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TOMOYO Linux Cross Reference
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_wd(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_bytes);
 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_submit_bio - Submit any pending log bio
232  * @biop: Address of the bio pointer
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_submit_bio(struct bio **biop, int op, int op_flags)
241 {
242         struct bio *bio = *biop;
243         if (bio) {
244                 struct gfs2_sbd *sdp = bio->bi_private;
245                 atomic_inc(&sdp->sd_log_in_flight);
246                 bio_set_op_attrs(bio, op, op_flags);
247                 submit_bio(bio);
248                 *biop = NULL;
249         }
250 }
251 
252 /**
253  * gfs2_log_alloc_bio - Allocate a bio
254  * @sdp: The super block
255  * @blkno: The device block number we want to write to
256  * @end_io: The bi_end_io callback
257  *
258  * Allocate a new bio, initialize it with the given parameters and return it.
259  *
260  * Returns: The newly allocated bio
261  */
262 
263 static struct bio *gfs2_log_alloc_bio(struct gfs2_sbd *sdp, u64 blkno,
264                                       bio_end_io_t *end_io)
265 {
266         struct super_block *sb = sdp->sd_vfs;
267         struct bio *bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES);
268 
269         bio->bi_iter.bi_sector = blkno * (sb->s_blocksize >> 9);
270         bio_set_dev(bio, sb->s_bdev);
271         bio->bi_end_io = end_io;
272         bio->bi_private = sdp;
273 
274         return bio;
275 }
276 
277 /**
278  * gfs2_log_get_bio - Get cached log bio, or allocate a new one
279  * @sdp: The super block
280  * @blkno: The device block number we want to write to
281  * @bio: The bio to get or allocate
282  * @op: REQ_OP
283  * @end_io: The bi_end_io callback
284  * @flush: Always flush the current bio and allocate a new one?
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 no 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                                     struct bio **biop, int op,
296                                     bio_end_io_t *end_io, bool flush)
297 {
298         struct bio *bio = *biop;
299 
300         if (bio) {
301                 u64 nblk;
302 
303                 nblk = bio_end_sector(bio);
304                 nblk >>= sdp->sd_fsb2bb_shift;
305                 if (blkno == nblk && !flush)
306                         return bio;
307                 gfs2_log_submit_bio(biop, op, 0);
308         }
309 
310         *biop = gfs2_log_alloc_bio(sdp, blkno, end_io);
311         return *biop;
312 }
313 
314 /**
315  * gfs2_log_write - write to log
316  * @sdp: the filesystem
317  * @page: the page to write
318  * @size: the size of the data to write
319  * @offset: the offset within the page 
320  * @blkno: block number of the log entry
321  *
322  * Try and add the page segment to the current bio. If that fails,
323  * submit the current bio to the device and create a new one, and
324  * then add the page segment to that.
325  */
326 
327 void gfs2_log_write(struct gfs2_sbd *sdp, struct page *page,
328                     unsigned size, unsigned offset, u64 blkno)
329 {
330         struct bio *bio;
331         int ret;
332 
333         bio = gfs2_log_get_bio(sdp, blkno, &sdp->sd_log_bio, REQ_OP_WRITE,
334                                gfs2_end_log_write, false);
335         ret = bio_add_page(bio, page, size, offset);
336         if (ret == 0) {
337                 bio = gfs2_log_get_bio(sdp, blkno, &sdp->sd_log_bio,
338                                        REQ_OP_WRITE, gfs2_end_log_write, true);
339                 ret = bio_add_page(bio, page, size, offset);
340                 WARN_ON(ret == 0);
341         }
342 }
343 
344 /**
345  * gfs2_log_write_bh - write a buffer's content to the log
346  * @sdp: The super block
347  * @bh: The buffer pointing to the in-place location
348  * 
349  * This writes the content of the buffer to the next available location
350  * in the log. The buffer will be unlocked once the i/o to the log has
351  * completed.
