dm snapshot: trigger exceptions in remaining snapshots during merge

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When there is one merging snapshot and other non-merging snapshots,
snapshot_merge_process() must make exceptions in the non-merging
snapshots.

Use a sequence count to resolve the race between I/O to chunks that are
about to be merged.  The count increases each time an exception
reallocation finishes.  Use wait_event() to wait until the count
changes.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

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Mikulas Patocka 2009-12-10 23:52:34 +00:00 • committed by Alasdair G Kergon

parent 17aa03326d

commit 73dfd078cf

1 changed files with 83 additions and 0 deletions

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drivers/md/dm-snap.c

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