Re: [f2fs-dev] [PATCH v7] fsck.f2fs: Detect and fix looped node chain efficiently

[Chao Yu <chao@kernel.org>]

On 2023/5/23 18:40, Chunhai Guo wrote:
> find_fsync_inode() detect the looped node chain by comparing the loop
> counter with free blocks. While it may take tens of seconds to quit when
> the free blocks are large enough. We can use Floyd's cycle detection
> algorithm to make the detection more efficient, and fix the issue by
> filling a NULL address in the last node of the chain.
> 
> Below is the log we encounter on a 256GB UFS storage and it takes about
> 25 seconds to detect looped node chain. After changing the algorithm, it
> takes about 20ms to finish the same job.
> 
>      [   10.822904] fsck.f2fs: Info: version timestamp cur: 17, prev: 430
>      [   10.822949] fsck.f2fs: [update_superblock: 762] Info: Done to
> update superblock
>      [   10.822953] fsck.f2fs: Info: superblock features = 1499 :
> encrypt verity extra_attr project_quota quota_ino casefold
>      [   10.822956] fsck.f2fs: Info: superblock encrypt level = 0, salt =
> 00000000000000000000000000000000
>      [   10.822960] fsck.f2fs: Info: total FS sectors = 59249811 (231444
> MB)
>      [   35.852827] fsck.f2fs:	detect looped node chain,
> blkaddr:1114802, next:1114803
>      [   35.852842] fsck.f2fs: [f2fs_do_mount:3846] record_fsync_data
> failed
>      [   35.856106] fsck.f2fs: fsck.f2fs terminated by exit(255)
> 
> Signed-off-by: Chunhai Guo <guochunhai@vivo.com>

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

Thanks,


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