md/raid5: consider updating reshape_position at start of reshape.

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md/raid5 only updates ->reshape_position (which is stored in
metadata and is authoritative) occasionally, but particularly
when getting closed to ->resync_max as it must be correct
when ->resync_max is reached.

When mdadm tries to stop an array which is reshaping it will:
 - freeze the reshape,
 - set resync_max to where the reshape has reached.
 - unfreeze the reshape.
When this happens, the reshape is aborted and then restarted.

The restart doesn't check that resync_max is close, and so doesn't
update ->reshape_position like it should.
This results in the reshape stopping, but ->reshape_position being
incorrect.

So on that first call to reshape_request, make sure ->reshape_position
is updated if needed.

Signed-off-by: NeilBrown <neilb@suse.com>

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This commit is contained in:

NeilBrown 2015-07-06 12:28:45 +10:00

parent 985ca973b6

commit 92140480ed

1 changed files with 6 additions and 2 deletions

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drivers/md/raid5.c

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