[Libguestfs] [PATCH nbdkit] log: Decode the extent type in output.

[Richard W.M. Jones]

Instead of printing something like ‘type=0’ or ‘type=3’, this changes
the output to show the hole and zero flags separately.  For example:

  $ ./nbdkit -U - --filter=log sh - logfile=/dev/stdout \
      --run 'qemu-img map $nbd' <<'EOF'
  case "$1" in
     get_size) echo 1M ;;
     pread) dd if=/dev/zero count=$3 iflag=count_bytes ;;
     can_extents) exit 0 ;;
     extents)
         echo "0   32K    zero"
         echo "32K 32K    hole,zero"
         echo "64K 983040 "
         ;;
     *) exit 2 ;;
  esac
  EOF
  [...]
  2019-04-01 11:49:40.818357 connection=1 Extents id=2 offset=0x0 count=0x100000 req_one=1 ...
  2019-04-01 11:49:40.819848 connection=1 ...Extents id=2 extents=[{ offset=0x0, length=0x8000, hole=0, zero=1 }, { offset=0x8000, length=0x8000, hole=1, zero=1 }, { offset=0x10000, length=0xf0000, hole=0, zero=0 }] return=0

Updates commit ed868b00f192cd72e91265e4fcdf3c3fbe8b7613.

Thanks: Martin Kletzander
---
 filters/log/log.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/filters/log/log.c b/filters/log/log.c
index 4878db2..02a2522 100644
--- a/filters/log/log.c
+++ b/filters/log/log.c
@@ -382,8 +382,10 @@ log_extents (struct nbdkit_next_ops *next_ops, void *nxdata,
         if (i > 0)
           fprintf (fp, ", ");
         fprintf (fp, "{ offset=0x%" PRIx64 ", length=0x%" PRIx64 ", "
-                 "type=%" PRIu32 " }",
-                 e.offset, e.length, e.type);
+                 "hole=%d, zero=%d }",
+                 e.offset, e.length,
+                 !!(e.type & NBDKIT_EXTENT_HOLE),
+                 !!(e.type & NBDKIT_EXTENT_ZERO));
       }
 
       fclose (fp);
-- 
2.20.1