mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-11-05 20:35:44 +00:00
qcow2: add bitmaps extension
Add bitmap extension as specified in docs/specs/qcow2.txt. For now, just mirror extension header into Qcow2 state and check constraints. Also, calculate refcounts for qcow2 bitmaps, to not break qemu-img check. For now, disable image resize if it has bitmaps. It will be fixed later. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com> Message-id: 20170628120530.31251-9-vsementsov@virtuozzo.com Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy
Max Reitz
parent
8a5bb1f114
commit
88ddffae8f
5 changed files with 593 additions and 6 deletions
|
|
@ -1,5 +1,5 @@
|
|||
block-obj-y += raw-format.o qcow.o vdi.o vmdk.o cloop.o bochs.o vpc.o vvfat.o dmg.o
|
||||
block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o qcow2-cache.o
|
||||
block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o qcow2-cache.o qcow2-bitmap.o
|
||||
block-obj-y += qed.o qed-l2-cache.o qed-table.o qed-cluster.o
|
||||
block-obj-y += qed-check.o
|
||||
block-obj-y += vhdx.o vhdx-endian.o vhdx-log.o
|
||||
|
|
|
|||
439
block/qcow2-bitmap.c
Normal file
439
block/qcow2-bitmap.c
Normal file
|
|
@ -0,0 +1,439 @@
|
|||
/*
|
||||
* Bitmaps for the QCOW version 2 format
|
||||
*
|
||||
* Copyright (c) 2014-2017 Vladimir Sementsov-Ogievskiy
|
||||
*
|
||||
* This file is derived from qcow2-snapshot.c, original copyright:
|
||||
* Copyright (c) 2004-2006 Fabrice Bellard
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
||||
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
|
||||
#include "qemu/osdep.h"
|
||||
#include "qapi/error.h"
|
||||
|
||||
#include "block/block_int.h"
|
||||
#include "block/qcow2.h"
|
||||
|
||||
/* NOTICE: BME here means Bitmaps Extension and used as a namespace for
|
||||
* _internal_ constants. Please do not use this _internal_ abbreviation for
|
||||
* other needs and/or outside of this file. */
|
||||
|
||||
/* Bitmap directory entry constraints */
|
||||
#define BME_MAX_TABLE_SIZE 0x8000000
|
||||
#define BME_MAX_PHYS_SIZE 0x20000000 /* restrict BdrvDirtyBitmap size in RAM */
|
||||
#define BME_MAX_GRANULARITY_BITS 31
|
||||
#define BME_MIN_GRANULARITY_BITS 9
|
||||
#define BME_MAX_NAME_SIZE 1023
|
||||
|
||||
/* Bitmap directory entry flags */
|
||||
#define BME_RESERVED_FLAGS 0xfffffffcU
|
||||
|
||||
/* bits [1, 8] U [56, 63] are reserved */
|
||||
#define BME_TABLE_ENTRY_RESERVED_MASK 0xff000000000001feULL
|
||||
#define BME_TABLE_ENTRY_OFFSET_MASK 0x00fffffffffffe00ULL
|
||||
#define BME_TABLE_ENTRY_FLAG_ALL_ONES (1ULL << 0)
|
||||
|
||||
typedef struct QEMU_PACKED Qcow2BitmapDirEntry {
|
||||
/* header is 8 byte aligned */
|
||||
uint64_t bitmap_table_offset;
|
||||
|
||||
uint32_t bitmap_table_size;
|
||||
uint32_t flags;
|
||||
|
||||
uint8_t type;
|
||||
uint8_t granularity_bits;
|
||||
uint16_t name_size;
|
||||
uint32_t extra_data_size;
|
||||
/* extra data follows */
|
||||
/* name follows */
|
||||
} Qcow2BitmapDirEntry;
|
||||
|
||||
typedef struct Qcow2BitmapTable {
|
||||
uint64_t offset;
|
||||
uint32_t size; /* number of 64bit entries */
|
||||
QSIMPLEQ_ENTRY(Qcow2BitmapTable) entry;
|
||||
} Qcow2BitmapTable;
|
||||
|
||||
typedef struct Qcow2Bitmap {
|
||||
Qcow2BitmapTable table;
|
||||
uint32_t flags;
|
