On Thu, Feb 16 2006, Mike Christie wrote: > Subject: [PATCH] block layer: add partial mappings support to bio_map_user > > For target mode we could end up with the case where we get very large > request from the initiator. The request could be so large that we > cannot transfer all the data in one operation. For example the > HBA's segment or max_sector limits might limit us to a 1 MB transfer. > To send a 5 MB command then we need to transfer the command chunk by chunk. > > To do this, tgt core will map in as much data as possible into a bio, > send this off, then when that transfer is completed we send off another > request/bio. To be able to pack as much data into a bio as possible > we need bio_map_user to support partially mapped bios. The attached patch > just adds a new argument to the those functions and if set will not > return a failure if the bio is partially mapped. Drop the partial flag and just always allow it, fixing up the few in-kernel users we have. -- Jens Axboe - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
