tree d6257751445618b827c3e41e5b8fde2704c9d716
parent 5ed7959ede0936c55e50421a53f153b17080e876
author James Bottomley <James.Bottomley@HansenPartnership.com> 1200255328 -0600
committer Jens Axboe <jens.axboe@oracle.com> 1201514089 +0100

SG: work with the SCSI fixed maximum allocations.

SCSI sg table allocation has a maximum size (of SCSI_MAX_SG_SEGMENTS,
currently 128) and this will cause a BUG_ON() in SCSI if something
tries an allocation over it.  This patch adds a size limit to the
chaining allocator to allow the specification of the maximum
allocation size for chaining, so we always chain in units of the
maximum SCSI allocation size.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>