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[SCSI] sd: Ensure we correctly disable devices with unknown protection type 

We set the capacity to zero when we discovered a device formatted with
an unknown DIF protection type. However, the read_capacity code would
override the capacity and cause the device to be enabled regardless.

Make sd_read_protection_type() return an error if the protection type is
unknown. Also prevent duplicate printk lines when the device is being
revalidated.

Reported-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Martin K. Petersen 2012-09-21 12:44:12 -04:00 committed by James Bottomley
parent fe0c9610bb
commit fe542396da
2 changed files with 37 additions and 19 deletions
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50
drivers/scsi/sd.c
View File

@ -1693,34 +1693,42 @@ sd_spinup_disk(struct scsi_disk *sdkp)
/*
* Determine whether disk supports Data Integrity Field.
*/
static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
{
struct scsi_device *sdp = sdkp->device;
u8 type;
int ret = 0;
if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
return;
return ret;
type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
if (type == sdkp->protection_type || !sdkp->first_scan)
return;
if (type > SD_DIF_TYPE3_PROTECTION)
ret = -ENODEV;
else if (scsi_host_dif_capable(sdp->host, type))
ret = 1;
if (sdkp->first_scan || type != sdkp->protection_type)
switch (ret) {
case -ENODEV:
sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
" protection type %u. Disabling disk!\n",
type);
break;
case 1:
sd_printk(KERN_NOTICE, sdkp,
"Enabling DIF Type %u protection\n", type);
break;
case 0:
sd_printk(KERN_NOTICE, sdkp,
"Disabling DIF Type %u protection\n", type);
break;
}
sdkp->protection_type = type;
if (type > SD_DIF_TYPE3_PROTECTION) {
sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
"protection type %u. Disabling disk!\n", type);
sdkp->capacity = 0;
return;
}
if (scsi_host_dif_capable(sdp->host, type))
sd_printk(KERN_NOTICE, sdkp,
"Enabling DIF Type %u protection\n", type);
else
sd_printk(KERN_NOTICE, sdkp,
"Disabling DIF Type %u protection\n", type);
return ret;
}
static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
@ -1816,7 +1824,10 @@ static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
sector_size = get_unaligned_be32(&buffer[8]);
lba = get_unaligned_be64(&buffer[0]);
sd_read_protection_type(sdkp, buffer);
if (sd_read_protection_type(sdkp, buffer) < 0) {
sdkp->capacity = 0;
return -ENODEV;
}
if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
@ -2654,7 +2665,8 @@ static void sd_probe_async(void *data, async_cookie_t cookie)
}
add_disk(gd);
sd_dif_config_host(sdkp);
if (sdkp->capacity)
sd_dif_config_host(sdkp);
sd_revalidate_disk(gd);

6
include/scsi/scsi_host.h
View File

@ -873,6 +873,9 @@ static inline unsigned int scsi_host_dif_capable(struct Scsi_Host *shost, unsign
SHOST_DIF_TYPE2_PROTECTION,
SHOST_DIF_TYPE3_PROTECTION };
if (target_type > SHOST_DIF_TYPE3_PROTECTION)
return 0;
return shost->prot_capabilities & cap[target_type] ? target_type : 0;
}
@ -884,6 +887,9 @@ static inline unsigned int scsi_host_dix_capable(struct Scsi_Host *shost, unsign
SHOST_DIX_TYPE2_PROTECTION,
SHOST_DIX_TYPE3_PROTECTION };
if (target_type > SHOST_DIX_TYPE3_PROTECTION)
return 0;
return shost->prot_capabilities & cap[target_type];
#endif
return 0;