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         gl = container_of(le, struct gfs2_glock, gl_le);
  37         if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(gl)))
  38                 return;
  39
  40         gfs2_log_lock(sdp);
  41         if (!list_empty(&le->le_list)){
  42                 gfs2_log_unlock(sdp);
  43                 return;
  44         }
  45         gfs2_glock_hold(gl);
  46         set_bit(GLF_DIRTY, &gl->gl_flags);
  47         sdp->sd_log_num_gl++;
  48         list_add(&le->le_list, &sdp->sd_log_le_gl);
  49         gfs2_log_unlock(sdp);
  50 }
  51
  52 static void glock_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
  53 {
  54         struct list_head *head = &sdp->sd_log_le_gl;
  55         struct gfs2_glock *gl;
  56
  57         while (!list_empty(head)) {
  58                 gl = list_entry(head->next, struct gfs2_glock, gl_le.le_list);
  59                 list_del_init(&gl->gl_le.le_list);
  60                 sdp->sd_log_num_gl--;
  61
  62                 gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(gl));
  63                 gfs2_glock_put(gl);
  64         }
  65         gfs2_assert_warn(sdp, !sdp->sd_log_num_gl);
  66 }
  67
  68 static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
  69 {
  70         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
  71         struct gfs2_trans *tr;
  72
  73         gfs2_log_lock(sdp);
  74         if (!list_empty(&bd->bd_list_tr)) {
  75                 gfs2_log_unlock(sdp);
  76                 return;
  77         }
  78         tr = current->journal_info;
  79         tr->tr_touched = 1;
  80         tr->tr_num_buf++;
  81         list_add(&bd->bd_list_tr, &tr->tr_list_buf);
  82         gfs2_log_unlock(sdp);
  83
  84         if (!list_empty(&le->le_list))
  85                 return;
  86
  87         gfs2_trans_add_gl(bd->bd_gl);
  88
  89         gfs2_meta_check(sdp, bd->bd_bh);
  90         gfs2_pin(sdp, bd->bd_bh);
  91         gfs2_log_lock(sdp);
  92         sdp->sd_log_num_buf++;
  93         list_add(&le->le_list, &sdp->sd_log_le_buf);
  94         gfs2_log_unlock(sdp);
  95
  96         tr->tr_num_buf_new++;
  97 }
  98
  99 static void buf_lo_incore_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 100 {
 101         struct list_head *head = &tr->tr_list_buf;
 102         struct gfs2_bufdata *bd;
 103
 104         gfs2_log_lock(sdp);
 105         while (!list_empty(head)) {
 106                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list_tr);
 107                 list_del_init(&bd->bd_list_tr);
 108                 tr->tr_num_buf--;
 109         }
 110         gfs2_log_unlock(sdp);
 111         gfs2_assert_warn(sdp, !tr->tr_num_buf);
 112 }
 113
 114 static void buf_lo_before_commit(struct gfs2_sbd *sdp)
 115 {
 116         struct buffer_head *bh;
 117         struct gfs2_log_descriptor *ld;
 118         struct gfs2_bufdata *bd1 = NULL, *bd2;
 119         unsigned int total = sdp->sd_log_num_buf;
 120         unsigned int offset = sizeof(struct gfs2_log_descriptor);
 121         unsigned int limit;
 122         unsigned int num;
 123         unsigned n;
 124         __be64 *ptr;
 125
 126         offset += sizeof(__be64) - 1;
 127         offset &= ~(sizeof(__be64) - 1);
 128         limit = (sdp->sd_sb.sb_bsize - offset)/sizeof(__be64);
 129         /* for 4k blocks, limit = 503 */
 130
 131         bd1 = bd2 = list_prepare_entry(bd1, &sdp->sd_log_le_buf, bd_le.le_list);
 132         while(total) {
 133                 num = total;
 134                 if (total > limit)
 135                         num = limit;
 136                 bh = gfs2_log_get_buf(sdp);
 137                 sdp->sd_log_num_hdrs++;
 138                 ld = (struct gfs2_log_descriptor *)bh->b_data;
 139                 ptr = (__be64 *)(bh->b_data + offset);
 140                 ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 141                 ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
 142                 ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
 143                 ld->ld_type = cpu_to_be32(GFS2_LOG_DESC_METADATA);
 144                 ld->ld_length = cpu_to_be32(num + 1);
 145                 ld->ld_data1 = cpu_to_be32(num);
 146                 ld->ld_data2 = cpu_to_be32(0);
 147                 memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
 148
 149                 n = 0;
 150                 list_for_each_entry_continue(bd1, &sdp->sd_log_le_buf,
 151                                              bd_le.le_list) {
