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9e82cf6a EVH |
1 | /* |
2 | * V9FS definitions. | |
3 | * | |
8a0dc95f | 4 | * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> |
9e82cf6a EVH |
5 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
42e8c509 EVH |
8 | * it under the terms of the GNU General Public License version 2 |
9 | * as published by the Free Software Foundation. | |
9e82cf6a EVH |
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 | */ | |
0ed07ddb | 23 | #include <linux/backing-dev.h> |
9e82cf6a | 24 | |
ee443996 EVH |
25 | /** |
26 | * enum p9_session_flags - option flags for each 9P session | |
dd6102fb | 27 | * @V9FS_PROTO_2000U: whether or not to use 9P2000.u extensions |
45bc21ed | 28 | * @V9FS_PROTO_2000L: whether or not to use 9P2000.l extensions |
ee443996 EVH |
29 | * @V9FS_ACCESS_SINGLE: only the mounting user can access the hierarchy |
30 | * @V9FS_ACCESS_USER: a new attach will be issued for every user (default) | |
e782ef71 | 31 | * @V9FS_ACCESS_CLIENT: Just like user, but access check is performed on client. |
ee443996 EVH |
32 | * @V9FS_ACCESS_ANY: use a single attach for all users |
33 | * @V9FS_ACCESS_MASK: bit mask of different ACCESS options | |
e782ef71 | 34 | * @V9FS_POSIX_ACL: POSIX ACLs are enforced |
ee443996 EVH |
35 | * |
36 | * Session flags reflect options selected by users at mount time | |
37 | */ | |
76381a42 AK |
38 | #define V9FS_ACCESS_ANY (V9FS_ACCESS_SINGLE | \ |
39 | V9FS_ACCESS_USER | \ | |
40 | V9FS_ACCESS_CLIENT) | |
41 | #define V9FS_ACCESS_MASK V9FS_ACCESS_ANY | |
e782ef71 | 42 | #define V9FS_ACL_MASK V9FS_POSIX_ACL |
76381a42 | 43 | |
ee443996 | 44 | enum p9_session_flags { |
dd6102fb | 45 | V9FS_PROTO_2000U = 0x01, |
45bc21ed | 46 | V9FS_PROTO_2000L = 0x02, |
dd6102fb SK |
47 | V9FS_ACCESS_SINGLE = 0x04, |
48 | V9FS_ACCESS_USER = 0x08, | |
e782ef71 VJJ |
49 | V9FS_ACCESS_CLIENT = 0x10, |
50 | V9FS_POSIX_ACL = 0x20 | |
ee443996 EVH |
51 | }; |
52 | ||
53 | /* possible values of ->cache */ | |
54 | /** | |
55 | * enum p9_cache_modes - user specified cache preferences | |
56 | * @CACHE_NONE: do not cache data, dentries, or directory contents (default) | |
57 | * @CACHE_LOOSE: cache data, dentries, and directory contents w/no consistency | |
58 | * | |
59 | * eventually support loose, tight, time, session, default always none | |
60 | */ | |
61 | ||
62 | enum p9_cache_modes { | |
63 | CACHE_NONE, | |
64 | CACHE_LOOSE, | |
60e78d2c | 65 | CACHE_FSCACHE, |
ee443996 EVH |
66 | }; |
67 | ||
68 | /** | |
69 | * struct v9fs_session_info - per-instance session information | |
70 | * @flags: session options of type &p9_session_flags | |
71 | * @nodev: set to 1 to disable device mapping | |
72 | * @debug: debug level | |
73 | * @afid: authentication handle | |
74 | * @cache: cache mode of type &p9_cache_modes | |
60e78d2c AK |
75 | * @cachetag: the tag of the cache associated with this session |
76 | * @fscache: session cookie associated with FS-Cache | |
ee443996 EVH |
77 | * @options: copy of options string given by user |
78 | * @uname: string user name to mount hierarchy as | |
79 | * @aname: mount specifier for remote hierarchy | |
80 | * @maxdata: maximum data to be sent/recvd per protocol message | |
81 | * @dfltuid: default numeric userid to mount hierarchy as | |
82 | * @dfltgid: default numeric groupid to mount hierarchy as | |
83 | * @uid: if %V9FS_ACCESS_SINGLE, the numeric uid which mounted the hierarchy | |
84 | * @clnt: reference to 9P network client instantiated for this session | |
60e78d2c | 85 | * @slist: reference to list of registered 9p sessions |
ee443996 EVH |
86 | * |
87 | * This structure holds state for each session instance established during | |
88 | * a sys_mount() . | |
89 | * | |
90 | * Bugs: there seems to be a lot of state which could be condensed and/or | |
91 | * removed. | |
92 | */ | |
9e82cf6a EVH |
93 | |
94 | struct v9fs_session_info { | |
95 | /* options */ | |
ee443996 EVH |
96 | unsigned char flags; |
97 | unsigned char nodev; | |
98 | unsigned short debug; | |
99 | unsigned int afid; | |
100 | unsigned int cache; | |
60e78d2c AK |
101 | #ifdef CONFIG_9P_FSCACHE |
102 | char *cachetag; | |
103 | struct fscache_cookie *fscache; | |
104 | #endif | |
9e82cf6a | 105 | |
ba17674f LI |
