From 1da4bd9f9d187f53618890d7b66b9628bbec3c70 Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@redhat.com>
Date: Wed, 11 Dec 2019 08:56:04 +0000
Subject: [PATCH] afs: Fix creation calls in the dynamic root to fail with EOPNOTSUPP
Git-commit: 1da4bd9f9d187f53618890d7b66b9628bbec3c70
Patch-mainline: v5.5-rc2
References: git-fixes
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@redhat.com>
Reviewed-by: Marc Dionne <marc.dionne@auristor.com>
Tested-by: Jonathan Billings <jsbillings@jsbillings.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
fs/afs/dynroot.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/afs/dynroot.c b/fs/afs/dynroot.c
index 4150280509ff..7503899c0a1b 100644
--- a/fs/afs/dynroot.c
+++ b/fs/afs/dynroot.c
@@ -136,6 +136,9 @@ 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);
--
2.16.4