qcow2: add persistent dirty bitmaps support
Store persistent dirty bitmaps in qcow2 image. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-id: 20170628120530.31251-20-vsementsov@virtuozzo.com [mreitz: Always assign ret in store_bitmap() in case of an error] Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy
Max Reitz
parent
3dd10a06d1
commit
5f72826e7f
@ -27,6 +27,7 @@
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/cutils.h"
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#include "block/block_int.h"
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#include "block/qcow2.h"
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@ -42,6 +43,10 @@
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#define BME_MIN_GRANULARITY_BITS 9
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#define BME_MAX_NAME_SIZE 1023
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#if BME_MAX_TABLE_SIZE * 8ULL > INT_MAX
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#error In the code bitmap table physical size assumed to fit into int
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#endif
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/* Bitmap directory entry flags */
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#define BME_RESERVED_FLAGS 0xfffffffcU
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#define BME_FLAG_IN_USE (1U << 0)
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@ -72,6 +77,8 @@ typedef struct Qcow2BitmapTable {
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uint32_t size; /* number of 64bit entries */
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QSIMPLEQ_ENTRY(Qcow2BitmapTable) entry;
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} Qcow2BitmapTable;
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typedef QSIMPLEQ_HEAD(Qcow2BitmapTableList, Qcow2BitmapTable)
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Qcow2BitmapTableList;
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typedef struct Qcow2Bitmap {
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Qcow2BitmapTable table;
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@ -79,6 +86,8 @@ typedef struct Qcow2Bitmap {
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uint8_t granularity_bits;
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char *name;
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BdrvDirtyBitmap *dirty_bitmap;
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QSIMPLEQ_ENTRY(Qcow2Bitmap) entry;
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} Qcow2Bitmap;
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typedef QSIMPLEQ_HEAD(Qcow2BitmapList, Qcow2Bitmap) Qcow2BitmapList;
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@ -104,6 +113,15 @@ static int update_header_sync(BlockDriverState *bs)
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return bdrv_flush(bs);
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}
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static inline void bitmap_table_to_be(uint64_t *bitmap_table, size_t size)
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{
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size_t i;
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for (i = 0; i < size; ++i) {
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cpu_to_be64s(&bitmap_table[i]);
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}
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}
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static int check_table_entry(uint64_t entry, int cluster_size)
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{
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uint64_t offset;
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@ -127,6 +145,70 @@ static int check_table_entry(uint64_t entry, int cluster_size)
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return 0;
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}
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static int check_constraints_on_bitmap(BlockDriverState *bs,
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const char *name,
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uint32_t granularity,
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Error **errp)
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{
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BDRVQcow2State *s = bs->opaque;
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int granularity_bits = ctz32(granularity);
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int64_t len = bdrv_getlength(bs);
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assert(granularity > 0);
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assert((granularity & (granularity - 1)) == 0);
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if (len < 0) {
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error_setg_errno(errp, -len, "Failed to get size of '%s'",
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bdrv_get_device_or_node_name(bs));
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return len;
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}
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if (granularity_bits > BME_MAX_GRANULARITY_BITS) {
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error_setg(errp, "Granularity exceeds maximum (%llu bytes)",
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1ULL << BME_MAX_GRANULARITY_BITS);
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return -EINVAL;
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}
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if (granularity_bits < BME_MIN_GRANULARITY_BITS) {
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error_setg(errp, "Granularity is under minimum (%llu bytes)",
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1ULL << BME_MIN_GRANULARITY_BITS);
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return -EINVAL;
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}
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if ((len > (uint64_t)BME_MAX_PHYS_SIZE << granularity_bits) ||
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(len > (uint64_t)BME_MAX_TABLE_SIZE * s->cluster_size <<
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granularity_bits))
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{
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error_setg(errp, "Too much space will be occupied by the bitmap. "
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"Use larger granularity");
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return -EINVAL;
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}
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if (strlen(name) > BME_MAX_NAME_SIZE) {
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error_setg(errp, "Name length exceeds maximum (%u characters)",
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BME_MAX_NAME_SIZE);
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return -EINVAL;
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}
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return 0;
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}
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static void clear_bitmap_table(BlockDriverState *bs, uint64_t *bitmap_table,
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uint32_t bitmap_table_size)
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{
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BDRVQcow2State *s = bs->opaque;
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int i;