||||
uint8_t granularity_bits;
|
||||
char *name;
|
||||
|
||||
QSIMPLEQ_ENTRY(Qcow2Bitmap) entry;
|
||||
} Qcow2Bitmap;
|
||||
typedef QSIMPLEQ_HEAD(Qcow2BitmapList, Qcow2Bitmap) Qcow2BitmapList;
|
||||
|
||||
typedef enum BitmapType {
|
||||
BT_DIRTY_TRACKING_BITMAP = 1
|
||||
} BitmapType;
|
||||
|
||||
static int check_table_entry(uint64_t entry, int cluster_size)
|
||||
{
|
||||
uint64_t offset;
|
||||
|
||||
if (entry & BME_TABLE_ENTRY_RESERVED_MASK) {
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
offset = entry & BME_TABLE_ENTRY_OFFSET_MASK;
|
||||
if (offset != 0) {
|
||||
/* if offset specified, bit 0 is reserved */
|
||||
if (entry & BME_TABLE_ENTRY_FLAG_ALL_ONES) {
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (offset % cluster_size != 0) {
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bitmap_table_load(BlockDriverState *bs, Qcow2BitmapTable *tb,
|
||||
uint64_t **bitmap_table)
|
||||
{
|
||||
int ret;
|
||||
BDRVQcow2State *s = bs->opaque;
|
||||
uint32_t i;
|
||||
uint64_t *table;
|
||||
|
||||
assert(tb->size != 0);
|
||||
table = g_try_new(uint64_t, tb->size);
|
||||
if (table == NULL) {
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
assert(tb->size <= BME_MAX_TABLE_SIZE);
|
||||
ret = bdrv_pread(bs->file, tb->offset,
|
||||
table, tb->size * sizeof(uint64_t));
|
||||
if (ret < 0) {
|
||||
goto fail;
|
||||
}
|
||||
|
||||
for (i = 0; i < tb->size; ++i) {
|
||||
be64_to_cpus(&table[i]);
|
||||
ret = check_table_entry(table[i], s->cluster_size);
|
||||
if (ret < 0) {
|
||||
goto fail;
|
||||
}
|
||||
}
|
||||
|
||||
*bitmap_table = table;
|
||||
return 0;
|
||||
|
||||
fail:
|
||||
g_free(table);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Bitmap List
|
||||
*/
|
||||
|
||||
/*
|
||||
* Bitmap List private functions
|
||||
* Only Bitmap List knows about bitmap directory structure in Qcow2.
|
||||
*/
|
||||
|
||||
static inline void bitmap_dir_entry_to_cpu(Qcow2BitmapDirEntry *entry)
|
||||
{
|
||||
be64_to_cpus(&entry->bitmap_table_offset);
|
||||
be32_to_cpus(&entry->bitmap_table_size);
|
||||
be32_to_cpus(&entry->flags);
|
||||
be16_to_cpus(&entry->name_size);
|
||||
be32_to_cpus(&entry->extra_data_size);
|
||||
}
|
||||
|
||||
static inline int calc_dir_entry_size(size_t name_size, size_t extra_data_size)
|
||||
{
|
||||
return align_offset(sizeof(Qcow2BitmapDirEntry) +
|
||||
name_size + extra_data_size, 8);
|
||||
}
|
||||
|
||||
static inline int dir_entry_size(Qcow2BitmapDirEntry *entry)
|
||||
{
|
||||
return calc_dir_entry_size(entry->name_size, entry->extra_data_size);
|
||||
}
|
||||
|
||||
static inline const char *dir_entry_name_field(Qcow2BitmapDirEntry *entry)
|
||||
{
|
||||
return (const char *)(entry + 1) + entry->extra_data_size;
|
||||
}
|
||||
|
||||
static inline char *dir_entry_copy_name(Qcow2BitmapDirEntry *entry)
|
||||
{
|
||||
const char *name_field = dir_entry_name_field(entry);
|
||||
return g_strndup(name_field, entry->name_size);
|
||||
}
|
||||
|
||||
static inline Qcow2BitmapDirEntry *next_dir_entry(Qcow2BitmapDirEntry *entry)
|
||||
{
|
||||
return (Qcow2BitmapDirEntry *)((uint8_t *)entry + dir_entry_size(entry));
|
||||
}
|
||||
|
||||
static int check_dir_entry(BlockDriverState *bs, Qcow2BitmapDirEntry *entry)
|
||||
{
|
||||
BDRVQcow2State *s = bs->opaque;
