btrfs-progs: btrfslabel source code consolidation

Clean btrfslabel.[c|h] out of the source tree and move those related functions to utils.[c|h].

Signed-off-by Jie Liu <[email protected]>

CC David Sterba <[email protected]>

CC Gene Czarcinski <[email protected]>

---
 Makefile          |    4 +-
 btrfslabel.c      |  178 -----------------------------------------------------
 btrfslabel.h      |    5 --
 cmds-filesystem.c |    1 -
 utils.c           |  129 ++++++++++++++++++++++++++++++++++++++
 utils.h           |    2 +
 6 files changed, 133 insertions(+), 186 deletions(-)
 delete mode 100644 btrfslabel.c
 delete mode 100644 btrfslabel.h

Makefile +2 -2

index 4894903..e54b21e 100644
@@ -4,8 +4,8 @@ CFLAGS = -g -O1
 objects = ctree.o disk-io.o radix-tree.o extent-tree.o print-tree.o \
 	  root-tree.o dir-item.o file-item.o inode-item.o \
 	  inode-map.o crc32c.o rbtree.o extent-cache.o extent_io.o \
-	  volumes.o utils.o btrfs-list.o btrfslabel.o repair.o \
-	  send-stream.o send-utils.o qgroup.o
+	  volumes.o utils.o btrfs-list.o repair.o send-stream.o \
+	  send-utils.o qgroup.o
 cmds_objects = cmds-subvolume.o cmds-filesystem.o cmds-device.o cmds-scrub.o \
 	       cmds-inspect.o cmds-balance.o cmds-send.o cmds-receive.o \
 	       cmds-quota.o cmds-qgroup.o

btrfslabel.c deleted +0 -178

deleted file mode 100644
index 2826050..0000000
@@ -1,178 +0,0 @@
-/*
- * Copyright (C) 2008 Morey Roof.   All rights reserved.
- *
- * 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.
- */
-
-#define _GNU_SOURCE
-
-#ifndef __CHECKER__
-#include <sys/ioctl.h>
-#include <sys/mount.h>
-#include "ioctl.h"
-#endif /* __CHECKER__ */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <dirent.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <linux/fs.h>
-#include <linux/limits.h>
-#include <ctype.h>
-#include "kerncompat.h"
-#include "ctree.h"
-#include "utils.h"
-#include "version.h"
-#include "disk-io.h"
-#include "transaction.h"
-
-#define MOUNTED                        1
-#define UNMOUNTED                      2
-#define GET_LABEL                      3
-#define SET_LABEL                      4
-
-static int set_label_unmounted(const char *dev, const char *label)
-{
-	struct btrfs_trans_handle *trans;
-	struct btrfs_root *root;
-	int ret;
-
-	ret = check_mounted(dev);
-	if (ret < 0) {
-	       fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
-	       return -1;
-	}
-	if (ret > 0) {
-		fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
-			dev);
-		return -1;
-	}
-
-	if (strlen(label) > BTRFS_LABEL_SIZE - 1) {
-		fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
-			label, BTRFS_LABEL_SIZE - 1);
-		return -1;
-	}
-
-	/* Open the super_block at the default location
-	 * and as read-write.
-	 */
-	root = open_ctree(dev, 0, 1);
-	if (!root) /* errors are printed by open_ctree() */
-		return -1;
-
-	trans = btrfs_start_transaction(root, 1);
-	snprintf(root->fs_info->super_copy.label, BTRFS_LABEL_SIZE, "%s",
-		 label);
-	btrfs_commit_transaction(trans, root);
-
-	/* Now we close it since we are done. */
-	close_ctree(root);
-	return 0;
-}
-
-static int set_label_mounted(const char *mount_path, const char *label)
-{
-	int fd;
-
-	fd = open(mount_path, O_RDONLY | O_NOATIME);
-	if (fd < 0) {
-		fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
-		return -1;
-	}
-
-	if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
-		fprintf(stderr, "ERROR: unable to set label %s\n",
-			strerror(errno));
-		close(fd);
-		return -1;
-	}
-
-	return 0;
-}
-
-static int get_label_unmounted(const char *dev)
-{
-	struct btrfs_root *root;
-	int ret;
-
-	ret = check_mounted(dev);
-	if (ret < 0) {
-	       fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
-	       return -1;
-	}
-	if (ret > 0) {
-		fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
-			dev);
-		return -1;
-	}
-
-	/* Open the super_block at the default location
-	 * and as read-only.
-	 */
-	root = open_ctree(dev, 0, 0);
-	if(!root)
-		return -1;
-
-	fprintf(stdout, "%s\n", root->fs_info->super_copy.label);
-
-	/* Now we close it since we are done. */
-	close_ctree(root);
-	return 0;
-}
-
-/*
- * If a partition is mounted, try to get the filesystem label via its
- * mounted path rather than device.  Return the corresponding error
- * the user specified the device path.
- */
-static int get_label_mounted(const char *mount_path)
-{
-	char label[BTRFS_LABEL_SIZE];
-	int fd;
-
-	fd = open(mount_path, O_RDONLY | O_NOATIME);
-	if (fd < 0) {
-		fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
-		return -1;
-	}
-
-	memset(label, '\0', sizeof(label));
-	if (ioctl(fd, BTRFS_IOC_GET_FSLABEL, label) < 0) {
-		fprintf(stderr, "ERROR: unable get label %s\n", strerror(errno));
-		close(fd);
-		return -1;
-	}
-
-	fprintf(stdout, "%s\n", label);
-	return 0;
-}
-
-int get_label(const char *btrfs_dev)
-{
-	return is_existing_blk_or_reg_file(btrfs_dev) ?
-		get_label_unmounted(btrfs_dev) :
-		get_label_mounted(btrfs_dev);
-}
-
-int set_label(char *btrfs_dev, char *label)
-{
-	return is_existing_blk_or_reg_file(btrfs_dev) ?
-		set_label_unmounted(btrfs_dev, label) :
-		set_label_mounted(btrfs_dev, label);
-}

