git.oblomov.eu Git - linux-2.6/blob - fs/ocfs2/super.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * super.c
   5  *
   6  * load/unload driver, mount/dismount volumes
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <linux/highmem.h>
  31 #include <linux/utsname.h>
  32 #include <linux/init.h>
  33 #include <linux/random.h>
  34 #include <linux/statfs.h>
  35 #include <linux/moduleparam.h>
  36 #include <linux/blkdev.h>
  37 #include <linux/socket.h>
  38 #include <linux/inet.h>
  39 #include <linux/parser.h>
  40 #include <linux/crc32.h>
  41 #include <linux/debugfs.h>
  42 #include <linux/mount.h>
  43
  44 #include <cluster/nodemanager.h>
  45
  46 #define MLOG_MASK_PREFIX ML_SUPER
  47 #include <cluster/masklog.h>
  48
  49 #include "ocfs2.h"
  50
  51 /* this should be the only file to include a version 1 header */
  52 #include "ocfs1_fs_compat.h"
  53
  54 #include "alloc.h"
  55 #include "dlmglue.h"
  56 #include "export.h"
  57 #include "extent_map.h"
  58 #include "heartbeat.h"
  59 #include "inode.h"
  60 #include "journal.h"
  61 #include "localalloc.h"
  62 #include "namei.h"
  63 #include "slot_map.h"
  64 #include "super.h"
  65 #include "sysfile.h"
  66 #include "uptodate.h"
  67 #include "ver.h"
  68 #include "vote.h"
  69
  70 #include "buffer_head_io.h"
  71
  72 static struct kmem_cache *ocfs2_inode_cachep = NULL;
  73
  74 /* OCFS2 needs to schedule several differnt types of work which
  75  * require cluster locking, disk I/O, recovery waits, etc. Since these
  76  * types of work tend to be heavy we avoid using the kernel events
  77  * workqueue and schedule on our own. */
  78 struct workqueue_struct *ocfs2_wq = NULL;
  79
  80 static struct dentry *ocfs2_debugfs_root = NULL;
  81
  82 MODULE_AUTHOR("Oracle");
  83 MODULE_LICENSE("GPL");
  84
  85 struct mount_options
  86 {
  87         unsigned long   mount_opt;
  88         unsigned int    atime_quantum;
  89         signed short    slot;
  90 };
  91
  92 static int ocfs2_parse_options(struct super_block *sb, char *options,
  93                                struct mount_options *mopt,
  94                                int is_remount);
  95 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
  96 static void ocfs2_put_super(struct super_block *sb);
  97 static int ocfs2_mount_volume(struct super_block *sb);
  98 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
  99 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 100 static int ocfs2_initialize_mem_caches(void);
 101 static void ocfs2_free_mem_caches(void);
 102 static void ocfs2_delete_osb(struct ocfs2_super *osb);
 103
 104 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 105
 106 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 107
 108 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 109 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 110 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 111 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb);
 112 static int ocfs2_check_volume(struct ocfs2_super *osb);
 113 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 114                                struct buffer_head *bh,
 115                                u32 sectsize);
 116 static int ocfs2_initialize_super(struct super_block *sb,
 117                                   struct buffer_head *bh,
 118                                   int sector_size);
 119 static int ocfs2_get_sector(struct super_block *sb,
 120                             struct buffer_head **bh,
 121                             int block,
 122                             int sect_size);
 123 static void ocfs2_write_super(struct super_block *sb);
 124 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 125 static void ocfs2_destroy_inode(struct inode *inode);
 126
 127 static const struct super_operations ocfs2_sops = {
 128         .statfs         = ocfs2_statfs,
 129         .alloc_inode    = ocfs2_alloc_inode,
 130         .destroy_inode  = ocfs2_destroy_inode,
 131         .drop_inode     = ocfs2_drop_inode,
 132         .clear_inode    = ocfs2_clear_inode,
 133         .delete_inode   = ocfs2_delete_inode,
 134         .sync_fs        = ocfs2_sync_fs,
 135         .write_super    = ocfs2_write_super,
 136         .put_super      = ocfs2_put_super,
 137         .remount_fs     = ocfs2_remount,
 138         .show_options   = ocfs2_show_options,
 139 };
 140
 141 enum {
 142         Opt_barrier,
 143         Opt_err_panic,
 144         Opt_err_ro,
 145         Opt_intr,
 146         Opt_nointr,
 147         Opt_hb_none,
 148         Opt_hb_local,
 149         Opt_data_ordered,
 150         Opt_data_writeback,
 151         Opt_atime_quantum,
 152         Opt_slot,
 153         Opt_err,
 154 };
 155
 156 static match_table_t tokens = {
 157         {Opt_barrier, "barrier=%u"},
 158         {Opt_err_panic, "errors=panic"},
 159         {Opt_err_ro, "errors=remount-ro"},
 160         {Opt_intr, "intr"},
 161         {Opt_nointr, "nointr"},
 162         {Opt_hb_none, OCFS2_HB_NONE},
 163         {Opt_hb_local, OCFS2_HB_LOCAL},
 164         {Opt_data_ordered, "data=ordered"},
 165         {Opt_data_writeback, "data=writeback"},
 166         {Opt_atime_quantum, "atime_quantum=%u"},
 167         {Opt_slot, "preferred_slot=%u"},
 168         {Opt_err, NULL}
 169 };
 170
 171 /*
 172  * write_super and sync_fs ripped right out of ext3.
