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