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btrfs: defrag: fix check to see if next extent can be defragged too

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We want to check if the next extent is at maximum capacity but we are
passing the current extent map to get_extent_max_capacity() and not
the next extent map. For example if the current extent is compressed (its
maximum capacity is 128K) and the next extent is uncompressed (its
maximum capacity is 128M), then we can bail out and not defrag the next
extent too - when for example the next extent as a size of 128K, is
uncompressed, and the extent threshold is >= 256K.

Fixes: 979b25c300 ("btrfs: defrag: don't defrag extents which are already at max capacity")
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2026-10-07 16:08:50 +01:00 committed by David Sterba
parent 04136cd21c
commit eb55bc2bfe
1 changed files with 1 additions and 1 deletions
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fs/btrfs/defrag.c
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@ -811,7 +811,7 @@ static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em,
* If the next extent is at its max capacity, defragging current extent
* makes no sense, as the total number of extents won't change.
*/
if (next->len >= get_extent_max_capacity(fs_info, em))
if (next->len >= get_extent_max_capacity(fs_info, next))
goto out;
/* Skip older extent */
if (next->generation < newer_than)