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         spin_lock(&sdp->sd_ail_lock);
  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         spin_unlock(&sdp->sd_ail_lock);
  95
  96         if (test_and_clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags))
  97                 gfs2_glock_schedule_for_reclaim(bd->bd_gl);
  98         trace_gfs2_pin(bd, 0);
  99         unlock_buffer(bh);
 100         atomic_dec(&sdp->sd_log_pinned);
 101 }
 102
 103
 104 static inline struct gfs2_log_descriptor *bh_log_desc(struct buffer_head *bh)
 105 {
 106         return (struct gfs2_log_descriptor *)bh->b_data;
 107 }
 108
 109 static inline __be64 *bh_log_ptr(struct buffer_head *bh)
 110 {
 111         struct gfs2_log_descriptor *ld = bh_log_desc(bh);
 112         return (__force __be64 *)(ld + 1);
 113 }
 114
 115 static inline __be64 *bh_ptr_end(struct buffer_head *bh)
 116 {
 117         return (__force __be64 *)(bh->b_data + bh->b_size);
 118 }
 119
 120
 121 static struct buffer_head *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type)
 122 {
 123         struct buffer_head *bh = gfs2_log_get_buf(sdp);
 124         struct gfs2_log_descriptor *ld = bh_log_desc(bh);
 125         ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 126         ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
 127         ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
 128         ld->ld_type = cpu_to_be32(ld_type);
 129         ld->ld_length = 0;
 130         ld->ld_data1 = 0;
 131         ld->ld_data2 = 0;
 132         memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
 133         return bh;
 134 }
 135
 136 static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 137 {
 138         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
 139         struct gfs2_meta_header *mh;
 140         struct gfs2_trans *tr;
 141
 142         lock_buffer(bd->bd_bh);
 143         gfs2_log_lock(sdp);
 144         if (!list_empty(&bd->bd_list_tr))
 145                 goto out;
 146         tr = current->journal_info;
 147         tr->tr_touched = 1;
 148         tr->tr_num_buf++;
 149         list_add(&bd->bd_list_tr, &tr->tr_list_buf);
 150         if (!list_empty(&le->le_list))
 151                 goto out;
 152         set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 153         set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 154         gfs2_meta_check(sdp, bd->bd_bh);
 155         gfs2_pin(sdp, bd->bd_bh);
 156         mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
 157         mh->__pad0 = cpu_to_be64(0);
 158         mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
 159         sdp->sd_log_num_buf++;
 160         list_add(&le->le_list, &sdp->sd_log_le_buf);
 161         tr->tr_num_buf_new++;
 162 out:
 163         gfs2_log_unlock(sdp);
 164         unlock_buffer(bd->bd_bh);
 165 }
 166
 167 static void buf_lo_before_commit(struct gfs2_sbd *sdp)
 168 {
 169         struct buffer_head *bh;
 170         struct gfs2_log_descriptor *ld;
 171         struct gfs2_bufdata *bd1 = NULL, *bd2;
 172         unsigned int total;
 173         unsigned int limit;
 174         unsigned int num;
 175         unsigned n;
 176         __be64 *ptr;
 177
 178         limit = buf_limit(sdp);
 179         /* for 4k blocks, limit = 503 */
 180
 181         gfs2_log_lock(sdp);
 182         total = sdp->sd_log_num_buf;
 183         bd1 = bd2 = list_prepare_entry(bd1, &sdp->sd_log_le_buf, bd_le.le_list);
 184         while(total) {
 185                 num = total;
 186                 if (total > limit)
 187                         num = limit;
 188                 gfs2_log_unlock(sdp);
 189                 bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_METADATA);
 190                 gfs2_log_lock(sdp);
 191                 ld = bh_log_desc(bh);
 192                 ptr = bh_log_ptr(bh);
 193                 ld->ld_length = cpu_to_be32(num + 1);
 194                 ld->ld_data1 = cpu_to_be32(num);
 195
 196                 n = 0;
 197                 list_for_each_entry_continue(bd1, &sdp->sd_log_le_buf,
 198                                              bd_le.le_list) {
 199                         *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
 200                         if (++n >= num)
 201                                 break;
 202                 }
 203
 204                 gfs2_log_unlock(sdp);
 205                 submit_bh(WRITE_SYNC_PLUG, bh);
 206                 gfs2_log_lock(sdp);
 207
 208                 n = 0;
 209                 list_for_each_entry_continue(bd2, &sdp->sd_log_le_buf,
 210                                              bd_le.le_list) {
 211                         get_bh(bd2->bd_bh);
 212                         gfs2_log_unlock(sdp);
 213                         lock_buffer(bd2->bd_bh);
 214                         bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
 215                         submit_bh(WRITE_SYNC_PLUG, bh);
