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#ifndef _LINUX_FANOTIFY_H

#define _LINUX_FANOTIFY_H

#include <linux/types.h>

/* the following events that user-space can register for */

#define FAN_ACCESS              0x00000001      /* File was accessed */

#define FAN_MODIFY              0x00000002      /* File was modified */

#define FAN_CLOSE_WRITE         0x00000008      /* Writtable file closed */

#define FAN_CLOSE_NOWRITE       0x00000010      /* Unwrittable file closed */

#define FAN_OPEN                0x00000020      /* File was opened */

#define FAN_Q_OVERFLOW          0x00004000      /* Event queued overflowed */

#define FAN_OPEN_PERM           0x00010000      /* File open in perm check */

#define FAN_ACCESS_PERM         0x00020000      /* File accessed in perm check */

#define FAN_ONDIR               0x40000000      /* event occurred against dir */

#define FAN_EVENT_ON_CHILD      0x08000000      /* interested in child events */

/* helper events */

#define FAN_CLOSE               (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */

/* flags used for fanotify_init() */

#define FAN_CLOEXEC             0x00000001

#define FAN_NONBLOCK            0x00000002

/* These are NOT bitwise flags.  Both bits are used togther.  */

#define FAN_CLASS_NOTIF         0x00000000

#define FAN_CLASS_CONTENT       0x00000004

#define FAN_CLASS_PRE_CONTENT   0x00000008

#define FAN_ALL_CLASS_BITS      (FAN_CLASS_NOTIF | FAN_CLASS_CONTENT | \

                                 FAN_CLASS_PRE_CONTENT)

#define FAN_UNLIMITED_QUEUE     0x00000010

#define FAN_UNLIMITED_MARKS     0x00000020

#define FAN_ALL_INIT_FLAGS      (FAN_CLOEXEC | FAN_NONBLOCK | \

                                 FAN_ALL_CLASS_BITS | FAN_UNLIMITED_QUEUE |\

                                 FAN_UNLIMITED_MARKS)

/* flags used for fanotify_modify_mark() */

#define FAN_MARK_ADD            0x00000001

#define FAN_MARK_REMOVE         0x00000002

#define FAN_MARK_DONT_FOLLOW    0x00000004

#define FAN_MARK_ONLYDIR        0x00000008

#define FAN_MARK_MOUNT          0x00000010

#define FAN_MARK_IGNORED_MASK   0x00000020

#define FAN_MARK_IGNORED_SURV_MODIFY    0x00000040

#define FAN_MARK_FLUSH          0x00000080

#define FAN_ALL_MARK_FLAGS      (FAN_MARK_ADD |\

                                 FAN_MARK_REMOVE |\

                                 FAN_MARK_DONT_FOLLOW |\

                                 FAN_MARK_ONLYDIR |\

                                 FAN_MARK_MOUNT |\

                                 FAN_MARK_IGNORED_MASK |\

                                 FAN_MARK_IGNORED_SURV_MODIFY |\

                                 FAN_MARK_FLUSH)

/*

 * All of the events - we build the list by hand so that we can add flags in

 * the future and not break backward compatibility.  Apps will get only the

 * events that they originally wanted.  Be sure to add new events here!

 */

#define FAN_ALL_EVENTS (FAN_ACCESS |\

                        FAN_MODIFY |\

                        FAN_CLOSE |\

                        FAN_OPEN)

/*

 * All events which require a permission response from userspace

 */

#define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\

                             FAN_ACCESS_PERM)

#define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\

                                 FAN_ALL_PERM_EVENTS |\

                                 FAN_Q_OVERFLOW)

#define FANOTIFY_METADATA_VERSION       3

struct fanotify_event_metadata {

        __u32 event_len;

        __u8 vers;

        __u8 reserved;

        __u16 metadata_len;

        __aligned_u64 mask;

        __s32 fd;

        __s32 pid;

};

struct fanotify_response {

        __s32 fd;

        __u32 response;

};

/* Legit userspace responses to a _PERM event */

#define FAN_ALLOW       0x01

#define FAN_DENY        0x02

/* No fd set in event */

#define FAN_NOFD        -1

/* Helper functions to deal with fanotify_event_metadata buffers */

#define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata))

#define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \

                                   (struct fanotify_event_metadata*)(((char *)(meta)) + \

                                   (meta)->event_len))

#define FAN_EVENT_OK(meta, len) ((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \

                                (long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \

                                (long)(meta)->event_len <= (long)(len))

#endif /* _LINUX_FANOTIFY_H */