Re: [f2fs-dev] [PATCH] f2fs: avoid setting SBI_NEED_FSCK on transient resize failure with -EAGAIN

[Chao Yu <chao@kernel.org>]

On 8/19/26 01:05, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@google.com>
> 
> When f2fs_resize_fs() fails due to transient lock contention or retryable
> GC failure in free_segment_range() returning -EAGAIN, no filesystem
> metadata has been modified on-disk yet. The filesystem remains completely
> consistent and clean.

Any way to make sure EAGAIN is from free_segment_range(), in case we return
EAGAIN from 1) any other places that we may miss to check now or 2) we changed
the code to return EAGAIN in future.

Thanks,

> 
> However, the current error recovery path unconditionally sets the
> SBI_NEED_FSCK flag on any error, forcing an unnecessary and time-consuming
> fsck.f2fs repair on the subsequent mount/reboot.
> 
> Fix this by guarding set_sbi_flag(sbi, SBI_NEED_FSCK) with
> `if (err != -EAGAIN)`, avoiding false-positive filesystem corruption
> flags on transient resize retries.
> 
> Signed-off-by: Daeho Jeong <daehojeong@google.com>
> Signed-off-by: Sunmin Jeong <s_min.jeong@samsung.com>
> ---
>  fs/f2fs/gc.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index 192b16ac02f8..787133ee2eb2 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -2446,8 +2446,10 @@ int f2fs_resize_fs(struct file *filp, __u64 block_count)
>  recover_out:
>  	clear_sbi_flag(sbi, SBI_IS_RESIZEFS);
>  	if (err) {
> -		set_sbi_flag(sbi, SBI_NEED_FSCK);
> -		f2fs_err(sbi, "resize_fs failed, should run fsck to repair!");
> +		if (err != -EAGAIN) {
> +			set_sbi_flag(sbi, SBI_NEED_FSCK);
> +			f2fs_err(sbi, "resize_fs failed, should run fsck to repair!");
> +		}
>  
>  		spin_lock(&sbi->stat_lock);
>  		sbi->user_block_count += shrunk_blocks;