4 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
5 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2
9 * as published by the Free Software Foundation.
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.
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
23 #include <linux/backing-dev.h>
26 * enum p9_session_flags - option flags for each 9P session
27 * @V9FS_PROTO_2000U: whether or not to use 9P2000.u extensions
28 * @V9FS_PROTO_2000L: whether or not to use 9P2000.l extensions
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
34 * Session flags reflect options selected by users at mount time
36 enum p9_session_flags
{
37 V9FS_PROTO_2000U
= 0x01,
38 V9FS_PROTO_2000L
= 0x02,
39 V9FS_ACCESS_SINGLE
= 0x04,
40 V9FS_ACCESS_USER
= 0x08,
41 V9FS_ACCESS_ANY
= 0x0C,
42 V9FS_ACCESS_MASK
= 0x0C,
45 /* possible values of ->cache */
47 * enum p9_cache_modes - user specified cache preferences
48 * @CACHE_NONE: do not cache data, dentries, or directory contents (default)
49 * @CACHE_LOOSE: cache data, dentries, and directory contents w/no consistency
51 * eventually support loose, tight, time, session, default always none
61 * struct v9fs_session_info - per-instance session information
62 * @flags: session options of type &p9_session_flags
63 * @nodev: set to 1 to disable device mapping
65 * @afid: authentication handle
66 * @cache: cache mode of type &p9_cache_modes
67 * @cachetag: the tag of the cache associated with this session
68 * @fscache: session cookie associated with FS-Cache
69 * @options: copy of options string given by user
70 * @uname: string user name to mount hierarchy as
71 * @aname: mount specifier for remote hierarchy
72 * @maxdata: maximum data to be sent/recvd per protocol message
73 * @dfltuid: default numeric userid to mount hierarchy as
74 * @dfltgid: default numeric groupid to mount hierarchy as
75 * @uid: if %V9FS_ACCESS_SINGLE, the numeric uid which mounted the hierarchy
76 * @clnt: reference to 9P network client instantiated for this session
77 * @slist: reference to list of registered 9p sessions
79 * This structure holds state for each session instance established during
82 * Bugs: there seems to be a lot of state which could be condensed and/or
86 struct v9fs_session_info
{
93 #ifdef CONFIG_9P_FSCACHE
95 struct fscache_cookie
*fscache
;
98 char *uname
; /* user name to mount as */
99 char *aname
; /* name of remote hierarchy being mounted */
100 unsigned int maxdata
; /* max data for client interface */
101 unsigned int dfltuid
; /* default uid/muid for legacy support */
102 unsigned int dfltgid
; /* default gid for legacy support */
103 u32 uid
; /* if ACCESS_SINGLE, the uid that has access */
104 struct p9_client
*clnt
; /* 9p client */
105 struct list_head slist
; /* list of sessions registered with v9fs */
106 struct backing_dev_info bdi
;
109 struct p9_fid
*v9fs_session_init(struct v9fs_session_info
*, const char *,
111 void v9fs_session_close(struct v9fs_session_info
*v9ses
);
112 void v9fs_session_cancel(struct v9fs_session_info
*v9ses
);
113 void v9fs_session_begin_cancel(struct v9fs_session_info
*v9ses
);
115 #define V9FS_MAGIC 0x01021997
117 /* other default globals */
118 #define V9FS_PORT 564
119 #define V9FS_DEFUSER "nobody"
120 #define V9FS_DEFANAME ""
121 #define V9FS_DEFUID (-2)
122 #define V9FS_DEFGID (-2)
124 static inline struct v9fs_session_info
*v9fs_inode2v9ses(struct inode
*inode
)
126 return (inode
->i_sb
->s_fs_info
);
129 static inline int v9fs_proto_dotu(struct v9fs_session_info
*v9ses
)
131 return v9ses
->flags
& V9FS_PROTO_2000U
;
134 static inline int v9fs_proto_dotl(struct v9fs_session_info
*v9ses
)
136 return v9ses
->flags
& V9FS_PROTO_2000L
;
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