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fileobj: implement lookup_page method

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NAKAMURA Gou
2016-03-14 18:35:39 +09:00
parent fbd9dc878b
commit bd7dddd415
1 changed files with 36 additions and 0 deletions
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36
kernel/fileobj.c
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@ -47,6 +47,7 @@ static memobj_get_page_func_t fileobj_get_page;
static memobj_copy_page_func_t fileobj_copy_page;
static memobj_flush_page_func_t fileobj_flush_page;
static memobj_invalidate_page_func_t fileobj_invalidate_page;
static memobj_lookup_page_func_t fileobj_lookup_page;
static struct memobj_ops fileobj_ops = {
.release = &fileobj_release,
@ -55,6 +56,7 @@ static struct memobj_ops fileobj_ops = {
.copy_page = &fileobj_copy_page,
.flush_page = &fileobj_flush_page,
.invalidate_page = &fileobj_invalidate_page,
.lookup_page = &fileobj_lookup_page,
};
static struct fileobj *to_fileobj(struct memobj *memobj)
@ -609,3 +611,37 @@ out:
memobj, phys, pgsize, error);
return error;
}
static int fileobj_lookup_page(struct memobj *memobj, off_t off, int p2align, uintptr_t *physp, unsigned long *pflag)
{
struct fileobj *obj = to_fileobj(memobj);
int error;
uintptr_t phys = -1;
struct page *page;
dkprintf("fileobj_lookup_page(%p,%lx,%x,%p)\n", obj, off, p2align, physp);
memobj_lock(&obj->memobj);
if (p2align != PAGE_P2ALIGN) {
error = -ENOMEM;
goto out;
}
page = page_list_lookup(obj, off);
if (!page) {
error = -ENOENT;
dkprintf("fileobj_lookup_page(%p,%lx,%x,%p): page not found. %d\n", obj, off, p2align, physp, error);
goto out;
}
phys = page_to_phys(page);
error = 0;
if (physp) {
*physp = phys;
}
out:
memobj_unlock(&obj->memobj);
dkprintf("fileobj_lookup_page(%p,%lx,%x,%p): %d %lx\n",
obj, off, p2align, physp, error, phys);
return error;
}