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/gfs2_ondisk.h>
  16 #include <linux/bio.h>
  17 #include <linux/fs.h>
  18
  19 #include "gfs2.h"
  20 #include "incore.h"
  21 #include "inode.h"
  22 #include "glock.h"
  23 #include "log.h"
  24 #include "lops.h"
  25 #include "meta_io.h"
  26 #include "recovery.h"
  27 #include "rgrp.h"
  28 #include "trans.h"
  29 #include "util.h"
  30 #include "trace_gfs2.h"
  31
  32 /**
  33  * gfs2_pin - Pin a buffer in memory
  34  * @sdp: The superblock
  35  * @bh: The buffer to be pinned
  36  *
  37  * The log lock must be held when calling this function
  38  */
  39 static void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
  40 {
  41         struct gfs2_bufdata *bd;
  42
  43         BUG_ON(!current->journal_info);
  44
  45         clear_buffer_dirty(bh);
  46         if (test_set_buffer_pinned(bh))
  47                 gfs2_assert_withdraw(sdp, 0);
  48         if (!buffer_uptodate(bh))
  49                 gfs2_io_error_bh(sdp, bh);
  50         bd = bh->b_private;
  51         /* If this buffer is in the AIL and it has already been written
  52          * to in-place disk block, remove it from the AIL.
  53          */
  54         spin_lock(&sdp->sd_ail_lock);
  55         if (bd->bd_ail)
  56                 list_move(&bd->bd_ail_st_list, &bd->bd_ail->ai_ail2_list);
  57         spin_unlock(&sdp->sd_ail_lock);
  58         get_bh(bh);
  59         atomic_inc(&sdp->sd_log_pinned);
  60         trace_gfs2_pin(bd, 1);
  61 }
  62
  63 /**
  64  * gfs2_unpin - Unpin a buffer
  65  * @sdp: the filesystem the buffer belongs to
  66  * @bh: The buffer to unpin
  67  * @ai:
  68  * @flags: The inode dirty flags
  69  *
  70  */
  71
  72 static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
  73                        struct gfs2_ail *ai)
  74 {
  75         struct gfs2_bufdata *bd = bh->b_private;
  76
  77         BUG_ON(!buffer_uptodate(bh));
  78         BUG_ON(!buffer_pinned(bh));
  79
  80         lock_buffer(bh);
  81         mark_buffer_dirty(bh);
  82         clear_buffer_pinned(bh);
  83
  84         spin_lock(&sdp->sd_ail_lock);
  85         if (bd->bd_ail) {
  86                 list_del(&bd->bd_ail_st_list);
  87                 brelse(bh);
  88         } else {
  89                 struct gfs2_glock *gl = bd->bd_gl;
  90                 list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
  91                 atomic_inc(&gl->gl_ail_count);
  92         }
  93         bd->bd_ail = ai;
  94         list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list);
  95         spin_unlock(&sdp->sd_ail_lock);
  96
  97         clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
  98         trace_gfs2_pin(bd, 0);
  99         unlock_buffer(bh);
 100         atomic_dec(&sdp->sd_log_pinned);
 101 }
 102
 103
 104 static inline struct gfs2_log_descriptor *bh_log_desc(struct buffer_head *bh)
 105 {
 106         return (struct gfs2_log_descriptor *)bh->b_data;
 107 }
 108
 109 static inline __be64 *bh_log_ptr(struct buffer_head *bh)
 110 {
 111         struct gfs2_log_descriptor *ld = bh_log_desc(bh);
 112         return (__force __be64 *)(ld + 1);
 113 }
 114
 115 static inline __be64 *bh_ptr_end(struct buffer_head *bh)
 116 {
 117         return (__force __be64 *)(bh->b_data + bh->b_size);
 118 }
 119
 120
 121 static struct buffer_head *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type)
 122 {
 123         struct buffer_head *bh = gfs2_log_get_buf(sdp);
 124         struct gfs2_log_descriptor *ld = bh_log_desc(bh);
 125         ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 126         ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
 127         ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
 128         ld->ld_type = cpu_to_be32(ld_type);
 129         ld->ld_length = 0;
 130         ld->ld_data1 = 0;
 131         ld->ld_data2 = 0;
 132         memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
 133         return bh;
 134 }
 135
 136 static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 137 {
 138         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
 139         struct gfs2_meta_header *mh;
 140         struct gfs2_trans *tr;
 141
 142         lock_buffer(bd->bd_bh);
 143         gfs2_log_lock(sdp);
 144         if (!list_empty(&bd->bd_list_tr))
 145                 goto out;
 146         tr = current->journal_info;
 147         tr->tr_touched = 1;
