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

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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>

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This commit is contained in:

Artur Paszkiewicz 2017-03-09 10:00:02 +01:00 • committed by Shaohua Li

parent 4536bf9ba2

commit 6358c239d8

3 changed files with 64 additions and 2 deletions

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9

drivers/md/raid5-log.h

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45

drivers/md/raid5-ppl.c

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12

drivers/md/raid5.c

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