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> |
9 | #include <linux/fs.h> | |
1da177e4 | 10 | #include <linux/nfsd/syscall.h> |
9789cfe2 RD |
11 | #include <linux/cred.h> |
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 */ |
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, |
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 | } |