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 */ 23e0459f57SAneesh Kumar K.V #ifndef FS_9P_V9FS_H 24e0459f57SAneesh Kumar K.V #define FS_9P_V9FS_H 25e0459f57SAneesh Kumar K.V 260ed07ddbSJens Axboe #include <linux/backing-dev.h> 279e82cf6aSEric Van Hensbergen 28ee443996SEric Van Hensbergen /** 29ee443996SEric Van Hensbergen * enum p9_session_flags - option flags for each 9P session 30dd6102fbSSripathi Kodi * @V9FS_PROTO_2000U: whether or not to use 9P2000.u extensions 3145bc21edSSripathi Kodi * @V9FS_PROTO_2000L: whether or not to use 9P2000.l extensions 32ee443996SEric Van Hensbergen * @V9FS_ACCESS_SINGLE: only the mounting user can access the hierarchy 33ee443996SEric Van Hensbergen * @V9FS_ACCESS_USER: a new attach will be issued for every user (default) 34e782ef71SVenkateswararao Jujjuri (JV) * @V9FS_ACCESS_CLIENT: Just like user, but access check is performed on client. 35ee443996SEric Van Hensbergen * @V9FS_ACCESS_ANY: use a single attach for all users 36ee443996SEric Van Hensbergen * @V9FS_ACCESS_MASK: bit mask of different ACCESS options 37e782ef71SVenkateswararao Jujjuri (JV) * @V9FS_POSIX_ACL: POSIX ACLs are enforced 389e82cf6aSEric Van Hensbergen * 39ee443996SEric Van Hensbergen * Session flags reflect options selected by users at mount time 40ee443996SEric Van Hensbergen */ 4176381a42SAneesh Kumar K.V #define V9FS_ACCESS_ANY (V9FS_ACCESS_SINGLE | \ 4276381a42SAneesh Kumar K.V V9FS_ACCESS_USER | \ 4376381a42SAneesh Kumar K.V V9FS_ACCESS_CLIENT) 4476381a42SAneesh Kumar K.V #define V9FS_ACCESS_MASK V9FS_ACCESS_ANY 45e782ef71SVenkateswararao Jujjuri (JV) #define V9FS_ACL_MASK V9FS_POSIX_ACL 4676381a42SAneesh Kumar K.V 47ee443996SEric Van Hensbergen enum p9_session_flags { 48dd6102fbSSripathi Kodi V9FS_PROTO_2000U = 0x01, 4945bc21edSSripathi Kodi V9FS_PROTO_2000L = 0x02, 50dd6102fbSSripathi Kodi V9FS_ACCESS_SINGLE = 0x04, 51dd6102fbSSripathi Kodi V9FS_ACCESS_USER = 0x08, 52e782ef71SVenkateswararao Jujjuri (JV) V9FS_ACCESS_CLIENT = 0x10, 53e782ef71SVenkateswararao Jujjuri (JV) V9FS_POSIX_ACL = 0x20 54ee443996SEric Van Hensbergen }; 55ee443996SEric Van Hensbergen 56ee443996SEric Van Hensbergen /* possible values of ->cache */ 57ee443996SEric Van Hensbergen /** 58ee443996SEric Van Hensbergen * enum p9_cache_modes - user specified cache preferences 59ee443996SEric Van Hensbergen * @CACHE_NONE: do not cache data, dentries, or directory contents (default) 60ee443996SEric Van Hensbergen * @CACHE_LOOSE: cache data, dentries, and directory contents w/no consistency 61ee443996SEric Van Hensbergen * 62ee443996SEric Van Hensbergen * eventually support loose, tight, time, session, default always none 63ee443996SEric Van Hensbergen */ 64ee443996SEric Van Hensbergen 65ee443996SEric Van Hensbergen enum p9_cache_modes { 66ee443996SEric Van Hensbergen CACHE_NONE, 67ee443996SEric Van Hensbergen CACHE_LOOSE, 6860e78d2cSAbhishek Kulkarni CACHE_FSCACHE, 69ee443996SEric Van Hensbergen }; 70ee443996SEric Van Hensbergen 71ee443996SEric Van Hensbergen /** 72ee443996SEric Van Hensbergen * struct v9fs_session_info - per-instance session information 73ee443996SEric Van Hensbergen * @flags: session