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