 173  */
 174 static void ocfs2_write_super(struct super_block *sb)
 175 {
 176         if (mutex_trylock(&sb->s_lock) != 0)
 177                 BUG();
 178         sb->s_dirt = 0;
 179 }
 180
 181 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 182 {
 183         int status;
 184         tid_t target;
 185         struct ocfs2_super *osb = OCFS2_SB(sb);
 186
 187         sb->s_dirt = 0;
 188
 189         if (ocfs2_is_hard_readonly(osb))
 190                 return -EROFS;
 191
 192         if (wait) {
 193                 status = ocfs2_flush_truncate_log(osb);
 194                 if (status < 0)
 195                         mlog_errno(status);
 196         } else {
 197                 ocfs2_schedule_truncate_log_flush(osb, 0);
 198         }
 199
 200         if (journal_start_commit(OCFS2_SB(sb)->journal->j_journal, &target)) {
 201                 if (wait)
 202                         log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 203                                         target);
 204         }
 205         return 0;
 206 }
 207
 208 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 209 {
 210         struct inode *new = NULL;
 211         int status = 0;
 212         int i;
 213
 214         mlog_entry_void();
 215
 216         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE);
 217         if (IS_ERR(new)) {
 218                 status = PTR_ERR(new);
 219                 mlog_errno(status);
 220                 goto bail;
 221         }
 222         osb->root_inode = new;
 223
 224         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE);
 225         if (IS_ERR(new)) {
 226                 status = PTR_ERR(new);
 227                 mlog_errno(status);
 228                 goto bail;
 229         }
 230         osb->sys_root_inode = new;
 231
 232         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 233              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 234                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 235                 if (!new) {
 236                         ocfs2_release_system_inodes(osb);
 237                         status = -EINVAL;
 238                         mlog_errno(status);
 239                         /* FIXME: Should ERROR_RO_FS */
 240                         mlog(ML_ERROR, "Unable to load system inode %d, "
 241                              "possibly corrupt fs?", i);
 242                         goto bail;
 243                 }
 244                 // the array now has one ref, so drop this one
 245                 iput(new);
 246         }
 247
 248 bail:
 249         mlog_exit(status);
 250         return status;
 251 }
 252
 253 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 254 {
 255         struct inode *new = NULL;
 256         int status = 0;
 257         int i;
 258
 259         mlog_entry_void();
 260
 261         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 262              i < NUM_SYSTEM_INODES;
 263              i++) {
 264                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 265                 if (!new) {
 266                         ocfs2_release_system_inodes(osb);
 267                         status = -EINVAL;
 268                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 269                              status, i, osb->slot_num);
 270                         goto bail;
 271                 }
 272                 /* the array now has one ref, so drop this one */
 273                 iput(new);
 274         }
 275
 276 bail:
 277         mlog_exit(status);
 278         return status;
 279 }
 280
 281 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 282 {
 283         int i;
 284         struct inode *inode;
 285
 286         mlog_entry_void();
 287
 288         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 289                 inode = osb->system_inodes[i];
 290                 if (inode) {
 291                         iput(inode);
 292                         osb->system_inodes[i] = NULL;
 293                 }
 294         }
 295
 296         inode = osb->sys_root_inode;
 297         if (inode) {
 298                 iput(inode);
 299                 osb->sys_root_inode = NULL;
 300         }
 301
 302         inode = osb->root_inode;
 303         if (inode) {
 304                 iput(inode);
 305                 osb->root_inode = NULL;
 306         }
 307
 308         mlog_exit(0);
 309 }
 310
 311 /* We're allocating fs objects, use GFP_NOFS */
 312 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 313 {
 314         struct ocfs2_inode_info *oi;
 315
 316         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 317         if (!oi)
 318                 return NULL;
 319
 320         return &oi->vfs_inode;
 321 }
 322
 323 static void ocfs2_destroy_inode(struct inode *inode)
 324 {
 325         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 326 }
 327
 328 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 329                                                 unsigned int cbits)
 330 {
 331         unsigned int bytes = 1 << cbits;
 332         unsigned int trim = bytes;
 333         unsigned int bitshift = 32;
 334
 335         /*
 336          * i_size and all block offsets in ocfs2 are always 64 bits
 337          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 338          * 64 bit platforms, cluster size will be the limiting factor.
 339          */
 340
 341 #if BITS_PER_LONG == 32
 342 # if defined(CONFIG_LBD)
 343         BUILD_BUG_ON(sizeof(sector_t) != 8);
 344         /*
 345          * We might be limited by page cache size.
 346          */
 347         if (bytes > PAGE_CACHE_SIZE) {
 348                 bytes = PAGE_CACHE_SIZE;
 349                 trim = 1;
 350                 /*
 351                  * Shift by 31 here so that we don't get larger than
 352                  * MAX_LFS_FILESIZE
 353                  */
 354                 bitshift = 31;
 355         }
 356 # else
 357         /*
 358          * We are limited by the size of sector_t. Use block size, as
 359          * that's what we expose to the VFS.
 360          */
 361         bytes = 1 << bbits;
 362         trim = 1;
 363         bitshift = 31;
 364 # endif
 365 #endif
 366
 367         /*
 368          * Trim by a whole cluster when we can actually approach the
 369          * on-disk limits. Otherwise we can overflow i_clusters when
 370          * an extent start is at the max offset.
 371          */
 372         return (((unsigned long long)bytes) << bitshift) - trim;
 373 }
 374
 375 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 376 {
 377         int incompat_features;
 378         int ret = 0;
 379         struct mount_options parsed_options;
 380         struct ocfs2_super *osb = OCFS2_SB(sb);
 381
 382         if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
 383                 ret = -EINVAL;
 384                 goto out;
 385         }
 386
 387         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 388             (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 389                 ret = -EINVAL;
 390                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 391                 goto out;
 392         }
 393
 394         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 395             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 396                 ret = -EINVAL;
 397                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 398                 goto out;
 399         }
 400
 401         /* We're going to/from readonly mode. */
 402         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 403                 /* Lock here so the check of HARD_RO and the potential
 404                  * setting of SOFT_RO is atomic. */
 405                 spin_lock(&osb->osb_lock);
 406                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 407                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 408                         ret = -EROFS;
 409                         goto unlock_osb;
 410                 }
 411
 412                 if (*flags & MS_RDONLY) {
 413                         mlog(0, "Going to ro mode.\n");
 414                         sb->s_flags |= MS_RDONLY;
 415                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 416                 } else {
 417                         mlog(0, "Making ro filesystem writeable.\n");
 418
 419                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 420                                 mlog(ML_ERROR, "Cannot remount RDWR "
 421                                      "filesystem due to previous errors.\n");
 422                                 ret = -EROFS;
 423                                 goto unlock_osb;
 424                         }
 425                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 426                         if (incompat_features) {
 427                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 428                                      "of unsupported optional features "
 429                                      "(%x).\n", incompat_features);
 430                                 ret = -EINVAL;
 431                                 goto unlock_osb;
 432                         }
 433                         sb->s_flags &= ~MS_RDONLY;
 434                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 435                 }
 436 unlock_osb:
 437                 spin_unlock(&osb->osb_lock);
 438         }
 439
 440         if (!ret) {
 441                 if (!ocfs2_is_hard_readonly(osb))
 442                         ocfs2_set_journal_params(osb);
 443
 444                 /* Only save off the new mount options in case of a successful
 445                  * remount. */
 446                 osb->s_mount_opt = parsed_options.mount_opt;
 447                 osb->s_atime_quantum = parsed_options.atime_quantum;
 448                 osb->preferred_slot = parsed_options.slot;
 449         }
 450 out:
 451         return ret;
 452 }
 453
 454 static int ocfs2_sb_probe(struct super_block *sb,
 455                           struct buffer_head **bh,
 456                           int *sector_size)
 457 {
 458         int status, tmpstat;
 459         struct ocfs1_vol_disk_hdr *hdr;
 460         struct ocfs2_dinode *di;
 461         int blksize;
 462
 463         *bh = NULL;
 464
 465         /* may be > 512 */
 466         *sector_size = bdev_hardsect_size(sb->s_bdev);
 467         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 468                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 469                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 470                 status = -EINVAL;
 471                 goto bail;
 472         }
 473
 474         /* Can this really happen? */
 475         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 476                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 477
 478         /* check block zero for old format */
 479         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 480         if (status < 0) {
 481                 mlog_errno(status);
 482                 goto bail;
 483         }
 484         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 485         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 486                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 487                      hdr->major_version, hdr->minor_version);
 488                 status = -EINVAL;
 489         }
 490         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 491                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 492                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 493                      hdr->signature);
 494                 status = -EINVAL;
 495         }
 496         brelse(*bh);
 497         *bh = NULL;
 498         if (status < 0) {
 499                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 500                      "upgraded before mounting with ocfs v2\n");
 501                 goto bail;
 502         }
 503
 504         /*
 505          * Now check at magic offset for 512, 1024, 2048, 4096
 506          * blocksizes.  4096 is the maximum blocksize because it is
 507          * the minimum clustersize.