106 | char *uname; /* user name to mount as */ |
107 | char *aname; /* name of remote hierarchy being mounted */ | |
8a0dc95f | 108 | unsigned int maxdata; /* max data for client interface */ |
bd32b82d LI |
109 | unsigned int dfltuid; /* default uid/muid for legacy support */ |
110 | unsigned int dfltgid; /* default gid for legacy support */ | |
ba17674f | 111 | u32 uid; /* if ACCESS_SINGLE, the uid that has access */ |
bd238fb4 | 112 | struct p9_client *clnt; /* 9p client */ |
60e78d2c | 113 | struct list_head slist; /* list of sessions registered with v9fs */ |
0ed07ddb | 114 | struct backing_dev_info bdi; |
a534c8d1 | 115 | struct rw_semaphore rename_sem; |
00ea2df4 | 116 | struct p9_fid *root_fid; /* Used for file system sync */ |
9e82cf6a EVH |
117 | }; |
118 | ||
a78ce05d AK |
119 | struct v9fs_inode { |
120 | #ifdef CONFIG_9P_FSCACHE | |
121 | spinlock_t fscache_lock; | |
122 | struct fscache_cookie *fscache; | |
123 | struct p9_qid *fscache_key; | |
124 | #endif | |
6b39f6d2 | 125 | struct p9_fid *writeback_fid; |
a78ce05d AK |
126 | struct inode vfs_inode; |
127 | }; | |
128 | ||
129 | static inline struct v9fs_inode *V9FS_I(const struct inode *inode) | |
130 | { | |
131 | return container_of(inode, struct v9fs_inode, vfs_inode); | |
132 | } | |
133 | ||
bd238fb4 LI |
134 | struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *, |
135 | char *); | |
53c06f4e AK |
136 | extern void v9fs_session_close(struct v9fs_session_info *v9ses); |
137 | extern void v9fs_session_cancel(struct v9fs_session_info *v9ses); | |
138 | extern void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses); | |
139 | extern struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
140 | struct nameidata *nameidata); | |
141 | extern int v9fs_vfs_unlink(struct inode *i, struct dentry *d); | |
142 | extern int v9fs_vfs_rmdir(struct inode *i, struct dentry *d); | |
143 | extern int v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
144 | struct inode *new_dir, struct dentry *new_dentry); | |
145 | extern void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, | |
146 | void *p); | |
a78ce05d AK |
147 | extern struct inode *v9fs_inode_from_fid(struct v9fs_session_info *v9ses, |
148 | struct p9_fid *fid, | |
149 | struct super_block *sb); | |
53c06f4e AK |
150 | extern const struct inode_operations v9fs_dir_inode_operations_dotl; |
151 | extern const struct inode_operations v9fs_file_inode_operations_dotl; | |
152 | extern const struct inode_operations v9fs_symlink_inode_operations_dotl; | |
a78ce05d AK |
153 | extern struct inode *v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, |
154 | struct p9_fid *fid, | |
155 | struct super_block *sb); | |
9e82cf6a | 156 | |
9e82cf6a | 157 | /* other default globals */ |
bd32b82d | 158 | #define V9FS_PORT 564 |
9e82cf6a EVH |
159 | #define V9FS_DEFUSER "nobody" |
160 | #define V9FS_DEFANAME "" | |
bd32b82d LI |
161 | #define V9FS_DEFUID (-2) |
162 | #define V9FS_DEFGID (-2) | |
9e82cf6a | 163 | |
bd238fb4 LI |
164 | static inline struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode) |
165 | { | |
166 | return (inode->i_sb->s_fs_info); | |
167 | } | |
2405669b | 168 | |
dd6102fb | 169 | static inline int v9fs_proto_dotu(struct v9fs_session_info *v9ses) |
2405669b | 170 | { |
dd6102fb SK |
171 | return v9ses->flags & V9FS_PROTO_2000U; |
172 | } | |
173 | ||
174 | static inline int v9fs_proto_dotl(struct v9fs_session_info *v9ses) | |
175 | { | |
45bc21ed | 176 | return v9ses->flags & V9FS_PROTO_2000L; |
2405669b | 177 | } |
53c06f4e AK |
178 | |
179 | /** | |
a78ce05d | 180 | * v9fs_get_inode_from_fid - Helper routine to populate an inode by |
53c06f4e AK |
181 | * issuing a attribute request |
182 | * @v9ses: session information | |
183 | * @fid: fid to issue attribute request for | |
184 | * @sb: superblock on which to create inode | |
185 | * | |
186 | */ | |
187 | static inline struct inode * | |
a78ce05d AK |
188 | v9fs_get_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
189 | struct super_block *sb) | |
53c06f4e AK |
190 | { |
191 | if (v9fs_proto_dotl(v9ses)) | |
a78ce05d | 192 | return v9fs_inode_from_fid_dotl(v9ses, fid, sb); |
53c06f4e | 193 | else |
a78ce05d | 194 | return v9fs_inode_from_fid(v9ses, fid, sb); |
53c06f4e | 195 | } |