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Linux/fs/gfs2/lops.c

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  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/mempool.h>
 16 #include <linux/gfs2_ondisk.h>
 17 #include <linux/bio.h>
 18 #include <linux/fs.h>
 19 #include <linux/list_sort.h>
 20 
 21 #include "dir.h"
 22 #include "gfs2.h"
 23 #include "incore.h"
 24 #include "inode.h"
 25 #include "glock.h"
 26 #include "log.h"
 27 #include "lops.h"
 28 #include "meta_io.h"
 29 #include "recovery.h"
 30 #include "rgrp.h"
 31 #include "trans.h"
 32 #include "util.h"
 33 #include "trace_gfs2.h"
 34 
 35 /**
 36  * gfs2_pin - Pin a buffer in memory
 37  * @sdp: The superblock
 38  * @bh: The buffer to be pinned
 39  *
 40  * The log lock must be held when calling this function
 41  */
 42 void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
 43 {
 44         struct gfs2_bufdata *bd;
 45 
 46         BUG_ON(!current->journal_info);
 47 
 48         clear_buffer_dirty(bh);
 49         if (test_set_buffer_pinned(bh))
 50                 gfs2_assert_withdraw(sdp, 0);
 51         if (!buffer_uptodate(bh))
 52                 gfs2_io_error_bh(sdp, bh);
 53         bd = bh->b_private;
 54         /* If this buffer is in the AIL and it has already been written
 55          * to in-place disk block, remove it from the AIL.
 56          */
 57         spin_lock(&sdp->sd_ail_lock);
 58         if (bd->bd_tr)
 59                 list_move(&bd->bd_ail_st_list, &bd->bd_tr->tr_ail2_list);
 60         spin_unlock(&sdp->sd_ail_lock);
 61         get_bh(bh);
 62         atomic_inc(&sdp->sd_log_pinned);
 63         trace_gfs2_pin(bd, 1);
 64 }
 65 
 66 static bool buffer_is_rgrp(const struct gfs2_bufdata *bd)
 67 {
 68         return bd->bd_gl->gl_name.ln_type == LM_TYPE_RGRP;
 69 }
 70 
 71 static void maybe_release_space(struct gfs2_bufdata *bd)
 72 {
 73         struct gfs2_glock *gl = bd->bd_gl;
 74         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 75         struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
 76         unsigned int index = bd->bd_bh->b_blocknr - gl->gl_name.ln_number;
 77         struct gfs2_bitmap *bi = rgd->rd_bits + index;
 78 
 79         if (bi->bi_clone == NULL)
 80                 return;
 81         if (sdp->sd_args.ar_discard)
 82                 gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bd->bd_bh, bi, 1, NULL);
 83         memcpy(bi->bi_clone + bi->bi_offset,
 84                bd->bd_bh->b_data + bi->bi_offset, bi->bi_len);
 85         clear_bit(GBF_FULL, &bi->bi_flags);
 86         rgd->rd_free_clone = rgd->rd_free;
 87         rgd->rd_extfail_pt = rgd->rd_free;
 88 }
 89 
 90 /**
 91  * gfs2_unpin - Unpin a buffer
 92  * @sdp: the filesystem the buffer belongs to
 93  * @bh: The buffer to unpin
 94  * @ai:
 95  * @flags: The inode dirty flags
 96  *
 97  */
 98 
 99 static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
100                        struct gfs2_trans *tr)
101 {
102         struct gfs2_bufdata *bd = bh->b_private;
103 
104         BUG_ON(!buffer_uptodate(bh));
105         BUG_ON(!buffer_pinned(bh));
106 
107         lock_buffer(bh);
108         mark_buffer_dirty(bh);
109         clear_buffer_pinned(bh);
110 
111         if (buffer_is_rgrp(bd))
112                 maybe_release_space(bd);
113 
114         spin_lock(&sdp->sd_ail_lock);
115         if (bd->bd_tr) {
116                 list_del(&bd->bd_ail_st_list);
117                 brelse(bh);
118         } else {
119                 struct gfs2_glock *gl = bd->bd_gl;
120                 list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
121                 atomic_inc(&gl->gl_ail_count);
122         }
123         bd->bd_tr = tr;
124         list_add(&bd->bd_ail_st_list, &tr->tr_ail1_list);
125         spin_unlock(&sdp->sd_ail_lock);
