e8c96f8c29
Use ARRAY_SIZE macro instead of sizeof(x)/sizeof(x[0]) and remove a duplicate of ARRAY_SIZE. Some trailing whitespaces are also deleted. Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch> Cc: David Howells <dhowells@redhat.com> Cc: Dave Kleikamp <shaggy@austin.ibm.com> Acked-by: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: Neil Brown <neilb@cse.unsw.edu.au> Cc: Chris Mason <mason@suse.com> Cc: Jeff Mahoney <jeffm@suse.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Nathan Scott <nathans@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
117 lines
2.4 KiB
C
117 lines
2.4 KiB
C
/*
|
|
* fs/nfsctl.c
|
|
*
|
|
* This should eventually move to userland.
|
|
*
|
|
*/
|
|
#include <linux/config.h>
|
|
#include <linux/types.h>
|
|
#include <linux/file.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/sunrpc/svc.h>
|
|
#include <linux/nfsd/nfsd.h>
|
|
#include <linux/nfsd/syscall.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 nameidata nd;
|
|
int error;
|
|
|
|
nd.mnt = do_kern_mount("nfsd", 0, "nfsd", NULL);
|
|
|
|
if (IS_ERR(nd.mnt))
|
|
return (struct file *)nd.mnt;
|
|
|
|
nd.dentry = dget(nd.mnt->mnt_root);
|
|
nd.last_type = LAST_ROOT;
|
|
nd.flags = 0;
|
|
nd.depth = 0;
|
|
|
|
error = path_walk(name, &nd);
|
|
if (error)
|
|
return ERR_PTR(error);
|
|
|
|
if (flags == O_RDWR)
|
|
error = may_open(&nd,MAY_READ|MAY_WRITE,FMODE_READ|FMODE_WRITE);
|
|
else
|
|
error = may_open(&nd, MAY_WRITE, FMODE_WRITE);
|
|
|
|
if (!error)
|
|
return dentry_open(nd.dentry, nd.mnt, flags);
|
|
|
|
path_release(&nd);
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
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)
|
|
},
|
|
};
|
|
|
|
long
|
|
asmlinkage sys_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;
|
|
}
|