 508          */
 509         status = -EINVAL;
 510         for (blksize = *sector_size;
 511              blksize <= OCFS2_MAX_BLOCKSIZE;
 512              blksize <<= 1) {
 513                 tmpstat = ocfs2_get_sector(sb, bh,
 514                                            OCFS2_SUPER_BLOCK_BLKNO,
 515                                            blksize);
 516                 if (tmpstat < 0) {
 517                         status = tmpstat;
 518                         mlog_errno(status);
 519                         goto bail;
 520                 }
 521                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 522                 status = ocfs2_verify_volume(di, *bh, blksize);
 523                 if (status >= 0)
 524                         goto bail;
 525                 brelse(*bh);
 526                 *bh = NULL;
 527                 if (status != -EAGAIN)
 528                         break;
 529         }
 530
 531 bail:
 532         return status;
 533 }
 534
 535 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 536 {
 537         if (ocfs2_mount_local(osb)) {
 538                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 539                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 540                              "mounted device.\n");
 541                         return -EINVAL;
 542                 }
 543         }
 544
 545         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 546                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb)) {
 547                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 548                              "a read-write clustered device.\n");
 549                         return -EINVAL;
 550                 }
 551         }
 552
 553         return 0;
 554 }
 555
 556 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 557 {
 558         struct dentry *root;
 559         int status, sector_size;
 560         struct mount_options parsed_options;
 561         struct inode *inode = NULL;
 562         struct ocfs2_super *osb = NULL;
 563         struct buffer_head *bh = NULL;
 564         char nodestr[8];
 565
 566         mlog_entry("%p, %p, %i", sb, data, silent);
 567
 568         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
 569                 status = -EINVAL;
 570                 goto read_super_error;
 571         }
 572
 573         /* for now we only have one cluster/node, make sure we see it
 574          * in the heartbeat universe */
 575         if (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 576                 if (!o2hb_check_local_node_heartbeating()) {
 577                         status = -EINVAL;
 578                         goto read_super_error;
 579                 }
 580         }
 581
 582         /* probe for superblock */
 583         status = ocfs2_sb_probe(sb, &bh, &sector_size);
 584         if (status < 0) {
 585                 mlog(ML_ERROR, "superblock probe failed!\n");
 586                 goto read_super_error;
 587         }
 588
 589         status = ocfs2_initialize_super(sb, bh, sector_size);
 590         osb = OCFS2_SB(sb);
 591         if (status < 0) {
 592                 mlog_errno(status);
 593                 goto read_super_error;
 594         }
 595         brelse(bh);
 596         bh = NULL;
 597         osb->s_mount_opt = parsed_options.mount_opt;
 598         osb->s_atime_quantum = parsed_options.atime_quantum;
 599         osb->preferred_slot = parsed_options.slot;
 600
 601         sb->s_magic = OCFS2_SUPER_MAGIC;
 602
 603         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
 604          * heartbeat=none */
 605         if (bdev_read_only(sb->s_bdev)) {
 606                 if (!(sb->s_flags & MS_RDONLY)) {
 607                         status = -EACCES;
 608                         mlog(ML_ERROR, "Readonly device detected but readonly "
 609                              "mount was not specified.\n");
 610                         goto read_super_error;
 611                 }
 612
 613                 /* You should not be able to start a local heartbeat
 614                  * on a readonly device. */
 615                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 616                         status = -EROFS;
 617                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
 618                              "device.\n");
 619                         goto read_super_error;
 620                 }
 621
 622                 status = ocfs2_check_journals_nolocks(osb);
 623                 if (status < 0) {
 624                         if (status == -EROFS)
 625                                 mlog(ML_ERROR, "Recovery required on readonly "
 626                                      "file system, but write access is "
 627                                      "unavailable.\n");
 628                         else
 629                                 mlog_errno(status);
 630                         goto read_super_error;
 631                 }
 632
 633                 ocfs2_set_ro_flag(osb, 1);
 634
 635                 printk(KERN_NOTICE "Readonly device detected. No cluster "
 636                        "services will be utilized for this mount. Recovery "
 637                        "will be skipped.\n");
 638         }
 639
 640         if (!ocfs2_is_hard_readonly(osb)) {
 641                 if (sb->s_flags & MS_RDONLY)
 642                         ocfs2_set_ro_flag(osb, 0);
 643         }
 644
 645         status = ocfs2_verify_heartbeat(osb);
 646         if (status < 0) {
 647                 mlog_errno(status);
 648                 goto read_super_error;
 649         }
 650
 651         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
 652                                                  ocfs2_debugfs_root);
 653         if (!osb->osb_debug_root) {
 654                 status = -EINVAL;
 655                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
 656                 goto read_super_error;
 657         }
 658
 659         status = ocfs2_mount_volume(sb);
 660         if (osb->root_inode)
 661                 inode = igrab(osb->root_inode);
 662
 663         if (status < 0)
 664                 goto read_super_error;
 665
 666         if (!inode) {
 667                 status = -EIO;
 668                 mlog_errno(status);
 669                 goto read_super_error;
 670         }
 671
 672         root = d_alloc_root(inode);
 673         if (!root) {
 674                 status = -ENOMEM;
 675                 mlog_errno(status);
 676                 goto read_super_error;
 677         }
 678
 679         sb->s_root = root;
 680
 681         ocfs2_complete_mount_recovery(osb);
 682
 683         if (ocfs2_mount_local(osb))
 684                 snprintf(nodestr, sizeof(nodestr), "local");
 685         else
 686                 snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);
 687
 688         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
 689                "with %s data mode.\n",
 690                osb->dev_str, nodestr, osb->slot_num,
 691                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
 692                "ordered");
 693
 694         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
 695         wake_up(&osb->osb_mount_event);
 696
 697         mlog_exit(status);
 698         return status;
 699
 700 read_super_error:
 701         if (bh != NULL)
 702                 brelse(bh);
 703
 704         if (inode)
 705                 iput(inode);
 706
 707         if (osb) {
 708                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
 709                 wake_up(&osb->osb_mount_event);
 710                 ocfs2_dismount_volume(sb, 1);
 711         }
 712
 713         mlog_exit(status);
 714         return status;
 715 }
 716
 717 static int ocfs2_get_sb(struct file_system_type *fs_type,
 718                         int flags,
 719                         const char *dev_name,
 720                         void *data,
 721                         struct vfsmount *mnt)
 722 {
 723         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
 724                            mnt);
 725 }
 726
 727 static struct file_system_type ocfs2_fs_type = {
 728         .owner          = THIS_MODULE,
 729         .name           = "ocfs2",
 730         .get_sb         = ocfs2_get_sb, /* is this called when we mount
