find_alloced_obj

Name:Find alloced object in zspage from index object and* return handle.

Proto:static unsigned long find_alloced_obj(struct size_class *class, struct page *page, int *obj_idx)

Type:unsigned long

Parameter:

Type	Parameter	Name
struct size_class *	class
struct page *	page
int *	obj_idx

1656

offset = 0

1657

index = obj_idx

1658

handle = 0

1659

addr = kmap_atomic(page)

1661

offset = get_first_obj_offset(page)

1662

offset += * Size of objects stored in this class. Must be multiple * of ZS_ALIGN. * index

1664

When offset < PAGE_SIZE cycle

1665

head = obj_to_head(page, addr + offset)

1666

If head & Head in allocated object should have OBJ_ALLOCATED_TAG* to identify the object was allocated or not.* It's okay to add the status bit in the least bit because* header keeps handle which is 4byte-aligned address so we* have room for two bit at least. Then

1667

handle = head & ~Head in allocated object should have OBJ_ALLOCATED_TAG* to identify the object was allocated or not.* It's okay to add the status bit in the least bit because* header keeps handle which is 4byte-aligned address so we* have room for two bit at least.

1668

If trypin_tag(handle) Then Break

1670

handle = 0

1673

offset += * Size of objects stored in this class. Must be multiple * of ZS_ALIGN.

1674

index++

1677

Prevent people trying to call kunmap_atomic() as if it were kunmap()* kunmap_atomic() should get the return value of kmap_atomic, not the page.(addr)

1679

obj_idx = index

1681

Return handle

**Caller**
Name	Describe
migrate_zspage

Source code conversion tool public plug-in interface	X
Support c/c++/esqlc/java Oracle/Informix/Mysql Plug-in can realize: logical Report Code generation and batch code conversion