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for (i = 0; i < bitmap_table_size; ++i) {
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uint64_t addr = bitmap_table[i] & BME_TABLE_ENTRY_OFFSET_MASK;
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if (!addr) {
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continue;
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}
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qcow2_free_clusters(bs, addr, s->cluster_size, QCOW2_DISCARD_OTHER);
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bitmap_table[i] = 0;
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}
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}
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static int bitmap_table_load(BlockDriverState *bs, Qcow2BitmapTable *tb,
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uint64_t **bitmap_table)
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{
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@ -165,6 +247,28 @@ fail:
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return ret;
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}
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static int free_bitmap_clusters(BlockDriverState *bs, Qcow2BitmapTable *tb)
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{
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int ret;
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uint64_t *bitmap_table;
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ret = bitmap_table_load(bs, tb, &bitmap_table);
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if (ret < 0) {
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assert(bitmap_table == NULL);
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return ret;
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}
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clear_bitmap_table(bs, bitmap_table, tb->size);
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qcow2_free_clusters(bs, tb->offset, tb->size * sizeof(uint64_t),
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QCOW2_DISCARD_OTHER);
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g_free(bitmap_table);
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tb->offset = 0;
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tb->size = 0;
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return 0;
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}
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/* This function returns the number of disk sectors covered by a single qcow2
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* cluster of bitmap data. */
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static uint64_t sectors_covered_by_bitmap_cluster(const BDRVQcow2State *s,
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@ -748,6 +852,69 @@ static int update_ext_header_and_dir_in_place(BlockDriverState *bs,
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*/
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}
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static int update_ext_header_and_dir(BlockDriverState *bs,
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Qcow2BitmapList *bm_list)
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{
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BDRVQcow2State *s = bs->opaque;
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int ret;
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uint64_t new_offset = 0;
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uint64_t new_size = 0;
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uint32_t new_nb_bitmaps = 0;
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uint64_t old_offset = s->bitmap_directory_offset;
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uint64_t old_size = s->bitmap_directory_size;
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uint32_t old_nb_bitmaps = s->nb_bitmaps;
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uint64_t old_autocl = s->autoclear_features;
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if (bm_list != NULL && !QSIMPLEQ_EMPTY(bm_list)) {
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new_nb_bitmaps = bitmap_list_count(bm_list);
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if (new_nb_bitmaps > QCOW2_MAX_BITMAPS) {
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return -EINVAL;
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}
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ret = bitmap_list_store(bs, bm_list, &new_offset, &new_size, false);
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if (ret < 0) {
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return ret;
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}
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ret = bdrv_flush(bs->file->bs);
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if (ret < 0) {
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goto fail;
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}
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s->autoclear_features |= QCOW2_AUTOCLEAR_BITMAPS;
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} else {
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s->autoclear_features &= ~(uint64_t)QCOW2_AUTOCLEAR_BITMAPS;
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}
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s->bitmap_directory_offset = new_offset;
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s->bitmap_directory_size = new_size;
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s->nb_bitmaps = new_nb_bitmaps;
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ret = update_header_sync(bs);
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if (ret < 0) {
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goto fail;
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}
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if (old_size > 0) {
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qcow2_free_clusters(bs, old_offset, old_size, QCOW2_DISCARD_OTHER);
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}
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return 0;
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fail:
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if (new_offset > 0) {
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qcow2_free_clusters(bs, new_offset, new_size, QCOW2_DISCARD_OTHER);
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}
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s->bitmap_directory_offset = old_offset;
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s->bitmap_directory_size = old_size;
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s->nb_bitmaps = old_nb_bitmaps;
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s->autoclear_features = old_autocl;
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return ret;
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}
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/* for g_slist_foreach for GSList of BdrvDirtyBitmap* elements */
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static void release_dirty_bitmap_helper(gpointer bitmap,
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gpointer bs)
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@ -890,3 +1057,312 @@ out:
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return ret;
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}
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/* store_bitmap_data()
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* Store bitmap to image, filling bitmap table accordingly.