352  */
353 
354 static void gfs2_log_write_bh(struct gfs2_sbd *sdp, struct buffer_head *bh)
355 {
356         gfs2_log_write(sdp, bh->b_page, bh->b_size, bh_offset(bh),
357                        gfs2_log_bmap(sdp));
358 }
359 
360 /**
361  * gfs2_log_write_page - write one block stored in a page, into the log
362  * @sdp: The superblock
363  * @page: The struct page
364  *
365  * This writes the first block-sized part of the page into the log. Note
366  * that the page must have been allocated from the gfs2_page_pool mempool
367  * and that after this has been called, ownership has been transferred and
368  * the page may be freed at any time.
369  */
370 
371 void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page)
372 {
373         struct super_block *sb = sdp->sd_vfs;
374         gfs2_log_write(sdp, page, sb->s_blocksize, 0,
375                        gfs2_log_bmap(sdp));
376 }
377 
378 static struct page *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type,
379                                       u32 ld_length, u32 ld_data1)
380 {
381         struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
382         struct gfs2_log_descriptor *ld = page_address(page);
383         clear_page(ld);
384         ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
385         ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
386         ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
387         ld->ld_type = cpu_to_be32(ld_type);
388         ld->ld_length = cpu_to_be32(ld_length);
389         ld->ld_data1 = cpu_to_be32(ld_data1);
390         ld->ld_data2 = 0;
391         return page;
392 }
393 
394 static void gfs2_check_magic(struct buffer_head *bh)
395 {
396         void *kaddr;
397         __be32 *ptr;
398 
399         clear_buffer_escaped(bh);
400         kaddr = kmap_atomic(bh->b_page);
401         ptr = kaddr + bh_offset(bh);
402         if (*ptr == cpu_to_be32(GFS2_MAGIC))
403                 set_buffer_escaped(bh);
404         kunmap_atomic(kaddr);
405 }
406 
407 static int blocknr_cmp(void *priv, struct list_head *a, struct list_head *b)
408 {
409         struct gfs2_bufdata *bda, *bdb;
410 
411         bda = list_entry(a, struct gfs2_bufdata, bd_list);
412         bdb = list_entry(b, struct gfs2_bufdata, bd_list);
413 
414         if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr)
415                 return -1;
416         if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr)
417                 return 1;
418         return 0;
419 }
420 
421 static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
422                                 unsigned int total, struct list_head *blist,
423                                 bool is_databuf)
424 {
425         struct gfs2_log_descriptor *ld;
426         struct gfs2_bufdata *bd1 = NULL, *bd2;
427         struct page *page;
428         unsigned int num;
429         unsigned n;
430         __be64 *ptr;
431 
432         gfs2_log_lock(sdp);
433         list_sort(NULL, blist, blocknr_cmp);
434         bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list);
435         while(total) {
436                 num = total;
437                 if (total > limit)
438                         num = limit;
439                 gfs2_log_unlock(sdp);
440                 page = gfs2_get_log_desc(sdp,
441                                          is_databuf ? GFS2_LOG_DESC_JDATA :
442                                          GFS2_LOG_DESC_METADATA, num + 1, num);
443                 ld = page_address(page);
444                 gfs2_log_lock(sdp);
445                 ptr = (__be64 *)(ld + 1);
446 
447                 n = 0;
448                 list_for_each_entry_continue(bd1, blist, bd_list) {
449                         *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
450                         if (is_databuf) {
451                                 gfs2_check_magic(bd1->bd_bh);
452                                 *ptr++ = cpu_to_be64(buffer_escaped(bd1->bd_bh) ? 1 : 0);
453                         }
454                         if (++n >= num)
455                                 break;
456                 }
457 
458                 gfs2_log_unlock(sdp);
459                 gfs2_log_write_page(sdp, page);
460                 gfs2_log_lock(sdp);
461 
462                 n = 0;
463                 list_for_each_entry_continue(bd2, blist, bd_list) {
464                         get_bh(bd2->bd_bh);
465                         gfs2_log_unlock(sdp);
466                         lock_buffer(bd2->bd_bh);
467 
468                         if (buffer_escaped(bd2->bd_bh)) {
469                                 void *kaddr;
470                                 page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
471                                 ptr = page_address(page);
472                                 kaddr = kmap_atomic(bd2->bd_bh->b_page);
