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 #include <linux/seq_file.h>
  44
  45 #define MLOG_MASK_PREFIX ML_SUPER
  46 #include <cluster/masklog.h>
  47
  48 #include "ocfs2.h"
  49
  50 /* this should be the only file to include a version 1 header */
  51 #include "ocfs1_fs_compat.h"
  52
  53 #include "alloc.h"
  54 #include "dlmglue.h"
  55 #include "export.h"
  56 #include "extent_map.h"
  57 #include "heartbeat.h"
  58 #include "inode.h"
  59 #include "journal.h"
  60 #include "localalloc.h"
  61 #include "namei.h"
  62 #include "slot_map.h"
  63 #include "super.h"
  64 #include "sysfile.h"
  65 #include "uptodate.h"
  66 #include "ver.h"
  67
  68 #include "buffer_head_io.h"
  69
  70 static struct kmem_cache *ocfs2_inode_cachep = NULL;
  71
  72 /* OCFS2 needs to schedule several differnt types of work which
  73  * require cluster locking, disk I/O, recovery waits, etc. Since these
  74  * types of work tend to be heavy we avoid using the kernel events
  75  * workqueue and schedule on our own. */
  76 struct workqueue_struct *ocfs2_wq = NULL;
  77
  78 static struct dentry *ocfs2_debugfs_root = NULL;
  79
  80 MODULE_AUTHOR("Oracle");
  81 MODULE_LICENSE("GPL");
  82
  83 struct mount_options
  84 {
  85         unsigned long   commit_interval;
  86         unsigned long   mount_opt;
  87         unsigned int    atime_quantum;
  88         signed short    slot;
  89         unsigned int    localalloc_opt;
  90         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
  91 };
  92
  93 static int ocfs2_parse_options(struct super_block *sb, char *options,
  94                                struct mount_options *mopt,
  95                                int is_remount);
  96 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
  97 static void ocfs2_put_super(struct super_block *sb);
  98 static int ocfs2_mount_volume(struct super_block *sb);
  99 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 100 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 101 static int ocfs2_initialize_mem_caches(void);
 102 static void ocfs2_free_mem_caches(void);
 103 static void ocfs2_delete_osb(struct ocfs2_super *osb);
 104
 105 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 106
 107 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 108
 109 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 110 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 111 static void ocfs2_release_system_inodes(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_commit,
 154         Opt_localalloc,
 155         Opt_localflocks,
 156         Opt_stack,
 157         Opt_err,
 158 };
 159
 160 static match_table_t tokens = {
 161         {Opt_barrier, "barrier=%u"},
 162         {Opt_err_panic, "errors=panic"},
 163         {Opt_err_ro, "errors=remount-ro"},
 164         {Opt_intr, "intr"},
 165         {Opt_nointr, "nointr"},
 166         {Opt_hb_none, OCFS2_HB_NONE},
 167         {Opt_hb_local, OCFS2_HB_LOCAL},
 168         {Opt_data_ordered, "data=ordered"},
 169         {Opt_data_writeback, "data=writeback"},
 170         {Opt_atime_quantum, "atime_quantum=%u"},
 171         {Opt_slot, "preferred_slot=%u"},
 172         {Opt_commit, "commit=%u"},
 173         {Opt_localalloc, "localalloc=%d"},
 174         {Opt_localflocks, "localflocks"},
 175         {Opt_stack, "cluster_stack=%s"},
 176         {Opt_err, NULL}
 177 };
 178
 179 /*
 180  * write_super and sync_fs ripped right out of ext3.
 181  */
 182 static void ocfs2_write_super(struct super_block *sb)
 183 {
 184         if (mutex_trylock(&sb->s_lock) != 0)
 185                 BUG();
 186         sb->s_dirt = 0;
 187 }
 188
 189 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 190 {
 191         int status;
 192         tid_t target;
 193         struct ocfs2_super *osb = OCFS2_SB(sb);
 194
 195         sb->s_dirt = 0;
 196
 197         if (ocfs2_is_hard_readonly(osb))
 198                 return -EROFS;
 199
 200         if (wait) {
 201                 status = ocfs2_flush_truncate_log(osb);
 202                 if (status < 0)
 203                         mlog_errno(status);
 204         } else {
 205                 ocfs2_schedule_truncate_log_flush(osb, 0);
 206         }
 207
 208         if (journal_start_commit(OCFS2_SB(sb)->journal->j_journal, &target)) {
 209                 if (wait)
 210                         log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 211                                         target);
 212         }
 213         return 0;
 214 }
 215
 216 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 217 {
 218         struct inode *new = NULL;
 219         int status = 0;
 220         int i;
 221
 222         mlog_entry_void();
 223
 224         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 225         if (IS_ERR(new)) {
 226                 status = PTR_ERR(new);
 227                 mlog_errno(status);
 228                 goto bail;
 229         }
 230         osb->root_inode = new;
 231
 232         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 233         if (IS_ERR(new)) {
 234                 status = PTR_ERR(new);
 235                 mlog_errno(status);
 236                 goto bail;
 237         }
 238         osb->sys_root_inode = new;
 239
 240         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 241              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 242                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 243                 if (!new) {
 244                         ocfs2_release_system_inodes(osb);
 245                         status = -EINVAL;
 246                         mlog_errno(status);
 247                         /* FIXME: Should ERROR_RO_FS */
 248                         mlog(ML_ERROR, "Unable to load system inode %d, "
 249                              "possibly corrupt fs?", i);
 250                         goto bail;
 251                 }
 252                 // the array now has one ref, so drop this one
 253                 iput(new);
 254         }
 255
 256 bail:
 257         mlog_exit(status);
 258         return status;
 259 }
 260
 261 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 262 {
 263         struct inode *new = NULL;
 264         int status = 0;
 265         int i;
 266
 267         mlog_entry_void();
 268
 269         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 270              i < NUM_SYSTEM_INODES;
 271              i++) {
 272                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 273                 if (!new) {
 274                         ocfs2_release_system_inodes(osb);
 275                         status = -EINVAL;
 276                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 277                              status, i, osb->slot_num);
 278                         goto bail;
 279                 }
 280                 /* the array now has one ref, so drop this one */
 281                 iput(new);
 282         }
 283
 284 bail:
 285         mlog_exit(status);
 286         return status;
 287 }
 288
 289 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 290 {
 291         int i;
 292         struct inode *inode;
 293
 294         mlog_entry_void();
 295
 296         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 297                 inode = osb->system_inodes[i];
 298                 if (inode) {
 299                         iput(inode);
 300                         osb->system_inodes[i] = NULL;
 301                 }
 302         }
 303
 304         inode = osb->sys_root_inode;
 305         if (inode) {
 306                 iput(inode);
 307                 osb->sys_root_inode = NULL;
 308         }
 309
 310         inode = osb->root_inode;
 311         if (inode) {
 312                 iput(inode);
 313                 osb->root_inode = NULL;
 314         }
 315
 316         mlog_exit(0);
 317 }
 318
 319 /* We're allocating fs objects, use GFP_NOFS */
 320 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 321 {
 322         struct ocfs2_inode_info *oi;
 323
 324         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 325         if (!oi)
 326                 return NULL;
 327
 328         return &oi->vfs_inode;
 329 }
 330
 331 static void ocfs2_destroy_inode(struct inode *inode)
 332 {
 333         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 334 }
 335
 336 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 337                                                 unsigned int cbits)
 338 {
 339         unsigned int bytes = 1 << cbits;
 340         unsigned int trim = bytes;
 341         unsigned int bitshift = 32;
 342
 343         /*
 344          * i_size and all block offsets in ocfs2 are always 64 bits
 345          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 346          * 64 bit platforms, cluster size will be the limiting factor.
 347          */
 348
 349 #if BITS_PER_LONG == 32
 350 # if defined(CONFIG_LBD)
 351         BUILD_BUG_ON(sizeof(sector_t) != 8);
 352         /*
 353          * We might be limited by page cache size.
 354          */
 355         if (bytes > PAGE_CACHE_SIZE) {
 356                 bytes = PAGE_CACHE_SIZE;
 357                 trim = 1;
 358                 /*
 359                  * Shift by 31 here so that we don't get larger than
 360                  * MAX_LFS_FILESIZE
 361                  */
 362                 bitshift = 31;
 363         }
 364 # else
 365         /*
 366          * We are limited by the size of sector_t. Use block size, as
 367          * that's what we expose to the VFS.
 368          */
 369         bytes = 1 << bbits;
 370         trim = 1;
 371         bitshift = 31;
 372 # endif
 373 #endif
 374
 375         /*
 376          * Trim by a whole cluster when we can actually approach the
 377          * on-disk limits. Otherwise we can overflow i_clusters when
 378          * an extent start is at the max offset.
 379          */
 380         return (((unsigned long long)bytes) << bitshift) - trim;
 381 }
 382
 383 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 384 {
 385         int incompat_features;
 386         int ret = 0;
 387         struct mount_options parsed_options;
 388         struct ocfs2_super *osb = OCFS2_SB(sb);
 389
 390         if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
 391                 ret = -EINVAL;
 392                 goto out;
 393         }
 394
 395         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 396             (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 397                 ret = -EINVAL;
 398                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 399                 goto out;
 400         }
 401
 402         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 403             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 404                 ret = -EINVAL;
 405                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 406                 goto out;
 407         }
 408
 409         /* We're going to/from readonly mode. */
 410         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 411                 /* Lock here so the check of HARD_RO and the potential
 412                  * setting of SOFT_RO is atomic. */
 413                 spin_lock(&osb->osb_lock);
 414                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 415                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 416                         ret = -EROFS;
 417                         goto unlock_osb;
 418                 }
 419
 420                 if (*flags & MS_RDONLY) {
 421                         mlog(0, "Going to ro mode.\n");
 422                         sb->s_flags |= MS_RDONLY;
 423                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 424                 } else {
 425                         mlog(0, "Making ro filesystem writeable.\n");
 426
 427                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 428                                 mlog(ML_ERROR, "Cannot remount RDWR "
 429                                      "filesystem due to previous errors.\n");
 430                                 ret = -EROFS;
 431                                 goto unlock_osb;
 432                         }
 433                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 434                         if (incompat_features) {
 435                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 436                                      "of unsupported optional features "
 437                                      "(%x).\n", incompat_features);
 438                                 ret = -EINVAL;
 439                                 goto unlock_osb;
 440                         }
 441                         sb->s_flags &= ~MS_RDONLY;
 442                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 443                 }
 444 unlock_osb:
 445                 spin_unlock(&osb->osb_lock);
 446         }
 447
 448         if (!ret) {
 449                 /* Only save off the new mount options in case of a successful
 450                  * remount. */
 451                 osb->s_mount_opt = parsed_options.mount_opt;
 452                 osb->s_atime_quantum = parsed_options.atime_quantum;
 453                 osb->preferred_slot = parsed_options.slot;
 454                 if (parsed_options.commit_interval)
 455                         osb->osb_commit_interval = parsed_options.commit_interval;
 456
 457                 if (!ocfs2_is_hard_readonly(osb))
 458                         ocfs2_set_journal_params(osb);
 459         }
 460 out:
 461         return ret;
 462 }
 463
 464 static int ocfs2_sb_probe(struct super_block *sb,
 465                           struct buffer_head **bh,
 466                           int *sector_size)
 467 {
 468         int status, tmpstat;
 469         struct ocfs1_vol_disk_hdr *hdr;
 470         struct ocfs2_dinode *di;
 471         int blksize;
 472
 473         *bh = NULL;
 474
 475         /* may be > 512 */
 476         *sector_size = bdev_hardsect_size(sb->s_bdev);
 477         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 478                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 479                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 480                 status = -EINVAL;
 481                 goto bail;
 482         }
 483
 484         /* Can this really happen? */
 485         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 486                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 487
 488         /* check block zero for old format */
 489         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 490         if (status < 0) {
 491                 mlog_errno(status);
 492                 goto bail;
 493         }
 494         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 495         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 496                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 497                      hdr->major_version, hdr->minor_version);
 498                 status = -EINVAL;
 499         }
 500         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 501                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 502                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 503                      hdr->signature);
 504                 status = -EINVAL;
 505         }
 506         brelse(*bh);
 507         *bh = NULL;
 508         if (status < 0) {
 509                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 510                      "upgraded before mounting with ocfs v2\n");
 511                 goto bail;
 512         }
 513
 514         /*
 515          * Now check at magic offset for 512, 1024, 2048, 4096
 516          * blocksizes.  4096 is the maximum blocksize because it is
 517          * the minimum clustersize.
