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        struct mount *  root;
   8        struct list_head        list;
   9        wait_queue_head_t poll;
  10        int event;
  11};
  12
  13struct mnt_pcp {
  14        int mnt_count;
  15        int mnt_writers;
  16};
  17
  18struct 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        atomic_t mnt_longterm;          /* how many of the refs are longterm */
  26#else
  27        int mnt_count;
  28        int mnt_writers;
  29#endif
  30        struct list_head mnt_mounts;    /* list of children, anchored here */
  31        struct list_head mnt_child;     /* and going through their mnt_child */
  32        struct list_head mnt_instance;  /* mount instance on sb->s_mounts */
  33        const char *mnt_devname;        /* Name of device e.g. /dev/dsk/hda1 */
  34        struct list_head mnt_list;
  35        struct list_head mnt_expire;    /* link in fs-specific expiry list */
  36        struct list_head mnt_share;     /* circular list of shared mounts */
  37        struct list_head mnt_slave_list;/* list of slave mounts */
  38        struct list_head mnt_slave;     /* slave list entry */
  39        struct mount *mnt_master;       /* slave is on master->mnt_slave_list */
  40        struct mnt_namespace *mnt_ns;   /* containing namespace */
  41#ifdef CONFIG_FSNOTIFY
  42        struct hlist_head mnt_fsnotify_marks;
  43        __u32 mnt_fsnotify_mask;
  44#endif
  45        int mnt_id;                     /* mount identifier */
  46        int mnt_group_id;               /* peer group identifier */
  47        int mnt_expiry_mark;            /* true if marked for expiry */
  48        int mnt_pinned;
  49        int mnt_ghosts;
  50};
  51
  52static inline struct mount *real_mount(struct vfsmount *mnt)
  53{
  54        return container_of(mnt, struct mount, mnt);
  55}
  56
  57static inline int mnt_has_parent(struct mount *mnt)
  58{
  59        return mnt != mnt->mnt_parent;
  60}
  61
  62extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int);
  63
  64static inline void get_mnt_ns(struct mnt_namespace *ns)
  65{
  66        atomic_inc(&ns->count);
  67}
  68
  69struct proc_mounts {
  70        struct seq_file m; /* must be the first element */
  71        struct mnt_namespace *ns;
  72        struct path root;
  73        int (*show)(struct seq_file *, struct vfsmount *);
  74};
  75
  76extern const struct seq_operations mounts_op;
  77
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