126 
127         clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
128         trace_gfs2_pin(bd, 0);
129         unlock_buffer(bh);
130         atomic_dec(&sdp->sd_log_pinned);
131 }
132 
133 static void gfs2_log_incr_head(struct gfs2_sbd *sdp)
134 {
135         BUG_ON((sdp->sd_log_flush_head == sdp->sd_log_tail) &&
136                (sdp->sd_log_flush_head != sdp->sd_log_head));
137 
138         if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks)
139                 sdp->sd_log_flush_head = 0;
140 }
141 
142 u64 gfs2_log_bmap(struct gfs2_sbd *sdp)
143 {
144         unsigned int lbn = sdp->sd_log_flush_head;
145         struct gfs2_journal_extent *je;
146         u64 block;
147 
148         list_for_each_entry(je, &sdp->sd_jdesc->extent_list, list) {
149                 if ((lbn >= je->lblock) && (lbn < (je->lblock + je->blocks))) {
150                         block = je->dblock + lbn - je->lblock;
151                         gfs2_log_incr_head(sdp);
152                         return block;
153                 }
154         }
155 
156         return -1;
157 }
158 
159 /**
160  * gfs2_end_log_write_bh - end log write of pagecache data with buffers
161  * @sdp: The superblock
162  * @bvec: The bio_vec
163  * @error: The i/o status
164  *
165  * This finds the relevant buffers and unlocks them and sets the
166  * error flag according to the status of the i/o request. This is
167  * used when the log is writing data which has an in-place version
168  * that is pinned in the pagecache.
169  */
170 
171 static void gfs2_end_log_write_bh(struct gfs2_sbd *sdp, struct bio_vec *bvec,
172                                   blk_status_t error)
173 {
174         struct buffer_head *bh, *next;
175         struct page *page = bvec->bv_page;
176         unsigned size;
177 
178         bh = page_buffers(page);
179         size = bvec->bv_len;
180         while (bh_offset(bh) < bvec->bv_offset)
181                 bh = bh->b_this_page;
182         do {
183                 if (error)
184                         mark_buffer_write_io_error(bh);
185                 unlock_buffer(bh);
186                 next = bh->b_this_page;
187                 size -= bh->b_size;
188                 brelse(bh);
189                 bh = next;
190         } while(bh && size);
191 }
192 
193 /**
194  * gfs2_end_log_write - end of i/o to the log
195  * @bio: The bio
196  * @error: Status of i/o request
197  *
198  * Each bio_vec contains either data from the pagecache or data
199  * relating to the log itself. Here we iterate over the bio_vec
200  * array, processing both kinds of data.
201  *
202  */
203 
204 static void gfs2_end_log_write(struct bio *bio)
205 {
206         struct gfs2_sbd *sdp = bio->bi_private;
207         struct bio_vec *bvec;
208         struct page *page;
209         int i;
210 
211         if (bio->bi_status) {
212                 fs_err(sdp, "Error %d writing to journal, jid=%u\n",
213                        bio->bi_status, sdp->sd_jdesc->jd_jid);
214                 wake_up(&sdp->sd_logd_waitq);
215         }
216 
217         bio_for_each_segment_all(bvec, bio, i) {
218                 page = bvec->bv_page;
219                 if (page_has_buffers(page))
220                         gfs2_end_log_write_bh(sdp, bvec, bio->bi_status);
221                 else
222                         mempool_free(page, gfs2_page_pool);
223         }
224 
225         bio_put(bio);
226         if (atomic_dec_and_test(&sdp->sd_log_in_flight))
227                 wake_up(&sdp->sd_log_flush_wait);
228 }
229 
230 /**
231  * gfs2_log_flush_bio - Submit any pending log bio
232  * @sdp: The superblock
233  * @op: REQ_OP
234  * @op_flags: req_flag_bits
235  *
236  * Submit any pending part-built or full bio to the block device. If
237  * there is no pending bio, then this is a no-op.
238  */
239 
240 void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int op, int op_flags)
241 {
242         if (sdp->sd_log_bio) {
243                 atomic_inc(&sdp->sd_log_in_flight);
244                 bio_set_op_attrs(sdp->sd_log_bio, op, op_flags);
245                 submit_bio(sdp->sd_log_bio);
246                 sdp->sd_log_bio = NULL;
247         }
248 }
249 
250 /**
251  * gfs2_log_alloc_bio - Allocate a new bio for log writing
252  * @sdp: The superblock
253  * @blkno: The next device block number we want to write to
254  *
255  * This should never be called when there is a cached bio in the
256  * super block. When it returns, there will be a cached bio in the
257  * super block which will have as many bio_vecs as the device is
258  * happy to handle.
259  *
260  * Returns: Newly allocated bio
261  */
262 
263 static struct bio *gfs2_log_alloc_bio(struct gfs2_sbd *sdp, u64 blkno)
264 {
265         struct super_block *sb = sdp->sd_vfs;
266         struct bio *bio;
267 
268         BUG_ON(sdp->sd_log_bio);
269 
270         bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES);
271         bio->bi_iter.bi_sector = blkno * (sb->s_blocksize >> 9);
272         bio_set_dev(bio, sb->s_bdev);
273         bio->bi_end_io = gfs2_end_log_write;
274         bio->bi_private = sdp;
275 
276         sdp->sd_log_bio = bio;
277 
278         return bio;
279 }
280 
281 /**
282  * gfs2_log_get_bio - Get cached log bio, or allocate a new one
283  * @sdp: The superblock
284  * @blkno: The device block number we want to write to
285  *
286  * If there is a cached bio, then if the next block number is sequential
287  * with the previous one, return it, otherwise flush the bio to the
288  * device. If there is not a cached bio, or we just flushed it, then
289  * allocate a new one.
290  *
291  * Returns: The bio to use for log writes
292  */
293 
294 static struct bio *gfs2_log_get_bio(struct gfs2_sbd *sdp, u64 blkno)
295 {
296         struct bio *bio = sdp->sd_log_bio;
297         u64 nblk;
298 
299         if (bio) {
300                 nblk = bio_end_sector(bio);
301                 nblk >>= sdp->sd_fsb2bb_shift;
302                 if (blkno == nblk)
303                         return bio;
304                 gfs2_log_flush_bio(sdp, REQ_OP_WRITE, 0);
305         }
306 
307         return gfs2_log_alloc_bio(sdp, blkno);
308 }
309 
310 /**
311  * gfs2_log_write - write to log
312  * @sdp: the filesystem
313  * @page: the page to write
314  * @size: the size of the data to write
315  * @offset: the offset within the page 
316  * @blkno: block number of the log entry
317  *
318  * Try and add the page segment to the current bio. If that fails,
319  * submit the current bio to the device and create a new one, and
320  * then add the page segment to that.
321  */
322 
323 void gfs2_log_write(struct gfs2_sbd *sdp, struct page *page,
324                     unsigned size, unsigned offset, u64 blkno)
325 {
326         struct bio *bio;
327         int ret;
328 
329         bio = gfs2_log_get_bio(sdp, blkno);
330         ret = bio_add_page(bio, page, size, offset);
331         if (ret == 0) {
332                 gfs2_log_flush_bio(sdp, REQ_OP_WRITE, 0);
333                 bio = gfs2_log_alloc_bio(sdp, blkno);
334                 ret = bio_add_page(bio, page, size, offset);
335                 WARN_ON(ret == 0);
336         }
337 }
338 
339 /**
340  * gfs2_log_write_bh - write a buffer's content to the log
341  * @sdp: The super block
342  * @bh: The buffer pointing to the in-place location
343  * 
344  * This writes the content of the buffer to the next available location
345  * in the log. The buffer will be unlocked once the i/o to the log has
346  * completed.
