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scsi_scan: Restrict sequential scan to 256 LUNs

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Sequential scan for more than 256 LUNs is very fragile as
LUNs might not be numbered sequentially after that point.

SAM revisions later than SCSI-3 impose a structure on
LUNs larger than 256, making LUN numbers between 256
and 16384 illegal.
SCSI-3, however allows for plain 64-bit numbers with
no internal structure.

So restrict sequential LUN scan to 256 LUNs and add a
new blacklist flag 'BLIST_SCSI3LUN' to scan up to
max_lun devices.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Ewan Milne <emilne@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Hannes Reinecke 2014-06-03 10:58:53 +02:00 committed by Christoph Hellwig
parent c309b35171
commit 22ffeb48b7
2 changed files with 8 additions and 0 deletions
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6
drivers/scsi/scsi_scan.c
View File

@ -1234,6 +1234,12 @@ static void scsi_sequential_lun_scan(struct scsi_target *starget,
if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
max_dev_lun = min(8U, max_dev_lun);
/*
* Stop scanning at 255 unless BLIST_SCSI3LUN
*/
if (!(bflags & BLIST_SCSI3LUN))
max_dev_lun = min(256U, max_dev_lun);
/*
* We have already scanned LUN 0, so start at LUN 1. Keep scanning
* until we reach the max, or no LUN is found and we are not

2
include/scsi/scsi_devinfo.h
View File

@ -32,4 +32,6 @@
#define BLIST_ATTACH_PQ3 0x1000000 /* Scan: Attach to PQ3 devices */
#define BLIST_NO_DIF 0x2000000 /* Disable T10 PI (DIF) */
#define BLIST_SKIP_VPD_PAGES 0x4000000 /* Ignore SBC-3 VPD pages */
#define BLIST_SCSI3LUN 0x8000000 /* Scan more than 256 LUNs
for sequential scan */
#endif