Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394...
[pandora-kernel.git] / fs / gfs2 / lops.c
1 /*
2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
4  *
5  * This copyrighted material is made available to anyone wishing to use,
6  * modify, copy, or redistribute it subject to the terms and conditions
7  * of the GNU General Public License version 2.
8  */
9
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/gfs2_ondisk.h>
16 #include <linux/bio.h>
17 #include <linux/fs.h>
18
19 #include "gfs2.h"
20 #include "incore.h"
21 #include "inode.h"
22 #include "glock.h"
23 #include "log.h"
24 #include "lops.h"
25 #include "meta_io.h"
26 #include "recovery.h"
27 #include "rgrp.h"
28 #include "trans.h"
29 #include "util.h"
30 #include "trace_gfs2.h"
31
32 /**
33  * gfs2_pin - Pin a buffer in memory
34  * @sdp: The superblock
35  * @bh: The buffer to be pinned
36  *
37  * The log lock must be held when calling this function
38  */
39 static void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
40 {
41         struct gfs2_bufdata *bd;
42
43         BUG_ON(!current->journal_info);
44
45         clear_buffer_dirty(bh);
46         if (test_set_buffer_pinned(bh))
47                 gfs2_assert_withdraw(sdp, 0);
48         if (!buffer_uptodate(bh))
49                 gfs2_io_error_bh(sdp, bh);
50         bd = bh->b_private;
51         /* If this buffer is in the AIL and it has already been written
52          * to in-place disk block, remove it from the AIL.
53          */
54         spin_lock(&sdp->sd_ail_lock);
55         if (bd->bd_ail)
56                 list_move(&bd->bd_ail_st_list, &bd->bd_ail->ai_ail2_list);
57         spin_unlock(&sdp->sd_ail_lock);
58         get_bh(bh);
59         atomic_inc(&sdp->sd_log_pinned);
60         trace_gfs2_pin(bd, 1);
61 }
62
63 static bool buffer_is_rgrp(const struct gfs2_bufdata *bd)
64 {
65         return bd->bd_gl->gl_name.ln_type == LM_TYPE_RGRP;
66 }
67
68 static void maybe_release_space(struct gfs2_bufdata *bd)
69 {
70         struct gfs2_glock *gl = bd->bd_gl;
71         struct gfs2_sbd *sdp = gl->gl_sbd;
72         struct gfs2_rgrpd *rgd = gl->gl_object;
73         unsigned int index = bd->bd_bh->b_blocknr - gl->gl_name.ln_number;
74         struct gfs2_bitmap *bi = rgd->rd_bits + index;
75
76         if (bi->bi_clone == 0)
77                 return;
78         if (sdp->sd_args.ar_discard)
79                 gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bd->bd_bh, bi);
80         memcpy(bi->bi_clone + bi->bi_offset,
81                bd->bd_bh->b_data + bi->bi_offset, bi->bi_len);
82         clear_bit(GBF_FULL, &bi->bi_flags);
83         rgd->rd_free_clone = rgd->rd_free;
84 }
85
86 /**
87  * gfs2_unpin - Unpin a buffer
88  * @sdp: the filesystem the buffer belongs to
89  * @bh: The buffer to unpin
90  * @ai:
91  * @flags: The inode dirty flags
92  *
93  */
94
95 static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
96                        struct gfs2_ail *ai)
97 {
98         struct gfs2_bufdata *bd = bh->b_private;
99
100         BUG_ON(!buffer_uptodate(bh));
101         BUG_ON(!buffer_pinned(bh));
102
103         lock_buffer(bh);
104         mark_buffer_dirty(bh);
105         clear_buffer_pinned(bh);
106
107         if (buffer_is_rgrp(bd))
108                 maybe_release_space(bd);
109
110         spin_lock(&sdp->sd_ail_lock);
111         if (bd->bd_ail) {
112                 list_del(&bd->bd_ail_st_list);
113                 brelse(bh);
114         } else {
115                 struct gfs2_glock *gl = bd->bd_gl;
116                 list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
117                 atomic_inc(&gl->gl_ail_count);
118         }
119         bd->bd_ail = ai;
120         list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list);
121         spin_unlock(&sdp->sd_ail_lock);
122
123         clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
124         trace_gfs2_pin(bd, 0);
125         unlock_buffer(bh);
126         atomic_dec(&sdp->sd_log_pinned);
127 }
128
129
130 static inline struct gfs2_log_descriptor *bh_log_desc(struct buffer_head *bh)
131 {
132         return (struct gfs2_log_descriptor *)bh->b_data;
133 }
134
135 static inline __be64 *bh_log_ptr(struct buffer_head *bh)
136 {
137         struct gfs2_log_descriptor *ld = bh_log_desc(bh);
138         return (__force __be64 *)(ld + 1);
139 }
140
141 static inline __be64 *bh_ptr_end(struct buffer_head *bh)
142 {
143         return (__force __be64 *)(bh->b_data + bh->b_size);
144 }
145
146
