[PATCH] fuse: more flexible caching

Make data caching behavior selectable on a per-open basis instead of
per-mount.  Compatibility for the old mount options 'kernel_cache' and
'direct_io' is retained in the userspace library (version 2.4.0-pre1 or
later).

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 10 insertions, 1 deletions

diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index cdfaa51b9018..c65124a213a1 100644
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -14,7 +14,7 @@
 #define FUSE_KERNEL_VERSION 7
 
 /** Minor version number of this interface */
-#define FUSE_KERNEL_MINOR_VERSION 1
+#define FUSE_KERNEL_MINOR_VERSION 2
 
 /** The node ID of the root inode */
 #define FUSE_ROOT_ID 1
@@ -63,6 +63,15 @@ struct fuse_kstatfs {
 #define FATTR_MTIME     (1 << 5)
 #define FATTR_CTIME     (1 << 6)
 
+/**
+ * Flags returned by the OPEN request
+ *
+ * FOPEN_DIRECT_IO: bypass page cache for this open file
+ * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
+ */
+#define FOPEN_DIRECT_IO         (1 << 0)
+#define FOPEN_KEEP_CACHE        (1 << 1)
+
 enum fuse_opcode {
         FUSE_LOOKUP        = 1,
         FUSE_FORGET        = 2,  /* no reply */