 148         tr->tr_num_buf++;
 149         list_add(&bd->bd_list_tr, &tr->tr_list_buf);
 150         if (!list_empty(&le->le_list))
 151                 goto out;
 152         set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 153         set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 154         gfs2_meta_check(sdp, bd->bd_bh);
 155         gfs2_pin(sdp, bd->bd_bh);
 156         mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
 157         mh->__pad0 = cpu_to_be64(0);
 158         mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
 159         sdp->sd_log_num_buf++;
 160         list_add(&le->le_list, &sdp->sd_log_le_buf);
 161         tr->tr_num_buf_new++;
 162 out:
 163         gfs2_log_unlock(sdp);
 164         unlock_buffer(bd->bd_bh);
 165 }
 166
 167 static void buf_lo_before_commit(struct gfs2_sbd *sdp)
 168 {
 169         struct buffer_head *bh;
 170         struct gfs2_log_descriptor *ld;
 171         struct gfs2_bufdata *bd1 = NULL, *bd2;
 172         unsigned int total;
 173         unsigned int limit;
 174         unsigned int num;
 175         unsigned n;
 176         __be64 *ptr;
 177
 178         limit = buf_limit(sdp);
 179         /* for 4k blocks, limit = 503 */
 180
 181         gfs2_log_lock(sdp);
 182         total = sdp->sd_log_num_buf;
 183         bd1 = bd2 = list_prepare_entry(bd1, &sdp->sd_log_le_buf, bd_le.le_list);
 184         while(total) {
 185                 num = total;
 186                 if (total > limit)
 187                         num = limit;
 188                 gfs2_log_unlock(sdp);
 189                 bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_METADATA);
 190                 gfs2_log_lock(sdp);
 191                 ld = bh_log_desc(bh);
 192                 ptr = bh_log_ptr(bh);
 193                 ld->ld_length = cpu_to_be32(num + 1);
 194                 ld->ld_data1 = cpu_to_be32(num);
 195
 196                 n = 0;
 197                 list_for_each_entry_continue(bd1, &sdp->sd_log_le_buf,
 198                                              bd_le.le_list) {
 199                         *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
 200                         if (++n >= num)
 201                                 break;
 202                 }
 203
 204                 gfs2_log_unlock(sdp);
 205                 submit_bh(WRITE_SYNC, bh);
 206                 gfs2_log_lock(sdp);
 207
 208                 n = 0;
 209                 list_for_each_entry_continue(bd2, &sdp->sd_log_le_buf,
 210                                              bd_le.le_list) {
 211                         get_bh(bd2->bd_bh);
 212                         gfs2_log_unlock(sdp);
 213                         lock_buffer(bd2->bd_bh);
 214                         bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
 215                         submit_bh(WRITE_SYNC, bh);
 216                         gfs2_log_lock(sdp);
 217                         if (++n >= num)
 218                                 break;
 219                 }
 220
 221                 BUG_ON(total < num);
 222                 total -= num;
 223         }
 224         gfs2_log_unlock(sdp);
 225 }
 226
 227 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 228 {
 229         struct list_head *head = &sdp->sd_log_le_buf;
 230         struct gfs2_bufdata *bd;
 231
 232         while (!list_empty(head)) {
 233                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 234                 list_del_init(&bd->bd_le.le_list);
 235                 sdp->sd_log_num_buf--;
 236
 237                 gfs2_unpin(sdp, bd->bd_bh, ai);
 238         }
 239         gfs2_assert_warn(sdp, !sdp->sd_log_num_buf);
 240 }
 241
 242 static void buf_lo_before_scan(struct gfs2_jdesc *jd,
 243                                struct gfs2_log_header_host *head, int pass)
 244 {
 245         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 246
 247         if (pass != 0)
 248                 return;
 249
 250         sdp->sd_found_blocks = 0;
 251         sdp->sd_replayed_blocks = 0;
 252 }
 253
 254 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 255                                 struct gfs2_log_descriptor *ld, __be64 *ptr,
 256                                 int pass)
 257 {
 258         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 259         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 260         struct gfs2_glock *gl = ip->i_gl;