 152                         *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
 153                         if (++n >= num)
 154                                 break;
 155                 }
 156
 157                 set_buffer_dirty(bh);
 158                 ll_rw_block(WRITE, 1, &bh);
 159
 160                 n = 0;
 161                 list_for_each_entry_continue(bd2, &sdp->sd_log_le_buf,
 162                                              bd_le.le_list) {
 163                         bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
 164                         set_buffer_dirty(bh);
 165                         ll_rw_block(WRITE, 1, &bh);
 166                         if (++n >= num)
 167                                 break;
 168                 }
 169
 170                 total -= num;
 171         }
 172 }
 173
 174 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 175 {
 176         struct list_head *head = &sdp->sd_log_le_buf;
 177         struct gfs2_bufdata *bd;
 178
 179         while (!list_empty(head)) {
 180                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 181                 list_del_init(&bd->bd_le.le_list);
 182                 sdp->sd_log_num_buf--;
 183
 184                 gfs2_unpin(sdp, bd->bd_bh, ai);
 185         }
 186         gfs2_assert_warn(sdp, !sdp->sd_log_num_buf);
 187 }
 188
 189 static void buf_lo_before_scan(struct gfs2_jdesc *jd,
 190                                struct gfs2_log_header_host *head, int pass)
 191 {
 192         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 193
 194         if (pass != 0)
 195                 return;
 196
 197         sdp->sd_found_blocks = 0;
 198         sdp->sd_replayed_blocks = 0;
 199 }
 200
 201 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 202                                 struct gfs2_log_descriptor *ld, __be64 *ptr,
 203                                 int pass)
 204 {
 205         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 206         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 207         struct gfs2_glock *gl = ip->i_gl;
 208         unsigned int blks = be32_to_cpu(ld->ld_data1);
 209         struct buffer_head *bh_log, *bh_ip;
 210         u64 blkno;
 211         int error = 0;
 212
 213         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
 214                 return 0;
 215
 216         gfs2_replay_incr_blk(sdp, &start);
 217
 218         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 219                 blkno = be64_to_cpu(*ptr++);
 220
 221                 sdp->sd_found_blocks++;
 222
 223                 if (gfs2_revoke_check(sdp, blkno, start))
 224                         continue;
 225
 226                 error = gfs2_replay_read_block(jd, start, &bh_log);
 227                 if (error)
 228                         return error;
 229
 230                 bh_ip = gfs2_meta_new(gl, blkno);
 231                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 232
 233                 if (gfs2_meta_check(sdp, bh_ip))
 234                         error = -EIO;
 235                 else
 236                         mark_buffer_dirty(bh_ip);
 237
 238                 brelse(bh_log);
 239                 brelse(bh_ip);
 240
 241                 if (error)
 242                         break;
 243
 244                 sdp->sd_replayed_blocks++;
 245         }
 246
 247         return error;
 248 }
 249
 250 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 251 {
 252         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 253         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 254
 255         if (error) {
 256                 gfs2_meta_sync(ip->i_gl);
 257                 return;
 258         }
 259         if (pass != 1)
 260                 return;
 261
 262         gfs2_meta_sync(ip->i_gl);
 263
 264         fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
 265                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
 266 }
 267
 268 static void revoke_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 269 {
 270         struct gfs2_trans *tr;
 271
 272         tr = current->journal_info;
 273         tr->tr_touched = 1;
 274         tr->tr_num_revoke++;
 275
 276         gfs2_log_lock(sdp);
 277         sdp->sd_log_num_revoke++;
 278         list_add(&le->le_list, &sdp->sd_log_le_revoke);
 279         gfs2_log_unlock(sdp);
 280 }
 281
 282 static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
 283 {
 284         struct gfs2_log_descriptor *ld;
