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scsi: add a blacklist flag which enables VPD page inquiries

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Despite supporting modern SCSI features some storage devices continue to
claim conformance to an older version of the SPC spec. This is done for
compatibility with legacy operating systems.

Linux by default will not attempt to read VPD pages on devices that
claim SPC-2 or older. Introduce a blacklist flag that can be used to
trigger VPD page inquiries on devices that are known to support them.

Reported-by: KY Srinivasan <kys@microsoft.com>
Tested-by: KY Srinivasan <kys@microsoft.com>
Reviewed-by: KY Srinivasan <kys@microsoft.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
CC: <stable@vger.kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Martin K. Petersen
2014-07-15 12:49:17 -04:00
committed by Christoph Hellwig
parent fd2eb9034e
commit c1d40a527e
4 changed files with 10 additions and 1 deletions
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5
drivers/scsi/sd.c
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@@ -2726,6 +2726,11 @@ static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
static int sd_try_extended_inquiry(struct scsi_device *sdp)
{
/* Attempt VPD inquiry if the device blacklist explicitly calls
* for it.
*/
if (sdp->try_vpd_pages)
return 1;
/*
* Although VPD inquiries can go to SCSI-2 type devices,
* some USB ones crash on receiving them, and the pages