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\n", "Commit",
 290                        (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
 291                        osb->osb_commit_interval);
 292
 293        out += snprintf(buf + out, len - out,
 294                        "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
 295                        "Journal", osb->journal->j_state,
 296                        osb->journal->j_trans_id,
 297                        atomic_read(&osb->journal->j_num_trans));
 298
 299        out += snprintf(buf + out, len - out,
 300                        "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
 301                        "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
 302                        "Stats",
 303                        atomic_read(&osb->alloc_stats.bitmap_data),
 304                        atomic_read(&osb->alloc_stats.local_data),
 305                        atomic_read(&osb->alloc_stats.bg_allocs),
 306                        atomic_read(&osb->alloc_stats.moves),
 307                        atomic_read(&osb->alloc_stats.bg_extends));
 308
 309        out += snprintf(buf + out, len - out,
 310                        "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
 311                        "Default: %u bits\n",
 312                        "LocalAlloc", osb->local_alloc_state,
 313                        (unsigned long long)osb->la_last_gd,
 314                        osb->local_alloc_bits, osb->local_alloc_default_bits);
 315
 316        spin_lock(&osb->osb_lock);
 317        out += snprintf(buf + out, len - out,
 318                        "%10s => InodeSlot: %d  StolenInodes: %d, "
 319                        "MetaSlot: %d  StolenMeta: %d\n", "Steal",
 320                        osb->s_inode_steal_slot,
 321                        atomic_read(&osb->s_num_inodes_stolen),
 322                        osb->s_meta_steal_slot,
 323                        atomic_read(&osb->s_num_meta_stolen));
 324        spin_unlock(&osb->osb_lock);
 325
 326        out += snprintf(buf + out, len - out, "OrphanScan => ");
 327        out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
 328                        os->os_count, os->os_seqno);
 329        out += snprintf(buf + out, len - out, " Last Scan: ");
 330        if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
 331                out += snprintf(buf + out, len - out, "Disabled\n");
 332        else
 333                out += snprintf(buf + out, len - out, "%lu seconds ago\n",
 334                                (get_seconds() - os->os_scantime.tv_sec));
 335
 336        out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
 337                        "Slots", "Num", "RecoGen");
 338        for (i = 0; i < osb->max_slots; ++i) {
 339                out += snprintf(buf + out, len - out,
 340                                "%10s  %c %3d  %10d\n",
 341                                " ",
 342                                (i == osb->slot_num ? '*' : ' '),
 343                                i, osb->slot_recovery_generations[i]);
 344        }
 345
 346        return out;
 347}
 348
 349static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 350{
 351        struct ocfs2_super *osb = inode->i_private;
 352        char *buf = NULL;
 353
 354        buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 355        if (!buf)
 356                goto bail;
 357
 358        i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
 359
 360        file->private_data = buf;
 361
 362        return 0;
 363bail:
 364        return -ENOMEM;
 365}
 366
 367static int ocfs2_debug_release(struct inode *inode, struct file *file)
 368{
 369        kfree(file->private_data);
 370        return 0;
 371}
 372
 373static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 374                                size_t nbytes, loff_t *ppos)
 375{
 376        return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
 377                                       i_size_read(file->f_mapping->host));
 378}
 379#else
 380static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 381{
 382        return 0;
 383}
 384static int ocfs2_debug_release(struct inode *inode, struct file *file)
 385{
 386        return 0;
 387}
 388static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 389                                size_t nbytes, loff_t *ppos)
 390{
 391        return 0;
 392}
 393#endif  /* CONFIG_DEBUG_FS */
 394
 395static const struct file_operations ocfs2_osb_debug_fops = {
 396        .open =         ocfs2_osb_debug_open,
 397        .release =      ocfs2_debug_release,
 398        .read =         ocfs2_debug_read,
 399        .llseek =       generic_file_llseek,
 400};
 401
 402static int ocfs2_sync_fs(struct super_block *sb, int wait)
 403{
 404        int status;
 405        tid_t target;
 406        struct ocfs2_super *osb = OCFS2_SB(sb);
 407
 408        if (ocfs2_is_hard_readonly(osb))
 409                return -EROFS;
 410
 411        if (wait) {
 412                status = ocfs2_flush_truncate_log(osb);
 413                if (status < 0)
 414                        mlog_errno(status);
 415        } else {
 416                ocfs2_schedule_truncate_log_flush(osb, 0);
 417        }
 418
 419        if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
 420                                      &target)) {
 421                if (wait)
 422                        jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 423                                             target);
 424        }
 425        return 0;
 426}
 427
 428static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
 429{
 430        if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
 431            && (ino == USER_QUOTA_SYSTEM_INODE
 432                || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
 433                return 0;
 434        if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
 435            && (ino == GROUP_QUOTA_SYSTEM_INODE
 436                || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
 437                return 0;
 438        return 1;
 439}
 440
 441static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 442{
 443        struct inode *new = NULL;
 444        int status = 0;
 445        int i;
 446
 447        new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 448        if (IS_ERR(new)) {
 449                status = PTR_ERR(new);
 450                mlog_errno(status);
 451                goto bail;
 452        }
 453        osb->root_inode = new;
 454
 455        new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 456        if (IS_ERR(new)) {
 457                status = PTR_ERR(new);
 458                mlog_errno(status);
 459                goto bail;
 460        }
 461        osb->sys_root_inode = new;
 462
 463        for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 464             i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 465                if (!ocfs2_need_system_inode(osb, i))
 466                        continue;
 467                new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 468                if (!new) {
 469                        ocfs2_release_system_inodes(osb);
 470                        status = -EINVAL;
 471                        mlog_errno(status);
 472                        /* FIXME: Should ERROR_RO_FS */
 473                        mlog(ML_ERROR, "Unable to load system inode %d, "
 474                             "possibly corrupt fs?", i);
 475                        goto bail;
 476                }
 477                // the array now has one ref, so drop this one
 478                iput(new);
 479        }
 480
 481bail:
 482        if (status)
 483                mlog_errno(status);
 484        return status;
 485}
 486
 487static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 488{
 489        struct inode *new = NULL;
 490        int status = 0;
 491        int i;
 492
 493        for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 494             i < NUM_SYSTEM_INODES;
 495             i++) {
 496                if (!ocfs2_need_system_inode(osb, i))
 497                        continue;
 498                new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 499                if (!new) {
 500                        ocfs2_release_system_inodes(osb);
 501                        status = -EINVAL;
 502                        mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 503                             status, i, osb->slot_num);
 504                        goto bail;
 505                }
 506                /* the array now has one ref, so drop this one */
 507                iput(new);
 508        }
 509
 510bail:
 511        if (status)
 512                mlog_errno(status);
 513        return status;
 514}
 515
 516static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 517{
 518        int i;
 519        struct inode *inode;
 520
 521        for (i = 0; i < NUM_GLOBAL_SYSTEM_INODES; i++) {
 522                inode = osb->global_system_inodes[i];
 523                if (inode) {
 524                        iput(inode);
 525                        osb->global_system_inodes[i] = NULL;
 526                }
 527        }
 528
 529        inode = osb->sys_root_inode;
 530        if (inode) {
 531                iput(inode);
 532                osb->sys_root_inode = NULL;
 533        }
 534
 535        inode = osb->root_inode;
 536        if (inode) {
 537                iput(inode);
 538                osb->root_inode = NULL;
 539        }
 540
 541        if (!osb->local_system_inodes)
 542                return;
 543
 544        for (i = 0; i < NUM_LOCAL_SYSTEM_INODES * osb->max_slots; i++) {
 545                if (osb->local_system_inodes[i]) {
 546                        iput(osb->local_system_inodes[i]);
 547                        osb->local_system_inodes[i] = NULL;
 548                }
 549        }
 550
 551        kfree(osb->local_system_inodes);
 552        osb->local_system_inodes = NULL;
 553}
 554
 555/* We're allocating fs objects, use GFP_NOFS */
 556static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 557{
 558        struct ocfs2_inode_info *oi;
 559
 560        oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 561        if (!oi)
 562                return NULL;
 563
 564        jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
 565        return &oi->vfs_inode;
 566}
 567
 568static void ocfs2_i_callback(struct rcu_head *head)
 569{
 570        struct inode *inode = container_of(head, struct inode, i_rcu);
 571        kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 572}
 573
 574static void ocfs2_destroy_inode(struct inode *inode)
 575{
 576        call_rcu(&inode->i_rcu, ocfs2_i_callback);
 577}
 578
 579static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 580                                                unsigned int cbits)
 581{
 582        unsigned int bytes = 1 << cbits;
 583        unsigned int trim = bytes;
 584        unsigned int bitshift = 32;
 585
 586        /*
 587         * i_size and all block offsets in ocfs2 are always 64 bits
 588         * wide. i_clusters is 32 bits, in cluster-sized units. So on
 589         * 64 bit platforms, cluster size will be the limiting factor.