473                                 memcpy(ptr, kaddr + bh_offset(bd2->bd_bh),
474                                        bd2->bd_bh->b_size);
475                                 kunmap_atomic(kaddr);
476                                 *(__be32 *)ptr = 0;
477                                 clear_buffer_escaped(bd2->bd_bh);
478                                 unlock_buffer(bd2->bd_bh);
479                                 brelse(bd2->bd_bh);
480                                 gfs2_log_write_page(sdp, page);
481                         } else {
482                                 gfs2_log_write_bh(sdp, bd2->bd_bh);
483                         }
484                         gfs2_log_lock(sdp);
485                         if (++n >= num)
486                                 break;
487                 }
488 
489                 BUG_ON(total < num);
490                 total -= num;
491         }
492         gfs2_log_unlock(sdp);
493 }
494 
495 static void buf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
496 {
497         unsigned int limit = buf_limit(sdp); /* 503 for 4k blocks */
498         unsigned int nbuf;
499         if (tr == NULL)
500                 return;
501         nbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm;
502         gfs2_before_commit(sdp, limit, nbuf, &tr->tr_buf, 0);
503 }
504 
505 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
506 {
507         struct list_head *head;
508         struct gfs2_bufdata *bd;
509 
510         if (tr == NULL)
511                 return;
512 
513         head = &tr->tr_buf;
514         while (!list_empty(head)) {
515                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
516                 list_del_init(&bd->bd_list);
517                 gfs2_unpin(sdp, bd->bd_bh, tr);
518         }
519 }
520 
521 static void buf_lo_before_scan(struct gfs2_jdesc *jd,
522                                struct gfs2_log_header_host *head, int pass)
523 {
524         if (pass != 0)
525                 return;
526 
527         jd->jd_found_blocks = 0;
528         jd->jd_replayed_blocks = 0;
529 }
530 
531 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
532                                 struct gfs2_log_descriptor *ld, __be64 *ptr,
533                                 int pass)
534 {
535         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
536         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
537         struct gfs2_glock *gl = ip->i_gl;
538         unsigned int blks = be32_to_cpu(ld->ld_data1);
539         struct buffer_head *bh_log, *bh_ip;
540         u64 blkno;
541         int error = 0;
542 
543         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
544                 return 0;
545 
546         gfs2_replay_incr_blk(jd, &start);
547 
548         for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
549                 blkno = be64_to_cpu(*ptr++);
550 
551                 jd->jd_found_blocks++;
552 
553                 if (gfs2_revoke_check(jd, blkno, start))
554                         continue;
555 
556                 error = gfs2_replay_read_block(jd, start, &bh_log);
557                 if (error)
558                         return error;
559 
560                 bh_ip = gfs2_meta_new(gl, blkno);
561                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
562 
563                 if (gfs2_meta_check(sdp, bh_ip))
564                         error = -EIO;
565                 else
566                         mark_buffer_dirty(bh_ip);
567 
568                 brelse(bh_log);
569                 brelse(bh_ip);
570 
571                 if (error)
572                         break;
573 
574                 jd->jd_replayed_blocks++;
575         }
576 
577         return error;
578 }
579 
580 /**
581  * gfs2_meta_sync - Sync all buffers associated with a glock
582  * @gl: The glock
583  *
584  */
585 
586 static void gfs2_meta_sync(struct gfs2_glock *gl)
587 {
588         struct address_space *mapping = gfs2_glock2aspace(gl);
589         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
590         int error;
591 
592         if (mapping == NULL)
593                 mapping = &sdp->sd_aspace;
594 
595         filemap_fdatawrite(mapping);
596         error = filemap_fdatawait(mapping);
597 
598         if (error)
599                 gfs2_io_error(gl->gl_name.ln_sbd);
600 }
601 
602 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
603 {
604         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
605         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
606 
607         if (error) {
608                 gfs2_meta_sync(ip->i_gl);
609                 return;
610         }
611         if (pass != 1)
612                 return;
613 
614         gfs2_meta_sync(ip->i_gl);
615 
616         fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
