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OpenCloudOS-Kernel/fs/ocfs2/super.c

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/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* super.c
*
* load/unload driver, mount/dismount volumes
*
* Copyright (C) 2002, 2004 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/utsname.h>
#include <linux/init.h>
#include <linux/random.h>
#include <linux/statfs.h>
#include <linux/moduleparam.h>
#include <linux/blkdev.h>
#include <linux/socket.h>
#include <linux/inet.h>
#include <linux/parser.h>
#include <linux/crc32.h>
#include <linux/debugfs.h>
#include <linux/mount.h>
#include <linux/seq_file.h>
#define MLOG_MASK_PREFIX ML_SUPER
#include <cluster/masklog.h>
#include "ocfs2.h"
/* this should be the only file to include a version 1 header */
#include "ocfs1_fs_compat.h"
#include "alloc.h"
#include "dlmglue.h"
#include "export.h"
#include "extent_map.h"
#include "heartbeat.h"
#include "inode.h"
#include "journal.h"
#include "localalloc.h"
#include "namei.h"
#include "slot_map.h"
#include "super.h"
#include "sysfile.h"
#include "uptodate.h"
#include "ver.h"
#include "buffer_head_io.h"
static struct kmem_cache *ocfs2_inode_cachep = NULL;
/* OCFS2 needs to schedule several differnt types of work which
* require cluster locking, disk I/O, recovery waits, etc. Since these
* types of work tend to be heavy we avoid using the kernel events
* workqueue and schedule on our own. */
struct workqueue_struct *ocfs2_wq = NULL;
static struct dentry *ocfs2_debugfs_root = NULL;
MODULE_AUTHOR("Oracle");
MODULE_LICENSE("GPL");
struct mount_options
{
unsigned long commit_interval;
unsigned long mount_opt;
unsigned int atime_quantum;
signed short slot;
unsigned int localalloc_opt;
char cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
};
static int ocfs2_parse_options(struct super_block *sb, char *options,
struct mount_options *mopt,
int is_remount);
static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
static void ocfs2_put_super(struct super_block *sb);
static int ocfs2_mount_volume(struct super_block *sb);
static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
static int ocfs2_initialize_mem_caches(void);
static void ocfs2_free_mem_caches(void);
static void ocfs2_delete_osb(struct ocfs2_super *osb);
static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
static int ocfs2_sync_fs(struct super_block *sb, int wait);
static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
static int ocfs2_check_volume(struct ocfs2_super *osb);
static int ocfs2_verify_volume(struct ocfs2_dinode *di,
struct buffer_head *bh,
u32 sectsize);
static int ocfs2_initialize_super(struct super_block *sb,
struct buffer_head *bh,
int sector_size);
static int ocfs2_get_sector(struct super_block *sb,
struct buffer_head **bh,
int block,
int sect_size);
static void ocfs2_write_super(struct super_block *sb);
static struct inode *ocfs2_alloc_inode(struct super_block *sb);
static void ocfs2_destroy_inode(struct inode *inode);
static const struct super_operations ocfs2_sops = {
.statfs = ocfs2_statfs,
.alloc_inode = ocfs2_alloc_inode,
.destroy_inode = ocfs2_destroy_inode,
.drop_inode = ocfs2_drop_inode,
.clear_inode = ocfs2_clear_inode,
.delete_inode = ocfs2_delete_inode,
.sync_fs = ocfs2_sync_fs,
.write_super = ocfs2_write_super,
.put_super = ocfs2_put_super,
.remount_fs = ocfs2_remount,
.show_options = ocfs2_show_options,
};
enum {
Opt_barrier,
Opt_err_panic,
Opt_err_ro,
Opt_intr,
Opt_nointr,
Opt_hb_none,
Opt_hb_local,
Opt_data_ordered,
Opt_data_writeback,
Opt_atime_quantum,
Opt_slot,
Opt_commit,
Opt_localalloc,
Opt_localflocks,
Opt_stack,
Opt_err,
};
static match_table_t tokens = {
{Opt_barrier, "barrier=%u"},
{Opt_err_panic, "errors=panic"},
{Opt_err_ro, "errors=remount-ro"},
{Opt_intr, "intr"},
{Opt_nointr, "nointr"},
{Opt_hb_none, OCFS2_HB_NONE},
{Opt_hb_local, OCFS2_HB_LOCAL},
{Opt_data_ordered, "data=ordered"},
{Opt_data_writeback, "data=writeback"},
{Opt_atime_quantum, "atime_quantum=%u"},
{Opt_slot, "preferred_slot=%u"},
{Opt_commit, "commit=%u"},
{Opt_localalloc, "localalloc=%d"},
{Opt_localflocks, "localflocks"},
{Opt_stack, "cluster_stack=%s"},
{Opt_err, NULL}
};
/*
* write_super and sync_fs ripped right out of ext3.
