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Note error when FFS does not support whiteouts and how to fix. (PR 3233)

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phil 1997-06-30 20:06:39 +00:00
parent be5f7db95e
commit fb200132e5
1 changed files with 12 additions and 6 deletions
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18
sbin/mount_union/mount_union.8
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@ -1,4 +1,4 @@
.\" $NetBSD: mount_union.8,v 1.5 1996/01/15 02:00:21 thorpej Exp $
.\" $NetBSD: mount_union.8,v 1.6 1997/06/30 20:06:39 phil Exp $
.\"
.\" Copyright (c) 1994
.\" The Regents of the University of California. All rights reserved.
@ -182,15 +182,21 @@ accessible via
.Xr unmount 2 ,
.Xr fstab 5 ,
.Xr mount 8 ,
.Xr mount_null 8
.Xr mount_null 8 ,
.Xr fsck_ffs 8
.Sh BUGS
Without whiteout support from the filesystem backing the upper layer,
there is no way that delete and rename operations on lower layer
objects can be done.
.Dv EROFS
is returned for this kind of operations along with any others
which would make modifications to the lower layer, such as
.Xr chmod 1 .
An attempt to mount a union directory under one which does not
have whiteout support will return
.Dv EOPNOTSUPP
(``Operation not supported'').
Whiteout support can be added to an existing FFS filesystem
by using the
.Fl c
option of
.Xr fsck_ffs 8 .
.Pp
Running
.Xr find 1