal.mark_dirty_notjournal);
3296 		clear_buffer_journal_dirty(bh);
3297 	}
3298 
3299 	if (journal->j_len > journal->j_len_alloc) {
3300 		journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3301 	}
3302 
3303 	set_buffer_journaled(bh);
3304 
3305 	/* now put this guy on the end */
3306 	if (!cn) {
3307 		cn = get_cnode(p_s_sb);
3308 		if (!cn) {
3309 			reiserfs_panic(p_s_sb, "get_cnode failed!\n");
3310 		}
3311 
3312 		if (th->t_blocks_logged == th->t_blocks_allocated) {
3313 			th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3314 			journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3315 		}
3316 		th->t_blocks_logged++;
3317 		journal->j_len++;
3318 
3319 		cn->bh = bh;
3320 		cn->blocknr = bh->b_blocknr;
3321 		cn->sb = p_s_sb;
3322 		cn->jlist = NULL;
3323 		insert_journal_hash(journal->j_hash_table, cn);
3324 		if (!count_already_incd) {
3325 			get_bh(bh);
3326 		}
3327 	}
3328 	cn->next = NULL;
3329 	cn->prev = journal->j_last;
3330 	cn->bh = bh;
3331 	if (journal->j_last) {
3332 		journal->j_last->next = cn;
3333 		journal->j_last = cn;
3334 	} else {
3335 		journal->j_first = cn;
3336 		journal->j_last = cn;
3337 	}
3338 	return 0;
3339 }
3340 
journal_end(struct reiserfs_transaction_handle * th,struct super_block * p_s_sb,unsigned long nblocks)3341 int journal_end(struct reiserfs_transaction_handle *th,
3342 		struct super_block *p_s_sb, unsigned long nblocks)
3343 {
3344 	if (!current->journal_info && th->t_refcount > 1)
3345 		reiserfs_warning(p_s_sb, "REISER-NESTING: th NULL, refcount %d",
3346 				 th->t_refcount);
3347 
3348 	if (!th->t_trans_id) {
3349 		WARN_ON(1);
3350 		return -EIO;
3351 	}
3352 
3353 	th->t_refcount--;
3354 	if (th->t_refcount > 0) {
3355 		struct reiserfs_transaction_handle *cur_th =
3356 		    current->journal_info;
3357 
3358 		/* we aren't allowed to close a nested transaction on a different
3359 		 ** filesystem from the one in the task struct
3360 		 */
3361 		BUG_ON(cur_th->t_super != th->t_super);
3362 
3363 		if (th != cur_th) {
3364 			memcpy(current->journal_info, th, sizeof(*th));
3365 			th->t_trans_id = 0;
3366 		}
3367 		return 0;
3368 	} else {
3369 		return do_journal_end(th, p_s_sb, nblocks, 0);
3370 	}
3371 }
3372 
3373 /* removes from the current transaction, relsing and descrementing any counters.
3374 ** also files the removed buffer directly onto the clean list
3375 **
3376 ** called by journal_mark_freed when a block has been deleted
3377 **
3378 ** returns 1 if it cleaned and relsed the buffer. 0 otherwise
3379 */
remove_from_transaction(struct super_block * p_s_sb,b_blocknr_t blocknr,int already_cleaned)3380 static int remove_from_transaction(struct super_block *p_s_sb,
3381 				   b_blocknr_t blocknr, int already_cleaned)
3382 {
3383 	struct buffer_head *bh;
3384 	struct reiserfs_journal_cnode *cn;
3385 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3386 	int ret = 0;
3387 
3388 	cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, blocknr);
3389 	if (!cn || !cn->bh) {
3390 		return ret;
3391 	}
3392 	bh = cn->bh;
3393 	if (cn->prev) {
3394 		cn->prev->next = cn->next;
3395 	}
3396 	if (cn->next) {
3397 		cn->next->prev = cn->prev;
3398 	}
3399 	if (cn == journal->j_first) {
3400 		journal->j_first = cn->next;
3401 	}
3402 	if (cn == journal->j_last) {
3403 		journal->j_last = cn->prev;
3404 	}
3405 	if (bh)
3406 		remove_journal_hash(p_s_sb, journal->j_hash_table, NULL,
3407 				    bh->b_blocknr, 0);
3408 	clear_buffer_journaled(bh);	/* don't log this one */
3409 
3410 	if (!already_cleaned) {
3411 		clear_buffer_journal_dirty(bh);
3412 		clear_buffer_dirty(bh);
3413 		clear_buffer_journal_test(bh);
3414 		put_bh(bh);
3415 		if (atomic_read(&(bh->b_count)) < 0) {
3416 			reiserfs_warning(p_s_sb,
3417 					 "journal-1752: remove from trans, b_count < 0");
3418 		}
3419 		ret = 1;
3420 	}
3421 	journal->j_len--;
3422 	journal->j_len_alloc--;
3423 	free_cnode(p_s_sb, cn);
3424 	return ret;
3425 }
3426 
3427 /*
3428 ** for any cnode in a journal list, it can only be dirtied of all the
3429 ** transactions that include it are committed to disk.
3430 ** this checks through each transaction, and returns 1 if you are allowed to dirty,
3431 ** and 0 if you aren't
3432 **
3433 ** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log
3434 ** blocks for a given transaction on disk
3435 **
3436 */
can_dirty(struct reiserfs_journal_cnode * cn)3437 static int can_dirty(struct reiserfs_journal_cnode *cn)
3438 {
3439 	struct super_block *sb = cn->sb;
3440 	b_blocknr_t blocknr = cn->blocknr;
3441 	struct reiserfs_journal_cnode *cur = cn->hprev;
3442 	int can_dirty = 1;
3443 
3444 	/* first test hprev.  These are all newer than cn, so any node here
3445 	 ** with the same block number and dev means this node can't be sent
3446 	 ** to disk right now.
3447 	 */
3448 	while (cur && can_dirty) {
3449 		if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3450 		    cur->blocknr == blocknr) {
3451 			can_dirty = 0;
3452 		}
3453 		cur = cur->hprev;
3454 	}
3455 	/* then test hnext.  These are all older than cn.  As long as they
3456 	 ** are committed to the log, it is safe to write cn to disk
3457 	 */
3458 	cur = cn->hnext;
3459 	while (cur && can_dirty) {
3460 		if (cur->jlist && cur->jlist->j_len > 0 &&
3461 		    atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh &&
3462 		    cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3463 			can_dirty = 0;
3464 		}
3465 		cur = cur->hnext;
3466 	}
3467 	return can_dirty;
3468 }
3469 
3470 /* syncs the commit blocks, but does not force the real buffers to disk
3471 ** will wait until the current transaction is done/committed before returning
3472 */
journal_end_sync(struct reiserfs_transaction_handle * th,struct super_block * p_s_sb,unsigned long nblocks)3473 int journal_end_sync(struct reiserfs_transaction_handle *th,
3474 		     struct super_block *p_s_sb, unsigned long nblocks)
3475 {
3476 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3477 
3478 	BUG_ON(!th->t_trans_id);
3479 	/* you can sync while nested, very, very bad */
3480 	BUG_ON(th->t_refcount > 1);
3481 	if (journal->j_len == 0) {
3482 		reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb),
3483 					     1);
3484 		journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb));
3485 	}
3486 	return do_journal_end(th, p_s_sb, nblocks, COMMIT_NOW | WAIT);
3487 }
3488 
3489 /*
3490 ** writeback the pending async commits to disk
3491 */
flush_async_commits(struct work_struct * work)3492 static void flush_async_commits(struct work_struct *work)
3493 {
3494 	struct reiserfs_journal *journal =
3495 		container_of(work, struct reiserfs_journal, j_work.work);
3496 	struct super_block *p_s_sb = journal->j_work_sb;
3497 	struct reiserfs_journal_list *jl;
3498 	struct list_head *entry;
3499 
3500 	lock_kernel();
3501 	if (!list_empty(&journal->j_journal_list)) {
3502 		/* last entry is the youngest, commit it and you get everything */
3503 		entry = journal->j_journal_list.prev;
3504 		jl = JOURNAL_LIST_ENTRY(entry);
3505 		flush_commit_list(p_s_sb, jl, 1);
3506 	}
3507 	unlock_kernel();
3508 }
3509 
3510 /*
3511 ** flushes any old transactions to disk
3512 ** ends the current transaction if it is too old
3513 */
reiserfs_flush_old_commits(struct super_block * p_s_sb)3514 int reiserfs_flush_old_commits(struct super_block *p_s_sb)
3515 {
3516 	time_t now;
3517 	struct reiserfs_transaction_handle th;
3518 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3519 
3520 	now = get_seconds();
3521 	/* safety check so we don't flush while we are replaying the log during
3522 	 * mount
3523 	 */
3524 	if (list_empty(&journal->j_journal_list)) {
3525 		return 0;
3526 	}
3527 
3528 	/* check the current transaction.  If there are no writers, and it is
3529 	 * too old, finish it, and force the commit blocks to disk
3530 	 */
3531 	if (atomic_read(&journal->j_wcount) <= 0 &&
3532 	    journal->j_trans_start_time > 0 &&
3533 	    journal->j_len > 0 &&
3534 	    (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3535 		if (!journal_join(&th, p_s_sb, 1)) {
3536 			reiserfs_prepare_for_journal(p_s_sb,
3537 						     SB_BUFFER_WITH_SB(p_s_sb),
3538 						     1);
3539 			journal_mark_dirty(&th, p_s_sb,
3540 					   SB_BUFFER_WITH_SB(p_s_sb));
3541 
3542 			/* we're only being called from kreiserfsd, it makes no sense to do
3543 			 ** an async commit so that kreiserfsd can do it later
3544 			 */
3545 			do_journal_end(&th, p_s_sb, 1, COMMIT_NOW | WAIT);
3546 		}
3547 	}
3548 	return p_s_sb->s_dirt;
3549 }
3550 
3551 /*
3552 ** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit
3553 **
3554 ** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all
3555 ** the writers are done.  By the time it wakes up, the transaction it was called has already ended, so it just
3556 ** flushes the commit list and returns 0.
3557 **
3558 ** Won't batch when flush or commit_now is set.  Also won't batch when others are waiting on j_join_wait.
3559 **
3560 ** Note, we can't allow the journal_end to proceed while there are still writers in the log.