*/
static void ocfs2_write_super(struct super_block *sb)
{
if (mutex_trylock(&sb->s_lock) != 0)
BUG();
sb->s_dirt = 0;
}
static int ocfs2_sync_fs(struct super_block *sb, int wait)
{
int status;
tid_t target;
struct ocfs2_super *osb = OCFS2_SB(sb);
sb->s_dirt = 0;
if (ocfs2_is_hard_readonly(osb))
return -EROFS;
if (wait) {
status = ocfs2_flush_truncate_log(osb);
if (status < 0)
mlog_errno(status);
} else {
ocfs2_schedule_truncate_log_flush(osb, 0);
}
if (journal_start_commit(OCFS2_SB(sb)->journal->j_journal, &target)) {
if (wait)
log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
target);
}
return 0;
}
static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
{
struct inode *new = NULL;
int status = 0;
int i;
mlog_entry_void();
new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
if (IS_ERR(new)) {
status = PTR_ERR(new);
mlog_errno(status);
goto bail;
}
osb->root_inode = new;
new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
if (IS_ERR(new)) {
status = PTR_ERR(new);
mlog_errno(status);
goto bail;
}
osb->sys_root_inode = new;
for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
if (!new) {
ocfs2_release_system_inodes(osb);
status = -EINVAL;
mlog_errno(status);
/* FIXME: Should ERROR_RO_FS */
mlog(ML_ERROR, "Unable to load system inode %d, "
"possibly corrupt fs?", i);
goto bail;
}
// the array now has one ref, so drop this one
iput(new);
}
bail:
mlog_exit(status);
return status;
}
static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
{
struct inode *new = NULL;
int status = 0;
int i;
mlog_entry_void();
for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
i < NUM_SYSTEM_INODES;
i++) {
new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
if (!new) {
ocfs2_release_system_inodes(osb);
status = -EINVAL;
mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
status, i, osb->slot_num);
goto bail;
}
/* the array now has one ref, so drop this one */
iput(new);
}
bail:
mlog_exit(status);
return status;
}
static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
{
int i;
struct inode *inode;
mlog_entry_void();
for (i = 0; i < NUM_SYSTEM_INODES; i++) {
inode = osb->system_inodes[i];
if (inode) {
iput(inode);
osb->system_inodes[i] = NULL;
}
}
inode = osb->sys_root_inode;
if (inode) {
iput(inode);
osb->sys_root_inode = NULL;
}
inode = osb->root_inode;
if (inode) {
iput(inode);
osb->root_inode = NULL;
}
mlog_exit(0);
}
/* We're allocating fs objects, use GFP_NOFS */
static struct inode *ocfs2_alloc_inode(struct super_block *sb)
{
struct ocfs2_inode_info *oi;
oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
if (!oi)
return NULL;
return &oi->vfs_inode;
}
static void ocfs2_destroy_inode(struct inode *inode)
{
kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
}
static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
unsigned int cbits)
{
unsigned int bytes = 1 << cbits;
unsigned int trim = bytes;
unsigned int bitshift = 32;
/*
* i_size and all block offsets in ocfs2 are always 64 bits
* wide. i_clusters is 32 bits, in cluster-sized units. So on
* 64 bit platforms, cluster size will be the limiting factor.
*/
#if BITS_PER_LONG == 32
# if defined(CONFIG_LBD)
BUILD_BUG_ON(sizeof(sector_t) != 8);
/*
* We might be limited by page cache size.
*/
if (bytes > PAGE_CACHE_SIZE) {
bytes = PAGE_CACHE_SIZE;
trim = 1;
/*
* Shift by 31 here so that we don't get larger than
* MAX_LFS_FILESIZE
*/
bitshift = 31;
}
# else
/*
* We are limited by the size of sector_t. Use block size, as
* that's what we expose to the VFS.
*/
bytes = 1 << bbits;
trim = 1;
bitshift = 31;
# endif
#endif
/*
* Trim by a whole cluster when we can actually approach the
* on-disk limits. Otherwise we can overflow i_clusters when
* an extent start is at the max offset.
*/
return (((unsigned long long)bytes) << bitshift) - trim;
}
static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
{
int incompat_features;
int ret = 0;
struct mount_options parsed_options;
struct ocfs2_super *osb = OCFS2_SB(sb);
if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
ret = -EINVAL;
goto out;
}
if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
(parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
ret = -EINVAL;
mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
goto out;
}
if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
(parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
ret = -EINVAL;
mlog(ML_ERROR, "Cannot change data mode on remount\n");
goto out;
}
/* We're going to/from readonly mode. */
if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
/* Lock here so the check of HARD_RO and the potential
* setting of SOFT_RO is atomic. */
spin_lock(&osb->osb_lock);
if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
ret = -EROFS;
goto unlock_osb;
}
if (*flags & MS_RDONLY) {
mlog(0, "Going to ro mode.\n");
sb->s_flags |= MS_RDONLY;
osb->osb_flags |= OCFS2_OSB_SOFT_RO;
} else {
mlog(0, "Making ro filesystem writeable.\n");
if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
mlog(ML_ERROR, "Cannot remount RDWR "
"filesystem due to previous errors.\n");
ret = -EROFS;
goto unlock_osb;
}
incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
if (incompat_features) {
mlog(ML_ERROR, "Cannot remount RDWR because "
"of unsupported optional features "
"(%x).\n", incompat_features);
ret = -EINVAL;
goto unlock_osb;
}
sb->s_flags &= ~MS_RDONLY;
osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
}
unlock_osb:
spin_unlock(&osb->osb_lock);
}
if (!ret) {
/* Only save off the new mount options in case of a successful
* remount. */
osb->s_mount_opt = parsed_options.mount_opt;
osb->s_atime_quantum = parsed_options.atime_quantum;
osb->preferred_slot = parsed_options.slot;
if (parsed_options.commit_interval)
osb->osb_commit_interval = parsed_options.commit_interval;
if (!ocfs2_is_hard_readonly(osb))
ocfs2_set_journal_params(osb);
}
out:
return ret;
}
static int ocfs2_sb_probe(struct super_block *sb,
struct buffer_head **bh,
int *sector_size)
{
int status, tmpstat;
struct ocfs1_vol_disk_hdr *hdr;
struct ocfs2_dinode *di;
int blksize;
*bh = NULL;
/* may be > 512 */
*sector_size = bdev_hardsect_size(sb->s_bdev);
if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
*sector_size, OCFS2_MAX_BLOCKSIZE);
status = -EINVAL;
goto bail;
}
/* Can this really happen? */
if (*sector_size < OCFS2_MIN_BLOCKSIZE)
*sector_size = OCFS2_MIN_BLOCKSIZE;
/* check block zero for old format */
status = ocfs2_get_sector(sb, bh, 0, *sector_size);
if (status < 0) {
mlog_errno(status);
goto bail;
}
hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
if (hdr->major_version == OCFS1_MAJOR_VERSION) {
mlog(ML_ERROR, "incompatible version: %u.%u\n",
hdr->major_version, hdr->minor_version);
status = -EINVAL;
}
if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
mlog(ML_ERROR, "incompatible volume signature: %8s\n",
hdr->signature);
status = -EINVAL;
}
brelse(*bh);
*bh = NULL;
if (status < 0) {
mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
"upgraded before mounting with ocfs v2\n");
goto bail;
}
/*
* Now check at magic offset for 512, 1024, 2048, 4096
* blocksizes. 4096 is the maximum blocksize because it is
* the minimum clustersize.
