fuse: make the number of max background requests and congestion threshold tunable

The practical values for these limits depend on the design of the
filesystem server so let userspace set them at initialization time.

Signed-off-by: Csaba Henk <csaba@gluster.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

1 files changed, 7 insertions, 2 deletions

diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index cf593bf9fd32..b3700f0ac268 100644
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -30,6 +30,10 @@
  *  - add umask flag to input argument of open, mknod and mkdir
  *  - add notification messages for invalidation of inodes and
  *    directory entries
+ *
+ * 7.13
+ *  - make max number of background requests and congestion threshold
+ *    tunables
  */
 
 #ifndef _LINUX_FUSE_H
@@ -41,7 +45,7 @@
 #define FUSE_KERNEL_VERSION 7
 
 /** Minor version number of this interface */
-#define FUSE_KERNEL_MINOR_VERSION 12
+#define FUSE_KERNEL_MINOR_VERSION 13
 
 /** The node ID of the root inode */
 #define FUSE_ROOT_ID 1
@@ -427,7 +431,8 @@ struct fuse_init_out {
         __u32   minor;
         __u32   max_readahead;
         __u32   flags;
-        __u32   unused;
+        __u16   max_background;
+        __u16   congestion_threshold;
         __u32   max_write;
 };