Hello, Set of patches that follow this email facilitate movement of hardware handlers from dm layer to SCSI layer. Previous set of patches that implemented this was posted on Jan 24: http://marc.info/?l=linux-scsi&m=120113462706925&w=2 Changes have been made based on feedback received from James, Alasdair, Mike Christie and Mike Anderson. Following are the changes: - Removed scsi_dh hardware handler in the dm layer. This means no change (not even a change in the multipath.conf file) is required in user space. - Replaced REQ_OP_LB_TRANSITION with an activate() function. - Removed the SDEV_PASSIVE and added a prep_fn to the device handler, hence giving it the veto power. - Replaced blk_execute_rq_nowait() with blk_execute_rq() in device handlers to make them synchronous. Added a thread(work queue) to dm-multipath to handle requests asynchronously. - Added Ed's changes to the EMC hardware handler. Patches are created on top of 2.6.25-rc2-mm1. Testing has been done with a IBM DS4800 storage device, which means the infrastructure and the lsi_rdac hardware handler has been tested. Testing by someone with the EMC hardware and/or HP hardware would be appreciated. Comments, suggestions solicited. Thanks, chandra -- ---------------------------------------------------------------------- Chandra Seetharaman | Be careful what you choose.... - sekharan@xxxxxxxxxx | .......you may get it. ---------------------------------------------------------------------- -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