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*/
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static uint64_t *store_bitmap_data(BlockDriverState *bs,
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BdrvDirtyBitmap *bitmap,
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uint32_t *bitmap_table_size, Error **errp)
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{
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int ret;
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BDRVQcow2State *s = bs->opaque;
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int64_t sector;
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uint64_t sbc;
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uint64_t bm_size = bdrv_dirty_bitmap_size(bitmap);
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const char *bm_name = bdrv_dirty_bitmap_name(bitmap);
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uint8_t *buf = NULL;
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BdrvDirtyBitmapIter *dbi;
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uint64_t *tb;
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uint64_t tb_size =
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size_to_clusters(s,
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bdrv_dirty_bitmap_serialization_size(bitmap, 0, bm_size));
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if (tb_size > BME_MAX_TABLE_SIZE ||
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tb_size * s->cluster_size > BME_MAX_PHYS_SIZE)
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{
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error_setg(errp, "Bitmap '%s' is too big", bm_name);
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return NULL;
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}
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tb = g_try_new0(uint64_t, tb_size);
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if (tb == NULL) {
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error_setg(errp, "No memory");
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return NULL;
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}
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dbi = bdrv_dirty_iter_new(bitmap, 0);
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buf = g_malloc(s->cluster_size);
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sbc = sectors_covered_by_bitmap_cluster(s, bitmap);
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assert(DIV_ROUND_UP(bm_size, sbc) == tb_size);
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while ((sector = bdrv_dirty_iter_next(dbi)) != -1) {
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uint64_t cluster = sector / sbc;
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uint64_t end, write_size;
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int64_t off;
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sector = cluster * sbc;
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end = MIN(bm_size, sector + sbc);
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write_size =
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bdrv_dirty_bitmap_serialization_size(bitmap, sector, end - sector);
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assert(write_size <= s->cluster_size);
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off = qcow2_alloc_clusters(bs, s->cluster_size);
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if (off < 0) {
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error_setg_errno(errp, -off,
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"Failed to allocate clusters for bitmap '%s'",
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bm_name);
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goto fail;
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}
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tb[cluster] = off;
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bdrv_dirty_bitmap_serialize_part(bitmap, buf, sector, end - sector);
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if (write_size < s->cluster_size) {
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memset(buf + write_size, 0, s->cluster_size - write_size);
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}
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ret = qcow2_pre_write_overlap_check(bs, 0, off, s->cluster_size);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Qcow2 overlap check failed");
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goto fail;
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}
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ret = bdrv_pwrite(bs->file, off, buf, s->cluster_size);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Failed to write bitmap '%s' to file",
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bm_name);
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goto fail;
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}
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if (end >= bm_size) {
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break;
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}
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bdrv_set_dirty_iter(dbi, end);
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}
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*bitmap_table_size = tb_size;
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g_free(buf);
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bdrv_dirty_iter_free(dbi);
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return tb;
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fail:
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clear_bitmap_table(bs, tb, tb_size);
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g_free(buf);
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bdrv_dirty_iter_free(dbi);
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g_free(tb);
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return NULL;
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}
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/* store_bitmap()
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* Store bm->dirty_bitmap to qcow2.
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* Set bm->table_offset and bm->table_size accordingly.
