Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/lockd/svcshare.c | |
4 | * | |
5 | * Management of DOS shares. | |
6 | * | |
7 | * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de> | |
8 | */ | |
9 | ||
10 | #include <linux/time.h> | |
11 | #include <linux/unistd.h> | |
12 | #include <linux/string.h> | |
13 | #include <linux/slab.h> | |
14 | ||
15 | #include <linux/sunrpc/clnt.h> | |
16 | #include <linux/sunrpc/svc.h> | |
17 | #include <linux/lockd/lockd.h> | |
18 | #include <linux/lockd/share.h> | |
19 | ||
20 | static inline int | |
21 | nlm_cmp_owner(struct nlm_share *share, struct xdr_netobj *oh) | |
22 | { | |
23 | return share->s_owner.len == oh->len | |
24 | && !memcmp(share->s_owner.data, oh->data, oh->len); | |
25 | } | |
26 | ||
52921e02 | 27 | __be32 |
1da177e4 LT |
28 | nlmsvc_share_file(struct nlm_host *host, struct nlm_file *file, |
29 | struct nlm_args *argp) | |
30 | { | |
31 | struct nlm_share *share; | |
32 | struct xdr_netobj *oh = &argp->lock.oh; | |
33 | u8 *ohdata; | |
34 | ||
35 | for (share = file->f_shares; share; share = share->s_next) { | |
36 | if (share->s_host == host && nlm_cmp_owner(share, oh)) | |
37 | goto update; | |
38 | if ((argp->fsm_access & share->s_mode) | |
39 | || (argp->fsm_mode & share->s_access )) | |
40 | return nlm_lck_denied; | |
41 | } | |
42 | ||
5cbded58 | 43 | share = kmalloc(sizeof(*share) + oh->len, |
1da177e4 LT |
44 | GFP_KERNEL); |
45 | if (share == NULL) | |
46 | return nlm_lck_denied_nolocks; | |
47 | ||
48 | /* Copy owner handle */ | |
49 | ohdata = (u8 *) (share + 1); | |
50 | memcpy(ohdata, oh->data, oh->len); | |
51 | ||
52 | share->s_file = file; | |
53 | share->s_host = host; | |
54 | share->s_owner.data = ohdata; | |
55 | share->s_owner.len = oh->len; | |
56 | share->s_next = file->f_shares; | |
57 | file->f_shares = share; | |
58 | ||
59 | update: | |
60 | share->s_access = argp->fsm_access; | |
61 | share->s_mode = argp->fsm_mode; | |
62 | return nlm_granted; | |
63 | } | |
64 | ||
65 | /* | |
66 | * Delete a share. | |
67 | */ | |
52921e02 | 68 | __be32 |
1da177e4 LT |
69 | nlmsvc_unshare_file(struct nlm_host *host, struct nlm_file *file, |
70 | struct nlm_args *argp) | |
71 | { | |
72 | struct nlm_share *share, **shpp; | |
73 | struct xdr_netobj *oh = &argp->lock.oh; | |
74 | ||
93245d11 HH |
75 | for (shpp = &file->f_shares; (share = *shpp) != NULL; |
76 | shpp = &share->s_next) { | |
1da177e4 LT |
77 | if (share->s_host == host && nlm_cmp_owner(share, oh)) { |
78 | *shpp = share->s_next; | |
79 | kfree(share); | |
80 | return nlm_granted; | |
81 | } | |
82 | } | |
83 | ||
84 | /* X/Open spec says return success even if there was no | |
85 | * corresponding share. */ | |
86 | return nlm_granted; | |
87 | } | |
88 | ||
89 | /* | |
f2af793d OK |
90 | * Traverse all shares for a given file, and delete |
91 | * those owned by the given (type of) host | |
1da177e4 | 92 | */ |
f2af793d OK |
93 | void nlmsvc_traverse_shares(struct nlm_host *host, struct nlm_file *file, |
94 | nlm_host_match_fn_t match) | |
1da177e4 LT |
95 | { |
96 | struct nlm_share *share, **shpp; | |
97 | ||
98 | shpp = &file->f_shares; | |
99 | while ((share = *shpp) != NULL) { | |
f2af793d OK |
100 | if (match(share->s_host, host)) { |
101 | *shpp = share->s_next; | |
102 | kfree(share); | |
103 | continue; | |
1da177e4 LT |
104 | } |
105 | shpp = &share->s_next; | |
106 | } | |
1da177e4 | 107 | } |