 261         unsigned int blks = be32_to_cpu(ld->ld_data1);
 262         struct buffer_head *bh_log, *bh_ip;
 263         u64 blkno;
 264         int error = 0;
 265
 266         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
 267                 return 0;
 268
 269         gfs2_replay_incr_blk(sdp, &start);
 270
 271         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 272                 blkno = be64_to_cpu(*ptr++);
 273
 274                 sdp->sd_found_blocks++;
 275
 276                 if (gfs2_revoke_check(sdp, blkno, start))
 277                         continue;
 278
 279                 error = gfs2_replay_read_block(jd, start, &bh_log);
 280                 if (error)
 281                         return error;
 282
 283                 bh_ip = gfs2_meta_new(gl, blkno);
 284                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 285
 286                 if (gfs2_meta_check(sdp, bh_ip))
 287                         error = -EIO;
 288                 else
 289                         mark_buffer_dirty(bh_ip);
 290
 291                 brelse(bh_log);
 292                 brelse(bh_ip);
 293
 294                 if (error)
 295                         break;
 296
 297                 sdp->sd_replayed_blocks++;
 298         }
 299
 300         return error;
 301 }
 302
 303 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 304 {
 305         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 306         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 307
 308         if (error) {
 309                 gfs2_meta_sync(ip->i_gl);
 310                 return;
 311         }
 312         if (pass != 1)
 313                 return;
 314
 315         gfs2_meta_sync(ip->i_gl);
 316
 317         fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
 318                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
 319 }
 320
 321 static void revoke_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 322 {
 323         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
 324         struct gfs2_glock *gl = bd->bd_gl;
 325         struct gfs2_trans *tr;
 326
 327         tr = current->journal_info;
 328         tr->tr_touched = 1;
 329         tr->tr_num_revoke++;
 330         sdp->sd_log_num_revoke++;
 331         atomic_inc(&gl->gl_revokes);
 332         set_bit(GLF_LFLUSH, &gl->gl_flags);
 333         list_add(&le->le_list, &sdp->sd_log_le_revoke);
 334 }
 335
 336 static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
 337 {
 338         struct gfs2_log_descriptor *ld;
 339         struct gfs2_meta_header *mh;
 340         struct buffer_head *bh;
 341         unsigned int offset;
 342         struct list_head *head = &sdp->sd_log_le_revoke;
 343         struct gfs2_bufdata *bd;
 344
 345         if (!sdp->sd_log_num_revoke)
 346                 return;
 347
 348         bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE);
 349         ld = bh_log_desc(bh);
 350         ld->ld_length = cpu_to_be32(gfs2_struct2blk(sdp, sdp->sd_log_num_revoke,
 351                                                     sizeof(u64)));
 352         ld->ld_data1 = cpu_to_be32(sdp->sd_log_num_revoke);
 353         offset = sizeof(struct gfs2_log_descriptor);
 354
 355         list_for_each_entry(bd, head, bd_le.le_list) {
 356                 sdp->sd_log_num_revoke--;
 357
 358                 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
 359                         submit_bh(WRITE_SYNC, bh);
 360
 361                         bh = gfs2_log_get_buf(sdp);
 362                         mh = (struct gfs2_meta_header *)bh->b_data;
 363                         mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
 364                         mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
 365                         mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
 366                         offset = sizeof(struct gfs2_meta_header);
 367                 }
 368
 369                 *(__be64 *)(bh->b_data + offset) = cpu_to_be64(bd->bd_blkno);
 370                 offset += sizeof(u64);
 371         }
 372         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
 373
 374         submit_bh(WRITE_SYNC, bh);
 375 }
 376
 377 static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 378 {
 379         struct list_head *head = &sdp->sd_log_le_revoke;
 380         struct gfs2_bufdata *bd;
 381         struct gfs2_glock *gl;
 382
