[linux.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/smp_lock.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 = {
	.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);

	lock_kernel();

	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);

	unlock_kernel();
}

/**
 * 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;
	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 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);
	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>
405f5571	41	#include <linux/smp_lock.h>
1da177e4 LT	42	#include <linux/stat.h>
1da177e4 LT	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
	52	MODULE_AUTHOR("Christoph Hellwig");
	53	MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
	54	MODULE_LICENSE("Dual BSD/GPL");
	55
	56	MODULE_ALIAS("vxfs"); /* makes mount -t vxfs autoload the module */
	57
	58
	59	static void vxfs_put_super(struct super_block *);
726c3342	60	static int vxfs_statfs(struct dentry , struct kstatfs );
1da177e4 LT	61	static int vxfs_remount(struct super_block , int , char *);
1da177e4 LT	62
ee9b6d61	63	static const struct super_operations vxfs_super_ops = {
1da177e4 LT	64	.clear_inode = vxfs_clear_inode,
	65	.put_super = vxfs_put_super,
	66	.statfs = vxfs_statfs,
	67	.remount_fs = vxfs_remount,
	68	};
	69
	70	/**
	71	* vxfs_put_super - free superblock resources
	72	* @sbp: VFS superblock.
	73	*
	74	* Description:
	75	* vxfs_put_super frees all resources allocated for @sbp
	76	* after the last instance of the filesystem is unmounted.
	77	*/
	78
	79	static void
	80	vxfs_put_super(struct super_block *sbp)
	81	{
	82	struct vxfs_sb_info *infp = VXFS_SBI(sbp);
	83
6cfd0148 CH	84	lock_kernel();
6cfd0148 CH	85
1da177e4 LT	86	vxfs_put_fake_inode(infp->vsi_fship);
	87	vxfs_put_fake_inode(infp->vsi_ilist);
	88	vxfs_put_fake_inode(infp->vsi_stilist);
	89
	90	brelse(infp->vsi_bp);
	91	kfree(infp);
6cfd0148 CH	92
6cfd0148 CH	93	unlock_kernel();
1da177e4 LT	94	}
	95
	96	/**
	97	* vxfs_statfs - get filesystem information
726c3342	98	* @dentry: VFS dentry to locate superblock
1da177e4 LT	99	* @bufp: output buffer
	100	*
	101	* Description:
	102	* vxfs_statfs fills the statfs buffer @bufp with information
726c3342	103	* about the filesystem described by @dentry.
1da177e4 LT	104	*
	105	* Returns:
	106	* Zero.
	107	*
	108	* Locking:
	109	* No locks held.
	110	*
	111	* Notes:
	112	* This is everything but complete...
	113	*/
	114	static int
726c3342	115	vxfs_statfs(struct dentry dentry, struct kstatfs bufp)
1da177e4	116	{
726c3342	117	struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
1da177e4 LT	118
1da177e4 LT	119	bufp->f_type = VXFS_SUPER_MAGIC;
726c3342	120	bufp->f_bsize = dentry->d_sb->s_blocksize;
1da177e4 LT	121	bufp->f_blocks = infp->vsi_raw->vs_dsize;
	122	bufp->f_bfree = infp->vsi_raw->vs_free;
	123	bufp->f_bavail = 0;
	124	bufp->f_files = 0;
	125	bufp->f_ffree = infp->vsi_raw->vs_ifree;
	126	bufp->f_namelen = VXFS_NAMELEN;
	127
	128	return 0;
	129	}
	130
	131	static int vxfs_remount(struct super_block sb, int flags, char *data)
	132	{
	133	*flags \|= MS_RDONLY;
	134	return 0;
	135	}
	136
	137	/**
	138	* vxfs_read_super - read superblock into memory and initalize filesystem
	139	* @sbp: VFS superblock (to fill)
	140	* @dp: fs private mount data
	141	* @silent: do not complain loudly when sth is wrong
	142	*
	143	* Description:
	144	* We are called on the first mount of a filesystem to read the
	145	* superblock into memory and do some basic setup.
	146	*
	147	* Returns:
	148	* The superblock on success, else %NULL.
	149	*
	150	* Locking:
	151	* We are under the bkl and @sbp->s_lock.
	152	*/
	153	static int vxfs_fill_super(struct super_block sbp, void dp, int silent)
	154	{
	155	struct vxfs_sb_info *infp;
	156	struct vxfs_sb *rsbp;
