linux-ext4 - [PATCH] ext4: Enable asynchronous commits by default

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Date:	Sat, 20 Sep 2008 20:53:47 -0400
From:	"Theodore Ts'o" <tytso@....edu>
To:	linux-ext4@...r.kernel.org
Subject: [PATCH] ext4: Enable asynchronous commits by default


Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index fb5766e..e6d5af7 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -747,8 +747,15 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
 	 */
 	seq_puts(seq, ",barrier=");
 	seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
+	/* journal_async_commit enables journal_checksum internally */
 	if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
 		seq_puts(seq, ",journal_async_commit");
+	else {
+		seq_puts(seq, ",journal_sync_commit");
+		if (test_opt(sb, JOURNAL_CHECKSUM))
+			seq_puts(seq, ",journal_checksum");
+	}
+
 	if (test_opt(sb, NOBH))
 		seq_puts(seq, ",nobh");
 	if (!test_opt(sb, EXTENTS))
@@ -902,6 +909,7 @@ enum {
 	Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 	Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 	Opt_journal_checksum, Opt_journal_async_commit,
+	Opt_journal_sync_commit,
 	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
@@ -944,6 +952,7 @@ static match_table_t tokens = {
 	{Opt_journal_dev, "journal_dev=%u"},
 	{Opt_journal_checksum, "journal_checksum"},
 	{Opt_journal_async_commit, "journal_async_commit"},
+	{Opt_journal_sync_commit, "journal_sync_commit"},
 	{Opt_abort, "abort"},
 	{Opt_data_journal, "data=journal"},
 	{Opt_data_ordered, "data=ordered"},
@@ -1145,7 +1154,9 @@ static int parse_options(char *options, struct super_block *sb,
 			break;
 		case Opt_journal_async_commit:
 			set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
-			set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
+			break;
+		case Opt_journal_sync_commit:
+			clear_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
 			break;
 		case Opt_noload:
 			set_opt(sbi->s_mount_opt, NOLOAD);
@@ -2026,6 +2037,11 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	 */
 	set_opt(sbi->s_mount_opt, DELALLOC);
 
+	/*
+	 * enable async commit by default
+	 * Use -o sync_commit to turn it off
+	 */
+	set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
 
 	if (!parse_options((char *) data, sb, &journal_inum, &journal_devnum,
 			   NULL, 0))
--
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