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1 | /* |
1 | /* |
2 | * Copyright (c) 2007 Jakub Jermar |
2 | * Copyright (c) 2007 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup fs |
29 | /** @addtogroup fs |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | 32 | ||
33 | #ifndef VFS_VFS_H_ |
33 | #ifndef VFS_VFS_H_ |
34 | #define VFS_VFS_H_ |
34 | #define VFS_VFS_H_ |
35 | 35 | ||
36 | #include <ipc/ipc.h> |
36 | #include <ipc/ipc.h> |
37 | #include <libadt/list.h> |
37 | #include <libadt/list.h> |
38 | #include <atomic.h> |
38 | #include <atomic.h> |
39 | #include <types.h> |
39 | #include <sys/types.h> |
40 | 40 | ||
41 | #define dprintf(...) printf(__VA_ARGS__) |
41 | #define dprintf(...) printf(__VA_ARGS__) |
42 | 42 | ||
43 | #define VFS_FIRST FIRST_USER_METHOD |
43 | #define VFS_FIRST FIRST_USER_METHOD |
44 | 44 | ||
45 | #define IPC_METHOD_TO_VFS_OP(m) ((m) - VFS_FIRST) |
45 | #define IPC_METHOD_TO_VFS_OP(m) ((m) - VFS_FIRST) |
46 | 46 | ||
47 | typedef int64_t off_t; |
- | |
48 | - | ||
49 | typedef enum { |
47 | typedef enum { |
50 | VFS_REGISTER = VFS_FIRST, |
48 | VFS_REGISTER = VFS_FIRST, |
51 | VFS_MOUNT, |
49 | VFS_MOUNT, |
52 | VFS_UNMOUNT, |
50 | VFS_UNMOUNT, |
53 | VFS_LOOKUP, |
51 | VFS_LOOKUP, |
54 | VFS_OPEN, |
52 | VFS_OPEN, |
55 | VFS_CREATE, |
53 | VFS_CREATE, |
56 | VFS_CLOSE, |
54 | VFS_CLOSE, |
57 | VFS_READ, |
55 | VFS_READ, |
58 | VFS_WRITE, |
56 | VFS_WRITE, |
59 | VFS_SEEK, |
57 | VFS_SEEK, |
60 | VFS_LAST, /* keep this the last member of the enum */ |
58 | VFS_LAST, /* keep this the last member of the enum */ |
61 | } vfs_request_t; |
59 | } vfs_request_t; |
62 | 60 | ||
63 | 61 | ||
64 | /** |
62 | /** |
65 | * An instance of this structure is associated with a particular FS operation. |
63 | * An instance of this structure is associated with a particular FS operation. |
66 | * It tells VFS if the FS supports the operation or maybe if a default one |
64 | * It tells VFS if the FS supports the operation or maybe if a default one |
67 | * should be used. |
65 | * should be used. |
68 | */ |
66 | */ |
69 | typedef enum { |
67 | typedef enum { |
70 | VFS_OP_NULL = 0, |
68 | VFS_OP_NULL = 0, |
71 | VFS_OP_DEFAULT, |
69 | VFS_OP_DEFAULT, |
72 | VFS_OP_DEFINED |
70 | VFS_OP_DEFINED |
73 | } vfs_op_t; |
71 | } vfs_op_t; |
74 | 72 | ||
75 | #define FS_NAME_MAXLEN 20 |
73 | #define FS_NAME_MAXLEN 20 |
76 | 74 | ||
77 | /** |
75 | /** |
78 | * A structure like this is passed to VFS by each individual FS upon its |
76 | * A structure like this is passed to VFS by each individual FS upon its |
79 | * registration. It assosiates a human-readable identifier with each |
77 | * registration. It assosiates a human-readable identifier with each |
80 | * registered FS. More importantly, through this structure, the FS announces |
78 | * registered FS. More importantly, through this structure, the FS announces |
81 | * what operations it supports. |
79 | * what operations it supports. |
82 | */ |
80 | */ |
83 | typedef struct { |
81 | typedef struct { |
84 | /** Unique identifier of the fs. */ |
82 | /** Unique identifier of the fs. */ |
85 | char name[FS_NAME_MAXLEN]; |
83 | char name[FS_NAME_MAXLEN]; |
86 | 84 | ||
87 | /** Operations. */ |
85 | /** Operations. */ |
88 | vfs_op_t ops[VFS_LAST - VFS_FIRST]; |
86 | vfs_op_t ops[VFS_LAST - VFS_FIRST]; |
89 | } vfs_info_t; |
87 | } vfs_info_t; |
90 | 88 | ||
91 | /** |
89 | /** |
92 | * A structure like this will be allocated for each registered file system. |
90 | * A structure like this will be allocated for each registered file system. |
93 | */ |
91 | */ |
94 | typedef struct { |
92 | typedef struct { |
