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btrfs: update stripe_extent delete loop assumptions

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btrfs_delete_raid_extent() was written under the assumption, that it's
call-chain always passes a start, length tuple that matches a single
extent. But btrfs_delete_raid_extent() is called by
do_free_extent_accounting() which in turn is called by
__btrfs_free_extent().

But this call-chain passes in a start address and a length that can
possibly match multiple on-disk extents.

To make this possible, we have to adjust the start and length of each
btree node lookup, to not delete beyond the requested range.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn
2024-07-09 09:40:34 +02:00
committed by David Sterba
parent 8c4cba2adb
commit 7fa5230b46
1 changed files with 5 additions and 0 deletions
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5
fs/btrfs/raid-stripe-tree.c
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@@ -66,6 +66,11 @@ int btrfs_delete_raid_extent(struct btrfs_trans_handle *trans, u64 start, u64 le
if (ret)
break;
start += key.offset;
length -= key.offset;
if (length == 0)
break;
btrfs_release_path(path);
}