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Qu Wenruo
083ff5827b
For fs support reflink, some of them (OK, btrfs again) doesn't split
SHARED flag for extent fiemap reporting.
For example:
0 4K 8K
/ File1: Extent 0 \
/ \
|<- On disk Extent-->|
| /
| File2 /
Extent: 0
Fs supports explicit SHARED extent reporting should report fiemap like:
File1: 2 extents
Extent 0-4K: SHARED
Extent 4-8K:
File2: 1 extents
Extent 0-4K: SHARED
Fs doesn't support explicit reporting will report fiemap like:
File1: 1 extent
Extent 0-8K: SHARED
File2: 1 extent
Extent 0-4K: SHARED
Test case like generic/372 require explicit reporting will cause
false alert on btrfs.
Add such runtime check for that requirememt.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>