95 | link_t fs_link; |
93 | link_t fs_link; |
96 | vfs_info_t vfs_info; |
94 | vfs_info_t vfs_info; |
97 | ipcarg_t phone; |
95 | ipcarg_t phone; |
98 | } fs_info_t; |
96 | } fs_info_t; |
99 | 97 | ||
100 | /** |
98 | /** |
101 | * Instances of this type represent a file system node (e.g. directory, file). |
99 | * Instances of this type represent a file system node (e.g. directory, file). |
102 | * They are abstracted away from any file system implementation and contain just |
100 | * They are abstracted away from any file system implementation and contain just |
103 | * enough bits to uniquely identify the object in its file system instance. |
101 | * enough bits to uniquely identify the object in its file system instance. |
104 | * |
102 | * |
105 | * @note fs_handle, dev_handle and index are meant to be returned in one |
103 | * @note fs_handle, dev_handle and index are meant to be returned in one |
106 | * IPC reply. |
104 | * IPC reply. |
107 | */ |
105 | */ |
108 | typedef struct { |
106 | typedef struct { |
109 | int fs_handle; /**< Global file system ID. */ |
107 | int fs_handle; /**< Global file system ID. */ |
110 | int dev_handle; /**< Global mount device devno. */ |
108 | int dev_handle; /**< Global mount device devno. */ |
111 | uint64_t index; /**< Index of the node on its file system. */ |
109 | uint64_t index; /**< Index of the node on its file system. */ |
112 | } vfs_node_t; |
110 | } vfs_node_t; |
113 | 111 | ||
114 | /** |
112 | /** |
115 | * Instances of this type represent an open file. If the file is opened by more |
113 | * Instances of this type represent an open file. If the file is opened by more |
116 | * than one task, there will be a separate structure allocated for each task. |
114 | * than one task, there will be a separate structure allocated for each task. |
117 | */ |
115 | */ |
118 | typedef struct { |
116 | typedef struct { |
119 | vfs_node_t *node; |
117 | vfs_node_t *node; |
120 | 118 | ||
121 | /** Number of file handles referencing this file. */ |
119 | /** Number of file handles referencing this file. */ |
122 | atomic_t refcnt; |
120 | atomic_t refcnt; |
123 | 121 | ||
124 | /** Current position in the file. */ |
122 | /** Current position in the file. */ |
125 | off_t pos; |
123 | off_t pos; |
126 | } vfs_file_t; |
124 | } vfs_file_t; |
127 | 125 | ||
- | 126 | extern link_t fs_head; /**< List of registered file systems. */ |
|
- | 127 | ||
- | 128 | extern vfs_node_t *rootfs; /**< Root node of the root file system. */ |
|
- | 129 | ||
- | 130 | #define MAX_PATH_LEN (64 * 1024) |
|
- | 131 | ||
- | 132 | #define PLB_SIZE (2 * MAX_PATH_LEN) |
|
- | 133 | ||
- | 134 | /** Each instance of this type describes one path lookup in progress. */ |
|
- | 135 | typedef struct { |
|
- | 136 | link_t plb_link; /**< Active PLB entries list link. */ |
|
- | 137 | unsigned index; /**< Index of the first character in PLB. */ |
|
- | 138 | size_t len; /**< Number of characters in this PLB entry. */ |
|
128 | extern link_t fs_head; |
139 | } plb_entry_t; |
- | 140 | ||
- | 141 | extern atomic_t plb_futex; /**< Futex protecting plb and plb_head. */ |
|
- | 142 | extern uint8_t *plb; /**< Path Lookup Buffer */ |
|
- | 143 | extern link_t plb_head; /**< List of active PLB entries. */ |
|
129 | 144 | ||
130 | extern void vfs_register(ipc_callid_t rid, ipc_call_t *request); |
145 | extern void vfs_register(ipc_callid_t, ipc_call_t *); |
- | 146 | extern void vfs_lookup(ipc_callid_t, ipc_call_t *); |
|
131 | 147 | ||
132 | #endif |
148 | #endif |
133 | 149 | ||
134 | /** |
150 | /** |
135 | * @} |
151 | * @} |
136 | */ |
152 | */ |
137 | 153 |