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jbd: Provide function to check whether transaction will issue data barrier

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Provide a function which returns whether a transaction with given tid
will send a barrier to the filesystem device. The function will be used
by ext3 to detect whether fsync needs to send a separate barrier or not.

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara
2010-04-15 22:16:24 +02:00
parent 311b9549ed
commit 03f4d804a1
3 changed files with 42 additions and 2 deletions
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33
fs/jbd/journal.c
View File

@@ -564,6 +564,38 @@ int log_wait_commit(journal_t *journal, tid_t tid)
return err;
}
/*
* Return 1 if a given transaction has not yet sent barrier request
* connected with a transaction commit. If 0 is returned, transaction
* may or may not have sent the barrier. Used to avoid sending barrier
* twice in common cases.
*/
int journal_trans_will_send_data_barrier(journal_t *journal, tid_t tid)
{
int ret = 0;
transaction_t *commit_trans;
if (!(journal->j_flags & JFS_BARRIER))
return 0;
spin_lock(&journal->j_state_lock);
/* Transaction already committed? */
if (tid_geq(journal->j_commit_sequence, tid))
goto out;
/*
* Transaction is being committed and we already proceeded to
* writing commit record?
*/
commit_trans = journal->j_committing_transaction;
if (commit_trans && commit_trans->t_tid == tid &&
commit_trans->t_state >= T_COMMIT_RECORD)
goto out;
ret = 1;
out:
spin_unlock(&journal->j_state_lock);
return ret;
}
EXPORT_SYMBOL(journal_commit_will_send_barrier);
/*
* Log buffer allocation routines:
*/
@@ -1157,6 +1189,7 @@ int journal_destroy(journal_t *journal)
{
int err = 0;
/* Wait for the commit thread to wake up and die. */
journal_kill_thread(journal);