diff options
Diffstat (limited to 'fs/mount.h')
| -rw-r--r-- | fs/mount.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/fs/mount.h b/fs/mount.h index ffb613cdfeee..7aecf2a60472 100644 --- a/fs/mount.h +++ b/fs/mount.h @@ -5,6 +5,12 @@ #include <linux/ns_common.h> #include <linux/fs_pin.h> +extern struct list_head notify_list; + +typedef __u32 __bitwise mntns_flags_t; + +#define MNTNS_PROPAGATING ((__force mntns_flags_t)(1 << 0)) + struct mnt_namespace { struct ns_common ns; struct mount * root; @@ -20,12 +26,18 @@ struct mnt_namespace { wait_queue_head_t poll; struct rcu_head mnt_ns_rcu; }; + u64 seq_origin; /* Sequence number of origin mount namespace */ u64 event; +#ifdef CONFIG_FSNOTIFY + __u32 n_fsnotify_mask; + struct fsnotify_mark_connector __rcu *n_fsnotify_marks; +#endif unsigned int nr_mounts; /* # of mounts in the namespace */ unsigned int pending_mounts; struct rb_node mnt_ns_tree_node; /* node in the mnt_ns_tree */ struct list_head mnt_ns_list; /* entry in the sequential list of mounts namespace */ refcount_t passive; /* number references not pinning @mounts */ + mntns_flags_t mntns_flags; } __randomize_layout; struct mnt_pcp { @@ -76,6 +88,8 @@ 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 */ @@ -156,6 +170,11 @@ 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; @@ -177,3 +196,21 @@ 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); |