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*/
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static int store_bitmap(BlockDriverState *bs, Qcow2Bitmap *bm, Error **errp)
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{
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int ret;
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uint64_t *tb;
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int64_t tb_offset;
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uint32_t tb_size;
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BdrvDirtyBitmap *bitmap = bm->dirty_bitmap;
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const char *bm_name;
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assert(bitmap != NULL);
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bm_name = bdrv_dirty_bitmap_name(bitmap);
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tb = store_bitmap_data(bs, bitmap, &tb_size, errp);
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if (tb == NULL) {
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return -EINVAL;
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}
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assert(tb_size <= BME_MAX_TABLE_SIZE);
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tb_offset = qcow2_alloc_clusters(bs, tb_size * sizeof(tb[0]));
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if (tb_offset < 0) {
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error_setg_errno(errp, -tb_offset,
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"Failed to allocate clusters for bitmap '%s'",
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bm_name);
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ret = tb_offset;
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goto fail;
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}
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ret = qcow2_pre_write_overlap_check(bs, 0, tb_offset,
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tb_size * sizeof(tb[0]));
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Qcow2 overlap check failed");
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goto fail;
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}
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bitmap_table_to_be(tb, tb_size);
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ret = bdrv_pwrite(bs->file, tb_offset, tb, tb_size * sizeof(tb[0]));
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Failed to write bitmap '%s' to file",
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bm_name);
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goto fail;
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}
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g_free(tb);
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bm->table.offset = tb_offset;
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bm->table.size = tb_size;
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return 0;
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fail:
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clear_bitmap_table(bs, tb, tb_size);
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if (tb_offset > 0) {
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qcow2_free_clusters(bs, tb_offset, tb_size * sizeof(tb[0]),
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QCOW2_DISCARD_OTHER);
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}
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g_free(tb);
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return ret;
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}
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static Qcow2Bitmap *find_bitmap_by_name(Qcow2BitmapList *bm_list,
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const char *name)
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{
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Qcow2Bitmap *bm;
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QSIMPLEQ_FOREACH(bm, bm_list, entry) {
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if (strcmp(name, bm->name) == 0) {
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return bm;
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}
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}
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return NULL;
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}
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void qcow2_store_persistent_dirty_bitmaps(BlockDriverState *bs, Error **errp)
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{
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BdrvDirtyBitmap *bitmap;
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BDRVQcow2State *s = bs->opaque;
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uint32_t new_nb_bitmaps = s->nb_bitmaps;
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uint64_t new_dir_size = s->bitmap_directory_size;
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int ret;
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Qcow2BitmapList *bm_list;
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Qcow2Bitmap *bm;
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Qcow2BitmapTableList drop_tables;
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Qcow2BitmapTable *tb, *tb_next;
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if (!bdrv_has_changed_persistent_bitmaps(bs)) {
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/* nothing to do */
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return;
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}
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if (!can_write(bs)) {
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error_setg(errp, "No write access");
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return;
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}
