btrfs-progs: remove unnecessary linux/*.h includes

Decrease dependency on system headers, remove where they're not needed
or became stale after code moved. The path-utils.h encapsulate path
operations so include linux/limits.h here, that's where PATH_MAX is
defined.

Signed-off-by: David Sterba <dsterba@suse.com>

cmds/filesystem.c

@@ -25,7 +25,6 @@
 #include <fcntl.h>
 #include <ftw.h>
 #include <mntent.h>
-#include <linux/limits.h>
 #include <linux/version.h>
 #include <getopt.h>
 #include <limits.h>

cmds/subvolume.c

@@ -27,7 +27,6 @@
 #include <limits.h>
 #include <getopt.h>
 #include <uuid/uuid.h>
-#include <linux/magic.h>
 
 #include <btrfsutil.h>
 

common/device-scan.c

@@ -23,7 +23,6 @@
 #include <unistd.h>
 #include <errno.h>
 #include <dirent.h>
-#include <linux/limits.h>
 #include <blkid/blkid.h>
 #include <uuid/uuid.h>
 #include "kernel-lib/overflow.h"

common/path-utils.h

@@ -18,6 +18,7 @@
 #define __BTRFS_PATH_UTILS_H__
 
 #include <sys/types.h>
+#include <linux/limits.h>
 
 char *path_canonicalize_dm_name(const char *ptname);
 char *path_canonicalize(const char *path);

common/utils.c

@@ -30,9 +30,6 @@
 #include <unistd.h>
 #include <mntent.h>
 #include <ctype.h>
-#include <linux/loop.h>
-#include <linux/major.h>
-#include <linux/kdev_t.h>
 #include <limits.h>
 #include <blkid/blkid.h>
 #include <sys/vfs.h>

convert/source-fs.h

@@ -18,8 +18,6 @@
 #define __BTRFS_CONVERT_SOURCE_FS_H__
 
 #include "kerncompat.h"
-#include <linux/kdev_t.h>
-#include <sys/types.h>
 #include <pthread.h>
 #include <sys/types.h>
 

convert/source-reiserfs.c

@@ -17,7 +17,6 @@
 #if BTRFSCONVERT_REISERFS
 
 #include "kerncompat.h"
-#include <linux/limits.h>
 #include <linux/fs.h>
 #include <limits.h>
 #include <sys/stat.h>

kernel-lib/bitops.h

@@ -1,7 +1,6 @@
 #ifndef _PERF_LINUX_BITOPS_H_
 #define _PERF_LINUX_BITOPS_H_
 
-#include <linux/kernel.h>
 #include <endian.h>
 #include "common/internal.h"
 

kernel-shared/zoned.c

@@ -1,7 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 
 #include <sys/ioctl.h>
-#include <linux/fs.h>
 #include <unistd.h>
 
 #include "kernel-lib/list.h"