*/
status = -EINVAL;
for (blksize = *sector_size;
blksize <= OCFS2_MAX_BLOCKSIZE;
blksize <<= 1) {
tmpstat = ocfs2_get_sector(sb, bh,
OCFS2_SUPER_BLOCK_BLKNO,
blksize);
if (tmpstat < 0) {
status = tmpstat;
mlog_errno(status);
goto bail;
}
di = (struct ocfs2_dinode *) (*bh)->b_data;
status = ocfs2_verify_volume(di, *bh, blksize);
if (status >= 0)
goto bail;
brelse(*bh);
*bh = NULL;
if (status != -EAGAIN)
break;
}
bail:
return status;
}
static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
{
if (ocfs2_mount_local(osb)) {
if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
mlog(ML_ERROR, "Cannot heartbeat on a locally "
"mounted device.\n");
return -EINVAL;
}
}
if (ocfs2_userspace_stack(osb)) {
if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
mlog(ML_ERROR, "Userspace stack expected, but "
"o2cb heartbeat arguments passed to mount\n");
return -EINVAL;
}
}
if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
!ocfs2_userspace_stack(osb)) {
mlog(ML_ERROR, "Heartbeat has to be started to mount "
"a read-write clustered device.\n");
return -EINVAL;
}
}
return 0;
}
/*
* If we're using a userspace stack, mount should have passed
* a name that matches the disk. If not, mount should not
* have passed a stack.
*/
static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
struct mount_options *mopt)
{
if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
mlog(ML_ERROR,
"cluster stack passed to mount, but this filesystem "
"does not support it\n");
return -EINVAL;
}
if (ocfs2_userspace_stack(osb) &&
strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
OCFS2_STACK_LABEL_LEN)) {
mlog(ML_ERROR,
"cluster stack passed to mount (\"%s\") does not "
"match the filesystem (\"%s\")\n",
mopt->cluster_stack,
osb->osb_cluster_stack);
return -EINVAL;
}
return 0;
}
static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
{
struct dentry *root;
int status, sector_size;
struct mount_options parsed_options;
struct inode *inode = NULL;
struct ocfs2_super *osb = NULL;
struct buffer_head *bh = NULL;
char nodestr[8];
mlog_entry("%p, %p, %i", sb, data, silent);
if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
status = -EINVAL;
goto read_super_error;
}
/* probe for superblock */
status = ocfs2_sb_probe(sb, &bh, &sector_size);
if (status < 0) {
mlog(ML_ERROR, "superblock probe failed!\n");
goto read_super_error;
}
status = ocfs2_initialize_super(sb, bh, sector_size);
osb = OCFS2_SB(sb);
if (status < 0) {
mlog_errno(status);
goto read_super_error;
}
brelse(bh);
bh = NULL;
osb->s_mount_opt = parsed_options.mount_opt;
osb->s_atime_quantum = parsed_options.atime_quantum;
osb->preferred_slot = parsed_options.slot;
osb->osb_commit_interval = parsed_options.commit_interval;
osb->local_alloc_size = parsed_options.localalloc_opt;
status = ocfs2_verify_userspace_stack(osb, &parsed_options);
if (status)
goto read_super_error;
sb->s_magic = OCFS2_SUPER_MAGIC;
/* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
* heartbeat=none */
if (bdev_read_only(sb->s_bdev)) {
if (!(sb->s_flags & MS_RDONLY)) {
status = -EACCES;
mlog(ML_ERROR, "Readonly device detected but readonly "
"mount was not specified.\n");
goto read_super_error;
}
/* You should not be able to start a local heartbeat
* on a readonly device. */
if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
status = -EROFS;
mlog(ML_ERROR, "Local heartbeat specified on readonly "
"device.\n");
goto read_super_error;
}
status = ocfs2_check_journals_nolocks(osb);
if (status < 0) {
if (status == -EROFS)
mlog(ML_ERROR, "Recovery required on readonly "
"file system, but write access is "
"unavailable.\n");
else
mlog_errno(status);
goto read_super_error;
}
ocfs2_set_ro_flag(osb, 1);
printk(KERN_NOTICE "Readonly device detected. No cluster "
"services will be utilized for this mount. Recovery "
"will be skipped.\n");
}
if (!ocfs2_is_hard_readonly(osb)) {
if (sb->s_flags & MS_RDONLY)
ocfs2_set_ro_flag(osb, 0);
}
status = ocfs2_verify_heartbeat(osb);
if (status < 0) {
mlog_errno(status);
goto read_super_error;
}
osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
ocfs2_debugfs_root);
if (!osb->osb_debug_root) {
status = -EINVAL;
mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
goto read_super_error;
}