 731                                         * the fs? */
 732         .kill_sb        = kill_block_super, /* set to the generic one
 733                                              * right now, but do we
 734                                              * need to change that? */
 735         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
 736         .next           = NULL
 737 };
 738
 739 static int ocfs2_parse_options(struct super_block *sb,
 740                                char *options,
 741                                struct mount_options *mopt,
 742                                int is_remount)
 743 {
 744         int status;
 745         char *p;
 746
 747         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
 748                    options ? options : "(none)");
 749
 750         mopt->mount_opt = 0;
 751         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
 752         mopt->slot = OCFS2_INVALID_SLOT;
 753
 754         if (!options) {
 755                 status = 1;
 756                 goto bail;
 757         }
 758
 759         while ((p = strsep(&options, ",")) != NULL) {
 760                 int token, option;
 761                 substring_t args[MAX_OPT_ARGS];
 762
 763                 if (!*p)
 764                         continue;
 765
 766                 token = match_token(p, tokens, args);
 767                 switch (token) {
 768                 case Opt_hb_local:
 769                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
 770                         break;
 771                 case Opt_hb_none:
 772                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
 773                         break;
 774                 case Opt_barrier:
 775                         if (match_int(&args[0], &option)) {
 776                                 status = 0;
 777                                 goto bail;
 778                         }
 779                         if (option)
 780                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
 781                         else
 782                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
 783                         break;
 784                 case Opt_intr:
 785                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
 786                         break;
 787                 case Opt_nointr:
 788                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
 789                         break;
 790                 case Opt_err_panic:
 791                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
 792                         break;
 793                 case Opt_err_ro:
 794                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
 795                         break;
 796                 case Opt_data_ordered:
 797                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
 798                         break;
 799                 case Opt_data_writeback:
 800                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
 801                         break;
 802                 case Opt_atime_quantum:
 803                         if (match_int(&args[0], &option)) {
 804                                 status = 0;
 805                                 goto bail;
 806                         }
 807                         if (option >= 0)
 808                                 mopt->atime_quantum = option;
 809                         break;
 810                 case Opt_slot:
 811                         option = 0;
 812                         if (match_int(&args[0], &option)) {
 813                                 status = 0;
 814                                 goto bail;
 815                         }
 816                         if (option)
 817                                 mopt->slot = (s16)option;
 818                         break;
 819                 default:
 820                         mlog(ML_ERROR,
 821                              "Unrecognized mount option \"%s\" "
 822                              "or missing value\n", p);
 823                         status = 0;
 824                         goto bail;
 825                 }
 826         }
 827
 828         status = 1;
 829
 830 bail:
 831         mlog_exit(status);
 832         return status;
 833 }
 834
 835 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
 836 {
 837         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
 838         unsigned long opts = osb->s_mount_opt;
 839
 840         if (opts & OCFS2_MOUNT_HB_LOCAL)
 841                 seq_printf(s, ",_netdev,heartbeat=local");
 842         else
 843                 seq_printf(s, ",heartbeat=none");
 844
 845         if (opts & OCFS2_MOUNT_NOINTR)
 846                 seq_printf(s, ",nointr");
 847
 848         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
 849                 seq_printf(s, ",data=writeback");
 850         else
 851                 seq_printf(s, ",data=ordered");
 852
 853         if (opts & OCFS2_MOUNT_BARRIER)
 854                 seq_printf(s, ",barrier=1");
 855
 856         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
 857                 seq_printf(s, ",errors=panic");
 858         else
 859                 seq_printf(s, ",errors=remount-ro");
 860
 861         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
 862                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
 863
 864         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
 865                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
 866
 867         return 0;
 868 }
 869
 870 static int __init ocfs2_init(void)
 871 {
 872         int status;
 873
 874         mlog_entry_void();
 875
 876         ocfs2_print_version();
 877
 878         status = init_ocfs2_uptodate_cache();
 879         if (status < 0) {
 880                 mlog_errno(status);
 881                 goto leave;
 882         }
 883
 884         status = ocfs2_initialize_mem_caches();
 885         if (status < 0) {
 886                 mlog_errno(status);
 887                 goto leave;
 888         }
 889
 890         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
 891         if (!ocfs2_wq) {
 892                 status = -ENOMEM;
 893                 goto leave;
 894         }
 895
 896         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
 897         if (!ocfs2_debugfs_root) {
 898                 status = -EFAULT;
 899                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
 900         }
 901
 902 leave:
 903         if (status < 0) {
 904                 ocfs2_free_mem_caches();
 905                 exit_ocfs2_uptodate_cache();
 906         }
 907
 908         mlog_exit(status);
 909
 910         if (status >= 0) {
 911                 return register_filesystem(&ocfs2_fs_type);
 912         } else
 913                 return -1;
 914 }
 915
 916 static void __exit ocfs2_exit(void)
 917 {
 918         mlog_entry_void();
 919
 920         if (ocfs2_wq) {
 921                 flush_workqueue(ocfs2_wq);
 922                 destroy_workqueue(ocfs2_wq);
 923         }
 924
 925         debugfs_remove(ocfs2_debugfs_root);
 926
 927         ocfs2_free_mem_caches();
 928
 929         unregister_filesystem(&ocfs2_fs_type);
 930
 931         exit_ocfs2_uptodate_cache();
 932
 933         mlog_exit_void();
 934 }
 935
 936 static void ocfs2_put_super(struct super_block *sb)
 937 {
 938         mlog_entry("(0x%p)\n", sb);
 939
 940         ocfs2_sync_blockdev(sb);
 941         ocfs2_dismount_volume(sb, 0);
 942
 943         mlog_exit_void();
 944 }
 945
 946 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
 947 {
 948         struct ocfs2_super *osb;
 949         u32 numbits, freebits;
 950         int status;
 951         struct ocfs2_dinode *bm_lock;
 952         struct buffer_head *bh = NULL;
 953         struct inode *inode = NULL;
 954
 955         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
 956
 957         osb = OCFS2_SB(dentry->d_sb);
 958
 959         inode = ocfs2_get_system_file_inode(osb,
 960                                             GLOBAL_BITMAP_SYSTEM_INODE,
 961                                             OCFS2_INVALID_SLOT);
 962         if (!inode) {
 963                 mlog(ML_ERROR, "failed to get bitmap inode\n");
 964                 status = -EIO;
 965                 goto bail;
 966         }
 967
 968         status = ocfs2_meta_lock(inode, &bh, 0);
