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Date: Thu, 14 Oct 2021 09:42:59 +0800 From: Yue Hu <zbestahu@....com> To: Gao Xiang <hsiangkao@...ux.alibaba.com> Cc: Yue Hu <zbestahu@...il.com>, xiang@...nel.org, chao@...nel.org, linux-erofs@...ts.ozlabs.org, linux-kernel@...r.kernel.org, huyue2@...ong.com, zhangwen@...ong.com Subject: Re: [PATCH] erofs: fix the per-CPU buffer decompression for small output size On Thu, 14 Oct 2021 00:03:02 +0800 Gao Xiang <hsiangkao@...ux.alibaba.com> wrote: > On Wed, Oct 13, 2021 at 09:10:05PM +0800, Yue Hu wrote: > > Hi Xiang, > > > > On Wed, 13 Oct 2021 19:51:55 +0800 > > Gao Xiang <hsiangkao@...ux.alibaba.com> wrote: > > > > > Hi Yue, > > > > > > On Wed, Oct 13, 2021 at 05:29:05PM +0800, Yue Hu wrote: > > > > From: Yue Hu <huyue2@...ong.com> > > > > > > > > Note that z_erofs_lz4_decompress() will return a positive value if > > > > decompression succeeds. However, we do not copy_from_pcpubuf() due > > > > to !ret. Let's fix it. > > > > > > > > Signed-off-by: Yue Hu <huyue2@...ong.com> > > > > > > Thanks for catching this. This is a valid issue, but it has no real > > > impact to the current kernels since such pcluster in practice will be > > > !inplace_io and trigger "if (nrpages_out == 1 && !rq->inplace_io) {" > > > above for upstream strategies. > > > > > > Our customized lz4 implementation will return 0 if success instead, so > > > it has no issue to our previous products as well. > > > > Yes, i just find the issue when i try to implement a new feature of > > tail-packing inline compressed data. No problem in my current version. > > Yeah, please help update the return value of z_erofs_lz4_decompress() > and get rid of such unneeded fast path. OK, will update in next version. Thanks. > > Thanks, > Gao Xiang > > > > > Thanks. > > > > > > > > For such cases, how about updating z_erofs_lz4_decompress() to return > > > 0 if success instead rather than outputsize. Since I'll return 0 if > > > success for LZMA as well. > > > > > > Thanks, > > > Gao Xiang > >
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