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376 lines
15 KiB
376 lines
15 KiB
/*
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* libeio API header
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*
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* Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libeio@schmorp.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modifica-
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* tion, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
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* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
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* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
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* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Alternatively, the contents of this file may be used under the terms of
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* the GNU General Public License ("GPL") version 2 or any later version,
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* in which case the provisions of the GPL are applicable instead of
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* the above. If you wish to allow the use of your version of this file
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* only under the terms of the GPL and not to allow others to use your
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* version of this file under the BSD license, indicate your decision
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* by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL. If you do not delete the
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* provisions above, a recipient may use your version of this file under
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* either the BSD or the GPL.
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*/
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#ifndef EIO_H_
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#define EIO_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stddef.h>
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#include <signal.h>
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#include <sys/types.h>
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typedef struct eio_req eio_req;
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typedef struct eio_dirent eio_dirent;
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typedef int (*eio_cb)(eio_req *req);
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#ifndef EIO_REQ_MEMBERS
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# define EIO_REQ_MEMBERS
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#endif
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#ifndef EIO_STRUCT_STAT
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# ifdef _WIN32
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# define EIO_STRUCT_STAT struct _stati64
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# define EIO_STRUCT_STATI64
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# else
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# define EIO_STRUCT_STAT struct stat
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# endif
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#endif
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#ifdef _WIN32
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typedef int eio_uid_t;
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typedef int eio_gid_t;
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typedef int eio_mode_t;
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#ifdef __MINGW32__ /* no intptr_t */
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typedef ssize_t eio_ssize_t;
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#else
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typedef intptr_t eio_ssize_t; /* or SSIZE_T */
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#endif
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#if __GNUC__
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typedef long long eio_ino_t;
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#else
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typedef __int64 eio_ino_t; /* unsigned not supported by msvc */
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#endif
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#else
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typedef uid_t eio_uid_t;
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typedef gid_t eio_gid_t;
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typedef ssize_t eio_ssize_t;
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typedef ino_t eio_ino_t;
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typedef mode_t eio_mode_t;
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#endif
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#ifndef EIO_STRUCT_STATVFS
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# define EIO_STRUCT_STATVFS struct statvfs
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#endif
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/* for readdir */
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/* eio_readdir flags */
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enum
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{
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EIO_READDIR_DENTS = 0x01, /* ptr2 contains eio_dirents, not just the (unsorted) names */
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EIO_READDIR_DIRS_FIRST = 0x02, /* dirents gets sorted into a good stat() ing order to find directories first */
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EIO_READDIR_STAT_ORDER = 0x04, /* dirents gets sorted into a good stat() ing order to quickly stat all files */
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EIO_READDIR_FOUND_UNKNOWN = 0x80, /* set by eio_readdir when *_ARRAY was set and any TYPE=UNKNOWN's were found */
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EIO_READDIR_CUSTOM1 = 0x100, /* for use by apps */
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EIO_READDIR_CUSTOM2 = 0x200 /* for use by apps */
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};
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/* using "typical" values in the hope that the compiler will do something sensible */
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enum eio_dtype
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{
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EIO_DT_UNKNOWN = 0,
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EIO_DT_FIFO = 1,
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EIO_DT_CHR = 2,
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EIO_DT_MPC = 3, /* multiplexed char device (v7+coherent) */
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EIO_DT_DIR = 4,
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EIO_DT_NAM = 5, /* xenix special named file */
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EIO_DT_BLK = 6,
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EIO_DT_MPB = 7, /* multiplexed block device (v7+coherent) */
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EIO_DT_REG = 8,
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EIO_DT_NWK = 9, /* HP-UX network special */
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EIO_DT_CMP = 9, /* VxFS compressed */
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EIO_DT_LNK = 10,
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/* DT_SHAD = 11,*/
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EIO_DT_SOCK = 12,
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EIO_DT_DOOR = 13, /* solaris door */
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EIO_DT_WHT = 14,
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EIO_DT_MAX = 15 /* highest DT_VALUE ever, hopefully */
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};
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struct eio_dirent
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{
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int nameofs; /* offset of null-terminated name string in (char *)req->ptr2 */
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unsigned short namelen; /* size of filename without trailing 0 */
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unsigned char type; /* one of EIO_DT_* */
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signed char score; /* internal use */
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eio_ino_t inode; /* the inode number, if available, otherwise unspecified */
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};