347  */
348 
349 static void gfs2_log_write_bh(struct gfs2_sbd *sdp, struct buffer_head *bh)
350 {
351         gfs2_log_write(sdp, bh->b_page, bh->b_size, bh_offset(bh),
352                        gfs2_log_bmap(sdp));
353 }
354 
355 /**
356  * gfs2_log_write_page - write one block stored in a page, into the log
357  * @sdp: The superblock
358  * @page: The struct page
359  *
360  * This writes the first block-sized part of the page into the log. Note
361  * that the page must have been allocated from the gfs2_page_pool mempool
362  * and that after this has been called, ownership has been transferred and
363  * the page may be freed at any time.
364  */
365 
366 void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page)
367 {
368         struct super_block *sb = sdp->sd_vfs;
369         gfs2_log_write(sdp, page, sb->s_blocksize, 0,
370                        gfs2_log_bmap(sdp));
371 }
372 
373 static struct page *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type,
374                                       u32 ld_length, u32 ld_data1)
375 {
376         struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
377         struct gfs2_log_descriptor *ld = page_address(page);
378         clear_page(ld);
379         ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
380         ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
381         ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
382         ld->ld_type = cpu_to_be32(ld_type);
383         ld->ld_length = cpu_to_be32(ld_length);
384         ld->ld_data1 = cpu_to_be32(ld_data1);
385         ld->ld_data2 = 0;
386         return page;
387 }
388 
389 static void gfs2_check_magic(struct buffer_head *bh)
390 {
391         void *kaddr;
392         __be32 *ptr;
393 
394         clear_buffer_escaped(bh);
395         kaddr = kmap_atomic(bh->b_page);
396         ptr = kaddr + bh_offset(bh);
397         if (*ptr == cpu_to_be32(GFS2_MAGIC))
398                 set_buffer_escaped(bh);
399         kunmap_atomic(kaddr);
400 }
401 
402 static int blocknr_cmp(void *priv, struct list_head *a, struct list_head *b)
403 {
404         struct gfs2_bufdata *bda, *bdb;
405 
406         bda = list_entry(a, struct gfs2_bufdata, bd_list);
407         bdb = list_entry(b, struct gfs2_bufdata, bd_list);
408 
409         if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr)
410                 return -1;
411         if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr)
412                 return 1;
413         return 0;
414 }
415 
416 static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
417                                 unsigned int total, struct list_head *blist,
418                                 bool is_databuf)
419 {
420         struct gfs2_log_descriptor *ld;
421         struct gfs2_bufdata *bd1 = NULL, *bd2;
422         struct page *page;
423         unsigned int num;
424         unsigned n;
425         __be64 *ptr;
426 
427         gfs2_log_lock(sdp);
428         list_sort(NULL, blist, blocknr_cmp);
429         bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list);
430         while(total) {
431                 num = total;
432                 if (total > limit)
433                         num = limit;
434                 gfs2_log_unlock(sdp);
435                 page = gfs2_get_log_desc(sdp,
436                                          is_databuf ? GFS2_LOG_DESC_JDATA :
437                                          GFS2_LOG_DESC_METADATA, num + 1, num);
438                 ld = page_address(page);
439                 gfs2_log_lock(sdp);
440                 ptr = (__be64 *)(ld + 1);
441 
442                 n = 0;
443                 list_for_each_entry_continue(bd1, blist, bd_list) {
444                         *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
445                         if (is_databuf) {
446                                 gfs2_check_magic(bd1->bd_bh);
447                                 *ptr++ = cpu_to_be64(buffer_escaped(bd1->bd_bh) ? 1 : 0);
448                         }
449                         if (++n >= num)
450                                 break;
451                 }
452 
453                 gfs2_log_unlock(sdp);
454                 gfs2_log_write_page(sdp, page);
455                 gfs2_log_lock(sdp);
456 
457                 n = 0;
458                 list_for_each_entry_continue(bd2, blist, bd_list) {
459                         get_bh(bd2->bd_bh);
460                         gfs2_log_unlock(sdp);
461                         lock_buffer(bd2->bd_bh);
462 
463                         if (buffer_escaped(bd2->bd_bh)) {
464                                 void *kaddr;
465                                 page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
466                                 ptr = page_address(page);
