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| author | Christoph Hellwig <hch@lst.de> | 2023-08-02 17:41:28 +0200 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2023-08-11 13:15:04 +0200 |
| commit | 6f5fc7de98857c75dad05e9f3fe2e6f358d4583e (patch) | |
| tree | e3dd210e527ecafeb683ba7543e5e283a2cb05f7 /fs/ext4/super.c | |
| parent | 7ecd0b6f510005e120f5bc198bacb5951814cf36 (diff) | |
| download | linux-6f5fc7de98857c75dad05e9f3fe2e6f358d4583e.tar.gz linux-6f5fc7de98857c75dad05e9f3fe2e6f358d4583e.tar.bz2 linux-6f5fc7de98857c75dad05e9f3fe2e6f358d4583e.zip | |
ext4: drop s_umount over opening the log device
Just like get_tree_bdev needs to drop s_umount when opening the main
device, we need to do the same for the ext4 log device to avoid a
potential lock order reversal with s_unmount for the mark_dead path.
It might be preferable to just drop s_umount over ->fill_super entirely,
but that will require a fairly massive audit first, so we'll do the easy
version here first.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Message-Id: <20230802154131.2221419-10-hch@lst.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/ext4/super.c')
| -rw-r--r-- | fs/ext4/super.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index fa8888f0fed9..47e3272e0c5b 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -5842,7 +5842,10 @@ static journal_t *ext4_get_dev_journal(struct super_block *sb, if (WARN_ON_ONCE(!ext4_has_feature_journal(sb))) return NULL; + /* see get_tree_bdev why this is needed and safe */ + up_write(&sb->s_umount); bdev = ext4_blkdev_get(j_dev, sb); + down_write(&sb->s_umount); if (bdev == NULL) return NULL; |