Copyright (c) 2013 Hudson River Trading LLC
Written by: John H. Baldwin <jhb@FreeBSD.org>
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$FreeBSD$
.Dd October 3, 2013 .Dt VOP_ALLOCATE 9 .Os .Sh NAME .Nm VOP_ALLOCATE .Nd allocate storage for a file .Sh SYNOPSIS n sys/param.h n sys/vnode.h .Ft int .Fn VOP_ALLOCATE "struct vnode *vp" "off_t *offset" "off_t *len" .Sh DESCRIPTION This call allocates storage for a range of offsets in a file. It is used to implement the .Xr posix_fallocate system call.
p Its arguments are: l -tag -width offset t Fa vp The vnode of the file. t Fa offset The start of the range to allocate storage for in the file. t Fa len The length of the range to allocate storage for in the file. .El
p The .Fa offset and .Fa len arguments are updated to reflect the portion of the range that still needs to be allocated on return. A partial allocation is considered a successful operation. The file's contents are not changed. .Sh LOCKS The file should be exclusively locked on entry and will still be locked on exit. .Sh RETURN VALUES Zero is returned if the call is successful, otherwise an appropriate error code is returned. .Sh ERRORS l -tag -width Er t Bq Er EFBIG An attempt was made to write a file that exceeds the process's file size limit or the maximum file size. t Bq Er ENOSPC The file system is full. t Bq Er EPERM An append-only flag is set on the file, but the caller is attempting to write before the current end of file. .El .Sh SEE ALSO .Xr vnode 9 , .Xr VOP_READ 9 , .Xr VOP_WRITE 9