linux/fs/ocfs2/super.c
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   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/init.h>
  32#include <linux/random.h>
  33#include <linux/statfs.h>
  34#include <linux/moduleparam.h>
  35#include <linux/blkdev.h>
  36#include <linux/socket.h>
  37#include <linux/inet.h>
  38#include <linux/parser.h>
  39#include <linux/crc32.h>
  40#include <linux/debugfs.h>
  41#include <linux/mount.h>
  42#include <linux/seq_file.h>
  43#include <linux/quotaops.h>
  44#include <linux/cleancache.h>
  45
  46#define CREATE_TRACE_POINTS
  47#include "ocfs2_trace.h"
  48
  49#include <cluster/masklog.h>
  50
  51#include "ocfs2.h"
  52
  53/* this should be the only file to include a version 1 header */
  54#include "ocfs1_fs_compat.h"
  55
  56#include "alloc.h"
  57#include "aops.h"
  58#include "blockcheck.h"
  59#include "dlmglue.h"
  60#include "export.h"
  61#include "extent_map.h"
  62#include "heartbeat.h"
  63#include "inode.h"
  64#include "journal.h"
  65#include "localalloc.h"
  66#include "namei.h"
  67#include "slot_map.h"
  68#include "super.h"
  69#include "sysfile.h"
  70#include "uptodate.h"
  71#include "ver.h"
  72#include "xattr.h"
  73#include "quota.h"
  74#include "refcounttree.h"
  75#include "suballoc.h"
  76
  77#include "buffer_head_io.h"
  78
  79static struct kmem_cache *ocfs2_inode_cachep = NULL;
  80struct kmem_cache *ocfs2_dquot_cachep;
  81struct kmem_cache *ocfs2_qf_chunk_cachep;
  82
  83/* OCFS2 needs to schedule several different types of work which
  84 * require cluster locking, disk I/O, recovery waits, etc. Since these
  85 * types of work tend to be heavy we avoid using the kernel events
  86 * workqueue and schedule on our own. */
  87struct workqueue_struct *ocfs2_wq = NULL;
  88
  89static struct dentry *ocfs2_debugfs_root = NULL;
  90
  91MODULE_AUTHOR("Oracle");
  92MODULE_LICENSE("GPL");
  93
  94struct mount_options
  95{
  96        unsigned long   commit_interval;
  97        unsigned long   mount_opt;
  98        unsigned int    atime_quantum;
  99        signed short    slot;
 100        int             localalloc_opt;
 101        unsigned int    resv_level;
 102        int             dir_resv_level;
 103        char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
 104};
 105
 106static int ocfs2_parse_options(struct super_block *sb, char *options,
 107                               struct mount_options *mopt,
 108                               int is_remount);
 109static int ocfs2_check_set_options(struct super_block *sb,
 110                                   struct mount_options *options);
 111static int ocfs2_show_options(struct seq_file *s, struct dentry *root);
 112static void ocfs2_put_super(struct super_block *sb);
 113static int ocfs2_mount_volume(struct super_block *sb);
 114static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 115static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 116static int ocfs2_initialize_mem_caches(void);
 117static void ocfs2_free_mem_caches(void);
 118static void ocfs2_delete_osb(struct ocfs2_super *osb);
 119
 120static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 121
 122static int ocfs2_sync_fs(struct super_block *sb, int wait);
 123
 124static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 125static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 126static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 127static int ocfs2_check_volume(struct ocfs2_super *osb);
 128static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 129                               struct buffer_head *bh,
 130                               u32 sectsize,
 131                               struct ocfs2_blockcheck_stats *stats);
 132static int ocfs2_initialize_super(struct super_block *sb,
 133                                  struct buffer_head *bh,
 134                                  int sector_size,
 135                                  struct ocfs2_blockcheck_stats *stats);
 136static int ocfs2_get_sector(struct super_block *sb,
 137                            struct buffer_head **bh,
 138                            int block,
 139                            int sect_size);
 140static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 141static void ocfs2_destroy_inode(struct inode *inode);
 142static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
 143static int ocfs2_enable_quotas(struct ocfs2_super *osb);
 144static void ocfs2_disable_quotas(struct ocfs2_super *osb);
 145
 146static const struct super_operations ocfs2_sops = {
 147        .statfs         = ocfs2_statfs,
 148        .alloc_inode    = ocfs2_alloc_inode,
 149        .destroy_inode  = ocfs2_destroy_inode,
 150        .drop_inode     = ocfs2_drop_inode,
 151        .evict_inode    = ocfs2_evict_inode,
 152        .sync_fs        = ocfs2_sync_fs,
 153        .put_super      = ocfs2_put_super,
 154        .remount_fs     = ocfs2_remount,
 155        .show_options   = ocfs2_show_options,
 156        .quota_read     = ocfs2_quota_read,
 157        .quota_write    = ocfs2_quota_write,
 158};
 159
 160enum {
 161        Opt_barrier,
 162        Opt_err_panic,
 163        Opt_err_ro,
 164        Opt_intr,
 165        Opt_nointr,
 166        Opt_hb_none,
 167        Opt_hb_local,
 168        Opt_hb_global,
 169        Opt_data_ordered,
 170        Opt_data_writeback,
 171        Opt_atime_quantum,
 172        Opt_slot,
 173        Opt_commit,
 174        Opt_localalloc,
 175        Opt_localflocks,
 176        Opt_stack,
 177        Opt_user_xattr,
 178        Opt_nouser_xattr,
 179        Opt_inode64,
 180        Opt_acl,
 181        Opt_noacl,
 182        Opt_usrquota,
 183        Opt_grpquota,
 184        Opt_coherency_buffered,
 185        Opt_coherency_full,
 186        Opt_resv_level,
 187        Opt_dir_resv_level,
 188        Opt_err,
 189};
 190
 191static const match_table_t tokens = {
 192        {Opt_barrier, "barrier=%u"},
 193        {Opt_err_panic, "errors=panic"},
 194        {Opt_err_ro, "errors=remount-ro"},
 195        {Opt_intr, "intr"},
 196        {Opt_nointr, "nointr"},
 197        {Opt_hb_none, OCFS2_HB_NONE},
 198        {Opt_hb_local, OCFS2_HB_LOCAL},
 199        {Opt_hb_global, OCFS2_HB_GLOBAL},
 200        {Opt_data_ordered, "data=ordered"},
 201        {Opt_data_writeback, "data=writeback"},
 202        {Opt_atime_quantum, "atime_quantum=%u"},
 203        {Opt_slot, "preferred_slot=%u"},
 204        {Opt_commit, "commit=%u"},
 205        {Opt_localalloc, "localalloc=%d"},
 206        {Opt_localflocks, "localflocks"},
 207        {Opt_stack, "cluster_stack=%s"},
 208        {Opt_user_xattr, "user_xattr"},
 209        {Opt_nouser_xattr, "nouser_xattr"},
 210        {Opt_inode64, "inode64"},
 211        {Opt_acl, "acl"},
 212        {Opt_noacl, "noacl"},
 213        {Opt_usrquota, "usrquota"},
 214        {Opt_grpquota, "grpquota"},
 215        {Opt_coherency_buffered, "coherency=buffered"},
 216        {Opt_coherency_full, "coherency=full"},
 217        {Opt_resv_level, "resv_level=%u"},
 218        {Opt_dir_resv_level, "dir_resv_level=%u"},
 219        {Opt_err, NULL}
 220};
 221
 222#ifdef CONFIG_DEBUG_FS
 223static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
 224{
 225        struct ocfs2_cluster_connection *cconn = osb->cconn;
 226        struct ocfs2_recovery_map *rm = osb->recovery_map;
 227        struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
 228        int i, out = 0;
 229
 230        out += snprintf(buf + out, len - out,
 231                        "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
 232                        "Device", osb->dev_str, osb->uuid_str,
 233                        osb->fs_generation, osb->vol_label);
 234
 235        out += snprintf(buf + out, len - out,
 236                        "%10s => State: %d  Flags: 0x%lX\n", "Volume",
 237                        atomic_read(&osb->vol_state), osb->osb_flags);
 238
 239        out += snprintf(buf + out, len - out,
 240                        "%10s => Block: %lu  Cluster: %d\n", "Sizes",
 241                        osb->sb->s_blocksize, osb->s_clustersize);
 242
 243        out += snprintf(buf + out, len - out,
 244                        "%10s => Compat: 0x%X  Incompat: 0x%X  "
 245                        "ROcompat: 0x%X\n",
 246                        "Features", osb->s_feature_compat,
 247                        osb->s_feature_incompat, osb->s_feature_ro_compat);
 248
 249        out += snprintf(buf + out, len - out,
 250                        "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
 251                        osb->s_mount_opt, osb->s_atime_quantum);
 252
 253        if (cconn) {
 254                out += snprintf(buf + out, len - out,
 255                                "%10s => Stack: %s  Name: %*s  "
 256                                "Version: %d.%d\n", "Cluster",
 257                                (*osb->osb_cluster_stack == '\0' ?
 258                                 "o2cb" : osb->osb_cluster_stack),
 259                                cconn->cc_namelen, cconn->cc_name,
 260                                cconn->cc_version.pv_major,
 261                                cconn->cc_version.pv_minor);
 262        }
 263
 264        spin_lock(&osb->dc_task_lock);
 265        out += snprintf(buf + out, len - out,
 266                        "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
 267                        "WorkSeq: %lu\n", "DownCnvt",
 268                        (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
 269                        osb->blocked_lock_count, osb->dc_wake_sequence,
 270                        osb->dc_work_sequence);
 271        spin_unlock(&osb->dc_task_lock);
 272
 273        spin_lock(&osb->osb_lock);
 274        out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
 275                        "Recovery",
 276                        (osb->recovery_thread_task ?
 277                         task_pid_nr(osb->recovery_thread_task) : -1));
 278        if (rm->rm_used == 0)
 279                out += snprintf(buf + out, len - out, " None\n");
 280        else {
 281                for (i = 0; i < rm->rm_used; i++)
 282                        out += snprintf(buf + out, len - out, " %d",
 283                                        rm->rm_entries[i]);
 284                out += snprintf(buf + out, len - out, "\n");
 285        }
 286        spin_unlock(&osb->osb_lock);
 287
 288        out += snprintf(buf + out, len - out,
 289                        "%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
 290                        (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
 291                        osb->osb_commit_interval,
 292                        atomic_read(&osb->needs_checkpoint));
 293
 294        out += snprintf(buf + out, len - out,
 295                        "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
 296                        "Journal", osb->journal->j_state,
 297                        osb->journal->j_trans_id,
 298                        atomic_read(&osb->journal->j_num_trans));
 299
 300        out += snprintf(buf + out, len - out,
 301                        "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
 302                        "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
 303                        "Stats",
 304                        atomic_read(&osb->alloc_stats.bitmap_data),
 305                        atomic_read(&osb->alloc_stats.local_data),
 306                        atomic_read(&osb->alloc_stats.bg_allocs),
 307                        atomic_read(&osb->alloc_stats.moves),
 308                        atomic_read(&osb->alloc_stats.bg_extends));
 309
 310        out += snprintf(buf + out, len - out,
 311                        "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
 312                        "Default: %u bits\n",
 313                        "LocalAlloc", osb->local_alloc_state,
 314                        (unsigned long long)osb->la_last_gd,
 315                        osb->local_alloc_bits, osb->local_alloc_default_bits);
 316
 317        spin_lock(&osb->osb_lock);
 318        out += snprintf(buf + out, len - out,
 319                        "%10s => InodeSlot: %d  StolenInodes: %d, "
 320                        "MetaSlot: %d  StolenMeta: %d\n", "Steal",
 321                        osb->s_inode_steal_slot,
 322                        atomic_read(&osb->s_num_inodes_stolen),
 323                        osb->s_meta_steal_slot,
 324                        atomic_read(&osb->s_num_meta_stolen));
 325        spin_unlock(&osb->osb_lock);
 326
 327        out += snprintf(buf + out, len - out, "OrphanScan => ");
 328        out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
 329                        os->os_count, os->os_seqno);
 330        out += snprintf(buf + out, len - out, " Last Scan: ");
 331        if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
 332                out += snprintf(buf + out, len - out, "Disabled\n");
 333        else
 334                out += snprintf(buf + out, len - out, "%lu seconds ago\n",
 335                                (get_seconds() - os->os_scantime.tv_sec));
 336
 337        out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
 338                        "Slots", "Num", "RecoGen");
 339        for (i = 0; i < osb->max_slots; ++i) {
 340                out += snprintf(buf + out, len - out,
 341                                "%10s  %c %3d  %10d\n",
 342                                " ",
 343                                (i == osb->slot_num ? '*' : ' '),
 344                                i, osb->slot_recovery_generations[i]);
 345        }
 346
 347        return out;
 348}
 349
 350static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 351{
 352        struct ocfs2_super *osb = inode->i_private;
 353        char *buf = NULL;
 354
 355        buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 356        if (!buf)
 357                goto bail;
 358
 359        i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
 360
 361        file->private_data = buf;
 362
 363        return 0;
 364bail:
 365        return -ENOMEM;
 366}
 367
 368static int ocfs2_debug_release(struct inode *inode, struct file *file)
 369{
 370        kfree(file->private_data);
 371        return 0;
 372}
 373
 374static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 375                                size_t nbytes, loff_t *ppos)
 376{
 377        return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
 378                                       i_size_read(file->f_mapping->host));
 379}
 380#else
 381static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 382{
 383        return 0;
 384}
 385static int ocfs2_debug_release(struct inode *inode, struct file *file)
 386{
 387        return 0;
 388}
 389static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 390                                size_t nbytes, loff_t *ppos)
 391{
 392        return 0;
 393}
 394#endif  /* CONFIG_DEBUG_FS */
 395
 396static const struct file_operations ocfs2_osb_debug_fops = {
 397        .open =         ocfs2_osb_debug_open,
 398        .release =      ocfs2_debug_release,
 399        .read =         ocfs2_debug_read,
 400        .llseek =       generic_file_llseek,
 401};
 402
 403static int ocfs2_sync_fs(struct super_block *sb, int wait)
 404{
 405        int status;
 406        tid_t target;
 407        struct ocfs2_super *osb = OCFS2_SB(sb);
 408
 409        if (ocfs2_is_hard_readonly(osb))
 410                return -EROFS;
 411
 412        if (wait) {
 413                status = ocfs2_flush_truncate_log(osb);
 414                if (status < 0)
 415                        mlog_errno(status);
 416        } else {
 417                ocfs2_schedule_truncate_log_flush(osb, 0);
 418        }
 419
 420        if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
 421                                      &target)) {
 422                if (wait)
 423                        jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 424                                             target);
 425        }
 426        return 0;
 427}
 428
 429static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
 430{
 431        if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
 432            && (ino == USER_QUOTA_SYSTEM_INODE
 433                || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
 434                return 0;
 435        if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
 436            && (ino == GROUP_QUOTA_SYSTEM_INODE
 437                || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
 438                return 0;
 439        return 1;
 440}
 441
 442static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 443{
 444        struct inode *new = NULL;
 445        int status = 0;
 446        int i;
 447
 448        new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 449        if (IS_ERR(new)) {
 450                status = PTR_ERR(new);
 451                mlog_errno(status);
 452                goto bail;
 453        }
 454        osb->root_inode = new;
 455
 456        new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 457        if (IS_ERR(new)) {
 458                status = PTR_ERR(new);
 459                mlog_errno(status);
 460                goto bail;
 461        }
 462        osb->sys_root_inode = new;
 463
 464        for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 465             i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 466                if (!ocfs2_need_system_inode(osb, i))
 467                        continue;
 468                new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 469                if (!new) {
 470                        ocfs2_release_system_inodes(osb);
 471                        status = -EINVAL;
 472                        mlog_errno(status);
 473                        /* FIXME: Should ERROR_RO_FS */
 474                        mlog(ML_ERROR, "Unable to load system inode %d, "
 475                             "possibly corrupt fs?", i);
 476                        goto bail;
 477                }
 478                // the array now has one ref, so drop this one
 479                iput(new);
 480        }
 481
 482bail:
 483        if (status)
 484                mlog_errno(status);
 485        return status;
 486}
 487
 488static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 489{
 490        struct inode *new = NULL;
 491        int status = 0;
 492        int i;
 493
 494        for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 495             i < NUM_SYSTEM_INODES;
 496             i++) {
 497                if (!ocfs2_need_system_inode(osb, i))
 498                        continue;
 499                new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 500                if (!new) {
 501                        ocfs2_release_system_inodes(osb);
 502                        status = -EINVAL;
 503                        mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 504                             status, i, osb->slot_num);
 505                        goto bail;
 506                }
 507                /* the array now has one ref, so drop this one */
 508                iput(new);
 509        }
 510
 511bail:
 512        if (status)
 513                mlog_errno(status);
 514        return status;
 515}
 516
 517static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 518{
 519        int i;
 520        struct inode *inode;
 521
 522        for (i = 0; i < NUM_GLOBAL_SYSTEM_INODES; i++) {
 523                inode = osb->global_system_inodes[i];
 524                if (inode) {
 525                        iput(inode);
 526                        osb->global_system_inodes[i] = NULL;
 527                }
 528        }
 529
 530        inode = osb->sys_root_inode;
 531        if (inode) {
 532                iput(inode);
 533                osb->sys_root_inode = NULL;
 534        }
 535
 536        inode = osb->root_inode;
 537        if (inode) {
 538                iput(inode);
 539                osb->root_inode = NULL;
 540        }
 541
 542        if (!osb->local_system_inodes)
 543                return;
 544
 545        for (i = 0; i < NUM_LOCAL_SYSTEM_INODES * osb->max_slots; i++) {
 546                if (osb->local_system_inodes[i]) {
 547                        iput(osb->local_system_inodes[i]);
 548                        osb->local_system_inodes[i] = NULL;
 549                }
 550        }
 551
 552        kfree(osb->local_system_inodes);
 553        osb->local_system_inodes = NULL;
 554}
 555
 556/* We're allocating fs objects, use GFP_NOFS */
 557static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 558{
 559        struct ocfs2_inode_info *oi;
 560
 561        oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 562        if (!oi)
 563                return NULL;
 564
 565        jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
 566        return &oi->vfs_inode;
 567}
 568
 569static void ocfs2_i_callback(struct rcu_head *head)
 570{
 571        struct inode *inode = container_of(head, struct inode, i_rcu);
 572        kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 573}
 574
 575static void ocfs2_destroy_inode(struct inode *inode)
 576{
 577        call_rcu(&inode->i_rcu, ocfs2_i_callback);
 578}
 579
 580static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 581                                                unsigned int cbits)
 582{
 583        unsigned int bytes = 1 << cbits;
 584        unsigned int trim = bytes;
 585        unsigned int bitshift = 32;
 586
 587        /*
 588         * i_size and all block offsets in ocfs2 are always 64 bits
 589         * wide. i_clusters is 32 bits, in cluster-sized units. So on
 590         * 64 bit platforms, cluster size will be the limiting factor.
 591         */
 592
 593#if BITS_PER_LONG == 32
 594# if defined(CONFIG_LBDAF)
 595        BUILD_BUG_ON(sizeof(sector_t) != 8);
 596        /*
 597         * We might be limited by page cache size.
 598         */
 599        if (bytes > PAGE_CACHE_SIZE) {
 600                bytes = PAGE_CACHE_SIZE;
 601                trim = 1;
 602                /*
 603                 * Shift by 31 here so that we don't get larger than
 604                 * MAX_LFS_FILESIZE
 605                 */
 606                bitshift = 31;
 607        }
 608# else
 609        /*
 610         * We are limited by the size of sector_t. Use block size, as
 611         * that's what we expose to the VFS.
 612         */
 613        bytes = 1 << bbits;
 614        trim = 1;
 615        bitshift = 31;
 616# endif
 617#endif
 618
 619        /*
 620         * Trim by a whole cluster when we can actually approach the
 621         * on-disk limits. Otherwise we can overflow i_clusters when
 622         * an extent start is at the max offset.
