1 #include <linux/mount.h> 2 #include <linux/seq_file.h> 3 #include <linux/poll.h> 4 5 struct mnt_namespace { 6 atomic_t count; 7 unsigned int proc_inum; 8 struct mount * root; 9 struct list_head list; 10 struct user_namespace *user_ns; 11 u64 seq; /* Sequence number to prevent loops */ 12 wait_queue_head_t poll; 13 u64 event; 14 }; 15 16 struct mnt_pcp { 17 int mnt_count; 18 int mnt_writers; 19 }; 20 21 struct mountpoint { 22 struct hlist_node m_hash; 23 struct dentry *m_dentry; 24 int m_count; 25 }; 26 27 struct mount { 28 struct hlist_node mnt_hash; 29 struct mount *mnt_parent; 30 struct dentry *mnt_mountpoint; 31 struct vfsmount mnt; 32 struct rcu_head mnt_rcu; 33 #ifdef CONFIG_SMP 34 struct mnt_pcp __percpu *mnt_pcp; 35 #else 36 int mnt_count; 37 int mnt_writers; 38 #endif 39 struct list_head mnt_mounts; /* list of children, anchored here */ 40 struct list_head mnt_child; /* and going through their mnt_child */ 41 struct list_head mnt_instance; /* mount instance on sb->s_mounts */ 42 const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ 43 struct list_head mnt_list; 44 struct list_head mnt_expire; /* link in fs-specific expiry list */ 45 struct list_head mnt_share; /* circular list of shared mounts */ 46 struct list_head mnt_slave_list;/* list of slave mounts */ 47 struct list_head mnt_slave; /* slave list entry */ 48 struct mount *mnt_master; /* slave is on master->mnt_slave_list */ 49 struct mnt_namespace *mnt_ns; /* containing namespace */ 50 struct mountpoint *mnt_mp; /* where is it mounted */ 51 #ifdef CONFIG_FSNOTIFY 52 struct hlist_head mnt_fsnotify_marks; 53 __u32 mnt_fsnotify_mask; 54 #endif 55 int mnt_id; /* mount identifier */ 56 int mnt_group_id; /* peer group identifier */ 57 int mnt_expiry_mark; /* true if marked for expiry */ 58 int mnt_pinned; 59 struct path mnt_ex_mountpoint; 60 }; 61 62 #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */ 63 64 static inline struct mount *real_mount(struct vfsmount *mnt) 65 { 66 return container_of(mnt, struct mount, mnt); 67 } 68 69 static inline int mnt_has_parent(struct mount *mnt) 70 { 71 return mnt != mnt->mnt_parent; 72 } 73 74 static inline int is_mounted(struct vfsmount *mnt) 75 { 76 /* neither detached nor internal? */ 77 return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns); 78 } 79 80 extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *); 81 extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *); 82 83 extern bool legitimize_mnt(struct vfsmount *, unsigned); 84 85 static inline void get_mnt_ns(struct mnt_namespace *ns) 86 { 87 atomic_inc(&ns->count); 88 } 89 90 extern seqlock_t mount_lock; 91 92 static inline void lock_mount_hash(void) 93 { 94 write_seqlock(&mount_lock); 95 } 96 97 static inline void unlock_mount_hash(void) 98 { 99 write_sequnlock(&mount_lock); 100 } 101 102 struct proc_mounts { 103 struct seq_file m; 104 struct mnt_namespace *ns; 105 struct path root; 106 int (*show)(struct seq_file *, struct vfsmount *); 107 void *cached_mount; 108 u64 cached_event; 109 loff_t cached_index; 110 }; 111 112 #define proc_mounts(p) (container_of((p), struct proc_mounts, m)) 113 114 extern const struct seq_operations mounts_op; 115