 285         struct gfs2_meta_header *mh;
 286         struct buffer_head *bh;
 287         unsigned int offset;
 288         struct list_head *head = &sdp->sd_log_le_revoke;
 289         struct gfs2_revoke *rv;
 290
 291         if (!sdp->sd_log_num_revoke)
 292                 return;
 293
 294         bh = gfs2_log_get_buf(sdp);
 295         ld = (struct gfs2_log_descriptor *)bh->b_data;
 296         ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 297         ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
 298         ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
 299         ld->ld_type = cpu_to_be32(GFS2_LOG_DESC_REVOKE);
 300         ld->ld_length = cpu_to_be32(gfs2_struct2blk(sdp, sdp->sd_log_num_revoke,
 301                                                     sizeof(u64)));
 302         ld->ld_data1 = cpu_to_be32(sdp->sd_log_num_revoke);
 303         ld->ld_data2 = cpu_to_be32(0);
 304         memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
 305         offset = sizeof(struct gfs2_log_descriptor);
 306
 307         while (!list_empty(head)) {
 308                 rv = list_entry(head->next, struct gfs2_revoke, rv_le.le_list);
 309                 list_del_init(&rv->rv_le.le_list);
 310                 sdp->sd_log_num_revoke--;
 311
 312                 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
 313                         set_buffer_dirty(bh);
 314                         ll_rw_block(WRITE, 1, &bh);
 315
 316                         bh = gfs2_log_get_buf(sdp);
 317                         mh = (struct gfs2_meta_header *)bh->b_data;
 318                         mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
 319                         mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
 320                         mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
 321                         offset = sizeof(struct gfs2_meta_header);
 322                 }
 323
 324                 *(__be64 *)(bh->b_data + offset) = cpu_to_be64(rv->rv_blkno);
 325                 kfree(rv);
 326
 327                 offset += sizeof(u64);
 328         }
 329         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
 330
 331         set_buffer_dirty(bh);
 332         ll_rw_block(WRITE, 1, &bh);
 333 }
 334
 335 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
 336                                   struct gfs2_log_header_host *head, int pass)
 337 {
 338         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 339
 340         if (pass != 0)
 341                 return;
 342
 343         sdp->sd_found_revokes = 0;
 344         sdp->sd_replay_tail = head->lh_tail;
 345 }
 346
 347 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 348                                    struct gfs2_log_descriptor *ld, __be64 *ptr,
 349                                    int pass)
 350 {
 351         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 352         unsigned int blks = be32_to_cpu(ld->ld_length);
 353         unsigned int revokes = be32_to_cpu(ld->ld_data1);
 354         struct buffer_head *bh;
 355         unsigned int offset;
 356         u64 blkno;
 357         int first = 1;
 358         int error;
 359
 360         if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
 361                 return 0;
 362
 363         offset = sizeof(struct gfs2_log_descriptor);
 364
 365         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 366                 error = gfs2_replay_read_block(jd, start, &bh);
 367                 if (error)
 368                         return error;
 369
 370                 if (!first)
 371                         gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
 372
 373                 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
 374                         blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
 375
 376                         error = gfs2_revoke_add(sdp, blkno, start);
 377                         if (error < 0)
 378                                 return error;
 379                         else if (error)
 380                                 sdp->sd_found_revokes++;
 381
 382                         if (!--revokes)
 383                                 break;
 384                         offset += sizeof(u64);
 385                 }
 386
 387                 brelse(bh);
 388                 offset = sizeof(struct gfs2_meta_header);
 389                 first = 0;
 390         }
 391
 392         return 0;
 393 }
 394
