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This test is motivated by an issue found in btrfs. It test that after syncing the filesystem, adding many xattrs to a file, syncing the filesystem again, writing to the file and then doing a fsync against that file, all the xattrs still exists after a power failure. That is, after the fsync log/journal is replayed, the xattrs still exist and with the correct values. The btrfs issue is fixed by the patch titled: "Btrfs: fix fsync xattr loss in the fast fsync path" Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Eryu Guan <eguan@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>