285 lines
7.2 KiB
C
285 lines
7.2 KiB
C
/*
|
|
* Copyright (c) 2000-2001 Christoph Hellwig.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions, and the following disclaimer,
|
|
* without modification.
|
|
* 2. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL").
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
|
|
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Veritas filesystem driver - superblock related routines.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/blkdev.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/vfs.h>
|
|
#include <linux/mount.h>
|
|
|
|
#include "vxfs.h"
|
|
#include "vxfs_extern.h"
|
|
#include "vxfs_dir.h"
|
|
#include "vxfs_inode.h"
|
|
|
|
|
|
MODULE_AUTHOR("Christoph Hellwig");
|
|
MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
|
|
MODULE_LICENSE("Dual BSD/GPL");
|
|
|
|
MODULE_ALIAS("vxfs"); /* makes mount -t vxfs autoload the module */
|
|
|
|
|
|
static void vxfs_put_super(struct super_block *);
|
|
static int vxfs_statfs(struct dentry *, struct kstatfs *);
|
|
static int vxfs_remount(struct super_block *, int *, char *);
|
|
|
|
static const struct super_operations vxfs_super_ops = {
|
|
.read_inode = vxfs_read_inode,
|
|
.clear_inode = vxfs_clear_inode,
|
|
.put_super = vxfs_put_super,
|
|
.statfs = vxfs_statfs,
|
|
.remount_fs = vxfs_remount,
|
|
};
|
|
|
|
/**
|
|
* vxfs_put_super - free superblock resources
|
|
* @sbp: VFS superblock.
|
|
*
|
|
* Description:
|
|
* vxfs_put_super frees all resources allocated for @sbp
|
|
* after the last instance of the filesystem is unmounted.
|
|
*/
|
|
|
|
static void
|
|
vxfs_put_super(struct super_block *sbp)
|
|
{
|
|
struct vxfs_sb_info *infp = VXFS_SBI(sbp);
|
|
|
|
vxfs_put_fake_inode(infp->vsi_fship);
|
|
vxfs_put_fake_inode(infp->vsi_ilist);
|
|
vxfs_put_fake_inode(infp->vsi_stilist);
|
|
|
|
brelse(infp->vsi_bp);
|
|
kfree(infp);
|
|
}
|
|
|
|
/**
|
|
* vxfs_statfs - get filesystem information
|
|
* @dentry: VFS dentry to locate superblock
|
|
* @bufp: output buffer
|
|
*
|
|
* Description:
|
|
* vxfs_statfs fills the statfs buffer @bufp with information
|
|
* about the filesystem described by @dentry.
|
|
*
|
|
* Returns:
|
|
* Zero.
|
|
*
|
|
* Locking:
|
|
* No locks held.
|
|
*
|
|
* Notes:
|
|
* This is everything but complete...
|
|
*/
|
|
static int
|
|
vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
|
|
{
|
|
struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
|
|
|
|
bufp->f_type = VXFS_SUPER_MAGIC;
|
|
bufp->f_bsize = dentry->d_sb->s_blocksize;
|
|
bufp->f_blocks = infp->vsi_raw->vs_dsize;
|
|
bufp->f_bfree = infp->vsi_raw->vs_free;
|
|
bufp->f_bavail = 0;
|
|
bufp->f_files = 0;
|
|
bufp->f_ffree = infp->vsi_raw->vs_ifree;
|
|
bufp->f_namelen = VXFS_NAMELEN;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vxfs_remount(struct super_block *sb, int *flags, char *data)
|
|
{
|
|
*flags |= MS_RDONLY;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* vxfs_read_super - read superblock into memory and initalize filesystem
|
|
* @sbp: VFS superblock (to fill)
|
|
* @dp: fs private mount data
|
|
* @silent: do not complain loudly when sth is wrong
|
|
*
|
|
* Description:
|
|
* We are called on the first mount of a filesystem to read the
|
|
* superblock into memory and do some basic setup.
|
|
*
|
|
* Returns:
|
|
* The superblock on success, else %NULL.
|
|
*
|
|
* Locking:
|
|
* We are under the bkl and @sbp->s_lock.
