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jbd2: add sparse annotations for add_transaction_credits() 

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2021-08-14 10:54:09 -04:00
parent a5fda11338
commit b33d9f5909
1 changed files with 18 additions and 1 deletions
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19
fs/jbd2/transaction.c
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@ -223,9 +223,15 @@ static void sub_reserved_credits(journal_t *journal, int blocks)
* with j_state_lock held for reading. Returns 0 if handle joined the running
* transaction. Returns 1 if we had to wait, j_state_lock is dropped, and
* caller must retry.
*
* Note: because j_state_lock may be dropped depending on the return
* value, we need to fake out sparse so ti doesn't complain about a
* locking imbalance. Callers of add_transaction_credits will need to
* make a similar accomodation.
*/
static int add_transaction_credits(journal_t *journal, int blocks,
int rsv_blocks)
__must_hold(&journal->j_state_lock)
{
transaction_t *t = journal->j_running_transaction;
int needed;
@ -238,6 +244,7 @@ static int add_transaction_credits(journal_t *journal, int blocks,
if (t->t_state != T_RUNNING) {
WARN_ON_ONCE(t->t_state >= T_FLUSH);
wait_transaction_locked(journal);
__acquire(&journal->j_state_lock); /* fake out sparse */
return 1;
}
@ -266,10 +273,12 @@ static int add_transaction_credits(journal_t *journal, int blocks,
wait_event(journal->j_wait_reserved,
atomic_read(&journal->j_reserved_credits) + total <=
journal->j_max_transaction_buffers);
__acquire(&journal->j_state_lock); /* fake out sparse */
return 1;
}
wait_transaction_locked(journal);
__acquire(&journal->j_state_lock); /* fake out sparse */
return 1;
}
@ -293,6 +302,7 @@ static int add_transaction_credits(journal_t *journal, int blocks,
journal->j_max_transaction_buffers)
__jbd2_log_wait_for_space(journal);
write_unlock(&journal->j_state_lock);
__acquire(&journal->j_state_lock); /* fake out sparse */
return 1;
}
@ -310,6 +320,7 @@ static int add_transaction_credits(journal_t *journal, int blocks,
wait_event(journal->j_wait_reserved,
atomic_read(&journal->j_reserved_credits) + rsv_blocks
<= journal->j_max_transaction_buffers / 2);
__acquire(&journal->j_state_lock); /* fake out sparse */
return 1;
}
return 0;
@ -413,8 +424,14 @@ repeat:
if (!handle->h_reserved) {
/* We may have dropped j_state_lock - restart in that case */
if (add_transaction_credits(journal, blocks, rsv_blocks))
if (add_transaction_credits(journal, blocks, rsv_blocks)) {
/*
* add_transaction_credits releases
* j_state_lock on a non-zero return
*/
__release(&journal->j_state_lock);
goto repeat;
}
} else {
/*
* We have handle reserved so we are allowed to join T_LOCKED