From: "chenxiaosong (A)" <chenxiaosong2@huawei.com>
To: Trond Myklebust <trondmy@hammerspace.com>,
"anna@kernel.org" <anna@kernel.org>,
"smayhew@redhat.com" <smayhew@redhat.com>
Cc: "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
"liuyongqiang13@huawei.com" <liuyongqiang13@huawei.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"yi.zhang@huawei.com" <yi.zhang@huawei.com>,
"zhangxiaoxu5@huawei.com" <zhangxiaoxu5@huawei.com>
Subject: Re: [PATCH -next 1/2] nfs: nfs{,4}_file_flush should consume writeback error
Date: Mon, 9 May 2022 15:43:13 +0800 [thread overview]
Message-ID: <b68595e0-68e2-a194-ea93-a96decbdbb8f@huawei.com> (raw)
In-Reply-To: <a3300d4d-6428-8157-b2dc-eaeb9f249858@huawei.com>
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?
next prev parent reply other threads:[~2022-05-09 7:51 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-05 12:46 [PATCH -next 0/2] nfs: check writeback errors correctly ChenXiaoSong
2022-03-05 12:46 ` [PATCH -next 1/2] nfs: nfs{,4}_file_flush should consume writeback error ChenXiaoSong
2022-03-05 16:53 ` Trond Myklebust
2022-03-06 3:54 ` chenxiaosong (A)
2022-03-06 14:04 ` Trond Myklebust
2022-03-06 15:08 ` Trond Myklebust
2022-04-12 13:46 ` chenxiaosong (A)
2022-04-12 13:56 ` Trond Myklebust
2022-04-12 14:12 ` chenxiaosong (A)
2022-04-12 14:27 ` Trond Myklebust
2022-04-20 8:50 ` chenxiaosong (A)
2022-05-09 7:43 ` chenxiaosong (A) [this message]
2022-03-05 12:46 ` [PATCH -next 2/2] nfs: nfs_file_write() check writeback errors correctly ChenXiaoSong
2022-03-05 17:12 ` Trond Myklebust
2022-03-06 8:50 ` chenxiaosong (A)
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