options of type &p9_session_flags 74ee443996SEric Van Hensbergen * @nodev: set to 1 to disable device mapping 75ee443996SEric Van Hensbergen * @debug: debug level 76ee443996SEric Van Hensbergen * @afid: authentication handle 77ee443996SEric Van Hensbergen * @cache: cache mode of type &p9_cache_modes 7860e78d2cSAbhishek Kulkarni * @cachetag: the tag of the cache associated with this session 7960e78d2cSAbhishek Kulkarni * @fscache: session cookie associated with FS-Cache 80ee443996SEric Van Hensbergen * @options: copy of options string given by user 81ee443996SEric Van Hensbergen * @uname: string user name to mount hierarchy as 82ee443996SEric Van Hensbergen * @aname: mount specifier for remote hierarchy 83ee443996SEric Van Hensbergen * @maxdata: maximum data to be sent/recvd per protocol message 84ee443996SEric Van Hensbergen * @dfltuid: default numeric userid to mount hierarchy as 85ee443996SEric Van Hensbergen * @dfltgid: default numeric groupid to mount hierarchy as 86ee443996SEric Van Hensbergen * @uid: if %V9FS_ACCESS_SINGLE, the numeric uid which mounted the hierarchy 87ee443996SEric Van Hensbergen * @clnt: reference to 9P network client instantiated for this session 8860e78d2cSAbhishek Kulkarni * @slist: reference to list of registered 9p sessions 89ee443996SEric Van Hensbergen * 90ee443996SEric Van Hensbergen * This structure holds state for each session instance established during 91ee443996SEric Van Hensbergen * a sys_mount() . 92ee443996SEric Van Hensbergen * 93ee443996SEric Van Hensbergen * Bugs: there seems to be a lot of state which could be condensed and/or 94ee443996SEric Van Hensbergen * removed. 959e82cf6aSEric Van Hensbergen */ 969e82cf6aSEric Van Hensbergen 979e82cf6aSEric Van Hensbergen struct v9fs_session_info { 989e82cf6aSEric Van Hensbergen /* options */ 99ee443996SEric Van Hensbergen unsigned char flags; 100ee443996SEric Van Hensbergen unsigned char nodev; 101ee443996SEric Van Hensbergen unsigned short debug; 102ee443996SEric Van Hensbergen unsigned int afid; 103ee443996SEric Van Hensbergen unsigned int cache; 10460e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 10560e78d2cSAbhishek Kulkarni char *cachetag; 10660e78d2cSAbhishek Kulkarni struct fscache_cookie *fscache; 10760e78d2cSAbhishek Kulkarni #endif 1089e82cf6aSEric Van Hensbergen 109ba17674fSLatchesar Ionkov char *uname; /* user name to mount as */ 110ba17674fSLatchesar Ionkov char *aname; /* name of remote hierarchy being mounted */ 1118a0dc95fSEric Van Hensbergen unsigned int maxdata; /* max data for client interface */ 112bd32b82dSLatchesar Ionkov unsigned int dfltuid; /* default uid/muid for legacy support */ 113bd32b82dSLatchesar Ionkov unsigned int dfltgid; /* default gid for legacy support */ 114ba17674fSLatchesar Ionkov u32 uid; /* if ACCESS_SINGLE, the uid that has access */ 115bd238fb4SLatchesar Ionkov struct p9_client *clnt; /* 9p client */ 11660e78d2cSAbhishek Kulkarni struct list_head slist; /* list of sessions registered with v9fs */ 1170ed07ddbSJens Axboe struct backing_dev_info bdi; 118a534c8d1SAneesh Kumar K.V struct rw_semaphore rename_sem; 1199e82cf6aSEric Van Hensbergen }; 