btrfs-progs: corrupt block: handle block mapping errors in debug_corrupt_block

Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/btrfs-corrupt-block.c b/btrfs-corrupt-block.c
index f2cc42c..86d4d0b 100644 (file)
--- a/btrfs-corrupt-block.c
+++ b/btrfs-corrupt-block.c
@@ -34,7 +34,7 @@
 
 #define FIELD_BUF_LEN 80
 
-static void debug_corrupt_block(struct extent_buffer *eb,
+static int debug_corrupt_block(struct extent_buffer *eb,
                struct btrfs_root *root, u64 bytenr, u32 blocksize, u64 copy)
 {
        int ret;
@@ -49,7 +49,13 @@ static void debug_corrupt_block(struct extent_buffer *eb,
                ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
                                      eb->start, &length, &multi,
                                      mirror_num, NULL);
-               BUG_ON(ret);
+               if (ret) {
+                       error("cannot map block %llu length %llu mirror %d: %d",
+                                       (unsigned long long)eb->start,
+                                       (unsigned long long)length,
+                                       mirror_num, ret);
+                       return ret;
+               }
                device = multi->stripes[0].dev;
                eb->fd = device->fd;
                device->total_ios++;
@@ -79,6 +85,8 @@ static void debug_corrupt_block(struct extent_buffer *eb,
                if (mirror_num > num_copies)
                        break;
        }
+
+       return 0;
 }
 
 static void print_usage(int ret)