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Date: Thu, 27 May 2021 21:56:33 +0800 From: Zhang Yi <yi.zhang@...wei.com> To: <linux-ext4@...r.kernel.org> CC: <tytso@....edu>, <adilger.kernel@...ger.ca>, <jack@...e.cz>, <yi.zhang@...wei.com>, <yukuai3@...wei.com> Subject: [RFC PATCH v3 0/8] ext4, jbd2: fix 3 issues about bdev_try_to_free_page() Patch 1-3: fix a potential filesystem inconsistency problem. Patch 4-8: add a shrinker to release journal_head and remove bdev_try_to_free_page() callback, and also do some cleanup. Changes since v2: - Fix some comments and spelling mistakes on patch 2 and 3. - Give up the solution of add refcount on super_block and fix the use-after-free issue in bdev_try_to_free_page(), switch to introduce a shrinker to free checkpoint buffers' journal_head and remove the whole callback at all. Thanks, Yi. --------- Changes since v1: - Do not use j_checkpoint_mutex to fix the filesystem inconsistency problem, introduce a new mark instead. - Fix superblock use-after-free issue in blkdev_releasepage(). - Avoid race between bdev_try_to_free_page() and ext4_put_super(). Zhang Yi (8): jbd2: remove the out label in __jbd2_journal_remove_checkpoint() jbd2: ensure abort the journal if detect IO error when writing original buffer back jbd2: don't abort the journal when freeing buffers jbd2: remove redundant buffer io error checks jbd2,ext4: add a shrinker to release checkpointed buffers jbd2: simplify journal_clean_one_cp_list() ext4: remove bdev_try_to_free_page() callback fs: remove bdev_try_to_free_page callback fs/block_dev.c | 15 --- fs/ext4/super.c | 29 ++---- fs/jbd2/checkpoint.c | 200 ++++++++++++++++++++++++++++++------ fs/jbd2/journal.c | 101 ++++++++++++++++++ fs/jbd2/transaction.c | 17 --- include/linux/fs.h | 1 - include/linux/jbd2.h | 37 +++++++ include/trace/events/jbd2.h | 101 ++++++++++++++++++ 8 files changed, 413 insertions(+), 88 deletions(-) -- 2.25.4
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