3561 */
check_journal_end(struct reiserfs_transaction_handle * th,struct super_block * p_s_sb,unsigned long nblocks,int flags)3562 static int check_journal_end(struct reiserfs_transaction_handle *th,
3563 			     struct super_block *p_s_sb, unsigned long nblocks,
3564 			     int flags)
3565 {
3566 
3567 	time_t now;
3568 	int flush = flags & FLUSH_ALL;
3569 	int commit_now = flags & COMMIT_NOW;
3570 	int wait_on_commit = flags & WAIT;
3571 	struct reiserfs_journal_list *jl;
3572 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3573 
3574 	BUG_ON(!th->t_trans_id);
3575 
3576 	if (th->t_trans_id != journal->j_trans_id) {
3577 		reiserfs_panic(th->t_super,
3578 			       "journal-1577: handle trans id %ld != current trans id %ld\n",
3579 			       th->t_trans_id, journal->j_trans_id);
3580 	}
3581 
3582 	journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3583 	if (atomic_read(&(journal->j_wcount)) > 0) {	/* <= 0 is allowed.  unmounting might not call begin */
3584 		atomic_dec(&(journal->j_wcount));
3585 	}
3586 
3587 	/* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released
3588 	 ** will be dealt with by next transaction that actually writes something, but should be taken
3589 	 ** care of in this trans
3590 	 */
3591 	BUG_ON(journal->j_len == 0);
3592 
3593 	/* if wcount > 0, and we are called to with flush or commit_now,
3594 	 ** we wait on j_join_wait.  We will wake up when the last writer has
3595 	 ** finished the transaction, and started it on its way to the disk.
3596 	 ** Then, we flush the commit or journal list, and just return 0
3597 	 ** because the rest of journal end was already done for this transaction.
3598 	 */
3599 	if (atomic_read(&(journal->j_wcount)) > 0) {
3600 		if (flush || commit_now) {
3601 			unsigned trans_id;
3602 
3603 			jl = journal->j_current_jl;
3604 			trans_id = jl->j_trans_id;
3605 			if (wait_on_commit)
3606 				jl->j_state |= LIST_COMMIT_PENDING;
3607 			atomic_set(&(journal->j_jlock), 1);
3608 			if (flush) {
3609 				journal->j_next_full_flush = 1;
3610 			}
3611 			unlock_journal(p_s_sb);
3612 
3613 			/* sleep while the current transaction is still j_jlocked */
3614 			while (journal->j_trans_id == trans_id) {
3615 				if (atomic_read(&journal->j_jlock)) {
3616 					queue_log_writer(p_s_sb);
3617 				} else {
3618 					lock_journal(p_s_sb);
3619 					if (journal->j_trans_id == trans_id) {
3620 						atomic_set(&(journal->j_jlock),
3621 							   1);
3622 					}
3623 					unlock_journal(p_s_sb);
3624 				}
3625 			}
3626 			BUG_ON(journal->j_trans_id == trans_id);
3627 
3628 			if (commit_now
3629 			    && journal_list_still_alive(p_s_sb, trans_id)
3630 			    && wait_on_commit) {
3631 				flush_commit_list(p_s_sb, jl, 1);
3632 			}
3633 			return 0;
3634 		}
3635 		unlock_journal(p_s_sb);
3636 		return 0;
3637 	}
3638 
3639 	/* deal with old transactions where we are the last writers */
3640 	now = get_seconds();
3641 	if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3642 		commit_now = 1;
3643 		journal->j_next_async_flush = 1;
3644 	}
3645 	/* don't batch when someone is waiting on j_join_wait */
3646 	/* don't batch when syncing the commit or flushing the whole trans */
3647 	if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock)))
3648 	    && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3649 	    && journal->j_len_alloc < journal->j_max_batch
3650 	    && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3651 		journal->j_bcount++;
3652 		unlock_journal(p_s_sb);
3653 		return 0;
3654 	}
3655 
3656 	if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(p_s_sb)) {
3657 		reiserfs_panic(p_s_sb,
3658 			       "journal-003: journal_end: j_start (%ld) is too high\n",
3659 			       journal->j_start);
3660 	}
3661 	return 1;
3662 }
3663 
3664 /*
3665 ** Does all the work that makes deleting blocks safe.
3666 ** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on.
3667 **
3668 ** otherwise:
3669 ** set a bit for the block in the journal bitmap.  That will prevent it from being allocated for unformatted nodes
3670 ** before this transaction has finished.
3671 **
3672 ** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.  That will prevent any old transactions with
3673 ** this block from trying to flush to the real location.  Since we aren't removing the cnode from the journal_list_hash,
3674 ** the block can't be reallocated yet.
3675 **
3676 ** Then remove it from the current transaction, decrementing any counters and filing it on the clean list.
