Re: [PATCH] btrfs: start readahead also in seed devices

On Thu, Jun 06, 2019 at 04:54:44PM +0900, Naohiro Aota wrote:

Currently, btrfs does not consult seed devices to start readahead. As a result, if readahead zone is added to the seed devices, btrfs_reada_wait() indefinitely wait for the reada_ctl to finish.

You can reproduce the hung by modifying btrfs/163 to have larger initial file size (e.g. xfs_io pwrite 4M instead of current 256K).

Fixes: 7414a03fbf9e ("btrfs: initial readahead code and prototypes") Cc: stable@vger.kernel.org # 3.2+: ce7791ffee1e: Btrfs: fix race between readahead and device replace/removal Cc: stable@vger.kernel.org # 3.2+ Signed-off-by: Naohiro Aota naohiro.aota@wdc.com

Thanks, added to misc-next.