void iov_iter_init(struct iov_iter *i, unsigned int direction, const struct iovec *iov,unsigned long nr_segs, size_t count); 然后与用户空间移动数据: size_t _copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i); size_t _copy_from_iter(void *addr, size_t bytes, str...
iov_iter本质是一个iovec的迭代器，与用户空间的iovec结构相同，并与系统调用如readv()协同工作。iovec数组形式体现了其“vec”特征，用于处理多个数据块。iov_iter的属性与用法 iovec结构包括type、iov_offset、count等字段。type描述迭代器的操作类型，是read或write的位掩码；iov_offset表示数组中的位置；...
1. struct iov_iter *i:表示源迭代器,用于指定数据的源位置。它包含了指向数据缓冲区的指针iov和缓冲区的长度count。 2. unsigned int op:表示操作类型,可以是READ或WRITE。当op为READ时,iov_iter_rw函数将会从源迭代器i中读取数据;当op为WRITE时,iov_iter_rw函数将会向目标迭代器to中写入数据。 3. struct...
iov_kunit_load_bvec(test,&iter,READ,bvec,ARRAY_SIZE(bvec), bpages,npages,bufsize,bvec_test_ranges); size=iter.count; pr=bvec_test_ranges; from=pr->from; do{ size_toffset0=LONG_MAX; for(i=0;i<ARRAY_SIZE(pagelist);i++) pagelist[i]=(void*)(unsigned long)0xaa55aa55aa55aa55ULL...
return copy_mc_to_kernel(to + progress, iter_from, len); } static size_t __copy_from_iter_mc(void *addr, size_t bytes, struct iov_iter *i) { if (unlikely(i->count < bytes)) bytes = i->count; if (unlikely(!bytes)) return 0; return iterate_bvec(i, bytes, addr, NULL, me...
1.iov_iter的定义 iov_iter结构体通常定义为: c复制代码 struct iov_iter { int type; /* Type of iter */ size_t pos; /* Offset to current iter */ size_t count; /* Count of bytes not yet iterated */ size_t nbytes; /* Total number of bytes in the iter */ union { struct { vo...
+ * int do_foo(struct iov_iter *i) + * { + * size_t usize = iov_iter_single_seg_count(i); + * struct foo karg; + * int err; + * + * if (usize > PAGE_SIZE) + * return -E2BIG; + * if (usize < FOO_SIZE_VER0) ...
1314 如果maxsize大于count则maxsize等于count 1317 如果此条件成立可能性小(为编译器优化)(iov_iter_is_pipe(i))则返回:pipe_get_pages(i, pages, maxsize, maxpages, start) 1319 如果此条件成立可能性小(为编译器优化)(iov_iter_is_discard(i))则返回:负EFAULT 1322 iterate_all_kinds(i, maxsize, v...
len){len=MAX_RW_COUNT-total_len;iov[seg].iov_len=len;}total_len+=len;}iov_iter_init(i,...
LU-17386 BUG: KASAN: stack-out-of-bounds in iov_iter_advance LU-17777runtests test_1: FAIL: old and new files are different: rc=22 LU-18429failover node nid switches to loopback 0@lo on imports LU-18052osc checksums caused an client evictions during recovery LU-18147client page cache...