fs/gfs2/lops.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/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_len);
  85         clear_bit(GBF_FULL, &bi->bi_flags);
  86         rgd->rd_free_clone = rgd->rd_free;
  87         rgd->rd_extfail_pt = rgd->rd_free;
  88 }
  89
  90 /**
  91  * gfs2_unpin - Unpin a buffer
  92  * @sdp: the filesystem the buffer belongs to
  93  * @bh: The buffer to unpin
  94  * @ai:
  95  * @flags: The inode dirty flags
  96  *
  97  */
  98
  99 static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
 100                        struct gfs2_trans *tr)
 101 {
 102         struct gfs2_bufdata *bd = bh->b_private;
 103
 104         BUG_ON(!buffer_uptodate(bh));
 105         BUG_ON(!buffer_pinned(bh));
 106
 107         lock_buffer(bh);
 108         mark_buffer_dirty(bh);
 109         clear_buffer_pinned(bh);
 110
 111         if (buffer_is_rgrp(bd))
 112                 maybe_release_space(bd);
 113
 114         spin_lock(&sdp->sd_ail_lock);
 115         if (bd->bd_tr) {
 116                 list_del(&bd->bd_ail_st_list);
 117                 brelse(bh);
 118         } else {
 119                 struct gfs2_glock *gl = bd->bd_gl;
 120                 list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
 121                 atomic_inc(&gl->gl_ail_count);
 122         }
 123         bd->bd_tr = tr;
 124         list_add(&bd->bd_ail_st_list, &tr->tr_ail1_list);
 125         spin_unlock(&sdp->sd_ail_lock);
 126
 127         clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 128         trace_gfs2_pin(bd, 0);
 129         unlock_buffer(bh);
 130         atomic_dec(&sdp->sd_log_pinned);
 131 }
 132
 133 static void gfs2_log_incr_head(struct gfs2_sbd *sdp)
 134 {
 135         BUG_ON((sdp->sd_log_flush_head == sdp->sd_log_tail) &&
 136                (sdp->sd_log_flush_head != sdp->sd_log_head));
 137
 138         if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks)
 139                 sdp->sd_log_flush_head = 0;
 140 }
 141
 142 u64 gfs2_log_bmap(struct gfs2_sbd *sdp)
 143 {
 144         unsigned int lbn = sdp->sd_log_flush_head;
 145         struct gfs2_journal_extent *je;
 146         u64 block;
 147
 148         list_for_each_entry(je, &sdp->sd_jdesc->extent_list, list) {
 149                 if ((lbn >= je->lblock) && (lbn < (je->lblock + je->blocks))) {
 150                         block = je->dblock + lbn - je->lblock;
 151                         gfs2_log_incr_head(sdp);
 152                         return block;
 153                 }
 154         }
 155
 156         return -1;
 157 }
 158
 159 /**
 160  * gfs2_end_log_write_bh - end log write of pagecache data with buffers
 161  * @sdp: The superblock
 162  * @bvec: The bio_vec
 163  * @error: The i/o status
 164  *
 165  * This finds the relevant buffers and unlocks them and sets the
 166  * error flag according to the status of the i/o request. This is
 167  * used when the log is writing data which has an in-place version
 168  * that is pinned in the pagecache.
 169  */
 170
 171 static void gfs2_end_log_write_bh(struct gfs2_sbd *sdp, struct bio_vec *bvec,
 172                                   blk_status_t error)
 173 {
 174         struct buffer_head *bh, *next;
 175         struct page *page = bvec->bv_page;
 176         unsigned size;
 177
 178         bh = page_buffers(page);
 179         size = bvec->bv_len;
 180         while (bh_offset(bh) < bvec->bv_offset)
 181                 bh = bh->b_this_page;
 182         do {
 183                 if (error)
 184                         mark_buffer_write_io_error(bh);
 185                 unlock_buffer(bh);
 186                 next = bh->b_this_page;
 187                 size -= bh->b_size;
 188                 brelse(bh);
 189                 bh = next;
 190         } while(bh && size);
 191 }
 192
 193 /**
 194  * gfs2_end_log_write - end of i/o to the log
 195  * @bio: The bio
 196  * @error: Status of i/o request
 197  *
 198  * Each bio_vec contains either data from the pagecache or data
 199  * relating to the log itself. Here we iterate over the bio_vec
 200  * array, processing both kinds of data.
