Block patches for master

index a1773e4..28338bf 100644
@@ -355,7 +355,7 @@ int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov,
     else
         n1 = bs->total_sectors - sector_num;
 
-    qemu_iovec_memset(qiov, 0, 512 * (nb_sectors - n1));
+    qemu_iovec_memset_skip(qiov, 0, 512 * (nb_sectors - n1), 512 * n1);
 
     return n1;
 }

@@ -478,8 +478,7 @@ static void qcow2_aio_read_cb(void *opaque, int ret)
             if (n1 > 0) {
                 BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
                 acb->hd_aiocb = bdrv_aio_readv(bs->backing_hd, acb->sector_num,
-                                    &acb->hd_qiov, acb->cur_nr_sectors,
-				    qcow2_aio_read_cb, acb);
+                                    &acb->hd_qiov, n1, qcow2_aio_read_cb, acb);
                 if (acb->hd_aiocb == NULL)
                     goto done;
             } else {

index 8d562b2..f9a7e36 100644
@@ -267,6 +267,37 @@ void qemu_iovec_memset(QEMUIOVector *qiov, int c, size_t count)
     }
 }
 
+void qemu_iovec_memset_skip(QEMUIOVector *qiov, int c, size_t count,
+                            size_t skip)
+{
+    int i;
+    size_t done;
+    void *iov_base;
+    uint64_t iov_len;
+
+    done = 0;
+    for (i = 0; (i < qiov->niov) && (done != count); i++) {
+        if (skip >= qiov->iov[i].iov_len) {
+            /* Skip the whole iov */
+            skip -= qiov->iov[i].iov_len;
+            continue;
+        } else {
+            /* Skip only part (or nothing) of the iov */
+            iov_base = (uint8_t*) qiov->iov[i].iov_base + skip;
+            iov_len = qiov->iov[i].iov_len - skip;
+            skip = 0;
+        }
+
+        if (done + iov_len > count) {
+            memset(iov_base, c, count - done);
+            break;
+        } else {
+            memset(iov_base, c, iov_len);
+        }
+        done += iov_len;
+    }
+}
+
 #ifndef _WIN32
 /* Sets a specific flag */
 int fcntl_setfl(int fd, int flag)

index c7ff280..cb4b7e0 100644
@@ -322,6 +322,8 @@ void qemu_iovec_reset(QEMUIOVector *qiov);
 void qemu_iovec_to_buffer(QEMUIOVector *qiov, void *buf);
 void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count);
 void qemu_iovec_memset(QEMUIOVector *qiov, int c, size_t count);
+void qemu_iovec_memset_skip(QEMUIOVector *qiov, int c, size_t count,
+                            size_t skip);
 
 struct Monitor;
 typedef struct Monitor Monitor;

index 28338bf..647c2a4 100644
@@ -479,8 +479,10 @@ static void qcow2_aio_read_cb(void *opaque, int ret)
                 BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
                 acb->hd_aiocb = bdrv_aio_readv(bs->backing_hd, acb->sector_num,
                                     &acb->hd_qiov, n1, qcow2_aio_read_cb, acb);
-                if (acb->hd_aiocb == NULL)
+                if (acb->hd_aiocb == NULL) {
+                    ret = -EIO;
                     goto done;
+                }
             } else {
                 ret = qcow2_schedule_bh(qcow2_aio_read_bh, acb);
                 if (ret < 0)

index 5fb8c66..437aaa8 100644
@@ -878,11 +878,11 @@ int qcow2_decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset)
         BLKDBG_EVENT(bs->file, BLKDBG_READ_COMPRESSED);
         ret = bdrv_read(bs->file, coffset >> 9, s->cluster_data, nb_csectors);
         if (ret < 0) {
-            return -1;
+            return ret;
         }
         if (decompress_buffer(s->cluster_cache, s->cluster_size,
                               s->cluster_data + sector_offset, csize) < 0) {
-            return -1;
+            return -EIO;
         }
         s->cluster_cache_offset = coffset;
     }

index 647c2a4..551b3c2 100644
@@ -497,8 +497,10 @@ static void qcow2_aio_read_cb(void *opaque, int ret)
         }
     } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) {
         /* add AIO support for compressed blocks ? */
-        if (qcow2_decompress_cluster(bs, acb->cluster_offset) < 0)
+        ret = qcow2_decompress_cluster(bs, acb->cluster_offset);
+        if (ret < 0) {
             goto done;
+        }
 
         qemu_iovec_from_buffer(&acb->hd_qiov,
             s->cluster_cache + index_in_cluster * 512,

index 9d0cdeb..4855604 100644
@@ -201,6 +201,11 @@ static const QErrorStringTable qerror_table[] = {
         .desc      = "An undefined error has ocurred",
     },
     {
+        .error_fmt = QERR_UNKNOWN_BLOCK_FORMAT_FEATURE,
+        .desc      = "'%(device)' uses a %(format) feature which is not "
+                     "supported by this qemu version: %(feature)",
+    },
+    {
         .error_fmt = QERR_VNC_SERVER_FAILED,
         .desc      = "Could not start VNC server on %(target)",
     },

index b0f69da..f732d45 100644
@@ -165,6 +165,9 @@ QError *qobject_to_qerror(const QObject *obj);
 #define QERR_UNDEFINED_ERROR \
     "{ 'class': 'UndefinedError', 'data': {} }"
 
+#define QERR_UNKNOWN_BLOCK_FORMAT_FEATURE \
+    "{ 'class': 'UnknownBlockFormatFeature', 'data': { 'device': %s, 'format': %s, 'feature': %s } }"
+
 #define QERR_VNC_SERVER_FAILED \
     "{ 'class': 'VNCServerFailed', 'data': { 'target': %s } }"
 

index 551b3c2..75b8bec 100644
@@ -28,6 +28,7 @@
 #include "aes.h"
 #include "block/qcow2.h"
 #include "qemu-error.h"
+#include "qerror.h"
 