 590         */
 591
 592#if BITS_PER_LONG == 32
 593# if defined(CONFIG_LBDAF)
 594        BUILD_BUG_ON(sizeof(sector_t) != 8);
 595        /*
 596         * We might be limited by page cache size.
 597         */
 598        if (bytes > PAGE_CACHE_SIZE) {
 599                bytes = PAGE_CACHE_SIZE;
 600                trim = 1;
 601                /*
 602                 * Shift by 31 here so that we don't get larger than
 603                 * MAX_LFS_FILESIZE
 604                 */
 605                bitshift = 31;
 606        }
 607# else
 608        /*
 609         * We are limited by the size of sector_t. Use block size, as
 610         * that's what we expose to the VFS.
 611         */
 612        bytes = 1 << bbits;
 613        trim = 1;
 614        bitshift = 31;
 615# endif
 616#endif
 617
 618        /*
 619         * Trim by a whole cluster when we can actually approach the
 620         * on-disk limits. Otherwise we can overflow i_clusters when
 621         * an extent start is at the max offset.
 622         */
 623        return (((unsigned long long)bytes) << bitshift) - trim;
 624}
 625
 626static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 627{
 628        int incompat_features;
 629        int ret = 0;
 630        struct mount_options parsed_options;
 631        struct ocfs2_super *osb = OCFS2_SB(sb);
 632        u32 tmp;
 633
 634        if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
 635            !ocfs2_check_set_options(sb, &parsed_options)) {
 636                ret = -EINVAL;
 637                goto out;
 638        }
 639
 640        tmp = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL |
 641                OCFS2_MOUNT_HB_NONE;
 642        if ((osb->s_mount_opt & tmp) != (parsed_options.mount_opt & tmp)) {
 643                ret = -EINVAL;
 644                mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 645                goto out;
 646        }
 647
 648        if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 649            (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 650                ret = -EINVAL;
 651                mlog(ML_ERROR, "Cannot change data mode on remount\n");
 652                goto out;
 653        }
 654
 655        /* Probably don't want this on remount; it might
 656         * mess with other nodes */
 657        if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 658            (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 659                ret = -EINVAL;
 660                mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 661                goto out;
 662        }
 663
 664        /* We're going to/from readonly mode. */
 665        if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 666                /* Disable quota accounting before remounting RO */
 667                if (*flags & MS_RDONLY) {
 668                        ret = ocfs2_susp_quotas(osb, 0);
 669                        if (ret < 0)
 670                                goto out;
 671                }
 672                /* Lock here so the check of HARD_RO and the potential
 673                 * setting of SOFT_RO is atomic. */
 674                spin_lock(&osb->osb_lock);
 675                if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 676                        mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 677                        ret = -EROFS;
 678                        goto unlock_osb;
 679                }
 680
 681                if (*flags & MS_RDONLY) {
 682                        sb->s_flags |= MS_RDONLY;
 683                        osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 684                } else {
 685                        if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 686                                mlog(ML_ERROR, "Cannot remount RDWR "
 687                                     "filesystem due to previous errors.\n");
 688                                ret = -EROFS;
 689                                goto unlock_osb;
 690                        }
 691                        incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 692                        if (incompat_features) {
 693                                mlog(ML_ERROR, "Cannot remount RDWR because "
 694                                     "of unsupported optional features "
 695                                     "(%x).\n", incompat_features);
 696                                ret = -EINVAL;
 697                                goto unlock_osb;
 698                        }
 699                        sb->s_flags &= ~MS_RDONLY;
 700                        osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 701                }
 702                trace_ocfs2_remount(sb->s_flags, osb->osb_flags, *flags);
 703unlock_osb:
 704                spin_unlock(&osb->osb_lock);
 705                /* Enable quota accounting after remounting RW */
 706                if (!ret && !(*flags & MS_RDONLY)) {
 707                        if (sb_any_quota_suspended(sb))
 708                                ret = ocfs2_susp_quotas(osb, 1);
 709                        else
 710                                ret = ocfs2_enable_quotas(osb);
 711                        if (ret < 0) {
 712                                /* Return back changes... */
 713                                spin_lock(&osb->osb_lock);
 714                                sb->s_flags |= MS_RDONLY;
 715                                osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 716                                spin_unlock(&osb->osb_lock);
 717                                goto out;
 718                        }
 719                }
 720        }
 721
 722        if (!ret) {
 723                /* Only save off the new mount options in case of a successful
 724                 * remount. */
 725                osb->s_mount_opt = parsed_options.mount_opt;
 726                osb->s_atime_quantum = parsed_options.atime_quantum;
 727                osb->preferred_slot = parsed_options.slot;
 728                if (parsed_options.commit_interval)
 729                        osb->osb_commit_interval = parsed_options.commit_interval;
 730
 731                if (!ocfs2_is_hard_readonly(osb))
 732                        ocfs2_set_journal_params(osb);
 733
 734                sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 735                        ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
 736                                                        MS_POSIXACL : 0);
 737        }
 738out:
 739        return ret;
 740}
 741
 742static int ocfs2_sb_probe(struct super_block *sb,
 743                          struct buffer_head **bh,
 744                          int *sector_size,
 745                          struct ocfs2_blockcheck_stats *stats)
 746{
 747        int status, tmpstat;
 748        struct ocfs1_vol_disk_hdr *hdr;
 749        struct ocfs2_dinode *di;
 750        int blksize;
 751
 752        *bh = NULL;
 753
 754        /* may be > 512 */
 755        *sector_size = bdev_logical_block_size(sb->s_bdev);
 756        if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 757                mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 758                     *sector_size, OCFS2_MAX_BLOCKSIZE);
 759                status = -EINVAL;
 760                goto bail;
 761        }
 762
 763        /* Can this really happen? */
 764        if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 765                *sector_size = OCFS2_MIN_BLOCKSIZE;
 766
 767        /* check block zero for old format */
 768        status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 769        if (status < 0) {
 770                mlog_errno(status);
 771                goto bail;
 772        }
 773        hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 774        if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 775                mlog(ML_ERROR, "incompatible version: %u.%u\n",
 776                     hdr->major_version, hdr->minor_version);
 777                status = -EINVAL;
 778        }
 779        if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 780                   strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 781                mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 782                     hdr->signature);
 783                status = -EINVAL;
 784        }
 785        brelse(*bh);
 786        *bh = NULL;
 787        if (status < 0) {
 788                mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 789                     "upgraded before mounting with ocfs v2\n");
 790                goto bail;
 791        }
 792
 793        /*
 794         * Now check at magic offset for 512, 1024, 2048, 4096
 795         * blocksizes.  4096 is the maximum blocksize because it is
 796         * the minimum clustersize.
