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Message-ID: <b68595e0-68e2-a194-ea93-a96decbdbb8f@huawei.com>
Date: Mon, 9 May 2022 15:43:13 +0800
From: "chenxiaosong (A)" <chenxiaosong2@...wei.com>
To: Trond Myklebust <trondmy@...merspace.com>,
"anna@...nel.org" <anna@...nel.org>,
"smayhew@...hat.com" <smayhew@...hat.com>
CC: "linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
"liuyongqiang13@...wei.com" <liuyongqiang13@...wei.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"yi.zhang@...wei.com" <yi.zhang@...wei.com>,
"zhangxiaoxu5@...wei.com" <zhangxiaoxu5@...wei.com>
Subject: Re: [PATCH -next 1/2] nfs: nfs{,4}_file_flush should consume
writeback error
在 2022/4/20 16:50, chenxiaosong (A) 写道:
> 在 2022/4/12 22:27, Trond Myklebust 写道:
>
>>
>> It will clear ENOSPC, EDQUOT and EFBIG. It should not clear other
>> errors that are not supposed to be reported by write().
>>
>> As I keep repeating, that is _documented behaviour_!
>>
>
> Hi Trond:
>
> You may mean that write(2) manpage described:
>
>> Since Linux 4.13, errors from write-back come with a promise that
>> they may be reported by subsequent. write(2) requests, and will be
>> reported by a subsequent fsync(2) (whether or not they were also
>> reported by write(2)).
>
> The manpage mentioned that "reported by a subsequent fsync(2)", your
> patch[1] clear the wb err on _async_ write(), and wb err will _not_ be
> reported by subsequent fsync(2), is it documented behaviour?
>
> All other filesystems will _not_ clear any wb err on _async_ write().
>
> [1]
> https://patchwork.kernel.org/project/linux-nfs/patch/20220411213346.762302-4-trondmy@kernel.org/
>
Hi Trond:
write(2) manpage described:
> On some filesystems, including NFS, it does not even guarantee that
> space has successfully been reserved for the data. In this case, some
> errors might be delayed until a future write(2), fsync(2), or even
> close(2). The only way to be sure is to call fsync(2) after you are
> done writing all your data.
Maybe it mean that: writeback errors of NFS is delayed until future sync
write() and fsync(), because sync write() will call fsync(). We all
agreed that close()->flush() should not clear writeback errors, should
async write() do the same thing like other filesystems?
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