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1 | /* |
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2 | * libeio API header |
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3 | * |
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4 | * Copyright (c) 2007,2008,2009 Marc Alexander Lehmann <libeio@schmorp.de> |
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5 | * All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without modifica- |
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8 | * tion, are permitted provided that the following conditions are met: |
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9 | * |
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10 | * 1. Redistributions of source code must retain the above copyright notice, |
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11 | * this list of conditions and the following disclaimer. |
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12 | * |
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13 | * 2. Redistributions in binary form must reproduce the above copyright |
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14 | * notice, this list of conditions and the following disclaimer in the |
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15 | * documentation and/or other materials provided with the distribution. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
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19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
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21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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22 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
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25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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26 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | * |
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28 | * Alternatively, the contents of this file may be used under the terms of |
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29 | * the GNU General Public License ("GPL") version 2 or any later version, |
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30 | * in which case the provisions of the GPL are applicable instead of |
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31 | * the above. If you wish to allow the use of your version of this file |
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32 | * only under the terms of the GPL and not to allow others to use your |
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33 | * version of this file under the BSD license, indicate your decision |
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34 | * by deleting the provisions above and replace them with the notice |
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35 | * and other provisions required by the GPL. If you do not delete the |
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36 | * provisions above, a recipient may use your version of this file under |
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37 | * either the BSD or the GPL. |
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38 | */ |
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39 | |
1 | #ifndef EIO_H_ |
40 | #ifndef EIO_H_ |
2 | #define EIO_H_ |
41 | #define EIO_H_ |
3 | |
42 | |
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43 | #ifdef __cplusplus |
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44 | extern "C" { |
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45 | #endif |
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46 | |
4 | #include <stddef.h> |
47 | #include <stddef.h> |
5 | #include <sys/types.h> |
48 | #include <sys/types.h> |
6 | |
49 | |
7 | typedef struct eio_req eio_req; |
50 | typedef struct eio_req eio_req; |
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51 | typedef struct eio_dirent eio_dirent; |
8 | |
52 | |
9 | typedef int (*eio_cb)(eio_req *req); |
53 | typedef int (*eio_cb)(eio_req *req); |
10 | |
54 | |
11 | #ifndef EIO_COMMON |
55 | #ifndef EIO_REQ_MEMBERS |
12 | # define EIO_COMMON void *data |
56 | # define EIO_REQ_MEMBERS |
13 | #endif |
57 | #endif |
14 | |
58 | |
15 | #ifndef EIO_STRUCT_STAT |
59 | #ifndef EIO_STRUCT_STAT |
16 | # define EIO_STRUCT_STAT struct stat |
60 | # define EIO_STRUCT_STAT struct stat |
17 | #endif |
61 | #endif |
18 | |
62 | |
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63 | /* for readdir */ |
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64 | |
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65 | /* eio_readdir flags */ |
19 | enum { |
66 | enum { |
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67 | EIO_READDIR_DENTS = 0x01, /* ptr2 contains eio_dirents, not just the (unsorted) names */ |
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68 | EIO_READDIR_DIRS_FIRST = 0x02, /* dirents gets sorted into a good stat() ing order to find directories first */ |
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69 | EIO_READDIR_STAT_ORDER = 0x04, /* dirents gets sorted into a good stat() ing order to quickly stat all files */ |
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70 | EIO_READDIR_FOUND_UNKNOWN = 0x80, /* set by eio_readdir when *_ARRAY was set and any TYPE=UNKNOWN's were found */ |
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71 | |
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72 | EIO_READDIR_CUSTOM1 = 0x100, /* for use by apps */ |
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73 | EIO_READDIR_CUSTOM2 = 0x200 /* for use by apps */ |
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74 | }; |
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75 | |
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76 | /* using "typical" values in the hope that the compiler will do something sensible */ |
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77 | enum eio_dtype { |
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78 | EIO_DT_UNKNOWN = 0, |
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79 | EIO_DT_FIFO = 1, |
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80 | EIO_DT_CHR = 2, |
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81 | EIO_DT_DIR = 4, |
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82 | EIO_DT_BLK = 6, |
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83 | EIO_DT_REG = 8, |
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84 | EIO_DT_LNK = 10, |
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85 | EIO_DT_SOCK = 12, |
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86 | EIO_DT_WHT = 14, |
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87 | EIO_DT_MAX = 15 /* highest DT_VALUE ever, hopefully */ |
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88 | }; |
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89 | |
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90 | struct eio_dirent { |
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91 | char *name; |
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92 | ino_t inode; |
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93 | unsigned short namelen; |
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94 | unsigned char type; |
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95 | unsigned char score; /* internal use */ |
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96 | /* 0-4 bytes padding */ |
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97 | }; |
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98 | |
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99 | /* eio_sync_file_range flags */ |
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100 | |
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101 | enum { |
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102 | EIO_SYNC_FILE_RANGE_WAIT_BEFORE = 1, |
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103 | EIO_SYNC_FILE_RANGE_WRITE = 2, |
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104 | EIO_SYNC_FILE_RANGE_WAIT_AFTER = 4 |
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105 | }; |
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106 | |
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107 | typedef double eio_tstamp; /* feel free to use double in your code directly */ |
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108 | |
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109 | /* the eio request structure */ |
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110 | |
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111 | enum { |
20 | EIO_QUIT, |
112 | EIO_CUSTOM, |
21 | EIO_OPEN, EIO_CLOSE, EIO_DUP2, |
113 | EIO_OPEN, EIO_CLOSE, EIO_DUP2, |
22 | EIO_READ, EIO_WRITE, |
114 | EIO_READ, EIO_WRITE, |
23 | EIO_READAHEAD, EIO_SENDFILE, |
115 | EIO_READAHEAD, EIO_SENDFILE, |
24 | EIO_STAT, EIO_LSTAT, EIO_FSTAT, |
116 | EIO_STAT, EIO_LSTAT, EIO_FSTAT, |
25 | EIO_TRUNCATE, EIO_FTRUNCATE, |
117 | EIO_TRUNCATE, EIO_FTRUNCATE, |
26 | EIO_UTIME, EIO_FUTIME, |
118 | EIO_UTIME, EIO_FUTIME, |
27 | EIO_CHMOD, EIO_FCHMOD, |
119 | EIO_CHMOD, EIO_FCHMOD, |
28 | EIO_CHOWN, EIO_FCHOWN, |
120 | EIO_CHOWN, EIO_FCHOWN, |
29 | EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC, |
121 | EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC, |
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122 | EIO_MSYNC, EIO_MTOUCH, EIO_SYNC_FILE_RANGE, |
30 | EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME, |
123 | EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME, |
31 | EIO_MKNOD, EIO_READDIR, |
124 | EIO_MKNOD, EIO_READDIR, |
32 | EIO_LINK, EIO_SYMLINK, EIO_READLINK, |
125 | EIO_LINK, EIO_SYMLINK, EIO_READLINK, |
33 | EIO_GROUP, EIO_NOP, |
126 | EIO_GROUP, EIO_NOP, |
34 | EIO_BUSY, |
127 | EIO_BUSY |
35 | }; |
128 | }; |
36 | |
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37 | typedef double eio_tstamp; /* feel free to use double in your code directly */ |
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38 | |
129 | |
39 | /* eio request structure */ |
130 | /* eio request structure */ |
40 | /* this structure is mostly read-only */ |
131 | /* this structure is mostly read-only */ |
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132 | /* when initialising it, all members must be zero-initialised */ |
41 | struct eio_req |
133 | struct eio_req |
42 | { |
134 | { |
43 | eio_req volatile *next; /* private */ |
135 | eio_req volatile *next; /* private ETP */ |
44 | |
136 | |
45 | ssize_t result; /* result of syscall, e.g. result = read (... */ |
137 | ssize_t result; /* result of syscall, e.g. result = read (... */ |
46 | off_t offs; /* read, write, truncate, readahead: file offset; mknod: dev_t */ |
138 | off_t offs; /* read, write, truncate, readahead, sync_file_range: file offset */ |
47 | size_t size; /* read, write, readahead, sendfile: length */ |
139 | size_t size; /* read, write, readahead, sendfile, msync, sync_file_range: length */ |
48 | void *ptr1; /* all applicable requests: pathname, old name */ |
140 | void *ptr1; /* all applicable requests: pathname, old name */ |
49 | void *ptr2; /* all applicable requests: new name or memory buffer */ |
141 | void *ptr2; /* all applicable requests: new name or memory buffer */ |
50 | eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */ |
142 | eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */ |
51 | eio_tstamp nv2; /* utime, futime: mtime */ |
143 | eio_tstamp nv2; /* utime, futime: mtime */ |
52 | |
144 | |
53 | int type; /* EIO_xxx constant */ |
145 | int type; /* EIO_xxx constant ETP */ |
54 | int int1; /* all applicable requests: file descriptor; sendfile: output fd; open: flags */ |
146 | int int1; /* all applicable requests: file descriptor; sendfile: output fd; open, msync, readdir: flags */ |
55 | long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode */ |
147 | long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode, sync_file_range: flags */ |
56 | long int3; /* chown, fchown: gid */ |
148 | long int3; /* chown, fchown: gid; mknod: dev_t */ |
57 | int errorno; /* errno value on syscall return */ |
149 | int errorno; /* errno value on syscall return */ |
