mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-20 11:11:24 +00:00
Add man page for VOP_GETVOBJECT, VOP_CREATEVOBJECT and VOP_DESTROYVOBJECT
operations. Reviewed by: sheldonh
This commit is contained in:
Boris Popov
parent
adce2a1b4b
commit
c7adfa9cf9
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=72087
@ -6,7 +6,7 @@ MAN9= CONDSPLASSERT.9 DELAY.9 KASSERT.9 MD5.9 SPLASSERT.9 \
|
||||
VFS_VGET.9 VFS_VPTOFH.9 VFS_CHECKEXP.9 \
|
||||
VOP_ACCESS.9 VOP_ADVLOCK.9 VOP_ATTRIB.9 \
|
||||
VOP_BWRITE.9 VOP_CREATE.9 VOP_FSYNC.9 VOP_LEASE.9 \
|
||||
VOP_GETPAGES.9 VOP_INACTIVE.9 VOP_IOCTL.9 VOP_LINK.9 \
|
||||
VOP_GETPAGES.9 VOP_GETVOBJECT.9 VOP_INACTIVE.9 VOP_IOCTL.9 VOP_LINK.9 \
|
||||
VOP_LOCK.9 VOP_LOOKUP.9 VOP_OPENCLOSE.9 \
|
||||
VOP_PATHCONF.9 VOP_PRINT.9 VOP_RDWR.9 VOP_READDIR.9 \
|
||||
VOP_READLINK.9 VOP_REALLOCBLKS.9 VOP_REMOVE.9 VOP_RENAME.9 \
|
||||
@ -59,6 +59,8 @@ MLINKS+=VOP_CREATE.9 VOP_MKDIR.9
|
||||
MLINKS+=VOP_CREATE.9 VOP_MKNOD.9
|
||||
MLINKS+=VOP_CREATE.9 VOP_SYMLINK.9
|
||||
MLINKS+=VOP_GETPAGES.9 VOP_PUTPAGES.9
|
||||
MLINKS+=VOP_GETVOBJECT.9 VOP_CREATEVOBJECT.9
|
||||
MLINKS+=VOP_GETVOBJECT.9 VOP_DESTROYVOBJECT.9
|
||||
MLINKS+=VOP_INACTIVE.9 VOP_RECLAIM.9
|
||||
MLINKS+=VOP_LOCK.9 VOP_ISLOCKED.9
|
||||
MLINKS+=VOP_LOCK.9 VOP_UNLOCK.9
|
||||
|
||||
111
share/man/man9/VOP_GETVOBJECT.9
Normal file
111
share/man/man9/VOP_GETVOBJECT.9
Normal file
@ -0,0 +1,111 @@
|
||||
.\" -*- nroff -*-
|
||||
.\"
|
||||
.\" Copyright (c) 2000 Boris Popov
|
||||
.\"
|
||||
.\" Redistribution and use in source and binary forms, with or without
|
||||
.\" modification, are permitted provided that the following conditions
|
||||
.\" are met:
|
||||
.\" 1. Redistributions of source code must retain the above copyright
|
||||
.\" notice, this list of conditions and the following disclaimer.
|
||||
.\" 2. Redistributions in binary form must reproduce the above copyright
|
||||
.\" notice, this list of conditions and the following disclaimer in the
|
||||
.\" documentation and/or other materials provided with the distribution.
|
||||
.\"
|
||||
.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
|
||||
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||||
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
||||
.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
||||
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||||
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||||
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
||||
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
.\"
|
||||
.\" $FreeBSD$
|
||||
.\"
|
||||
.Dd Sep 10, 2000
|
||||
.Os
|
||||
.Dt VOP_CREATEVOBJECT 9
|
||||
.Sh NAME
|
||||
.Nm VOP_CREATEVOBJECT ,
|
||||
.Nm VOP_DESTROYVOBJECT ,
|
||||
.Nm VOP_GETVOBJECT
|
||||
.Nd VM object interaction
|
||||
.Sh SYNOPSIS
|
||||
.Fd #include <sys/param.h>
|
||||
.Fd #include <sys/vnode.h>
|
||||
.Ft int
|
||||
.Fn VOP_CREATEVOBJECT "struct vnode *vp" "struct ucred *cred" "struct proc *p"
|
||||
.Ft int
|
||||
.Fn VOP_DESTROYVOBJECT "struct vnode *vp"
|
||||
.Ft int
|
||||
.Fn VOP_GETVOBJECT "struct vnode *vp" "struct vm_object **objpp"
|
||||
.Sh DESCRIPTION
|
||||
These calls are used to control the association of a VM object
|
||||
with a particular vnode.
|
||||
.Pp
|
||||
The arguments specific to these functions are:
|
||||
.Bl -tag -width objpp
|
||||
.It Ar vp
|
||||
the vnode of the file
|
||||
.It Ar objpp
|
||||
the VM object being returned, or
|
||||
.Dv NULL
|
||||
if the caller wants to test for the existence
|
||||
of the VM object).
|
||||
.El
|
||||
.Pp
|
||||
.Xr VFS 9
|
||||
invokes
|
||||
.Fn VOP_CREATEVOBJECT
|
||||
when it needs to create a VM object for the given
|
||||
.Xr vnode 9 .
|
||||
Filesystem code may pass this call down to the underlying filesystem.
|
||||
This VOP can be called multiple times,
|
||||
and filesystem code should ignore any additional calls,
|
||||
exiting with a zero return code.
|
||||
.Pp
|
||||
.Fn VOP_DESTROYVOBJECT
|
||||
is called when a
|
||||
.Xr vnode 9
|
||||
is recycled.
|
||||
.Pp
|
||||
.Fn VOP_GETVOBJECT
|
||||
should be used by all kernel code to get a VM object.
|
||||
.\" XXX What is the next sentence trying to tell people?
|
||||
The returned VM object may belong to a different filesystem in the case
|
||||
of stacked mounts.
|
||||
.Pp
|
||||
.Xr VFS 9
|
||||
has three functions which perform standard operations by creating
|
||||
and destroying VM objects.
|
||||
These functions are:
|
||||
.Fn vop_stdcreatevobject ,
|
||||
.Fn vop_stddestroyvobject
|
||||
and
|
||||
.Fn vop_stdgetvobject .
|
||||
.Pp
|
||||
.Em Note:
|
||||
a
|
||||
.Xr vnode 9
|
||||
should be locked on entry and must be left locked on exit.
|
||||
.Sh RETURN VALUES
|
||||
The
|
||||
.Fn VOP_CREATEVOBJECT ,
|
||||
.Fn VOP_DESTROYVOBJECT
|
||||
and
|
||||
.Fn VOP_GETVOBJECT
|
||||
functions return zero on success, or a non-zero value on failure.
|
||||
Zero is returned on success, otherwise an error is returned.
|
||||
.Sh EXAMPLES
|
||||
.\" XXX Why is this code here when it does not use the functions
|
||||
.\" described in this manual page?
|
||||
By default, filesystems leave VM object handling to the vop_std* functions.
|
||||
.Sh SEE ALSO
|
||||
.Xr VOP_GETPAGES 9 ,
|
||||
.Xr VOP_PUTPAGES 9 ,
|
||||
.Xr vnode 9
|
||||
.Sh AUTHORS
|
||||
This man page was written by
|
||||
.An Boris Popov .
|
||||
Loading…
Reference in New Issue
Block a user