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) 2004-2005 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 v.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 <asm/semaphore.h>
  17
  18 #include "gfs2.h"
  19 #include "lm_interface.h"
  20 #include "incore.h"
  21 #include "glock.h"
  22 #include "log.h"
  23 #include "lops.h"
  24 #include "meta_io.h"
  25 #include "recovery.h"
  26 #include "rgrp.h"
  27 #include "trans.h"
  28 #include "util.h"
  29
  30 static void glock_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
  31 {
  32         struct gfs2_glock *gl;
  33         struct gfs2_trans *tr = current->journal_info;
  34
  35         tr->tr_touched = 1;
  36
  37         if (!list_empty(&le->le_list))
  38                 return;
  39
  40         gl = container_of(le, struct gfs2_glock, gl_le);
  41         if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(gl)))
  42                 return;
  43         gfs2_glock_hold(gl);
  44         set_bit(GLF_DIRTY, &gl->gl_flags);
  45
  46         gfs2_log_lock(sdp);
  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         if (!list_empty(&bd->bd_list_tr))
  74                 return;
  75
  76         tr = current->journal_info;
  77         tr->tr_touched = 1;
  78         tr->tr_num_buf++;
  79         list_add(&bd->bd_list_tr, &tr->tr_list_buf);
  80
  81         if (!list_empty(&le->le_list))
  82                 return;
  83
  84         gfs2_trans_add_gl(bd->bd_gl);
  85
  86         gfs2_meta_check(sdp, bd->bd_bh);
  87         gfs2_pin(sdp, bd->bd_bh);
  88
  89         gfs2_log_lock(sdp);
  90         sdp->sd_log_num_buf++;
  91         list_add(&le->le_list, &sdp->sd_log_le_buf);
  92         gfs2_log_unlock(sdp);
  93
  94         tr->tr_num_buf_new++;
  95 }
  96
  97 static void buf_lo_incore_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
  98 {
  99         struct list_head *head = &tr->tr_list_buf;
 100         struct gfs2_bufdata *bd;
 101
 102         while (!list_empty(head)) {
 103                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list_tr);
 104                 list_del_init(&bd->bd_list_tr);
 105                 tr->tr_num_buf--;
 106         }
 107         gfs2_assert_warn(sdp, !tr->tr_num_buf);
 108 }
 109
 110 static void buf_lo_before_commit(struct gfs2_sbd *sdp)
 111 {
 112         struct buffer_head *bh;
 113         struct gfs2_log_descriptor *ld;
 114         struct gfs2_bufdata *bd1 = NULL, *bd2;
 115         unsigned int total = sdp->sd_log_num_buf;
 116         unsigned int offset = sizeof(struct gfs2_log_descriptor);
 117         unsigned int limit;
 118         unsigned int num;
 119         unsigned n;
 120         __be64 *ptr;
 121
 122         offset += (sizeof(__be64) - 1);
 123         offset &= ~(sizeof(__be64) - 1);
 124         limit = (sdp->sd_sb.sb_bsize - offset)/sizeof(__be64);
 125         /* for 4k blocks, limit = 503 */
 126
 127         bd1 = bd2 = list_prepare_entry(bd1, &sdp->sd_log_le_buf, bd_le.le_list);
 128         while(total) {
 129                 num = total;
 130                 if (total > limit)
 131                         num = limit;
 132                 bh = gfs2_log_get_buf(sdp);
 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_be16(GFS2_METATYPE_LD);
 137                 ld->ld_header.mh_format = cpu_to_be16(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 *head, int pass)
 186 {
 187         struct gfs2_inode *ip = jd->jd_inode->u.generic_ip;
 188         struct gfs2_sbd *sdp = ip->i_sbd;
 189
 190         if (pass != 0)
 191                 return;
 192
 193         sdp->sd_found_blocks = 0;
 194         sdp->sd_replayed_blocks = 0;
 195 }
 196
 197 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 198                                 struct gfs2_log_descriptor *ld, __be64 *ptr,
 199                                 int pass)
 200 {
 201         struct gfs2_inode *ip = jd->jd_inode->u.generic_ip;
 202         struct gfs2_sbd *sdp = ip->i_sbd;
 203         struct gfs2_glock *gl = ip->i_gl;
 204         unsigned int blks = be32_to_cpu(ld->ld_data1);
 205         struct buffer_head *bh_log, *bh_ip;
