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 "glock.h"
  21 #include "log.h"
  22 #include "lops.h"
  23 #include "meta_io.h"
  24 #include "recovery.h"
  25 #include "rgrp.h"
  26 #include "trans.h"
  27 #include "util.h"
  28
  29 static void glock_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
  30 {
  31         struct gfs2_glock *gl;
  32         struct gfs2_trans *tr = current->journal_info;
  33
  34         tr->tr_touched = 1;
  35
  36         if (!list_empty(&le->le_list))
  37                 return;
  38
  39         gl = container_of(le, struct gfs2_glock, gl_le);
  40         if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(gl)))
  41                 return;
  42         gfs2_glock_hold(gl);
  43         set_bit(GLF_DIRTY, &gl->gl_flags);
  44
  45         gfs2_log_lock(sdp);
  46         sdp->sd_log_num_gl++;
  47         list_add(&le->le_list, &sdp->sd_log_le_gl);
  48         gfs2_log_unlock(sdp);
  49 }
  50
  51 static void glock_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
  52 {
  53         struct list_head *head = &sdp->sd_log_le_gl;
  54         struct gfs2_glock *gl;
  55
  56         while (!list_empty(head)) {
  57                 gl = list_entry(head->next, struct gfs2_glock, gl_le.le_list);
  58                 list_del_init(&gl->gl_le.le_list);
  59                 sdp->sd_log_num_gl--;
  60
  61                 gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(gl));
  62                 gfs2_glock_put(gl);
  63         }
  64         gfs2_assert_warn(sdp, !sdp->sd_log_num_gl);
  65 }
  66
  67 static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
  68 {
  69         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
  70         struct gfs2_trans *tr;
  71
  72         if (!list_empty(&bd->bd_list_tr))
  73                 return;
  74
  75         tr = current->journal_info;
  76         tr->tr_touched = 1;
  77         tr->tr_num_buf++;
  78         list_add(&bd->bd_list_tr, &tr->tr_list_buf);
  79
  80         if (!list_empty(&le->le_list))
  81                 return;
  82
  83         gfs2_trans_add_gl(bd->bd_gl);
  84
  85         gfs2_meta_check(sdp, bd->bd_bh);
  86         gfs2_pin(sdp, bd->bd_bh);
  87
  88         gfs2_log_lock(sdp);
  89         sdp->sd_log_num_buf++;
  90         list_add(&le->le_list, &sdp->sd_log_le_buf);
  91         gfs2_log_unlock(sdp);
  92
  93         tr->tr_num_buf_new++;
  94 }
  95
  96 static void buf_lo_incore_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
  97 {
  98         struct list_head *head = &tr->tr_list_buf;
  99         struct gfs2_bufdata *bd;
 100
 101         while (!list_empty(head)) {
 102                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list_tr);
 103                 list_del_init(&bd->bd_list_tr);
 104                 tr->tr_num_buf--;
 105         }
 106         gfs2_assert_warn(sdp, !tr->tr_num_buf);
 107 }
 108
 109 static void buf_lo_before_commit(struct gfs2_sbd *sdp)
 110 {
 111         struct buffer_head *bh;
 112         struct gfs2_log_descriptor *ld;
 113         struct gfs2_bufdata *bd1 = NULL, *bd2;
 114         unsigned int total = sdp->sd_log_num_buf;
 115         unsigned int offset = sizeof(struct gfs2_log_descriptor);
 116         unsigned int limit;
 117         unsigned int num;
 118         unsigned n;
 119         __be64 *ptr;
 120
 121         offset += sizeof(__be64) - 1;
 122         offset &= ~(sizeof(__be64) - 1);
 123         limit = (sdp->sd_sb.sb_bsize - offset)/sizeof(__be64);
 124         /* for 4k blocks, limit = 503 */
 125
 126         bd1 = bd2 = list_prepare_entry(bd1, &sdp->sd_log_le_buf, bd_le.le_list);
 127         while(total) {
 128                 num = total;
 129                 if (total > limit)
 130                         num = limit;
 131                 bh = gfs2_log_get_buf(sdp);
 132                 sdp->sd_log_num_hdrs++;
 133                 ld = (struct gfs2_log_descriptor *)bh->b_data;
 134                 ptr = (__be64 *)(bh->b_data + offset);
 135                 ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 136                 ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
 137                 ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
 138                 ld->ld_type = cpu_to_be32(GFS2_LOG_DESC_METADATA);
 139                 ld->ld_length = cpu_to_be32(num + 1);
 140                 ld->ld_data1 = cpu_to_be32(num);
 141                 ld->ld_data2 = cpu_to_be32(0);
 142                 memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
