linux-ext4 - Re: [PATCH 1/6][TAKE7] manpage for fallocate

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Message-ID: <20070716053235.GA10945@amitarora.in.ibm.com>
Date:	Mon, 16 Jul 2007 11:02:35 +0530
From:	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>
To:	Michael Kerrisk <michael.kerrisk@....net>
Cc:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, mtk-manpages@....net, dgc@....com,
	adilger@...sterfs.com, suparna@...ibm.com, cmm@...ibm.com,
	tytso@....edu, xfs@....sgi.com
Subject: Re: [PATCH 1/6][TAKE7] manpage for fallocate

On Sat, Jul 14, 2007 at 10:23:42AM +0200, Michael Kerrisk wrote:
> [CC += mtk-manpages@....net]
> 
> Amit,
 
Hi Michael,

> Thanks for this page.  I will endeavour to review it in 
> the coming days.  In the meantime, the better address to CC
> me on fot man pages stuff is mtk-manpages@....net.

Sure.

BTW, this man page has changed a bit and the one in TAKE8 of fallocate
patches is the latest one. You are copied on that too.
I will forward that mail to "mtk-manpages@....net" id also, so that you
do not miss it. Thanks!

--
Regards,
Amit Arora

> 
> Cheers,
> 
> Michael
> 
> > Following is the modified version of the manpage originally submitted by
> > David Chinner. Please use `nroff -man fallocate.2 | less` to view.
> > 
> > This includes changes suggested by Heikki Orsila and Barry Naujok.
> > 
> > 
> > .TH fallocate 2
> > .SH NAME
> > fallocate \- allocate or remove file space
> > .SH SYNOPSIS
> > .nf
> > .B #include <fcntl.h>
> > .PP
> > .BI "long fallocate(int " fd ", int " mode ", loff_t " offset ", loff_t "
> > len);
> > .SH DESCRIPTION
> > The
> > .B fallocate
> > syscall allows a user to directly manipulate the allocated disk space
> > for the file referred to by
> > .I fd
> > for the byte range starting at
> > .I offset
> > and continuing for
> > .I len
> > bytes.
> > The
> > .I mode
> > parameter determines the operation to be performed on the given range.
> > Currently there are two modes:
> > .TP
> > .B FALLOC_ALLOCATE
> > allocates and initialises to zero the disk space within the given range.
> > After a successful call, subsequent writes are guaranteed not to fail
> > because
> > of lack of disk space.  If the size of the file is less than
> > .IR offset + len ,
> > then the file is increased to this size; otherwise the file size is left
> > unchanged.
> > .B FALLOC_ALLOCATE
> > closely resembles
> > .BR posix_fallocate (3)
> > and is intended as a method of optimally implementing this function.
> > .B FALLOC_ALLOCATE
> > may allocate a larger range than that was specified.
> > .TP
> > .B FALLOC_RESV_SPACE
> > provides the same functionality as
> > .B FALLOC_ALLOCATE
> > except it does not ever change the file size. This allows allocation
> > of zero blocks beyond the end of file and is useful for optimising
> > append workloads.
> > .SH RETURN VALUE
> > .B fallocate
> > returns zero on success, or an error number on failure.
> > Note that
> > .I errno
> > is not set.
> > .SH ERRORS
> > .TP
> > .B EBADF
> > .I fd
> > is not a valid file descriptor, or is not opened for writing.
> > .TP
> > .B EFBIG
> > .IR offset + len
> > exceeds the maximum file size.
> > .TP
> > .B EINVAL
> > .I offset
> > was less than 0, or
> > .I len
> > was less than or equal to 0.
> > .TP
> > .B ENODEV
> > .I fd
> > does not refer to a regular file or a directory.
> > .TP
> > .B ENOSPC
> > There is not enough space left on the device containing the file
> > referred to by
> > .IR fd .
> > .TP
> > .B ESPIPE
> > .I fd
> > refers to a pipe of file descriptor.
> > .TP
> > .B ENOSYS
> > The filesystem underlying the file descriptor does not support this
> > operation.
> > .TP
> > .B EINTR
> > A signal was caught during execution
> > .TP
> > .B EIO
> > An I/O error occurred while reading from or writing to a file system.
> > .TP
> > .B EOPNOTSUPP
> > The mode is not supported on the file descriptor.
> > .SH AVAILABILITY
> > The
> > .B fallocate
> > system call is available since 2.6.XX
> > .SH SEE ALSO
> > .BR syscall (2),
> > .BR posix_fadvise (3),
> > .BR ftruncate (3).
> 
> -- 
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