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 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
  17 #include "gfs2.h"
  18 #include "lm_interface.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 *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_be32(GFS2_METATYPE_LD);
 295         ld->ld_header.mh_format = cpu_to_be32(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_be32(GFS2_METATYPE_LB);
 317                         mh->mh_format = cpu_to_be32(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                 tr->tr_num_buf_new++;
 478         }
 479         gfs2_log_lock(sdp);
 480         if (!list_empty(&le->le_list)) {
 481                 if (ip->i_di.di_flags & GFS2_DIF_JDATA)
 482                         sdp->sd_log_num_jdata++;
 483                 sdp->sd_log_num_databuf++;
 484                 list_add(&le->le_list, &sdp->sd_log_le_databuf);
 485         }
 486         gfs2_log_unlock(sdp);
 487 }
 488
 489 static int gfs2_check_magic(struct buffer_head *bh)
 490 {
 491         struct page *page = bh->b_page;
 492         void *kaddr;
 493         __be32 *ptr;
 494         int rv = 0;
 495
 496         kaddr = kmap_atomic(page, KM_USER0);
 497         ptr = kaddr + bh_offset(bh);
 498         if (*ptr == cpu_to_be32(GFS2_MAGIC))
 499                 rv = 1;
 500         kunmap_atomic(page, KM_USER0);
 501
 502         return rv;
 503 }
 504
 505 /**
 506  * databuf_lo_before_commit - Scan the data buffers, writing as we go
 507  *
 508  * Here we scan through the lists of buffers and make the assumption
 509  * that any buffer thats been pinned is being journaled, and that
 510  * any unpinned buffer is an ordered write data buffer and therefore
 511  * will be written back rather than journaled.
 512  */
 513 static void databuf_lo_before_commit(struct gfs2_sbd *sdp)
 514 {
 515         LIST_HEAD(started);
 516         struct gfs2_bufdata *bd1 = NULL, *bd2, *bdt;
 517         struct buffer_head *bh = NULL;
 518         unsigned int offset = sizeof(struct gfs2_log_descriptor);
 519         struct gfs2_log_descriptor *ld;
 520         unsigned int limit;
 521         unsigned int total_dbuf = sdp->sd_log_num_databuf;
 522         unsigned int total_jdata = sdp->sd_log_num_jdata;
 523         unsigned int num, n;
 524         __be64 *ptr = NULL;
 525
 526         offset += (2*sizeof(__be64) - 1);
 527         offset &= ~(2*sizeof(__be64) - 1);
 528         limit = (sdp->sd_sb.sb_bsize - offset)/sizeof(__be64);
 529
 530         /*
 531          * Start writing ordered buffers, write journaled buffers
 532          * into the log along with a header
 533          */
 534         gfs2_log_lock(sdp);
 535         bd2 = bd1 = list_prepare_entry(bd1, &sdp->sd_log_le_databuf,
 536                                        bd_le.le_list);
 537         while(total_dbuf) {
 538                 num = total_jdata;
 539                 if (num > limit)
 540                         num = limit;
 541                 n = 0;
 542                 list_for_each_entry_safe_continue(bd1, bdt,
 543                                                   &sdp->sd_log_le_databuf,
 544                                                   bd_le.le_list) {
 545                         /* An ordered write buffer */
 546                         if (bd1->bd_bh && !buffer_pinned(bd1->bd_bh)) {
 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 (bd1->bd_bh) {
 556                                         get_bh(bd1->bd_bh);
 557                                         if (buffer_dirty(bd1->bd_bh)) {
 558                                                 gfs2_log_unlock(sdp);
 559                                                 wait_on_buffer(bd1->bd_bh);
 560                                                 ll_rw_block(WRITE, 1,
 561                                                             &bd1->bd_bh);
 562                                                 gfs2_log_lock(sdp);
 563                                         }
 564                                         brelse(bd1->bd_bh);
 565                                         continue;
 566                                 }
 567                                 continue;
 568                         } else if (bd1->bd_bh) { /* A journaled buffer */
 569                                 int magic;
 570                                 gfs2_log_unlock(sdp);
 571                                 if (!bh) {
 572                                         bh = gfs2_log_get_buf(sdp);
 573                                         sdp->sd_log_num_hdrs++;
 574                                         ld = (struct gfs2_log_descriptor *)
 575                                              bh->b_data;
 576                                         ptr = (__be64 *)(bh->b_data + offset);
