Btrfs: btrfs_submit_direct_hook: Handle map_length < bio vector length
In subpagesize-blocksize scenario, map_length can be less than the length of a bio vector. Such a condition may cause btrfs_submit_direct_hook() to submit a zero length bio. Fix this by comparing map_length against block size rather than with bv_len. Signed-off-by: NChandan Rajendra <chandan@linux.vnet.ibm.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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