Module Name: src
Committed By: riastradh
Date: Wed Mar 27 00:46:17 UTC 2024
Modified Files:
src/usr.sbin/mountd: exports.5
Log Message:
exports(5): Revert warning about `-ro' on read/write file systems.
Looks like the nfs server does enforce that after all, in spite of
the rather oblique commentary in the BUGS section about export
options being tied to local mount point options with which they must
be noncontradictory.
And there's no reason in principle it shouldn't enforce this -- it
just need to block various file system _operations_, rather than the
subtree issue where the criteria for evaluating whether operations
are allowed on particular _file handles_ are too painful to
contemplate.
PR misc/58063
To generate a diff of this commit:
cvs rdiff -u -r1.33 -r1.34 src/usr.sbin/mountd/exports.5
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/usr.sbin/mountd/exports.5
diff -u src/usr.sbin/mountd/exports.5:1.33 src/usr.sbin/mountd/exports.5:1.34
--- src/usr.sbin/mountd/exports.5:1.33 Tue Mar 26 23:32:43 2024
+++ src/usr.sbin/mountd/exports.5 Wed Mar 27 00:46:17 2024
@@ -1,4 +1,4 @@
-.\" $NetBSD: exports.5,v 1.33 2024/03/26 23:32:43 riastradh Exp $
+.\" $NetBSD: exports.5,v 1.34 2024/03/27 00:46:17 riastradh Exp $
.\"
.\" Copyright (c) 1989, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
@@ -174,33 +174,14 @@ This option is currently not implemented
.Pp
The
.Fl ro
-option should be specified for filesystems that are read-only (default
-is to assume read/write).
+option specifies that the filesystem should be exported read-only
+(default read/write).
The option
.Fl o
is a synonym for
.Fl ro
in an effort to be backward compatible with older export file formats.
.Pp
-.Bf -symbolic
-Warning:
-Exporting a read/write filesystem with
-.Fl ro
-.Em does not
-prevent clients from writing to it.
-.Ef
-To prevent clients from writing to a filesystem, it must be mounted
-read-only
-.Em on the server
-in the first place.
-To export a read/write filesystem so clients can only read from it, not
-write to it, you can mount a read-only nullfs from the filesystem with
-.Xr mount_null 8
-using the
-.Fl o Cm ro
-option, and then export the read-only nullfs instead.
-See also caveats about nullfs namespace below.
-.Pp
The
.Fl noresvport
option specifies that NFS RPC calls for the filesystem do not have to come
@@ -424,7 +405,7 @@ systems.
.Pp
.Pp
Filesystems that provide a namespace for a subtree of another
-filesystem such as nullfs
+filesystem such as nullfs
.No ( Xr mount_null 8 )
and umapfs
.No ( Xr mount_umap 8 )
