Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
Block layer patches:
- file-posix: Handle `EINVAL` fallocate return value
- qemu-img convert -n: Keep qcow2 v2 target sparse
# gpg: Signature made Tue 21 Jul 2020 16:45:28 BST
# gpg: using RSA key DC3DEB159A9AF95D3D7456FE7F09B272C88F2FD6
# gpg: issuer "kwolf@redhat.com"
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74 56FE 7F09 B272 C88F 2FD6
* remotes/kevin/tags/for-upstream:
iotests: Test sparseness for qemu-img convert -n
qcow2: Implement v2 zero writes with discard if possible
file-posix: Handle `EINVAL` fallocate return value
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
diff --git a/block/file-posix.c b/block/file-posix.c
index 8cc39a1..9a00d41 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1698,7 +1698,11 @@
#ifdef CONFIG_FALLOCATE_PUNCH_HOLE
int ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
aiocb->aio_offset, aiocb->aio_nbytes);
- if (ret != -ENOTSUP) {
+ switch (ret) {
+ case -ENOTSUP:
+ case -EINVAL:
+ break;
+ default:
return ret;
}
#endif
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 4b5fc8c..a677ba9 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -1797,8 +1797,15 @@
assert(QEMU_IS_ALIGNED(end_offset, s->cluster_size) ||
end_offset >= bs->total_sectors << BDRV_SECTOR_BITS);
- /* The zero flag is only supported by version 3 and newer */
+ /*
+ * The zero flag is only supported by version 3 and newer. However, if we
+ * have no backing file, we can resort to discard in version 2.
+ */
if (s->qcow_version < 3) {
+ if (!bs->backing) {
+ return qcow2_cluster_discard(bs, offset, bytes,
+ QCOW2_DISCARD_REQUEST, false);
+ }
return -ENOTSUP;
}
diff --git a/tests/qemu-iotests/122 b/tests/qemu-iotests/122
index dfd1cd0..0f3d4ca 100755
--- a/tests/qemu-iotests/122
+++ b/tests/qemu-iotests/122
@@ -282,6 +282,36 @@
$QEMU_IMG compare "$TEST_IMG" "$TEST_IMG".orig
echo
+echo '=== -n to an empty image ==='
+echo
+
+TEST_IMG="$TEST_IMG".orig _make_test_img 64M
+
+# Convert with -n, which should not result in a fully allocated image, not even
+# with compat=0.10 (because the target doesn't have a backing file)
+for compat in "1.1" "0.10"; do
+ IMGOPTS="compat=$compat" _make_test_img 64M
+ $QEMU_IMG convert -O $IMGFMT -n "$TEST_IMG".orig "$TEST_IMG"
+ $QEMU_IMG map --output=json "$TEST_IMG"
+done
+
+echo
+echo '=== -n to an empty image with a backing file ==='
+echo
+
+TEST_IMG="$TEST_IMG".orig _make_test_img 64M
+TEST_IMG="$TEST_IMG".base _make_test_img 64M
+
+# Convert with -n, which should still not result in a fully allocated image for
+# compat=1.1 (because it can use zero clusters), but it should be fully
+# allocated with compat=0.10
+for compat in "1.1" "0.10"; do
+ IMGOPTS="compat=$compat" _make_test_img -b "$TEST_IMG".base -F $IMGFMT 64M
+ $QEMU_IMG convert -O $IMGFMT -n "$TEST_IMG".orig "$TEST_IMG"
+ $QEMU_IMG map --output=json "$TEST_IMG"
+done
+
+echo
echo '=== -n -B to an image without a backing file ==='
echo
diff --git a/tests/qemu-iotests/122.out b/tests/qemu-iotests/122.out
index f1f195e..3a3e121 100644
--- a/tests/qemu-iotests/122.out
+++ b/tests/qemu-iotests/122.out
@@ -229,6 +229,23 @@
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Images are identical.
+=== -n to an empty image ===
+
+Formatting 'TEST_DIR/t.IMGFMT.orig', fmt=IMGFMT size=67108864
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
+[{ "start": 0, "length": 67108864, "depth": 0, "zero": true, "data": false}]
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
+[{ "start": 0, "length": 67108864, "depth": 0, "zero": true, "data": false}]
+
+=== -n to an empty image with a backing file ===
+
+Formatting 'TEST_DIR/t.IMGFMT.orig', fmt=IMGFMT size=67108864
+Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=67108864
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=IMGFMT
+[{ "start": 0, "length": 67108864, "depth": 0, "zero": true, "data": false}]
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=IMGFMT
+[{ "start": 0, "length": 67108864, "depth": 0, "zero": false, "data": true, "offset": 327680}]
+
=== -n -B to an image without a backing file ===
Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=67108864
