Re: [f2fs-dev] [PATCH v4 1/2] f2fs: Check write pointer consistency of open zones

[Chao Yu <yuchao0@huawei.com>]

On 2019/12/2 17:40, Shin'ichiro Kawasaki wrote:
> On sudden f2fs shutdown, write pointers of zoned block devices can go
> further but f2fs meta data keeps current segments at positions before the
> write operations. After remounting the f2fs, this inconsistency causes
> write operations not at write pointers and "Unaligned write command"
> error is reported.
> 
> To avoid the error, compare current segments with write pointers of open
> zones the current segments point to, during mount operation. If the write
> pointer position is not aligned with the current segment position, assign
> a new zone to the current segment. Also check the newly assigned zone has
> write pointer at zone start. If not, reset write pointer of the zone.
> 
> Perform the consistency check during fsync recovery. Not to lose the
> fsync data, do the check after fsync data gets restored and before
> checkpoint commit which flushes data at current segment positions. Not to
> cause conflict with kworker's dirfy data/node flush, do the fix within
> SBI_POR_DOING protection.
> 
> Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>

Reviewed-by: Chao Yu <yuchao0@huawei.com>

Thanks,


_______________________________________________
Linux-f2fs-devel mailing list
Linux-f2fs-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel