On Sun, Sep 23, 2012 at 08:56:29PM +0800, zwu.ker...@gmail.com wrote:
> From: Zhi Yong Wu <wu...@linux.vnet.ibm.com>
>
> Add initialization function to create some
> key data structures when hot tracking is enabled;
> Clean up them when hot tracking is disabled
>
> Signed-off-by: Zhi Yong Wu <wu...@linux.vnet.ibm.com>
> ---
> fs/hot_tracking.c | 60
> +++++++++++++++++++++++++++++++++++++++++++++++++++++
> fs/hot_tracking.h | 2 +
> fs/namespace.c | 4 +++
> fs/super.c | 6 +++++
> 4 files changed, 72 insertions(+), 0 deletions(-)
>
> diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c
> index f97e8a6..fa89f70 100644
> --- a/fs/hot_tracking.c
> +++ b/fs/hot_tracking.c
> @@ -135,6 +135,51 @@ static void hot_rb_free_hot_range_item(struct
> hot_range_item *hr)
> }
> }
>
> +static int hot_rb_remove_hot_inode_item(struct hot_inode_tree *tree,
> + struct hot_inode_item *he)
hot_inode_item_remove()
> +{
> + int ret = 0;
> + rb_erase(&he->rb_node, &tree->map);
> + he->in_tree = 0;
> + return ret;
> +}
> +
> +static int hot_rb_remove_hot_range_item(struct hot_range_tree *tree,
> + struct hot_range_item *hr)
hot_range_item_remove()
(repeat for other function names ;)
> +{
> + int ret = 0;
> + rb_erase(&hr->rb_node, &tree->map);
> + hr->in_tree = 0;
> + return ret;
> +}
these can probably be void functions are they don't use the return
value at all.
> +
> +/* Frees the entire hot_inode_tree. */
> +static void hot_rb_inode_tree_free(struct hot_info *root)
> +{
> + struct rb_node *node, *node2;
> + struct hot_inode_item *he;
> + struct hot_range_item *hr;
> +
> + /* Free hot inode and range trees on fs root */
> + node = rb_first(&root->hot_inode_tree.map);
> +
> + while (node) {
while ((node = rb_first(&root->hot_inode_tree.map))) {
> + he = rb_entry(node, struct hot_inode_item, rb_node);
> +
> + node2 = rb_first(&he->hot_range_tree.map);
> + while (node2) {
while ((node2 = rb_first(&he->hot_range_tree.map))) {
.....
>
> + if (sb->s_hotinfo.mount_opt & HOT_MOUNT_HOT_TRACK)
> + hot_track_exit(sb);
> +
Let the filesystems call in .put_super()
> down_write(&namespace_sem);
> br_write_lock(&vfsmount_lock);
> event++;
> diff --git a/fs/super.c b/fs/super.c
> index 7eb3b0c..0999d5c 100644
> --- a/fs/super.c
> +++ b/fs/super.c
> @@ -1153,6 +1153,9 @@ mount_fs(struct file_system_type *type, int flags,
> const char *name, void *data)
> WARN_ON(sb->s_bdi == &default_backing_dev_info);
> sb->s_flags |= MS_BORN;
>
> + if (hottrack)
> + hot_track_init(sb, name);
And call this in .fill_super() after parsing the hottrack argument.
Cheers,
Dave.
--
Dave Chinner
da...@fromorbit.com
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