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 int event; 14 }; 15 16 struct mnt_pcp { 17 int mnt_count; 18 int mnt_writers; 19 }; 20 21 struct mountpoint { 22 struct list_head m_hash; 23 struct dentry *m_dentry; 24 int m_count; 25 }; 26 27 struct mount { 28 struct list_head mnt_hash; 29 struct mount *mnt_parent; 30 struct dentry *mnt_mountpoint; 31 struct vfsmount mnt; 32 #ifdef CONFIG_SMP 33 struct mnt_pcp __percpu *mnt_pcp; 34 #else 35 int mnt_count; 36 int mnt_writers; 37 #endif 38 struct list_head mnt_mounts; /* list of children, anchored here */ 39 struct list_head mnt_child; /* and going through their mnt_child */ 40 struct list_head mnt_instance; /* mount instance on sb->s_mounts */ 41 const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ 42 struct list_head mnt_list; 43 struct list_head mnt_expire; /* link in fs-specific expiry list */ 44 struct list_head mnt_share; /* circular list of shared mounts */ 45 struct list_head mnt_slave_list;/* list of slave mounts */ 46 struct list_head mnt_slave; /* slave list entry */ 47 struct mount *mnt_master; /* slave is on master->mnt_slave_list */ 48 struct mnt_namespace *mnt_ns; /* containing namespace */ 49 struct mountpoint *mnt_mp; /* where is it mounted */ 50 #ifdef CONFIG_FSNOTIFY 51 struct hlist_head mnt_fsnotify_marks; 52 __u32 mnt_fsnotify_mask; 53 #endif 54 int mnt_id; /* mount identifier */ 55 int mnt_group_id; /* peer group identifier */ 56 int mnt_expiry_mark; /* true if marked for expiry */ 57 int mnt_pinned; 58 int mnt_ghosts; 59 }; 60 61 #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */ 62 63 static inline struct mount *real_mount(struct vfsmount *mnt) 64 { 65 return container_of(mnt, struct mount, mnt); 66 } 67 68 static inline int mnt_has_parent(struct mount *mnt) 69 { 70 return mnt != mnt->mnt_parent; 71 } 72 73 static inline int is_mounted(struct vfsmount *mnt) 74 { 75 /* neither detached nor internal? */ 76 return !IS_ERR_OR_NULL(real_mount(mnt)); 77 } 78 79 extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int); 80 81 static inline void get_mnt_ns(struct mnt_namespace *ns) 82 { 83 atomic_inc(&ns->count); 84 } 85 86 struct proc_mounts { 87 struct seq_file m; 88 struct mnt_namespace *ns; 89 struct path root; 90 int (*show)(struct seq_file *, struct vfsmount *); 91 }; 92 93 #define proc_mounts(p) (container_of((p), struct proc_mounts, m)) 94 95 extern const struct seq_operations mounts_op; 96