On 2019/4/4 下午2:23, Nikolay Borisov wrote:
>
>
> On 4.04.19 г. 6:47 ч., Qu Wenruo wrote:
>> Commit 1ba98d086fe3 ("Btrfs: detect corruption when non-root leaf has
>> zero item") introduced comprehensive root owner checker.
>>
>> However it's pretty expensive tree search to locate the owner root,
>> especially when it get reused by mandatory read and write time
>> tree-checker.
>>
>> This patch will remove that check, and completely rely on owner based
>> empty leaf check, which is much faster and still works fine for most
>> case.
>>
>> And since we skip the old root owner check, now write time tree check
>> can be merged with btrfs_check_leaf_full().
>>
>> Signed-off-by: Qu Wenruo <w...@suse.com>
>
> This patch was sent yesterday, now it's sent again with no material
> changes whatsoever? What's the point?
This is the version to be applied on misc-next.
Thanks,
Qu
>
>> ---
>> fs/btrfs/tree-checker.c | 24 ------------------------
>> 1 file changed, 24 deletions(-)
>>
>> diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
>> index d2c3c1f8870d..e325d4df5c23 100644
>> --- a/fs/btrfs/tree-checker.c
>> +++ b/fs/btrfs/tree-checker.c
>> @@ -838,7 +838,6 @@ static int check_leaf(struct extent_buffer *leaf, bool
>> check_item_data)
>> */
>> if (nritems == 0 && !btrfs_header_flag(leaf, BTRFS_HEADER_FLAG_RELOC)) {
>> u64 owner = btrfs_header_owner(leaf);
>> - struct btrfs_root *check_root;
>>
>> /* These trees must never be empty */
>> if (owner == BTRFS_ROOT_TREE_OBJECTID ||
>> @@ -852,29 +851,6 @@ static int check_leaf(struct extent_buffer *leaf, bool
>> check_item_data)
>> owner);
>> return -EUCLEAN;
>> }
>> - key.objectid = owner;
>> - key.type = BTRFS_ROOT_ITEM_KEY;
>> - key.offset = (u64)-1;
>> -
>> - check_root = btrfs_get_fs_root(fs_info, &key, false);
>> - /*
>> - * The only reason we also check NULL here is that during
>> - * open_ctree() some roots has not yet been set up.
>> - */
>> - if (!IS_ERR_OR_NULL(check_root)) {
>> - struct extent_buffer *eb;
>> -
>> - eb = btrfs_root_node(check_root);
>> - /* if leaf is the root, then it's fine */
>> - if (leaf != eb) {
>> - generic_err(leaf, 0,
>> - "invalid nritems, have %u should not be 0 for non-root leaf",
>> - nritems);
>> - free_extent_buffer(eb);
>> - return -EUCLEAN;
>> - }
>> - free_extent_buffer(eb);
>> - }
>> return 0;
>> }
>>
>>
