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support msync() system call. refs #382

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Msync(2) of this version writes only the pages which the calling process
modified. Modifications of the other processes are not written.
This commit is contained in:
NAKAMURA Gou
2014-07-09 14:19:26 +09:00
parent 6485578a7f
commit 16af976a71
8 changed files with 356 additions and 0 deletions
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32
kernel/fileobj.c
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@@ -46,6 +46,7 @@ static memobj_ref_func_t fileobj_ref;
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 struct memobj_ops fileobj_ops = {
.release = &fileobj_release,
@@ -53,6 +54,7 @@ static struct memobj_ops fileobj_ops = {
.get_page = &fileobj_get_page,
.copy_page = &fileobj_copy_page,
.flush_page = &fileobj_flush_page,
.invalidate_page = &fileobj_invalidate_page,
};
static struct fileobj *to_fileobj(struct memobj *memobj)
@@ -577,3 +579,33 @@ static int fileobj_flush_page(struct memobj *memobj, uintptr_t phys,
memobj_lock(&obj->memobj);
return 0;
}
static int fileobj_invalidate_page(struct memobj *memobj, uintptr_t phys,
size_t pgsize)
{
struct fileobj *obj = to_fileobj(memobj);
int error;
struct page *page;
dkprintf("fileobj_invalidate_page(%p,%#lx,%#lx)\n",
memobj, phys, pgsize);
if (!(page = phys_to_page(phys))
|| !(page = page_list_lookup(obj, page->offset))) {
error = 0;
goto out;
}
if (ihk_atomic_read(&page->count) == 1) {
if (page_unmap(page)) {
ihk_mc_free_pages(phys_to_virt(phys),
pgsize/PAGE_SIZE);
}
}
error = 0;
out:
dkprintf("fileobj_invalidate_page(%p,%#lx,%#lx):%d\n",
memobj, phys, pgsize, error);
return error;
}