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add shared mapped file (in progress)

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implemented:
- Pages can be shared between maps.
- A change made to a map is written to the file, at munmap().

not yet implemented:
- VM operation during page IO execution.
  Because page IO is executed with VM's lock.
- Page IO, which does not change a file size with any case.
  When munmap() races with truncate(), the file size may be changed
  illegally.
This commit is contained in:
NAKAMURA Gou
2013-11-06 17:17:56 +09:00
parent d35140ab0b
commit bbbc6e1570
8 changed files with 153 additions and 24 deletions
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7
kernel/include/memobj.h
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@ -15,12 +15,14 @@ typedef void memobj_release_func_t(struct memobj *obj);
typedef void memobj_ref_func_t(struct memobj *obj);
typedef int memobj_get_page_func_t(struct memobj *obj, off_t off, int p2align, uintptr_t *physp);
typedef uintptr_t memobj_copy_page_func_t(struct memobj *obj, uintptr_t orgphys, int p2align);
typedef int memobj_flush_page_func_t(struct memobj *obj, uintptr_t phys, size_t pgsize);
struct memobj_ops {
memobj_release_func_t * release;
memobj_ref_func_t * ref;
memobj_get_page_func_t * get_page;
memobj_copy_page_func_t * copy_page;
memobj_flush_page_func_t * flush_page;
};
static inline void memobj_release(struct memobj *obj)
@ -45,6 +47,11 @@ static inline uintptr_t memobj_copy_page(struct memobj *obj,
return (*obj->ops->copy_page)(obj, orgphys, p2align);
}
static inline int memobj_flush_page(struct memobj *obj, uintptr_t phys, size_t pgsize)
{
return (*obj->ops->flush_page)(obj, phys, pgsize);
}
static inline void memobj_lock(struct memobj *obj)
{
ihk_mc_spinlock_lock_noirq(&obj->lock);