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 #include "xattr.h"
  68
  69 #include "buffer_head_io.h"
  70
  71 static struct kmem_cache *ocfs2_inode_cachep = NULL;
  72
  73 /* OCFS2 needs to schedule several differnt types of work which
  74  * require cluster locking, disk I/O, recovery waits, etc. Since these
  75  * types of work tend to be heavy we avoid using the kernel events
  76  * workqueue and schedule on our own. */
  77 struct workqueue_struct *ocfs2_wq = NULL;
  78
  79 static struct dentry *ocfs2_debugfs_root = NULL;
  80
  81 MODULE_AUTHOR("Oracle");
  82 MODULE_LICENSE("GPL");
  83
  84 struct mount_options
  85 {
  86         unsigned long   commit_interval;
  87         unsigned long   mount_opt;
  88         unsigned int    atime_quantum;
  89         signed short    slot;
  90         unsigned int    localalloc_opt;
  91         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
  92 };
  93
  94 static int ocfs2_parse_options(struct super_block *sb, char *options,
  95                                struct mount_options *mopt,
  96                                int is_remount);
  97 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
  98 static void ocfs2_put_super(struct super_block *sb);
  99 static int ocfs2_mount_volume(struct super_block *sb);
 100 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 101 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 102 static int ocfs2_initialize_mem_caches(void);
 103 static void ocfs2_free_mem_caches(void);
 104 static void ocfs2_delete_osb(struct ocfs2_super *osb);
 105
 106 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 107
 108 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 109
 110 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 111 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 112 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 113 static int ocfs2_check_volume(struct ocfs2_super *osb);
 114 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 115                                struct buffer_head *bh,
 116                                u32 sectsize);
 117 static int ocfs2_initialize_super(struct super_block *sb,
 118                                   struct buffer_head *bh,
 119                                   int sector_size);
 120 static int ocfs2_get_sector(struct super_block *sb,
 121                             struct buffer_head **bh,
 122                             int block,
 123                             int sect_size);
 124 static void ocfs2_write_super(struct super_block *sb);
 125 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 126 static void ocfs2_destroy_inode(struct inode *inode);
 127
 128 static const struct super_operations ocfs2_sops = {
 129         .statfs         = ocfs2_statfs,
 130         .alloc_inode    = ocfs2_alloc_inode,
 131         .destroy_inode  = ocfs2_destroy_inode,
 132         .drop_inode     = ocfs2_drop_inode,
 133         .clear_inode    = ocfs2_clear_inode,
 134         .delete_inode   = ocfs2_delete_inode,
 135         .sync_fs        = ocfs2_sync_fs,
 136         .write_super    = ocfs2_write_super,
 137         .put_super      = ocfs2_put_super,
 138         .remount_fs     = ocfs2_remount,
 139         .show_options   = ocfs2_show_options,
 140 };
 141
 142 enum {
 143         Opt_barrier,
 144         Opt_err_panic,
 145         Opt_err_ro,
 146         Opt_intr,
 147         Opt_nointr,
 148         Opt_hb_none,
 149         Opt_hb_local,
 150         Opt_data_ordered,
 151         Opt_data_writeback,
 152         Opt_atime_quantum,
 153         Opt_slot,
 154         Opt_commit,
 155         Opt_localalloc,
 156         Opt_localflocks,
 157         Opt_stack,
 158         Opt_user_xattr,
 159         Opt_nouser_xattr,
 160         Opt_inode64,
 161         Opt_acl,
 162         Opt_noacl,
 163         Opt_err,
 164 };
 165
 166 static const match_table_t tokens = {
 167         {Opt_barrier, "barrier=%u"},
 168         {Opt_err_panic, "errors=panic"},
 169         {Opt_err_ro, "errors=remount-ro"},
 170         {Opt_intr, "intr"},
 171         {Opt_nointr, "nointr"},
 172         {Opt_hb_none, OCFS2_HB_NONE},
 173         {Opt_hb_local, OCFS2_HB_LOCAL},
 174         {Opt_data_ordered, "data=ordered"},
 175         {Opt_data_writeback, "data=writeback"},
 176         {Opt_atime_quantum, "atime_quantum=%u"},
 177         {Opt_slot, "preferred_slot=%u"},
 178         {Opt_commit, "commit=%u"},
 179         {Opt_localalloc, "localalloc=%d"},
 180         {Opt_localflocks, "localflocks"},
 181         {Opt_stack, "cluster_stack=%s"},
 182         {Opt_user_xattr, "user_xattr"},
 183         {Opt_nouser_xattr, "nouser_xattr"},
 184         {Opt_inode64, "inode64"},
 185         {Opt_acl, "acl"},
 186         {Opt_noacl, "noacl"},
 187         {Opt_err, NULL}
 188 };
 189
 190 /*
 191  * write_super and sync_fs ripped right out of ext3.
 192  */
 193 static void ocfs2_write_super(struct super_block *sb)
 194 {
 195         if (mutex_trylock(&sb->s_lock) != 0)
 196                 BUG();
 197         sb->s_dirt = 0;
 198 }
 199
 200 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 201 {
 202         int status;
 203         tid_t target;
 204         struct ocfs2_super *osb = OCFS2_SB(sb);
 205
 206         sb->s_dirt = 0;
 207
 208         if (ocfs2_is_hard_readonly(osb))
 209                 return -EROFS;
 210
 211         if (wait) {
 212                 status = ocfs2_flush_truncate_log(osb);
 213                 if (status < 0)
 214                         mlog_errno(status);
 215         } else {
 216                 ocfs2_schedule_truncate_log_flush(osb, 0);
 217         }
 218
 219         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
 220                                       &target)) {
 221                 if (wait)
 222                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 223                                              target);
 224         }
 225         return 0;
 226 }
 227
 228 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 229 {
 230         struct inode *new = NULL;
 231         int status = 0;
 232         int i;
 233
 234         mlog_entry_void();
 235
 236         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 237         if (IS_ERR(new)) {
 238                 status = PTR_ERR(new);
 239                 mlog_errno(status);
 240                 goto bail;
 241         }
 242         osb->root_inode = new;
 243
 244         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 245         if (IS_ERR(new)) {
 246                 status = PTR_ERR(new);
 247                 mlog_errno(status);
 248                 goto bail;
 249         }
 250         osb->sys_root_inode = new;
 251
 252         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 253              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 254                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 255                 if (!new) {
 256                         ocfs2_release_system_inodes(osb);
 257                         status = -EINVAL;
 258                         mlog_errno(status);
 259                         /* FIXME: Should ERROR_RO_FS */
 260                         mlog(ML_ERROR, "Unable to load system inode %d, "
 261                              "possibly corrupt fs?", i);
 262                         goto bail;
 263                 }
 264                 // the array now has one ref, so drop this one
 265                 iput(new);
 266         }
 267
 268 bail:
 269         mlog_exit(status);
 270         return status;
 271 }
 272
 273 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 274 {
 275         struct inode *new = NULL;
 276         int status = 0;
 277         int i;
 278
 279         mlog_entry_void();
 280
 281         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 282              i < NUM_SYSTEM_INODES;
 283              i++) {
 284                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 285                 if (!new) {
 286                         ocfs2_release_system_inodes(osb);
 287                         status = -EINVAL;
 288                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 289                              status, i, osb->slot_num);
 290                         goto bail;
 291                 }
 292                 /* the array now has one ref, so drop this one */
 293                 iput(new);
 294         }
 295
 296 bail:
 297         mlog_exit(status);
 298         return status;
 299 }
 300
 301 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 302 {
 303         int i;
 304         struct inode *inode;
 305
 306         mlog_entry_void();
 307
 308         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 309                 inode = osb->system_inodes[i];
 310                 if (inode) {
 311                         iput(inode);
 312                         osb->system_inodes[i] = NULL;
 313                 }
 314         }
 315
 316         inode = osb->sys_root_inode;
 317         if (inode) {
 318                 iput(inode);
 319                 osb->sys_root_inode = NULL;
 320         }
 321
 322         inode = osb->root_inode;
 323         if (inode) {
 324                 iput(inode);
 325                 osb->root_inode = NULL;
 326         }
 327
 328         mlog_exit(0);
 329 }
 330
 331 /* We're allocating fs objects, use GFP_NOFS */
 332 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 333 {
 334         struct ocfs2_inode_info *oi;
 335
 336         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 337         if (!oi)
 338                 return NULL;
 339
 340         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
 341         return &oi->vfs_inode;
 342 }
 343
 344 static void ocfs2_destroy_inode(struct inode *inode)
 345 {
 346         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 347 }
 348
 349 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 350                                                 unsigned int cbits)
 351 {
 352         unsigned int bytes = 1 << cbits;
 353         unsigned int trim = bytes;
 354         unsigned int bitshift = 32;
 355
 356         /*
 357          * i_size and all block offsets in ocfs2 are always 64 bits
 358          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 359          * 64 bit platforms, cluster size will be the limiting factor.
