Commit | Line | Data |
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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 EVH |
27 | #include <linux/idr.h> |
28 | ||
29 | #include "debug.h" | |
30 | #include "v9fs.h" | |
31 | #include "9p.h" | |
32 | #include "v9fs_vfs.h" | |
3ed8491c EVH |
33 | #include "fid.h" |
34 | ||
35 | /** | |
36 | * v9fs_fid_insert - add a fid to a dentry | |
37 | * @fid: fid to add | |
38 | * @dentry: dentry that it is being added to | |
39 | * | |
40 | */ | |
41 | ||
6a3124a3 | 42 | int v9fs_fid_insert(struct v9fs_fid *fid, struct dentry *dentry) |
3ed8491c EVH |
43 | { |
44 | struct list_head *fid_list = (struct list_head *)dentry->d_fsdata; | |
45 | dprintk(DEBUG_9P, "fid %d (%p) dentry %s (%p)\n", fid->fid, fid, | |
46 | dentry->d_iname, dentry); | |
47 | if (dentry->d_fsdata == NULL) { | |
48 | dentry->d_fsdata = | |
49 | kmalloc(sizeof(struct list_head), GFP_KERNEL); | |
50 | if (dentry->d_fsdata == NULL) { | |
51 | dprintk(DEBUG_ERROR, "Out of memory\n"); | |
52 | return -ENOMEM; | |
53 | } | |
54 | fid_list = (struct list_head *)dentry->d_fsdata; | |
55 | INIT_LIST_HEAD(fid_list); /* Initialize list head */ | |
56 | } | |
57 | ||
58 | fid->uid = current->uid; | |
3ed8491c EVH |
59 | list_add(&fid->list, fid_list); |
60 | return 0; | |
61 | } | |
62 | ||
63 | /** | |
64 | * v9fs_fid_create - allocate a FID structure | |
65 | * @dentry - dentry to link newly created fid to | |
66 | * | |
67 | */ | |
68 | ||
6a3124a3 | 69 | struct v9fs_fid *v9fs_fid_create(struct v9fs_session_info *v9ses, int fid) |
3ed8491c EVH |
70 | { |
71 | struct v9fs_fid *new; | |
72 | ||
6a3124a3 | 73 | dprintk(DEBUG_9P, "fid create fid %d\n", fid); |
3ed8491c EVH |
74 | new = kmalloc(sizeof(struct v9fs_fid), GFP_KERNEL); |
75 | if (new == NULL) { | |
76 | dprintk(DEBUG_ERROR, "Out of Memory\n"); | |
77 | return ERR_PTR(-ENOMEM); | |
78 | } | |
79 | ||
0b8dd177 LI |
80 | new->fid = fid; |
81 | new->v9ses = v9ses; | |
3ed8491c | 82 | new->fidopen = 0; |
3ed8491c EVH |
83 | new->fidclunked = 0; |
84 | new->iounit = 0; | |
0b8dd177 LI |
85 | new->rdir_pos = 0; |
86 | new->rdir_fcall = NULL; | |
6a3124a3 | 87 | INIT_LIST_HEAD(&new->list); |
3ed8491c | 88 | |
46f6dac2 | 89 | return new; |
3ed8491c EVH |
90 | } |
91 | ||
92 | /** | |
93 | * v9fs_fid_destroy - deallocate a FID structure | |
94 | * @fid: fid to destroy | |
95 | * | |
96 | */ | |
97 | ||
98 | void v9fs_fid_destroy(struct v9fs_fid *fid) | |
99 | { | |
100 | list_del(&fid->list); | |
101 | kfree(fid); | |
102 | } | |
103 | ||
104 | /** | |
105 | * v9fs_fid_lookup - retrieve the right fid from a particular dentry | |
106 | * @dentry: dentry to look for fid in | |
107 | * @type: intent of lookup (operation or traversal) | |
108 | * | |
46f6dac2 EVH |
109 | * find a fid in the dentry |
110 | * | |
111 | * TODO: only match fids that have the same uid as current user | |
3ed8491c EVH |
112 | * |
113 | */ | |
114 | ||
0b8dd177 | 115 | struct v9fs_fid *v9fs_fid_lookup(struct dentry *dentry) |
3ed8491c EVH |
116 | { |
117 | struct list_head *fid_list = (struct list_head *)dentry->d_fsdata; | |
3ed8491c | 118 | struct v9fs_fid *return_fid = NULL; |
3ed8491c | 119 | |
0b8dd177 | 120 | dprintk(DEBUG_9P, " dentry: %s (%p)\n", dentry->d_iname, dentry); |
3ed8491c | 121 | |
6a3124a3 LI |
122 | if (fid_list) |
123 | return_fid = list_entry(fid_list->next, struct v9fs_fid, list); | |
3ed8491c EVH |
124 | |
125 | if (!return_fid) { | |
46f6dac2 | 126 | dprintk(DEBUG_ERROR, "Couldn't find a fid in dentry\n"); |
0b8dd177 | 127 | } |
3ed8491c | 128 | |
0b8dd177 LI |
129 | return return_fid; |
130 | } |