Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/fs/nfsctl.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 2 months ago) by niro
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File size: 2516 byte(s)
Wed Mar 4 11:03:09 2009 UTC (15 years, 2 months ago) by niro
File MIME type: text/plain
File size: 2516 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | /* |
2 | * fs/nfsctl.c |
3 | * |
4 | * This should eventually move to userland. |
5 | * |
6 | */ |
7 | #include <linux/config.h> |
8 | #include <linux/file.h> |
9 | #include <linux/fs.h> |
10 | #include <linux/sunrpc/svc.h> |
11 | #include <linux/nfsd/nfsd.h> |
12 | #include <linux/nfsd/syscall.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 | int error; |
27 | |
28 | nd.mnt = do_kern_mount("nfsd", 0, "nfsd", NULL); |
29 | |
30 | if (IS_ERR(nd.mnt)) |
31 | return (struct file *)nd.mnt; |
32 | |
33 | nd.dentry = dget(nd.mnt->mnt_root); |
34 | nd.last_type = LAST_ROOT; |
35 | nd.flags = 0; |
36 | nd.depth = 0; |
37 | |
38 | error = path_walk(name, &nd); |
39 | if (error) |
40 | return ERR_PTR(error); |
41 | |
42 | if (flags == O_RDWR) |
43 | error = may_open(&nd,MAY_READ|MAY_WRITE,FMODE_READ|FMODE_WRITE); |
44 | else |
45 | error = may_open(&nd, MAY_WRITE, FMODE_WRITE); |
46 | |
47 | if (!error) |
48 | return dentry_open(nd.dentry, nd.mnt, flags); |
49 | |
50 | path_release(&nd); |
51 | return ERR_PTR(error); |
52 | } |
53 | |
54 | static struct { |
55 | char *name; int wsize; int rsize; |
56 | } map[] = { |
57 | [NFSCTL_SVC] = { |
58 | .name = ".svc", |
59 | .wsize = sizeof(struct nfsctl_svc) |
60 | }, |
61 | [NFSCTL_ADDCLIENT] = { |
62 | .name = ".add", |
63 | .wsize = sizeof(struct nfsctl_client) |
64 | }, |
65 | [NFSCTL_DELCLIENT] = { |
66 | .name = ".del", |
67 | .wsize = sizeof(struct nfsctl_client) |
68 | }, |
69 | [NFSCTL_EXPORT] = { |
70 | .name = ".export", |
71 | .wsize = sizeof(struct nfsctl_export) |
72 | }, |
73 | [NFSCTL_UNEXPORT] = { |
74 | .name = ".unexport", |
75 | .wsize = sizeof(struct nfsctl_export) |
76 | }, |
77 | [NFSCTL_GETFD] = { |
78 | .name = ".getfd", |
79 | .wsize = sizeof(struct nfsctl_fdparm), |
80 | .rsize = NFS_FHSIZE |
81 | }, |
82 | [NFSCTL_GETFS] = { |
83 | .name = ".getfs", |
84 | .wsize = sizeof(struct nfsctl_fsparm), |
85 | .rsize = sizeof(struct knfsd_fh) |
86 | }, |
87 | }; |
88 | |
89 | long |
90 | asmlinkage sys_nfsservctl(int cmd, struct nfsctl_arg __user *arg, void __user *res) |
91 | { |
92 | struct file *file; |
93 | void __user *p = &arg->u; |
94 | int version; |
95 | int err; |
96 | |
97 | if (copy_from_user(&version, &arg->ca_version, sizeof(int))) |
98 | return -EFAULT; |
99 | |
100 | if (version != NFSCTL_VERSION) { |
101 | printk(KERN_WARNING "nfsd: incompatible version in syscall.\n"); |
102 | return -EINVAL; |
103 | } |
104 | |
105 | if (cmd < 0 || cmd >= sizeof(map)/sizeof(map[0]) || !map[cmd].name) |
106 | return -EINVAL; |
107 | |
108 | file = do_open(map[cmd].name, map[cmd].rsize ? O_RDWR : O_WRONLY); |
109 | if (IS_ERR(file)) |
110 | return PTR_ERR(file); |
111 | err = file->f_op->write(file, p, map[cmd].wsize, &file->f_pos); |
112 | if (err >= 0 && map[cmd].rsize) |
113 | err = file->f_op->read(file, res, map[cmd].rsize, &file->f_pos); |
114 | if (err >= 0) |
115 | err = 0; |
116 | fput(file); |
117 | return err; |
118 | } |