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| H A D | dm.c | diff 2ca3310e78912a527d7d2c62c01da7cbf7346b8d Thu Jul 28 23:16:00 CDT 2005 Alasdair G Kergon <agk@redhat.com> [PATCH] device-mapper: fix md->lock deadlocks in core
This patch is an attempt to fix deadlocks discovered in the core dm.
The problems boil down to md->lock having to be held in too many places, so
I've split it into two: md->suspend_lock and md->io_lock.
suspend_lock is now held throughout dm_suspended() as well as dm_resume()
and dm_swap_table() so that these functions cannot run concurrently:
there's no requirement for that and it added complexity.
DMF_FS_LOCKED becomes redundant: DMF_SUSPENDED provides adequate
protection.
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>
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