函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:lib\iov_iter.c Create Date:2022-07-27 07:20:40
Last Modify:2022-05-21 11:43:54 Copyright©Brick
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函数名称：csum_and_copy_from_iter

函数原型：size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i)

返回类型：size_t

参数：

类型参数名称
void *addr
size_tbytes
__wsum *csum
struct iov_iter *i
1441  to等于addr
1443  off等于0
1444  sum等于csum
1445  如果此条件成立可能性小(为编译器优化)(iov_iter_is_pipe(i) || iov_iter_is_discard(i))则
1446  WARN_ON(1)
1447  返回:0
1449  iterate_and_advance(i, bytes, v, ({interr = 0;next = csum_and_copy_from_user(iov_base, (to += iov_len) - iov_len, iov_len, 0, & err);如果非err则{sum = csum_block_add(sum, next, off);off += iov_len;}err ? iov_len : 0;}), ({char * p = kmap_atomic(bv_page);sum = csum_and_memcpy((to += bv_len) - bv_len, p + bv_offset, bv_len, sum, off);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.(p);off += bv_len;}), ({sum = csum_and_memcpy((to += iov_len) - iov_len, iov_base, iov_len, sum, off);off += iov_len;}))
1473  csum等于sum
1474  返回:bytes