commit ce897250babe3527f451c1c54c86b62659a2c29e
Author: Maxim Levitsky <mlevitsk@redhat.com>
Date:   Thu Oct 15 17:02:58 2020 +0300

    hacks

diff --git a/block/file-posix.c b/block/file-posix.c
index c63926d592..91ca690505 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1440,6 +1440,12 @@ static ssize_t handle_aiocb_rw_linear(RawPosixAIOData *aiocb, char *buf)
 
     while (offset < aiocb->aio_nbytes) {
         if (aiocb->aio_type & QEMU_AIO_WRITE) {
+
+            long unsigned int size = aiocb->aio_nbytes - offset;
+            long unsigned int off = aiocb->aio_offset + offset;
+
+            printf("       write %012lx %012lx\n", off, off+size-1);
+
             len = pwrite(aiocb->aio_fildes,
                          (const char *)buf + offset,
                          aiocb->aio_nbytes - offset,
@@ -1581,10 +1587,15 @@ static int translate_err(int err)
 static int do_fallocate(int fd, int mode, off_t offset, off_t len)
 {
     do {
+
+        printf("       fallocate %012lx %012lx\n", offset, offset+len-1);
+
         if (fallocate(fd, mode, offset, len) == 0) {
             return 0;
         }
     } while (errno == EINTR);
+
+    printf("FALLOCATE failed with error %d\n", errno);
     return translate_err(-errno);
 }
 #endif
diff --git a/qemu-img.c b/qemu-img.c
index c2c56fc797..64d3b84728 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1803,6 +1803,7 @@ static int convert_iteration_sectors(ImgConvertState *s, int64_t sector_num)
         }
 
         s->sector_next_status = sector_num + n;
+        printf("NEXT_STATUS: %lx\n", s->sector_next_status << 9);
     }
 
     n = MIN(n, s->sector_next_status - sector_num);
@@ -1878,6 +1879,10 @@ static int coroutine_fn convert_co_read(ImgConvertState *s, int64_t sector_num,
     return 0;
 }
 
+static void test_print(const char* op, unsigned long start, unsigned long len)
+{
+    printf("%s: 0x%012lx %012lx (len:0x%lx)\n", op, start, start + len-1, len);
+}
 
 static int coroutine_fn convert_co_write(ImgConvertState *s, int64_t sector_num,
                                          int nb_sectors, uint8_t *buf,
@@ -1911,6 +1916,8 @@ static int coroutine_fn convert_co_write(ImgConvertState *s, int64_t sector_num,
                 (s->compressed &&
                  !buffer_is_zero(buf, n * BDRV_SECTOR_SIZE)))
             {
+                test_print("WRITE", sector_num << BDRV_SECTOR_BITS, n << BDRV_SECTOR_BITS);
+
                 ret = blk_co_pwrite(s->target, sector_num << BDRV_SECTOR_BITS,
                                     n << BDRV_SECTOR_BITS, buf, flags);
                 if (ret < 0) {
@@ -1925,6 +1932,8 @@ static int coroutine_fn convert_co_write(ImgConvertState *s, int64_t sector_num,
                 assert(!s->target_has_backing);
                 break;
             }
+            test_print("ZERO", sector_num << BDRV_SECTOR_BITS, n << BDRV_SECTOR_BITS);
+
             ret = blk_co_pwrite_zeroes(s->target,
                                        sector_num << BDRV_SECTOR_BITS,
                                        n << BDRV_SECTOR_BITS,