147 static struct buffer_head *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type)
148 {
149         struct buffer_head *bh = gfs2_log_get_buf(sdp);
150         struct gfs2_log_descriptor *ld = bh_log_desc(bh);
151         ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
152         ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
153         ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
154         ld->ld_type = cpu_to_be32(ld_type);
155         ld->ld_length = 0;
156         ld->ld_data1 = 0;
157         ld->ld_data2 = 0;
158         memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
159         return bh;
160 }
161
162 static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
163 {
164         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
165         struct gfs2_meta_header *mh;
166         struct gfs2_trans *tr;
167
168         lock_buffer(bd->bd_bh);
169         gfs2_log_lock(sdp);
170         if (!list_empty(&bd->bd_list_tr))
171                 goto out;
172         tr = current->journal_info;
173         tr->tr_touched = 1;
174         tr->tr_num_buf++;
175         list_add(&bd->bd_list_tr, &tr->tr_list_buf);
176         if (!list_empty(&le->le_list))
177                 goto out;
178         set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
179         set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
180         gfs2_meta_check(sdp, bd->bd_bh);
181         gfs2_pin(sdp, bd->bd_bh);
182         mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
183         mh->__pad0 = cpu_to_be64(0);
184         mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
185         sdp->sd_log_num_buf++;
186         list_add(&le->le_list, &sdp->sd_log_le_buf);
187         tr->tr_num_buf_new++;
188 out:
189         gfs2_log_unlock(sdp);
190         unlock_buffer(bd->bd_bh);
191 }
192
193 static void buf_lo_before_commit(struct gfs2_sbd *sdp)
194 {
195         struct buffer_head *bh;
196         struct gfs2_log_descriptor *ld;
197         struct gfs2_bufdata *bd1 = NULL, *bd2;
198         unsigned int total;
199         unsigned int limit;
200         unsigned int num;
201         unsigned n;
202         __be64 *ptr;
203
204         limit = buf_limit(sdp);
205         /* for 4k blocks, limit = 503 */
206
207         gfs2_log_lock(sdp);
208         total = sdp->sd_log_num_buf;
209         bd1 = bd2 = list_prepare_entry(bd1, &sdp->sd_log_le_buf, bd_le.le_list);
210         while(total) {
211                 num = total;
212                 if (total > limit)
213                         num = limit;
214                 gfs2_log_unlock(sdp);
215                 bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_METADATA);
216                 gfs2_log_lock(sdp);
217                 ld = bh_log_desc(bh);
218                 ptr = bh_log_ptr(bh);
219                 ld->ld_length = cpu_to_be32(num + 1);
220                 ld->ld_data1 = cpu_to_be32(num);
221
222                 n = 0;
223                 list_for_each_entry_continue(bd1, &sdp->sd_log_le_buf,
224                                              bd_le.le_list) {
225                         *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
226                         if (++n >= num)
227                                 break;
228                 }
229
230                 gfs2_log_unlock(sdp);
231                 submit_bh(WRITE_SYNC, bh);
232                 gfs2_log_lock(sdp);
233
234                 n = 0;
235                 list_for_each_entry_continue(bd2, &sdp->sd_log_le_buf,
236                                              bd_le.le_list) {
237                         get_bh(bd2->bd_bh);
238                         gfs2_log_unlock(sdp);
239                         lock_buffer(bd2->bd_bh);
240                         bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
241                         submit_bh(WRITE_SYNC, bh);
242                         gfs2_log_lock(sdp);
243                         if (++n >= num)
244                                 break;
245                 }
246
247                 BUG_ON(total < num);
248                 total -= num;
249         }
250         gfs2_log_unlock(sdp);
251 }
252
253 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
254 {
255         struct list_head *head = &sdp->sd_log_le_buf;
256         struct gfs2_bufdata *bd;
257
258         while (!list_empty(head)) {
259                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
260                 list_del_init(&bd->bd_le.le_list);
261                 sdp->sd_log_num_buf--;
262