 206         uint64_t blkno;
 207         int error = 0;
 208
 209         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
 210                 return 0;
 211
 212         gfs2_replay_incr_blk(sdp, &start);
 213
 214         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 215                 blkno = be64_to_cpu(*ptr++);
 216
 217                 sdp->sd_found_blocks++;
 218
 219                 if (gfs2_revoke_check(sdp, blkno, start))
 220                         continue;
 221
 222                 error = gfs2_replay_read_block(jd, start, &bh_log);
 223                 if (error)
 224                         return error;
 225
 226                 bh_ip = gfs2_meta_new(gl, blkno);
 227                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 228
 229                 if (gfs2_meta_check(sdp, bh_ip))
 230                         error = -EIO;
 231                 else
 232                         mark_buffer_dirty(bh_ip);
 233
 234                 brelse(bh_log);
 235                 brelse(bh_ip);
 236
 237                 if (error)
 238                         break;
 239
 240                 sdp->sd_replayed_blocks++;
 241         }
 242
 243         return error;
 244 }
 245
 246 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 247 {
 248         struct gfs2_inode *ip = jd->jd_inode->u.generic_ip;
 249         struct gfs2_sbd *sdp = ip->i_sbd;
 250
 251         if (error) {
 252                 gfs2_meta_sync(ip->i_gl,
 253                                DIO_START | DIO_WAIT);
 254                 return;
 255         }
 256         if (pass != 1)
 257                 return;
 258
 259         gfs2_meta_sync(ip->i_gl, DIO_START | DIO_WAIT);
 260
 261         fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
 262                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
 263 }
 264
 265 static void revoke_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 266 {
 267         struct gfs2_trans *tr;
 268
 269         tr = current->journal_info;
 270         tr->tr_touched = 1;
 271         tr->tr_num_revoke++;
 272
 273         gfs2_log_lock(sdp);
 274         sdp->sd_log_num_revoke++;
 275         list_add(&le->le_list, &sdp->sd_log_le_revoke);
 276         gfs2_log_unlock(sdp);
 277 }
 278
 279 static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
 280 {
 281         struct gfs2_log_descriptor *ld;
 282         struct gfs2_meta_header *mh;
 283         struct buffer_head *bh;
 284         unsigned int offset;
 285         struct list_head *head = &sdp->sd_log_le_revoke;
 286         struct gfs2_revoke *rv;
 287
 288         if (!sdp->sd_log_num_revoke)
 289                 return;
 290
 291         bh = gfs2_log_get_buf(sdp);
 292         ld = (struct gfs2_log_descriptor *)bh->b_data;
 293         ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 294         ld->ld_header.mh_type = cpu_to_be16(GFS2_METATYPE_LD);
 295         ld->ld_header.mh_format = cpu_to_be16(GFS2_FORMAT_LD);
 296         ld->ld_type = cpu_to_be32(GFS2_LOG_DESC_REVOKE);
 297         ld->ld_length = cpu_to_be32(gfs2_struct2blk(sdp, sdp->sd_log_num_revoke,
 298                                                     sizeof(uint64_t)));
 299         ld->ld_data1 = cpu_to_be32(sdp->sd_log_num_revoke);
 300         ld->ld_data2 = cpu_to_be32(0);
 301         memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
 302         offset = sizeof(struct gfs2_log_descriptor);
 303
 304         while (!list_empty(head)) {
 305                 rv = list_entry(head->next, struct gfs2_revoke, rv_le.le_list);
 306                 list_del_init(&rv->rv_le.le_list);
 307                 sdp->sd_log_num_revoke--;
 308
 309                 if (offset + sizeof(uint64_t) > sdp->sd_sb.sb_bsize) {
 310                         set_buffer_dirty(bh);
 311                         ll_rw_block(WRITE, 1, &bh);
 312
 313                         bh = gfs2_log_get_buf(sdp);
 314                         mh = (struct gfs2_meta_header *)bh->b_data;
 315                         mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
 316                         mh->mh_type = cpu_to_be16(GFS2_METATYPE_LB);
 317                         mh->mh_format = cpu_to_be16(GFS2_FORMAT_LB);
 318                         offset = sizeof(struct gfs2_meta_header);
 319                 }
 320
 321                 *(__be64 *)(bh->b_data + offset) = cpu_to_be64(rv->rv_blkno);
 322                 kfree(rv);
 323
 324                 offset += sizeof(uint64_t);
 325         }
 326         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
 327
 328         set_buffer_dirty(bh);
 329         ll_rw_block(WRITE, 1, &bh);
 330 }
 331
 332 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
 333                                   struct gfs2_log_header *head, int pass)
 334 {
 335         struct gfs2_inode *ip = jd->jd_inode->u.generic_ip;
 336         struct gfs2_sbd *sdp = ip->i_sbd;
 337
 338         if (pass != 0)
 339                 return;
 340
 341         sdp->sd_found_revokes = 0;
 342         sdp->sd_replay_tail = head->lh_tail;
 343 }
 344
 345 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 346                                    struct gfs2_log_descriptor *ld, __be64 *ptr,
 347                                    int pass)
 348 {
 349         struct gfs2_inode *ip = jd->jd_inode->u.generic_ip;
 350         struct gfs2_sbd *sdp = ip->i_sbd;
 351         unsigned int blks = be32_to_cpu(ld->ld_length);
 352         unsigned int revokes = be32_to_cpu(ld->ld_data1);
 353         struct buffer_head *bh;
 354         unsigned int offset;
 355         uint64_t blkno;
 356         int first = 1;
 357         int error;
 358
 359         if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
 360                 return 0;
 361
 362         offset = sizeof(struct gfs2_log_descriptor);
 363
 364         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 365                 error = gfs2_replay_read_block(jd, start, &bh);
 366                 if (error)
 367                         return error;
 368
 369                 if (!first)
 370                         gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
 371
 372                 while (offset + sizeof(uint64_t) <= sdp->sd_sb.sb_bsize) {
 373                         blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
 374
 375                         error = gfs2_revoke_add(sdp, blkno, start);
 376                         if (error < 0)
 377                                 return error;
 378                         else if (error)
 379                                 sdp->sd_found_revokes++;
 380
 381                         if (!--revokes)
 382                                 break;
 383                         offset += sizeof(uint64_t);
 384                 }
 385
 386                 brelse(bh);
 387                 offset = sizeof(struct gfs2_meta_header);
 388                 first = 0;
 389         }
 390
 391         return 0;
 392 }
 393
 394 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 395 {
 396         struct gfs2_inode *ip = jd->jd_inode->u.generic_ip;
 397         struct gfs2_sbd *sdp = ip->i_sbd;
 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         if (!list_empty(&le->le_list))
 420                 return;
 421
 422         rgd = container_of(le, struct gfs2_rgrpd, rd_le);
 423         gfs2_rgrp_bh_hold(rgd);
 424
 425         gfs2_log_lock(sdp);
 426         sdp->sd_log_num_rg++;
 427         list_add(&le->le_list, &sdp->sd_log_le_rg);
 428         gfs2_log_unlock(sdp);
 429 }
 430
 431 static void rg_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 432 {
 433         struct list_head *head = &sdp->sd_log_le_rg;
 434         struct gfs2_rgrpd *rgd;
 435
 436         while (!list_empty(head)) {
 437                 rgd = list_entry(head->next, struct gfs2_rgrpd, rd_le.le_list);
 438                 list_del_init(&rgd->rd_le.le_list);
 439                 sdp->sd_log_num_rg--;
 440
 441                 gfs2_rgrp_repolish_clones(rgd);
 442                 gfs2_rgrp_bh_put(rgd);
 443         }
 444         gfs2_assert_warn(sdp, !sdp->sd_log_num_rg);
 445 }
 446
 447 /**
 448  * databuf_lo_add - Add a databuf to the transaction.
