Add rescue command to zero the log

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/Makefile b/Makefile
index 5178343..6e6f6c6 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -59,6 +59,9 @@ mkfs.btrfs: $(objects) mkfs.o
 btrfs-debug-tree: $(objects) debug-tree.o
        gcc $(CFLAGS) -o btrfs-debug-tree $(objects) debug-tree.o $(LDFLAGS) $(LIBS)
 
+btrfs-zero-log: $(objects) btrfs-zero-log.o
+       gcc $(CFLAGS) -o btrfs-zero-log $(objects) btrfs-zero-log.o $(LDFLAGS) $(LIBS)
+
 btrfstune: $(objects) btrfstune.o
        gcc $(CFLAGS) -o btrfstune $(objects) btrfstune.o $(LDFLAGS) $(LIBS)
 

diff --git a/btrfs-zero-log.c b/btrfs-zero-log.c
new file mode 100644 (file)
index 0000000..f10438b
--- /dev/null
+++ b/btrfs-zero-log.c
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2007 Oracle.  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 _XOPEN_SOURCE 500
+#define _GNU_SOURCE 1
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include "kerncompat.h"
+#include "ctree.h"
+#include "disk-io.h"
+#include "print-tree.h"
+#include "transaction.h"
+#include "list.h"
+#include "version.h"
+#include "utils.h"
+
+static void print_usage(void)
+{
+       fprintf(stderr, "usage: btrfs-zero-log dev\n");
+       fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);
+       exit(1);
+}
+
+int main(int ac, char **av)
+{
+       struct btrfs_root *root;
+       int ret;
+
+       if (ac != 2)
+               print_usage();
+
+       radix_tree_init();
+
+       if((ret = check_mounted(av[1])) < 0) {
+               fprintf(stderr, "Could not check mount status: %s\n", strerror(ret));
+               return ret;
+       } else if(ret) {
+               fprintf(stderr, "%s is currently mounted. Aborting.\n", av[1]);
+               return -EBUSY;
+       }
+
+       root = open_ctree(av[1], 0, 1);
+
+       if (root == NULL)
+               return 1;
+
+       btrfs_set_super_log_root(&root->fs_info->super_copy, 0);
+       btrfs_set_super_log_root_level(&root->fs_info->super_copy, 0);
+       close_ctree(root);
+       return ret;
+}