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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 "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_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, int error)
206 {
207         struct gfs2_sbd *sdp = bio->bi_private;
208         struct bio_vec *bvec;
209         struct page *page;
210         int i;
211 
212         if (error) {
213                 sdp->sd_log_error = error;
214                 fs_err(sdp, "Error %d writing to log\n", 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, 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  * @rw: The rw flags
234  *
235  * Submit any pending part-built or full bio to the block device. If
236  * there is no pending bio, then this is a no-op.
237  */
238 
239 void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int rw)
240 {
241         if (sdp->sd_log_bio) {
242                 atomic_inc(&sdp->sd_log_in_flight);
243                 submit_bio(rw, sdp->sd_log_bio);
244                 sdp->sd_log_bio = NULL;
245         }
246 }
247 
248 /**
249  * gfs2_log_alloc_bio - Allocate a new bio for log writing
250  * @sdp: The superblock
251  * @blkno: The next device block number we want to write to
252  *
253  * This should never be called when there is a cached bio in the
254  * super block. When it returns, there will be a cached bio in the
255  * super block which will have as many bio_vecs as the device is
256  * happy to handle.
257  *
258  * Returns: Newly allocated bio
259  */
260 
261 static struct bio *gfs2_log_alloc_bio(struct gfs2_sbd *sdp, u64 blkno)
262 {
263         struct super_block *sb = sdp->sd_vfs;
264         unsigned nrvecs = bio_get_nr_vecs(sb->s_bdev);
265         struct bio *bio;
266 
267         BUG_ON(sdp->sd_log_bio);
268 
269         while (1) {
270                 bio = bio_alloc(GFP_NOIO, nrvecs);
271                 if (likely(bio))
272                         break;
273                 nrvecs = max(nrvecs/2, 1U);
274         }
275 
276         bio->bi_iter.bi_sector = blkno * (sb->s_blocksize >> 9);
277         bio->bi_bdev = sb->s_bdev;
278         bio->bi_end_io = gfs2_end_log_write;
279         bio->bi_private = sdp;
280 
281         sdp->sd_log_bio = bio;
282 
283         return bio;
284 }
285 
286 /**
287  * gfs2_log_get_bio - Get cached log bio, or allocate a new one
288  * @sdp: The superblock
289  * @blkno: The device block number we want to write to
290  *
291  * If there is a cached bio, then if the next block number is sequential
292  * with the previous one, return it, otherwise flush the bio to the
293  * device. If there is not a cached bio, or we just flushed it, then
294  * allocate a new one.
295  *
296  * Returns: The bio to use for log writes
297  */
298 
299 static struct bio *gfs2_log_get_bio(struct gfs2_sbd *sdp, u64 blkno)
300 {
301         struct bio *bio = sdp->sd_log_bio;
302         u64 nblk;
303 
304         if (bio) {
305                 nblk = bio_end_sector(bio);
306                 nblk >>= sdp->sd_fsb2bb_shift;
307                 if (blkno == nblk)
308                         return bio;
309                 gfs2_log_flush_bio(sdp, WRITE);
310         }
311 
312         return gfs2_log_alloc_bio(sdp, blkno);
313 }
314 
315 
316 /**
317  * gfs2_log_write - write to log
318  * @sdp: the filesystem
319  * @page: the page to write
320  * @size: the size of the data to write
321  * @offset: the offset within the page 
322  *
323  * Try and add the page segment to the current bio. If that fails,
324  * submit the current bio to the device and create a new one, and
325  * then add the page segment to that.
326  */
327 
328 static void gfs2_log_write(struct gfs2_sbd *sdp, struct page *page,
329                            unsigned size, unsigned offset)
330 {
331         u64 blkno = gfs2_log_bmap(sdp);
332         struct bio *bio;
333         int ret;
334 
335         bio = gfs2_log_get_bio(sdp, blkno);
336         ret = bio_add_page(bio, page, size, offset);
337         if (ret == 0) {
338                 gfs2_log_flush_bio(sdp, WRITE);
339                 bio = gfs2_log_alloc_bio(sdp, blkno);
340                 ret = bio_add_page(bio, page, size, offset);
341                 WARN_ON(ret == 0);
342         }
343 }
344 
345 /**
346  * gfs2_log_write_bh - write a buffer's content to the log
347  * @sdp: The super block
348  * @bh: The buffer pointing to the in-place location
349  * 
350  * This writes the content of the buffer to the next available location
351  * in the log. The buffer will be unlocked once the i/o to the log has
352  * completed.
