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From: Zhang Yi <yi.zhang@huawei.com>
To: <linux-ext4@vger.kernel.org>
Cc: <linux-fsdevel@vger.kernel.org>, <tytso@mit.edu>,
	<adilger.kernel@dilger.ca>, <jack@suse.cz>, <yi.zhang@huawei.com>,
	<yukuai3@huawei.com>
Subject: [RFC PATCH v2 0/7]  ext4, jbd2: fix 3 issues about bdev_try_to_free_page()
Date: Wed, 14 Apr 2021 21:47:30 +0800
Message-ID: <20210414134737.2366971-1-yi.zhang@huawei.com> (raw)

Patch 1-2: fix a potential filesystem inconsistency problem.
Patch 3-7: fix two use after free problem.

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 (7):
  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: do not free buffers in jbd2_journal_try_to_free_buffers()
  ext4: use RCU to protect accessing superblock in blkdev_releasepage()
  fs: introduce a usage count into the superblock
  ext4: fix race between blkdev_releasepage() and ext4_put_super()

 fs/block_dev.c        | 13 ++++++----
 fs/ext4/inode.c       |  6 +++--
 fs/ext4/super.c       | 32 +++++++++++++++++++++----
 fs/jbd2/checkpoint.c  | 56 ++++++++++++++++++++++++-------------------
 fs/jbd2/journal.c     |  9 +++++++
 fs/jbd2/transaction.c | 32 ++++++-------------------
 include/linux/fs.h    | 29 ++++++++++++++++++++++
 include/linux/jbd2.h  |  7 ++++++
 8 files changed, 123 insertions(+), 61 deletions(-)

-- 
2.25.4


             reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-14 13:47 Zhang Yi [this message]
2021-04-14 13:47 ` [RFC PATCH v2 1/7] jbd2: remove the out label in __jbd2_journal_remove_checkpoint() Zhang Yi
2021-04-21 10:01   ` Jan Kara
2021-04-14 13:47 ` [RFC PATCH v2 2/7] jbd2: ensure abort the journal if detect IO error when writing original buffer back Zhang Yi
2021-04-21 13:20   ` Jan Kara
2021-04-14 13:47 ` [RFC PATCH v2 3/7] jbd2: don't abort the journal when freeing buffers Zhang Yi
2021-04-21 13:23   ` Jan Kara
2021-04-14 13:47 ` [RFC PATCH v2 4/7] jbd2: do not free buffers in jbd2_journal_try_to_free_buffers() Zhang Yi
2021-04-15 14:46   ` Christoph Hellwig
2021-04-14 13:47 ` [RFC PATCH v2 5/7] ext4: use RCU to protect accessing superblock in blkdev_releasepage() Zhang Yi
2021-04-15 14:48   ` Christoph Hellwig
2021-04-14 13:47 ` [RFC PATCH v2 6/7] fs: introduce a usage count into the superblock Zhang Yi
2021-04-15 14:40   ` Christoph Hellwig
2021-04-16  8:00     ` Zhang Yi
2021-04-14 13:47 ` [RFC PATCH v2 7/7] ext4: fix race between blkdev_releasepage() and ext4_put_super() Zhang Yi
2021-04-15 14:52   ` Christoph Hellwig
2021-04-16  8:00     ` Zhang Yi
2021-04-20 13:08       ` Christoph Hellwig
2021-04-21 13:46         ` Jan Kara
2021-04-21 16:57           ` Theodore Ts'o
2021-04-22  9:04             ` Jan Kara
2021-04-23 11:39               ` Zhang Yi
2021-04-23 16:06                 ` Jan Kara
2021-04-23 14:40               ` Theodore Ts'o

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