[mirror_ubuntu-bionic-kernel.git] / fs / freevxfs / vxfs_super.c

/*
 * Copyright (c) 2000-2001 Christoph Hellwig.
 * Copyright (c) 2016 Krzysztof Blaszkowski
 * 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, Krzysztof Blaszkowski");
MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
MODULE_LICENSE("Dual BSD/GPL");

static struct kmem_cache *vxfs_inode_cachep;

/**
 * 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);

	iput(infp->vsi_fship);
	iput(infp->vsi_ilist);
	iput(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);
	struct vxfs_sb *raw_sb = infp->vsi_raw;

	bufp->f_type = VXFS_SUPER_MAGIC;
	bufp->f_bsize = dentry->d_sb->s_blocksize;
	bufp->f_blocks = fs32_to_cpu(infp, raw_sb->vs_dsize);
	bufp->f_bfree = fs32_to_cpu(infp, raw_sb->vs_free);
	bufp->f_bavail = 0;
	bufp->f_files = 0;
	bufp->f_ffree = fs32_to_cpu(infp, raw_sb->vs_ifree);
	bufp->f_namelen = VXFS_NAMELEN;

	return 0;
}

static int vxfs_remount(struct super_block *sb, int *flags, char *data)
{
	sync_filesystem(sb);
	*flags |= SB_RDONLY;
	return 0;
}

static struct inode *vxfs_alloc_inode(struct super_block *sb)
{
	struct vxfs_inode_info *vi;

	vi = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL);
	if (!vi)
		return NULL;
	inode_init_once(&vi->vfs_inode);
	return &vi->vfs_inode;
}

static void vxfs_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);

	kmem_cache_free(vxfs_inode_cachep, VXFS_INO(inode));
}

static void vxfs_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, vxfs_i_callback);
}

static const struct super_operations vxfs_super_ops = {
	.alloc_inode		= vxfs_alloc_inode,
	.destroy_inode		= vxfs_destroy_inode,
	.evict_inode		= vxfs_evict_inode,
	.put_super		= vxfs_put_super,
	.statfs			= vxfs_statfs,
	.remount_fs		= vxfs_remount,
};

static int vxfs_try_sb_magic(struct super_block *sbp, int silent,
		unsigned blk, __fs32 magic)
{
	struct buffer_head *bp;
	struct vxfs_sb *rsbp;
	struct vxfs_sb_info *infp = VXFS_SBI(sbp);
	int rc = -ENOMEM;

	bp = sb_bread(sbp, blk);
	do {
		if (!bp || !buffer_mapped(bp)) {
			if (!silent) {
				printk(KERN_WARNING
					"vxfs: unable to read disk superblock at %u\n",
					blk);
			}
			break;
		}

		rc = -EINVAL;
		rsbp = (struct vxfs_sb *)bp->b_data;
		if (rsbp->vs_magic != magic) {
			if (!silent)
				printk(KERN_NOTICE
					"vxfs: WRONG superblock magic %08x at %u\n",
					rsbp->vs_magic, blk);
			break;
		}

		rc = 0;
		infp->vsi_raw = rsbp;
		infp->vsi_bp = bp;
	} while (0);

	if (rc) {
		infp->vsi_raw = NULL;
		infp->vsi_bp = NULL;
		brelse(bp);
	}

	return rc;
}

/**
 * vxfs_read_super - read superblock into memory and initialize 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 @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;
	u_long			bsize;
	struct inode *root;
	int ret = -EINVAL;
	u32 j;

	sbp->s_flags |= SB_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;
	}

	sbp->s_op = &vxfs_super_ops;
	sbp->s_fs_info = infp;

	if (!vxfs_try_sb_magic(sbp, silent, 1,
			(__force __fs32)cpu_to_le32(VXFS_SUPER_MAGIC))) {
		/* Unixware, x86 */
		infp->byte_order = VXFS_BO_LE;
	} else if (!vxfs_try_sb_magic(sbp, silent, 8,
			(__force __fs32)cpu_to_be32(VXFS_SUPER_MAGIC))) {
		/* HP-UX, parisc */
		infp->byte_order = VXFS_BO_BE;
	} else {
		if (!silent)
			printk(KERN_NOTICE "vxfs: can't find superblock.\n");
		goto out;
	}

	rsbp = infp->vsi_raw;
	j = fs32_to_cpu(infp, rsbp->vs_version);
	if ((j < 2 || j > 4) && !silent) {
		printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", j);
		goto out;
	}

