src/kernel/arch/amd64/driver/util.c


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#include <camellia/fsutil.h>
#include <kernel/arch/amd64/driver/util.h>
#include <kernel/mem/virt.h>
#include <kernel/panic.h>
#include <kernel/vfs/request.h>

int req_readcopy(struct vfs_request *req, const void *buf, size_t len) {
	if (!req->caller) return -1;
	assert(req->type == VFSOP_READ);
	fs_normslice(&req->offset, &req->output.len, len, false);
	virt_cpy_to(
			req->caller->pages, req->output.buf,
			buf + req->offset, req->output.len);
	/* read errors are ignored. TODO write a spec */
	return req->output.len;
}