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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>
This commit is contained in:
Chad Austin 2019-01-28 16:34:34 -08:00 committed by Miklos Szeredi
parent d9a9ea94f7
commit fabf7e0262
1 changed files with 2 additions and 1 deletions
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3
fs/fuse/file.c
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@ -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;