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Source at commit be977234bfb4a6dca8a39e7c52165e4cd536ad71 created 12 years 9 months ago. By Lars-Peter Clausen, jz4740: Fix compile error | |
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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 vfsmount *mnt; |
26 | struct file *file; |
27 | |
28 | mnt = do_kern_mount("nfsd", 0, "nfsd", NULL); |
29 | if (IS_ERR(mnt)) |
30 | return (struct file *)mnt; |
31 | |
32 | file = file_open_root(mnt->mnt_root, mnt, name, flags); |
33 | |
34 | mntput(mnt); /* drop do_kern_mount reference */ |
35 | return file; |
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 | |
73 | SYSCALL_DEFINE3(nfsservctl, int, cmd, struct nfsctl_arg __user *, arg, |
74 | void __user *, res) |
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 | |
84 | if (version != NFSCTL_VERSION) |
85 | return -EINVAL; |
86 | |
87 | if (cmd < 0 || cmd >= ARRAY_SIZE(map) || !map[cmd].name) |
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 | } |
101 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9