 969         if (status < 0) {
 970                 mlog_errno(status);
 971                 goto bail;
 972         }
 973
 974         bm_lock = (struct ocfs2_dinode *) bh->b_data;
 975
 976         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
 977         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
 978
 979         buf->f_type = OCFS2_SUPER_MAGIC;
 980         buf->f_bsize = dentry->d_sb->s_blocksize;
 981         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
 982         buf->f_blocks = ((sector_t) numbits) *
 983                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
 984         buf->f_bfree = ((sector_t) freebits) *
 985                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
 986         buf->f_bavail = buf->f_bfree;
 987         buf->f_files = numbits;
 988         buf->f_ffree = freebits;
 989
 990         brelse(bh);
 991
 992         ocfs2_meta_unlock(inode, 0);
 993         status = 0;
 994 bail:
 995         if (inode)
 996                 iput(inode);
 997
 998         mlog_exit(status);
 999
1000         return status;
1001 }
1002
1003 static void ocfs2_inode_init_once(void *data,
1004                                   struct kmem_cache *cachep,
1005                                   unsigned long flags)
1006 {
1007         struct ocfs2_inode_info *oi = data;
1008
1009         oi->ip_flags = 0;
1010         oi->ip_open_count = 0;
1011         spin_lock_init(&oi->ip_lock);
1012         ocfs2_extent_map_init(&oi->vfs_inode);
1013         INIT_LIST_HEAD(&oi->ip_io_markers);
1014         oi->ip_created_trans = 0;
1015         oi->ip_last_trans = 0;
1016         oi->ip_dir_start_lookup = 0;
1017
1018         init_rwsem(&oi->ip_alloc_sem);
1019         mutex_init(&oi->ip_io_mutex);
1020
1021         oi->ip_blkno = 0ULL;
1022         oi->ip_clusters = 0;
1023
1024         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1025         ocfs2_lock_res_init_once(&oi->ip_meta_lockres);
1026         ocfs2_lock_res_init_once(&oi->ip_data_lockres);
1027         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1028
1029         ocfs2_metadata_cache_init(&oi->vfs_inode);
1030
1031         inode_init_once(&oi->vfs_inode);
1032 }
1033
1034 static int ocfs2_initialize_mem_caches(void)
1035 {
1036         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1037                                        sizeof(struct ocfs2_inode_info),
1038                                        0,
1039                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1040                                                 SLAB_MEM_SPREAD),
1041                                        ocfs2_inode_init_once);
1042         if (!ocfs2_inode_cachep)
1043                 return -ENOMEM;
1044
1045         return 0;
1046 }
1047
1048 static void ocfs2_free_mem_caches(void)
1049 {
1050         if (ocfs2_inode_cachep)
1051                 kmem_cache_destroy(ocfs2_inode_cachep);
1052
1053         ocfs2_inode_cachep = NULL;
1054 }
1055
1056 static int ocfs2_get_sector(struct super_block *sb,
1057                             struct buffer_head **bh,
1058                             int block,
1059                             int sect_size)
1060 {
1061         if (!sb_set_blocksize(sb, sect_size)) {
1062                 mlog(ML_ERROR, "unable to set blocksize\n");
1063                 return -EIO;
1064         }
1065
1066         *bh = sb_getblk(sb, block);
1067         if (!*bh) {
1068                 mlog_errno(-EIO);
1069                 return -EIO;
1070         }
1071         lock_buffer(*bh);
1072         if (!buffer_dirty(*bh))
1073                 clear_buffer_uptodate(*bh);
1074         unlock_buffer(*bh);
1075         ll_rw_block(READ, 1, bh);
1076         wait_on_buffer(*bh);
1077         return 0;
1078 }
1079
1080 /* ocfs2 1.0 only allows one cluster and node identity per kernel image. */
1081 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb)
1082 {
1083         int status;
1084
1085         /* XXX hold a ref on the node while mounte?  easy enough, if
1086          * desirable. */
1087         if (ocfs2_mount_local(osb))
1088                 osb->node_num = 0;
1089         else
1090                 osb->node_num = o2nm_this_node();
1091
1092         if (osb->node_num == O2NM_MAX_NODES) {
1093                 mlog(ML_ERROR, "could not find this host's node number\n");
1094                 status = -ENOENT;
1095                 goto bail;
1096         }
1097
1098         mlog(0, "I am node %d\n", osb->node_num);
1099
1100         status = 0;
1101 bail:
1102         return status;
1103 }
1104
1105 static int ocfs2_mount_volume(struct super_block *sb)
1106 {
1107         int status = 0;
1108         int unlock_super = 0;
1109         struct ocfs2_super *osb = OCFS2_SB(sb);
1110
1111         mlog_entry_void();
1112
1113         if (ocfs2_is_hard_readonly(osb))
1114                 goto leave;
1115
1116         status = ocfs2_fill_local_node_info(osb);
1117         if (status < 0) {
1118                 mlog_errno(status);
1119                 goto leave;
1120         }
1121
1122         status = ocfs2_register_hb_callbacks(osb);
1123         if (status < 0) {
1124                 mlog_errno(status);
1125                 goto leave;
1126         }
1127
1128         status = ocfs2_dlm_init(osb);
1129         if (status < 0) {
1130                 mlog_errno(status);
1131                 goto leave;
1132         }
1133
1134         /* requires vote_thread to be running. */
1135         status = ocfs2_register_net_handlers(osb);
1136         if (status < 0) {
1137                 mlog_errno(status);
1138                 goto leave;
1139         }
1140
1141         status = ocfs2_super_lock(osb, 1);
1142         if (status < 0) {
1143                 mlog_errno(status);
1144                 goto leave;
1145         }
1146         unlock_super = 1;
1147
1148         /* This will load up the node map and add ourselves to it. */
1149         status = ocfs2_find_slot(osb);
1150         if (status < 0) {
1151                 mlog_errno(status);
1152                 goto leave;
1153         }
1154
1155         ocfs2_populate_mounted_map(osb);
1156
1157         /* load all node-local system inodes */
1158         status = ocfs2_init_local_system_inodes(osb);
1159         if (status < 0) {
1160                 mlog_errno(status);
1161                 goto leave;
1162         }
1163
1164         status = ocfs2_check_volume(osb);
1165         if (status < 0) {
1166                 mlog_errno(status);
1167                 goto leave;
1168         }
1169
1170         status = ocfs2_truncate_log_init(osb);
1171         if (status < 0) {
1172                 mlog_errno(status);
1173                 goto leave;
1174         }
1175
1176         if (ocfs2_mount_local(osb))
1177                 goto leave;
1178
1179         /* This should be sent *after* we recovered our journal as it
1180          * will cause other nodes to unmark us as needing
1181          * recovery. However, we need to send it *before* dropping the
1182          * super block lock as otherwise their recovery threads might
1183          * try to clean us up while we're live! */
1184         status = ocfs2_request_mount_vote(osb);
1185         if (status < 0)
1186                 mlog_errno(status);
1187
1188 leave:
1189         if (unlock_super)
1190                 ocfs2_super_unlock(osb, 1);
1191
1192         mlog_exit(status);
1193         return status;
1194 }
1195
1196 /* we can't grab the goofy sem lock from inside wait_event, so we use
1197  * memory barriers to make sure that we'll see the null task before
1198  * being woken up */
1199 static int ocfs2_recovery_thread_running(struct ocfs2_super *osb)
1200 {
1201         mb();
1202         return osb->recovery_thread_task != NULL;
1203 }
1204
1205 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1206 {
1207         int tmp;
1208         struct ocfs2_super *osb = NULL;
1209         char nodestr[8];
1210
1211         mlog_entry("(0x%p)\n", sb);
1212
1213         BUG_ON(!sb);
1214         osb = OCFS2_SB(sb);
1215         BUG_ON(!osb);
1216
1217         ocfs2_shutdown_local_alloc(osb);
1218
1219         ocfs2_truncate_log_shutdown(osb);
1220
1221         /* disable any new recovery threads and wait for any currently
1222          * running ones to exit. Do this before setting the vol_state. */
1223         mutex_lock(&osb->recovery_lock);
