Jens Axboe wrote:
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.
ok will do.
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