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qcow2: Fix bdrv_write_compressed error handling 

If during allocation of compressed clusters the cluster was already allocated
uncompressed, fail and properly release the l2_table (the latter avoids a
failed assertion).

While at it, make it return some real error numbers instead of -1.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
This commit is contained in:
Kevin Wolf 2011-10-18 17:12:44 +02:00
parent 41521fa4a6
commit 8f1efd00c4
2 changed files with 22 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
block/qcow2-cluster.c
View File

@ -568,8 +568,10 @@ uint64_t qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
} }
cluster_offset = be64_to_cpu(l2_table[l2_index]); cluster_offset = be64_to_cpu(l2_table[l2_index]);
if (cluster_offset & QCOW_OFLAG_COPIED) if (cluster_offset & QCOW_OFLAG_COPIED) {
return cluster_offset & ~QCOW_OFLAG_COPIED; qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table);
return 0;
}
if (cluster_offset) if (cluster_offset)
qcow2_free_any_clusters(bs, cluster_offset, 1); qcow2_free_any_clusters(bs, cluster_offset, 1);

29
block/qcow2.c
View File

@ -1053,8 +1053,8 @@ static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num,
Z_DEFLATED, -12, Z_DEFLATED, -12,
9, Z_DEFAULT_STRATEGY); 9, Z_DEFAULT_STRATEGY);
if (ret != 0) { if (ret != 0) {
g_free(out_buf); ret = -EINVAL;
return -1; goto fail;
} }
strm.avail_in = s->cluster_size; strm.avail_in = s->cluster_size;
@ -1064,9 +1064,9 @@ static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num,
ret = deflate(&strm, Z_FINISH); ret = deflate(&strm, Z_FINISH);
if (ret != Z_STREAM_END && ret != Z_OK) { if (ret != Z_STREAM_END && ret != Z_OK) {
g_free(out_buf);
deflateEnd(&strm); deflateEnd(&strm);
return -1; ret = -EINVAL;
goto fail;
} }
out_len = strm.next_out - out_buf; out_len = strm.next_out - out_buf;
@ -1074,22 +1074,29 @@ static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num,
if (ret != Z_STREAM_END || out_len >= s->cluster_size) { if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
/* could not compress: write normal cluster */ /* could not compress: write normal cluster */
bdrv_write(bs, sector_num, buf, s->cluster_sectors); ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors);
if (ret < 0) {
goto fail;
}
} else { } else {
cluster_offset = qcow2_alloc_compressed_cluster_offset(bs, cluster_offset = qcow2_alloc_compressed_cluster_offset(bs,
sector_num << 9, out_len); sector_num << 9, out_len);
if (!cluster_offset) if (!cluster_offset) {
return -1; ret = -EIO;
goto fail;
}
cluster_offset &= s->cluster_offset_mask; cluster_offset &= s->cluster_offset_mask;
BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED);
if (bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len) != out_len) { ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len);
g_free(out_buf); if (ret < 0) {
return -1; goto fail;
} }
} }
ret = 0;
fail:
g_free(out_buf); g_free(out_buf);
return 0; return ret;
} }
static BlockDriverAIOCB *qcow2_aio_flush(BlockDriverState *bs, static BlockDriverAIOCB *qcow2_aio_flush(BlockDriverState *bs,