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dm snapshot: test chunk size against both origin and snapshot

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Validate chunk size against both origin and snapshot sector size

Don't allow chunk size smaller than either origin or snapshot logical
sector size. Reading or writing data not aligned to sector size is not
allowed and causes immediate errors.

This requires us to open the origin before initialising the
exception store and to export dm_snap_origin.

Cc: stable@kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka
2010-08-12 04:13:51 +01:00
committed by Alasdair G Kergon
parent 1e5554c842
commit c241104506
3 changed files with 26 additions and 17 deletions
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3
drivers/md/dm-exception-store.h
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@@ -126,8 +126,9 @@ struct dm_exception_store {
};
/*
* Obtain the cow device used by a given snapshot.
* Obtain the origin or cow device used by a given snapshot.
*/
struct dm_dev *dm_snap_origin(struct dm_snapshot *snap);
struct dm_dev *dm_snap_cow(struct dm_snapshot *snap);
/*