3677 */
journal_mark_freed(struct reiserfs_transaction_handle * th,struct super_block * p_s_sb,b_blocknr_t blocknr)3678 int journal_mark_freed(struct reiserfs_transaction_handle *th,
3679 		       struct super_block *p_s_sb, b_blocknr_t blocknr)
3680 {
3681 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3682 	struct reiserfs_journal_cnode *cn = NULL;
3683 	struct buffer_head *bh = NULL;
3684 	struct reiserfs_list_bitmap *jb = NULL;
3685 	int cleaned = 0;
3686 	BUG_ON(!th->t_trans_id);
3687 
3688 	cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, blocknr);
3689 	if (cn && cn->bh) {
3690 		bh = cn->bh;
3691 		get_bh(bh);
3692 	}
3693 	/* if it is journal new, we just remove it from this transaction */
3694 	if (bh && buffer_journal_new(bh)) {
3695 		clear_buffer_journal_new(bh);
3696 		clear_prepared_bits(bh);
3697 		reiserfs_clean_and_file_buffer(bh);
3698 		cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned);
3699 	} else {
3700 		/* set the bit for this block in the journal bitmap for this transaction */
3701 		jb = journal->j_current_jl->j_list_bitmap;
3702 		if (!jb) {
3703 			reiserfs_panic(p_s_sb,
3704 				       "journal-1702: journal_mark_freed, journal_list_bitmap is NULL\n");
3705 		}
3706 		set_bit_in_list_bitmap(p_s_sb, blocknr, jb);
3707 
3708 		/* Note, the entire while loop is not allowed to schedule.  */
3709 
3710 		if (bh) {
3711 			clear_prepared_bits(bh);
3712 			reiserfs_clean_and_file_buffer(bh);
3713 		}
3714 		cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned);
3715 
3716 		/* find all older transactions with this block, make sure they don't try to write it out */
3717 		cn = get_journal_hash_dev(p_s_sb, journal->j_list_hash_table,
3718 					  blocknr);
3719 		while (cn) {
3720 			if (p_s_sb == cn->sb && blocknr == cn->blocknr) {
3721 				set_bit(BLOCK_FREED, &cn->state);
3722 				if (cn->bh) {
3723 					if (!cleaned) {
3724 						/* remove_from_transaction will brelse the buffer if it was
3725 						 ** in the current trans
3726 						 */
3727 						clear_buffer_journal_dirty(cn->
3728 									   bh);
3729 						clear_buffer_dirty(cn->bh);
3730 						clear_buffer_journal_test(cn->
3731 									  bh);
3732 						cleaned = 1;
3733 						put_bh(cn->bh);
3734 						if (atomic_read
3735 						    (&(cn->bh->b_count)) < 0) {
3736 							reiserfs_warning(p_s_sb,
3737 									 "journal-2138: cn->bh->b_count < 0");
3738 						}
3739 					}
3740 					if (cn->jlist) {	/* since we are clearing the bh, we MUST dec nonzerolen */
3741 						atomic_dec(&
3742 							   (cn->jlist->
3743 							    j_nonzerolen));
3744 					}
3745 					cn->bh = NULL;
3746 				}
3747 			}
3748 			cn = cn->hnext;
3749 		}
3750 	}
3751 
3752 	if (bh)
3753 		release_buffer_page(bh); /* get_hash grabs the buffer */
3754 	return 0;
3755 }
3756 
reiserfs_update_inode_transaction(struct inode * inode)3757 void reiserfs_update_inode_transaction(struct inode *inode)
3758 {
3759 	struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3760 	REISERFS_I(inode)->i_jl = journal->j_current_jl;
3761 	REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3762 }
3763 
3764 /*
3765  * returns -1 on error, 0 if no commits/barriers were done and 1
3766  * if a transaction was actually committed and the barrier was done
3767  */
__commit_trans_jl(struct inode * inode,unsigned long id,struct reiserfs_journal_list * jl)3768 static int __commit_trans_jl(struct inode *inode, unsigned long id,
3769 			     struct reiserfs_journal_list *jl)
3770 {
3771 	struct reiserfs_transaction_handle th;
3772 	struct super_block *sb = inode->i_sb;
3773 	struct reiserfs_journal *journal = SB_JOURNAL(sb);
3774 	int ret = 0;
3775 
3776 	/* is it from the current transaction, or from an unknown transaction? */
3777 	if (id == journal->j_trans_id) {
3778 		jl = journal->j_current_jl;
3779 		/* try to let other writers come in and grow this transaction */
3780 		let_transaction_grow(sb, id);
3781 		if (journal->j_trans_id != id) {
3782 			goto flush_commit_only;
3783 		}
3784 
3785 		ret = journal_begin(&th, sb, 1);
3786 		if (ret)
3787 			return ret;
3788 
3789 		/* someone might have ended this transaction while we joined */
3790 		if (journal->j_trans_id != id) {
3791 			reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3792 						     1);
3793 			journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb));
3794 			ret = journal_end(&th, sb, 1);
3795 			goto flush_commit_only;
3796 		}
3797 
3798 		ret = journal_end_sync(&th, sb, 1);
3799 		if (!ret)
3800 			ret = 1;
3801 
3802 	} else {
3803 		/* this gets tricky, we have to make sure the journal list in
3804 		 * the inode still exists.  We know the list is still around
3805 		 * if we've got a larger transaction id than the oldest list
3806 		 */
3807 	      flush_commit_only:
3808 		if (journal_list_still_alive(inode->i_sb, id)) {
3809 			/*
3810 			 * we only set ret to 1 when we know for sure
3811 			 * the barrier hasn't been started yet on the commit
3812 			 * block.
