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btrfs: assert tree is locked when clearing extent map from logging

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When calling clear_em_logging() we should have a write lock on the extent
map tree, as we will try to merge the extent map with the previous and
next ones in the tree. So assert that we have a write lock.

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 2022-09-19 15:06:36 +01:00 committed by David Sterba
parent 2e0cdaa028
commit 74333c7d87
1 changed files with 2 additions and 0 deletions
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2
fs/btrfs/extent_map.c
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@ -334,6 +334,8 @@ int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len,
void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em)
{
lockdep_assert_held_write(&tree->lock);
clear_bit(EXTENT_FLAG_LOGGING, &em->flags);
if (extent_map_in_tree(em))
try_merge_map(tree, em);