From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42700) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1expp3-0006hy-IA for qemu-devel@nongnu.org; Mon, 19 Mar 2018 04:07:14 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1expp0-0005lt-Al for qemu-devel@nongnu.org; Mon, 19 Mar 2018 04:07:13 -0400 From: Vladimir Sementsov-Ogievskiy Date: Mon, 19 Mar 2018 11:07:05 +0300 Message-Id: <20180319080705.10310-1-vsementsov@virtuozzo.com> Subject: [Qemu-devel] [PATCH v2] qcow2: add overlap check for bitmap directory List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, qemu-block@nongnu.org Cc: mreitz@redhat.com, kwolf@redhat.com, jsnow@redhat.com, eblake@redhat.com Signed-off-by: Vladimir Sementsov-Ogievskiy --- If it appropriate for 2.12, let's push it. If not - then for 2.13. v2: - squash 02 (indentation fix) to 01 - drop comment from qcow2_check_metadata_overlap() - set @ign to QCOW2_OL_BITMAP_DIRECTORY for in-place case in bitmap_list_store. I don't think non-inplace case should be changed, as it don't touch active bitmap directory. block/qcow2.h | 45 ++++++++++++++++++++++++--------------------- block/qcow2-bitmap.c | 7 ++++++- block/qcow2-refcount.c | 10 ++++++++++ block/qcow2.c | 22 ++++++++++++++-------- 4 files changed, 54 insertions(+), 30 deletions(-) diff --git a/block/qcow2.h b/block/qcow2.h index 6f0ff15dd0..896ad08e5b 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -98,6 +98,7 @@ #define QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE "overlap-check.snapshot-table" #define QCOW2_OPT_OVERLAP_INACTIVE_L1 "overlap-check.inactive-l1" #define QCOW2_OPT_OVERLAP_INACTIVE_L2 "overlap-check.inactive-l2" +#define QCOW2_OPT_OVERLAP_BITMAP_DIRECTORY "overlap-check.bitmap-directory" #define QCOW2_OPT_CACHE_SIZE "cache-size" #define QCOW2_OPT_L2_CACHE_SIZE "l2-cache-size" #define QCOW2_OPT_REFCOUNT_CACHE_SIZE "refcount-cache-size" @@ -398,34 +399,36 @@ typedef enum QCow2ClusterType { } QCow2ClusterType; typedef enum QCow2MetadataOverlap { - QCOW2_OL_MAIN_HEADER_BITNR = 0, - QCOW2_OL_ACTIVE_L1_BITNR = 1, - QCOW2_OL_ACTIVE_L2_BITNR = 2, - QCOW2_OL_REFCOUNT_TABLE_BITNR = 3, - QCOW2_OL_REFCOUNT_BLOCK_BITNR = 4, - QCOW2_OL_SNAPSHOT_TABLE_BITNR = 5, - QCOW2_OL_INACTIVE_L1_BITNR = 6, - QCOW2_OL_INACTIVE_L2_BITNR = 7, - - QCOW2_OL_MAX_BITNR = 8, - - QCOW2_OL_NONE = 0, - QCOW2_OL_MAIN_HEADER = (1 << QCOW2_OL_MAIN_HEADER_BITNR), - QCOW2_OL_ACTIVE_L1 = (1 << QCOW2_OL_ACTIVE_L1_BITNR), - QCOW2_OL_ACTIVE_L2 = (1 << QCOW2_OL_ACTIVE_L2_BITNR), - QCOW2_OL_REFCOUNT_TABLE = (1 << QCOW2_OL_REFCOUNT_TABLE_BITNR), - QCOW2_OL_REFCOUNT_BLOCK = (1 << QCOW2_OL_REFCOUNT_BLOCK_BITNR), - QCOW2_OL_SNAPSHOT_TABLE = (1 << QCOW2_OL_SNAPSHOT_TABLE_BITNR), - QCOW2_OL_INACTIVE_L1 = (1 << QCOW2_OL_INACTIVE_L1_BITNR), + QCOW2_OL_MAIN_HEADER_BITNR = 0, + QCOW2_OL_ACTIVE_L1_BITNR = 1, + QCOW2_OL_ACTIVE_L2_BITNR = 2, + QCOW2_OL_REFCOUNT_TABLE_BITNR = 3, + QCOW2_OL_REFCOUNT_BLOCK_BITNR = 4, + QCOW2_OL_SNAPSHOT_TABLE_BITNR = 5, + QCOW2_OL_INACTIVE_L1_BITNR = 6, + QCOW2_OL_INACTIVE_L2_BITNR = 7, + QCOW2_OL_BITMAP_DIRECTORY_BITNR = 8, + + QCOW2_OL_MAX_BITNR = 9, + + QCOW2_OL_NONE = 0, + QCOW2_OL_MAIN_HEADER = (1 << QCOW2_OL_MAIN_HEADER_BITNR), + QCOW2_OL_ACTIVE_L1 = (1 << QCOW2_OL_ACTIVE_L1_BITNR), + QCOW2_OL_ACTIVE_L2 = (1 << QCOW2_OL_ACTIVE_L2_BITNR), + QCOW2_OL_REFCOUNT_TABLE = (1 << QCOW2_OL_REFCOUNT_TABLE_BITNR), + QCOW2_OL_REFCOUNT_BLOCK = (1 << QCOW2_OL_REFCOUNT_BLOCK_BITNR), + QCOW2_OL_SNAPSHOT_TABLE = (1 << QCOW2_OL_SNAPSHOT_TABLE_BITNR), + QCOW2_OL_INACTIVE_L1 = (1 << QCOW2_OL_INACTIVE_L1_BITNR), /* NOTE: Checking overlaps with inactive L2 tables will result in bdrv * reads. */ - QCOW2_OL_INACTIVE_L2 = (1 << QCOW2_OL_INACTIVE_L2_BITNR), + QCOW2_OL_INACTIVE_L2 = (1 << QCOW2_OL_INACTIVE_L2_BITNR), + QCOW2_OL_BITMAP_DIRECTORY = (1 << QCOW2_OL_BITMAP_DIRECTORY_BITNR), } QCow2MetadataOverlap; /* Perform all overlap checks which can be done in constant time */ #define QCOW2_OL_CONSTANT \ (QCOW2_OL_MAIN_HEADER | QCOW2_OL_ACTIVE_L1 | QCOW2_OL_REFCOUNT_TABLE | \ - QCOW2_OL_SNAPSHOT_TABLE) + QCOW2_OL_SNAPSHOT_TABLE | QCOW2_OL_BITMAP_DIRECTORY) /* Perform all overlap checks which don't require disk access */ #define QCOW2_OL_CACHED \ diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c index f45e46cfbd..fb750ba8d3 100644 --- a/block/qcow2-bitmap.c +++ b/block/qcow2-bitmap.c @@ -776,7 +776,12 @@ static int bitmap_list_store(BlockDriverState *bs, Qcow2BitmapList *bm_list, } } - ret = qcow2_pre_write_overlap_check(bs, 0, dir_offset, dir_size); + /* Actually, even in in-place case ignoring QCOW2_OL_BITMAP_DIRECTORY is not + * necessary, because we drop QCOW2_AUTOCLEAR_BITMAPS when updating bitmap + * directory in-place (actually, turn-off the extension), which is checked + * in qcow2_check_metadata_overlap() */ + ret = qcow2_pre_write_overlap_check( + bs, in_place ? QCOW2_OL_BITMAP_DIRECTORY : 0, dir_offset, dir_size); if (ret < 0) { goto fail; } diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c index 3de1ab51ba..275a303cfa 100644 --- a/block/qcow2-refcount.c +++ b/block/qcow2-refcount.c @@ -2585,6 +2585,16 @@ int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset, } } + if ((chk & QCOW2_OL_BITMAP_DIRECTORY) && + (s->autoclear_features & QCOW2_AUTOCLEAR_BITMAPS)) + { + if (overlaps_with(s->bitmap_directory_offset, + s->bitmap_directory_size)) + { + return QCOW2_OL_BITMAP_DIRECTORY; + } + } + return 0; } diff --git a/block/qcow2.c b/block/qcow2.c index 1914a940e5..23f36a67c7 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -655,6 +655,11 @@ static QemuOptsList qcow2_runtime_opts = { .help = "Check for unintended writes into an inactive L2 table", }, { + .name = QCOW2_OPT_OVERLAP_BITMAP_DIRECTORY, + .type = QEMU_OPT_BOOL, + .help = "Check for unintended writes into the bitmap directory", + }, + { .name = QCOW2_OPT_CACHE_SIZE, .type = QEMU_OPT_SIZE, .help = "Maximum combined metadata (L2 tables and refcount blocks) " @@ -682,14 +687,15 @@ static QemuOptsList qcow2_runtime_opts = { }; static const char *overlap_bool_option_names[QCOW2_OL_MAX_BITNR] = { - [QCOW2_OL_MAIN_HEADER_BITNR] = QCOW2_OPT_OVERLAP_MAIN_HEADER, - [QCOW2_OL_ACTIVE_L1_BITNR] = QCOW2_OPT_OVERLAP_ACTIVE_L1, - [QCOW2_OL_ACTIVE_L2_BITNR] = QCOW2_OPT_OVERLAP_ACTIVE_L2, - [QCOW2_OL_REFCOUNT_TABLE_BITNR] = QCOW2_OPT_OVERLAP_REFCOUNT_TABLE, - [QCOW2_OL_REFCOUNT_BLOCK_BITNR] = QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK, - [QCOW2_OL_SNAPSHOT_TABLE_BITNR] = QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE, - [QCOW2_OL_INACTIVE_L1_BITNR] = QCOW2_OPT_OVERLAP_INACTIVE_L1, - [QCOW2_OL_INACTIVE_L2_BITNR] = QCOW2_OPT_OVERLAP_INACTIVE_L2, + [QCOW2_OL_MAIN_HEADER_BITNR] = QCOW2_OPT_OVERLAP_MAIN_HEADER, + [QCOW2_OL_ACTIVE_L1_BITNR] = QCOW2_OPT_OVERLAP_ACTIVE_L1, + [QCOW2_OL_ACTIVE_L2_BITNR] = QCOW2_OPT_OVERLAP_ACTIVE_L2, + [QCOW2_OL_REFCOUNT_TABLE_BITNR] = QCOW2_OPT_OVERLAP_REFCOUNT_TABLE, + [QCOW2_OL_REFCOUNT_BLOCK_BITNR] = QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK, + [QCOW2_OL_SNAPSHOT_TABLE_BITNR] = QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE, + [QCOW2_OL_INACTIVE_L1_BITNR] = QCOW2_OPT_OVERLAP_INACTIVE_L1, + [QCOW2_OL_INACTIVE_L2_BITNR] = QCOW2_OPT_OVERLAP_INACTIVE_L2, + [QCOW2_OL_BITMAP_DIRECTORY_BITNR] = QCOW2_OPT_OVERLAP_BITMAP_DIRECTORY, }; static void cache_clean_timer_cb(void *opaque) -- 2.11.1