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make description of VOP_MMAP compatible with reality

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pooka 2007-05-07 21:41:49 +00:00
parent 01b74015fe
commit 71ab04cbde
1 changed files with 12 additions and 11 deletions
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23
share/man/man9/vnodeops.9
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@ -1,4 +1,4 @@
.\" $NetBSD: vnodeops.9,v 1.61 2007/03/29 12:06:58 pooka Exp $
.\" $NetBSD: vnodeops.9,v 1.62 2007/05/07 21:41:49 pooka Exp $
.\"
.\" Copyright (c) 2001, 2005, 2006 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -34,7 +34,7 @@
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd March 29, 2007
.Dd May 8, 2007
.Dt VNODEOPS 9
.Os
.Sh NAME
@ -764,10 +764,9 @@ are also eliminated.
If the operation is successful zero is returned, otherwise an
appropriate error is returned.
.It Fn VOP_MMAP "vp" "fflags" "cred" "l"
Map file into user address space.
The argument
Inform file system that
.Fa vp
is the locked vnode of the file to map into an address space.
is in the process of being memory mapped.
The argument
.Fa fflags
is a set of flags.
@ -776,14 +775,16 @@ The argument
is the caller's credentials and
.Fa l
the calling process requesting the map.
If the operation is successful, zero is returned, otherwise an
appropriate error code is returned.
If the file system allows the memory mapping, zero is returned, otherwise
an appropriate error code is returned.
.Pp
Most file systems do not supply a function for
.Fn VOP_MMAP .
This function implements the
.Xr mmap 2
system call.
.Fn VOP_MMAP
and use
.Fn genfs_mmap
to default for success.
Only file systems which do not integrate with the page cache at all
typically want to disallow memory mapping.
.It Fn VOP_FSYNC "vp" "cred" "flags" "offlo" "offhi" "l"
Flush pending data buffers for a file to disk.
The argument