263                 gfs2_unpin(sdp, bd->bd_bh, ai);
264         }
265         gfs2_assert_warn(sdp, !sdp->sd_log_num_buf);
266 }
267
268 static void buf_lo_before_scan(struct gfs2_jdesc *jd,
269                                struct gfs2_log_header_host *head, int pass)
270 {
271         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
272
273         if (pass != 0)
274                 return;
275
276         sdp->sd_found_blocks = 0;
277         sdp->sd_replayed_blocks = 0;
278 }
279
280 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
281                                 struct gfs2_log_descriptor *ld, __be64 *ptr,
282                                 int pass)
283 {
284         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
285         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
286         struct gfs2_glock *gl = ip->i_gl;
287         unsigned int blks = be32_to_cpu(ld->ld_data1);
288         struct buffer_head *bh_log, *bh_ip;
289         u64 blkno;
290         int error = 0;
291
292         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
293                 return 0;
294
295         gfs2_replay_incr_blk(sdp, &start);
296
297         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
298                 blkno = be64_to_cpu(*ptr++);
299
300                 sdp->sd_found_blocks++;
301
302                 if (gfs2_revoke_check(sdp, blkno, start))
303                         continue;
304
305                 error = gfs2_replay_read_block(jd, start, &bh_log);
306                 if (error)
307                         return error;
308
309                 bh_ip = gfs2_meta_new(gl, blkno);
310                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
311
312                 if (gfs2_meta_check(sdp, bh_ip))
313                         error = -EIO;
314                 else
315                         mark_buffer_dirty(bh_ip);
316
317                 brelse(bh_log);
318                 brelse(bh_ip);
319
320                 if (error)
321                         break;
322
323                 sdp->sd_replayed_blocks++;
324         }
325
326         return error;
327 }
328
329 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
330 {
331         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
332         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
333
334         if (error) {
335                 gfs2_meta_sync(ip->i_gl);
336                 return;
337         }
338         if (pass != 1)
339                 return;
340
341         gfs2_meta_sync(ip->i_gl);
342
343         fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
344                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
345 }
346
347 static void revoke_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
348 {
349         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
350         struct gfs2_glock *gl = bd->bd_gl;
351         struct gfs2_trans *tr;
352
353         tr = current->journal_info;
354         tr->tr_touched = 1;
355         tr->tr_num_revoke++;
356         sdp->sd_log_num_revoke++;
357         atomic_inc(&gl->gl_revokes);
358         set_bit(GLF_LFLUSH, &gl->gl_flags);
359         list_add(&le->le_list, &sdp->sd_log_le_revoke);
360 }
361
362 static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
363 {
364         struct gfs2_log_descriptor *ld;
365         struct gfs2_meta_header *mh;
366         struct buffer_head *bh;
367         unsigned int offset;
368         struct list_head *head = &sdp->sd_log_le_revoke;
369         struct gfs2_bufdata *bd;
370
371         if (!sdp->sd_log_num_revoke)
372                 return;
373
374         bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE);
375         ld = bh_log_desc(bh);
376         ld->ld_length = cpu_to_be32(gfs2_struct2blk(sdp, sdp->sd_log_num_revoke,
377                                                     sizeof(u64)));
378         ld->ld_data1 = cpu_to_be32(sdp->sd_log_num_revoke);
379         offset = sizeof(struct gfs2_log_descriptor);
380
381         list_for_each_entry(bd, head, bd_le.le_list) {
382                 sdp->sd_log_num_revoke--;
383
384                 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
385                         submit_bh(WRITE_SYNC, bh);
386
387                         bh = gfs2_log_get_buf(sdp);
388                         mh = (struct gfs2_meta_header *)bh->b_data;
389                         mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
390                         mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
