mount.h

Go to the documentation of this file.

#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/poll.h>

struct mnt_namespace {
    atomic_t        count;
    struct mount *  root;
    struct list_head    list;
    wait_queue_head_t poll;
    int event;
};

struct mnt_pcp {
    int mnt_count;
    int mnt_writers;
};

struct mount {
    struct list_head mnt_hash;
    struct mount *mnt_parent;
    struct dentry *mnt_mountpoint;
    struct vfsmount mnt;
#ifdef CONFIG_SMP
    struct mnt_pcp __percpu *mnt_pcp;
#else
    int mnt_count;
    int mnt_writers;
#endif
    struct list_head mnt_mounts;    /* list of children, anchored here */
    struct list_head mnt_child; /* and going through their mnt_child */
    struct list_head mnt_instance;  /* mount instance on sb->s_mounts */
    const char *mnt_devname;    /* Name of device e.g. /dev/dsk/hda1 */
    struct list_head mnt_list;
    struct list_head mnt_expire;    /* link in fs-specific expiry list */
    struct list_head mnt_share; /* circular list of shared mounts */
    struct list_head mnt_slave_list;/* list of slave mounts */
    struct list_head mnt_slave; /* slave list entry */
    struct mount *mnt_master;   /* slave is on master->mnt_slave_list */
    struct mnt_namespace *mnt_ns;   /* containing namespace */
#ifdef CONFIG_FSNOTIFY
    struct hlist_head mnt_fsnotify_marks;
    __u32 mnt_fsnotify_mask;
#endif
    int mnt_id;         /* mount identifier */
    int mnt_group_id;       /* peer group identifier */
    int mnt_expiry_mark;        /* true if marked for expiry */
    int mnt_pinned;
    int mnt_ghosts;
};

#define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */

static inline struct mount *real_mount(struct vfsmount *mnt)
{
    return container_of(mnt, struct mount, mnt);
}

static inline int mnt_has_parent(struct mount *mnt)
{
    return mnt != mnt->mnt_parent;
}

static inline int is_mounted(struct vfsmount *mnt)
{
    /* neither detached nor internal? */
    return !IS_ERR_OR_NULL(real_mount(mnt));
}

extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int);

static inline void get_mnt_ns(struct mnt_namespace *ns)
{
    atomic_inc(&ns->count);
}

struct proc_mounts {
    struct seq_file m;
    struct mnt_namespace *ns;
    struct path root;
    int (*show)(struct seq_file *, struct vfsmount *);
};

#define proc_mounts(p) (container_of((p), struct proc_mounts, m))

extern const struct seq_operations mounts_op;