tty/n_gsm: fix bug in CRC calculation for gsm1 mode
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfsctl.c
blob124e8fcb0dd6ad1fbe55c166ec30019abdd9c410
1 /*
2 * fs/nfsctl.c
4 * This should eventually move to userland.
6 */
7 #include <linux/types.h>
8 #include <linux/file.h>
9 #include <linux/fs.h>
10 #include <linux/nfsd/syscall.h>
11 #include <linux/cred.h>
12 #include <linux/sched.h>
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>
20 * open a file on nfsd fs
23 static struct file *do_open(char *name, int flags)
25 struct vfsmount *mnt;
26 struct file *file;
28 mnt = do_kern_mount("nfsd", 0, "nfsd", NULL);
29 if (IS_ERR(mnt))
30 return (struct file *)mnt;
32 file = file_open_root(mnt->mnt_root, mnt, name, flags);
34 mntput(mnt); /* drop do_kern_mount reference */
35 return file;
38 static struct {
39 char *name; int wsize; int rsize;
40 } map[] = {
41 [NFSCTL_SVC] = {
42 .name = ".svc",
43 .wsize = sizeof(struct nfsctl_svc)
45 [NFSCTL_ADDCLIENT] = {
46 .name = ".add",
47 .wsize = sizeof(struct nfsctl_client)
49 [NFSCTL_DELCLIENT] = {
50 .name = ".del",
51 .wsize = sizeof(struct nfsctl_client)
53 [NFSCTL_EXPORT] = {
54 .name = ".export",
55 .wsize = sizeof(struct nfsctl_export)
57 [NFSCTL_UNEXPORT] = {
58 .name = ".unexport",
59 .wsize = sizeof(struct nfsctl_export)
61 [NFSCTL_GETFD] = {
62 .name = ".getfd",
63 .wsize = sizeof(struct nfsctl_fdparm),
64 .rsize = NFS_FHSIZE
66 [NFSCTL_GETFS] = {
67 .name = ".getfs",
68 .wsize = sizeof(struct nfsctl_fsparm),
69 .rsize = sizeof(struct knfsd_fh)
73 SYSCALL_DEFINE3(nfsservctl, int, cmd, struct nfsctl_arg __user *, arg,
74 void __user *, res)
76 struct file *file;
77 void __user *p = &arg->u;
78 int version;
79 int err;
81 if (copy_from_user(&version, &arg->ca_version, sizeof(int)))
82 return -EFAULT;
84 if (version != NFSCTL_VERSION)
85 return -EINVAL;
87 if (cmd < 0 || cmd >= ARRAY_SIZE(map) || !map[cmd].name)
88 return -EINVAL;
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;