From: Steve French <stfrench@microsoft.com>
Date: Wed, 10 Nov 2021 09:15:29 +0000 (-0600)
Subject: smb3: do not setup the fscache_super_cookie until fsinfo initialized
X-Git-Tag: microblaze-v5.18~495^2~4
X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=02102744d364c1bca4a0da13c2a72656037f64eb;p=linux-2.6-microblaze.git

smb3: do not setup the fscache_super_cookie until fsinfo initialized

We were calling cifs_fscache_get_super_cookie after tcon but before
we queried the info (QFS_Info) we need to initialize the cookie
properly.  Also includes an additional check suggested by Paulo
to make sure we don't initialize super cookie twice.

Suggested-by: David Howells <dhowells@redhat.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
---

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 5c506f6ecd65..084605f7ce96 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2350,8 +2350,6 @@ cifs_get_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
 	list_add(&tcon->tcon_list, &ses->tcon_list);
 	spin_unlock(&cifs_tcp_ses_lock);
 
-	cifs_fscache_get_super_cookie(tcon);
-
 	return tcon;
 
 out_fail:
@@ -3003,6 +3001,12 @@ static int mount_get_conns(struct mount_ctx *mnt_ctx)
 				cifs_dbg(VFS, "read only mount of RW share\n");
 			/* no need to log a RW mount of a typical RW share */
 		}
+		/*
+		 * The cookie is initialized from volume info returned above.
+		 * Inside cifs_fscache_get_super_cookie it checks
+		 * that we do not get super cookie twice.
+		 */
+		cifs_fscache_get_super_cookie(tcon);
 	}
 
 	/*
diff --git a/fs/cifs/fscache.c b/fs/cifs/fscache.c
index 8eedd20c44ab..7e409a38a2d7 100644
--- a/fs/cifs/fscache.c
+++ b/fs/cifs/fscache.c
@@ -87,6 +87,14 @@ void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon)
 	char *sharename;
 	struct cifs_fscache_super_auxdata auxdata;
 
+	/*
+	 * Check if cookie was already initialized so don't reinitialize it.
+	 * In the future, as we integrate with newer fscache features,
+	 * we may want to instead add a check if cookie has changed
+	 */
+	if (tcon->fscache == NULL)
+		return;
+
 	sharename = extract_sharename(tcon->treeName);
 	if (IS_ERR(sharename)) {
 		cifs_dbg(FYI, "%s: couldn't extract sharename\n", __func__);