 201  *
 202  */
 203
 204 static void gfs2_end_log_write(struct bio *bio)
 205 {
 206         struct gfs2_sbd *sdp = bio->bi_private;
 207         struct bio_vec *bvec;
 208         struct page *page;
 209         int i;
 210
 211         if (bio->bi_status) {
 212                 fs_err(sdp, "Error %d writing to journal, jid=%u\n",
 213                        bio->bi_status, sdp->sd_jdesc->jd_jid);
 214                 wake_up(&sdp->sd_logd_waitq);
 215         }
 216
 217         bio_for_each_segment_all(bvec, bio, i) {
 218                 page = bvec->bv_page;
 219                 if (page_has_buffers(page))
 220                         gfs2_end_log_write_bh(sdp, bvec, bio->bi_status);
 221                 else
 222                         mempool_free(page, gfs2_page_pool);
 223         }
 224
 225         bio_put(bio);
 226         if (atomic_dec_and_test(&sdp->sd_log_in_flight))
 227                 wake_up(&sdp->sd_log_flush_wait);
 228 }
 229
 230 /**
 231  * gfs2_log_flush_bio - Submit any pending log bio
 232  * @sdp: The superblock
 233  * @op: REQ_OP
 234  * @op_flags: req_flag_bits
 235  *
 236  * Submit any pending part-built or full bio to the block device. If
 237  * there is no pending bio, then this is a no-op.
 238  */
 239
 240 void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int op, int op_flags)
 241 {
 242         if (sdp->sd_log_bio) {
 243                 atomic_inc(&sdp->sd_log_in_flight);
 244                 bio_set_op_attrs(sdp->sd_log_bio, op, op_flags);
 245                 submit_bio(sdp->sd_log_bio);
 246                 sdp->sd_log_bio = NULL;
 247         }
 248 }
 249
 250 /**
 251  * gfs2_log_alloc_bio - Allocate a new bio for log writing
 252  * @sdp: The superblock
 253  * @blkno: The next device block number we want to write to
 254  *
 255  * This should never be called when there is a cached bio in the
 256  * super block. When it returns, there will be a cached bio in the
 257  * super block which will have as many bio_vecs as the device is
 258  * happy to handle.
 259  *
 260  * Returns: Newly allocated bio
 261  */
 262
 263 static struct bio *gfs2_log_alloc_bio(struct gfs2_sbd *sdp, u64 blkno)
 264 {
 265         struct super_block *sb = sdp->sd_vfs;
 266         struct bio *bio;
 267
 268         BUG_ON(sdp->sd_log_bio);
 269
 270         bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES);
 271         bio->bi_iter.bi_sector = blkno * (sb->s_blocksize >> 9);
 272         bio_set_dev(bio, sb->s_bdev);
 273         bio->bi_end_io = gfs2_end_log_write;
 274         bio->bi_private = sdp;
 275
 276         sdp->sd_log_bio = bio;
 277
 278         return bio;
 279 }
 280
 281 /**
 282  * gfs2_log_get_bio - Get cached log bio, or allocate a new one
 283  * @sdp: The superblock
 284  * @blkno: The device block number we want to write to
 285  *
 286  * If there is a cached bio, then if the next block number is sequential
 287  * with the previous one, return it, otherwise flush the bio to the
 288  * device. If there is not a cached bio, or we just flushed it, then
 289  * allocate a new one.