 360          */
 361
 362 #if BITS_PER_LONG == 32
 363 # if defined(CONFIG_LBD)
 364         BUILD_BUG_ON(sizeof(sector_t) != 8);
 365         /*
 366          * We might be limited by page cache size.
 367          */
 368         if (bytes > PAGE_CACHE_SIZE) {
 369                 bytes = PAGE_CACHE_SIZE;
 370                 trim = 1;
 371                 /*
 372                  * Shift by 31 here so that we don't get larger than
 373                  * MAX_LFS_FILESIZE
 374                  */
 375                 bitshift = 31;
 376         }
 377 # else
 378         /*
 379          * We are limited by the size of sector_t. Use block size, as
 380          * that's what we expose to the VFS.
 381          */
 382         bytes = 1 << bbits;
 383         trim = 1;
 384         bitshift = 31;
 385 # endif
 386 #endif
 387
 388         /*
 389          * Trim by a whole cluster when we can actually approach the
 390          * on-disk limits. Otherwise we can overflow i_clusters when
 391          * an extent start is at the max offset.
 392          */
 393         return (((unsigned long long)bytes) << bitshift) - trim;
 394 }
 395
 396 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 397 {
 398         int incompat_features;
 399         int ret = 0;
 400         struct mount_options parsed_options;
 401         struct ocfs2_super *osb = OCFS2_SB(sb);
 402
 403         if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
 404                 ret = -EINVAL;
 405                 goto out;
 406         }
 407
 408         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 409             (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 410                 ret = -EINVAL;
 411                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 412                 goto out;
 413         }
 414
 415         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 416             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 417                 ret = -EINVAL;
 418                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 419                 goto out;
 420         }
 421
 422         /* Probably don't want this on remount; it might
 423          * mess with other nodes */
 424         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 425             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 426                 ret = -EINVAL;
 427                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 428                 goto out;
 429         }
 430
 431         /* We're going to/from readonly mode. */
 432         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 433                 /* Lock here so the check of HARD_RO and the potential
 434                  * setting of SOFT_RO is atomic. */
 435                 spin_lock(&osb->osb_lock);
 436                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 437                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 438                         ret = -EROFS;
 439                         goto unlock_osb;
 440                 }
 441
 442                 if (*flags & MS_RDONLY) {
 443                         mlog(0, "Going to ro mode.\n");
 444                         sb->s_flags |= MS_RDONLY;
 445                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 446                 } else {
 447                         mlog(0, "Making ro filesystem writeable.\n");
 448
 449                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 450                                 mlog(ML_ERROR, "Cannot remount RDWR "
 451                                      "filesystem due to previous errors.\n");
 452                                 ret = -EROFS;
 453                                 goto unlock_osb;
 454                         }
 455                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 456                         if (incompat_features) {
 457                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 458                                      "of unsupported optional features "
 459                                      "(%x).\n", incompat_features);
 460                                 ret = -EINVAL;
 461                                 goto unlock_osb;
 462                         }
 463                         sb->s_flags &= ~MS_RDONLY;
 464                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 465                 }
 466 unlock_osb:
 467                 spin_unlock(&osb->osb_lock);
 468         }
 469
 470         if (!ret) {
 471                 /* Only save off the new mount options in case of a successful
 472                  * remount. */
 473                 if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
 474                         parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
 475                 osb->s_mount_opt = parsed_options.mount_opt;
 476                 osb->s_atime_quantum = parsed_options.atime_quantum;
 477                 osb->preferred_slot = parsed_options.slot;
 478                 if (parsed_options.commit_interval)
 479                         osb->osb_commit_interval = parsed_options.commit_interval;
 480
 481                 if (!ocfs2_is_hard_readonly(osb))
 482                         ocfs2_set_journal_params(osb);
 483         }
 484 out:
 485         return ret;
 486 }
 487
 488 static int ocfs2_sb_probe(struct super_block *sb,
 489                           struct buffer_head **bh,
 490                           int *sector_size)
 491 {
 492         int status, tmpstat;
 493         struct ocfs1_vol_disk_hdr *hdr;
 494         struct ocfs2_dinode *di;
 495         int blksize;
 496
 497         *bh = NULL;
 498
 499         /* may be > 512 */
 500         *sector_size = bdev_hardsect_size(sb->s_bdev);
 501         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 502                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 503                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 504                 status = -EINVAL;
 505                 goto bail;
 506         }
 507
 508         /* Can this really happen? */
 509         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 510                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 511
 512         /* check block zero for old format */
 513         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 514         if (status < 0) {
 515                 mlog_errno(status);
 516                 goto bail;
 517         }
 518         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 519         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 520                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 521                      hdr->major_version, hdr->minor_version);
 522                 status = -EINVAL;
 523         }
 524         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 525                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 526                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 527                      hdr->signature);
 528                 status = -EINVAL;
 529         }
 530         brelse(*bh);
 531         *bh = NULL;
 532         if (status < 0) {
 533                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 534                      "upgraded before mounting with ocfs v2\n");
 535                 goto bail;
 536         }
 537
 538         /*
 539          * Now check at magic offset for 512, 1024, 2048, 4096
 540          * blocksizes.  4096 is the maximum blocksize because it is
 541          * the minimum clustersize.
 542          */
 543         status = -EINVAL;
 544         for (blksize = *sector_size;
 545              blksize <= OCFS2_MAX_BLOCKSIZE;
 546              blksize <<= 1) {
 547                 tmpstat = ocfs2_get_sector(sb, bh,
 548                                            OCFS2_SUPER_BLOCK_BLKNO,
 549                                            blksize);
 550                 if (tmpstat < 0) {
 551                         status = tmpstat;
 552                         mlog_errno(status);
 553                         goto bail;
 554                 }
 555                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 556                 status = ocfs2_verify_volume(di, *bh, blksize);
 557                 if (status >= 0)
 558                         goto bail;
 559                 brelse(*bh);
 560                 *bh = NULL;
 561                 if (status != -EAGAIN)
 562                         break;
 563         }
 564
 565 bail:
 566         return status;
 567 }
 568
 569 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 570 {
 571         if (ocfs2_mount_local(osb)) {
 572                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 573                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 574                              "mounted device.\n");
 575                         return -EINVAL;
 576                 }
 577         }
 578
 579         if (ocfs2_userspace_stack(osb)) {
 580                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 581                         mlog(ML_ERROR, "Userspace stack expected, but "
 582                              "o2cb heartbeat arguments passed to mount\n");
 583                         return -EINVAL;
 584                 }
 585         }
 586
 587         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 588                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 589                     !ocfs2_userspace_stack(osb)) {
 590                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 591                              "a read-write clustered device.\n");
 592                         return -EINVAL;
 593                 }
 594         }
 595
 596         return 0;
 597 }
 598
 599 /*
 600  * If we're using a userspace stack, mount should have passed
 601  * a name that matches the disk.  If not, mount should not
 602  * have passed a stack.
 603  */
 604 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 605                                         struct mount_options *mopt)
 606 {
 607         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 608                 mlog(ML_ERROR,
 609                      "cluster stack passed to mount, but this filesystem "
 610                      "does not support it\n");
 611                 return -EINVAL;
 612         }
 613
 614         if (ocfs2_userspace_stack(osb) &&
 615             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 616                     OCFS2_STACK_LABEL_LEN)) {
 617                 mlog(ML_ERROR,
 618                      "cluster stack passed to mount (\"%s\") does not "
 619                      "match the filesystem (\"%s\")\n",
 620                      mopt->cluster_stack,
 621                      osb->osb_cluster_stack);
 622                 return -EINVAL;
 623         }
 624
 625         return 0;
 626 }
 627
 628 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 629 {
 630         struct dentry *root;
 631         int status, sector_size;
 632         struct mount_options parsed_options;
 633         struct inode *inode = NULL;
 634         struct ocfs2_super *osb = NULL;
 635         struct buffer_head *bh = NULL;
 636         char nodestr[8];
 637
 638         mlog_entry("%p, %p, %i", sb, data, silent);
 639
 640         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
 641                 status = -EINVAL;
 642                 goto read_super_error;
 643         }
 644
 645         /* probe for superblock */
 646         status = ocfs2_sb_probe(sb, &bh, &sector_size);
 647         if (status < 0) {
 648                 mlog(ML_ERROR, "superblock probe failed!\n");
 649                 goto read_super_error;
 650         }
 651
 652         status = ocfs2_initialize_super(sb, bh, sector_size);
 653         osb = OCFS2_SB(sb);
 654         if (status < 0) {
 655                 mlog_errno(status);
 656                 goto read_super_error;
 657         }
 658         brelse(bh);
 659         bh = NULL;
 660
 661         if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
 662                 parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
 663
 664         osb->s_mount_opt = parsed_options.mount_opt;
 665         osb->s_atime_quantum = parsed_options.atime_quantum;
 666         osb->preferred_slot = parsed_options.slot;
 667         osb->osb_commit_interval = parsed_options.commit_interval;
 668         osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
 669         osb->local_alloc_bits = osb->local_alloc_default_bits;
 670
 671         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
 672         if (status)
 673                 goto read_super_error;
 674
 675         sb->s_magic = OCFS2_SUPER_MAGIC;
 676
 677         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 678                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
 679
 680         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
 681          * heartbeat=none */
 682         if (bdev_read_only(sb->s_bdev)) {
 683                 if (!(sb->s_flags & MS_RDONLY)) {
 684                         status = -EACCES;
 685                         mlog(ML_ERROR, "Readonly device detected but readonly "
 686                              "mount was not specified.\n");
 687                         goto read_super_error;
 688                 }
 689
 690                 /* You should not be able to start a local heartbeat
 691                  * on a readonly device. */
 692                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 693                         status = -EROFS;
 694                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
 695                              "device.\n");
 696                         goto read_super_error;
 697                 }
 698
 699                 status = ocfs2_check_journals_nolocks(osb);
 700                 if (status < 0) {
 701                         if (status == -EROFS)
 702                                 mlog(ML_ERROR, "Recovery required on readonly "
 703                                      "file system, but write access is "
 704                                      "unavailable.\n");
 705                         else
 706                                 mlog_errno(status);
 707                         goto read_super_error;
 708                 }
 709
 710                 ocfs2_set_ro_flag(osb, 1);
 711
 712                 printk(KERN_NOTICE "Readonly device detected. No cluster "
 713                        "services will be utilized for this mount. Recovery "
 714                        "will be skipped.\n");
 715         }
 716
 717         if (!ocfs2_is_hard_readonly(osb)) {
 718                 if (sb->s_flags & MS_RDONLY)
 719                         ocfs2_set_ro_flag(osb, 0);
 720         }
 721
 722         status = ocfs2_verify_heartbeat(osb);
 723         if (status < 0) {
 724                 mlog_errno(status);
 725                 goto read_super_error;
 726         }
 727
 728         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
 729                                                  ocfs2_debugfs_root);
 730         if (!osb->osb_debug_root) {
 731                 status = -EINVAL;
 732                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
 733                 goto read_super_error;
 734         }
 735
 736         status = ocfs2_mount_volume(sb);
 737         if (osb->root_inode)
 738                 inode = igrab(osb->root_inode);
 739
 740         if (status < 0)
 741                 goto read_super_error;
 742
 743         if (!inode) {
 744                 status = -EIO;
 745                 mlog_errno(status);
 746                 goto read_super_error;
 747         }
 748
 749         root = d_alloc_root(inode);
 750         if (!root) {
 751                 status = -ENOMEM;
 752                 mlog_errno(status);
 753                 goto read_super_error;
 754         }
 755
 756         sb->s_root = root;
 757
 758         ocfs2_complete_mount_recovery(osb);
 759
 760         if (ocfs2_mount_local(osb))
 761                 snprintf(nodestr, sizeof(nodestr), "local");
 762         else
 763                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
 764
 765         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
 766                "with %s data mode.\n",
 767                osb->dev_str, nodestr, osb->slot_num,
 768                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
 769                "ordered");
 770
 771         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
 772         wake_up(&osb->osb_mount_event);
 773
 774         mlog_exit(status);
 775         return status;
 776
 777 read_super_error:
 778         brelse(bh);
 779
 780         if (inode)
 781                 iput(inode);
 782
 783         if (osb) {
 784                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
 785                 wake_up(&osb->osb_mount_event);
 786                 ocfs2_dismount_volume(sb, 1);
 787         }
 788
 789         mlog_exit(status);
 790         return status;
 791 }
 792
 793 static int ocfs2_get_sb(struct file_system_type *fs_type,
 794                         int flags,
 795                         const char *dev_name,
 796                         void *data,
 797                         struct vfsmount *mnt)
 798 {
 799         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
 800                            mnt);
 801 }
 802
 803 static struct file_system_type ocfs2_fs_type = {
 804         .owner          = THIS_MODULE,
 805         .name           = "ocfs2",
 806         .get_sb         = ocfs2_get_sb, /* is this called when we mount
 807                                         * the fs? */
 808         .kill_sb        = kill_block_super, /* set to the generic one
 809                                              * right now, but do we
 810                                              * need to change that? */
 811         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
 812         .next           = NULL
 813 };
 814
 815 static int ocfs2_parse_options(struct super_block *sb,
 816                                char *options,
 817                                struct mount_options *mopt,
 818                                int is_remount)
 819 {
 820         int status;
 821         char *p;
 822
 823         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
 824                    options ? options : "(none)");
 825
 826         mopt->commit_interval = 0;
 827         mopt->mount_opt = 0;
 828         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
 829         mopt->slot = OCFS2_INVALID_SLOT;
 830         mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
 831         mopt->cluster_stack[0] = '\0';
 832
 833         if (!options) {
 834                 status = 1;
 835                 goto bail;
 836         }
 837
 838         while ((p = strsep(&options, ",")) != NULL) {
 839                 int token, option;
 840                 substring_t args[MAX_OPT_ARGS];
 841
 842                 if (!*p)
 843                         continue;
 844
 845                 token = match_token(p, tokens, args);
 846                 switch (token) {
 847                 case Opt_hb_local:
 848                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
 849                         break;
 850                 case Opt_hb_none:
 851                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
 852                         break;
 853                 case Opt_barrier:
 854                         if (match_int(&args[0], &option)) {
 855                                 status = 0;
 856                                 goto bail;
 857                         }
 858                         if (option)
 859                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
 860                         else
 861                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
 862                         break;
 863                 case Opt_intr:
 864                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
 865                         break;
 866                 case Opt_nointr:
 867                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
 868                         break;
 869                 case Opt_err_panic:
 870                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
 871                         break;
 872                 case Opt_err_ro:
 873                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
 874                         break;
 875                 case Opt_data_ordered:
 876                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
 877                         break;
 878                 case Opt_data_writeback:
 879                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
 880                         break;
 881                 case Opt_user_xattr:
 882                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
 883                         break;
 884                 case Opt_nouser_xattr:
 885                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
 886                         break;
 887                 case Opt_atime_quantum:
 888                         if (match_int(&args[0], &option)) {
 889                                 status = 0;
 890                                 goto bail;
 891                         }
 892                         if (option >= 0)
 893                                 mopt->atime_quantum = option;
 894                         break;
 895                 case Opt_slot:
 896                         option = 0;
 897                         if (match_int(&args[0], &option)) {
 898                                 status = 0;
 899                                 goto bail;
 900                         }
 901                         if (option)
 902                                 mopt->slot = (s16)option;
 903                         break;
 904                 case Opt_commit:
 905                         option = 0;
 906                         if (match_int(&args[0], &option)) {
 907                                 status = 0;
 908                                 goto bail;
 909                         }
 910                         if (option < 0)
 911                                 return 0;
 912                         if (option == 0)
 913                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
 914                         mopt->commit_interval = HZ * option;
 915                         break;
 916                 case Opt_localalloc:
 917                         option = 0;
 918                         if (match_int(&args[0], &option)) {
 919                                 status = 0;
 920                                 goto bail;
 921                         }
 922                         if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
 923                                 mopt->localalloc_opt = option;
 924                         break;
 925                 case Opt_localflocks:
 926                         /*
 927                          * Changing this during remount could race
 928                          * flock() requests, or "unbalance" existing
 929                          * ones (e.g., a lock is taken in one mode but
 930                          * dropped in the other). If users care enough
 931                          * to flip locking modes during remount, we
 932                          * could add a "local" flag to individual
 933                          * flock structures for proper tracking of
 934                          * state.
 935                          */
 936                         if (!is_remount)
 937                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
 938                         break;
 939                 case Opt_stack:
 940                         /* Check both that the option we were passed
 941                          * is of the right length and that it is a proper
 942                          * string of the right length.
 943                          */
 944                         if (((args[0].to - args[0].from) !=
 945                              OCFS2_STACK_LABEL_LEN) ||
 946                             (strnlen(args[0].from,
 947                                      OCFS2_STACK_LABEL_LEN) !=
 948                              OCFS2_STACK_LABEL_LEN)) {
 949                                 mlog(ML_ERROR,
 950                                      "Invalid cluster_stack option\n");
 951                                 status = 0;
 952                                 goto bail;
 953                         }
 954                         memcpy(mopt->cluster_stack, args[0].from,
 955                                OCFS2_STACK_LABEL_LEN);
 956                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
 957                         break;
 958                 case Opt_inode64:
 959                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
 960                         break;
 961 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
 962                 case Opt_acl:
 963                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
 964                         break;
 965                 case Opt_noacl:
 966                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
 967                         break;
 968 #else
 969                 case Opt_acl:
 970                 case Opt_noacl:
 971                         printk(KERN_INFO "ocfs2 (no)acl options not supported\n");
 972                         break;
 973 #endif
 974                 default:
 975                         mlog(ML_ERROR,
 976                              "Unrecognized mount option \"%s\" "
 977                              "or missing value\n", p);
 978                         status = 0;
 979                         goto bail;
 980                 }
 981         }
 982
 983         status = 1;
 984
 985 bail:
 986         mlog_exit(status);
 987         return status;
 988 }
 989
 990 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
 991 {
 992         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
 993         unsigned long opts = osb->s_mount_opt;
 994         unsigned int local_alloc_megs;
 995
 996         if (opts & OCFS2_MOUNT_HB_LOCAL)
 997                 seq_printf(s, ",_netdev,heartbeat=local");
 998         else
 999                 seq_printf(s, ",heartbeat=none");
1000
1001         if (opts & OCFS2_MOUNT_NOINTR)
1002                 seq_printf(s, ",nointr");
1003
1004         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1005                 seq_printf(s, ",data=writeback");
1006         else
1007                 seq_printf(s, ",data=ordered");
1008
1009         if (opts & OCFS2_MOUNT_BARRIER)
1010                 seq_printf(s, ",barrier=1");
1011
1012         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1013                 seq_printf(s, ",errors=panic");
1014         else
1015                 seq_printf(s, ",errors=remount-ro");
1016
1017         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1018                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1019
1020         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
1021                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1022
1023         if (osb->osb_commit_interval)
1024                 seq_printf(s, ",commit=%u",
1025                            (unsigned) (osb->osb_commit_interval / HZ));
1026
1027         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1028         if (local_alloc_megs != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
1029                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1030
1031         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1032                 seq_printf(s, ",localflocks,");
1033
1034         if (osb->osb_cluster_stack[0])
1035                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1036                            osb->osb_cluster_stack);
1037
1038         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1039                 seq_printf(s, ",nouser_xattr");
1040         else
1041                 seq_printf(s, ",user_xattr");
1042
1043         if (opts & OCFS2_MOUNT_INODE64)
1044                 seq_printf(s, ",inode64");
1045
1046 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1047         if (opts & OCFS2_MOUNT_POSIX_ACL)
1048                 seq_printf(s, ",acl");
1049         else
1050                 seq_printf(s, ",noacl");
1051 #endif
1052
1053         return 0;
1054 }
1055
1056 static int __init ocfs2_init(void)
1057 {
1058         int status;
1059
1060         mlog_entry_void();
1061
1062         ocfs2_print_version();
1063
1064         status = init_ocfs2_uptodate_cache();
1065         if (status < 0) {
1066                 mlog_errno(status);
1067                 goto leave;
1068         }
1069
1070         status = ocfs2_initialize_mem_caches();
1071         if (status < 0) {
1072                 mlog_errno(status);
1073                 goto leave;
1074         }
1075
1076         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1077         if (!ocfs2_wq) {
1078                 status = -ENOMEM;
1079                 goto leave;
1080         }
1081
1082         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1083         if (!ocfs2_debugfs_root) {
1084                 status = -EFAULT;
1085                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1086         }
1087
1088         ocfs2_set_locking_protocol();
1089
1090 leave:
1091         if (status < 0) {
1092                 ocfs2_free_mem_caches();
1093                 exit_ocfs2_uptodate_cache();
1094         }
1095
1096         mlog_exit(status);
1097
1098         if (status >= 0) {
1099                 return register_filesystem(&ocfs2_fs_type);
1100         } else
1101                 return -1;
1102 }
1103
1104 static void __exit ocfs2_exit(void)
1105 {
1106         mlog_entry_void();
1107
1108         if (ocfs2_wq) {
1109                 flush_workqueue(ocfs2_wq);
1110                 destroy_workqueue(ocfs2_wq);
1111         }
1112
1113         debugfs_remove(ocfs2_debugfs_root);
1114
1115         ocfs2_free_mem_caches();
1116
1117         unregister_filesystem(&ocfs2_fs_type);
1118
1119         exit_ocfs2_uptodate_cache();
1120
1121         mlog_exit_void();
1122 }
1123
1124 static void ocfs2_put_super(struct super_block *sb)
1125 {
1126         mlog_entry("(0x%p)\n", sb);
1127
1128         ocfs2_sync_blockdev(sb);
1129         ocfs2_dismount_volume(sb, 0);
1130
1131         mlog_exit_void();
1132 }
1133
1134 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1135 {
1136         struct ocfs2_super *osb;
1137         u32 numbits, freebits;
1138         int status;
1139         struct ocfs2_dinode *bm_lock;
1140         struct buffer_head *bh = NULL;
1141         struct inode *inode = NULL;
1142
1143         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1144
1145         osb = OCFS2_SB(dentry->d_sb);
1146
1147         inode = ocfs2_get_system_file_inode(osb,
1148                                             GLOBAL_BITMAP_SYSTEM_INODE,
1149                                             OCFS2_INVALID_SLOT);
1150         if (!inode) {
1151                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1152                 status = -EIO;
1153                 goto bail;
1154         }
1155
1156         status = ocfs2_inode_lock(inode, &bh, 0);
1157         if (status < 0) {
1158                 mlog_errno(status);
1159                 goto bail;
1160         }
1161
1162         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1163
1164         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1165         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1166
1167         buf->f_type = OCFS2_SUPER_MAGIC;
1168         buf->f_bsize = dentry->d_sb->s_blocksize;
1169         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1170         buf->f_blocks = ((sector_t) numbits) *
1171                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1172         buf->f_bfree = ((sector_t) freebits) *
1173                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1174         buf->f_bavail = buf->f_bfree;
1175         buf->f_files = numbits;
1176         buf->f_ffree = freebits;
1177
1178         brelse(bh);
1179
1180         ocfs2_inode_unlock(inode, 0);
1181         status = 0;
1182 bail:
1183         if (inode)
1184                 iput(inode);
1185
1186         mlog_exit(status);
1187
1188         return status;
1189 }
1190
1191 static void ocfs2_inode_init_once(void *data)
1192 {
1193         struct ocfs2_inode_info *oi = data;
1194
1195         oi->ip_flags = 0;
1196         oi->ip_open_count = 0;
1197         spin_lock_init(&oi->ip_lock);
1198         ocfs2_extent_map_init(&oi->vfs_inode);
1199         INIT_LIST_HEAD(&oi->ip_io_markers);
1200         oi->ip_created_trans = 0;
1201         oi->ip_last_trans = 0;
1202         oi->ip_dir_start_lookup = 0;
1203
1204         init_rwsem(&oi->ip_alloc_sem);
1205         init_rwsem(&oi->ip_xattr_sem);
1206         mutex_init(&oi->ip_io_mutex);
1207
1208         oi->ip_blkno = 0ULL;
1209         oi->ip_clusters = 0;
1210
1211         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1212         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1213         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1214
1215         ocfs2_metadata_cache_init(&oi->vfs_inode);
1216
1217         inode_init_once(&oi->vfs_inode);
1218 }
1219
1220 static int ocfs2_initialize_mem_caches(void)
1221 {
1222         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1223                                        sizeof(struct ocfs2_inode_info),
1224                                        0,
1225                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1226                                                 SLAB_MEM_SPREAD),
1227                                        ocfs2_inode_init_once);
1228         if (!ocfs2_inode_cachep)
1229                 return -ENOMEM;
1230
1231         return 0;
1232 }
1233
1234 static void ocfs2_free_mem_caches(void)
1235 {
1236         if (ocfs2_inode_cachep)
1237                 kmem_cache_destroy(ocfs2_inode_cachep);
1238
1239         ocfs2_inode_cachep = NULL;
1240 }
1241
1242 static int ocfs2_get_sector(struct super_block *sb,
1243                             struct buffer_head **bh,
1244                             int block,
1245                             int sect_size)
1246 {
1247         if (!sb_set_blocksize(sb, sect_size)) {
1248                 mlog(ML_ERROR, "unable to set blocksize\n");
