diff options
| author | Martin K. Petersen <martin.petersen@oracle.com> | 2017-09-27 21:35:12 -0400 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2018-01-01 20:51:47 +0000 |
| commit | 5a6034651e89c8fa92617efa24e0070dab3daaf0 (patch) | |
| tree | 604cdf69ba46d7538ceb28639f0662a07cf38d20 /include | |
| parent | 476f50e79bb58f010c65001526b92e1f833e4862 (diff) | |
scsi: sd: Implement blacklist option for WRITE SAME w/ UNMAP
commit 28a0bc4120d38a394499382ba21d6965a67a3703 upstream.
SBC-4 states:
"A MAXIMUM UNMAP LBA COUNT field set to a non-zero value indicates the
maximum number of LBAs that may be unmapped by an UNMAP command"
"A MAXIMUM WRITE SAME LENGTH field set to a non-zero value indicates
the maximum number of contiguous logical blocks that the device server
allows to be unmapped or written in a single WRITE SAME command."
Despite the spec being clear on the topic, some devices incorrectly
expect WRITE SAME commands with the UNMAP bit set to be limited to the
value reported in MAXIMUM UNMAP LBA COUNT in the Block Limits VPD.
Implement a blacklist option that can be used to accommodate devices
with this behavior.
Reported-by: Bill Kuzeja <William.Kuzeja@stratus.com>
Reported-by: Ewan D. Milne <emilne@redhat.com>
Reviewed-by: Ewan D. Milne <emilne@redhat.com>
Tested-by: Laurence Oberman <loberman@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'include')
| -rw-r--r-- | include/scsi/scsi_device.h | 1 | ||||
| -rw-r--r-- | include/scsi/scsi_devinfo.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index 6868a5ca183c..ab5bfaa8f9de 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -175,6 +175,7 @@ struct scsi_device { unsigned wce_default_on:1; /* Cache is ON by default */ unsigned no_dif:1; /* T10 PI (DIF) should be disabled */ unsigned broken_fua:1; /* Don't set FUA bit */ + unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ atomic_t disk_events_disable_depth; /* disable depth for disk events */ diff --git a/include/scsi/scsi_devinfo.h b/include/scsi/scsi_devinfo.h index 96e3f56519e7..b29faa3471ed 100644 --- a/include/scsi/scsi_devinfo.h +++ b/include/scsi/scsi_devinfo.h @@ -37,5 +37,6 @@ #define BLIST_TRY_VPD_PAGES 0x10000000 /* Attempt to read VPD pages */ #define BLIST_NO_RSOC 0x20000000 /* don't try to issue RSOC */ #define BLIST_MAX_1024 0x40000000 /* maximum 1024 sector cdb length */ +#define BLIST_UNMAP_LIMIT_WS 0x80000000 /* Use UNMAP limit for WRITE SAME */ #endif |