3813 			 */
3814 			if (atomic_read(&jl->j_commit_left) > 1)
3815 				ret = 1;
3816 			flush_commit_list(sb, jl, 1);
3817 			if (journal->j_errno)
3818 				ret = journal->j_errno;
3819 		}
3820 	}
3821 	/* otherwise the list is gone, and long since committed */
3822 	return ret;
3823 }
3824 
reiserfs_commit_for_inode(struct inode * inode)3825 int reiserfs_commit_for_inode(struct inode *inode)
3826 {
3827 	unsigned long id = REISERFS_I(inode)->i_trans_id;
3828 	struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3829 
3830 	/* for the whole inode, assume unset id means it was
3831 	 * changed in the current transaction.  More conservative
3832 	 */
3833 	if (!id || !jl) {
3834 		reiserfs_update_inode_transaction(inode);
3835 		id = REISERFS_I(inode)->i_trans_id;
3836 		/* jl will be updated in __commit_trans_jl */
3837 	}
3838 
3839 	return __commit_trans_jl(inode, id, jl);
3840 }
3841 
reiserfs_restore_prepared_buffer(struct super_block * p_s_sb,struct buffer_head * bh)3842 void reiserfs_restore_prepared_buffer(struct super_block *p_s_sb,
3843 				      struct buffer_head *bh)
3844 {
3845 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3846 	PROC_INFO_INC(p_s_sb, journal.restore_prepared);
3847 	if (!bh) {
3848 		return;
3849 	}
3850 	if (test_clear_buffer_journal_restore_dirty(bh) &&
3851 	    buffer_journal_dirty(bh)) {
3852 		struct reiserfs_journal_cnode *cn;
3853 		cn = get_journal_hash_dev(p_s_sb,
3854 					  journal->j_list_hash_table,
3855 					  bh->b_blocknr);
3856 		if (cn && can_dirty(cn)) {
3857 			set_buffer_journal_test(bh);
3858 			mark_buffer_dirty(bh);
3859 		}
3860 	}
3861 	clear_buffer_journal_prepared(bh);
3862 }
3863 
3864 extern struct tree_balance *cur_tb;
3865 /*
3866 ** before we can change a metadata block, we have to make sure it won't
3867 ** be written to disk while we are altering it.  So, we must:
3868 ** clean it
3869 ** wait on it.
3870 **
3871 */
reiserfs_prepare_for_journal(struct super_block * p_s_sb,struct buffer_head * bh,int wait)3872 int reiserfs_prepare_for_journal(struct super_block *p_s_sb,
3873 				 struct buffer_head *bh, int wait)
3874 {
3875 	PROC_INFO_INC(p_s_sb, journal.prepare);
3876 
3877 	if (!trylock_buffer(bh)) {
3878 		if (!wait)
3879 			return 0;
3880 		lock_buffer(bh);
3881 	}
3882 	set_buffer_journal_prepared(bh);
3883 	if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3884 		clear_buffer_journal_test(bh);
3885 		set_buffer_journal_restore_dirty(bh);
3886 	}
3887 	unlock_buffer(bh);
3888 	return 1;
3889 }
3890 
flush_old_journal_lists(struct super_block * s)3891 static void flush_old_journal_lists(struct super_block *s)
3892 {
3893 	struct reiserfs_journal *journal = SB_JOURNAL(s);
3894 	struct reiserfs_journal_list *jl;
3895 	struct list_head *entry;
3896 	time_t now = get_seconds();
3897 
3898 	while (!list_empty(&journal->j_journal_list)) {
3899 		entry = journal->j_journal_list.next;
3900 		jl = JOURNAL_LIST_ENTRY(entry);
3901 		/* this check should always be run, to send old lists to disk */
3902 		if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4)) &&
3903 		    atomic_read(&jl->j_commit_left) == 0 &&
3904 		    test_transaction(s, jl)) {
3905 			flush_used_journal_lists(s, jl);
3906 		} else {
3907 			break;
3908 		}
3909 	}
3910 }
3911 
3912 /*
3913 ** long and ugly.  If flush, will not return until all commit
3914 ** blocks and all real buffers in the trans are on disk.
3915 ** If no_async, won't return until all commit blocks are on disk.
3916 **
3917 ** keep reading, there are comments as you go along
3918 **
3919 ** If the journal is aborted, we just clean up. Things like flushing
3920 ** journal lists, etc just won't happen.