1249                 return -EIO;
1250         }
1251
1252         *bh = sb_getblk(sb, block);
1253         if (!*bh) {
1254                 mlog_errno(-EIO);
1255                 return -EIO;
1256         }
1257         lock_buffer(*bh);
1258         if (!buffer_dirty(*bh))
1259                 clear_buffer_uptodate(*bh);
1260         unlock_buffer(*bh);
1261         ll_rw_block(READ, 1, bh);
1262         wait_on_buffer(*bh);
1263         return 0;
1264 }
1265
1266 static int ocfs2_mount_volume(struct super_block *sb)
1267 {
1268         int status = 0;
1269         int unlock_super = 0;
1270         struct ocfs2_super *osb = OCFS2_SB(sb);
1271
1272         mlog_entry_void();
1273
1274         if (ocfs2_is_hard_readonly(osb))
1275                 goto leave;
1276
1277         status = ocfs2_dlm_init(osb);
1278         if (status < 0) {
1279                 mlog_errno(status);
1280                 goto leave;
1281         }
1282
1283         status = ocfs2_super_lock(osb, 1);
1284         if (status < 0) {
1285                 mlog_errno(status);
1286                 goto leave;
1287         }
1288         unlock_super = 1;
1289
1290         /* This will load up the node map and add ourselves to it. */
1291         status = ocfs2_find_slot(osb);
1292         if (status < 0) {
1293                 mlog_errno(status);
1294                 goto leave;
1295         }
1296
1297         /* load all node-local system inodes */
1298         status = ocfs2_init_local_system_inodes(osb);
1299         if (status < 0) {
1300                 mlog_errno(status);
1301                 goto leave;
1302         }
1303
1304         status = ocfs2_check_volume(osb);
1305         if (status < 0) {
1306                 mlog_errno(status);
1307                 goto leave;
1308         }
1309
1310         status = ocfs2_truncate_log_init(osb);
1311         if (status < 0) {
1312                 mlog_errno(status);
1313                 goto leave;
1314         }
1315
1316         if (ocfs2_mount_local(osb))
1317                 goto leave;
1318
1319 leave:
1320         if (unlock_super)
1321                 ocfs2_super_unlock(osb, 1);
1322
1323         mlog_exit(status);
1324         return status;
1325 }
1326
1327 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1328 {
1329         int tmp, hangup_needed = 0;
1330         struct ocfs2_super *osb = NULL;
1331         char nodestr[8];
1332
1333         mlog_entry("(0x%p)\n", sb);
1334
1335         BUG_ON(!sb);
1336         osb = OCFS2_SB(sb);
1337         BUG_ON(!osb);
1338
1339         ocfs2_shutdown_local_alloc(osb);
1340
1341         ocfs2_truncate_log_shutdown(osb);
1342
1343         /* This will disable recovery and flush any recovery work. */
1344         ocfs2_recovery_exit(osb);
1345
1346         ocfs2_journal_shutdown(osb);
1347
1348         ocfs2_sync_blockdev(sb);
1349
1350         /* No cluster connection means we've failed during mount, so skip
1351          * all the steps which depended on that to complete. */
1352         if (osb->cconn) {
1353                 tmp = ocfs2_super_lock(osb, 1);
1354                 if (tmp < 0) {
1355                         mlog_errno(tmp);
1356                         return;
1357                 }
1358         }
1359
1360         if (osb->slot_num != OCFS2_INVALID_SLOT)
1361                 ocfs2_put_slot(osb);
1362
1363         if (osb->cconn)
1364                 ocfs2_super_unlock(osb, 1);
1365
1366         ocfs2_release_system_inodes(osb);
1367
1368         /*
1369          * If we're dismounting due to mount error, mount.ocfs2 will clean
1370          * up heartbeat.  If we're a local mount, there is no heartbeat.
1371          * If we failed before we got a uuid_str yet, we can't stop
1372          * heartbeat.  Otherwise, do it.
1373          */
1374         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1375                 hangup_needed = 1;
1376
1377         if (osb->cconn)
1378                 ocfs2_dlm_shutdown(osb, hangup_needed);
1379
1380         debugfs_remove(osb->osb_debug_root);
1381
1382         if (hangup_needed)
1383                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1384
1385         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1386
1387         if (ocfs2_mount_local(osb))
1388                 snprintf(nodestr, sizeof(nodestr), "local");
1389         else
1390                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1391
1392         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1393                osb->dev_str, nodestr);
1394
1395         ocfs2_delete_osb(osb);
1396         kfree(osb);
1397         sb->s_dev = 0;
1398         sb->s_fs_info = NULL;
1399 }
1400
1401 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1402                                 unsigned uuid_bytes)
1403 {
1404         int i, ret;
1405         char *ptr;
1406
1407         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1408
1409         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1410         if (osb->uuid_str == NULL)
1411                 return -ENOMEM;
1412
1413         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1414                 /* print with null */
1415                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1416                 if (ret != 2) /* drop super cleans up */
1417                         return -EINVAL;
1418                 /* then only advance past the last char */
1419                 ptr += 2;
1420         }
1421
1422         return 0;
1423 }
1424
1425 static int ocfs2_initialize_super(struct super_block *sb,
1426                                   struct buffer_head *bh,
1427                                   int sector_size)
1428 {
1429         int status;
1430         int i, cbits, bbits;
1431         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1432         struct inode *inode = NULL;
1433         struct ocfs2_journal *journal;
1434         __le32 uuid_net_key;
1435         struct ocfs2_super *osb;
1436
1437         mlog_entry_void();
1438
1439         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1440         if (!osb) {
1441                 status = -ENOMEM;
1442                 mlog_errno(status);
1443                 goto bail;
1444         }
1445
1446         sb->s_fs_info = osb;
1447         sb->s_op = &ocfs2_sops;
1448         sb->s_export_op = &ocfs2_export_ops;
1449         sb->s_xattr = ocfs2_xattr_handlers;
1450         sb->s_time_gran = 1;
1451         sb->s_flags |= MS_NOATIME;
1452         /* this is needed to support O_LARGEFILE */
1453         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1454         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1455         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1456
1457         osb->sb = sb;
1458         /* Save off for ocfs2_rw_direct */
1459         osb->s_sectsize_bits = blksize_bits(sector_size);
1460         BUG_ON(!osb->s_sectsize_bits);
1461
1462         spin_lock_init(&osb->dc_task_lock);
1463         init_waitqueue_head(&osb->dc_event);
1464         osb->dc_work_sequence = 0;
1465         osb->dc_wake_sequence = 0;
1466         INIT_LIST_HEAD(&osb->blocked_lock_list);
1467         osb->blocked_lock_count = 0;
1468         spin_lock_init(&osb->osb_lock);
1469         ocfs2_init_inode_steal_slot(osb);
1470
1471         atomic_set(&osb->alloc_stats.moves, 0);
1472         atomic_set(&osb->alloc_stats.local_data, 0);
1473         atomic_set(&osb->alloc_stats.bitmap_data, 0);
1474         atomic_set(&osb->alloc_stats.bg_allocs, 0);
1475         atomic_set(&osb->alloc_stats.bg_extends, 0);
1476
1477         ocfs2_init_node_maps(osb);
1478
1479         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1480                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1481
1482         status = ocfs2_recovery_init(osb);
1483         if (status) {
1484                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
1485                 mlog_errno(status);
1486                 goto bail;
1487         }
1488
1489         init_waitqueue_head(&osb->checkpoint_event);
1490         atomic_set(&osb->needs_checkpoint, 0);
1491
1492         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1493
1494         osb->slot_num = OCFS2_INVALID_SLOT;
1495
1496         osb->s_xattr_inline_size = le16_to_cpu(
1497                                         di->id2.i_super.s_xattr_inline_size);
1498
1499         osb->local_alloc_state = OCFS2_LA_UNUSED;
1500         osb->local_alloc_bh = NULL;
1501         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
1502
1503         init_waitqueue_head(&osb->osb_mount_event);
1504
1505         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
1506         if (!osb->vol_label) {
1507                 mlog(ML_ERROR, "unable to alloc vol label\n");
1508                 status = -ENOMEM;
1509                 goto bail;
1510         }
1511
1512         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
1513         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
1514                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
