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 struct mount * root; 8 struct list_head list; 9 wait_queue_head_t poll; 10 int event; 11 }; 12 13 struct mnt_pcp { 14 int mnt_count; 15 int mnt_writers; 16 }; 17 18 struct mount { 19 struct list_head mnt_hash; 20 struct mount *mnt_parent; 21 struct dentry *mnt_mountpoint; 22 struct vfsmount mnt; 23 #ifdef CONFIG_SMP 24 struct mnt_pcp __percpu *mnt_pcp; 25 #else 26 int mnt_count; 27 int mnt_writers; 28 #endif 29 struct list_head mnt_mounts; /* list of children, anchored here */ 30 struct list_head mnt_child; /* and going through their mnt_child */ 31 struct list_head mnt_instance; /* mount instance on sb->s_mounts */ 32 const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ 33 struct list_head mnt_list; 34 struct list_head mnt_expire; /* link in fs-specific expiry list */ 35 struct list_head mnt_share; /* circular list of shared mounts */ 36 struct list_head mnt_slave_list;/* list of slave mounts */ 37 struct list_head mnt_slave; /* slave list entry */ 38 struct mount *mnt_master; /* slave is on master->mnt_slave_list */ 39 struct mnt_namespace *mnt_ns; /* containing namespace */ 40 #ifdef CONFIG_FSNOTIFY 41 struct hlist_head mnt_fsnotify_marks; 42 __u32 mnt_fsnotify_mask; 43 #endif 44 int mnt_id; /* mount identifier */ 45 int mnt_group_id; /* peer group identifier */ 46 int mnt_expiry_mark; /* true if marked for expiry */ 47 int mnt_pinned; 48 int mnt_ghosts; 49 }; 50 51 #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */ 52 53 static inline struct mount *real_mount(struct vfsmount *mnt) 54 { 55 return container_of(mnt, struct mount, mnt); 56 } 57 58 static inline int mnt_has_parent(struct mount *mnt) 59 { 60 return mnt != mnt->mnt_parent; 61 } 62 63 static inline int is_mounted(struct vfsmount *mnt) 64 { 65 /* neither detached nor internal? */ 66 return !IS_ERR_OR_NULL(real_mount(mnt)); 67 } 68 69 extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int); 70 71 static inline void get_mnt_ns(struct mnt_namespace *ns) 72 { 73 atomic_inc(&ns->count); 74 } 75 76 struct proc_mounts { 77 struct seq_file m; 78 struct mnt_namespace *ns; 79 struct path root; 80 int (*show)(struct seq_file *, struct vfsmount *); 81 }; 82 83 #define proc_mounts(p) (container_of((p), struct proc_mounts, m)) 84 85 extern const struct seq_operations mounts_op; 86