From: Dave Chinner <redacted>

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

Signed-off-by: Dave Chinner <redacted>
---
 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;