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-rw-r--r--fs/mount.h27
1 files changed, 16 insertions, 11 deletions
diff --git a/fs/mount.h b/fs/mount.h
index 130c07c2f8..4a42fc68f4 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -8,19 +8,13 @@
struct mnt_namespace {
struct ns_common ns;
struct mount * root;
- /*
- * Traversal and modification of .list is protected by either
- * - taking namespace_sem for write, OR
- * - taking namespace_sem for read AND taking .ns_lock.
- */
- struct list_head list;
- spinlock_t ns_lock;
+ struct rb_root mounts; /* Protected by namespace_sem */
struct user_namespace *user_ns;
struct ucounts *ucounts;
u64 seq; /* Sequence number to prevent loops */
wait_queue_head_t poll;
u64 event;
- unsigned int mounts; /* # of mounts in the namespace */
+ unsigned int nr_mounts; /* # of mounts in the namespace */
unsigned int pending_mounts;
} __randomize_layout;
@@ -55,7 +49,10 @@ struct mount {
struct list_head mnt_child; /* and going through their mnt_child */
struct list_head mnt_instance; /* mount instance on sb->s_mounts */
const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
- struct list_head mnt_list;
+ union {
+ struct rb_node mnt_node; /* Under ns->mounts */
+ struct list_head mnt_list;
+ };
struct list_head mnt_expire; /* link in fs-specific expiry list */
struct list_head mnt_share; /* circular list of shared mounts */
struct list_head mnt_slave_list;/* list of slave mounts */
@@ -72,7 +69,8 @@ struct mount {
struct fsnotify_mark_connector __rcu *mnt_fsnotify_marks;
__u32 mnt_fsnotify_mask;
#endif
- int mnt_id; /* mount identifier */
+ int mnt_id; /* mount identifier, reused */
+ u64 mnt_id_unique; /* mount ID unique until reboot */
int mnt_group_id; /* peer group identifier */
int mnt_expiry_mark; /* true if marked for expiry */
struct hlist_head mnt_pins;
@@ -127,7 +125,6 @@ struct proc_mounts {
struct mnt_namespace *ns;
struct path root;
int (*show)(struct seq_file *, struct vfsmount *);
- struct mount cursor;
};
extern const struct seq_operations mounts_op;
@@ -146,4 +143,12 @@ static inline bool is_anon_ns(struct mnt_namespace *ns)
return ns->seq == 0;
}
+static inline void move_from_ns(struct mount *mnt, struct list_head *dt_list)
+{
+ WARN_ON(!(mnt->mnt.mnt_flags & MNT_ONRB));
+ mnt->mnt.mnt_flags &= ~MNT_ONRB;
+ rb_erase(&mnt->mnt_node, &mnt->mnt_ns->mounts);
+ list_add_tail(&mnt->mnt_list, dt_list);
+}
+
extern void mnt_cursor_del(struct mnt_namespace *ns, struct mount *cursor);