Bugzilla – Bug 7060
mount+alter needs locking
Last modified: 2010-06-19 15:58:40
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If too many VMs are being started on the same machine at the same time, you can run into this: ioctl: LOOP_SET_FD: Device or resource busy Putting an flock in place fixes this. Also, the flock file descriptor redirection part here needs ">>" and not ">" because of "set -C" (thankyou Pierre). Otherwise you will get: "/var/lock/nimbus.mountalter.lock: cannot overwrite existing file"
Committed to master for 2.5 http://github.com/nimbusproject/nimbus/commit/ad454f9f1f15c89dc2af4ce8fbf247c45e7b80ad
Just for reference, apparently any way about it the losetup or mount commands both exihibit a race condition on the loop device selection. So flock at a higher level is the only way to go for us.