|
||||
uint64_t phys_bitmap_bytes;
|
||||
int64_t len;
|
||||
|
||||
bool fail = (entry->bitmap_table_size == 0) ||
|
||||
(entry->bitmap_table_offset == 0) ||
|
||||
(entry->bitmap_table_offset % s->cluster_size) ||
|
||||
(entry->bitmap_table_size > BME_MAX_TABLE_SIZE) ||
|
||||
(entry->granularity_bits > BME_MAX_GRANULARITY_BITS) ||
|
||||
(entry->granularity_bits < BME_MIN_GRANULARITY_BITS) ||
|
||||
(entry->flags & BME_RESERVED_FLAGS) ||
|
||||
(entry->name_size > BME_MAX_NAME_SIZE) ||
|
||||
(entry->type != BT_DIRTY_TRACKING_BITMAP);
|
||||
|
||||
if (fail) {
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
phys_bitmap_bytes = (uint64_t)entry->bitmap_table_size * s->cluster_size;
|
||||
len = bdrv_getlength(bs);
|
||||
|
||||
if (len < 0) {
|
||||
return len;
|
||||
}
|
||||
|
||||
fail = (phys_bitmap_bytes > BME_MAX_PHYS_SIZE) ||
|
||||
(len > ((phys_bitmap_bytes * 8) << entry->granularity_bits));
|
||||
|
||||
return fail ? -EINVAL : 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Bitmap List public functions
|
||||
*/
|
||||
|
||||
static void bitmap_free(Qcow2Bitmap *bm)
|
||||
{
|
||||
g_free(bm->name);
|
||||
g_free(bm);
|
||||
}
|
||||
|
||||
static void bitmap_list_free(Qcow2BitmapList *bm_list)
|
||||
{
|
||||
Qcow2Bitmap *bm;
|
||||
|
||||
if (bm_list == NULL) {
|
||||
return;
|
||||
}
|
||||
|
||||
while ((bm = QSIMPLEQ_FIRST(bm_list)) != NULL) {
|
||||
QSIMPLEQ_REMOVE_HEAD(bm_list, entry);
|
||||
bitmap_free(bm);
|
||||
}
|
||||
|
||||
g_free(bm_list);
|
||||
}
|
||||
|
||||
static Qcow2BitmapList *bitmap_list_new(void)
|
||||
{
|
||||
Qcow2BitmapList *bm_list = g_new(Qcow2BitmapList, 1);
|
||||
QSIMPLEQ_INIT(bm_list);
|
||||
|
||||
return bm_list;
|
||||
}
|
||||
|
||||
/* bitmap_list_load
|
||||
* Get bitmap list from qcow2 image. Actually reads bitmap directory,
|
||||
* checks it and convert to bitmap list.
|
||||
*/
|
||||
static Qcow2BitmapList *bitmap_list_load(BlockDriverState *bs, uint64_t offset,
|
||||
uint64_t size, Error **errp)
|
||||
{
|
||||
int ret;
|
||||
BDRVQcow2State *s = bs->opaque;
|
||||
uint8_t *dir, *dir_end;
|
||||
Qcow2BitmapDirEntry *e;
|
||||
uint32_t nb_dir_entries = 0;
|
||||
Qcow2BitmapList *bm_list = NULL;
|
||||
|
||||
if (size == 0) {
|
||||
error_setg(errp, "Requested bitmap directory size is zero");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (size > QCOW2_MAX_BITMAP_DIRECTORY_SIZE) {
|
||||
error_setg(errp, "Requested bitmap directory size is too big");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
dir = g_try_malloc(size);
|
||||
if (dir == NULL) {
|
||||
error_setg(errp, "Failed to allocate space for bitmap directory");
|
||||
return NULL;
|
||||
}
|
||||
dir_end = dir + size;
|
||||
|
||||
ret = bdrv_pread(bs->file, offset, dir, size);
|
||||
if (ret < 0) {
|
||||
error_setg_errno(errp, -ret, "Failed to read bitmap directory");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
bm_list = bitmap_list_new();
|
||||
for (e = (Qcow2BitmapDirEntry *)dir;
|
||||
e < (Qcow2BitmapDirEntry *)dir_end;
|
||||
e = next_dir_entry(e))
|
||||
{
|
||||
Qcow2Bitmap *bm;
|
||||
|
||||
if ((uint8_t *)(e + 1) > dir_end) {
|
||||
goto broken_dir;
|
||||
}
|
||||
|
||||
if (++nb_dir_entries > s->nb_bitmaps) {
|
||||
error_setg(errp, "More bitmaps found than specified in header"