 143
 144                 n = 0;
 145                 list_for_each_entry_continue(bd1, &sdp->sd_log_le_buf,
 146                                              bd_le.le_list) {
 147                         *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
 148                         if (++n >= num)
 149                                 break;
 150                 }
 151
 152                 set_buffer_dirty(bh);
 153                 ll_rw_block(WRITE, 1, &bh);
 154
 155                 n = 0;
 156                 list_for_each_entry_continue(bd2, &sdp->sd_log_le_buf,
 157                                              bd_le.le_list) {
 158                         bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
 159                         set_buffer_dirty(bh);
 160                         ll_rw_block(WRITE, 1, &bh);
 161                         if (++n >= num)
 162                                 break;
 163                 }
 164
 165                 total -= num;
 166         }
 167 }
 168
 169 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 170 {
 171         struct list_head *head = &sdp->sd_log_le_buf;
 172         struct gfs2_bufdata *bd;
 173
 174         while (!list_empty(head)) {
 175                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 176                 list_del_init(&bd->bd_le.le_list);
 177                 sdp->sd_log_num_buf--;
 178
 179                 gfs2_unpin(sdp, bd->bd_bh, ai);
 180         }
 181         gfs2_assert_warn(sdp, !sdp->sd_log_num_buf);
 182 }
 183
 184 static void buf_lo_before_scan(struct gfs2_jdesc *jd,
 185                                struct gfs2_log_header_host *head, int pass)
 186 {
 187         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 188
 189         if (pass != 0)
 190                 return;
 191
 192         sdp->sd_found_blocks = 0;
 193         sdp->sd_replayed_blocks = 0;
 194 }
 195
 196 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 197                                 struct gfs2_log_descriptor *ld, __be64 *ptr,
 198                                 int pass)
 199 {
 200         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 201         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 202         struct gfs2_glock *gl = ip->i_gl;
 203         unsigned int blks = be32_to_cpu(ld->ld_data1);
 204         struct buffer_head *bh_log, *bh_ip;
 205         u64 blkno;
 206         int error = 0;
 207
 208         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
 209                 return 0;
 210
 211         gfs2_replay_incr_blk(sdp, &start);
 212
 213         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 214                 blkno = be64_to_cpu(*ptr++);
 215
 216                 sdp->sd_found_blocks++;
 217
 218                 if (gfs2_revoke_check(sdp, blkno, start))
 219                         continue;
 220
 221                 error = gfs2_replay_read_block(jd, start, &bh_log);
 222                 if (error)
 223                         return error;
 224
 225                 bh_ip = gfs2_meta_new(gl, blkno);
 226                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 227
 228                 if (gfs2_meta_check(sdp, bh_ip))
 229                         error = -EIO;
 230                 else
 231                         mark_buffer_dirty(bh_ip);
 232
 233                 brelse(bh_log);
 234                 brelse(bh_ip);
 235
 236                 if (error)
 237                         break;
 238
 239                 sdp->sd_replayed_blocks++;
 240         }
 241
 242         return error;
 243 }
 244
 245 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 246 {
 247         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 248         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 249
 250         if (error) {
 251                 gfs2_meta_sync(ip->i_gl);
 252                 return;
 253         }
 254         if (pass != 1)
 255                 return;
 256
 257         gfs2_meta_sync(ip->i_gl);
 258
 259         fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
 260                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
 261 }
 262
 263 static void revoke_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 264 {
 265         struct gfs2_trans *tr;
 266
 267         tr = current->journal_info;
 268         tr->tr_touched = 1;
 269         tr->tr_num_revoke++;
 270
 271         gfs2_log_lock(sdp);
 272         sdp->sd_log_num_revoke++;
 273         list_add(&le->le_list, &sdp->sd_log_le_revoke);
 274         gfs2_log_unlock(sdp);
 275 }
 276
 277 static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
 278 {
 279         struct gfs2_log_descriptor *ld;
 280         struct gfs2_meta_header *mh;
 281         struct buffer_head *bh;
 282         unsigned int offset;
 283         struct list_head *head = &sdp->sd_log_le_revoke;
 284         struct gfs2_revoke *rv;
 285
 286         if (!sdp->sd_log_num_revoke)
 287                 return;
 288
 289         bh = gfs2_log_get_buf(sdp);
 290         ld = (struct gfs2_log_descriptor *)bh->b_data;
 291         ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 292         ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
 293         ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
 294         ld->ld_type = cpu_to_be32(GFS2_LOG_DESC_REVOKE);
 295         ld->ld_length = cpu_to_be32(gfs2_struct2blk(sdp, sdp->sd_log_num_revoke,
 296                                                     sizeof(u64)));
 297         ld->ld_data1 = cpu_to_be32(sdp->sd_log_num_revoke);
 298         ld->ld_data2 = cpu_to_be32(0);
 299         memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
 300         offset = sizeof(struct gfs2_log_descriptor);
 301
 302         while (!list_empty(head)) {
 303                 rv = list_entry(head->next, struct gfs2_revoke, rv_le.le_list);
 304                 list_del_init(&rv->rv_le.le_list);
 305                 sdp->sd_log_num_revoke--;
 306
 307                 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
 308                         set_buffer_dirty(bh);
 309                         ll_rw_block(WRITE, 1, &bh);
 310
 311                         bh = gfs2_log_get_buf(sdp);
 312                         mh = (struct gfs2_meta_header *)bh->b_data;
 313                         mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
 314                         mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
 315                         mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
 316                         offset = sizeof(struct gfs2_meta_header);
 317                 }
 318
 319                 *(__be64 *)(bh->b_data + offset) = cpu_to_be64(rv->rv_blkno);
 320                 kfree(rv);
 321
 322                 offset += sizeof(u64);
 323         }
 324         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
 325
 326         set_buffer_dirty(bh);
 327         ll_rw_block(WRITE, 1, &bh);
 328 }
 329
 330 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
 331                                   struct gfs2_log_header_host *head, int pass)
 332 {
 333         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 334
 335         if (pass != 0)
 336                 return;
 337
 338         sdp->sd_found_revokes = 0;
 339         sdp->sd_replay_tail = head->lh_tail;
 340 }
 341
 342 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 343                                    struct gfs2_log_descriptor *ld, __be64 *ptr,
 344                                    int pass)
 345 {
 346         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 347         unsigned int blks = be32_to_cpu(ld->ld_length);
 348         unsigned int revokes = be32_to_cpu(ld->ld_data1);
 349         struct buffer_head *bh;
 350         unsigned int offset;
 351         u64 blkno;
 352         int first = 1;
 353         int error;
 354
 355         if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
 356                 return 0;
 357
 358         offset = sizeof(struct gfs2_log_descriptor);
 359
 360         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 361                 error = gfs2_replay_read_block(jd, start, &bh);
 362                 if (error)
 363                         return error;
 364
 365                 if (!first)
 366                         gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
 367
 368                 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
 369                         blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
 370
 371                         error = gfs2_revoke_add(sdp, blkno, start);
 372                         if (error < 0)
 373                                 return error;
 374                         else if (error)
 375                                 sdp->sd_found_revokes++;
 376
 377                         if (!--revokes)
 378                                 break;
 379                         offset += sizeof(u64);
 380                 }
 381
