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fs: ensure that internal tmpfs mount gets mount id zero

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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".

Link: https://patch.msgid.link/20260112-work-immutable-rootfs-v2-1-88dd1c34a204@kernel.org
Fixes: 7f9bfafc5f ("fs: use xarray for old mount id")
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2026-01-12 16:47:08 +01:00
parent 8f0b4cce44
commit a2062463e8
1 changed files with 1 additions and 1 deletions
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2
fs/namespace.c
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@ -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);