status = ocfs2_mount_volume(sb);
if (osb->root_inode)
inode = igrab(osb->root_inode);
if (status < 0)
goto read_super_error;
if (!inode) {
status = -EIO;
mlog_errno(status);
goto read_super_error;
}
root = d_alloc_root(inode);
if (!root) {
status = -ENOMEM;
mlog_errno(status);
goto read_super_error;
}
sb->s_root = root;
ocfs2_complete_mount_recovery(osb);
if (ocfs2_mount_local(osb))
snprintf(nodestr, sizeof(nodestr), "local");
else
snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
"with %s data mode.\n",
osb->dev_str, nodestr, osb->slot_num,
osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
"ordered");
atomic_set(&osb->vol_state, VOLUME_MOUNTED);
wake_up(&osb->osb_mount_event);
mlog_exit(status);
return status;
read_super_error:
if (bh != NULL)
brelse(bh);
if (inode)
iput(inode);
if (osb) {
atomic_set(&osb->vol_state, VOLUME_DISABLED);
wake_up(&osb->osb_mount_event);
ocfs2_dismount_volume(sb, 1);
}
mlog_exit(status);
return status;
}
static int ocfs2_get_sb(struct file_system_type *fs_type,
int flags,
const char *dev_name,
void *data,
struct vfsmount *mnt)
{
return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
mnt);
}
static struct file_system_type ocfs2_fs_type = {
.owner = THIS_MODULE,
.name = "ocfs2",
.get_sb = ocfs2_get_sb, /* is this called when we mount
* the fs? */
.kill_sb = kill_block_super, /* set to the generic one
* right now, but do we
* need to change that? */
.fs_flags = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
.next = NULL
};
static int ocfs2_parse_options(struct super_block *sb,
char *options,
struct mount_options *mopt,
int is_remount)
{
int status;
char *p;
mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
options ? options : "(none)");
mopt->commit_interval = 0;
mopt->mount_opt = 0;
mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
mopt->slot = OCFS2_INVALID_SLOT;
mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
mopt->cluster_stack[0] = '\0';
if (!options) {
status = 1;
goto bail;
}
while ((p = strsep(&options, ",")) != NULL) {
int token, option;
substring_t args[MAX_OPT_ARGS];
if (!*p)
continue;
token = match_token(p, tokens, args);
switch (token) {
case Opt_hb_local:
mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
break;
case Opt_hb_none:
mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
break;
case Opt_barrier:
if (match_int(&args[0], &option)) {
status = 0;
goto bail;
}
if (option)
mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
else
mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
break;
case Opt_intr:
mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
break;
case Opt_nointr:
mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
break;
case Opt_err_panic:
mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
break;
case Opt_err_ro:
mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
break;
case Opt_data_ordered:
mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
break;
case Opt_data_writeback:
mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
break;
case Opt_atime_quantum:
if (match_int(&args[0], &option)) {
status = 0;
goto bail;
}
if (option >= 0)
mopt->atime_quantum = option;
break;
case Opt_slot:
option = 0;
if (match_int(&args[0], &option)) {
status = 0;
goto bail;
}
if (option)
mopt->slot = (s16)option;
break;
case Opt_commit:
option = 0;
if (match_int(&args[0], &option)) {
status = 0;
goto bail;
}
if (option < 0)
return 0;
if (option == 0)
option = JBD_DEFAULT_MAX_COMMIT_AGE;
mopt->commit_interval = HZ * option;
break;
case Opt_localalloc:
option = 0;
if (match_int(&args[0], &option)) {
status = 0;
goto bail;
}
if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
mopt->localalloc_opt = option;
break;
case Opt_localflocks:
/*
* Changing this during remount could race
* flock() requests, or "unbalance" existing
* ones (e.g., a lock is taken in one mode but
* dropped in the other). If users care enough
* to flip locking modes during remount, we
* could add a "local" flag to individual
* flock structures for proper tracking of
* state.
*/
if (!is_remount)
mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
break;
case Opt_stack:
/* Check both that the option we were passed
* is of the right length and that it is a proper
* string of the right length.
