btrfs-progs: move btrfslabel.[c|h] stuff to utils.[c|h]

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

CC: Gene Czarcinski <gene@czarc.net>
Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.cz>

6 files changed, 133 insertions, 161 deletions

diff --git a/Makefile b/Makefile
index bea8ae96..b1bd7c25 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ 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 \
+	  volumes.o utils.o btrfs-list.o repair.o \
 	  send-stream.o send-utils.o qgroup.o raid6.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 \
diff --git a/btrfslabel.c b/btrfslabel.c
deleted file mode 100644
index dcc776e5..00000000
--- a/btrfslabel.c
+++ /dev/null
@@ -1,154 +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;
-}
-
-int get_label_unmounted(char *dev)
-{
-       struct btrfs_root *root;
-
-       /* 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;
-}
-
-int get_label(char *btrfs_dev)
-{
-
-	int ret;
-	ret = check_mounted(btrfs_dev);
-	if (ret < 0)
-	{
-	       fprintf(stderr, "FATAL: error checking %s mount status\n", btrfs_dev);
-	       return -1;
-	}
-
-	if(ret != 0)
-	{
-	       fprintf(stderr, "FATAL: the filesystem has to be unmounted\n");
-	       return -2;
-	}
-	ret = get_label_unmounted(btrfs_dev);
-	return ret;
-}
-
-
-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);
-}
diff --git a/btrfslabel.h b/btrfslabel.h
deleted file mode 100644
index abf43ad8..00000000
--- a/btrfslabel.h
+++ /dev/null
@@ -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
diff --git a/cmds-filesystem.c b/cmds-filesystem.c
index 6e0a1cfe..22100202 100644
--- a/cmds-filesystem.c
+++ b/cmds-filesystem.c
@@ -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>]",
diff --git a/utils.c b/utils.c
index 50e54532..ac3c053e 100644
--- a/utils.c
+++ b/utils.c
@@ -1,5 +1,6 @@
 /*
  * 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
  * modify it under the terms of the GNU General Public
@@ -19,6 +20,7 @@
 #define _XOPEN_SOURCE 700
 #define __USE_XOPEN2K8
 #define __XOPEN2K8 /* due to an error in dirent.h, to get dirfd() */
+#define _GNU_SOURCE	/* O_NOATIME */
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -1164,6 +1166,134 @@ static int check_label(const 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)
 {
 
diff --git a/utils.h b/utils.h
index cadb1cb9..0b681ed3 100644
--- a/utils.h
+++ b/utils.h
@@ -52,6 +52,8 @@ int get_device_info(int fd, u64 devid,
 		    struct btrfs_ioctl_dev_info_args *di_args);
 int get_fs_info(int fd, char *path, struct btrfs_ioctl_fs_info_args *fi_args,
 		struct btrfs_ioctl_dev_info_args **di_ret);
+int get_label(const char *btrfs_dev);
+int set_label(const char *btrfs_dev, const char *label);
 
 char *__strncpy__null(char *dest, const char *src, size_t n);
 int is_swap_device(const char *file);