git.oblomov.eu Git - linux-2.6/blob - 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
  17 #include "gfs2.h"
  18 #include "incore.h"
  19 #include "inode.h"
  20 #include "glock.h"
  21 #include "log.h"
  22 #include "lops.h"
  23 #include "meta_io.h"
  24 #include "recovery.h"
  25 #include "rgrp.h"
  26 #include "trans.h"
  27 #include "util.h"
  28
  29 /**
  30  * gfs2_pin - Pin a buffer in memory
  31  * @sdp: The superblock
  32  * @bh: The buffer to be pinned
  33  *
  34  * The log lock must be held when calling this function
  35  */
  36 static void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
  37 {
  38         struct gfs2_bufdata *bd;
  39
  40         gfs2_assert_withdraw(sdp, test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags));
  41
  42         clear_buffer_dirty(bh);
  43         if (test_set_buffer_pinned(bh))
  44                 gfs2_assert_withdraw(sdp, 0);
  45         if (!buffer_uptodate(bh))
  46                 gfs2_io_error_bh(sdp, bh);
  47         bd = bh->b_private;
  48         /* If this buffer is in the AIL and it has already been written
  49          * to in-place disk block, remove it from the AIL.
  50          */
  51         if (bd->bd_ail)
  52                 list_move(&bd->bd_ail_st_list, &bd->bd_ail->ai_ail2_list);
  53         get_bh(bh);
  54 }
  55
  56 /**
  57  * gfs2_unpin - Unpin a buffer
  58  * @sdp: the filesystem the buffer belongs to
  59  * @bh: The buffer to unpin
  60  * @ai:
  61  *
  62  */
  63
  64 static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
  65                        struct gfs2_ail *ai)
  66 {
  67         struct gfs2_bufdata *bd = bh->b_private;
  68
  69         gfs2_assert_withdraw(sdp, buffer_uptodate(bh));
  70
  71         if (!buffer_pinned(bh))
  72                 gfs2_assert_withdraw(sdp, 0);
  73
  74         lock_buffer(bh);
  75         mark_buffer_dirty(bh);
  76         clear_buffer_pinned(bh);
  77
  78         gfs2_log_lock(sdp);
  79         if (bd->bd_ail) {
  80                 list_del(&bd->bd_ail_st_list);
  81                 brelse(bh);
  82         } else {
  83                 struct gfs2_glock *gl = bd->bd_gl;
  84                 list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
  85                 atomic_inc(&gl->gl_ail_count);
  86         }
  87         bd->bd_ail = ai;
  88         list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list);
  89         clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
  90         gfs2_log_unlock(sdp);
  91         unlock_buffer(bh);
  92 }
  93
  94
  95 static inline struct gfs2_log_descriptor *bh_log_desc(struct buffer_head *bh)
  96 {
  97         return (struct gfs2_log_descriptor *)bh->b_data;
  98 }
  99
 100 static inline __be64 *bh_log_ptr(struct buffer_head *bh)
 101 {
 102         struct gfs2_log_descriptor *ld = bh_log_desc(bh);
 103         return (__force __be64 *)(ld + 1);
 104 }
 105
 106 static inline __be64 *bh_ptr_end(struct buffer_head *bh)
 107 {
 108         return (__force __be64 *)(bh->b_data + bh->b_size);
 109 }
 110
 111
 112 static struct buffer_head *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type)
 113 {
 114         struct buffer_head *bh = gfs2_log_get_buf(sdp);
 115         struct gfs2_log_descriptor *ld = bh_log_desc(bh);
 116         ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 117         ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
 118         ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
 119         ld->ld_type = cpu_to_be32(ld_type);
 120         ld->ld_length = 0;
 121         ld->ld_data1 = 0;
 122         ld->ld_data2 = 0;
 123         memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
 124         return bh;
 125 }
 126
 127 static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 128 {
 129         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
 130         struct gfs2_trans *tr;
 131
 132         lock_buffer(bd->bd_bh);
 133         gfs2_log_lock(sdp);
 134         if (!list_empty(&bd->bd_list_tr))
 135                 goto out;
 136         tr = current->journal_info;
 137         tr->tr_touched = 1;
 138         tr->tr_num_buf++;
 139         list_add(&bd->bd_list_tr, &tr->tr_list_buf);
 140         if (!list_empty(&le->le_list))
 141                 goto out;
 142         set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 143         set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 144         gfs2_meta_check(sdp, bd->bd_bh);
 145         gfs2_pin(sdp, bd->bd_bh);
 146         sdp->sd_log_num_buf++;
 147         list_add(&le->le_list, &sdp->sd_log_le_buf);