*/
if (((args[0].to - args[0].from) !=
OCFS2_STACK_LABEL_LEN) ||
(strnlen(args[0].from,
OCFS2_STACK_LABEL_LEN) !=
OCFS2_STACK_LABEL_LEN)) {
mlog(ML_ERROR,
"Invalid cluster_stack option\n");
status = 0;
goto bail;
}
memcpy(mopt->cluster_stack, args[0].from,
OCFS2_STACK_LABEL_LEN);
mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
break;
default:
mlog(ML_ERROR,
"Unrecognized mount option \"%s\" "
"or missing value\n", p);
status = 0;
goto bail;
}
}
status = 1;
bail:
mlog_exit(status);
return status;
}
static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
{
struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
unsigned long opts = osb->s_mount_opt;
if (opts & OCFS2_MOUNT_HB_LOCAL)
seq_printf(s, ",_netdev,heartbeat=local");
else
seq_printf(s, ",heartbeat=none");
if (opts & OCFS2_MOUNT_NOINTR)
seq_printf(s, ",nointr");
if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
seq_printf(s, ",data=writeback");
else
seq_printf(s, ",data=ordered");
if (opts & OCFS2_MOUNT_BARRIER)
seq_printf(s, ",barrier=1");
if (opts & OCFS2_MOUNT_ERRORS_PANIC)
seq_printf(s, ",errors=panic");
else
seq_printf(s, ",errors=remount-ro");
if (osb->preferred_slot != OCFS2_INVALID_SLOT)
seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
if (osb->osb_commit_interval)
seq_printf(s, ",commit=%u",
(unsigned) (osb->osb_commit_interval / HZ));
if (osb->local_alloc_size != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
seq_printf(s, ",localalloc=%d", osb->local_alloc_size);
if (opts & OCFS2_MOUNT_LOCALFLOCKS)
seq_printf(s, ",localflocks,");
if (osb->osb_cluster_stack[0])
seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
osb->osb_cluster_stack);
return 0;
}
static int __init ocfs2_init(void)
{
int status;
mlog_entry_void();
ocfs2_print_version();
status = init_ocfs2_uptodate_cache();
if (status < 0) {
mlog_errno(status);
goto leave;
}
status = ocfs2_initialize_mem_caches();
if (status < 0) {
mlog_errno(status);
goto leave;
}
ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
if (!ocfs2_wq) {
status = -ENOMEM;
goto leave;
}
ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
if (!ocfs2_debugfs_root) {
status = -EFAULT;
mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
}
ocfs2_set_locking_protocol();
leave:
if (status < 0) {
ocfs2_free_mem_caches();
exit_ocfs2_uptodate_cache();
}
mlog_exit(status);
if (status >= 0) {
return register_filesystem(&ocfs2_fs_type);
} else
return -1;
}
static void __exit ocfs2_exit(void)
{
mlog_entry_void();
if (ocfs2_wq) {
flush_workqueue(ocfs2_wq);
destroy_workqueue(ocfs2_wq);
}
debugfs_remove(ocfs2_debugfs_root);
ocfs2_free_mem_caches();
unregister_filesystem(&ocfs2_fs_type);
exit_ocfs2_uptodate_cache();
mlog_exit_void();
}
static void ocfs2_put_super(struct super_block *sb)
{
mlog_entry("(0x%p)\n", sb);
ocfs2_sync_blockdev(sb);
ocfs2_dismount_volume(sb, 0);
mlog_exit_void();
}
static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct ocfs2_super *osb;
u32 numbits, freebits;
int status;
struct ocfs2_dinode *bm_lock;
struct buffer_head *bh = NULL;
struct inode *inode = NULL;
mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
osb = OCFS2_SB(dentry->d_sb);
inode = ocfs2_get_system_file_inode(osb,
GLOBAL_BITMAP_SYSTEM_INODE,
OCFS2_INVALID_SLOT);
if (!inode) {
mlog(ML_ERROR, "failed to get bitmap inode\n");
status = -EIO;
goto bail;
}
status = ocfs2_inode_lock(inode, &bh, 0);
if (status < 0) {
mlog_errno(status);
goto bail;
}
bm_lock = (struct ocfs2_dinode *) bh->b_data;
numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
buf->f_type = OCFS2_SUPER_MAGIC;
buf->f_bsize = dentry->d_sb->s_blocksize;
buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
buf->f_blocks = ((sector_t) numbits) *
(osb->s_clustersize >> osb->sb->s_blocksize_bits);
buf->f_bfree = ((sector_t) freebits) *
(osb->s_clustersize >> osb->sb->s_blocksize_bits);
buf->f_bavail = buf->f_bfree;
buf->f_files = numbits;
buf->f_ffree = freebits;
brelse(bh);
ocfs2_inode_unlock(inode, 0);
status = 0;
bail:
if (inode)
iput(inode);
mlog_exit(status);
return status;
}
static void ocfs2_inode_init_once(struct kmem_cache *cachep, void *data)
{
struct ocfs2_inode_info *oi = data;
oi->ip_flags = 0;
oi->ip_open_count = 0;
spin_lock_init(&oi->ip_lock);
ocfs2_extent_map_init(&oi->vfs_inode);
INIT_LIST_HEAD(&oi->ip_io_markers);
oi->ip_created_trans = 0;
oi->ip_last_trans = 0;
oi->ip_dir_start_lookup = 0;
init_rwsem(&oi->ip_alloc_sem);
mutex_init(&oi->ip_io_mutex);
oi->ip_blkno = 0ULL;
oi->ip_clusters = 0;
ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
ocfs2_lock_res_init_once(&oi->ip_open_lockres);
ocfs2_metadata_cache_init(&oi->vfs_inode);
inode_init_once(&oi->vfs_inode);
}
static int ocfs2_initialize_mem_caches(void)
{
ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
sizeof(struct ocfs2_inode_info),
0,
(SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
SLAB_MEM_SPREAD),
ocfs2_inode_init_once);
if (!ocfs2_inode_cachep)
return -ENOMEM;
return 0;
}
static void ocfs2_free_mem_caches(void)
{
if (ocfs2_inode_cachep)
kmem_cache_destroy(ocfs2_inode_cachep);
ocfs2_inode_cachep = NULL;
}
static int ocfs2_get_sector(struct super_block *sb,
struct buffer_head **bh,
int block,
int sect_size)
{
if (!sb_set_blocksize(sb, sect_size)) {
mlog(ML_ERROR, "unable to set blocksize\n");
