1 /* 2 * V9FS definitions. 3 * 4 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> 5 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 6 * 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. 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 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, 54 }; 55 56 /** 57 * struct v9fs_session_info - per-instance session information 58 * @flags: session options of type &p9_session_flags 59 * @nodev: set to 1 to disable device mapping 60 * @debug: debug level 61 * @afid: authentication handle 62 * @cache: cache mode of type &p9_cache_modes 63 * @options: copy of options string given by user 64 * @uname: string user name to mount hierarchy as 65 * @aname: mount specifier for remote hierarchy 66 * @maxdata: maximum data to be sent/recvd per protocol message 67 * @dfltuid: default numeric userid to mount hierarchy as 68 * @dfltgid: default numeric groupid to mount hierarchy as 69 * @uid: if %V9FS_ACCESS_SINGLE, the numeric uid which mounted the hierarchy 70 * @clnt: reference to 9P network client instantiated for this session 71 * @debugfs_dir: reference to debugfs_dir which can be used for add'l debug 72 * 73 * This structure holds state for each session instance established during 74 * a sys_mount() . 75 * 76 * Bugs: there seems to be a lot of state which could be condensed and/or 77 * removed. 78 */ 79 80 struct v9fs_session_info { 81 /* options */ 82 unsigned char flags; 83 unsigned char nodev; 84 unsigned short debug; 85 unsigned int afid; 86 unsigned int cache; 87 88 char *options; /* copy of mount options */ 89 char *uname; /* user name to mount as */ 90 char *aname; /* name of remote hierarchy being mounted */ 91 unsigned int maxdata; /* max data for client interface */ 92 unsigned int dfltuid; /* default uid/muid for legacy support */ 93 unsigned int dfltgid; /* default gid for legacy support */ 94 u32 uid; /* if ACCESS_SINGLE, the uid that has access */ 95 struct p9_client *clnt; /* 9p client */ 96 struct dentry *debugfs_dir; 97 }; 98 99 extern struct dentry *v9fs_debugfs_root; 100 101 struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *, 102 char *); 103 void v9fs_session_close(struct v9fs_session_info *v9ses); 104 void v9fs_session_cancel(struct v9fs_session_info *v9ses); 105 106 #define V9FS_MAGIC 0x01021997 107 108 /* other default globals */ 109 #define V9FS_PORT 564 110 #define V9FS_DEFUSER "nobody" 111 #define V9FS_DEFANAME "" 112 #define V9FS_DEFUID (-2) 113 #define V9FS_DEFGID (-2) 114 115 static inline struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode) 116 { 117 return (inode->i_sb->s_fs_info); 118 } 119 120 static inline int v9fs_extended(struct v9fs_session_info *v9ses) 121 { 122 return v9ses->flags & V9FS_EXTENDED; 123 } 124