391                         mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
392                         offset = sizeof(struct gfs2_meta_header);
393                 }
394
395                 *(__be64 *)(bh->b_data + offset) = cpu_to_be64(bd->bd_blkno);
396                 offset += sizeof(u64);
397         }
398         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
399
400         submit_bh(WRITE_SYNC, bh);
401 }
402
403 static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
404 {
405         struct list_head *head = &sdp->sd_log_le_revoke;
406         struct gfs2_bufdata *bd;
407         struct gfs2_glock *gl;
408
409         while (!list_empty(head)) {
410                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
411                 list_del_init(&bd->bd_le.le_list);
412                 gl = bd->bd_gl;
413                 atomic_dec(&gl->gl_revokes);
414                 clear_bit(GLF_LFLUSH, &gl->gl_flags);
415                 kmem_cache_free(gfs2_bufdata_cachep, bd);
416         }
417 }
418
419 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
420                                   struct gfs2_log_header_host *head, int pass)
421 {
422         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
423
424         if (pass != 0)
425                 return;
426
427         sdp->sd_found_revokes = 0;
428         sdp->sd_replay_tail = head->lh_tail;
429 }
430
431 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
432                                    struct gfs2_log_descriptor *ld, __be64 *ptr,
433                                    int pass)
434 {
435         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
436         unsigned int blks = be32_to_cpu(ld->ld_length);
437         unsigned int revokes = be32_to_cpu(ld->ld_data1);
438         struct buffer_head *bh;
439         unsigned int offset;
440         u64 blkno;
441         int first = 1;
442         int error;
443
444         if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
445                 return 0;
446
447         offset = sizeof(struct gfs2_log_descriptor);
448
449         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
450                 error = gfs2_replay_read_block(jd, start, &bh);
451                 if (error)
452                         return error;
453
454                 if (!first)
455                         gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
456
457                 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
458                         blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
459
460                         error = gfs2_revoke_add(sdp, blkno, start);
461                         if (error < 0) {
462                                 brelse(bh);
463                                 return error;
464                         }
465                         else if (error)
466                                 sdp->sd_found_revokes++;
467
468                         if (!--revokes)
469                                 break;
470                         offset += sizeof(u64);
471                 }
472
473                 brelse(bh);
474                 offset = sizeof(struct gfs2_meta_header);
475                 first = 0;
476         }
477
478         return 0;
479 }
480
481 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
482 {
483         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
484
485         if (error) {
486                 gfs2_revoke_clean(sdp);
487                 return;
488         }
489         if (pass != 1)
490                 return;
491
492         fs_info(sdp, "jid=%u: Found %u revoke tags\n",
493                 jd->jd_jid, sdp->sd_found_revokes);
494
495         gfs2_revoke_clean(sdp);
496 }
497
498 /**
499  * databuf_lo_add - Add a databuf to the transaction.
500  *
501  * This is used in two distinct cases:
502  * i) In ordered write mode
503  *    We put the data buffer on a list so that we can ensure that its
504  *    synced to disk at the right time
505  * ii) In journaled data mode
506  *    We need to journal the data block in the same way as metadata in
507  *    the functions above. The difference is that here we have a tag
508  *    which is two __be64's being the block number (as per meta data)
509  *    and a flag which says whether the data block needs escaping or
510  *    not. This means we need a new log entry for each 251 or so data
511  *    blocks, which isn't an enormous overhead but twice as much as
512  *    for normal metadata blocks.
