From a8196288de61cdcb19039141e700f35f63779739 Mon Sep 17 00:00:00 2001
From: David Disseldorp <ddiss@suse.de>
Date: Sat, 22 Aug 2015 15:30:33 +0200
Subject: [PATCH] rbd: add cmpsetattr device attribute for debugging
Patch-mainline: Not yet, SES2 clustered LIO/RBD
References: fate#318836
Signed-off-by: David Disseldorp <ddiss@suse.de>
---
drivers/block/rbd.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -4835,6 +4835,36 @@ static ssize_t rbd_setxattr_set(struct d
return size;
}
+static ssize_t rbd_cmpsetxattr_set(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
+ char key[RBD_MAX_XATTR_STR_LEN];
+ char oldval[RBD_MAX_XATTR_STR_LEN];
+ char newval[RBD_MAX_XATTR_STR_LEN];
+ int ret;
+
+ ret = sscanf(buf, "%" __stringify(RBD_MAX_XATTR_STR_LEN) "s %"
+ __stringify(RBD_MAX_XATTR_STR_LEN) "s %"
+ __stringify(RBD_MAX_XATTR_STR_LEN) "s\n",
+ key, oldval, newval);
+ if (ret != 3) {
+ rbd_warn(rbd_dev, "Invalid number of params. Got %d", ret);
+ return -EINVAL;
+ } else if (!strlen(key) || !strlen(oldval) || !strlen(newval)) {
+ rbd_warn(rbd_dev, "missing param");
+ return -EINVAL;
+ }
+
+ ret = rbd_dev_cmpsetxattr(rbd_dev, key, oldval, strlen(oldval) + 1,
+ newval, strlen(newval) + 1);
+ if (ret)
+ return ret;
+ else
+ return size;
+}
+
static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL);
static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL);
static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL);
@@ -4852,6 +4882,7 @@ static DEVICE_ATTR(current_snap, S_IRUGO
static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL);
static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL);
static DEVICE_ATTR(setxattr, S_IWUSR, NULL, rbd_setxattr_set);
+static DEVICE_ATTR(cmpsetxattr, S_IWUSR, NULL, rbd_cmpsetxattr_set);
static struct attribute *rbd_attrs[] = {
&dev_attr_size.attr,
@@ -4871,6 +4902,7 @@ static struct attribute *rbd_attrs[] = {
&dev_attr_parent.attr,
&dev_attr_refresh.attr,
&dev_attr_setxattr.attr,
+ &dev_attr_cmpsetxattr.attr,
NULL
};