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authorAnthony Liguori <aliguori@us.ibm.com>2012-08-22 13:01:05 -0500
committerAnthony Liguori <aliguori@us.ibm.com>2012-08-22 13:01:05 -0500
commit7b2f89c435f895431d55b675dc412275c2069314 (patch)
tree5be26fa2548653d69d30733bf8d9e7eddf902af8
parentb6825cd79cdf3e2006c22bb8cfe47a0d7c5209fa (diff)
parenteec7f96c2cac88f59fd8c79b78a6e027df4abfb2 (diff)
downloadqemu-arm-7b2f89c435f895431d55b675dc412275c2069314.tar.gz
Merge remote-tracking branch 'kwolf/for-anthony' into staging
* kwolf/for-anthony: virtio-blk: hide VIRTIO_BLK_F_CONFIG_WCE from old machine types Documentation: Warn against qemu-img on active image vmdk: Read footer for streamOptimized images vmdk: Fix header structure Conflicts: hw/virtio-blk.c
-rw-r--r--block/vmdk.c58
-rw-r--r--hw/virtio-blk.h1
-rw-r--r--hw/virtio-pci.c1
-rw-r--r--qemu-img.texi10
4 files changed, 69 insertions, 1 deletions
diff --git a/block/vmdk.c b/block/vmdk.c
index daee4268be..bba4c61a74 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -35,6 +35,7 @@
#define VMDK4_FLAG_RGD (1 << 1)
#define VMDK4_FLAG_COMPRESS (1 << 16)
#define VMDK4_FLAG_MARKER (1 << 17)
+#define VMDK4_GD_AT_END 0xffffffffffffffffULL
typedef struct {
uint32_t version;
@@ -57,8 +58,8 @@ typedef struct {
int64_t desc_offset;
int64_t desc_size;
int32_t num_gtes_per_gte;
- int64_t gd_offset;
int64_t rgd_offset;
+ int64_t gd_offset;
int64_t grain_offset;
char filler[1];
char check_bytes[4];
@@ -115,6 +116,13 @@ typedef struct VmdkGrainMarker {
uint8_t data[0];
} VmdkGrainMarker;
+enum {
+ MARKER_END_OF_STREAM = 0,
+ MARKER_GRAIN_TABLE = 1,
+ MARKER_GRAIN_DIRECTORY = 2,
+ MARKER_FOOTER = 3,
+};
+
static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename)
{
uint32_t magic;
@@ -451,6 +459,54 @@ static int vmdk_open_vmdk4(BlockDriverState *bs,
if (header.capacity == 0 && header.desc_offset) {
return vmdk_open_desc_file(bs, flags, header.desc_offset << 9);
}
+
+ if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) {
+ /*
+ * The footer takes precedence over the header, so read it in. The
+ * footer starts at offset -1024 from the end: One sector for the
+ * footer, and another one for the end-of-stream marker.
+ */
+ struct {
+ struct {
+ uint64_t val;
+ uint32_t size;
+ uint32_t type;
+ uint8_t pad[512 - 16];
+ } QEMU_PACKED footer_marker;
+
+ uint32_t magic;
+ VMDK4Header header;
+ uint8_t pad[512 - 4 - sizeof(VMDK4Header)];
+
+ struct {
+ uint64_t val;
+ uint32_t size;
+ uint32_t type;
+ uint8_t pad[512 - 16];
+ } QEMU_PACKED eos_marker;
+ } QEMU_PACKED footer;
+
+ ret = bdrv_pread(file,
+ bs->file->total_sectors * 512 - 1536,
+ &footer, sizeof(footer));
+ if (ret < 0) {
+ return ret;
+ }
+
+ /* Some sanity checks for the footer */
+ if (be32_to_cpu(footer.magic) != VMDK4_MAGIC ||
+ le32_to_cpu(footer.footer_marker.size) != 0 ||
+ le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER ||
+ le64_to_cpu(footer.eos_marker.val) != 0 ||
+ le32_to_cpu(footer.eos_marker.size) != 0 ||
+ le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM)
+ {
+ return -EINVAL;
+ }
+
+ header = footer.header;
+ }
+
l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gte)
* le64_to_cpu(header.granularity);
if (l1_entry_sectors == 0) {
diff --git a/hw/virtio-blk.h b/hw/virtio-blk.h
index 651a000b9f..f0740d01af 100644
--- a/hw/virtio-blk.h
+++ b/hw/virtio-blk.h
@@ -104,6 +104,7 @@ struct VirtIOBlkConf
BlockConf conf;
char *serial;
uint32_t scsi;
+ uint32_t config_wce;
};
#define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 5e6e09efb7..2a3d86f176 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -886,6 +886,7 @@ static Property virtio_blk_properties[] = {
#ifdef __linux__
DEFINE_PROP_BIT("scsi", VirtIOPCIProxy, blk.scsi, 0, true),
#endif
+ DEFINE_PROP_BIT("config-wce", VirtIOPCIProxy, blk.config_wce, 0, true),
DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
DEFINE_VIRTIO_BLK_FEATURES(VirtIOPCIProxy, host_features),
diff --git a/qemu-img.texi b/qemu-img.texi
index 77c6d0b6b0..6b42e35fe7 100644
--- a/qemu-img.texi
+++ b/qemu-img.texi
@@ -4,6 +4,16 @@ usage: qemu-img command [command options]
@c man end
@end example
+@c man begin DESCRIPTION
+qemu-img allows you to create, convert and modify images offline. It can handle
+all image formats supported by QEMU.
+
+@b{Warning:} Never use qemu-img to modify images in use by a running virtual
+machine or any other process; this may destroy the image. Also, be aware that
+querying an image that is being modified by another process may encounter
+inconsistent state.
+@c man end
+
@c man begin OPTIONS
The following commands are supported: