tree 624a99ba683e1ee7115b2e0c5ac9845436524a09
parent 4536bf9ba2d03404655586b07f8830b6f2106242
author Artur Paszkiewicz <artur.paszkiewicz@intel.com> 1489050002 +0100
committer Shaohua Li <shli@fb.com> 1489708556 -0700

raid5-ppl: support disk hot add/remove with PPL

Add a function to modify the log by removing an rdev when a drive fails
or adding when a spare/replacement is activated as a raid member.

Removing a disk just clears the child log rdev pointer. No new stripes
will be accepted for this child log in ppl_write_stripe() and running io
units will be processed without writing PPL to the device.

Adding a disk sets the child log rdev pointer and writes an empty PPL
header.

Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>