|
||||
" extension");
|
||||
goto fail;
|
||||
}
|
||||
bitmap_dir_entry_to_cpu(e);
|
||||
|
||||
if ((uint8_t *)next_dir_entry(e) > dir_end) {
|
||||
goto broken_dir;
|
||||
}
|
||||
|
||||
if (e->extra_data_size != 0) {
|
||||
error_setg(errp, "Bitmap extra data is not supported");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
ret = check_dir_entry(bs, e);
|
||||
if (ret < 0) {
|
||||
error_setg(errp, "Bitmap '%.*s' doesn't satisfy the constraints",
|
||||
e->name_size, dir_entry_name_field(e));
|
||||
goto fail;
|
||||
}
|
||||
|
||||
bm = g_new(Qcow2Bitmap, 1);
|
||||
bm->table.offset = e->bitmap_table_offset;
|
||||
bm->table.size = e->bitmap_table_size;
|
||||
bm->flags = e->flags;
|
||||
bm->granularity_bits = e->granularity_bits;
|
||||
bm->name = dir_entry_copy_name(e);
|
||||
QSIMPLEQ_INSERT_TAIL(bm_list, bm, entry);
|
||||
}
|
||||
|
||||
if (nb_dir_entries != s->nb_bitmaps) {
|
||||
error_setg(errp, "Less bitmaps found than specified in header"
|
||||
" extension");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
if ((uint8_t *)e != dir_end) {
|
||||
goto broken_dir;
|
||||
}
|
||||
|
||||
g_free(dir);
|
||||
return bm_list;
|
||||
|
||||
broken_dir:
|
||||
ret = -EINVAL;
|
||||
error_setg(errp, "Broken bitmap directory");
|
||||
|
||||
fail:
|
||||
g_free(dir);
|
||||
bitmap_list_free(bm_list);
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
int qcow2_check_bitmaps_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
|
||||
void **refcount_table,
|
||||
int64_t *refcount_table_size)
|
||||
{
|
||||
int ret;
|
||||
BDRVQcow2State *s = bs->opaque;
|
||||
Qcow2BitmapList *bm_list;
|
||||
Qcow2Bitmap *bm;
|
||||
|
||||
if (s->nb_bitmaps == 0) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
ret = qcow2_inc_refcounts_imrt(bs, res, refcount_table, refcount_table_size,
|
||||
s->bitmap_directory_offset,
|
||||
s->bitmap_directory_size);
|
||||
if (ret < 0) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
bm_list = bitmap_list_load(bs, s->bitmap_directory_offset,
|
||||
s->bitmap_directory_size, NULL);
|
||||
if (bm_list == NULL) {
|
||||
res->corruptions++;
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
QSIMPLEQ_FOREACH(bm, bm_list, entry) {
|
||||
uint64_t *bitmap_table = NULL;
|
||||
int i;
|
||||
|
||||
ret = qcow2_inc_refcounts_imrt(bs, res,
|
||||
refcount_table, refcount_table_size,
|
||||
bm->table.offset,
|
||||
bm->table.size * sizeof(uint64_t));
|
||||
if (ret < 0) {
|
||||
goto out;
|
||||
}
|
||||
|
||||
ret = bitmap_table_load(bs, &bm->table, &bitmap_table);
|
||||
if (ret < 0) {
|
||||
res->corruptions++;
|
||||
goto out;
|
||||
}
|
||||
|
||||
for (i = 0; i < bm->table.size; ++i) {
|
||||
uint64_t entry = bitmap_table[i];
|
||||
uint64_t offset = entry & BME_TABLE_ENTRY_OFFSET_MASK;
|
||||
|
||||
if (check_table_entry(entry, s->cluster_size) < 0) {
|
||||
res->corruptions++;
|
||||
continue;
|
||||
}
|
||||
|
||||
if (offset == 0) {
|
||||
continue;
|
||||
}
|
||||
|
||||
ret = qcow2_inc_refcounts_imrt(bs, res,
|
||||
refcount_table, refcount_table_size,
|
||||
offset, s->cluster_size);
|
||||
if (ret < 0) {
|
||||
g_free(bitmap_table);
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
g_free(bitmap_table);
|
||||
}
|
||||
|
||||
out:
|
||||
bitmap_list_free(bm_list);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
