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TOMOYO Linux Cross Reference
Linux/fs/9p/v9fs.h

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  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 #ifndef FS_9P_V9FS_H
 24 #define FS_9P_V9FS_H
 25 
 26 #include <linux/backing-dev.h>
 27 
 28 /**
 29  * enum p9_session_flags - option flags for each 9P session
 30  * @V9FS_PROTO_2000U: whether or not to use 9P2000.u extensions
 31  * @V9FS_PROTO_2000L: whether or not to use 9P2000.l extensions
 32  * @V9FS_ACCESS_SINGLE: only the mounting user can access the hierarchy
 33  * @V9FS_ACCESS_USER: a new attach will be issued for every user (default)
 34  * @V9FS_ACCESS_CLIENT: Just like user, but access check is performed on client.
 35  * @V9FS_ACCESS_ANY: use a single attach for all users
 36  * @V9FS_ACCESS_MASK: bit mask of different ACCESS options
 37  * @V9FS_POSIX_ACL: POSIX ACLs are enforced
 38  *
 39  * Session flags reflect options selected by users at mount time
 40  */
 41 #define V9FS_ACCESS_ANY (V9FS_ACCESS_SINGLE | \
 42                          V9FS_ACCESS_USER |   \
 43                          V9FS_ACCESS_CLIENT)
 44 #define V9FS_ACCESS_MASK V9FS_ACCESS_ANY
 45 #define V9FS_ACL_MASK V9FS_POSIX_ACL
 46 
 47 enum p9_session_flags {
 48         V9FS_PROTO_2000U        = 0x01,
 49         V9FS_PROTO_2000L        = 0x02,
 50         V9FS_ACCESS_SINGLE      = 0x04,
 51         V9FS_ACCESS_USER        = 0x08,
 52         V9FS_ACCESS_CLIENT      = 0x10,
 53         V9FS_POSIX_ACL          = 0x20
 54 };
 55 
 56 /* possible values of ->cache */
 57 /**
 58  * enum p9_cache_modes - user specified cache preferences
 59  * @CACHE_NONE: do not cache data, dentries, or directory contents (default)
 60  * @CACHE_LOOSE: cache data, dentries, and directory contents w/no consistency
 61  *
 62  * eventually support loose, tight, time, session, default always none
 63  */
 64 
 65 enum p9_cache_modes {
 66         CACHE_NONE,
 67         CACHE_MMAP,
 68         CACHE_LOOSE,
 69         CACHE_FSCACHE,
 70 };
 71 
 72 /**
 73  * struct v9fs_session_info - per-instance session information
 74  * @flags: session options of type &p9_session_flags
 75  * @nodev: set to 1 to disable device mapping
 76  * @debug: debug level
 77  * @afid: authentication handle
 78  * @cache: cache mode of type &p9_cache_modes
 79  * @cachetag: the tag of the cache associated with this session
 80  * @fscache: session cookie associated with FS-Cache
 81  * @uname: string user name to mount hierarchy as
 82  * @aname: mount specifier for remote hierarchy
 83  * @maxdata: maximum data to be sent/recvd per protocol message
 84  * @dfltuid: default numeric userid to mount hierarchy as
 85  * @dfltgid: default numeric groupid to mount hierarchy as
 86  * @uid: if %V9FS_ACCESS_SINGLE, the numeric uid which mounted the hierarchy
 87  * @clnt: reference to 9P network client instantiated for this session
 88  * @slist: reference to list of registered 9p sessions
 89  *
 90  * This structure holds state for each session instance established during
 91  * a sys_mount() .
 92  *
 93  * Bugs: there seems to be a lot of state which could be condensed and/or
 94  * removed.
