ocfs2: add a mount option journal_async_commit on ocfs2 filesystem

Add a mount option to support JBD2 feature:

JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT.  When this feature is opened, journal
commit block can be written to disk without waiting for descriptor blocks,
which can improve journal commit performance.  This option will enable
'journal_checksum' internally.

Using the fs_mark benchmark, using journal_async_commit shows a 50%
improvement, the files per second go up from 215.2 to 317.5.

test script:
fs_mark  -d  /mnt/ocfs2/  -s  10240  -n  1000

default:
FSUse%        Count         Size    Files/sec     App Overhead
     0         1000        10240        215.2            17878

with journal_async_commit option:
FSUse%        Count         Size    Files/sec     App Overhead
     0         1000        10240        317.5            17881

Signed-off-by: Alex Chen <alex.chen@huawei.com>
Signed-off-by: Weiwei Wang <wangww631@huawei.comm>
Reviewed-by: Joseph Qi <joseph.qi@huawei.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/filesystems/ocfs2.txt b/Documentation/filesystems/ocfs2.txt
index 7618a28..28f8c08 100644 (file)
--- a/Documentation/filesystems/ocfs2.txt
+++ b/Documentation/filesystems/ocfs2.txt
@@ -100,3 +100,7 @@ coherency=full  (*) Disallow concurrent O_DIRECT writes, cluster inode
 coherency=buffered     Allow concurrent O_DIRECT writes without EX lock among
                        nodes, which gains high performance at risk of getting
                        stale data on other nodes.
+journal_async_commit   Commit block can be written to disk without waiting
+                       for descriptor blocks. If enabled older kernels cannot
+                       mount the device. This will enable 'journal_checksum'
+                       internally.

diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 7d6b7d0..fdbcbfe 100644 (file)
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -279,6 +279,8 @@ enum ocfs2_mount_options
                                                     writes */
        OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */
        OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */
+
+       OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT = 1 << 15,  /* Journal Async Commit */
 };
 
 #define OCFS2_OSB_SOFT_RO      0x0001

diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 8372317..c09d6da 100644 (file)
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -191,6 +191,7 @@ enum {
        Opt_coherency_full,
        Opt_resv_level,
        Opt_dir_resv_level,
+       Opt_journal_async_commit,
        Opt_err,
 };
 
@@ -222,6 +223,7 @@ static const match_table_t tokens = {
        {Opt_coherency_full, "coherency=full"},
        {Opt_resv_level, "resv_level=%u"},
        {Opt_dir_resv_level, "dir_resv_level=%u"},
+       {Opt_journal_async_commit, "journal_async_commit"},
        {Opt_err, NULL}
 };
 
@@ -1500,6 +1502,9 @@ static int ocfs2_parse_options(struct super_block *sb,
                            option < OCFS2_MAX_RESV_LEVEL)
                                mopt->dir_resv_level = option;
                        break;
+               case Opt_journal_async_commit:
+                       mopt->mount_opt |= OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT;
+                       break;
                default:
                        mlog(ML_ERROR,
                             "Unrecognized mount option \"%s\" "
@@ -1606,6 +1611,9 @@ static int ocfs2_show_options(struct seq_file *s, struct dentry *root)
        if (osb->osb_dir_resv_level != osb->osb_resv_level)
                seq_printf(s, ",dir_resv_level=%d", osb->osb_resv_level);
 
+       if (opts & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)
+               seq_printf(s, ",journal_async_commit");
+
        return 0;
 }
 
@@ -2475,6 +2483,15 @@ static int ocfs2_check_volume(struct ocfs2_super *osb)
                goto finally;
        }
 
+       if (osb->s_mount_opt & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)
+               jbd2_journal_set_features(osb->journal->j_journal,
+                               JBD2_FEATURE_COMPAT_CHECKSUM, 0,
+                               JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
+       else
+               jbd2_journal_clear_features(osb->journal->j_journal,
+                               JBD2_FEATURE_COMPAT_CHECKSUM, 0,
+                               JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
+
        if (dirty) {
                /* recover my local alloc if we didn't unmount cleanly. */
                status = ocfs2_begin_local_alloc_recovery(osb,