1224         osb->disable_recovery = 1;
1225         mutex_unlock(&osb->recovery_lock);
1226         wait_event(osb->recovery_event, !ocfs2_recovery_thread_running(osb));
1227
1228         /* At this point, we know that no more recovery threads can be
1229          * launched, so wait for any recovery completion work to
1230          * complete. */
1231         flush_workqueue(ocfs2_wq);
1232
1233         ocfs2_journal_shutdown(osb);
1234
1235         ocfs2_sync_blockdev(sb);
1236
1237         /* No dlm means we've failed during mount, so skip all the
1238          * steps which depended on that to complete. */
1239         if (osb->dlm) {
1240                 tmp = ocfs2_super_lock(osb, 1);
1241                 if (tmp < 0) {
1242                         mlog_errno(tmp);
1243                         return;
1244                 }
1245
1246                 tmp = ocfs2_request_umount_vote(osb);
1247                 if (tmp < 0)
1248                         mlog_errno(tmp);
1249         }
1250
1251         if (osb->slot_num != OCFS2_INVALID_SLOT)
1252                 ocfs2_put_slot(osb);
1253
1254         if (osb->dlm)
1255                 ocfs2_super_unlock(osb, 1);
1256
1257         ocfs2_release_system_inodes(osb);
1258
1259         if (osb->dlm) {
1260                 ocfs2_unregister_net_handlers(osb);
1261
1262                 ocfs2_dlm_shutdown(osb);
1263         }
1264
1265         ocfs2_clear_hb_callbacks(osb);
1266
1267         debugfs_remove(osb->osb_debug_root);
1268
1269         if (!mnt_err)
1270                 ocfs2_stop_heartbeat(osb);
1271
1272         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1273
1274         if (ocfs2_mount_local(osb))
1275                 snprintf(nodestr, sizeof(nodestr), "local");
1276         else
1277                 snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);
1278
1279         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1280                osb->dev_str, nodestr);
1281
1282         ocfs2_delete_osb(osb);
1283         kfree(osb);
1284         sb->s_dev = 0;
1285         sb->s_fs_info = NULL;
1286 }
1287
1288 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1289                                 unsigned uuid_bytes)
1290 {
1291         int i, ret;
1292         char *ptr;
1293
1294         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1295
1296         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1297         if (osb->uuid_str == NULL)
1298                 return -ENOMEM;
1299
1300         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1301                 /* print with null */
1302                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1303                 if (ret != 2) /* drop super cleans up */
1304                         return -EINVAL;
1305                 /* then only advance past the last char */
1306                 ptr += 2;
1307         }
1308
1309         return 0;
1310 }
1311
1312 static int ocfs2_initialize_super(struct super_block *sb,
1313                                   struct buffer_head *bh,
1314                                   int sector_size)
1315 {
1316         int status;
1317         int i, cbits, bbits;
1318         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1319         struct inode *inode = NULL;
1320         struct buffer_head *bitmap_bh = NULL;
1321         struct ocfs2_journal *journal;
1322         __le32 uuid_net_key;
1323         struct ocfs2_super *osb;
1324
1325         mlog_entry_void();
1326
1327         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1328         if (!osb) {
1329                 status = -ENOMEM;
1330                 mlog_errno(status);
1331                 goto bail;
1332         }
1333
1334         sb->s_fs_info = osb;
1335         sb->s_op = &ocfs2_sops;
1336         sb->s_export_op = &ocfs2_export_ops;
1337         sb->s_time_gran = 1;
1338         sb->s_flags |= MS_NOATIME;
1339         /* this is needed to support O_LARGEFILE */
1340         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1341         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1342         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1343
1344         osb->sb = sb;
1345         /* Save off for ocfs2_rw_direct */
1346         osb->s_sectsize_bits = blksize_bits(sector_size);
1347         BUG_ON(!osb->s_sectsize_bits);
1348
1349         osb->net_response_ids = 0;
1350         spin_lock_init(&osb->net_response_lock);
1351         INIT_LIST_HEAD(&osb->net_response_list);
1352
1353         INIT_LIST_HEAD(&osb->osb_net_handlers);
1354         init_waitqueue_head(&osb->recovery_event);
1355         spin_lock_init(&osb->vote_task_lock);
1356         init_waitqueue_head(&osb->vote_event);
1357         osb->vote_work_sequence = 0;
1358         osb->vote_wake_sequence = 0;
1359         INIT_LIST_HEAD(&osb->blocked_lock_list);
1360         osb->blocked_lock_count = 0;
1361         INIT_LIST_HEAD(&osb->vote_list);
1362         spin_lock_init(&osb->osb_lock);
1363
1364         atomic_set(&osb->alloc_stats.moves, 0);
1365         atomic_set(&osb->alloc_stats.local_data, 0);
1366         atomic_set(&osb->alloc_stats.bitmap_data, 0);
1367         atomic_set(&osb->alloc_stats.bg_allocs, 0);
1368         atomic_set(&osb->alloc_stats.bg_extends, 0);
1369
1370         ocfs2_init_node_maps(osb);
1371
1372         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1373                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1374
1375         mutex_init(&osb->recovery_lock);
1376
1377         osb->disable_recovery = 0;
1378         osb->recovery_thread_task = NULL;
1379
1380         init_waitqueue_head(&osb->checkpoint_event);
1381         atomic_set(&osb->needs_checkpoint, 0);
1382
1383         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1384
1385         osb->node_num = O2NM_INVALID_NODE_NUM;
1386         osb->slot_num = OCFS2_INVALID_SLOT;
1387
1388         osb->local_alloc_state = OCFS2_LA_UNUSED;
1389         osb->local_alloc_bh = NULL;
1390
1391         ocfs2_setup_hb_callbacks(osb);
1392
1393         init_waitqueue_head(&osb->osb_mount_event);
1394
1395         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
1396         if (!osb->vol_label) {
1397                 mlog(ML_ERROR, "unable to alloc vol label\n");
1398                 status = -ENOMEM;
1399                 goto bail;
1400         }
1401
1402         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
1403         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
1404                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
1405                      osb->max_slots);
1406                 status = -EINVAL;
1407                 goto bail;
1408         }
1409         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
1410
1411         init_waitqueue_head(&osb->osb_wipe_event);
1412         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
1413                                         sizeof(*osb->osb_orphan_wipes),
1414                                         GFP_KERNEL);
1415         if (!osb->osb_orphan_wipes) {
1416                 status = -ENOMEM;
1417                 mlog_errno(status);
1418                 goto bail;
1419         }
1420
1421         osb->s_feature_compat =
1422                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
1423         osb->s_feature_ro_compat =
1424                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
1425         osb->s_feature_incompat =
1426                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
1427
1428         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
1429                 mlog(ML_ERROR, "couldn't mount because of unsupported "
1430                      "optional features (%x).\n", i);
1431                 status = -EINVAL;
1432                 goto bail;
1433         }
1434         if (!(osb->sb->s_flags & MS_RDONLY) &&
1435             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
1436                 mlog(ML_ERROR, "couldn't mount RDWR because of "
1437                      "unsupported optional features (%x).\n", i);
1438                 status = -EINVAL;
1439                 goto bail;
1440         }
1441
1442         get_random_bytes(&osb->s_next_generation, sizeof(u32));
1443
1444         /* FIXME
1445          * This should be done in ocfs2_journal_init(), but unknown
1446          * ordering issues will cause the filesystem to crash.
