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

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*
  3  * V9FS definitions.
  4  *
  5  *  Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
  6  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
  7  */
  8 #ifndef FS_9P_V9FS_H
  9 #define FS_9P_V9FS_H
 10 
 11 #include <linux/backing-dev.h>
 12 
 13 /**
 14  * enum p9_session_flags - option flags for each 9P session
 15  * @V9FS_PROTO_2000U: whether or not to use 9P2000.u extensions
 16  * @V9FS_PROTO_2000L: whether or not to use 9P2000.l extensions
 17  * @V9FS_ACCESS_SINGLE: only the mounting user can access the hierarchy
 18  * @V9FS_ACCESS_USER: a new attach will be issued for every user (default)
 19  * @V9FS_ACCESS_CLIENT: Just like user, but access check is performed on client.
 20  * @V9FS_ACCESS_ANY: use a single attach for all users
 21  * @V9FS_ACCESS_MASK: bit mask of different ACCESS options
 22  * @V9FS_POSIX_ACL: POSIX ACLs are enforced
 23  *
 24  * Session flags reflect options selected by users at mount time
 25  */
 26 #define V9FS_ACCESS_ANY (V9FS_ACCESS_SINGLE | \
 27                          V9FS_ACCESS_USER |   \
 28                          V9FS_ACCESS_CLIENT)
 29 #define V9FS_ACCESS_MASK V9FS_ACCESS_ANY
 30 #define V9FS_ACL_MASK V9FS_POSIX_ACL
 31 
 32 enum p9_session_flags {
 33         V9FS_PROTO_2000U        = 0x01,
 34         V9FS_PROTO_2000L        = 0x02,
 35         V9FS_ACCESS_SINGLE      = 0x04,
 36         V9FS_ACCESS_USER        = 0x08,
 37         V9FS_ACCESS_CLIENT      = 0x10,
 38         V9FS_POSIX_ACL          = 0x20
 39 };
 40 
 41 /* possible values of ->cache */
 42 /**
 43  * enum p9_cache_modes - user specified cache preferences
 44  * @CACHE_NONE: do not cache data, dentries, or directory contents (default)
 45  * @CACHE_LOOSE: cache data, dentries, and directory contents w/no consistency
 46  *
 47  * eventually support loose, tight, time, session, default always none
 48  */
 49 
 50 enum p9_cache_modes {
 51         CACHE_NONE,
 52         CACHE_MMAP,
 53         CACHE_LOOSE,
 54         CACHE_FSCACHE,
 55         nr__p9_cache_modes
 56 };
 57 
 58 /**
 59  * struct v9fs_session_info - per-instance session information
 60  * @flags: session options of type &p9_session_flags
 61  * @nodev: set to 1 to disable device mapping
 62  * @debug: debug level
 63  * @afid: authentication handle
 64  * @cache: cache mode of type &p9_cache_modes
 65  * @cachetag: the tag of the cache associated with this session
 66  * @fscache: session cookie associated with FS-Cache
 67  * @uname: string user name to mount hierarchy as
 68  * @aname: mount specifier for remote hierarchy
 69  * @maxdata: maximum data to be sent/recvd per protocol message
 70  * @dfltuid: default numeric userid to mount hierarchy as
 71  * @dfltgid: default numeric groupid to mount hierarchy as
 72  * @uid: if %V9FS_ACCESS_SINGLE, the numeric uid which mounted the hierarchy
 73  * @clnt: reference to 9P network client instantiated for this session
 74  * @slist: reference to list of registered 9p sessions
 75  *
 76  * This structure holds state for each session instance established during
 77  * a sys_mount() .
 78  *
 79  * Bugs: there seems to be a lot of state which could be condensed and/or
 80  * removed.