|
@ -1869,6 +1869,12 @@ static int calculate_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
|
|||
}
|
||||
}
|
||||
|
||||
/* bitmaps */
|
||||
ret = qcow2_check_bitmaps_refcounts(bs, res, refcount_table, nb_clusters);
|
||||
if (ret < 0) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
return check_refblocks(bs, res, fix, rebuild, refcount_table, nb_clusters);
|
||||
}
|
||||
|
||||
|
|
|
|||
125
block/qcow2.c
125
block/qcow2.c
|
|
@ -67,6 +67,7 @@ typedef struct {
|
|||
#define QCOW2_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA
|
||||
#define QCOW2_EXT_MAGIC_FEATURE_TABLE 0x6803f857
|
||||
#define QCOW2_EXT_MAGIC_CRYPTO_HEADER 0x0537be77
|
||||
#define QCOW2_EXT_MAGIC_BITMAPS 0x23852875
|
||||
|
||||
static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename)
|
||||
{
|
||||
|
|
@ -170,12 +171,18 @@ static ssize_t qcow2_crypto_hdr_write_func(QCryptoBlock *block, size_t offset,
|
|||
*/
|
||||
static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
|
||||
uint64_t end_offset, void **p_feature_table,
|
||||
int flags, Error **errp)
|
||||
int flags, bool *need_update_header,
|
||||
Error **errp)
|
||||
{
|
||||
BDRVQcow2State *s = bs->opaque;
|
||||
QCowExtension ext;
|
||||
uint64_t offset;
|
||||
int ret;
|
||||
Qcow2BitmapHeaderExt bitmaps_ext;
|
||||
|
||||
if (need_update_header != NULL) {
|
||||
*need_update_header = false;
|
||||
}
|
||||
|
||||
#ifdef DEBUG_EXT
|
||||
printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset);
|
||||
|
|
@ -287,6 +294,85 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
|
|||
}
|
||||
} break;
|
||||
|
||||
case QCOW2_EXT_MAGIC_BITMAPS:
|
||||
if (ext.len != sizeof(bitmaps_ext)) {
|
||||
error_setg_errno(errp, -ret, "bitmaps_ext: "
|
||||
"Invalid extension length");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (!(s->autoclear_features & QCOW2_AUTOCLEAR_BITMAPS)) {
|
||||
error_report("WARNING: a program lacking bitmap support "
|
||||
"modified this file, so all bitmaps are now "
|
||||
"considered inconsistent. Some clusters may be "
|
||||
"leaked, run 'qemu-img check -r' on the image "
|
||||
"file to fix.");
|
||||
if (need_update_header != NULL) {
|
||||
/* Updating is needed to drop invalid bitmap extension. */
|
||||
*need_update_header = true;
|
||||
}
|
||||
break;
|
||||
}
|
||||
|
||||
ret = bdrv_pread(bs->file, offset, &bitmaps_ext, ext.len);
|
||||
if (ret < 0) {
|
||||
error_setg_errno(errp, -ret, "bitmaps_ext: "
|
||||
"Could not read ext header");
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (bitmaps_ext.reserved32 != 0) {
|
||||
error_setg_errno(errp, -ret, "bitmaps_ext: "
|
||||
"Reserved field is not zero");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
be32_to_cpus(&bitmaps_ext.nb_bitmaps);
|
||||
be64_to_cpus(&bitmaps_ext.bitmap_directory_size);
|
||||
be64_to_cpus(&bitmaps_ext.bitmap_directory_offset);
|
||||
|
||||
if (bitmaps_ext.nb_bitmaps > QCOW2_MAX_BITMAPS) {
|
||||
error_setg(errp,
|
||||
"bitmaps_ext: Image has %" PRIu32 " bitmaps, "
|
||||
"exceeding the QEMU supported maximum of %d",
|
||||
bitmaps_ext.nb_bitmaps, QCOW2_MAX_BITMAPS);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (bitmaps_ext.nb_bitmaps == 0) {
|
||||
