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1 | #ifndef LINUX_EXPORTFS_H |
2 | #define LINUX_EXPORTFS_H 1 |
3 | |
4 | #include <linux/types.h> |
5 | |
6 | struct dentry; |
7 | struct inode; |
8 | struct super_block; |
9 | struct vfsmount; |
10 | |
11 | /* |
12 | * The fileid_type identifies how the file within the filesystem is encoded. |
13 | * In theory this is freely set and parsed by the filesystem, but we try to |
14 | * stick to conventions so we can share some generic code and don't confuse |
15 | * sniffers like ethereal/wireshark. |
16 | * |
17 | * The filesystem must not use the value '0' or '0xff'. |
18 | */ |
19 | enum fid_type { |
20 | /* |
21 | * The root, or export point, of the filesystem. |
22 | * (Never actually passed down to the filesystem. |
23 | */ |
24 | FILEID_ROOT = 0, |
25 | |
26 | /* |
27 | * 32bit inode number, 32 bit generation number. |
28 | */ |
29 | FILEID_INO32_GEN = 1, |
30 | |
31 | /* |
32 | * 32bit inode number, 32 bit generation number, |
33 | * 32 bit parent directory inode number. |
34 | */ |
35 | FILEID_INO32_GEN_PARENT = 2, |
36 | |
37 | /* |
38 | * 64 bit object ID, 64 bit root object ID, |
39 | * 32 bit generation number. |
40 | */ |
41 | FILEID_BTRFS_WITHOUT_PARENT = 0x4d, |
42 | |
43 | /* |
44 | * 64 bit object ID, 64 bit root object ID, |
45 | * 32 bit generation number, |
46 | * 64 bit parent object ID, 32 bit parent generation. |
47 | */ |
48 | FILEID_BTRFS_WITH_PARENT = 0x4e, |
49 | |
50 | /* |
51 | * 64 bit object ID, 64 bit root object ID, |
52 | * 32 bit generation number, |
53 | * 64 bit parent object ID, 32 bit parent generation, |
54 | * 64 bit parent root object ID. |
55 | */ |
56 | FILEID_BTRFS_WITH_PARENT_ROOT = 0x4f, |
57 | |
58 | /* |
59 | * 32 bit block number, 16 bit partition reference, |
60 | * 16 bit unused, 32 bit generation number. |
61 | */ |
62 | FILEID_UDF_WITHOUT_PARENT = 0x51, |
63 | |
64 | /* |
65 | * 32 bit block number, 16 bit partition reference, |
66 | * 16 bit unused, 32 bit generation number, |
67 | * 32 bit parent block number, 32 bit parent generation number |
68 | */ |
69 | FILEID_UDF_WITH_PARENT = 0x52, |
70 | }; |
71 | |
72 | struct fid { |
73 | union { |
74 | struct { |
75 | u32 ino; |
76 | u32 gen; |
77 | u32 parent_ino; |
78 | u32 parent_gen; |
79 | } i32; |
80 | struct { |
81 | u32 block; |
82 | u16 partref; |
83 | u16 parent_partref; |
84 | u32 generation; |
85 | u32 parent_block; |
86 | u32 parent_generation; |
87 | } udf; |
88 | __u32 raw[0]; |
89 | }; |
90 | }; |
91 | |
92 | /** |
93 | * struct export_operations - for nfsd to communicate with file systems |
94 | * @encode_fh: encode a file handle fragment from a dentry |
95 | * @fh_to_dentry: find the implied object and get a dentry for it |
96 | * @fh_to_parent: find the implied object's parent and get a dentry for it |
97 | * @get_name: find the name for a given inode in a given directory |
98 | * @get_parent: find the parent of a given directory |
99 | * |
100 | * See Documentation/filesystems/Exporting for details on how to use |
101 | * this interface correctly. |
102 | * |
103 | * encode_fh: |
104 | * @encode_fh should store in the file handle fragment @fh (using at most |
105 | * @max_len bytes) information that can be used by @decode_fh to recover the |
106 | * file refered to by the &struct dentry @de. If the @connectable flag is |
107 | * set, the encode_fh() should store sufficient information so that a good |
108 | * attempt can be made to find not only the file but also it's place in the |
109 | * filesystem. This typically means storing a reference to de->d_parent in |
110 | * the filehandle fragment. encode_fh() should return the number of bytes |
111 | * stored or a negative error code such as %-ENOSPC |
112 | * |
113 | * fh_to_dentry: |
114 | * @fh_to_dentry is given a &struct super_block (@sb) and a file handle |
115 | * fragment (@fh, @fh_len). It should return a &struct dentry which refers |
116 | * to the same file that the file handle fragment refers to. If it cannot, |
117 | * it should return a %NULL pointer if the file was found but no acceptable |
118 | * &dentries were available, or an %ERR_PTR error code indicating why it |
119 | * couldn't be found (e.g. %ENOENT or %ENOMEM). Any suitable dentry can be |
120 | * returned including, if necessary, a new dentry created with d_alloc_root. |
121 | * The caller can then find any other extant dentries by following the |
122 | * d_alias links. |
123 | * |
124 | * fh_to_parent: |
125 | * Same as @fh_to_dentry, except that it returns a pointer to the parent |
126 | * dentry if it was encoded into the filehandle fragment by @encode_fh. |
127 | * |
128 | * get_name: |
129 | * @get_name should find a name for the given @child in the given @parent |
130 | * directory. The name should be stored in the @name (with the |
131 | * understanding that it is already pointing to a a %NAME_MAX+1 sized |
132 | * buffer. get_name() should return %0 on success, a negative error code |
133 | * or error. @get_name will be called without @parent->i_mutex held. |
134 | * |
135 | * get_parent: |
136 | * @get_parent should find the parent directory for the given @child which |
137 | * is also a directory. In the event that it cannot be found, or storage |
138 | * space cannot be allocated, a %ERR_PTR should be returned. |
139 | * |
140 | * Locking rules: |
141 | * get_parent is called with child->d_inode->i_mutex down |
142 | * get_name is not (which is possibly inconsistent) |
143 | */ |
144 | |
145 | struct export_operations { |
146 | int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len, |
147 | int connectable); |
148 | struct dentry * (*fh_to_dentry)(struct super_block *sb, struct fid *fid, |
149 | int fh_len, int fh_type); |
150 | struct dentry * (*fh_to_parent)(struct super_block *sb, struct fid *fid, |
151 | int fh_len, int fh_type); |
152 | int (*get_name)(struct dentry *parent, char *name, |
153 | struct dentry *child); |
154 | struct dentry * (*get_parent)(struct dentry *child); |
155 | }; |
156 | |
157 | extern int exportfs_encode_fh(struct dentry *dentry, struct fid *fid, |
158 | int *max_len, int connectable); |
159 | extern struct dentry *exportfs_decode_fh(struct vfsmount *mnt, struct fid *fid, |
160 | int fh_len, int fileid_type, int (*acceptable)(void *, struct dentry *), |
161 | void *context); |
162 | |
163 | /* |
164 | * Generic helpers for filesystems. |
165 | */ |
166 | extern struct dentry *generic_fh_to_dentry(struct super_block *sb, |
167 | struct fid *fid, int fh_len, int fh_type, |
168 | struct inode *(*get_inode) (struct super_block *sb, u64 ino, u32 gen)); |
169 | extern struct dentry *generic_fh_to_parent(struct super_block *sb, |
170 | struct fid *fid, int fh_len, int fh_type, |
171 | struct inode *(*get_inode) (struct super_block *sb, u64 ino, u32 gen)); |
172 | |
173 | #endif /* LINUX_EXPORTFS_H */ |
174 |
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