From: Sage Weil <sage@newdream.net>
Date: Thu, 22 Jul 2010 20:47:21 +0000 (-0700)
Subject: ceph: avoid dcache readdir for snapdir
X-Git-Tag: firefly_0821_release~9833^2~1344^2~6
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a0dff78dab0ff8d78bd5c9e33c105cf1292f2282;p=firefly-linux-kernel-4.4.55.git

ceph: avoid dcache readdir for snapdir

We should always go to the MDS for readdir on the hidden snapdir.  The
set of snapshots can change at any time; the client can't trust its cache
for that.

Signed-off-by: Sage Weil <sage@newdream.net>
---

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index f85719310db2..ea36ba9960d3 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -266,6 +266,7 @@ static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
 	spin_lock(&inode->i_lock);
 	if ((filp->f_pos == 2 || fi->dentry) &&
 	    !ceph_test_opt(client, NOASYNCREADDIR) &&
+	    ceph_snap(inode) != CEPH_SNAPDIR &&
 	    (ci->i_ceph_flags & CEPH_I_COMPLETE) &&
 	    __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
 		err = __dcache_readdir(filp, dirent, filldir);