Add flag returned by OPENDIR request to allow kernel to cache directory
contents in page cache. The effect of FOPEN_CACHE_DIR is twofold:
a) if not already cached, it writes entries into the cache
b) if already cached, it allows reading entries from the cache
The FOPEN_KEEP_CACHE has the same effect as on regular files: unless this
flag is given the cache is cleared upon completion of open.
So FOPEN_KEEP_CACHE and FOPEN_KEEP_CACHE flags should be used together to
make use of the directory caching facility introduced in the following
patches.
The FUSE_AUTO_INVAL_DATA flag returned in INIT reply also has the same
affect on the directory cache as it has on data cache for regular files.
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
---
include/uapi/linux/fuse.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index 92fa24c24c92..e30e3a6868cd 100644
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -116,6 +116,9 @@
*
* 7.27
* - add FUSE_ABORT_ERROR
+ *
+ * 7.28
+ * - add FOPEN_CACHE_DIR
*/
#ifndef _LINUX_FUSE_H
@@ -151,7 +154,7 @@
#define FUSE_KERNEL_VERSION 7
/** Minor version number of this interface */
-#define FUSE_KERNEL_MINOR_VERSION 27
+#define FUSE_KERNEL_MINOR_VERSION 28
/** The node ID of the root inode */
#define FUSE_ROOT_ID 1
@@ -219,10 +222,12 @@ struct fuse_file_lock {
* FOPEN_DIRECT_IO: bypass page cache for this open file
* FOPEN_KEEP_CACHE: don't invalidate the data cache on open
* FOPEN_NONSEEKABLE: the file is not seekable
+ * FOPEN_CACHE_DIR: allow caching this directory
*/
#define FOPEN_DIRECT_IO (1 << 0)
#define FOPEN_KEEP_CACHE (1 << 1)
#define FOPEN_NONSEEKABLE (1 << 2)
+#define FOPEN_CACHE_DIR (1 << 3)
/**
* INIT request/reply flags
--
2.14.3