3921 */
do_journal_end(struct reiserfs_transaction_handle * th,struct super_block * p_s_sb,unsigned long nblocks,int flags)3922 static int do_journal_end(struct reiserfs_transaction_handle *th,
3923 			  struct super_block *p_s_sb, unsigned long nblocks,
3924 			  int flags)
3925 {
3926 	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3927 	struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3928 	struct reiserfs_journal_cnode *last_cn = NULL;
3929 	struct reiserfs_journal_desc *desc;
3930 	struct reiserfs_journal_commit *commit;
3931 	struct buffer_head *c_bh;	/* commit bh */
3932 	struct buffer_head *d_bh;	/* desc bh */
3933 	int cur_write_start = 0;	/* start index of current log write */
3934 	int old_start;
3935 	int i;
3936 	int flush;
3937 	int wait_on_commit;
3938 	struct reiserfs_journal_list *jl, *temp_jl;
3939 	struct list_head *entry, *safe;
3940 	unsigned long jindex;
3941 	unsigned long commit_trans_id;
3942 	int trans_half;
3943 
3944 	BUG_ON(th->t_refcount > 1);
3945 	BUG_ON(!th->t_trans_id);
3946 
3947 	/* protect flush_older_commits from doing mistakes if the
3948            transaction ID counter gets overflowed.  */
3949 	if (th->t_trans_id == ~0UL)
3950 		flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
3951 	flush = flags & FLUSH_ALL;
3952 	wait_on_commit = flags & WAIT;
3953 
3954 	put_fs_excl();
3955 	current->journal_info = th->t_handle_save;
3956 	reiserfs_check_lock_depth(p_s_sb, "journal end");
3957 	if (journal->j_len == 0) {
3958 		reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb),
3959 					     1);
3960 		journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb));
3961 	}
3962 
3963 	lock_journal(p_s_sb);
3964 	if (journal->j_next_full_flush) {
3965 		flags |= FLUSH_ALL;
3966 		flush = 1;
3967 	}
3968 	if (journal->j_next_async_flush) {
3969 		flags |= COMMIT_NOW | WAIT;
3970 		wait_on_commit = 1;
3971 	}
3972 
3973 	/* check_journal_end locks the journal, and unlocks if it does not return 1
3974 	 ** it tells us if we should continue with the journal_end, or just return
3975 	 */
3976 	if (!check_journal_end(th, p_s_sb, nblocks, flags)) {
3977 		p_s_sb->s_dirt = 1;
3978 		wake_queued_writers(p_s_sb);
3979 		reiserfs_async_progress_wait(p_s_sb);
3980 		goto out;
3981 	}
3982 
3983 	/* check_journal_end might set these, check again */
3984 	if (journal->j_next_full_flush) {
3985 		flush = 1;
3986 	}
3987 
3988 	/*
3989 	 ** j must wait means we have to flush the log blocks, and the real blocks for
3990 	 ** this transaction
3991 	 */
3992 	if (journal->j_must_wait > 0) {
3993 		flush = 1;
3994 	}
3995 #ifdef REISERFS_PREALLOCATE
3996 	/* quota ops might need to nest, setup the journal_info pointer for them
3997 	 * and raise the refcount so that it is > 0. */
3998 	current->journal_info = th;
3999 	th->t_refcount++;
4000 	reiserfs_discard_all_prealloc(th);	/* it should not involve new blocks into
4001 						 * the transaction */
4002 	th->t_refcount--;
4003 	current->journal_info = th->t_handle_save;
4004 #endif
4005 
4006 	/* setup description block */
4007 	d_bh =
4008 	    journal_getblk(p_s_sb,
4009 			   SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
4010 			   journal->j_start);
4011 	set_buffer_uptodate(d_bh);
4012 	desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4013 	memset(d_bh->b_data, 0, d_bh->b_size);
4014 	memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4015 	set_desc_trans_id(desc, journal->j_trans_id);
4016 
4017 	/* setup commit block.  Don't write (keep it clean too) this one until after everyone else is written */
4018 	c_bh = journal_getblk(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
4019 			      ((journal->j_start + journal->j_len +
4020 				1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
4021 	commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4022 	memset(c_bh->b_data, 0, c_bh->b_size);
4023 	set_commit_trans_id(commit, journal->j_trans_id);
4024 	set_buffer_uptodate(c_bh);
4025 
4026 	/* init this journal list */
4027 	jl = journal->j_current_jl;
4028 
4029 	/* we lock the commit before doing anything because
4030 	 * we want to make sure nobody tries to run flush_commit_list until
4031 	 * the new transaction is fully setup, and we've already flushed the
4032 	 * ordered bh list
4033 	 */
4034 	mutex_lock(&jl->j_commit_mutex);
4035 
4036 	/* save the transaction id in case we need to commit it later */
4037 	commit_trans_id = jl->j_trans_id;
4038 
4039 	atomic_set(&jl->j_older_commits_done, 0);
4040 	jl->j_trans_id = journal->j_trans_id;
4041 	jl->j_timestamp = journal->j_trans_start_time;
4042 	jl->j_commit_bh = c_bh;
4043 	jl->j_start = journal->j_start;
4044 	jl->j_len = journal->j_len;
4045 	atomic_set(&jl->j_nonzerolen, journal->j_len);
4046 	atomic_set(&jl->j_commit_left, journal->j_len + 2);
4047 	jl->j_realblock = NULL;
4048 
4049 	/* The ENTIRE FOR LOOP MUST not cause schedule to occur.