 395 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 396 {
 397         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 398
 399         if (error) {
 400                 gfs2_revoke_clean(sdp);
 401                 return;
 402         }
 403         if (pass != 1)
 404                 return;
 405
 406         fs_info(sdp, "jid=%u: Found %u revoke tags\n",
 407                 jd->jd_jid, sdp->sd_found_revokes);
 408
 409         gfs2_revoke_clean(sdp);
 410 }
 411
 412 static void rg_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 413 {
 414         struct gfs2_rgrpd *rgd;
 415         struct gfs2_trans *tr = current->journal_info;
 416
 417         tr->tr_touched = 1;
 418
 419         rgd = container_of(le, struct gfs2_rgrpd, rd_le);
 420
 421         gfs2_log_lock(sdp);
 422         if (!list_empty(&le->le_list)){
 423                 gfs2_log_unlock(sdp);
 424                 return;
 425         }
 426         gfs2_rgrp_bh_hold(rgd);
 427         sdp->sd_log_num_rg++;
 428         list_add(&le->le_list, &sdp->sd_log_le_rg);
 429         gfs2_log_unlock(sdp);
 430 }
 431
 432 static void rg_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 433 {
 434         struct list_head *head = &sdp->sd_log_le_rg;
 435         struct gfs2_rgrpd *rgd;
 436
 437         while (!list_empty(head)) {
 438                 rgd = list_entry(head->next, struct gfs2_rgrpd, rd_le.le_list);
 439                 list_del_init(&rgd->rd_le.le_list);
 440                 sdp->sd_log_num_rg--;
 441
 442                 gfs2_rgrp_repolish_clones(rgd);
 443                 gfs2_rgrp_bh_put(rgd);
 444         }
 445         gfs2_assert_warn(sdp, !sdp->sd_log_num_rg);
 446 }
 447
 448 /**
 449  * databuf_lo_add - Add a databuf to the transaction.
 450  *
 451  * This is used in two distinct cases:
 452  * i) In ordered write mode
 453  *    We put the data buffer on a list so that we can ensure that its
 454  *    synced to disk at the right time
 455  * ii) In journaled data mode
 456  *    We need to journal the data block in the same way as metadata in
 457  *    the functions above. The difference is that here we have a tag
 458  *    which is two __be64's being the block number (as per meta data)
 459  *    and a flag which says whether the data block needs escaping or
 460  *    not. This means we need a new log entry for each 251 or so data
 461  *    blocks, which isn't an enormous overhead but twice as much as
 462  *    for normal metadata blocks.
 463  */
 464 static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 465 {
 466         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
 467         struct gfs2_trans *tr = current->journal_info;
 468         struct address_space *mapping = bd->bd_bh->b_page->mapping;
 469         struct gfs2_inode *ip = GFS2_I(mapping->host);
 470
 471         gfs2_log_lock(sdp);
 472         tr->tr_touched = 1;
 473         if (list_empty(&bd->bd_list_tr) &&
 474             (ip->i_di.di_flags & GFS2_DIF_JDATA)) {
 475                 tr->tr_num_buf++;
 476                 list_add(&bd->bd_list_tr, &tr->tr_list_buf);
 477                 gfs2_log_unlock(sdp);
 478                 gfs2_pin(sdp, bd->bd_bh);
 479                 tr->tr_num_buf_new++;
 480         } else {
 481                 gfs2_log_unlock(sdp);
 482         }
 483         gfs2_trans_add_gl(bd->bd_gl);
 484         gfs2_log_lock(sdp);
 485         if (list_empty(&le->le_list)) {
 486                 if (ip->i_di.di_flags & GFS2_DIF_JDATA)
 487                         sdp->sd_log_num_jdata++;
 488                 sdp->sd_log_num_databuf++;
 489                 list_add(&le->le_list, &sdp->sd_log_le_databuf);
 490         }
 491         gfs2_log_unlock(sdp);
 492 }
 493
 494 static int gfs2_check_magic(struct buffer_head *bh)
 495 {
 496         struct page *page = bh->b_page;
 497         void *kaddr;
 498         __be32 *ptr;
 499         int rv = 0;
 500
 501         kaddr = kmap_atomic(page, KM_USER0);
 502         ptr = kaddr + bh_offset(bh);
 503         if (*ptr == cpu_to_be32(GFS2_MAGIC))
 504                 rv = 1;
 505         kunmap_atomic(kaddr, KM_USER0);
 506
 507         return rv;
 508 }
 509
 510 /**
 511  * databuf_lo_before_commit - Scan the data buffers, writing as we go
 512  *
 513  * Here we scan through the lists of buffers and make the assumption
 514  * that any buffer thats been pinned is being journaled, and that
 515  * any unpinned buffer is an ordered write data buffer and therefore
 516  * will be written back rather than journaled.
 517  */
 518 static void databuf_lo_before_commit(struct gfs2_sbd *sdp)
 519 {
 520         LIST_HEAD(started);
 521         struct gfs2_bufdata *bd1 = NULL, *bd2, *bdt;
 522         struct buffer_head *bh = NULL,*bh1 = NULL;
 523         unsigned int offset = sizeof(struct gfs2_log_descriptor);
 524         struct gfs2_log_descriptor *ld;
 525         unsigned int limit;
 526         unsigned int total_dbuf = sdp->sd_log_num_databuf;
 527         unsigned int total_jdata = sdp->sd_log_num_jdata;
 528         unsigned int num, n;
 529         __be64 *ptr = NULL;
 530
 531         offset += 2*sizeof(__be64) - 1;
 532         offset &= ~(2*sizeof(__be64) - 1);
 533         limit = (sdp->sd_sb.sb_bsize - offset)/sizeof(__be64);
 534
 535         /*
 536          * Start writing ordered buffers, write journaled buffers
 537          * into the log along with a header
 538          */
 539         gfs2_log_lock(sdp);
 540         bd2 = bd1 = list_prepare_entry(bd1, &sdp->sd_log_le_databuf,
 541                                        bd_le.le_list);
 542         while(total_dbuf) {
 543                 num = total_jdata;
 544                 if (num > limit)
 545                         num = limit;
 546                 n = 0;
 547                 list_for_each_entry_safe_continue(bd1, bdt,
 548                                                   &sdp->sd_log_le_databuf,
 549                                                   bd_le.le_list) {
 550                         /* store off the buffer head in a local ptr since
 551                          * gfs2_bufdata might change when we drop the log lock
 552                          */
 553                         bh1 = bd1->bd_bh;
 554
 555                         /* An ordered write buffer */
 556                         if (bh1 && !buffer_pinned(bh1)) {
 557                                 list_move(&bd1->bd_le.le_list, &started);
 558                                 if (bd1 == bd2) {
 559                                         bd2 = NULL;
 560                                         bd2 = list_prepare_entry(bd2,
 561                                                         &sdp->sd_log_le_databuf,
 562                                                         bd_le.le_list);
 563                                 }
 564                                 total_dbuf--;
 565                                 if (bh1) {
 566                                         if (buffer_dirty(bh1)) {
 567                                                 get_bh(bh1);
 568
 569                                                 gfs2_log_unlock(sdp);
 570
 571                                                 ll_rw_block(SWRITE, 1, &bh1);
 572                                                 brelse(bh1);
 573
 574                                                 gfs2_log_lock(sdp);
 575                                         }
 576                                         continue;
 577                                 }
 578                                 continue;
 579                         } else if (bh1) { /* A journaled buffer */
 580                                 int magic;
 581                                 gfs2_log_unlock(sdp);
 582                                 if (!bh) {
 583                                         bh = gfs2_log_get_buf(sdp);
 584                                         sdp->sd_log_num_hdrs++;
 585                                         ld = (struct gfs2_log_descriptor *)
 586                                              bh->b_data;
 587                                         ptr = (__be64 *)(bh->b_data + offset);
 588                                         ld->ld_header.mh_magic =
 589                                                 cpu_to_be32(GFS2_MAGIC);
 590                                         ld->ld_header.mh_type =
 591                                                 cpu_to_be32(GFS2_METATYPE_LD);
 592                                         ld->ld_header.mh_format =
 593                                                 cpu_to_be32(GFS2_FORMAT_LD);
 594                                         ld->ld_type =
 595                                                 cpu_to_be32(GFS2_LOG_DESC_JDATA);
 596                                         ld->ld_length = cpu_to_be32(num + 1);
 597                                         ld->ld_data1 = cpu_to_be32(num);
 598                                         ld->ld_data2 = cpu_to_be32(0);
 599                                         memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
 600                                 }
 601                                 magic = gfs2_check_magic(bh1);
