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authorMartin K. Petersen <martin.petersen@oracle.com>2014-06-03 18:45:51 -0400
committerChristoph Hellwig <hch@lst.de>2014-07-17 22:07:33 +0200
commitbcdb247c6b6a1f3e72b9b787b73f47dd509d17ec (patch)
tree00131e8131aaeb1a94c61556dfb87ded905dd5e3 /include/scsi
parent8d964478b2d124fcfde8017d02d4d70ae20802f2 (diff)
sd: Limit transfer length
Until now the per-command transfer length has exclusively been gated by the max_sectors parameter in the scsi_host template. Given that the size of this parameter has been bumped to an unsigned int we have to be careful not to exceed the target device's capabilities. If the if the device specifies a Maximum Transfer Length in the Block Limits VPD we'll use that value. Otherwise we'll use 0xffffffff for devices that have use_16_for_rw set and 0xffff for the rest. We then combine the chosen disk limit with max_sectors in the host template. The smaller of the two will be used to set the max_hw_sectors queue limit. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Ewan D. Milne <emilne@redhat.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
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