Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer patches:

- Block graph change fixes (avoid loops, cope with non-tree graphs)
- bdrv_set_aio_context() related fixes
- HMP snapshot commands: Use only tag, not the ID to identify snapshots
- qmeu-img, commit: Error path fixes
- block/nvme: Build fix for gcc 9
- MAINTAINERS updates
- Fix various issues with bdrv_refresh_filename()
- Fix various iotests
- Include LUKS overhead in qemu-img measure for qcow2
- A fix for vmdk's image creation interface

# gpg: Signature made Mon 25 Feb 2019 14:18:15 GMT
# gpg:                using RSA key 7F09B272C88F2FD6
# 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: (71 commits)
  iotests: Skip 211 on insufficient memory
  vmdk: false positive of compat6 with hwversion not set
  iotests: add LUKS payload overhead to 178 qemu-img measure test
  qcow2: include LUKS payload overhead in qemu-img measure
  iotests.py: s/_/-/g on keys in qmp_log()
  iotests: Let 045 be run concurrently
  iotests: Filter SSH paths
  iotests.py: Filter filename in any string value
  iotests.py: Add is_str()
  iotests: Fix 207 to use QMP filters for qmp_log
  iotests: Fix 232 for LUKS
  iotests: Remove superfluous rm from 232
  iotests: Fix 237 for Python 2.x
  iotests: Re-add filename filters
  iotests: Test json:{} filenames of internal BDSs
  block: BDS options may lack the "driver" option
  block/null: Generate filename even with latency-ns
  block/curl: Implement bdrv_refresh_filename()
  block/curl: Harmonize option defaults
  block/nvme: Fix bdrv_refresh_filename()
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 85 insertions, 4 deletions

diff --git a/block/qcow2.c b/block/qcow2.c
index b6d475229e..7fb2730f09 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1474,13 +1474,15 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options,
             goto fail;
         }
         ret = bdrv_pread(bs->file, header.backing_file_offset,
-                         bs->backing_file, len);
+                         bs->auto_backing_file, len);
         if (ret < 0) {
             error_setg_errno(errp, -ret, "Could not read backing file name");
             goto fail;
         }
-        bs->backing_file[len] = '\0';
-        s->image_backing_file = g_strdup(bs->backing_file);
+        bs->auto_backing_file[len] = '\0';
+        pstrcpy(bs->backing_file, sizeof(bs->backing_file),
+                bs->auto_backing_file);
+        s->image_backing_file = g_strdup(bs->auto_backing_file);
     }
 
     /* Internal snapshots */
@@ -2518,6 +2520,8 @@ static int qcow2_change_backing_file(BlockDriverState *bs,
         return -EINVAL;
     }
 
+    pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file),
+            backing_file ?: "");
     pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: "");
     pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: "");
 
@@ -4224,6 +4228,60 @@ static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs)
     return ret;
 }
 
+static ssize_t qcow2_measure_crypto_hdr_init_func(QCryptoBlock *block,
+        size_t headerlen, void *opaque, Error **errp)
+{
+    size_t *headerlenp = opaque;
+
+    /* Stash away the payload size */
+    *headerlenp = headerlen;
+    return 0;
+}
+
+static ssize_t qcow2_measure_crypto_hdr_write_func(QCryptoBlock *block,
+        size_t offset, const uint8_t *buf, size_t buflen,
+        void *opaque, Error **errp)
+{
+    /* Discard the bytes, we're not actually writing to an image */
+    return buflen;
+}
+
+/* Determine the number of bytes for the LUKS payload */
+static bool qcow2_measure_luks_headerlen(QemuOpts *opts, size_t *len,
+                                         Error **errp)
+{
+    QDict *opts_qdict;
+    QDict *cryptoopts_qdict;
+    QCryptoBlockCreateOptions *cryptoopts;
+    QCryptoBlock *crypto;
+
+    /* Extract "encrypt." options into a qdict */
+    opts_qdict = qemu_opts_to_qdict(opts, NULL);
+    qdict_extract_subqdict(opts_qdict, &cryptoopts_qdict, "encrypt.");
+    qobject_unref(opts_qdict);
+
+    /* Build QCryptoBlockCreateOptions object from qdict */
+    qdict_put_str(cryptoopts_qdict, "format", "luks");
+    cryptoopts = block_crypto_create_opts_init(cryptoopts_qdict, errp);
+    qobject_unref(cryptoopts_qdict);
+    if (!cryptoopts) {
+        return false;
+    }
+
+    /* Fake LUKS creation in order to determine the payload size */
+    crypto = qcrypto_block_create(cryptoopts, "encrypt.",
+                                  qcow2_measure_crypto_hdr_init_func,
+                                  qcow2_measure_crypto_hdr_write_func,
+                                  len, errp);
+    qapi_free_QCryptoBlockCreateOptions(cryptoopts);
+    if (!crypto) {
+        return false;
+    }
+
+    qcrypto_block_free(crypto);
+    return true;
+}
+
 static BlockMeasureInfo *qcow2_measure(QemuOpts *opts, BlockDriverState *in_bs,
                                        Error **errp)
 {
@@ -4233,11 +4291,13 @@ static BlockMeasureInfo *qcow2_measure(QemuOpts *opts, BlockDriverState *in_bs,
     uint64_t virtual_size; /* disk size as seen by guest */
     uint64_t refcount_bits;
     uint64_t l2_tables;
+    uint64_t luks_payload_size = 0;
     size_t cluster_size;
     int version;
     char *optstr;
     PreallocMode prealloc;
     bool has_backing_file;
+    bool has_luks;
 
     /* Parse image creation options */
     cluster_size = qcow2_opt_get_cluster_size_del(opts, &local_err);
@@ -4267,6 +4327,20 @@ static BlockMeasureInfo *qcow2_measure(QemuOpts *opts, BlockDriverState *in_bs,
     has_backing_file = !!optstr;
     g_free(optstr);
 
+    optstr = qemu_opt_get_del(opts, BLOCK_OPT_ENCRYPT_FORMAT);
+    has_luks = optstr && strcmp(optstr, "luks") == 0;
+    g_free(optstr);
+
+    if (has_luks) {
+        size_t headerlen;
+
+        if (!qcow2_measure_luks_headerlen(opts, &headerlen, &local_err)) {
+            goto err;
+        }
+
+        luks_payload_size = ROUND_UP(headerlen, cluster_size);
+    }
+
     virtual_size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0);
     virtual_size = ROUND_UP(virtual_size, cluster_size);
 
@@ -4337,7 +4411,7 @@ static BlockMeasureInfo *qcow2_measure(QemuOpts *opts, BlockDriverState *in_bs,
     info = g_new(BlockMeasureInfo, 1);
     info->fully_allocated =
         qcow2_calc_prealloc_size(virtual_size, cluster_size,
-                                 ctz32(refcount_bits));
+                                 ctz32(refcount_bits)) + luks_payload_size;
 
     /* Remove data clusters that are not required.  This overestimates the
      * required size because metadata needed for the fully allocated file is
@@ -4924,6 +4998,12 @@ static QemuOptsList qcow2_create_opts = {
     }
 };
 
+static const char *const qcow2_strong_runtime_opts[] = {
+    "encrypt." BLOCK_CRYPTO_OPT_QCOW_KEY_SECRET,
+
+    NULL
+};
+
 BlockDriver bdrv_qcow2 = {
     .format_name        = "qcow2",
     .instance_size      = sizeof(BDRVQcow2State),
@@ -4972,6 +5052,7 @@ BlockDriver bdrv_qcow2 = {
     .bdrv_inactivate            = qcow2_inactivate,
 
     .create_opts         = &qcow2_create_opts,
+    .strong_runtime_opts = qcow2_strong_runtime_opts,
     .bdrv_co_check       = qcow2_co_check,
     .bdrv_amend_options  = qcow2_amend_options,