 623         */
 624        return (((unsigned long long)bytes) << bitshift) - trim;
 625}
 626
 627static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 628{
 629        int incompat_features;
 630        int ret = 0;
 631        struct mount_options parsed_options;
 632        struct ocfs2_super *osb = OCFS2_SB(sb);
 633        u32 tmp;
 634
 635        if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
 636            !ocfs2_check_set_options(sb, &parsed_options)) {
 637                ret = -EINVAL;
 638                goto out;
 639        }
 640
 641        tmp = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL |
 642                OCFS2_MOUNT_HB_NONE;
 643        if ((osb->s_mount_opt & tmp) != (parsed_options.mount_opt & tmp)) {
 644                ret = -EINVAL;
 645                mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 646                goto out;
 647        }
 648
 649        if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 650            (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 651                ret = -EINVAL;
 652                mlog(ML_ERROR, "Cannot change data mode on remount\n");
 653                goto out;
 654        }
 655
 656        /* Probably don't want this on remount; it might
 657         * mess with other nodes */
 658        if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 659            (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 660                ret = -EINVAL;
 661                mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 662                goto out;
 663        }
 664
 665        /* We're going to/from readonly mode. */
 666        if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 667                /* Disable quota accounting before remounting RO */
 668                if (*flags & MS_RDONLY) {
 669                        ret = ocfs2_susp_quotas(osb, 0);
 670                        if (ret < 0)
 671                                goto out;
 672                }
 673                /* Lock here so the check of HARD_RO and the potential
 674                 * setting of SOFT_RO is atomic. */
 675                spin_lock(&osb->osb_lock);
 676                if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 677                        mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 678                        ret = -EROFS;
 679                        goto unlock_osb;
 680                }
 681
 682                if (*flags & MS_RDONLY) {
 683                        sb->s_flags |= MS_RDONLY;
 684                        osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 685                } else {
 686                        if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 687                                mlog(ML_ERROR, "Cannot remount RDWR "
 688                                     "filesystem due to previous errors.\n");
 689                                ret = -EROFS;
 690                                goto unlock_osb;
 691                        }
 692                        incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 693                        if (incompat_features) {
 694                                mlog(ML_ERROR, "Cannot remount RDWR because "
 695                                     "of unsupported optional features "
 696                                     "(%x).\n", incompat_features);
 697                                ret = -EINVAL;
 698                                goto unlock_osb;
 699                        }
 700                        sb->s_flags &= ~MS_RDONLY;
 701                        osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 702                }
 703                trace_ocfs2_remount(sb->s_flags, osb->osb_flags, *flags);
 704unlock_osb:
 705                spin_unlock(&osb->osb_lock);
 706                /* Enable quota accounting after remounting RW */
 707                if (!ret && !(*flags & MS_RDONLY)) {
 708                        if (sb_any_quota_suspended(sb))
 709                                ret = ocfs2_susp_quotas(osb, 1);
 710                        else
 711                                ret = ocfs2_enable_quotas(osb);
 712                        if (ret < 0) {
 713                                /* Return back changes... */
 714                                spin_lock(&osb->osb_lock);
 715                                sb->s_flags |= MS_RDONLY;
 716                                osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 717                                spin_unlock(&osb->osb_lock);
 718                                goto out;
 719                        }
 720                }
 721        }
 722
 723        if (!ret) {
 724                /* Only save off the new mount options in case of a successful
 725                 * remount. */
 726                osb->s_mount_opt = parsed_options.mount_opt;
 727                osb->s_atime_quantum = parsed_options.atime_quantum;
 728                osb->preferred_slot = parsed_options.slot;
 729                if (parsed_options.commit_interval)
 730                        osb->osb_commit_interval = parsed_options.commit_interval;
 731
 732                if (!ocfs2_is_hard_readonly(osb))
 733                        ocfs2_set_journal_params(osb);
 734
 735                sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 736                        ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
 737                                                        MS_POSIXACL : 0);
 738        }
 739out:
 740        return ret;
 741}
 742
 743static int ocfs2_sb_probe(struct super_block *sb,
 744                          struct buffer_head **bh,
 745                          int *sector_size,
 746                          struct ocfs2_blockcheck_stats *stats)
 747{
 748        int status, tmpstat;
 749        struct ocfs1_vol_disk_hdr *hdr;
 750        struct ocfs2_dinode *di;
 751        int blksize;
 752
 753        *bh = NULL;
 754
 755        /* may be > 512 */
 756        *sector_size = bdev_logical_block_size(sb->s_bdev);
 757        if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 758                mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 759                     *sector_size, OCFS2_MAX_BLOCKSIZE);
 760                status = -EINVAL;
 761                goto bail;
 762        }
 763
 764        /* Can this really happen? */
 765        if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 766                *sector_size = OCFS2_MIN_BLOCKSIZE;
 767
 768        /* check block zero for old format */
 769        status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 770        if (status < 0) {
 771                mlog_errno(status);
 772                goto bail;
 773        }
 774        hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 775        if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 776                mlog(ML_ERROR, "incompatible version: %u.%u\n",
 777                     hdr->major_version, hdr->minor_version);
 778                status = -EINVAL;
 779        }
 780        if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 781                   strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 782                mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 783                     hdr->signature);
 784                status = -EINVAL;
 785        }
 786        brelse(*bh);
 787        *bh = NULL;
 788        if (status < 0) {
 789                mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 790                     "upgraded before mounting with ocfs v2\n");
 791                goto bail;
 792        }
 793
 794        /*
 795         * Now check at magic offset for 512, 1024, 2048, 4096
 796         * blocksizes.  4096 is the maximum blocksize because it is
 797         * the minimum clustersize.
 798         */
 799        status = -EINVAL;
 800        for (blksize = *sector_size;
 801             blksize <= OCFS2_MAX_BLOCKSIZE;
 802             blksize <<= 1) {
 803                tmpstat = ocfs2_get_sector(sb, bh,
 804                                           OCFS2_SUPER_BLOCK_BLKNO,
 805                                           blksize);
 806                if (tmpstat < 0) {
 807                        status = tmpstat;
 808                        mlog_errno(status);
 809                        break;
 810                }
 811                di = (struct ocfs2_dinode *) (*bh)->b_data;
 812                memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
 813                spin_lock_init(&stats->b_lock);
 814                tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
 815                if (tmpstat < 0) {
 816                        brelse(*bh);
 817                        *bh = NULL;
 818                }
 819                if (tmpstat != -EAGAIN) {
 820                        status = tmpstat;
 821                        break;
 822                }
 823        }
 824
 825bail:
 826        return status;
 827}
 828
 829static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 830{
 831        u32 hb_enabled = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL;
 832
 833        if (osb->s_mount_opt & hb_enabled) {
 834                if (ocfs2_mount_local(osb)) {
 835                        mlog(ML_ERROR, "Cannot heartbeat on a locally "
 836                             "mounted device.\n");
 837                        return -EINVAL;
 838                }
 839                if (ocfs2_userspace_stack(osb)) {
 840                        mlog(ML_ERROR, "Userspace stack expected, but "
 841                             "o2cb heartbeat arguments passed to mount\n");
 842                        return -EINVAL;
 843                }
 844                if (((osb->s_mount_opt & OCFS2_MOUNT_HB_GLOBAL) &&
 845                     !ocfs2_cluster_o2cb_global_heartbeat(osb)) ||
 846                    ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) &&
 847                     ocfs2_cluster_o2cb_global_heartbeat(osb))) {
 848                        mlog(ML_ERROR, "Mismatching o2cb heartbeat modes\n");
 849                        return -EINVAL;
 850                }
 851        }
 852
 853        if (!(osb->s_mount_opt & hb_enabled)) {
 854                if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 855                    !ocfs2_userspace_stack(osb)) {
 856                        mlog(ML_ERROR, "Heartbeat has to be started to mount "
 857                             "a read-write clustered device.\n");
 858                        return -EINVAL;
 859                }
 860        }
 861
 862        return 0;
 863}
 864
 865/*
 866 * If we're using a userspace stack, mount should have passed
 867 * a name that matches the disk.  If not, mount should not
 868 * have passed a stack.
 869 */
 870static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 871                                        struct mount_options *mopt)
 872{
 873        if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 874                mlog(ML_ERROR,
 875                     "cluster stack passed to mount, but this filesystem "
 876                     "does not support it\n");
 877                return -EINVAL;
 878        }
 879
 880        if (ocfs2_userspace_stack(osb) &&
 881            strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 882                    OCFS2_STACK_LABEL_LEN)) {
 883                mlog(ML_ERROR,
 884                     "cluster stack passed to mount (\"%s\") does not "
 885                     "match the filesystem (\"%s\")\n",
 886                     mopt->cluster_stack,
 887                     osb->osb_cluster_stack);
 888                return -EINVAL;
 889        }
 890
 891        return 0;
 892}
 893
 894static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
 895{
 896        int type;
 897        struct super_block *sb = osb->sb;
 898        unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 899                                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 900        int status = 0;
 901
 902        for (type = 0; type < MAXQUOTAS; type++) {
 903                if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 904                        continue;
 905                if (unsuspend)
 906                        status = dquot_resume(sb, type);
 907                else {
 908                        struct ocfs2_mem_dqinfo *oinfo;
 909
 910                        /* Cancel periodic syncing before suspending */
 911                        oinfo = sb_dqinfo(sb, type)->dqi_priv;
 912                        cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 913                        status = dquot_suspend(sb, type);
 914                }
 915                if (status < 0)
 916                        break;
 917        }
 918        if (status < 0)
 919                mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
 920                     "remount (error = %d).\n", status);
 921        return status;
 922}
 923
 924static int ocfs2_enable_quotas(struct ocfs2_super *osb)
 925{
 926        struct inode *inode[MAXQUOTAS] = { NULL, NULL };
 927        struct super_block *sb = osb->sb;
 928        unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 929                                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 930        unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 931                                        LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 932        int status;
 933        int type;
 934
 935        sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
 936        for (type = 0; type < MAXQUOTAS; type++) {
 937                if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 938                        continue;
 939                inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
 940                                                        osb->slot_num);
 941                if (!inode[type]) {
 942                        status = -ENOENT;
 943                        goto out_quota_off;
 944                }
 945                status = dquot_enable(inode[type], type, QFMT_OCFS2,
 946                                      DQUOT_USAGE_ENABLED);
 947                if (status < 0)
 948                        goto out_quota_off;
 949        }
 950
 951        for (type = 0; type < MAXQUOTAS; type++)
 952                iput(inode[type]);
 953        return 0;
 954out_quota_off:
 955        ocfs2_disable_quotas(osb);
 956        for (type = 0; type < MAXQUOTAS; type++)
 957                iput(inode[type]);
 958        mlog_errno(status);
 959        return status;
 960}
 961
 962static void ocfs2_disable_quotas(struct ocfs2_super *osb)
 963{
 964        int type;
 965        struct inode *inode;
 966        struct super_block *sb = osb->sb;
 967        struct ocfs2_mem_dqinfo *oinfo;
 968
 969        /* We mostly ignore errors in this function because there's not much
 970         * we can do when we see them */
 971        for (type = 0; type < MAXQUOTAS; type++) {
 972                if (!sb_has_quota_loaded(sb, type))
 973                        continue;
 974                /* Cancel periodic syncing before we grab dqonoff_mutex */
 975                oinfo = sb_dqinfo(sb, type)->dqi_priv;
 976                cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 977                inode = igrab(sb->s_dquot.files[type]);
 978                /* Turn off quotas. This will remove all dquot structures from
 979                 * memory and so they will be automatically synced to global
 980                 * quota files */
 981                dquot_disable(sb, type, DQUOT_USAGE_ENABLED |
 982                                        DQUOT_LIMITS_ENABLED);
 983                if (!inode)
 984                        continue;
 985                iput(inode);
 986        }
 987}
 988
 989/* Handle quota on quotactl */
 990static int ocfs2_quota_on(struct super_block *sb, int type, int format_id)
 991{
 992        unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 993                                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 994
 995        if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 996                return -EINVAL;
 997
 998        return dquot_enable(sb_dqopt(sb)->files[type], type,
 999                            format_id, DQUOT_LIMITS_ENABLED);
1000}
1001
1002/* Handle quota off quotactl */
1003static int ocfs2_quota_off(struct super_block *sb, int type)
1004{
1005        return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
1006}
1007
1008static const struct quotactl_ops ocfs2_quotactl_ops = {
1009        .quota_on_meta  = ocfs2_quota_on,
1010        .quota_off      = ocfs2_quota_off,
1011        .quota_sync     = dquot_quota_sync,
1012        .get_info       = dquot_get_dqinfo,
1013        .set_info       = dquot_set_dqinfo,
1014        .get_dqblk      = dquot_get_dqblk,
1015        .set_dqblk      = dquot_set_dqblk,
1016};
1017
1018static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
1019{
1020        struct dentry *root;
1021        int status, sector_size;
1022        struct mount_options parsed_options;
1023        struct inode *inode = NULL;
1024        struct ocfs2_super *osb = NULL;
1025        struct buffer_head *bh = NULL;
1026        char nodestr[8];
1027        struct ocfs2_blockcheck_stats stats;
1028
1029        trace_ocfs2_fill_super(sb, data, silent);
1030
1031        if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
1032                status = -EINVAL;
1033                goto read_super_error;
1034        }
1035
1036        /* probe for superblock */
1037        status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
1038        if (status < 0) {
1039                mlog(ML_ERROR, "superblock probe failed!\n");
1040                goto read_super_error;
1041        }
1042
1043        status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1044        osb = OCFS2_SB(sb);
1045        if (status < 0) {
1046                mlog_errno(status);
1047                goto read_super_error;
1048        }
1049        brelse(bh);
1050        bh = NULL;
1051
1052        if (!ocfs2_check_set_options(sb, &parsed_options)) {
1053                status = -EINVAL;
1054                goto read_super_error;
1055        }
1056        osb->s_mount_opt = parsed_options.mount_opt;
1057        osb->s_atime_quantum = parsed_options.atime_quantum;
1058        osb->preferred_slot = parsed_options.slot;
1059        osb->osb_commit_interval = parsed_options.commit_interval;
1060
1061        ocfs2_la_set_sizes(osb, parsed_options.localalloc_opt);
1062        osb->osb_resv_level = parsed_options.resv_level;
1063        osb->osb_dir_resv_level = parsed_options.resv_level;
1064        if (parsed_options.dir_resv_level == -1)
1065                osb->osb_dir_resv_level = parsed_options.resv_level;
1066        else
1067                osb->osb_dir_resv_level = parsed_options.dir_resv_level;
1068
1069        status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1070        if (status)
1071                goto read_super_error;
1072
1073        sb->s_magic = OCFS2_SUPER_MAGIC;
1074
1075        sb->s_flags = (sb->s_flags & ~(MS_POSIXACL | MS_NOSEC)) |
1076                ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1077
1078        /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1079         * heartbeat=none */
1080        if (bdev_read_only(sb->s_bdev)) {
1081                if (!(sb->s_flags & MS_RDONLY)) {
1082                        status = -EACCES;
1083                        mlog(ML_ERROR, "Readonly device detected but readonly "
1084                             "mount was not specified.\n");
1085                        goto read_super_error;
1086                }
1087
1088                /* You should not be able to start a local heartbeat
1089                 * on a readonly device. */
1090                if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1091                        status = -EROFS;
1092                        mlog(ML_ERROR, "Local heartbeat specified on readonly "
1093                             "device.\n");
1094                        goto read_super_error;
1095                }
1096
1097                status = ocfs2_check_journals_nolocks(osb);
1098                if (status < 0) {
1099                        if (status == -EROFS)
1100                                mlog(ML_ERROR, "Recovery required on readonly "
1101                                     "file system, but write access is "
1102                                     "unavailable.\n");
1103                        else
1104                                mlog_errno(status);
1105                        goto read_super_error;
1106                }
1107
1108                ocfs2_set_ro_flag(osb, 1);
1109
1110                printk(KERN_NOTICE "ocfs2: Readonly device (%s) detected. "
1111                       "Cluster services will not be used for this mount. "
1112                       "Recovery will be skipped.\n", osb->dev_str);
1113        }
1114
1115        if (!ocfs2_is_hard_readonly(osb)) {
1116                if (sb->s_flags & MS_RDONLY)
1117                        ocfs2_set_ro_flag(osb, 0);
1118        }
1119
1120        status = ocfs2_verify_heartbeat(osb);
1121        if (status < 0) {
1122                mlog_errno(status);
1123                goto read_super_error;
1124        }
1125
1126        osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1127                                                 ocfs2_debugfs_root);
1128        if (!osb->osb_debug_root) {
1129                status = -EINVAL;
1130                mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1131                goto read_super_error;
1132        }
1133
1134        osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1135                                            osb->osb_debug_root,
1136                                            osb,
1137                                            &ocfs2_osb_debug_fops);
1138        if (!osb->osb_ctxt) {
1139                status = -EINVAL;
1140                mlog_errno(status);
1141                goto read_super_error;
1142        }
1143
1144        if (ocfs2_meta_ecc(osb)) {
1145                status = ocfs2_blockcheck_stats_debugfs_install(
1146                                                &osb->osb_ecc_stats,
1147                                                osb->osb_debug_root);
1148                if (status) {
1149                        mlog(ML_ERROR,
1150                             "Unable to create blockcheck statistics "
1151                             "files\n");
1152                        goto read_super_error;
1153                }
1154        }
1155
1156        status = ocfs2_mount_volume(sb);
1157        if (status < 0)
1158                goto read_super_error;
1159
1160        if (osb->root_inode)
1161                inode = igrab(osb->root_inode);
1162
1163        if (!inode) {
1164                status = -EIO;
1165                mlog_errno(status);
1166                goto read_super_error;
1167        }
1168
1169        root = d_make_root(inode);
1170        if (!root) {
1171                status = -ENOMEM;
1172                mlog_errno(status);
1173                goto read_super_error;
1174        }
1175
1176        sb->s_root = root;
1177
1178        ocfs2_complete_mount_recovery(osb);
1179
1180        if (ocfs2_mount_local(osb))
1181                snprintf(nodestr, sizeof(nodestr), "local");
1182        else
1183                snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1184
1185        printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1186               "with %s data mode.\n",
1187               osb->dev_str, nodestr, osb->slot_num,
1188               osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1189               "ordered");
1190
1191        atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1192        wake_up(&osb->osb_mount_event);
1193
1194        /* Now we can initialize quotas because we can afford to wait
1195         * for cluster locks recovery now. That also means that truncation
1196         * log recovery can happen but that waits for proper quota setup */
1197        if (!(sb->s_flags & MS_RDONLY)) {
1198                status = ocfs2_enable_quotas(osb);
1199                if (status < 0) {
1200                        /* We have to err-out specially here because
1201                         * s_root is already set */
1202                        mlog_errno(status);
1203                        atomic_set(&osb->vol_state, VOLUME_DISABLED);
1204                        wake_up(&osb->osb_mount_event);
1205                        return status;
1206                }
1207        }
1208
1209        ocfs2_complete_quota_recovery(osb);
1210
1211        /* Now we wake up again for processes waiting for quotas */
1212        atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1213        wake_up(&osb->osb_mount_event);
1214
1215        /* Start this when the mount is almost sure of being successful */
1216        ocfs2_orphan_scan_start(osb);
1217
1218        return status;
1219
1220read_super_error:
1221        brelse(bh);
1222
1223        if (osb) {
1224                atomic_set(&osb->vol_state, VOLUME_DISABLED);
1225                wake_up(&osb->osb_mount_event);
1226                ocfs2_dismount_volume(sb, 1);
1227        }
1228
1229        if (status)
1230                mlog_errno(status);
1231        return status;
1232}
1233
1234static struct dentry *ocfs2_mount(struct file_system_type *fs_type,
1235                        int flags,
1236                        const char *dev_name,
1237                        void *data)
1238{
1239        return mount_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super);
1240}
1241
1242static void ocfs2_kill_sb(struct super_block *sb)
1243{
1244        struct ocfs2_super *osb = OCFS2_SB(sb);
1245
1246        /* Failed mount? */
1247        if (!osb || atomic_read(&osb->vol_state) == VOLUME_DISABLED)
1248                goto out;
1249
1250        /* Prevent further queueing of inode drop events */
1251        spin_lock(&dentry_list_lock);
1252        ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
1253        spin_unlock(&dentry_list_lock);
1254        /* Wait for work to finish and/or remove it */
1255        cancel_work_sync(&osb->dentry_lock_work);
1256out:
1257        kill_block_super(sb);
1258}
1259
1260static struct file_system_type ocfs2_fs_type = {
1261        .owner          = THIS_MODULE,
1262        .name           = "ocfs2",
1263        .mount          = ocfs2_mount,
1264        .kill_sb        = ocfs2_kill_sb,
1265
1266        .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1267        .next           = NULL
1268};
1269
1270static int ocfs2_check_set_options(struct super_block *sb,
1271                                   struct mount_options *options)
1272{
1273        if (options->mount_opt & OCFS2_MOUNT_USRQUOTA &&
1274            !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1275                                         OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1276                mlog(ML_ERROR, "User quotas were requested, but this "
1277                     "filesystem does not have the feature enabled.\n");
1278                return 0;
1279        }
1280        if (options->mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1281            !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1282                                         OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1283                mlog(ML_ERROR, "Group quotas were requested, but this "
1284                     "filesystem does not have the feature enabled.\n");
1285                return 0;
1286        }
1287        if (options->mount_opt & OCFS2_MOUNT_POSIX_ACL &&
1288            !OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR)) {
1289                mlog(ML_ERROR, "ACL support requested but extended attributes "
1290                     "feature is not enabled\n");
1291                return 0;
1292        }
1293        /* No ACL setting specified? Use XATTR feature... */
1294        if (!(options->mount_opt & (OCFS2_MOUNT_POSIX_ACL |
1295                                    OCFS2_MOUNT_NO_POSIX_ACL))) {
1296                if (OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR))
1297                        options->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1298                else
1299                        options->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1300        }
1301        return 1;
1302}
1303
1304static int ocfs2_parse_options(struct super_block *sb,
1305                               char *options,
1306                               struct mount_options *mopt,
1307                               int is_remount)
1308{
1309        int status, user_stack = 0;
1310        char *p;
1311        u32 tmp;
1312
1313        trace_ocfs2_parse_options(is_remount, options ? options : "(none)");
1314
1315        mopt->commit_interval = 0;
1316        mopt->mount_opt = OCFS2_MOUNT_NOINTR;
1317        mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1318        mopt->slot = OCFS2_INVALID_SLOT;
1319        mopt->localalloc_opt = -1;
1320        mopt->cluster_stack[0] = '\0';
1321        mopt->resv_level = OCFS2_DEFAULT_RESV_LEVEL;
1322        mopt->dir_resv_level = -1;
1323
1324        if (!options) {
1325                status = 1;
1326                goto bail;
1327        }
1328
1329        while ((p = strsep(&options, ",")) != NULL) {
1330                int token, option;
1331                substring_t args[MAX_OPT_ARGS];
1332
1333                if (!*p)
1334                        continue;
1335
1336                token = match_token(p, tokens, args);
1337                switch (token) {
1338                case Opt_hb_local:
1339                        mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1340                        break;
1341                case Opt_hb_none:
1342                        mopt->mount_opt |= OCFS2_MOUNT_HB_NONE;
1343                        break;
1344                case Opt_hb_global:
1345                        mopt->mount_opt |= OCFS2_MOUNT_HB_GLOBAL;
1346                        break;
1347                case Opt_barrier:
1348                        if (match_int(&args[0], &option)) {
1349                                status = 0;
1350                                goto bail;
1351                        }
1352                        if (option)
1353                                mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1354                        else
1355                                mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1356                        break;
1357                case Opt_intr:
1358                        mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1359                        break;
1360                case Opt_nointr:
1361                        mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1362                        break;
1363                case Opt_err_panic:
1364                        mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1365                        break;
1366                case Opt_err_ro:
1367                        mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1368                        break;
1369                case Opt_data_ordered:
1370                        mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1371                        break;
1372                case Opt_data_writeback:
1373                        mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1374                        break;
1375                case Opt_user_xattr:
1376                        mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1377                        break;
1378                case Opt_nouser_xattr:
1379                        mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1380                        break;
1381                case Opt_atime_quantum:
1382                        if (match_int(&args[0], &option)) {
1383                                status = 0;
1384                                goto bail;
1385                        }
1386                        if (option >= 0)
1387                                mopt->atime_quantum = option;
1388                        break;
1389                case Opt_slot:
1390                        option = 0;
1391                        if (match_int(&args[0], &option)) {
1392                                status = 0;
1393                                goto bail;
1394                        }
1395                        if (option)
1396                                mopt->slot = (s16)option;
1397                        break;
1398                case Opt_commit:
1399                        option = 0;
1400                        if (match_int(&args[0], &option)) {
1401                                status = 0;
1402                                goto bail;
1403                        }
1404                        if (option < 0)
1405                                return 0;
1406                        if (option == 0)
1407                                option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1408                        mopt->commit_interval = HZ * option;
1409                        break;
1410                case Opt_localalloc:
1411                        option = 0;
1412                        if (match_int(&args[0], &option)) {
1413                                status = 0;
1414                                goto bail;
1415                        }
1416                        if (option >= 0)
1417                                mopt->localalloc_opt = option;
1418                        break;
1419                case Opt_localflocks:
1420                        /*
1421                         * Changing this during remount could race
1422                         * flock() requests, or "unbalance" existing
1423                         * ones (e.g., a lock is taken in one mode but
1424                         * dropped in the other). If users care enough
1425                         * to flip locking modes during remount, we
1426                         * could add a "local" flag to individual
1427                         * flock structures for proper tracking of
1428                         * state.
