Le 04/16/12 03:17, Denys Vlasenko a écrit :
On Friday 06 April 2012 10:41, Florian Fainelli wrote:
I have been recently caught by an interesting issue, illustrated by the
following use case:
"foo" is a cramfs filesystem file which might help illustrate the issue
below:
1) loopback mount "foo" to mount point /bar
2) umount /bar
3) append new files and re-generate the "foo" cramfs image
4) loopback mount "foo" to mount point /bar again
5) the contents of /bar are the same as in 1) and not 3)
the reason for this is because busybox has not deleted the "foo"<->
loopback device mapping, so when we attempt to mount again "foo", the
mapping is already there, so the loopback device is not deleted then
re-created.
util-linux' umount unconditionnaly deletes the loop device upon umount
It does that? Really? Which version of util-linux did you test?
Yes it does, util-linux on my system is at 2.19.1. Ralf suggested
off-list to me that util-linux might do this automatically when
/etc/mtab is not a symlink to /proc/mounts.
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