[Libguestfs] [PATCH libnbd 1/2] copy: Add temporary debugging messages

[Nir Soffer]

To help diagnose the abort during sparsify. We probably need to have
similar messages when using --verbose.
---
 copy/multi-thread-copying.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/copy/multi-thread-copying.c b/copy/multi-thread-copying.c
index c36a165..a1f4b19 100644
--- a/copy/multi-thread-copying.c
+++ b/copy/multi-thread-copying.c
@@ -393,12 +393,16 @@ finished_read (void *vp, int *error)
     uint64_t i;
     struct command *newcommand;
 
+    fprintf(stderr, "sparsifying range start=%ld end=%ld len=%ld\n",
+            start, end, end - start);
+
     /* Iterate over whole blocks in the command, starting on a block
      * boundary.
      */
     for (i = ROUND_UP (start, sparse_size);
          i + sparse_size <= end;
          i += sparse_size) {
+
       if (is_zero (slice_ptr (command->slice) + i-start, sparse_size)) {
         /* It's a hole.  If the last was a hole too then we do nothing
          * here which coalesces.  Otherwise write the last data and
@@ -407,6 +411,8 @@ finished_read (void *vp, int *error)
         if (!last_is_hole) {
           /* Write the last data (if any). */
           if (i - last_offset > 0) {
+            fprintf(stderr, "write last data start=%ld end=%ld len=%ld\n",
+                    last_offset, i, i - last_offset);
             newcommand = copy_subcommand (command,
                                           last_offset, i - last_offset,
                                           false);
@@ -429,6 +435,8 @@ finished_read (void *vp, int *error)
         if (last_is_hole) {
           /* Write the last hole (if any). */
           if (i - last_offset > 0) {
+            fprintf(stderr, "write last hole start=%ld end=%ld len=%ld\n",
+                    last_offset, i, i - last_offset);
             newcommand = copy_subcommand (command,
                                           last_offset, i - last_offset,
                                           true);
@@ -444,6 +452,8 @@ finished_read (void *vp, int *error)
     /* Write the last_offset up to i. */
     if (i - last_offset > 0) {
       if (!last_is_hole) {
+        fprintf(stderr, "write last data start=%ld end=%ld len=%ld\n",
+                last_offset, i, i - last_offset);
         newcommand = copy_subcommand (command,
                                       last_offset, i - last_offset,
                                       false);
@@ -454,6 +464,8 @@ finished_read (void *vp, int *error)
                                 });
       }
       else {
+        fprintf(stderr, "write last hole start=%ld end=%ld len=%ld\n",
+                last_offset, i, i - last_offset);
         newcommand = copy_subcommand (command,
                                       last_offset, i - last_offset,
                                       true);
@@ -463,6 +475,8 @@ finished_read (void *vp, int *error)
 
     /* There may be an unaligned tail, so write that. */
     if (end - i > 0) {
+      fprintf(stderr, "write unaligned tail offset=%ld end=%ld len=%ld\n",
+              i, end, end - i);
       newcommand = copy_subcommand (command, i, end - i, false);
       dst->ops->asynch_write (dst, newcommand,
                               (nbd_completion_callback) {
-- 
2.26.2