	157	struct buffer_head *bp = NULL;
	158	u_long bsize;
	159	struct inode *root;
d0b07948	160	int ret = -EINVAL;
1da177e4 LT	161
	162	sbp->s_flags \|= MS_RDONLY;
	163
e915fc49	164	infp = kzalloc(sizeof(*infp), GFP_KERNEL);
1da177e4 LT	165	if (!infp) {
	166	printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
	167	return -ENOMEM;
	168	}
1da177e4 LT	169
	170	bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
	171	if (!bsize) {
	172	printk(KERN_WARNING "vxfs: unable to set blocksize\n");
	173	goto out;
	174	}
	175
	176	bp = sb_bread(sbp, 1);
	177	if (!bp \|\| !buffer_mapped(bp)) {
	178	if (!silent) {
	179	printk(KERN_WARNING
	180	"vxfs: unable to read disk superblock\n");
	181	}
	182	goto out;
	183	}
	184
	185	rsbp = (struct vxfs_sb *)bp->b_data;
	186	if (rsbp->vs_magic != VXFS_SUPER_MAGIC) {
	187	if (!silent)
	188	printk(KERN_NOTICE "vxfs: WRONG superblock magic\n");
	189	goto out;
	190	}
	191
	192	if ((rsbp->vs_version < 2 \|\| rsbp->vs_version > 4) && !silent) {
	193	printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n",
	194	rsbp->vs_version);
	195	goto out;
	196	}
	197
	198	#ifdef DIAGNOSTIC
	199	printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", rsbp->vs_version);
	200	printk(KERN_DEBUG "vxfs: blocksize: %d\n", rsbp->vs_bsize);
	201	#endif
	202
	203	sbp->s_magic = rsbp->vs_magic;
8cb681b9	204	sbp->s_fs_info = infp;
1da177e4 LT	205
	206	infp->vsi_raw = rsbp;
	207	infp->vsi_bp = bp;
	208	infp->vsi_oltext = rsbp->vs_oltext[0];
	209	infp->vsi_oltsize = rsbp->vs_oltsize;
	210
	211	if (!sb_set_blocksize(sbp, rsbp->vs_bsize)) {
	212	printk(KERN_WARNING "vxfs: unable to set final block size\n");
	213	goto out;
	214	}
	215
	216	if (vxfs_read_olt(sbp, bsize)) {
	217	printk(KERN_WARNING "vxfs: unable to read olt\n");
	218	goto out;
	219	}
	220
	221	if (vxfs_read_fshead(sbp)) {
	222	printk(KERN_WARNING "vxfs: unable to read fshead\n");
	223	goto out;
	224	}
	225
	226	sbp->s_op = &vxfs_super_ops;
d0b07948 DH	227	root = vxfs_iget(sbp, VXFS_ROOT_INO);
	228	if (IS_ERR(root)) {
	229	ret = PTR_ERR(root);
	230	goto out;
	231	}
1da177e4 LT	232	sbp->s_root = d_alloc_root(root);
	233	if (!sbp->s_root) {
	234	iput(root);
	235	printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
	236	goto out_free_ilist;
	237	}
	238
	239	return 0;
	240
	241	out_free_ilist:
	242	vxfs_put_fake_inode(infp->vsi_fship);
	243	vxfs_put_fake_inode(infp->vsi_ilist);
	244	vxfs_put_fake_inode(infp->vsi_stilist);
	245	out:
	246	brelse(bp);
	247	kfree(infp);
d0b07948	248	return ret;
1da177e4 LT	249	}
	250
	251	/*
	252	* The usual module blurb.
	253	*/
454e2398 DH	254	static int vxfs_get_sb(struct file_system_type *fs_type,
454e2398 DH	255	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	256	{
454e2398 DH	257	return get_sb_bdev(fs_type, flags, dev_name, data, vxfs_fill_super,
454e2398 DH	258	mnt);
1da177e4 LT	259	}
	260
	261	static struct file_system_type vxfs_fs_type = {
	262	.owner = THIS_MODULE,
	263	.name = "vxfs",
	264	.get_sb = vxfs_get_sb,
	265	.kill_sb = kill_block_super,
	266	.fs_flags = FS_REQUIRES_DEV,
	267	};
	268
	269	static int __init
	270	vxfs_init(void)
	271	{
a4376e13 AD	272	int rv;
a4376e13 AD	273
1da177e4	274	vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
20c2df83 PM	275	sizeof(struct vxfs_inode_info), 0,
20c2df83 PM	276	SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD, NULL);
a4376e13 AD	277	if (!vxfs_inode_cachep)
	278	return -ENOMEM;
	279	rv = register_filesystem(&vxfs_fs_type);
	280	if (rv < 0)
	281	kmem_cache_destroy(vxfs_inode_cachep);
	282	return rv;
1da177e4 LT	283	}
	284
	285	static void __exit
	286	vxfs_cleanup(void)
	287	{
	288	unregister_filesystem(&vxfs_fs_type);
	289	kmem_cache_destroy(vxfs_inode_cachep);
	290	}
	291
	292	module_init(vxfs_init);
	293	module_exit(vxfs_cleanup);