 518          */
 519         status = -EINVAL;
 520         for (blksize = *sector_size;
 521              blksize <= OCFS2_MAX_BLOCKSIZE;
 522              blksize <<= 1) {
 523                 tmpstat = ocfs2_get_sector(sb, bh,
 524                                            OCFS2_SUPER_BLOCK_BLKNO,
 525                                            blksize);
 526                 if (tmpstat < 0) {
 527                         status = tmpstat;
 528                         mlog_errno(status);
 529                         goto bail;
 530                 }
 531                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 532                 status = ocfs2_verify_volume(di, *bh, blksize);
 533                 if (status >= 0)
 534                         goto bail;
 535                 brelse(*bh);
 536                 *bh = NULL;
 537                 if (status != -EAGAIN)
 538                         break;
 539         }
 540
 541 bail:
 542         return status;
 543 }
 544
 545 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 546 {
 547         if (ocfs2_mount_local(osb)) {
 548                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 549                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 550                              "mounted device.\n");
 551                         return -EINVAL;
 552                 }
 553         }
 554
 555         if (ocfs2_userspace_stack(osb)) {
 556                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 557                         mlog(ML_ERROR, "Userspace stack expected, but "
 558                              "o2cb heartbeat arguments passed to mount\n");
 559                         return -EINVAL;
 560                 }
 561         }
 562
 563         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 564                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 565                     !ocfs2_userspace_stack(osb)) {
 566                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 567                              "a read-write clustered device.\n");
 568                         return -EINVAL;
 569                 }
 570         }
 571
 572         return 0;
 573 }
 574
 575 /*
 576  * If we're using a userspace stack, mount should have passed
 577  * a name that matches the disk.  If not, mount should not
 578  * have passed a stack.
 579  */
 580 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 581                                         struct mount_options *mopt)
 582 {
 583         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 584                 mlog(ML_ERROR,
 585                      "cluster stack passed to mount, but this filesystem "
 586                      "does not support it\n");
 587                 return -EINVAL;
 588         }
 589
 590         if (ocfs2_userspace_stack(osb) &&
 591             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 592                     OCFS2_STACK_LABEL_LEN)) {
 593                 mlog(ML_ERROR,
 594                      "cluster stack passed to mount (\"%s\") does not "
 595                      "match the filesystem (\"%s\")\n",
 596                      mopt->cluster_stack,
 597                      osb->osb_cluster_stack);
 598                 return -EINVAL;
 599         }
 600
 601         return 0;
 602 }
 603
 604 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 605 {
 606         struct dentry *root;
 607         int status, sector_size;
 608         struct mount_options parsed_options;
 609         struct inode *inode = NULL;
 610         struct ocfs2_super *osb = NULL;
 611         struct buffer_head *bh = NULL;
 612         char nodestr[8];
 613
 614         mlog_entry("%p, %p, %i", sb, data, silent);
 615
 616         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
 617                 status = -EINVAL;
 618                 goto read_super_error;
 619         }
 620
 621         /* probe for superblock */
 622         status = ocfs2_sb_probe(sb, &bh, &sector_size);
 623         if (status < 0) {
 624                 mlog(ML_ERROR, "superblock probe failed!\n");
 625                 goto read_super_error;
 626         }
 627
 628         status = ocfs2_initialize_super(sb, bh, sector_size);
 629         osb = OCFS2_SB(sb);
 630         if (status < 0) {
 631                 mlog_errno(status);
 632                 goto read_super_error;
 633         }
 634         brelse(bh);
 635         bh = NULL;
 636         osb->s_mount_opt = parsed_options.mount_opt;
 637         osb->s_atime_quantum = parsed_options.atime_quantum;
 638         osb->preferred_slot = parsed_options.slot;
 639         osb->osb_commit_interval = parsed_options.commit_interval;
 640         osb->local_alloc_size = parsed_options.localalloc_opt;
 641
 642         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
 643         if (status)
 644                 goto read_super_error;
 645
 646         sb->s_magic = OCFS2_SUPER_MAGIC;
 647
 648         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
 649          * heartbeat=none */
 650         if (bdev_read_only(sb->s_bdev)) {
 651                 if (!(sb->s_flags & MS_RDONLY)) {
 652                         status = -EACCES;
 653                         mlog(ML_ERROR, "Readonly device detected but readonly "
 654                              "mount was not specified.\n");
 655                         goto read_super_error;
 656                 }
 657
 658                 /* You should not be able to start a local heartbeat
 659                  * on a readonly device. */
 660                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 661                         status = -EROFS;
 662                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
 663                              "device.\n");
 664                         goto read_super_error;
 665                 }
 666
 667                 status = ocfs2_check_journals_nolocks(osb);
 668                 if (status < 0) {
 669                         if (status == -EROFS)
 670                                 mlog(ML_ERROR, "Recovery required on readonly "
 671                                      "file system, but write access is "
 672                                      "unavailable.\n");
 673                         else
 674                                 mlog_errno(status);
 675                         goto read_super_error;
 676                 }
 677
 678                 ocfs2_set_ro_flag(osb, 1);
 679
 680                 printk(KERN_NOTICE "Readonly device detected. No cluster "
 681                        "services will be utilized for this mount. Recovery "
 682                        "will be skipped.\n");
 683         }
 684
 685         if (!ocfs2_is_hard_readonly(osb)) {
 686                 if (sb->s_flags & MS_RDONLY)
 687                         ocfs2_set_ro_flag(osb, 0);
 688         }
 689
 690         status = ocfs2_verify_heartbeat(osb);
 691         if (status < 0) {
 692                 mlog_errno(status);
 693                 goto read_super_error;
 694         }
 695
 696         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
 697                                                  ocfs2_debugfs_root);
 698         if (!osb->osb_debug_root) {
 699                 status = -EINVAL;
 700                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
 701                 goto read_super_error;
 702         }
 703
 704         status = ocfs2_mount_volume(sb);
 705         if (osb->root_inode)
 706                 inode = igrab(osb->root_inode);
 707
 708         if (status < 0)
 709                 goto read_super_error;
 710
 711         if (!inode) {
 712                 status = -EIO;
 713                 mlog_errno(status);
 714                 goto read_super_error;
 715         }
 716
 717         root = d_alloc_root(inode);
 718         if (!root) {
 719                 status = -ENOMEM;
 720                 mlog_errno(status);
 721                 goto read_super_error;
 722         }
 723
 724         sb->s_root = root;
 725
 726         ocfs2_complete_mount_recovery(osb);
 727
 728         if (ocfs2_mount_local(osb))
 729                 snprintf(nodestr, sizeof(nodestr), "local");
 730         else
 731                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
 732
 733         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
 734                "with %s data mode.\n",
 735                osb->dev_str, nodestr, osb->slot_num,
 736                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
 737                "ordered");
 738