 382                 brelse(bh);
 383                 offset = sizeof(struct gfs2_meta_header);
 384                 first = 0;
 385         }
 386
 387         return 0;
 388 }
 389
 390 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 391 {
 392         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 393
 394         if (error) {
 395                 gfs2_revoke_clean(sdp);
 396                 return;
 397         }
 398         if (pass != 1)
 399                 return;
 400
 401         fs_info(sdp, "jid=%u: Found %u revoke tags\n",
 402                 jd->jd_jid, sdp->sd_found_revokes);
 403
 404         gfs2_revoke_clean(sdp);
 405 }
 406
 407 static void rg_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 408 {
 409         struct gfs2_rgrpd *rgd;
 410         struct gfs2_trans *tr = current->journal_info;
 411
 412         tr->tr_touched = 1;
 413
 414         if (!list_empty(&le->le_list))
 415                 return;
 416
 417         rgd = container_of(le, struct gfs2_rgrpd, rd_le);
 418         gfs2_rgrp_bh_hold(rgd);
 419
 420         gfs2_log_lock(sdp);
 421         sdp->sd_log_num_rg++;
 422         list_add(&le->le_list, &sdp->sd_log_le_rg);
 423         gfs2_log_unlock(sdp);
 424 }
 425
 426 static void rg_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 427 {
 428         struct list_head *head = &sdp->sd_log_le_rg;
 429         struct gfs2_rgrpd *rgd;
 430
 431         while (!list_empty(head)) {
 432                 rgd = list_entry(head->next, struct gfs2_rgrpd, rd_le.le_list);
 433                 list_del_init(&rgd->rd_le.le_list);
 434                 sdp->sd_log_num_rg--;
 435
 436                 gfs2_rgrp_repolish_clones(rgd);
 437                 gfs2_rgrp_bh_put(rgd);
 438         }
 439         gfs2_assert_warn(sdp, !sdp->sd_log_num_rg);
 440 }
 441
 442 /**
 443  * databuf_lo_add - Add a databuf to the transaction.
 444  *
 445  * This is used in two distinct cases:
 446  * i) In ordered write mode
 447  *    We put the data buffer on a list so that we can ensure that its
 448  *    synced to disk at the right time
 449  * ii) In journaled data mode
 450  *    We need to journal the data block in the same way as metadata in
 451  *    the functions above. The difference is that here we have a tag
 452  *    which is two __be64's being the block number (as per meta data)
 453  *    and a flag which says whether the data block needs escaping or
 454  *    not. This means we need a new log entry for each 251 or so data
 455  *    blocks, which isn't an enormous overhead but twice as much as
 456  *    for normal metadata blocks.
 457  */
 458 static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 459 {
 460         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
 461         struct gfs2_trans *tr = current->journal_info;
 462         struct address_space *mapping = bd->bd_bh->b_page->mapping;
 463         struct gfs2_inode *ip = GFS2_I(mapping->host);
 464
 465         tr->tr_touched = 1;
 466         if (list_empty(&bd->bd_list_tr) &&
 467             (ip->i_di.di_flags & GFS2_DIF_JDATA)) {
 468                 tr->tr_num_buf++;
 469                 list_add(&bd->bd_list_tr, &tr->tr_list_buf);
 470                 gfs2_pin(sdp, bd->bd_bh);
 471                 tr->tr_num_buf_new++;
 472         }
 473         gfs2_trans_add_gl(bd->bd_gl);
 474         gfs2_log_lock(sdp);
 475         if (list_empty(&le->le_list)) {
 476                 if (ip->i_di.di_flags & GFS2_DIF_JDATA)
 477                         sdp->sd_log_num_jdata++;
 478                 sdp->sd_log_num_databuf++;
 479                 list_add(&le->le_list, &sdp->sd_log_le_databuf);
 480         }
 481         gfs2_log_unlock(sdp);
 482 }
 483
 484 static int gfs2_check_magic(struct buffer_head *bh)
 485 {
 486         struct page *page = bh->b_page;
 487         void *kaddr;
 488         __be32 *ptr;
 489         int rv = 0;
 490
 491         kaddr = kmap_atomic(page, KM_USER0);
 492         ptr = kaddr + bh_offset(bh);
 493         if (*ptr == cpu_to_be32(GFS2_MAGIC))
 494                 rv = 1;
 495         kunmap_atomic(kaddr, KM_USER0);
 496
 497         return rv;
 498 }
 499
 500 /**
 501  * databuf_lo_before_commit - Scan the data buffers, writing as we go
 502  *
 503  * Here we scan through the lists of buffers and make the assumption
 504  * that any buffer thats been pinned is being journaled, and that
 505  * any unpinned buffer is an ordered write data buffer and therefore
 506  * will be written back rather than journaled.
