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1 | /* |
2 | * fs/nfsctl.c |
3 | * |
4 | * This should eventually move to userland. |
5 | * |
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> |
18 | |
19 | /* |
20 | * open a file on nfsd fs |
21 | */ |
22 | |
23 | static struct file *do_open(char *name, int flags) |
24 | { |
25 | struct nameidata nd; |
26 | struct vfsmount *mnt; |
27 | int error; |
28 | |
29 | mnt = do_kern_mount("nfsd", 0, "nfsd", NULL); |
30 | if (IS_ERR(mnt)) |
31 | return (struct file *)mnt; |
32 | |
33 | error = vfs_path_lookup(mnt->mnt_root, mnt, name, 0, &nd); |
34 | mntput(mnt); /* drop do_kern_mount reference */ |
35 | if (error) |
36 | return ERR_PTR(error); |
37 | |
38 | if (flags == O_RDWR) |
39 | error = may_open(&nd.path, MAY_READ|MAY_WRITE, flags); |
40 | else |
41 | error = may_open(&nd.path, MAY_WRITE, flags); |
42 | |
43 | if (!error) |
44 | return dentry_open(nd.path.dentry, nd.path.mnt, flags, |
45 | current_cred()); |
46 | |
47 | path_put(&nd.path); |
48 | return ERR_PTR(error); |
49 | } |
50 | |
51 | static struct { |
52 | char *name; int wsize; int rsize; |
53 | } map[] = { |
54 | [NFSCTL_SVC] = { |
55 | .name = ".svc", |
56 | .wsize = sizeof(struct nfsctl_svc) |
57 | }, |
58 | [NFSCTL_ADDCLIENT] = { |
59 | .name = ".add", |
60 | .wsize = sizeof(struct nfsctl_client) |
61 | }, |
62 | [NFSCTL_DELCLIENT] = { |
63 | .name = ".del", |
64 | .wsize = sizeof(struct nfsctl_client) |
65 | }, |
66 | [NFSCTL_EXPORT] = { |
67 | .name = ".export", |
68 | .wsize = sizeof(struct nfsctl_export) |
69 | }, |
70 | [NFSCTL_UNEXPORT] = { |
71 | .name = ".unexport", |
72 | .wsize = sizeof(struct nfsctl_export) |
73 | }, |
74 | [NFSCTL_GETFD] = { |
75 | .name = ".getfd", |
76 | .wsize = sizeof(struct nfsctl_fdparm), |
77 | .rsize = NFS_FHSIZE |
78 | }, |
79 | [NFSCTL_GETFS] = { |
80 | .name = ".getfs", |
81 | .wsize = sizeof(struct nfsctl_fsparm), |
82 | .rsize = sizeof(struct knfsd_fh) |
83 | }, |
84 | }; |
85 | |
86 | SYSCALL_DEFINE3(nfsservctl, int, cmd, struct nfsctl_arg __user *, arg, |
87 | void __user *, res) |
88 | { |
89 | struct file *file; |
90 | void __user *p = &arg->u; |
91 | int version; |
92 | int err; |
93 | |
94 | if (copy_from_user(&version, &arg->ca_version, sizeof(int))) |
95 | return -EFAULT; |
96 | |
97 | if (version != NFSCTL_VERSION) |
98 | return -EINVAL; |
99 | |
100 | if (cmd < 0 || cmd >= ARRAY_SIZE(map) || !map[cmd].name) |
101 | return -EINVAL; |
102 | |
103 | file = do_open(map[cmd].name, map[cmd].rsize ? O_RDWR : O_WRONLY); |
104 | if (IS_ERR(file)) |
105 | return PTR_ERR(file); |
106 | err = file->f_op->write(file, p, map[cmd].wsize, &file->f_pos); |
107 | if (err >= 0 && map[cmd].rsize) |
108 | err = file->f_op->read(file, res, map[cmd].rsize, &file->f_pos); |
109 | if (err >= 0) |
110 | err = 0; |
111 | fput(file); |
112 | return err; |
113 | } |
114 |
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