1429                         */
1430                        if (!is_remount)
1431                                mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1432                        break;
1433                case Opt_stack:
1434                        /* Check both that the option we were passed
1435                         * is of the right length and that it is a proper
1436                         * string of the right length.
1437                         */
1438                        if (((args[0].to - args[0].from) !=
1439                             OCFS2_STACK_LABEL_LEN) ||
1440                            (strnlen(args[0].from,
1441                                     OCFS2_STACK_LABEL_LEN) !=
1442                             OCFS2_STACK_LABEL_LEN)) {
1443                                mlog(ML_ERROR,
1444                                     "Invalid cluster_stack option\n");
1445                                status = 0;
1446                                goto bail;
1447                        }
1448                        memcpy(mopt->cluster_stack, args[0].from,
1449                               OCFS2_STACK_LABEL_LEN);
1450                        mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1451                        /*
1452                         * Open code the memcmp here as we don't have
1453                         * an osb to pass to
1454                         * ocfs2_userspace_stack().
1455                         */
1456                        if (memcmp(mopt->cluster_stack,
1457                                   OCFS2_CLASSIC_CLUSTER_STACK,
1458                                   OCFS2_STACK_LABEL_LEN))
1459                                user_stack = 1;
1460                        break;
1461                case Opt_inode64:
1462                        mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1463                        break;
1464                case Opt_usrquota:
1465                        mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1466                        break;
1467                case Opt_grpquota:
1468                        mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1469                        break;
1470                case Opt_coherency_buffered:
1471                        mopt->mount_opt |= OCFS2_MOUNT_COHERENCY_BUFFERED;
1472                        break;
1473                case Opt_coherency_full:
1474                        mopt->mount_opt &= ~OCFS2_MOUNT_COHERENCY_BUFFERED;
1475                        break;
1476                case Opt_acl:
1477                        mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1478                        mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
1479                        break;
1480                case Opt_noacl:
1481                        mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1482                        mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1483                        break;
1484                case Opt_resv_level:
1485                        if (is_remount)
1486                                break;
1487                        if (match_int(&args[0], &option)) {
1488                                status = 0;
1489                                goto bail;
1490                        }
1491                        if (option >= OCFS2_MIN_RESV_LEVEL &&
1492                            option < OCFS2_MAX_RESV_LEVEL)
1493                                mopt->resv_level = option;
1494                        break;
1495                case Opt_dir_resv_level:
1496                        if (is_remount)
1497                                break;
1498                        if (match_int(&args[0], &option)) {
1499                                status = 0;
1500                                goto bail;
1501                        }
1502                        if (option >= OCFS2_MIN_RESV_LEVEL &&
1503                            option < OCFS2_MAX_RESV_LEVEL)
1504                                mopt->dir_resv_level = option;
1505                        break;
1506                default:
1507                        mlog(ML_ERROR,
1508                             "Unrecognized mount option \"%s\" "
1509                             "or missing value\n", p);
1510                        status = 0;
1511                        goto bail;
1512                }
1513        }
1514
1515        if (user_stack == 0) {
1516                /* Ensure only one heartbeat mode */
1517                tmp = mopt->mount_opt & (OCFS2_MOUNT_HB_LOCAL |
1518                                         OCFS2_MOUNT_HB_GLOBAL |
1519                                         OCFS2_MOUNT_HB_NONE);
1520                if (hweight32(tmp) != 1) {
1521                        mlog(ML_ERROR, "Invalid heartbeat mount options\n");
1522                        status = 0;
1523                        goto bail;
1524                }
1525        }
1526
1527        status = 1;
1528
1529bail:
1530        return status;
1531}
1532
1533static int ocfs2_show_options(struct seq_file *s, struct dentry *root)
1534{
1535        struct ocfs2_super *osb = OCFS2_SB(root->d_sb);
1536        unsigned long opts = osb->s_mount_opt;
1537        unsigned int local_alloc_megs;
1538
1539        if (opts & (OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL)) {
1540                seq_printf(s, ",_netdev");
1541                if (opts & OCFS2_MOUNT_HB_LOCAL)
1542                        seq_printf(s, ",%s", OCFS2_HB_LOCAL);
1543                else
1544                        seq_printf(s, ",%s", OCFS2_HB_GLOBAL);
1545        } else
1546                seq_printf(s, ",%s", OCFS2_HB_NONE);
1547
1548        if (opts & OCFS2_MOUNT_NOINTR)
1549                seq_printf(s, ",nointr");
1550
1551        if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1552                seq_printf(s, ",data=writeback");
1553        else
1554                seq_printf(s, ",data=ordered");
1555
1556        if (opts & OCFS2_MOUNT_BARRIER)
1557                seq_printf(s, ",barrier=1");
1558
1559        if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1560                seq_printf(s, ",errors=panic");
1561        else
1562                seq_printf(s, ",errors=remount-ro");
1563
1564        if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1565                seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1566
1567        seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1568
1569        if (osb->osb_commit_interval)
1570                seq_printf(s, ",commit=%u",
1571                           (unsigned) (osb->osb_commit_interval / HZ));
1572
1573        local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1574        if (local_alloc_megs != ocfs2_la_default_mb(osb))
1575                seq_printf(s, ",localalloc=%d", local_alloc_megs);
1576
1577        if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1578                seq_printf(s, ",localflocks,");
1579
1580        if (osb->osb_cluster_stack[0])
1581                seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1582                           osb->osb_cluster_stack);
1583        if (opts & OCFS2_MOUNT_USRQUOTA)
1584                seq_printf(s, ",usrquota");
1585        if (opts & OCFS2_MOUNT_GRPQUOTA)
1586                seq_printf(s, ",grpquota");
1587
1588        if (opts & OCFS2_MOUNT_COHERENCY_BUFFERED)
1589                seq_printf(s, ",coherency=buffered");
1590        else
1591                seq_printf(s, ",coherency=full");
1592
1593        if (opts & OCFS2_MOUNT_NOUSERXATTR)
1594                seq_printf(s, ",nouser_xattr");
1595        else
1596                seq_printf(s, ",user_xattr");
1597
1598        if (opts & OCFS2_MOUNT_INODE64)
1599                seq_printf(s, ",inode64");
1600
1601        if (opts & OCFS2_MOUNT_POSIX_ACL)
1602                seq_printf(s, ",acl");
1603        else
1604                seq_printf(s, ",noacl");
1605
1606        if (osb->osb_resv_level != OCFS2_DEFAULT_RESV_LEVEL)
1607                seq_printf(s, ",resv_level=%d", osb->osb_resv_level);
1608
1609        if (osb->osb_dir_resv_level != osb->osb_resv_level)
1610                seq_printf(s, ",dir_resv_level=%d", osb->osb_resv_level);
1611
1612        return 0;
1613}
1614
1615wait_queue_head_t ocfs2__ioend_wq[OCFS2_IOEND_WQ_HASH_SZ];
1616
1617static int __init ocfs2_init(void)
1618{
1619        int status, i;
1620
1621        ocfs2_print_version();
1622
1623        for (i = 0; i < OCFS2_IOEND_WQ_HASH_SZ; i++)
1624                init_waitqueue_head(&ocfs2__ioend_wq[i]);
1625
1626        status = init_ocfs2_uptodate_cache();
1627        if (status < 0)
1628                goto out1;
1629
1630        status = ocfs2_initialize_mem_caches();
1631        if (status < 0)
1632                goto out2;
1633
1634        ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1635        if (!ocfs2_wq) {
1636                status = -ENOMEM;
1637                goto out3;
1638        }
1639
1640        ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1641        if (!ocfs2_debugfs_root) {
1642                status = -EFAULT;
1643                mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1644        }
1645
1646        ocfs2_set_locking_protocol();
1647
1648        status = register_quota_format(&ocfs2_quota_format);
1649        if (status < 0)
1650                goto out4;
1651        status = register_filesystem(&ocfs2_fs_type);
1652        if (!status)
1653                return 0;
1654
1655        unregister_quota_format(&ocfs2_quota_format);
1656out4:
1657        destroy_workqueue(ocfs2_wq);
1658        debugfs_remove(ocfs2_debugfs_root);
1659out3:
1660        ocfs2_free_mem_caches();
1661out2:
1662        exit_ocfs2_uptodate_cache();
1663out1:
1664        mlog_errno(status);
1665        return status;
1666}
1667
1668static void __exit ocfs2_exit(void)
1669{
1670        if (ocfs2_wq) {
1671                flush_workqueue(ocfs2_wq);
1672                destroy_workqueue(ocfs2_wq);
1673        }
1674
1675        unregister_quota_format(&ocfs2_quota_format);
1676
1677        debugfs_remove(ocfs2_debugfs_root);
1678
1679        ocfs2_free_mem_caches();
1680
1681        unregister_filesystem(&ocfs2_fs_type);