 383         while (!list_empty(head)) {
 384                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 385                 list_del_init(&bd->bd_le.le_list);
 386                 gl = bd->bd_gl;
 387                 atomic_dec(&gl->gl_revokes);
 388                 clear_bit(GLF_LFLUSH, &gl->gl_flags);
 389                 kmem_cache_free(gfs2_bufdata_cachep, bd);
 390         }
 391 }
 392
 393 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
 394                                   struct gfs2_log_header_host *head, int pass)
 395 {
 396         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 397
 398         if (pass != 0)
 399                 return;
 400
 401         sdp->sd_found_revokes = 0;
 402         sdp->sd_replay_tail = head->lh_tail;
 403 }
 404
 405 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 406                                    struct gfs2_log_descriptor *ld, __be64 *ptr,
 407                                    int pass)
 408 {
 409         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 410         unsigned int blks = be32_to_cpu(ld->ld_length);
 411         unsigned int revokes = be32_to_cpu(ld->ld_data1);
 412         struct buffer_head *bh;
 413         unsigned int offset;
 414         u64 blkno;
 415         int first = 1;
 416         int error;
 417
 418         if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
 419                 return 0;
 420
 421         offset = sizeof(struct gfs2_log_descriptor);
 422
 423         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 424                 error = gfs2_replay_read_block(jd, start, &bh);
 425                 if (error)
 426                         return error;
 427
 428                 if (!first)
 429                         gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
 430
 431                 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
 432                         blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
 433
 434                         error = gfs2_revoke_add(sdp, blkno, start);
 435                         if (error < 0) {
 436                                 brelse(bh);
 437                                 return error;
 438                         }
 439                         else if (error)
 440                                 sdp->sd_found_revokes++;
 441
 442                         if (!--revokes)
 443                                 break;
 444                         offset += sizeof(u64);
 445                 }
 446
 447                 brelse(bh);
 448                 offset = sizeof(struct gfs2_meta_header);
 449                 first = 0;
 450         }
 451
 452         return 0;
 453 }
 454
 455 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 456 {
 457         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 458
 459         if (error) {
 460                 gfs2_revoke_clean(sdp);
 461                 return;
 462         }
 463         if (pass != 1)
 464                 return;
 465
 466         fs_info(sdp, "jid=%u: Found %u revoke tags\n",
 467                 jd->jd_jid, sdp->sd_found_revokes);
 468
 469         gfs2_revoke_clean(sdp);
 470 }
 471
 472 static void rg_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 473 {
 474         struct gfs2_rgrpd *rgd;
 475         struct gfs2_trans *tr = current->journal_info;
 476
 477         tr->tr_touched = 1;
 478
 479         rgd = container_of(le, struct gfs2_rgrpd, rd_le);
 480
 481         gfs2_log_lock(sdp);
 482         if (!list_empty(&le->le_list)){
 483                 gfs2_log_unlock(sdp);
 484                 return;
 485         }
 486         gfs2_rgrp_bh_hold(rgd);
 487         sdp->sd_log_num_rg++;
 488         list_add(&le->le_list, &sdp->sd_log_le_rg);
 489         gfs2_log_unlock(sdp);
 490 }
 491
 492 static void rg_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 493 {
 494         struct list_head *head = &sdp->sd_log_le_rg;
 495         struct gfs2_rgrpd *rgd;
 496
 497         while (!list_empty(head)) {
 498                 rgd = list_entry(head->next, struct gfs2_rgrpd, rd_le.le_list);
 499                 list_del_init(&rgd->rd_le.le_list);
 500                 sdp->sd_log_num_rg--;
 501
 502                 gfs2_rgrp_repolish_clones(rgd);
 503                 gfs2_rgrp_bh_put(rgd);
 504         }
 505         gfs2_assert_warn(sdp, !sdp->sd_log_num_rg);
 506 }
 507
 508 /**
 509  * databuf_lo_add - Add a databuf to the transaction.