353  */
354 
355 static void gfs2_log_write_bh(struct gfs2_sbd *sdp, struct buffer_head *bh)
356 {
357         gfs2_log_write(sdp, bh->b_page, bh->b_size, bh_offset(bh));
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 }
376 
377 static struct page *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type,
378                                       u32 ld_length, u32 ld_data1)
379 {
380         struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
381         struct gfs2_log_descriptor *ld = page_address(page);
382         clear_page(ld);
383         ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
384         ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
385         ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
386         ld->ld_type = cpu_to_be32(ld_type);
387         ld->ld_length = cpu_to_be32(ld_length);
388         ld->ld_data1 = cpu_to_be32(ld_data1);
389         ld->ld_data2 = 0;
390         return page;
391 }
392 
393 static void gfs2_check_magic(struct buffer_head *bh)
394 {
395         void *kaddr;
396         __be32 *ptr;
397 
398         clear_buffer_escaped(bh);
399         kaddr = kmap_atomic(bh->b_page);
400         ptr = kaddr + bh_offset(bh);
401         if (*ptr == cpu_to_be32(GFS2_MAGIC))
402                 set_buffer_escaped(bh);
403         kunmap_atomic(kaddr);
404 }
405 
406 static int blocknr_cmp(void *priv, struct list_head *a, struct list_head *b)
407 {
408         struct gfs2_bufdata *bda, *bdb;
409 
410         bda = list_entry(a, struct gfs2_bufdata, bd_list);
411         bdb = list_entry(b, struct gfs2_bufdata, bd_list);
412 
413         if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr)
414                 return -1;
415         if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr)
416                 return 1;
417         return 0;
418 }
419 
420 static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
421                                 unsigned int total, struct list_head *blist,
422                                 bool is_databuf)
423 {
424         struct gfs2_log_descriptor *ld;
425         struct gfs2_bufdata *bd1 = NULL, *bd2;
426         struct page *page;
427         unsigned int num;
428         unsigned n;
429         __be64 *ptr;
430 
431         gfs2_log_lock(sdp);
432         list_sort(NULL, blist, blocknr_cmp);
433         bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list);
434         while(total) {
435                 num = total;
436                 if (total > limit)
437                         num = limit;
438                 gfs2_log_unlock(sdp);
439                 page = gfs2_get_log_desc(sdp,
440                                          is_databuf ? GFS2_LOG_DESC_JDATA :
441                                          GFS2_LOG_DESC_METADATA, num + 1, num);
442                 ld = page_address(page);
443                 gfs2_log_lock(sdp);
444                 ptr = (__be64 *)(ld + 1);
445 
446                 n = 0;
447                 list_for_each_entry_continue(bd1, blist, bd_list) {
448                         *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
449                         if (is_databuf) {
450                                 gfs2_check_magic(bd1->bd_bh);
451                                 *ptr++ = cpu_to_be64(buffer_escaped(bd1->bd_bh) ? 1 : 0);
452                         }
453                         if (++n >= num)
454                                 break;
455                 }
456 
457                 gfs2_log_unlock(sdp);
458                 gfs2_log_write_page(sdp, page);
459                 gfs2_log_lock(sdp);
460 
461                 n = 0;
462                 list_for_each_entry_continue(bd2, blist, bd_list) {
463                         get_bh(bd2->bd_bh);
464                         gfs2_log_unlock(sdp);
465                         lock_buffer(bd2->bd_bh);
466 
467                         if (buffer_escaped(bd2->bd_bh)) {
468                                 void *kaddr;
469                                 page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
470                                 ptr = page_address(page);
471                                 kaddr = kmap_atomic(bd2->bd_bh->b_page);
472                                 memcpy(ptr, kaddr + bh_offset(bd2->bd_bh),
473                                        bd2->bd_bh->b_size);
474                                 kunmap_atomic(kaddr);
475                                 *(__be32 *)ptr = 0;
476                                 clear_buffer_escaped(bd2->bd_bh);
477                                 unlock_buffer(bd2->bd_bh);
478                                 brelse(bd2->bd_bh);
479                                 gfs2_log_write_page(sdp, page);
480                         } else {
481                                 gfs2_log_write_bh(sdp, bd2->bd_bh);
482                         }
483                         gfs2_log_lock(sdp);
484                         if (++n >= num)
485                                 break;
486                 }
487 
488                 BUG_ON(total < num);
489                 total -= num;
490         }
491         gfs2_log_unlock(sdp);
492 }
493 
494 static void buf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
495 {
496         unsigned int limit = buf_limit(sdp); /* 503 for 4k blocks */
497         unsigned int nbuf;
498         if (tr == NULL)
499                 return;
500         nbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm;
501         gfs2_before_commit(sdp, limit, nbuf, &tr->tr_buf, 0);
502 }
503 
504 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
505 {
506         struct list_head *head;
507         struct gfs2_bufdata *bd;
508 
509         if (tr == NULL)
510                 return;
511 
512         head = &tr->tr_buf;
513         while (!list_empty(head)) {
514                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
515                 list_del_init(&bd->bd_list);
516                 gfs2_unpin(sdp, bd->bd_bh, tr);
517         }
518 }
519 
520 static void buf_lo_before_scan(struct gfs2_jdesc *jd,
521                                struct gfs2_log_header_host *head, int pass)
522 {
523         if (pass != 0)
524                 return;
525 
526         jd->jd_found_blocks = 0;
527         jd->jd_replayed_blocks = 0;
528 }
529 
530 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
531                                 struct gfs2_log_descriptor *ld, __be64 *ptr,
532                                 int pass)
533 {
534         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
535         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
536         struct gfs2_glock *gl = ip->i_gl;
537         unsigned int blks = be32_to_cpu(ld->ld_data1);
538         struct buffer_head *bh_log, *bh_ip;
539         u64 blkno;
540         int error = 0;
541 
542         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
543                 return 0;
544 
545         gfs2_replay_incr_blk(sdp, &start);
546 
547         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
548                 blkno = be64_to_cpu(*ptr++);
549 
550                 jd->jd_found_blocks++;
551 
552                 if (gfs2_revoke_check(jd, blkno, start))
553                         continue;
554 
555                 error = gfs2_replay_read_block(jd, start, &bh_log);
556                 if (error)
557                         return error;
558 
559                 bh_ip = gfs2_meta_new(gl, blkno);
560                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
561 
562                 if (gfs2_meta_check(sdp, bh_ip))
563                         error = -EIO;
564                 else
565                         mark_buffer_dirty(bh_ip);
566 
567                 brelse(bh_log);
568                 brelse(bh_ip);
569 
570                 if (error)
571                         break;
572 
573                 jd->jd_replayed_blocks++;
574         }
575 
576         return error;
577 }
578 
579 /**
580  * gfs2_meta_sync - Sync all buffers associated with a glock
581  * @gl: The glock
582  *
583  */
584 
585 static void gfs2_meta_sync(struct gfs2_glock *gl)
586 {
587         struct address_space *mapping = gfs2_glock2aspace(gl);
588         struct gfs2_sbd *sdp = gl->gl_sbd;
589         int error;
590 
591         if (mapping == NULL)
592                 mapping = &sdp->sd_aspace;
593 
594         filemap_fdatawrite(mapping);
595         error = filemap_fdatawait(mapping);
596 
597         if (error)
598                 gfs2_io_error(gl->gl_sbd);
599 }
600 
601 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
602 {
603         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
604         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
605 
606         if (error) {
607                 gfs2_meta_sync(ip->i_gl);
608                 return;
609         }
610         if (pass != 1)
611                 return;
612 
613         gfs2_meta_sync(ip->i_gl);
614 
615         fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
616                 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
617 }
618 
619 static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
620 {
621         struct gfs2_meta_header *mh;
622         unsigned int offset;
623         struct list_head *head = &sdp->sd_log_le_revoke;
624         struct gfs2_bufdata *bd;
