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3ed8491c EVH |
1 | /* |
2 | * V9FS FID Management | |
3 | * | |
46f6dac2 | 4 | * Copyright (C) 2005, 2006 by Eric Van Hensbergen <ericvh@gmail.com> |
3ed8491c EVH |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
42e8c509 EVH |
7 | * it under the terms of the GNU General Public License version 2 |
8 | * as published by the Free Software Foundation. | |
3ed8491c EVH |
9 | * |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to: | |
17 | * Free Software Foundation | |
18 | * 51 Franklin Street, Fifth Floor | |
19 | * Boston, MA 02111-1301 USA | |
20 | * | |
21 | */ | |
22 | ||
3ed8491c EVH |
23 | #include <linux/module.h> |
24 | #include <linux/errno.h> | |
25 | #include <linux/fs.h> | |
914e2637 | 26 | #include <linux/sched.h> |
3ed8491c | 27 | #include <linux/idr.h> |
da977b2c | 28 | #include <asm/semaphore.h> |
bd238fb4 LI |
29 | #include <net/9p/9p.h> |
30 | #include <net/9p/client.h> | |
3ed8491c | 31 | |
3ed8491c | 32 | #include "v9fs.h" |
3ed8491c | 33 | #include "v9fs_vfs.h" |
3ed8491c EVH |
34 | #include "fid.h" |
35 | ||
36 | /** | |
37 | * v9fs_fid_insert - add a fid to a dentry | |
38 | * @fid: fid to add | |
39 | * @dentry: dentry that it is being added to | |
40 | * | |
41 | */ | |
42 | ||
bd238fb4 | 43 | int v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid) |
3ed8491c | 44 | { |
bd238fb4 | 45 | struct v9fs_dentry *dent; |
3ed8491c | 46 | |
bd238fb4 LI |
47 | P9_DPRINTK(P9_DEBUG_VFS, "fid %d dentry %s\n", |
48 | fid->fid, dentry->d_iname); | |
3ed8491c | 49 | |
bd238fb4 LI |
50 | dent = dentry->d_fsdata; |
51 | if (!dent) { | |
52 | dent = kmalloc(sizeof(struct v9fs_dentry), GFP_KERNEL); | |
53 | if (!dent) | |
54 | return -ENOMEM; | |
3ed8491c | 55 | |
bd238fb4 LI |
56 | spin_lock_init(&dent->lock); |
57 | INIT_LIST_HEAD(&dent->fidlist); | |
58 | dentry->d_fsdata = dent; | |
3ed8491c EVH |
59 | } |
60 | ||
bd238fb4 LI |
61 | spin_lock(&dent->lock); |
62 | list_add(&fid->dlist, &dent->fidlist); | |
63 | spin_unlock(&dent->lock); | |
3ed8491c | 64 | |
bd238fb4 | 65 | return 0; |
3ed8491c EVH |
66 | } |
67 | ||
68 | /** | |
da977b2c | 69 | * v9fs_fid_lookup - return a locked fid from a dentry |
3ed8491c | 70 | * @dentry: dentry to look for fid in |
3ed8491c | 71 | * |
da977b2c EVH |
72 | * find a fid in the dentry, obtain its semaphore and return a reference to it. |
73 | * code calling lookup is responsible for releasing lock | |
46f6dac2 EVH |
74 | * |
75 | * TODO: only match fids that have the same uid as current user | |
3ed8491c EVH |
76 | * |
77 | */ | |
78 | ||
bd238fb4 | 79 | struct p9_fid *v9fs_fid_lookup(struct dentry *dentry) |
3ed8491c | 80 | { |
bd238fb4 LI |
81 | struct v9fs_dentry *dent; |
82 | struct p9_fid *fid; | |
83 | ||
84 | P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); | |
85 | dent = dentry->d_fsdata; | |
86 | if (dent) | |
87 | fid = list_entry(dent->fidlist.next, struct p9_fid, dlist); | |
88 | else | |
89 | fid = ERR_PTR(-EBADF); | |
90 | ||
91 | P9_DPRINTK(P9_DEBUG_VFS, " fid: %p\n", fid); | |
92 | return fid; | |
93 | } | |
3ed8491c | 94 | |
da977b2c | 95 | /** |
e03abc0c | 96 | * v9fs_fid_clone - lookup the fid for a dentry, clone a private copy and |
bd238fb4 | 97 | * release it |
da977b2c EVH |
98 | * @dentry: dentry to look for fid in |
99 | * | |
100 | * find a fid in the dentry and then clone to a new private fid | |
101 | * | |
102 | * TODO: only match fids that have the same uid as current user | |
103 | * | |
104 | */ | |
105 | ||
bd238fb4 | 106 | struct p9_fid *v9fs_fid_clone(struct dentry *dentry) |
da977b2c | 107 | { |
bd238fb4 | 108 | struct p9_fid *ofid, *fid; |
da977b2c | 109 | |
bd238fb4 LI |
110 | P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); |
111 | ofid = v9fs_fid_lookup(dentry); | |
112 | if (IS_ERR(ofid)) | |
113 | return ofid; | |
da977b2c | 114 | |
bd238fb4 LI |
115 | fid = p9_client_walk(ofid, 0, NULL, 1); |
116 | return fid; | |
da977b2c | 117 | } |