[deliverable/linux.git] / fs / nfsctl.c

/*
 *	fs/nfsctl.c
 *
 *	This should eventually move to userland.
 *
 */
#include <linux/types.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/nfsd/syscall.h>
#include <linux/cred.h>
#include <linux/sched.h>
#include <linux/linkage.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/syscalls.h>
#include <asm/uaccess.h>

/*
 * open a file on nfsd fs
 */

static struct file *do_open(char *name, int flags)
{
	struct vfsmount *mnt;
	struct file *file;

	mnt = do_kern_mount("nfsd", 0, "nfsd", NULL);
	if (IS_ERR(mnt))
		return (struct file *)mnt;

	file = file_open_root(mnt->mnt_root, mnt, name, flags);

	mntput(mnt);	/* drop do_kern_mount reference */
	return file;
}

static struct {
	char *name; int wsize; int rsize;
} map[] = {
	[NFSCTL_SVC] = {
		.name	= ".svc",
		.wsize	= sizeof(struct nfsctl_svc)
	},
	[NFSCTL_ADDCLIENT] = {
		.name	= ".add",
		.wsize	= sizeof(struct nfsctl_client)
	},
	[NFSCTL_DELCLIENT] = {
		.name	= ".del",
		.wsize	= sizeof(struct nfsctl_client)
	},
	[NFSCTL_EXPORT] = {
		.name	= ".export",
		.wsize	= sizeof(struct nfsctl_export)
	},
	[NFSCTL_UNEXPORT] = {
		.name	= ".unexport",
		.wsize	= sizeof(struct nfsctl_export)
	},
	[NFSCTL_GETFD] = {
		.name	= ".getfd",
		.wsize	= sizeof(struct nfsctl_fdparm),
		.rsize	= NFS_FHSIZE
	},
	[NFSCTL_GETFS] = {
		.name	= ".getfs",
		.wsize	= sizeof(struct nfsctl_fsparm),
		.rsize	= sizeof(struct knfsd_fh)
	},
};

SYSCALL_DEFINE3(nfsservctl, int, cmd, struct nfsctl_arg __user *, arg,
		void __user *, res)
{
	struct file *file;
	void __user *p = &arg->u;
	int version;
	int err;

	if (copy_from_user(&version, &arg->ca_version, sizeof(int)))
		return -EFAULT;

	if (version != NFSCTL_VERSION)
		return -EINVAL;

	if (cmd < 0 || cmd >= ARRAY_SIZE(map) || !map[cmd].name)
		return -EINVAL;

	file = do_open(map[cmd].name, map[cmd].rsize ? O_RDWR : O_WRONLY);	
	if (IS_ERR(file))
		return PTR_ERR(file);
	err = file->f_op->write(file, p, map[cmd].wsize, &file->f_pos);
	if (err >= 0 && map[cmd].rsize)
		err = file->f_op->read(file, res, map[cmd].rsize, &file->f_pos);
	if (err >= 0)
		err = 0;
	fput(file);
	return err;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* fs/nfsctl.c
	3	*
	4	* This should eventually move to userland.
	5	*
	6	*/
715b49ef	7	#include <linux/types.h>
1da177e4 LT	8	#include <linux/file.h>
1da177e4 LT	9	#include <linux/fs.h>
1da177e4	10	#include <linux/nfsd/syscall.h>
9789cfe2 RD	11	#include <linux/cred.h>
9789cfe2 RD	12	#include <linux/sched.h>
1da177e4 LT	13	#include <linux/linkage.h>
	14	#include <linux/namei.h>
	15	#include <linux/mount.h>
	16	#include <linux/syscalls.h>
	17	#include <asm/uaccess.h>
	18
	19	/*
	20	* open a file on nfsd fs
	21	*/
	22
	23	static struct file do_open(char name, int flags)
	24	{
16b6287a	25	struct vfsmount *mnt;
73d049a4	26	struct file *file;
1da177e4	27
16b6287a JJS	28	mnt = do_kern_mount("nfsd", 0, "nfsd", NULL);
	29	if (IS_ERR(mnt))
	30	return (struct file *)mnt;
1da177e4	31
73d049a4	32	file = file_open_root(mnt->mnt_root, mnt, name, flags);
1da177e4	33
73d049a4 AV	34	mntput(mnt); /* drop do_kern_mount reference */
73d049a4 AV	35	return file;
1da177e4 LT	36	}
	37
	38	static struct {
	39	char *name; int wsize; int rsize;
	40	} map[] = {
	41	[NFSCTL_SVC] = {
	42	.name = ".svc",
	43	.wsize = sizeof(struct nfsctl_svc)
	44	},
	45	[NFSCTL_ADDCLIENT] = {
	46	.name = ".add",
	47	.wsize = sizeof(struct nfsctl_client)
	48	},
	49	[NFSCTL_DELCLIENT] = {
	50	.name = ".del",
	51	.wsize = sizeof(struct nfsctl_client)
	52	},
	53	[NFSCTL_EXPORT] = {
	54	.name = ".export",
	55	.wsize = sizeof(struct nfsctl_export)
	56	},
	57	[NFSCTL_UNEXPORT] = {
	58	.name = ".unexport",
	59	.wsize = sizeof(struct nfsctl_export)
	60	},
	61	[NFSCTL_GETFD] = {
	62	.name = ".getfd",
	63	.wsize = sizeof(struct nfsctl_fdparm),
	64	.rsize = NFS_FHSIZE
	65	},
	66	[NFSCTL_GETFS] = {
	67	.name = ".getfs",
	68	.wsize = sizeof(struct nfsctl_fsparm),
	69	.rsize = sizeof(struct knfsd_fh)
	70	},
	71	};
	72
1e7bfb21 HC	73	SYSCALL_DEFINE3(nfsservctl, int, cmd, struct nfsctl_arg __user *, arg,
1e7bfb21 HC	74	void __user *, res)
1da177e4 LT	75	{
	76	struct file *file;
	77	void __user *p = &arg->u;
	78	int version;
	79	int err;
	80
	81	if (copy_from_user(&version, &arg->ca_version, sizeof(int)))
	82	return -EFAULT;
	83
85c6932e	84	if (version != NFSCTL_VERSION)
1da177e4	85	return -EINVAL;
1da177e4	86
e8c96f8c	87	if (cmd < 0 \|\| cmd >= ARRAY_SIZE(map) \|\| !map[cmd].name)
1da177e4 LT	88	return -EINVAL;
	89
	90	file = do_open(map[cmd].name, map[cmd].rsize ? O_RDWR : O_WRONLY);
	91	if (IS_ERR(file))
	92	return PTR_ERR(file);
	93	err = file->f_op->write(file, p, map[cmd].wsize, &file->f_pos);
	94	if (err >= 0 && map[cmd].rsize)
	95	err = file->f_op->read(file, res, map[cmd].rsize, &file->f_pos);
	96	if (err >= 0)
	97	err = 0;
	98	fput(file);
	99	return err;
	100	}