4050 	 **  for each real block, add it to the journal list hash,
4051 	 ** copy into real block index array in the commit or desc block
4052 	 */
4053 	trans_half = journal_trans_half(p_s_sb->s_blocksize);
4054 	for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4055 		if (buffer_journaled(cn->bh)) {
4056 			jl_cn = get_cnode(p_s_sb);
4057 			if (!jl_cn) {
4058 				reiserfs_panic(p_s_sb,
4059 					       "journal-1676, get_cnode returned NULL\n");
4060 			}
4061 			if (i == 0) {
4062 				jl->j_realblock = jl_cn;
4063 			}
4064 			jl_cn->prev = last_cn;
4065 			jl_cn->next = NULL;
4066 			if (last_cn) {
4067 				last_cn->next = jl_cn;
4068 			}
4069 			last_cn = jl_cn;
4070 			/* make sure the block we are trying to log is not a block
4071 			   of journal or reserved area */
4072 
4073 			if (is_block_in_log_or_reserved_area
4074 			    (p_s_sb, cn->bh->b_blocknr)) {
4075 				reiserfs_panic(p_s_sb,
4076 					       "journal-2332: Trying to log block %lu, which is a log block\n",
4077 					       cn->bh->b_blocknr);
4078 			}
4079 			jl_cn->blocknr = cn->bh->b_blocknr;
4080 			jl_cn->state = 0;
4081 			jl_cn->sb = p_s_sb;
4082 			jl_cn->bh = cn->bh;
4083 			jl_cn->jlist = jl;
4084 			insert_journal_hash(journal->j_list_hash_table, jl_cn);
4085 			if (i < trans_half) {
4086 				desc->j_realblock[i] =
4087 				    cpu_to_le32(cn->bh->b_blocknr);
4088 			} else {
4089 				commit->j_realblock[i - trans_half] =
4090 				    cpu_to_le32(cn->bh->b_blocknr);
4091 			}
4092 		} else {
4093 			i--;
4094 		}
4095 	}
4096 	set_desc_trans_len(desc, journal->j_len);
4097 	set_desc_mount_id(desc, journal->j_mount_id);
4098 	set_desc_trans_id(desc, journal->j_trans_id);
4099 	set_commit_trans_len(commit, journal->j_len);
4100 
4101 	/* special check in case all buffers in the journal were marked for not logging */
4102 	BUG_ON(journal->j_len == 0);
4103 
4104 	/* we're about to dirty all the log blocks, mark the description block
4105 	 * dirty now too.  Don't mark the commit block dirty until all the
4106 	 * others are on disk
4107 	 */
4108 	mark_buffer_dirty(d_bh);
4109 
4110 	/* first data block is j_start + 1, so add one to cur_write_start wherever you use it */
4111 	cur_write_start = journal->j_start;
4112 	cn = journal->j_first;
4113 	jindex = 1;		/* start at one so we don't get the desc again */
4114 	while (cn) {
4115 		clear_buffer_journal_new(cn->bh);
4116 		/* copy all the real blocks into log area.  dirty log blocks */
4117 		if (buffer_journaled(cn->bh)) {
4118 			struct buffer_head *tmp_bh;
4119 			char *addr;
4120 			struct page *page;
4121 			tmp_bh =
4122 			    journal_getblk(p_s_sb,
4123 					   SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
4124 					   ((cur_write_start +
4125 					     jindex) %
4126 					    SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
4127 			set_buffer_uptodate(tmp_bh);
4128 			page = cn->bh->b_page;
4129 			addr = kmap(page);
4130 			memcpy(tmp_bh->b_data,
4131 			       addr + offset_in_page(cn->bh->b_data),
4132 			       cn->bh->b_size);
4133 			kunmap(page);
4134 			mark_buffer_dirty(tmp_bh);
4135 			jindex++;
4136 			set_buffer_journal_dirty(cn->bh);
4137 			clear_buffer_journaled(cn->bh);
4138 		} else {
4139 			/* JDirty cleared sometime during transaction.  don't log this one */
4140 			reiserfs_warning(p_s_sb,
4141 					 "journal-2048: do_journal_end: BAD, buffer in journal hash, but not JDirty!");
4142 			brelse(cn->bh);
4143 		}
4144 		next = cn->next;
4145 		free_cnode(p_s_sb, cn);
4146 		cn = next;
4147 		cond_resched();
4148 	}
4149 
4150 	/* we are done  with both the c_bh and d_bh, but
4151 	 ** c_bh must be written after all other commit blocks,
4152 	 ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4153 	 */
4154 
4155 	journal->j_current_jl = alloc_journal_list(p_s_sb);
4156 
4157 	/* now it is safe to insert this transaction on the main list */
4158 	list_add_tail(&jl->j_list, &journal->j_journal_list);
4159 	list_add_tail(&jl->j_working_list, &journal->j_working_list);
4160 	journal->j_num_work_lists++;
4161 
4162 	/* reset journal values for the next transaction */
4163 	old_start = journal->j_start;
4164 	journal->j_start =
4165 	    (journal->j_start + journal->j_len +
4166 	     2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb);
4167 	atomic_set(&(journal->j_wcount), 0);
4168 	journal->j_bcount = 0;
4169 	journal->j_last = NULL;
4170 	journal->j_first = NULL;
4171 	journal->j_len = 0;
4172 	journal->j_trans_start_time = 0;
4173 	/* check for trans_id overflow */
4174 	if (++journal->j_trans_id == 0)
4175 		journal->j_trans_id = 10;
4176 	journal->j_current_jl->j_trans_id = journal->j_trans_id;
4177 	journal->j_must_wait = 0;
4178 	journal->j_len_alloc = 0;
4179 	journal->j_next_full_flush = 0;
4180 	journal->j_next_async_flush = 0;
4181 	init_journal_hash(p_s_sb);
4182 
4183 	// make sure reiserfs_add_jh sees the new current_jl before we
4184 	// write out the tails
4185 	smp_mb();
4186 
4187 	/* tail conversion targets have to hit the disk before we end the
4188 	 * transaction.  Otherwise a later transaction might repack the tail
4189 	 * before this transaction commits, leaving the data block unflushed and
4190 	 * clean, if we crash before the later transaction commits, the data block
4191 	 * is lost.
4192 	 */
4193 	if (!list_empty(&jl->j_tail_bh_list)) {
4194 		unlock_kernel();
4195 		write_ordered_buffers(&journal->j_dirty_buffers_lock,
4196 				      journal, jl, &jl->j_tail_bh_list);
4197 		lock_kernel();
4198 	}
4199 	BUG_ON(!list_empty(&jl->j_tail_bh_list));
4200 	mutex_unlock(&jl->j_commit_mutex);
4201 
4202 	/* honor the flush wishes from the caller, simple commits can
4203 	 ** be done outside the journal lock, they are done below
4204 	 **
4205 	 ** if we don't flush the commit list right now, we put it into
4206 	 ** the work queue so the people waiting on the async progress work
4207 	 ** queue don't wait for this proc to flush journal lists and such.
