Filipe Manana wrote on Thu, Jun 30, 2022 at 04:10:38PM +0100:
> This may prevent the short reads (not tested yet):
>
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index 7a54f964ff37..42fb56ed0021 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -7684,7 +7684,7 @@ static int btrfs_dio_iomap_begin(struct inode *inode, loff_t start,
> if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) ||
> em->block_start == EXTENT_MAP_INLINE) {
> free_extent_map(em);
> - ret = -ENOTBLK;
> + ret = (flags & IOMAP_NOWAIT) ? -EAGAIN : -ENOTBLK;
> goto unlock_err;
> }
>
> Can you give it a try?
This appears to do the trick!
I've also removed the first patch and still cannot see any short reads,
so this would be enough on its own for my case.
--
Dominique
