[Merge] lp:~stgraber/ubuntu/trusty/initramfs-tools-ubuntu-touch/enable-discard into lp:ubuntu/initramfs-tools-ubuntu-touch

[Stéphane Graber]

Stéphane Graber has proposed merging lp:~stgraber/ubuntu/trusty/initramfs-tools-ubuntu-touch/enable-discard into lp:ubuntu/initramfs-tools-ubuntu-touch.

Requested reviews:
  Ubuntu branches (ubuntu-branches)

For more details, see:
https://code.launchpad.net/~stgraber/ubuntu/trusty/initramfs-tools-ubuntu-touch/enable-discard/+merge/198998

Adds discard (TRIM) support when mounting the main writable block device (userdata).

This has been confirmed to work (device still boots fine) on mako and grouper. The way the flag works in the kernel, it should be fine on any device, if the underlying block device doesn't support it, it'll simply be ignored.

I'm not setting this flag for any of the loop mounted partitions because those are typically read-only anyway (so nothing to TRIM) and support of TRIM on ext2 loop-mounted over ext4 isn't particularly clear.
-- 
https://code.launchpad.net/~stgraber/ubuntu/trusty/initramfs-tools-ubuntu-touch/enable-discard/+merge/198998
Your team Ubuntu branches is requested to review the proposed merge of lp:~stgraber/ubuntu/trusty/initramfs-tools-ubuntu-touch/enable-discard into lp:ubuntu/initramfs-tools-ubuntu-touch.
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