From 8172499aae4d375334cfe6361900929c3b31a03f Mon Sep 17 00:00:00 2001 From: "Martin K. Petersen" Date: Tue, 28 Aug 2012 14:29:34 -0400 Subject: [PATCH] [SCSI] sd: Allow protection_type to be overridden We have encountered a few devices that misbehaved when operating in T10 PI mode. Allow T10 PI protection type to be overridden from userland. Signed-off-by: Martin K. Petersen Signed-off-by: James Bottomley --- drivers/scsi/sd.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 9f7fc39891b8..e04c302fa4f7 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -261,6 +261,28 @@ sd_show_protection_type(struct device *dev, struct device_attribute *attr, return snprintf(buf, 20, "%u\n", sdkp->protection_type); } +static ssize_t +sd_store_protection_type(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + unsigned int val; + int err; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + err = kstrtouint(buf, 10, &val); + + if (err) + return err; + + if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION) + sdkp->protection_type = val; + + return count; +} + static ssize_t sd_show_protection_mode(struct device *dev, struct device_attribute *attr, char *buf) @@ -381,7 +403,8 @@ static struct device_attribute sd_disk_attrs[] = { sd_store_allow_restart), __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_type, S_IRUGO|S_IWUSR, sd_show_protection_type, + sd_store_protection_type), __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), -- 2.20.1