Re: [PATCH] erofs: sunset unneeded NOFAILs

[Chao Yu <chao@kernel.org>]

On 2024/9/5 16:47, Gao Xiang wrote:
> With iterative development, our codebase can now deal with compressed
> buffer misses properly if both in-place I/O and compressed buffer
> allocation fail.
> 
> Note that if readahead fails (with non-uptodate folios), the original
> request will then fall back to synchronous read, and `.read_folio()`
> should return appropriate errnos; otherwise -EIO will be passed to
> user space, which is unexpected.
> 
> To simplify rarely encountered failure paths, a mimic decompression
> will be just used.  Before that, failure reasons are recorded in
> compressed_bvecs[] and they also act as placeholders to avoid in-place
> pages.  They will be parsed just before decompression and then pass
> back to `.read_folio()`.
> 
> Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Reviewed-by: Chao Yu <chao@kernel.org>

Thanks,