625         struct page *page;
626         unsigned int length;
627 
628         gfs2_write_revokes(sdp);
629         if (!sdp->sd_log_num_revoke)
630                 return;
631 
632         length = gfs2_struct2blk(sdp, sdp->sd_log_num_revoke, sizeof(u64));
633         page = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE, length, sdp->sd_log_num_revoke);
634         offset = sizeof(struct gfs2_log_descriptor);
635 
636         list_for_each_entry(bd, head, bd_list) {
637                 sdp->sd_log_num_revoke--;
638 
639                 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
640 
641                         gfs2_log_write_page(sdp, page);
642                         page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
643                         mh = page_address(page);
644                         clear_page(mh);
645                         mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
646                         mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
647                         mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
648                         offset = sizeof(struct gfs2_meta_header);
649                 }
650 
651                 *(__be64 *)(page_address(page) + offset) = cpu_to_be64(bd->bd_blkno);
652                 offset += sizeof(u64);
653         }
654         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
655 
656         gfs2_log_write_page(sdp, page);
657 }
658 
659 static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
660 {
661         struct list_head *head = &sdp->sd_log_le_revoke;
662         struct gfs2_bufdata *bd;
663         struct gfs2_glock *gl;
664 
665         while (!list_empty(head)) {
666                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
667                 list_del_init(&bd->bd_list);
668                 gl = bd->bd_gl;
669                 atomic_dec(&gl->gl_revokes);
670                 clear_bit(GLF_LFLUSH, &gl->gl_flags);
671                 kmem_cache_free(gfs2_bufdata_cachep, bd);
672         }
673 }
674 
675 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
676                                   struct gfs2_log_header_host *head, int pass)
677 {
678         if (pass != 0)
679                 return;
680 
681         jd->jd_found_revokes = 0;
682         jd->jd_replay_tail = head->lh_tail;
683 }
684 
685 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
686                                    struct gfs2_log_descriptor *ld, __be64 *ptr,
687                                    int pass)
688 {
689         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
690         unsigned int blks = be32_to_cpu(ld->ld_length);
691         unsigned int revokes = be32_to_cpu(ld->ld_data1);
692         struct buffer_head *bh;
693         unsigned int offset;
694         u64 blkno;
695         int first = 1;
696         int error;
697 
698         if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
699                 return 0;
700 
701         offset = sizeof(struct gfs2_log_descriptor);
702 
703         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
704                 error = gfs2_replay_read_block(jd, start, &bh);
705                 if (error)
706                         return error;
707 
708                 if (!first)
709                         gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
710 
711                 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
712                         blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
713 
714                         error = gfs2_revoke_add(jd, blkno, start);
715                         if (error < 0) {
716                                 brelse(bh);
717                                 return error;
718                         }
719                         else if (error)
720                                 jd->jd_found_revokes++;
721 
722                         if (!--revokes)
723                                 break;
724                         offset += sizeof(u64);
725                 }
726 
727                 brelse(bh);
728                 offset = sizeof(struct gfs2_meta_header);
729                 first = 0;
730         }
731 
732         return 0;
733 }
734 
735 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
736 {
737         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
738 
739         if (error) {
740                 gfs2_revoke_clean(jd);
741                 return;
742         }
743         if (pass != 1)
744                 return;
745 
746         fs_info(sdp, "jid=%u: Found %u revoke tags\n",
747                 jd->jd_jid, jd->jd_found_revokes);
748 
749         gfs2_revoke_clean(jd);