 507  */
 508 static void databuf_lo_before_commit(struct gfs2_sbd *sdp)
 509 {
 510         LIST_HEAD(started);
 511         struct gfs2_bufdata *bd1 = NULL, *bd2, *bdt;
 512         struct buffer_head *bh = NULL,*bh1 = NULL;
 513         unsigned int offset = sizeof(struct gfs2_log_descriptor);
 514         struct gfs2_log_descriptor *ld;
 515         unsigned int limit;
 516         unsigned int total_dbuf = sdp->sd_log_num_databuf;
 517         unsigned int total_jdata = sdp->sd_log_num_jdata;
 518         unsigned int num, n;
 519         __be64 *ptr = NULL;
 520
 521         offset += 2*sizeof(__be64) - 1;
 522         offset &= ~(2*sizeof(__be64) - 1);
 523         limit = (sdp->sd_sb.sb_bsize - offset)/sizeof(__be64);
 524
 525         /*
 526          * Start writing ordered buffers, write journaled buffers
 527          * into the log along with a header
 528          */
 529         gfs2_log_lock(sdp);
 530         bd2 = bd1 = list_prepare_entry(bd1, &sdp->sd_log_le_databuf,
 531                                        bd_le.le_list);
 532         while(total_dbuf) {
 533                 num = total_jdata;
 534                 if (num > limit)
 535                         num = limit;
 536                 n = 0;
 537                 list_for_each_entry_safe_continue(bd1, bdt,
 538                                                   &sdp->sd_log_le_databuf,
 539                                                   bd_le.le_list) {
 540                         /* store off the buffer head in a local ptr since
 541                          * gfs2_bufdata might change when we drop the log lock
 542                          */
 543                         bh1 = bd1->bd_bh;
 544
 545                         /* An ordered write buffer */
 546                         if (bh1 && !buffer_pinned(bh1)) {
 547                                 list_move(&bd1->bd_le.le_list, &started);
 548                                 if (bd1 == bd2) {
 549                                         bd2 = NULL;
 550                                         bd2 = list_prepare_entry(bd2,
 551                                                         &sdp->sd_log_le_databuf,
 552                                                         bd_le.le_list);
 553                                 }
 554                                 total_dbuf--;
 555                                 if (bh1) {
 556                                         if (buffer_dirty(bh1)) {
 557                                                 get_bh(bh1);
 558
 559                                                 gfs2_log_unlock(sdp);
 560
 561                                                 ll_rw_block(SWRITE, 1, &bh1);
 562                                                 brelse(bh1);
 563
 564                                                 gfs2_log_lock(sdp);
 565                                         }
 566                                         continue;
 567                                 }
 568                                 continue;
 569                         } else if (bh1) { /* A journaled buffer */
 570                                 int magic;
 571                                 gfs2_log_unlock(sdp);
 572                                 if (!bh) {
 573                                         bh = gfs2_log_get_buf(sdp);
 574                                         sdp->sd_log_num_hdrs++;
 575                                         ld = (struct gfs2_log_descriptor *)
 576                                              bh->b_data;
 577                                         ptr = (__be64 *)(bh->b_data + offset);
 578                                         ld->ld_header.mh_magic =
 579                                                 cpu_to_be32(GFS2_MAGIC);
 580                                         ld->ld_header.mh_type =
 581                                                 cpu_to_be32(GFS2_METATYPE_LD);
 582                                         ld->ld_header.mh_format =
 583                                                 cpu_to_be32(GFS2_FORMAT_LD);
 584                                         ld->ld_type =
 585                                                 cpu_to_be32(GFS2_LOG_DESC_JDATA);
 586                                         ld->ld_length = cpu_to_be32(num + 1);
 587                                         ld->ld_data1 = cpu_to_be32(num);
 588                                         ld->ld_data2 = cpu_to_be32(0);
 589                                         memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
 590                                 }
 591                                 magic = gfs2_check_magic(bh1);