 148         tr->tr_num_buf_new++;
 149 out:
 150         gfs2_log_unlock(sdp);
 151         unlock_buffer(bd->bd_bh);
 152 }
 153
 154 static void buf_lo_before_commit(struct gfs2_sbd *sdp)
 155 {
 156         struct buffer_head *bh;
 157         struct gfs2_log_descriptor *ld;
 158         struct gfs2_bufdata *bd1 = NULL, *bd2;
 159         unsigned int total;
 160         unsigned int limit;
 161         unsigned int num;
 162         unsigned n;
 163         __be64 *ptr;
 164
 165         limit = buf_limit(sdp);
 166         /* for 4k blocks, limit = 503 */
 167
 168         gfs2_log_lock(sdp);
 169         total = sdp->sd_log_num_buf;
 170         bd1 = bd2 = list_prepare_entry(bd1, &sdp->sd_log_le_buf, bd_le.le_list);
 171         while(total) {
 172                 num = total;
 173                 if (total > limit)
 174                         num = limit;
 175                 gfs2_log_unlock(sdp);
 176                 bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_METADATA);
 177                 gfs2_log_lock(sdp);
 178                 ld = bh_log_desc(bh);
 179                 ptr = bh_log_ptr(bh);
 180                 ld->ld_length = cpu_to_be32(num + 1);
 181                 ld->ld_data1 = cpu_to_be32(num);
 182
 183                 n = 0;
 184                 list_for_each_entry_continue(bd1, &sdp->sd_log_le_buf,
 185                                              bd_le.le_list) {
 186                         *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
 187                         if (++n >= num)
 188                                 break;
 189                 }
 190
 191                 gfs2_log_unlock(sdp);
 192                 submit_bh(WRITE, bh);
 193                 gfs2_log_lock(sdp);
 194
 195                 n = 0;
 196                 list_for_each_entry_continue(bd2, &sdp->sd_log_le_buf,
 197                                              bd_le.le_list) {
 198                         get_bh(bd2->bd_bh);
 199                         gfs2_log_unlock(sdp);
 200                         lock_buffer(bd2->bd_bh);
 201                         bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
 202                         submit_bh(WRITE, bh);
 203                         gfs2_log_lock(sdp);
 204                         if (++n >= num)
 205                                 break;
 206                 }
 207
 208                 BUG_ON(total < num);
 209                 total -= num;
 210         }
 211         gfs2_log_unlock(sdp);
 212 }
 213
 214 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 215 {
 216         struct list_head *head = &sdp->sd_log_le_buf;
 217         struct gfs2_bufdata *bd;
 218
 219         while (!list_empty(head)) {
 220                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 221                 list_del_init(&bd->bd_le.le_list);
 222                 sdp->sd_log_num_buf--;
 223
 224                 gfs2_unpin(sdp, bd->bd_bh, ai);
 225         }
 226         gfs2_assert_warn(sdp, !sdp->sd_log_num_buf);
 227 }
 228
 229 static void buf_lo_before_scan(struct gfs2_jdesc *jd,
 230                                struct gfs2_log_header_host *head, int pass)
 231 {
 232         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 233
 234         if (pass != 0)
 235                 return;
 236
 237         sdp->sd_found_blocks = 0;
 238         sdp->sd_replayed_blocks = 0;
 239 }
 240
 241 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 242                                 struct gfs2_log_descriptor *ld, __be64 *ptr,
 243                                 int pass)
 244 {
 245         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 246         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 247         struct gfs2_glock *gl = ip->i_gl;
 248         unsigned int blks = be32_to_cpu(ld->ld_data1);
 249         struct buffer_head *bh_log, *bh_ip;
 250         u64 blkno;
 251         int error = 0;
 252
 253         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
 254                 return 0;
 255
 256         gfs2_replay_incr_blk(sdp, &start);
 257
 258         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 259                 blkno = be64_to_cpu(*ptr++);
 260
 261                 sdp->sd_found_blocks++;
 262
 263                 if (gfs2_revoke_check(sdp, blkno, start))
 264                         continue;
 265
 266                 error = gfs2_replay_read_block(jd, start, &bh_log);
 267                 if (error)
 268                         return error;
 269
 270                 bh_ip = gfs2_meta_new(gl, blkno);
