mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-11-20 00:26:39 +08:00
1d957f9bf8
* Add path_put() functions for releasing a reference to the dentry and vfsmount of a struct path in the right order * Switch from path_release(nd) to path_put(&nd->path) * Rename dput_path() to path_put_conditional() [akpm@linux-foundation.org: fix cifs] Signed-off-by: Jan Blunck <jblunck@suse.de> Signed-off-by: Andreas Gruenbacher <agruen@suse.de> Acked-by: Christoph Hellwig <hch@lst.de> Cc: <linux-fsdevel@vger.kernel.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Steven French <sfrench@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
113 lines
2.4 KiB
C
113 lines
2.4 KiB
C
/*
|
|
* fs/nfsctl.c
|
|
*
|
|
* This should eventually move to userland.
|
|
*
|
|
*/
|
|
#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;
|
|
struct vfsmount *mnt;
|
|
int error;
|
|
|
|
mnt = do_kern_mount("nfsd", 0, "nfsd", NULL);
|
|
if (IS_ERR(mnt))
|
|
return (struct file *)mnt;
|
|
|
|
error = vfs_path_lookup(mnt->mnt_root, mnt, name, 0, &nd);
|
|
mntput(mnt); /* drop do_kern_mount reference */
|
|
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.path.dentry, nd.path.mnt, flags);
|
|
|
|
path_put(&nd.path);
|
|
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;
|
|
}
|