1515                      osb->max_slots);
1516                 status = -EINVAL;
1517                 goto bail;
1518         }
1519         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
1520
1521         osb->slot_recovery_generations =
1522                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
1523                         GFP_KERNEL);
1524         if (!osb->slot_recovery_generations) {
1525                 status = -ENOMEM;
1526                 mlog_errno(status);
1527                 goto bail;
1528         }
1529
1530         init_waitqueue_head(&osb->osb_wipe_event);
1531         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
1532                                         sizeof(*osb->osb_orphan_wipes),
1533                                         GFP_KERNEL);
1534         if (!osb->osb_orphan_wipes) {
1535                 status = -ENOMEM;
1536                 mlog_errno(status);
1537                 goto bail;
1538         }
1539
1540         osb->s_feature_compat =
1541                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
1542         osb->s_feature_ro_compat =
1543                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
1544         osb->s_feature_incompat =
1545                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
1546
1547         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
1548                 mlog(ML_ERROR, "couldn't mount because of unsupported "
1549                      "optional features (%x).\n", i);
1550                 status = -EINVAL;
1551                 goto bail;
1552         }
1553         if (!(osb->sb->s_flags & MS_RDONLY) &&
1554             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
1555                 mlog(ML_ERROR, "couldn't mount RDWR because of "
1556                      "unsupported optional features (%x).\n", i);
1557                 status = -EINVAL;
1558                 goto bail;
1559         }
1560
1561         if (ocfs2_userspace_stack(osb)) {
1562                 memcpy(osb->osb_cluster_stack,
1563                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
1564                        OCFS2_STACK_LABEL_LEN);
1565                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1566                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
1567                         mlog(ML_ERROR,
1568                              "couldn't mount because of an invalid "
1569                              "cluster stack label (%s) \n",
1570                              osb->osb_cluster_stack);
1571                         status = -EINVAL;
1572                         goto bail;
1573                 }
1574         } else {
1575                 /* The empty string is identical with classic tools that
1576                  * don't know about s_cluster_info. */
1577                 osb->osb_cluster_stack[0] = '\0';
1578         }
1579
1580         get_random_bytes(&osb->s_next_generation, sizeof(u32));
1581
1582         /* FIXME
1583          * This should be done in ocfs2_journal_init(), but unknown
1584          * ordering issues will cause the filesystem to crash.
1585          * If anyone wants to figure out what part of the code
1586          * refers to osb->journal before ocfs2_journal_init() is run,
1587          * be my guest.
1588          */
1589         /* initialize our journal structure */
1590
1591         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
1592         if (!journal) {
1593                 mlog(ML_ERROR, "unable to alloc journal\n");
1594                 status = -ENOMEM;
1595                 goto bail;
1596         }
1597         osb->journal = journal;
1598         journal->j_osb = osb;
1599
1600         atomic_set(&journal->j_num_trans, 0);
1601         init_rwsem(&journal->j_trans_barrier);
1602         init_waitqueue_head(&journal->j_checkpointed);
1603         spin_lock_init(&journal->j_lock);
1604         journal->j_trans_id = (unsigned long) 1;
1605         INIT_LIST_HEAD(&journal->j_la_cleanups);
1606         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
1607         journal->j_state = OCFS2_JOURNAL_FREE;
1608
1609         /* get some pseudo constants for clustersize bits */
1610         osb->s_clustersize_bits =
1611                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1612         osb->s_clustersize = 1 << osb->s_clustersize_bits;
1613         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
1614
1615         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
1616             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
1617                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
1618                      osb->s_clustersize);
1619                 status = -EINVAL;
1620                 goto bail;
1621         }
1622
1623         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
1624             > (u32)~0UL) {
1625                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
1626                      "what jbd can address in 32 bits.\n");
1627                 status = -EINVAL;
1628                 goto bail;
1629         }
1630
1631         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
1632                                  sizeof(di->id2.i_super.s_uuid))) {
1633                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
1634                 status = -ENOMEM;
1635                 goto bail;
1636         }
1637
1638         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
1639
1640         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
1641         osb->vol_label[63] = '\0';
1642         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
1643         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
1644         osb->first_cluster_group_blkno =
1645                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
1646         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
1647         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
1648         mlog(0, "vol_label: %s\n", osb->vol_label);
1649         mlog(0, "uuid: %s\n", osb->uuid_str);
1650         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
1651              (unsigned long long)osb->root_blkno,
1652              (unsigned long long)osb->system_dir_blkno);
1653
1654         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
1655         if (!osb->osb_dlm_debug) {
1656                 status = -ENOMEM;
1657                 mlog_errno(status);
1658                 goto bail;
1659         }
1660
1661         atomic_set(&osb->vol_state, VOLUME_INIT);
1662
1663         /* load root, system_dir, and all global system inodes */
1664         status = ocfs2_init_global_system_inodes(osb);
1665         if (status < 0) {
1666                 mlog_errno(status);
1667                 goto bail;
1668         }
1669
1670         /*
1671          * global bitmap
1672          */
1673         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
1674                                             OCFS2_INVALID_SLOT);
1675         if (!inode) {
1676                 status = -EINVAL;
1677                 mlog_errno(status);
1678                 goto bail;
1679         }
1680
1681         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
1682         iput(inode);
1683
1684         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
1685
1686         status = ocfs2_init_slot_info(osb);
1687         if (status < 0) {
1688                 mlog_errno(status);
1689                 goto bail;
1690         }
1691
1692 bail:
1693         mlog_exit(status);
1694         return status;
1695 }
1696
1697 /*
1698  * will return: -EAGAIN if it is ok to keep searching for superblocks
1699  *              -EINVAL if there is a bad superblock
1700  *              0 on success
1701  */
1702 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
1703                                struct buffer_head *bh,
1704                                u32 blksz)
1705 {
1706         int status = -EAGAIN;
1707
1708         mlog_entry_void();
1709
1710         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
1711                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
1712                 status = -EINVAL;
1713                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
1714                         mlog(ML_ERROR, "found superblock with incorrect block "
1715                              "size: found %u, should be %u\n",
1716                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
1717                                blksz);
1718                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
1719                            OCFS2_MAJOR_REV_LEVEL ||
1720                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
1721                            OCFS2_MINOR_REV_LEVEL) {
1722                         mlog(ML_ERROR, "found superblock with bad version: "
1723                              "found %u.%u, should be %u.%u\n",
1724                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