 449  *
 450  * This is used in two distinct cases:
 451  * i) In ordered write mode
 452  *    We put the data buffer on a list so that we can ensure that its
 453  *    synced to disk at the right time
 454  * ii) In journaled data mode
 455  *    We need to journal the data block in the same way as metadata in
 456  *    the functions above. The difference is that here we have a tag
 457  *    which is two __be64's being the block number (as per meta data)
 458  *    and a flag which says whether the data block needs escaping or
 459  *    not. This means we need a new log entry for each 251 or so data
 460  *    blocks, which isn't an enormous overhead but twice as much as
 461  *    for normal metadata blocks.
 462  */
 463 static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 464 {
 465         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
 466         struct gfs2_trans *tr = current->journal_info;
 467         struct address_space *mapping = bd->bd_bh->b_page->mapping;
 468         struct gfs2_inode *ip = mapping->host->u.generic_ip;
 469
 470         tr->tr_touched = 1;
 471         if (!list_empty(&bd->bd_list_tr) &&
 472             (ip->i_di.di_flags & GFS2_DIF_JDATA)) {
 473                 tr->tr_num_buf++;
 474                 gfs2_trans_add_gl(bd->bd_gl);
 475                 list_add(&bd->bd_list_tr, &tr->tr_list_buf);
 476                 gfs2_pin(sdp, bd->bd_bh);
 477         }
 478         gfs2_log_lock(sdp);
 479         if (!list_empty(&le->le_list)) {
 480                 if (ip->i_di.di_flags & GFS2_DIF_JDATA)
 481                         sdp->sd_log_num_jdata++;
 482                 sdp->sd_log_num_databuf++;
 483                 list_add(&le->le_list, &sdp->sd_log_le_databuf);
 484         }
 485         gfs2_log_unlock(sdp);
 486 }
 487
 488 static int gfs2_check_magic(struct buffer_head *bh)
 489 {
 490         struct page *page = bh->b_page;
 491         void *kaddr;
 492         __be32 *ptr;
 493         int rv = 0;
 494
 495         kaddr = kmap_atomic(page, KM_USER0);
 496         ptr = kaddr + bh_offset(bh);
 497         if (*ptr == cpu_to_be32(GFS2_MAGIC))
 498                 rv = 1;
 499         kunmap_atomic(page, KM_USER0);
 500
 501         return rv;
 502 }
 503
 504 /**
 505  * databuf_lo_before_commit - Scan the data buffers, writing as we go
 506  *
 507  * Here we scan through the lists of buffers and make the assumption
 508  * that any buffer thats been pinned is being journaled, and that
 509  * any unpinned buffer is an ordered write data buffer and therefore
 510  * will be written back rather than journaled.
