xfs: add hot tracking support.

From: Dave Chinner <dchinner@redhat.com>

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

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

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HI, Dave,

I guess that you should add some hot tracking stuff in some
xfs_show_xxx function, right?

On Tue, Oct 16, 2012 at 8:04 AM, Dave Chinner <david@fromorbit.com> wrote:
>
> From: Dave Chinner <dchinner@redhat.com>
>
> Connect up the VFS hot tracking support so XFS filesystems can make
> use of it.
>
> Signed-off-by: Dave Chinner <dchinner@redhat.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;
>

On Wed, Nov 07, 2012 at 04:38:23PM +0800, Zhi Yong Wu wrote:
> HI, Dave,
> 
> I guess that you should add some hot tracking stuff in some
> xfs_show_xxx function, right?

Yes, it should - I thought I did that. I recall seeing int
/proc/mounts, but maybe I was just hallucinating. I'll send an
updated version when I get to fixing it.

Cheers,

Dave.