1209e82cf6aSEric Van Hensbergen 121b3cbea03SAneesh Kumar K.V /* cache_validity flags */ 122b3cbea03SAneesh Kumar K.V #define V9FS_INO_INVALID_ATTR 0x01 123b3cbea03SAneesh Kumar K.V 124a78ce05dSAneesh Kumar K.V struct v9fs_inode { 125a78ce05dSAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 126a78ce05dSAneesh Kumar K.V spinlock_t fscache_lock; 127a78ce05dSAneesh Kumar K.V struct fscache_cookie *fscache; 128a78ce05dSAneesh Kumar K.V #endif 129fd2421f5SAneesh Kumar K.V struct p9_qid qid; 130b3cbea03SAneesh Kumar K.V unsigned int cache_validity; 1316b39f6d2SAneesh Kumar K.V struct p9_fid *writeback_fid; 1325a7e0a8cSAneesh Kumar K.V struct mutex v_mutex; 133a78ce05dSAneesh Kumar K.V struct inode vfs_inode; 134a78ce05dSAneesh Kumar K.V }; 135a78ce05dSAneesh Kumar K.V 136a78ce05dSAneesh Kumar K.V static inline struct v9fs_inode *V9FS_I(const struct inode *inode) 137a78ce05dSAneesh Kumar K.V { 138a78ce05dSAneesh Kumar K.V return container_of(inode, struct v9fs_inode, vfs_inode); 139a78ce05dSAneesh Kumar K.V } 140a78ce05dSAneesh Kumar K.V 141bd238fb4SLatchesar Ionkov struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *, 142bd238fb4SLatchesar Ionkov char *); 14353c06f4eSAneesh Kumar K.V extern void v9fs_session_close(struct v9fs_session_info *v9ses); 14453c06f4eSAneesh Kumar K.V extern void v9fs_session_cancel(struct v9fs_session_info *v9ses); 14553c06f4eSAneesh Kumar K.V extern void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses); 14653c06f4eSAneesh Kumar K.V extern struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 14700cd8dd3SAl Viro unsigned int flags); 14853c06f4eSAneesh Kumar K.V extern int v9fs_vfs_unlink(struct inode *i, struct dentry *d); 14953c06f4eSAneesh Kumar K.V extern int v9fs_vfs_rmdir(struct inode *i, struct dentry *d); 15053c06f4eSAneesh Kumar K.V extern int v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 15153c06f4eSAneesh Kumar K.V struct inode *new_dir, struct dentry *new_dentry); 15253c06f4eSAneesh Kumar K.V extern void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, 15353c06f4eSAneesh Kumar K.V void *p); 154a78ce05dSAneesh Kumar K.V extern struct inode *v9fs_inode_from_fid(struct v9fs_session_info *v9ses, 15553c06f4eSAneesh Kumar K.V struct p9_fid *fid, 156ed80fcfaSAneesh Kumar K.V struct super_block *sb, int new); 15753c06f4eSAneesh Kumar K.V extern const struct inode_operations v9fs_dir_inode_operations_dotl; 15853c06f4eSAneesh Kumar K.V extern const struct inode_operations v9fs_file_inode_operations_dotl; 15953c06f4eSAneesh Kumar K.V extern const struct inode_operations v9fs_symlink_inode_operations_dotl; 160a78ce05dSAneesh Kumar K.V extern struct inode *v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, 16153c06f4eSAneesh Kumar K.V struct p9_fid *fid, 162ed80fcfaSAneesh Kumar K.V struct super_block *sb, int new); 1639e82cf6aSEric Van Hensbergen 1649e82cf6aSEric Van Hensbergen /* other default globals */ 1659e82cf6aSEric Van Hensbergen #define V9FS_PORT 564 1669e82cf6aSEric Van Hensbergen #define V9FS_DEFUSER "nobody" 1679e82cf6aSEric Van Hensbergen #define V9FS_DEFANAME "" 168bd32b82dSLatchesar Ionkov #define V9FS_DEFUID (-2) 169bd32b82dSLatchesar Ionkov #define V9FS_DEFGID (-2) 1709e82cf6aSEric Van Hensbergen 171bd238fb4SLatchesar Ionkov static inline struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode) 172bd238fb4SLatchesar Ionkov { 173bd238fb4SLatchesar Ionkov return (inode->i_sb->s_fs_info); 174bd238fb4SLatchesar Ionkov } 1752405669bSLatchesar Ionkov 17642869c8aSAneesh Kumar K.V static inline struct v9fs_session_info *v9fs_dentry2v9ses(struct dentry *dentry) 17742869c8aSAneesh Kumar K.V { 17842869c8aSAneesh Kumar K.V return dentry->d_sb->s_fs_info; 17942869c8aSAneesh Kumar K.V } 18042869c8aSAneesh Kumar K.V 181dd6102fbSSripathi Kodi static inline int v9fs_proto_dotu(struct v9fs_session_info *v9ses) 1822405669bSLatchesar Ionkov { 183dd6102fbSSripathi Kodi return v9ses->flags & V9FS_PROTO_2000U; 184dd6102fbSSripathi Kodi } 185dd6102fbSSripathi Kodi 186dd6102fbSSripathi Kodi static inline int v9fs_proto_dotl(struct v9fs_session_info *v9ses) 187dd6102fbSSripathi Kodi { 18845bc21edSSripathi Kodi return v9ses->flags & V9FS_PROTO_2000L; 1892405669bSLatchesar Ionkov } 19053c06f4eSAneesh Kumar K.V 19153c06f4eSAneesh Kumar K.V /** 192a78ce05dSAneesh Kumar K.V * v9fs_get_inode_from_fid - Helper routine to populate an inode by 19353c06f4eSAneesh Kumar K.V * issuing a attribute request 19453c06f4eSAneesh Kumar K.V * @v9ses: session information 19553c06f4eSAneesh Kumar K.V * @fid: fid to issue attribute request for 19653c06f4eSAneesh Kumar K.V * @sb: superblock on which to create inode 19753c06f4eSAneesh Kumar K.V * 19853c06f4eSAneesh Kumar K.V */ 19953c06f4eSAneesh Kumar K.V static inline struct inode * 200a78ce05dSAneesh Kumar K.V v9fs_get_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 20153c06f4eSAneesh Kumar K.V struct super_block *sb) 20253c06f4eSAneesh Kumar K.V { 20353c06f4eSAneesh Kumar K.V if (v9fs_proto_dotl(v9ses)) 204ed80fcfaSAneesh Kumar K.V return v9fs_inode_from_fid_dotl(v9ses, fid, sb, 0); 20553c06f4eSAneesh Kumar K.V else 206ed80fcfaSAneesh Kumar K.V return v9fs_inode_from_fid(v9ses, fid, sb, 0); 20753c06f4eSAneesh Kumar K.V } 208ed80fcfaSAneesh Kumar K.V 209ed80fcfaSAneesh Kumar K.V /** 210ed80fcfaSAneesh Kumar K.V * v9fs_get_new_inode_from_fid - Helper routine to populate an inode by 211ed80fcfaSAneesh Kumar K.V * issuing a attribute request 212ed80fcfaSAneesh Kumar K.V * @v9ses: session information 213ed80fcfaSAneesh Kumar K.V * @fid: fid to issue attribute request for 214ed80fcfaSAneesh Kumar K.V * @sb: superblock on which to create inode 215ed80fcfaSAneesh Kumar K.V * 216ed80fcfaSAneesh Kumar K.V */ 217ed80fcfaSAneesh Kumar K.V static inline struct inode * 218ed80fcfaSAneesh Kumar K.V v9fs_get_new_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 219ed80fcfaSAneesh Kumar K.V struct super_block *sb) 220ed80fcfaSAneesh Kumar K.V { 221ed80fcfaSAneesh Kumar K.V if (v9fs_proto_dotl(v9ses)) 222ed80fcfaSAneesh Kumar K.V return v9fs_inode_from_fid_dotl(v9ses, fid, sb, 1); 223ed80fcfaSAneesh Kumar K.V else 224ed80fcfaSAneesh Kumar K.V return v9fs_inode_from_fid(v9ses, fid, sb, 1); 225ed80fcfaSAneesh Kumar K.V } 226ed80fcfaSAneesh Kumar K.V 227e0459f57SAneesh Kumar K.V #endif 228