linux-kernel - [PATCH] xfs: add hot tracking support.

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Message-ID: <20121016000405.GA2864@dastard>
Date:	Tue, 16 Oct 2012 11:04:05 +1100
From:	Dave Chinner <david@...morbit.com>
To:	zwu.kernel@...il.com
Cc:	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	linuxram@...ux.vnet.ibm.com, viro@...iv.linux.org.uk,
	dave@...os.cz, tytso@....edu, cmm@...ibm.com,
	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: [PATCH] xfs: add hot tracking support.


From: Dave Chinner <dchinner@...hat.com>

Connect up the VFS hot tracking support so XFS filesystems can make
use of it.

Signed-off-by: Dave Chinner <dchinner@...hat.com>
---
 fs/xfs/xfs_mount.h |    1 +
 fs/xfs/xfs_super.c |    9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index a631ca3..d5e7277 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -215,6 +215,7 @@ typedef struct xfs_mount {
 #define XFS_MOUNT_WSYNC		(1ULL << 0)	/* for nfs - all metadata ops
 						   must be synchronous except
 						   for space allocations */
+#define XFS_MOUNT_HOTTRACK	(1ULL << 1)	/* hot inode tracking */
 #define XFS_MOUNT_WAS_CLEAN	(1ULL << 3)
 #define XFS_MOUNT_FS_SHUTDOWN	(1ULL << 4)	/* atomic stop of all filesystem
 						   operations, typically for
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 56c2537..17786ff 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -61,6 +61,7 @@
 #include <linux/kthread.h>
 #include <linux/freezer.h>
 #include <linux/parser.h>
+#include <linux/hot_tracking.h>
 
 static const struct super_operations xfs_super_operations;
 static kmem_zone_t *xfs_ioend_zone;
@@ -114,6 +115,7 @@ mempool_t *xfs_ioend_pool;
 #define MNTOPT_NODELAYLOG  "nodelaylog"	/* Delayed logging disabled */
 #define MNTOPT_DISCARD	   "discard"	/* Discard unused blocks */
 #define MNTOPT_NODISCARD   "nodiscard"	/* Do not discard unused blocks */
+#define MNTOPT_HOTTRACK	"hot_track"	/* hot inode tracking */
 
 /*
  * Table driven mount option parser.
@@ -371,6 +373,8 @@ xfs_parseargs(
 			mp->m_flags |= XFS_MOUNT_DISCARD;
 		} else if (!strcmp(this_char, MNTOPT_NODISCARD)) {
 			mp->m_flags &= ~XFS_MOUNT_DISCARD;
+		} else if (!strcmp(this_char, MNTOPT_HOTTRACK)) {
+			mp->m_flags |= XFS_MOUNT_HOTTRACK;
 		} else if (!strcmp(this_char, "ihashsize")) {
 			xfs_warn(mp,
 	"ihashsize no longer used, option is deprecated.");
@@ -1040,6 +1044,9 @@ xfs_fs_put_super(
 {
 	struct xfs_mount	*mp = XFS_M(sb);
 
+	if (mp->m_flags & XFS_MOUNT_HOTTRACK)
+		hot_track_exit(sb);
+
 	xfs_filestream_unmount(mp);
 	xfs_unmountfs(mp);
 
@@ -1470,6 +1477,8 @@ xfs_fs_fill_super(
 		error = ENOMEM;
 		goto out_unmount;
 	}
+	if (mp->m_flags & XFS_MOUNT_HOTTRACK)
+		hot_track_init(sb);
 
 	return 0;
 
--
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