 797         */
 798        status = -EINVAL;
 799        for (blksize = *sector_size;
 800             blksize <= OCFS2_MAX_BLOCKSIZE;
 801             blksize <<= 1) {
 802                tmpstat = ocfs2_get_sector(sb, bh,
 803                                           OCFS2_SUPER_BLOCK_BLKNO,
 804                                           blksize);
 805                if (tmpstat < 0) {
 806                        status = tmpstat;
 807                        mlog_errno(status);
 808                        break;
 809                }
 810                di = (struct ocfs2_dinode *) (*bh)->b_data;
 811                memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
 812                spin_lock_init(&stats->b_lock);
 813                tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
 814                if (tmpstat < 0) {
 815                        brelse(*bh);
 816                        *bh = NULL;
 817                }
 818                if (tmpstat != -EAGAIN) {
 819                        status = tmpstat;
 820                        break;
 821                }
 822        }
 823
 824bail:
 825        return status;
 826}
 827
 828static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 829{
 830        u32 hb_enabled = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL;
 831
 832        if (osb->s_mount_opt & hb_enabled) {
 833                if (ocfs2_mount_local(osb)) {
 834                        mlog(ML_ERROR, "Cannot heartbeat on a locally "
 835                             "mounted device.\n");
 836                        return -EINVAL;
 837                }
 838                if (ocfs2_userspace_stack(osb)) {
 839                        mlog(ML_ERROR, "Userspace stack expected, but "
 840                             "o2cb heartbeat arguments passed to mount\n");
 841                        return -EINVAL;
 842                }
 843                if (((osb->s_mount_opt & OCFS2_MOUNT_HB_GLOBAL) &&
 844                     !ocfs2_cluster_o2cb_global_heartbeat(osb)) ||
 845                    ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) &&
 846                     ocfs2_cluster_o2cb_global_heartbeat(osb))) {
 847                        mlog(ML_ERROR, "Mismatching o2cb heartbeat modes\n");
 848                        return -EINVAL;
 849                }
 850        }
 851
 852        if (!(osb->s_mount_opt & hb_enabled)) {
 853                if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 854                    !ocfs2_userspace_stack(osb)) {
 855                        mlog(ML_ERROR, "Heartbeat has to be started to mount "
 856                             "a read-write clustered device.\n");
 857                        return -EINVAL;
 858                }
 859        }
 860
 861        return 0;
 862}
 863
 864/*
 865 * If we're using a userspace stack, mount should have passed
 866 * a name that matches the disk.  If not, mount should not
 867 * have passed a stack.
 868 */
 869static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 870                                        struct mount_options *mopt)
 871{
 872        if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 873                mlog(ML_ERROR,
 874                     "cluster stack passed to mount, but this filesystem "
 875                     "does not support it\n");
 876                return -EINVAL;
 877        }
 878
 879        if (ocfs2_userspace_stack(osb) &&
 880            strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 881                    OCFS2_STACK_LABEL_LEN)) {
 882                mlog(ML_ERROR,
 883                     "cluster stack passed to mount (\"%s\") does not "
 884                     "match the filesystem (\"%s\")\n",
 885                     mopt->cluster_stack,
 886                     osb->osb_cluster_stack);
 887                return -EINVAL;
 888        }
 889
 890        return 0;
 891}
 892
 893static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
 894{
 895        int type;
 896        struct super_block *sb = osb->sb;
 897        unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 898                                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 899        int status = 0;
 900
 901        for (type = 0; type < MAXQUOTAS; type++) {
 902                if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 903                        continue;
 904                if (unsuspend)
 905                        status = dquot_resume(sb, type);
 906                else {
 907                        struct ocfs2_mem_dqinfo *oinfo;
 908
 909                        /* Cancel periodic syncing before suspending */
 910                        oinfo = sb_dqinfo(sb, type)->dqi_priv;
 911                        cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 912                        status = dquot_suspend(sb, type);
 913                }
 914                if (status < 0)
 915                        break;
 916        }
 917        if (status < 0)
 918                mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
 919                     "remount (error = %d).\n", status);
 920        return status;
 921}
 922
 923static int ocfs2_enable_quotas(struct ocfs2_super *osb)
 924{
 925        struct inode *inode[MAXQUOTAS] = { NULL, NULL };
 926        struct super_block *sb = osb->sb;
 927        unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 928                                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 929        unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 930                                        LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 931        int status;
 932        int type;
 933
 934        sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
 935        for (type = 0; type < MAXQUOTAS; type++) {
 936                if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 937                        continue;
 938                inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
 939                                                        osb->slot_num);
 940                if (!inode[type]) {
 941                        status = -ENOENT;
 942                        goto out_quota_off;
 943                }
 944                status = dquot_enable(inode[type], type, QFMT_OCFS2,
 945                                      DQUOT_USAGE_ENABLED);
 946                if (status < 0)
 947                        goto out_quota_off;
 948        }
 949
 950        for (type = 0; type < MAXQUOTAS; type++)
 951                iput(inode[type]);
 952        return 0;
 953out_quota_off:
 954        ocfs2_disable_quotas(osb);
 955        for (type = 0; type < MAXQUOTAS; type++)
 956                iput(inode[type]);
 957        mlog_errno(status);
 958        return status;
 959}
 960
 961static void ocfs2_disable_quotas(struct ocfs2_super *osb)
 962{
 963        int type;
 964        struct inode *inode;
 965        struct super_block *sb = osb->sb;
 966        struct ocfs2_mem_dqinfo *oinfo;
 967
 968        /* We mostly ignore errors in this function because there's not much
 969         * we can do when we see them */
 970        for (type = 0; type < MAXQUOTAS; type++) {
 971                if (!sb_has_quota_loaded(sb, type))
 972                        continue;
 973                /* Cancel periodic syncing before we grab dqonoff_mutex */
 974                oinfo = sb_dqinfo(sb, type)->dqi_priv;
 975                cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 976                inode = igrab(sb->s_dquot.files[type]);
 977                /* Turn off quotas. This will remove all dquot structures from
 978                 * memory and so they will be automatically synced to global
 979                 * quota files */
 980                dquot_disable(sb, type, DQUOT_USAGE_ENABLED |
 981                                        DQUOT_LIMITS_ENABLED);
 982                if (!inode)
 983                        continue;
 984                iput(inode);
 985        }
 986}
 987
 988/* Handle quota on quotactl */
 989static int ocfs2_quota_on(struct super_block *sb, int type, int format_id)
 990{
 991        unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 992                                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 993
 994        if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 995                return -EINVAL;
 996
 997        return dquot_enable(sb_dqopt(sb)->files[type], type,
 998                            format_id, DQUOT_LIMITS_ENABLED);
 999}
1000
1001/* Handle quota off quotactl */
1002static int ocfs2_quota_off(struct super_block *sb, int type)
1003{
1004        return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
1005}
1006
1007static const struct quotactl_ops ocfs2_quotactl_ops = {
1008        .quota_on_meta  = ocfs2_quota_on,
1009        .quota_off      = ocfs2_quota_off,
1010        .quota_sync     = dquot_quota_sync,
1011        .get_info       = dquot_get_dqinfo,
1012        .set_info       = dquot_set_dqinfo,
1013        .get_dqblk      = dquot_get_dqblk,
1014        .set_dqblk      = dquot_set_dqblk,
1015};
1016
1017static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
1018{
1019        struct dentry *root;
1020        int status, sector_size;
1021        struct mount_options parsed_options;
1022        struct inode *inode = NULL;
1023        struct ocfs2_super *osb = NULL;
1024        struct buffer_head *bh = NULL;
1025        char nodestr[12];
1026        struct ocfs2_blockcheck_stats stats;
1027
