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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
19static inline int
20nlm_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__be32
27nlmsvc_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 = 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
58update:
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__be32
68nlmsvc_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) != NULL;
75 shpp = &share->s_next) {
76 if (share->s_host == host && nlm_cmp_owner(share, oh)) {
77 *shpp = share->s_next;
78 kfree(share);
79 return nlm_granted;
80 }
81 }
82
83 /* X/Open spec says return success even if there was no
84 * corresponding share. */
85 return nlm_granted;
86}
87
88/*
89 * Traverse all shares for a given file, and delete
90 * those owned by the given (type of) host
91 */
92void nlmsvc_traverse_shares(struct nlm_host *host, struct nlm_file *file,
93 nlm_host_match_fn_t match)
94{
95 struct nlm_share *share, **shpp;
96
97 shpp = &file->f_shares;
98 while ((share = *shpp) != NULL) {
99 if (match(share->s_host, host)) {
100 *shpp = share->s_next;
101 kfree(share);
102 continue;
103 }
104 shpp = &share->s_next;
105 }
106}
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
19static inline int
20nlm_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__be32
27nlmsvc_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 = 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
58update:
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__be32
68nlmsvc_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) != NULL;
75 shpp = &share->s_next) {
76 if (share->s_host == host && nlm_cmp_owner(share, oh)) {
77 *shpp = share->s_next;
78 kfree(share);
79 return nlm_granted;
80 }
81 }
82
83 /* X/Open spec says return success even if there was no
84 * corresponding share. */
85 return nlm_granted;
86}
87
88/*
89 * Traverse all shares for a given file, and delete
90 * those owned by the given (type of) host
91 */
92void nlmsvc_traverse_shares(struct nlm_host *host, struct nlm_file *file,
93 nlm_host_match_fn_t match)
94{
95 struct nlm_share *share, **shpp;
96
97 shpp = &file->f_shares;
98 while ((share = *shpp) != NULL) {
99 if (match(share->s_host, host)) {
100 *shpp = share->s_next;
101 kfree(share);
102 continue;
103 }
104 shpp = &share->s_next;
105 }
106}