#ifdef DIAGNOSTIC
	printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", j);
	printk(KERN_DEBUG "vxfs: blocksize: %d\n",
		fs32_to_cpu(infp, rsbp->vs_bsize));
#endif

	sbp->s_magic = fs32_to_cpu(infp, rsbp->vs_magic);

	infp->vsi_oltext = fs32_to_cpu(infp, rsbp->vs_oltext[0]);
	infp->vsi_oltsize = fs32_to_cpu(infp, rsbp->vs_oltsize);

	j = fs32_to_cpu(infp, rsbp->vs_bsize);
	if (!sb_set_blocksize(sbp, j)) {
		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;
	}

	root = vxfs_iget(sbp, VXFS_ROOT_INO);
	if (IS_ERR(root)) {
		ret = PTR_ERR(root);
		goto out;
	}
	sbp->s_root = d_make_root(root);
	if (!sbp->s_root) {
		printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
		goto out_free_ilist;
	}

	return 0;
	
out_free_ilist:
	iput(infp->vsi_fship);
	iput(infp->vsi_ilist);
	iput(infp->vsi_stilist);
out:
	brelse(infp->vsi_bp);
	kfree(infp);
	return ret;
}

/*
 * The usual module blurb.
 */
static struct dentry *vxfs_mount(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data)
{
	return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
}

static struct file_system_type vxfs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "vxfs",
	.mount		= vxfs_mount,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */
MODULE_ALIAS("vxfs");

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);
	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);
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
	kmem_cache_destroy(vxfs_inode_cachep);
}

