先初始化iov_iter: 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,...
在进行I/O操作前,通常需要初始化iov_iter。这可以通过调用init_iov_iter或类似的函数来完成。 在使用完iov_iter后,最好调用相关的清理函数,如clear_iov_iter,以释放相关资源。 5.例子 假设我们要将一个缓冲区中的数据写入到文件中,可以使用writev函数和iov_iter来完成: c复制代码 #include <stdio.h> #include...
@@ -166,7 +166,6 @@ void iov_iter_init(struct iov_iter *i, unsigned int direction, WARN_ON(direction & ~(READ | WRITE)); *i = (struct iov_iter) { .iter_type = ITER_IOVEC, .copy_mc = false, .nofault = false, .data_source = direction, .__iov = iov, @@ -244,27 +...
for (p = iter_iov(i), skip = i->iov_offset; count; p++, skip = 0) { size_t len = min(count, p->iov_len - skip); size_t ret; @@ -425,7 +425,7 @@ void iov_iter_init(struct iov_iter *i, unsigned int direction, .nofault = false, .user_backed = true, .data_sour...
This gets rid of a usually needless call to iov_iter_advance(). Signed-off-by: Kent Overstreet <k...@daterainc.com> Cc: Alexander Viro <v...@zeniv.linux.org.uk> Cc: Jens Axboe <ax...@kernel.dk> Cc: Chris Mason <c...@fb.com> ...
len){len=MAX_RW_COUNT-total_len;iov[seg].iov_len=len;}total_len+=len;}iov_iter_init(i,...
len){len=MAX_RW_COUNT-total_len;iov[seg].iov_len=len;}total_len+=len;}iov_iter_init(i,...
EXPORT_SYMBOL(iov_iter_init); staticvoidmemzero_page(structpage*page,size_toffset,size_tlen) { char*addr=kmap_atomic(page); memset(addr+offset,0,len); kunmap_atomic(addr); } staticinlineboolallocated(structpipe_buffer*buf) { returnbuf->ops==&default_pipe_buf_ops; ...
KUNIT_EXPECT_EQ(test,iter.count,0); KUNIT_SUCCEED(); } /* * Test the extraction of ITER_BVEC-type iterators. */ staticvoid__initiov_kunit_extract_pages_bvec(structkunit*test) { conststructbvec_test_range*pr; structiov_iteriter;
Development version of the Upstream MultiPath TCP Linux kernel 🐧 - mptcp_net-next/include/linux/iov_iter.h at 807404d66fcf898d4bcc6a3e3edb07ffd5b88400 · multipath-tcp/mptcp_net-next