 511  */
 512 static void databuf_lo_before_commit(struct gfs2_sbd *sdp)
 513 {
 514         LIST_HEAD(started);
 515         struct gfs2_bufdata *bd1 = NULL, *bd2, *bdt;
 516         struct buffer_head *bh = NULL;
 517         unsigned int offset = sizeof(struct gfs2_log_descriptor);
 518         struct gfs2_log_descriptor *ld;
 519         unsigned int limit;
 520         unsigned int total_dbuf = sdp->sd_log_num_databuf;
 521         unsigned int total_jdata = sdp->sd_log_num_jdata;
 522         unsigned int num, n;
 523         __be64 *ptr = NULL;
 524
 525         offset += (2*sizeof(__be64) - 1);
 526         offset &= ~(2*sizeof(__be64) - 1);
 527         limit = (sdp->sd_sb.sb_bsize - offset)/sizeof(__be64);
 528
 529         /*
 530          * Start writing ordered buffers, write journaled buffers
 531          * into the log along with a header
 532          */
 533         gfs2_log_lock(sdp);
 534         bd2 = bd1 = list_prepare_entry(bd1, &sdp->sd_log_le_databuf,
 535                                        bd_le.le_list);
 536         while(total_dbuf) {
 537                 num = total_jdata;
 538                 if (num > limit)
 539                         num = limit;
 540                 n = 0;
 541                 list_for_each_entry_safe_continue(bd1, bdt,
 542                                                   &sdp->sd_log_le_databuf,
 543                                                   bd_le.le_list) {
 544                         /* An ordered write buffer */
 545                         if (bd1->bd_bh && !buffer_pinned(bd1->bd_bh)) {
 546                                 list_move(&bd1->bd_le.le_list, &started);
 547                                 if (bd1 == bd2) {
 548                                         bd2 = NULL;
 549                                         bd2 = list_prepare_entry(bd2,
 550                                                         &sdp->sd_log_le_databuf,
 551                                                         bd_le.le_list);
 552                                 }
 553                                 total_dbuf--;
 554                                 if (bd1->bd_bh) {
 555                                         get_bh(bd1->bd_bh);
 556                                         if (buffer_dirty(bd1->bd_bh)) {
 557                                                 gfs2_log_unlock(sdp);
 558                                                 wait_on_buffer(bd1->bd_bh);
 559                                                 ll_rw_block(WRITE, 1,
 560                                                             &bd1->bd_bh);
 561                                                 gfs2_log_lock(sdp);
 562                                         }
 563                                         brelse(bd1->bd_bh);
 564                                         continue;
 565                                 }
 566                                 continue;
 567                         } else if (bd1->bd_bh) { /* A journaled buffer */
 568                                 int magic;
 569                                 gfs2_log_unlock(sdp);
 570                                 if (!bh) {
 571                                         bh = gfs2_log_get_buf(sdp);
 572                                         ld = (struct gfs2_log_descriptor *)
 573                                              bh->b_data;
 574                                         ptr = (__be64 *)(bh->b_data + offset);
 575                                         ld->ld_header.mh_magic =
 576                                                 cpu_to_be32(GFS2_MAGIC);
 577                                         ld->ld_header.mh_type =
 578                                                 cpu_to_be16(GFS2_METATYPE_LD);
 579                                         ld->ld_header.mh_format =
 580                                                 cpu_to_be16(GFS2_FORMAT_LD);
 581                                         ld->ld_type =
 582                                                 cpu_to_be32(GFS2_LOG_DESC_JDATA);
 583                                         ld->ld_length = cpu_to_be32(num + 1);
 584                                         ld->ld_data1 = cpu_to_be32(num);
 585                                         ld->ld_data2 = cpu_to_be32(0);