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QSIMPLEQ_INIT(&drop_tables);
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if (s->nb_bitmaps == 0) {
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bm_list = bitmap_list_new();
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} else {
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bm_list = bitmap_list_load(bs, s->bitmap_directory_offset,
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s->bitmap_directory_size, errp);
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if (bm_list == NULL) {
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return;
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}
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}
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/* check constraints and names */
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for (bitmap = bdrv_dirty_bitmap_next(bs, NULL); bitmap != NULL;
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bitmap = bdrv_dirty_bitmap_next(bs, bitmap))
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{
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const char *name = bdrv_dirty_bitmap_name(bitmap);
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uint32_t granularity = bdrv_dirty_bitmap_granularity(bitmap);
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Qcow2Bitmap *bm;
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if (!bdrv_dirty_bitmap_get_persistance(bitmap) ||
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bdrv_dirty_bitmap_readonly(bitmap))
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{
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continue;
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}
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if (check_constraints_on_bitmap(bs, name, granularity, errp) < 0) {
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error_prepend(errp, "Bitmap '%s' doesn't satisfy the constraints: ",
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name);
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goto fail;
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}
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bm = find_bitmap_by_name(bm_list, name);
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if (bm == NULL) {
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if (++new_nb_bitmaps > QCOW2_MAX_BITMAPS) {
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error_setg(errp, "Too many persistent bitmaps");
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goto fail;
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}
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new_dir_size += calc_dir_entry_size(strlen(name), 0);
|
||||
if (new_dir_size > QCOW2_MAX_BITMAP_DIRECTORY_SIZE) {
|
||||
error_setg(errp, "Bitmap directory is too large");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
bm = g_new0(Qcow2Bitmap, 1);
|
||||
bm->name = g_strdup(name);
|
||||
QSIMPLEQ_INSERT_TAIL(bm_list, bm, entry);
|
||||
} else {
|
||||
if (!(bm->flags & BME_FLAG_IN_USE)) {
|
||||
error_setg(errp, "Bitmap '%s' already exists in the image",
|
||||
name);
|
||||
goto fail;
|
||||
}
|
||||
tb = g_memdup(&bm->table, sizeof(bm->table));
|
||||
bm->table.offset = 0;
|
||||
bm->table.size = 0;
|
||||
QSIMPLEQ_INSERT_TAIL(&drop_tables, tb, entry);
|
||||
}
|
||||
bm->flags = bdrv_dirty_bitmap_get_autoload(bitmap) ? BME_FLAG_AUTO : 0;
|
||||
bm->granularity_bits = ctz32(bdrv_dirty_bitmap_granularity(bitmap));
|
||||
bm->dirty_bitmap = bitmap;
|
||||
}
|
||||
|
||||
/* allocate clusters and store bitmaps */
|
||||
QSIMPLEQ_FOREACH(bm, bm_list, entry) {
|
||||
if (bm->dirty_bitmap == NULL) {
|
||||
continue;
|
||||
}
|
||||
|
||||
ret = store_bitmap(bs, bm, errp);
|
||||
if (ret < 0) {
|
||||
goto fail;
|
||||
}
|
||||
}
|
||||
|
||||
ret = update_ext_header_and_dir(bs, bm_list);
|
||||
if (ret < 0) {
|
||||
error_setg_errno(errp, -ret, "Failed to update bitmap extension");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
/* Bitmap directory was successfully updated, so, old data can be dropped.
|
||||
* TODO it is better to reuse these clusters */
|
||||
QSIMPLEQ_FOREACH_SAFE(tb, &drop_tables, entry, tb_next) {
|
||||
free_bitmap_clusters(bs, tb);
|
||||
g_free(tb);
|
||||
}
|
||||
|
||||
bitmap_list_free(bm_list);
|
||||
return;
|
||||
|
||||
fail:
|
||||
QSIMPLEQ_FOREACH(bm, bm_list, entry) {
|
||||
if (bm->dirty_bitmap == NULL || bm->table.offset == 0) {
|
||||
continue;
|
||||
}
|
||||
|
||||
free_bitmap_clusters(bs, &bm->table);
|
||||
}
|
||||
|
||||
QSIMPLEQ_FOREACH_SAFE(tb, &drop_tables, entry, tb_next) {
|
||||
g_free(tb);
|
||||
}
|
||||
|
||||
bitmap_list_free(bm_list);
|
||||
}
|
||||
|
||||
@ -2046,6 +2046,7 @@ static int qcow2_inactivate(BlockDriverState *bs)
|
||||
{
|
||||
BDRVQcow2State *s = bs->opaque;
|
||||
int ret, result = 0;
|
||||
Error *local_err = NULL;
|
||||
|
||||
ret = qcow2_cache_flush(bs, s->l2_table_cache);
|
||||
if (ret) {
|
||||
@ -2061,6 +2062,14 @@ static int qcow2_inactivate(BlockDriverState *bs)
|
||||
strerror(-ret));
|
||||
}
|
||||
|
||||
qcow2_store_persistent_dirty_bitmaps(bs, &local_err);
|
||||
if (local_err != NULL) {
|
||||
result = -EINVAL;
|
||||
error_report_err(local_err);
|
||||
error_report("Persistent bitmaps are lost for node '%s'",
|
||||
bdrv_get_device_or_node_name(bs));
|
||||
}
|
||||
|
||||
if (result == 0) {
|
||||
qcow2_mark_clean(bs);
|
||||
}
|
||||
|
||||
@ -647,5 +647,6 @@ int qcow2_check_bitmaps_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
|
||||
int64_t *refcount_table_size);
|
||||
bool qcow2_load_autoloading_dirty_bitmaps(BlockDriverState *bs, Error **errp);
|
||||
int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp);
|
||||
void qcow2_store_persistent_dirty_bitmaps(BlockDriverState *bs, Error **errp);
|
||||
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user