Commit fabf7e02 authored Jan 28, 2019 by Chad Austin Committed by Miklos Szeredi Feb 13, 2019

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>

parent d9a9ea94

fs/fuse/file.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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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