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HE1PR0801MB1996; 20:uBAgtTOdOmIBkkv5ICMTHLsXoIWUsjjD6hiZsYf3Q+U9OwmmOEDdPFqronl6K74o8CVgEpzHmjAJ/ou0TmX8az0LPOtAKyY0T3FH0O9JupEFPahc9lmS2k5sU00ObjtAWKXanuHPnHT+ST6jAd7cvSpeVRWwYcx97XxfylNFXjA= X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Aug 2017 14:19:32.1464 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR0801MB1996 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 104.47.0.108 Subject: [Qemu-devel] [PATCH v4 09/15] qcow2: truncate preallocated space 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, Anton Nefedov , den@virtuozzo.com, qemu-block@nongnu.org, mreitz@redhat.com, "Denis V. Lunev" Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: "Denis V. Lunev" This could be done after calculation of the end of data and metadata in the qcow2 image. Signed-off-by: Denis V. Lunev Signed-off-by: Anton Nefedov --- block/qcow2.h | 3 +++ block/qcow2-cluster.c | 9 +++++++++ block/qcow2-refcount.c | 7 +++++++ block/qcow2.c | 7 +++++++ 4 files changed, 26 insertions(+) diff --git a/block/qcow2.h b/block/qcow2.h index ebbb9cf..595ed9c 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -330,6 +330,7 @@ typedef struct BDRVQcow2State { char *image_backing_format; uint64_t prealloc_size; + uint64_t data_end; } BDRVQcow2State; typedef struct Qcow2COWRegion { @@ -669,4 +670,6 @@ void qcow2_remove_persistent_dirty_bitmap(BlockDriverState *bs, const char *name, Error **errp); +void qcow2_update_data_end(BlockDriverState *bs, uint64_t off); + #endif diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index 0185986..75baaf4 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -2014,3 +2014,12 @@ fail: g_free(l1_table); return ret; } + +void qcow2_update_data_end(BlockDriverState *bs, uint64_t off) +{ + BDRVQcow2State *s = bs->opaque; + + if (s->data_end < off) { + s->data_end = off; + } +} diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c index c9b0dcb..d741a92 100644 --- a/block/qcow2-refcount.c +++ b/block/qcow2-refcount.c @@ -833,6 +833,9 @@ static int QEMU_WARN_UNUSED_RESULT update_refcount(BlockDriverState *bs, ret = alloc_refcount_block(bs, cluster_index, &refcount_block); if (ret < 0) { goto fail; + } else { + qcow2_update_data_end(bs, s->refcount_table_offset + + s->refcount_table_size * sizeof(uint64_t)); } } old_table_index = table_index; @@ -954,6 +957,8 @@ retry: s->free_cluster_index - 1 > (INT64_MAX >> s->cluster_bits)) { return -EFBIG; + } else { + qcow2_update_data_end(bs, s->free_cluster_index << s->cluster_bits); } #ifdef DEBUG_ALLOC2 @@ -1018,6 +1023,8 @@ int64_t qcow2_alloc_clusters_at(BlockDriverState *bs, uint64_t offset, if (ret < 0) { return ret; + } else { + qcow2_update_data_end(bs, offset + (nb_clusters << s->cluster_bits)); } return i; diff --git a/block/qcow2.c b/block/qcow2.c index 2a1d2f2..4696106 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -1498,6 +1498,8 @@ static int qcow2_do_open(BlockDriverState *bs, QDict *options, int flags, } } + s->data_end = bdrv_getlength(bs->file->bs); + #ifdef DEBUG_ALLOC { BdrvCheckResult result = {0}; @@ -2138,6 +2140,11 @@ static int qcow2_inactivate(BlockDriverState *bs) if (result == 0) { qcow2_mark_clean(bs); + + /* truncate preallocated space */ + if (!bs->read_only && s->data_end < bdrv_getlength(bs->file->bs)) { + bdrv_truncate(bs->file, s->data_end, PREALLOC_MODE_OFF, NULL); + } s->flags |= BDRV_O_INACTIVE; }