Btrfs: add datacow flag in inode flag
For datacow control, the corresponding inode flags are needed. This is for btrfs use. v1->v2: Change FS_COW_FL to another bit due to conflict with the upstream e2fsprogs Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
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