| 1 |
/* |
| 2 |
* libeio API header |
| 3 |
* |
| 4 |
* Copyright (c) 2007,2008 Marc Alexander Lehmann <libeio@schmorp.de> |
| 5 |
* All rights reserved. |
| 6 |
* |
| 7 |
* Redistribution and use in source and binary forms, with or without modifica- |
| 8 |
* tion, are permitted provided that the following conditions are met: |
| 9 |
* |
| 10 |
* 1. Redistributions of source code must retain the above copyright notice, |
| 11 |
* this list of conditions and the following disclaimer. |
| 12 |
* |
| 13 |
* 2. Redistributions in binary form must reproduce the above copyright |
| 14 |
* notice, this list of conditions and the following disclaimer in the |
| 15 |
* documentation and/or other materials provided with the distribution. |
| 16 |
* |
| 17 |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 18 |
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
| 19 |
* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
| 20 |
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
| 21 |
* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 22 |
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 23 |
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 24 |
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
| 25 |
* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 26 |
* OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 |
* |
| 28 |
* Alternatively, the contents of this file may be used under the terms of |
| 29 |
* the GNU General Public License ("GPL") version 2 or any later version, |
| 30 |
* in which case the provisions of the GPL are applicable instead of |
| 31 |
* the above. If you wish to allow the use of your version of this file |
| 32 |
* only under the terms of the GPL and not to allow others to use your |
| 33 |
* version of this file under the BSD license, indicate your decision |
| 34 |
* by deleting the provisions above and replace them with the notice |
| 35 |
* and other provisions required by the GPL. If you do not delete the |
| 36 |
* provisions above, a recipient may use your version of this file under |
| 37 |
* either the BSD or the GPL. |
| 38 |
*/ |
| 39 |
|
| 40 |
#ifndef EIO_H_ |
| 41 |
#define EIO_H_ |
| 42 |
|
| 43 |
#ifdef __cplusplus |
| 44 |
extern "C" { |
| 45 |
#endif |
| 46 |
|
| 47 |
#include <stddef.h> |
| 48 |
#include <sys/types.h> |
| 49 |
|
| 50 |
typedef struct eio_req eio_req; |
| 51 |
|
| 52 |
typedef int (*eio_cb)(eio_req *req); |
| 53 |
|
| 54 |
#ifndef EIO_REQ_MEMBERS |
| 55 |
# define EIO_REQ_MEMBERS |
| 56 |
#endif |
| 57 |
|
| 58 |
#ifndef EIO_STRUCT_STAT |
| 59 |
# define EIO_STRUCT_STAT struct stat |
| 60 |
#endif |
| 61 |
|
| 62 |
enum { |
| 63 |
EIO_CUSTOM, |
| 64 |
EIO_OPEN, EIO_CLOSE, EIO_DUP2, |
| 65 |
EIO_READ, EIO_WRITE, |
| 66 |
EIO_READAHEAD, EIO_SENDFILE, |
| 67 |
EIO_STAT, EIO_LSTAT, EIO_FSTAT, |
| 68 |
EIO_TRUNCATE, EIO_FTRUNCATE, |
| 69 |
EIO_UTIME, EIO_FUTIME, |
| 70 |
EIO_CHMOD, EIO_FCHMOD, |
| 71 |
EIO_CHOWN, EIO_FCHOWN, |
| 72 |
EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC, |
| 73 |
EIO_MSYNC, EIO_MTOUCH, EIO_SYNC_FILE_RANGE, |
| 74 |
EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME, |
| 75 |
EIO_MKNOD, EIO_READDIR, |
| 76 |
EIO_LINK, EIO_SYMLINK, EIO_READLINK, |
| 77 |
EIO_GROUP, EIO_NOP, |
| 78 |
EIO_BUSY |
| 79 |
}; |
| 80 |
|
| 81 |
/* eio_sync_file_range flags */ |
| 82 |
|
| 83 |
enum { |
| 84 |
EIO_SYNC_FILE_RANGE_WAIT_BEFORE = 1, |
| 85 |
EIO_SYNC_FILE_RANGE_WRITE = 2, |
| 86 |
EIO_SYNC_FILE_RANGE_WAIT_AFTER = 4 |
| 87 |
}; |
| 88 |
|
| 89 |
typedef double eio_tstamp; /* feel free to use double in your code directly */ |
| 90 |
|
| 91 |
/* eio request structure */ |
| 92 |
/* this structure is mostly read-only */ |
| 93 |
struct eio_req |
| 94 |
{ |
| 95 |
eio_req volatile *next; /* private ETP */ |
| 96 |
|
| 97 |
ssize_t result; /* result of syscall, e.g. result = read (... */ |
| 98 |
off_t offs; /* read, write, truncate, readahead, sync_file_range: file offset */ |
| 99 |
