[ck] Re: [ANCK-4.19 PATCH 1/9] fuse: add FOPEN_CACHE_DIR

From: Miklos Szeredi <mszeredi(a)redhat.com> commit 6433b8998a21dc597002731c4ceb4144e856edc4 upstream 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(a)redhat.com> Signed-off-by: Jeffle Xu <jefflexu(a)linux.alibaba.com>

--- include/uapi/linux/fuse.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h index 969dbd591e37..f008a61c5506 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 @@ -219,11 +222,13 @@ 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 * FOPEN_STREAM: the file is stream-like (no file position at all) */ #define FOPEN_DIRECT_IO (1 << 0) #define FOPEN_KEEP_CACHE (1 << 1) #define FOPEN_NONSEEKABLE (1 << 2) +#define FOPEN_CACHE_DIR (1 << 3) #define FOPEN_STREAM (1 << 4) /**