linux-kernel - Re: [f2fs-dev] [PATCH] Revert "f2fs: clean up w/ sbi->log_sectors_per

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Message-ID: <eefdd25f-502c-8ab4-c49b-f1cb2c6bfd2a@kernel.org>
Date:   Tue, 8 Aug 2023 08:48:25 +0800
From:   Chao Yu <chao@...nel.org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Cc:     Shinichiro Kawasaki <shinichiro.kawasaki@....com>,
        stable@...r.kernel.org
Subject: Re: [f2fs-dev] [PATCH] Revert "f2fs: clean up w/
 sbi->log_sectors_per_block"

On 2023/8/8 3:52, Jaegeuk Kim wrote:
> This reverts commit bfd476623999118d9c509cb0fa9380f2912bc225.
> 
> Shinichiro Kawasaki reported:
> 
> 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.
> 
> [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/
> 
> Cc: stable@...r.kernel.org
> Reported-by: Shinichiro Kawasaki <shinichiro.kawasaki@....com>
> Fixes: bfd476623999 ("f2fs: clean up w/ sbi->log_sectors_per_block")
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>

Reviewed-by: Chao Yu <chao@...nel.org>

Thanks,