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([10.28.8.145]) by relay.sw.ru (8.13.4/8.13.4) with ESMTP id u77NfZcH001857; Mon, 8 Aug 2016 02:41:36 +0300 (MSK) From: Vladimir Sementsov-Ogievskiy To: qemu-block@nongnu.org, qemu-devel@nongnu.org Date: Mon, 8 Aug 2016 18:04:56 +0300 Message-Id: <1470668720-211300-6-git-send-email-vsementsov@virtuozzo.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1470668720-211300-1-git-send-email-vsementsov@virtuozzo.com> References: <1470668720-211300-1-git-send-email-vsementsov@virtuozzo.com> X-detected-operating-system: by eggs.gnu.org: OpenBSD 3.x X-Received-From: 195.214.232.25 Subject: [Qemu-devel] [PATCH 05/29] qcow2-bitmap: structs and consts X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, vsementsov@virtuozzo.com, famz@redhat.com, armbru@redhat.com, mreitz@redhat.com, stefanha@redhat.com, pbonzini@redhat.com, den@openvz.org, jsnow@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Create block/qcow2-bitmap.c Add data structures and constraints accordingly to docs/specs/qcow2.txt Signed-off-by: Vladimir Sementsov-Ogievskiy --- block/Makefile.objs | 2 +- block/qcow2-bitmap.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ block/qcow2.h | 29 +++++++++++++++++++++++++++++ 3 files changed, 77 insertions(+), 1 deletion(-) create mode 100644 block/qcow2-bitmap.c diff --git a/block/Makefile.objs b/block/Makefile.objs index 2593a2f..545d618 100644 --- a/block/Makefile.objs +++ b/block/Makefile.objs @@ -1,5 +1,5 @@ block-obj-y += raw_bsd.o qcow.o vdi.o vmdk.o cloop.o bochs.o vpc.o vvfat.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-gencb.o qed-l2-cache.o qed-table.o qed-cluster.o block-obj-y += qed-check.o block-obj-$(CONFIG_VHDX) += vhdx.o vhdx-endian.o vhdx-log.o diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c new file mode 100644 index 0000000..cd18b07 --- /dev/null +++ b/block/qcow2-bitmap.c @@ -0,0 +1,47 @@ +/* + * Bitmaps for the QCOW version 2 format + * + * Copyright (c) 2014-2016 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. + */ + +/* 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 /* 512 mb */ +#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 0xffffffff + +/* bits [1, 8] U [56, 63] are reserved */ +#define BME_TABLE_ENTRY_RESERVED_MASK 0xff000000000001fe + +typedef enum BitmapType { + BT_DIRTY_TRACKING_BITMAP = 1 +} BitmapType; diff --git a/block/qcow2.h b/block/qcow2.h index b36a7bf..b12cecc 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -52,6 +52,10 @@ * space for snapshot names and IDs */ #define QCOW_MAX_SNAPSHOTS_SIZE (1024 * QCOW_MAX_SNAPSHOTS) +/* Bitmap header extension constraints */ +#define QCOW_MAX_DIRTY_BITMAPS 65535 +#define QCOW_MAX_DIRTY_BITMAP_DIRECTORY_SIZE (1024 * QCOW_MAX_DIRTY_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) */ @@ -142,6 +146,22 @@ typedef struct QEMU_PACKED QCowSnapshotHeader { /* name follows */ } QCowSnapshotHeader; +/* QCow2BitmapHeader is actually a bitmap directory entry */ +typedef struct QEMU_PACKED QCow2BitmapHeader { + /* 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 */ +} QCow2BitmapHeader; + typedef struct QEMU_PACKED QCowSnapshotExtraData { uint64_t vm_state_size_large; uint64_t disk_size; @@ -222,6 +242,15 @@ typedef uint64_t Qcow2GetRefcountFunc(const void *refcount_array, typedef void Qcow2SetRefcountFunc(void *refcount_array, uint64_t index, uint64_t value); +/* Be careful, Qcow2BitmapHeaderExt is not an extension of QCow2BitmapHeader, it + * is Qcow2 header extension */ +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;