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ceph: clear d_fsinfo pointer under d_lock 

To check for a valid dentry lease, we need to get at the
ceph_dentry_info. Under rcuwalk though, we may end up with a dentry that
is on its way to destruction. Since we need to take the d_lock in
dentry_lease_is_valid already, we can just ensure that we clear the
d_fsinfo pointer out under the same lock before destroying it.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Jeff Layton 2016-07-01 09:39:20 -04:00 committed by Ilya Dryomov
parent 8aa152c778
commit 5b484a5131
1 changed files with 5 additions and 1 deletions
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6
fs/ceph/dir.c
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@ -1286,10 +1286,14 @@ static void ceph_d_release(struct dentry *dentry)
dout("d_release %p\n", dentry);
ceph_dentry_lru_del(dentry);
spin_lock(&dentry->d_lock);
dentry->d_fsdata = NULL;
spin_unlock(&dentry->d_lock);
if (di->lease_session)
ceph_put_mds_session(di->lease_session);
kmem_cache_free(ceph_dentry_cachep, di);
dentry->d_fsdata = NULL;
}
static int ceph_snapdir_d_revalidate(struct dentry *dentry,