size_t size; /* read, write, readahead, sendfile, msync, sync_file_range: length */ |
| 100 |
void *ptr1; /* all applicable requests: pathname, old name */ |
| 101 |
void *ptr2; /* all applicable requests: new name or memory buffer */ |
| 102 |
eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */ |
| 103 |
eio_tstamp nv2; /* utime, futime: mtime */ |
| 104 |
|
| 105 |
int type; /* EIO_xxx constant ETP */ |
| 106 |
int int1; /* all applicable requests: file descriptor; sendfile: output fd; open, msync: flags */ |
| 107 |
long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode, sync_file_range: flags */ |
| 108 |
long int3; /* chown, fchown: gid; mknod: dev_t */ |
| 109 |
int errorno; /* errno value on syscall return */ |
| 110 |
|
| 111 |
unsigned char flags; /* private */ |
| 112 |
signed char pri; /* the priority */ |
| 113 |
|
| 114 |
void *data; |
| 115 |
eio_cb finish; |
| 116 |
void (*destroy)(eio_req *req); /* called when requets no longer needed */ |
| 117 |
void (*feed)(eio_req *req); /* only used for group requests */ |
| 118 |
|
| 119 |
EIO_REQ_MEMBERS |
| 120 |
|
| 121 |
eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */ |
| 122 |
}; |
| 123 |
|
| 124 |
/* _private_ flags */ |
| 125 |
enum { |
| 126 |
EIO_FLAG_CANCELLED = 0x01, /* request was cancelled */ |
| 127 |
EIO_FLAG_PTR1_FREE = 0x02, /* need to free(ptr1) */ |
| 128 |
EIO_FLAG_PTR2_FREE = 0x04, /* need to free(ptr2) */ |
| 129 |
EIO_FLAG_GROUPADD = 0x08 /* some request was added to the group */ |
| 130 |
}; |
| 131 |
|
| 132 |
enum { |
| 133 |
EIO_PRI_MIN = -4, |
| 134 |
EIO_PRI_MAX = 4, |
| 135 |
EIO_PRI_DEFAULT = 0, |
| 136 |
}; |
| 137 |
|
| 138 |
/* returns < 0 on error, errno set |
| 139 |
* need_poll, if non-zero, will be called when results are available |
| 140 |
* and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself). |
| 141 |
* done_poll is called when the need to poll is gone. |
| 142 |
*/ |
| 143 |
int eio_init (void (*want_poll)(void), void (*done_poll)(void)); |
| 144 |
|
| 145 |
/* must be called regularly to handle pending requests */ |
| 146 |
/* returns 0 if all requests were handled, -1 if not, or the value of EIO_FINISH if != 0 */ |
| 147 |
int eio_poll (void); |
| 148 |
|
| 149 |
/* stop polling if poll took longer than duration seconds */ |
| 150 |
void eio_set_max_poll_time (eio_tstamp nseconds); |
| 151 |
/* do not handle more then count requests in one call to eio_poll_cb */ |
| 152 |
void eio_set_max_poll_reqs (unsigned int nreqs); |
| 153 |
|
| 154 |
/* set minimum required number |
| 155 |
* maximum wanted number |
| 156 |
* or maximum idle number of threads */ |
| 157 |
void eio_set_min_parallel (unsigned int nthreads); |
| 158 |
void eio_set_max_parallel (unsigned int nthreads); |
| 159 |
void eio_set_max_idle (unsigned int nthreads); |
| 160 |
|
| 161 |
unsigned int eio_nreqs (void); /* number of requests in-flight */ |
| 162 |
unsigned int eio_nready (void); /* number of not-yet handled requests */ |
| 163 |
unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */ |
| 164 |
unsigned int eio_nthreads (void); /* number of worker threads in use currently */ |
| 165 |
|
| 166 |
/*****************************************************************************/ |
| 167 |
/* convinience wrappers */ |
| 168 |
|
| 169 |
#ifndef EIO_NO_WRAPPERS |
| 170 |
eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */ |
| 171 |
eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */ |
| 172 |
eio_req *eio_sync (int pri, eio_cb cb, void *data); |
| 173 |
eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data); |
| 174 |
eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data); |
| 175 |
eio_req *eio_msync (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data); |
| 176 |
eio_req *eio_mtouch (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data); |
| 177 |
eio_req *eio_sync_file_range (int fd, off_t offset, size_t nbytes, unsigned int flags, int pri, eio_cb cb, void *data); |
| 178 |
eio_req *eio_close (int fd, int pri, eio_cb cb, void *data); |
