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fs: use all available ids

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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.

Link: https://lore.kernel.org/r/20240719-work-mount-namespace-v1-1-834113cab0d2@kernel.org
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2024-07-19 13:41:48 +02:00
parent 51d37982bb
commit 8eac5358ad
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1 changed files with 1 additions and 1 deletions
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fs/namespace.c
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@ -70,7 +70,7 @@ static DEFINE_IDA(mnt_id_ida);
static DEFINE_IDA(mnt_group_ida); static DEFINE_IDA(mnt_group_ida);
/* Don't allow confusion with old 32bit mount ID */ /* 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 atomic64_t mnt_id_ctr = ATOMIC64_INIT(MNT_UNIQUE_ID_OFFSET);
static struct hlist_head *mount_hashtable __ro_after_init; static struct hlist_head *mount_hashtable __ro_after_init;