 216                         gfs2_log_lock(sdp);
 217                         if (++n >= num)
 218                                 break;
 219                 }
 220
 221                 BUG_ON(total < num);
 222                 total -= num;
 223         }
 224         gfs2_log_unlock(sdp);
 225 }
 226
 227 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 228 {
 229         struct list_head *head = &sdp->sd_log_le_buf;
 230         struct gfs2_bufdata *bd;
 231
 232         while (!list_empty(head)) {
 233                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 234                 list_del_init(&bd->bd_le.le_list);
 235                 sdp->sd_log_num_buf--;
 236
 237                 gfs2_unpin(sdp, bd->bd_bh, ai);
 238         }
 239         gfs2_assert_warn(sdp, !sdp->sd_log_num_buf);
 240 }
 241
 242 static void buf_lo_before_scan(struct gfs2_jdesc *jd,
 243                                struct gfs2_log_header_host *head, int pass)
 244 {
 245         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 246
 247         if (pass != 0)
 248                 return;
 249
 250         sdp->sd_found_blocks = 0;
 251         sdp->sd_replayed_blocks = 0;
 252 }
 253
 254 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 255                                 struct gfs2_log_descriptor *ld, __be64 *ptr,
 256                                 int pass)
 257 {
 258         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 259         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 260         struct gfs2_glock *gl = ip->i_gl;
 261         unsigned int blks = be32_to_cpu(ld->ld_data1);
 262         struct buffer_head *bh_log, *bh_ip;
 263         u64 blkno;
 264         int error = 0;
 265
 266         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
 267                 return 0;
 268
 269         gfs2_replay_incr_blk(sdp, &start);
 270
 271         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 272                 blkno = be64_to_cpu(*ptr++);
 273
 274                 sdp->sd_found_blocks++;
 275
 276                 if (gfs2_revoke_check(sdp, blkno, start))
 277                         continue;
 278
 279                 error = gfs2_replay_read_block(jd, start, &bh_log);
 280                 if (error)
 281                         return error;
 282
 283                 bh_ip = gfs2_meta_new(gl, blkno);
 284                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 285
 286                 if (gfs2_meta_check(sdp, bh_ip))
 287                         error = -EIO;
 288                 else
 289                         mark_buffer_dirty(bh_ip);
 290
 291                 brelse(bh_log);
 292                 brelse(bh_ip);
 293
 294                 if (error)
 295                         break;
 296
 297                 sdp->sd_replayed_blocks++;
 298         }
 299
 300         return error;
 301 }
 302
 303 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 304 {
 305         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 306         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 307
 308         if (error) {
 309                 gfs2_meta_sync(ip->i_gl);
 310                 return;
 311         }
 312         if (pass != 1)
 313                 return;
 314
 315         gfs2_meta_sync(ip->i_gl);
 316
 317         fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
 318                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
 319 }
 320
 321 static void revoke_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 322 {
 323         struct gfs2_trans *tr;
 324
 325         tr = current->journal_info;
 326         tr->tr_touched = 1;
 327         tr->tr_num_revoke++;
 328         sdp->sd_log_num_revoke++;
 329         list_add(&le->le_list, &sdp->sd_log_le_revoke);
 330 }
 331
 332 static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
 333 {
 334         struct gfs2_log_descriptor *ld;
 335         struct gfs2_meta_header *mh;
 336         struct buffer_head *bh;
 337         unsigned int offset;
 338         struct list_head *head = &sdp->sd_log_le_revoke;
 339         struct gfs2_bufdata *bd;
 340
 341         if (!sdp->sd_log_num_revoke)
 342                 return;
 343
 344         bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE);
 345         ld = bh_log_desc(bh);
 346         ld->ld_length = cpu_to_be32(gfs2_struct2blk(sdp, sdp->sd_log_num_revoke,
 347                                                     sizeof(u64)));
 348         ld->ld_data1 = cpu_to_be32(sdp->sd_log_num_revoke);
 349         offset = sizeof(struct gfs2_log_descriptor);
 350
 351         while (!list_empty(head)) {
 352                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 353                 list_del_init(&bd->bd_le.le_list);
 354                 sdp->sd_log_num_revoke--;
 355
 356                 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
 357                         submit_bh(WRITE_SYNC_PLUG, bh);
 358
 359                         bh = gfs2_log_get_buf(sdp);
 360                         mh = (struct gfs2_meta_header *)bh->b_data;
 361                         mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
 362                         mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
 363                         mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
 364                         offset = sizeof(struct gfs2_meta_header);
 365                 }
 366
 367                 *(__be64 *)(bh->b_data + offset) = cpu_to_be64(bd->bd_blkno);
 368                 kmem_cache_free(gfs2_bufdata_cachep, bd);
 369
 370                 offset += sizeof(u64);
 371         }
 372         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
 373
 374         submit_bh(WRITE_SYNC_PLUG, bh);
 375 }
 376
 377 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
 378                                   struct gfs2_log_header_host *head, int pass)
 379 {
 380         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 381
 382         if (pass != 0)
 383                 return;
 384
 385         sdp->sd_found_revokes = 0;
 386         sdp->sd_replay_tail = head->lh_tail;
 387 }
 388
 389 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 390                                    struct gfs2_log_descriptor *ld, __be64 *ptr,
 391                                    int pass)
 392 {
 393         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 394         unsigned int blks = be32_to_cpu(ld->ld_length);
 395         unsigned int revokes = be32_to_cpu(ld->ld_data1);
 396         struct buffer_head *bh;
 397         unsigned int offset;
 398         u64 blkno;
 399         int first = 1;
 400         int error;
 401
 402         if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
 403                 return 0;
 404
 405         offset = sizeof(struct gfs2_log_descriptor);
 406
 407         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 408                 error = gfs2_replay_read_block(jd, start, &bh);
 409                 if (error)
 410                         return error;
 411
 412                 if (!first)
 413                         gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
 414
 415                 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
 416                         blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
 417
 418                         error = gfs2_revoke_add(sdp, blkno, start);
 419                         if (error < 0) {
 420                                 brelse(bh);
 421                                 return error;
 422                         }
 423                         else if (error)
 424                                 sdp->sd_found_revokes++;
 425
 426                         if (!--revokes)
 427                                 break;
 428                         offset += sizeof(u64);
 429                 }
 430
 431                 brelse(bh);
 432                 offset = sizeof(struct gfs2_meta_header);
 433                 first = 0;
 434         }
 435
 436         return 0;
 437 }
 438
 439 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 440 {
 441         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 442
 443         if (error) {
 444                 gfs2_revoke_clean(sdp);
 445                 return;
 446         }
 447         if (pass != 1)
 448                 return;
 449
 450         fs_info(sdp, "jid=%u: Found %u revoke tags\n",
 451                 jd->jd_jid, sdp->sd_found_revokes);
 452
 453         gfs2_revoke_clean(sdp);
 454 }
 455
 456 static void rg_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 457 {
 458         struct gfs2_rgrpd *rgd;
 459         struct gfs2_trans *tr = current->journal_info;
 460
 461         tr->tr_touched = 1;
 462
 463         rgd = container_of(le, struct gfs2_rgrpd, rd_le);
 464
 465         gfs2_log_lock(sdp);
 466         if (!list_empty(&le->le_list)){
 467                 gfs2_log_unlock(sdp);
 468                 return;
 469         }
 470         gfs2_rgrp_bh_hold(rgd);
 471         sdp->sd_log_num_rg++;
 472         list_add(&le->le_list, &sdp->sd_log_le_rg);
 473         gfs2_log_unlock(sdp);
 474 }
 475
 476 static void rg_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 477 {
 478         struct list_head *head = &sdp->sd_log_le_rg;
 479         struct gfs2_rgrpd *rgd;
 480
 481         while (!list_empty(head)) {
 482                 rgd = list_entry(head->next, struct gfs2_rgrpd, rd_le.le_list);
 483                 list_del_init(&rgd->rd_le.le_list);
 484                 sdp->sd_log_num_rg--;
 485
 486                 gfs2_rgrp_repolish_clones(rgd);
 487                 gfs2_rgrp_bh_put(rgd);
 488         }
 489         gfs2_assert_warn(sdp, !sdp->sd_log_num_rg);
 490 }
 491
 492 /**
 493  * databuf_lo_add - Add a databuf to the transaction.
 494  *
 495  * This is used in two distinct cases:
 496  * i) In ordered write mode
 497  *    We put the data buffer on a list so that we can ensure that its
 498  *    synced to disk at the right time
 499  * ii) In journaled data mode
 500  *    We need to journal the data block in the same way as metadata in
 501  *    the functions above. The difference is that here we have a tag
 502  *    which is two __be64's being the block number (as per meta data)
 503  *    and a flag which says whether the data block needs escaping or
 504  *    not. This means we need a new log entry for each 251 or so data
 505  *    blocks, which isn't an enormous overhead but twice as much as
 506  *    for normal metadata blocks.
 507  */
 508 static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 509 {
 510         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
 511         struct gfs2_trans *tr = current->journal_info;
 512         struct address_space *mapping = bd->bd_bh->b_page->mapping;
 513         struct gfs2_inode *ip = GFS2_I(mapping->host);
 514
 515         lock_buffer(bd->bd_bh);
 516         gfs2_log_lock(sdp);
 517         if (tr) {
 518                 if (!list_empty(&bd->bd_list_tr))
 519                         goto out;
 520                 tr->tr_touched = 1;
 521                 if (gfs2_is_jdata(ip)) {
 522                         tr->tr_num_buf++;
 523                         list_add(&bd->bd_list_tr, &tr->tr_list_buf);
 524                 }
 525         }
 526         if (!list_empty(&le->le_list))
 527                 goto out;
 528
 529         set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 530         set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 531         if (gfs2_is_jdata(ip)) {
 532                 gfs2_pin(sdp, bd->bd_bh);
 533                 tr->tr_num_databuf_new++;
 534                 sdp->sd_log_num_databuf++;
 535                 list_add_tail(&le->le_list, &sdp->sd_log_le_databuf);
 536         } else {
 537                 list_add_tail(&le->le_list, &sdp->sd_log_le_ordered);
 538         }
 539 out:
 540         gfs2_log_unlock(sdp);
 541         unlock_buffer(bd->bd_bh);
 542 }
 543
 544 static void gfs2_check_magic(struct buffer_head *bh)
 545 {
 546         void *kaddr;
 547         __be32 *ptr;
 548
 549         clear_buffer_escaped(bh);
 550         kaddr = kmap_atomic(bh->b_page, KM_USER0);
 551         ptr = kaddr + bh_offset(bh);
 552         if (*ptr == cpu_to_be32(GFS2_MAGIC))
 553                 set_buffer_escaped(bh);
 554         kunmap_atomic(kaddr, KM_USER0);
 555 }
 556
 557 static void gfs2_write_blocks(struct gfs2_sbd *sdp, struct buffer_head *bh,
 558                               struct list_head *list, struct list_head *done,
 559                               unsigned int n)
 560 {
 561         struct buffer_head *bh1;
 562         struct gfs2_log_descriptor *ld;
 563         struct gfs2_bufdata *bd;
 564         __be64 *ptr;
 565
 566         if (!bh)
 567                 return;
 568
 569         ld = bh_log_desc(bh);
 570         ld->ld_length = cpu_to_be32(n + 1);
 571         ld->ld_data1 = cpu_to_be32(n);
 572
 573         ptr = bh_log_ptr(bh);
 574
 575         get_bh(bh);
 576         submit_bh(WRITE_SYNC_PLUG, bh);
 577         gfs2_log_lock(sdp);
 578         while(!list_empty(list)) {
 579                 bd = list_entry(list->next, struct gfs2_bufdata, bd_le.le_list);
 580                 list_move_tail(&bd->bd_le.le_list, done);
 581                 get_bh(bd->bd_bh);
 582                 while (be64_to_cpu(*ptr) != bd->bd_bh->b_blocknr) {
 583                         gfs2_log_incr_head(sdp);
 584                         ptr += 2;
