Commit 3128b548 authored by Filipe Manana's avatar Filipe Manana Committed by David Sterba
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btrfs: split assert into two different asserts when removing block group 



When starting a transaction to remove a block group we have one ASSERT
that checks we found an extent map and that the extent map's start offset
matches the desired chunk offset. In case one of the conditions fails, we
get a stack trace that point to the respective line of code, however we
can't tell which condition failed: either there's no extent map or we got
one with an unexpected start offset. To make such an issue easier to debug
and analyse, split the assertion into two, one for each condition. This
was actually triggered during development of another upcoming change.

Reviewed-by: default avatarJosef Bacik <josef@toxicpanda.com>
Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 5031660a

fs/btrfs/block-group.c

+2 −1
Original line number Diff line number Diff line
@@ -1303,7 +1303,8 @@ struct btrfs_trans_handle *btrfs_start_trans_remove_block_group( 
	read_lock(&em_tree->lock);

	em = lookup_extent_mapping(em_tree, chunk_offset, 1);

	read_unlock(&em_tree->lock);

	ASSERT(em && em->start == chunk_offset);

	ASSERT(em != NULL);

	ASSERT(em->start == chunk_offset);



	/*

	 * We need to reserve 3 + N units from the metadata space info in order