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authorMikulas Patocka <mpatocka@redhat.com>2009-12-11 00:52:29 +0100
committerAlasdair G Kergon <agk@redhat.com>2009-12-11 00:52:29 +0100
commit4454a6216f75a9ef8c4bd0a65e34b101f725ef1e (patch)
tree25b97b629954702692397072dd6cd20f34221b5c /net/sched/sch_atm.c
parentdm snapshot: create function for chunk_is_tracked wait (diff)
downloadlinux-4454a6216f75a9ef8c4bd0a65e34b101f725ef1e.tar.xz
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dm exception store: add merge specific methods
Add functions that decide how many consecutive chunks of snapshot to merge back into the origin next and to update the metadata afterwards. prepare_merge provides a pointer to the most recent still-to-be-merged chunk and returns how many previous ones are consecutive and can be processed together. commit_merge removes the nr_merged most-recent chunks permanently from the exception store. The number must not exceed that returned by prepare_merge. Introduce NUM_SNAPSHOT_HDR_CHUNKS to show where the snapshot header chunk is accounted for. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Reviewed-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'net/sched/sch_atm.c')
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