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authorJan Kara <jack@suse.cz>2010-04-15 22:16:24 +0200
committerJan Kara <jack@suse.cz>2010-05-21 19:30:40 +0200
commit03f4d804a1b4748885dc4613a4afe10089a731c8 (patch)
treef2d7be9a0205496f14d61e6a8fe62277e653fab8 /fs/jbd/journal.c
parent311b9549ed2bb0f2c2257781c3e88cb00505e80e (diff)
downloadlinux-03f4d804a1b4748885dc4613a4afe10089a731c8.tar.bz2
jbd: Provide function to check whether transaction will issue data barrier
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>
Diffstat (limited to 'fs/jbd/journal.c')
-rw-r--r--fs/jbd/journal.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index bd224eec9b07..99c71940155a 100644
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -565,6 +565,38 @@ int log_wait_commit(journal_t *journal, tid_t tid)
}
/*
+ * 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);