From fabf7e0262d0bd57739d29aeac94c44b0542ff1f Mon Sep 17 00:00:00 2001
From: Chad Austin <chadaustin@fb.com>
Date: Mon, 28 Jan 2019 16:34:34 -0800
Subject: [PATCH] fuse: cache readdir calls if filesystem opts out of opendir
If a filesystem returns ENOSYS from opendir and thus opts out of
opendir and releasedir requests, it almost certainly would also like
readdir results cached. Default open_flags to FOPEN_KEEP_CACHE and
FOPEN_CACHE_DIR in that case.
With this patch, I've measured recursive directory enumeration across
large FUSE mounts to be faster than native mounts.
Signed-off-by: Chad Austin <chadaustin@fb.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
---
fs/fuse/file.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index cc6ffd23b80f7..06096b60f1df2 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -124,7 +124,8 @@ int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
return -ENOMEM;
ff->fh = 0;
- ff->open_flags = FOPEN_KEEP_CACHE; /* Default for no-open */
+ /* Default for no-open */
+ ff->open_flags = FOPEN_KEEP_CACHE | (isdir ? FOPEN_CACHE_DIR : 0);
if (isdir ? !fc->no_opendir : !fc->no_open) {
struct fuse_open_out outarg;
int err;
--
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