6.12-stable review patch. If anyone has any objections, please let me know.
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From: Byungchul Park byungchul@sk.com
commit 40a71b53d5a6d4ea17e4d54b99b2ac03a7f5e783 upstream.
jbd2 journal handling code doesn't want jbd2_might_wait_for_commit() to be placed between start_this_handle() and stop_this_handle(). So it marks the region with rwsem_acquire_read() and rwsem_release().
However, the annotation is too strong for that purpose. We don't have to use more than try lock annotation for that.
rwsem_acquire_read() implies:
1. might be a waiter on contention of the lock. 2. enter to the critical section of the lock.
All we need in here is to act 2, not 1. So trylock version of annotation is sufficient for that purpose. Now that dept partially relies on lockdep annotaions, dept interpets rwsem_acquire_read() as a potential wait and might report a deadlock by the wait.
Replace it with trylock version of annotation.
Signed-off-by: Byungchul Park byungchul@sk.com Reviewed-by: Jan Kara jack@suse.cz Cc: stable@kernel.org Message-ID: 20251024073940.1063-1-byungchul@sk.com Signed-off-by: Theodore Ts'o tytso@mit.edu Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/jbd2/transaction.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -445,7 +445,7 @@ repeat: read_unlock(&journal->j_state_lock); current->journal_info = handle;
- rwsem_acquire_read(&journal->j_trans_commit_map, 0, 0, _THIS_IP_); + rwsem_acquire_read(&journal->j_trans_commit_map, 0, 1, _THIS_IP_); jbd2_journal_free_transaction(new_transaction); /* * Ensure that no allocations done while the transaction is open are