diff options
Diffstat (limited to 'btrfs-map-logical.c')
-rw-r--r-- | btrfs-map-logical.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/btrfs-map-logical.c b/btrfs-map-logical.c index 8442779b..22ece82e 100644 --- a/btrfs-map-logical.c +++ b/btrfs-map-logical.c @@ -93,6 +93,69 @@ out: return ret; } +static int __print_mapping_info(struct btrfs_fs_info *fs_info, u64 logical, + u64 len, int mirror_num) +{ + struct btrfs_multi_bio *multi = NULL; + u64 cur_offset = 0; + u64 cur_len; + int ret = 0; + + while (cur_offset < len) { + struct btrfs_device *device; + int i; + + cur_len = len - cur_offset; + ret = btrfs_map_block(&fs_info->mapping_tree, READ, + logical + cur_offset, &cur_len, + &multi, mirror_num, NULL); + if (ret) { + fprintf(info_file, + "Error: fails to map mirror%d logical %llu: %s\n", + mirror_num, logical, strerror(-ret)); + return ret; + } + for (i = 0; i < multi->num_stripes; i++) { + device = multi->stripes[i].dev; + fprintf(info_file, + "mirror %d logical %Lu physical %Lu device %s\n", + mirror_num, logical + cur_offset, + multi->stripes[0].physical, + device->name); + } + kfree(multi); + multi = NULL; + cur_offset += cur_len; + } + return ret; +} + +/* + * Logical and len is the exact value of a extent. + * And offset is the offset inside the extent. It's only used for case + * where user only want to print part of the extent. + * + * Caller *MUST* ensure the range [logical,logical+len) are in one extent. + * Or we can encounter the following case, causing a -ENOENT error: + * |<-----given parameter------>| + * |<------ Extent A ----->| + */ +static int print_mapping_info(struct btrfs_fs_info *fs_info, u64 logical, + u64 len) +{ + int num_copies; + int mirror_num; + int ret = 0; + + num_copies = btrfs_num_copies(&fs_info->mapping_tree, logical, len); + for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) { + ret = __print_mapping_info(fs_info, logical, len, mirror_num); + if (ret < 0) + return ret; + } + return ret; +} + static struct extent_buffer * debug_read_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, u64 copy) { |