On Tue, Sep 11, 2012 at 10:33:50PM +0800, Liu Bo wrote: > Users report a bug, the reproducer is: > $ mkfs.btrfs /dev/loop0 > $ mount /dev/loop0 /mnt/btrfs/ > $ mkdir /mnt/btrfs/dir > $ chattr +C /mnt/btrfs/dir/ > $ dd if=/dev/zero of=/mnt/btrfs/dir/foo bs=4K count=10; > $ lsattr /mnt/btrfs/dir/foo > ---------------C- /mnt/btrfs/dir/foo > $ filefrag /mnt/btrfs/dir/foo > /mnt/btrfs/dir/foo: 1 extent found ---> an extent > $ dd if=/dev/zero of=/mnt/btrfs/dir/foo bs=4K count=1 seek=5 > conv=notrunc,nocreat; sync > $ filefrag /mnt/btrfs/dir/foo > /mnt/btrfs/dir/foo: 3 extents found ---> with nocow, btrfs breaks the > extent into three parts > > The new created file should not only inherit the NODATACOW flag, but also > honor NODATASUM flag, because we must do COW on a file extent with checksum. > > Signed-off-by: Liu Bo <bo.li....@oracle.com>
Reviewed-by: David Sterba <dste...@suse.cz> -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