4208 	 */
4209 	if (flush) {
4210 		flush_commit_list(p_s_sb, jl, 1);
4211 		flush_journal_list(p_s_sb, jl, 1);
4212 	} else if (!(jl->j_state & LIST_COMMIT_PENDING))
4213 		queue_delayed_work(commit_wq, &journal->j_work, HZ / 10);
4214 
4215 	/* if the next transaction has any chance of wrapping, flush
4216 	 ** transactions that might get overwritten.  If any journal lists are very
4217 	 ** old flush them as well.
4218 	 */
4219       first_jl:
4220 	list_for_each_safe(entry, safe, &journal->j_journal_list) {
4221 		temp_jl = JOURNAL_LIST_ENTRY(entry);
4222 		if (journal->j_start <= temp_jl->j_start) {
4223 			if ((journal->j_start + journal->j_trans_max + 1) >=
4224 			    temp_jl->j_start) {
4225 				flush_used_journal_lists(p_s_sb, temp_jl);
4226 				goto first_jl;
4227 			} else if ((journal->j_start +
4228 				    journal->j_trans_max + 1) <
4229 				   SB_ONDISK_JOURNAL_SIZE(p_s_sb)) {
4230 				/* if we don't cross into the next transaction and we don't
4231 				 * wrap, there is no way we can overlap any later transactions
4232 				 * break now
4233 				 */
4234 				break;
4235 			}
4236 		} else if ((journal->j_start +
4237 			    journal->j_trans_max + 1) >
4238 			   SB_ONDISK_JOURNAL_SIZE(p_s_sb)) {
4239 			if (((journal->j_start + journal->j_trans_max + 1) %
4240 			     SB_ONDISK_JOURNAL_SIZE(p_s_sb)) >=
4241 			    temp_jl->j_start) {
4242 				flush_used_journal_lists(p_s_sb, temp_jl);
4243 				goto first_jl;
4244 			} else {
4245 				/* we don't overlap anything from out start to the end of the
4246 				 * log, and our wrapped portion doesn't overlap anything at
4247 				 * the start of the log.  We can break
4248 				 */
4249 				break;
4250 			}
4251 		}
4252 	}
4253 	flush_old_journal_lists(p_s_sb);
4254 
4255 	journal->j_current_jl->j_list_bitmap =
4256 	    get_list_bitmap(p_s_sb, journal->j_current_jl);
4257 
4258 	if (!(journal->j_current_jl->j_list_bitmap)) {
4259 		reiserfs_panic(p_s_sb,
4260 			       "journal-1996: do_journal_end, could not get a list bitmap\n");
4261 	}
4262 
4263 	atomic_set(&(journal->j_jlock), 0);
4264 	unlock_journal(p_s_sb);
4265 	/* wake up any body waiting to join. */
4266 	clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4267 	wake_up(&(journal->j_join_wait));
4268 
4269 	if (!flush && wait_on_commit &&
4270 	    journal_list_still_alive(p_s_sb, commit_trans_id)) {
4271 		flush_commit_list(p_s_sb, jl, 1);
4272 	}
4273       out:
4274 	reiserfs_check_lock_depth(p_s_sb, "journal end2");
4275 
4276 	memset(th, 0, sizeof(*th));
4277 	/* Re-set th->t_super, so we can properly keep track of how many
4278 	 * persistent transactions there are. We need to do this so if this
4279 	 * call is part of a failed restart_transaction, we can free it later */
4280 	th->t_super = p_s_sb;
4281 
4282 	return journal->j_errno;
4283 }
4284 
__reiserfs_journal_abort_hard(struct super_block * sb)4285 static void __reiserfs_journal_abort_hard(struct super_block *sb)
4286 {
4287 	struct reiserfs_journal *journal = SB_JOURNAL(sb);
4288 	if (test_bit(J_ABORTED, &journal->j_state))
4289 		return;
4290 
4291 	printk(KERN_CRIT "REISERFS: Aborting journal for filesystem on %s\n",
4292 	       reiserfs_bdevname(sb));
4293 
4294 	sb->s_flags |= MS_RDONLY;
4295 	set_bit(J_ABORTED, &journal->j_state);
4296 
4297 #ifdef CONFIG_REISERFS_CHECK
4298 	dump_stack();
4299 #endif
4300 }
4301 
__reiserfs_journal_abort_soft(struct super_block * sb,int errno)4302 static void __reiserfs_journal_abort_soft(struct super_block *sb, int errno)
4303 {
4304 	struct reiserfs_journal *journal = SB_JOURNAL(sb);
4305 	if (test_bit(J_ABORTED, &journal->j_state))
4306 		return;
4307 
4308 	if (!journal->j_errno)
4309 		journal->j_errno = errno;
4310 
4311 	__reiserfs_journal_abort_hard(sb);
4312 }
4313 
reiserfs_journal_abort(struct super_block * sb,int errno)4314 void reiserfs_journal_abort(struct super_block *sb, int errno)
4315 {
4316 	__reiserfs_journal_abort_soft(sb, errno);
4317 }
4318