 290  *
 291  * Returns: The bio to use for log writes
 292  */
 293
 294 static struct bio *gfs2_log_get_bio(struct gfs2_sbd *sdp, u64 blkno)
 295 {
 296         struct bio *bio = sdp->sd_log_bio;
 297         u64 nblk;
 298
 299         if (bio) {
 300                 nblk = bio_end_sector(bio);
 301                 nblk >>= sdp->sd_fsb2bb_shift;
 302                 if (blkno == nblk)
 303                         return bio;
 304                 gfs2_log_flush_bio(sdp, REQ_OP_WRITE, 0);
 305         }
 306
 307         return gfs2_log_alloc_bio(sdp, blkno);
 308 }
 309
 310 /**
 311  * gfs2_log_write - write to log
 312  * @sdp: the filesystem
 313  * @page: the page to write
 314  * @size: the size of the data to write
 315  * @offset: the offset within the page
 316  * @blkno: block number of the log entry
 317  *
 318  * Try and add the page segment to the current bio. If that fails,
 319  * submit the current bio to the device and create a new one, and
 320  * then add the page segment to that.
 321  */
 322
 323 void gfs2_log_write(struct gfs2_sbd *sdp, struct page *page,
 324                     unsigned size, unsigned offset, u64 blkno)
 325 {
 326         struct bio *bio;
 327         int ret;
 328
 329         bio = gfs2_log_get_bio(sdp, blkno);
 330         ret = bio_add_page(bio, page, size, offset);
 331         if (ret == 0) {
 332                 gfs2_log_flush_bio(sdp, REQ_OP_WRITE, 0);
 333                 bio = gfs2_log_alloc_bio(sdp, blkno);
 334                 ret = bio_add_page(bio, page, size, offset);
 335                 WARN_ON(ret == 0);
 336         }
 337 }
 338
 339 /**
 340  * gfs2_log_write_bh - write a buffer's content to the log
 341  * @sdp: The super block
 342  * @bh: The buffer pointing to the in-place location
 343  *
 344  * This writes the content of the buffer to the next available location
 345  * in the log. The buffer will be unlocked once the i/o to the log has
 346  * completed.
 347  */
 348
 349 static void gfs2_log_write_bh(struct gfs2_sbd *sdp, struct buffer_head *bh)
 350 {
 351         gfs2_log_write(sdp, bh->b_page, bh->b_size, bh_offset(bh),
 352                        gfs2_log_bmap(sdp));
 353 }
 354
 355 /**
 356  * gfs2_log_write_page - write one block stored in a page, into the log
 357  * @sdp: The superblock
 358  * @page: The struct page
 359  *
 360  * This writes the first block-sized part of the page into the log. Note
 361  * that the page must have been allocated from the gfs2_page_pool mempool
 362  * and that after this has been called, ownership has been transferred and
 363  * the page may be freed at any time.
 364  */
 365
 366 void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page)
 367 {
 368         struct super_block *sb = sdp->sd_vfs;
 369         gfs2_log_write(sdp, page, sb->s_blocksize, 0,
 370                        gfs2_log_bmap(sdp));
 371 }
 372
 373 static struct page *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type,
 374                                       u32 ld_length, u32 ld_data1)
 375 {
 376         struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
 377         struct gfs2_log_descriptor *ld = page_address(page);
 378         clear_page(ld);
 379         ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 380         ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
 381         ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
 382         ld->ld_type = cpu_to_be32(ld_type);
 383         ld->ld_length = cpu_to_be32(ld_length);
 384         ld->ld_data1 = cpu_to_be32(ld_data1);
 385         ld->ld_data2 = 0;
 386         return page;
 387 }
 388
 389 static void gfs2_check_magic(struct buffer_head *bh)
 390 {
 391         void *kaddr;
 392         __be32 *ptr;
 393
 394         clear_buffer_escaped(bh);
 395         kaddr = kmap_atomic(bh->b_page);
 396         ptr = kaddr + bh_offset(bh);
 397         if (*ptr == cpu_to_be32(GFS2_MAGIC))
 398                 set_buffer_escaped(bh);
 399         kunmap_atomic(kaddr);
 400 }
 401
 402 static int blocknr_cmp(void *priv, struct list_head *a, struct list_head *b)
 403 {
 404         struct gfs2_bufdata *bda, *bdb;
 405
 406         bda = list_entry(a, struct gfs2_bufdata, bd_list);
 407         bdb = list_entry(b, struct gfs2_bufdata, bd_list);
 408
 409         if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr)
 410                 return -1;
 411         if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr)
 412                 return 1;
 413         return 0;
 414 }
 415
 416 static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
 417                                 unsigned int total, struct list_head *blist,
 418                                 bool is_databuf)
 419 {
