| commit | 73dfd078cf8bfee4018fb22f1e2a24f2e05b69dc | |
| author | Mikulas Patocka <mpatocka@redhat.com> | |
| Thu, 10 Dec 2009 23:52:34 +0000 (10 23:52 +0000) | ||
| committer | Alasdair G Kergon <agk@redhat.com> | |
| Thu, 10 Dec 2009 23:52:34 +0000 (10 23:52 +0000) | ||
| tree | e5cc81262315df5c44d13d5a2eb731cfe7f8ea86 | treesnapshot (tar.gz zip) |
| parent | 17aa03326d40614db94bc51fbbc92df628a5c97c | commitdiff |
dm snapshot: trigger exceptions in remaining snapshots during merge
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>
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>
| drivers/md/dm-snap.c | diffblobblamehistory |