lkml.org 
[lkml]   [2016]   [Apr]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Date
Subject[PATCH 3.2 067/115] sd: Fix excessive capacity printing on devices with blocks bigger than 512 bytes
3.2.80-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: "Martin K. Petersen" <martin.petersen@oracle.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@oracle.com>
Reported-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Hannes Reinicke <hare@suse.de>
Reviewed-by: Ewan Milne <emilne@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
[bwh: Backported to 3.2:
- logical_to_sectors() is a new function
- Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1051,18 +1051,19 @@ static int sd_getgeo(struct block_device
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];
@@ -1931,14 +1932,6 @@ got_data:
}
}

- /* 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;
@@ -2416,7 +2409,7 @@ static int sd_revalidate_disk(struct gen

blk_queue_flush(sdkp->disk->queue, flush);

- set_capacity(disk, sdkp->capacity);
+ set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
kfree(buffer);

out:
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -52,7 +52,7 @@ 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_ws_blocks;
u32 max_unmap_blocks;
u32 unmap_granularity;
@@ -89,6 +89,11 @@ static inline struct scsi_disk *scsi_dis
(sdsk)->disk->disk_name, ##a) : \
sdev_printk(prefix, (sdsk)->device, fmt, ##a)

+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:
\
 
 \ /
  Last update: 2016-04-27 02:01    [W:0.460 / U:1.368 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site