 739         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
 740         wake_up(&osb->osb_mount_event);
 741
 742         mlog_exit(status);
 743         return status;
 744
 745 read_super_error:
 746         if (bh != NULL)
 747                 brelse(bh);
 748
 749         if (inode)
 750                 iput(inode);
 751
 752         if (osb) {
 753                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
 754                 wake_up(&osb->osb_mount_event);
 755                 ocfs2_dismount_volume(sb, 1);
 756         }
 757
 758         mlog_exit(status);
 759         return status;
 760 }
 761
 762 static int ocfs2_get_sb(struct file_system_type *fs_type,
 763                         int flags,
 764                         const char *dev_name,
 765                         void *data,
 766                         struct vfsmount *mnt)
 767 {
 768         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
 769                            mnt);
 770 }
 771
 772 static struct file_system_type ocfs2_fs_type = {
 773         .owner          = THIS_MODULE,
 774         .name           = "ocfs2",
 775         .get_sb         = ocfs2_get_sb, /* is this called when we mount
 776                                         * the fs? */
 777         .kill_sb        = kill_block_super, /* set to the generic one
 778                                              * right now, but do we
 779                                              * need to change that? */
 780         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
 781         .next           = NULL
 782 };
 783
 784 static int ocfs2_parse_options(struct super_block *sb,
 785                                char *options,
 786                                struct mount_options *mopt,
 787                                int is_remount)
 788 {
 789         int status;
 790         char *p;
 791
 792         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
 793                    options ? options : "(none)");
 794
 795         mopt->commit_interval = 0;
 796         mopt->mount_opt = 0;
 797         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
 798         mopt->slot = OCFS2_INVALID_SLOT;
 799         mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
 800         mopt->cluster_stack[0] = '\0';
 801
 802         if (!options) {
 803                 status = 1;
 804                 goto bail;
 805         }
 806
 807         while ((p = strsep(&options, ",")) != NULL) {
 808                 int token, option;
 809                 substring_t args[MAX_OPT_ARGS];
 810
 811                 if (!*p)
 812                         continue;
 813
 814                 token = match_token(p, tokens, args);
 815                 switch (token) {
 816                 case Opt_hb_local:
 817                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
 818                         break;
 819                 case Opt_hb_none:
 820                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
 821                         break;
 822                 case Opt_barrier:
 823                         if (match_int(&args[0], &option)) {
 824                                 status = 0;
 825                                 goto bail;
 826                         }
 827                         if (option)
 828                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
 829                         else
 830                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
 831                         break;
 832                 case Opt_intr:
 833                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
 834                         break;
 835                 case Opt_nointr:
 836                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
 837                         break;
 838                 case Opt_err_panic:
 839                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
 840                         break;
 841                 case Opt_err_ro:
 842                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
 843                         break;
 844                 case Opt_data_ordered:
 845                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
 846                         break;
 847                 case Opt_data_writeback:
 848                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
 849                         break;
 850                 case Opt_atime_quantum:
 851                         if (match_int(&args[0], &option)) {
 852                                 status = 0;
 853                                 goto bail;
 854                         }
 855                         if (option >= 0)
 856                                 mopt->atime_quantum = option;
 857                         break;
 858                 case Opt_slot:
 859                         option = 0;
 860                         if (match_int(&args[0], &option)) {
 861                                 status = 0;
 862                                 goto bail;
 863                         }
 864                         if (option)
 865                                 mopt->slot = (s16)option;
 866                         break;
 867                 case Opt_commit:
 868                         option = 0;
 869                         if (match_int(&args[0], &option)) {
 870                                 status = 0;
 871                                 goto bail;
 872                         }
 873                         if (option < 0)
 874                                 return 0;
 875                         if (option == 0)
 876                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
 877                         mopt->commit_interval = HZ * option;
 878                         break;
 879                 case Opt_localalloc:
 880                         option = 0;
 881                         if (match_int(&args[0], &option)) {
 882                                 status = 0;
 883                                 goto bail;
 884                         }
 885                         if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
 886                                 mopt->localalloc_opt = option;
 887                         break;
 888                 case Opt_localflocks:
 889                         /*
 890                          * Changing this during remount could race
 891                          * flock() requests, or "unbalance" existing
 892                          * ones (e.g., a lock is taken in one mode but
 893                          * dropped in the other). If users care enough
 894                          * to flip locking modes during remount, we
 895                          * could add a "local" flag to individual
 896                          * flock structures for proper tracking of
 897                          * state.
 898                          */
 899                         if (!is_remount)
 900                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
 901                         break;
 902                 case Opt_stack:
 903                         /* Check both that the option we were passed
 904                          * is of the right length and that it is a proper
 905                          * string of the right length.
 906                          */
 907                         if (((args[0].to - args[0].from) !=
 908                              OCFS2_STACK_LABEL_LEN) ||
 909                             (strnlen(args[0].from,
 910                                      OCFS2_STACK_LABEL_LEN) !=
 911                              OCFS2_STACK_LABEL_LEN)) {
 912                                 mlog(ML_ERROR,
 913                                      "Invalid cluster_stack option\n");
 914                                 status = 0;
 915                                 goto bail;
 916                         }
 917                         memcpy(mopt->cluster_stack, args[0].from,
 918                                OCFS2_STACK_LABEL_LEN);
 919                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
 920                         break;
 921                 default:
 922                         mlog(ML_ERROR,
 923                              "Unrecognized mount option \"%s\" "
 924                              "or missing value\n", p);
 925                         status = 0;
 926                         goto bail;
 927                 }
 928         }
 929
 930         status = 1;
 931
 932 bail:
 933         mlog_exit(status);
 934         return status;
 935 }
 936
