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jbd2: Add function jbd2_trans_will_send_data_barrier()

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Provide a function which returns whether a transaction with given tid
will send a flush to the filesystem device.  The function will be used
by ext4 to detect whether fsync needs to send a separate flush or not.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Jan Kara
2011-05-24 11:59:18 -04:00
committed by Theodore Ts'o
parent 81be12c817
commit bbd2be3691
3 changed files with 53 additions and 2 deletions
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fs/jbd2/commit.c
+9 -1
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@@ -677,6 +677,10 @@ start_journal_io:
err = 0;
}
write_lock(&journal->j_state_lock);
J_ASSERT(commit_transaction->t_state == T_COMMIT);
commit_transaction->t_state = T_COMMIT_DFLUSH;
write_unlock(&journal->j_state_lock);
/*
* If the journal is not located on the file system device,
* then we must flush the file system device before we issue
@@ -804,6 +808,10 @@ wait_for_iobuf:
jbd2_journal_abort(journal, err);
jbd_debug(3, "JBD: commit phase 5\n");
write_lock(&journal->j_state_lock);
J_ASSERT(commit_transaction->t_state == T_COMMIT_DFLUSH);
commit_transaction->t_state = T_COMMIT_JFLUSH;
write_unlock(&journal->j_state_lock);
if (!JBD2_HAS_INCOMPAT_FEATURE(journal,
JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) {
@@ -959,7 +967,7 @@ restart_loop:
jbd_debug(3, "JBD: commit phase 7\n");
J_ASSERT(commit_transaction->t_state == T_COMMIT);
J_ASSERT(commit_transaction->t_state == T_COMMIT_JFLUSH);
commit_transaction->t_start = jiffies;
stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging,