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