1447          * If anyone wants to figure out what part of the code
1448          * refers to osb->journal before ocfs2_journal_init() is run,
1449          * be my guest.
1450          */
1451         /* initialize our journal structure */
1452
1453         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
1454         if (!journal) {
1455                 mlog(ML_ERROR, "unable to alloc journal\n");
1456                 status = -ENOMEM;
1457                 goto bail;
1458         }
1459         osb->journal = journal;
1460         journal->j_osb = osb;
1461
1462         atomic_set(&journal->j_num_trans, 0);
1463         init_rwsem(&journal->j_trans_barrier);
1464         init_waitqueue_head(&journal->j_checkpointed);
1465         spin_lock_init(&journal->j_lock);
1466         journal->j_trans_id = (unsigned long) 1;
1467         INIT_LIST_HEAD(&journal->j_la_cleanups);
1468         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
1469         journal->j_state = OCFS2_JOURNAL_FREE;
1470
1471         /* get some pseudo constants for clustersize bits */
1472         osb->s_clustersize_bits =
1473                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1474         osb->s_clustersize = 1 << osb->s_clustersize_bits;
1475         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
1476
1477         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
1478             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
1479                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
1480                      osb->s_clustersize);
1481                 status = -EINVAL;
1482                 goto bail;
1483         }
1484
1485         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
1486             > (u32)~0UL) {
1487                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
1488                      "what jbd can address in 32 bits.\n");
1489                 status = -EINVAL;
1490                 goto bail;
1491         }
1492
1493         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
1494                                  sizeof(di->id2.i_super.s_uuid))) {
1495                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
1496                 status = -ENOMEM;
1497                 goto bail;
1498         }
1499
1500         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
1501         osb->net_key = le32_to_cpu(uuid_net_key);
1502
1503         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
1504         osb->vol_label[63] = '\0';
1505         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
1506         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
1507         osb->first_cluster_group_blkno =
1508                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
1509         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
1510         mlog(0, "vol_label: %s\n", osb->vol_label);
1511         mlog(0, "uuid: %s\n", osb->uuid_str);
1512         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
1513              (unsigned long long)osb->root_blkno,
1514              (unsigned long long)osb->system_dir_blkno);
1515
1516         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
1517         if (!osb->osb_dlm_debug) {
1518                 status = -ENOMEM;
1519                 mlog_errno(status);
1520                 goto bail;
1521         }
1522
1523         atomic_set(&osb->vol_state, VOLUME_INIT);
1524
1525         /* load root, system_dir, and all global system inodes */
1526         status = ocfs2_init_global_system_inodes(osb);
1527         if (status < 0) {
1528                 mlog_errno(status);
1529                 goto bail;
1530         }
1531
1532         /*
1533          * global bitmap
1534          */
1535         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
1536                                             OCFS2_INVALID_SLOT);
1537         if (!inode) {
1538                 status = -EINVAL;
1539                 mlog_errno(status);
1540                 goto bail;
1541         }
1542
1543         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
1544
1545         /* We don't have a cluster lock on the bitmap here because
1546          * we're only interested in static information and the extra
1547          * complexity at mount time isn't worht it. Don't pass the
1548          * inode in to the read function though as we don't want it to
1549          * be put in the cache. */
1550         status = ocfs2_read_block(osb, osb->bitmap_blkno, &bitmap_bh, 0,
1551                                   NULL);
1552         iput(inode);
1553         if (status < 0) {
1554                 mlog_errno(status);
1555                 goto bail;
1556         }
1557
1558         di = (struct ocfs2_dinode *) bitmap_bh->b_data;
1559         osb->bitmap_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
1560         brelse(bitmap_bh);
1561         mlog(0, "cluster bitmap inode: %llu, clusters per group: %u\n",
1562              (unsigned long long)osb->bitmap_blkno, osb->bitmap_cpg);
1563
1564         status = ocfs2_init_slot_info(osb);
1565         if (status < 0) {
1566                 mlog_errno(status);
1567                 goto bail;
1568         }
1569
1570 bail:
1571         mlog_exit(status);
1572         return status;
1573 }
1574
1575 /*
1576  * will return: -EAGAIN if it is ok to keep searching for superblocks
1577  *              -EINVAL if there is a bad superblock
1578  *              0 on success
1579  */
1580 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
1581                                struct buffer_head *bh,
1582                                u32 blksz)
1583 {
1584         int status = -EAGAIN;
1585
1586         mlog_entry_void();
1587
1588         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
1589                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
1590                 status = -EINVAL;
1591                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
1592                         mlog(ML_ERROR, "found superblock with incorrect block "
1593                              "size: found %u, should be %u\n",
1594                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
1595                                blksz);
1596                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
1597                            OCFS2_MAJOR_REV_LEVEL ||
1598                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
1599                            OCFS2_MINOR_REV_LEVEL) {
1600                         mlog(ML_ERROR, "found superblock with bad version: "
1601                              "found %u.%u, should be %u.%u\n",
1602                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
1603                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
1604                              OCFS2_MAJOR_REV_LEVEL,
1605                              OCFS2_MINOR_REV_LEVEL);
1606                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
1607                         mlog(ML_ERROR, "bad block number on superblock: "
1608                              "found %llu, should be %llu\n",
1609                              (unsigned long long)le64_to_cpu(di->i_blkno),
1610                              (unsigned long long)bh->b_blocknr);
1611                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
1612                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
1613                         mlog(ML_ERROR, "bad cluster size found: %u\n",
1614                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
1615                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
1616                         mlog(ML_ERROR, "bad root_blkno: 0\n");
1617                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
