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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [lockd/] [svcshare.c] - Blame information for rev 1765

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/*
 * linux/fs/lockd/svcshare.c
 *
 * Management of DOS shares.
 *
 * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de>
 */
 
#include <linux/sched.h>
#include <linux/unistd.h>
#include <linux/string.h>
#include <linux/slab.h>
 
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svc.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/share.h>
 
static inline int
nlm_cmp_owner(struct nlm_share *share, struct xdr_netobj *oh)
{
        return share->s_owner.len == oh->len
            && !memcmp(share->s_owner.data, oh->data, oh->len);
}
 
u32
nlmsvc_share_file(struct nlm_host *host, struct nlm_file *file,
                        struct nlm_args *argp)
{
        struct nlm_share        *share;
        struct xdr_netobj       *oh = &argp->lock.oh;
        u8                      *ohdata;
 
        for (share = file->f_shares; share; share = share->s_next) {
                if (share->s_host == host && nlm_cmp_owner(share, oh))
                        goto update;
                if ((argp->fsm_access & share->s_mode)
                 || (argp->fsm_mode   & share->s_access ))
                        return nlm_lck_denied;
        }
 
        share = (struct nlm_share *) kmalloc(sizeof(*share) + oh->len,
                                                GFP_KERNEL);
        if (share == NULL)
                return nlm_lck_denied_nolocks;
 
        /* Copy owner handle */
        ohdata = (u8 *) (share + 1);
        memcpy(ohdata, oh->data, oh->len);
 
        share->s_file       = file;
        share->s_host       = host;
        share->s_owner.data = ohdata;
        share->s_owner.len  = oh->len;
        share->s_next       = file->f_shares;
        file->f_shares      = share;
 
update:
        share->s_access = argp->fsm_access;
        share->s_mode   = argp->fsm_mode;
        return nlm_granted;
}
 
/*
 * Delete a share.
 */
u32
nlmsvc_unshare_file(struct nlm_host *host, struct nlm_file *file,
                        struct nlm_args *argp)
{
        struct nlm_share        *share, **shpp;
        struct xdr_netobj       *oh = &argp->lock.oh;
 
        for (shpp = &file->f_shares; (share = *shpp); shpp = &share->s_next) {
                if (share->s_host == host && nlm_cmp_owner(share, oh)) {
                        *shpp = share->s_next;
                        kfree(share);
                        return nlm_granted;
                }
        }
 
        /* X/Open spec says return success even if there was no
         * corresponding share. */
        return nlm_granted;
}
 
/*
 * Traverse all shares for a given file (and host).
 * NLM_ACT_CHECK is handled by nlmsvc_inspect_file.
 */
int
nlmsvc_traverse_shares(struct nlm_host *host, struct nlm_file *file, int action)
{
        struct nlm_share        *share, **shpp;
 
        shpp = &file->f_shares;
        while ((share = *shpp) !=  NULL) {
                if (action == NLM_ACT_MARK)
                        share->s_host->h_inuse = 1;
                else if (action == NLM_ACT_UNLOCK) {
                        if (host == NULL || host == share->s_host) {
                                *shpp = share->s_next;
                                kfree(share);
                                continue;
                        }
                }
                shpp = &share->s_next;
        }
 
        return 0;
}

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
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/sched.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); 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			`*/`
91			`int`
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			`}`
109
110			`return 0;`
111			`}`

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [lockd/] [svcshare.c] - Blame information for rev 1765