[net-next-2.6.git] / fs / freevxfs / vxfs_super.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 = {
	.evict_inode =		vxfs_evict_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 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;
	struct buffer_head	*bp = NULL;
	u_long			bsize;
	struct inode *root;
	int ret = -EINVAL;

	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 = vxfs_iget(sbp, VXFS_ROOT_INO);
	if (IS_ERR(root)) {
		ret = PTR_ERR(root);
		goto out;
	}
	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 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,
};

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);
	kmem_cache_destroy(vxfs_inode_cachep);
}

module_init(vxfs_init);
module_exit(vxfs_cleanup);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (c) 2000-2001 Christoph Hellwig.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions, and the following disclaimer,
	10	* without modification.
	11	* 2. The name of the author may not be used to endorse or promote products
	12	* derived from this software without specific prior written permission.
	13	*
	14	* Alternatively, this software may be distributed under the terms of the
	15	* GNU General Public License ("GPL").
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
	21	* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*/
	29
	30	/*
	31	* Veritas filesystem driver - superblock related routines.
	32	*/
	33	#include <linux/init.h>
	34	#include <linux/module.h>
	35
	36	#include <linux/blkdev.h>
	37	#include <linux/fs.h>
	38	#include <linux/buffer_head.h>
	39	#include <linux/kernel.h>
	40	#include <linux/slab.h>
	41	#include <linux/stat.h>
	42	#include <linux/vfs.h>
726c3342	43	#include <linux/mount.h>
1da177e4 LT	44
	45	#include "vxfs.h"
	46	#include "vxfs_extern.h"
	47	#include "vxfs_dir.h"
	48	#include "vxfs_inode.h"
	49
	50
	51	MODULE_AUTHOR("Christoph Hellwig");
	52	MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
	53	MODULE_LICENSE("Dual BSD/GPL");
	54
	55	MODULE_ALIAS("vxfs"); /* makes mount -t vxfs autoload the module */
	56
	57
	58	static void vxfs_put_super(struct super_block *);
726c3342	59	static int vxfs_statfs(struct dentry , struct kstatfs );
1da177e4 LT	60	static int vxfs_remount(struct super_block , int , char *);
1da177e4 LT	61
ee9b6d61	62	static const struct super_operations vxfs_super_ops = {
b57922d9	63	.evict_inode = vxfs_evict_inode,
1da177e4 LT	64	.put_super = vxfs_put_super,
	65	.statfs = vxfs_statfs,
	66	.remount_fs = vxfs_remount,
	67	};
	68
	69	/**
	70	* vxfs_put_super - free superblock resources
	71	* @sbp: VFS superblock.
	72	*
	73	* Description:
	74	* vxfs_put_super frees all resources allocated for @sbp
	75	* after the last instance of the filesystem is unmounted.
	76	*/
	77
	78	static void
	79	vxfs_put_super(struct super_block *sbp)
	80	{
	81	struct vxfs_sb_info *infp = VXFS_SBI(sbp);
	82
	83	vxfs_put_fake_inode(infp->vsi_fship);
	84	vxfs_put_fake_inode(infp->vsi_ilist);
	85	vxfs_put_fake_inode(infp->vsi_stilist);
	86
	87	brelse(infp->vsi_bp);
	88	kfree(infp);
	89	}
	90
	91	/**
	92	* vxfs_statfs - get filesystem information
726c3342	93	* @dentry: VFS dentry to locate superblock
1da177e4 LT	94	* @bufp: output buffer
	95	*
	96	* Description:
	97	* vxfs_statfs fills the statfs buffer @bufp with information
726c3342	98	* about the filesystem described by @dentry.
1da177e4 LT	99	*
	100	* Returns:
	101	* Zero.
	102	*
	103	* Locking:
	104	* No locks held.
	105	*
	106	* Notes:
	107	* This is everything but complete...
	108	*/
	109	static int
726c3342	110	vxfs_statfs(struct dentry dentry, struct kstatfs bufp)
1da177e4	111	{
726c3342	112	struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
1da177e4 LT	113
1da177e4 LT	114	bufp->f_type = VXFS_SUPER_MAGIC;
726c3342	115	bufp->f_bsize = dentry->d_sb->s_blocksize;
1da177e4 LT	116	bufp->f_blocks = infp->vsi_raw->vs_dsize;
	117	bufp->f_bfree = infp->vsi_raw->vs_free;
	118	bufp->f_bavail = 0;
	119	bufp->f_files = 0;
	120	bufp->f_ffree = infp->vsi_raw->vs_ifree;
	121	bufp->f_namelen = VXFS_NAMELEN;
	122
	123	return 0;
	124	}
	125
	126	static int vxfs_remount(struct super_block sb, int flags, char *data)
	127	{
	128	*flags \|= MS_RDONLY;
	129	return 0;
	130	}
	131
	132	/**
421f91d2	133	* vxfs_read_super - read superblock into memory and initialize filesystem
1da177e4 LT	134	* @sbp: VFS superblock (to fill)