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/* eio_msync flags */
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enum
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{
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EIO_MS_ASYNC = 1,
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EIO_MS_INVALIDATE = 2,
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EIO_MS_SYNC = 4
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};
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/* eio_mtouch flags */
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enum
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{
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EIO_MT_MODIFY = 1
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};
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/* eio_sync_file_range flags */
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enum
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{
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EIO_SYNC_FILE_RANGE_WAIT_BEFORE = 1,
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EIO_SYNC_FILE_RANGE_WRITE = 2,
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EIO_SYNC_FILE_RANGE_WAIT_AFTER = 4
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};
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/* eio_fallocate flags */
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enum
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{
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EIO_FALLOC_FL_KEEP_SIZE = 1 /* MUST match the value in linux/falloc.h */
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};
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/* timestamps and differences - feel free to use double in your code directly */
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typedef double eio_tstamp;
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/* the eio request structure */
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enum
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{
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EIO_CUSTOM,
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EIO_OPEN, EIO_CLOSE, EIO_DUP2,
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EIO_READ, EIO_WRITE,
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EIO_READAHEAD, EIO_SENDFILE,
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EIO_STAT, EIO_LSTAT, EIO_FSTAT,
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EIO_STATVFS, EIO_FSTATVFS,
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EIO_TRUNCATE, EIO_FTRUNCATE,
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EIO_UTIME, EIO_FUTIME,
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EIO_CHMOD, EIO_FCHMOD,
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EIO_CHOWN, EIO_FCHOWN,
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EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC, EIO_SYNCFS,
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EIO_MSYNC, EIO_MTOUCH, EIO_SYNC_FILE_RANGE, EIO_FALLOCATE,
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EIO_MLOCK, EIO_MLOCKALL,
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EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME,
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EIO_MKNOD, EIO_READDIR,
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EIO_LINK, EIO_SYMLINK, EIO_READLINK, EIO_REALPATH,
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EIO_GROUP, EIO_NOP,
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EIO_BUSY
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};
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/* mlockall constants */
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enum
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{
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EIO_MCL_CURRENT = 1,
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EIO_MCL_FUTURE = 2
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};
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/* request priorities */
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enum {
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EIO_PRI_MIN = -4,
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EIO_PRI_MAX = 4,
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EIO_PRI_DEFAULT = 0
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};
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/* eio request structure */
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/* this structure is mostly read-only */
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/* when initialising it, all members must be zero-initialised */
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struct eio_req
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{
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eio_req volatile *next; /* private ETP */
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eio_ssize_t result; /* result of syscall, e.g. result = read (... */
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off_t offs; /* read, write, truncate, readahead, sync_file_range, fallocate: file offset, mknod: dev_t */
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size_t size; /* read, write, readahead, sendfile, msync, mlock, sync_file_range, fallocate: length */
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void *ptr1; /* all applicable requests: pathname, old name; readdir: optional eio_dirents */
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void *ptr2; /* all applicable requests: new name or memory buffer; readdir: name strings */
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eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */
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eio_tstamp nv2; /* utime, futime: mtime */
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int type; /* EIO_xxx constant ETP */
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int int1; /* all applicable requests: file descriptor; sendfile: output fd; open, msync, mlockall, readdir: flags */
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long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode, sync_file_range, fallocate: flags */
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long int3; /* chown, fchown: gid */
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int errorno; /* errno value on syscall return */
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#if __i386 || __amd64
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unsigned char cancelled;
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#else
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sig_atomic_t cancelled;
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#endif
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unsigned char flags; /* private */
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signed char pri; /* the priority */
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void *data;
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eio_cb finish;
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void (*destroy)(eio_req *req); /* called when request no longer needed */
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void (*feed)(eio_req *req); /* only used for group requests */
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EIO_REQ_MEMBERS
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eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */
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};
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/* _private_ request flags */
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enum {
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EIO_FLAG_PTR1_FREE = 0x01, /* need to free(ptr1) */
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EIO_FLAG_PTR2_FREE = 0x02, /* need to free(ptr2) */
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EIO_FLAG_GROUPADD = 0x04 /* some request was added to the group */
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};
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/* undocumented/unsupported/private helper */
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/*void eio_page_align (void **addr, size_t *length);*/
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/* returns < 0 on error, errno set
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* need_poll, if non-zero, will be called when results are available
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* and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself).
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* done_poll is called when the need to poll is gone.
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*/
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int eio_init (void (*want_poll)(void), void (*done_poll)(void));
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/* must be called regularly to handle pending requests */
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/* returns 0 if all requests were handled, -1 if not, or the value of EIO_FINISH if != 0 */
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int eio_poll (void);
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/* stop polling if poll took longer than duration seconds */
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void eio_set_max_poll_time (eio_tstamp nseconds);
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/* do not handle more then count requests in one call to eio_poll_cb */
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void eio_set_max_poll_reqs (unsigned int nreqs);
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/* set minimum required number
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* maximum wanted number
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* or maximum idle number of threads */
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void eio_set_min_parallel (unsigned int nthreads);
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void eio_set_max_parallel (unsigned int nthreads);
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void eio_set_max_idle (unsigned int nthreads);
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void eio_set_idle_timeout (unsigned int seconds);
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unsigned int eio_nreqs (void); /* number of requests in-flight */
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unsigned int eio_nready (void); /* number of not-yet handled requests */
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unsigned int eio_npending (void); /* number of finished but unhandled requests */
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unsigned int eio_nthreads (void); /* number of worker threads in use currently */
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/*****************************************************************************/
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/* convenience wrappers */
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#ifndef EIO_NO_WRAPPERS
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eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */
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eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */
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eio_req *eio_sync (int pri, eio_cb cb, void *data);
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eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data);
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eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data);
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eio_req *eio_syncfs (int fd, int pri, eio_cb cb, void *data);
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eio_req *eio_msync (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data);
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eio_req *eio_mtouch (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data);
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eio_req *eio_mlock (void *addr, size_t length, int pri, eio_cb cb, void *data);
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eio_req *eio_mlockall (int flags, int pri, eio_cb cb, void *data);
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eio_req *eio_sync_file_range (int fd, off_t offset, size_t nbytes, unsigned int flags, int pri, eio_cb cb, void *data);
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eio_req *eio_fallocate (int fd, int mode, off_t offset, size_t len, int pri, eio_cb cb, void *data);
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eio_req *eio_close (int fd, int pri, eio_cb cb, void *data);
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eio_req *eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void *data);
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eio_req *eio_read (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data);
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eio_req *eio_write (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data);
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eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
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eio_req *eio_fstatvfs (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
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eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data);
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eio_req *eio_ftruncate (int fd, off_t offset, int pri, eio_cb cb, void *data);
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eio_req *eio_fchmod (int fd, eio_mode_t mode, int pri, eio_cb cb, void *data);
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eio_req *eio_fchown (int fd, eio_uid_t uid, eio_gid_t gid, int pri, eio_cb cb, void *data);
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eio_req *eio_dup2 (int fd, int fd2, int pri, eio_cb cb, void *data);
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eio_req *eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, int pri, eio_cb cb, void *data);
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eio_req *eio_open (const char *path, int flags, eio_mode_t mode, int pri, eio_cb cb, void *data);
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eio_req *eio_utime (const char *path, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data);
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eio_req *eio_truncate (const char *path, off_t offset, int pri, eio_cb cb, void *data);
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eio_req *eio_chown (const char *path, eio_uid_t uid, eio_gid_t gid, int pri, eio_cb cb, void *data);
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eio_req *eio_chmod (const char *path, eio_mode_t mode, int pri, eio_cb cb, void *data);
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eio_req *eio_mkdir (const char *path, eio_mode_t mode, int pri, eio_cb cb, void *data);
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eio_req *eio_readdir (const char *path, int flags, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */
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eio_req *eio_rmdir (const char *path, int pri, eio_cb cb, void *data);
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eio_req *eio_unlink (const char *path, int pri, eio_cb cb, void *data);
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eio_req *eio_readlink (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */
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eio_req *eio_realpath (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */
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eio_req *eio_stat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
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eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
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eio_req *eio_statvfs (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
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eio_req *eio_mknod (const char *path, eio_mode_t mode, dev_t dev, int pri, eio_cb cb, void *data);
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eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
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eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
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eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
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eio_req *eio_custom (void (*execute)(eio_req *), int pri, eio_cb cb, void *data);
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#endif
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/*****************************************************************************/
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/* groups */
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eio_req *eio_grp (eio_cb cb, void *data);
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void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit);
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void eio_grp_limit (eio_req *grp, int limit);
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void eio_grp_add (eio_req *grp, eio_req *req);
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void eio_grp_cancel (eio_req *grp); /* cancels all sub requests but not the group */
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/*****************************************************************************/
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/* request api */
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/* true if the request was cancelled, useful in the invoke callback */
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#define EIO_CANCELLED(req) ((req)->cancelled)
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#define EIO_RESULT(req) ((req)->result)
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/* returns a pointer to the result buffer allocated by eio */
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#define EIO_BUF(req) ((req)->ptr2)
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#define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req))
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#define EIO_STATVFS_BUF(req) ((EIO_STRUCT_STATVFS *)EIO_BUF(req))
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#define EIO_PATH(req) ((char *)(req)->ptr1)
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/* submit a request for execution */
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void eio_submit (eio_req *req);
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/* cancel a request as soon fast as possible, if possible */
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void eio_cancel (eio_req *req);
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/*****************************************************************************/
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/* convenience functions */
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eio_ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count);
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eio_ssize_t eio__pread (int fd, void *buf, size_t count, off_t offset);
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eio_ssize_t eio__pwrite (int fd, void *buf, size_t count, off_t offset);
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#ifdef __cplusplus
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}
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#endif
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#endif
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