1028        trace_ocfs2_fill_super(sb, data, silent);
1029
1030        if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
1031                status = -EINVAL;
1032                goto read_super_error;
1033        }
1034
1035        /* probe for superblock */
1036        status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
1037        if (status < 0) {
1038                mlog(ML_ERROR, "superblock probe failed!\n");
1039                goto read_super_error;
1040        }
1041
1042        status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1043        osb = OCFS2_SB(sb);
1044        if (status < 0) {
1045                mlog_errno(status);
1046                goto read_super_error;
1047        }
1048        brelse(bh);
1049        bh = NULL;
1050
1051        if (!ocfs2_check_set_options(sb, &parsed_options)) {
1052                status = -EINVAL;
1053                goto read_super_error;
1054        }
1055        osb->s_mount_opt = parsed_options.mount_opt;
1056        osb->s_atime_quantum = parsed_options.atime_quantum;
1057        osb->preferred_slot = parsed_options.slot;
1058        osb->osb_commit_interval = parsed_options.commit_interval;
1059
1060        ocfs2_la_set_sizes(osb, parsed_options.localalloc_opt);
1061        osb->osb_resv_level = parsed_options.resv_level;
1062        osb->osb_dir_resv_level = parsed_options.resv_level;
1063        if (parsed_options.dir_resv_level == -1)
1064                osb->osb_dir_resv_level = parsed_options.resv_level;
1065        else
1066                osb->osb_dir_resv_level = parsed_options.dir_resv_level;
1067
1068        status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1069        if (status)
1070                goto read_super_error;
1071
1072        sb->s_magic = OCFS2_SUPER_MAGIC;
1073
1074        sb->s_flags = (sb->s_flags & ~(MS_POSIXACL | MS_NOSEC)) |
1075                ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1076
1077        /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1078         * heartbeat=none */
1079        if (bdev_read_only(sb->s_bdev)) {
1080                if (!(sb->s_flags & MS_RDONLY)) {
1081                        status = -EACCES;
1082                        mlog(ML_ERROR, "Readonly device detected but readonly "
1083                             "mount was not specified.\n");
1084                        goto read_super_error;
1085                }
1086
1087                /* You should not be able to start a local heartbeat
1088                 * on a readonly device. */
1089                if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1090                        status = -EROFS;
1091                        mlog(ML_ERROR, "Local heartbeat specified on readonly "
1092                             "device.\n");
1093                        goto read_super_error;
1094                }
1095
1096                status = ocfs2_check_journals_nolocks(osb);
1097                if (status < 0) {
1098                        if (status == -EROFS)
1099                                mlog(ML_ERROR, "Recovery required on readonly "
1100                                     "file system, but write access is "
1101                                     "unavailable.\n");
1102                        else
1103                                mlog_errno(status);
1104                        goto read_super_error;
1105                }
1106
1107                ocfs2_set_ro_flag(osb, 1);
1108
1109                printk(KERN_NOTICE "ocfs2: Readonly device (%s) detected. "
1110                       "Cluster services will not be used for this mount. "
1111                       "Recovery will be skipped.\n", osb->dev_str);
1112        }
1113
1114        if (!ocfs2_is_hard_readonly(osb)) {
1115                if (sb->s_flags & MS_RDONLY)
1116                        ocfs2_set_ro_flag(osb, 0);
1117        }
1118
1119        status = ocfs2_verify_heartbeat(osb);
1120        if (status < 0) {
1121                mlog_errno(status);
1122                goto read_super_error;
1123        }
1124
1125        osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1126                                                 ocfs2_debugfs_root);
1127        if (!osb->osb_debug_root) {
1128                status = -EINVAL;
1129                mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1130                goto read_super_error;
1131        }
1132
1133        osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1134                                            osb->osb_debug_root,
1135                                            osb,
1136                                            &ocfs2_osb_debug_fops);
1137        if (!osb->osb_ctxt) {
1138                status = -EINVAL;
1139                mlog_errno(status);
1140                goto read_super_error;
1141        }
1142
1143        if (ocfs2_meta_ecc(osb)) {
1144                status = ocfs2_blockcheck_stats_debugfs_install(
1145                                                &osb->osb_ecc_stats,
1146                                                osb->osb_debug_root);
1147                if (status) {
1148                        mlog(ML_ERROR,
1149                             "Unable to create blockcheck statistics "
1150                             "files\n");
1151                        goto read_super_error;
1152                }
1153        }
1154
1155        status = ocfs2_mount_volume(sb);
1156        if (status < 0)
1157                goto read_super_error;
1158
1159        if (osb->root_inode)
1160                inode = igrab(osb->root_inode);
1161
1162        if (!inode) {
1163                status = -EIO;
1164                mlog_errno(status);
1165                goto read_super_error;
1166        }
1167
1168        root = d_make_root(inode);
1169        if (!root) {
1170                status = -ENOMEM;
1171                mlog_errno(status);
1172                goto read_super_error;
1173        }
1174
1175        sb->s_root = root;
1176
1177        ocfs2_complete_mount_recovery(osb);
1178
1179        if (ocfs2_mount_local(osb))
1180                snprintf(nodestr, sizeof(nodestr), "local");
1181        else
1182                snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1183
1184        printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1185               "with %s data mode.\n",
1186               osb->dev_str, nodestr, osb->slot_num,
1187               osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1188               "ordered");
1189
1190        atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1191        wake_up(&osb->osb_mount_event);
1192
1193        /* Now we can initialize quotas because we can afford to wait
1194         * for cluster locks recovery now. That also means that truncation
1195         * log recovery can happen but that waits for proper quota setup */
1196        if (!(sb->s_flags & MS_RDONLY)) {
1197                status = ocfs2_enable_quotas(osb);
1198                if (status < 0) {
1199                        /* We have to err-out specially here because
1200                         * s_root is already set */
1201                        mlog_errno(status);
1202                        atomic_set(&osb->vol_state, VOLUME_DISABLED);
1203                        wake_up(&osb->osb_mount_event);
1204                        return status;
1205                }
1206        }
1207
1208        ocfs2_complete_quota_recovery(osb);
1209
1210        /* Now we wake up again for processes waiting for quotas */
1211        atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1212        wake_up(&osb->osb_mount_event);
1213
1214        /* Start this when the mount is almost sure of being successful */
1215        ocfs2_orphan_scan_start(osb);
1216
1217        return status;
1218
1219read_super_error:
1220        brelse(bh);
1221
1222        if (osb) {
1223                atomic_set(&osb->vol_state, VOLUME_DISABLED);
1224                wake_up(&osb->osb_mount_event);
1225                ocfs2_dismount_volume(sb, 1);
1226        }
1227
1228        if (status)
1229                mlog_errno(status);
1230        return status;
1231}
1232
1233static struct dentry *ocfs2_mount(struct file_system_type *fs_type,
1234                        int flags,
1235                        const char *dev_name,
1236                        void *data)
1237{
1238        return mount_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super);
1239}
1240
1241static void ocfs2_kill_sb(struct super_block *sb)
1242{
1243        struct ocfs2_super *osb = OCFS2_SB(sb);
1244
1245        /* Failed mount? */
1246        if (!osb || atomic_read(&osb->vol_state) == VOLUME_DISABLED)
1247                goto out;
1248
1249        /* Prevent further queueing of inode drop events */
1250        spin_lock(&dentry_list_lock);
1251        ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
1252        spin_unlock(&dentry_list_lock);
1253        /* Wait for work to finish and/or remove it */
1254        cancel_work_sync(&osb->dentry_lock_work);
1255out:
1256        kill_block_super(sb);
1257}
1258
1259static struct file_system_type ocfs2_fs_type = {
1260        .owner          = THIS_MODULE,
1261        .name           = "ocfs2",
1262        .mount          = ocfs2_mount,
1263        .kill_sb        = ocfs2_kill_sb,
1264
1265        .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1266        .next           = NULL
1267};
1268MODULE_ALIAS_FS("ocfs2");
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        /*
1822         * Make sure all delayed rcu free inodes are flushed before we
1823         * destroy cache.
