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qcow2: Basic definitions for external data files 

This adds basic constants, struct fields and helper function for
external data file support to the implementation.

QCOW2_INCOMPAT_MASK and QCOW2_AUTOCLEAR_MASK are not updated yet so that
opening images with an external data file still fails (we don't handle
them correctly yet).

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2019-01-14 16:48:25 +01:00
parent 65a3d073e9
commit 93c2493646
5 changed files with 43 additions and 22 deletions
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9
block/qcow2.c
View File

@ -73,6 +73,7 @@ typedef struct {
#define QCOW2_EXT_MAGIC_FEATURE_TABLE 0x6803f857
#define QCOW2_EXT_MAGIC_CRYPTO_HEADER 0x0537be77
#define QCOW2_EXT_MAGIC_BITMAPS 0x23852875
#define QCOW2_EXT_MAGIC_DATA_FILE 0x44415441
static int coroutine_fn
qcow2_co_preadv_compressed(BlockDriverState *bs,
@ -1452,6 +1453,9 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options,
goto fail;
}
/* TODO Open external data file */
s->data_file = bs->file;
/* qcow2_read_extension may have set up the crypto context
* if the crypt method needs a header region, some methods
* don't need header extensions, so must check here
@ -2440,6 +2444,11 @@ int qcow2_update_header(BlockDriverState *bs)
.bit = QCOW2_INCOMPAT_CORRUPT_BITNR,
.name = "corrupt bit",
},
{
.type = QCOW2_FEAT_TYPE_INCOMPATIBLE,
.bit = QCOW2_INCOMPAT_DATA_FILE_BITNR,
.name = "external data file",
},
{
.type = QCOW2_FEAT_TYPE_COMPATIBLE,
.bit = QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR,

30
block/qcow2.h
View File

@ -197,13 +197,15 @@ enum {
/* Incompatible feature bits */
enum {
QCOW2_INCOMPAT_DIRTY_BITNR = 0,
QCOW2_INCOMPAT_CORRUPT_BITNR = 1,
QCOW2_INCOMPAT_DIRTY = 1 << QCOW2_INCOMPAT_DIRTY_BITNR,
QCOW2_INCOMPAT_CORRUPT = 1 << QCOW2_INCOMPAT_CORRUPT_BITNR,
QCOW2_INCOMPAT_DIRTY_BITNR = 0,
QCOW2_INCOMPAT_CORRUPT_BITNR = 1,
QCOW2_INCOMPAT_DATA_FILE_BITNR = 2,
QCOW2_INCOMPAT_DIRTY = 1 << QCOW2_INCOMPAT_DIRTY_BITNR,
QCOW2_INCOMPAT_CORRUPT = 1 << QCOW2_INCOMPAT_CORRUPT_BITNR,
QCOW2_INCOMPAT_DATA_FILE = 1 << QCOW2_INCOMPAT_DATA_FILE_BITNR,
QCOW2_INCOMPAT_MASK = QCOW2_INCOMPAT_DIRTY
| QCOW2_INCOMPAT_CORRUPT,
QCOW2_INCOMPAT_MASK = QCOW2_INCOMPAT_DIRTY
| QCOW2_INCOMPAT_CORRUPT,
};
/* Compatible feature bits */
@ -216,10 +218,12 @@ enum {
/* Autoclear feature bits */
enum {
QCOW2_AUTOCLEAR_BITMAPS_BITNR = 0,
QCOW2_AUTOCLEAR_BITMAPS = 1 << QCOW2_AUTOCLEAR_BITMAPS_BITNR,
QCOW2_AUTOCLEAR_BITMAPS_BITNR = 0,
QCOW2_AUTOCLEAR_DATA_FILE_RAW_BITNR = 1,
QCOW2_AUTOCLEAR_BITMAPS = 1 << QCOW2_AUTOCLEAR_BITMAPS_BITNR,
QCOW2_AUTOCLEAR_DATA_FILE_RAW = 1 << QCOW2_AUTOCLEAR_DATA_FILE_RAW_BITNR,
QCOW2_AUTOCLEAR_MASK = QCOW2_AUTOCLEAR_BITMAPS,
QCOW2_AUTOCLEAR_MASK = QCOW2_AUTOCLEAR_BITMAPS,
};
enum qcow2_discard_type {
@ -340,6 +344,8 @@ typedef struct BDRVQcow2State {
CoQueue compress_wait_queue;
int nb_compress_threads;
BdrvChild *data_file;
} BDRVQcow2State;
typedef struct Qcow2COWRegion {
@ -457,6 +463,12 @@ typedef enum QCow2MetadataOverlap {
#define REFT_OFFSET_MASK 0xfffffffffffffe00ULL
static inline bool has_data_file(BlockDriverState *bs)
{
BDRVQcow2State *s = bs->opaque;
return (s->data_file != bs->file);
}
static inline int64_t start_of_cluster(BDRVQcow2State *s, int64_t offset)
{
return offset & ~(s->cluster_size - 1);

8
tests/qemu-iotests/031.out
View File

@ -117,7 +117,7 @@ header_length 104
Header extension:
magic 0x6803f857
length 144
length 192
data <binary>
Header extension:
@ -150,7 +150,7 @@ header_length 104
Header extension:
magic 0x6803f857
length 144
length 192
data <binary>
Header extension:
@ -164,7 +164,7 @@ No errors were found on the image.
magic 0x514649fb
version 3
backing_file_offset 0x148
backing_file_offset 0x178
backing_file_size 0x17
cluster_bits 16
size 67108864
@ -188,7 +188,7 @@ data 'host_device'
Header extension:
magic 0x6803f857
length 144
length 192
data <binary>
Header extension:

4
tests/qemu-iotests/036.out
View File

@ -58,7 +58,7 @@ header_length 104
Header extension:
magic 0x6803f857
length 144
length 192
data <binary>
@ -86,7 +86,7 @@ header_length 104
Header extension:
magic 0x6803f857
length 144
length 192
data <binary>
*** done

14
tests/qemu-iotests/061.out
View File

@ -26,7 +26,7 @@ header_length 104
Header extension:
magic 0x6803f857
length 144
length 192
data <binary>
magic 0x514649fb
@ -84,7 +84,7 @@ header_length 104
Header extension:
magic 0x6803f857
length 144
length 192
data <binary>
magic 0x514649fb
@ -144,7 +144,7 @@ header_length 104
Header extension:
magic 0x6803f857
length 144
length 192
data <binary>
ERROR cluster 5 refcount=0 reference=1
@ -199,7 +199,7 @@ header_length 104
Header extension:
magic 0x6803f857
length 144
length 192
data <binary>
magic 0x514649fb
@ -268,7 +268,7 @@ header_length 104
Header extension:
magic 0x6803f857
length 144
length 192
data <binary>
read 65536/65536 bytes at offset 44040192
@ -306,7 +306,7 @@ header_length 104
Header extension:
magic 0x6803f857
length 144
length 192
data <binary>
ERROR cluster 5 refcount=0 reference=1
@ -335,7 +335,7 @@ header_length 104
Header extension:
magic 0x6803f857
length 144
length 192
data <binary>
read 131072/131072 bytes at offset 0