linux-kernel - [PATCH AUTOSEL 4.19 26/34] afs: Fix creation calls in the dynamic root to fail with EOPNOTSUPP

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Date:   Fri, 20 Dec 2019 09:34:25 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     David Howells <dhowells@...hat.com>,
        Marc Dionne <marc.dionne@...istor.com>,
        Jonathan Billings <jsbillings@...illings.org>,
        Sasha Levin <sashal@...nel.org>, linux-afs@...ts.infradead.org
Subject: [PATCH AUTOSEL 4.19 26/34] afs: Fix creation calls in the dynamic root to fail with EOPNOTSUPP

From: David Howells <dhowells@...hat.com>

[ Upstream commit 1da4bd9f9d187f53618890d7b66b9628bbec3c70 ]

Fix the lookup method on the dynamic root directory such that creation
calls, such as mkdir, open(O_CREAT), symlink, etc. fail with EOPNOTSUPP
rather than failing with some odd error (such as EEXIST).

lookup() itself tries to create automount directories when it is invoked.
These are cached locally in RAM and not committed to storage.

Signed-off-by: David Howells <dhowells@...hat.com>
Reviewed-by: Marc Dionne <marc.dionne@...istor.com>
Tested-by: Jonathan Billings <jsbillings@...illings.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/afs/dynroot.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/afs/dynroot.c b/fs/afs/dynroot.c
index f29c6dade7f62..069273a2483f9 100644
--- a/fs/afs/dynroot.c
+++ b/fs/afs/dynroot.c
@@ -145,6 +145,9 @@ static struct dentry *afs_dynroot_lookup(struct inode *dir, struct dentry *dentr
 
 	ASSERTCMP(d_inode(dentry), ==, NULL);
 
+	if (flags & LOOKUP_CREATE)
+		return ERR_PTR(-EOPNOTSUPP);
+
 	if (dentry->d_name.len >= AFSNAMEMAX) {
 		_leave(" = -ENAMETOOLONG");
 		return ERR_PTR(-ENAMETOOLONG);
-- 
2.20.1