1682
1683        exit_ocfs2_uptodate_cache();
1684}
1685
1686static void ocfs2_put_super(struct super_block *sb)
1687{
1688        trace_ocfs2_put_super(sb);
1689
1690        ocfs2_sync_blockdev(sb);
1691        ocfs2_dismount_volume(sb, 0);
1692}
1693
1694static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1695{
1696        struct ocfs2_super *osb;
1697        u32 numbits, freebits;
1698        int status;
1699        struct ocfs2_dinode *bm_lock;
1700        struct buffer_head *bh = NULL;
1701        struct inode *inode = NULL;
1702
1703        trace_ocfs2_statfs(dentry->d_sb, buf);
1704
1705        osb = OCFS2_SB(dentry->d_sb);
1706
1707        inode = ocfs2_get_system_file_inode(osb,
1708                                            GLOBAL_BITMAP_SYSTEM_INODE,
1709                                            OCFS2_INVALID_SLOT);
1710        if (!inode) {
1711                mlog(ML_ERROR, "failed to get bitmap inode\n");
1712                status = -EIO;
1713                goto bail;
1714        }
1715
1716        status = ocfs2_inode_lock(inode, &bh, 0);
1717        if (status < 0) {
1718                mlog_errno(status);
1719                goto bail;
1720        }
1721
1722        bm_lock = (struct ocfs2_dinode *) bh->b_data;
1723
1724        numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1725        freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1726
1727        buf->f_type = OCFS2_SUPER_MAGIC;
1728        buf->f_bsize = dentry->d_sb->s_blocksize;
1729        buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1730        buf->f_blocks = ((sector_t) numbits) *
1731                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1732        buf->f_bfree = ((sector_t) freebits) *
1733                       (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1734        buf->f_bavail = buf->f_bfree;
1735        buf->f_files = numbits;
1736        buf->f_ffree = freebits;
1737        buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
1738                                & 0xFFFFFFFFUL;
1739        buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
1740                                OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
1741
1742        brelse(bh);
1743
1744        ocfs2_inode_unlock(inode, 0);
1745        status = 0;
1746bail:
1747        if (inode)
1748                iput(inode);
1749
1750        if (status)
1751                mlog_errno(status);
1752
1753        return status;
1754}
1755
1756static void ocfs2_inode_init_once(void *data)
1757{
1758        struct ocfs2_inode_info *oi = data;
1759
1760        oi->ip_flags = 0;
1761        oi->ip_open_count = 0;
1762        spin_lock_init(&oi->ip_lock);
1763        ocfs2_extent_map_init(&oi->vfs_inode);
1764        INIT_LIST_HEAD(&oi->ip_io_markers);
1765        oi->ip_dir_start_lookup = 0;
1766        atomic_set(&oi->ip_unaligned_aio, 0);
1767        init_rwsem(&oi->ip_alloc_sem);
1768        init_rwsem(&oi->ip_xattr_sem);
1769        mutex_init(&oi->ip_io_mutex);
1770
1771        oi->ip_blkno = 0ULL;
1772        oi->ip_clusters = 0;
1773
1774        ocfs2_resv_init_once(&oi->ip_la_data_resv);
1775
1776        ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1777        ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1778        ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1779
1780        ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1781                                  &ocfs2_inode_caching_ops);
1782
1783        inode_init_once(&oi->vfs_inode);
1784}
1785
1786static int ocfs2_initialize_mem_caches(void)
1787{
1788        ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1789                                       sizeof(struct ocfs2_inode_info),
1790                                       0,
1791                                       (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1792                                                SLAB_MEM_SPREAD),
1793                                       ocfs2_inode_init_once);
1794        ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1795                                        sizeof(struct ocfs2_dquot),
1796                                        0,
1797                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1798                                                SLAB_MEM_SPREAD),
1799                                        NULL);
1800        ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1801                                        sizeof(struct ocfs2_quota_chunk),
1802                                        0,
1803                                        (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1804                                        NULL);
1805        if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1806            !ocfs2_qf_chunk_cachep) {
1807                if (ocfs2_inode_cachep)
1808                        kmem_cache_destroy(ocfs2_inode_cachep);
1809                if (ocfs2_dquot_cachep)
1810                        kmem_cache_destroy(ocfs2_dquot_cachep);
1811                if (ocfs2_qf_chunk_cachep)
1812                        kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1813                return -ENOMEM;
1814        }
1815
1816        return 0;
1817}
1818
1819static void ocfs2_free_mem_caches(void)
1820{
1821        if (ocfs2_inode_cachep)
1822                kmem_cache_destroy(ocfs2_inode_cachep);
1823        ocfs2_inode_cachep = NULL;
1824
1825        if (ocfs2_dquot_cachep)
1826                kmem_cache_destroy(ocfs2_dquot_cachep);
1827        ocfs2_dquot_cachep = NULL;
1828
1829        if (ocfs2_qf_chunk_cachep)
1830                kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1831        ocfs2_qf_chunk_cachep = NULL;
1832}
1833
1834static int ocfs2_get_sector(struct super_block *sb,
1835                            struct buffer_head **bh,
1836                            int block,
1837                            int sect_size)
1838{
1839        if (!sb_set_blocksize(sb, sect_size)) {
1840                mlog(ML_ERROR, "unable to set blocksize\n");
1841                return -EIO;
1842        }
1843
1844        *bh = sb_getblk(sb, block);
1845        if (!*bh) {
1846                mlog_errno(-EIO);
1847                return -EIO;
1848        }
1849        lock_buffer(*bh);
1850        if (!buffer_dirty(*bh))
1851                clear_buffer_uptodate(*bh);
1852        unlock_buffer(*bh);
1853        ll_rw_block(READ, 1, bh);
1854        wait_on_buffer(*bh);
1855        if (!buffer_uptodate(*bh)) {
1856                mlog_errno(-EIO);
1857                brelse(*bh);
1858                *bh = NULL;
1859                return -EIO;
1860        }
1861
1862        return 0;
1863}
1864
1865static int ocfs2_mount_volume(struct super_block *sb)
1866{
1867        int status = 0;
1868        int unlock_super = 0;
1869        struct ocfs2_super *osb = OCFS2_SB(sb);
1870
1871        if (ocfs2_is_hard_readonly(osb))
1872                goto leave;
1873
1874        status = ocfs2_dlm_init(osb);
1875        if (status < 0) {
1876                mlog_errno(status);
1877                goto leave;
1878        }
1879
1880        status = ocfs2_super_lock(osb, 1);
1881        if (status < 0) {
1882                mlog_errno(status);
1883                goto leave;
1884        }
1885        unlock_super = 1;
1886
1887        /* This will load up the node map and add ourselves to it. */
1888        status = ocfs2_find_slot(osb);
1889        if (status < 0) {
1890                mlog_errno(status);
1891                goto leave;
1892        }
1893
1894        /* load all node-local system inodes */
1895        status = ocfs2_init_local_system_inodes(osb);
1896        if (status < 0) {
1897                mlog_errno(status);
1898                goto leave;
1899        }
1900
1901        status = ocfs2_check_volume(osb);
1902        if (status < 0) {
1903                mlog_errno(status);
1904                goto leave;
1905        }
1906
1907        status = ocfs2_truncate_log_init(osb);
1908        if (status < 0)
1909                mlog_errno(status);
1910
1911leave:
1912        if (unlock_super)
1913                ocfs2_super_unlock(osb, 1);
1914
1915        return status;
1916}
1917
1918static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1919{
1920        int tmp, hangup_needed = 0;
1921        struct ocfs2_super *osb = NULL;
1922        char nodestr[8];
1923
1924        trace_ocfs2_dismount_volume(sb);
1925
1926        BUG_ON(!sb);
1927        osb = OCFS2_SB(sb);
1928        BUG_ON(!osb);
1929
1930        debugfs_remove(osb->osb_ctxt);
1931
1932        /*
1933         * Flush inode dropping work queue so that deletes are
1934         * performed while the filesystem is still working
1935         */
1936        ocfs2_drop_all_dl_inodes(osb);
1937
1938        /* Orphan scan should be stopped as early as possible */
1939        ocfs2_orphan_scan_stop(osb);
1940
1941        ocfs2_disable_quotas(osb);
1942
1943        ocfs2_shutdown_local_alloc(osb);
1944
1945        ocfs2_truncate_log_shutdown(osb);
1946
1947        /* This will disable recovery and flush any recovery work. */
1948        ocfs2_recovery_exit(osb);
1949
1950        ocfs2_journal_shutdown(osb);
1951
1952        ocfs2_sync_blockdev(sb);
1953
1954        ocfs2_purge_refcount_trees(osb);
1955
1956        /* No cluster connection means we've failed during mount, so skip
1957         * all the steps which depended on that to complete. */
1958        if (osb->cconn) {
1959                tmp = ocfs2_super_lock(osb, 1);
1960                if (tmp < 0) {
1961                        mlog_errno(tmp);
1962                        return;
1963                }
1964        }
1965
1966        if (osb->slot_num != OCFS2_INVALID_SLOT)
1967                ocfs2_put_slot(osb);
1968
1969        if (osb->cconn)
1970                ocfs2_super_unlock(osb, 1);
1971
1972        ocfs2_release_system_inodes(osb);
1973
1974        /*
1975         * If we're dismounting due to mount error, mount.ocfs2 will clean
1976         * up heartbeat.  If we're a local mount, there is no heartbeat.
1977         * If we failed before we got a uuid_str yet, we can't stop
1978         * heartbeat.  Otherwise, do it.