 95  */
 96 
 97 struct v9fs_session_info {
 98         /* options */
 99         unsigned char flags;
100         unsigned char nodev;
101         unsigned short debug;
102         unsigned int afid;
103         unsigned int cache;
104 #ifdef CONFIG_9P_FSCACHE
105         char *cachetag;
106         struct fscache_cookie *fscache;
107 #endif
108 
109         char *uname;            /* user name to mount as */
110         char *aname;            /* name of remote hierarchy being mounted */
111         unsigned int maxdata;   /* max data for client interface */
112         kuid_t dfltuid;         /* default uid/muid for legacy support */
113         kgid_t dfltgid;         /* default gid for legacy support */
114         kuid_t uid;             /* if ACCESS_SINGLE, the uid that has access */
115         struct p9_client *clnt; /* 9p client */
116         struct list_head slist; /* list of sessions registered with v9fs */
117         struct backing_dev_info bdi;
118         struct rw_semaphore rename_sem;
119 };
120 
121 /* cache_validity flags */
122 #define V9FS_INO_INVALID_ATTR 0x01
123 
124 struct v9fs_inode {
125 #ifdef CONFIG_9P_FSCACHE
126         spinlock_t fscache_lock;
127         struct fscache_cookie *fscache;
128 #endif
129         struct p9_qid qid;
130         unsigned int cache_validity;
131         struct p9_fid *writeback_fid;
132         struct mutex v_mutex;
133         struct inode vfs_inode;
134 };
135 
136 static inline struct v9fs_inode *V9FS_I(const struct inode *inode)
137 {
138         return container_of(inode, struct v9fs_inode, vfs_inode);
139 }
140 
141 struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *,
142                                                                         char *);
143 extern void v9fs_session_close(struct v9fs_session_info *v9ses);
144 extern void v9fs_session_cancel(struct v9fs_session_info *v9ses);
145 extern void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses);
146 extern struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
147                         unsigned int flags);
148 extern int v9fs_vfs_unlink(struct inode *i, struct dentry *d);
149 extern int v9fs_vfs_rmdir(struct inode *i, struct dentry *d);
150 extern int v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
151                         struct inode *new_dir, struct dentry *new_dentry);
152 extern void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd,
153                         void *p);
154 extern struct inode *v9fs_inode_from_fid(struct v9fs_session_info *v9ses,
155                                          struct p9_fid *fid,
156                                          struct super_block *sb, int new);
157 extern const struct inode_operations v9fs_dir_inode_operations_dotl;
158 extern const struct inode_operations v9fs_file_inode_operations_dotl;
159 extern const struct inode_operations v9fs_symlink_inode_operations_dotl;
160 extern struct inode *v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses,
161                                               struct p9_fid *fid,
162                                               struct super_block *sb, int new);
163 
164 /* other default globals */
165 #define V9FS_PORT       564
166 #define V9FS_DEFUSER    "nobody"
167 #define V9FS_DEFANAME   ""
168 #define V9FS_DEFUID     KUIDT_INIT(-2)
169 #define V9FS_DEFGID     KGIDT_INIT(-2)
170 
171 static inline struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode)
172 {
173         return (inode->i_sb->s_fs_info);
174 }
175 
176 static inline struct v9fs_session_info *v9fs_dentry2v9ses(struct dentry *dentry)
177 {
178         return dentry->d_sb->s_fs_info;
179 }
180 
181 static inline int v9fs_proto_dotu(struct v9fs_session_info *v9ses)
182 {
183         return v9ses->flags & V9FS_PROTO_2000U;
184 }
185 
186 static inline int v9fs_proto_dotl(struct v9fs_session_info *v9ses)
187 {
188         return v9ses->flags & V9FS_PROTO_2000L;
189 }
190 
191 /**
192  * v9fs_get_inode_from_fid - Helper routine to populate an inode by
193  * issuing a attribute request
194  * @v9ses: session information
195  * @fid: fid to issue attribute request for
196  * @sb: superblock on which to create inode
197  *
198  */
199 static inline struct inode *
200 v9fs_get_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
201                         struct super_block *sb)
202 {
203         if (v9fs_proto_dotl(v9ses))
204                 return v9fs_inode_from_fid_dotl(v9ses, fid, sb, 0);
205         else
206                 return v9fs_inode_from_fid(v9ses, fid, sb, 0);
207 }
208 
209 /**
210  * v9fs_get_new_inode_from_fid - Helper routine to populate an inode by
211  * issuing a attribute request
212  * @v9ses: session information
213  * @fid: fid to issue attribute request for
214  * @sb: superblock on which to create inode
215  *
216  */
217 static inline struct inode *
218 v9fs_get_new_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
219                             struct super_block *sb)
220 {
221         if (v9fs_proto_dotl(v9ses))
222                 return v9fs_inode_from_fid_dotl(v9ses, fid, sb, 1);
223         else
224                 return v9fs_inode_from_fid(v9ses, fid, sb, 1);
225 }
226 
227 #endif
228 

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