 592                                 *ptr++ = cpu_to_be64(bh1->b_blocknr);
 593                                 *ptr++ = cpu_to_be64((__u64)magic);
 594                                 clear_buffer_escaped(bh1);
 595                                 if (unlikely(magic != 0))
 596                                         set_buffer_escaped(bh1);
 597                                 gfs2_log_lock(sdp);
 598                                 if (n++ > num)
 599                                         break;
 600                         } else if (!bh1) {
 601                                 total_dbuf--;
 602                                 sdp->sd_log_num_databuf--;
 603                                 list_del_init(&bd1->bd_le.le_list);
 604                                 if (bd1 == bd2) {
 605                                         bd2 = NULL;
 606                                         bd2 = list_prepare_entry(bd2,
 607                                                 &sdp->sd_log_le_databuf,
 608                                                 bd_le.le_list);
 609                                 }
 610                                 kmem_cache_free(gfs2_bufdata_cachep, bd1);
 611                         }
 612                 }
 613                 gfs2_log_unlock(sdp);
 614                 if (bh) {
 615                         set_buffer_dirty(bh);
 616                         ll_rw_block(WRITE, 1, &bh);
 617                         bh = NULL;
 618                 }
 619                 n = 0;
 620                 gfs2_log_lock(sdp);
 621                 list_for_each_entry_continue(bd2, &sdp->sd_log_le_databuf,
 622                                              bd_le.le_list) {
 623                         if (!bd2->bd_bh)
 624                                 continue;
 625                         /* copy buffer if it needs escaping */
 626                         gfs2_log_unlock(sdp);
 627                         if (unlikely(buffer_escaped(bd2->bd_bh))) {
 628                                 void *kaddr;
 629                                 struct page *page = bd2->bd_bh->b_page;
 630                                 bh = gfs2_log_get_buf(sdp);
 631                                 kaddr = kmap_atomic(page, KM_USER0);
 632                                 memcpy(bh->b_data,
 633                                        kaddr + bh_offset(bd2->bd_bh),
 634                                        sdp->sd_sb.sb_bsize);
 635                                 kunmap_atomic(kaddr, KM_USER0);
 636                                 *(__be32 *)bh->b_data = 0;
 637                         } else {
 638                                 bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
 639                         }
 640                         set_buffer_dirty(bh);
 641                         ll_rw_block(WRITE, 1, &bh);
 642                         gfs2_log_lock(sdp);
 643                         if (++n >= num)
 644                                 break;
 645                 }
 646                 bh = NULL;
 647                 total_dbuf -= num;
 648                 total_jdata -= num;
 649         }
 650         gfs2_log_unlock(sdp);
 651
 652         /* Wait on all ordered buffers */
 653         while (!list_empty(&started)) {
 654                 gfs2_log_lock(sdp);
 655                 bd1 = list_entry(started.next, struct gfs2_bufdata,
 656                                  bd_le.le_list);
 657                 list_del_init(&bd1->bd_le.le_list);
 658                 sdp->sd_log_num_databuf--;
 659                 bh = bd1->bd_bh;
 660                 if (bh) {
 661                         bh->b_private = NULL;
 662                         get_bh(bh);
 663                         gfs2_log_unlock(sdp);
 664                         wait_on_buffer(bh);
 665                         brelse(bh);
 666                 } else
 667                         gfs2_log_unlock(sdp);
 668
 669                 kmem_cache_free(gfs2_bufdata_cachep, bd1);
 670         }
 671
 672         /* We've removed all the ordered write bufs here, so only jdata left */
 673         gfs2_assert_warn(sdp, sdp->sd_log_num_databuf == sdp->sd_log_num_jdata);
 674 }
 675
 676 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 677                                     struct gfs2_log_descriptor *ld,
 678                                     __be64 *ptr, int pass)
 679 {
 680         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 681         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 682         struct gfs2_glock *gl = ip->i_gl;
