Release 4.11 fs/mount.h

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


struct mnt_namespace {
	
atomic_t		count;
	
struct ns_common	ns;
	
struct mount *	root;
	
struct list_head	list;
	
struct user_namespace	*user_ns;
	
struct ucounts		*ucounts;
	
u64			seq;	/* Sequence number to prevent loops */
	
wait_queue_head_t poll;
	
u64 event;
	
unsigned int		mounts; /* # of mounts in the namespace */
	
unsigned int		pending_mounts;
};


struct mnt_pcp {
	
int mnt_count;
	
int mnt_writers;
};


struct mountpoint {
	
struct hlist_node m_hash;
	
struct dentry *m_dentry;
	
struct hlist_head m_list;
	
int m_count;
};


struct mount {
	
struct hlist_node mnt_hash;
	
struct mount *mnt_parent;
	
struct dentry *mnt_mountpoint;
	
struct vfsmount mnt;
	union {
		
struct rcu_head mnt_rcu;
		
struct llist_node mnt_llist;
	};
#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 */
	
struct mountpoint *mnt_mp;	/* where is it mounted */
	
struct hlist_node mnt_mp_list;	/* list mounts with the same mountpoint */
#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 */
	
struct hlist_head mnt_pins;
	
struct fs_pin mnt_umount;
	
struct dentry *mnt_ex_mountpoint;
};


#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);
}

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

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

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

extern int __legitimize_mnt(struct vfsmount *, unsigned);
extern bool legitimize_mnt(struct vfsmount *, unsigned);



static inline bool __path_is_mountpoint(const struct path *path)
{
	struct mount *m = __lookup_mnt(path->mnt, path->dentry);
	return m && likely(!(m->mnt.mnt_flags & MNT_SYNC_UMOUNT));
}

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extern void __detach_mounts(struct dentry *dentry);



static inline void detach_mounts(struct dentry *dentry)
{
	if (!d_mountpoint(dentry))
		return;
	__detach_mounts(dentry);
}

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

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extern seqlock_t mount_lock;



static inline void lock_mount_hash(void)
{
	write_seqlock(&mount_lock);
}

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static inline void unlock_mount_hash(void)
{
	write_sequnlock(&mount_lock);
}

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struct proc_mounts {
	
struct mnt_namespace *ns;
	
struct path root;
	
int (*show)(struct seq_file *, struct vfsmount *);
	
void *cached_mount;
	
u64 cached_event;
	
loff_t cached_index;
};

extern const struct seq_operations mounts_op;

extern bool __is_local_mountpoint(struct dentry *dentry);


static inline bool is_local_mountpoint(struct dentry *dentry)
{
	if (!d_mountpoint(dentry))
		return false;

	return __is_local_mountpoint(dentry);
}
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Directory: fs

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