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9e82cf6a EVH |
1 | /* |
2 | * V9FS definitions. | |
3 | * | |
8a0dc95f | 4 | * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> |
9e82cf6a EVH |
5 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
42e8c509 EVH |
8 | * it under the terms of the GNU General Public License version 2 |
9 | * as published by the Free Software Foundation. | |
9e82cf6a EVH |
10 | * |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to: | |
18 | * Free Software Foundation | |
19 | * 51 Franklin Street, Fifth Floor | |
20 | * Boston, MA 02111-1301 USA | |
21 | * | |
22 | */ | |
23 | ||
ee443996 EVH |
24 | /** |
25 | * enum p9_session_flags - option flags for each 9P session | |
26 | * @V9FS_EXTENDED: whether or not to use 9P2000.u extensions | |
27 | * @V9FS_ACCESS_SINGLE: only the mounting user can access the hierarchy | |
28 | * @V9FS_ACCESS_USER: a new attach will be issued for every user (default) | |
29 | * @V9FS_ACCESS_ANY: use a single attach for all users | |
30 | * @V9FS_ACCESS_MASK: bit mask of different ACCESS options | |
31 | * | |
32 | * Session flags reflect options selected by users at mount time | |
33 | */ | |
34 | enum p9_session_flags { | |
35 | V9FS_EXTENDED = 0x01, | |
36 | V9FS_ACCESS_SINGLE = 0x02, | |
37 | V9FS_ACCESS_USER = 0x04, | |
38 | V9FS_ACCESS_ANY = 0x06, | |
39 | V9FS_ACCESS_MASK = 0x06, | |
40 | }; | |
41 | ||
42 | /* possible values of ->cache */ | |
43 | /** | |
44 | * enum p9_cache_modes - user specified cache preferences | |
45 | * @CACHE_NONE: do not cache data, dentries, or directory contents (default) | |
46 | * @CACHE_LOOSE: cache data, dentries, and directory contents w/no consistency | |
47 | * | |
48 | * eventually support loose, tight, time, session, default always none | |
49 | */ | |
50 | ||
51 | enum p9_cache_modes { | |
52 | CACHE_NONE, | |
53 | CACHE_LOOSE, | |
60e78d2c | 54 | CACHE_FSCACHE, |
ee443996 EVH |
55 | }; |
56 | ||
57 | /** | |
58 | * struct v9fs_session_info - per-instance session information | |
59 | * @flags: session options of type &p9_session_flags | |
60 | * @nodev: set to 1 to disable device mapping | |
61 | * @debug: debug level | |
62 | * @afid: authentication handle | |
63 | * @cache: cache mode of type &p9_cache_modes | |
60e78d2c AK |
64 | * @cachetag: the tag of the cache associated with this session |
65 | * @fscache: session cookie associated with FS-Cache | |
ee443996 EVH |
66 | * @options: copy of options string given by user |
67 | * @uname: string user name to mount hierarchy as | |
68 | * @aname: mount specifier for remote hierarchy | |
69 | * @maxdata: maximum data to be sent/recvd per protocol message | |
70 | * @dfltuid: default numeric userid to mount hierarchy as | |
71 | * @dfltgid: default numeric groupid to mount hierarchy as | |
72 | * @uid: if %V9FS_ACCESS_SINGLE, the numeric uid which mounted the hierarchy | |
73 | * @clnt: reference to 9P network client instantiated for this session | |
60e78d2c | 74 | * @slist: reference to list of registered 9p sessions |
ee443996 EVH |
75 | * |
76 | * This structure holds state for each session instance established during | |
77 | * a sys_mount() . | |
78 | * | |
79 | * Bugs: there seems to be a lot of state which could be condensed and/or | |
80 | * removed. | |
81 | */ | |
9e82cf6a EVH |
82 | |
83 | struct v9fs_session_info { | |
84 | /* options */ | |
ee443996 EVH |
85 | unsigned char flags; |
86 | unsigned char nodev; | |
87 | unsigned short debug; | |
88 | unsigned int afid; | |
89 | unsigned int cache; | |
60e78d2c AK |
90 | #ifdef CONFIG_9P_FSCACHE |
91 | char *cachetag; | |
92 | struct fscache_cookie *fscache; | |
93 | #endif | |
9e82cf6a | 94 | |
ba17674f LI |
95 | char *uname; /* user name to mount as */ |
96 | char *aname; /* name of remote hierarchy being mounted */ | |
8a0dc95f | 97 | unsigned int maxdata; /* max data for client interface */ |
bd32b82d LI |
98 | unsigned int dfltuid; /* default uid/muid for legacy support */ |
99 | unsigned int dfltgid; /* default gid for legacy support */ | |
ba17674f | 100 | u32 uid; /* if ACCESS_SINGLE, the uid that has access */ |
bd238fb4 | 101 | struct p9_client *clnt; /* 9p client */ |
60e78d2c | 102 | struct list_head slist; /* list of sessions registered with v9fs */ |
9e82cf6a EVH |
103 | }; |
104 | ||
bd238fb4 LI |
105 | struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *, |
106 | char *); | |
9e82cf6a | 107 | void v9fs_session_close(struct v9fs_session_info *v9ses); |
322b329a | 108 | void v9fs_session_cancel(struct v9fs_session_info *v9ses); |
9e82cf6a EVH |
109 | |
110 | #define V9FS_MAGIC 0x01021997 | |
111 | ||
112 | /* other default globals */ | |
bd32b82d | 113 | #define V9FS_PORT 564 |
9e82cf6a EVH |
114 | #define V9FS_DEFUSER "nobody" |
115 | #define V9FS_DEFANAME "" | |
bd32b82d LI |
116 | #define V9FS_DEFUID (-2) |
117 | #define V9FS_DEFGID (-2) | |
9e82cf6a | 118 | |
bd238fb4 LI |
119 | static inline struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode) |
120 | { | |
121 | return (inode->i_sb->s_fs_info); | |
122 | } | |
2405669b LI |
123 | |
124 | static inline int v9fs_extended(struct v9fs_session_info *v9ses) | |
125 | { | |
126 | return v9ses->flags & V9FS_EXTENDED; | |
127 | } |