[PATCH 1/3] fs: ensure that internal tmpfs mount gets mount id zero

[Christian Brauner <brauner@kernel.org>]

and the rootfs get mount id one as it always has. Before we actually
mount the rootfs we create an internal tmpfs mount which has mount id
zero but is never exposed anywhere. Continue that "tradition".

Fixes: 7f9bfafc5f49 ("fs: use xarray for old mount id")
Cc: <stable@vger.kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
---
 fs/namespace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index c58674a20cad..8b082b1de7f3 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -221,7 +221,7 @@ static int mnt_alloc_id(struct mount *mnt)
 	int res;
 
 	xa_lock(&mnt_id_xa);
-	res = __xa_alloc(&mnt_id_xa, &mnt->mnt_id, mnt, XA_LIMIT(1, INT_MAX), GFP_KERNEL);
+	res = __xa_alloc(&mnt_id_xa, &mnt->mnt_id, mnt, xa_limit_31b, GFP_KERNEL);
 	if (!res)
 		mnt->mnt_id_unique = ++mnt_id_ctr;
 	xa_unlock(&mnt_id_xa);

-- 
2.47.3