return -EIO;
}
*bh = sb_getblk(sb, block);
if (!*bh) {
mlog_errno(-EIO);
return -EIO;
}
lock_buffer(*bh);
if (!buffer_dirty(*bh))
clear_buffer_uptodate(*bh);
unlock_buffer(*bh);
ll_rw_block(READ, 1, bh);
wait_on_buffer(*bh);
return 0;
}
static int ocfs2_mount_volume(struct super_block *sb)
{
int status = 0;
int unlock_super = 0;
struct ocfs2_super *osb = OCFS2_SB(sb);
mlog_entry_void();
if (ocfs2_is_hard_readonly(osb))
goto leave;
status = ocfs2_dlm_init(osb);
if (status < 0) {
mlog_errno(status);
goto leave;
}
status = ocfs2_super_lock(osb, 1);
if (status < 0) {
mlog_errno(status);
goto leave;
}
unlock_super = 1;
/* This will load up the node map and add ourselves to it. */
status = ocfs2_find_slot(osb);
if (status < 0) {
mlog_errno(status);
goto leave;
}
/* load all node-local system inodes */
status = ocfs2_init_local_system_inodes(osb);
if (status < 0) {
mlog_errno(status);
goto leave;
}
status = ocfs2_check_volume(osb);
if (status < 0) {
mlog_errno(status);
goto leave;
}
status = ocfs2_truncate_log_init(osb);
if (status < 0) {
mlog_errno(status);
goto leave;
}
if (ocfs2_mount_local(osb))
goto leave;
leave:
if (unlock_super)
ocfs2_super_unlock(osb, 1);
mlog_exit(status);
return status;
}
static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
{
int tmp, hangup_needed = 0;
struct ocfs2_super *osb = NULL;
char nodestr[8];
mlog_entry("(0x%p)\n", sb);
BUG_ON(!sb);
osb = OCFS2_SB(sb);
BUG_ON(!osb);
ocfs2_shutdown_local_alloc(osb);
ocfs2_truncate_log_shutdown(osb);
/* This will disable recovery and flush any recovery work. */
ocfs2_recovery_exit(osb);
ocfs2_journal_shutdown(osb);
ocfs2_sync_blockdev(sb);
/* No cluster connection means we've failed during mount, so skip
* all the steps which depended on that to complete. */
if (osb->cconn) {
tmp = ocfs2_super_lock(osb, 1);
if (tmp < 0) {
mlog_errno(tmp);
return;
}
}
if (osb->slot_num != OCFS2_INVALID_SLOT)
ocfs2_put_slot(osb);
if (osb->cconn)
ocfs2_super_unlock(osb, 1);
ocfs2_release_system_inodes(osb);
/*
* If we're dismounting due to mount error, mount.ocfs2 will clean
* up heartbeat. If we're a local mount, there is no heartbeat.
* If we failed before we got a uuid_str yet, we can't stop
* heartbeat. Otherwise, do it.
*/
if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
hangup_needed = 1;
if (osb->cconn)
ocfs2_dlm_shutdown(osb, hangup_needed);
debugfs_remove(osb->osb_debug_root);
if (hangup_needed)
ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
if (ocfs2_mount_local(osb))
snprintf(nodestr, sizeof(nodestr), "local");
else
snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
osb->dev_str, nodestr);
ocfs2_delete_osb(osb);
kfree(osb);
sb->s_dev = 0;
sb->s_fs_info = NULL;
}
static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
unsigned uuid_bytes)
{
int i, ret;
char *ptr;
BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
if (osb->uuid_str == NULL)
return -ENOMEM;
for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
/* print with null */
ret = snprintf(ptr, 3, "%02X", uuid[i]);
if (ret != 2) /* drop super cleans up */
return -EINVAL;
/* then only advance past the last char */
ptr += 2;
}
return 0;
}
static int ocfs2_initialize_super(struct super_block *sb,
struct buffer_head *bh,
int sector_size)
{
int status;
int i, cbits, bbits;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
struct inode *inode = NULL;
struct ocfs2_journal *journal;
__le32 uuid_net_key;
struct ocfs2_super *osb;
mlog_entry_void();
osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
if (!osb) {
status = -ENOMEM;
mlog_errno(status);
goto bail;
}
sb->s_fs_info = osb;
sb->s_op = &ocfs2_sops;
sb->s_export_op = &ocfs2_export_ops;
sb->s_time_gran = 1;
sb->s_flags |= MS_NOATIME;
/* this is needed to support O_LARGEFILE */
cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
osb->sb = sb;
/* Save off for ocfs2_rw_direct */
osb->s_sectsize_bits = blksize_bits(sector_size);
BUG_ON(!osb->s_sectsize_bits);
spin_lock_init(&osb->dc_task_lock);
init_waitqueue_head(&osb->dc_event);
osb->dc_work_sequence = 0;
osb->dc_wake_sequence = 0;
INIT_LIST_HEAD(&osb->blocked_lock_list);
osb->blocked_lock_count = 0;
spin_lock_init(&osb->osb_lock);
ocfs2_init_inode_steal_slot(osb);
atomic_set(&osb->alloc_stats.moves, 0);
atomic_set(&osb->alloc_stats.local_data, 0);
atomic_set(&osb->alloc_stats.bitmap_data, 0);
atomic_set(&osb->alloc_stats.bg_allocs, 0);
atomic_set(&osb->alloc_stats.bg_extends, 0);
ocfs2_init_node_maps(osb);
snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
status = ocfs2_recovery_init(osb);
if (status) {
mlog(ML_ERROR, "Unable to initialize recovery state\n");
mlog_errno(status);
goto bail;
}
init_waitqueue_head(&osb->checkpoint_event);
atomic_set(&osb->needs_checkpoint, 0);
osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
osb->slot_num = OCFS2_INVALID_SLOT;
osb->local_alloc_state = OCFS2_LA_UNUSED;
osb->local_alloc_bh = NULL;
init_waitqueue_head(&osb->osb_mount_event);
osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
if (!osb->vol_label) {
mlog(ML_ERROR, "unable to alloc vol label\n");
status = -ENOMEM;
goto bail;
}
osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
osb->max_slots);
status = -EINVAL;
goto bail;
}
mlog(0, "max_slots for this device: %u\n", osb->max_slots);
init_waitqueue_head(&osb->osb_wipe_event);
