19e82cf6aSEric Van Hensbergen /* 29e82cf6aSEric Van Hensbergen * V9FS definitions. 39e82cf6aSEric Van Hensbergen * 48a0dc95fSEric Van Hensbergen * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> 59e82cf6aSEric Van Hensbergen * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 69e82cf6aSEric Van Hensbergen * 79e82cf6aSEric Van Hensbergen * This program is free software; you can redistribute it and/or modify 842e8c509SEric Van Hensbergen * it under the terms of the GNU General Public License version 2 942e8c509SEric Van Hensbergen * as published by the Free Software Foundation. 109e82cf6aSEric Van Hensbergen * 119e82cf6aSEric Van Hensbergen * This program is distributed in the hope that it will be useful, 129e82cf6aSEric Van Hensbergen * but WITHOUT ANY WARRANTY; without even the implied warranty of 139e82cf6aSEric Van Hensbergen * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 149e82cf6aSEric Van Hensbergen * GNU General Public License for more details. 159e82cf6aSEric Van Hensbergen * 169e82cf6aSEric Van Hensbergen * You should have received a copy of the GNU General Public License 179e82cf6aSEric Van Hensbergen * along with this program; if not, write to: 189e82cf6aSEric Van Hensbergen * Free Software Foundation 199e82cf6aSEric Van Hensbergen * 51 Franklin Street, Fifth Floor 209e82cf6aSEric Van Hensbergen * Boston, MA 02111-1301 USA 219e82cf6aSEric Van Hensbergen * 229e82cf6aSEric Van Hensbergen */ 230ed07ddbSJens Axboe #include <linux/backing-dev.h> 249e82cf6aSEric Van Hensbergen 25ee443996SEric Van Hensbergen /** 26ee443996SEric Van Hensbergen * enum p9_session_flags - option flags for each 9P session 27dd6102fbSSripathi Kodi * @V9FS_PROTO_2000U: whether or not to use 9P2000.u extensions 2845bc21edSSripathi Kodi * @V9FS_PROTO_2000L: whether or not to use 9P2000.l extensions 29ee443996SEric Van Hensbergen * @V9FS_ACCESS_SINGLE: only the mounting user can access the hierarchy 30ee443996SEric Van Hensbergen * @V9FS_ACCESS_USER: a new attach will be issued for every user (default) 31ee443996SEric Van Hensbergen * @V9FS_ACCESS_ANY: use a single attach for all users 32ee443996SEric Van Hensbergen * @V9FS_ACCESS_MASK: bit mask of different ACCESS options 339e82cf6aSEric Van Hensbergen * 34ee443996SEric Van Hensbergen * Session flags reflect options selected by users at mount time 35ee443996SEric Van Hensbergen */ 3676381a42SAneesh Kumar K.V #define V9FS_ACCESS_ANY (V9FS_ACCESS_SINGLE | \ 3776381a42SAneesh Kumar K.V V9FS_ACCESS_USER | \ 3876381a42SAneesh Kumar K.V V9FS_ACCESS_CLIENT) 3976381a42SAneesh Kumar K.V #define V9FS_ACCESS_MASK V9FS_ACCESS_ANY 4076381a42SAneesh Kumar K.V 41ee443996SEric Van Hensbergen enum p9_session_flags { 42dd6102fbSSripathi Kodi V9FS_PROTO_2000U = 0x01, 4345bc21edSSripathi Kodi V9FS_PROTO_2000L = 0x02, 44dd6102fbSSripathi Kodi V9FS_ACCESS_SINGLE = 0x04, 45dd6102fbSSripathi Kodi V9FS_ACCESS_USER = 0x08, 4676381a42SAneesh Kumar K.V V9FS_ACCESS_CLIENT = 0x10 47ee443996SEric Van Hensbergen }; 48ee443996SEric Van Hensbergen 49ee443996SEric Van Hensbergen /* possible values of ->cache */ 50ee443996SEric Van Hensbergen /** 51ee443996SEric Van Hensbergen * enum p9_cache_modes - user specified cache preferences 52ee443996SEric Van Hensbergen * @CACHE_NONE: do not cache data, dentries, or directory contents (default) 53ee443996SEric Van Hensbergen * @CACHE_LOOSE: cache data, dentries, and directory contents w/no consistency 54ee443996SEric Van Hensbergen * 55ee443996SEric Van Hensbergen * eventually support loose, tight, time, session, default always none 56ee443996SEric Van Hensbergen */ 57ee443996SEric Van Hensbergen 58ee443996SEric Van Hensbergen enum p9_cache_modes { 59ee443996SEric Van