 586                                         memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
 587                                 }
 588                                 magic = gfs2_check_magic(bd1->bd_bh);
 589                                 *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
 590                                 *ptr++ = cpu_to_be64((__u64)magic);
 591                                 clear_buffer_escaped(bd1->bd_bh);
 592                                 if (unlikely(magic != 0))
 593                                         set_buffer_escaped(bd1->bd_bh);
 594                                 gfs2_log_lock(sdp);
 595                                 if (n++ > num)
 596                                         break;
 597                         }
 598                 }
 599                 gfs2_log_unlock(sdp);
 600                 if (bh) {
 601                         set_buffer_dirty(bh);
 602                         ll_rw_block(WRITE, 1, &bh);
 603                         bh = NULL;
 604                 }
 605                 n = 0;
 606                 gfs2_log_lock(sdp);
 607                 list_for_each_entry_continue(bd2, &sdp->sd_log_le_databuf,
 608                                              bd_le.le_list) {
 609                         if (!bd2->bd_bh)
 610                                 continue;
 611                         /* copy buffer if it needs escaping */
 612                         gfs2_log_unlock(sdp);
 613                         if (unlikely(buffer_escaped(bd2->bd_bh))) {
 614                                 void *kaddr;
 615                                 struct page *page = bd2->bd_bh->b_page;
 616                                 bh = gfs2_log_get_buf(sdp);
 617                                 kaddr = kmap_atomic(page, KM_USER0);
 618                                 memcpy(bh->b_data,
 619                                        kaddr + bh_offset(bd2->bd_bh),
 620                                        sdp->sd_sb.sb_bsize);
 621                                 kunmap_atomic(page, KM_USER0);
 622                                 *(__be32 *)bh->b_data = 0;
 623                         } else {
 624                                 bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
 625                         }
 626                         set_buffer_dirty(bh);
 627                         ll_rw_block(WRITE, 1, &bh);
 628                         gfs2_log_lock(sdp);
 629                         if (++n >= num)
 630                                 break;
 631                 }
 632                 bh = NULL;
 633                 total_dbuf -= num;
 634                 total_jdata -= num;
 635         }
 636         gfs2_log_unlock(sdp);
 637
 638         /* Wait on all ordered buffers */
 639         while (!list_empty(&started)) {
 640                 gfs2_log_lock(sdp);
 641                 bd1 = list_entry(started.next, struct gfs2_bufdata,
 642                                  bd_le.le_list);
 643                 list_del(&bd1->bd_le.le_list);
 644                 sdp->sd_log_num_databuf--;
 645
 646                 bh = bd1->bd_bh;
 647                 if (bh) {
 648                         bh->b_private = NULL;
 649                         gfs2_log_unlock(sdp);
 650                         wait_on_buffer(bh);
 651                         brelse(bh);
 652                 } else
 653                         gfs2_log_unlock(sdp);
 654
 655                 kfree(bd1);
 656         }
 657
 658         /* We've removed all the ordered write bufs here, so only jdata left */
 659         gfs2_assert_warn(sdp, sdp->sd_log_num_databuf == sdp->sd_log_num_jdata);
 660 }
 661
 662 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 663                                     struct gfs2_log_descriptor *ld,
 664                                     __be64 *ptr, int pass)
 665 {
 666         struct gfs2_inode *ip = jd->jd_inode->u.generic_ip;
 667         struct gfs2_sbd *sdp = ip->i_sbd;
 668         struct gfs2_glock *gl = ip->i_gl;
 669         unsigned int blks = be32_to_cpu(ld->ld_data1);
 670         struct buffer_head *bh_log, *bh_ip;
 671         uint64_t blkno;
 672         uint64_t esc;
 673         int error = 0;
 674
 675         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
 676                 return 0;
 677
 678         gfs2_replay_incr_blk(sdp, &start);