 937 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
 938 {
 939         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
 940         unsigned long opts = osb->s_mount_opt;
 941
 942         if (opts & OCFS2_MOUNT_HB_LOCAL)
 943                 seq_printf(s, ",_netdev,heartbeat=local");
 944         else
 945                 seq_printf(s, ",heartbeat=none");
 946
 947         if (opts & OCFS2_MOUNT_NOINTR)
 948                 seq_printf(s, ",nointr");
 949
 950         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
 951                 seq_printf(s, ",data=writeback");
 952         else
 953                 seq_printf(s, ",data=ordered");
 954
 955         if (opts & OCFS2_MOUNT_BARRIER)
 956                 seq_printf(s, ",barrier=1");
 957
 958         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
 959                 seq_printf(s, ",errors=panic");
 960         else
 961                 seq_printf(s, ",errors=remount-ro");
 962
 963         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
 964                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
 965
 966         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
 967                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
 968
 969         if (osb->osb_commit_interval)
 970                 seq_printf(s, ",commit=%u",
 971                            (unsigned) (osb->osb_commit_interval / HZ));
 972
 973         if (osb->local_alloc_size != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
 974                 seq_printf(s, ",localalloc=%d", osb->local_alloc_size);
 975
 976         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
 977                 seq_printf(s, ",localflocks,");
 978
 979         if (osb->osb_cluster_stack[0])
 980                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
 981                            osb->osb_cluster_stack);
 982
 983         return 0;
 984 }
 985
 986 static int __init ocfs2_init(void)
 987 {
 988         int status;
 989
 990         mlog_entry_void();
 991
 992         ocfs2_print_version();
 993
 994         status = init_ocfs2_uptodate_cache();
 995         if (status < 0) {
 996                 mlog_errno(status);
 997                 goto leave;
 998         }
 999
1000         status = ocfs2_initialize_mem_caches();
1001         if (status < 0) {
1002                 mlog_errno(status);
1003                 goto leave;
1004         }
1005
1006         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1007         if (!ocfs2_wq) {
1008                 status = -ENOMEM;
1009                 goto leave;
1010         }
1011
1012         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1013         if (!ocfs2_debugfs_root) {
1014                 status = -EFAULT;
1015                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1016         }
1017
1018         ocfs2_set_locking_protocol();
1019
1020 leave:
1021         if (status < 0) {
1022                 ocfs2_free_mem_caches();
1023                 exit_ocfs2_uptodate_cache();
1024         }
1025
1026         mlog_exit(status);
1027
1028         if (status >= 0) {
1029                 return register_filesystem(&ocfs2_fs_type);
1030         } else
1031                 return -1;
1032 }
1033
1034 static void __exit ocfs2_exit(void)
1035 {
1036         mlog_entry_void();
1037
1038         if (ocfs2_wq) {
1039                 flush_workqueue(ocfs2_wq);
1040                 destroy_workqueue(ocfs2_wq);
1041         }
1042
1043         debugfs_remove(ocfs2_debugfs_root);
1044
1045         ocfs2_free_mem_caches();
1046
1047         unregister_filesystem(&ocfs2_fs_type);
1048
1049         exit_ocfs2_uptodate_cache();
1050
1051         mlog_exit_void();
1052 }
1053
1054 static void ocfs2_put_super(struct super_block *sb)
1055 {
1056         mlog_entry("(0x%p)\n", sb);
1057
1058         ocfs2_sync_blockdev(sb);
1059         ocfs2_dismount_volume(sb, 0);
1060
1061         mlog_exit_void();
1062 }
1063
1064 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1065 {
1066         struct ocfs2_super *osb;
1067         u32 numbits, freebits;
1068         int status;
1069         struct ocfs2_dinode *bm_lock;
1070         struct buffer_head *bh = NULL;
1071         struct inode *inode = NULL;
1072
1073         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1074
1075         osb = OCFS2_SB(dentry->d_sb);
1076
1077         inode = ocfs2_get_system_file_inode(osb,
1078                                             GLOBAL_BITMAP_SYSTEM_INODE,
1079                                             OCFS2_INVALID_SLOT);
1080         if (!inode) {
1081                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1082                 status = -EIO;
1083                 goto bail;
1084         }
1085
1086         status = ocfs2_inode_lock(inode, &bh, 0);
1087         if (status < 0) {
1088                 mlog_errno(status);
1089                 goto bail;
1090         }
1091
1092         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1093
1094         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1095         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1096
1097         buf->f_type = OCFS2_SUPER_MAGIC;
1098         buf->f_bsize = dentry->d_sb->s_blocksize;
1099         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1100         buf->f_blocks = ((sector_t) numbits) *
1101                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1102         buf->f_bfree = ((sector_t) freebits) *
1103                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1104         buf->f_bavail = buf->f_bfree;
1105         buf->f_files = numbits;
1106         buf->f_ffree = freebits;
1107
1108         brelse(bh);
1109
1110         ocfs2_inode_unlock(inode, 0);
1111         status = 0;
1112 bail:
1113         if (inode)
1114                 iput(inode);
1115
1116         mlog_exit(status);
1117
1118         return status;
1119 }
1120
1121 static void ocfs2_inode_init_once(void *data)
1122 {
1123         struct ocfs2_inode_info *oi = data;
1124
1125         oi->ip_flags = 0;
1126         oi->ip_open_count = 0;
1127         spin_lock_init(&oi->ip_lock);
1128         ocfs2_extent_map_init(&oi->vfs_inode);
1129         INIT_LIST_HEAD(&oi->ip_io_markers);
1130         oi->ip_created_trans = 0;
1131         oi->ip_last_trans = 0;
1132         oi->ip_dir_start_lookup = 0;
1133
1134         init_rwsem(&oi->ip_alloc_sem);
1135         mutex_init(&oi->ip_io_mutex);
1136
1137         oi->ip_blkno = 0ULL;
1138         oi->ip_clusters = 0;
1139
1140         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1141         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1142         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1143
1144         ocfs2_metadata_cache_init(&oi->vfs_inode);
1145
1146         inode_init_once(&oi->vfs_inode);
1147 }
1148
1149 static int ocfs2_initialize_mem_caches(void)
1150 {
1151         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1152                                        sizeof(struct ocfs2_inode_info),
1153                                        0,
1154                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1155                                                 SLAB_MEM_SPREAD),
1156                                        ocfs2_inode_init_once);
1157         if (!ocfs2_inode_cachep)
1158                 return -ENOMEM;
1159
1160         return 0;
1161 }
1162
1163 static void ocfs2_free_mem_caches(void)
1164 {
1165         if (ocfs2_inode_cachep)
1166                 kmem_cache_destroy(ocfs2_inode_cachep);
1167
1168         ocfs2_inode_cachep = NULL;
1169 }
1170
1171 static int ocfs2_get_sector(struct super_block *sb,
1172                             struct buffer_head **bh,
1173                             int block,
1174                             int sect_size)
1175 {
1176         if (!sb_set_blocksize(sb, sect_size)) {
1177                 mlog(ML_ERROR, "unable to set blocksize\n");
1178                 return -EIO;
1179         }
1180
1181         *bh = sb_getblk(sb, block);
1182         if (!*bh) {
1183                 mlog_errno(-EIO);
1184                 return -EIO;
1185         }
1186         lock_buffer(*bh);
1187         if (!buffer_dirty(*bh))
1188                 clear_buffer_uptodate(*bh);
1189         unlock_buffer(*bh);
1190         ll_rw_block(READ, 1, bh);
1191         wait_on_buffer(*bh);
1192         return 0;
1193 }
1194
1195 static int ocfs2_mount_volume(struct super_block *sb)
1196 {
1197         int status = 0;
1198         int unlock_super = 0;
1199         struct ocfs2_super *osb = OCFS2_SB(sb);
1200