 585                 }
 586                 gfs2_log_unlock(sdp);
 587                 lock_buffer(bd->bd_bh);
 588                 if (buffer_escaped(bd->bd_bh)) {
 589                         void *kaddr;
 590                         bh1 = gfs2_log_get_buf(sdp);
 591                         kaddr = kmap_atomic(bd->bd_bh->b_page, KM_USER0);
 592                         memcpy(bh1->b_data, kaddr + bh_offset(bd->bd_bh),
 593                                bh1->b_size);
 594                         kunmap_atomic(kaddr, KM_USER0);
 595                         *(__be32 *)bh1->b_data = 0;
 596                         clear_buffer_escaped(bd->bd_bh);
 597                         unlock_buffer(bd->bd_bh);
 598                         brelse(bd->bd_bh);
 599                 } else {
 600                         bh1 = gfs2_log_fake_buf(sdp, bd->bd_bh);
 601                 }
 602                 submit_bh(WRITE_SYNC_PLUG, bh1);
 603                 gfs2_log_lock(sdp);
 604                 ptr += 2;
 605         }
 606         gfs2_log_unlock(sdp);
 607         brelse(bh);
 608 }
 609
 610 /**
 611  * databuf_lo_before_commit - Scan the data buffers, writing as we go
 612  *
 613  */
 614
 615 static void databuf_lo_before_commit(struct gfs2_sbd *sdp)
 616 {
 617         struct gfs2_bufdata *bd = NULL;
 618         struct buffer_head *bh = NULL;
 619         unsigned int n = 0;
 620         __be64 *ptr = NULL, *end = NULL;
 621         LIST_HEAD(processed);
 622         LIST_HEAD(in_progress);
 623
 624         gfs2_log_lock(sdp);
 625         while (!list_empty(&sdp->sd_log_le_databuf)) {
 626                 if (ptr == end) {
 627                         gfs2_log_unlock(sdp);
 628                         gfs2_write_blocks(sdp, bh, &in_progress, &processed, n);
 629                         n = 0;
 630                         bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_JDATA);
 631                         ptr = bh_log_ptr(bh);
 632                         end = bh_ptr_end(bh) - 1;
 633                         gfs2_log_lock(sdp);
 634                         continue;
 635                 }
 636                 bd = list_entry(sdp->sd_log_le_databuf.next, struct gfs2_bufdata, bd_le.le_list);
 637                 list_move_tail(&bd->bd_le.le_list, &in_progress);
 638                 gfs2_check_magic(bd->bd_bh);
 639                 *ptr++ = cpu_to_be64(bd->bd_bh->b_blocknr);
 640                 *ptr++ = cpu_to_be64(buffer_escaped(bh) ? 1 : 0);
 641                 n++;
 642         }
 643         gfs2_log_unlock(sdp);
 644         gfs2_write_blocks(sdp, bh, &in_progress, &processed, n);
 645         gfs2_log_lock(sdp);
 646         list_splice(&processed, &sdp->sd_log_le_databuf);
 647         gfs2_log_unlock(sdp);
 648 }
 649
 650 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 651                                     struct gfs2_log_descriptor *ld,
 652                                     __be64 *ptr, int pass)
 653 {
 654         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 655         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 656         struct gfs2_glock *gl = ip->i_gl;
 657         unsigned int blks = be32_to_cpu(ld->ld_data1);
 658         struct buffer_head *bh_log, *bh_ip;
 659         u64 blkno;
 660         u64 esc;
 661         int error = 0;
 662
 663         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
 664                 return 0;
 665
 666         gfs2_replay_incr_blk(sdp, &start);
 667         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 668                 blkno = be64_to_cpu(*ptr++);
 669                 esc = be64_to_cpu(*ptr++);
 670
