From: Martin K. Petersen Date: Thu, 28 Sep 2017 01:35:12 +0000 (-0400) Subject: scsi: sd: Implement blacklist option for WRITE SAME w/ UNMAP X-Git-Tag: v3.2.97~58 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a75a0b71bc065dc42701e7708a8e6b368ea01864;p=thirdparty%2Fkernel%2Fstable.git 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 Reported-by: Ewan D. Milne Reviewed-by: Ewan D. Milne Tested-by: Laurence Oberman Signed-off-by: Martin K. Petersen [bwh: Backported to 3.2: - Keep using literals for SD_MAX_WS{16,10}_BLOCKS - Adjust context] Signed-off-by: Ben Hutchings --- diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 5d207f1aca7a4..8d640eb8b287a 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -957,6 +957,9 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, if (*bflags & BLIST_RETRY_HWERROR) sdev->retry_hwerror = 1; + if (*bflags & BLIST_UNMAP_LIMIT_WS) + sdev->unmap_limit_for_ws = 1; + transport_configure_device(&sdev->sdev_gendev); if (sdev->host->hostt->slave_configure) { diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 6cbe2eb5326d0..ff16bc3057cd7 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -523,11 +523,21 @@ static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode) break; case SD_LBP_WS16: - max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff); + if (sdkp->device->unmap_limit_for_ws) + max_blocks = sdkp->max_unmap_blocks; + else + max_blocks = sdkp->max_ws_blocks; + + max_blocks = min_not_zero(max_blocks, 0xffffffff); break; case SD_LBP_WS10: - max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff); + if (sdkp->device->unmap_limit_for_ws) + max_blocks = sdkp->max_unmap_blocks; + else + max_blocks = sdkp->max_ws_blocks; + + max_blocks = min_not_zero(max_blocks, (u32)0xffff); break; case SD_LBP_ZERO: diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index 377ba61cf2291..4f768ae2185f9 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -152,6 +152,7 @@ struct scsi_device { unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */ unsigned is_visible:1; /* is the device visible in sysfs */ unsigned broken_fua:1; /* Don't set FUA bit */ + unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ struct list_head event_list; /* asserted events */ diff --git a/include/scsi/scsi_devinfo.h b/include/scsi/scsi_devinfo.h index b4ddd3b18b4c1..f25ba760c2230 100644 --- a/include/scsi/scsi_devinfo.h +++ b/include/scsi/scsi_devinfo.h @@ -30,4 +30,5 @@ #define BLIST_RETRY_HWERROR 0x400000 /* retry HARDWARE_ERROR */ #define BLIST_MAX_512 0x800000 /* maximum 512 sector cdb length */ #define BLIST_ATTACH_PQ3 0x1000000 /* Scan: Attach to PQ3 devices */ +#define BLIST_UNMAP_LIMIT_WS 0x80000000 /* Use UNMAP limit for WRITE SAME */ #endif