You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
54 lines
2.2 KiB
54 lines
2.2 KiB
6 years ago
|
From 0ae2aa6a43a852cb0326faade1532c02aa7617a4 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Karel Zak <kzak@redhat.com>
|
||
|
|
Date: Fri, 20 Apr 2018 09:50:04 +0200
|
||
|
|
Subject: [PATCH 156/173] umount: add note about --lazy
|
||
|
|
|
||
|
|
Unfortunately, it's pretty common that users on production systems use
|
||
|
|
lazy umount to fix some FS issues. The usual result is unwanted system
|
||
|
|
reboot, because -l is not the right way how to fix unreachable NFS or
|
||
|
|
mess with local FS with submounts.
|
||
|
|
|
||
|
|
Note that after lazy umount /proc/self/mountinfo does not contain the
|
||
|
|
FS entry, but kernel still references the FS. It makes it very
|
||
|
|
difficult to debug.
|
||
|
|
|
||
|
|
Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1566674
|
||
|
|
Suggested-by: Steve Dickson <steved@redhat.com>
|
||
|
|
Signed-off-by: Karel Zak <kzak@redhat.com>
|
||
|
|
Upstream: http://github.com/karelzak/util-linux/commit/031800ff6c66b4d62229cfd116195950a718a21c
|
||
|
|
---
|
||
|
|
sys-utils/umount.8 | 10 +++++++++-
|
||
|
|
1 file changed, 9 insertions(+), 1 deletion(-)
|
||
|
|
|
||
|
|
diff --git a/sys-utils/umount.8 b/sys-utils/umount.8
|
||
|
|
index f0a712b06..71c2155b4 100644
|
||
|
|
--- a/sys-utils/umount.8
|
||
|
|
+++ b/sys-utils/umount.8
|
||
|
|
@@ -54,7 +54,8 @@ working directory there, or when a swap file on it is in use. The
|
||
|
|
offending process could even be
|
||
|
|
.B umount
|
||
|
|
itself - it opens libc, and libc in its turn may open for example locale
|
||
|
|
-files. A lazy unmount avoids this problem.
|
||
|
|
+files. A lazy unmount avoids this problem, but it may introduce another
|
||
|
|
+issues. See \fB\-\-lazy\fR description bellow.
|
||
|
|
.SH OPTIONS
|
||
|
|
.TP
|
||
|
|
\fB\-a\fR, \fB\-\-all\fR
|
||
|
|
@@ -107,6 +108,13 @@ Unmount without writing in
|
||
|
|
Lazy unmount. Detach the filesystem from the filesystem hierarchy now,
|
||
|
|
and cleanup all references to the filesystem as soon as it is not busy
|
||
|
|
anymore. (Requires kernel 2.4.11 or later.)
|
||
|
|
+
|
||
|
|
+A system reboot would be expected in near future if you're going to use this
|
||
|
|
+option for network filesystem or local filesystem with submounts. The
|
||
|
|
+recommended use-case for \fBumount -l\fR is to prevent hangs on shutdown due to
|
||
|
|
+an unreachable network share where a normal umount will hang due to a downed
|
||
|
|
+server or a network partition. Remounts of the share will not be possible.
|
||
|
|
+
|
||
|
|
.TP
|
||
|
|
\fB\-O\fR, \fB\-\-test\-opts\fR \fIoptions,list\fR
|
||
|
|
Indicate that the actions should only be taken on file systems with the
|
||
|
|
--
|
||
|
|
2.14.4
|
||
|
|
|