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Linux/fs/mount.h

  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         struct ucounts          *ucounts;
 14         u64                     seq;    /* Sequence number to prevent loops */
 15         wait_queue_head_t poll;
 16         u64 event;
 17         unsigned int            mounts; /* # of mounts in the namespace */
 18         unsigned int            pending_mounts;
 19 };
 20 
 21 struct mnt_pcp {
 22         int mnt_count;
 23         int mnt_writers;
 24 };
 25 
 26 struct mountpoint {
 27         struct hlist_node m_hash;
 28         struct dentry *m_dentry;
 29         struct hlist_head m_list;
 30         int m_count;
 31 };
 32 
 33 struct mount {
 34         struct hlist_node mnt_hash;
 35         struct mount *mnt_parent;
 36         struct dentry *mnt_mountpoint;
 37         struct vfsmount mnt;
 38         union {
 39                 struct rcu_head mnt_rcu;
 40                 struct llist_node mnt_llist;
 41         };
 42 #ifdef CONFIG_SMP
 43         struct mnt_pcp __percpu *mnt_pcp;
 44 #else
 45         int mnt_count;
 46         int mnt_writers;
 47 #endif
 48         struct list_head mnt_mounts;    /* list of children, anchored here */
 49         struct list_head mnt_child;     /* and going through their mnt_child */
 50         struct list_head mnt_instance;  /* mount instance on sb->s_mounts */
 51         const char *mnt_devname;        /* Name of device e.g. /dev/dsk/hda1 */
 52         struct list_head mnt_list;
 53         struct list_head mnt_expire;    /* link in fs-specific expiry list */
 54         struct list_head mnt_share;     /* circular list of shared mounts */
 55         struct list_head mnt_slave_list;/* list of slave mounts */
 56         struct list_head mnt_slave;     /* slave list entry */
 57         struct mount *mnt_master;       /* slave is on master->mnt_slave_list */
 58         struct mnt_namespace *mnt_ns;   /* containing namespace */
 59         struct mountpoint *mnt_mp;      /* where is it mounted */
 60         struct hlist_node mnt_mp_list;  /* list mounts with the same mountpoint */
 61 #ifdef CONFIG_FSNOTIFY
 62         struct hlist_head mnt_fsnotify_marks;
 63         __u32 mnt_fsnotify_mask;
 64 #endif
 65         int mnt_id;                     /* mount identifier */
 66         int mnt_group_id;               /* peer group identifier */
 67         int mnt_expiry_mark;            /* true if marked for expiry */
 68         struct hlist_head mnt_pins;
 69         struct fs_pin mnt_umount;
 70         struct dentry *mnt_ex_mountpoint;
 71 };
 72 
 73 #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
 74 
 75 static inline struct mount *real_mount(struct vfsmount *mnt)
 76 {
 77         return container_of(mnt, struct mount, mnt);
 78 }
 79 
 80 static inline int mnt_has_parent(struct mount *mnt)
 81 {
 82         return mnt != mnt->mnt_parent;
 83 }
 84 
 85 static inline int is_mounted(struct vfsmount *mnt)
 86 {
 87         /* neither detached nor internal? */
 88         return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns);
 89 }
 90 
 91 extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *);
 92 extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *);
 93 
 94 extern int __legitimize_mnt(struct vfsmount *, unsigned);
 95 extern bool legitimize_mnt(struct vfsmount *, unsigned);
 96 
 97 static inline bool __path_is_mountpoint(const struct path *path)
 98 {
 99         struct mount *m = __lookup_mnt(path->mnt, path->dentry);
100         return m && likely(!(m->mnt.mnt_flags & MNT_SYNC_UMOUNT));
101 }
102 
103 extern void __detach_mounts(struct dentry *dentry);
104 
105 static inline void detach_mounts(struct dentry *dentry)
106 {
107         if (!d_mountpoint(dentry))
108                 return;
109         __detach_mounts(dentry);
110 }
111 
112 static inline void get_mnt_ns(struct mnt_namespace *ns)
113 {
114         atomic_inc(&ns->count);
115 }
116 
117 extern seqlock_t mount_lock;
118 
119 static inline void lock_mount_hash(void)
120 {
121         write_seqlock(&mount_lock);
122 }
123 
124 static inline void unlock_mount_hash(void)
125 {
126         write_sequnlock(&mount_lock);
127 }
128 
129 struct proc_mounts {
130         struct mnt_namespace *ns;
131         struct path root;
132         int (*show)(struct seq_file *, struct vfsmount *);
133         void *cached_mount;
134         u64 cached_event;
135         loff_t cached_index;
136 };
137 
138 extern const struct seq_operations mounts_op;
139 
140 extern bool __is_local_mountpoint(struct dentry *dentry);
141 static inline bool is_local_mountpoint(struct dentry *dentry)
142 {
143         if (!d_mountpoint(dentry))
144                 return false;
145 
146         return __is_local_mountpoint(dentry);
147 }
148 

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