copy_page_from_iter

Name:copy_page_from_iter

Proto:size_t copy_page_from_iter(struct page *page, size_t offset, size_t bytes, struct iov_iter *i)

Type:size_t

Parameter:

Type	Parameter	Name
struct page *	page
size_t	offset
size_t	bytes
struct iov_iter *	i

929

If Value for the false possibility is greater at compile time(!page_copy_sane(page, offset, bytes)) Then Return 0

931

If Value for the false possibility is greater at compile time(iov_iter_is_pipe(i) || iov_iter_is_discard(i)) Then

932

933

Return 0

935

If * Bit 0 is the read/write bit, set if we're writing. * Bit 1 is the BVEC_FLAG_NO_REF bit, set if type is a bvec and * the caller isn't expecting to drop a page reference when done. & (ITER_BVEC | ITER_KVEC) Then

936

kaddr = kmap_atomic(page)

937

wanted = _copy_from_iter(kaddr + offset, bytes, i)

938

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.(kaddr)

939

Return wanted

940

Else Return copy_page_from_iter_iovec(page, offset, bytes, i)

**Caller**
Name	Describe
pipe_write

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