[dm-devel] [PATCH 0/2] scsi: export busy state for request stacking drivers

[Kiyoshi Ueda <k-ueda ct jp nec com>]

Hi James,

The following patches export busy-status of SCSI LLD to request-based
dm-multipath for proper I/O scheduling.
The patches are created on the following commit of scsi-post-merge-2.6.
---------------------------------------------------------------
commit 454f40af9f0d4cda1c89e1fc0028d5235b150bc7
Author: Mike Christie <michaelc cs wisc edu>
Date:   Wed Sep 24 11:46:15 2008 -0500

    libiscsi: fix locking in iscsi_eh_device_reset
---------------------------------------------------------------

The changes from the previous version (*) is to check the busy state
everytime instead of using a cached flag inside scsi.

Summary of the patches:
  1/2: scsi: refactor sdev/starget/shost busy checking
  2/2: scsi: export busy state via q->lld_busy_fn()

Please review and apply.

Thanks,
Kiyoshi Ueda