 420         struct gfs2_log_descriptor *ld;
 421         struct gfs2_bufdata *bd1 = NULL, *bd2;
 422         struct page *page;
 423         unsigned int num;
 424         unsigned n;
 425         __be64 *ptr;
 426
 427         gfs2_log_lock(sdp);
 428         list_sort(NULL, blist, blocknr_cmp);
 429         bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list);
 430         while(total) {
 431                 num = total;
 432                 if (total > limit)
 433                         num = limit;
 434                 gfs2_log_unlock(sdp);
 435                 page = gfs2_get_log_desc(sdp,
 436                                          is_databuf ? GFS2_LOG_DESC_JDATA :
 437                                          GFS2_LOG_DESC_METADATA, num + 1, num);
 438                 ld = page_address(page);
 439                 gfs2_log_lock(sdp);
 440                 ptr = (__be64 *)(ld + 1);
 441
 442                 n = 0;
 443                 list_for_each_entry_continue(bd1, blist, bd_list) {
 444                         *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
 445                         if (is_databuf) {
 446                                 gfs2_check_magic(bd1->bd_bh);
 447                                 *ptr++ = cpu_to_be64(buffer_escaped(bd1->bd_bh) ? 1 : 0);
 448                         }
 449                         if (++n >= num)
 450                                 break;
 451                 }
 452
 453                 gfs2_log_unlock(sdp);
 454                 gfs2_log_write_page(sdp, page);
 455                 gfs2_log_lock(sdp);
 456
 457                 n = 0;
 458                 list_for_each_entry_continue(bd2, blist, bd_list) {
 459                         get_bh(bd2->bd_bh);
 460                         gfs2_log_unlock(sdp);
 461                         lock_buffer(bd2->bd_bh);
 462
 463                         if (buffer_escaped(bd2->bd_bh)) {
 464                                 void *kaddr;
 465                                 page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
 466                                 ptr = page_address(page);
 467                                 kaddr = kmap_atomic(bd2->bd_bh->b_page);
 468                                 memcpy(ptr, kaddr + bh_offset(bd2->bd_bh),
 469                                        bd2->bd_bh->b_size);
 470                                 kunmap_atomic(kaddr);
 471                                 *(__be32 *)ptr = 0;
 472                                 clear_buffer_escaped(bd2->bd_bh);
 473                                 unlock_buffer(bd2->bd_bh);
 474                                 brelse(bd2->bd_bh);
 475                                 gfs2_log_write_page(sdp, page);
 476                         } else {
 477                                 gfs2_log_write_bh(sdp, bd2->bd_bh);
 478                         }
 479                         gfs2_log_lock(sdp);
 480                         if (++n >= num)
 481                                 break;
 482                 }
 483
 484                 BUG_ON(total < num);
 485                 total -= num;
 486         }
 487         gfs2_log_unlock(sdp);
 488 }
 489
 490 static void buf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 491 {
 492         unsigned int limit = buf_limit(sdp); /* 503 for 4k blocks */
 493         unsigned int nbuf;
 494         if (tr == NULL)
 495                 return;
 496         nbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm;
 497         gfs2_before_commit(sdp, limit, nbuf, &tr->tr_buf, 0);
 498 }
 499
 500 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 501 {
 502         struct list_head *head;
 503         struct gfs2_bufdata *bd;
 504
 505         if (tr == NULL)
 506                 return;
 507
 508         head = &tr->tr_buf;
 509         while (!list_empty(head)) {
 510                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
 511                 list_del_init(&bd->bd_list);
 512                 gfs2_unpin(sdp, bd->bd_bh, tr);
 513         }
 514 }
 515
 516 static void buf_lo_before_scan(struct gfs2_jdesc *jd,
 517                                struct gfs2_log_header_host *head, int pass)
 518 {
 519         if (pass != 0)
 520                 return;
 521
 522         jd->jd_found_blocks = 0;
 523         jd->jd_replayed_blocks = 0;
 524 }
 525
 526 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 527                                 struct gfs2_log_descriptor *ld, __be64 *ptr,
 528                                 int pass)
 529 {
 530         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 531         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 532         struct gfs2_glock *gl = ip->i_gl;
 533         unsigned int blks = be32_to_cpu(ld->ld_data1);