513  */
514 static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
515 {
516         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
517         struct gfs2_trans *tr = current->journal_info;
518         struct address_space *mapping = bd->bd_bh->b_page->mapping;
519         struct gfs2_inode *ip = GFS2_I(mapping->host);
520
521         lock_buffer(bd->bd_bh);
522         gfs2_log_lock(sdp);
523         if (tr) {
524                 if (!list_empty(&bd->bd_list_tr))
525                         goto out;
526                 tr->tr_touched = 1;
527                 if (gfs2_is_jdata(ip)) {
528                         tr->tr_num_buf++;
529                         list_add(&bd->bd_list_tr, &tr->tr_list_buf);
530                 }
531         }
532         if (!list_empty(&le->le_list))
533                 goto out;
534
535         set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
536         set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
537         if (gfs2_is_jdata(ip)) {
538                 gfs2_pin(sdp, bd->bd_bh);
539                 tr->tr_num_databuf_new++;
540                 sdp->sd_log_num_databuf++;
541                 list_add_tail(&le->le_list, &sdp->sd_log_le_databuf);
542         } else {
543                 list_add_tail(&le->le_list, &sdp->sd_log_le_ordered);
544         }
545 out:
546         gfs2_log_unlock(sdp);
547         unlock_buffer(bd->bd_bh);
548 }
549
550 static void gfs2_check_magic(struct buffer_head *bh)
551 {
552         void *kaddr;
553         __be32 *ptr;
554
555         clear_buffer_escaped(bh);
556         kaddr = kmap_atomic(bh->b_page, KM_USER0);
557         ptr = kaddr + bh_offset(bh);
558         if (*ptr == cpu_to_be32(GFS2_MAGIC))
559                 set_buffer_escaped(bh);
560         kunmap_atomic(kaddr, KM_USER0);
561 }
562
563 static void gfs2_write_blocks(struct gfs2_sbd *sdp, struct buffer_head *bh,
564                               struct list_head *list, struct list_head *done,
565                               unsigned int n)
566 {
567         struct buffer_head *bh1;
568         struct gfs2_log_descriptor *ld;
569         struct gfs2_bufdata *bd;
570         __be64 *ptr;
571
572         if (!bh)
573                 return;
574
575         ld = bh_log_desc(bh);
576         ld->ld_length = cpu_to_be32(n + 1);
577         ld->ld_data1 = cpu_to_be32(n);
578
579         ptr = bh_log_ptr(bh);
580         
581         get_bh(bh);
582         submit_bh(WRITE_SYNC, bh);
583         gfs2_log_lock(sdp);
584         while(!list_empty(list)) {
585                 bd = list_entry(list->next, struct gfs2_bufdata, bd_le.le_list);
586                 list_move_tail(&bd->bd_le.le_list, done);
587                 get_bh(bd->bd_bh);
588                 while (be64_to_cpu(*ptr) != bd->bd_bh->b_blocknr) {
589                         gfs2_log_incr_head(sdp);
590                         ptr += 2;
591                 }
592                 gfs2_log_unlock(sdp);
593                 lock_buffer(bd->bd_bh);
594                 if (buffer_escaped(bd->bd_bh)) {
595                         void *kaddr;
596                         bh1 = gfs2_log_get_buf(sdp);
597                         kaddr = kmap_atomic(bd->bd_bh->b_page, KM_USER0);
598                         memcpy(bh1->b_data, kaddr + bh_offset(bd->bd_bh),
599                                bh1->b_size);
600                         kunmap_atomic(kaddr, KM_USER0);
601                         *(__be32 *)bh1->b_data = 0;
602                         clear_buffer_escaped(bd->bd_bh);
603                         unlock_buffer(bd->bd_bh);
604                         brelse(bd->bd_bh);
605                 } else {
606                         bh1 = gfs2_log_fake_buf(sdp, bd->bd_bh);
607                 }
608                 submit_bh(WRITE_SYNC, bh1);
609                 gfs2_log_lock(sdp);
610                 ptr += 2;
611         }
612         gfs2_log_unlock(sdp);
613         brelse(bh);
614 }
615
616 /**
617  * databuf_lo_before_commit - Scan the data buffers, writing as we go
618  *
619  */
620
621 static void databuf_lo_before_commit(struct gfs2_sbd *sdp)
622 {
623         struct gfs2_bufdata *bd = NULL;
624         struct buffer_head *bh = NULL;
625         unsigned int n = 0;
626         __be64 *ptr = NULL, *end = NULL;
627         LIST_HEAD(processed);
628         LIST_HEAD(in_progress);
629
630         gfs2_log_lock(sdp);
631         while (!list_empty(&sdp->sd_log_le_databuf)) {
632                 if (ptr == end) {
633                         gfs2_log_unlock(sdp);
634                         gfs2_write_blocks(sdp, bh, &in_progress, &processed, n);
635                         n = 0;
636                         bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_JDATA);
637                         ptr = bh_log_ptr(bh);
638                         end = bh_ptr_end(bh) - 1;
639                         gfs2_log_lock(sdp);
640                         continue;
641                 }