58 | |
150 | |
59 | unsigned char flags; /* private */ |
151 | unsigned char flags; /* private */ |
60 | unsigned char pri; /* the priority */ |
152 | signed char pri; /* the priority */ |
61 | |
153 | |
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154 | void *data; |
62 | eio_cb finish; |
155 | eio_cb finish; |
63 | void (*destroy)(eio_req *req); |
156 | void (*destroy)(eio_req *req); /* called when requets no longer needed */ |
64 | void (*feed)(eio_req *req); |
157 | void (*feed)(eio_req *req); /* only used for group requests */ |
65 | |
158 | |
66 | EIO_COMMON; |
159 | EIO_REQ_MEMBERS |
67 | |
160 | |
68 | eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */ |
161 | eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */ |
69 | }; |
162 | }; |
70 | |
163 | |
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164 | /* _private_ flags */ |
71 | enum { |
165 | enum { |
72 | EIO_FLAG_CANCELLED = 0x01, /* request was cancelled */ |
166 | EIO_FLAG_CANCELLED = 0x01, /* request was cancelled */ |
73 | EIO_FLAG_PTR1_FREE = 0x02, /* need to free(ptr1) */ |
167 | EIO_FLAG_PTR1_FREE = 0x02, /* need to free(ptr1) */ |
74 | EIO_FLAG_PTR2_FREE = 0x04 /* need to free(ptr2) */ |
168 | EIO_FLAG_PTR2_FREE = 0x04, /* need to free(ptr2) */ |
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169 | EIO_FLAG_GROUPADD = 0x08 /* some request was added to the group */ |
75 | }; |
170 | }; |
76 | |
171 | |
77 | enum { |
172 | enum { |
78 | EIO_PRI_MIN = -4, |
173 | EIO_PRI_MIN = -4, |
79 | EIO_PRI_MAX = 4, |
174 | EIO_PRI_MAX = 4, |
80 | |
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81 | EIO_PRI_DEFAULT = 0, |
175 | EIO_PRI_DEFAULT = 0, |
82 | EIO_PRI_BIAS = -EIO_PRI_MIN, |
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83 | EIO_NUM_PRI = EIO_PRI_MAX + EIO_PRI_BIAS + 1 |
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84 | }; |
176 | }; |
85 | |
177 | |
86 | /* returns < 0 on error, errno set |
178 | /* returns < 0 on error, errno set |
87 | * need_poll, if non-zero, will be called when results are available |
179 | * need_poll, if non-zero, will be called when results are available |
88 | * and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself). |
180 | * and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself). |
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110 | unsigned int eio_nready (void); /* number of not-yet handled requests */ |
202 | unsigned int eio_nready (void); /* number of not-yet handled requests */ |
111 | unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */ |
203 | unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */ |
112 | unsigned int eio_nthreads (void); /* number of worker threads in use currently */ |
204 | unsigned int eio_nthreads (void); /* number of worker threads in use currently */ |
113 | |
205 | |
114 | /*****************************************************************************/ |
206 | /*****************************************************************************/ |
115 | /* high-level request API */ |
207 | /* convinience wrappers */ |
116 | |
208 | |
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209 | #ifndef EIO_NO_WRAPPERS |
117 | eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */ |
210 | eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */ |
118 | eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */ |
211 | eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */ |
119 | eio_req *eio_sync (int pri, eio_cb cb, void *data); |
212 | eio_req *eio_sync (int pri, eio_cb cb, void *data); |
120 | eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data); |
213 | eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data); |
121 | eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data); |
214 | eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data); |
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215 | eio_req *eio_msync (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data); |
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216 | eio_req *eio_mtouch (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data); |
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217 | eio_req *eio_sync_file_range (int fd, off_t offset, size_t nbytes, unsigned int flags, int pri, eio_cb cb, void *data); |
122 | eio_req *eio_close (int fd, int pri, eio_cb cb, void *data); |
218 | eio_req *eio_close (int fd, int pri, eio_cb cb, void *data); |
123 | eio_req *eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void *data); |
219 | eio_req *eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void *data); |
124 | eio_req *eio_read (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); |
220 | eio_req *eio_read (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); |
125 | eio_req *eio_write (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); |
221 | eio_req *eio_write (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); |
126 | eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
222 | eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
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134 | eio_req *eio_utime (const char *path, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data); |
230 | eio_req *eio_utime (const char *path, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data); |
135 | eio_req *eio_truncate (const char *path, off_t offset, int pri, eio_cb cb, void *data); |
231 | eio_req *eio_truncate (const char *path, off_t offset, int pri, eio_cb cb, void *data); |
136 | eio_req *eio_chown (const char *path, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data); |
232 | eio_req *eio_chown (const char *path, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data); |
137 | eio_req *eio_chmod (const char *path, mode_t mode, int pri, eio_cb cb, void *data); |
233 | eio_req *eio_chmod (const char *path, mode_t mode, int pri, eio_cb cb, void *data); |
138 | eio_req *eio_mkdir (const char *path, mode_t mode, int pri, eio_cb cb, void *data); |
234 | eio_req *eio_mkdir (const char *path, mode_t mode, int pri, eio_cb cb, void *data); |
139 | eio_req *eio_readdir (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */ |
235 | eio_req *eio_readdir (const char *path, int flags, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */ |
140 | eio_req *eio_rmdir (const char *path, int pri, eio_cb cb, void *data); |
236 | eio_req *eio_rmdir (const char *path, int pri, eio_cb cb, void *data); |
141 | eio_req *eio_unlink (const char *path, int pri, eio_cb cb, void *data); |
237 | eio_req *eio_unlink (const char *path, int pri, eio_cb cb, void *data); |
142 | eio_req *eio_readlink (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */ |
238 | eio_req *eio_readlink (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */ |
143 | eio_req *eio_stat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
239 | eio_req *eio_stat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
144 | eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
240 | eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
145 | eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data); |
241 | eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data); |
146 | eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
242 | eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
147 | eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
243 | eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
148 | eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
244 | eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
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245 | eio_req *eio_custom (eio_cb execute, int pri, eio_cb cb, void *data); |
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246 | #endif |
149 | |
247 | |
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248 | /*****************************************************************************/ |
150 | /* for groups */ |
249 | /* groups */ |
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250 | |
151 | eio_req *eio_grp (eio_cb cb, void *data); |
251 | eio_req *eio_grp (eio_cb cb, void *data); |
152 | void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit); |
252 | void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit); |
153 | void eio_grp_limit (eio_req *grp, int limit); |
253 | void eio_grp_limit (eio_req *grp, int limit); |
154 | void eio_grp_add (eio_req *grp, eio_req *req); |
254 | void eio_grp_add (eio_req *grp, eio_req *req); |
155 | void eio_grp_cancel (eio_req *grp); /* cancels all sub requests but not the group */ |
255 | void eio_grp_cancel (eio_req *grp); /* cancels all sub requests but not the group */ |
156 | |
256 | |
157 | /* cancel a request as soon fast as possible */ |
257 | /*****************************************************************************/ |
158 | void eio_cancel (eio_req *req); |
258 | /* request api */ |
159 | /* destroy a request that has never been submitted */ |
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160 | void eio_destroy (eio_req *req); |
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161 | |
259 | |
162 | /* true if the request was cancelled, useful in the invoke callback */ |
260 | /* true if the request was cancelled, useful in the invoke callback */ |
163 | #define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED) |
261 | #define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED) |
164 | |
262 | |
165 | #define EIO_RESULT(req) ((req)->result) |
263 | #define EIO_RESULT(req) ((req)->result) |
166 | /* returns a pointer to the result buffer allocated by eio */ |
264 | /* returns a pointer to the result buffer allocated by eio */ |
167 | #define EIO_BUF(req) ((req)->ptr2) |
265 | #define EIO_BUF(req) ((req)->ptr2) |
168 | #define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req)) |
266 | #define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req)) |
169 | #define EIO_PATH(req) ((char *)(req)->ptr1) |
267 | #define EIO_PATH(req) ((char *)(req)->ptr1) |
170 | |
268 | |
171 | /*****************************************************************************/ |
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172 | /* low-level request API */ |
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173 | |
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174 | /* must be used to initialise eio_req's */ |
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175 | #define EIO_INIT(req,prio,finish_cb, destroy_cb) \ |
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176 | memset ((req), 0, sizeof (eio_req)); \ |
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177 | (req)->pri = (prio) + EIO_PRI_BIAS; \ |
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178 | (req)->finish = (finish_cb); \ |
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179 | (req)->destroy = (destroy_cb) |
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180 | |
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181 | /* submit a request for execution */ |
269 | /* submit a request for execution */ |
182 | void eio_submit (eio_req *req); |
270 | void eio_submit (eio_req *req); |
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271 | /* cancel a request as soon fast as possible, if possible */ |
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272 | void eio_cancel (eio_req *req); |
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273 | /* destroy a request that has never been submitted */ |
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274 | void eio_destroy (eio_req *req); |
183 | |
275 | |
184 | /*****************************************************************************/ |
276 | /*****************************************************************************/ |
185 | /* convinience functions */ |
277 | /* convinience functions */ |
186 | |
278 | |
187 | ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count); |
279 | ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count); |
188 | |
280 | |
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281 | #ifdef __cplusplus |
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282 | } |
189 | #endif |
283 | #endif |
190 | |
284 | |
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285 | #endif |
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286 | |