 /*
   Differences with QCOW:

@@ -59,7 +60,7 @@ static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename)
 
     if (buf_size >= sizeof(QCowHeader) &&
         be32_to_cpu(cow_header->magic) == QCOW_MAGIC &&
-        be32_to_cpu(cow_header->version) == QCOW_VERSION)
+        be32_to_cpu(cow_header->version) >= QCOW_VERSION)
         return 100;
     else
         return 0;

@@ -163,10 +164,18 @@ static int qcow2_open(BlockDriverState *bs, int flags)
     be64_to_cpus(&header.snapshots_offset);
     be32_to_cpus(&header.nb_snapshots);
 
-    if (header.magic != QCOW_MAGIC || header.version != QCOW_VERSION) {
+    if (header.magic != QCOW_MAGIC) {
         ret = -EINVAL;
         goto fail;
     }
+    if (header.version != QCOW_VERSION) {
+        char version[64];
+        snprintf(version, sizeof(version), "QCOW version %d", header.version);
+        qerror_report(QERR_UNKNOWN_BLOCK_FORMAT_FEATURE,
+            bs->device_name, "qcow2", version);
+        ret = -ENOTSUP;
+        goto fail;
+    }
     if (header.cluster_bits < MIN_CLUSTER_BITS ||
         header.cluster_bits > MAX_CLUSTER_BITS) {
         ret = -EINVAL;

index 3273448..75ae244 100644
@@ -14,6 +14,7 @@
 
 #include "trace.h"
 #include "qed.h"
+#include "qerror.h"
 
 static void qed_aio_cancel(BlockDriverAIOCB *blockacb)
 {

@@ -311,7 +312,13 @@ static int bdrv_qed_open(BlockDriverState *bs, int flags)
         return -EINVAL;
     }
     if (s->header.features & ~QED_FEATURE_MASK) {
-        return -ENOTSUP; /* image uses unsupported feature bits */
+        /* image uses unsupported feature bits */
+        char buf[64];
+        snprintf(buf, sizeof(buf), "%" PRIx64,
+            s->header.features & ~QED_FEATURE_MASK);
+        qerror_report(QERR_UNKNOWN_BLOCK_FORMAT_FEATURE,
+            bs->device_name, "QED", buf);
+        return -ENOTSUP;
     }
     if (!qed_is_cluster_size_valid(s->header.cluster_size)) {
         return -EINVAL;

index 4a37358..7e3cc4c 100644
@@ -213,8 +213,9 @@ static BlockDriverState *bdrv_new_open(const char *filename,
     BlockDriverState *bs;
     BlockDriver *drv;
     char password[256];
+    int ret;
 
-    bs = bdrv_new("");
+    bs = bdrv_new("image");
 
     if (fmt) {
         drv = bdrv_find_format(fmt);

@@ -225,10 +226,13 @@ static BlockDriverState *bdrv_new_open(const char *filename,
     } else {
         drv = NULL;
     }
-    if (bdrv_open(bs, filename, flags, drv) < 0) {
-        error_report("Could not open '%s'", filename);
+
+    ret = bdrv_open(bs, filename, flags, drv);
+    if (ret < 0) {
+        error_report("Could not open '%s': %s", filename, strerror(-ret));
         goto fail;
     }
+
     if (bdrv_is_encrypted(bs)) {
         printf("Disk image '%s' is encrypted.\n", filename);
         if (read_password(password, sizeof(password)) < 0) {

index ecfadc1..24d7658 100644
@@ -182,6 +182,7 @@ static void drive_uninit(DriveInfo *dinfo)
 {
     qemu_opts_del(dinfo->opts);
     bdrv_delete(dinfo->bdrv);
+    qemu_free(dinfo->id);
     QTAILQ_REMOVE(&drives, dinfo, next);
     qemu_free(dinfo);
 }

index 24d7658..0690cc8 100644
@@ -526,7 +526,7 @@ DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
     } else if (ro == 1) {
         if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
             error_report("readonly not supported by this bus type");
-            return NULL;
+            goto err;
         }
     }
 

@@ -536,12 +536,19 @@ DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
     if (ret < 0) {
         error_report("could not open disk image %s: %s",
                      file, strerror(-ret));
-        return NULL;
+        goto err;
     }
 
     if (bdrv_key_required(dinfo->bdrv))
         autostart = 0;
     return dinfo;
+
+err:
+    bdrv_delete(dinfo->bdrv);
+    qemu_free(dinfo->id);
+    QTAILQ_REMOVE(&drives, dinfo, next);
+    qemu_free(dinfo);
+    return NULL;
 }
 
 void do_commit(Monitor *mon, const QDict *qdict)

index 437aaa8..750abe3 100644
@@ -515,13 +515,16 @@ static int get_cluster_table(BlockDriverState *bs, uint64_t offset,
             return ret;
         }
     } else {
-        /* FIXME Order */
-        if (l2_offset)
-            qcow2_free_clusters(bs, l2_offset, s->l2_size * sizeof(uint64_t));
+        /* First allocate a new L2 table (and do COW if needed) */
         ret = l2_allocate(bs, l1_index, &l2_table);
         if (ret < 0) {
             return ret;
         }
+
+        /* Then decrease the refcount of the old table */
+        if (l2_offset) {
+            qcow2_free_clusters(bs, l2_offset, s->l2_size * sizeof(uint64_t));
+        }
         l2_offset = s->l1_table[l1_index] & ~QCOW_OFLAG_COPIED;
     }