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-rw-r--r--utils.c130
1 files changed, 130 insertions, 0 deletions
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)
{