osb->osb_orphan_wipes = kcalloc(osb->max_slots,
sizeof(*osb->osb_orphan_wipes),
GFP_KERNEL);
if (!osb->osb_orphan_wipes) {
status = -ENOMEM;
mlog_errno(status);
goto bail;
}
osb->s_feature_compat =
le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
osb->s_feature_ro_compat =
le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
osb->s_feature_incompat =
le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
mlog(ML_ERROR, "couldn't mount because of unsupported "
"optional features (%x).\n", i);
status = -EINVAL;
goto bail;
}
if (!(osb->sb->s_flags & MS_RDONLY) &&
(i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
mlog(ML_ERROR, "couldn't mount RDWR because of "
"unsupported optional features (%x).\n", i);
status = -EINVAL;
goto bail;
}
if (ocfs2_userspace_stack(osb)) {
memcpy(osb->osb_cluster_stack,
OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
OCFS2_STACK_LABEL_LEN);
osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
mlog(ML_ERROR,
"couldn't mount because of an invalid "
"cluster stack label (%s) \n",
osb->osb_cluster_stack);
status = -EINVAL;
goto bail;
}
} else {
/* The empty string is identical with classic tools that
* don't know about s_cluster_info. */
osb->osb_cluster_stack[0] = '\0';
}
get_random_bytes(&osb->s_next_generation, sizeof(u32));
/* FIXME
* This should be done in ocfs2_journal_init(), but unknown
* ordering issues will cause the filesystem to crash.
* If anyone wants to figure out what part of the code
* refers to osb->journal before ocfs2_journal_init() is run,
* be my guest.
*/
/* initialize our journal structure */
journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
if (!journal) {
mlog(ML_ERROR, "unable to alloc journal\n");
status = -ENOMEM;
goto bail;
}
osb->journal = journal;
journal->j_osb = osb;
atomic_set(&journal->j_num_trans, 0);
init_rwsem(&journal->j_trans_barrier);
init_waitqueue_head(&journal->j_checkpointed);
spin_lock_init(&journal->j_lock);
journal->j_trans_id = (unsigned long) 1;
INIT_LIST_HEAD(&journal->j_la_cleanups);
INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
journal->j_state = OCFS2_JOURNAL_FREE;
/* get some pseudo constants for clustersize bits */
osb->s_clustersize_bits =
le32_to_cpu(di->id2.i_super.s_clustersize_bits);
osb->s_clustersize = 1 << osb->s_clustersize_bits;
mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
osb->s_clustersize);
status = -EINVAL;
goto bail;
}
if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
> (u32)~0UL) {
mlog(ML_ERROR, "Volume might try to write to blocks beyond "
"what jbd can address in 32 bits.\n");
status = -EINVAL;
goto bail;
}
if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
sizeof(di->id2.i_super.s_uuid))) {
mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
status = -ENOMEM;
goto bail;
}
memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
osb->vol_label[63] = '\0';
osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
osb->first_cluster_group_blkno =
le64_to_cpu(di->id2.i_super.s_first_cluster_group);
osb->fs_generation = le32_to_cpu(di->i_fs_generation);
mlog(0, "vol_label: %s\n", osb->vol_label);
mlog(0, "uuid: %s\n", osb->uuid_str);
mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
(unsigned long long)osb->root_blkno,
(unsigned long long)osb->system_dir_blkno);
osb->osb_dlm_debug = ocfs2_new_dlm_debug();
if (!osb->osb_dlm_debug) {
status = -ENOMEM;
mlog_errno(status);
goto bail;
}
atomic_set(&osb->vol_state, VOLUME_INIT);
/* load root, system_dir, and all global system inodes */
status = ocfs2_init_global_system_inodes(osb);
if (status < 0) {
mlog_errno(status);
goto bail;
}
/*
* global bitmap
*/
inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
OCFS2_INVALID_SLOT);
if (!inode) {
status = -EINVAL;
mlog_errno(status);
goto bail;
}
osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
iput(inode);
osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
status = ocfs2_init_slot_info(osb);
if (status < 0) {
mlog_errno(status);
goto bail;
}
bail:
mlog_exit(status);
return status;
}
/*
* will return: -EAGAIN if it is ok to keep searching for superblocks
* -EINVAL if there is a bad superblock
* 0 on success
*/
static int ocfs2_verify_volume(struct ocfs2_dinode *di,
struct buffer_head *bh,
u32 blksz)
{
int status = -EAGAIN;
mlog_entry_void();
if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
status = -EINVAL;
if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
mlog(ML_ERROR, "found superblock with incorrect block "
"size: found %u, should be %u\n",
1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
blksz);
} else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
OCFS2_MAJOR_REV_LEVEL ||
le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
OCFS2_MINOR_REV_LEVEL) {
mlog(ML_ERROR, "found superblock with bad version: "
"found %u.%u, should be %u.%u\n",
le16_to_cpu(di->id2.i_super.s_major_rev_level),
le16_to_cpu(di->id2.i_super.s_minor_rev_level),
OCFS2_MAJOR_REV_LEVEL,
OCFS2_MINOR_REV_LEVEL);
} else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
mlog(ML_ERROR, "bad block number on superblock: "
"found %llu, should be %llu\n",
(unsigned long long)le64_to_cpu(di->i_blkno),
(unsigned long long)bh->b_blocknr);
} else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