1824         */
1825        rcu_barrier();
1826        if (ocfs2_inode_cachep)
1827                kmem_cache_destroy(ocfs2_inode_cachep);
1828        ocfs2_inode_cachep = NULL;
1829
1830        if (ocfs2_dquot_cachep)
1831                kmem_cache_destroy(ocfs2_dquot_cachep);
1832        ocfs2_dquot_cachep = NULL;
1833
1834        if (ocfs2_qf_chunk_cachep)
1835                kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1836        ocfs2_qf_chunk_cachep = NULL;
1837}
1838
1839static int ocfs2_get_sector(struct super_block *sb,
1840                            struct buffer_head **bh,
1841                            int block,
1842                            int sect_size)
1843{
1844        if (!sb_set_blocksize(sb, sect_size)) {
1845                mlog(ML_ERROR, "unable to set blocksize\n");
1846                return -EIO;
1847        }
1848
1849        *bh = sb_getblk(sb, block);
1850        if (!*bh) {
1851                mlog_errno(-EIO);
1852                return -EIO;
1853        }
1854        lock_buffer(*bh);
1855        if (!buffer_dirty(*bh))
1856                clear_buffer_uptodate(*bh);
1857        unlock_buffer(*bh);
1858        ll_rw_block(READ, 1, bh);
1859        wait_on_buffer(*bh);
1860        if (!buffer_uptodate(*bh)) {
1861                mlog_errno(-EIO);
1862                brelse(*bh);
1863                *bh = NULL;
1864                return -EIO;
1865        }
1866
1867        return 0;
1868}
1869
1870static int ocfs2_mount_volume(struct super_block *sb)
1871{
1872        int status = 0;
1873        int unlock_super = 0;
1874        struct ocfs2_super *osb = OCFS2_SB(sb);
1875
1876        if (ocfs2_is_hard_readonly(osb))
1877                goto leave;
1878
1879        status = ocfs2_dlm_init(osb);
1880        if (status < 0) {
1881                mlog_errno(status);
1882                goto leave;
1883        }
1884
1885        status = ocfs2_super_lock(osb, 1);
1886        if (status < 0) {
1887                mlog_errno(status);
1888                goto leave;
1889        }
1890        unlock_super = 1;
1891
1892        /* This will load up the node map and add ourselves to it. */
1893        status = ocfs2_find_slot(osb);
1894        if (status < 0) {
1895                mlog_errno(status);
1896                goto leave;
1897        }
1898
1899        /* load all node-local system inodes */
1900        status = ocfs2_init_local_system_inodes(osb);
1901        if (status < 0) {
1902                mlog_errno(status);
1903                goto leave;
1904        }
1905
1906        status = ocfs2_check_volume(osb);
1907        if (status < 0) {
1908                mlog_errno(status);
1909                goto leave;
1910        }
1911
1912        status = ocfs2_truncate_log_init(osb);
1913        if (status < 0)
1914                mlog_errno(status);
1915
1916leave:
1917        if (unlock_super)
1918                ocfs2_super_unlock(osb, 1);
1919
1920        return status;
1921}
1922
1923static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1924{
1925        int tmp, hangup_needed = 0;
1926        struct ocfs2_super *osb = NULL;
1927        char nodestr[8];
1928
1929        trace_ocfs2_dismount_volume(sb);
1930
1931        BUG_ON(!sb);
1932        osb = OCFS2_SB(sb);
1933        BUG_ON(!osb);
1934
1935        debugfs_remove(osb->osb_ctxt);
1936
1937        /*
1938         * Flush inode dropping work queue so that deletes are
1939         * performed while the filesystem is still working
1940         */
1941        ocfs2_drop_all_dl_inodes(osb);
1942
1943        /* Orphan scan should be stopped as early as possible */
1944        ocfs2_orphan_scan_stop(osb);
1945
1946        ocfs2_disable_quotas(osb);
1947
1948        ocfs2_shutdown_local_alloc(osb);
1949
1950        ocfs2_truncate_log_shutdown(osb);
1951
1952        /* This will disable recovery and flush any recovery work. */
1953        ocfs2_recovery_exit(osb);
1954
1955        ocfs2_journal_shutdown(osb);
1956
1957        ocfs2_sync_blockdev(sb);
1958
1959        ocfs2_purge_refcount_trees(osb);
1960
1961        /* No cluster connection means we've failed during mount, so skip
1962         * all the steps which depended on that to complete. */
1963        if (osb->cconn) {
1964                tmp = ocfs2_super_lock(osb, 1);
1965                if (tmp < 0) {
1966                        mlog_errno(tmp);
1967                        return;
1968                }
1969        }
1970
1971        if (osb->slot_num != OCFS2_INVALID_SLOT)
1972                ocfs2_put_slot(osb);
1973
1974        if (osb->cconn)
1975                ocfs2_super_unlock(osb, 1);
1976
1977        ocfs2_release_system_inodes(osb);
1978
1979        /*
1980         * If we're dismounting due to mount error, mount.ocfs2 will clean
1981         * up heartbeat.  If we're a local mount, there is no heartbeat.
1982         * If we failed before we got a uuid_str yet, we can't stop
1983         * heartbeat.  Otherwise, do it.
1984         */
1985        if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str &&
1986            !ocfs2_is_hard_readonly(osb))
1987                hangup_needed = 1;
1988
1989        if (osb->cconn)
1990                ocfs2_dlm_shutdown(osb, hangup_needed);
1991
1992        ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1993        debugfs_remove(osb->osb_debug_root);
1994
1995        if (hangup_needed)
1996                ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1997
1998        atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1999
2000        if (ocfs2_mount_local(osb))
2001                snprintf(nodestr, sizeof(nodestr), "local");
2002        else
2003                snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
2004
2005        printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
2006               osb->dev_str, nodestr);
2007
2008        ocfs2_delete_osb(osb);
2009        kfree(osb);
2010        sb->s_dev = 0;
2011        sb->s_fs_info = NULL;
2012}
2013
2014static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
2015                                unsigned uuid_bytes)
2016{
2017        int i, ret;
2018        char *ptr;
2019
2020        BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
2021
2022        osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
2023        if (osb->uuid_str == NULL)
2024                return -ENOMEM;
2025
2026        for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
2027                /* print with null */
2028                ret = snprintf(ptr, 3, "%02X", uuid[i]);
2029                if (ret != 2) /* drop super cleans up */
2030                        return -EINVAL;
2031                /* then only advance past the last char */
2032                ptr += 2;
2033        }
2034
2035        return 0;
2036}
2037
2038/* Make sure entire volume is addressable by our journal.  Requires
2039   osb_clusters_at_boot to be valid and for the journal to have been
2040   initialized by ocfs2_journal_init(). */
2041static int ocfs2_journal_addressable(struct ocfs2_super *osb)
2042{
2043        int status = 0;
2044        u64 max_block =
2045                ocfs2_clusters_to_blocks(osb->sb,
2046                                         osb->osb_clusters_at_boot) - 1;
2047
2048        /* 32-bit block number is always OK. */
2049        if (max_block <= (u32)~0ULL)
2050                goto out;
2051
2052        /* Volume is "huge", so see if our journal is new enough to
2053           support it. */
2054        if (!(OCFS2_HAS_COMPAT_FEATURE(osb->sb,
2055                                       OCFS2_FEATURE_COMPAT_JBD2_SB) &&
2056              jbd2_journal_check_used_features(osb->journal->j_journal, 0, 0,
2057                                               JBD2_FEATURE_INCOMPAT_64BIT))) {
2058                mlog(ML_ERROR, "The journal cannot address the entire volume. "
2059                     "Enable the 'block64' journal option with tunefs.ocfs2");
2060                status = -EFBIG;
2061                goto out;
2062        }
2063
2064 out:
2065        return status;
2066}
2067
2068static int ocfs2_initialize_super(struct super_block *sb,
2069                                  struct buffer_head *bh,
2070                                  int sector_size,
2071                                  struct ocfs2_blockcheck_stats *stats)
2072{
2073        int status;
2074        int i, cbits, bbits;
2075        struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2076        struct inode *inode = NULL;
2077        struct ocfs2_journal *journal;
2078        __le32 uuid_net_key;
2079        struct ocfs2_super *osb;
2080        u64 total_blocks;
2081
2082        osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
2083        if (!osb) {
2084                status = -ENOMEM;
2085                mlog_errno(status);
2086                goto bail;
2087        }
2088
2089        sb->s_fs_info = osb;
2090        sb->s_op = &ocfs2_sops;
2091        sb->s_d_op = &ocfs2_dentry_ops;
2092        sb->s_export_op = &ocfs2_export_ops;
2093        sb->s_qcop = &ocfs2_quotactl_ops;
2094        sb->dq_op = &ocfs2_quota_operations;
2095        sb->s_xattr = ocfs2_xattr_handlers;
2096        sb->s_time_gran = 1;
2097        sb->s_flags |= MS_NOATIME;
2098        /* this is needed to support O_LARGEFILE */
2099        cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2100        bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
2101        sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
2102
2103        osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
2104
2105        for (i = 0; i < 3; i++)
2106                osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
2107        osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2108
2109        osb->sb = sb;
2110        /* Save off for ocfs2_rw_direct */
2111        osb->s_sectsize_bits = blksize_bits(sector_size);
2112        BUG_ON(!osb->s_sectsize_bits);
2113
2114        spin_lock_init(&osb->dc_task_lock);
2115        init_waitqueue_head(&osb->dc_event);
2116        osb->dc_work_sequence = 0;
2117        osb->dc_wake_sequence = 0;
2118        INIT_LIST_HEAD(&osb->blocked_lock_list);
2119        osb->blocked_lock_count = 0;
2120        spin_lock_init(&osb->osb_lock);
2121        spin_lock_init(&osb->osb_xattr_lock);
2122        ocfs2_init_steal_slots(osb);
2123
2124        atomic_set(&osb->alloc_stats.moves, 0);
2125        atomic_set(&osb->alloc_stats.local_data, 0);
2126        atomic_set(&osb->alloc_stats.bitmap_data, 0);
2127        atomic_set(&osb->alloc_stats.bg_allocs, 0);
2128        atomic_set(&osb->alloc_stats.bg_extends, 0);
2129
2130        /* Copy the blockcheck stats from the superblock probe */
2131        osb->osb_ecc_stats = *stats;
2132
2133        ocfs2_init_node_maps(osb);
2134
2135        snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2136                 MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2137
2138        osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2139        if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2140                mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2141                     osb->max_slots);
2142                status = -EINVAL;
2143                goto bail;
2144        }
2145
2146        ocfs2_orphan_scan_init(osb);
2147
2148        status = ocfs2_recovery_init(osb);
2149        if (status) {
2150                mlog(ML_ERROR, "Unable to initialize recovery state\n");
2151                mlog_errno(status);
2152                goto bail;
2153        }
2154
2155        init_waitqueue_head(&osb->checkpoint_event);
2156
2157        osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2158
2159        osb->slot_num = OCFS2_INVALID_SLOT;
2160
2161        osb->s_xattr_inline_size = le16_to_cpu(
2162                                        di->id2.i_super.s_xattr_inline_size);
2163
2164        osb->local_alloc_state = OCFS2_LA_UNUSED;
2165        osb->local_alloc_bh = NULL;
2166        INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2167
2168        init_waitqueue_head(&osb->osb_mount_event);
2169
2170        status = ocfs2_resmap_init(osb, &osb->osb_la_resmap);
2171        if (status) {
2172                mlog_errno(status);
2173                goto bail;
2174        }
2175
2176        osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2177        if (!osb->vol_label) {
2178                mlog(ML_ERROR, "unable to alloc vol label\n");
2179                status = -ENOMEM;
2180                goto bail;
2181        }
2182
2183        osb->slot_recovery_generations =
2184                kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2185                        GFP_KERNEL);
2186        if (!osb->slot_recovery_generations) {
2187                status = -ENOMEM;
2188                mlog_errno(status);
2189                goto bail;
2190        }
2191
2192        init_waitqueue_head(&osb->osb_wipe_event);
2193        osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2194                                        sizeof(*osb->osb_orphan_wipes),
2195                                        GFP_KERNEL);
2196        if (!osb->osb_orphan_wipes) {
2197                status = -ENOMEM;
2198                mlog_errno(status);
2199                goto bail;
2200        }
2201
2202        osb->osb_rf_lock_tree = RB_ROOT;
2203
2204        osb->s_feature_compat =
2205                le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2206        osb->s_feature_ro_compat =
2207                le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2208        osb->s_feature_incompat =
2209                le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2210
2211        if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2212                mlog(ML_ERROR, "couldn't mount because of unsupported "
2213                     "optional features (%x).\n", i);
2214                status = -EINVAL;
2215                goto bail;
2216        }
2217        if (!(osb->sb->s_flags & MS_RDONLY) &&
2218            (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2219                mlog(ML_ERROR, "couldn't mount RDWR because of "
2220                     "unsupported optional features (%x).\n", i);
2221                status = -EINVAL;
2222                goto bail;
2223        }
2224
2225        if (ocfs2_clusterinfo_valid(osb)) {
2226                osb->osb_stackflags =
2227                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stackflags;
2228                memcpy(osb->osb_cluster_stack,
2229                       OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2230                       OCFS2_STACK_LABEL_LEN);
2231                osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2232                if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2233                        mlog(ML_ERROR,
2234                             "couldn't mount because of an invalid "
2235                             "cluster stack label (%s) \n",
2236                             osb->osb_cluster_stack);
2237                        status = -EINVAL;
2238                        goto bail;
2239                }
2240        } else {
2241                /* The empty string is identical with classic tools that
2242                 * don't know about s_cluster_info. */
2243                osb->osb_cluster_stack[0] = '\0';
2244        }
2245
2246        get_random_bytes(&osb->s_next_generation, sizeof(u32));
2247
2248        /* FIXME
2249         * This should be done in ocfs2_journal_init(), but unknown
2250         * ordering issues will cause the filesystem to crash.
