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Description of problem:
At the moment blkdiscard is issuing a single ioctl with the entire chunk of block device to be discarded. This operation may take a long time (depending on the discard granularity of the device) and it is impossible to determine what is the status of completion and interrupt the process.

Managing software (such as oVirt) would like to use blkdiscard (instead of re-writing a similar tool) but they need progress report and the ability to interrupt the process if needed.


Version-Release number of selected component (if applicable):
util-linux-2.23.2-18.el7

Steps to Reproduce:
1. blkdiscard -v /dev/large/device


Actual results:
No progress report, process is uninterruptible until the entire device is discarded.

Expected results:
Progress should be reported and it should be possible to interrupt the process.


Additional info:
An initial work on the fix can be found here:

https://github.com/simon3z/util-linux/commit/4e5e19aa6788061eae52804622237dfe7d0c863f

Patches were posted upstream:

http://article.gmane.org/gmane.linux.utilities.util-linux-ng/10069
http://article.gmane.org/gmane.linux.utilities.util-linux-ng/10070
http://article.gmane.org/gmane.linux.utilities.util-linux-ng/10071

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-0501.html