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 "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: rq_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