btrfslabel.h deleted +0 -5

deleted file mode 100644
index abf43ad..0000000
@@ -1,5 +0,0 @@
-/* btrflabel.h */
-
-
-int get_label(char *btrfs_dev);
-int set_label(char *btrfs_dev, char *nLabel);
\ No newline at end of file

cmds-filesystem.c +0 -1

index 5770d8b..3752703 100644
@@ -32,7 +32,6 @@
 #include "version.h"
 
 #include "commands.h"
-#include "btrfslabel.h"
 
 static const char * const filesystem_cmd_group_usage[] = {
 	"btrfs filesystem [<group>] <command> [<args>]",

utils.c +129 -0

index 034da8f..d65bc35 100644
@@ -16,6 +16,7 @@
  * Boston, MA 021110-1307, USA.
  */
 
+#define _GNU_SOURCE
 #define _XOPEN_SOURCE 600
 #define __USE_XOPEN2K
 #include <stdio.h>

@@ -1144,6 +1145,134 @@ static int check_label(char *input)
        return 0;
 }
 
+static int set_label_unmounted(const char *dev, const char *label)
+{
+	struct btrfs_trans_handle *trans;
+	struct btrfs_root *root;
+	int ret;
+
+	ret = check_mounted(dev);
+	if (ret < 0) {
+	       fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
+	       return -1;
+	}
+	if (ret > 0) {
+		fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
+			dev);
+		return -1;
+	}
+
+	/* Open the super_block at the default location
+	 * and as read-write.
+	 */
+	root = open_ctree(dev, 0, 1);
+	if (!root) /* errors are printed by open_ctree() */
+		return -1;
+
+	trans = btrfs_start_transaction(root, 1);
+	snprintf(root->fs_info->super_copy.label, BTRFS_LABEL_SIZE, "%s",
+		 label);
+	btrfs_commit_transaction(trans, root);
+
+	/* Now we close it since we are done. */
+	close_ctree(root);
+	return 0;
+}
+
+static int set_label_mounted(const char *mount_path, const char *label)
+{
+	int fd;
+
+	fd = open(mount_path, O_RDONLY | O_NOATIME);
+	if (fd < 0) {
+		fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
+		return -1;
+	}
+
+	if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
+		fprintf(stderr, "ERROR: unable to set label %s\n",
+			strerror(errno));
+		close(fd);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int get_label_unmounted(const char *dev)
+{
+	struct btrfs_root *root;
+	int ret;
+
+	ret = check_mounted(dev);
+	if (ret < 0) {
+	       fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
+	       return -1;
+	}
+	if (ret > 0) {
+		fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
+			dev);
+		return -1;
+	}
+
+	/* Open the super_block at the default location
+	 * and as read-only.
+	 */
+	root = open_ctree(dev, 0, 0);
+	if(!root)
+		return -1;
+
+	fprintf(stdout, "%s\n", root->fs_info->super_copy.label);