 81  */
 82 
 83 struct v9fs_session_info {
 84         /* options */
 85         unsigned char flags;
 86         unsigned char nodev;
 87         unsigned short debug;
 88         unsigned int afid;
 89         unsigned int cache;
 90 #ifdef CONFIG_9P_FSCACHE
 91         char *cachetag;
 92         struct fscache_cookie *fscache;
 93 #endif
 94 
 95         char *uname;            /* user name to mount as */
 96         char *aname;            /* name of remote hierarchy being mounted */
 97         unsigned int maxdata;   /* max data for client interface */
 98         kuid_t dfltuid;         /* default uid/muid for legacy support */
 99         kgid_t dfltgid;         /* default gid for legacy support */
100         kuid_t uid;             /* if ACCESS_SINGLE, the uid that has access */
101         struct p9_client *clnt; /* 9p client */
102         struct list_head slist; /* list of sessions registered with v9fs */
103         struct rw_semaphore rename_sem;
104         long session_lock_timeout; /* retry interval for blocking locks */
105 };
106 
107 /* cache_validity flags */
108 #define V9FS_INO_INVALID_ATTR 0x01
109 
110 struct v9fs_inode {
111 #ifdef CONFIG_9P_FSCACHE
112         struct mutex fscache_lock;
113         struct fscache_cookie *fscache;
114 #endif
115         struct p9_qid qid;
116         unsigned int cache_validity;
117         struct p9_fid *writeback_fid;
118         struct mutex v_mutex;
119         struct inode vfs_inode;
120 };
121 
122 static inline struct v9fs_inode *V9FS_I(const struct inode *inode)
123 {
124         return container_of(inode, struct v9fs_inode, vfs_inode);
125 }
126 
127 extern int v9fs_show_options(struct seq_file *m, struct dentry *root);
128 
129 struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *,
130                                                                         char *);
131 extern void v9fs_session_close(struct v9fs_session_info *v9ses);
132 extern void v9fs_session_cancel(struct v9fs_session_info *v9ses);
133 extern void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses);
134 extern struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
135                         unsigned int flags);
136 extern int v9fs_vfs_unlink(struct inode *i, struct dentry *d);
137 extern int v9fs_vfs_rmdir(struct inode *i, struct dentry *d);
138 extern int v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
139                            struct inode *new_dir, struct dentry *new_dentry,
140                            unsigned int flags);
141 extern struct inode *v9fs_inode_from_fid(struct v9fs_session_info *v9ses,
142                                          struct p9_fid *fid,
143                                          struct super_block *sb, int new);
144 extern const struct inode_operations v9fs_dir_inode_operations_dotl;
145 extern const struct inode_operations v9fs_file_inode_operations_dotl;
146 extern const struct inode_operations v9fs_symlink_inode_operations_dotl;
147 extern struct inode *v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses,
148                                               struct p9_fid *fid,
149                                               struct super_block *sb, int new);
150 
151 /* other default globals */
152 #define V9FS_PORT       564
153 #define V9FS_DEFUSER    "nobody"
154 #define V9FS_DEFANAME   ""
155 #define V9FS_DEFUID     KUIDT_INIT(-2)
156 #define V9FS_DEFGID     KGIDT_INIT(-2)
157 
158 static inline struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode)
159 {
160         return (inode->i_sb->s_fs_info);
161 }
162 
163 static inline struct v9fs_session_info *v9fs_dentry2v9ses(struct dentry *dentry)
164 {
165         return dentry->d_sb->s_fs_info;
166 }
167 
168 static inline int v9fs_proto_dotu(struct v9fs_session_info *v9ses)
169 {
170         return v9ses->flags & V9FS_PROTO_2000U;
171 }
172 
173 static inline int v9fs_proto_dotl(struct v9fs_session_info *v9ses)
174 {
175         return v9ses->flags & V9FS_PROTO_2000L;
176 }
177 
178 /**
179  * v9fs_get_inode_from_fid - Helper routine to populate an inode by
180  * issuing a attribute request
181  * @v9ses: session information
182  * @fid: fid to issue attribute request for
183  * @sb: superblock on which to create inode
184  *
185  */
186 static inline struct inode *
187 v9fs_get_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
188                         struct super_block *sb)
189 {
190         if (v9fs_proto_dotl(v9ses))
191                 return v9fs_inode_from_fid_dotl(v9ses, fid, sb, 0);
192         else
193                 return v9fs_inode_from_fid(v9ses, fid, sb, 0);
194 }
195 
196 /**
197  * v9fs_get_new_inode_from_fid - Helper routine to populate an inode by
198  * issuing a attribute request
199  * @v9ses: session information
200  * @fid: fid to issue attribute request for
201  * @sb: superblock on which to create inode
202  *
203  */
204 static inline struct inode *
205 v9fs_get_new_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
206                             struct super_block *sb)
207 {
208         if (v9fs_proto_dotl(v9ses))
209                 return v9fs_inode_from_fid_dotl(v9ses, fid, sb, 1);
210         else
211                 return v9fs_inode_from_fid(v9ses, fid, sb, 1);
212 }
213 
214 #endif
215 

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