2251         * If anyone wants to figure out what part of the code
2252         * refers to osb->journal before ocfs2_journal_init() is run,
2253         * be my guest.
2254         */
2255        /* initialize our journal structure */
2256
2257        journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2258        if (!journal) {
2259                mlog(ML_ERROR, "unable to alloc journal\n");
2260                status = -ENOMEM;
2261                goto bail;
2262        }
2263        osb->journal = journal;
2264        journal->j_osb = osb;
2265
2266        atomic_set(&journal->j_num_trans, 0);
2267        init_rwsem(&journal->j_trans_barrier);
2268        init_waitqueue_head(&journal->j_checkpointed);
2269        spin_lock_init(&journal->j_lock);
2270        journal->j_trans_id = (unsigned long) 1;
2271        INIT_LIST_HEAD(&journal->j_la_cleanups);
2272        INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2273        journal->j_state = OCFS2_JOURNAL_FREE;
2274
2275        INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2276        osb->dentry_lock_list = NULL;
2277
2278        /* get some pseudo constants for clustersize bits */
2279        osb->s_clustersize_bits =
2280                le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2281        osb->s_clustersize = 1 << osb->s_clustersize_bits;
2282
2283        if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2284            osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2285                mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2286                     osb->s_clustersize);
2287                status = -EINVAL;
2288                goto bail;
2289        }
2290
2291        total_blocks = ocfs2_clusters_to_blocks(osb->sb,
2292                                                le32_to_cpu(di->i_clusters));
2293
2294        status = generic_check_addressable(osb->sb->s_blocksize_bits,
2295                                           total_blocks);
2296        if (status) {
2297                mlog(ML_ERROR, "Volume too large "
2298                     "to mount safely on this system");
2299                status = -EFBIG;
2300                goto bail;
2301        }
2302
2303        if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2304                                 sizeof(di->id2.i_super.s_uuid))) {
2305                mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2306                status = -ENOMEM;
2307                goto bail;
2308        }
2309
2310        memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2311
2312        strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2313        osb->vol_label[63] = '\0';
2314        osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2315        osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2316        osb->first_cluster_group_blkno =
2317                le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2318        osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2319        osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2320        trace_ocfs2_initialize_super(osb->vol_label, osb->uuid_str,
2321                                     (unsigned long long)osb->root_blkno,
2322                                     (unsigned long long)osb->system_dir_blkno,
2323                                     osb->s_clustersize_bits);
2324
2325        osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2326        if (!osb->osb_dlm_debug) {
2327                status = -ENOMEM;
2328                mlog_errno(status);
2329                goto bail;
2330        }
2331
2332        atomic_set(&osb->vol_state, VOLUME_INIT);
2333
2334        /* load root, system_dir, and all global system inodes */
2335        status = ocfs2_init_global_system_inodes(osb);
2336        if (status < 0) {
2337                mlog_errno(status);
2338                goto bail;
2339        }
2340
2341        /*
2342         * global bitmap
2343         */
2344        inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2345                                            OCFS2_INVALID_SLOT);
2346        if (!inode) {
2347                status = -EINVAL;
2348                mlog_errno(status);
2349                goto bail;
2350        }
2351
2352        osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2353        osb->osb_clusters_at_boot = OCFS2_I(inode)->ip_clusters;
2354        iput(inode);
2355
2356        osb->bitmap_cpg = ocfs2_group_bitmap_size(sb, 0,
2357                                 osb->s_feature_incompat) * 8;
2358
2359        status = ocfs2_init_slot_info(osb);
2360        if (status < 0) {
2361                mlog_errno(status);
2362                goto bail;
2363        }
2364        cleancache_init_shared_fs((char *)&di->id2.i_super.s_uuid, sb);
2365
2366bail:
2367        return status;
2368}
2369
2370/*
2371 * will return: -EAGAIN if it is ok to keep searching for superblocks
2372 *              -EINVAL if there is a bad superblock
2373 *              0 on success
2374 */
2375static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2376                               struct buffer_head *bh,
2377                               u32 blksz,
2378                               struct ocfs2_blockcheck_stats *stats)
2379{
2380        int status = -EAGAIN;
2381
2382        if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2383                   strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2384                /* We have to do a raw check of the feature here */
2385                if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2386                    OCFS2_FEATURE_INCOMPAT_META_ECC) {
2387                        status = ocfs2_block_check_validate(bh->b_data,
2388                                                            bh->b_size,
2389                                                            &di->i_check,
2390                                                            stats);
2391                        if (status)
2392                                goto out;
2393                }
2394                status = -EINVAL;
2395                if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2396                        mlog(ML_ERROR, "found superblock with incorrect block "
2397                             "size: found %u, should be %u\n",
2398                             1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2399                               blksz);
2400                } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2401                           OCFS2_MAJOR_REV_LEVEL ||
2402                           le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2403                           OCFS2_MINOR_REV_LEVEL) {
2404                        mlog(ML_ERROR, "found superblock with bad version: "
2405                             "found %u.%u, should be %u.%u\n",
2406                             le16_to_cpu(di->id2.i_super.s_major_rev_level),
2407                             le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2408                             OCFS2_MAJOR_REV_LEVEL,
2409                             OCFS2_MINOR_REV_LEVEL);
2410                } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2411                        mlog(ML_ERROR, "bad block number on superblock: "
2412                             "found %llu, should be %llu\n",
2413                             (unsigned long long)le64_to_cpu(di->i_blkno),
2414                             (unsigned long long)bh->b_blocknr);
2415                } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2416                            le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2417                        mlog(ML_ERROR, "bad cluster size found: %u\n",
2418                             1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2419                } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2420                        mlog(ML_ERROR, "bad root_blkno: 0\n");
2421                } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2422                        mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2423                } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2424                        mlog(ML_ERROR,
2425                             "Superblock slots found greater than file system "
2426                             "maximum: found %u, max %u\n",
