fs/freevxfs/vxfs_super.c - third_party/kernel - Git at Google

 /*
  * 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_free_inode(struct inode *inode)
 {
 	kmem_cache_free(vxfs_inode_cachep, VXFS_INO(inode));
 }

 static const struct super_operations vxfs_super_ops = {
 	.alloc_inode		= vxfs_alloc_inode,
 	.free_inode		= vxfs_free_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;
 	sbp->s_time_min = 0;
 	sbp->s_time_max = U32_MAX;

 	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_usercopy("vxfs_inode",
 			sizeof(struct vxfs_inode_info), 0,
 			SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
 			offsetof(struct vxfs_inode_info, vii_immed.vi_immed),
 			sizeof_field(struct vxfs_inode_info,
 				vii_immed.vi_immed),
 			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);
	/*
	* 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_free_inode(struct inode *inode)
	{
	kmem_cache_free(vxfs_inode_cachep, VXFS_INO(inode));
	}

	static const struct super_operations vxfs_super_ops = {
	.alloc_inode = vxfs_alloc_inode,
	.free_inode = vxfs_free_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;
	sbp->s_time_min = 0;
	sbp->s_time_max = U32_MAX;

	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_usercopy("vxfs_inode",
	sizeof(struct vxfs_inode_info), 0,
	SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD,
	offsetof(struct vxfs_inode_info, vii_immed.vi_immed),
	sizeof_field(struct vxfs_inode_info,
	vii_immed.vi_immed),
	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);