|
|
*/
|
|
static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
|
|
{
|
|
struct vxfs_sb_info *infp;
|
|
struct vxfs_sb *rsbp;
|
|
struct buffer_head *bp = NULL;
|
|
u_long bsize;
|
|
struct inode *root;
|
|
|
|
sbp->s_flags |= MS_RDONLY;
|
|
|
|
infp = kzalloc(sizeof(*infp), GFP_KERNEL);
|
|
if (!infp) {
|
|
printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
|
|
if (!bsize) {
|
|
printk(KERN_WARNING "vxfs: unable to set blocksize\n");
|
|
goto out;
|
|
}
|
|
|
|
bp = sb_bread(sbp, 1);
|
|
if (!bp || !buffer_mapped(bp)) {
|
|
if (!silent) {
|
|
printk(KERN_WARNING
|
|
"vxfs: unable to read disk superblock\n");
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
rsbp = (struct vxfs_sb *)bp->b_data;
|
|
if (rsbp->vs_magic != VXFS_SUPER_MAGIC) {
|
|
if (!silent)
|
|
printk(KERN_NOTICE "vxfs: WRONG superblock magic\n");
|
|
goto out;
|
|
}
|
|
|
|
if ((rsbp->vs_version < 2 || rsbp->vs_version > 4) && !silent) {
|
|
printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n",
|
|
rsbp->vs_version);
|
|
goto out;
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", rsbp->vs_version);
|
|
printk(KERN_DEBUG "vxfs: blocksize: %d\n", rsbp->vs_bsize);
|
|
#endif
|
|
|
|
sbp->s_magic = rsbp->vs_magic;
|
|
sbp->s_fs_info = infp;
|
|
|
|
infp->vsi_raw = rsbp;
|
|
infp->vsi_bp = bp;
|
|
infp->vsi_oltext = rsbp->vs_oltext[0];
|
|
infp->vsi_oltsize = rsbp->vs_oltsize;
|
|
|
|
if (!sb_set_blocksize(sbp, rsbp->vs_bsize)) {
|
|
printk(KERN_WARNING "vxfs: unable to set final block size\n");
|
|
goto out;
|
|
}
|
|
|
|
if (vxfs_read_olt(sbp, bsize)) {
|
|
printk(KERN_WARNING "vxfs: unable to read olt\n");
|
|
goto out;
|
|
}
|
|
|
|
if (vxfs_read_fshead(sbp)) {
|
|
printk(KERN_WARNING "vxfs: unable to read fshead\n");
|
|
goto out;
|
|
}
|
|
|
|
sbp->s_op = &vxfs_super_ops;
|
|
root = iget(sbp, VXFS_ROOT_INO);
|
|
sbp->s_root = d_alloc_root(root);
|
|
if (!sbp->s_root) {
|
|
iput(root);
|
|
printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
|
|
goto out_free_ilist;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_free_ilist:
|
|
vxfs_put_fake_inode(infp->vsi_fship);
|
|
vxfs_put_fake_inode(infp->vsi_ilist);
|
|
vxfs_put_fake_inode(infp->vsi_stilist);
|
|
out:
|
|
brelse(bp);
|
|
kfree(infp);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* The usual module blurb.
|
|
*/
|
|
static int vxfs_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, vxfs_fill_super,
|
|
mnt);
|
|
}
|
|
|
|
static struct file_system_type vxfs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "vxfs",
|
|
.get_sb = vxfs_get_sb,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
|
|
static int __init
|
|
vxfs_init(void)
|
|
{
|
|
int rv;
|
|
|
|
vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
|
|
sizeof(struct vxfs_inode_info), 0,
|
|
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL, NULL);
|
|
if (!vxfs_inode_cachep)
|
|
return -ENOMEM;
|
|
rv = register_filesystem(&vxfs_fs_type);
|
|
if (rv < 0)
|
|
kmem_cache_destroy(vxfs_inode_cachep);
|
|
return rv;
|
|
}
|
|
|
|
static void __exit
|
|
vxfs_cleanup(void)
|
|
{
|
|
unregister_filesystem(&vxfs_fs_type);
|
|
kmem_cache_destroy(vxfs_inode_cachep);
|
|
}
|
|
|
|
module_init(vxfs_init);
|
|
module_exit(vxfs_cleanup);
|