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| author | Mikulas Patocka <mpatocka@redhat.com> | 2009-12-11 00:51:59 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-12-11 00:51:59 +0100 |
| commit | b09acf1aa79462bdacfe6744b469a17722a52702 (patch) | |
| tree | 27ef83ed0d0bbf35938814f8ba3206e7881a170d /drivers/scsi | |
| parent | dm raid1: support flush (diff) | |
| download | linux-b09acf1aa79462bdacfe6744b469a17722a52702.tar.xz linux-b09acf1aa79462bdacfe6744b469a17722a52702.zip | |
dm raid1: split touched state into two
Split the variable "touched" into two, "touched_dirtied" and
"touched_cleaned", set when some region was dirtied or cleaned.
This will be used to optimize flushes.
After a transition from "dirty" to "clean" state we don't have flush hardware
cache on the log device. After a transition from "clean" to "dirty" the cache
must be flushed.
Before a transition from "clean" to "dirty" state we don't have to flush all
the raid legs. Before a transition from "dirty" to "clean" we must flush all
the legs to make sure that they are really in sync.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/scsi')
0 files changed, 0 insertions, 0 deletions