linux-kernel - Re: [PATCH 0/3] f2fs: fix panic issue in small capacity device

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Date: Mon, 5 Feb 2024 19:15:50 -0800
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Zhiguo Niu <zhiguo.niu@...soc.com>
Cc: chao@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, niuzhiguo84@...il.com,
	ke.wang@...soc.com, hongyu.jin@...soc.com
Subject: Re: [PATCH 0/3] f2fs: fix panic issue in small capacity device

On 01/29, Zhiguo Niu wrote:
> A panic issue happened in a reboot test in small capacity device
> as following:
> 1.The device size is 64MB, and main area has 24 segments, and
> CONFIG_F2FS_CHECK_FS is not enabled.
> 2.There is no any free segments left shown in free_segmap_info,
> then another write request cause get_new_segment get a out-of-bound
> segment with segno 24.
> 3.panic happen in update_sit_entry because access invalid bitmap
> pointer.

The goal here is to stop f2fs when it hits no space to write anymore?
And, we need f2fs_stop_checkpoint() at the end?

> 
> More detail shown in following three patches.
> The three patches are splited here because the modifications are
> relatively independent and more readable.
> 
> Zhiguo Niu (3):
>   f2fs: correct counting methods of free_segments in __set_inuse
>   f2fs: fix panic issue in update_sit_entry
>   f2fs: enhance judgment conditions of GET_SEGNO
> 
>  fs/f2fs/file.c    | 7 ++++++-
>  fs/f2fs/segment.c | 9 ++++++---
>  fs/f2fs/segment.h | 7 ++++---
>  3 files changed, 16 insertions(+), 7 deletions(-)
> 
> -- 
> 1.9.1