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authorJan Kara <jack@suse.cz>2021-04-06 18:18:00 +0200
committerTheodore Ts'o <tytso@mit.edu>2021-04-09 21:19:33 -0400
commit83fe6b18b8d04c6c849379005e1679bac9752466 (patch)
tree535b2010b4f2a1bc0333c7d67e570befd0bfc361 /fs/jbd2
parent3b1833e92baba135923af4a07e73fe6e54be5a2f (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/jbd2')
-rw-r--r--fs/jbd2/transaction.c8
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)