qemu-iotests: Use zero-based offsets for IO patterns

The io_pattern style functions have the following loop:

  for i in `seq 1 $count`; do
      echo ... $(( start + i * step )) ...
  done

Offsets are 1-based so start=1024, step=512, count=4 yields:
1536, 2048, 2560, 3072

Normally we expect:
1024, 1536, 2048, 2560

Most tests ignore this detail, which means that they perform I/O to a
slightly different range than expected by the test author.

Later on things got less innocent and tests started trying to compensate
for the 1-based indexing.  This included negative start values in test
024 and my own attempt with count-1 in test 028!

The end result is that tests that use io_pattern are hard to reason
about and don't work the way you'd expect.  It's time to clean this mess
up.

This patch switches io_pattern to 0-based offsets.  This requires
adjusting the golden outputs since I/O ranges are now shifted and output
differs.

Verifying these output diffs is easy, however.  Each diff hunk moves one
I/O from beyond the end of the pattern range to the beginning.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 26 insertions, 26 deletions

diff --git a/tests/qemu-iotests/020.out b/tests/qemu-iotests/020.out
index f128b21d1d..9b8fd43edc 100644
--- a/tests/qemu-iotests/020.out
+++ b/tests/qemu-iotests/020.out
@@ -3,6 +3,8 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=6442450944
 Filling base image
 
 === IO: pattern 0
+qemu-io> wrote 512/512 bytes at offset 0
+512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> wrote 512/512 bytes at offset 1024
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> wrote 512/512 bytes at offset 2048
@@ -129,12 +131,12 @@ qemu-io> wrote 512/512 bytes at offset 63488
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> wrote 512/512 bytes at offset 64512
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-qemu-io> wrote 512/512 bytes at offset 65536
-512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> === IO: pattern 128
-qemu-io> wrote 65536/65536 bytes at offset 131072
+qemu-io> wrote 65536/65536 bytes at offset 65536
 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> === IO: pattern 0
+qemu-io> wrote 512/512 bytes at offset 4294967296
+512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> wrote 512/512 bytes at offset 4294968320
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> wrote 512/512 bytes at offset 4294969344
@@ -261,10 +263,8 @@ qemu-io> wrote 512/512 bytes at offset 4295030784
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> wrote 512/512 bytes at offset 4295031808
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-qemu-io> wrote 512/512 bytes at offset 4295032832
-512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> === IO: pattern 128
-qemu-io> wrote 65536/65536 bytes at offset 4295098368
+qemu-io> wrote 65536/65536 bytes at offset 4295032832
 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> No errors were found on the image.
 Creating test image with backing file
@@ -273,6 +273,8 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=6442450944 backing_file='TEST_DI
 Filling test image
 
 === IO: pattern 1
+qemu-io> wrote 512/512 bytes at offset 512
+512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> wrote 512/512 bytes at offset 1536
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> wrote 512/512 bytes at offset 2560
@@ -399,12 +401,12 @@ qemu-io> wrote 512/512 bytes at offset 64000
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> wrote 512/512 bytes at offset 65024
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-qemu-io> wrote 512/512 bytes at offset 66048
-512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> === IO: pattern 0
-qemu-io> wrote 65536/65536 bytes at offset 196608
+qemu-io> wrote 65536/65536 bytes at offset 131072
 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> === IO: pattern 1
+qemu-io> wrote 512/512 bytes at offset 4294967808
+512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> wrote 512/512 bytes at offset 4294968832
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> wrote 512/512 bytes at offset 4294969856
@@ -531,16 +533,16 @@ qemu-io> wrote 512/512 bytes at offset 4295031296
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> wrote 512/512 bytes at offset 4295032320
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-qemu-io> wrote 512/512 bytes at offset 4295033344
-512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> === IO: pattern 0
-qemu-io> wrote 65536/65536 bytes at offset 4295163904
+qemu-io> wrote 65536/65536 bytes at offset 4295098368
 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> No errors were found on the image.
 Image committed.
 Reading from the backing file
 
 === IO: pattern 0
+qemu-io> read 512/512 bytes at offset 0
+512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> read 512/512 bytes at offset 1024
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> read 512/512 bytes at offset 2048
@@ -667,9 +669,9 @@ qemu-io> read 512/512 bytes at offset 63488
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> read 512/512 bytes at offset 64512
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-qemu-io> read 512/512 bytes at offset 65536
-512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> === IO: pattern 1
+qemu-io> read 512/512 bytes at offset 512
+512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> read 512/512 bytes at offset 1536
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> read 512/512 bytes at offset 2560
@@ -796,18 +798,18 @@ qemu-io> read 512/512 bytes at offset 64000
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> read 512/512 bytes at offset 65024
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-qemu-io> read 512/512 bytes at offset 66048
-512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> === IO: pattern 128
-qemu-io> read 65536/65536 bytes at offset 131072
+qemu-io> read 65536/65536 bytes at offset 65536
 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> === IO: pattern 0
-qemu-io> read 65536/65536 bytes at offset 196608
+qemu-io> read 65536/65536 bytes at offset 131072
 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> === IO: pattern 0
-qemu-io> read 65536/65536 bytes at offset 393216
+qemu-io> read 65536/65536 bytes at offset 327680
 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> === IO: pattern 0
+qemu-io> read 512/512 bytes at offset 4294967296
+512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> read 512/512 bytes at offset 4294968320
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> read 512/512 bytes at offset 4294969344
@@ -934,9 +936,9 @@ qemu-io> read 512/512 bytes at offset 4295030784
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> read 512/512 bytes at offset 4295031808
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-qemu-io> read 512/512 bytes at offset 4295032832
-512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> === IO: pattern 1
+qemu-io> read 512/512 bytes at offset 4294967808
+512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> read 512/512 bytes at offset 4294968832
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> read 512/512 bytes at offset 4294969856
@@ -1063,16 +1065,14 @@ qemu-io> read 512/512 bytes at offset 4295031296
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> read 512/512 bytes at offset 4295032320
 512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-qemu-io> read 512/512 bytes at offset 4295033344
-512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> === IO: pattern 128
-qemu-io> read 65536/65536 bytes at offset 4295098368
+qemu-io> read 65536/65536 bytes at offset 4295032832
 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> === IO: pattern 0
-qemu-io> read 65536/65536 bytes at offset 4295163904
+qemu-io> read 65536/65536 bytes at offset 4295098368
 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> === IO: pattern 0
-qemu-io> read 65536/65536 bytes at offset 4295360512
+qemu-io> read 65536/65536 bytes at offset 4295294976
 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> No errors were found on the image.
 *** done