 683         unsigned int blks = be32_to_cpu(ld->ld_data1);
 684         struct buffer_head *bh_log, *bh_ip;
 685         u64 blkno;
 686         u64 esc;
 687         int error = 0;
 688
 689         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
 690                 return 0;
 691
 692         gfs2_replay_incr_blk(sdp, &start);
 693         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 694                 blkno = be64_to_cpu(*ptr++);
 695                 esc = be64_to_cpu(*ptr++);
 696
 697                 sdp->sd_found_blocks++;
 698
 699                 if (gfs2_revoke_check(sdp, blkno, start))
 700                         continue;
 701
 702                 error = gfs2_replay_read_block(jd, start, &bh_log);
 703                 if (error)
 704                         return error;
 705
 706                 bh_ip = gfs2_meta_new(gl, blkno);
 707                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 708
 709                 /* Unescape */
 710                 if (esc) {
 711                         __be32 *eptr = (__be32 *)bh_ip->b_data;
 712                         *eptr = cpu_to_be32(GFS2_MAGIC);
 713                 }
 714                 mark_buffer_dirty(bh_ip);
 715
 716                 brelse(bh_log);
 717                 brelse(bh_ip);
 718                 if (error)
 719                         break;
 720
 721                 sdp->sd_replayed_blocks++;
 722         }
 723
 724         return error;
 725 }
 726
 727 /* FIXME: sort out accounting for log blocks etc. */
 728
 729 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 730 {
 731         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 732         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 733
 734         if (error) {
 735                 gfs2_meta_sync(ip->i_gl);
 736                 return;
 737         }
 738         if (pass != 1)
 739                 return;
 740
 741         /* data sync? */
 742         gfs2_meta_sync(ip->i_gl);
 743
 744         fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
 745                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
 746 }
 747
 748 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 749 {
 750         struct list_head *head = &sdp->sd_log_le_databuf;
 751         struct gfs2_bufdata *bd;
 752
 753         while (!list_empty(head)) {
 754                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 755                 list_del_init(&bd->bd_le.le_list);
 756                 sdp->sd_log_num_databuf--;
 757                 sdp->sd_log_num_jdata--;
 758                 gfs2_unpin(sdp, bd->bd_bh, ai);
 759         }
 760         gfs2_assert_warn(sdp, !sdp->sd_log_num_databuf);
 761         gfs2_assert_warn(sdp, !sdp->sd_log_num_jdata);
 762 }
 763
 764
 765 const struct gfs2_log_operations gfs2_glock_lops = {
 766         .lo_add = glock_lo_add,
 767         .lo_after_commit = glock_lo_after_commit,
 768         .lo_name = "glock",
 769 };
 770
 771 const struct gfs2_log_operations gfs2_buf_lops = {
 772         .lo_add = buf_lo_add,
 773         .lo_incore_commit = buf_lo_incore_commit,
 774         .lo_before_commit = buf_lo_before_commit,
 775         .lo_after_commit = buf_lo_after_commit,
 776         .lo_before_scan = buf_lo_before_scan,
 777         .lo_scan_elements = buf_lo_scan_elements,
 778         .lo_after_scan = buf_lo_after_scan,
 779         .lo_name = "buf",
 780 };
 781
 782 const struct gfs2_log_operations gfs2_revoke_lops = {
 783         .lo_add = revoke_lo_add,
 784         .lo_before_commit = revoke_lo_before_commit,
 785         .lo_before_scan = revoke_lo_before_scan,
 786         .lo_scan_elements = revoke_lo_scan_elements,
 787         .lo_after_scan = revoke_lo_after_scan,
 788         .lo_name = "revoke",
 789 };
 790
 791 const struct gfs2_log_operations gfs2_rg_lops = {
 792         .lo_add = rg_lo_add,
 793         .lo_after_commit = rg_lo_after_commit,
 794         .lo_name = "rg",
 795 };
 796
 797 const struct gfs2_log_operations gfs2_databuf_lops = {
 798         .lo_add = databuf_lo_add,
 799         .lo_incore_commit = buf_lo_incore_commit,
 800         .lo_before_commit = databuf_lo_before_commit,
 801         .lo_after_commit = databuf_lo_after_commit,
 802         .lo_scan_elements = databuf_lo_scan_elements,
 803         .lo_after_scan = databuf_lo_after_scan,
 804         .lo_name = "databuf",
 805 };
 806
 807 const struct gfs2_log_operations *gfs2_log_ops[] = {
 808         &gfs2_glock_lops,
 809         &gfs2_buf_lops,
 810         &gfs2_revoke_lops,
 811         &gfs2_rg_lops,
 812         &gfs2_databuf_lops,
 813         NULL,
 814 };
 815