 510  *
 511  * This is used in two distinct cases:
 512  * i) In ordered write mode
 513  *    We put the data buffer on a list so that we can ensure that its
 514  *    synced to disk at the right time
 515  * ii) In journaled data mode
 516  *    We need to journal the data block in the same way as metadata in
 517  *    the functions above. The difference is that here we have a tag
 518  *    which is two __be64's being the block number (as per meta data)
 519  *    and a flag which says whether the data block needs escaping or
 520  *    not. This means we need a new log entry for each 251 or so data
 521  *    blocks, which isn't an enormous overhead but twice as much as
 522  *    for normal metadata blocks.
 523  */
 524 static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 525 {
 526         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
 527         struct gfs2_trans *tr = current->journal_info;
 528         struct address_space *mapping = bd->bd_bh->b_page->mapping;
 529         struct gfs2_inode *ip = GFS2_I(mapping->host);
 530
 531         lock_buffer(bd->bd_bh);
 532         gfs2_log_lock(sdp);
 533         if (tr) {
 534                 if (!list_empty(&bd->bd_list_tr))
 535                         goto out;
 536                 tr->tr_touched = 1;
 537                 if (gfs2_is_jdata(ip)) {
 538                         tr->tr_num_buf++;
 539                         list_add(&bd->bd_list_tr, &tr->tr_list_buf);
 540                 }
 541         }
 542         if (!list_empty(&le->le_list))
 543                 goto out;
 544
 545         set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 546         set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 547         if (gfs2_is_jdata(ip)) {
 548                 gfs2_pin(sdp, bd->bd_bh);
 549                 tr->tr_num_databuf_new++;
 550                 sdp->sd_log_num_databuf++;
 551                 list_add_tail(&le->le_list, &sdp->sd_log_le_databuf);
 552         } else {
 553                 list_add_tail(&le->le_list, &sdp->sd_log_le_ordered);
 554         }
 555 out:
 556         gfs2_log_unlock(sdp);
 557         unlock_buffer(bd->bd_bh);
 558 }
 559
 560 static void gfs2_check_magic(struct buffer_head *bh)
 561 {
 562         void *kaddr;
 563         __be32 *ptr;
 564
 565         clear_buffer_escaped(bh);
 566         kaddr = kmap_atomic(bh->b_page, KM_USER0);
 567         ptr = kaddr + bh_offset(bh);
 568         if (*ptr == cpu_to_be32(GFS2_MAGIC))
 569                 set_buffer_escaped(bh);
 570         kunmap_atomic(kaddr, KM_USER0);
 571 }
 572
 573 static void gfs2_write_blocks(struct gfs2_sbd *sdp, struct buffer_head *bh,
 574                               struct list_head *list, struct list_head *done,
 575                               unsigned int n)
 576 {
 577         struct buffer_head *bh1;
 578         struct gfs2_log_descriptor *ld;
 579         struct gfs2_bufdata *bd;
 580         __be64 *ptr;
 581
 582         if (!bh)
 583                 return;
 584
 585         ld = bh_log_desc(bh);
 586         ld->ld_length = cpu_to_be32(n + 1);
 587         ld->ld_data1 = cpu_to_be32(n);
 588
 589         ptr = bh_log_ptr(bh);
 590
 591         get_bh(bh);
 592         submit_bh(WRITE_SYNC, bh);
 593         gfs2_log_lock(sdp);
 594         while(!list_empty(list)) {
 595                 bd = list_entry(list->next, struct gfs2_bufdata, bd_le.le_list);
 596                 list_move_tail(&bd->bd_le.le_list, done);
 597                 get_bh(bd->bd_bh);
 598                 while (be64_to_cpu(*ptr) != bd->bd_bh->b_blocknr) {
 599                         gfs2_log_incr_head(sdp);
 600                         ptr += 2;
 601                 }
