diff --git a/du_io_uring.cpp b/du_io_uring.cpp
index 4684f86..523b1df 100644
--- a/du_io_uring.cpp
+++ b/du_io_uring.cpp
@@ -13,10 +13,21 @@
 #include <liburing.h>
 
 #include <deque>
-
-#define BUF_SIZE 16384*2
-
-std::deque<int> queue;
+#include <string>
+#include <memory>
+
+#define BUF_SIZE 16384
+
+struct file{
+    enum class State {OPEN, STAT};
+    int parent_fd;
+    int fd = -1;
+    int ret;
+    std::string name;
+    State state;
+    struct statx stat;
+};
+std::deque<file*> queue;
 
 static size_t size;
 static struct io_uring ring;
@@ -29,9 +40,9 @@ static void drain_cqes()
 
     int count = 0;
     io_uring_for_each_cqe (&ring, head, cqe) {
-        //TODO: handle error open file because of limit of open file descriptors
-        if(cqe->res>0)
-            queue.push_back(cqe->res);
+        file* f = (file*)io_uring_cqe_get_data(cqe);
+        f->ret=cqe->res;
+        queue.push_back(f);
         count++;
     }
 
@@ -64,32 +75,19 @@ static struct io_uring_sqe *get_sqe()
     return sqe;
 }
 
-static void schedule_open(int parent_fd, const char* name)
+static void schedule_open(file* f)
 {
+    f->state=file::State::OPEN;
     struct io_uring_sqe* sqe = get_sqe();
-    io_uring_prep_openat(sqe, parent_fd, name, O_NOFOLLOW | O_NONBLOCK, O_RDONLY);
+    io_uring_prep_openat(sqe, f->parent_fd, f->name.c_str(), O_NOFOLLOW | O_NONBLOCK, O_RDONLY);
+    io_uring_sqe_set_data(sqe, f);
 }
-struct statx stat_buf[BUF_SIZE];
-static void schedule_statx(int parent_fd, const char* name)
+static void schedule_statx(file* f)
 {
+    f->state=file::State::STAT;
     struct io_uring_sqe* sqe = get_sqe();
-    io_uring_prep_statx(sqe, parent_fd, name, AT_SYMLINK_NOFOLLOW,STATX_MODE | STATX_BLOCKS, &stat_buf[sqes_in_flight-1]);
-}
-static void parse_file(int dirfd, const char* name){
-    struct statx statbuf;
-    //printf("fd:%d\n",fd);
-    //TODO: use AT_EMPTY_PATH on statx
-    if (statx(dirfd, name, AT_SYMLINK_NOFOLLOW,STATX_MODE | STATX_BLOCKS, &statbuf) != 0){
-        printf("error statx %s\n",name);
-        return;
-    }
-    if(S_ISDIR(statbuf.stx_mode)){
-        size += statbuf.stx_blocks*512;
-        schedule_open(dirfd,name);
-    }
-    else if(S_ISREG(statbuf.stx_mode))
-        size += statbuf.stx_blocks*512;
-    return;
+    io_uring_prep_statx(sqe, f->parent_fd, f->name.c_str(), AT_SYMLINK_NOFOLLOW,STATX_MODE | STATX_BLOCKS, &f->stat);
+    io_uring_sqe_set_data(sqe, f);
 }
 
 static char buff[BUF_SIZE];
@@ -98,6 +96,7 @@ static void parse_directory(int fd){
         int nread = syscall(SYS_getdents64, fd, buff, BUF_SIZE);
         if (nread == -1){
             perror("getdents");
+            fprintf(stderr, "(%d): %s\n",fd, strerror(errno));
             break;
         }
 
@@ -111,56 +110,17 @@ static void parse_directory(int fd){
                 continue;
             if(strcmp(d->d_name,"..")==0)
                 continue;
-            schedule_statx(fd,d->d_name);
-        }
-        while (sqes_in_flight) {
-            int ret = io_uring_submit_and_wait(&ring, sqes_in_flight);
-            if (ret < 0 && errno != EBUSY) {
-                perror("io_uring_submit_and_wait");
-                exit(EXIT_FAILURE);
-            }
-
-            uint32_t head;
-            struct io_uring_cqe *cqe;
-
-            int count = 0;
-            io_uring_for_each_cqe (&ring, head, cqe) {
-                count++;
-            }
-            sqes_in_flight -= count;
-            io_uring_cq_advance(&ring, count);
-        }
-        int count=0;
-        for(int i=0;i<nread;){
-            struct dirent* d = (struct dirent *)(buff+i);
-            i+=d->d_reclen;
-            if(strcmp(d->d_name,".")==0)
-                continue;
-            if(strcmp(d->d_name,"..")==0)
-                continue;
-            if(S_ISDIR(stat_buf[count].stx_mode)){
-                size += stat_buf[count].stx_blocks*512;
-                schedule_open(fd,d->d_name);
-            }
-            else if(S_ISREG(stat_buf[count].stx_mode))
-                size += stat_buf[count].stx_blocks*512;
-            count++;
-        }
-        while (sqes_in_flight) {
-            int ret = io_uring_submit_and_wait(&ring, sqes_in_flight);
-            if (ret < 0 && errno != EBUSY) {
-                perror("io_uring_submit_and_wait");
-                exit(EXIT_FAILURE);
-            }
-
-            drain_cqes();
+            file* f = new file;
+            f->parent_fd=fd;
+            f->name=d->d_name;
+            schedule_statx(f);
         }
     }
 }
 
 static void submit_wait_until_complete(){
     while (sqes_in_flight) {
-        int ret = io_uring_submit_and_wait(&ring, sqes_in_flight);
+        int ret = io_uring_submit_and_wait(&ring, 1);
         if (ret < 0 && errno != EBUSY) {
             perror("io_uring_submit_and_wait");
             exit(EXIT_FAILURE);
@@ -168,8 +128,26 @@ static void submit_wait_until_complete(){
 
         drain_cqes();
         while(!queue.empty()){
-            parse_directory(queue.front());
+            file* f = queue.front();
             queue.pop_front();
+            if(f->state==file::State::STAT){
+                if(f->ret==0){
+                    if(S_ISDIR(f->stat.stx_mode)){
+                        size += f->stat.stx_blocks*512;
+                        schedule_open(f);
+                    }
+                    else if(S_ISREG(f->stat.stx_mode))
+                        size += f->stat.stx_blocks*512;
+                }
+            }else{
+                if(f->ret<0){
+                    fprintf(stderr, "error opening ");
+                    fprintf(stderr, ": %s\n", strerror(-ret));
+                    continue;
+                }
+                f->fd=f->ret;
+                parse_directory(f->fd);
+            }
         }
     }
 }
@@ -216,9 +194,11 @@ int main(int argc, char** argv){
     for(int i=1;i<argc;i++){
         size=0;
         char* filename=argv[i];
-        size_t len = strlen(filename);
 
-        parse_file(AT_FDCWD, filename);
+        file* f = new file;
+        f->parent_fd=AT_FDCWD;
+        f->name=filename;
+        schedule_statx(f);
 
         submit_wait_until_complete();
         printf("%s\t%s\n",humanSize(size), filename);