1201         mlog_entry_void();
1202
1203         if (ocfs2_is_hard_readonly(osb))
1204                 goto leave;
1205
1206         status = ocfs2_dlm_init(osb);
1207         if (status < 0) {
1208                 mlog_errno(status);
1209                 goto leave;
1210         }
1211
1212         status = ocfs2_super_lock(osb, 1);
1213         if (status < 0) {
1214                 mlog_errno(status);
1215                 goto leave;
1216         }
1217         unlock_super = 1;
1218
1219         /* This will load up the node map and add ourselves to it. */
1220         status = ocfs2_find_slot(osb);
1221         if (status < 0) {
1222                 mlog_errno(status);
1223                 goto leave;
1224         }
1225
1226         /* load all node-local system inodes */
1227         status = ocfs2_init_local_system_inodes(osb);
1228         if (status < 0) {
1229                 mlog_errno(status);
1230                 goto leave;
1231         }
1232
1233         status = ocfs2_check_volume(osb);
1234         if (status < 0) {
1235                 mlog_errno(status);
1236                 goto leave;
1237         }
1238
1239         status = ocfs2_truncate_log_init(osb);
1240         if (status < 0) {
1241                 mlog_errno(status);
1242                 goto leave;
1243         }
1244
1245         if (ocfs2_mount_local(osb))
1246                 goto leave;
1247
1248 leave:
1249         if (unlock_super)
1250                 ocfs2_super_unlock(osb, 1);
1251
1252         mlog_exit(status);
1253         return status;
1254 }
1255
1256 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1257 {
1258         int tmp, hangup_needed = 0;
1259         struct ocfs2_super *osb = NULL;
1260         char nodestr[8];
1261
1262         mlog_entry("(0x%p)\n", sb);
1263
1264         BUG_ON(!sb);
1265         osb = OCFS2_SB(sb);
1266         BUG_ON(!osb);
1267
1268         ocfs2_shutdown_local_alloc(osb);
1269
1270         ocfs2_truncate_log_shutdown(osb);
1271
1272         /* This will disable recovery and flush any recovery work. */
1273         ocfs2_recovery_exit(osb);
1274
1275         ocfs2_journal_shutdown(osb);
1276
1277         ocfs2_sync_blockdev(sb);
1278
1279         /* No cluster connection means we've failed during mount, so skip
1280          * all the steps which depended on that to complete. */
1281         if (osb->cconn) {
1282                 tmp = ocfs2_super_lock(osb, 1);
1283                 if (tmp < 0) {
1284                         mlog_errno(tmp);
1285                         return;
1286                 }
1287         }
1288
1289         if (osb->slot_num != OCFS2_INVALID_SLOT)
1290                 ocfs2_put_slot(osb);
1291
1292         if (osb->cconn)
1293                 ocfs2_super_unlock(osb, 1);
1294
1295         ocfs2_release_system_inodes(osb);
1296
1297         /*
1298          * If we're dismounting due to mount error, mount.ocfs2 will clean
1299          * up heartbeat.  If we're a local mount, there is no heartbeat.
1300          * If we failed before we got a uuid_str yet, we can't stop
1301          * heartbeat.  Otherwise, do it.
1302          */
1303         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1304                 hangup_needed = 1;
1305
1306         if (osb->cconn)
1307                 ocfs2_dlm_shutdown(osb, hangup_needed);
1308
1309         debugfs_remove(osb->osb_debug_root);
1310
1311         if (hangup_needed)
1312                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1313
1314         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1315
1316         if (ocfs2_mount_local(osb))
1317                 snprintf(nodestr, sizeof(nodestr), "local");
1318         else
1319                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1320
1321         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1322                osb->dev_str, nodestr);
1323
1324         ocfs2_delete_osb(osb);
1325         kfree(osb);
1326         sb->s_dev = 0;
1327         sb->s_fs_info = NULL;
1328 }
1329
1330 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1331                                 unsigned uuid_bytes)
1332 {
1333         int i, ret;
1334         char *ptr;
1335
1336         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1337
1338         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1339         if (osb->uuid_str == NULL)
1340                 return -ENOMEM;
1341
1342         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1343                 /* print with null */
1344                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1345                 if (ret != 2) /* drop super cleans up */
1346                         return -EINVAL;
1347                 /* then only advance past the last char */
1348                 ptr += 2;
1349         }
1350
1351         return 0;
1352 }
1353
1354 static int ocfs2_initialize_super(struct super_block *sb,
1355                                   struct buffer_head *bh,
1356                                   int sector_size)
1357 {
1358         int status;
1359         int i, cbits, bbits;
1360         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1361         struct inode *inode = NULL;
1362         struct ocfs2_journal *journal;
1363         __le32 uuid_net_key;
1364         struct ocfs2_super *osb;
1365
1366         mlog_entry_void();
1367
1368         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1369         if (!osb) {
1370                 status = -ENOMEM;
1371                 mlog_errno(status);
1372                 goto bail;
1373         }
1374
1375         sb->s_fs_info = osb;
1376         sb->s_op = &ocfs2_sops;
1377         sb->s_export_op = &ocfs2_export_ops;
1378         sb->s_time_gran = 1;
1379         sb->s_flags |= MS_NOATIME;
1380         /* this is needed to support O_LARGEFILE */
1381         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1382         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1383         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1384
1385         osb->sb = sb;
1386         /* Save off for ocfs2_rw_direct */
1387         osb->s_sectsize_bits = blksize_bits(sector_size);
1388         BUG_ON(!osb->s_sectsize_bits);
1389
1390         spin_lock_init(&osb->dc_task_lock);
1391         init_waitqueue_head(&osb->dc_event);
1392         osb->dc_work_sequence = 0;
1393         osb->dc_wake_sequence = 0;
1394         INIT_LIST_HEAD(&osb->blocked_lock_list);
1395         osb->blocked_lock_count = 0;
1396         spin_lock_init(&osb->osb_lock);
1397         ocfs2_init_inode_steal_slot(osb);
1398
1399         atomic_set(&osb->alloc_stats.moves, 0);
1400         atomic_set(&osb->alloc_stats.local_data, 0);
1401         atomic_set(&osb->alloc_stats.bitmap_data, 0);
1402         atomic_set(&osb->alloc_stats.bg_allocs, 0);
1403         atomic_set(&osb->alloc_stats.bg_extends, 0);
1404
1405         ocfs2_init_node_maps(osb);
1406
1407         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1408                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1409
1410         status = ocfs2_recovery_init(osb);
1411         if (status) {
1412                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
1413                 mlog_errno(status);
1414                 goto bail;
1415         }
1416
1417         init_waitqueue_head(&osb->checkpoint_event);
1418         atomic_set(&osb->needs_checkpoint, 0);
1419
1420         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1421
1422         osb->slot_num = OCFS2_INVALID_SLOT;
1423
1424         osb->local_alloc_state = OCFS2_LA_UNUSED;
1425         osb->local_alloc_bh = NULL;
1426
1427         init_waitqueue_head(&osb->osb_mount_event);
1428
1429         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
1430         if (!osb->vol_label) {
1431                 mlog(ML_ERROR, "unable to alloc vol label\n");
1432                 status = -ENOMEM;
1433                 goto bail;
1434         }
1435
1436         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
1437         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
1438                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
1439                      osb->max_slots);
1440                 status = -EINVAL;
1441                 goto bail;
1442         }
1443         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
1444
1445         init_waitqueue_head(&osb->osb_wipe_event);
1446         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
1447                                         sizeof(*osb->osb_orphan_wipes),
1448                                         GFP_KERNEL);