 271                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 272
 273                 if (gfs2_meta_check(sdp, bh_ip))
 274                         error = -EIO;
 275                 else
 276                         mark_buffer_dirty(bh_ip);
 277
 278                 brelse(bh_log);
 279                 brelse(bh_ip);
 280
 281                 if (error)
 282                         break;
 283
 284                 sdp->sd_replayed_blocks++;
 285         }
 286
 287         return error;
 288 }
 289
 290 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 291 {
 292         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 293         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 294
 295         if (error) {
 296                 gfs2_meta_sync(ip->i_gl);
 297                 return;
 298         }
 299         if (pass != 1)
 300                 return;
 301
 302         gfs2_meta_sync(ip->i_gl);
 303
 304         fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
 305                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
 306 }
 307
 308 static void revoke_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 309 {
 310         struct gfs2_trans *tr;
 311
 312         tr = current->journal_info;
 313         tr->tr_touched = 1;
 314         tr->tr_num_revoke++;
 315         sdp->sd_log_num_revoke++;
 316         list_add(&le->le_list, &sdp->sd_log_le_revoke);
 317 }
 318
 319 static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
 320 {
 321         struct gfs2_log_descriptor *ld;
 322         struct gfs2_meta_header *mh;
 323         struct buffer_head *bh;
 324         unsigned int offset;
 325         struct list_head *head = &sdp->sd_log_le_revoke;
 326         struct gfs2_bufdata *bd;
 327
 328         if (!sdp->sd_log_num_revoke)
 329                 return;
 330
 331         bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE);
 332         ld = bh_log_desc(bh);
 333         ld->ld_length = cpu_to_be32(gfs2_struct2blk(sdp, sdp->sd_log_num_revoke,
 334                                                     sizeof(u64)));
 335         ld->ld_data1 = cpu_to_be32(sdp->sd_log_num_revoke);
 336         offset = sizeof(struct gfs2_log_descriptor);
 337
 338         while (!list_empty(head)) {
 339                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 340                 list_del_init(&bd->bd_le.le_list);
 341                 sdp->sd_log_num_revoke--;
 342
 343                 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
 344                         submit_bh(WRITE, bh);
 345
 346                         bh = gfs2_log_get_buf(sdp);
 347                         mh = (struct gfs2_meta_header *)bh->b_data;
 348                         mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
 349                         mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
 350                         mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
 351                         offset = sizeof(struct gfs2_meta_header);
 352                 }
 353
 354                 *(__be64 *)(bh->b_data + offset) = cpu_to_be64(bd->bd_blkno);
 355                 kmem_cache_free(gfs2_bufdata_cachep, bd);
 356
 357                 offset += sizeof(u64);
 358         }
 359         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
 360
 361         submit_bh(WRITE, bh);
 362 }
 363
 364 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
 365                                   struct gfs2_log_header_host *head, int pass)
 366 {
 367         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 368
 369         if (pass != 0)
 370                 return;
 371
 372         sdp->sd_found_revokes = 0;
 373         sdp->sd_replay_tail = head->lh_tail;
 374 }
 375
 376 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 377                                    struct gfs2_log_descriptor *ld, __be64 *ptr,
 378                                    int pass)
 379 {
 380         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 381         unsigned int blks = be32_to_cpu(ld->ld_length);
 382         unsigned int revokes = be32_to_cpu(ld->ld_data1);
 383         struct buffer_head *bh;
 384         unsigned int offset;
 385         u64 blkno;
 386         int first = 1;
 387         int error;
 388
 389         if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
 390                 return 0;
 391
 392         offset = sizeof(struct gfs2_log_descriptor);
 393
 394         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 395                 error = gfs2_replay_read_block(jd, start, &bh);
