From: David Chinner <dgc@sgi.com>
Date: Thu, 17 Apr 2008 06:49:55 +0000 (+1000)
Subject: [XFS] Remove periodic logging of in-core superblock counters.
X-Git-Tag: v2.6.26-rc1~1147^2~9
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=7e20694d91f817f8e9f62404aca793ae0df4d98a;p=linux-2.6-omap-h63xx.git

[XFS] Remove periodic logging of in-core superblock counters.

xfssyncd triggers the logging of superblock counters every 30s if the
filesystem is made with lazy-count=1. This will prevent disks from idling
and spinning down as there will be a log write every 30s. With the way
counter recovery works for lazy-count=1, this code is unnecessary and
provides no real benefit, so just remove it.

SGI-PV: 980145
SGI-Modid: xfs-linux-melb:xfs-kern:30840a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Barry Naujok <bnaujok@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
---

diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index fb561beea37..865eb708aa9 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -1028,8 +1028,7 @@ xfs_sync_worker(
 	int		error;
 
 	if (!(mp->m_flags & XFS_MOUNT_RDONLY))
-		error = xfs_sync(mp, SYNC_FSDATA | SYNC_BDFLUSH | SYNC_ATTR |
-				     SYNC_REFCACHE | SYNC_SUPER);
+		error = xfs_sync(mp, SYNC_FSDATA | SYNC_BDFLUSH | SYNC_ATTR);
 	mp->m_sync_seq++;
 	wake_up(&mp->m_wait_single_sync_task);
 }
diff --git a/fs/xfs/linux-2.6/xfs_vfs.h b/fs/xfs/linux-2.6/xfs_vfs.h
index 4da03a4e352..7e60c7776b1 100644
--- a/fs/xfs/linux-2.6/xfs_vfs.h
+++ b/fs/xfs/linux-2.6/xfs_vfs.h
@@ -49,7 +49,6 @@ typedef struct bhv_vfs_sync_work {
 #define SYNC_REFCACHE		0x0040  /* prune some of the nfs ref cache */
 #define SYNC_REMOUNT		0x0080  /* remount readonly, no dummy LRs */
 #define SYNC_IOWAIT		0x0100  /* wait for all I/O to complete */
-#define SYNC_SUPER		0x0200  /* flush superblock to disk */
 
 /*
  * When remounting a filesystem read-only or freezing the filesystem,
diff --git a/fs/xfs/xfs_vfsops.c b/fs/xfs/xfs_vfsops.c
index 09e186d02c1..fc48158fe47 100644
--- a/fs/xfs/xfs_vfsops.c
+++ b/fs/xfs/xfs_vfsops.c
@@ -1316,22 +1316,9 @@ xfs_syncsub(
 		}
 	}
 
-	/*
-	 * If asked, update the disk superblock with incore counter values if we
-	 * are using non-persistent counters so that they don't get too far out
-	 * of sync if we crash or get a forced shutdown. We don't want to force
-	 * this to disk, just get a transaction into the iclogs....
-	 */
-	if (flags & SYNC_SUPER) {
-		error = xfs_log_sbcount(mp, 0);
-		if (error)
-			last_error = error;
-	}
-
 	/*
 	 * Now check to see if the log needs a "dummy" transaction.
 	 */
-
 	if (!(flags & SYNC_REMOUNT) && xfs_log_need_covered(mp)) {
 		xfs_trans_t *tp;
 		xfs_inode_t *ip;