diff options
| author | Jan Kara <jack@suse.cz> | 2021-04-06 18:18:00 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2021-04-09 21:19:33 -0400 |
| commit | 83fe6b18b8d04c6c849379005e1679bac9752466 (patch) | |
| tree | 535b2010b4f2a1bc0333c7d67e570befd0bfc361 /fs | |
| parent | 3b1833e92baba135923af4a07e73fe6e54be5a2f (diff) | |
ext4: annotate data race in jbd2_journal_dirty_metadata()
Assertion checks in jbd2_journal_dirty_metadata() are known to be racy
but we don't want to be grabbing locks just for them. We thus recheck
them under b_state_lock only if it looks like they would fail. Annotate
the checks with data_race().
Cc: stable@kernel.org
Reported-by: Hao Sun <sunhao.th@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20210406161804.20150-2-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/jbd2/transaction.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c index 398d1d9209e2..e8fc45fd751f 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -1479,8 +1479,8 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh) * crucial to catch bugs so let's do a reliable check until the * lockless handling is fully proven. */ - if (jh->b_transaction != transaction && - jh->b_next_transaction != transaction) { + if (data_race(jh->b_transaction != transaction && + jh->b_next_transaction != transaction)) { spin_lock(&jh->b_state_lock); J_ASSERT_JH(jh, jh->b_transaction == transaction || jh->b_next_transaction == transaction); @@ -1488,8 +1488,8 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh) } if (jh->b_modified == 1) { /* If it's in our transaction it must be in BJ_Metadata list. */ - if (jh->b_transaction == transaction && - jh->b_jlist != BJ_Metadata) { + if (data_race(jh->b_transaction == transaction && + jh->b_jlist != BJ_Metadata)) { spin_lock(&jh->b_state_lock); if (jh->b_transaction == transaction && jh->b_jlist != BJ_Metadata) |