 602                 gfs2_log_unlock(sdp);
 603                 lock_buffer(bd->bd_bh);
 604                 if (buffer_escaped(bd->bd_bh)) {
 605                         void *kaddr;
 606                         bh1 = gfs2_log_get_buf(sdp);
 607                         kaddr = kmap_atomic(bd->bd_bh->b_page, KM_USER0);
 608                         memcpy(bh1->b_data, kaddr + bh_offset(bd->bd_bh),
 609                                bh1->b_size);
 610                         kunmap_atomic(kaddr, KM_USER0);
 611                         *(__be32 *)bh1->b_data = 0;
 612                         clear_buffer_escaped(bd->bd_bh);
 613                         unlock_buffer(bd->bd_bh);
 614                         brelse(bd->bd_bh);
 615                 } else {
 616                         bh1 = gfs2_log_fake_buf(sdp, bd->bd_bh);
 617                 }
 618                 submit_bh(WRITE_SYNC, bh1);
 619                 gfs2_log_lock(sdp);
 620                 ptr += 2;
 621         }
 622         gfs2_log_unlock(sdp);
 623         brelse(bh);
 624 }
 625
 626 /**
 627  * databuf_lo_before_commit - Scan the data buffers, writing as we go
 628  *
 629  */
 630
 631 static void databuf_lo_before_commit(struct gfs2_sbd *sdp)
 632 {
 633         struct gfs2_bufdata *bd = NULL;
 634         struct buffer_head *bh = NULL;
 635         unsigned int n = 0;
 636         __be64 *ptr = NULL, *end = NULL;
 637         LIST_HEAD(processed);
 638         LIST_HEAD(in_progress);
 639
 640         gfs2_log_lock(sdp);
 641         while (!list_empty(&sdp->sd_log_le_databuf)) {
 642                 if (ptr == end) {
 643                         gfs2_log_unlock(sdp);
 644                         gfs2_write_blocks(sdp, bh, &in_progress, &processed, n);
 645                         n = 0;
 646                         bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_JDATA);
 647                         ptr = bh_log_ptr(bh);
 648                         end = bh_ptr_end(bh) - 1;
 649                         gfs2_log_lock(sdp);
 650                         continue;
 651                 }
 652                 bd = list_entry(sdp->sd_log_le_databuf.next, struct gfs2_bufdata, bd_le.le_list);
 653                 list_move_tail(&bd->bd_le.le_list, &in_progress);
 654                 gfs2_check_magic(bd->bd_bh);
 655                 *ptr++ = cpu_to_be64(bd->bd_bh->b_blocknr);
 656                 *ptr++ = cpu_to_be64(buffer_escaped(bh) ? 1 : 0);
 657                 n++;
 658         }
 659         gfs2_log_unlock(sdp);
 660         gfs2_write_blocks(sdp, bh, &in_progress, &processed, n);
 661         gfs2_log_lock(sdp);
 662         list_splice(&processed, &sdp->sd_log_le_databuf);
 663         gfs2_log_unlock(sdp);
 664 }
 665
 666 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 667                                     struct gfs2_log_descriptor *ld,
 668                                     __be64 *ptr, int pass)
 669 {
 670         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 671         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 672         struct gfs2_glock *gl = ip->i_gl;
 673         unsigned int blks = be32_to_cpu(ld->ld_data1);
 674         struct buffer_head *bh_log, *bh_ip;
 675         u64 blkno;
 676         u64 esc;
 677         int error = 0;
 678
 679         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
 680                 return 0;
 681
 682         gfs2_replay_incr_blk(sdp, &start);
 683         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 684                 blkno = be64_to_cpu(*ptr++);
 685                 esc = be64_to_cpu(*ptr++);
 686
 687                 sdp->sd_found_blocks++;
 688
 689                 if (gfs2_revoke_check(sdp, blkno, start))
 690                         continue;
 691
 692                 error = gfs2_replay_read_block(jd, start, &bh_log);
 693                 if (error)
 694                         return error;
 695
 696                 bh_ip = gfs2_meta_new(gl, blkno);
 697                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 698
 699                 /* Unescape */
 700                 if (esc) {
 701                         __be32 *eptr = (__be32 *)bh_ip->b_data;
 702                         *eptr = cpu_to_be32(GFS2_MAGIC);
 703                 }
 704                 mark_buffer_dirty(bh_ip);
 705
 706                 brelse(bh_log);
 707                 brelse(bh_ip);
 708                 if (error)
 709                         break;
 710
 711                 sdp->sd_replayed_blocks++;
 712         }
 713
 714         return error;
 715 }
 716
 717 /* FIXME: sort out accounting for log blocks etc. */
 718
 719 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 720 {
 721         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 722         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 723
 724         if (error) {
 725                 gfs2_meta_sync(ip->i_gl);
 726                 return;
 727         }
 728         if (pass != 1)
 729                 return;
 730
 731         /* data sync? */
 732         gfs2_meta_sync(ip->i_gl);
 733
 734         fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
 735                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
 736 }
 737
 738 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 739 {
 740         struct list_head *head = &sdp->sd_log_le_databuf;
 741         struct gfs2_bufdata *bd;
 742
 743         while (!list_empty(head)) {
 744                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 745                 list_del_init(&bd->bd_le.le_list);
 746                 sdp->sd_log_num_databuf--;
 747                 gfs2_unpin(sdp, bd->bd_bh, ai);
 748         }
 749         gfs2_assert_warn(sdp, !sdp->sd_log_num_databuf);
 750 }
 751
 752
 753 const struct gfs2_log_operations gfs2_buf_lops = {
 754         .lo_add = buf_lo_add,
 755         .lo_before_commit = buf_lo_before_commit,
 756         .lo_after_commit = buf_lo_after_commit,
 757         .lo_before_scan = buf_lo_before_scan,
 758         .lo_scan_elements = buf_lo_scan_elements,
 759         .lo_after_scan = buf_lo_after_scan,
 760         .lo_name = "buf",
 761 };
 762
 763 const struct gfs2_log_operations gfs2_revoke_lops = {
 764         .lo_add = revoke_lo_add,
 765         .lo_before_commit = revoke_lo_before_commit,
 766         .lo_after_commit = revoke_lo_after_commit,
 767         .lo_before_scan = revoke_lo_before_scan,
 768         .lo_scan_elements = revoke_lo_scan_elements,
 769         .lo_after_scan = revoke_lo_after_scan,
 770         .lo_name = "revoke",
 771 };
 772
 773 const struct gfs2_log_operations gfs2_rg_lops = {
 774         .lo_add = rg_lo_add,
 775         .lo_after_commit = rg_lo_after_commit,
 776         .lo_name = "rg",
 777 };
 778
 779 const struct gfs2_log_operations gfs2_databuf_lops = {
 780         .lo_add = databuf_lo_add,
 781         .lo_before_commit = databuf_lo_before_commit,
 782         .lo_after_commit = databuf_lo_after_commit,
 783         .lo_scan_elements = databuf_lo_scan_elements,
 784         .lo_after_scan = databuf_lo_after_scan,
 785         .lo_name = "databuf",
 786 };
 787
 788 const struct gfs2_log_operations *gfs2_log_ops[] = {
 789         &gfs2_databuf_lops,
 790         &gfs2_buf_lops,
 791         &gfs2_rg_lops,
 792         &gfs2_revoke_lops,
 793         NULL,
 794 };
 795