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jbd2: fix up sparse warnings in checkpoint code

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Add missing __acquires() and __releases() annotations.  Also, in an
"this should never happen" WARN_ON check, if it *does* actually
happen, we need to release j_state_lock since this function is always
supposed to release that lock.  Otherwise, things will quickly grind
to a halt after the WARN_ON trips.

Fixes: 96f1e09745 ("jbd2: avoid long hold times of j_state_lock...")
Cc: stable@kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2020-11-07 00:00:49 -05:00
parent fa329e2731
commit 05d5233df8
2 changed files with 5 additions and 1 deletions
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2
fs/jbd2/checkpoint.c
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@ -106,6 +106,8 @@ static int __try_to_free_cp_buf(struct journal_head *jh)
* for a checkpoint to free up some space in the log.
*/
void __jbd2_log_wait_for_space(journal_t *journal)
__acquires(&journal->j_state_lock)
__releases(&journal->j_state_lock)
{
int nblocks, space_left;
/* assert_spin_locked(&journal->j_state_lock); */

4
fs/jbd2/transaction.c
View File

@ -195,8 +195,10 @@ static void wait_transaction_switching(journal_t *journal)
DEFINE_WAIT(wait);
if (WARN_ON(!journal->j_running_transaction ||
journal->j_running_transaction->t_state != T_SWITCH))
journal->j_running_transaction->t_state != T_SWITCH)) {
read_unlock(&journal->j_state_lock);
return;
}
prepare_to_wait(&journal->j_wait_transaction_locked, &wait,
TASK_UNINTERRUPTIBLE);
read_unlock(&journal->j_state_lock);