 671                 sdp->sd_found_blocks++;
 672
 673                 if (gfs2_revoke_check(sdp, blkno, start))
 674                         continue;
 675
 676                 error = gfs2_replay_read_block(jd, start, &bh_log);
 677                 if (error)
 678                         return error;
 679
 680                 bh_ip = gfs2_meta_new(gl, blkno);
 681                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 682
 683                 /* Unescape */
 684                 if (esc) {
 685                         __be32 *eptr = (__be32 *)bh_ip->b_data;
 686                         *eptr = cpu_to_be32(GFS2_MAGIC);
 687                 }
 688                 mark_buffer_dirty(bh_ip);
 689
 690                 brelse(bh_log);
 691                 brelse(bh_ip);
 692                 if (error)
 693                         break;
 694
 695                 sdp->sd_replayed_blocks++;
 696         }
 697
 698         return error;
 699 }
 700
 701 /* FIXME: sort out accounting for log blocks etc. */
 702
 703 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 704 {
 705         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 706         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 707
 708         if (error) {
 709                 gfs2_meta_sync(ip->i_gl);
 710                 return;
 711         }
 712         if (pass != 1)
 713                 return;
 714
 715         /* data sync? */
 716         gfs2_meta_sync(ip->i_gl);
 717
 718         fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
 719                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
 720 }
 721
 722 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 723 {
 724         struct list_head *head = &sdp->sd_log_le_databuf;
 725         struct gfs2_bufdata *bd;
 726
 727         while (!list_empty(head)) {
 728                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 729                 list_del_init(&bd->bd_le.le_list);
 730                 sdp->sd_log_num_databuf--;
 731                 gfs2_unpin(sdp, bd->bd_bh, ai);
 732         }
 733         gfs2_assert_warn(sdp, !sdp->sd_log_num_databuf);
 734 }
 735
 736
 737 const struct gfs2_log_operations gfs2_buf_lops = {
 738         .lo_add = buf_lo_add,
 739         .lo_before_commit = buf_lo_before_commit,
 740         .lo_after_commit = buf_lo_after_commit,
 741         .lo_before_scan = buf_lo_before_scan,
 742         .lo_scan_elements = buf_lo_scan_elements,
 743         .lo_after_scan = buf_lo_after_scan,
 744         .lo_name = "buf",
 745 };
 746
 747 const struct gfs2_log_operations gfs2_revoke_lops = {
 748         .lo_add = revoke_lo_add,
 749         .lo_before_commit = revoke_lo_before_commit,
 750         .lo_before_scan = revoke_lo_before_scan,
 751         .lo_scan_elements = revoke_lo_scan_elements,
 752         .lo_after_scan = revoke_lo_after_scan,
 753         .lo_name = "revoke",
 754 };
 755
 756 const struct gfs2_log_operations gfs2_rg_lops = {
 757         .lo_add = rg_lo_add,
 758         .lo_after_commit = rg_lo_after_commit,
 759         .lo_name = "rg",
 760 };
 761
 762 const struct gfs2_log_operations gfs2_databuf_lops = {
 763         .lo_add = databuf_lo_add,
 764         .lo_before_commit = databuf_lo_before_commit,
 765         .lo_after_commit = databuf_lo_after_commit,
 766         .lo_scan_elements = databuf_lo_scan_elements,
 767         .lo_after_scan = databuf_lo_after_scan,
 768         .lo_name = "databuf",
 769 };
 770
 771 const struct gfs2_log_operations *gfs2_log_ops[] = {
 772         &gfs2_databuf_lops,
 773         &gfs2_buf_lops,
 774         &gfs2_rg_lops,
 775         &gfs2_revoke_lops,
 776         NULL,
 777 };
 778