diff options
| author | Max Reitz <mreitz@redhat.com> | 2013-08-30 14:34:26 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2013-08-30 15:48:43 +0200 |
| commit | cf93980e775b709ec8f33f55846e6dcf1c7a612c (patch) | |
| tree | f16f3842e9fe4dcda7f1ea5358bb5185eac06d96 /block/qcow2.c | |
| parent | a40f1c2add4d5f58d594f810fe36cabcf32bc4b0 (diff) | |
| download | qemu-cf93980e775b709ec8f33f55846e6dcf1c7a612c.tar.gz | |
qcow2: Employ metadata overlap checks
The pre-write overlap check function is now called before most of the
qcow2 writes (aborting it on collision or other error).
Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/qcow2.c')
| -rw-r--r-- | block/qcow2.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/block/qcow2.c b/block/qcow2.c index fe915681b2..05e002d856 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -624,6 +624,8 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags) qcow2_free_snapshots(bs); qcow2_refcount_close(bs); g_free(s->l1_table); + /* else pre-write overlap checks in cache_destroy may crash */ + s->l1_table = NULL; if (s->l2_table_cache) { qcow2_cache_destroy(bs, s->l2_table_cache); } @@ -923,6 +925,13 @@ static coroutine_fn int qcow2_co_writev(BlockDriverState *bs, cur_nr_sectors * 512); } + ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT, + cluster_offset + index_in_cluster * BDRV_SECTOR_SIZE, + cur_nr_sectors * BDRV_SECTOR_SIZE); + if (ret < 0) { + goto fail; + } + qemu_co_mutex_unlock(&s->lock); BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); trace_qcow2_writev_data(qemu_coroutine_self(), @@ -989,6 +998,8 @@ static void qcow2_close(BlockDriverState *bs) { BDRVQcowState *s = bs->opaque; g_free(s->l1_table); + /* else pre-write overlap checks in cache_destroy may crash */ + s->l1_table = NULL; qcow2_cache_flush(bs, s->l2_table_cache); qcow2_cache_flush(bs, s->refcount_block_cache); @@ -1668,6 +1679,14 @@ static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num, if (ret != Z_STREAM_END || out_len >= s->cluster_size) { /* could not compress: write normal cluster */ + + ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT, + sector_num * BDRV_SECTOR_SIZE, + s->cluster_sectors * BDRV_SECTOR_SIZE); + if (ret < 0) { + goto fail; + } + ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors); if (ret < 0) { goto fail; @@ -1680,6 +1699,13 @@ static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num, goto fail; } cluster_offset &= s->cluster_offset_mask; + + ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT, + cluster_offset, out_len); + if (ret < 0) { + goto fail; + } + BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len); if (ret < 0) { |