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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/lockd/svcshare.c | |
3 | * | |
4 | * Management of DOS shares. | |
5 | * | |
6 | * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
9 | #include <linux/time.h> | |
10 | #include <linux/unistd.h> | |
11 | #include <linux/string.h> | |
12 | #include <linux/slab.h> | |
13 | ||
14 | #include <linux/sunrpc/clnt.h> | |
15 | #include <linux/sunrpc/svc.h> | |
16 | #include <linux/lockd/lockd.h> | |
17 | #include <linux/lockd/share.h> | |
18 | ||
19 | static inline int | |
20 | nlm_cmp_owner(struct nlm_share *share, struct xdr_netobj *oh) | |
21 | { | |
22 | return share->s_owner.len == oh->len | |
23 | && !memcmp(share->s_owner.data, oh->data, oh->len); | |
24 | } | |
25 | ||
26 | u32 | |
27 | nlmsvc_share_file(struct nlm_host *host, struct nlm_file *file, | |
28 | struct nlm_args *argp) | |
29 | { | |
30 | struct nlm_share *share; | |
31 | struct xdr_netobj *oh = &argp->lock.oh; | |
32 | u8 *ohdata; | |
33 | ||
34 | for (share = file->f_shares; share; share = share->s_next) { | |
35 | if (share->s_host == host && nlm_cmp_owner(share, oh)) | |
36 | goto update; | |
37 | if ((argp->fsm_access & share->s_mode) | |
38 | || (argp->fsm_mode & share->s_access )) | |
39 | return nlm_lck_denied; | |
40 | } | |
41 | ||
42 | share = (struct nlm_share *) kmalloc(sizeof(*share) + oh->len, | |
43 | GFP_KERNEL); | |
44 | if (share == NULL) | |
45 | return nlm_lck_denied_nolocks; | |
46 | ||
47 | /* Copy owner handle */ | |
48 | ohdata = (u8 *) (share + 1); | |
49 | memcpy(ohdata, oh->data, oh->len); | |
50 | ||
51 | share->s_file = file; | |
52 | share->s_host = host; | |
53 | share->s_owner.data = ohdata; | |
54 | share->s_owner.len = oh->len; | |
55 | share->s_next = file->f_shares; | |
56 | file->f_shares = share; | |
57 | ||
58 | update: | |
59 | share->s_access = argp->fsm_access; | |
60 | share->s_mode = argp->fsm_mode; | |
61 | return nlm_granted; | |
62 | } | |
63 | ||
64 | /* | |
65 | * Delete a share. | |
66 | */ | |
67 | u32 | |
68 | nlmsvc_unshare_file(struct nlm_host *host, struct nlm_file *file, | |
69 | struct nlm_args *argp) | |
70 | { | |
71 | struct nlm_share *share, **shpp; | |
72 | struct xdr_netobj *oh = &argp->lock.oh; | |
73 | ||
74 | for (shpp = &file->f_shares; (share = *shpp) != 0; shpp = &share->s_next) { | |
75 | if (share->s_host == host && nlm_cmp_owner(share, oh)) { | |
76 | *shpp = share->s_next; | |
77 | kfree(share); | |
78 | return nlm_granted; | |
79 | } | |
80 | } | |
81 | ||
82 | /* X/Open spec says return success even if there was no | |
83 | * corresponding share. */ | |
84 | return nlm_granted; | |
85 | } | |
86 | ||
87 | /* | |
88 | * Traverse all shares for a given file (and host). | |
89 | * NLM_ACT_CHECK is handled by nlmsvc_inspect_file. | |
90 | */ | |
5f12191b | 91 | void |
1da177e4 LT |
92 | nlmsvc_traverse_shares(struct nlm_host *host, struct nlm_file *file, int action) |
93 | { | |
94 | struct nlm_share *share, **shpp; | |
95 | ||
96 | shpp = &file->f_shares; | |
97 | while ((share = *shpp) != NULL) { | |
98 | if (action == NLM_ACT_MARK) | |
99 | share->s_host->h_inuse = 1; | |
100 | else if (action == NLM_ACT_UNLOCK) { | |
101 | if (host == NULL || host == share->s_host) { | |
102 | *shpp = share->s_next; | |
103 | kfree(share); | |
104 | continue; | |
105 | } | |
106 | } | |
107 | shpp = &share->s_next; | |
108 | } | |
1da177e4 | 109 | } |