orangefs: record userspace version for feature compatbility
The client reports its version to the kernel on startup. We already test
that it is above the minimum version. Now we record it in a global
variable so code elsewhere can consult it before making a request the
client may not understand.
Signed-off-by: Martin Brandenburg <martin@omnibond.com>
diff --git a/fs/orangefs/devorangefs-req.c b/fs/orangefs/devorangefs-req.c
index a287a66..7c40e65 100644
--- a/fs/orangefs/devorangefs-req.c
+++ b/fs/orangefs/devorangefs-req.c
@@ -17,6 +17,8 @@
/* this file implements the /dev/pvfs2-req device node */
+uint32_t userspace_version;
+
static int open_access_count;
#define DUMP_DEVICE_ERROR() \
@@ -387,6 +389,13 @@
return -EPROTO;
}
+ if (!userspace_version) {
+ userspace_version = head.version;
+ } else if (userspace_version != head.version) {
+ gossip_err("Error: userspace version changes\n");
+ return -EPROTO;
+ }
+
/* remove the op from the in progress hash table */
op = orangefs_devreq_remove_op(head.tag);
if (!op) {
@@ -527,6 +536,7 @@
gossip_debug(GOSSIP_DEV_DEBUG,
"pvfs2-client-core: device close complete\n");
open_access_count = 0;
+ userspace_version = 0;
mutex_unlock(&devreq_mutex);
return 0;
}
diff --git a/fs/orangefs/orangefs-kernel.h b/fs/orangefs/orangefs-kernel.h
index 633c07a..ff3566a 100644
--- a/fs/orangefs/orangefs-kernel.h
+++ b/fs/orangefs/orangefs-kernel.h
@@ -506,6 +506,8 @@
/*
* defined in devorangefs-req.c
*/
+extern uint32_t userspace_version;
+
int orangefs_dev_init(void);
void orangefs_dev_cleanup(void);
int is_daemon_in_service(void);