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