/*      $NetBSD: linux_fcntl.h,v 1.23 2024/09/28 19:35:56 christos Exp $        */

/*-
* Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Frank van der Linden and Eric Haszlakiewicz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef _LINUX_FCNTL_H
#define _LINUX_FCNTL_H

#ifdef _KERNEL
#include <compat/linux/common/linux_types.h> /* For linux_off_t */
struct stat;
#endif

/*
* The arguments in the flock structure have a different order from the
* BSD structure.
*/

/* read/write mode for open(2) */
#define LINUX_O_RDONLY          0x0000
#define LINUX_O_WRONLY          0x0001
#define LINUX_O_RDWR            0x0002
#define LINUX_O_ACCMODE         0x0003

#define LINUX_AT_FDCWD                  -100
#define LINUX_AT_SYMLINK_NOFOLLOW       0x0100
#define LINUX_AT_REMOVEDIR              0x0200
#define LINUX_AT_SYMLINK_FOLLOW         0x0400
#define LINUX_AT_NO_AUTOMOUNT           0x0800
#define LINUX_AT_EMPTY_PATH             0x1000


/*
* sync_file_range flags
*/
#define LINUX_SYNC_FILE_RANGE_WAIT_BEFORE       1
#define LINUX_SYNC_FILE_RANGE_WRITE             2
#define LINUX_SYNC_FILE_RANGE_WAIT_AFTER        4
#define LINUX_SYNC_FILE_RANGE_ALL       \
   (LINUX_SYNC_FILE_RANGE_WAIT_BEFORE | \
   LINUX_SYNC_FILE_RANGE_WRITE | \
   LINUX_SYNC_FILE_RANGE_WAIT_AFTER)

/*
* renameat2 flags
*/
#define LINUX_RENAME_NOREPLACE  1
#define LINUX_RENAME_EXCHANGE   2
#define LINUX_RENAME_WHITEOUT   4
#define LINUX_RENAME_ALL \
   (LINUX_RENAME_NOREPLACE | \
   LINUX_RENAME_EXCHANGE | \
   LINUX_RENAME_WHITEOUT)

#ifdef _KERNEL
int linux_to_bsd_ioflags(int);
int linux_to_bsd_atflags(int);
int bsd_to_linux_statx(struct stat *, struct linux_statx *, unsigned int);
int linux_statat(struct lwp *, int, const char *, int, struct stat *);

struct linux_flock {
       short       l_type;
       short       l_whence;
       linux_off_t l_start;
       linux_off_t l_len;
       linux_pid_t l_pid;
};

struct linux_flock64 {
       short       l_type;
       short       l_whence;
       off_t       l_start;
       off_t       l_len;
       linux_pid_t l_pid;
};
#endif /* _KERNEL */

#if defined(__i386__)
#include <compat/linux/arch/i386/linux_fcntl.h>
#elif defined(__m68k__)
#include <compat/linux/arch/m68k/linux_fcntl.h>
#elif defined(__alpha__)
#include <compat/linux/arch/alpha/linux_fcntl.h>
#elif defined(__powerpc__)
#include <compat/linux/arch/powerpc/linux_fcntl.h>
#elif defined(__mips__)
#include <compat/linux/arch/mips/linux_fcntl.h>
#elif defined(__aarch64__)
#include <compat/linux/arch/aarch64/linux_fcntl.h>
#elif defined(__arm__)
#include <compat/linux/arch/arm/linux_fcntl.h>
#elif defined(__amd64__)
#include <compat/linux/arch/amd64/linux_fcntl.h>
#else
#error Undefined linux_fcntl.h machine type.
#endif

/* Linux specific fcntl(2) commands */
#define LINUX_F_SPECIFIC_BASE   1024
#define LINUX_F_SETLEASE        (LINUX_F_SPECIFIC_BASE + 0)
#define LINUX_F_GETLEASE        (LINUX_F_SPECIFIC_BASE + 1)
#define LINUX_F_NOTIFY          (LINUX_F_SPECIFIC_BASE + 2)
#define LINUX_F_CANCELLK        (LINUX_F_SPECIFIC_BASE + 5)
#define LINUX_F_DUPFD_CLOEXEC   (LINUX_F_SPECIFIC_BASE + 6)
#define LINUX_F_SETPIPE_SZ      (LINUX_F_SPECIFIC_BASE + 7)
#define LINUX_F_GETPIPE_SZ      (LINUX_F_SPECIFIC_BASE + 8)
#define LINUX_F_ADD_SEALS       (LINUX_F_SPECIFIC_BASE + 9)
#define LINUX_F_GET_SEALS       (LINUX_F_SPECIFIC_BASE + 10)

#ifdef _KERNEL
/*
* We have to have 4 copies of the code that converts linux fcntl() file
* locking to native form because there are 4 layouts for the structures.
* To avoid replicating code, these defines are used.
*
* The next two functions take care of converting the flock
* structure back and forth between Linux and NetBSD format.
* The only difference in the structures is the order and size of
* the fields, and the 'whence' value.
*/

#define conv_linux_flock(LINUX, FLOCK) \
static void \
bsd_to_##LINUX##_##FLOCK(struct LINUX##_##FLOCK *lfp, const struct flock *bfp) \
       copy_flock(lfp, LINUX_F, bfp, F) \
\
static void \
LINUX##_to_bsd_##FLOCK(struct flock *bfp, const struct LINUX##_##FLOCK *lfp) \
       copy_flock(bfp, F, lfp, LINUX_F)

#define copy_flock(dst, dst_f, src, src_f) { \
       dst->l_start = src->l_start; \
       dst->l_len = src->l_len; \
       dst->l_pid = src->l_pid; \
       dst->l_whence = src->l_whence; \
       switch (src->l_type) { \
       case src_f##_RDLCK: \
               dst->l_type = dst_f##_RDLCK; \
               break; \
       case src_f##_UNLCK: \
               dst->l_type = dst_f##_UNLCK; \
               break; \
       case src_f##_WRLCK: \
               dst->l_type = dst_f##_WRLCK; \
               break; \
       default: \
               dst->l_type = -1; \
               break; \
       } \
   }

/*
* These two defines do the work within the sys_fcntl() switch statement.
*/

#define do_linux_getlk(fd, cmd, arg, LINUX, FLOCK) do { \
       struct LINUX##_##FLOCK lfl; \
       struct flock bfl; \
       int fl_error; \
       if ((fl_error = copyin(arg, &lfl, sizeof lfl))) \
               return fl_error; \
       LINUX##_to_bsd_##FLOCK(&bfl, &lfl); \
       fl_error = do_fcntl_lock(fd, F_GETLK, &bfl); \
       if (fl_error) \
               return fl_error; \
       bsd_to_##LINUX##_##FLOCK(&lfl, &bfl); \
       return copyout(&lfl, arg, sizeof lfl); \
   } while (0)

#define do_linux_setlk(fd, cmd, arg, LINUX, FLOCK, setlk) do { \
       struct LINUX##_##FLOCK lfl; \
       struct flock bfl; \
       int fl_error; \
       if ((fl_error = copyin(arg, &lfl, sizeof lfl))) \
               return fl_error; \
       LINUX##_to_bsd_##FLOCK(&bfl, &lfl); \
       return do_fcntl_lock(fd, cmd == setlk ? F_SETLK : F_SETLKW, &bfl); \
   } while (0)
#endif /* _KERNEL */

#endif /* !_LINUX_FCNTL_H */

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