swh:1:snp:c2847dfd741eae21606027cf29250d1ebcd63fb4
Tip revision: cbd9c883696da72b2b1f03f909dbacc04bbf8b58 authored by Linus Torvalds on 16 January 2008, 04:22:48 UTC
Linux 2.6.24-rc8
Linux 2.6.24-rc8
Tip revision: cbd9c88
ops_fstype.c
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License version 2.
*/
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/blkdev.h>
#include <linux/kthread.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include "gfs2.h"
#include "incore.h"
#include "daemon.h"
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "lm.h"
#include "mount.h"
#include "ops_fstype.h"
#include "ops_dentry.h"
#include "ops_super.h"
#include "recovery.h"
#include "rgrp.h"
#include "super.h"
#include "sys.h"
#include "util.h"
#include "log.h"
#define DO 0
#define UNDO 1
static struct gfs2_sbd *init_sbd(struct super_block *sb)
{
struct gfs2_sbd *sdp;
sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
if (!sdp)
return NULL;
sb->s_fs_info = sdp;
sdp->sd_vfs = sb;
gfs2_tune_init(&sdp->sd_tune);
INIT_LIST_HEAD(&sdp->sd_reclaim_list);
spin_lock_init(&sdp->sd_reclaim_lock);
init_waitqueue_head(&sdp->sd_reclaim_wq);
mutex_init(&sdp->sd_inum_mutex);
spin_lock_init(&sdp->sd_statfs_spin);
mutex_init(&sdp->sd_statfs_mutex);
spin_lock_init(&sdp->sd_rindex_spin);
mutex_init(&sdp->sd_rindex_mutex);
INIT_LIST_HEAD(&sdp->sd_rindex_list);
INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
INIT_LIST_HEAD(&sdp->sd_rindex_recent_list);
INIT_LIST_HEAD(&sdp->sd_jindex_list);
spin_lock_init(&sdp->sd_jindex_spin);
mutex_init(&sdp->sd_jindex_mutex);
INIT_LIST_HEAD(&sdp->sd_quota_list);
spin_lock_init(&sdp->sd_quota_spin);
mutex_init(&sdp->sd_quota_mutex);
spin_lock_init(&sdp->sd_log_lock);
INIT_LIST_HEAD(&sdp->sd_log_le_gl);
INIT_LIST_HEAD(&sdp->sd_log_le_buf);
INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
INIT_LIST_HEAD(&sdp->sd_log_le_rg);
INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
mutex_init(&sdp->sd_log_reserve_mutex);
INIT_LIST_HEAD(&sdp->sd_ail1_list);
INIT_LIST_HEAD(&sdp->sd_ail2_list);
init_rwsem(&sdp->sd_log_flush_lock);
atomic_set(&sdp->sd_log_in_flight, 0);
init_waitqueue_head(&sdp->sd_log_flush_wait);
INIT_LIST_HEAD(&sdp->sd_revoke_list);
mutex_init(&sdp->sd_freeze_lock);
return sdp;
}
static void init_vfs(struct super_block *sb, unsigned noatime)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
sb->s_magic = GFS2_MAGIC;
sb->s_op = &gfs2_super_ops;
sb->s_export_op = &gfs2_export_ops;
sb->s_time_gran = 1;
sb->s_maxbytes = MAX_LFS_FILESIZE;
if (sb->s_flags & (MS_NOATIME | MS_NODIRATIME))
set_bit(noatime, &sdp->sd_flags);
/* Don't let the VFS update atimes. GFS2 handles this itself. */
sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
}
static int init_names(struct gfs2_sbd *sdp, int silent)
{
char *proto, *table;
int error = 0;
proto = sdp->sd_args.ar_lockproto;
table = sdp->sd_args.ar_locktable;
/* Try to autodetect */
if (!proto[0] || !table[0]) {
error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
if (error)
return error;
error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
if (error)
goto out;
if (!proto[0])
proto = sdp->sd_sb.sb_lockproto;
if (!table[0])
table = sdp->sd_sb.sb_locktable;
}
if (!table[0])
table = sdp->sd_vfs->s_id;
snprintf(sdp->sd_proto_name, GFS2_FSNAME_LEN, "%s", proto);
snprintf(sdp->sd_table_name, GFS2_FSNAME_LEN, "%s", table);
table = sdp->sd_table_name;
while ((table = strchr(table, '/')))
*table = '_';
out:
return error;
}
static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
int undo)
{
struct task_struct *p;
int error = 0;
if (undo)
goto fail_trans;
for (sdp->sd_glockd_num = 0;
sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
sdp->sd_glockd_num++) {
p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
error = IS_ERR(p);
if (error) {
fs_err(sdp, "can't start glockd thread: %d\n", error);
goto fail;
}
sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
}
error = gfs2_glock_nq_num(sdp,
GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
mount_gh);
if (error) {
fs_err(sdp, "can't acquire mount glock: %d\n", error);
goto fail;
}
error = gfs2_glock_nq_num(sdp,
GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
LM_ST_SHARED,
LM_FLAG_NOEXP | GL_EXACT,
&sdp->sd_live_gh);
if (error) {
fs_err(sdp, "can't acquire live glock: %d\n", error);
goto fail_mount;
}
error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
CREATE, &sdp->sd_rename_gl);
if (error) {
fs_err(sdp, "can't create rename glock: %d\n", error);
goto fail_live;
}
error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
CREATE, &sdp->sd_trans_gl);
if (error) {
fs_err(sdp, "can't create transaction glock: %d\n", error);
goto fail_rename;
}
set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
return 0;
fail_trans:
gfs2_glock_put(sdp->sd_trans_gl);
fail_rename:
gfs2_glock_put(sdp->sd_rename_gl);
fail_live:
gfs2_glock_dq_uninit(&sdp->sd_live_gh);
fail_mount:
gfs2_glock_dq_uninit(mount_gh);
fail:
while (sdp->sd_glockd_num--)
kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
return error;
}
static inline struct inode *gfs2_lookup_root(struct super_block *sb,
u64 no_addr)
{
return gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
}
static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
{
struct super_block *sb = sdp->sd_vfs;
struct gfs2_holder sb_gh;
u64 no_addr;
struct inode *inode;
int error = 0;
if (undo) {
if (sb->s_root) {
dput(sb->s_root);
sb->s_root = NULL;
}
return 0;
}
error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
LM_ST_SHARED, 0, &sb_gh);
if (error) {
fs_err(sdp, "can't acquire superblock glock: %d\n", error);
return error;
}
error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
if (error) {
fs_err(sdp, "can't read superblock: %d\n", error);
goto out;
}
/* Set up the buffer cache and SB for real */
if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
error = -EINVAL;
fs_err(sdp, "FS block size (%u) is too small for device "
"block size (%u)\n",
sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
goto out;
}
if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
error = -EINVAL;
fs_err(sdp, "FS block size (%u) is too big for machine "
"page size (%u)\n",
sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
goto out;
}
sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
/* Get the root inode */
no_addr = sdp->sd_sb.sb_root_dir.no_addr;
if (sb->s_type == &gfs2meta_fs_type)
no_addr = sdp->sd_sb.sb_master_dir.no_addr;
inode = gfs2_lookup_root(sb, no_addr);
if (IS_ERR(inode)) {
error = PTR_ERR(inode);
fs_err(sdp, "can't read in root inode: %d\n", error);
goto out;
}
sb->s_root = d_alloc_root(inode);
if (!sb->s_root) {
fs_err(sdp, "can't get root dentry\n");
error = -ENOMEM;
iput(inode);
} else
sb->s_root->d_op = &gfs2_dops;
out:
gfs2_glock_dq_uninit(&sb_gh);
return error;
}
static int init_journal(struct gfs2_sbd *sdp, int undo)
{
struct gfs2_holder ji_gh;
struct task_struct *p;
struct gfs2_inode *ip;
int jindex = 1;
int error = 0;
if (undo) {
jindex = 0;
goto fail_recoverd;
}
sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
if (IS_ERR(sdp->sd_jindex)) {
fs_err(sdp, "can't lookup journal index: %d\n", error);
return PTR_ERR(sdp->sd_jindex);
}
ip = GFS2_I(sdp->sd_jindex);
set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
/* Load in the journal index special file */
error = gfs2_jindex_hold(sdp, &ji_gh);
if (error) {
fs_err(sdp, "can't read journal index: %d\n", error);
goto fail;
}
error = -EINVAL;
if (!gfs2_jindex_size(sdp)) {
fs_err(sdp, "no journals!\n");
goto fail_jindex;
}
if (sdp->sd_args.ar_spectator) {
sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
} else {
if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
fs_err(sdp, "can't mount journal #%u\n",
sdp->sd_lockstruct.ls_jid);
fs_err(sdp, "there are only %u journals (0 - %u)\n",
gfs2_jindex_size(sdp),
gfs2_jindex_size(sdp) - 1);
goto fail_jindex;
}
sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
&gfs2_journal_glops,
LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
&sdp->sd_journal_gh);
if (error) {
fs_err(sdp, "can't acquire journal glock: %d\n", error);
goto fail_jindex;
}
ip = GFS2_I(sdp->sd_jdesc->jd_inode);
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
&sdp->sd_jinode_gh);
if (error) {
fs_err(sdp, "can't acquire journal inode glock: %d\n",
error);
goto fail_journal_gh;
}
error = gfs2_jdesc_check(sdp->sd_jdesc);
if (error) {
fs_err(sdp, "my journal (%u) is bad: %d\n",
sdp->sd_jdesc->jd_jid, error);
goto fail_jinode_gh;
}
sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
}
if (sdp->sd_lockstruct.ls_first) {
unsigned int x;
for (x = 0; x < sdp->sd_journals; x++) {
error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
if (error) {
fs_err(sdp, "error recovering journal %u: %d\n",
x, error);
goto fail_jinode_gh;
}
}
gfs2_lm_others_may_mount(sdp);
} else if (!sdp->sd_args.ar_spectator) {
error = gfs2_recover_journal(sdp->sd_jdesc);
if (error) {
fs_err(sdp, "error recovering my journal: %d\n", error);
goto fail_jinode_gh;
}
}
set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
gfs2_glock_dq_uninit(&ji_gh);
jindex = 0;
p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
error = IS_ERR(p);
if (error) {
fs_err(sdp, "can't start recoverd thread: %d\n", error);
goto fail_jinode_gh;
}
sdp->sd_recoverd_process = p;
return 0;
fail_recoverd:
kthread_stop(sdp->sd_recoverd_process);
fail_jinode_gh:
if (!sdp->sd_args.ar_spectator)
gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
fail_journal_gh:
if (!sdp->sd_args.ar_spectator)
gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
fail_jindex:
gfs2_jindex_free(sdp);
if (jindex)
gfs2_glock_dq_uninit(&ji_gh);
fail:
iput(sdp->sd_jindex);
return error;
}
static int init_inodes(struct gfs2_sbd *sdp, int undo)
{
int error = 0;
struct gfs2_inode *ip;
struct inode *inode;
if (undo)
goto fail_qinode;
inode = gfs2_lookup_root(sdp->sd_vfs, sdp->sd_sb.sb_master_dir.no_addr);
if (IS_ERR(inode)) {
error = PTR_ERR(inode);
fs_err(sdp, "can't read in master directory: %d\n", error);
goto fail;
}
sdp->sd_master_dir = inode;
error = init_journal(sdp, undo);
if (error)
goto fail_master;
/* Read in the master inode number inode */
sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
if (IS_ERR(sdp->sd_inum_inode)) {
error = PTR_ERR(sdp->sd_inum_inode);
fs_err(sdp, "can't read in inum inode: %d\n", error);
goto fail_journal;
}
/* Read in the master statfs inode */
sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
if (IS_ERR(sdp->sd_statfs_inode)) {
error = PTR_ERR(sdp->sd_statfs_inode);
fs_err(sdp, "can't read in statfs inode: %d\n", error);
goto fail_inum;
}
/* Read in the resource index inode */
sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
if (IS_ERR(sdp->sd_rindex)) {
error = PTR_ERR(sdp->sd_rindex);
fs_err(sdp, "can't get resource index inode: %d\n", error);
goto fail_statfs;
}
ip = GFS2_I(sdp->sd_rindex);
set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
sdp->sd_rindex_vn = ip->i_gl->gl_vn - 1;
/* Read in the quota inode */
sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
if (IS_ERR(sdp->sd_quota_inode)) {
error = PTR_ERR(sdp->sd_quota_inode);
fs_err(sdp, "can't get quota file inode: %d\n", error);
goto fail_rindex;
}
return 0;
fail_qinode:
iput(sdp->sd_quota_inode);
fail_rindex:
gfs2_clear_rgrpd(sdp);
iput(sdp->sd_rindex);
fail_statfs:
iput(sdp->sd_statfs_inode);
fail_inum:
iput(sdp->sd_inum_inode);
fail_journal:
init_journal(sdp, UNDO);
fail_master:
iput(sdp->sd_master_dir);
fail:
return error;
}
static int init_per_node(struct gfs2_sbd *sdp, int undo)
{
struct inode *pn = NULL;
char buf[30];
int error = 0;
struct gfs2_inode *ip;
if (sdp->sd_args.ar_spectator)
return 0;
if (undo)
goto fail_qc_gh;
pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
if (IS_ERR(pn)) {
error = PTR_ERR(pn);
fs_err(sdp, "can't find per_node directory: %d\n", error);
