Right now, tgt-admin looks into /etc/mtab, /proc/swaps etc. to determine
if the device it wants to allocate is in use. This is a good way to
prevent the user from corrupting filesystems (i.e., mounting the device
locally to correct a config file, forgetting to unmount it, and
allocating it as a target), but unfortunately, it doesn't check all
kinds of "device-in-use" scenarios.
The following patches add a full support for detecting "used devices":
- used by the system: mounted, swap devices, parts of RAID array, LVM,
dm-crypt, etc.
- used by userspace, i.e. dd, e2fsck, existing tgtd target etc.
For "userspace" tests, lsof is needed. If it's not present, a warning
will be shown, informing the user that we can't check reliably if the
device is in use.
The check can be overridden by using --force command line option or
"allow-in-use yes" config option.
--
Tomasz Chmielewski
http://wpkg.org
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