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 a287a66d94e35189c2f7e226570e76d6e24f5925..7c40e653e526ca8d20165822c627c57ef6415c5c 100644 (file)
--- 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 @@ static ssize_t orangefs_devreq_write_iter(struct kiocb *iocb,
                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 @@ static int orangefs_devreq_release(struct inode *inode, struct file *file)
        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 633c07a6e3d80530b585c957edc6d5eeae70d042..ff3566a8388f4c54a1ce45752aebdeeaac9ffded 100644 (file)
--- a/fs/orangefs/orangefs-kernel.h
+++ b/fs/orangefs/orangefs-kernel.h
@@ -506,6 +506,8 @@ ssize_t orangefs_inode_read(struct inode *inode,
 /*
  * 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);