+
+	/* Now we close it since we are done. */
+	close_ctree(root);
+	return 0;
+}
+
+/*
+ * If a partition is mounted, try to get the filesystem label via its
+ * mounted path rather than device.  Return the corresponding error
+ * the user specified the device path.
+ */
+static int get_label_mounted(const char *mount_path)
+{
+	char label[BTRFS_LABEL_SIZE];
+	int fd;
+
+	fd = open(mount_path, O_RDONLY | O_NOATIME);
+	if (fd < 0) {
+		fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
+		return -1;
+	}
+
+	memset(label, '\0', sizeof(label));
+	if (ioctl(fd, BTRFS_IOC_GET_FSLABEL, label) < 0) {
+		fprintf(stderr, "ERROR: unable get label %s\n", strerror(errno));
+		close(fd);
+		return -1;
+	}
+
+	fprintf(stdout, "%s\n", label);
+	return 0;
+}
+
+int get_label(const char *btrfs_dev)
+{
+	return is_existing_blk_or_reg_file(btrfs_dev) ?
+		get_label_unmounted(btrfs_dev) :
+		get_label_mounted(btrfs_dev);
+}
+
+int set_label(const char *btrfs_dev, const char *label)
+{
+	if (check_label(label))
+		return -1;
+
+	return is_existing_blk_or_reg_file(btrfs_dev) ?
+		set_label_unmounted(btrfs_dev, label) :
+		set_label_mounted(btrfs_dev, label);
+}
+
 int btrfs_scan_block_devices(int run_ioctl)
 {
 

utils.h +0 -0

index a0b782b..632b01c 100644

Quoted 393 lines · Jeff Liu

Clean btrfslabel.[c|h] out of the source tree and move those related functions to utils.[c|h].

Signed-off-by Jie Liu <[email protected]>

CC David Sterba <[email protected]>

CC Gene Czarcinski <[email protected]>

---
 Makefile          |    4 +-
 btrfslabel.c      |  178 -----------------------------------------------------
 btrfslabel.h      |    5 --
 cmds-filesystem.c |    1 -
 utils.c           |  129 ++++++++++++++++++++++++++++++++++++++
 utils.h           |    2 +
 6 files changed, 133 insertions(+), 186 deletions(-)
 delete mode 100644 btrfslabel.c
 delete mode 100644 btrfslabel.h

Makefile +2 -2

index 4894903..e54b21e 100644
@@ -4,8 +4,8 @@ CFLAGS = -g -O1
 objects = ctree.o disk-io.o radix-tree.o extent-tree.o print-tree.o \
 	  root-tree.o dir-item.o file-item.o inode-item.o \
 	  inode-map.o crc32c.o rbtree.o extent-cache.o extent_io.o \
-	  volumes.o utils.o btrfs-list.o btrfslabel.o repair.o \
-	  send-stream.o send-utils.o qgroup.o
+	  volumes.o utils.o btrfs-list.o repair.o send-stream.o \
+	  send-utils.o qgroup.o
 cmds_objects = cmds-subvolume.o cmds-filesystem.o cmds-device.o cmds-scrub.o \
 	       cmds-inspect.o cmds-balance.o cmds-send.o cmds-receive.o \
 	       cmds-quota.o cmds-qgroup.o

