linux-kernel - [PATCH 4.2.y-ckt 26/70] sd: Fix excessive capacity printing on devices with blocks bigger than 512 bytes

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Message-Id: <1460494375-30070-27-git-send-email-kamal@canonical.com>
Date:	Tue, 12 Apr 2016 13:52:11 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	"Martin K . Petersen" <martin.petersen@...cle.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 26/70] sd: Fix excessive capacity printing on devices with blocks bigger than 512 bytes

4.2.8-ckt8 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: "Martin K. Petersen" <martin.petersen@...cle.com>

commit f08bb1e0dbdd0297258d0b8cd4dbfcc057e57b2a upstream.

During revalidate we check whether device capacity has changed before we
decide whether to output disk information or not.

The check for old capacity failed to take into account that we scaled
sdkp->capacity based on the reported logical block size. And therefore
the capacity test would always fail for devices with sectors bigger than
512 bytes and we would print several copies of the same discovery
information.

Avoid scaling sdkp->capacity and instead adjust the value on the fly
when setting the block device capacity and generating fake C/H/S
geometry.

Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Reported-by: Hannes Reinecke <hare@...e.de>
Reviewed-by: Hannes Reinicke <hare@...e.de>
Reviewed-by: Ewan Milne <emilne@...hat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/scsi/sd.c | 23 ++++++++---------------
 drivers/scsi/sd.h |  7 ++++++-
 2 files changed, 14 insertions(+), 16 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 441ae2b..ac91a62 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1260,18 +1260,19 @@ static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 	struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
 	struct scsi_device *sdp = sdkp->device;
 	struct Scsi_Host *host = sdp->host;
+	sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
 	int diskinfo[4];
 
 	/* default to most commonly used values */
-        diskinfo[0] = 0x40;	/* 1 << 6 */
-       	diskinfo[1] = 0x20;	/* 1 << 5 */
-       	diskinfo[2] = sdkp->capacity >> 11;
-	
+	diskinfo[0] = 0x40;	/* 1 << 6 */
+	diskinfo[1] = 0x20;	/* 1 << 5 */
+	diskinfo[2] = capacity >> 11;
+
 	/* override with calculated, extended default, or driver values */
 	if (host->hostt->bios_param)
-		host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
+		host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
 	else
-		scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
+		scsicam_bios_param(bdev, capacity, diskinfo);
 
 	geo->heads = diskinfo[0];
 	geo->sectors = diskinfo[1];
@@ -2230,14 +2231,6 @@ got_data:
 	} else
 		sdkp->max_xfer_blocks = SD_DEF_XFER_BLOCKS;
 
-	/* Rescale capacity to 512-byte units */
-	if (sector_size == 4096)
-		sdkp->capacity <<= 3;
-	else if (sector_size == 2048)
-		sdkp->capacity <<= 2;
-	else if (sector_size == 1024)
-		sdkp->capacity <<= 1;
-
 	blk_queue_physical_block_size(sdp->request_queue,
 				      sdkp->physical_block_size);
 	sdkp->device->sector_size = sector_size;
@@ -2773,7 +2766,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
 	sdkp->disk->queue->limits.max_sectors =
 		min_not_zero(queue_max_hw_sectors(sdkp->disk->queue), max_xfer);
 
-	set_capacity(disk, sdkp->capacity);
+	set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
 	sd_config_write_same(sdkp);
 	kfree(buffer);
 
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index 63ba5ca..0264936 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -65,7 +65,7 @@ struct scsi_disk {
 	struct device	dev;
 	struct gendisk	*disk;
 	atomic_t	openers;
-	sector_t	capacity;	/* size in 512-byte sectors */
+	sector_t	capacity;	/* size in logical blocks */
 	u32		max_xfer_blocks;
 	u32		max_ws_blocks;
 	u32		max_unmap_blocks;
@@ -145,6 +145,11 @@ static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
 	return 0;
 }
 
+static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blocks)
+{
+	return blocks << (ilog2(sdev->sector_size) - 9);
+}
+
 /*
  * A DIF-capable target device can be formatted with different
  * protection schemes.  Currently 0 through 3 are defined:
-- 
2.7.4