642                 bd = list_entry(sdp->sd_log_le_databuf.next, struct gfs2_bufdata, bd_le.le_list);
643                 list_move_tail(&bd->bd_le.le_list, &in_progress);
644                 gfs2_check_magic(bd->bd_bh);
645                 *ptr++ = cpu_to_be64(bd->bd_bh->b_blocknr);
646                 *ptr++ = cpu_to_be64(buffer_escaped(bh) ? 1 : 0);
647                 n++;
648         }
649         gfs2_log_unlock(sdp);
650         gfs2_write_blocks(sdp, bh, &in_progress, &processed, n);
651         gfs2_log_lock(sdp);
652         list_splice(&processed, &sdp->sd_log_le_databuf);
653         gfs2_log_unlock(sdp);
654 }
655
656 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
657                                     struct gfs2_log_descriptor *ld,
658                                     __be64 *ptr, int pass)
659 {
660         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
661         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
662         struct gfs2_glock *gl = ip->i_gl;
663         unsigned int blks = be32_to_cpu(ld->ld_data1);
664         struct buffer_head *bh_log, *bh_ip;
665         u64 blkno;
666         u64 esc;
667         int error = 0;
668
669         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
670                 return 0;
671
672         gfs2_replay_incr_blk(sdp, &start);
673         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
674                 blkno = be64_to_cpu(*ptr++);
675                 esc = be64_to_cpu(*ptr++);
676
677                 sdp->sd_found_blocks++;
678
679                 if (gfs2_revoke_check(sdp, blkno, start))
680                         continue;
681
682                 error = gfs2_replay_read_block(jd, start, &bh_log);
683                 if (error)
684                         return error;
685
686                 bh_ip = gfs2_meta_new(gl, blkno);
687                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
688
689                 /* Unescape */
690                 if (esc) {
691                         __be32 *eptr = (__be32 *)bh_ip->b_data;
692                         *eptr = cpu_to_be32(GFS2_MAGIC);
693                 }
694                 mark_buffer_dirty(bh_ip);
695
696                 brelse(bh_log);
697                 brelse(bh_ip);
698
699                 sdp->sd_replayed_blocks++;
700         }
701
702         return error;
703 }
704
705 /* FIXME: sort out accounting for log blocks etc. */
706
707 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
708 {
709         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
710         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
711
712         if (error) {
713                 gfs2_meta_sync(ip->i_gl);
714                 return;
715         }
716         if (pass != 1)
717                 return;
718
719         /* data sync? */
720         gfs2_meta_sync(ip->i_gl);
721
722         fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
723                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
724 }
725
726 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
727 {
728         struct list_head *head = &sdp->sd_log_le_databuf;
729         struct gfs2_bufdata *bd;
730
731         while (!list_empty(head)) {
732                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
733                 list_del_init(&bd->bd_le.le_list);
734                 sdp->sd_log_num_databuf--;
735                 gfs2_unpin(sdp, bd->bd_bh, ai);
736         }
737         gfs2_assert_warn(sdp, !sdp->sd_log_num_databuf);
738 }
739
740
741 const struct gfs2_log_operations gfs2_buf_lops = {
742         .lo_add = buf_lo_add,
743         .lo_before_commit = buf_lo_before_commit,
744         .lo_after_commit = buf_lo_after_commit,
745         .lo_before_scan = buf_lo_before_scan,
746         .lo_scan_elements = buf_lo_scan_elements,
747         .lo_after_scan = buf_lo_after_scan,
748         .lo_name = "buf",
749 };
750
751 const struct gfs2_log_operations gfs2_revoke_lops = {
752         .lo_add = revoke_lo_add,
753         .lo_before_commit = revoke_lo_before_commit,
754         .lo_after_commit = revoke_lo_after_commit,
755         .lo_before_scan = revoke_lo_before_scan,
756         .lo_scan_elements = revoke_lo_scan_elements,
757         .lo_after_scan = revoke_lo_after_scan,
758         .lo_name = "revoke",
759 };
760
761 const struct gfs2_log_operations gfs2_rg_lops = {
762         .lo_name = "rg",
763 };
764
765 const struct gfs2_log_operations gfs2_databuf_lops = {
766         .lo_add = databuf_lo_add,
767         .lo_before_commit = databuf_lo_before_commit,
768         .lo_after_commit = databuf_lo_after_commit,
769         .lo_scan_elements = databuf_lo_scan_elements,
770         .lo_after_scan = databuf_lo_after_scan,
771         .lo_name = "databuf",
772 };
773
774 const struct gfs2_log_operations *gfs2_log_ops[] = {
775         &gfs2_databuf_lops,
776         &gfs2_buf_lops,
777         &gfs2_rg_lops,
778         &gfs2_revoke_lops,
779         NULL,
780 };
781