module_init(vxfs_init);
module_exit(vxfs_cleanup);
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* Copyright (c) 2000-2001 Christoph Hellwig.
1cce1701	3	* Copyright (c) 2016 Krzysztof Blaszkowski
1da177e4 LT	4	* All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions, and the following disclaimer,
	11	* without modification.
	12	* 2. The name of the author may not be used to endorse or promote products
	13	* derived from this software without specific prior written permission.
	14	*
	15	* Alternatively, this software may be distributed under the terms of the
	16	* GNU General Public License ("GPL").
	17	*
	18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	19	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	20	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	21	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
	22	* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	23	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	24	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	25	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	26	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	27	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	28	* SUCH DAMAGE.
	29	*/
	30
	31	/*
	32	* Veritas filesystem driver - superblock related routines.
	33	*/
	34	#include <linux/init.h>
	35	#include <linux/module.h>
	36
	37	#include <linux/blkdev.h>
	38	#include <linux/fs.h>
	39	#include <linux/buffer_head.h>
	40	#include <linux/kernel.h>
	41	#include <linux/slab.h>
	42	#include <linux/stat.h>
	43	#include <linux/vfs.h>
726c3342	44	#include <linux/mount.h>
1da177e4 LT	45
	46	#include "vxfs.h"
	47	#include "vxfs_extern.h"
	48	#include "vxfs_dir.h"
	49	#include "vxfs_inode.h"
	50
	51
1cce1701	52	MODULE_AUTHOR("Christoph Hellwig, Krzysztof Blaszkowski");
1da177e4 LT	53	MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
	54	MODULE_LICENSE("Dual BSD/GPL");
	55
2f137e31 CH	56	static struct kmem_cache *vxfs_inode_cachep;
2f137e31 CH	57
1da177e4 LT	58	/**
	59	* vxfs_put_super - free superblock resources
	60	* @sbp: VFS superblock.
	61	*
	62	* Description:
	63	* vxfs_put_super frees all resources allocated for @sbp
	64	* after the last instance of the filesystem is unmounted.
	65	*/
	66
	67	static void
	68	vxfs_put_super(struct super_block *sbp)
	69	{
	70	struct vxfs_sb_info *infp = VXFS_SBI(sbp);
	71
0e481d3c KB	72	iput(infp->vsi_fship);
	73	iput(infp->vsi_ilist);
	74	iput(infp->vsi_stilist);
1da177e4 LT	75
	76	brelse(infp->vsi_bp);
	77	kfree(infp);
	78	}
	79
	80	/**
	81	* vxfs_statfs - get filesystem information
726c3342	82	* @dentry: VFS dentry to locate superblock
1da177e4 LT	83	* @bufp: output buffer
	84	*
	85	* Description:
	86	* vxfs_statfs fills the statfs buffer @bufp with information
726c3342	87	* about the filesystem described by @dentry.
1da177e4 LT	88	*
	89	* Returns:
	90	* Zero.
	91	*
	92	* Locking:
	93	* No locks held.
	94	*
	95	* Notes:
	96	* This is everything but complete...
	97	*/
	98	static int
726c3342	99	vxfs_statfs(struct dentry dentry, struct kstatfs bufp)
1da177e4	100	{
726c3342	101	struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
0d83f7fc	102	struct vxfs_sb *raw_sb = infp->vsi_raw;
1da177e4 LT	103
1da177e4 LT	104	bufp->f_type = VXFS_SUPER_MAGIC;
726c3342	105	bufp->f_bsize = dentry->d_sb->s_blocksize;
0d83f7fc KB	106	bufp->f_blocks = fs32_to_cpu(infp, raw_sb->vs_dsize);
0d83f7fc KB	107	bufp->f_bfree = fs32_to_cpu(infp, raw_sb->vs_free);
1da177e4 LT	108	bufp->f_bavail = 0;
1da177e4 LT	109	bufp->f_files = 0;
0d83f7fc	110	bufp->f_ffree = fs32_to_cpu(infp, raw_sb->vs_ifree);
