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fs: add mnt_ns_empty() helper

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Add a helper that checks whether a give mount namespace is empty instead
of open-coding the specific data structure check. This also be will be
used in follow-up patches.

Link: https://lore.kernel.org/r/20250221-brauner-open_tree-v1-2-dbcfcb98c676@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-02-21 14:13:01 +01:00
parent 3b0cdba4da
commit 2f576220cd
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GPG key ID: 91C61BC06578DCA2
2 changed files with 7 additions and 2 deletions
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5
fs/mount.h
View file

@ -157,6 +157,11 @@ static inline bool mnt_ns_attached(const struct mount *mnt)
return !RB_EMPTY_NODE(&mnt->mnt_node);
}
static inline bool mnt_ns_empty(const struct mnt_namespace *ns)
{
return RB_EMPTY_ROOT(&ns->mounts);
}
static inline void move_from_ns(struct mount *mnt, struct list_head *dt_list)
{
struct mnt_namespace *ns = mnt->mnt_ns;

4
fs/namespace.c
View file

@ -5315,7 +5315,7 @@ static int grab_requested_root(struct mnt_namespace *ns, struct path *root)
* We have to find the first mount in our ns and use that, however it
* may not exist, so handle that properly.
*/
if (RB_EMPTY_ROOT(&ns->mounts))
if (mnt_ns_empty(ns))
return -ENOENT;
first = child = ns->root;
@ -5340,7 +5340,7 @@ static int do_statmount(struct kstatmount *s, u64 mnt_id, u64 mnt_ns_id,
int err;
/* Has the namespace already been emptied? */
if (mnt_ns_id && RB_EMPTY_ROOT(&ns->mounts))
if (mnt_ns_id && mnt_ns_empty(ns))
return -ENOENT;
s->mnt = lookup_mnt_in_ns(mnt_id, ns);