 602                                 *ptr++ = cpu_to_be64(bh1->b_blocknr);
 603                                 *ptr++ = cpu_to_be64((__u64)magic);
 604                                 clear_buffer_escaped(bh1);
 605                                 if (unlikely(magic != 0))
 606                                         set_buffer_escaped(bh1);
 607                                 gfs2_log_lock(sdp);
 608                                 if (n++ > num)
 609                                         break;
 610                         } else if (!bh1) {
 611                                 total_dbuf--;
 612                                 sdp->sd_log_num_databuf--;
 613                                 list_del_init(&bd1->bd_le.le_list);
 614                                 if (bd1 == bd2) {
 615                                         bd2 = NULL;
 616                                         bd2 = list_prepare_entry(bd2,
 617                                                 &sdp->sd_log_le_databuf,
 618                                                 bd_le.le_list);
 619                                 }
 620                                 kmem_cache_free(gfs2_bufdata_cachep, bd1);
 621                         }
 622                 }
 623                 gfs2_log_unlock(sdp);
 624                 if (bh) {
 625                         set_buffer_dirty(bh);
 626                         ll_rw_block(WRITE, 1, &bh);
 627                         bh = NULL;
 628                 }
 629                 n = 0;
 630                 gfs2_log_lock(sdp);
 631                 list_for_each_entry_continue(bd2, &sdp->sd_log_le_databuf,
 632                                              bd_le.le_list) {
 633                         if (!bd2->bd_bh)
 634                                 continue;
 635                         /* copy buffer if it needs escaping */
 636                         gfs2_log_unlock(sdp);
 637                         if (unlikely(buffer_escaped(bd2->bd_bh))) {
 638                                 void *kaddr;
 639                                 struct page *page = bd2->bd_bh->b_page;
 640                                 bh = gfs2_log_get_buf(sdp);
 641                                 kaddr = kmap_atomic(page, KM_USER0);
 642                                 memcpy(bh->b_data,
 643                                        kaddr + bh_offset(bd2->bd_bh),
 644                                        sdp->sd_sb.sb_bsize);
 645                                 kunmap_atomic(kaddr, KM_USER0);
 646                                 *(__be32 *)bh->b_data = 0;
 647                         } else {
 648                                 bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
 649                         }
 650                         set_buffer_dirty(bh);
 651                         ll_rw_block(WRITE, 1, &bh);
 652                         gfs2_log_lock(sdp);
 653                         if (++n >= num)
 654                                 break;
 655                 }
 656                 bh = NULL;
 657                 total_dbuf -= num;
 658                 total_jdata -= num;
 659         }
 660         gfs2_log_unlock(sdp);
 661
 662         /* Wait on all ordered buffers */
 663         while (!list_empty(&started)) {
 664                 gfs2_log_lock(sdp);
 665                 bd1 = list_entry(started.next, struct gfs2_bufdata,
 666                                  bd_le.le_list);
 667                 list_del_init(&bd1->bd_le.le_list);
 668                 sdp->sd_log_num_databuf--;
 669                 bh = bd1->bd_bh;
 670                 if (bh) {
 671                         bh->b_private = NULL;
 672                         get_bh(bh);
 673                         gfs2_log_unlock(sdp);
 674                         wait_on_buffer(bh);
 675                         brelse(bh);
 676                 } else
 677                         gfs2_log_unlock(sdp);
 678
 679                 kmem_cache_free(gfs2_bufdata_cachep, bd1);
 680         }
 681
 682         /* We've removed all the ordered write bufs here, so only jdata left */
 683         gfs2_assert_warn(sdp, sdp->sd_log_num_databuf == sdp->sd_log_num_jdata);
 684 }
 685
 686 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 687                                     struct gfs2_log_descriptor *ld,
 688                                     __be64 *ptr, int pass)
 689 {
 690         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 691         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 692         struct gfs2_glock *gl = ip->i_gl;
