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/*
* Directory notification for Linux
*
* Copyright 2000 (C) Stephen Rothwell
*/
#include <linux/fs.h>
struct dnotify_struct {
struct dnotify_struct * dn_next;
int dn_magic;
unsigned long dn_mask; /* Events to be notified
see linux/fcntl.h */
int dn_fd;
struct file * dn_filp;
fl_owner_t dn_owner;
};
#define DNOTIFY_MAGIC 0x444E4F54
extern void __inode_dir_notify(struct inode *, unsigned long);
extern int fcntl_dirnotify(int, struct file *, unsigned long);
static inline void inode_dir_notify(struct inode *inode, unsigned long event)
{
if ((inode)->i_dnotify_mask & (event))
__inode_dir_notify(inode, event);
}
/*
* This is hopelessly wrong, but unfixable without API changes. At
* least it doesn't oops the kernel...
*/
static inline void dnotify_parent(struct dentry *dentry, unsigned long event)
{
struct dentry *parent;
read_lock(&dparent_lock);
parent = dentry->d_parent;
if (parent->d_inode->i_dnotify_mask & event) {
dget(parent);
read_unlock(&dparent_lock);
__inode_dir_notify(parent->d_inode, event);
dput(parent);
} else
read_unlock(&dparent_lock);
}
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