More locking clarifications. Add skeleton manual page for VOP_LEASE

share/man/man9/Makefile

@@ -5,7 +5,7 @@ MAN9=	MD5.9 \
 	VFS_ROOT.9 VFS_START.9 VFS_STATFS.9 VFS_SYNC.9 VFS_UNMOUNT.9 \
 	VFS_VGET.9 VFS_VPTOFH.9 VFS_CHECKEXP.9 \
 	VOP_ABORTOP.9 VOP_ACCESS.9 VOP_ADVLOCK.9 VOP_ATTRIB.9 \
-	VOP_BWRITE.9 VOP_CREATE.9 VOP_FSYNC.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_LOCK.9 VOP_LOOKUP.9 VOP_MMAP.9 VOP_OPENCLOSE.9 \
 	VOP_PATHCONF.9 VOP_PRINT.9 VOP_RDWR.9 VOP_READDIR.9 \

share/man/man9/VOP_LEASE.9

@@ -0,0 +1,57 @@
+.\" -*- nroff -*-
+.\"
+.\" Copyright (c) 1996 Doug Rabson
+.\"
+.\" All rights reserved.
+.\"
+.\" This program is free software.
+.\"
+.\" 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 24, 1999
+.Os
+.Dt VOP_LEASE 9
+.Sh NAME
+.Nm VOP_LEASE
+.Nd Validates a vnode for a particular set of credentials and operation type
+.Sh SYNOPSIS
+.Ft int
+.Fn VOP_LEASE "struct vnode *vp" "struct proc *p" "struct ucred *cred" "int type"
+.Sh DESCRIPTION
+This entry point is currently not implemented.  I believe the idea is to 
+validate a vnode for a particular set of user credentials and operation type.
+The two operation types supported are LEASE_READ and LEASE_WRITE.  The 
+function currently always returns 0.
+.Pp
+.Sh LOCKS
+The vnode must be exclusively locked on entry, and should remain exclusively
+locked on return.
+.Sh RETURN VALUES
+If successful, zero is returned.  Otherwise, well... zero is returned too.
+.Sh ERRORS
+.Sh SEE ALSO
+.Xr VOP_READ 9 ,
+.Xr VOP_WRITE 9
+.Sh AUTHORS
+This man page was written by
+.An Matt Dillon .

share/man/man9/VOP_LINK.9

@@ -60,9 +60,10 @@ The directory,
 is locked on entry and should remain locked on return.
 The file
 .Fa vp
-is not locked on entry and should be left unlocked on return.
+is not locked on entry and should remain that way on return.
-If the VOP routine locks the file, it must remember to unlock it
+If your VOP code locks
-prior to returning.
+.Fa vp ,
+it must be sure to unlock prior to returning.
 .Sh RETURN VALUES
 Zero is returned if the file was linked successfully, otherwise an
 error is returned.
@@ -126,7 +127,8 @@ out2:
 the file is immutable
 .El
 .Sh SEE ALSO
-.Xr vnode 9
+.Xr vnode 9 ,
+.Xr vn_lock 9
 .Sh AUTHORS
-This man page was written by
+This man page was originally written by
 .An Doug Rabson .

share/man/man9/VOP_RENAME.9

@@ -59,11 +59,13 @@ the vnode of the target file (if it exists)
 pathname information about the file's new name
 .El
 .Sh LOCKS
-The source directory and file will have their ref count bumped on entry.
+The source directory and file are unlocked but are expected to have their
-The destination directory and file will be locked and referenced on entry.
+ref count bumped on entry.  The VOP routine is expected to vrele() both prior
-The procedure must release (not unlock) the source directory and file,
+to returning.
-and must relase and unlock (i.e. vput) the destination directory and file
+.Pp
-prior to return.
+The destination directory and file are locked as well as having their ref
+count bumped.  The VOP routine is expected to vput() both prior to 
+returning.
 .Sh PSEUDOCODE
 .Bd -literal
 int