 679         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 680                 blkno = be64_to_cpu(*ptr++);
 681                 esc = be64_to_cpu(*ptr++);
 682
 683                 sdp->sd_found_blocks++;
 684
 685                 if (gfs2_revoke_check(sdp, blkno, start))
 686                         continue;
 687
 688                 error = gfs2_replay_read_block(jd, start, &bh_log);
 689                 if (error)
 690                         return error;
 691
 692                 bh_ip = gfs2_meta_new(gl, blkno);
 693                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 694
 695                 /* Unescape */
 696                 if (esc) {
 697                         __be32 *eptr = (__be32 *)bh_ip->b_data;
 698                         *eptr = cpu_to_be32(GFS2_MAGIC);
 699                 }
 700                 mark_buffer_dirty(bh_ip);
 701
 702                 brelse(bh_log);
 703                 brelse(bh_ip);
 704                 if (error)
 705                         break;
 706
 707                 sdp->sd_replayed_blocks++;
 708         }
 709
 710         return error;
 711 }
 712
 713 /* FIXME: sort out accounting for log blocks etc. */
 714
 715 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 716 {
 717         struct gfs2_inode *ip = jd->jd_inode->u.generic_ip;
 718         struct gfs2_sbd *sdp = ip->i_sbd;
 719
 720         if (error) {
 721                 gfs2_meta_sync(ip->i_gl,
 722                                DIO_START | DIO_WAIT);
 723                 return;
 724         }
 725         if (pass != 1)
 726                 return;
 727
 728         /* data sync? */
 729         gfs2_meta_sync(ip->i_gl, DIO_START | DIO_WAIT);
 730
 731         fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
 732                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
 733 }
 734
 735 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 736 {
 737         struct list_head *head = &sdp->sd_log_le_databuf;
 738         struct gfs2_bufdata *bd;
 739
 740         while (!list_empty(head)) {
 741                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 742                 list_del(&bd->bd_le.le_list);
 743                 sdp->sd_log_num_databuf--;
 744                 sdp->sd_log_num_jdata--;
 745                 gfs2_unpin(sdp, bd->bd_bh, ai);
 746         }
 747         gfs2_assert_warn(sdp, !sdp->sd_log_num_databuf);
 748         gfs2_assert_warn(sdp, !sdp->sd_log_num_jdata);
 749 }
 750
 751
 752 struct gfs2_log_operations gfs2_glock_lops = {
 753         .lo_add = glock_lo_add,
 754         .lo_after_commit = glock_lo_after_commit,
 755         .lo_name = "glock"
 756 };
 757
 758 struct gfs2_log_operations gfs2_buf_lops = {
 759         .lo_add = buf_lo_add,
 760         .lo_incore_commit = buf_lo_incore_commit,
 761         .lo_before_commit = buf_lo_before_commit,
 762         .lo_after_commit = buf_lo_after_commit,
 763         .lo_before_scan = buf_lo_before_scan,
 764         .lo_scan_elements = buf_lo_scan_elements,
 765         .lo_after_scan = buf_lo_after_scan,
 766         .lo_name = "buf"
 767 };
 768
 769 struct gfs2_log_operations gfs2_revoke_lops = {
 770         .lo_add = revoke_lo_add,
 771         .lo_before_commit = revoke_lo_before_commit,
 772         .lo_before_scan = revoke_lo_before_scan,
 773         .lo_scan_elements = revoke_lo_scan_elements,
 774         .lo_after_scan = revoke_lo_after_scan,
 775         .lo_name = "revoke"
 776 };
 777
 778 struct gfs2_log_operations gfs2_rg_lops = {
 779         .lo_add = rg_lo_add,
 780         .lo_after_commit = rg_lo_after_commit,
 781         .lo_name = "rg"
 782 };
 783
 784 struct gfs2_log_operations gfs2_databuf_lops = {
 785         .lo_add = databuf_lo_add,
 786         .lo_incore_commit = buf_lo_incore_commit,
 787         .lo_before_commit = databuf_lo_before_commit,
 788         .lo_after_commit = databuf_lo_after_commit,
 789         .lo_scan_elements = databuf_lo_scan_elements,
 790         .lo_after_scan = databuf_lo_after_scan,
 791         .lo_name = "databuf"
 792 };
 793
 794 struct gfs2_log_operations *gfs2_log_ops[] = {
 795         &gfs2_glock_lops,
 796         &gfs2_buf_lops,
 797         &gfs2_revoke_lops,
 798         &gfs2_rg_lops,
 799         &gfs2_databuf_lops,
 800         NULL
 801 };
 802