1979         */
1980        if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str &&
1981            !ocfs2_is_hard_readonly(osb))
1982                hangup_needed = 1;
1983
1984        if (osb->cconn)
1985                ocfs2_dlm_shutdown(osb, hangup_needed);
1986
1987        ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1988        debugfs_remove(osb->osb_debug_root);
1989
1990        if (hangup_needed)
1991                ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1992
1993        atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1994
1995        if (ocfs2_mount_local(osb))
1996                snprintf(nodestr, sizeof(nodestr), "local");
1997        else
1998                snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1999
2000        printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
2001               osb->dev_str, nodestr);
2002
2003        ocfs2_delete_osb(osb);
2004        kfree(osb);
2005        sb->s_dev = 0;
2006        sb->s_fs_info = NULL;
2007}
2008
2009static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
2010                                unsigned uuid_bytes)
2011{
2012        int i, ret;
2013        char *ptr;
2014
2015        BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
2016
2017        osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
2018        if (osb->uuid_str == NULL)
2019                return -ENOMEM;
2020
2021        for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
2022                /* print with null */
2023                ret = snprintf(ptr, 3, "%02X", uuid[i]);
2024                if (ret != 2) /* drop super cleans up */
2025                        return -EINVAL;
2026                /* then only advance past the last char */
2027                ptr += 2;
2028        }
2029
2030        return 0;
2031}
2032
2033/* Make sure entire volume is addressable by our journal.  Requires
2034   osb_clusters_at_boot to be valid and for the journal to have been
2035   initialized by ocfs2_journal_init(). */
2036static int ocfs2_journal_addressable(struct ocfs2_super *osb)
2037{
2038        int status = 0;
2039        u64 max_block =
2040                ocfs2_clusters_to_blocks(osb->sb,
2041                                         osb->osb_clusters_at_boot) - 1;
2042
2043        /* 32-bit block number is always OK. */
2044        if (max_block <= (u32)~0ULL)
2045                goto out;
2046
2047        /* Volume is "huge", so see if our journal is new enough to
2048           support it. */
2049        if (!(OCFS2_HAS_COMPAT_FEATURE(osb->sb,
2050                                       OCFS2_FEATURE_COMPAT_JBD2_SB) &&
2051              jbd2_journal_check_used_features(osb->journal->j_journal, 0, 0,
2052                                               JBD2_FEATURE_INCOMPAT_64BIT))) {
2053                mlog(ML_ERROR, "The journal cannot address the entire volume. "
2054                     "Enable the 'block64' journal option with tunefs.ocfs2");
2055                status = -EFBIG;
2056                goto out;
2057        }
2058
2059 out:
2060        return status;
2061}
2062
2063static int ocfs2_initialize_super(struct super_block *sb,
2064                                  struct buffer_head *bh,
2065                                  int sector_size,
2066                                  struct ocfs2_blockcheck_stats *stats)
2067{
2068        int status;
2069        int i, cbits, bbits;
2070        struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2071        struct inode *inode = NULL;
2072        struct ocfs2_journal *journal;
2073        __le32 uuid_net_key;
2074        struct ocfs2_super *osb;
2075        u64 total_blocks;
2076
2077        osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
2078        if (!osb) {
2079                status = -ENOMEM;
2080                mlog_errno(status);
2081                goto bail;
2082        }
2083
2084        sb->s_fs_info = osb;
2085        sb->s_op = &ocfs2_sops;
2086        sb->s_d_op = &ocfs2_dentry_ops;
2087        sb->s_export_op = &ocfs2_export_ops;
2088        sb->s_qcop = &ocfs2_quotactl_ops;
2089        sb->dq_op = &ocfs2_quota_operations;
2090        sb->s_xattr = ocfs2_xattr_handlers;
2091        sb->s_time_gran = 1;
2092        sb->s_flags |= MS_NOATIME;
2093        /* this is needed to support O_LARGEFILE */
2094        cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2095        bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
2096        sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
2097
2098        osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
2099
2100        for (i = 0; i < 3; i++)
2101                osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
2102        osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2103
2104        osb->sb = sb;
2105        /* Save off for ocfs2_rw_direct */
2106        osb->s_sectsize_bits = blksize_bits(sector_size);
2107        BUG_ON(!osb->s_sectsize_bits);
2108
2109        spin_lock_init(&osb->dc_task_lock);
2110        init_waitqueue_head(&osb->dc_event);
2111        osb->dc_work_sequence = 0;
2112        osb->dc_wake_sequence = 0;
2113        INIT_LIST_HEAD(&osb->blocked_lock_list);
2114        osb->blocked_lock_count = 0;
2115        spin_lock_init(&osb->osb_lock);
2116        spin_lock_init(&osb->osb_xattr_lock);
2117        ocfs2_init_steal_slots(osb);
2118
2119        atomic_set(&osb->alloc_stats.moves, 0);
2120        atomic_set(&osb->alloc_stats.local_data, 0);
2121        atomic_set(&osb->alloc_stats.bitmap_data, 0);
2122        atomic_set(&osb->alloc_stats.bg_allocs, 0);
2123        atomic_set(&osb->alloc_stats.bg_extends, 0);
2124
2125        /* Copy the blockcheck stats from the superblock probe */
2126        osb->osb_ecc_stats = *stats;
2127
2128        ocfs2_init_node_maps(osb);
2129
2130        snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2131                 MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2132
2133        osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2134        if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2135                mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2136                     osb->max_slots);
2137                status = -EINVAL;
2138                goto bail;
2139        }
2140
2141        ocfs2_orphan_scan_init(osb);
2142
2143        status = ocfs2_recovery_init(osb);
2144        if (status) {
2145                mlog(ML_ERROR, "Unable to initialize recovery state\n");
2146                mlog_errno(status);
2147                goto bail;
2148        }
2149
2150        init_waitqueue_head(&osb->checkpoint_event);
2151        atomic_set(&osb->needs_checkpoint, 0);
2152
2153        osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2154
2155        osb->slot_num = OCFS2_INVALID_SLOT;
2156
2157        osb->s_xattr_inline_size = le16_to_cpu(
2158                                        di->id2.i_super.s_xattr_inline_size);
2159
2160        osb->local_alloc_state = OCFS2_LA_UNUSED;
2161        osb->local_alloc_bh = NULL;
2162        INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2163
2164        init_waitqueue_head(&osb->osb_mount_event);
2165
2166        status = ocfs2_resmap_init(osb, &osb->osb_la_resmap);
2167        if (status) {
2168                mlog_errno(status);
2169                goto bail;
2170        }
2171
2172        osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2173        if (!osb->vol_label) {
2174                mlog(ML_ERROR, "unable to alloc vol label\n");
2175                status = -ENOMEM;
2176                goto bail;
2177        }
2178
2179        osb->slot_recovery_generations =
2180                kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2181                        GFP_KERNEL);
2182        if (!osb->slot_recovery_generations) {
2183                status = -ENOMEM;
2184                mlog_errno(status);
2185                goto bail;
2186        }
2187
2188        init_waitqueue_head(&osb->osb_wipe_event);
2189        osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2190                                        sizeof(*osb->osb_orphan_wipes),
2191                                        GFP_KERNEL);
2192        if (!osb->osb_orphan_wipes) {
2193                status = -ENOMEM;
2194                mlog_errno(status);
2195                goto bail;
2196        }
2197
2198        osb->osb_rf_lock_tree = RB_ROOT;
2199
2200        osb->s_feature_compat =
2201                le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2202        osb->s_feature_ro_compat =
2203                le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2204        osb->s_feature_incompat =
2205                le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2206
2207        if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2208                mlog(ML_ERROR, "couldn't mount because of unsupported "
2209                     "optional features (%x).\n", i);
2210                status = -EINVAL;
2211                goto bail;
2212        }
2213        if (!(osb->sb->s_flags & MS_RDONLY) &&
2214            (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2215                mlog(ML_ERROR, "couldn't mount RDWR because of "
2216                     "unsupported optional features (%x).\n", i);
2217                status = -EINVAL;
2218                goto bail;
2219        }
2220
2221        if (ocfs2_clusterinfo_valid(osb)) {
2222                osb->osb_stackflags =
2223                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stackflags;
2224                memcpy(osb->osb_cluster_stack,
2225                       OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2226                       OCFS2_STACK_LABEL_LEN);
2227                osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2228                if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2229                        mlog(ML_ERROR,
2230                             "couldn't mount because of an invalid "
2231                             "cluster stack label (%s) \n",
2232                             osb->osb_cluster_stack);
2233                        status = -EINVAL;
2234                        goto bail;
2235                }
2236        } else {
2237                /* The empty string is identical with classic tools that
2238                 * don't know about s_cluster_info. */
2239                osb->osb_cluster_stack[0] = '\0';
2240        }
2241
2242        get_random_bytes(&osb->s_next_generation, sizeof(u32));
2243
2244        /* FIXME
2245         * This should be done in ocfs2_journal_init(), but unknown
2246         * ordering issues will cause the filesystem to crash.
2247         * If anyone wants to figure out what part of the code
2248         * refers to osb->journal before ocfs2_journal_init() is run,
2249         * be my guest.