 396                 if (error)
 397                         return error;
 398
 399                 if (!first)
 400                         gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
 401
 402                 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
 403                         blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
 404
 405                         error = gfs2_revoke_add(sdp, blkno, start);
 406                         if (error < 0) {
 407                                 brelse(bh);
 408                                 return error;
 409                         }
 410                         else if (error)
 411                                 sdp->sd_found_revokes++;
 412
 413                         if (!--revokes)
 414                                 break;
 415                         offset += sizeof(u64);
 416                 }
 417
 418                 brelse(bh);
 419                 offset = sizeof(struct gfs2_meta_header);
 420                 first = 0;
 421         }
 422
 423         return 0;
 424 }
 425
 426 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 427 {
 428         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 429
 430         if (error) {
 431                 gfs2_revoke_clean(sdp);
 432                 return;
 433         }
 434         if (pass != 1)
 435                 return;
 436
 437         fs_info(sdp, "jid=%u: Found %u revoke tags\n",
 438                 jd->jd_jid, sdp->sd_found_revokes);
 439
 440         gfs2_revoke_clean(sdp);
 441 }
 442
 443 static void rg_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 444 {
 445         struct gfs2_rgrpd *rgd;
 446         struct gfs2_trans *tr = current->journal_info;
 447
 448         tr->tr_touched = 1;
 449
 450         rgd = container_of(le, struct gfs2_rgrpd, rd_le);
 451
 452         gfs2_log_lock(sdp);
 453         if (!list_empty(&le->le_list)){
 454                 gfs2_log_unlock(sdp);
 455                 return;
 456         }
 457         gfs2_rgrp_bh_hold(rgd);
 458         sdp->sd_log_num_rg++;
 459         list_add(&le->le_list, &sdp->sd_log_le_rg);
 460         gfs2_log_unlock(sdp);
 461 }
 462
 463 static void rg_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 464 {
 465         struct list_head *head = &sdp->sd_log_le_rg;
 466         struct gfs2_rgrpd *rgd;
 467
 468         while (!list_empty(head)) {
 469                 rgd = list_entry(head->next, struct gfs2_rgrpd, rd_le.le_list);
 470                 list_del_init(&rgd->rd_le.le_list);
 471                 sdp->sd_log_num_rg--;
 472
 473                 gfs2_rgrp_repolish_clones(rgd);
 474                 gfs2_rgrp_bh_put(rgd);
 475         }
 476         gfs2_assert_warn(sdp, !sdp->sd_log_num_rg);
 477 }
 478
 479 /**
 480  * databuf_lo_add - Add a databuf to the transaction.
 481  *
 482  * This is used in two distinct cases:
 483  * i) In ordered write mode
 484  *    We put the data buffer on a list so that we can ensure that its
 485  *    synced to disk at the right time
 486  * ii) In journaled data mode
 487  *    We need to journal the data block in the same way as metadata in
 488  *    the functions above. The difference is that here we have a tag
 489  *    which is two __be64's being the block number (as per meta data)
 490  *    and a flag which says whether the data block needs escaping or
 491  *    not. This means we need a new log entry for each 251 or so data
 492  *    blocks, which isn't an enormous overhead but twice as much as
 493  *    for normal metadata blocks.
 494  */
 495 static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 496 {
 497         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
 498         struct gfs2_trans *tr = current->journal_info;
 499         struct address_space *mapping = bd->bd_bh->b_page->mapping;
 500         struct gfs2_inode *ip = GFS2_I(mapping->host);
 501
 502         lock_buffer(bd->bd_bh);
 503         gfs2_log_lock(sdp);
 504         if (tr) {
 505                 if (!list_empty(&bd->bd_list_tr))
 506                         goto out;
 507                 tr->tr_touched = 1;
 508                 if (gfs2_is_jdata(ip)) {
 509                         tr->tr_num_buf++;
 510                         list_add(&bd->bd_list_tr, &tr->tr_list_buf);
 511                 }
 512         }
 513         if (!list_empty(&le->le_list))
 514                 goto out;
 515
 516         set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 517         set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 518         if (gfs2_is_jdata(ip)) {
 519                 gfs2_pin(sdp, bd->bd_bh);