1449         if (!osb->osb_orphan_wipes) {
1450                 status = -ENOMEM;
1451                 mlog_errno(status);
1452                 goto bail;
1453         }
1454
1455         osb->s_feature_compat =
1456                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
1457         osb->s_feature_ro_compat =
1458                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
1459         osb->s_feature_incompat =
1460                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
1461
1462         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
1463                 mlog(ML_ERROR, "couldn't mount because of unsupported "
1464                      "optional features (%x).\n", i);
1465                 status = -EINVAL;
1466                 goto bail;
1467         }
1468         if (!(osb->sb->s_flags & MS_RDONLY) &&
1469             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
1470                 mlog(ML_ERROR, "couldn't mount RDWR because of "
1471                      "unsupported optional features (%x).\n", i);
1472                 status = -EINVAL;
1473                 goto bail;
1474         }
1475
1476         if (ocfs2_userspace_stack(osb)) {
1477                 memcpy(osb->osb_cluster_stack,
1478                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
1479                        OCFS2_STACK_LABEL_LEN);
1480                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1481                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
1482                         mlog(ML_ERROR,
1483                              "couldn't mount because of an invalid "
1484                              "cluster stack label (%s) \n",
1485                              osb->osb_cluster_stack);
1486                         status = -EINVAL;
1487                         goto bail;
1488                 }
1489         } else {
1490                 /* The empty string is identical with classic tools that
1491                  * don't know about s_cluster_info. */
1492                 osb->osb_cluster_stack[0] = '\0';
1493         }
1494
1495         get_random_bytes(&osb->s_next_generation, sizeof(u32));
1496
1497         /* FIXME
1498          * This should be done in ocfs2_journal_init(), but unknown
1499          * ordering issues will cause the filesystem to crash.
1500          * If anyone wants to figure out what part of the code
1501          * refers to osb->journal before ocfs2_journal_init() is run,
1502          * be my guest.
1503          */
1504         /* initialize our journal structure */
1505
1506         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
1507         if (!journal) {
1508                 mlog(ML_ERROR, "unable to alloc journal\n");
1509                 status = -ENOMEM;
1510                 goto bail;
1511         }
1512         osb->journal = journal;
1513         journal->j_osb = osb;
1514
1515         atomic_set(&journal->j_num_trans, 0);
1516         init_rwsem(&journal->j_trans_barrier);
1517         init_waitqueue_head(&journal->j_checkpointed);
1518         spin_lock_init(&journal->j_lock);
1519         journal->j_trans_id = (unsigned long) 1;
1520         INIT_LIST_HEAD(&journal->j_la_cleanups);
1521         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
1522         journal->j_state = OCFS2_JOURNAL_FREE;
1523
1524         /* get some pseudo constants for clustersize bits */
1525         osb->s_clustersize_bits =
1526                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1527         osb->s_clustersize = 1 << osb->s_clustersize_bits;
1528         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
1529
1530         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
1531             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
1532                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
1533                      osb->s_clustersize);
1534                 status = -EINVAL;
1535                 goto bail;
1536         }
1537
1538         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
1539             > (u32)~0UL) {
1540                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
1541                      "what jbd can address in 32 bits.\n");
1542                 status = -EINVAL;
1543                 goto bail;
1544         }
1545
1546         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
1547                                  sizeof(di->id2.i_super.s_uuid))) {
1548                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
1549                 status = -ENOMEM;
1550                 goto bail;
1551         }
1552
1553         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
1554
1555         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
1556         osb->vol_label[63] = '\0';
1557         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
1558         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
1559         osb->first_cluster_group_blkno =
1560                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
1561         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
1562         mlog(0, "vol_label: %s\n", osb->vol_label);
1563         mlog(0, "uuid: %s\n", osb->uuid_str);
1564         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
1565              (unsigned long long)osb->root_blkno,
1566              (unsigned long long)osb->system_dir_blkno);
1567
1568         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
1569         if (!osb->osb_dlm_debug) {
1570                 status = -ENOMEM;
1571                 mlog_errno(status);
1572                 goto bail;
1573         }
1574
1575         atomic_set(&osb->vol_state, VOLUME_INIT);
1576
1577         /* load root, system_dir, and all global system inodes */
1578         status = ocfs2_init_global_system_inodes(osb);
1579         if (status < 0) {
1580                 mlog_errno(status);
1581                 goto bail;
1582         }
1583
1584         /*
1585          * global bitmap
1586          */
1587         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
1588                                             OCFS2_INVALID_SLOT);
1589         if (!inode) {
1590                 status = -EINVAL;
1591                 mlog_errno(status);
1592                 goto bail;
1593         }
1594
1595         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
1596         iput(inode);
1597
1598         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
1599
1600         status = ocfs2_init_slot_info(osb);
1601         if (status < 0) {
1602                 mlog_errno(status);
1603                 goto bail;
1604         }
1605
1606 bail:
1607         mlog_exit(status);
1608         return status;
1609 }
1610
1611 /*
1612  * will return: -EAGAIN if it is ok to keep searching for superblocks
1613  *              -EINVAL if there is a bad superblock
1614  *              0 on success
1615  */
1616 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
1617                                struct buffer_head *bh,
1618                                u32 blksz)
1619 {
1620         int status = -EAGAIN;
1621
1622         mlog_entry_void();
1623
1624         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
1625                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
1626                 status = -EINVAL;
1627                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
1628                         mlog(ML_ERROR, "found superblock with incorrect block "
1629                              "size: found %u, should be %u\n",
1630                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
1631                                blksz);
1632                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
1633                            OCFS2_MAJOR_REV_LEVEL ||
1634                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
1635                            OCFS2_MINOR_REV_LEVEL) {
1636                         mlog(ML_ERROR, "found superblock with bad version: "
1637                              "found %u.%u, should be %u.%u\n",
1638                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
1639                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
1640                              OCFS2_MAJOR_REV_LEVEL,
1641                              OCFS2_MINOR_REV_LEVEL);
1642                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
1643                         mlog(ML_ERROR, "bad block number on superblock: "
1644                              "found %llu, should be %llu\n",
