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SubjectRe: [PATCH 12/15] mm, dax: enable filesystems to trigger page-idle callbacks
> +DEFINE_MUTEX(devmap_lock);

static?

> +#if IS_ENABLED(CONFIG_FS_DAX)
> +static void generic_dax_pagefree(struct page *page, void *data)
> +{
> +}
> +
> +struct dax_device *fs_dax_claim_bdev(struct block_device *bdev, void *owner)
> +{
> + struct dax_device *dax_dev;
> + struct dev_pagemap *pgmap;
> +
> + if (!blk_queue_dax(bdev->bd_queue))
> + return NULL;
> + dax_dev = fs_dax_get_by_host(bdev->bd_disk->disk_name);
> + if (!dax_dev->pgmap)
> + return dax_dev;
> + pgmap = dax_dev->pgmap;

> + mutex_lock(&devmap_lock);
> + if ((pgmap->data && pgmap->data != owner) || pgmap->page_free
> + || pgmap->page_fault
> + || pgmap->type != MEMORY_DEVICE_HOST) {
> + put_dax(dax_dev);
> + mutex_unlock(&devmap_lock);
> + return NULL;
> + }
> +
> + pgmap->type = MEMORY_DEVICE_FS_DAX;
> + pgmap->page_free = generic_dax_pagefree;
> + pgmap->data = owner;
> + mutex_unlock(&devmap_lock);

All this deep magic will need some explanation. So far I don't understand
it at all, but maybe the later patches will help..

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