mlog(ML_ERROR, "bad cluster size found: %u\n",
1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
} else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
mlog(ML_ERROR, "bad root_blkno: 0\n");
} else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
} else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
mlog(ML_ERROR,
"Superblock slots found greater than file system "
"maximum: found %u, max %u\n",
le16_to_cpu(di->id2.i_super.s_max_slots),
OCFS2_MAX_SLOTS);
} else {
/* found it! */
status = 0;
}
}
mlog_exit(status);
return status;
}
static int ocfs2_check_volume(struct ocfs2_super *osb)
{
int status;
int dirty;
int local;
struct ocfs2_dinode *local_alloc = NULL; /* only used if we
* recover
* ourselves. */
mlog_entry_void();
/* Init our journal object. */
status = ocfs2_journal_init(osb->journal, &dirty);
if (status < 0) {
mlog(ML_ERROR, "Could not initialize journal!\n");
goto finally;
}
/* If the journal was unmounted cleanly then we don't want to
* recover anything. Otherwise, journal_load will do that
* dirty work for us :) */
if (!dirty) {
status = ocfs2_journal_wipe(osb->journal, 0);
if (status < 0) {
mlog_errno(status);
goto finally;
}
} else {
mlog(ML_NOTICE, "File system was not unmounted cleanly, "
"recovering volume.\n");
}
local = ocfs2_mount_local(osb);
/* will play back anything left in the journal. */
ocfs2_journal_load(osb->journal, local);
if (dirty) {
/* recover my local alloc if we didn't unmount cleanly. */
status = ocfs2_begin_local_alloc_recovery(osb,
osb->slot_num,
&local_alloc);
if (status < 0) {
mlog_errno(status);
goto finally;
}
/* we complete the recovery process after we've marked
* ourselves as mounted. */
}
mlog(0, "Journal loaded.\n");
status = ocfs2_load_local_alloc(osb);
if (status < 0) {
mlog_errno(status);
goto finally;
}
if (dirty) {
/* Recovery will be completed after we've mounted the
* rest of the volume. */
osb->dirty = 1;
osb->local_alloc_copy = local_alloc;
local_alloc = NULL;
}
/* go through each journal, trylock it and if you get the
* lock, and it's marked as dirty, set the bit in the recover
* map and launch a recovery thread for it. */
status = ocfs2_mark_dead_nodes(osb);
if (status < 0)
mlog_errno(status);
finally:
if (local_alloc)
kfree(local_alloc);
mlog_exit(status);
return status;
}
/*
* The routine gets called from dismount or close whenever a dismount on
* volume is requested and the osb open count becomes 1.
* It will remove the osb from the global list and also free up all the
* initialized resources and fileobject.
*/
static void ocfs2_delete_osb(struct ocfs2_super *osb)
{
mlog_entry_void();
/* This function assumes that the caller has the main osb resource */
ocfs2_free_slot_info(osb);
kfree(osb->osb_orphan_wipes);
/* FIXME
* This belongs in journal shutdown, but because we have to
* allocate osb->journal at the start of ocfs2_initalize_osb(),
* we free it here.
*/
kfree(osb->journal);
if (osb->local_alloc_copy)
kfree(osb->local_alloc_copy);
kfree(osb->uuid_str);
ocfs2_put_dlm_debug(osb->osb_dlm_debug);
memset(osb, 0, sizeof(struct ocfs2_super));
mlog_exit_void();
}
/* Put OCFS2 into a readonly state, or (if the user specifies it),
* panic(). We do not support continue-on-error operation. */
static void ocfs2_handle_error(struct super_block *sb)
{
struct ocfs2_super *osb = OCFS2_SB(sb);
if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
panic("OCFS2: (device %s): panic forced after error\n",
sb->s_id);
ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
if (sb->s_flags & MS_RDONLY &&
(ocfs2_is_soft_readonly(osb) ||
ocfs2_is_hard_readonly(osb)))
return;
printk(KERN_CRIT "File system is now read-only due to the potential "
"of on-disk corruption. Please run fsck.ocfs2 once the file "
"system is unmounted.\n");
sb->s_flags |= MS_RDONLY;
ocfs2_set_ro_flag(osb, 0);
}
static char error_buf[1024];
void __ocfs2_error(struct super_block *sb,
const char *function,
const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
vsnprintf(error_buf, sizeof(error_buf), fmt, args);
va_end(args);
/* Not using mlog here because we want to show the actual
* function the error came from. */
printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
sb->s_id, function, error_buf);
ocfs2_handle_error(sb);
}
/* Handle critical errors. This is intentionally more drastic than
* ocfs2_handle_error, so we only use for things like journal errors,
* etc. */
void __ocfs2_abort(struct super_block* sb,
const char *function,
const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
vsnprintf(error_buf, sizeof(error_buf), fmt, args);
va_end(args);
printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
sb->s_id, function, error_buf);
/* We don't have the cluster support yet to go straight to
* hard readonly in here. Until then, we want to keep
* ocfs2_abort() so that we can at least mark critical
* errors.
*
* TODO: This should abort the journal and alert other nodes
* that our slot needs recovery. */
/* Force a panic(). This stinks, but it's better than letting
* things continue without having a proper hard readonly
* here. */
OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
ocfs2_handle_error(sb);
}
module_init(ocfs2_init);
module_exit(ocfs2_exit);
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