| 179 |
eio_req *eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void *data); |
| 180 |
eio_req *eio_read (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); |
| 181 |
eio_req *eio_write (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); |
| 182 |
eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
| 183 |
eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data); |
| 184 |
eio_req *eio_ftruncate (int fd, off_t offset, int pri, eio_cb cb, void *data); |
| 185 |
eio_req *eio_fchmod (int fd, mode_t mode, int pri, eio_cb cb, void *data); |
| 186 |
eio_req *eio_fchown (int fd, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data); |
| 187 |
eio_req *eio_dup2 (int fd, int fd2, int pri, eio_cb cb, void *data); |
| 188 |
eio_req *eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, int pri, eio_cb cb, void *data); |
| 189 |
eio_req *eio_open (const char *path, int flags, mode_t mode, int pri, eio_cb cb, void *data); |
| 190 |
eio_req *eio_utime (const char *path, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data); |
| 191 |
eio_req *eio_truncate (const char *path, off_t offset, int pri, eio_cb cb, void *data); |
| 192 |
eio_req *eio_chown (const char *path, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data); |
| 193 |
eio_req *eio_chmod (const char *path, mode_t mode, int pri, eio_cb cb, void *data); |
| 194 |
eio_req *eio_mkdir (const char *path, mode_t mode, int pri, eio_cb cb, void *data); |
| 195 |
eio_req *eio_readdir (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */ |
| 196 |
eio_req *eio_rmdir (const char *path, int pri, eio_cb cb, void *data); |
| 197 |
eio_req *eio_unlink (const char *path, int pri, eio_cb cb, void *data); |
| 198 |
eio_req *eio_readlink (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */ |
| 199 |
eio_req *eio_stat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
| 200 |
eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
| 201 |
eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data); |
| 202 |
eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
| 203 |
eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
| 204 |
eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
| 205 |
eio_req *eio_custom (eio_cb execute, int pri, eio_cb cb, void *data); |
| 206 |
#endif |
| 207 |
|
| 208 |
/*****************************************************************************/ |
| 209 |
/* groups */ |
| 210 |
|
| 211 |
eio_req *eio_grp (eio_cb cb, void *data); |
| 212 |
void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit); |
| 213 |
void eio_grp_limit (eio_req *grp, int limit); |
| 214 |
void eio_grp_add (eio_req *grp, eio_req *req); |
| 215 |
void eio_grp_cancel (eio_req *grp); /* cancels all sub requests but not the group */ |
| 216 |
|
| 217 |
/*****************************************************************************/ |
| 218 |
/* request api */ |
| 219 |
|
| 220 |
/* true if the request was cancelled, useful in the invoke callback */ |
| 221 |
#define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED) |
| 222 |
|
| 223 |
#define EIO_RESULT(req) ((req)->result) |
| 224 |
/* returns a pointer to the result buffer allocated by eio */ |
| 225 |
#define EIO_BUF(req) ((req)->ptr2) |
| 226 |
#define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req)) |
| 227 |
#define EIO_PATH(req) ((char *)(req)->ptr1) |
| 228 |
|
| 229 |
/* submit a request for execution */ |
| 230 |
void eio_submit (eio_req *req); |
| 231 |
/* cancel a request as soon fast as possible, if possible */ |
| 232 |
void eio_cancel (eio_req *req); |
| 233 |
/* destroy a request that has never been submitted */ |
| 234 |
void eio_destroy (eio_req *req); |
| 235 |
|
| 236 |
/*****************************************************************************/ |
| 237 |
/* convinience functions */ |
| 238 |
|
| 239 |
ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count); |
| 240 |
|
| 241 |
#ifdef __cplusplus |
| 242 |
} |
| 243 |
#endif |
| 244 |
|
| 245 |
#endif |
| 246 |
|
