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Signed-off-by: Karel Zak <kzak@redhat.com>
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Make it possible to unmount a filesystem on a loop device if it is
specified by associated backing file. It does not attempt to unmount
anything if there are more than one loop device associated with the
given file.
Umount looks for associated loopdevice(s) only if umount is called
with the regular file as an argument.
Before:
mount -o loop -t ext2 img mnt
umount -v img
> Could not find /home/puzel/upstream/util-linux/img in mtab
> umount: img: not mounted
After:
mount -o loop -t ext2 img mnt
umount -v img
> img is associated with /dev/loop0, trying to unmount it
> /dev/loop0 has been unmounted
[kzak@redhat.com: - fix memory leak in lomount.c]
Addresses: https://bugzilla.novell.com/show_bug.cgi?id=666161
Signed-off-by: Petr Uzel <petr.uzel@suse.cz>
Signed-off-by: Karel Zak <kzak@redhat.com>
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On systems without /etc/mtab (or everywhere if kernel >= 2.6.37)
we use loop autoclear flag and then the backing file name is not
stored in /etc/mtab. mount(8) uses sysfs to get the filename (or
LOOP_GET_STATU* ioctls on old kernels).
Signed-off-by: Karel Zak <kzak@redhat.com>
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The new loop auto-destruct feature detaches automatically loop devices
when no longer used. This means they are detached with the umount()
call. But when we call umount with -d, del_loop() is called and fails
because the ioctl() returns ENXIO. We have to check for autoclear
loop devices rather than blindly call del_loop().
Reported-by: Matthias Koenig <mkoenig@suse.de>
Signed-off-by: Karel Zak <kzak@redhat.com>
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[kzak@redhat.com: split the original patch to small patches]
Signed-off-by: Shachar Shemesh <shachar@debian.org>
Signed-off-by: Karel Zak <kzak@redhat.com>
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This allows a flag to be set on loop devices so that when they are closed
for the last time, they'll self-destruct.
The kernel part has been submitted to lkml by David Woodhouse.
Signed-off-by: Bernardo Innocenti <bernie@codewiz.org>
Signed-off-by: Karel Zak <kzak@redhat.com>
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The mount syscall prevents mounting the same device twice
to the same mountpoint. When loop mounting a file, for each
file a new loop device gets allocated, which prevents the detection
of loop mounting the same file to the same mountpoint twice.
The patch adds a check to prevent double mounts, if the same loopfile
is going to be mounted with the same offset to the same mountpoint.
Co-Author: Matthias Koenig <mkoenig@suse.de>
Signed-off-by: Matthias Koenig <mkoenig@suse.de>
Signed-off-by: Karel Zak <kzak@redhat.com>
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Signed-off-by: Karel Zak <kzak@redhat.com>
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