1725                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
1726                              OCFS2_MAJOR_REV_LEVEL,
1727                              OCFS2_MINOR_REV_LEVEL);
1728                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
1729                         mlog(ML_ERROR, "bad block number on superblock: "
1730                              "found %llu, should be %llu\n",
1731                              (unsigned long long)le64_to_cpu(di->i_blkno),
1732                              (unsigned long long)bh->b_blocknr);
1733                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
1734                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
1735                         mlog(ML_ERROR, "bad cluster size found: %u\n",
1736                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
1737                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
1738                         mlog(ML_ERROR, "bad root_blkno: 0\n");
1739                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
1740                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
1741                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
1742                         mlog(ML_ERROR,
1743                              "Superblock slots found greater than file system "
1744                              "maximum: found %u, max %u\n",
1745                              le16_to_cpu(di->id2.i_super.s_max_slots),
1746                              OCFS2_MAX_SLOTS);
1747                 } else {
1748                         /* found it! */
1749                         status = 0;
1750                 }
1751         }
1752
1753         mlog_exit(status);
1754         return status;
1755 }
1756
1757 static int ocfs2_check_volume(struct ocfs2_super *osb)
1758 {
1759         int status;
1760         int dirty;
1761         int local;
1762         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
1763                                                   * recover
1764                                                   * ourselves. */
1765
1766         mlog_entry_void();
1767
1768         /* Init our journal object. */
1769         status = ocfs2_journal_init(osb->journal, &dirty);
1770         if (status < 0) {
1771                 mlog(ML_ERROR, "Could not initialize journal!\n");
1772                 goto finally;
1773         }
1774
1775         /* If the journal was unmounted cleanly then we don't want to
1776          * recover anything. Otherwise, journal_load will do that
1777          * dirty work for us :) */
1778         if (!dirty) {
1779                 status = ocfs2_journal_wipe(osb->journal, 0);
1780                 if (status < 0) {
1781                         mlog_errno(status);
1782                         goto finally;
1783                 }
1784         } else {
1785                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
1786                      "recovering volume.\n");
1787         }
1788
1789         local = ocfs2_mount_local(osb);
1790
1791         /* will play back anything left in the journal. */
1792         status = ocfs2_journal_load(osb->journal, local, dirty);
1793         if (status < 0) {
1794                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
1795                 goto finally;
1796         }
1797
1798         if (dirty) {
1799                 /* recover my local alloc if we didn't unmount cleanly. */
1800                 status = ocfs2_begin_local_alloc_recovery(osb,
1801                                                           osb->slot_num,
1802                                                           &local_alloc);
1803                 if (status < 0) {
1804                         mlog_errno(status);
1805                         goto finally;
1806                 }
1807                 /* we complete the recovery process after we've marked
1808                  * ourselves as mounted. */
1809         }
1810
1811         mlog(0, "Journal loaded.\n");
1812
1813         status = ocfs2_load_local_alloc(osb);
1814         if (status < 0) {
1815                 mlog_errno(status);
1816                 goto finally;
1817         }
1818
1819         if (dirty) {
1820                 /* Recovery will be completed after we've mounted the
1821                  * rest of the volume. */
1822                 osb->dirty = 1;
1823                 osb->local_alloc_copy = local_alloc;
1824                 local_alloc = NULL;
1825         }
1826
1827         /* go through each journal, trylock it and if you get the
1828          * lock, and it's marked as dirty, set the bit in the recover
1829          * map and launch a recovery thread for it. */
1830         status = ocfs2_mark_dead_nodes(osb);
1831         if (status < 0)
1832                 mlog_errno(status);
1833
1834 finally:
1835         if (local_alloc)
1836                 kfree(local_alloc);
1837
1838         mlog_exit(status);
1839         return status;
1840 }
1841
1842 /*
1843  * The routine gets called from dismount or close whenever a dismount on
1844  * volume is requested and the osb open count becomes 1.
1845  * It will remove the osb from the global list and also free up all the
1846  * initialized resources and fileobject.
1847  */
1848 static void ocfs2_delete_osb(struct ocfs2_super *osb)
1849 {
1850         mlog_entry_void();
1851
1852         /* This function assumes that the caller has the main osb resource */
1853
1854         ocfs2_free_slot_info(osb);
1855
1856         kfree(osb->osb_orphan_wipes);
1857         kfree(osb->slot_recovery_generations);
1858         /* FIXME
1859          * This belongs in journal shutdown, but because we have to
1860          * allocate osb->journal at the start of ocfs2_initalize_osb(),
1861          * we free it here.
1862          */
1863         kfree(osb->journal);
1864         if (osb->local_alloc_copy)
1865                 kfree(osb->local_alloc_copy);
1866         kfree(osb->uuid_str);
1867         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
1868         memset(osb, 0, sizeof(struct ocfs2_super));
1869
1870         mlog_exit_void();
1871 }
1872
1873 /* Put OCFS2 into a readonly state, or (if the user specifies it),
1874  * panic(). We do not support continue-on-error operation. */
1875 static void ocfs2_handle_error(struct super_block *sb)
1876 {
1877         struct ocfs2_super *osb = OCFS2_SB(sb);
1878
1879         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
1880                 panic("OCFS2: (device %s): panic forced after error\n",
1881                       sb->s_id);
1882
1883         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
1884
1885         if (sb->s_flags & MS_RDONLY &&
1886             (ocfs2_is_soft_readonly(osb) ||
1887              ocfs2_is_hard_readonly(osb)))
1888                 return;
1889
1890         printk(KERN_CRIT "File system is now read-only due to the potential "
1891                "of on-disk corruption. Please run fsck.ocfs2 once the file "
1892                "system is unmounted.\n");
1893         sb->s_flags |= MS_RDONLY;
1894         ocfs2_set_ro_flag(osb, 0);
1895 }
1896
1897 static char error_buf[1024];
1898
1899 void __ocfs2_error(struct super_block *sb,
1900                    const char *function,
1901                    const char *fmt, ...)
1902 {
1903         va_list args;
1904
1905         va_start(args, fmt);
1906         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1907         va_end(args);
1908
1909         /* Not using mlog here because we want to show the actual
1910          * function the error came from. */
1911         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
1912                sb->s_id, function, error_buf);
1913
1914         ocfs2_handle_error(sb);
1915 }
1916
1917 /* Handle critical errors. This is intentionally more drastic than
1918  * ocfs2_handle_error, so we only use for things like journal errors,
1919  * etc. */
1920 void __ocfs2_abort(struct super_block* sb,
1921                    const char *function,
1922                    const char *fmt, ...)
1923 {
1924         va_list args;
1925
1926         va_start(args, fmt);
1927         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1928         va_end(args);
1929
1930         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
1931                sb->s_id, function, error_buf);
1932
1933         /* We don't have the cluster support yet to go straight to
1934          * hard readonly in here. Until then, we want to keep
1935          * ocfs2_abort() so that we can at least mark critical
1936          * errors.
1937          *
1938          * TODO: This should abort the journal and alert other nodes
1939          * that our slot needs recovery. */
1940
1941         /* Force a panic(). This stinks, but it's better than letting
1942          * things continue without having a proper hard readonly
1943          * here. */
1944         OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1945         ocfs2_handle_error(sb);
1946 }
1947
1948 module_init(ocfs2_init);
1949 module_exit(ocfs2_exit);