1645                              (unsigned long long)le64_to_cpu(di->i_blkno),
1646                              (unsigned long long)bh->b_blocknr);
1647                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
1648                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
1649                         mlog(ML_ERROR, "bad cluster size found: %u\n",
1650                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
1651                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
1652                         mlog(ML_ERROR, "bad root_blkno: 0\n");
1653                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
1654                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
1655                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
1656                         mlog(ML_ERROR,
1657                              "Superblock slots found greater than file system "
1658                              "maximum: found %u, max %u\n",
1659                              le16_to_cpu(di->id2.i_super.s_max_slots),
1660                              OCFS2_MAX_SLOTS);
1661                 } else {
1662                         /* found it! */
1663                         status = 0;
1664                 }
1665         }
1666
1667         mlog_exit(status);
1668         return status;
1669 }
1670
1671 static int ocfs2_check_volume(struct ocfs2_super *osb)
1672 {
1673         int status;
1674         int dirty;
1675         int local;
1676         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
1677                                                   * recover
1678                                                   * ourselves. */
1679
1680         mlog_entry_void();
1681
1682         /* Init our journal object. */
1683         status = ocfs2_journal_init(osb->journal, &dirty);
1684         if (status < 0) {
1685                 mlog(ML_ERROR, "Could not initialize journal!\n");
1686                 goto finally;
1687         }
1688
1689         /* If the journal was unmounted cleanly then we don't want to
1690          * recover anything. Otherwise, journal_load will do that
1691          * dirty work for us :) */
1692         if (!dirty) {
1693                 status = ocfs2_journal_wipe(osb->journal, 0);
1694                 if (status < 0) {
1695                         mlog_errno(status);
1696                         goto finally;
1697                 }
1698         } else {
1699                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
1700                      "recovering volume.\n");
1701         }
1702
1703         local = ocfs2_mount_local(osb);
1704
1705         /* will play back anything left in the journal. */
1706         status = ocfs2_journal_load(osb->journal, local);
1707         if (status < 0) {
1708                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
1709                 goto finally;
1710         }
1711
1712         if (dirty) {
1713                 /* recover my local alloc if we didn't unmount cleanly. */
1714                 status = ocfs2_begin_local_alloc_recovery(osb,
1715                                                           osb->slot_num,
1716                                                           &local_alloc);
1717                 if (status < 0) {
1718                         mlog_errno(status);
1719                         goto finally;
1720                 }
1721                 /* we complete the recovery process after we've marked
1722                  * ourselves as mounted. */
1723         }
1724
1725         mlog(0, "Journal loaded.\n");
1726
1727         status = ocfs2_load_local_alloc(osb);
1728         if (status < 0) {
1729                 mlog_errno(status);
1730                 goto finally;
1731         }
1732
1733         if (dirty) {
1734                 /* Recovery will be completed after we've mounted the
1735                  * rest of the volume. */
1736                 osb->dirty = 1;
1737                 osb->local_alloc_copy = local_alloc;
1738                 local_alloc = NULL;
1739         }
1740
1741         /* go through each journal, trylock it and if you get the
1742          * lock, and it's marked as dirty, set the bit in the recover
1743          * map and launch a recovery thread for it. */
1744         status = ocfs2_mark_dead_nodes(osb);
1745         if (status < 0)
1746                 mlog_errno(status);
1747
1748 finally:
1749         if (local_alloc)
1750                 kfree(local_alloc);
1751
1752         mlog_exit(status);
1753         return status;
1754 }
1755
1756 /*
1757  * The routine gets called from dismount or close whenever a dismount on
1758  * volume is requested and the osb open count becomes 1.
1759  * It will remove the osb from the global list and also free up all the
1760  * initialized resources and fileobject.
1761  */
1762 static void ocfs2_delete_osb(struct ocfs2_super *osb)
1763 {
1764         mlog_entry_void();
1765
1766         /* This function assumes that the caller has the main osb resource */
1767
1768         ocfs2_free_slot_info(osb);
1769
1770         kfree(osb->osb_orphan_wipes);
1771         /* FIXME
1772          * This belongs in journal shutdown, but because we have to
1773          * allocate osb->journal at the start of ocfs2_initalize_osb(),
1774          * we free it here.
1775          */
1776         kfree(osb->journal);
1777         if (osb->local_alloc_copy)
1778                 kfree(osb->local_alloc_copy);
1779         kfree(osb->uuid_str);
1780         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
1781         memset(osb, 0, sizeof(struct ocfs2_super));
1782
1783         mlog_exit_void();
1784 }
1785
1786 /* Put OCFS2 into a readonly state, or (if the user specifies it),
1787  * panic(). We do not support continue-on-error operation. */
1788 static void ocfs2_handle_error(struct super_block *sb)
1789 {
1790         struct ocfs2_super *osb = OCFS2_SB(sb);
1791
1792         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
1793                 panic("OCFS2: (device %s): panic forced after error\n",
1794                       sb->s_id);
1795
1796         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
1797
1798         if (sb->s_flags & MS_RDONLY &&
1799             (ocfs2_is_soft_readonly(osb) ||
1800              ocfs2_is_hard_readonly(osb)))
1801                 return;
1802
1803         printk(KERN_CRIT "File system is now read-only due to the potential "
1804                "of on-disk corruption. Please run fsck.ocfs2 once the file "
1805                "system is unmounted.\n");
1806         sb->s_flags |= MS_RDONLY;
1807         ocfs2_set_ro_flag(osb, 0);
1808 }
1809
1810 static char error_buf[1024];
1811
1812 void __ocfs2_error(struct super_block *sb,
1813                    const char *function,
1814                    const char *fmt, ...)
1815 {
1816         va_list args;
1817
1818         va_start(args, fmt);
1819         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1820         va_end(args);
1821
1822         /* Not using mlog here because we want to show the actual
1823          * function the error came from. */
1824         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
1825                sb->s_id, function, error_buf);
1826
1827         ocfs2_handle_error(sb);
1828 }
1829
1830 /* Handle critical errors. This is intentionally more drastic than
1831  * ocfs2_handle_error, so we only use for things like journal errors,
1832  * etc. */
1833 void __ocfs2_abort(struct super_block* sb,
1834                    const char *function,
1835                    const char *fmt, ...)
1836 {
1837         va_list args;
1838
1839         va_start(args, fmt);
1840         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1841         va_end(args);
1842
1843         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
1844                sb->s_id, function, error_buf);
1845
1846         /* We don't have the cluster support yet to go straight to
1847          * hard readonly in here. Until then, we want to keep
1848          * ocfs2_abort() so that we can at least mark critical
1849          * errors.
1850          *
1851          * TODO: This should abort the journal and alert other nodes
1852          * that our slot needs recovery. */
1853
1854         /* Force a panic(). This stinks, but it's better than letting
1855          * things continue without having a proper hard readonly
1856          * here. */
1857         OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1858         ocfs2_handle_error(sb);
1859 }
1860
1861 module_init(ocfs2_init);
1862 module_exit(ocfs2_exit);