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btrfs: assert extent map is not in a list when setting it up

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When setting up a new extent map, at setup_extent_mapping(), we're doing
a list move operation to add the extent map the tree's list of modified
extents. This is confusing because at this point the extent map can not
be in any list, because it's a new extent map. So replace the list move
with a list add and add an assertion that checks that the extent map is
not currently in any list.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2023-12-04 16:20:23 +00:00 committed by David Sterba
parent 637e6e0f50
commit 32d53f6f7b
1 changed files with 3 additions and 1 deletions
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4
fs/btrfs/extent_map.c
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@ -345,8 +345,10 @@ static inline void setup_extent_mapping(struct extent_map_tree *tree,
em->mod_start = em->start;
em->mod_len = em->len;
ASSERT(list_empty(&em->list));
if (modified)
list_move(&em->list, &tree->modified_extents);
list_add(&em->list, &tree->modified_extents);
else
try_merge_map(tree, em);
}