.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright (c) 2006 Andrew Morton <akpm@osdl.org>
.\" and Copyright 2006 Michael Kerrisk <mtk.manpages@gmail.com>
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date.  The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein.  The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" 2006-07-05 Initial creation, Michael Kerrisk based on
.\"     Andrew Morton's comments in fs/sync.c
.\"
.\" Japanese Version Copyright (c) 2007 Akihiro MOTOKI
.\"         all rights reserved.
.\" Translated 2007-01-09, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v2.43
.\" Updated 2008-08-06, Akihiro MOTOKI, LDP v3.05
.\"
.TH SYNC_FILE_RANGE 2 2008-05-27 "Linux" "Linux Programmer's Manual"
.SH ̾
sync_file_range \- sync a file segment with disk
.SH 
.nf
.B #define _GNU_SOURCE
.B #include <fcntl.h>

.BI "int sync_file_range(int " fd ", off64_t " offset ", off64_t " nbytes ,
.BI "                    unsigned int " flags );
.fi
.SH 
.BR sync_file_range ()
Ȥȡեǥץ
.I fd
ǻȤ륪ץ󤵤줿եΥǥȤƱ˴ؤơ
٤椬ǽȤʤ롣

.I offset
ϡƱԤեΰγϥХȤǤ롣
.I nbytes
ˤƱԤΰĹХñ̤ǻꤹ롣
.I nbytes
 0 ξϡ
.I offset
եޤǤХȤƱ롣
ƱϥƥΥڡñ̤ǹԤ롣
.I offset
ϥڡˤ碌ڤ겼졢
.I (offset+nbytes-1)
ϥڡˤ碌ڤ夲롣

ӥåȥޥ
.I flags
ˤϰʲͤꤹ뤳ȤǤ:
.TP
.B SYNC_FILE_RANGE_WAIT_BEFORE
餫ν񤭹ߤԤˡꤵ줿ΰΥڡ
񤭽ФԤ褦˥ǥХɥ饤ФˤǤ׵᤬ȯԤƤ
ڡν񤭽ФƴλΤԤġ
.TP
.B SYNC_FILE_RANGE_WRITE
ꤵ줿ΰΥڡǡ񤭽Ф׵᤬ȯԤƤʤ
Ƥ dirty (åѹƤ) ڡ
񤭽Ф򳫻Ϥ롣
ꥯȥ塼礭¿񤭹⤦Ȥˤϡ
ν (block) ǽդ뤳ȡ
.TP
.B SYNC_FILE_RANGE_WAIT_AFTER
餫ν񤭹߸ˡꤵ줿ΰƤΥڡ
񤭽ФԤΤԤġ
.PP
.I flags
 0 ꤷ硢⤷ʤȤɽ
.SS ܺ
ǤϤɤեΥ᥿ǡν񤭽ФԤʤ
äơץꥱ󤬳μ¤˺ѤߤΥǥ֥å
񤭤¹Ԥʤ¤ꡢåθǤǡѲǽǤ
ݾڤϤʤ

.B SYNC_FILE_RANGE_WAIT_BEFORE

.B SYNC_FILE_RANGE_WAIT_AFTER
 I/O 顼
.B ENOSPC
֤򸡽ФƤӽФˤξ֤

.I flags
ΩĥӥåȤȤ߹碌ʲ˼:
.TP
.B SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE
ꤵ줿ϰΥڡǡ
.BR sync_file_range ()
ƤӽФ줿ݤ dirty ǤäƤΥڡ
μ¤˽񤭽ФоݤȤʤ褦ˤ롣
ϡstart-write-for-data-integrity 
(ǡݤΤν񤭹߳Ϥ) Ǥ롣
.TP
.B SYNC_FILE_RANGE_WRITE
ꤵ줿ϰΥڡǡ߽񤭽ФǤʤƤ dirty ڡ
񤭽Ф򳫻Ϥ롣ƱΥǥؤΥեå (flush-to-disk)
Ǥ롣ǡݤɬפȤƤŬڤǤϤʤ
.TP
.BR SYNC_FILE_RANGE_WAIT_BEFORE " (or " SYNC_FILE_RANGE_WAIT_AFTER )
ꤵ줿ϰƤΥڡν񤭽ФδλԤġ
Υե饰ϡ˹Ԥ줿
.B SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE
θ˻ѤǤδλԤ̤뤳ȤǤ롣
.TP
.B SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE | \
SYNC_FILE_RANGE_WAIT_AFTER
 write-for-data-integrity 
(ǡݤΤν񤭹) Ǥꡢꤵ줿ϰΡ
.BR sync_file_range ()
ƤФ줿 dirty ƤΥڡ
ǥ˳Ǽ뤳Ȥݾڤ롣
.SH ֤
ξ硢
.BR sync_file_range ()
 0 ֤Ԥξ硢\-1 ֤
.I error
˥顼򼨤ͤꤹ롣
.SH 顼
.TP
.B EBADF
.I fd
ͭʥեǥץǤϤʤ
.TP
.B EINVAL
.I flags
ʥӥåȤꤵƤ롣ޤ
.I offset

.I nbytes
Ǥ롣
.TP
.B EIO
I/O 顼
.TP
.B ENOMEM
­Ǥ롣
.TP
.B ENOSPC
ǥΰ­Ǥ롣
.TP
.B ESPIPE
.I fd
̾Υե롢֥åǥХǥ쥯ȥꡢܥå
ʳΤΤؤƤ롣
.\" FIXME . (bug?) Actually, how can 'fd' refer to a symbolic link (S_ISLNK)?
.\" (In userspace at least) it isn't possible to obtain a file descriptor
.\" for a symbolic link.
.SH С
.BR sync_file_range ()
ϥͥ 2.6.17  Linux о줷
.SH 
Υƥॳ Linux ȼǤꡢ
ܿɬפʥץǤϻѤ򤱤٤Ǥ롣
.SH Ϣ
.BR fdatasync (2),
.BR fsync (2),
.BR msync (2),
.BR sync (2),
.BR feature_test_macros (7)