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| author | Xiubo Li <xiubli@redhat.com> | 2020-05-20 03:51:19 -0400 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2020-06-01 13:22:53 +0200 |
| commit | ea8412b284c09742d5b11721e225b4ff011aa397 (patch) | |
| tree | 84699cc906c8a96ca329dda380a2628fe3acd931 /fs/ceph | |
| parent | 878dabb64117406abd40977b87544d05bb3031fc (diff) | |
| download | linux-stable-ea8412b284c09742d5b11721e225b4ff011aa397.tar.gz linux-stable-ea8412b284c09742d5b11721e225b4ff011aa397.tar.bz2 linux-stable-ea8412b284c09742d5b11721e225b4ff011aa397.zip | |
ceph: make sure mdsc->mutex is nested in s->s_mutex to fix dead lock
send_mds_reconnect takes the s_mutex while the mdsc->mutex is already
held. That inverts the locking order documented in mds_client.h. Drop
the mdsc->mutex, acquire the s_mutex and then reacquire the mdsc->mutex
to prevent a deadlock.
URL: https://tracker.ceph.com/issues/45609
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph')
| -rw-r--r-- | fs/ceph/mds_client.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 6c283c52d401..0e0ab01694dc 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -3769,8 +3769,6 @@ fail: * recovering MDS might have. * * This is a relatively heavyweight operation, but it's rare. - * - * called with mdsc->mutex held. */ static void send_mds_reconnect(struct ceph_mds_client *mdsc, struct ceph_mds_session *session) @@ -4024,7 +4022,9 @@ static void check_new_map(struct ceph_mds_client *mdsc, oldstate != CEPH_MDS_STATE_STARTING) pr_info("mds%d recovery completed\n", s->s_mds); kick_requests(mdsc, i); + mutex_unlock(&mdsc->mutex); mutex_lock(&s->s_mutex); + mutex_lock(&mdsc->mutex); ceph_kick_flushing_caps(mdsc, s); mutex_unlock(&s->s_mutex); wake_up_session_caps(s, RECONNECT); |