Hensbergen CACHE_NONE, 60ee443996SEric Van Hensbergen CACHE_LOOSE, 6160e78d2cSAbhishek Kulkarni CACHE_FSCACHE, 62ee443996SEric Van Hensbergen }; 63ee443996SEric Van Hensbergen 64ee443996SEric Van Hensbergen /** 65ee443996SEric Van Hensbergen * struct v9fs_session_info - per-instance session information 66ee443996SEric Van Hensbergen * @flags: session options of type &p9_session_flags 67ee443996SEric Van Hensbergen * @nodev: set to 1 to disable device mapping 68ee443996SEric Van Hensbergen * @debug: debug level 69ee443996SEric Van Hensbergen * @afid: authentication handle 70ee443996SEric Van Hensbergen * @cache: cache mode of type &p9_cache_modes 7160e78d2cSAbhishek Kulkarni * @cachetag: the tag of the cache associated with this session 7260e78d2cSAbhishek Kulkarni * @fscache: session cookie associated with FS-Cache 73ee443996SEric Van Hensbergen * @options: copy of options string given by user 74ee443996SEric Van Hensbergen * @uname: string user name to mount hierarchy as 75ee443996SEric Van Hensbergen * @aname: mount specifier for remote hierarchy 76ee443996SEric Van Hensbergen * @maxdata: maximum data to be sent/recvd per protocol message 77ee443996SEric Van Hensbergen * @dfltuid: default numeric userid to mount hierarchy as 78ee443996SEric Van Hensbergen * @dfltgid: default numeric groupid to mount hierarchy as 79ee443996SEric Van Hensbergen * @uid: if %V9FS_ACCESS_SINGLE, the numeric uid which mounted the hierarchy 80ee443996SEric Van Hensbergen * @clnt: reference to 9P network client instantiated for this session 8160e78d2cSAbhishek Kulkarni * @slist: reference to list of registered 9p sessions 82ee443996SEric Van Hensbergen * 83ee443996SEric Van Hensbergen * This structure holds state for each session instance established during 84ee443996SEric Van Hensbergen * a sys_mount() . 85ee443996SEric Van Hensbergen * 86ee443996SEric Van Hensbergen * Bugs: there seems to be a lot of state which could be condensed and/or 87ee443996SEric Van Hensbergen * removed. 889e82cf6aSEric Van Hensbergen */ 899e82cf6aSEric Van Hensbergen 909e82cf6aSEric Van Hensbergen struct v9fs_session_info { 919e82cf6aSEric Van Hensbergen /* options */ 92ee443996SEric Van Hensbergen unsigned char flags; 93ee443996SEric Van Hensbergen unsigned char nodev; 94ee443996SEric Van Hensbergen unsigned short debug; 95ee443996SEric Van Hensbergen unsigned int afid; 96ee443996SEric Van Hensbergen unsigned int cache; 9760e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 9860e78d2cSAbhishek Kulkarni char *cachetag; 9960e78d2cSAbhishek Kulkarni struct fscache_cookie *fscache; 10060e78d2cSAbhishek Kulkarni #endif 1019e82cf6aSEric Van Hensbergen 102ba17674fSLatchesar Ionkov char *uname; /* user name to mount as */ 103ba17674fSLatchesar Ionkov char *aname; /* name of remote hierarchy being mounted */ 1048a0dc95fSEric Van Hensbergen unsigned int maxdata; /* max data for client interface */ 105bd32b82dSLatchesar Ionkov unsigned int dfltuid; /* default uid/muid for legacy support */ 106bd32b82dSLatchesar Ionkov unsigned int dfltgid; /* default gid for legacy support */ 107ba17674fSLatchesar Ionkov u32 uid; /* if ACCESS_SINGLE, the uid that has access */ 108bd238fb4SLatchesar Ionkov struct p9_client *clnt; /* 9p client */ 10960e78d2cSAbhishek Kulkarni struct list_head slist; /* list of sessions registered with v9fs */ 1100ed07ddbSJens Axboe struct backing_dev_info bdi; 111a534c8d1SAneesh Kumar K.V struct rw_semaphore rename_sem; 1129e82cf6aSEric Van Hensbergen }; 1139e82cf6aSEric Van Hensbergen 114bd238fb4SLatchesar Ionkov struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *, 115bd238fb4SLatchesar Ionkov char *); 11653c06f4eSAneesh Kumar K.V extern void v9fs_session_close(struct