Re: [PATCH 2/3] btrfs: always return -EIOCBQUEUED after btrfs_uring_read_extent_endio

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

在 2026/8/5 11:41, Yang Xiuwei 写道:
> If all bios finish before btrfs_encoded_read_regular_fill_pages()
> returns, it calls btrfs_uring_read_extent_endio() and previously
> returned the I/O status.  A negative errno then made
> btrfs_uring_read_extent() unlock and free while
> btrfs_uring_read_finished() did the same again.
> 
> Return -EIOCBQUEUED so only the deferred path cleans up.
> 
> Reported-by: Yue Sun <samsun1006219@gmail.com>
> Closes: https://lore.kernel.org/linux-btrfs/20260630091609.3414-1-samsun1006219@gmail.com/
> Suggested-by: Jens Axboe <axboe@kernel.dk>
> Fixes: 34310c442e17 ("btrfs: add io_uring command for encoded reads (ENCODED_READ ioctl)")
> Signed-off-by: Yang Xiuwei <yangxiuwei@kylinos.cn>

Sashiko is reporting errors on pre-existing problems for this and the 
next patch:

https://sashiko.dev/#/patchset/20260805021135.1896609-1-yangxiuwei%40kylinos.cn

I believe they are worth addressing since you're touching the error 
handling.


> ---
>   fs/btrfs/inode.c | 7 +++----
>   1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index b446c3014b24..8e3cee3845e6 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -9411,7 +9411,6 @@ int btrfs_encoded_read_regular_fill_pages(struct btrfs_inode *inode,
>   	struct completion sync_reads;
>   	unsigned long i = 0;
>   	struct btrfs_bio *bbio;
> -	int ret;
>   
>   	/*
>   	 * Fast path for synchronous reads which completes in this call, io_uring
> @@ -9458,10 +9457,10 @@ int btrfs_encoded_read_regular_fill_pages(struct btrfs_inode *inode,
>   
>   	if (uring_ctx) {
>   		if (refcount_dec_and_test(&priv->pending_refs)) {
> -			ret = blk_status_to_errno(READ_ONCE(priv->status));
> -			btrfs_uring_read_extent_endio(uring_ctx, ret);
> +			int err = blk_status_to_errno(READ_ONCE(priv->status));
> +
> +			btrfs_uring_read_extent_endio(uring_ctx, err);
>   			kfree(priv);
> -			return ret;
>   		}
>   
>   		return -EIOCBQUEUED;