In find_free_extent() under checks: tag, we have the following code
------
search_start = ALIGN(offset, fs_info->stripesize);
/* move on to the next group */
if (search_start + num_bytes >
block_group->key.objectid + block_group->key.offset) {
btrfs_add_free_space(block_group, offset, num_bytes);
goto loop;
}
if (offset < search_start)
btrfs_add_free_space(block_group, offset,
search_start - offset);
BUG_ON(offset > search_start);
------
However ALIGN() is rounding up, thus @search_start >= @offset and that
BUG_ON() will never be triggered.
Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
---
changelog:
v2:
Fix my stupid error on judging whether ALIGN() is rounding up or down.
---
fs/btrfs/extent-tree.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index f18e86177067..de4a85dfb98e 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -7754,7 +7754,7 @@ static noinline int find_free_extent(struct btrfs_fs_info *fs_info,
goto loop;
}
checks:
- search_start = ALIGN(offset, fs_info->stripesize);
+ search_start = round_up(offset, fs_info->stripesize);
/* move on to the next group */
if (search_start + num_bytes >
@@ -7766,7 +7766,6 @@ static noinline int find_free_extent(struct btrfs_fs_info *fs_info,
if (offset < search_start)
btrfs_add_free_space(block_group, offset,
search_start - offset);
- BUG_ON(offset > search_start);
ret = btrfs_add_reserved_bytes(block_group, ram_bytes,
num_bytes, delalloc);
--
2.18.0
--
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