Btrfs-progs: move open_file_or_dir() to utils.c

The definition of the function open_file_or_dir() is moved from common.c
to utils.c in order to be able to share some common code between scrub
and the device stats in the following step. That common code uses
open_file_or_dir(). Since open_file_or_dir() makes use of the function
dirfd(3), the required XOPEN version was raised from 6 to 7.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Original-Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>

Makefile

@@ -57,9 +57,9 @@ all: version $(progs) manpages
 version:
 	$(Q)bash version.sh
 
-btrfs: $(objects) btrfs.o help.o common.o $(cmds_objects)
+btrfs: $(objects) btrfs.o help.o $(cmds_objects)
 	@echo "    [LD]     $@"
-	$(Q)$(CC) $(CFLAGS) -o btrfs btrfs.o help.o common.o $(cmds_objects) \
+	$(Q)$(CC) $(CFLAGS) -o btrfs btrfs.o help.o $(cmds_objects) \
 		$(objects) $(LDFLAGS) $(LIBS) -lpthread
 
 calc-size: $(objects) calc-size.o

btrfsctl.c

@@ -63,7 +63,7 @@ static void print_usage(void)
 	exit(1);
 }
 
-static int open_file_or_dir(const char *fname)
+static int btrfsctl_open_file_or_dir(const char *fname)
 {
 	int ret;
 	struct stat st;
@@ -91,6 +91,7 @@ static int open_file_or_dir(const char *fname)
 	}
 	return fd;
 }
+
 int main(int ac, char **av)
 {
 	char *fname = NULL;
@@ -128,7 +129,7 @@ int main(int ac, char **av)
 			snap_location = strdup(fullpath);
 			snap_location = dirname(snap_location);
 
-			snap_fd = open_file_or_dir(snap_location);
+			snap_fd = btrfsctl_open_file_or_dir(snap_location);
 
 			name = strdup(fullpath);
 			name = basename(name);
@@ -238,7 +239,7 @@ int main(int ac, char **av)
 		}
 		name = fname;
 	 } else {
-		fd = open_file_or_dir(fname);
+		fd = btrfsctl_open_file_or_dir(fname);
 	 }
 
 	if (name) {

cmds-balance.c

@@ -28,6 +28,7 @@
 #include "volumes.h"
 
 #include "commands.h"
+#include "utils.h"
 
 static const char * const balance_cmd_group_usage[] = {
 	"btrfs [filesystem] balance <command> [options] <path>",

cmds-inspect.c

@@ -23,6 +23,7 @@
 
 #include "kerncompat.h"
 #include "ioctl.h"
+#include "utils.h"
 
 #include "commands.h"
 #include "btrfs-list.h"

cmds-qgroup.c

@@ -25,6 +25,7 @@
 
 #include "commands.h"
 #include "qgroup.h"
+#include "utils.h"
 
 static const char * const qgroup_cmd_group_usage[] = {
 	"btrfs qgroup <command> [options] <path>",

cmds-quota.c

@@ -23,6 +23,7 @@
 #include "ioctl.h"
 
 #include "commands.h"
+#include "utils.h"
 
 static const char * const quota_cmd_group_usage[] = {
 	"btrfs quota <command> [options] <path>",

cmds-subvolume.c

@@ -32,6 +32,7 @@
 #include "ctree.h"
 #include "commands.h"
 #include "btrfs-list.h"
+#include "utils.h"
 
 static const char * const subvolume_cmd_group_usage[] = {
 	"btrfs subvolume <command> <args>",

commands.h

@@ -79,9 +79,6 @@ void help_ambiguous_token(const char *arg, const struct cmd_group *grp);
 
 void help_command_group(const struct cmd_group *grp, int argc, char **argv);
 
-/* common.c */
-int open_file_or_dir(const char *fname);
-
 extern const struct cmd_group subvolume_cmd_group;
 extern const struct cmd_group filesystem_cmd_group;
 extern const struct cmd_group balance_cmd_group;

common.c

@@ -1,46 +0,0 @@
-/*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License v2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <dirent.h>
-#include <fcntl.h>
-
-int open_file_or_dir(const char *fname)
-{
-	int ret;
-	struct stat st;
-	DIR *dirstream;
-	int fd;
-
-	ret = stat(fname, &st);
-	if (ret < 0) {
-		return -1;
-	}
-	if (S_ISDIR(st.st_mode)) {
-		dirstream = opendir(fname);
-		if (!dirstream) {
-			return -2;
-		}
-		fd = dirfd(dirstream);
-	} else {
-		fd = open(fname, O_RDWR);
-	}
-	if (fd < 0) {
-		return -3;
-	}
-	return fd;
-}

utils.c

@@ -16,8 +16,9 @@
  * Boston, MA 021110-1307, USA.
  */
 
-#define _XOPEN_SOURCE 600
-#define __USE_XOPEN2K
+#define _XOPEN_SOURCE 700
+#define __USE_XOPEN2K8
+#define __XOPEN2K8 /* due to an error in dirent.h, to get dirfd() */
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -1276,3 +1277,28 @@ u64 parse_size(char *s)
 	return strtoull(s, NULL, 10) * mult;
 }
 
+int open_file_or_dir(const char *fname)
+{
+	int ret;
+	struct stat st;
+	DIR *dirstream;
+	int fd;
+
+	ret = stat(fname, &st);
+	if (ret < 0) {
+		return -1;
+	}
+	if (S_ISDIR(st.st_mode)) {
+		dirstream = opendir(fname);
+		if (!dirstream) {
+			return -2;
+		}
+		fd = dirfd(dirstream);
+	} else {
+		fd = open(fname, O_RDWR);
+	}
+	if (fd < 0) {
+		return -3;
+	}
+	return fd;
+}

utils.h

@@ -19,6 +19,8 @@
 #ifndef __UTILS__
 #define __UTILS__
 
+#include "ctree.h"
+
 #define BTRFS_MKFS_SYSTEM_GROUP_SIZE (4 * 1024 * 1024)
 
 int make_btrfs(int fd, const char *device, const char *label,
@@ -44,8 +46,7 @@ int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
 char *pretty_sizes(u64 size);
 int check_label(char *input);
 int get_mountpt(char *dev, char *mntpt, size_t size);
-
 int btrfs_scan_block_devices(int run_ioctl);
-
 u64 parse_size(char *s);
+int open_file_or_dir(const char *fname);
 #endif