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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfsd/lockd.c | |
3 | * | |
4 | * This file contains all the stubs needed when communicating with lockd. | |
5 | * This level of indirection is necessary so we can run nfsd+lockd without | |
6 | * requiring the nfs client to be compiled in/loaded, and vice versa. | |
7 | * | |
8 | * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> | |
9 | */ | |
10 | ||
11 | #include <linux/types.h> | |
12 | #include <linux/fs.h> | |
13 | #include <linux/file.h> | |
14 | #include <linux/mount.h> | |
15 | #include <linux/sunrpc/clnt.h> | |
16 | #include <linux/sunrpc/svc.h> | |
17 | #include <linux/nfsd/nfsd.h> | |
18 | #include <linux/lockd/bind.h> | |
19 | ||
20 | #define NFSDDBG_FACILITY NFSDDBG_LOCKD | |
21 | ||
22 | /* | |
23 | * Note: we hold the dentry use count while the file is open. | |
24 | */ | |
25 | static u32 | |
26 | nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp) | |
27 | { | |
28 | u32 nfserr; | |
29 | struct svc_fh fh; | |
30 | ||
31 | /* must initialize before using! but maxsize doesn't matter */ | |
32 | fh_init(&fh,0); | |
33 | fh.fh_handle.fh_size = f->size; | |
34 | memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size); | |
35 | fh.fh_export = NULL; | |
36 | ||
37 | exp_readlock(); | |
38 | nfserr = nfsd_open(rqstp, &fh, S_IFREG, MAY_LOCK, filp); | |
39 | fh_put(&fh); | |
40 | rqstp->rq_client = NULL; | |
41 | exp_readunlock(); | |
42 | /* nlm and nfsd don't share error codes. | |
43 | * we invent: 0 = no error | |
44 | * 1 = stale file handle | |
45 | * 2 = other error | |
46 | */ | |
47 | switch (nfserr) { | |
48 | case nfs_ok: | |
49 | return 0; | |
50 | case nfserr_stale: | |
51 | return 1; | |
52 | default: | |
53 | return 2; | |
54 | } | |
55 | } | |
56 | ||
57 | static void | |
58 | nlm_fclose(struct file *filp) | |
59 | { | |
60 | fput(filp); | |
61 | } | |
62 | ||
63 | static struct nlmsvc_binding nfsd_nlm_ops = { | |
64 | .fopen = nlm_fopen, /* open file for locking */ | |
65 | .fclose = nlm_fclose, /* close file */ | |
66 | }; | |
67 | ||
68 | void | |
69 | nfsd_lockd_init(void) | |
70 | { | |
71 | dprintk("nfsd: initializing lockd\n"); | |
72 | nlmsvc_ops = &nfsd_nlm_ops; | |
73 | } | |
74 | ||
75 | void | |
76 | nfsd_lockd_shutdown(void) | |
77 | { | |
78 | nlmsvc_ops = NULL; | |
79 | } |