 520                 tr->tr_num_databuf_new++;
 521                 sdp->sd_log_num_databuf++;
 522                 list_add(&le->le_list, &sdp->sd_log_le_databuf);
 523         } else {
 524                 list_add(&le->le_list, &sdp->sd_log_le_ordered);
 525         }
 526 out:
 527         gfs2_log_unlock(sdp);
 528         unlock_buffer(bd->bd_bh);
 529 }
 530
 531 static void gfs2_check_magic(struct buffer_head *bh)
 532 {
 533         void *kaddr;
 534         __be32 *ptr;
 535
 536         clear_buffer_escaped(bh);
 537         kaddr = kmap_atomic(bh->b_page, KM_USER0);
 538         ptr = kaddr + bh_offset(bh);
 539         if (*ptr == cpu_to_be32(GFS2_MAGIC))
 540                 set_buffer_escaped(bh);
 541         kunmap_atomic(kaddr, KM_USER0);
 542 }
 543
 544 static void gfs2_write_blocks(struct gfs2_sbd *sdp, struct buffer_head *bh,
 545                               struct list_head *list, struct list_head *done,
 546                               unsigned int n)
 547 {
 548         struct buffer_head *bh1;
 549         struct gfs2_log_descriptor *ld;
 550         struct gfs2_bufdata *bd;
 551         __be64 *ptr;
 552
 553         if (!bh)
 554                 return;
 555
 556         ld = bh_log_desc(bh);
 557         ld->ld_length = cpu_to_be32(n + 1);
 558         ld->ld_data1 = cpu_to_be32(n);
 559
 560         ptr = bh_log_ptr(bh);
 561
 562         get_bh(bh);
 563         submit_bh(WRITE, bh);
 564         gfs2_log_lock(sdp);
 565         while(!list_empty(list)) {
 566                 bd = list_entry(list->next, struct gfs2_bufdata, bd_le.le_list);
 567                 list_move_tail(&bd->bd_le.le_list, done);
 568                 get_bh(bd->bd_bh);
 569                 while (be64_to_cpu(*ptr) != bd->bd_bh->b_blocknr) {
 570                         gfs2_log_incr_head(sdp);
 571                         ptr += 2;
 572                 }
 573                 gfs2_log_unlock(sdp);
 574                 lock_buffer(bd->bd_bh);
 575                 if (buffer_escaped(bd->bd_bh)) {
 576                         void *kaddr;
 577                         bh1 = gfs2_log_get_buf(sdp);
 578                         kaddr = kmap_atomic(bd->bd_bh->b_page, KM_USER0);
 579                         memcpy(bh1->b_data, kaddr + bh_offset(bd->bd_bh),
 580                                bh1->b_size);
 581                         kunmap_atomic(kaddr, KM_USER0);
 582                         *(__be32 *)bh1->b_data = 0;
 583                         clear_buffer_escaped(bd->bd_bh);
 584                         unlock_buffer(bd->bd_bh);
 585                         brelse(bd->bd_bh);
 586                 } else {
 587                         bh1 = gfs2_log_fake_buf(sdp, bd->bd_bh);
 588                 }
 589                 submit_bh(WRITE, bh1);
 590                 gfs2_log_lock(sdp);
 591                 ptr += 2;
 592         }
 593         gfs2_log_unlock(sdp);
 594         brelse(bh);
 595 }
 596
 597 /**
 598  * databuf_lo_before_commit - Scan the data buffers, writing as we go
 599  *
 600  */
 601
 602 static void databuf_lo_before_commit(struct gfs2_sbd *sdp)
 603 {
 604         struct gfs2_bufdata *bd = NULL;
 605         struct buffer_head *bh = NULL;
 606         unsigned int n = 0;
 607         __be64 *ptr = NULL, *end = NULL;
 608         LIST_HEAD(processed);
 609         LIST_HEAD(in_progress);
 610
 611         gfs2_log_lock(sdp);
 612         while (!list_empty(&sdp->sd_log_le_databuf)) {
 613                 if (ptr == end) {
 614                         gfs2_log_unlock(sdp);
 615                         gfs2_write_blocks(sdp, bh, &in_progress, &processed, n);
 616                         n = 0;
 617                         bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_JDATA);
 618                         ptr = bh_log_ptr(bh);
 619                         end = bh_ptr_end(bh) - 1;
 620                         gfs2_log_lock(sdp);
 621                         continue;
 622                 }
 623                 bd = list_entry(sdp->sd_log_le_databuf.next, struct gfs2_bufdata, bd_le.le_list);
 624                 list_move_tail(&bd->bd_le.le_list, &in_progress);
 625                 gfs2_check_magic(bd->bd_bh);
 626                 *ptr++ = cpu_to_be64(bd->bd_bh->b_blocknr);
 627                 *ptr++ = cpu_to_be64(buffer_escaped(bh) ? 1 : 0);
 628                 n++;
 629         }
 630         gfs2_log_unlock(sdp);
 631         gfs2_write_blocks(sdp, bh, &in_progress, &processed, n);
 632         gfs2_log_lock(sdp);
 633         list_splice(&processed, &sdp->sd_log_le_databuf);
