/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/fsnotify_backend.h>
#include <linux/inotify.h>
#include <linux/slab.h> /* struct kmem_cache */

struct inotify_event_info {
        struct fsnotify_event fse;
        u32 mask;
        int wd;
        u32 sync_cookie;
        int name_len;
        char name[];
};

struct inotify_inode_mark {
        struct fsnotify_mark fsn_mark;
        int wd;
};

static inline struct inotify_event_info *INOTIFY_E(struct fsnotify_event *fse)
{
        return container_of(fse, struct inotify_event_info, fse);
}

/*
 * INOTIFY_USER_FLAGS represents all of the mask bits that we expose to
 * userspace.  There is at least one bit (FS_EVENT_ON_CHILD) which is
 * used only internally to the kernel.
 */
#define INOTIFY_USER_MASK (IN_ALL_EVENTS)

static inline __u32 inotify_mark_user_mask(struct fsnotify_mark *fsn_mark)
{
        __u32 mask = fsn_mark->mask & INOTIFY_USER_MASK;

        if (fsn_mark->flags & FSNOTIFY_MARK_FLAG_EXCL_UNLINK)
                mask |= IN_EXCL_UNLINK;
        if (fsn_mark->flags & FSNOTIFY_MARK_FLAG_IN_ONESHOT)
                mask |= IN_ONESHOT;

        return mask;
}

extern void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark,
                                           struct fsnotify_group *group);
extern int inotify_handle_inode_event(struct fsnotify_mark *inode_mark,
                                      u32 mask, struct inode *inode,
                                      struct inode *dir,
                                      const struct qstr *name, u32 cookie);

extern const struct fsnotify_ops inotify_fsnotify_ops;
extern struct kmem_cache *inotify_inode_mark_cachep;

#ifdef CONFIG_INOTIFY_USER
static inline void dec_inotify_instances(struct ucounts *ucounts)
{
        dec_ucount(ucounts, UCOUNT_INOTIFY_INSTANCES);
}

static inline struct ucounts *inc_inotify_watches(struct ucounts *ucounts)
{
        return inc_ucount(ucounts->ns, ucounts->uid, UCOUNT_INOTIFY_WATCHES);
}

static inline void dec_inotify_watches(struct ucounts *ucounts)
{
        dec_ucount(ucounts, UCOUNT_INOTIFY_WATCHES);
}
#endif