2427                             le16_to_cpu(di->id2.i_super.s_max_slots),
2428                             OCFS2_MAX_SLOTS);
2429                } else {
2430                        /* found it! */
2431                        status = 0;
2432                }
2433        }
2434
2435out:
2436        if (status && status != -EAGAIN)
2437                mlog_errno(status);
2438        return status;
2439}
2440
2441static int ocfs2_check_volume(struct ocfs2_super *osb)
2442{
2443        int status;
2444        int dirty;
2445        int local;
2446        struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2447                                                  * recover
2448                                                  * ourselves. */
2449
2450        /* Init our journal object. */
2451        status = ocfs2_journal_init(osb->journal, &dirty);
2452        if (status < 0) {
2453                mlog(ML_ERROR, "Could not initialize journal!\n");
2454                goto finally;
2455        }
2456
2457        /* Now that journal has been initialized, check to make sure
2458           entire volume is addressable. */
2459        status = ocfs2_journal_addressable(osb);
2460        if (status)
2461                goto finally;
2462
2463        /* If the journal was unmounted cleanly then we don't want to
2464         * recover anything. Otherwise, journal_load will do that
2465         * dirty work for us :) */
2466        if (!dirty) {
2467                status = ocfs2_journal_wipe(osb->journal, 0);
2468                if (status < 0) {
2469                        mlog_errno(status);
2470                        goto finally;
2471                }
2472        } else {
2473                printk(KERN_NOTICE "ocfs2: File system on device (%s) was not "
2474                       "unmounted cleanly, recovering it.\n", osb->dev_str);
2475        }
2476
2477        local = ocfs2_mount_local(osb);
2478
2479        /* will play back anything left in the journal. */
2480        status = ocfs2_journal_load(osb->journal, local, dirty);
2481        if (status < 0) {
2482                mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2483                goto finally;
2484        }
2485
2486        if (dirty) {
2487                /* recover my local alloc if we didn't unmount cleanly. */
2488                status = ocfs2_begin_local_alloc_recovery(osb,
2489                                                          osb->slot_num,
2490                                                          &local_alloc);
2491                if (status < 0) {
2492                        mlog_errno(status);
2493                        goto finally;
2494                }
2495                /* we complete the recovery process after we've marked
2496                 * ourselves as mounted. */
2497        }
2498
2499        status = ocfs2_load_local_alloc(osb);
2500        if (status < 0) {
2501                mlog_errno(status);
2502                goto finally;
2503        }
2504
2505        if (dirty) {
2506                /* Recovery will be completed after we've mounted the
2507                 * rest of the volume. */
2508                osb->dirty = 1;
2509                osb->local_alloc_copy = local_alloc;
2510                local_alloc = NULL;
2511        }
2512
2513        /* go through each journal, trylock it and if you get the
2514         * lock, and it's marked as dirty, set the bit in the recover
2515         * map and launch a recovery thread for it. */
2516        status = ocfs2_mark_dead_nodes(osb);
2517        if (status < 0) {
2518                mlog_errno(status);
2519                goto finally;
2520        }
2521
2522        status = ocfs2_compute_replay_slots(osb);
2523        if (status < 0)
2524                mlog_errno(status);
2525
2526finally:
2527        kfree(local_alloc);
2528
2529        if (status)
2530                mlog_errno(status);
2531        return status;
2532}
2533
2534/*
2535 * The routine gets called from dismount or close whenever a dismount on
2536 * volume is requested and the osb open count becomes 1.
2537 * It will remove the osb from the global list and also free up all the
2538 * initialized resources and fileobject.
2539 */
2540static void ocfs2_delete_osb(struct ocfs2_super *osb)
2541{
2542        /* This function assumes that the caller has the main osb resource */
2543
2544        ocfs2_free_slot_info(osb);
2545
2546        kfree(osb->osb_orphan_wipes);
2547        kfree(osb->slot_recovery_generations);
2548        /* FIXME
2549         * This belongs in journal shutdown, but because we have to
2550         * allocate osb->journal at the start of ocfs2_initialize_osb(),
2551         * we free it here.
2552         */
2553        kfree(osb->journal);
2554        kfree(osb->local_alloc_copy);
2555        kfree(osb->uuid_str);
2556        ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2557        memset(osb, 0, sizeof(struct ocfs2_super));
2558}
2559
2560/* Put OCFS2 into a readonly state, or (if the user specifies it),
2561 * panic(). We do not support continue-on-error operation. */
2562static void ocfs2_handle_error(struct super_block *sb)
2563{
2564        struct ocfs2_super *osb = OCFS2_SB(sb);
2565
2566        if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2567                panic("OCFS2: (device %s): panic forced after error\n",
2568                      sb->s_id);
2569
2570        ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2571
2572        if (sb->s_flags & MS_RDONLY &&
2573            (ocfs2_is_soft_readonly(osb) ||
2574             ocfs2_is_hard_readonly(osb)))
2575                return;
2576
2577        printk(KERN_CRIT "File system is now read-only due to the potential "
2578               "of on-disk corruption. Please run fsck.ocfs2 once the file "
2579               "system is unmounted.\n");
2580        sb->s_flags |= MS_RDONLY;
2581        ocfs2_set_ro_flag(osb, 0);
2582}
2583
2584static char error_buf[1024];
2585
2586void __ocfs2_error(struct super_block *sb,
2587                   const char *function,
2588                   const char *fmt, ...)
2589{
2590        va_list args;
2591
2592        va_start(args, fmt);
2593        vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2594        va_end(args);
2595
2596        /* Not using mlog here because we want to show the actual
2597         * function the error came from. */
2598        printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2599               sb->s_id, function, error_buf);
2600
2601        ocfs2_handle_error(sb);
2602}
2603
2604/* Handle critical errors. This is intentionally more drastic than
2605 * ocfs2_handle_error, so we only use for things like journal errors,
2606 * etc. */
2607void __ocfs2_abort(struct super_block* sb,
2608                   const char *function,
2609                   const char *fmt, ...)
2610{
2611        va_list args;
2612
2613        va_start(args, fmt);
2614        vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2615        va_end(args);
2616
2617        printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2618               sb->s_id, function, error_buf);
2619
2620        /* We don't have the cluster support yet to go straight to
2621         * hard readonly in here. Until then, we want to keep
2622         * ocfs2_abort() so that we can at least mark critical
2623         * errors.
2624         *
2625         * TODO: This should abort the journal and alert other nodes
2626         * that our slot needs recovery. */
2627
2628        /* Force a panic(). This stinks, but it's better than letting
2629         * things continue without having a proper hard readonly
2630         * here. */
2631        if (!ocfs2_mount_local(OCFS2_SB(sb)))
2632                OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2633        ocfs2_handle_error(sb);
2634}
2635
2636/*
2637 * Void signal blockers, because in-kernel sigprocmask() only fails
2638 * when SIG_* is wrong.
2639 */
2640void ocfs2_block_signals(sigset_t *oldset)
2641{
2642        int rc;
2643        sigset_t blocked;
2644
2645        sigfillset(&blocked);
2646        rc = sigprocmask(SIG_BLOCK, &blocked, oldset);
2647        BUG_ON(rc);
2648}
2649
2650void ocfs2_unblock_signals(sigset_t *oldset)
2651{
2652        int rc = sigprocmask(SIG_SETMASK, oldset, NULL);
2653        BUG_ON(rc);
2654}
2655
2656module_init(ocfs2_init);
2657module_exit(ocfs2_exit);
2658
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