 634         gfs2_log_unlock(sdp);
 635 }
 636
 637 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 638                                     struct gfs2_log_descriptor *ld,
 639                                     __be64 *ptr, int pass)
 640 {
 641         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 642         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 643         struct gfs2_glock *gl = ip->i_gl;
 644         unsigned int blks = be32_to_cpu(ld->ld_data1);
 645         struct buffer_head *bh_log, *bh_ip;
 646         u64 blkno;
 647         u64 esc;
 648         int error = 0;
 649
 650         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
 651                 return 0;
 652
 653         gfs2_replay_incr_blk(sdp, &start);
 654         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 655                 blkno = be64_to_cpu(*ptr++);
 656                 esc = be64_to_cpu(*ptr++);
 657
 658                 sdp->sd_found_blocks++;
 659
 660                 if (gfs2_revoke_check(sdp, blkno, start))
 661                         continue;
 662
 663                 error = gfs2_replay_read_block(jd, start, &bh_log);
 664                 if (error)
 665                         return error;
 666
 667                 bh_ip = gfs2_meta_new(gl, blkno);
 668                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 669
 670                 /* Unescape */
 671                 if (esc) {
 672                         __be32 *eptr = (__be32 *)bh_ip->b_data;
 673                         *eptr = cpu_to_be32(GFS2_MAGIC);
 674                 }
 675                 mark_buffer_dirty(bh_ip);
 676
 677                 brelse(bh_log);
 678                 brelse(bh_ip);
 679                 if (error)
 680                         break;
 681
 682                 sdp->sd_replayed_blocks++;
 683         }
 684
 685         return error;
 686 }
 687
 688 /* FIXME: sort out accounting for log blocks etc. */
 689
 690 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 691 {
 692         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 693         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 694
 695         if (error) {
 696                 gfs2_meta_sync(ip->i_gl);
 697                 return;
 698         }
 699         if (pass != 1)
 700                 return;
 701
 702         /* data sync? */
 703         gfs2_meta_sync(ip->i_gl);
 704
 705         fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
 706                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
 707 }
 708
 709 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 710 {
 711         struct list_head *head = &sdp->sd_log_le_databuf;
 712         struct gfs2_bufdata *bd;
 713
 714         while (!list_empty(head)) {
 715                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 716                 list_del_init(&bd->bd_le.le_list);
 717                 sdp->sd_log_num_databuf--;
 718                 gfs2_unpin(sdp, bd->bd_bh, ai);
 719         }
 720         gfs2_assert_warn(sdp, !sdp->sd_log_num_databuf);
 721 }
 722
 723
 724 const struct gfs2_log_operations gfs2_buf_lops = {
 725         .lo_add = buf_lo_add,
 726         .lo_before_commit = buf_lo_before_commit,
 727         .lo_after_commit = buf_lo_after_commit,
 728         .lo_before_scan = buf_lo_before_scan,
 729         .lo_scan_elements = buf_lo_scan_elements,
 730         .lo_after_scan = buf_lo_after_scan,
 731         .lo_name = "buf",
 732 };
 733
 734 const struct gfs2_log_operations gfs2_revoke_lops = {
 735         .lo_add = revoke_lo_add,
 736         .lo_before_commit = revoke_lo_before_commit,
 737         .lo_before_scan = revoke_lo_before_scan,
 738         .lo_scan_elements = revoke_lo_scan_elements,
 739         .lo_after_scan = revoke_lo_after_scan,
 740         .lo_name = "revoke",
 741 };
 742
 743 const struct gfs2_log_operations gfs2_rg_lops = {
 744         .lo_add = rg_lo_add,
 745         .lo_after_commit = rg_lo_after_commit,
 746         .lo_name = "rg",
 747 };
 748
 749 const struct gfs2_log_operations gfs2_databuf_lops = {
 750         .lo_add = databuf_lo_add,
 751         .lo_before_commit = databuf_lo_before_commit,
 752         .lo_after_commit = databuf_lo_after_commit,
 753         .lo_scan_elements = databuf_lo_scan_elements,
 754         .lo_after_scan = databuf_lo_after_scan,
 755         .lo_name = "databuf",
 756 };
 757
 758 const struct gfs2_log_operations *gfs2_log_ops[] = {
 759         &gfs2_databuf_lops,
 760         &gfs2_buf_lops,
 761         &gfs2_rg_lops,
 762         &gfs2_revoke_lops,
 763         NULL,
 764 };
 765