linux/fs/gfs2/lops.c
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   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10#include <linux/sched.h>
  11#include <linux/slab.h>
  12#include <linux/spinlock.h>
  13#include <linux/completion.h>
  14#include <linux/buffer_head.h>
  15#include <linux/mempool.h>
  16#include <linux/gfs2_ondisk.h>
  17#include <linux/bio.h>
  18#include <linux/fs.h>
  19#include <linux/list_sort.h>
  20
  21#include "dir.h"
  22#include "gfs2.h"
  23#include "incore.h"
  24#include "inode.h"
  25#include "glock.h"
  26#include "log.h"
  27#include "lops.h"
  28#include "meta_io.h"
  29#include "recovery.h"
  30#include "rgrp.h"
  31#include "trans.h"
  32#include "util.h"
  33#include "trace_gfs2.h"
  34
  35/**
  36 * gfs2_pin - Pin a buffer in memory
  37 * @sdp: The superblock
  38 * @bh: The buffer to be pinned
  39 *
  40 * The log lock must be held when calling this function
  41 */
  42void 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
  66static bool buffer_is_rgrp(const struct gfs2_bufdata *bd)
  67{
  68        return bd->bd_gl->gl_name.ln_type == LM_TYPE_RGRP;
  69}
  70
  71static 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
  99static 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
 133static 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
 142u64 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
 171static 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
 204static 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
 240void 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
 263static 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
 294static 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
 323void 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
 349static 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
 366void 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
 373static 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
 389static 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
 402static 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
 416static 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
 490static 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
 500static 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
 516static 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
 526static 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
 581static 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
 597static 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
 615static 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
 655static 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                atomic_dec(&gl->gl_revokes);
 666                clear_bit(GLF_LFLUSH, &gl->gl_flags);
 667                kmem_cache_free(gfs2_bufdata_cachep, bd);
 668        }
 669}
 670
 671static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
 672                                  struct gfs2_log_header_host *head, int pass)
 673{
 674        if (pass != 0)
 675                return;
 676
 677        jd->jd_found_revokes = 0;
 678        jd->jd_replay_tail = head->lh_tail;
 679}
 680
 681static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 682                                   struct gfs2_log_descriptor *ld, __be64 *ptr,
 683                                   int pass)
 684{
 685        struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 686        unsigned int blks = be32_to_cpu(ld->ld_length);
 687        unsigned int revokes = be32_to_cpu(ld->ld_data1);
 688        struct buffer_head *bh;
 689        unsigned int offset;
 690        u64 blkno;
 691        int first = 1;
 692        int error;
 693
 694        if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
 695                return 0;
 696
 697        offset = sizeof(struct gfs2_log_descriptor);
 698
 699        for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
 700                error = gfs2_replay_read_block(jd, start, &bh);
 701                if (error)
 702                        return error;
 703
 704                if (!first)
 705                        gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
 706
 707                while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
 708                        blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
 709
 710                        error = gfs2_revoke_add(jd, blkno, start);
 711                        if (error < 0) {
 712                                brelse(bh);
 713                                return error;
 714                        }
 715                        else if (error)
 716                                jd->jd_found_revokes++;
 717
 718                        if (!--revokes)
 719                                break;
 720                        offset += sizeof(u64);
 721                }
 722
 723                brelse(bh);
 724                offset = sizeof(struct gfs2_meta_header);
 725                first = 0;
 726        }
 727
 728        return 0;
