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Commit 518fa8e3 authored by Martin K. Petersen's avatar Martin K. Petersen Committed by James Bottomley
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[SCSI] sd: Export effective protection mode in sysfs 



Create a sysfs entry that reports the negotiated DIX/DIF protection mode
for a SCSI disk. This depends on the protection type the disk is
formatted with as well as the protection capabilities advertised by the
controller.

Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
parent 349ed5a0

drivers/scsi/sd.c

+23 −0
Original line number Diff line number Diff line
@@ -258,6 +258,28 @@ sd_show_protection_type(struct device *dev, struct device_attribute *attr, 
	return snprintf(buf, 20, "%u\n", sdkp->protection_type);

}



static ssize_t

sd_show_protection_mode(struct device *dev, struct device_attribute *attr,

			char *buf)

{

	struct scsi_disk *sdkp = to_scsi_disk(dev);

	struct scsi_device *sdp = sdkp->device;

	unsigned int dif, dix;



	dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);

	dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);



	if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {

		dif = 0;

		dix = 1;

	}



	if (!dif && !dix)

		return snprintf(buf, 20, "none\n");



	return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);

}



static ssize_t

sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,

		    char *buf)
@@ -285,6 +307,7 @@ static struct device_attribute sd_disk_attrs[] = { 
	__ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,

	       sd_store_manage_start_stop),

	__ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),

	__ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),

	__ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),

	__ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),

	__ATTR_NULL,