On Tue, Feb 14, 2017 at 08:57:50AM +0800, Qu Wenruo wrote:
> When balance(relocation) fails, btrfs-progs will report like:
>
> ERROR: error during balancing '/mnt/scratch': Input/output error
> There may be more info in syslog - try dmesg | tail
>
> However kernel can't provide may useful info in many cases to locate the
> problem.
>
> This patch will add error messages in relocation to help user and
> developer to locate the problem.
Reviewed-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
Thanks,
-liubo
>
> Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
> ---
> v2:
> Fix typo where 'err' and 'ret' are used wrong.
> ---
> fs/btrfs/relocation.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++----
> 1 file changed, 56 insertions(+), 4 deletions(-)
>
> diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
> index 379711048fb0..d26809807c1b 100644
> --- a/fs/btrfs/relocation.c
> +++ b/fs/btrfs/relocation.c
> @@ -4011,6 +4011,8 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
> rc->block_rsv, rc->block_rsv->size,
> BTRFS_RESERVE_FLUSH_ALL);
> if (ret) {
> + btrfs_err(fs_info, "failed to reserve space: %d(%s)",
> + ret, btrfs_decode_error(ret));
> err = ret;
> break;
> }
> @@ -4019,6 +4021,9 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
> if (IS_ERR(trans)) {
> err = PTR_ERR(trans);
> trans = NULL;
> + btrfs_err(fs_info,
> + "failed to start transaction: %d(%s)",
> + err, btrfs_decode_error(err));
> break;
> }
> restart:
> @@ -4028,8 +4033,11 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
> }
>
> ret = find_next_extent(rc, path, &key);
> - if (ret < 0)
> + if (ret < 0) {
> + btrfs_err(fs_info, "failed to find next extent: %d(%s)",
> + ret, btrfs_decode_error(ret));
> err = ret;
> + }
> if (ret != 0)
> break;
>
> @@ -4081,9 +4089,17 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
>
> if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
> ret = add_tree_block(rc, &key, path, &blocks);
> + if (ret < 0)
> + btrfs_err(fs_info,
> + "failed to record tree block: %d(%s)",
> + ret, btrfs_decode_error(ret));
> } else if (rc->stage == UPDATE_DATA_PTRS &&
> (flags & BTRFS_EXTENT_FLAG_DATA)) {
> ret = add_data_references(rc, &key, path, &blocks);
> + if (ret < 0)
> + btrfs_err(fs_info,
> + "failed to record data extent: %d(%s)",
> + ret, btrfs_decode_error(ret));
> } else {
> btrfs_release_path(path);
> ret = 0;
> @@ -4103,6 +4119,9 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
> rc->backref_cache.last_trans = trans->transid - 1;
>
> if (ret != -EAGAIN) {
> + btrfs_err(fs_info,
> + "faild to relocate tree blocks: %d(%s)",
> + ret, btrfs_decode_error(ret));
> err = ret;
> break;
> }
> @@ -4121,6 +4140,9 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
> ret = relocate_data_extent(rc->data_inode,
> &key, &rc->cluster);
> if (ret < 0) {
> + btrfs_err(fs_info,
> + "failed to relocate data extent: %d(%s)",
> + ret, btrfs_decode_error(ret));
> err = ret;
> break;
> }
> @@ -4147,8 +4169,12 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
> if (!err) {
> ret = relocate_file_extent_cluster(rc->data_inode,
> &rc->cluster);
> - if (ret < 0)
> + if (ret < 0) {
> + btrfs_err(fs_info,
> + "failed to relocate file extent cluster: %d(%s)",
> + ret, btrfs_decode_error(ret));
> err = ret;
> + }
> }
>
> rc->create_reloc_tree = 0;
> @@ -4158,6 +4184,10 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
> btrfs_block_rsv_release(fs_info, rc->block_rsv, (u64)-1);
>
> err = prepare_to_merge(rc, err);
> + if (err < 0)
> + btrfs_err(fs_info,
> + "failed to preapre merge relocate trees: %d(%s)",
> + err, btrfs_decode_error(err));
>
> merge_reloc_roots(rc);
>
> @@ -4336,6 +4366,9 @@ int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start)
>
> ret = btrfs_inc_block_group_ro(extent_root, rc->block_group);
> if (ret) {
> + btrfs_err(fs_info,
> + "failed to set block group read-only: %d(%s)",
> + ret, btrfs_decode_error(ret));
> err = ret;
> goto out;
> }
> @@ -4351,10 +4384,19 @@ int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start)
> path);
> btrfs_free_path(path);
>
> - if (!IS_ERR(inode))
> + if (!IS_ERR(inode)) {
> ret = delete_block_group_cache(fs_info, rc->block_group, inode, 0);
> - else
> + if (ret < 0)
> + btrfs_err(fs_info,
> + "failed to delete block group cache: %d(%s)",
> + ret, btrfs_decode_error(ret));
> + } else {
> ret = PTR_ERR(inode);
> + if (ret < 0 && ret != -ENOENT)
> + btrfs_err(fs_info,
> + "failed to lookup free space inode: %d(%s)",
> + ret, btrfs_decode_error(ret));
> + }
>
> if (ret && ret != -ENOENT) {
> err = ret;
> @@ -4364,6 +4406,8 @@ int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start)
> rc->data_inode = create_reloc_inode(fs_info, rc->block_group);
> if (IS_ERR(rc->data_inode)) {
> err = PTR_ERR(rc->data_inode);
> + btrfs_err(fs_info, "failed to create relocate inode: %d(%s)",
> + err, btrfs_decode_error(err));
> rc->data_inode = NULL;
> goto out;
> }
> @@ -4394,6 +4438,9 @@ int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start)
> ret = btrfs_wait_ordered_range(rc->data_inode, 0,
> (u64)-1);
> if (ret) {
> + btrfs_err(fs_info,
> + "failed to wait ordered range: %d(%s)",
> + ret, btrfs_decode_error(ret));
> err = ret;
> goto out;
> }
> @@ -4407,6 +4454,11 @@ int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start)
> WARN_ON(rc->block_group->reserved > 0);
> WARN_ON(btrfs_block_group_used(&rc->block_group->item) > 0);
> out:
> + if (err < 0)
> + btrfs_err(fs_info,
> + "failed to relocate block group %llu: %d(%s)",
> + rc->block_group->key.objectid, err,
> + btrfs_decode_error(err));
> if (err && rw)
> btrfs_dec_block_group_ro(rc->block_group);
> iput(rc->data_inode);
> --
> 2.11.1
>
>
>
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