 693         unsigned int blks = be32_to_cpu(ld->ld_data1);
 694         struct buffer_head *bh_log, *bh_ip;
 695         u64 blkno;
 696         u64 esc;
 697         int error = 0;
 698
 699         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
 700                 return 0;
 701
 702         gfs2_replay_incr_blk(sdp, &start);
 703         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 704                 blkno = be64_to_cpu(*ptr++);
 705                 esc = be64_to_cpu(*ptr++);
 706
 707                 sdp->sd_found_blocks++;
 708
 709                 if (gfs2_revoke_check(sdp, blkno, start))
 710                         continue;
 711
 712                 error = gfs2_replay_read_block(jd, start, &bh_log);
 713                 if (error)
 714                         return error;
 715
 716                 bh_ip = gfs2_meta_new(gl, blkno);
 717                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 718
 719                 /* Unescape */
 720                 if (esc) {
 721                         __be32 *eptr = (__be32 *)bh_ip->b_data;
 722                         *eptr = cpu_to_be32(GFS2_MAGIC);
 723                 }
 724                 mark_buffer_dirty(bh_ip);
 725
 726                 brelse(bh_log);
 727                 brelse(bh_ip);
 728                 if (error)
 729                         break;
 730
 731                 sdp->sd_replayed_blocks++;
 732         }
 733
 734         return error;
 735 }
 736
 737 /* FIXME: sort out accounting for log blocks etc. */
 738
 739 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 740 {
 741         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 742         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 743
 744         if (error) {
 745                 gfs2_meta_sync(ip->i_gl);
 746                 return;
 747         }
 748         if (pass != 1)
 749                 return;
 750
 751         /* data sync? */
 752         gfs2_meta_sync(ip->i_gl);
 753
 754         fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
 755                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
 756 }
 757
 758 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 759 {
 760         struct list_head *head = &sdp->sd_log_le_databuf;
 761         struct gfs2_bufdata *bd;
 762
 763         while (!list_empty(head)) {
 764                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 765                 list_del_init(&bd->bd_le.le_list);
 766                 sdp->sd_log_num_databuf--;
 767                 sdp->sd_log_num_jdata--;
 768                 gfs2_unpin(sdp, bd->bd_bh, ai);
 769         }
 770         gfs2_assert_warn(sdp, !sdp->sd_log_num_databuf);
 771         gfs2_assert_warn(sdp, !sdp->sd_log_num_jdata);
 772 }
 773
 774
 775 const struct gfs2_log_operations gfs2_glock_lops = {
 776         .lo_add = glock_lo_add,
 777         .lo_after_commit = glock_lo_after_commit,
 778         .lo_name = "glock",
 779 };
 780
 781 const struct gfs2_log_operations gfs2_buf_lops = {
 782         .lo_add = buf_lo_add,
 783         .lo_incore_commit = buf_lo_incore_commit,
 784         .lo_before_commit = buf_lo_before_commit,
 785         .lo_after_commit = buf_lo_after_commit,
 786         .lo_before_scan = buf_lo_before_scan,
 787         .lo_scan_elements = buf_lo_scan_elements,
 788         .lo_after_scan = buf_lo_after_scan,
 789         .lo_name = "buf",
 790 };
 791
 792 const struct gfs2_log_operations gfs2_revoke_lops = {
 793         .lo_add = revoke_lo_add,
 794         .lo_before_commit = revoke_lo_before_commit,
 795         .lo_before_scan = revoke_lo_before_scan,
 796         .lo_scan_elements = revoke_lo_scan_elements,
 797         .lo_after_scan = revoke_lo_after_scan,
 798         .lo_name = "revoke",
 799 };
 800
 801 const struct gfs2_log_operations gfs2_rg_lops = {
 802         .lo_add = rg_lo_add,
 803         .lo_after_commit = rg_lo_after_commit,
 804         .lo_name = "rg",
 805 };
 806
 807 const struct gfs2_log_operations gfs2_databuf_lops = {
 808         .lo_add = databuf_lo_add,
 809         .lo_incore_commit = buf_lo_incore_commit,
 810         .lo_before_commit = databuf_lo_before_commit,
 811         .lo_after_commit = databuf_lo_after_commit,
 812         .lo_scan_elements = databuf_lo_scan_elements,
 813         .lo_after_scan = databuf_lo_after_scan,
 814         .lo_name = "databuf",
 815 };
 816
 817 const struct gfs2_log_operations *gfs2_log_ops[] = {
 818         &gfs2_glock_lops,
 819         &gfs2_buf_lops,
 820         &gfs2_revoke_lops,
 821         &gfs2_rg_lops,
 822         &gfs2_databuf_lops,
 823         NULL,
 824 };
 825