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[linuxjm/jm.git] / manual / LDP_man-pages / draft / man2 / fallocate.2

.\" Copyright (c) 2007 Silicon Graphics, Inc. All Rights Reserved
.\" Written by Dave Chinner <dgc@sgi.com>
.\" May be distributed as per GNU General Public License version 2.
.\"
.\" Japanese Version Copyright (c) 2007  Akihiro MOTOKI
.\"         all rights reserved.
.\" Translated 2007-10-16, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v2.66
.\" Updated 2008-10-13, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v3.11
.\" 
.TH FALLOCATE 2 2009-03-13 "Linux" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O fallocate \- manipulate file space
fallocate \- ¥Õ¥¡¥¤¥ë¶õ´Ö¤ÎÁàºî
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.nf
#define _GNU_SOURCE
.B #include <fcntl.h>

.BI "int fallocate(int " fd ", int " mode ", off_t " offset \
", off_t " len ");"
.fi
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O This is a nonportable, Linux-specific system call.
.\"O For the portable, POSIX.1-specified method of ensuring that space
.\"O is allocated for a file, see
.\"O .BR posix_fallocate ().
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POSIX.1 ¤Çµ¬Äꤵ¤ì¤¿ÊýË¡¤Ç¤¢¤ë
.BR posix_fallocate (3)
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.\"O .BR fallocate ()
.\"O allows the caller to directly manipulate the allocated disk space
.\"O for the file referred to by
.\"O .I fd
.\"O for the byte range starting at
.\"O .I offset
.\"O and continuing for
.\"O .I len
.\"O bytes.
.BR fallocate ()
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.I fd
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.I offset
¤«¤é»Ï¤Þ¤ëŤµ
.I len
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.\"O The
.\"O .I mode
.\"O argument determines the operation to be performed on the given range.
.\"O Currently only one flag is supported for
.\"O .IR mode :
.I mode
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.I mode
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.TP
.B FALLOC_FL_KEEP_SIZE
.\"O This flag allocates and initializes to zero the disk space
.\"O within the range specified by
.\"O .I offset
.\"O and
.\"O .IR len .
.\"O After a successful call, subsequent writes into this range
.\"O are guaranteed not to fail because of lack of disk space.
¤³¤Î¥Õ¥é¥°¤Ï¡¢
.I offset
¤È
.I len
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.\"O Preallocating zeroed blocks beyond the end of the file
.\"O is useful for optimizing append workloads.
.\"O Preallocating blocks does not change
.\"O the file size (as reported by
.\"O .BR stat (2))
.\"O even if it is less than
.\"O .IR offset + len .
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³ä¤êÅö¤Æ¤Æ¤ª¤¯¤³¤È¤Ï¡¢Äɵ­ (append) ¤Îºî¶ÈÉé²Ù¤òºÇŬ²½¤¹¤ë¤Î¤Ë
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.IR offset + len
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.RB ( stat (2)
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.\"
.\" Note from Amit Arora:
.\" There were few more flags which were discussed, but none of
.\" them have been finalized upon. Here are these flags:
.\" FA_FL_DEALLOC, FA_FL_DEL_DATA, FA_FL_ERR_FREE, FA_FL_NO_MTIME,
.\" FA_FL_NO_CTIME
.\" All of the above flags were debated upon and we can not say
.\" if any/which one of these flags will make it to the later kernels.
.PP
.\"O If
.\"O .B FALLOC_FL_KEEP_SIZE
.\"O flag is not specified in
.\"O .IR mode ,
.\"O the default behavior is almost same as when this flag is specified.
.\"O The only difference is that on success,
.\"O the file size will be changed if
.\"O .I "offset + len"
.\"O is greater than the file size.
.\"O This default behavior closely resembles the behavior of the
.\"O .BR posix_fallocate (3)
.\"O library function,
.\"O and is intended as a method of optimally implementing that function.
.B FALLOC_FL_KEEP_SIZE
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.I mode
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.B FALLOC_FL_KEEP_SIZE
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.I "offset + len"
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.BR posix_fallocate (3)
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.BR posix_fallocate (3)
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.PP
.\"O Because allocation is done in block size chunks,
.\"O .BR fallocate ()
.\"O may allocate a larger range than that which was specified.
³ä¤êÅö¤Æ¤Ï¥Ö¥í¥Ã¥¯¥µ¥¤¥ºÃ±°Ì¤Ç¹Ô¤ï¤ì¤ë¤¿¤á¡¢
.BR fallocate ()
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.\"O .SH RETURN VALUE
.SH ÊÖ¤êÃÍ
.\"O .BR fallocate ()
.\"O returns zero on success, and -1 on failure.
.BR fallocate ()
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.\"O .SH ERRORS
.SH ¥¨¥é¡¼
.TP
.B EBADF
.\"O .I fd
.\"O is not a valid file descriptor, or is not opened for writing.
.I fd
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.TP
.B EFBIG
.\"O .IR offset + len
.\"O exceeds the maximum file size.
.I offset + len
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.TP
.B EINTR
.\"O A signal was caught during execution.
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.TP
.B EINVAL
.\"O .I offset
.\"O was less than 0, or
.\"O .I len
.\"O was less than or equal to 0.
.I offset
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.I len
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.TP
.B EIO
.\"O An I/O error occurred while reading from or writing to a file system.
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.TP
.B ENODEV
.\"O .I fd
.\"O does not refer to a regular file or a directory.
.\"O (If
.\"O .I fd
.\"O is a pipe or FIFO, a different error results.)
.I fd
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.RI ( fd
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.TP
.B ENOSPC
.\"O There is not enough space left on the device containing the file
.\"O referred to by
.\"O .IR fd .
.I fd
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.TP
.B ENOSYS
.\"O The file system containing the file referred to by
.\"O .I fd
.\"O does not support this operation.
.I fd
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.TP
.B EOPNOTSUPP
.\"O The
.\"O .I mode
.\"O is not supported by the file system containing the file referred to by
.\"O .IR fd .
.I fd
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.I mode
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.\"O .SH VERSIONS
.SH ¥Ð¡¼¥¸¥ç¥ó
.\"O .BR fallocate ()
.\"O is available on Linux since kernel 2.6.23.
.\"O Support is provided by glibc since version 2.10.
.BR fallocate ()
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.\"O .SH CONFORMING TO
.SH ½àµò
.\"O .BR fallocate ()
.\"O is Linux-specific.
.BR fallocate ()
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.\"O .SH SEE ALSO
.SH ´ØÏ¢¹àÌÜ
.BR ftruncate (2),
.BR posix_fadvise (3),
.BR posix_fallocate (3)