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From: YangWen <anmuxixixi@gmail.com>
To: hirofumi@mail.parknet.co.jp
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] fat: fix data-race between fat12_ent_put() and fat_mirror_bhs()
Date: Wed,  3 Sep 2025 10:28:15 +0800	[thread overview]
Message-ID: <20250903022815.109-1-anmuxixixi@gmail.com> (raw)
In-Reply-To: <874itk20j2.fsf@mail.parknet.co.jp>

Hi,

OGAWA Hirofumi wrote:
> Sync mount doesn't try to keep all of consistency. It is trying to keep
> sync the minimum blocks for consistency. The primary should be always
> consistent, however this doesn't care much about mirror FAT.

Thanks a lot for your explanation. I understand your point and you are
right.I just noticed that in fat_mirror_bhs(), the buffer head "c_bh" actually
represents the mirror FAT blocks, and the code does:

    if (sb->s_flags & SB_SYNCHRONOUS)
        err = sync_dirty_buffer(c_bh);

So on -o sync mounts the mirror FAT blocks are also forced to disk
immediately.

Thanks.

  reply	other threads:[~2025-09-03  2:28 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-09-02  8:17 YangWen
2025-09-02  9:01 ` OGAWA Hirofumi
2025-09-02 12:07   ` [PATCH] drivers: example: fix memory leak YangWen
2025-09-02 12:38     ` OGAWA Hirofumi
2025-09-02 13:24       ` [PATCH] fat: fix data-race between fat12_ent_put() and fat_mirror_bhs() YangWen
2025-09-02 13:38         ` OGAWA Hirofumi
2025-09-02 14:20           ` YangWen
2025-09-02 18:05             ` OGAWA Hirofumi
2025-09-03  2:28               ` YangWen [this message]
2025-09-02 12:11   ` YangWen
2025-09-02 19:56 ` kernel test robot

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