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