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Commit 0305bc27 authored by Qu Wenruo's avatar Qu Wenruo Committed by David Sterba
Browse files

btrfs: Output more info for enospc_debug mount option 



As one user in mail list report reproducible balance ENOSPC error, it's
better to add more debug info for enospc_debug mount option.

Reported-by: default avatarMarc Haber <mh+linux-btrfs@zugschlus.de>
Signed-off-by: default avatarQu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 264813ac

fs/btrfs/extent-tree.c

+19 −2
Original line number Original line Diff line number Diff line
@@ -9386,15 +9386,23 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) 
	u64 dev_min = 1;

	u64 dev_min = 1;

	u64 dev_nr = 0;

	u64 dev_nr = 0;

	u64 target;

	u64 target;

	int debug;

	int index;

	int index;

	int full = 0;

	int full = 0;

	int ret = 0;

	int ret = 0;





	debug = btrfs_test_opt(root, ENOSPC_DEBUG);



	block_group = btrfs_lookup_block_group(root->fs_info, bytenr);

	block_group = btrfs_lookup_block_group(root->fs_info, bytenr);





	/* odd, couldn't find the block group, leave it alone */

	/* odd, couldn't find the block group, leave it alone */

	if (!block_group)

	if (!block_group) {

		if (debug)

			btrfs_warn(root->fs_info,

				   "can't find block group for bytenr %llu",

				   bytenr);

		return -1;

		return -1;

	}





	min_free = btrfs_block_group_used(&block_group->item);

	min_free = btrfs_block_group_used(&block_group->item);
@@ -9448,8 +9456,13 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) 
		 * this is just a balance, so if we were marked as full

		 * this is just a balance, so if we were marked as full

		 * we know there is no space for a new chunk

		 * we know there is no space for a new chunk

		 */

		 */

		if (full)

		if (full) {

			if (debug)

				btrfs_warn(root->fs_info,

					"no space to alloc new chunk for block group %llu",

					block_group->key.objectid);

			goto out;

			goto out;

		}





		index = get_block_group_index(block_group);

		index = get_block_group_index(block_group);

	}

	}
@@ -9496,6 +9509,10 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) 
			ret = -1;

			ret = -1;

		}

		}

	}

	}

	if (debug && ret == -1)

		btrfs_warn(root->fs_info,

			"no space to allocate a new chunk for block group %llu",

			block_group->key.objectid);

	mutex_unlock(&root->fs_info->chunk_mutex);

	mutex_unlock(&root->fs_info->chunk_mutex);

	btrfs_end_transaction(trans, root);

	btrfs_end_transaction(trans, root);

out:

out: