[PATCH] dm snapshot: fix kcopyd destructor
authorAlasdair G Kergon <agk@redhat.com>
Mon, 27 Mar 2006 09:17:50 +0000 (01:17 -0800)
committerLinus Torvalds <torvalds@g5.osdl.org>
Mon, 27 Mar 2006 16:44:59 +0000 (08:44 -0800)
commit138728dc96529f20dfe970c470e51885a60e329f
treea0369a9de402cd8b9a123129c5e8ba7c69ba1a95
parent969429b504ae866d3f8b1cafd68a2c099e305093
[PATCH] dm snapshot: fix kcopyd destructor

Before removing a snapshot, wait for the completion of any kcopyd jobs using
it.

Do this by maintaining a count (nr_jobs) of how many outstanding jobs each
kcopyd_client has.

The snapshot destructor first unregisters the snapshot so that no new kcopyd
jobs (created by writes to the origin) will reference that particular
snapshot.  kcopyd_client_destroy() is now run next to wait for the completion
of any outstanding jobs before the snapshot exception structures (that those
jobs reference) are freed.

Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
drivers/md/dm-snap.c
drivers/md/kcopyd.c