617                 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
618 }
619 
620 static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
621 {
622         struct gfs2_meta_header *mh;
623         unsigned int offset;
624         struct list_head *head = &sdp->sd_log_le_revoke;
625         struct gfs2_bufdata *bd;
626         struct page *page;
627         unsigned int length;
628 
629         gfs2_write_revokes(sdp);
630         if (!sdp->sd_log_num_revoke)
631                 return;
632 
633         length = gfs2_struct2blk(sdp, sdp->sd_log_num_revoke, sizeof(u64));
634         page = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE, length, sdp->sd_log_num_revoke);
635         offset = sizeof(struct gfs2_log_descriptor);
636 
637         list_for_each_entry(bd, head, bd_list) {
638                 sdp->sd_log_num_revoke--;
639 
640                 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
641 
642                         gfs2_log_write_page(sdp, page);
643                         page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
644                         mh = page_address(page);
645                         clear_page(mh);
646                         mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
647                         mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
648                         mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
649                         offset = sizeof(struct gfs2_meta_header);
650                 }
651 
652                 *(__be64 *)(page_address(page) + offset) = cpu_to_be64(bd->bd_blkno);
653                 offset += sizeof(u64);
654         }
655         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
656 
657         gfs2_log_write_page(sdp, page);
658 }
659 
660 static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
661 {
662         struct list_head *head = &sdp->sd_log_le_revoke;
663         struct gfs2_bufdata *bd;
664         struct gfs2_glock *gl;
665 
666         while (!list_empty(head)) {
667                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
668                 list_del_init(&bd->bd_list);
669                 gl = bd->bd_gl;
670                 if (atomic_dec_return(&gl->gl_revokes) == 0) {
671                         clear_bit(GLF_LFLUSH, &gl->gl_flags);
672                         gfs2_glock_queue_put(gl);
673                 }
674                 kmem_cache_free(gfs2_bufdata_cachep, bd);
675         }
676 }
677 
678 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
679                                   struct gfs2_log_header_host *head, int pass)
680 {
681         if (pass != 0)
682                 return;
683 
684         jd->jd_found_revokes = 0;
685         jd->jd_replay_tail = head->lh_tail;
686 }
687 
688 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
689                                    struct gfs2_log_descriptor *ld, __be64 *ptr,
690                                    int pass)
691 {
692         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
693         unsigned int blks = be32_to_cpu(ld->ld_length);
694         unsigned int revokes = be32_to_cpu(ld->ld_data1);
695         struct buffer_head *bh;
696         unsigned int offset;
697         u64 blkno;
698         int first = 1;
699         int error;
700 
701         if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
702                 return 0;
703 
704         offset = sizeof(struct gfs2_log_descriptor);
705 
706         for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
707                 error = gfs2_replay_read_block(jd, start, &bh);
708                 if (error)
709                         return error;
710 
711                 if (!first)
712                         gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
713 
714                 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
715                         blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
716 
717                         error = gfs2_revoke_add(jd, blkno, start);
718                         if (error < 0) {
719                                 brelse(bh);
720                                 return error;
721                         }
722                         else if (error)
723                                 jd->jd_found_revokes++;
724 
725                         if (!--revokes)
726                                 break;
727                         offset += sizeof(u64);
728                 }
729 
730                 brelse(bh);
731                 offset = sizeof(struct gfs2_meta_header);
732                 first = 0;
733         }
734 
735         return 0;
736 }
737 
738 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
739 {
740         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
741 
742         if (error) {
743                 gfs2_revoke_clean(jd);
