From: Martin K. Petersen Date: Wed, 13 Jun 2012 04:12:35 +0000 (-0400) Subject: sd: Allow protection_type to be overridden X-Git-Tag: v2.6.39-400.9.0~516^2~18^2~3 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=620a6b35942c32f29d1c7e6dd810684efeb46536;p=users%2Fjedix%2Flinux-maple.git 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 --- diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 1a903b09496a2..ba5b9147c628f 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -258,6 +258,24 @@ 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 long val; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + val = simple_strtoul(buf, NULL, 10); + + 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) @@ -353,7 +371,8 @@ 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),