2250         */
2251        /* initialize our journal structure */
2252
2253        journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2254        if (!journal) {
2255                mlog(ML_ERROR, "unable to alloc journal\n");
2256                status = -ENOMEM;
2257                goto bail;
2258        }
2259        osb->journal = journal;
2260        journal->j_osb = osb;
2261
2262        atomic_set(&journal->j_num_trans, 0);
2263        init_rwsem(&journal->j_trans_barrier);
2264        init_waitqueue_head(&journal->j_checkpointed);
2265        spin_lock_init(&journal->j_lock);
2266        journal->j_trans_id = (unsigned long) 1;
2267        INIT_LIST_HEAD(&journal->j_la_cleanups);
2268        INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2269        journal->j_state = OCFS2_JOURNAL_FREE;
2270
2271        INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2272        osb->dentry_lock_list = NULL;
2273
2274        /* get some pseudo constants for clustersize bits */
2275        osb->s_clustersize_bits =
2276                le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2277        osb->s_clustersize = 1 << osb->s_clustersize_bits;
2278
2279        if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2280            osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2281                mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2282                     osb->s_clustersize);
2283                status = -EINVAL;
2284                goto bail;
2285        }
2286
2287        total_blocks = ocfs2_clusters_to_blocks(osb->sb,
2288                                                le32_to_cpu(di->i_clusters));
2289
2290        status = generic_check_addressable(osb->sb->s_blocksize_bits,
2291                                           total_blocks);
2292        if (status) {
2293                mlog(ML_ERROR, "Volume too large "
2294                     "to mount safely on this system");
2295                status = -EFBIG;
2296                goto bail;
2297        }
2298
2299        if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2300                                 sizeof(di->id2.i_super.s_uuid))) {
2301                mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2302                status = -ENOMEM;
2303                goto bail;
2304        }
2305
2306        memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2307
2308        strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2309        osb->vol_label[63] = '\0';
2310        osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2311        osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2312        osb->first_cluster_group_blkno =
2313                le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2314        osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2315        osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2316        trace_ocfs2_initialize_super(osb->vol_label, osb->uuid_str,
2317                                     (unsigned long long)osb->root_blkno,
2318                                     (unsigned long long)osb->system_dir_blkno,
2319                                     osb->s_clustersize_bits);
2320
2321        osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2322        if (!osb->osb_dlm_debug) {
2323                status = -ENOMEM;
2324                mlog_errno(status);
2325                goto bail;
2326        }
2327
2328        atomic_set(&osb->vol_state, VOLUME_INIT);
2329
2330        /* load root, system_dir, and all global system inodes */
2331        status = ocfs2_init_global_system_inodes(osb);
2332        if (status < 0) {
2333                mlog_errno(status);
2334                goto bail;
2335        }
2336
2337        /*
2338         * global bitmap
2339         */
2340        inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2341                                            OCFS2_INVALID_SLOT);
2342        if (!inode) {
2343                status = -EINVAL;
2344                mlog_errno(status);
2345                goto bail;
2346        }
2347
2348        osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2349        osb->osb_clusters_at_boot = OCFS2_I(inode)->ip_clusters;
2350        iput(inode);
2351
2352        osb->bitmap_cpg = ocfs2_group_bitmap_size(sb, 0,
2353                                 osb->s_feature_incompat) * 8;
2354
2355        status = ocfs2_init_slot_info(osb);
2356        if (status < 0) {
2357                mlog_errno(status);
2358                goto bail;
2359        }
2360        cleancache_init_shared_fs((char *)&di->id2.i_super.s_uuid, sb);
2361
2362bail:
2363        return status;
2364}
2365
2366/*
2367 * will return: -EAGAIN if it is ok to keep searching for superblocks
2368 *              -EINVAL if there is a bad superblock
2369 *              0 on success
2370 */
2371static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2372                               struct buffer_head *bh,
2373                               u32 blksz,
2374                               struct ocfs2_blockcheck_stats *stats)
2375{
2376        int status = -EAGAIN;
2377
2378        if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2379                   strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2380                /* We have to do a raw check of the feature here */
2381                if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2382                    OCFS2_FEATURE_INCOMPAT_META_ECC) {
2383                        status = ocfs2_block_check_validate(bh->b_data,
2384                                                            bh->b_size,
2385                                                            &di->i_check,
2386                                                            stats);
2387                        if (status)
2388                                goto out;
2389                }
2390                status = -EINVAL;
2391                if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2392                        mlog(ML_ERROR, "found superblock with incorrect block "
2393                             "size: found %u, should be %u\n",
2394                             1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2395                               blksz);
2396                } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2397                           OCFS2_MAJOR_REV_LEVEL ||
2398                           le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2399                           OCFS2_MINOR_REV_LEVEL) {
2400                        mlog(ML_ERROR, "found superblock with bad version: "
2401                             "found %u.%u, should be %u.%u\n",
2402                             le16_to_cpu(di->id2.i_super.s_major_rev_level),
2403                             le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2404                             OCFS2_MAJOR_REV_LEVEL,
2405                             OCFS2_MINOR_REV_LEVEL);
2406                } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2407                        mlog(ML_ERROR, "bad block number on superblock: "
2408                             "found %llu, should be %llu\n",
2409                             (unsigned long long)le64_to_cpu(di->i_blkno),
2410                             (unsigned long long)bh->b_blocknr);
2411                } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2412                            le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2413                        mlog(ML_ERROR, "bad cluster size found: %u\n",
2414                             1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2415                } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2416                        mlog(ML_ERROR, "bad root_blkno: 0\n");
2417                } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2418                        mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2419                } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2420                        mlog(ML_ERROR,
2421                             "Superblock slots found greater than file system "
2422                             "maximum: found %u, max %u\n",
2423                             le16_to_cpu(di->id2.i_super.s_max_slots),
2424                             OCFS2_MAX_SLOTS);
2425                } else {
2426                        /* found it! */
2427                        status = 0;
2428                }
2429        }
2430
2431out:
2432        if (status && status != -EAGAIN)
2433                mlog_errno(status);
2434        return status;
2435}
2436
2437static int ocfs2_check_volume(struct ocfs2_super *osb)
2438{
2439        int status;
2440        int dirty;
2441        int local;
2442        struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2443                                                  * recover
2444                                                  * ourselves. */
2445
2446        /* Init our journal object. */
2447        status = ocfs2_journal_init(osb->journal, &dirty);
2448        if (status < 0) {
2449                mlog(ML_ERROR, "Could not initialize journal!\n");
2450                goto finally;
2451        }
2452
2453        /* Now that journal has been initialized, check to make sure
2454           entire volume is addressable. */
2455        status = ocfs2_journal_addressable(osb);
2456        if (status)
2457                goto finally;
2458
2459        /* If the journal was unmounted cleanly then we don't want to
2460         * recover anything. Otherwise, journal_load will do that
2461         * dirty work for us :) */
2462        if (!dirty) {
2463                status = ocfs2_journal_wipe(osb->journal, 0);
2464                if (status < 0) {
2465                        mlog_errno(status);
2466                        goto finally;
2467                }
2468        } else {
2469                printk(KERN_NOTICE "ocfs2: File system on device (%s) was not "
2470                       "unmounted cleanly, recovering it.\n", osb->dev_str);
2471        }
2472
2473        local = ocfs2_mount_local(osb);
2474
2475        /* will play back anything left in the journal. */
2476        status = ocfs2_journal_load(osb->journal, local, dirty);
2477        if (status < 0) {
2478                mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2479                goto finally;
2480        }
2481
2482        if (dirty) {
2483                /* recover my local alloc if we didn't unmount cleanly. */
2484                status = ocfs2_begin_local_alloc_recovery(osb,
2485                                                          osb->slot_num,
2486                                                          &local_alloc);
2487                if (status < 0) {
2488                        mlog_errno(status);
2489                        goto finally;
2490                }
2491                /* we complete the recovery process after we've marked
2492                 * ourselves as mounted. */
2493        }
2494
2495        status = ocfs2_load_local_alloc(osb);
2496        if (status < 0) {
2497                mlog_errno(status);
2498                goto finally;
2499        }
2500
2501        if (dirty) {
2502                /* Recovery will be completed after we've mounted the
2503                 * rest of the volume. */
2504                osb->dirty = 1;
2505                osb->local_alloc_copy = local_alloc;
2506                local_alloc = NULL;
2507        }
2508
2509        /* go through each journal, trylock it and if you get the
2510         * lock, and it's marked as dirty, set the bit in the recover
2511         * map and launch a recovery thread for it. */
2512        status = ocfs2_mark_dead_nodes(osb);
2513        if (status < 0) {
2514                mlog_errno(status);
2515                goto finally;
2516        }
2517
2518        status = ocfs2_compute_replay_slots(osb);
2519        if (status < 0)
2520                mlog_errno(status);
2521
2522finally:
2523        if (local_alloc)
2524                kfree(local_alloc);
2525
2526        if (status)
2527                mlog_errno(status);
2528        return status;
2529}
2530
2531/*
2532 * The routine gets called from dismount or close whenever a dismount on
2533 * volume is requested and the osb open count becomes 1.
2534 * It will remove the osb from the global list and also free up all the
2535 * initialized resources and fileobject.
2536 */
2537static void ocfs2_delete_osb(struct ocfs2_super *osb)
2538{
2539        /* This function assumes that the caller has the main osb resource */
2540
2541        ocfs2_free_slot_info(osb);
2542
2543        kfree(osb->osb_orphan_wipes);
2544        kfree(osb->slot_recovery_generations);
2545        /* FIXME
2546         * This belongs in journal shutdown, but because we have to
2547         * allocate osb->journal at the start of ocfs2_initialize_osb(),
2548         * we free it here.
2549         */
2550        kfree(osb->journal);
2551        if (osb->local_alloc_copy)
2552                kfree(osb->local_alloc_copy);
2553        kfree(osb->uuid_str);
2554        ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2555        memset(osb, 0, sizeof(struct ocfs2_super));
2556}
2557
2558/* Put OCFS2 into a readonly state, or (if the user specifies it),
2559 * panic(). We do not support continue-on-error operation. */
2560static void ocfs2_handle_error(struct super_block *sb)
2561{
2562        struct ocfs2_super *osb = OCFS2_SB(sb);
2563
2564        if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2565                panic("OCFS2: (device %s): panic forced after error\n",
2566                      sb->s_id);
2567
2568        ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2569
2570        if (sb->s_flags & MS_RDONLY &&
2571            (ocfs2_is_soft_readonly(osb) ||
2572             ocfs2_is_hard_readonly(osb)))
2573                return;
2574
2575        printk(KERN_CRIT "File system is now read-only due to the potential "
2576               "of on-disk corruption. Please run fsck.ocfs2 once the file "
2577               "system is unmounted.\n");
2578        sb->s_flags |= MS_RDONLY;
2579        ocfs2_set_ro_flag(osb, 0);
2580}
2581
2582static char error_buf[1024];
2583
2584void __ocfs2_error(struct super_block *sb,
2585                   const char *function,
2586                   const char *fmt, ...)
2587{
2588        va_list args;
2589
2590        va_start(args, fmt);
2591        vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2592        va_end(args);
2593
2594        /* Not using mlog here because we want to show the actual
2595         * function the error came from. */
2596        printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2597               sb->s_id, function, error_buf);
2598
2599        ocfs2_handle_error(sb);
2600}
2601
2602/* Handle critical errors. This is intentionally more drastic than
2603 * ocfs2_handle_error, so we only use for things like journal errors,
2604 * etc. */
2605void __ocfs2_abort(struct super_block* sb,
2606                   const char *function,
2607                   const char *fmt, ...)
2608{
2609        va_list args;
2610
2611        va_start(args, fmt);
2612        vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2613        va_end(args);
2614
2615        printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2616               sb->s_id, function, error_buf);
2617
2618        /* We don't have the cluster support yet to go straight to
2619         * hard readonly in here. Until then, we want to keep
2620         * ocfs2_abort() so that we can at least mark critical
2621         * errors.
2622         *
2623         * TODO: This should abort the journal and alert other nodes
2624         * that our slot needs recovery. */
2625
2626        /* Force a panic(). This stinks, but it's better than letting
2627         * things continue without having a proper hard readonly
2628         * here. */
2629        if (!ocfs2_mount_local(OCFS2_SB(sb)))
2630                OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2631        ocfs2_handle_error(sb);
2632}
2633
2634/*
2635 * Void signal blockers, because in-kernel sigprocmask() only fails
2636 * when SIG_* is wrong.
2637 */
2638void ocfs2_block_signals(sigset_t *oldset)
2639{
2640        int rc;
2641        sigset_t blocked;
2642
2643        sigfillset(&blocked);
2644        rc = sigprocmask(SIG_BLOCK, &blocked, oldset);
2645        BUG_ON(rc);
2646}
2647
2648void ocfs2_unblock_signals(sigset_t *oldset)
2649{
2650        int rc = sigprocmask(SIG_SETMASK, oldset, NULL);
2651        BUG_ON(rc);
2652}
2653
2654module_init(ocfs2_init);
2655module_exit(ocfs2_exit);
2656
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