diff options
| author | Heinz Mauelshagen | 2015-04-29 14:03:04 +0200 |
|---|---|---|
| committer | Mike Snitzer | 2015-05-29 14:19:00 -0400 |
| commit | 0cf4503174c12025ac7ea61048cb7c1d4d1ed85c (patch) | |
| tree | 52b88a85b6bd98f5156ecd2c1e573e04fcb7c59a /Documentation/device-mapper | |
| parent | c76d53f43ec4f9b9f200f031d303f21bdf6927d0 (diff) | |
dm raid: add support for the MD RAID0 personality
Add dm-raid access to the MD RAID0 personality to enable single zone
striping.
The following changes enable that access:
- add type definition to raid_types array
- make bitmap creation conditonal in super_validate(), because
bitmaps are not allowed in raid0
- set rdev->sectors to the data image size in super_validate()
to allow the raid0 personality to calculate the MD array
size properly
- use mdddev(un)lock() functions instead of direct mutex_(un)lock()
(wrapped in here because it's a trivial change)
- enhance raid_status() to always report full sync for raid0
so that userspace checks for 100% sync will succeed and allow
for resize (and takeover/reshape once added in future paches)
- enhance raid_resume() to not load bitmap in case of raid0
- add merge function to avoid data corruption (seen with readahead)
that resulted from bio payloads that grew too large. This problem
did not occur with the other raid levels because it either did not
apply without striping (raid1) or was avoided via stripe caching.
- raise version to 1.7.0 because of the raid0 API change
Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Reviewed-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'Documentation/device-mapper')
| -rw-r--r-- | Documentation/device-mapper/dm-raid.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/device-mapper/dm-raid.txt b/Documentation/device-mapper/dm-raid.txt index 85b74b15fa9c..cb12af3b51c2 100644 --- a/Documentation/device-mapper/dm-raid.txt +++ b/Documentation/device-mapper/dm-raid.txt @@ -225,3 +225,4 @@ Version History 1.5.1 Add ability to restore transiently failed devices on resume. 1.5.2 'mismatch_cnt' is zero unless [last_]sync_action is "check". 1.6.0 Add discard support (and devices_handle_discard_safely module param). +1.7.0 Add support for MD RAID0 mappings. |