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

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