diff options
| author | Miklos Szeredi <mszeredi@redhat.com> | 2025-01-29 17:58:01 +0100 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-02-05 17:21:11 +0100 |
| commit | bf630c40164162ba1d3933c2f5e3397d083e0948 (patch) | |
| tree | 13e0a2996eb365af23f498ae963bbd77bc0a6a60 /fs/mount.h | |
| parent | 0f46d81f2bce970b1c562aa3c944a271bbec2729 (diff) | |
vfs: add notifications for mount attach and detach
Add notifications for attaching and detaching mounts to fs/namespace.c
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Link: https://lore.kernel.org/r/20250129165803.72138-4-mszeredi@redhat.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/mount.h')
| -rw-r--r-- | fs/mount.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/mount.h b/fs/mount.h index 5324a931b403..946dc8b792d7 100644 --- a/fs/mount.h +++ b/fs/mount.h @@ -5,6 +5,8 @@ #include <linux/ns_common.h> #include <linux/fs_pin.h> +extern struct list_head notify_list; + struct mnt_namespace { struct ns_common ns; struct mount * root; @@ -80,6 +82,8 @@ struct mount { #ifdef CONFIG_FSNOTIFY struct fsnotify_mark_connector __rcu *mnt_fsnotify_marks; __u32 mnt_fsnotify_mask; + struct list_head to_notify; /* need to queue notification */ + struct mnt_namespace *prev_ns; /* previous namespace (NULL if none) */ #endif int mnt_id; /* mount identifier, reused */ u64 mnt_id_unique; /* mount ID unique until reboot */ @@ -182,4 +186,20 @@ static inline struct mnt_namespace *to_mnt_ns(struct ns_common *ns) return container_of(ns, struct mnt_namespace, ns); } +#ifdef CONFIG_FSNOTIFY +static inline void mnt_notify_add(struct mount *m) +{ + /* Optimize the case where there are no watches */ + if ((m->mnt_ns && m->mnt_ns->n_fsnotify_marks) || + (m->prev_ns && m->prev_ns->n_fsnotify_marks)) + list_add_tail(&m->to_notify, ¬ify_list); + else + m->prev_ns = m->mnt_ns; +} +#else +static inline void mnt_notify_add(struct mount *m) +{ +} +#endif + struct mnt_namespace *mnt_ns_from_dentry(struct dentry *dentry); |