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				.Dd July 9, 2001
				.Dt VN_DEALLOCATE 9
				.Os
				.Sh NAME
				.Nm vn_deallocate
				.Nd zero and/or deallocate storage from a file
				.Sh SYNOPSIS
				.In sys/param.h
				.In sys/vnode.h
				.Ft int
				.Fn vn_deallocate "struct vnode vp" "off_t offset" "off_t len" "int flags" "int ioflg" "struct ucred active_cred" "struct ucred *file_cred"
				.Sh DESCRIPTION
				The
				.Fn vn_deallocate
				function zeros and/or deallocate backing storage space from a file.
				This function only works on vnodes with
				bcrUnsubmitted Done Inline Actions Not sure about this one: s/deallocate/deallocates/ bcr: Not sure about this one: s/deallocate/deallocates/
				.Dv VREG
				type.
				.Pp
				The arguments are:
				.Bl -tag -width active_cred
				.It Fa vp
				The vnode of the file.
				.It Fa offset
				The starting offset of the operation range
				.It Fa len
				The length of the operation range. This argument must be greater than 0.
				.It Fa flags
				bcrUnsubmitted Not Done Inline Actions Needs a line break here after the sentence stop. bcr: Needs a line break here after the sentence stop.
				The control flags argument of the operation.
				.It Fa ioflg
				The control flags argument of vnode locking.
				.It Fa active_cred
				The user credentials of the calling thread.
				.It Fa file_cred
				The credentials installed on the file description pointing to the vnode or NOCRED.
				.El
				.Pp
				The
				.Fn flags
				argument may be one or more of the following flags:
				.Bl -tag -width SPACECTL_F_CANEXTEND
				.It Dv SPACECTL_F_CANEXTEND
				The operation can extend the file size if
				.Fa offset
				+
				.Fa len
				is greater than the current file size.
				kibUnsubmitted Not Done Inline Actions What is this? kib: What is this?
				khngAuthorUnsubmitted Done Inline Actions Leftover from implementing posix_fallocate. Will clean this up. khng: Leftover from implementing posix_fallocate. Will clean this up.
				.El
				.Pp
				The
				.Fn ioflg
				argument may be one or more of the following flags:
				.Bl -tag -width IO_RANGELOCKED
				.It Dv IO_NODELOCKED
				The caller has granted vnode lock.
				.It Dv IO_RANGELOCKED
				The caller has granted vnode rangelock.
				kibUnsubmitted Not Done Inline Actions What it means 'granted'? kib: What it means 'granted'?
				khngAuthorUnsubmitted Done Inline Actions 'acquired' khng: 'acquired'
				.El
				.Sh RETURN VALUES
				Upon successful completion, the value 0 is returned; otherwise the
				appropriate error is returned.
				.Sh SEE ALSO
				.Xr vnode 9 ,
				.Xr VOP_DEALLOCATE 9
				.Sh AUTHORS
				.Nm
				and this manual page were developed by
				.An Ka Ho Ng Aq Mt khng@FreeBSDFoundation.org
				under sponsorship from the FreeBSD Foundation.