 534         struct buffer_head *bh_log, *bh_ip;
 535         u64 blkno;
 536         int error = 0;
 537
 538         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
 539                 return 0;
 540
 541         gfs2_replay_incr_blk(jd, &start);
 542
 543         for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
 544                 blkno = be64_to_cpu(*ptr++);
 545
 546                 jd->jd_found_blocks++;
 547
 548                 if (gfs2_revoke_check(jd, blkno, start))
 549                         continue;
 550
 551                 error = gfs2_replay_read_block(jd, start, &bh_log);
 552                 if (error)
 553                         return error;
 554
 555                 bh_ip = gfs2_meta_new(gl, blkno);
 556                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 557
 558                 if (gfs2_meta_check(sdp, bh_ip))
 559                         error = -EIO;
 560                 else
 561                         mark_buffer_dirty(bh_ip);
 562
 563                 brelse(bh_log);
 564                 brelse(bh_ip);
 565
 566                 if (error)
 567                         break;
 568
 569                 jd->jd_replayed_blocks++;
 570         }
 571
 572         return error;
 573 }
 574
 575 /**
 576  * gfs2_meta_sync - Sync all buffers associated with a glock
 577  * @gl: The glock
 578  *
 579  */
 580
 581 static void gfs2_meta_sync(struct gfs2_glock *gl)
 582 {
 583         struct address_space *mapping = gfs2_glock2aspace(gl);
 584         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 585         int error;
 586
 587         if (mapping == NULL)
 588                 mapping = &sdp->sd_aspace;
 589
 590         filemap_fdatawrite(mapping);
 591         error = filemap_fdatawait(mapping);
 592
 593         if (error)
 594                 gfs2_io_error(gl->gl_name.ln_sbd);
 595 }
 596
 597 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 598 {
 599         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 600         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 601
 602         if (error) {
 603                 gfs2_meta_sync(ip->i_gl);
 604                 return;
 605         }
 606         if (pass != 1)
 607                 return;
 608
 609         gfs2_meta_sync(ip->i_gl);
 610
 611         fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
 612                 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
 613 }
 614
 615 static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 616 {
 617         struct gfs2_meta_header *mh;
 618         unsigned int offset;
 619         struct list_head *head = &sdp->sd_log_le_revoke;
 620         struct gfs2_bufdata *bd;
 621         struct page *page;
 622         unsigned int length;
 623
 624         gfs2_write_revokes(sdp);
 625         if (!sdp->sd_log_num_revoke)
 626                 return;
 627
 628         length = gfs2_struct2blk(sdp, sdp->sd_log_num_revoke, sizeof(u64));
 629         page = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE, length, sdp->sd_log_num_revoke);
 630         offset = sizeof(struct gfs2_log_descriptor);
 631
 632         list_for_each_entry(bd, head, bd_list) {
 633                 sdp->sd_log_num_revoke--;
 634
 635                 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
 636
 637                         gfs2_log_write_page(sdp, page);
 638                         page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
 639                         mh = page_address(page);
 640                         clear_page(mh);
 641                         mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
 642                         mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
 643                         mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
 644                         offset = sizeof(struct gfs2_meta_header);
 645                 }
 646
 647                 *(__be64 *)(page_address(page) + offset) = cpu_to_be64(bd->bd_blkno);
 648                 offset += sizeof(u64);
 649         }
 650         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
 651
 652         gfs2_log_write_page(sdp, page);
 653 }
 654
 655 static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 656 {
 657         struct list_head *head = &sdp->sd_log_le_revoke;
 658         struct gfs2_bufdata *bd;
 659         struct gfs2_glock *gl;
 660
 661         while (!list_empty(head)) {
 662                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
 663                 list_del_init(&bd->bd_list);
 664                 gl = bd->bd_gl;
 665                 gfs2_glock_remove_revoke(gl);
 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