diff options
| -rw-r--r-- | block/qcow2-bitmap.c | 7 | ||||
| -rw-r--r-- | block/qcow2-refcount.c | 10 | ||||
| -rw-r--r-- | block/qcow2.c | 22 | ||||
| -rw-r--r-- | block/qcow2.h | 45 | ||||
| -rw-r--r-- | qapi/block-core.json | 21 |
5 files changed, 66 insertions, 39 deletions
diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c index 69485aa1de..ba978ad2aa 100644 --- a/block/qcow2-bitmap.c +++ b/block/qcow2-bitmap.c @@ -775,7 +775,12 @@ 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 18c729aa27..1b9ecb1ca0 100644 --- a/block/qcow2-refcount.c +++ b/block/qcow2-refcount.c @@ -2705,6 +2705,16 @@ 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 f327116e52..5d668fc617 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -680,6 +680,11 @@ 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) " @@ -712,14 +717,15 @@ 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) diff --git a/block/qcow2.h b/block/qcow2.h index d6aca687d6..81b844e936 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -94,6 +94,7 @@ #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_L2_CACHE_ENTRY_SIZE "l2-cache-entry-size" @@ -400,34 +401,36 @@ 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/qapi/block-core.json b/qapi/block-core.json index 38b31250f9..13798b982d 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -2696,18 +2696,21 @@ # @template: Specifies a template mode which can be adjusted using the other # flags, defaults to 'cached' # +# @bitmap-directory: since 3.0 +# # Since: 2.9 ## { 'struct': 'Qcow2OverlapCheckFlags', - 'data': { '*template': 'Qcow2OverlapCheckMode', - '*main-header': 'bool', - '*active-l1': 'bool', - '*active-l2': 'bool', - '*refcount-table': 'bool', - '*refcount-block': 'bool', - '*snapshot-table': 'bool', - '*inactive-l1': 'bool', - '*inactive-l2': 'bool' } } + 'data': { '*template': 'Qcow2OverlapCheckMode', + '*main-header': 'bool', + '*active-l1': 'bool', + '*active-l2': 'bool', + '*refcount-table': 'bool', + '*refcount-block': 'bool', + '*snapshot-table': 'bool', + '*inactive-l1': 'bool', + '*inactive-l2': 'bool', + '*bitmap-directory': 'bool' } } ## # @Qcow2OverlapChecks: |