error_setg(errp, "found bitmaps extension with zero bitmaps");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (bitmaps_ext.bitmap_directory_offset & (s->cluster_size - 1)) {
|
||||
error_setg(errp, "bitmaps_ext: "
|
||||
"invalid bitmap directory offset");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (bitmaps_ext.bitmap_directory_size >
|
||||
QCOW2_MAX_BITMAP_DIRECTORY_SIZE) {
|
||||
error_setg(errp, "bitmaps_ext: "
|
||||
"bitmap directory size (%" PRIu64 ") exceeds "
|
||||
"the maximum supported size (%d)",
|
||||
bitmaps_ext.bitmap_directory_size,
|
||||
QCOW2_MAX_BITMAP_DIRECTORY_SIZE);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
s->nb_bitmaps = bitmaps_ext.nb_bitmaps;
|
||||
s->bitmap_directory_offset =
|
||||
bitmaps_ext.bitmap_directory_offset;
|
||||
s->bitmap_directory_size =
|
||||
bitmaps_ext.bitmap_directory_size;
|
||||
|
||||
#ifdef DEBUG_EXT
|
||||
printf("Qcow2: Got bitmaps extension: "
|
||||
"offset=%" PRIu64 " nb_bitmaps=%" PRIu32 "\n",
|
||||
s->bitmap_directory_offset, s->nb_bitmaps);
|
||||
#endif
|
||||
break;
|
||||
|
||||
default:
|
||||
/* unknown magic - save it in case we need to rewrite the header */
|
||||
{
|
||||
|
|
@ -1008,6 +1094,7 @@ static int qcow2_do_open(BlockDriverState *bs, QDict *options, int flags,
|
|||
Error *local_err = NULL;
|
||||
uint64_t ext_end;
|
||||
uint64_t l1_vm_state_index;
|
||||
bool update_header = false;
|
||||
|
||||
ret = bdrv_pread(bs->file, 0, &header, sizeof(header));
|
||||
if (ret < 0) {
|
||||
|
|
@ -1113,7 +1200,7 @@ static int qcow2_do_open(BlockDriverState *bs, QDict *options, int flags,
|
|||
if (s->incompatible_features & ~QCOW2_INCOMPAT_MASK) {
|
||||
void *feature_table = NULL;
|
||||
qcow2_read_extensions(bs, header.header_length, ext_end,
|
||||
&feature_table, flags, NULL);
|
||||
&feature_table, flags, NULL, NULL);
|
||||
report_unsupported_feature(errp, feature_table,
|
||||
s->incompatible_features &
|
||||
~QCOW2_INCOMPAT_MASK);
|
||||
|
|
@ -1297,7 +1384,7 @@ static int qcow2_do_open(BlockDriverState *bs, QDict *options, int flags,
|
|||
|
||||
/* read qcow2 extensions */
|
||||
if (qcow2_read_extensions(bs, header.header_length, ext_end, NULL,
|
||||
flags, &local_err)) {
|
||||
flags, &update_header, &local_err)) {
|
||||
error_propagate(errp, local_err);
|
||||
ret = -EINVAL;
|
||||
goto fail;
|
||||
|
|
@ -1357,8 +1444,10 @@ static int qcow2_do_open(BlockDriverState *bs, QDict *options, int flags,
|
|||
}
|
||||
|
||||
/* Clear unknown autoclear feature bits */
|
||||
if (!bs->read_only && !(flags & BDRV_O_INACTIVE) && s->autoclear_features) {
|
||||
s->autoclear_features = 0;
|
||||
update_header |= s->autoclear_features & ~QCOW2_AUTOCLEAR_MASK;
|
||||
|
||||
if (update_header && !bs->read_only && !(flags & BDRV_O_INACTIVE)) {
|
||||
s->autoclear_features &= QCOW2_AUTOCLEAR_MASK;
|
||||
ret = qcow2_update_header(bs);
|
||||
if (ret < 0) {
|
||||
error_setg_errno(errp, -ret, "Could not update qcow2 header");
|
||||
|
|
@ -2203,6 +2292,25 @@ int qcow2_update_header(BlockDriverState *bs)
|
|||
buflen -= ret;
|
||||
}
|
||||
|
||||
/* Bitmap extension */
|
||||
if (s->nb_bitmaps > 0) {
|
||||
Qcow2BitmapHeaderExt bitmaps_header = {
|
||||
.nb_bitmaps = cpu_to_be32(s->nb_bitmaps),
|
||||
.bitmap_directory_size =
|
||||
cpu_to_be64(s->bitmap_directory_size),
|
||||
.bitmap_directory_offset =
|
||||
cpu_to_be64(s->bitmap_directory_offset)
|
||||
};
|
||||
ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BITMAPS,
|
||||
&bitmaps_header, sizeof(bitmaps_header),
|
||||
buflen);
|
||||
if (ret < 0) {
|
||||
goto fail;
|
||||
}
|
||||
buf += ret;
|
||||
buflen -= ret;
|
||||
}
|
||||
|
||||
/* Keep unknown header extensions */
|
||||
QLIST_FOREACH(uext, &s->unknown_header_ext, next) {
|
||||
ret = header_ext_add(buf, uext->magic, uext->data, uext->len, buflen);
|
||||
|
|
@ -2884,6 +2992,13 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
|
|||
return -ENOTSUP;
|
||||
}
|
||||
|
||||
/* cannot proceed if image has bitmaps */
|
||||
if (s->nb_bitmaps) {
|
||||
/* TODO: resize bitmaps in the image */
|
||||
error_setg(errp, "Can't resize an image which has bitmaps");
|
||||
return -ENOTSUP;
|
||||
}
|
||||
|
||||
/* shrinking is currently not supported */
|
||||
if (offset < bs->total_sectors * 512) {
|
||||
error_setg(errp, "qcow2 doesn't support shrinking images yet");
|
||||
|
|
|
|||
|
|
@ -53,6 +53,10 @@
|
|||
* space for snapshot names and IDs */
|
||||
#define QCOW_MAX_SNAPSHOTS_SIZE (1024 * QCOW_MAX_SNAPSHOTS)
|
||||
|
||||
/* Bitmap header extension constraints */
|
||||
#define QCOW2_MAX_BITMAPS 65535
|
||||
#define QCOW2_MAX_BITMAP_DIRECTORY_SIZE (1024 * QCOW2_MAX_BITMAPS)
|
||||
|
||||
/* indicate that the refcount of the referenced cluster is exactly one. */
|
||||
#define QCOW_OFLAG_COPIED (1ULL << 63)
|
||||
/* indicate that the cluster is compressed (they never have the copied flag) */
|
||||
|
|
@ -201,6 +205,14 @@ enum {
|
|||
QCOW2_COMPAT_FEAT_MASK = QCOW2_COMPAT_LAZY_REFCOUNTS,
|
||||
};
|
||||
|
||||
/* Autoclear feature bits */
|
||||
enum {
|
||||
QCOW2_AUTOCLEAR_BITMAPS_BITNR = 0,
|
||||
QCOW2_AUTOCLEAR_BITMAPS = 1 << QCOW2_AUTOCLEAR_BITMAPS_BITNR,
|
||||
|
||||
QCOW2_AUTOCLEAR_MASK = QCOW2_AUTOCLEAR_BITMAPS,
|
||||
};
|
||||
|
||||
enum qcow2_discard_type {
|
||||
QCOW2_DISCARD_NEVER = 0,
|
||||
QCOW2_DISCARD_ALWAYS,
|
||||
|
|
@ -228,6 +240,13 @@ typedef uint64_t Qcow2GetRefcountFunc(const void *refcount_array,
|
|||
typedef void Qcow2SetRefcountFunc(void *refcount_array,
|
||||
uint64_t index, uint64_t value);
|
||||
|
||||
typedef struct Qcow2BitmapHeaderExt {
|
||||
uint32_t nb_bitmaps;
|
||||
uint32_t reserved32;
|
||||
uint64_t bitmap_directory_size;
|
||||
uint64_t bitmap_directory_offset;
|
||||
} QEMU_PACKED Qcow2BitmapHeaderExt;
|
||||
|
||||
typedef struct BDRVQcow2State {
|
||||
int cluster_bits;
|
||||
int cluster_size;
|
||||
|
|
@ -274,6 +293,10 @@ typedef struct BDRVQcow2State {
|
|||
unsigned int nb_snapshots;
|
||||
QCowSnapshot *snapshots;
|
||||
|
||||
uint32_t nb_bitmaps;
|
||||
uint64_t bitmap_directory_size;
|
||||
uint64_t bitmap_directory_offset;
|
||||
|
||||
int flags;
|
||||
int qcow_version;
|
||||
bool use_lazy_refcounts;
|
||||
|
|
@ -618,4 +641,8 @@ int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
|
|||
void **table);
|
||||
void qcow2_cache_put(BlockDriverState *bs, Qcow2Cache *c, void **table);
|
||||
|
||||
/* qcow2-bitmap.c functions */
|
||||
int qcow2_check_bitmaps_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
|
||||
void **refcount_table,
|
||||
int64_t *refcount_table_size);
|
||||
#endif
|
||||
|
|
|
|||
Loading…
Reference in a new issue