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[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 <martin.petersen@oracle.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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8c579ab69d
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1 changed files with 24 additions and 1 deletions
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@ -261,6 +261,28 @@ sd_show_protection_type(struct device *dev, struct device_attribute *attr,
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return snprintf(buf, 20, "%u\n", sdkp->protection_type);
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}
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static ssize_t
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sd_store_protection_type(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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unsigned int val;
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int err;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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err = kstrtouint(buf, 10, &val);
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if (err)
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return err;
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if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
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sdkp->protection_type = val;
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return count;
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}
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static ssize_t
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sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
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char *buf)
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@ -381,7 +403,8 @@ static struct device_attribute sd_disk_attrs[] = {
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sd_store_allow_restart),
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__ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
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sd_store_manage_start_stop),
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__ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
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__ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type,
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sd_store_protection_type),
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__ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
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__ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
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__ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
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