Commit e03a9976 authored by Jan Kara's avatar Jan Kara Committed by Theodore Ts'o

jbd2: fix lockdep annotation in add_transaction_credits()

Thomas has reported a lockdep splat hitting in
add_transaction_credits(). The problem is that that function calls
jbd2_might_wait_for_commit() while holding j_state_lock which is wrong
(we do not really wait for transaction commit while holding that lock).

Fix the problem by moving jbd2_might_wait_for_commit() into places where
we are ready to wait for transaction commit and thus j_state_lock is
unlocked.

Cc: stable@vger.kernel.org
Fixes: 1eaa566dReported-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent 7c5f6b32
...@@ -159,6 +159,7 @@ static void wait_transaction_locked(journal_t *journal) ...@@ -159,6 +159,7 @@ static void wait_transaction_locked(journal_t *journal)
read_unlock(&journal->j_state_lock); read_unlock(&journal->j_state_lock);
if (need_to_start) if (need_to_start)
jbd2_log_start_commit(journal, tid); jbd2_log_start_commit(journal, tid);
jbd2_might_wait_for_commit(journal);
schedule(); schedule();
finish_wait(&journal->j_wait_transaction_locked, &wait); finish_wait(&journal->j_wait_transaction_locked, &wait);
} }
...@@ -182,8 +183,6 @@ static int add_transaction_credits(journal_t *journal, int blocks, ...@@ -182,8 +183,6 @@ static int add_transaction_credits(journal_t *journal, int blocks,
int needed; int needed;
int total = blocks + rsv_blocks; int total = blocks + rsv_blocks;
jbd2_might_wait_for_commit(journal);
/* /*
* If the current transaction is locked down for commit, wait * If the current transaction is locked down for commit, wait
* for the lock to be released. * for the lock to be released.
...@@ -214,6 +213,7 @@ static int add_transaction_credits(journal_t *journal, int blocks, ...@@ -214,6 +213,7 @@ static int add_transaction_credits(journal_t *journal, int blocks,
if (atomic_read(&journal->j_reserved_credits) + total > if (atomic_read(&journal->j_reserved_credits) + total >
journal->j_max_transaction_buffers) { journal->j_max_transaction_buffers) {
read_unlock(&journal->j_state_lock); read_unlock(&journal->j_state_lock);
jbd2_might_wait_for_commit(journal);
wait_event(journal->j_wait_reserved, wait_event(journal->j_wait_reserved,
atomic_read(&journal->j_reserved_credits) + total <= atomic_read(&journal->j_reserved_credits) + total <=
journal->j_max_transaction_buffers); journal->j_max_transaction_buffers);
...@@ -238,6 +238,7 @@ static int add_transaction_credits(journal_t *journal, int blocks, ...@@ -238,6 +238,7 @@ static int add_transaction_credits(journal_t *journal, int blocks,
if (jbd2_log_space_left(journal) < jbd2_space_needed(journal)) { if (jbd2_log_space_left(journal) < jbd2_space_needed(journal)) {
atomic_sub(total, &t->t_outstanding_credits); atomic_sub(total, &t->t_outstanding_credits);
read_unlock(&journal->j_state_lock); read_unlock(&journal->j_state_lock);
jbd2_might_wait_for_commit(journal);
write_lock(&journal->j_state_lock); write_lock(&journal->j_state_lock);
if (jbd2_log_space_left(journal) < jbd2_space_needed(journal)) if (jbd2_log_space_left(journal) < jbd2_space_needed(journal))
__jbd2_log_wait_for_space(journal); __jbd2_log_wait_for_space(journal);
...@@ -255,6 +256,7 @@ static int add_transaction_credits(journal_t *journal, int blocks, ...@@ -255,6 +256,7 @@ static int add_transaction_credits(journal_t *journal, int blocks,
sub_reserved_credits(journal, rsv_blocks); sub_reserved_credits(journal, rsv_blocks);
atomic_sub(total, &t->t_outstanding_credits); atomic_sub(total, &t->t_outstanding_credits);
read_unlock(&journal->j_state_lock); read_unlock(&journal->j_state_lock);
jbd2_might_wait_for_commit(journal);
wait_event(journal->j_wait_reserved, wait_event(journal->j_wait_reserved,
atomic_read(&journal->j_reserved_credits) + rsv_blocks atomic_read(&journal->j_reserved_credits) + rsv_blocks
<= journal->j_max_transaction_buffers / 2); <= journal->j_max_transaction_buffers / 2);
......
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