vfs_writev       1002 fs/nfsd/vfs.c  	host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
vfs_writev        671 fs/read_write.c 		ret = vfs_writev(file, vec, vlen, &pos);
vfs_writev       1365 include/linux/fs.h extern ssize_t vfs_writev(struct file *, const struct iovec __user *,