1da177e4 LT	111	bufp->f_namelen = VXFS_NAMELEN;
	112
	113	return 0;
	114	}
	115
	116	static int vxfs_remount(struct super_block sb, int flags, char *data)
	117	{
02b9984d	118	sync_filesystem(sb);
1751e8a6	119	*flags \|= SB_RDONLY;
1da177e4 LT	120	return 0;
	121	}
	122
2f137e31 CH	123	static struct inode vxfs_alloc_inode(struct super_block sb)
	124	{
	125	struct vxfs_inode_info *vi;
	126
	127	vi = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL);
	128	if (!vi)
	129	return NULL;
f2fe2fa1	130	inode_init_once(&vi->vfs_inode);
2f137e31 CH	131	return &vi->vfs_inode;
	132	}
	133
	134	static void vxfs_i_callback(struct rcu_head *head)
	135	{
	136	struct inode *inode = container_of(head, struct inode, i_rcu);
	137
	138	kmem_cache_free(vxfs_inode_cachep, VXFS_INO(inode));
	139	}
	140
	141	static void vxfs_destroy_inode(struct inode *inode)
	142	{
	143	call_rcu(&inode->i_rcu, vxfs_i_callback);
	144	}
	145
f2bf2c70	146	static const struct super_operations vxfs_super_ops = {
2f137e31 CH	147	.alloc_inode = vxfs_alloc_inode,
2f137e31 CH	148	.destroy_inode = vxfs_destroy_inode,
f2bf2c70 CH	149	.evict_inode = vxfs_evict_inode,
	150	.put_super = vxfs_put_super,
	151	.statfs = vxfs_statfs,
	152	.remount_fs = vxfs_remount,
	153	};
0d83f7fc KB	154
	155	static int vxfs_try_sb_magic(struct super_block *sbp, int silent,
	156	unsigned blk, __fs32 magic)
	157	{
	158	struct buffer_head *bp;
	159	struct vxfs_sb *rsbp;
	160	struct vxfs_sb_info *infp = VXFS_SBI(sbp);
	161	int rc = -ENOMEM;
	162
	163	bp = sb_bread(sbp, blk);
	164	do {
	165	if (!bp \|\| !buffer_mapped(bp)) {
	166	if (!silent) {
	167	printk(KERN_WARNING
	168	"vxfs: unable to read disk superblock at %u\n",
	169	blk);
	170	}
	171	break;
	172	}
	173
	174	rc = -EINVAL;
	175	rsbp = (struct vxfs_sb *)bp->b_data;
	176	if (rsbp->vs_magic != magic) {
	177	if (!silent)
	178	printk(KERN_NOTICE
	179	"vxfs: WRONG superblock magic %08x at %u\n",
	180	rsbp->vs_magic, blk);
	181	break;
	182	}
	183
	184	rc = 0;
	185	infp->vsi_raw = rsbp;
	186	infp->vsi_bp = bp;
	187	} while (0);
	188
	189	if (rc) {
	190	infp->vsi_raw = NULL;
	191	infp->vsi_bp = NULL;
	192	brelse(bp);
	193	}
	194
	195	return rc;
	196	}
	197
1da177e4	198	/**
421f91d2	199	* vxfs_read_super - read superblock into memory and initialize filesystem
1da177e4 LT	200	* @sbp: VFS superblock (to fill)
	201	* @dp: fs private mount data
	202	* @silent: do not complain loudly when sth is wrong
	203	*
	204	* Description:
	205	* We are called on the first mount of a filesystem to read the
	206	* superblock into memory and do some basic setup.
	207	*
	208	* Returns:
	209	* The superblock on success, else %NULL.
	210	*
	211	* Locking:
db719222	212	* We are under @sbp->s_lock.
1da177e4 LT	213	*/
	214	static int vxfs_fill_super(struct super_block sbp, void dp, int silent)
	215	{
	216	struct vxfs_sb_info *infp;
	217	struct vxfs_sb *rsbp;
1da177e4 LT	218	u_long bsize;
1da177e4 LT	219	struct inode *root;
d0b07948	220	int ret = -EINVAL;
0d83f7fc	221	u32 j;
1da177e4	222
1751e8a6	223	sbp->s_flags \|= SB_RDONLY;
1da177e4	224
e915fc49	225	infp = kzalloc(sizeof(*infp), GFP_KERNEL);
1da177e4 LT	226	if (!infp) {
	227	printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
	228	return -ENOMEM;
	229	}
1da177e4 LT	230
	231	bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
	232	if (!bsize) {
	233	printk(KERN_WARNING "vxfs: unable to set blocksize\n");
	234	goto out;
	235	}
	236
2f137e31	237	sbp->s_op = &vxfs_super_ops;
0d83f7fc	238	sbp->s_fs_info = infp;
1da177e4	239
0d83f7fc KB	240	if (!vxfs_try_sb_magic(sbp, silent, 1,
	241	(__force __fs32)cpu_to_le32(VXFS_SUPER_MAGIC))) {