467                                 kaddr = kmap_atomic(bd2->bd_bh->b_page);
468                                 memcpy(ptr, kaddr + bh_offset(bd2->bd_bh),
469                                        bd2->bd_bh->b_size);
470                                 kunmap_atomic(kaddr);
471                                 *(__be32 *)ptr = 0;
472                                 clear_buffer_escaped(bd2->bd_bh);
473                                 unlock_buffer(bd2->bd_bh);
474                                 brelse(bd2->bd_bh);
475                                 gfs2_log_write_page(sdp, page);
476                         } else {
477                                 gfs2_log_write_bh(sdp, bd2->bd_bh);
478                         }
479                         gfs2_log_lock(sdp);
480                         if (++n >= num)
481                                 break;
482                 }
483 
484                 BUG_ON(total < num);
485                 total -= num;
486         }
487         gfs2_log_unlock(sdp);
488 }
489 
490 static void buf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
491 {
492         unsigned int limit = buf_limit(sdp); /* 503 for 4k blocks */
493         unsigned int nbuf;
494         if (tr == NULL)
495                 return;
496         nbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm;
497         gfs2_before_commit(sdp, limit, nbuf, &tr->tr_buf, 0);
498 }
499 
500 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
501 {
502         struct list_head *head;
503         struct gfs2_bufdata *bd;
504 
505         if (tr == NULL)
506                 return;
507 
508         head = &tr->tr_buf;
509         while (!list_empty(head)) {
510                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
511                 list_del_init(&bd->bd_list);
512                 gfs2_unpin(sdp, bd->bd_bh, tr);
513         }
514 }
515 
516 static void buf_lo_before_scan(struct gfs2_jdesc *jd,
517                                struct gfs2_log_header_host *head, int pass)
518 {
519         if (pass != 0)
520                 return;
521 
522         jd->jd_found_blocks = 0;
523         jd->jd_replayed_blocks = 0;
524 }
525 
526 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
527                                 struct gfs2_log_descriptor *ld, __be64 *ptr,
528                                 int pass)
529 {
530         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
531         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
532         struct gfs2_glock *gl = ip->i_gl;
533         unsigned int blks = be32_to_cpu(ld->ld_data1);
534         struct buffer_head *bh_log, *bh_ip;
535         u64 blkno;
536         int error = 0;
537 
538         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
539                 return 0;
540 
541         gfs2_replay_incr_blk(jd, &start);
542 
543         for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
544                 blkno = be64_to_cpu(*ptr++);
545 
546                 jd->jd_found_blocks++;
547 
548                 if (gfs2_revoke_check(jd, blkno, start))
549                         continue;
550 
551                 error = gfs2_replay_read_block(jd, start, &bh_log);
552                 if (error)
553                         return error;
554 
555                 bh_ip = gfs2_meta_new(gl, blkno);
556                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
557 
558                 if (gfs2_meta_check(sdp, bh_ip))
559                         error = -EIO;
560                 else
561                         mark_buffer_dirty(bh_ip);
562 
563                 brelse(bh_log);
564                 brelse(bh_ip);
565 
566                 if (error)
567                         break;
568 
569                 jd->jd_replayed_blocks++;
570         }
571 
572         return error;
573 }
574 
575 /**
576  * gfs2_meta_sync - Sync all buffers associated with a glock
577  * @gl: The glock
578  *
579  */
580 
581 static void gfs2_meta_sync(struct gfs2_glock *gl)
582 {
583         struct address_space *mapping = gfs2_glock2aspace(gl);
584         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
585         int error;
586 
587         if (mapping == NULL)
588                 mapping = &sdp->sd_aspace;
589 
590         filemap_fdatawrite(mapping);
591         error = filemap_fdatawait(mapping);
592 
593         if (error)
594                 gfs2_io_error(gl->gl_name.ln_sbd);
595 }
596 
597 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
598 {
599         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
600         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
601 
602         if (error) {
603                 gfs2_meta_sync(ip->i_gl);
604                 return;
605         }
606         if (pass != 1)
607                 return;
608 
609         gfs2_meta_sync(ip->i_gl);
610 
