From: Yan, Zheng Date: Thu, 6 Jul 2017 03:12:21 +0000 (+0800) Subject: ceph: fix race in concurrent readdir X-Git-Tag: v4.14-rc1~426^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=84583cfb973c4313955c6231cc9cb3772d280b15;p=platform%2Fkernel%2Flinux-rpi3.git ceph: fix race in concurrent readdir For a large directory, program needs to issue multiple readdir syscalls to get all dentries. When there are multiple programs read the directory concurrently. Following sequence of events can happen. - program calls readdir with pos = 2. ceph sends readdir request to mds. The reply contains N1 entries. ceph adds these N1 entries to readdir cache. - program calls readdir with pos = N1+2. The readdir is satisfied by the readdir cache, N2 entries are returned. (Other program calls readdir in the middle, which fills the cache) - program calls readdir with pos = N1+N2+2. ceph sends readdir request to mds. The reply contains N3 entries and it reaches directory end. ceph adds these N3 entries to the readdir cache and marks directory complete. The second readdir call does not update fi->readdir_cache_idx. ceph add the last N3 entries to wrong places. Cc: stable@vger.kernel.org # v4.3+ Signed-off-by: "Yan, Zheng" Signed-off-by: Ilya Dryomov --- diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index e071d23..ef7240a 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -271,6 +271,11 @@ out: if (ret < 0) err = ret; dput(last); + /* last_name no longer match cache index */ + if (fi->readdir_cache_idx >= 0) { + fi->readdir_cache_idx = -1; + fi->dir_release_count = 0; + } } return err; }