85 lines
2.8 KiB
Groff
85 lines
2.8 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 2013 Advanced Computing Technologies LLC
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.\" Written by: John H. Baldwin <jhb@FreeBSD.org>
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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
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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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 AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd October 3, 2013
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.Dt VOP_ALLOCATE 9
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.Os
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.Sh NAME
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.Nm VOP_ALLOCATE
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.Nd allocate storage for a file
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/vnode.h
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.Ft int
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.Fn VOP_ALLOCATE "struct vnode *vp" "off_t *offset" "off_t *len"
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.Sh DESCRIPTION
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This call allocates storage for a range of offsets in a file.
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It is used to implement the
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.Xr posix_fallocate
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system call.
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.Pp
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Its arguments are:
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.Bl -tag -width offset
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.It Fa vp
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The vnode of the file.
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.It Fa offset
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The start of the range to allocate storage for in the file.
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.It Fa len
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The length of the range to allocate storage for in the file.
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.El
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.Pp
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The
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.Fa offset
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and
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.Fa len
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arguments are updated to reflect the portion of the range that
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still needs to be allocated on return.
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A partial allocation is considered a successful operation.
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The file's contents are not changed.
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.Sh LOCKS
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The file should be exclusively locked on entry and will still be locked on exit.
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.Sh RETURN VALUES
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Zero is returned if the call is successful, otherwise an appropriate
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error code is returned.
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er EFBIG
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An attempt was made to write a file that exceeds the process's file size
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limit or the maximum file size.
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.It Bq Er ENOSPC
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The file system is full.
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.It Bq Er EPERM
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An append-only flag is set on the file, but the caller is attempting to
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write before the current end of file.
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.El
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.Sh SEE ALSO
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.Xr vnode 9 ,
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.Xr VOP_READ 9 ,
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.Xr VOP_WRITE 9
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