	135	* @dp: fs private mount data
	136	* @silent: do not complain loudly when sth is wrong
	137	*
	138	* Description:
	139	* We are called on the first mount of a filesystem to read the
	140	* superblock into memory and do some basic setup.
	141	*
	142	* Returns:
	143	* The superblock on success, else %NULL.
	144	*
	145	* Locking:
db719222	146	* We are under @sbp->s_lock.
1da177e4 LT	147	*/
	148	static int vxfs_fill_super(struct super_block sbp, void dp, int silent)
	149	{
	150	struct vxfs_sb_info *infp;
	151	struct vxfs_sb *rsbp;
	152	struct buffer_head *bp = NULL;
	153	u_long bsize;
	154	struct inode *root;
d0b07948	155	int ret = -EINVAL;
1da177e4 LT	156
	157	sbp->s_flags \|= MS_RDONLY;
	158
e915fc49	159	infp = kzalloc(sizeof(*infp), GFP_KERNEL);
1da177e4 LT	160	if (!infp) {
	161	printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
	162	return -ENOMEM;
	163	}
1da177e4 LT	164
	165	bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
	166	if (!bsize) {
	167	printk(KERN_WARNING "vxfs: unable to set blocksize\n");
	168	goto out;
	169	}
	170
	171	bp = sb_bread(sbp, 1);
	172	if (!bp \|\| !buffer_mapped(bp)) {
	173	if (!silent) {
	174	printk(KERN_WARNING
	175	"vxfs: unable to read disk superblock\n");
	176	}
	177	goto out;
	178	}
	179
	180	rsbp = (struct vxfs_sb *)bp->b_data;
	181	if (rsbp->vs_magic != VXFS_SUPER_MAGIC) {
	182	if (!silent)
	183	printk(KERN_NOTICE "vxfs: WRONG superblock magic\n");
	184	goto out;
	185	}
	186
	187	if ((rsbp->vs_version < 2 \|\| rsbp->vs_version > 4) && !silent) {
	188	printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n",
	189	rsbp->vs_version);
	190	goto out;
	191	}
	192
	193	#ifdef DIAGNOSTIC
	194	printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", rsbp->vs_version);
	195	printk(KERN_DEBUG "vxfs: blocksize: %d\n", rsbp->vs_bsize);
	196	#endif
	197
	198	sbp->s_magic = rsbp->vs_magic;
8cb681b9	199	sbp->s_fs_info = infp;
1da177e4 LT	200
	201	infp->vsi_raw = rsbp;
	202	infp->vsi_bp = bp;
	203	infp->vsi_oltext = rsbp->vs_oltext[0];
	204	infp->vsi_oltsize = rsbp->vs_oltsize;
	205
	206	if (!sb_set_blocksize(sbp, rsbp->vs_bsize)) {
	207	printk(KERN_WARNING "vxfs: unable to set final block size\n");
	208	goto out;
	209	}
	210
	211	if (vxfs_read_olt(sbp, bsize)) {
	212	printk(KERN_WARNING "vxfs: unable to read olt\n");
	213	goto out;
	214	}
	215
	216	if (vxfs_read_fshead(sbp)) {
	217	printk(KERN_WARNING "vxfs: unable to read fshead\n");
	218	goto out;
	219	}
	220
	221	sbp->s_op = &vxfs_super_ops;
d0b07948 DH	222	root = vxfs_iget(sbp, VXFS_ROOT_INO);
	223	if (IS_ERR(root)) {
	224	ret = PTR_ERR(root);
	225	goto out;
	226	}
1da177e4 LT	227	sbp->s_root = d_alloc_root(root);
	228	if (!sbp->s_root) {
	229	iput(root);
	230	printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
	231	goto out_free_ilist;
	232	}
	233
	234	return 0;
	235
	236	out_free_ilist:
	237	vxfs_put_fake_inode(infp->vsi_fship);
	238	vxfs_put_fake_inode(infp->vsi_ilist);
	239	vxfs_put_fake_inode(infp->vsi_stilist);
	240	out:
	241	brelse(bp);
	242	kfree(infp);
d0b07948	243	return ret;
1da177e4 LT	244	}
	245
	246	/*
	247	* The usual module blurb.
	248	*/
152a0836 AV	249	static struct dentry vxfs_mount(struct file_system_type fs_type,
152a0836 AV	250	int flags, const char dev_name, void data)
1da177e4	251	{
152a0836	252	return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
1da177e4 LT	253	}
	254
	255	static struct file_system_type vxfs_fs_type = {
	256	.owner = THIS_MODULE,
	257	.name = "vxfs",
152a0836	258	.mount = vxfs_mount,
1da177e4 LT	259	.kill_sb = kill_block_super,
	260	.fs_flags = FS_REQUIRES_DEV,
	261	};
	262
	263	static int __init
	264	vxfs_init(void)
	265	{
a4376e13 AD	266	int rv;
a4376e13 AD	267
1da177e4	268	vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
20c2df83 PM	269	sizeof(struct vxfs_inode_info), 0,
20c2df83 PM	270	SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD, NULL);
a4376e13 AD	271	if (!vxfs_inode_cachep)
	272	return -ENOMEM;
	273	rv = register_filesystem(&vxfs_fs_type);
	274	if (rv < 0)
	275	kmem_cache_destroy(vxfs_inode_cachep);
	276	return rv;
1da177e4 LT	277	}
	278
	279	static void __exit
	280	vxfs_cleanup(void)
	281	{
	282	unregister_filesystem(&vxfs_fs_type);
	283	kmem_cache_destroy(vxfs_inode_cachep);
	284	}
	285
	286	module_init(vxfs_init);
	287	module_exit(vxfs_cleanup);