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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 | */ | |
0ed07ddb | 23 | #include <linux/backing-dev.h> |
9e82cf6a | 24 | |
ee443996 EVH |
25 | /** |
26 | * enum p9_session_flags - option flags for each 9P session | |
dd6102fb | 27 | * @V9FS_PROTO_2000U: whether or not to use 9P2000.u extensions |
45bc21ed | 28 | * @V9FS_PROTO_2000L: whether or not to use 9P2000.l extensions |
ee443996 EVH |
29 | * @V9FS_ACCESS_SINGLE: only the mounting user can access the hierarchy |
30 | * @V9FS_ACCESS_USER: a new attach will be issued for every user (default) | |
31 | * @V9FS_ACCESS_ANY: use a single attach for all users | |
32 | * @V9FS_ACCESS_MASK: bit mask of different ACCESS options | |
33 | * | |
34 | * Session flags reflect options selected by users at mount time | |
35 | */ | |
76381a42 AK |
36 | #define V9FS_ACCESS_ANY (V9FS_ACCESS_SINGLE | \ |
37 | V9FS_ACCESS_USER | \ | |
38 | V9FS_ACCESS_CLIENT) | |
39 | #define V9FS_ACCESS_MASK V9FS_ACCESS_ANY | |
40 | ||
ee443996 | 41 | enum p9_session_flags { |
dd6102fb | 42 | V9FS_PROTO_2000U = 0x01, |
45bc21ed | 43 | V9FS_PROTO_2000L = 0x02, |
dd6102fb SK |
44 | V9FS_ACCESS_SINGLE = 0x04, |
45 | V9FS_ACCESS_USER = 0x08, | |
76381a42 | 46 | V9FS_ACCESS_CLIENT = 0x10 |
ee443996 EVH |
47 | }; |
48 | ||
49 | /* possible values of ->cache */ | |
50 | /** | |
51 | * enum p9_cache_modes - user specified cache preferences | |
52 | * @CACHE_NONE: do not cache data, dentries, or directory contents (default) | |
53 | * @CACHE_LOOSE: cache data, dentries, and directory contents w/no consistency | |
54 | * | |
55 | * eventually support loose, tight, time, session, default always none | |
56 | */ | |
57 | ||
58 | enum p9_cache_modes { | |
59 | CACHE_NONE, | |
60 | CACHE_LOOSE, | |
60e78d2c | 61 | CACHE_FSCACHE, |
ee443996 EVH |
62 | }; |
63 | ||
64 | /** | |
65 | * struct v9fs_session_info - per-instance session information | |
66 | * @flags: session options of type &p9_session_flags | |
67 | * @nodev: set to 1 to disable device mapping | |
68 | * @debug: debug level | |
69 | * @afid: authentication handle | |
70 | * @cache: cache mode of type &p9_cache_modes | |
60e78d2c AK |
71 | * @cachetag: the tag of the cache associated with this session |
72 | * @fscache: session cookie associated with FS-Cache | |
ee443996 EVH |
73 | * @options: copy of options string given by user |
74 | * @uname: string user name to mount hierarchy as | |
75 | * @aname: mount specifier for remote hierarchy | |
76 | * @maxdata: maximum data to be sent/recvd per protocol message | |
77 | * @dfltuid: default numeric userid to mount hierarchy as | |
78 | * @dfltgid: default numeric groupid to mount hierarchy as | |
79 | * @uid: if %V9FS_ACCESS_SINGLE, the numeric uid which mounted the hierarchy | |
80 | * @clnt: reference to 9P network client instantiated for this session | |
60e78d2c | 81 | * @slist: reference to list of registered 9p sessions |
ee443996 EVH |
82 | * |
83 | * This structure holds state for each session instance established during | |
84 | * a sys_mount() . | |
85 | * | |
86 | * Bugs: there seems to be a lot of state which could be condensed and/or | |
87 | * removed. | |
88 | */ | |
9e82cf6a EVH |
89 | |
90 | struct v9fs_session_info { | |
91 | /* options */ | |
ee443996 EVH |
92 | unsigned char flags; |
93 | unsigned char nodev; | |
94 | unsigned short debug; | |
95 | unsigned int afid; | |
96 | unsigned int cache; | |
60e78d2c AK |
97 | #ifdef CONFIG_9P_FSCACHE |
98 | char *cachetag; | |
99 | struct fscache_cookie *fscache; | |
100 | #endif | |
9e82cf6a | 101 | |
ba17674f LI |
102 | char *uname; /* user name to mount as */ |
103 | char *aname; /* name of remote hierarchy being mounted */ | |
8a0dc95f | 104 | unsigned int maxdata; /* max data for client interface */ |
bd32b82d LI |
105 | unsigned int dfltuid; /* default uid/muid for legacy support */ |
106 | unsigned int dfltgid; /* default gid for legacy support */ | |
ba17674f | 107 | u32 uid; /* if ACCESS_SINGLE, the uid that has access */ |
bd238fb4 | 108 | struct p9_client *clnt; /* 9p client */ |
60e78d2c | 109 | struct list_head slist; /* list of sessions registered with v9fs */ |
0ed07ddb | 110 | struct backing_dev_info bdi; |
a534c8d1 | 111 | struct rw_semaphore rename_sem; |
9e82cf6a EVH |
112 | }; |
113 | ||
bd238fb4 LI |
114 | struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *, |
115 | char *); | |
9e82cf6a | 116 | void v9fs_session_close(struct v9fs_session_info *v9ses); |
322b329a | 117 | void v9fs_session_cancel(struct v9fs_session_info *v9ses); |
6d96d3ab | 118 | void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses); |
9e82cf6a | 119 | |
9e82cf6a | 120 | /* other default globals */ |
bd32b82d | 121 | #define V9FS_PORT 564 |
9e82cf6a EVH |
122 | #define V9FS_DEFUSER "nobody" |
123 | #define V9FS_DEFANAME "" | |
bd32b82d LI |
124 | #define V9FS_DEFUID (-2) |
125 | #define V9FS_DEFGID (-2) | |
9e82cf6a | 126 | |
bd238fb4 LI |
127 | static inline struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode) |
128 | { | |
129 | return (inode->i_sb->s_fs_info); | |
130 | } | |
2405669b | 131 | |
dd6102fb | 132 | static inline int v9fs_proto_dotu(struct v9fs_session_info *v9ses) |
2405669b | 133 | { |
dd6102fb SK |
134 | return v9ses->flags & V9FS_PROTO_2000U; |
135 | } | |
136 | ||
137 | static inline int v9fs_proto_dotl(struct v9fs_session_info *v9ses) | |
138 | { | |
45bc21ed | 139 | return v9ses->flags & V9FS_PROTO_2000L; |
2405669b | 140 | } |