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1.1 root 1: /******************************************************************************
2: * fsif.h
3: *
4: * Interface to FS level split device drivers.
5: *
6: * Permission is hereby granted, free of charge, to any person obtaining a copy
7: * of this software and associated documentation files (the "Software"), to
8: * deal in the Software without restriction, including without limitation the
9: * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10: * sell copies of the Software, and to permit persons to whom the Software is
11: * furnished to do so, subject to the following conditions:
12: *
13: * The above copyright notice and this permission notice shall be included in
14: * all copies or substantial portions of the Software.
15: *
16: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17: * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19: * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20: * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21: * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22: * DEALINGS IN THE SOFTWARE.
23: *
24: * Copyright (c) 2007, Grzegorz Milos, <[email protected]>.
25: */
26:
27: #ifndef __XEN_PUBLIC_IO_FSIF_H__
28: #define __XEN_PUBLIC_IO_FSIF_H__
29:
30: #include "ring.h"
31: #include "../grant_table.h"
32:
33: #define REQ_FILE_OPEN 1
34: #define REQ_FILE_CLOSE 2
35: #define REQ_FILE_READ 3
36: #define REQ_FILE_WRITE 4
37: #define REQ_STAT 5
38: #define REQ_FILE_TRUNCATE 6
39: #define REQ_REMOVE 7
40: #define REQ_RENAME 8
41: #define REQ_CREATE 9
42: #define REQ_DIR_LIST 10
43: #define REQ_CHMOD 11
44: #define REQ_FS_SPACE 12
45: #define REQ_FILE_SYNC 13
46:
47: struct fsif_open_request {
48: grant_ref_t gref;
49: };
50:
51: struct fsif_close_request {
52: uint32_t fd;
53: };
54:
55: struct fsif_read_request {
56: uint32_t fd;
57: int32_t pad;
58: uint64_t len;
59: uint64_t offset;
60: grant_ref_t grefs[1]; /* Variable length */
61: };
62:
63: struct fsif_write_request {
64: uint32_t fd;
65: int32_t pad;
66: uint64_t len;
67: uint64_t offset;
68: grant_ref_t grefs[1]; /* Variable length */
69: };
70:
71: struct fsif_stat_request {
72: uint32_t fd;
73: };
74:
75: /* This structure is a copy of some fields from stat structure, returned
76: * via the ring. */
77: struct fsif_stat_response {
78: int32_t stat_mode;
79: uint32_t stat_uid;
80: uint32_t stat_gid;
81: int32_t stat_ret;
82: int64_t stat_size;
83: int64_t stat_atime;
84: int64_t stat_mtime;
85: int64_t stat_ctime;
86: };
87:
88: struct fsif_truncate_request {
89: uint32_t fd;
90: int32_t pad;
91: int64_t length;
92: };
93:
94: struct fsif_remove_request {
95: grant_ref_t gref;
96: };
97:
98: struct fsif_rename_request {
99: uint16_t old_name_offset;
100: uint16_t new_name_offset;
101: grant_ref_t gref;
102: };
103:
104: struct fsif_create_request {
105: int8_t directory;
106: int8_t pad;
107: int16_t pad2;
108: int32_t mode;
109: grant_ref_t gref;
110: };
111:
112: struct fsif_list_request {
113: uint32_t offset;
114: grant_ref_t gref;
115: };
116:
117: #define NR_FILES_SHIFT 0
118: #define NR_FILES_SIZE 16 /* 16 bits for the number of files mask */
119: #define NR_FILES_MASK (((1ULL << NR_FILES_SIZE) - 1) << NR_FILES_SHIFT)
120: #define ERROR_SIZE 32 /* 32 bits for the error mask */
121: #define ERROR_SHIFT (NR_FILES_SIZE + NR_FILES_SHIFT)
122: #define ERROR_MASK (((1ULL << ERROR_SIZE) - 1) << ERROR_SHIFT)
123: #define HAS_MORE_SHIFT (ERROR_SHIFT + ERROR_SIZE)
124: #define HAS_MORE_FLAG (1ULL << HAS_MORE_SHIFT)
125:
126: struct fsif_chmod_request {
127: uint32_t fd;
128: int32_t mode;
129: };
130:
131: struct fsif_space_request {
132: grant_ref_t gref;
133: };
134:
135: struct fsif_sync_request {
136: uint32_t fd;
137: };
138:
139:
140: /* FS operation request */
141: struct fsif_request {
142: uint8_t type; /* Type of the request */
143: uint8_t pad;
144: uint16_t id; /* Request ID, copied to the response */
145: uint32_t pad2;
146: union {
147: struct fsif_open_request fopen;
148: struct fsif_close_request fclose;
149: struct fsif_read_request fread;
150: struct fsif_write_request fwrite;
151: struct fsif_stat_request fstat;
152: struct fsif_truncate_request ftruncate;
153: struct fsif_remove_request fremove;
154: struct fsif_rename_request frename;
155: struct fsif_create_request fcreate;
156: struct fsif_list_request flist;
157: struct fsif_chmod_request fchmod;
158: struct fsif_space_request fspace;
159: struct fsif_sync_request fsync;
160: } u;
161: };
162: typedef struct fsif_request fsif_request_t;
163:
164: /* FS operation response */
165: struct fsif_response {
166: uint16_t id;
167: uint16_t pad1;
168: uint32_t pad2;
169: union {
170: uint64_t ret_val;
171: struct fsif_stat_response fstat;
172: };
173: };
174:
175: typedef struct fsif_response fsif_response_t;
176:
177: #define FSIF_RING_ENTRY_SIZE 64
178:
179: #define FSIF_NR_READ_GNTS ((FSIF_RING_ENTRY_SIZE - sizeof(struct fsif_read_request)) / \
180: sizeof(grant_ref_t) + 1)
181: #define FSIF_NR_WRITE_GNTS ((FSIF_RING_ENTRY_SIZE - sizeof(struct fsif_write_request)) / \
182: sizeof(grant_ref_t) + 1)
183:
184: DEFINE_RING_TYPES(fsif, struct fsif_request, struct fsif_response);
185:
186: #define STATE_INITIALISED "init"
187: #define STATE_READY "ready"
188:
189:
190:
191: #endif
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