From: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
To: Kemeng Shi <shikemeng@huaweicloud.com>,
tytso@mit.edu, adilger.kernel@dilger.ca
Cc: ojaswin@linux.ibm.com, linux-ext4@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 05/12] ext4: call ext4_mb_mark_context in ext4_mb_mark_diskspace_used
Date: Wed, 27 Sep 2023 15:28:34 +0530 [thread overview]
Message-ID: <87r0mkey45.fsf@doe.com> (raw)
In-Reply-To: <20230919201532.310085-6-shikemeng@huaweicloud.com>
Kemeng Shi <shikemeng@huaweicloud.com> writes:
> call ext4_mb_mark_context in ext4_mb_mark_diskspace_used to:
> 1. remove repeat code to normally update bitmap and group descriptor
> on disk.
> 2. call ext4_mb_mark_context instead of only setting bits in block bitmap
> to fix the bitmap. Function ext4_mb_mark_context will also update
> checksum of bitmap and other counter along with the bit change to keep
> the cosistent with bit change or block bitmap will be marked corrupted as
> checksum of bitmap is in inconsistent state.
>
Rewording point 2 to...
Now that we have a common API for marking blocks inuse/free in block
bitmap, use that instead of open coding it in function
ext4_mb_mark_diskspace_used(). The current code was not updating
checksum and other counters. ext4_mb_mark_context() should fix these
consistency problems.
Also I now see why you have used "int" (ext4_grpblk_t) for len in
ext4_mb_mark_context(). The reason is because this is "cluster len" which
is defined as ext4_grpblk_t in "struct ext4_free_extent"
I think by default we anyway have 8192 blocks per block group. So it
should be ok for now. I anyway think the usage of blocks and cluster (&
their data type) is confusing at different places which needs an auditing/cleanup.
This patch looks good to me. Feel free to add -
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
next prev parent reply other threads:[~2023-09-27 9:58 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-19 20:15 [PATCH v7 00/12] cleanups and unit test for mballoc Kemeng Shi
2023-09-19 20:15 ` [PATCH v7 01/12] ext4: make state in ext4_mb_mark_bb to be bool Kemeng Shi
2023-09-27 6:10 ` Ritesh Harjani
2023-09-27 6:51 ` Kemeng Shi
2023-09-19 20:15 ` [PATCH v7 02/12] ext4: factor out codes to update block bitmap and group descriptor on disk from ext4_mb_mark_bb Kemeng Shi
2023-09-27 8:49 ` Ritesh Harjani
2023-09-28 3:31 ` Kemeng Shi
2023-09-28 4:42 ` Ritesh Harjani
2023-09-28 7:45 ` Kemeng Shi
2023-09-19 20:15 ` [PATCH v7 03/12] ext4: call ext4_mb_mark_context in ext4_free_blocks_simple Kemeng Shi
2023-09-27 8:52 ` Ritesh Harjani
2023-09-19 20:15 ` [PATCH v7 04/12] ext4: extend ext4_mb_mark_context to support allocation under journal Kemeng Shi
2023-09-27 9:13 ` Ritesh Harjani
2023-09-19 20:15 ` [PATCH v7 05/12] ext4: call ext4_mb_mark_context in ext4_mb_mark_diskspace_used Kemeng Shi
2023-09-27 9:58 ` Ritesh Harjani [this message]
2023-09-19 20:15 ` [PATCH v7 06/12] ext4: Separate block bitmap and buddy bitmap freeing in ext4_mb_clear_bb() Kemeng Shi
2023-09-27 11:06 ` Ritesh Harjani
2023-09-19 20:15 ` [PATCH v7 07/12] ext4: call ext4_mb_mark_context in ext4_mb_clear_bb Kemeng Shi
2023-09-27 11:14 ` Ritesh Harjani
2023-09-19 20:15 ` [PATCH v7 08/12] ext4: Separate block bitmap and buddy bitmap freeing in ext4_group_add_blocks() Kemeng Shi
2023-09-27 11:16 ` Ritesh Harjani
2023-09-19 20:15 ` [PATCH v7 09/12] ext4: call ext4_mb_mark_context " Kemeng Shi
2023-09-27 11:19 ` Ritesh Harjani
2023-09-19 20:15 ` [PATCH v7 10/12] ext4: add some kunit stub for mballoc kunit test Kemeng Shi
2023-09-19 20:15 ` [PATCH v7 11/12] ext4: add first unit test for ext4_mb_new_blocks_simple in mballoc Kemeng Shi
2023-09-27 11:39 ` Ritesh Harjani
2023-09-19 20:15 ` [PATCH v7 12/12] ext4: run mballoc test with different layouts setting Kemeng Shi
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