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(parent: 85fe0b3) | patch
dm snapshot: lock snapshot while supplying status
authorMikulas Patocka <mpatocka@redhat.com>
Fri, 16 Oct 2009 22:18:16 +0000 (23:18 +0100)
committerAlasdair G Kergon <agk@redhat.com>
Fri, 16 Oct 2009 22:18:16 +0000 (23:18 +0100)
commit239dc4d6742f43bb533d7ecd6c13119121022e22
tree56ac3d262699fe5a42f76fe9f992277a6a7a2934tree | snapshot
parent85fe0b34bc36b94123b249955923c7a019381990commit | diff
dm snapshot: lock snapshot while supplying status

This patch locks the snapshot when returning status.  It fixes a race
when it could return an invalid number of free chunks if someone
was simultaneously modifying it.

Cc: stable@kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
drivers/md/dm-snap.c diff | blob | history
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