linux-kernel - [PATCH 5.6 098/194] NFS: Fix fscache super

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Message-Id: <20200518173540.177761246@linuxfoundation.org>
Date:   Mon, 18 May 2020 19:36:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dave Wysochanski <dwysocha@...hat.com>,
        David Howells <dhowells@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.6 098/194] NFS: Fix fscache super_cookie allocation

From: Dave Wysochanski <dwysocha@...hat.com>

[ Upstream commit 15751612734ca0c419ac43ce986c9badcb5e2829 ]

Commit f2aedb713c28 ("NFS: Add fs_context support.") reworked
NFS mount code paths for fs_context support which included
super_block initialization.  In the process there was an extra
return left in the code and so we never call
nfs_fscache_get_super_cookie even if 'fsc' is given on as mount
option.  In addition, there is an extra check inside
nfs_fscache_get_super_cookie for the NFS_OPTION_FSCACHE which
is unnecessary since the only caller nfs_get_cache_cookie
checks this flag.

Fixes: f2aedb713c28 ("NFS: Add fs_context support.")
Signed-off-by: Dave Wysochanski <dwysocha@...hat.com>
Signed-off-by: David Howells <dhowells@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/nfs/fscache.c | 2 --
 fs/nfs/super.c   | 1 -
 2 files changed, 3 deletions(-)

diff --git a/fs/nfs/fscache.c b/fs/nfs/fscache.c
index 8eff1fd806b1c..f517184156068 100644
--- a/fs/nfs/fscache.c
+++ b/fs/nfs/fscache.c
@@ -118,8 +118,6 @@ void nfs_fscache_get_super_cookie(struct super_block *sb, const char *uniq, int
 
 	nfss->fscache_key = NULL;
 	nfss->fscache = NULL;
-	if (!(nfss->options & NFS_OPTION_FSCACHE))
-		return;
 	if (!uniq) {
 		uniq = "";
 		ulen = 1;
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index dada09b391c65..c0d5240b8a0ac 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1154,7 +1154,6 @@ static void nfs_get_cache_cookie(struct super_block *sb,
 			uniq = ctx->fscache_uniq;
 			ulen = strlen(ctx->fscache_uniq);
 		}
-		return;
 	}
 
 	nfs_fscache_get_super_cookie(sb, uniq, ulen);
-- 
2.20.1