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[RFC,1/5] fs: use all available ids

Message ID 20240719-work-mount-namespace-v1-1-834113cab0d2@kernel.org (mailing list archive)
State New
Headers show
Series nsfs: iterate through mount namespaces | expand

Commit Message

Christian Brauner July 19, 2024, 11:41 a.m. UTC 
The counter is unconditionally incremented for each mount allocation.
If we set it to 1ULL << 32 we're losing 4294967296 as the first valid
non-32 bit mount id.

Signed-off-by: Christian Brauner <brauner@kernel.org>
---
 fs/namespace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/fs/namespace.c b/fs/namespace.c
index 221db9de4729..328087a4df8a 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -70,7 +70,7 @@  static DEFINE_IDA(mnt_id_ida);
 static DEFINE_IDA(mnt_group_ida);
 
 /* Don't allow confusion with old 32bit mount ID */
-#define MNT_UNIQUE_ID_OFFSET (1ULL << 32)
+#define MNT_UNIQUE_ID_OFFSET (1ULL << 31)
 static atomic64_t mnt_id_ctr = ATOMIC64_INIT(MNT_UNIQUE_ID_OFFSET);
 
 static struct hlist_head *mount_hashtable __ro_after_init;