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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 #include <linux/ns_common.h>
  5 #include <linux/fs_pin.h>
  6 
  7 struct mnt_namespace {
  8         atomic_t                count;
  9         struct ns_common        ns;
 10         struct mount *  root;
 11         struct list_head        list;
 12         struct user_namespace   *user_ns;
 13         u64                     seq;    /* Sequence number to prevent loops */
 14         wait_queue_head_t poll;
 15         u64 event;
 16 };
 17 
 18 struct mnt_pcp {
 19         int mnt_count;
 20         int mnt_writers;
 21 };
 22 
 23 struct mountpoint {
 24         struct hlist_node m_hash;
 25         struct dentry *m_dentry;
 26         struct hlist_head m_list;
 27         int m_count;
 28 };
 29 
 30 struct mount {
 31         struct hlist_node mnt_hash;
 32         struct mount *mnt_parent;
 33         struct dentry *mnt_mountpoint;
 34         struct vfsmount mnt;
 35         union {
 36                 struct rcu_head mnt_rcu;
 37                 struct llist_node mnt_llist;
 38         };
 39 #ifdef CONFIG_SMP
 40         struct mnt_pcp __percpu *mnt_pcp;
 41 #else
 42         int mnt_count;
 43         int mnt_writers;
 44 #endif
 45         struct list_head mnt_mounts;    /* list of children, anchored here */
 46         struct list_head mnt_child;     /* and going through their mnt_child */
 47         struct list_head mnt_instance;  /* mount instance on sb->s_mounts */
 48         const char *mnt_devname;        /* Name of device e.g. /dev/dsk/hda1 */
 49         struct list_head mnt_list;
 50         struct list_head mnt_expire;    /* link in fs-specific expiry list */
 51         struct list_head mnt_share;     /* circular list of shared mounts */
 52         struct list_head mnt_slave_list;/* list of slave mounts */
 53         struct list_head mnt_slave;     /* slave list entry */
 54         struct mount *mnt_master;       /* slave is on master->mnt_slave_list */
 55         struct mnt_namespace *mnt_ns;   /* containing namespace */
 56         struct mountpoint *mnt_mp;      /* where is it mounted */
 57         struct hlist_node mnt_mp_list;  /* list mounts with the same mountpoint */
 58 #ifdef CONFIG_FSNOTIFY
 59         struct hlist_head mnt_fsnotify_marks;
 60         __u32 mnt_fsnotify_mask;
 61 #endif
 62         int mnt_id;                     /* mount identifier */
 63         int mnt_group_id;               /* peer group identifier */
 64         int mnt_expiry_mark;            /* true if marked for expiry */
 65         struct hlist_head mnt_pins;
 66         struct fs_pin mnt_umount;
 67         struct dentry *mnt_ex_mountpoint;
 68 };
 69 
 70 #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
 71 
 72 static inline struct mount *real_mount(struct vfsmount *mnt)
 73 {
 74         return container_of(mnt, struct mount, mnt);
 75 }
 76 
 77 static inline int mnt_has_parent(struct mount *mnt)
 78 {
 79         return mnt != mnt->mnt_parent;
 80 }
 81 
 82 static inline int is_mounted(struct vfsmount *mnt)
 83 {
 84         /* neither detached nor internal? */
 85         return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns);
 86 }
 87 
 88 extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *);
 89 extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *);
 90 
 91 extern bool legitimize_mnt(struct vfsmount *, unsigned);
 92 
 93 extern void __detach_mounts(struct dentry *dentry);
 94 
 95 static inline void detach_mounts(struct dentry *dentry)
 96 {
 97         if (!d_mountpoint(dentry))
 98                 return;
 99         __detach_mounts(dentry);
100 }
101 
102 static inline void get_mnt_ns(struct mnt_namespace *ns)
103 {
104         atomic_inc(&ns->count);
105 }
106 
107 extern seqlock_t mount_lock;
108 
109 static inline void lock_mount_hash(void)
110 {
111         write_seqlock(&mount_lock);
112 }
113 
114 static inline void unlock_mount_hash(void)
115 {
116         write_sequnlock(&mount_lock);
117 }
118 
119 struct proc_mounts {
120         struct seq_file m;
121         struct mnt_namespace *ns;
122         struct path root;
123         int (*show)(struct seq_file *, struct vfsmount *);
124         void *cached_mount;
125         u64 cached_event;
126         loff_t cached_index;
127 };
128 
129 #define proc_mounts(p) (container_of((p), struct proc_mounts, m))
130 
131 extern const struct seq_operations mounts_op;
132 
133 extern bool __is_local_mountpoint(struct dentry *dentry);
134 static inline bool is_local_mountpoint(struct dentry *dentry)
135 {
136         if (!d_mountpoint(dentry))
137                 return false;
138 
139         return __is_local_mountpoint(dentry);
140 }
141 

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