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TOMOYO Linux Cross Reference
Linux/fs/mount.h

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  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 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 };
108 
109 #define proc_mounts(p) (container_of((p), struct proc_mounts, m))
110 
111 extern const struct seq_operations mounts_op;
112 

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