From 518fa8e39bafd2431c28adb8822bb6c3e4d1a390 Mon Sep 17 00:00:00 2001 From: "Martin K. Petersen" Date: Fri, 8 Oct 2010 01:36:24 -0400 Subject: [PATCH] [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: Martin K. Petersen Signed-off-by: James Bottomley --- drivers/scsi/sd.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 57d1e3e1bd44..b9ab3a590e4b 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -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,