btrfslabel.c deleted +0 -178

deleted file mode 100644
index 2826050..0000000
@@ -1,178 +0,0 @@
-/*
- * Copyright (C) 2008 Morey Roof.   All rights reserved.
- *
- * 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.
- */
-
-#define _GNU_SOURCE
-
-#ifndef __CHECKER__
-#include <sys/ioctl.h>
-#include <sys/mount.h>
-#include "ioctl.h"
-#endif /* __CHECKER__ */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <dirent.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <linux/fs.h>
-#include <linux/limits.h>
-#include <ctype.h>
-#include "kerncompat.h"
-#include "ctree.h"
-#include "utils.h"
-#include "version.h"
-#include "disk-io.h"
-#include "transaction.h"
-
-#define MOUNTED                        1
-#define UNMOUNTED                      2
-#define GET_LABEL                      3
-#define SET_LABEL                      4
-
-static int set_label_unmounted(const char *dev, const char *label)
-{
-	struct btrfs_trans_handle *trans;
-	struct btrfs_root *root;
-	int ret;
-
-	ret = check_mounted(dev);
-	if (ret < 0) {
-	       fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
-	       return -1;
-	}
-	if (ret > 0) {
-		fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
-			dev);
-		return -1;
-	}
-
-	if (strlen(label) > BTRFS_LABEL_SIZE - 1) {
-		fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
-			label, BTRFS_LABEL_SIZE - 1);
-		return -1;
-	}
-
-	/* Open the super_block at the default location
-	 * and as read-write.
-	 */
-	root = open_ctree(dev, 0, 1);
-	if (!root) /* errors are printed by open_ctree() */
-		return -1;
-
-	trans = btrfs_start_transaction(root, 1);
-	snprintf(root->fs_info->super_copy.label, BTRFS_LABEL_SIZE, "%s",
-		 label);
-	btrfs_commit_transaction(trans, root);
-
-	/* Now we close it since we are done. */
-	close_ctree(root);
-	return 0;
-}
-
-static int set_label_mounted(const char *mount_path, const char *label)
-{
-	int fd;
-
-	fd = open(mount_path, O_RDONLY | O_NOATIME);
-	if (fd < 0) {
-		fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
-		return -1;
-	}
-
-	if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
-		fprintf(stderr, "ERROR: unable to set label %s\n",
-			strerror(errno));
-		close(fd);
-		return -1;
-	}
-
-	return 0;
-}
-
-static int get_label_unmounted(const char *dev)
-{
-	struct btrfs_root *root;
-	int ret;
-
-	ret = check_mounted(dev);
-	if (ret < 0) {
-	       fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
-	       return -1;
-	}
-	if (ret > 0) {
-		fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
-			dev);
-		return -1;
-	}
-
-	/* Open the super_block at the default location
-	 * and as read-only.
-	 */
-	root = open_ctree(dev, 0, 0);
-	if(!root)
-		return -1;
-
-	fprintf(stdout, "%s\n", root->fs_info->super_copy.label);
-
-	/* Now we close it since we are done. */
-	close_ctree(root);
-	return 0;
-}
-
-/*
- * If a partition is mounted, try to get the filesystem label via its
- * mounted path rather than device.  Return the corresponding error
- * the user specified the device path.
- */
-static int get_label_mounted(const char *mount_path)
-{
-	char label[BTRFS_LABEL_SIZE];
-	int fd;
-
-	fd = open(mount_path, O_RDONLY | O_NOATIME);
-	if (fd < 0) {
-		fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
-		return -1;
-	}
-
-	memset(label, '\0', sizeof(label));
-	if (ioctl(fd, BTRFS_IOC_GET_FSLABEL, label) < 0) {
-		fprintf(stderr, "ERROR: unable get label %s\n", strerror(errno));
-		close(fd);
-		return -1;
-	}
-
-	fprintf(stdout, "%s\n", label);
-	return 0;
-}
-
-int get_label(const char *btrfs_dev)
-{
-	return is_existing_blk_or_reg_file(btrfs_dev) ?
-		get_label_unmounted(btrfs_dev) :
-		get_label_mounted(btrfs_dev);
-}
-
-int set_label(char *btrfs_dev, char *label)
-{
-	return is_existing_blk_or_reg_file(btrfs_dev) ?
-		set_label_unmounted(btrfs_dev, label) :
-		set_label_mounted(btrfs_dev, label);
-}