	242	/* Unixware, x86 */
	243	infp->byte_order = VXFS_BO_LE;
	244	} else if (!vxfs_try_sb_magic(sbp, silent, 8,
	245	(__force __fs32)cpu_to_be32(VXFS_SUPER_MAGIC))) {
	246	/* HP-UX, parisc */
	247	infp->byte_order = VXFS_BO_BE;
	248	} else {
1da177e4	249	if (!silent)
0d83f7fc	250	printk(KERN_NOTICE "vxfs: can't find superblock.\n");
1da177e4 LT	251	goto out;
	252	}
	253
0d83f7fc KB	254	rsbp = infp->vsi_raw;
	255	j = fs32_to_cpu(infp, rsbp->vs_version);
	256	if ((j < 2 \|\| j > 4) && !silent) {
	257	printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", j);
1da177e4 LT	258	goto out;
	259	}
	260
	261	#ifdef DIAGNOSTIC
0d83f7fc KB	262	printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", j);
	263	printk(KERN_DEBUG "vxfs: blocksize: %d\n",
	264	fs32_to_cpu(infp, rsbp->vs_bsize));
1da177e4 LT	265	#endif
1da177e4 LT	266
0d83f7fc	267	sbp->s_magic = fs32_to_cpu(infp, rsbp->vs_magic);
1da177e4	268
0d83f7fc KB	269	infp->vsi_oltext = fs32_to_cpu(infp, rsbp->vs_oltext[0]);
0d83f7fc KB	270	infp->vsi_oltsize = fs32_to_cpu(infp, rsbp->vs_oltsize);
1da177e4	271
0d83f7fc KB	272	j = fs32_to_cpu(infp, rsbp->vs_bsize);
0d83f7fc KB	273	if (!sb_set_blocksize(sbp, j)) {
1da177e4 LT	274	printk(KERN_WARNING "vxfs: unable to set final block size\n");
	275	goto out;
	276	}
	277
	278	if (vxfs_read_olt(sbp, bsize)) {
	279	printk(KERN_WARNING "vxfs: unable to read olt\n");
	280	goto out;
	281	}
	282
	283	if (vxfs_read_fshead(sbp)) {
	284	printk(KERN_WARNING "vxfs: unable to read fshead\n");
	285	goto out;
	286	}
	287
d0b07948 DH	288	root = vxfs_iget(sbp, VXFS_ROOT_INO);
	289	if (IS_ERR(root)) {
	290	ret = PTR_ERR(root);
	291	goto out;
	292	}
48fde701	293	sbp->s_root = d_make_root(root);
1da177e4	294	if (!sbp->s_root) {
1da177e4 LT	295	printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
	296	goto out_free_ilist;
	297	}
	298
	299	return 0;
	300
	301	out_free_ilist:
0e481d3c KB	302	iput(infp->vsi_fship);
	303	iput(infp->vsi_ilist);
	304	iput(infp->vsi_stilist);
1da177e4	305	out:
0d83f7fc	306	brelse(infp->vsi_bp);
1da177e4	307	kfree(infp);
d0b07948	308	return ret;
1da177e4 LT	309	}
	310
	311	/*
	312	* The usual module blurb.
	313	*/
152a0836 AV	314	static struct dentry vxfs_mount(struct file_system_type fs_type,
152a0836 AV	315	int flags, const char dev_name, void data)
1da177e4	316	{
152a0836	317	return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
1da177e4 LT	318	}
	319
	320	static struct file_system_type vxfs_fs_type = {
	321	.owner = THIS_MODULE,
	322	.name = "vxfs",
152a0836	323	.mount = vxfs_mount,
1da177e4 LT	324	.kill_sb = kill_block_super,
	325	.fs_flags = FS_REQUIRES_DEV,
	326	};
7f78e035	327	MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */
fa7614dd	328	MODULE_ALIAS("vxfs");
1da177e4 LT	329
	330	static int __init
	331	vxfs_init(void)
	332	{
a4376e13 AD	333	int rv;
a4376e13 AD	334
1da177e4	335	vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
20c2df83 PM	336	sizeof(struct vxfs_inode_info), 0,
20c2df83 PM	337	SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD, NULL);
a4376e13 AD	338	if (!vxfs_inode_cachep)
	339	return -ENOMEM;
	340	rv = register_filesystem(&vxfs_fs_type);
	341	if (rv < 0)
	342	kmem_cache_destroy(vxfs_inode_cachep);
	343	return rv;
1da177e4 LT	344	}
	345
	346	static void __exit
	347	vxfs_cleanup(void)
	348	{
	349	unregister_filesystem(&vxfs_fs_type);
8c0a8537 KS	350	/*
	351	* Make sure all delayed rcu free inodes are flushed before we
	352	* destroy cache.
	353	*/
	354	rcu_barrier();
1da177e4 LT	355	kmem_cache_destroy(vxfs_inode_cachep);
	356	}
	357
	358	module_init(vxfs_init);
	359	module_exit(vxfs_cleanup);