 577                                         ld->ld_header.mh_magic =
 578                                                 cpu_to_be32(GFS2_MAGIC);
 579                                         ld->ld_header.mh_type =
 580                                                 cpu_to_be32(GFS2_METATYPE_LD);
 581                                         ld->ld_header.mh_format =
 582                                                 cpu_to_be32(GFS2_FORMAT_LD);
 583                                         ld->ld_type =
 584                                                 cpu_to_be32(GFS2_LOG_DESC_JDATA);
 585                                         ld->ld_length = cpu_to_be32(num + 1);
 586                                         ld->ld_data1 = cpu_to_be32(num);
 587                                         ld->ld_data2 = cpu_to_be32(0);
 588                                         memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
 589                                 }
 590                                 magic = gfs2_check_magic(bd1->bd_bh);
 591                                 *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
 592                                 *ptr++ = cpu_to_be64((__u64)magic);
 593                                 clear_buffer_escaped(bd1->bd_bh);
 594                                 if (unlikely(magic != 0))
 595                                         set_buffer_escaped(bd1->bd_bh);
 596                                 gfs2_log_lock(sdp);
 597                                 if (n++ > num)
 598                                         break;
 599                         }
 600                 }
 601                 gfs2_log_unlock(sdp);
 602                 if (bh) {
 603                         set_buffer_dirty(bh);
 604                         ll_rw_block(WRITE, 1, &bh);
 605                         bh = NULL;
 606                 }
 607                 n = 0;
 608                 gfs2_log_lock(sdp);
 609                 list_for_each_entry_continue(bd2, &sdp->sd_log_le_databuf,
 610                                              bd_le.le_list) {
 611                         if (!bd2->bd_bh)
 612                                 continue;
 613                         /* copy buffer if it needs escaping */
 614                         gfs2_log_unlock(sdp);
 615                         if (unlikely(buffer_escaped(bd2->bd_bh))) {
 616                                 void *kaddr;
 617                                 struct page *page = bd2->bd_bh->b_page;
 618                                 bh = gfs2_log_get_buf(sdp);
 619                                 kaddr = kmap_atomic(page, KM_USER0);
 620                                 memcpy(bh->b_data,
 621                                        kaddr + bh_offset(bd2->bd_bh),
 622                                        sdp->sd_sb.sb_bsize);
 623                                 kunmap_atomic(page, KM_USER0);
 624                                 *(__be32 *)bh->b_data = 0;
 625                         } else {
 626                                 bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
 627                         }
 628                         set_buffer_dirty(bh);
 629                         ll_rw_block(WRITE, 1, &bh);
 630                         gfs2_log_lock(sdp);
 631                         if (++n >= num)
 632                                 break;
 633                 }
 634                 bh = NULL;
 635                 total_dbuf -= num;
 636                 total_jdata -= num;
 637         }
 638         gfs2_log_unlock(sdp);
 639
 640         /* Wait on all ordered buffers */
 641         while (!list_empty(&started)) {
 642                 gfs2_log_lock(sdp);
 643                 bd1 = list_entry(started.next, struct gfs2_bufdata,
 644                                  bd_le.le_list);
 645                 list_del(&bd1->bd_le.le_list);
 646                 sdp->sd_log_num_databuf--;
 647
 648                 bh = bd1->bd_bh;
 649                 if (bh) {
 650                         bh->b_private = NULL;
 651                         gfs2_log_unlock(sdp);
 652                         wait_on_buffer(bh);
 653                         brelse(bh);
 654                 } else
 655                         gfs2_log_unlock(sdp);
 656
 657                 kfree(bd1);
 658         }
 659
 660         /* We've removed all the ordered write bufs here, so only jdata left */
 661         gfs2_assert_warn(sdp, sdp->sd_log_num_databuf == sdp->sd_log_num_jdata);
 662 }
 663
 664 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 665                                     struct gfs2_log_descriptor *ld,
 666                                     __be64 *ptr, int pass)
 667 {
 668         struct gfs2_inode *ip = jd->jd_inode->u.generic_ip;
 669         struct gfs2_sbd *sdp = ip->i_sbd;
 670         struct gfs2_glock *gl = ip->i_gl;
 671         unsigned int blks = be32_to_cpu(ld->ld_data1);
 672         struct buffer_head *bh_log, *bh_ip;
 673         uint64_t blkno;
 674         uint64_t esc;
 675         int error = 0;
 676
 677         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
 678                 return 0;
 679
 680         gfs2_replay_incr_blk(sdp, &start);
 681         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 682                 blkno = be64_to_cpu(*ptr++);
 683                 esc = be64_to_cpu(*ptr++);
 684
 685                 sdp->sd_found_blocks++;
 686
 687                 if (gfs2_revoke_check(sdp, blkno, start))
 688                         continue;
 689
 690                 error = gfs2_replay_read_block(jd, start, &bh_log);
 691                 if (error)
 692                         return error;
 693
 694                 bh_ip = gfs2_meta_new(gl, blkno);
 695                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 696
 697                 /* Unescape */
 698                 if (esc) {
 699                         __be32 *eptr = (__be32 *)bh_ip->b_data;
 700                         *eptr = cpu_to_be32(GFS2_MAGIC);
 701                 }
 702                 mark_buffer_dirty(bh_ip);
 703
 704                 brelse(bh_log);
 705                 brelse(bh_ip);
 706                 if (error)
 707                         break;
 708
 709                 sdp->sd_replayed_blocks++;
 710         }
 711
 712         return error;
 713 }
 714
 715 /* FIXME: sort out accounting for log blocks etc. */
 716
 717 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 718 {
 719         struct gfs2_inode *ip = jd->jd_inode->u.generic_ip;
 720         struct gfs2_sbd *sdp = ip->i_sbd;
 721
 722         if (error) {
 723                 gfs2_meta_sync(ip->i_gl,
 724                                DIO_START | DIO_WAIT);
 725                 return;
 726         }
 727         if (pass != 1)
 728                 return;
 729
 730         /* data sync? */
 731         gfs2_meta_sync(ip->i_gl, DIO_START | DIO_WAIT);
 732
 733         fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
 734                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
 735 }
 736
 737 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 738 {
 739         struct list_head *head = &sdp->sd_log_le_databuf;
 740         struct gfs2_bufdata *bd;
 741
 742         while (!list_empty(head)) {
 743                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 744                 list_del(&bd->bd_le.le_list);
 745                 sdp->sd_log_num_databuf--;
 746                 sdp->sd_log_num_jdata--;
 747                 gfs2_unpin(sdp, bd->bd_bh, ai);
 748         }
 749         gfs2_assert_warn(sdp, !sdp->sd_log_num_databuf);
 750         gfs2_assert_warn(sdp, !sdp->sd_log_num_jdata);
 751 }
 752
 753
 754 const struct gfs2_log_operations gfs2_glock_lops = {
 755         .lo_add = glock_lo_add,
 756         .lo_after_commit = glock_lo_after_commit,
 757         .lo_name = "glock"
 758 };
 759
 760 const struct gfs2_log_operations gfs2_buf_lops = {
 761         .lo_add = buf_lo_add,
 762         .lo_incore_commit = buf_lo_incore_commit,
 763         .lo_before_commit = buf_lo_before_commit,
 764         .lo_after_commit = buf_lo_after_commit,
 765         .lo_before_scan = buf_lo_before_scan,
 766         .lo_scan_elements = buf_lo_scan_elements,
 767         .lo_after_scan = buf_lo_after_scan,
 768         .lo_name = "buf"
 769 };
 770
 771 const struct gfs2_log_operations gfs2_revoke_lops = {
 772         .lo_add = revoke_lo_add,
 773         .lo_before_commit = revoke_lo_before_commit,
 774         .lo_before_scan = revoke_lo_before_scan,
 775         .lo_scan_elements = revoke_lo_scan_elements,
 776         .lo_after_scan = revoke_lo_after_scan,
 777         .lo_name = "revoke"
 778 };
 779
 780 const struct gfs2_log_operations gfs2_rg_lops = {
 781         .lo_add = rg_lo_add,
 782         .lo_after_commit = rg_lo_after_commit,
 783         .lo_name = "rg"
 784 };
 785
 786 const struct gfs2_log_operations gfs2_databuf_lops = {
 787         .lo_add = databuf_lo_add,
 788         .lo_incore_commit = buf_lo_incore_commit,
 789         .lo_before_commit = databuf_lo_before_commit,
 790         .lo_after_commit = databuf_lo_after_commit,
 791         .lo_scan_elements = databuf_lo_scan_elements,
 792         .lo_after_scan = databuf_lo_after_scan,
 793         .lo_name = "databuf"
 794 };
 795
 796 const struct gfs2_log_operations *gfs2_log_ops[] = {
 797         &gfs2_glock_lops,
 798         &gfs2_buf_lops,
 799         &gfs2_revoke_lops,
 800         &gfs2_rg_lops,
 801         &gfs2_databuf_lops,
 802         NULL
 803 };
 804