Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Mon, 7 Aug 2023 12:55:53 -0700
From:   Jaegeuk Kim <jaegeuk@kernel.org>
To:     Chao Yu <chao@kernel.org>
Cc:     Shinichiro Kawasaki <shinichiro.kawasaki@wdc.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-f2fs-devel@lists.sourceforge.net" 
        <linux-f2fs-devel@lists.sourceforge.net>,
        Damien Le Moal <Damien.LeMoal@wdc.com>
Subject: Re: [f2fs-dev] [PATCH] f2fs: clean up w/ sbi->log_sectors_per_block
Message-ID: <ZNFMSde8S7ratVw6@google.com>
References: <20230523123521.67656-1-chao@kernel.org>
 <fafcfeosil5yqwn2wcdx33im2mq4xkejw6bx7h2in3ay5h6znj@facx4rrg4p65>
 <ZM1PwzoqSt05KqTp@google.com>
 <b3685d22-1be2-2376-5242-0e9a0f5471f8@kernel.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <b3685d22-1be2-2376-5242-0e9a0f5471f8@kernel.org>
Precedence: bulk

On 08/07, Chao Yu wrote:
> On 2023/8/5 3:21, Jaegeuk Kim wrote:
> > On 08/04, Shinichiro Kawasaki wrote:
> > > On May 23, 2023 / 20:35, Chao Yu wrote:
> > > > Use sbi->log_sectors_per_block to clean up below calculated one:
> > > > 
> > > > unsigned int log_sectors_per_block = sbi->log_blocksize - SECTOR_SHIFT;
> > > 
> > > Hello Chao,
> > > 
> > > When I ran workloads on f2fs using v6.5-rcX with fixes [1][2] and a zoned block
> > > devices with 4kb logical block size, I observe mount failure as follows. When
> > > I revert this commit, the failure goes away.
> > > 
> > > [  167.781975][ T1555] F2FS-fs (dm-0): IO Block Size:        4 KB
> > > [  167.890728][ T1555] F2FS-fs (dm-0): Found nat_bits in checkpoint
> > > [  171.482588][ T1555] F2FS-fs (dm-0): Zone without valid block has non-zero write pointer. Reset the write pointer: wp[0x1300,0x8]
> > > [  171.496000][ T1555] F2FS-fs (dm-0): (0) : Unaligned zone reset attempted (block 280000 + 80000)
> > > [  171.505037][ T1555] F2FS-fs (dm-0): Discard zone failed:  (errno=-5)
> > > 
> > > The patch replaced "sbi->log_blocksize - SECTOR_SHIFT" with
> > > "sbi->log_sectors_per_block". However, I think these two are not equal when the
> > > device has 4k logical block size. The former uses Linux kernel sector size 512
> > > byte. The latter use 512b sector size or 4kb sector size depending on the
> > > device. mkfs.f2fs obtains logical block size via BLKSSZGET ioctl from the device
> > > and reflects it to the value sbi->log_sector_size_per_block. This causes
> > > unexpected write pointer calculations in check_zone_write_pointer(). This
> > > resulted in unexpected zone reset and the mount failure.
> > > 
> > > I think this patch needs revert. What do you think?
> > 
> > Yeah, applied the revert.
> 
> Jaegeuk, could you please send the patch to mailing list?

I sent. Thanks.

> 
> Thanks,
> 
> > 
> > > 
> > > [1] https://lkml.kernel.org/linux-f2fs-devel/20230711050101.GA19128@lst.de/
> > > [2] https://lore.kernel.org/linux-f2fs-devel/20230804091556.2372567-1-shinichiro.kawasaki@wdc.com/