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Date:   Sun, 11 Jun 2023 23:49:00 -0400
From:   "Theodore Ts'o" <tytso@mit.edu>
To:     Kemeng Shi <shikemeng@huaweicloud.com>
Cc:     adilger.kernel@dilger.ca, ojaswin@linux.ibm.com,
        linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 13/19] ext4: call ext4_mb_mark_group_bb in
 ext4_free_blocks_simple
Message-ID: <20230612034900.GI1436857@mit.edu>
References: <20230603150327.3596033-1-shikemeng@huaweicloud.com>
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 <20230611050532.GE1436857@mit.edu>
 <cd236fdb-c48c-69b0-10a3-3df8a34f0a6e@huaweicloud.com>
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On Mon, Jun 12, 2023 at 10:24:55AM +0800, Kemeng Shi wrote:

> Hi ted, sorry for this issue. This patch added a WARN_ON for case that we free block
> to uninitialized block group which should be invalid.
> We can simply remove the WARN_ON to allow free on uninitialized block group as old
> way for emergency fix and I will find out why we free blocks to uninitialized block
> group in fast commit code path and is it a valid behavior.

What I've done for now in the dev branch was to drop patches 12
through 19 of this patch series.  That seemed to be a good break
point, and I wanted to make sure we had something working so we can
start doing a lot more intesive testing on the patches so far.

Also, that way, when you resend the last 8 patches in the patch
series, we can make sure they get a proper review as opposed to making
changes on the fly.

The current contents of the dev branch are:

% git log --reverse --oneline origin..dev
40fa8be3852f ext4: kill unused function ext4_journalled_write_inline_data
a030569c34be ext4: Change remaining tracepoints to use folio
d1ffc6fb5ded ext4: Make mpage_journal_page_buffers use folio
5ac99c22fa84 ext4: Make ext4_write_inline_data_end() use folio
d578dfc510cf ext4: Call fsverity_verify_folio()
30f0bd64ed09 ext4: fix wrong unit use in ext4_mb_normalize_request
b9dc976cc348 ext4: fix unit mismatch in ext4_mb_new_blocks_simple
9afc5e21107a ext4: fix wrong unit use in ext4_mb_find_by_goal
860f86ccff6e ext4: treat stripe in block unit
710c384f1536 ext4: add EXT4_MB_HINT_GOAL_ONLY test in ext4_mb_use_preallocated
f242d8a98a6f ext4: remove ext4_block_group and ext4_block_group_offset declaration
5b859728b98b ext4: try all groups in ext4_mb_new_blocks_simple
ea7bbd168135 ext4: get block from bh before pass it to ext4_free_blocks_simple in ext4_free_blocks
757d9100a5d1 ext4: remove unsed parameter and unnecessary forward declaration of ext4_mb_new_blocks_simple
5d62e6da25f5 ext4: fix wrong unit use in ext4_mb_clear_bb
993d22f0a250 ext4: fix wrong unit use in ext4_mb_new_blocks
bf4f2aa4844a ext4: mballoc: Remove useless setting of ac_criteria
743f4dd07bf9 ext4: Remove unused extern variables declaration
bc40109767b3 ext4: Convert mballoc cr (criteria) to enum
52e3814a1342 ext4: Add per CR extent scanned counter
a15c09da1255 ext4: Add counter to track successful allocation of goal length
26cbe38f0275 ext4: Avoid scanning smaller extents in BG during CR1
9c8f8195852c ext4: Don't skip prefetching BLOCK_UNINIT groups
cd303d98b9b5 ext4: Ensure ext4_mb_prefetch_fini() is called for all prefetched BGs
ea639ce794e5 ext4: Abstract out logic to search average fragment list
b080c84db854 ext4: Add allocation criteria 1.5 (CR1_5)
3a08f7ac3bfa ext4: Give symbolic names to mballoc criterias
d14b5d0b1373 ext4: only update i_reserved_data_blocks on successful block allocation
b352d1f09a20 ext4: add a new helper to check if es must be kept
579c020ea7b7 ext4: factor out __es_alloc_extent() and __es_free_extent()
f4ddcde91d00 ext4: use pre-allocated es in __es_insert_extent()
e77481862663 ext4: use pre-allocated es in __es_remove_extent()
28774513875c ext4: using nofail preallocation in ext4_es_remove_extent()
e109a1db5b09 ext4: using nofail preallocation in ext4_es_insert_delayed_block()
14d876070f03 ext4: using nofail preallocation in ext4_es_insert_extent()
2af6f615b18b ext4: make ext4_es_remove_extent() return void
0ee9cccd1971 ext4: make ext4_es_insert_delayed_block() return void
7a7c285c485d ext4: make ext4_es_insert_extent() return void
9d1c6dea1aa3 ext4: make ext4_zeroout_es() return void
2e3f4cdef544 ext4: clean up mballoc criteria comments
acef67482edf ext4: allow concurrent unaligned dio overwrites
63bc068f0d1a ext4: Fix reusing stale buffer heads from last failed mounting
3a57c2f88be3 ext4: ext4_put_super: Remove redundant checking for 'sbi->s_journal_bdev'
6b960d2155f9 jbd2: remove unused feature macros
4b049709e652 jbd2: switch to check format version in superblock directly
d9eafe0afafa jbd2: factor out journal initialization from journal_get_superblock()
6eecd1f4c7ef jbd2: remove j_format_version
431ca11fafd3 jbd2: continue to record log between each mount
2ea31402649c ext4: add journal cycled recording support
a228f0e153f6 ext4: update doc about journal superblock description
f9c45d83f4da ext4: turning quotas off if mount failed after enable quotas
5404e4738054 ext4: refactoring to use the unified helper ext4_quotas_off()
d3ab1bca26b4 jbd2: recheck chechpointing non-dirty buffer
7b0cfe40a991 jbd2: remove t_checkpoint_io_list
e86f802ab8d4 jbd2: remove journal_clean_one_cp_list()
e8ece5c78f36 jbd2: Fix wrongly judgement for buffer head removing while doing checkpoint
cdffaad9649e jbd2: fix a race when checking checkpoint buffer busy
11761ed6026e jbd2: remove __journal_try_to_free_buffer()

Cheers,

					- Ted