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util: add support for qcow2v3 image detection
Detect qcow2 images with version 3 in the image header as VIR_STORAGE_FILE_QCOW2. These images have a feature bitfield, with just one feature supported so far: lazy_refcounts. The header length changed too, moving the location of the backing format name.
This commit is contained in:
parent
19f75d5eeb
commit
a1ee8e18c9
@ -59,6 +59,11 @@ VIR_ENUM_IMPL(virStorageFileFormat,
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"qcow", "qcow2", "qed", "vmdk", "vpc",
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"qcow", "qcow2", "qed", "vmdk", "vpc",
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"fat", "vhd", "vdi")
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"fat", "vhd", "vdi")
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VIR_ENUM_IMPL(virStorageFileFeature,
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VIR_STORAGE_FILE_FEATURE_LAST,
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"lazy_refcounts",
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)
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enum lv_endian {
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enum lv_endian {
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LV_LITTLE_ENDIAN = 1, /* 1234 */
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LV_LITTLE_ENDIAN = 1, /* 1234 */
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LV_BIG_ENDIAN /* 4321 */
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LV_BIG_ENDIAN /* 4321 */
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@ -70,6 +75,8 @@ enum {
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BACKING_STORE_ERROR,
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BACKING_STORE_ERROR,
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};
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};
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#define FILE_TYPE_VERSIONS_LAST 2
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/* Either 'magic' or 'extension' *must* be provided */
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/* Either 'magic' or 'extension' *must* be provided */
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struct FileTypeInfo {
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struct FileTypeInfo {
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int magicOffset; /* Byte offset of the magic */
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int magicOffset; /* Byte offset of the magic */
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@ -81,7 +88,8 @@ struct FileTypeInfo {
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* where we find version number,
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* where we find version number,
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* -1 to always fail the version test,
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* -1 to always fail the version test,
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* -2 to always pass the version test */
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* -2 to always pass the version test */
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int versionNumber; /* Version number to validate */
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int versionNumbers[FILE_TYPE_VERSIONS_LAST];
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/* Version numbers to validate. Zeroes are ignored. */
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int sizeOffset; /* Byte offset from start of file
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int sizeOffset; /* Byte offset from start of file
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* where we find capacity info,
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* where we find capacity info,
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* -1 to use st_size as capacity */
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* -1 to use st_size as capacity */
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@ -95,6 +103,8 @@ struct FileTypeInfo {
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* -1 if encryption is not used */
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* -1 if encryption is not used */
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int (*getBackingStore)(char **res, int *format,
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int (*getBackingStore)(char **res, int *format,
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const unsigned char *buf, size_t buf_size);
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const unsigned char *buf, size_t buf_size);
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int (*getFeatures)(virBitmapPtr *features, int format,
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unsigned char *buf, ssize_t len);
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};
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};
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static int cowGetBackingStore(char **, int *,
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static int cowGetBackingStore(char **, int *,
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@ -103,6 +113,8 @@ static int qcow1GetBackingStore(char **, int *,
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const unsigned char *, size_t);
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const unsigned char *, size_t);
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static int qcow2GetBackingStore(char **, int *,
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static int qcow2GetBackingStore(char **, int *,
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const unsigned char *, size_t);
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const unsigned char *, size_t);
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static int qcow2GetFeatures(virBitmapPtr *features, int format,
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unsigned char *buf, ssize_t len);
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static int vmdk4GetBackingStore(char **, int *,
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static int vmdk4GetBackingStore(char **, int *,
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const unsigned char *, size_t);
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const unsigned char *, size_t);
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static int
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static int
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@ -122,6 +134,13 @@ qedGetBackingStore(char **, int *, const unsigned char *, size_t);
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#define QCOW2_HDR_EXTENSION_END 0
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#define QCOW2_HDR_EXTENSION_END 0
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#define QCOW2_HDR_EXTENSION_BACKING_FORMAT 0xE2792ACA
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#define QCOW2_HDR_EXTENSION_BACKING_FORMAT 0xE2792ACA
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#define QCOW2v3_HDR_FEATURES_INCOMPATIBLE (QCOW2_HDR_TOTAL_SIZE)
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#define QCOW2v3_HDR_FEATURES_COMPATIBLE (QCOW2v3_HDR_FEATURES_INCOMPATIBLE+8)
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#define QCOW2v3_HDR_FEATURES_AUTOCLEAR (QCOW2v3_HDR_FEATURES_COMPATIBLE+8)
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/* The location of the header size [4 bytes] */
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#define QCOW2v3_HDR_SIZE (QCOW2_HDR_TOTAL_SIZE+8+8+8+4)
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#define QED_HDR_FEATURES_OFFSET (4+4+4+4)
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#define QED_HDR_FEATURES_OFFSET (4+4+4+4)
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#define QED_HDR_IMAGE_SIZE (QED_HDR_FEATURES_OFFSET+8+8+8+8)
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#define QED_HDR_IMAGE_SIZE (QED_HDR_FEATURES_OFFSET+8+8+8+8)
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#define QED_HDR_BACKING_FILE_OFFSET (QED_HDR_IMAGE_SIZE+8)
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#define QED_HDR_BACKING_FILE_OFFSET (QED_HDR_IMAGE_SIZE+8)
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@ -137,16 +156,16 @@ qedGetBackingStore(char **, int *, const unsigned char *, size_t);
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static struct FileTypeInfo const fileTypeInfo[] = {
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static struct FileTypeInfo const fileTypeInfo[] = {
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[VIR_STORAGE_FILE_NONE] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
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[VIR_STORAGE_FILE_NONE] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
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-1, 0, 0, 0, 0, 0, NULL },
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-1, {0}, 0, 0, 0, 0, NULL, NULL },
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[VIR_STORAGE_FILE_RAW] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
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[VIR_STORAGE_FILE_RAW] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
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-1, 0, 0, 0, 0, 0, NULL },
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-1, {0}, 0, 0, 0, 0, NULL, NULL },
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[VIR_STORAGE_FILE_DIR] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
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[VIR_STORAGE_FILE_DIR] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
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-1, 0, 0, 0, 0, 0, NULL },
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-1, {0}, 0, 0, 0, 0, NULL, NULL },
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[VIR_STORAGE_FILE_BOCHS] = {
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[VIR_STORAGE_FILE_BOCHS] = {
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/*"Bochs Virtual HD Image", */ /* Untested */
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/*"Bochs Virtual HD Image", */ /* Untested */
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0, NULL, NULL,
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0, NULL, NULL,
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LV_LITTLE_ENDIAN, 64, 0x20000,
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LV_LITTLE_ENDIAN, 64, {0x20000},
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32+16+16+4+4+4+4+4, 8, 1, -1, NULL
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32+16+16+4+4+4+4+4, 8, 1, -1, NULL, NULL
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},
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},
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[VIR_STORAGE_FILE_CLOOP] = {
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[VIR_STORAGE_FILE_CLOOP] = {
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/* #!/bin/sh
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/* #!/bin/sh
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@ -154,67 +173,82 @@ static struct FileTypeInfo const fileTypeInfo[] = {
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modprobe cloop file=$0 && mount -r -t iso9660 /dev/cloop $1
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modprobe cloop file=$0 && mount -r -t iso9660 /dev/cloop $1
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*/ /* Untested */
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*/ /* Untested */
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0, NULL, NULL,
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0, NULL, NULL,
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LV_LITTLE_ENDIAN, -1, 0,
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LV_LITTLE_ENDIAN, -1, {0},
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-1, 0, 0, -1, NULL
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-1, 0, 0, -1, NULL, NULL
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},
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},
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[VIR_STORAGE_FILE_COW] = {
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[VIR_STORAGE_FILE_COW] = {
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0, "OOOM", NULL,
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0, "OOOM", NULL,
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LV_BIG_ENDIAN, 4, 2,
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LV_BIG_ENDIAN, 4, {2},
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4+4+1024+4, 8, 1, -1, cowGetBackingStore
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4+4+1024+4, 8, 1, -1, cowGetBackingStore, NULL
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},
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},
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[VIR_STORAGE_FILE_DMG] = {
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[VIR_STORAGE_FILE_DMG] = {
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/* XXX QEMU says there's no magic for dmg,
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/* XXX QEMU says there's no magic for dmg,
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* /usr/share/misc/magic lists double magic (both offsets
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* /usr/share/misc/magic lists double magic (both offsets
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* would have to match) but then disables that check. */
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* would have to match) but then disables that check. */
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0, NULL, ".dmg",
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0, NULL, ".dmg",
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0, -1, 0,
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0, -1, {0},
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-1, 0, 0, -1, NULL
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-1, 0, 0, -1, NULL, NULL
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},
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},
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[VIR_STORAGE_FILE_ISO] = {
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[VIR_STORAGE_FILE_ISO] = {
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32769, "CD001", ".iso",
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32769, "CD001", ".iso",
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LV_LITTLE_ENDIAN, -2, 0,
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LV_LITTLE_ENDIAN, -2, {0},
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-1, 0, 0, -1, NULL
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-1, 0, 0, -1, NULL, NULL
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},
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},
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[VIR_STORAGE_FILE_QCOW] = {
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[VIR_STORAGE_FILE_QCOW] = {
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0, "QFI", NULL,
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0, "QFI", NULL,
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LV_BIG_ENDIAN, 4, 1,
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LV_BIG_ENDIAN, 4, {1},
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QCOWX_HDR_IMAGE_SIZE, 8, 1, QCOW1_HDR_CRYPT, qcow1GetBackingStore,
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QCOWX_HDR_IMAGE_SIZE, 8, 1, QCOW1_HDR_CRYPT, qcow1GetBackingStore, NULL
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},
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},
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[VIR_STORAGE_FILE_QCOW2] = {
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[VIR_STORAGE_FILE_QCOW2] = {
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0, "QFI", NULL,
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0, "QFI", NULL,
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LV_BIG_ENDIAN, 4, 2,
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LV_BIG_ENDIAN, 4, {2, 3},
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QCOWX_HDR_IMAGE_SIZE, 8, 1, QCOW2_HDR_CRYPT, qcow2GetBackingStore,
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QCOWX_HDR_IMAGE_SIZE, 8, 1, QCOW2_HDR_CRYPT, qcow2GetBackingStore,
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qcow2GetFeatures
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},
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},
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[VIR_STORAGE_FILE_QED] = {
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[VIR_STORAGE_FILE_QED] = {
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/* http://wiki.qemu.org/Features/QED */
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/* http://wiki.qemu.org/Features/QED */
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0, "QED", NULL,
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0, "QED", NULL,
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LV_LITTLE_ENDIAN, -2, -1,
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LV_LITTLE_ENDIAN, -2, {0},
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QED_HDR_IMAGE_SIZE, 8, 1, -1, qedGetBackingStore,
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QED_HDR_IMAGE_SIZE, 8, 1, -1, qedGetBackingStore, NULL
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},
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},
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[VIR_STORAGE_FILE_VMDK] = {
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[VIR_STORAGE_FILE_VMDK] = {
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0, "KDMV", NULL,
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0, "KDMV", NULL,
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LV_LITTLE_ENDIAN, 4, 1,
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LV_LITTLE_ENDIAN, 4, {1},
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4+4+4, 8, 512, -1, vmdk4GetBackingStore
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4+4+4, 8, 512, -1, vmdk4GetBackingStore, NULL
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},
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},
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[VIR_STORAGE_FILE_VPC] = {
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[VIR_STORAGE_FILE_VPC] = {
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0, "conectix", NULL,
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0, "conectix", NULL,
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LV_BIG_ENDIAN, 12, 0x10000,
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LV_BIG_ENDIAN, 12, {0x10000},
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8 + 4 + 4 + 8 + 4 + 4 + 2 + 2 + 4, 8, 1, -1, NULL
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8 + 4 + 4 + 8 + 4 + 4 + 2 + 2 + 4, 8, 1, -1, NULL, NULL
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},
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},
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/* TODO: add getBackingStore function */
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/* TODO: add getBackingStore function */
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[VIR_STORAGE_FILE_VDI] = {
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[VIR_STORAGE_FILE_VDI] = {
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64, "\x7f\x10\xda\xbe", ".vdi",
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64, "\x7f\x10\xda\xbe", ".vdi",
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LV_LITTLE_ENDIAN, 68, 0x00010001,
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LV_LITTLE_ENDIAN, 68, {0x00010001},
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64 + 5 * 4 + 256 + 7 * 4, 8, 1, -1, NULL},
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64 + 5 * 4 + 256 + 7 * 4, 8, 1, -1, NULL, NULL},
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/* Not direct file formats, but used for various drivers */
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/* Not direct file formats, but used for various drivers */
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[VIR_STORAGE_FILE_FAT] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
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[VIR_STORAGE_FILE_FAT] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
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-1, 0, 0, 0, 0, 0, NULL },
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-1, {0}, 0, 0, 0, 0, NULL, NULL },
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[VIR_STORAGE_FILE_VHD] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
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[VIR_STORAGE_FILE_VHD] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
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-1, 0, 0, 0, 0, 0, NULL },
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-1, {0}, 0, 0, 0, 0, NULL, NULL },
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};
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};
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verify(ARRAY_CARDINALITY(fileTypeInfo) == VIR_STORAGE_FILE_LAST);
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verify(ARRAY_CARDINALITY(fileTypeInfo) == VIR_STORAGE_FILE_LAST);
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/* qcow2 compatible features in the order they appear on-disk */
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enum qcow2CompatibleFeature {
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QCOW2_COMPATIBLE_FEATURE_LAZY_REFCOUNTS = 0,
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QCOW2_COMPATIBLE_FEATURE_LAST
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};
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/* conversion to virStorageFileFeature */
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static const int qcow2CompatibleFeatureArray[] = {
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VIR_STORAGE_FILE_FEATURE_LAZY_REFCOUNTS,
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};
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verify(ARRAY_CARDINALITY(qcow2CompatibleFeatureArray) ==
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QCOW2_COMPATIBLE_FEATURE_LAST);
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static int
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static int
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cowGetBackingStore(char **res,
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cowGetBackingStore(char **res,
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int *format,
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int *format,
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@ -301,6 +335,8 @@ qcowXGetBackingStore(char **res,
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{
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{
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unsigned long long offset;
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unsigned long long offset;
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unsigned int size;
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unsigned int size;
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unsigned long long start;
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int version;
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*res = NULL;
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*res = NULL;
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if (format)
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if (format)
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@ -351,11 +387,20 @@ qcowXGetBackingStore(char **res,
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* Thus the file region to search for extensions is
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* Thus the file region to search for extensions is
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* between the end of the header (QCOW2_HDR_TOTAL_SIZE)
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* between the end of the header (QCOW2_HDR_TOTAL_SIZE)
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* and the start of the backingStoreName (offset)
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* and the start of the backingStoreName (offset)
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*
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* for qcow2 v3 images, the length of the header
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* is stored at QCOW2v3_HDR_SIZE
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*/
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*/
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if (isQCow2 && format &&
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if (isQCow2 && format) {
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qcow2GetBackingStoreFormat(format, buf, buf_size, QCOW2_HDR_TOTAL_SIZE,
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version = virReadBufInt32BE(buf + QCOWX_HDR_VERSION);
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offset) < 0)
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if (version == 2)
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return BACKING_STORE_INVALID;
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start = QCOW2_HDR_TOTAL_SIZE;
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else
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start = virReadBufInt32BE(buf + QCOW2v3_HDR_SIZE);
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if (qcow2GetBackingStoreFormat(format, buf, buf_size,
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start, offset) < 0)
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return BACKING_STORE_INVALID;
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}
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return BACKING_STORE_OK;
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return BACKING_STORE_OK;
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}
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}
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@ -593,7 +638,7 @@ virStorageFileMatchesVersion(int format,
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unsigned char *buf,
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unsigned char *buf,
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size_t buflen)
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size_t buflen)
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{
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{
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int version;
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int version, i;
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/* Validate version number info */
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/* Validate version number info */
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if (fileTypeInfo[format].versionOffset == -1)
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if (fileTypeInfo[format].versionOffset == -1)
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@ -611,12 +656,16 @@ virStorageFileMatchesVersion(int format,
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else
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else
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version = virReadBufInt32BE(buf + fileTypeInfo[format].versionOffset);
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version = virReadBufInt32BE(buf + fileTypeInfo[format].versionOffset);
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VIR_DEBUG("Compare detected version %d vs expected version %d",
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for (i = 0;
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version, fileTypeInfo[format].versionNumber);
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i < FILE_TYPE_VERSIONS_LAST && fileTypeInfo[format].versionNumbers[i];
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if (version != fileTypeInfo[format].versionNumber)
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i++) {
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return false;
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VIR_DEBUG("Compare detected version %d vs one of the expected versions %d",
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version, fileTypeInfo[format].versionNumbers[i]);
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if (version == fileTypeInfo[format].versionNumbers[i])
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return true;
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}
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return true;
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return false;
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}
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}
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static bool
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static bool
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@ -669,6 +718,42 @@ cleanup:
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}
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}
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static int
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qcow2GetFeatures(virBitmapPtr *features,
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int format,
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unsigned char *buf,
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ssize_t len)
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{
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int version = -1;
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virBitmapPtr feat = NULL;
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uint64_t bits;
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int i;
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version = virReadBufInt32BE(buf + fileTypeInfo[format].versionOffset);
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if (version == 2)
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return 0;
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if (len < QCOW2v3_HDR_SIZE)
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return -1;
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if (!(feat = virBitmapNew(VIR_STORAGE_FILE_FEATURE_LAST))) {
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virReportOOMError();
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return -1;
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}
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/* todo: check for incompatible or autoclear features? */
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bits = virReadBufInt64BE(buf + QCOW2v3_HDR_FEATURES_COMPATIBLE);
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for (i = 0; i < QCOW2_COMPATIBLE_FEATURE_LAST; i++) {
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if (bits & ((uint64_t) 1 << i))
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ignore_value(virBitmapSetBit(feat, qcow2CompatibleFeatureArray[i]));
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}
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*features = feat;
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return 0;
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}
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||||||
|
|
||||||
/* Given a file descriptor FD open on PATH, and optionally opened from
|
/* Given a file descriptor FD open on PATH, and optionally opened from
|
||||||
* a given DIRECTORY, return metadata about that file, assuming it has
|
* a given DIRECTORY, return metadata about that file, assuming it has
|
||||||
* the given FORMAT. */
|
* the given FORMAT. */
|
||||||
@ -803,6 +888,14 @@ virStorageFileGetMetadataInternal(const char *path,
|
|||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
if (fileTypeInfo[format].getFeatures != NULL &&
|
||||||
|
fileTypeInfo[format].getFeatures(&meta->features, format, buf, len) < 0)
|
||||||
|
goto cleanup;
|
||||||
|
|
||||||
|
if (format == VIR_STORAGE_FILE_QCOW2 && meta->features &&
|
||||||
|
VIR_STRDUP(meta->compat, "1.1") < 0)
|
||||||
|
goto cleanup;
|
||||||
|
|
||||||
done:
|
done:
|
||||||
ret = meta;
|
ret = meta;
|
||||||
meta = NULL;
|
meta = NULL;
|
||||||
@ -1032,7 +1125,9 @@ virStorageFileFreeMetadata(virStorageFileMetadata *meta)
|
|||||||
virStorageFileFreeMetadata(meta->backingMeta);
|
virStorageFileFreeMetadata(meta->backingMeta);
|
||||||
VIR_FREE(meta->backingStore);
|
VIR_FREE(meta->backingStore);
|
||||||
VIR_FREE(meta->backingStoreRaw);
|
VIR_FREE(meta->backingStoreRaw);
|
||||||
|
VIR_FREE(meta->compat);
|
||||||
VIR_FREE(meta->directory);
|
VIR_FREE(meta->directory);
|
||||||
|
virBitmapFree(meta->features);
|
||||||
VIR_FREE(meta);
|
VIR_FREE(meta);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -24,6 +24,7 @@
|
|||||||
#ifndef __VIR_STORAGE_FILE_H__
|
#ifndef __VIR_STORAGE_FILE_H__
|
||||||
# define __VIR_STORAGE_FILE_H__
|
# define __VIR_STORAGE_FILE_H__
|
||||||
|
|
||||||
|
# include "virbitmap.h"
|
||||||
# include "virutil.h"
|
# include "virutil.h"
|
||||||
|
|
||||||
enum virStorageFileFormat {
|
enum virStorageFileFormat {
|
||||||
@ -51,6 +52,15 @@ enum virStorageFileFormat {
|
|||||||
|
|
||||||
VIR_ENUM_DECL(virStorageFileFormat);
|
VIR_ENUM_DECL(virStorageFileFormat);
|
||||||
|
|
||||||
|
enum virStorageFileFeature {
|
||||||
|
VIR_STORAGE_FILE_FEATURE_NONE = -1,
|
||||||
|
VIR_STORAGE_FILE_FEATURE_LAZY_REFCOUNTS,
|
||||||
|
|
||||||
|
VIR_STORAGE_FILE_FEATURE_LAST
|
||||||
|
};
|
||||||
|
|
||||||
|
VIR_ENUM_DECL(virStorageFileFeature);
|
||||||
|
|
||||||
typedef struct _virStorageFileMetadata virStorageFileMetadata;
|
typedef struct _virStorageFileMetadata virStorageFileMetadata;
|
||||||
typedef virStorageFileMetadata *virStorageFileMetadataPtr;
|
typedef virStorageFileMetadata *virStorageFileMetadataPtr;
|
||||||
struct _virStorageFileMetadata {
|
struct _virStorageFileMetadata {
|
||||||
@ -62,6 +72,8 @@ struct _virStorageFileMetadata {
|
|||||||
virStorageFileMetadataPtr backingMeta;
|
virStorageFileMetadataPtr backingMeta;
|
||||||
unsigned long long capacity;
|
unsigned long long capacity;
|
||||||
bool encrypted;
|
bool encrypted;
|
||||||
|
virBitmapPtr features; /* bits described by enum virStorageFileFeature */
|
||||||
|
char *compat;
|
||||||
};
|
};
|
||||||
|
|
||||||
# ifndef DEV_BSIZE
|
# ifndef DEV_BSIZE
|
||||||
|
Loading…
Reference in New Issue
Block a user