On 12/21/20 10:49 PM, Naohiro Aota wrote:

btrfs_rmap_block currently reverse-maps the physical addresses on all
devices to the corresponding logical addresses.

This commit extends the function to match to a specified device. The old
functionality of querying all devices is left intact by specifying NULL as
target device.

We pass block_device instead of btrfs_device to __btrfs_rmap_block. This
function is intended to reverse-map the result of bio, which only have
block_device.

This commit also exports the function for later use.

Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>

Reviewed-by: Josef Bacik <josef@toxicpanda.com>

Thanks,

Josef