744                 return;
745         }
746         if (pass != 1)
747                 return;
748 
749         fs_info(sdp, "jid=%u: Found %u revoke tags\n",
750                 jd->jd_jid, jd->jd_found_revokes);
751 
752         gfs2_revoke_clean(jd);
753 }
754 
755 /**
756  * databuf_lo_before_commit - Scan the data buffers, writing as we go
757  *
758  */
759 
760 static void databuf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
761 {
762         unsigned int limit = databuf_limit(sdp);
763         unsigned int nbuf;
764         if (tr == NULL)
765                 return;
766         nbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
767         gfs2_before_commit(sdp, limit, nbuf, &tr->tr_databuf, 1);
768 }
769 
770 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
771                                     struct gfs2_log_descriptor *ld,
772                                     __be64 *ptr, int pass)
773 {
774         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
775         struct gfs2_glock *gl = ip->i_gl;
776         unsigned int blks = be32_to_cpu(ld->ld_data1);
777         struct buffer_head *bh_log, *bh_ip;
778         u64 blkno;
779         u64 esc;
780         int error = 0;
781 
782         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
783                 return 0;
784 
785         gfs2_replay_incr_blk(jd, &start);
786         for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
787                 blkno = be64_to_cpu(*ptr++);
788                 esc = be64_to_cpu(*ptr++);
789 
790                 jd->jd_found_blocks++;
791 
792                 if (gfs2_revoke_check(jd, blkno, start))
793                         continue;
794 
795                 error = gfs2_replay_read_block(jd, start, &bh_log);
796                 if (error)
797                         return error;
798 
799                 bh_ip = gfs2_meta_new(gl, blkno);
800                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
801 
802                 /* Unescape */
803                 if (esc) {
804                         __be32 *eptr = (__be32 *)bh_ip->b_data;
805                         *eptr = cpu_to_be32(GFS2_MAGIC);
806                 }
807                 mark_buffer_dirty(bh_ip);
808 
809                 brelse(bh_log);
810                 brelse(bh_ip);
811 
812                 jd->jd_replayed_blocks++;
813         }
814 
815         return error;
816 }
817 
818 /* FIXME: sort out accounting for log blocks etc. */
819 
820 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
821 {
822         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
823         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
824 
825         if (error) {
826                 gfs2_meta_sync(ip->i_gl);
827                 return;
828         }
829         if (pass != 1)
830                 return;
831 
832         /* data sync? */
833         gfs2_meta_sync(ip->i_gl);
834 
835         fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
836                 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
837 }
838 
839 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
840 {
841         struct list_head *head;
842         struct gfs2_bufdata *bd;
843 
844         if (tr == NULL)
845                 return;
846 
847         head = &tr->tr_databuf;
848         while (!list_empty(head)) {
849                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
850                 list_del_init(&bd->bd_list);
851                 gfs2_unpin(sdp, bd->bd_bh, tr);
852         }
853 }
854 
855 
856 const struct gfs2_log_operations gfs2_buf_lops = {
857         .lo_before_commit = buf_lo_before_commit,
858         .lo_after_commit = buf_lo_after_commit,
859         .lo_before_scan = buf_lo_before_scan,
860         .lo_scan_elements = buf_lo_scan_elements,
861         .lo_after_scan = buf_lo_after_scan,
862         .lo_name = "buf",
863 };
864 
865 const struct gfs2_log_operations gfs2_revoke_lops = {
866         .lo_before_commit = revoke_lo_before_commit,
867         .lo_after_commit = revoke_lo_after_commit,
868         .lo_before_scan = revoke_lo_before_scan,
869         .lo_scan_elements = revoke_lo_scan_elements,
870         .lo_after_scan = revoke_lo_after_scan,
871         .lo_name = "revoke",
872 };
873 
874 const struct gfs2_log_operations gfs2_databuf_lops = {
875         .lo_before_commit = databuf_lo_before_commit,
876         .lo_after_commit = databuf_lo_after_commit,
877         .lo_scan_elements = databuf_lo_scan_elements,
878         .lo_after_scan = databuf_lo_after_scan,
879         .lo_name = "databuf",
880 };
881 
882 const struct gfs2_log_operations *gfs2_log_ops[] = {
883         &gfs2_databuf_lops,
884         &gfs2_buf_lops,
885         &gfs2_revoke_lops,
886         NULL,
887 };
888 
889 

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