750 }
751 
752 /**
753  * databuf_lo_before_commit - Scan the data buffers, writing as we go
754  *
755  */
756 
757 static void databuf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
758 {
759         unsigned int limit = databuf_limit(sdp);
760         unsigned int nbuf;
761         if (tr == NULL)
762                 return;
763         nbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
764         gfs2_before_commit(sdp, limit, nbuf, &tr->tr_databuf, 1);
765 }
766 
767 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
768                                     struct gfs2_log_descriptor *ld,
769                                     __be64 *ptr, int pass)
770 {
771         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
772         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
773         struct gfs2_glock *gl = ip->i_gl;
774         unsigned int blks = be32_to_cpu(ld->ld_data1);
775         struct buffer_head *bh_log, *bh_ip;
776         u64 blkno;
777         u64 esc;
778         int error = 0;
779 
780         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
781                 return 0;
782 
783         gfs2_replay_incr_blk(sdp, &start);
784         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
785                 blkno = be64_to_cpu(*ptr++);
786                 esc = be64_to_cpu(*ptr++);
787 
788                 jd->jd_found_blocks++;
789 
790                 if (gfs2_revoke_check(jd, blkno, start))
791                         continue;
792 
793                 error = gfs2_replay_read_block(jd, start, &bh_log);
794                 if (error)
795                         return error;
796 
797                 bh_ip = gfs2_meta_new(gl, blkno);
798                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
799 
800                 /* Unescape */
801                 if (esc) {
802                         __be32 *eptr = (__be32 *)bh_ip->b_data;
803                         *eptr = cpu_to_be32(GFS2_MAGIC);
804                 }
805                 mark_buffer_dirty(bh_ip);
806 
807                 brelse(bh_log);
808                 brelse(bh_ip);
809 
810                 jd->jd_replayed_blocks++;
811         }
812 
813         return error;
814 }
815 
816 /* FIXME: sort out accounting for log blocks etc. */
817 
818 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
819 {
820         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
821         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
822 
823         if (error) {
824                 gfs2_meta_sync(ip->i_gl);
825                 return;
826         }
827         if (pass != 1)
828                 return;
829 
830         /* data sync? */
831         gfs2_meta_sync(ip->i_gl);
832 
833         fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
834                 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
835 }
836 
837 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
838 {
839         struct list_head *head;
840         struct gfs2_bufdata *bd;
841 
842         if (tr == NULL)
843                 return;
844 
845         head = &tr->tr_databuf;
846         while (!list_empty(head)) {
847                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
848                 list_del_init(&bd->bd_list);
849                 gfs2_unpin(sdp, bd->bd_bh, tr);
850         }
851 }
852 
853 
854 const struct gfs2_log_operations gfs2_buf_lops = {
855         .lo_before_commit = buf_lo_before_commit,
856         .lo_after_commit = buf_lo_after_commit,
857         .lo_before_scan = buf_lo_before_scan,
858         .lo_scan_elements = buf_lo_scan_elements,
859         .lo_after_scan = buf_lo_after_scan,
860         .lo_name = "buf",
861 };
862 
863 const struct gfs2_log_operations gfs2_revoke_lops = {
864         .lo_before_commit = revoke_lo_before_commit,
865         .lo_after_commit = revoke_lo_after_commit,
866         .lo_before_scan = revoke_lo_before_scan,
867         .lo_scan_elements = revoke_lo_scan_elements,
868         .lo_after_scan = revoke_lo_after_scan,
869         .lo_name = "revoke",
870 };
871 
872 const struct gfs2_log_operations gfs2_databuf_lops = {
873         .lo_before_commit = databuf_lo_before_commit,
874         .lo_after_commit = databuf_lo_after_commit,
875         .lo_scan_elements = databuf_lo_scan_elements,
876         .lo_after_scan = databuf_lo_after_scan,
877         .lo_name = "databuf",
878 };
879 
880 const struct gfs2_log_operations *gfs2_log_ops[] = {
881         &gfs2_databuf_lops,
882         &gfs2_buf_lops,
883         &gfs2_revoke_lops,
884         NULL,
885 };
886 
887 

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