linux-kernel - [PATCH 3/4] NFS: Fix fscache super

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Message-ID: <158897467426.1116213.7204124165866196132.stgit@warthog.procyon.org.uk>
Date:   Fri, 08 May 2020 22:51:14 +0100
From:   David Howells <dhowells@...hat.com>
To:     torvalds@...ux-foundation.org,
        Trond Myklebust <trond.myklebust@...merspace.com>
Cc:     Dave Wysochanski <dwysocha@...hat.com>, dhowells@...hat.com,
        Anna Schumaker <anna.schumaker@...app.com>,
        linux-nfs@...r.kernel.org, linux-cachefs@...hat.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] NFS: Fix fscache super_cookie allocation

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

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>
---

 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 8eff1fd806b1..f51718415606 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 59ef3b13ccca..cc34aa3a8ba4 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1189,7 +1189,6 @@ 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);