611         fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
612                 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
613 }
614 
615 static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
616 {
617         struct gfs2_meta_header *mh;
618         unsigned int offset;
619         struct list_head *head = &sdp->sd_log_le_revoke;
620         struct gfs2_bufdata *bd;
621         struct page *page;
622         unsigned int length;
623 
624         gfs2_write_revokes(sdp);
625         if (!sdp->sd_log_num_revoke)
626                 return;
627 
628         length = gfs2_struct2blk(sdp, sdp->sd_log_num_revoke, sizeof(u64));
629         page = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE, length, sdp->sd_log_num_revoke);
630         offset = sizeof(struct gfs2_log_descriptor);
631 
632         list_for_each_entry(bd, head, bd_list) {
633                 sdp->sd_log_num_revoke--;
634 
635                 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
636 
637                         gfs2_log_write_page(sdp, page);
638                         page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
639                         mh = page_address(page);
640                         clear_page(mh);
641                         mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
642                         mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
643                         mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
644                         offset = sizeof(struct gfs2_meta_header);
645                 }
646 
647                 *(__be64 *)(page_address(page) + offset) = cpu_to_be64(bd->bd_blkno);
648                 offset += sizeof(u64);
649         }
650         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
651 
652         gfs2_log_write_page(sdp, page);
653 }
654 
655 static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
656 {
657         struct list_head *head = &sdp->sd_log_le_revoke;
658         struct gfs2_bufdata *bd;
659         struct gfs2_glock *gl;
660 
661         while (!list_empty(head)) {
662                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
663                 list_del_init(&bd->bd_list);
664                 gl = bd->bd_gl;
665                 atomic_dec(&gl->gl_revokes);
666                 clear_bit(GLF_LFLUSH, &gl->gl_flags);
667                 kmem_cache_free(gfs2_bufdata_cachep, bd);
668         }
669 }
670 
671 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
672                                   struct gfs2_log_header_host *head, int pass)
673 {
674         if (pass != 0)
675                 return;
676 
677         jd->jd_found_revokes = 0;
678         jd->jd_replay_tail = head->lh_tail;
679 }
680 
681 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
682                                    struct gfs2_log_descriptor *ld, __be64 *ptr,
683                                    int pass)
684 {
685         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
686         unsigned int blks = be32_to_cpu(ld->ld_length);
687         unsigned int revokes = be32_to_cpu(ld->ld_data1);
688         struct buffer_head *bh;
689         unsigned int offset;
690         u64 blkno;
691         int first = 1;
692         int error;
693 
694         if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
695                 return 0;
696 
697         offset = sizeof(struct gfs2_log_descriptor);
698 
699         for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
700                 error = gfs2_replay_read_block(jd, start, &bh);
701                 if (error)
702                         return error;
703 
704                 if (!first)
705                         gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
706 
707                 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
708                         blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
709 
710                         error = gfs2_revoke_add(jd, blkno, start);
711                         if (error < 0) {
712                                 brelse(bh);
713                                 return error;
714                         }
715                         else if (error)
716                                 jd->jd_found_revokes++;
717 
718                         if (!--revokes)
719                                 break;
720                         offset += sizeof(u64);
721                 }
722 
723                 brelse(bh);
724                 offset = sizeof(struct gfs2_meta_header);
725                 first = 0;
726         }
727 
728         return 0;
729 }
730 
731 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
732 {
733         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
734 
735         if (error) {
736                 gfs2_revoke_clean(jd);
737                 return;