return error;
}
sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
if (IS_ERR(sdp->sd_ir_inode)) {
error = PTR_ERR(sdp->sd_ir_inode);
fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
goto fail;
}
sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
if (IS_ERR(sdp->sd_sc_inode)) {
error = PTR_ERR(sdp->sd_sc_inode);
fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
goto fail_ir_i;
}
sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
if (IS_ERR(sdp->sd_qc_inode)) {
error = PTR_ERR(sdp->sd_qc_inode);
fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
goto fail_ut_i;
}
iput(pn);
pn = NULL;
ip = GFS2_I(sdp->sd_ir_inode);
error = gfs2_glock_nq_init(ip->i_gl,
LM_ST_EXCLUSIVE, 0,
&sdp->sd_ir_gh);
if (error) {
fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
goto fail_qc_i;
}
ip = GFS2_I(sdp->sd_sc_inode);
error = gfs2_glock_nq_init(ip->i_gl,
LM_ST_EXCLUSIVE, 0,
&sdp->sd_sc_gh);
if (error) {
fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
goto fail_ir_gh;
}
ip = GFS2_I(sdp->sd_qc_inode);
error = gfs2_glock_nq_init(ip->i_gl,
LM_ST_EXCLUSIVE, 0,
&sdp->sd_qc_gh);
if (error) {
fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
goto fail_ut_gh;
}
return 0;
fail_qc_gh:
gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
fail_ut_gh:
gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
fail_ir_gh:
gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
fail_qc_i:
iput(sdp->sd_qc_inode);
fail_ut_i:
iput(sdp->sd_sc_inode);
fail_ir_i:
iput(sdp->sd_ir_inode);
fail:
if (pn)
iput(pn);
return error;
}
static int init_threads(struct gfs2_sbd *sdp, int undo)
{
struct task_struct *p;
int error = 0;
if (undo)
goto fail_quotad;
sdp->sd_log_flush_time = jiffies;
sdp->sd_jindex_refresh_time = jiffies;
p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
error = IS_ERR(p);
if (error) {
fs_err(sdp, "can't start logd thread: %d\n", error);
return error;
}
sdp->sd_logd_process = p;
sdp->sd_statfs_sync_time = jiffies;
sdp->sd_quota_sync_time = jiffies;
p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
error = IS_ERR(p);
if (error) {
fs_err(sdp, "can't start quotad thread: %d\n", error);
goto fail;
}
sdp->sd_quotad_process = p;
return 0;
fail_quotad:
kthread_stop(sdp->sd_quotad_process);
fail:
kthread_stop(sdp->sd_logd_process);
return error;
}
/**
* fill_super - Read in superblock
* @sb: The VFS superblock
* @data: Mount options
* @silent: Don't complain if it's not a GFS2 filesystem
*
* Returns: errno
*/
static int fill_super(struct super_block *sb, void *data, int silent)
{
struct gfs2_sbd *sdp;
struct gfs2_holder mount_gh;
int error;
sdp = init_sbd(sb);
if (!sdp) {
printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
return -ENOMEM;
}
error = gfs2_mount_args(sdp, (char *)data, 0);
if (error) {
printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
goto fail;
}
init_vfs(sb, SDF_NOATIME);
/* Set up the buffer cache and fill in some fake block size values
to allow us to read-in the on-disk superblock. */
sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
GFS2_BASIC_BLOCK_SHIFT;
sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
error = init_names(sdp, silent);
if (error)
goto fail;
gfs2_create_debugfs_file(sdp);
error = gfs2_sys_fs_add(sdp);
if (error)
goto fail;
error = gfs2_lm_mount(sdp, silent);
if (error)
goto fail_sys;
error = init_locking(sdp, &mount_gh, DO);
if (error)
goto fail_lm;
error = init_sb(sdp, silent, DO);
if (error)
goto fail_locking;
error = init_inodes(sdp, DO);
if (error)
goto fail_sb;
error = init_per_node(sdp, DO);
if (error)
goto fail_inodes;
error = gfs2_statfs_init(sdp);
if (error) {
fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
goto fail_per_node;
}
error = init_threads(sdp, DO);
if (error)
goto fail_per_node;
if (!(sb->s_flags & MS_RDONLY)) {
error = gfs2_make_fs_rw(sdp);
if (error) {
fs_err(sdp, "can't make FS RW: %d\n", error);
goto fail_threads;
}
}
gfs2_glock_dq_uninit(&mount_gh);
return 0;
fail_threads:
init_threads(sdp, UNDO);
fail_per_node:
init_per_node(sdp, UNDO);
fail_inodes:
init_inodes(sdp, UNDO);
fail_sb:
init_sb(sdp, 0, UNDO);
fail_locking:
init_locking(sdp, &mount_gh, UNDO);
fail_lm:
gfs2_gl_hash_clear(sdp, WAIT);
gfs2_lm_unmount(sdp);
while (invalidate_inodes(sb))
yield();
fail_sys:
gfs2_sys_fs_del(sdp);
fail:
gfs2_delete_debugfs_file(sdp);
kfree(sdp);
sb->s_fs_info = NULL;
return error;
}
static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data, struct vfsmount *mnt)
{
struct super_block *sb;
struct gfs2_sbd *sdp;
int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
if (error)
goto out;
sb = mnt->mnt_sb;
sdp = sb->s_fs_info;
sdp->sd_gfs2mnt = mnt;
out:
return error;
}
static int fill_super_meta(struct super_block *sb, struct super_block *new,
void *data, int silent)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
struct inode *inode;
int error = 0;
new->s_fs_info = sdp;
sdp->sd_vfs_meta = sb;
init_vfs(new, SDF_NOATIME);
/* Get the master inode */
inode = igrab(sdp->sd_master_dir);
new->s_root = d_alloc_root(inode);
if (!new->s_root) {
fs_err(sdp, "can't get root dentry\n");
error = -ENOMEM;
iput(inode);
} else
new->s_root->d_op = &gfs2_dops;
return error;
}
static int set_bdev_super(struct super_block *s, void *data)
{
s->s_bdev = data;
s->s_dev = s->s_bdev->bd_dev;
return 0;
}
static int test_bdev_super(struct super_block *s, void *data)
{
return s->s_bdev == data;
}
static struct super_block* get_gfs2_sb(const char *dev_name)
{
struct kstat stat;
struct nameidata nd;
struct file_system_type *fstype;
struct super_block *sb = NULL, *s;
int error;
error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
if (error) {
printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
dev_name);
goto out;
}
error = vfs_getattr(nd.mnt, nd.dentry, &stat);
fstype = get_fs_type("gfs2");
list_for_each_entry(s, &fstype->fs_supers, s_instances) {
if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
(S_ISDIR(stat.mode) && s == nd.dentry->d_inode->i_sb)) {
sb = s;
goto free_nd;
}
}
printk(KERN_WARNING "GFS2: Unrecognized block device or "
"mount point %s\n", dev_name);
free_nd:
path_release(&nd);
out:
return sb;
}
static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data, struct vfsmount *mnt)
{
int error = 0;
struct super_block *sb = NULL, *new;
struct gfs2_sbd *sdp;
sb = get_gfs2_sb(dev_name);
if (!sb) {
printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
error = -ENOENT;
goto error;
}
sdp = sb->s_fs_info;
if (sdp->sd_vfs_meta) {
printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
error = -EBUSY;
goto error;
}
down(&sb->s_bdev->bd_mount_sem);
new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
up(&sb->s_bdev->bd_mount_sem);
if (IS_ERR(new)) {
error = PTR_ERR(new);
goto error;
}
module_put(fs_type->owner);
new->s_flags = flags;
strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
sb_set_blocksize(new, sb->s_blocksize);
error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
if (error) {
up_write(&new->s_umount);
deactivate_super(new);
goto error;
}
new->s_flags |= MS_ACTIVE;
/* Grab a reference to the gfs2 mount point */
atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
return simple_set_mnt(mnt, new);
error:
return error;
}
static void gfs2_kill_sb(struct super_block *sb)
{
if (sb->s_fs_info) {
gfs2_delete_debugfs_file(sb->s_fs_info);
gfs2_meta_syncfs(sb->s_fs_info);
}
kill_block_super(sb);
}
static void gfs2_kill_sb_meta(struct super_block *sb)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
generic_shutdown_super(sb);
sdp->sd_vfs_meta = NULL;
atomic_dec(&sdp->sd_gfs2mnt->mnt_count);
}
struct file_system_type gfs2_fs_type = {
.name = "gfs2",
.fs_flags = FS_REQUIRES_DEV,
.get_sb = gfs2_get_sb,
.kill_sb = gfs2_kill_sb,
.owner = THIS_MODULE,
};
struct file_system_type gfs2meta_fs_type = {
.name = "gfs2meta",
.fs_flags = FS_REQUIRES_DEV,
.get_sb = gfs2_get_sb_meta,
.kill_sb = gfs2_kill_sb_meta,
.owner = THIS_MODULE,
};