1618                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
1619                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
1620                         mlog(ML_ERROR,
1621                              "Superblock slots found greater than file system "
1622                              "maximum: found %u, max %u\n",
1623                              le16_to_cpu(di->id2.i_super.s_max_slots),
1624                              OCFS2_MAX_SLOTS);
1625                 } else {
1626                         /* found it! */
1627                         status = 0;
1628                 }
1629         }
1630
1631         mlog_exit(status);
1632         return status;
1633 }
1634
1635 static int ocfs2_check_volume(struct ocfs2_super *osb)
1636 {
1637         int status;
1638         int dirty;
1639         int local;
1640         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
1641                                                   * recover
1642                                                   * ourselves. */
1643
1644         mlog_entry_void();
1645
1646         /* Init our journal object. */
1647         status = ocfs2_journal_init(osb->journal, &dirty);
1648         if (status < 0) {
1649                 mlog(ML_ERROR, "Could not initialize journal!\n");
1650                 goto finally;
1651         }
1652
1653         /* If the journal was unmounted cleanly then we don't want to
1654          * recover anything. Otherwise, journal_load will do that
1655          * dirty work for us :) */
1656         if (!dirty) {
1657                 status = ocfs2_journal_wipe(osb->journal, 0);
1658                 if (status < 0) {
1659                         mlog_errno(status);
1660                         goto finally;
1661                 }
1662         } else {
1663                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
1664                      "recovering volume.\n");
1665         }
1666
1667         local = ocfs2_mount_local(osb);
1668
1669         /* will play back anything left in the journal. */
1670         ocfs2_journal_load(osb->journal, local);
1671
1672         if (dirty) {
1673                 /* recover my local alloc if we didn't unmount cleanly. */
1674                 status = ocfs2_begin_local_alloc_recovery(osb,
1675                                                           osb->slot_num,
1676                                                           &local_alloc);
1677                 if (status < 0) {
1678                         mlog_errno(status);
1679                         goto finally;
1680                 }
1681                 /* we complete the recovery process after we've marked
1682                  * ourselves as mounted. */
1683         }
1684
1685         mlog(0, "Journal loaded.\n");
1686
1687         status = ocfs2_load_local_alloc(osb);
1688         if (status < 0) {
1689                 mlog_errno(status);
1690                 goto finally;
1691         }
1692
1693         if (dirty) {
1694                 /* Recovery will be completed after we've mounted the
1695                  * rest of the volume. */
1696                 osb->dirty = 1;
1697                 osb->local_alloc_copy = local_alloc;
1698                 local_alloc = NULL;
1699         }
1700
1701         /* go through each journal, trylock it and if you get the
1702          * lock, and it's marked as dirty, set the bit in the recover
1703          * map and launch a recovery thread for it. */
1704         status = ocfs2_mark_dead_nodes(osb);
1705         if (status < 0)
1706                 mlog_errno(status);
1707
1708 finally:
1709         if (local_alloc)
1710                 kfree(local_alloc);
1711
1712         mlog_exit(status);
1713         return status;
1714 }
1715
1716 /*
1717  * The routine gets called from dismount or close whenever a dismount on
1718  * volume is requested and the osb open count becomes 1.
1719  * It will remove the osb from the global list and also free up all the
1720  * initialized resources and fileobject.
1721  */
1722 static void ocfs2_delete_osb(struct ocfs2_super *osb)
1723 {
1724         mlog_entry_void();
1725
1726         /* This function assumes that the caller has the main osb resource */
1727
1728         if (osb->slot_info)
1729                 ocfs2_free_slot_info(osb->slot_info);
1730
1731         kfree(osb->osb_orphan_wipes);
1732         /* FIXME
1733          * This belongs in journal shutdown, but because we have to
1734          * allocate osb->journal at the start of ocfs2_initalize_osb(),
1735          * we free it here.
1736          */
1737         kfree(osb->journal);
1738         if (osb->local_alloc_copy)
1739                 kfree(osb->local_alloc_copy);
1740         kfree(osb->uuid_str);
1741         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
1742         memset(osb, 0, sizeof(struct ocfs2_super));
1743
1744         mlog_exit_void();
1745 }
1746
1747 /* Put OCFS2 into a readonly state, or (if the user specifies it),
1748  * panic(). We do not support continue-on-error operation. */
1749 static void ocfs2_handle_error(struct super_block *sb)
1750 {
1751         struct ocfs2_super *osb = OCFS2_SB(sb);
1752
1753         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
1754                 panic("OCFS2: (device %s): panic forced after error\n",
1755                       sb->s_id);
1756
1757         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
1758
1759         if (sb->s_flags & MS_RDONLY &&
1760             (ocfs2_is_soft_readonly(osb) ||
1761              ocfs2_is_hard_readonly(osb)))
1762                 return;
1763
1764         printk(KERN_CRIT "File system is now read-only due to the potential "
1765                "of on-disk corruption. Please run fsck.ocfs2 once the file "
1766                "system is unmounted.\n");
1767         sb->s_flags |= MS_RDONLY;
1768         ocfs2_set_ro_flag(osb, 0);
1769 }
1770
1771 static char error_buf[1024];
1772
1773 void __ocfs2_error(struct super_block *sb,
1774                    const char *function,
1775                    const char *fmt, ...)
1776 {
1777         va_list args;
1778
1779         va_start(args, fmt);
1780         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1781         va_end(args);
1782
1783         /* Not using mlog here because we want to show the actual
1784          * function the error came from. */
1785         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
1786                sb->s_id, function, error_buf);
1787
1788         ocfs2_handle_error(sb);
1789 }
1790
1791 /* Handle critical errors. This is intentionally more drastic than
1792  * ocfs2_handle_error, so we only use for things like journal errors,
1793  * etc. */
1794 void __ocfs2_abort(struct super_block* sb,
1795                    const char *function,
1796                    const char *fmt, ...)
1797 {
1798         va_list args;
1799
1800         va_start(args, fmt);
1801         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1802         va_end(args);
1803
1804         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
1805                sb->s_id, function, error_buf);
1806
1807         /* We don't have the cluster support yet to go straight to
1808          * hard readonly in here. Until then, we want to keep
1809          * ocfs2_abort() so that we can at least mark critical
1810          * errors.
1811          *
1812          * TODO: This should abort the journal and alert other nodes
1813          * that our slot needs recovery. */
1814
1815         /* Force a panic(). This stinks, but it's better than letting
1816          * things continue without having a proper hard readonly
1817          * here. */
1818         OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1819         ocfs2_handle_error(sb);
1820 }
1821
1822 module_init(ocfs2_init);
1823 module_exit(ocfs2_exit);