738         }
739         if (pass != 1)
740                 return;
741 
742         fs_info(sdp, "jid=%u: Found %u revoke tags\n",
743                 jd->jd_jid, jd->jd_found_revokes);
744 
745         gfs2_revoke_clean(jd);
746 }
747 
748 /**
749  * databuf_lo_before_commit - Scan the data buffers, writing as we go
750  *
751  */
752 
753 static void databuf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
754 {
755         unsigned int limit = databuf_limit(sdp);
756         unsigned int nbuf;
757         if (tr == NULL)
758                 return;
759         nbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
760         gfs2_before_commit(sdp, limit, nbuf, &tr->tr_databuf, 1);
761 }
762 
763 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
764                                     struct gfs2_log_descriptor *ld,
765                                     __be64 *ptr, int pass)
766 {
767         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
768         struct gfs2_glock *gl = ip->i_gl;
769         unsigned int blks = be32_to_cpu(ld->ld_data1);
770         struct buffer_head *bh_log, *bh_ip;
771         u64 blkno;
772         u64 esc;
773         int error = 0;
774 
775         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
776                 return 0;
777 
778         gfs2_replay_incr_blk(jd, &start);
779         for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
780                 blkno = be64_to_cpu(*ptr++);
781                 esc = be64_to_cpu(*ptr++);
782 
783                 jd->jd_found_blocks++;
784 
785                 if (gfs2_revoke_check(jd, blkno, start))
786                         continue;
787 
788                 error = gfs2_replay_read_block(jd, start, &bh_log);
789                 if (error)
790                         return error;
791 
792                 bh_ip = gfs2_meta_new(gl, blkno);
793                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
794 
795                 /* Unescape */
796                 if (esc) {
797                         __be32 *eptr = (__be32 *)bh_ip->b_data;
798                         *eptr = cpu_to_be32(GFS2_MAGIC);
799                 }
800                 mark_buffer_dirty(bh_ip);
801 
802                 brelse(bh_log);
803                 brelse(bh_ip);
804 
805                 jd->jd_replayed_blocks++;
806         }
807 
808         return error;
809 }
810 
811 /* FIXME: sort out accounting for log blocks etc. */
812 
813 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
814 {
815         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
816         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
817 
818         if (error) {
819                 gfs2_meta_sync(ip->i_gl);
820                 return;
821         }
822         if (pass != 1)
823                 return;
824 
825         /* data sync? */
826         gfs2_meta_sync(ip->i_gl);
827 
828         fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
829                 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
830 }
831 
832 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
833 {
834         struct list_head *head;
835         struct gfs2_bufdata *bd;
836 
837         if (tr == NULL)
838                 return;
839 
840         head = &tr->tr_databuf;
841         while (!list_empty(head)) {
842                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
843                 list_del_init(&bd->bd_list);
844                 gfs2_unpin(sdp, bd->bd_bh, tr);
845         }
846 }
847 
848 
849 const struct gfs2_log_operations gfs2_buf_lops = {
850         .lo_before_commit = buf_lo_before_commit,
851         .lo_after_commit = buf_lo_after_commit,
852         .lo_before_scan = buf_lo_before_scan,
853         .lo_scan_elements = buf_lo_scan_elements,
854         .lo_after_scan = buf_lo_after_scan,
855         .lo_name = "buf",
856 };
857 
858 const struct gfs2_log_operations gfs2_revoke_lops = {
859         .lo_before_commit = revoke_lo_before_commit,
860         .lo_after_commit = revoke_lo_after_commit,
861         .lo_before_scan = revoke_lo_before_scan,
862         .lo_scan_elements = revoke_lo_scan_elements,
863         .lo_after_scan = revoke_lo_after_scan,
864         .lo_name = "revoke",
865 };
866 
867 const struct gfs2_log_operations gfs2_databuf_lops = {
868         .lo_before_commit = databuf_lo_before_commit,
869         .lo_after_commit = databuf_lo_after_commit,
870         .lo_scan_elements = databuf_lo_scan_elements,
871         .lo_after_scan = databuf_lo_after_scan,
872         .lo_name = "databuf",
873 };
874 
875 const struct gfs2_log_operations *gfs2_log_ops[] = {
876         &gfs2_databuf_lops,
877         &gfs2_buf_lops,
878         &gfs2_revoke_lops,
879         NULL,
880 };
881 
882 

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