btrfslabel.h deleted +0 -5

deleted file mode 100644
index abf43ad..0000000
@@ -1,5 +0,0 @@
-/* btrflabel.h */
-
-
-int get_label(char *btrfs_dev);
-int set_label(char *btrfs_dev, char *nLabel);
\ No newline at end of file

cmds-filesystem.c +0 -1

index 5770d8b..3752703 100644
@@ -32,7 +32,6 @@
 #include "version.h"
 
 #include "commands.h"
-#include "btrfslabel.h"
 
 static const char * const filesystem_cmd_group_usage[] = {
 	"btrfs filesystem [<group>] <command> [<args>]",

utils.c +129 -0

index 034da8f..d65bc35 100644
@@ -16,6 +16,7 @@
  * Boston, MA 021110-1307, USA.
  */
 
+#define _GNU_SOURCE
 #define _XOPEN_SOURCE 600
 #define __USE_XOPEN2K
 #include <stdio.h>

@@ -1144,6 +1145,134 @@ static int check_label(char *input)
        return 0;
 }
 
+static int set_label_unmounted(const char *dev, const char *label)
+{
+	struct btrfs_trans_handle *trans;
+	struct btrfs_root *root;
+	int ret;
+
+	ret = check_mounted(dev);
+	if (ret < 0) {
+	       fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
+	       return -1;
+	}
+	if (ret > 0) {
+		fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
+			dev);
+		return -1;
+	}
+
+	/* Open the super_block at the default location
+	 * and as read-write.
+	 */
+	root = open_ctree(dev, 0, 1);
+	if (!root) /* errors are printed by open_ctree() */
+		return -1;
+
+	trans = btrfs_start_transaction(root, 1);
+	snprintf(root->fs_info->super_copy.label, BTRFS_LABEL_SIZE, "%s",
+		 label);
+	btrfs_commit_transaction(trans, root);
+
+	/* Now we close it since we are done. */
+	close_ctree(root);
+	return 0;
+}
+
+static int set_label_mounted(const char *mount_path, const char *label)
+{
+	int fd;
+
+	fd = open(mount_path, O_RDONLY | O_NOATIME);
+	if (fd < 0) {
+		fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
+		return -1;
+	}
+
+	if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
+		fprintf(stderr, "ERROR: unable to set label %s\n",
+			strerror(errno));
+		close(fd);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int get_label_unmounted(const char *dev)
+{
+	struct btrfs_root *root;
+	int ret;
+
+	ret = check_mounted(dev);
+	if (ret < 0) {
+	       fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
+	       return -1;
+	}
+	if (ret > 0) {
+		fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
+			dev);
+		return -1;
+	}
+
+	/* Open the super_block at the default location
+	 * and as read-only.
+	 */
+	root = open_ctree(dev, 0, 0);
+	if(!root)
+		return -1;
+
+	fprintf(stdout, "%s\n", root->fs_info->super_copy.label);
+
+	/* Now we close it since we are done. */
+	close_ctree(root);
+	return 0;
+}
+
+/*
+ * If a partition is mounted, try to get the filesystem label via its
+ * mounted path rather than device.  Return the corresponding error
+ * the user specified the device path.
+ */
+static int get_label_mounted(const char *mount_path)
+{
+	char label[BTRFS_LABEL_SIZE];
+	int fd;
+
+	fd = open(mount_path, O_RDONLY | O_NOATIME);
+	if (fd < 0) {
+		fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
+		return -1;
+	}
+
+	memset(label, '\0', sizeof(label));
+	if (ioctl(fd, BTRFS_IOC_GET_FSLABEL, label) < 0) {
+		fprintf(stderr, "ERROR: unable get label %s\n", strerror(errno));
+		close(fd);
+		return -1;
+	}
+
+	fprintf(stdout, "%s\n", label);
+	return 0;
+}
+
+int get_label(const char *btrfs_dev)
+{
+	return is_existing_blk_or_reg_file(btrfs_dev) ?
+		get_label_unmounted(btrfs_dev) :
+		get_label_mounted(btrfs_dev);
+}
+
+int set_label(const char *btrfs_dev, const char *label)
+{
+	if (check_label(label))
+		return -1;
+
+	return is_existing_blk_or_reg_file(btrfs_dev) ?
+		set_label_unmounted(btrfs_dev, label) :
+		set_label_mounted(btrfs_dev, label);
+}
+
 int btrfs_scan_block_devices(int run_ioctl)
 {
 

