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