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