utils.h +0 -0

index a0b782b..632b01c 100644
@@ -46,4 +46,6 @@ int get_mountpt(char *dev, char *mntpt, size_t size);
 

utils.h int get_mountpt(char *dev, char *mntpt, size_t size); · line 51

Quoted 6 lines

utils.h +2 -0

 int btrfs_scan_block_devices(int run_ioctl);
 int is_existing_blk_or_reg_file(const char* filename);
+int get_label(const char *btrfs_dev);
+int set_label(const char *btrfs_dev, const char *label);
 #endif

Jeff, You moved everything except for the copyright text and finally deleted the file with the copyright text.
Shouldn't you add this text to util.c as well?

Something like this (the Oracle text was already present in utils.c, and the Morey Roof text is taken from utils.c, the license was equal in both files):
/*
* Copyright (C) 2007 Oracle. All rights reserved.
* Copyright (C) 2008 Morey Roof. All rights reserved.
*
* This program is free software; you can redistribute it and/or
...

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utils.c +3 -2

@@ -1122,17 +1122,21 @@ char *pretty_sizes(u64 size)
       -1    if the label is too long
       -2    if the label contains an invalid character
  */
-int check_label(char *input)
+static int check_label(char *input)
 {
        int i;
        int len = strlen(input);
 
-       if (len > BTRFS_LABEL_SIZE) {
+       if (len > BTRFS_LABEL_SIZE - 1) {
+		fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",

Quoted 15 lines · Jeff Liu

utils.c +3 -2

@@ -1122,17 +1122,21 @@ char *pretty_sizes(u64 size)
       -1    if the label is too long
       -2    if the label contains an invalid character
  */
-int check_label(char *input)
+static int check_label(char *input)
 {
        int i;
        int len = strlen(input);
 
-       if (len > BTRFS_LABEL_SIZE) {
+       if (len > BTRFS_LABEL_SIZE - 1) {
+		fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",

utils.c char *pretty_sizes(u64 size) · line 1141

Quoted 10 lines

utils.c +3 -0

+			input, BTRFS_LABEL_SIZE - 1);
                return -1;
        }
 
        for (i = 0; i < len; i++) {
                if (input[i] == '/' || input[i] == '\\') {
+			fprintf(stderr, "ERROR: Label %s contains invalid "
+				"characters\n", input);
                        return -2;
                }

Plase drop this check, see
http://repo.or.cz/w/btrfs-progs-unstable/devel.git/commit/79e0e445fc2365e47fc7f060d5a4445d37e184b8
(also function comment and maybe the callers)

"btrfs-progs: kill check for /'s in labels

This patch kills a check in mkfs's label stuff which doesn't allow labels that have /'s in them. This causes problems for Anaconda which try to label volumes with their mountpoints."
(mkfs.c)