basic: Remove assertions from missing_fs.h

These assertions impose an include order between <linux/fs.h> and
"missing_fs.h", specifically <linux/fs.h> can't be included before
"missing_fs.h". This makes automated include refactoring very painful,
so let's get rid of these assertions and instead assume that linux/fs.h
does the right thing.

Author: DaanDeMeyer

src/basic/missing_fs.h

@@ -1,50 +1,8 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 #pragma once
 
-/* temporary undef definitions in bits/uio-ext.h, which is included by sys/uio.h */
-#include <sys/uio.h>
-
-#define __RWF_HIPRI_SAVED__     RWF_HIPRI
-#undef RWF_HIPRI
-#define __RWF_DSYNC_SAVED__     RWF_DSYNC
-#undef RWF_DSYNC
-#define __RWF_SYNC_SAVED__      RWF_SYNC
-#undef RWF_SYNC
-#define __RWF_NOWAIT_SAVED__    RWF_NOWAIT
-#undef RWF_NOWAIT
-#define __RWF_APPEND_SAVED__    RWF_APPEND
-#undef RWF_APPEND
-#define __RWF_NOAPPEND_SAVED__  RWF_NOAPPEND
-#undef RWF_NOAPPEND
-#if defined(RWF_ATOMIC)
-#define __RWF_ATOMIC_SAVED__    RWF_ATOMIC
-#undef RWF_ATOMIC
-#else
-#define __RWF_ATOMIC_SAVED__    0x00000040
-#endif
-#if defined(RWF_DONTCACHE)
-#define __RWF_DONTCACHE_SAVED__ RWF_DONTCACHE
-#undef RWF_DONTCACHE
-#else
-#define __RWF_DONTCACHE_SAVED__ 0x00000080
-#endif
-
-#include <linux/btrfs.h>
-#include <linux/btrfs_tree.h>
 #include <linux/fs.h>
 
-#include "macro.h"
-
-/* check RWF_xyz are redefined by linux/fs.h */
-assert_cc(RWF_HIPRI     == __RWF_HIPRI_SAVED__);
-assert_cc(RWF_DSYNC     == __RWF_DSYNC_SAVED__);
-assert_cc(RWF_SYNC      == __RWF_SYNC_SAVED__);
-assert_cc(RWF_NOWAIT    == __RWF_NOWAIT_SAVED__);
-assert_cc(RWF_APPEND    == __RWF_APPEND_SAVED__);
-assert_cc(RWF_NOAPPEND  == __RWF_NOAPPEND_SAVED__);
-assert_cc(RWF_ATOMIC    == __RWF_ATOMIC_SAVED__);
-assert_cc(RWF_DONTCACHE == __RWF_DONTCACHE_SAVED__);
-
 /* Not exposed yet. Defined at fs/ext4/ext4.h */
 #ifndef EXT4_IOC_RESIZE_FS
 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)

src/shared/btrfs-util.c

@@ -3,6 +3,8 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>
+#include <linux/btrfs.h>
+#include <linux/btrfs_tree.h>
 #include <linux/loop.h>
 #include <linux/magic.h>
 #include <stddef.h>

src/shared/copy.c

@@ -2,6 +2,7 @@
 
 #include <errno.h>
 #include <fcntl.h>
+#include <linux/btrfs.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>

src/shared/resize-fs.c

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
+#include <linux/btrfs.h>
 #include <linux/magic.h>
 #include <sys/ioctl.h>
 #include <sys/vfs.h>

src/udev/udev-builtin-btrfs.c

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include <fcntl.h>
+#include <linux/btrfs.h>
 #include <stdlib.h>
 #include <sys/ioctl.h>