 729}
 730
 731static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 732{
 733        struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 734
 735        if (error) {
 736                gfs2_revoke_clean(jd);
 737                return;
 738        }
 739        if (pass != 1)
 740                return;
 741
 742        fs_info(sdp, "jid=%u: Found %u revoke tags\n",
 743                jd->jd_jid, jd->jd_found_revokes);
 744
 745        gfs2_revoke_clean(jd);
 746}
 747
 748/**
 749 * databuf_lo_before_commit - Scan the data buffers, writing as we go
 750 *
 751 */
 752
 753static void databuf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 754{
 755        unsigned int limit = databuf_limit(sdp);
 756        unsigned int nbuf;
 757        if (tr == NULL)
 758                return;
 759        nbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
 760        gfs2_before_commit(sdp, limit, nbuf, &tr->tr_databuf, 1);
 761}
 762
 763static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 764                                    struct gfs2_log_descriptor *ld,
 765                                    __be64 *ptr, int pass)
 766{
 767        struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 768        struct gfs2_glock *gl = ip->i_gl;
 769        unsigned int blks = be32_to_cpu(ld->ld_data1);
 770        struct buffer_head *bh_log, *bh_ip;
 771        u64 blkno;
 772        u64 esc;
 773        int error = 0;
 774
 775        if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
 776                return 0;
 777
 778        gfs2_replay_incr_blk(jd, &start);
 779        for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
 780                blkno = be64_to_cpu(*ptr++);
 781                esc = be64_to_cpu(*ptr++);
 782
 783                jd->jd_found_blocks++;
 784
 785                if (gfs2_revoke_check(jd, blkno, start))
 786                        continue;
 787
 788                error = gfs2_replay_read_block(jd, start, &bh_log);
 789                if (error)
 790                        return error;
 791
 792                bh_ip = gfs2_meta_new(gl, blkno);
 793                memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 794
 795                /* Unescape */
 796                if (esc) {
 797                        __be32 *eptr = (__be32 *)bh_ip->b_data;
 798                        *eptr = cpu_to_be32(GFS2_MAGIC);
 799                }
 800                mark_buffer_dirty(bh_ip);
 801
 802                brelse(bh_log);
 803                brelse(bh_ip);
 804
 805                jd->jd_replayed_blocks++;
 806        }
 807
 808        return error;
 809}
 810
 811/* FIXME: sort out accounting for log blocks etc. */
 812
 813static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 814{
 815        struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 816        struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 817
 818        if (error) {
 819                gfs2_meta_sync(ip->i_gl);
 820                return;
 821        }
 822        if (pass != 1)
 823                return;
 824
 825        /* data sync? */
 826        gfs2_meta_sync(ip->i_gl);
 827
 828        fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
 829                jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
 830}
 831
 832static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 833{
 834        struct list_head *head;
 835        struct gfs2_bufdata *bd;
 836
 837        if (tr == NULL)
 838                return;
 839
 840        head = &tr->tr_databuf;
 841        while (!list_empty(head)) {
 842                bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
 843                list_del_init(&bd->bd_list);
 844                gfs2_unpin(sdp, bd->bd_bh, tr);
 845        }
 846}
 847
 848
 849const struct gfs2_log_operations gfs2_buf_lops = {
 850        .lo_before_commit = buf_lo_before_commit,
 851        .lo_after_commit = buf_lo_after_commit,
 852        .lo_before_scan = buf_lo_before_scan,
 853        .lo_scan_elements = buf_lo_scan_elements,
 854        .lo_after_scan = buf_lo_after_scan,
 855        .lo_name = "buf",
 856};
 857
 858const struct gfs2_log_operations gfs2_revoke_lops = {
 859        .lo_before_commit = revoke_lo_before_commit,
 860        .lo_after_commit = revoke_lo_after_commit,
 861        .lo_before_scan = revoke_lo_before_scan,
 862        .lo_scan_elements = revoke_lo_scan_elements,
 863        .lo_after_scan = revoke_lo_after_scan,
 864        .lo_name = "revoke",
 865};
 866
 867const struct gfs2_log_operations gfs2_databuf_lops = {
 868        .lo_before_commit = databuf_lo_before_commit,
 869        .lo_after_commit = databuf_lo_after_commit,
 870        .lo_scan_elements = databuf_lo_scan_elements,
 871        .lo_after_scan = databuf_lo_after_scan,
 872        .lo_name = "databuf",
 873};
 874
 875const struct gfs2_log_operations *gfs2_log_ops[] = {
 876        &gfs2_databuf_lops,
 877        &gfs2_buf_lops,
 878        &gfs2_revoke_lops,
 879        NULL,
 880};
 881
 882