linux-kernel - Re: [f2fs-dev] [PATCH v3] f2fs: introduce fragment allocation mode mount option

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Message-ID: <CACOAw_wyLX_mnnPV0vWeAqTtEDx_bhG2c72jq6YmjQGOgtVLeg@mail.gmail.com>
Date:   Wed, 1 Sep 2021 08:17:21 -0700
From:   Daeho Jeong <daeho43@...il.com>
To:     Chao Yu <chao@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com,
        Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [f2fs-dev] [PATCH v3] f2fs: introduce fragment allocation mode
 mount option

>
> if (F2FS_OPTION(sbi).fs_mode == FS_MODE_FRAGMENT_SEG)?
>
> It needs to randomize position of next segment only in fragment_seg mode? IIRC.
>

I want the randomness of segment allocation in fragment:*_block mode
to simulate real filesystem fragmentation.
How about just using fragment:rand_block for the simulation. I mean we
can use segment randomness for fragment:segment and
fragment:rand_block.