v9fs_session_info *v9ses); 11753c06f4eSAneesh Kumar K.V extern void v9fs_session_cancel(struct v9fs_session_info *v9ses); 11853c06f4eSAneesh Kumar K.V extern void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses); 11953c06f4eSAneesh Kumar K.V extern struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 12053c06f4eSAneesh Kumar K.V struct nameidata *nameidata); 12153c06f4eSAneesh Kumar K.V extern int v9fs_vfs_unlink(struct inode *i, struct dentry *d); 12253c06f4eSAneesh Kumar K.V extern int v9fs_vfs_rmdir(struct inode *i, struct dentry *d); 12353c06f4eSAneesh Kumar K.V extern int v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 12453c06f4eSAneesh Kumar K.V struct inode *new_dir, struct dentry *new_dentry); 12553c06f4eSAneesh Kumar K.V extern void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, 12653c06f4eSAneesh Kumar K.V void *p); 12753c06f4eSAneesh Kumar K.V extern struct inode *v9fs_inode(struct v9fs_session_info *v9ses, 12853c06f4eSAneesh Kumar K.V struct p9_fid *fid, 12953c06f4eSAneesh Kumar K.V struct super_block *sb); 13053c06f4eSAneesh Kumar K.V 13153c06f4eSAneesh Kumar K.V extern const struct inode_operations v9fs_dir_inode_operations_dotl; 13253c06f4eSAneesh Kumar K.V extern const struct inode_operations v9fs_file_inode_operations_dotl; 13353c06f4eSAneesh Kumar K.V extern const struct inode_operations v9fs_symlink_inode_operations_dotl; 13453c06f4eSAneesh Kumar K.V extern struct inode *v9fs_inode_dotl(struct v9fs_session_info *v9ses, 13553c06f4eSAneesh Kumar K.V struct p9_fid *fid, 13653c06f4eSAneesh Kumar K.V struct super_block *sb); 1379e82cf6aSEric Van Hensbergen 1389e82cf6aSEric Van Hensbergen /* other default globals */ 1399e82cf6aSEric Van Hensbergen #define V9FS_PORT 564 1409e82cf6aSEric Van Hensbergen #define V9FS_DEFUSER "nobody" 1419e82cf6aSEric Van Hensbergen #define V9FS_DEFANAME "" 142bd32b82dSLatchesar Ionkov #define V9FS_DEFUID (-2) 143bd32b82dSLatchesar Ionkov #define V9FS_DEFGID (-2) 1449e82cf6aSEric Van Hensbergen 145bd238fb4SLatchesar Ionkov static inline struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode) 146bd238fb4SLatchesar Ionkov { 147bd238fb4SLatchesar Ionkov return (inode->i_sb->s_fs_info); 148bd238fb4SLatchesar Ionkov } 1492405669bSLatchesar Ionkov 150dd6102fbSSripathi Kodi static inline int v9fs_proto_dotu(struct v9fs_session_info *v9ses) 1512405669bSLatchesar Ionkov { 152dd6102fbSSripathi Kodi return v9ses->flags & V9FS_PROTO_2000U; 153dd6102fbSSripathi Kodi } 154dd6102fbSSripathi Kodi 155dd6102fbSSripathi Kodi static inline int v9fs_proto_dotl(struct v9fs_session_info *v9ses) 156dd6102fbSSripathi Kodi { 15745bc21edSSripathi Kodi return v9ses->flags & V9FS_PROTO_2000L; 1582405669bSLatchesar Ionkov } 15953c06f4eSAneesh Kumar K.V 16053c06f4eSAneesh Kumar K.V /** 16153c06f4eSAneesh Kumar K.V * v9fs_inode_from_fid - Helper routine to populate an inode by 16253c06f4eSAneesh Kumar K.V * issuing a attribute request 16353c06f4eSAneesh Kumar K.V * @v9ses: session information 16453c06f4eSAneesh Kumar K.V * @fid: fid to issue attribute request for 16553c06f4eSAneesh Kumar K.V * @sb: superblock on which to create inode 16653c06f4eSAneesh Kumar K.V * 16753c06f4eSAneesh Kumar K.V */ 16853c06f4eSAneesh Kumar K.V static inline struct inode * 16953c06f4eSAneesh Kumar K.V v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 17053c06f4eSAneesh Kumar K.V struct super_block *sb) 17153c06f4eSAneesh Kumar K.V { 17253c06f4eSAneesh Kumar K.V if (v9fs_proto_dotl(v9ses)) 17353c06f4eSAneesh Kumar K.V return v9fs_inode_dotl(v9ses, fid, sb); 17453c06f4eSAneesh Kumar K.V else 17553c06f4eSAneesh Kumar K.V return v9fs_inode(v9ses, fid, sb); 17653c06f4eSAneesh Kumar K.V } 177