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Tue, 03 Mar 2020 14:06:22 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 49E9CC433A2; Tue, 3 Mar 2020 14:06:22 +0000 (UTC) Received: from codeaurora.org (blr-c-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: stummala) by smtp.codeaurora.org (Postfix) with ESMTPSA id 35924C43383; Tue, 3 Mar 2020 14:06:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 35924C43383 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=stummala@codeaurora.org Date: Tue, 3 Mar 2020 19:36:16 +0530 From: Sahitya Tummala To: Chao Yu Message-ID: <20200303140616.GF20234@codeaurora.org> References: <1582799978-22277-1-git-send-email-stummala@codeaurora.org> <20200302043948.GE20234@codeaurora.org> <4d228adb-7038-1c03-e877-93221b920104@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <4d228adb-7038-1c03-e877-93221b920104@huawei.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-Headers-End: 1j98Bz-005m6K-Sc Subject: Re: [f2fs-dev] [PATCH 1/2] f2fs: Fix mount failure due to SPO after a successful online resize FS X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jaegeuk Kim , linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net Hi Chao, On Tue, Mar 03, 2020 at 08:06:21PM +0800, Chao Yu wrote: > Hi Sahitya, > > On 2020/3/2 12:39, Sahitya Tummala wrote: > > Hi Chao, > > > > On Fri, Feb 28, 2020 at 04:35:37PM +0800, Chao Yu wrote: > >> Hi Sahitya, > >> > >> Good catch. > >> > >> On 2020/2/27 18:39, Sahitya Tummala wrote: > >>> Even though online resize is successfully done, a SPO immediately > >>> after resize, still causes below error in the next mount. > >>> > >>> [ 11.294650] F2FS-fs (sda8): Wrong user_block_count: 2233856 > >>> [ 11.300272] F2FS-fs (sda8): Failed to get valid F2FS checkpoint > >>> > >>> This is because after FS metadata is updated in update_fs_metadata() > >>> if the SBI_IS_DIRTY is not dirty, then CP will not be done to reflect > >>> the new user_block_count. > >>> > >>> Signed-off-by: Sahitya Tummala > >>> --- > >>> fs/f2fs/gc.c | 1 + > >>> 1 file changed, 1 insertion(+) > >>> > >>> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c > >>> index a92fa49..a14a75f 100644 > >>> --- a/fs/f2fs/gc.c > >>> +++ b/fs/f2fs/gc.c > >>> @@ -1577,6 +1577,7 @@ int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count) > >>> > >>> update_fs_metadata(sbi, -secs); > >>> clear_sbi_flag(sbi, SBI_IS_RESIZEFS); > >> > >> Need a barrier here to keep order in between above code and set_sbi_flag(DIRTY)? > > > > I don't think a barrier will help here. Let us say there is a another context > > doing CP already, then it races with update_fs_metadata(), so it may or may not > > see the resize updates and it will also clear the SBI_IS_DIRTY flag set by resize > > (even with a barrier). > > I agreed, actually, we didn't consider race condition in between CP and > update_fs_metadata(), it should be fixed. > > > > > I think we need to synchronize this with CP context, so that these resize changes > > will be reflected properly. Please see the new diff below and help with the review. > > > > diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c > > index a14a75f..5554af8 100644 > > --- a/fs/f2fs/gc.c > > +++ b/fs/f2fs/gc.c > > @@ -1467,6 +1467,7 @@ static void update_fs_metadata(struct f2fs_sb_info *sbi, int secs) > > long long user_block_count = > > le64_to_cpu(F2FS_CKPT(sbi)->user_block_count); > > > > + clear_sbi_flag(sbi, SBI_IS_DIRTY); > > Why clear dirty flag here? Yes, it is not required. I will remove it. > > And why not use cp_mutex to protect update_fs_metadata() in error path of > f2fs_sync_fs() below? Yes, will add a lock there too. Thanks, > > > SM_I(sbi)->segment_count = (int)SM_I(sbi)->segment_count + segs; > > MAIN_SEGS(sbi) = (int)MAIN_SEGS(sbi) + segs; > > FREE_I(sbi)->free_sections = (int)FREE_I(sbi)->free_sections + secs; > > @@ -1575,9 +1576,12 @@ int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count) > > goto out; > > } > > > > + mutex_lock(&sbi->cp_mutex); > > update_fs_metadata(sbi, -secs); > > clear_sbi_flag(sbi, SBI_IS_RESIZEFS); > > set_sbi_flag(sbi, SBI_IS_DIRTY); > > + mutex_unlock(&sbi->cp_mutex); > > + > > err = f2fs_sync_fs(sbi->sb, 1); > > if (err) { > > update_fs_metadata(sbi, secs); > > ^^^^^^^^^^^^^^ > > In addition, I found that we missed to use sb_lock to protect f2fs_super_block > fields update, will submit a patch for that. > > Thanks, > > > > > thanks, > > > >> > >>> + set_sbi_flag(sbi, SBI_IS_DIRTY); > >>> err = f2fs_sync_fs(sbi->sb, 1); > >>> if (err) { > >>> update_fs_metadata(sbi, secs); > >> > >> Do we need to add clear_sbi_flag(, SBI_IS_DIRTY) into update_fs_metadata(), so above > >> path can be covered as well? > >> > >> Thanks, > >> > >>> > > -- -- Sent by a consultant of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum. _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel