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
   5struct 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
  16struct mnt_pcp {
  17        int mnt_count;
  18        int mnt_writers;
  19};
  20
  21struct mountpoint {
  22        struct list_head m_hash;
  23        struct dentry *m_dentry;
  24        int m_count;
  25};
  26
  27struct mount {
  28        struct list_head mnt_hash;
  29        struct mount *mnt_parent;
  30        struct dentry *mnt_mountpoint;
  31        struct vfsmount mnt;
  32#ifdef CONFIG_SMP
  33        struct mnt_pcp __percpu *mnt_pcp;
  34#else
  35        int mnt_count;
  36        int mnt_writers;
  37#endif
  38        struct list_head mnt_mounts;    /* list of children, anchored here */
  39        struct list_head mnt_child;     /* and going through their mnt_child */
  40        struct list_head mnt_instance;  /* mount instance on sb->s_mounts */
  41        const char *mnt_devname;        /* Name of device e.g. /dev/dsk/hda1 */
  42        struct list_head mnt_list;
  43        struct list_head mnt_expire;    /* link in fs-specific expiry list */
  44        struct list_head mnt_share;     /* circular list of shared mounts */
  45        struct list_head mnt_slave_list;/* list of slave mounts */
  46        struct list_head mnt_slave;     /* slave list entry */
  47        struct mount *mnt_master;       /* slave is on master->mnt_slave_list */
  48        struct mnt_namespace *mnt_ns;   /* containing namespace */
  49        struct mountpoint *mnt_mp;      /* where is it mounted */
  50#ifdef CONFIG_FSNOTIFY
  51        struct hlist_head mnt_fsnotify_marks;
  52        __u32 mnt_fsnotify_mask;
  53#endif
  54        int mnt_id;                     /* mount identifier */
  55        int mnt_group_id;               /* peer group identifier */
  56        int mnt_expiry_mark;            /* true if marked for expiry */
  57        int mnt_pinned;
  58        int mnt_ghosts;
  59};
  60
  61#define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
  62
  63static inline struct mount *real_mount(struct vfsmount *mnt)
  64{
  65        return container_of(mnt, struct mount, mnt);
  66}
  67
  68static inline int mnt_has_parent(struct mount *mnt)
  69{
  70        return mnt != mnt->mnt_parent;
  71}
  72
  73static inline int is_mounted(struct vfsmount *mnt)
  74{
  75        /* neither detached nor internal? */
  76        return !IS_ERR_OR_NULL(real_mount(mnt));
  77}
  78
  79extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int);
  80
  81static inline void get_mnt_ns(struct mnt_namespace *ns)
  82{
  83        atomic_inc(&ns->count);
  84}
  85
  86struct proc_mounts {
  87        struct seq_file m;
  88        struct mnt_namespace *ns;
  89        struct path root;
  90        int (*show)(struct seq_file *, struct vfsmount *);
  91};
  92
  93#define proc_mounts(p) (container_of((p), struct proc_mounts, m))
  94
  95extern const struct seq_operations mounts_op;
  96
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