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#include 

#include 

#include "i915_drv.h"

#include "intel_drv.h"

struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags)

{

    struct file *filep;

    int count;

    filep = malloc(sizeof(*filep));

    if(unlikely(filep == NULL))

        return ERR_PTR(-ENOMEM);

    count = size / PAGE_SIZE;

    filep->pages = kzalloc(sizeof(struct page *) * count, 0);

    if(unlikely(filep->pages == NULL))

    {

        kfree(filep);

        return ERR_PTR(-ENOMEM);

    };

    filep->count     = count;

    filep->allocated = 0;

    filep->vma       = NULL;

//    dbgprintf("%s file %p pages %p count %d\n",

//              __FUNCTION__,filep, filep->pages, filep->pages);

    return filep;

}

struct page *shmem_read_mapping_page_gfp(struct file *filep,

                                         pgoff_t index, gfp_t gfp)

{

    struct page *page;

//    dbgprintf("%s, file %p index %d\n", __FUNCTION__, filep, index);

    if(unlikely(index >= filep->count))

        return ERR_PTR(-EINVAL);

    page = filep->pages[index];

    if(unlikely(page == NULL))

    {

        page = (struct page *)AllocPage();

        if(unlikely(page == NULL))

            return ERR_PTR(-ENOMEM);

        filep->pages[index] = page;

    };

    return page;

};