orangefs: add features op
This is a new userspace operation, which will be done if the client-core
version is greater than or equal to 2.9.6. This will provide a way to
implement optional features and to determine which features are
supported by the client-core. If the client-core version is older than
2.9.6, no optional features are supported and the op will not be done.
The intent is to allow protocol extensions without relying on the
client-core's current behavior of ignoring what it doesn't understand.
Signed-off-by: Martin Brandenburg <martin@omnibond.com>
diff --git a/fs/orangefs/devorangefs-req.c b/fs/orangefs/devorangefs-req.c
index 7c40e65..ec1a5ff 100644
--- a/fs/orangefs/devorangefs-req.c
+++ b/fs/orangefs/devorangefs-req.c
@@ -17,7 +17,7 @@
/* this file implements the /dev/pvfs2-req device node */
-uint32_t userspace_version;
+uint32_t orangefs_userspace_version;
static int open_access_count;
@@ -389,9 +389,9 @@
return -EPROTO;
}
- if (!userspace_version) {
- userspace_version = head.version;
- } else if (userspace_version != head.version) {
+ if (!orangefs_userspace_version) {
+ orangefs_userspace_version = head.version;
+ } else if (orangefs_userspace_version != head.version) {
gossip_err("Error: userspace version changes\n");
return -EPROTO;
}
@@ -536,7 +536,7 @@
gossip_debug(GOSSIP_DEV_DEBUG,
"pvfs2-client-core: device close complete\n");
open_access_count = 0;
- userspace_version = 0;
+ orangefs_userspace_version = 0;
mutex_unlock(&devreq_mutex);
return 0;
}