[Qemu-devel] [PATCH 8/8] Revert "qcow2: Bring synchronous read/write back to life"

[Kevin Wolf]

It was merely a workaround and the real fix is done now.
This reverts commit ef845c3bf421290153154635dc18eaa677cecb43.

Signed-off-by: Kevin Wolf <address@hidden>
---
 block/qcow2-cluster.c |    6 ++--
 block/qcow2.c         |   51 +-----------------------------------------------
 block/qcow2.h         |    3 --
 3 files changed, 5 insertions(+), 55 deletions(-)

diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index a7de820..e444e53 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -306,8 +306,8 @@ void qcow2_encrypt_sectors(BDRVQcowState *s, int64_t 
sector_num,
 }
 
 
-int qcow2_read(BlockDriverState *bs, int64_t sector_num, uint8_t *buf,
-    int nb_sectors)
+static int qcow_read(BlockDriverState *bs, int64_t sector_num,
+                     uint8_t *buf, int nb_sectors)
 {
     BDRVQcowState *s = bs->opaque;
     int ret, index_in_cluster, n, n1;
@@ -358,7 +358,7 @@ static int copy_sectors(BlockDriverState *bs, uint64_t 
start_sect,
     n = n_end - n_start;
     if (n <= 0)
         return 0;
-    ret = qcow2_read(bs, start_sect + n_start, s->cluster_data, n);
+    ret = qcow_read(bs, start_sect + n_start, s->cluster_data, n);
     if (ret < 0)
         return ret;
     if (s->crypt_method) {
diff --git a/block/qcow2.c b/block/qcow2.c
index 52584ed..a9e7682 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -934,51 +934,6 @@ static int qcow_make_empty(BlockDriverState *bs)
     return 0;
 }
 
-static int qcow2_write(BlockDriverState *bs, int64_t sector_num,
-                     const uint8_t *buf, int nb_sectors)
-{
-    BDRVQcowState *s = bs->opaque;
-    int ret, index_in_cluster, n;
-    uint64_t cluster_offset;
-    int n_end;
-    QCowL2Meta l2meta;
-
-    while (nb_sectors > 0) {
-        memset(&l2meta, 0, sizeof(l2meta));
-
-        index_in_cluster = sector_num & (s->cluster_sectors - 1);
-        n_end = index_in_cluster + nb_sectors;
-        if (s->crypt_method &&
-            n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors)
-            n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors;
-        cluster_offset = qcow2_alloc_cluster_offset(bs, sector_num << 9,
-                                              index_in_cluster,
-                                              n_end, &n, &l2meta);
-        if (!cluster_offset)
-            return -1;
-        if (s->crypt_method) {
-            qcow2_encrypt_sectors(s, sector_num, s->cluster_data, buf, n, 1,
-                            &s->aes_encrypt_key);
-            ret = bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512,
-                              s->cluster_data, n * 512);
-        } else {
-            ret = bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512, 
buf, n * 512);
-        }
-        if (ret != n * 512 || qcow2_alloc_cluster_link_l2(bs, cluster_offset, 
&l2meta) < 0) {
-            qcow2_free_any_clusters(bs, cluster_offset, l2meta.nb_clusters);
-            return -1;
-        }
-        nb_sectors -= n;
-        sector_num += n;
-        buf += n * 512;
-        if (l2meta.nb_clusters != 0) {
-            QLIST_REMOVE(&l2meta, next_in_flight);
-        }
-    }
-    s->cluster_cache_offset = -1; /* disable compressed cache */
-    return 0;
-}
-
 /* XXX: put compressed sectors first, then all the cluster aligned
    tables to avoid losing bytes in alignment */
 static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
@@ -1166,10 +1121,8 @@ static BlockDriver bdrv_qcow2 = {
     .bdrv_set_key      = qcow_set_key,
     .bdrv_make_empty   = qcow_make_empty,
 
-    .bdrv_read          = qcow2_read,
-    .bdrv_write         = qcow2_write,
-    .bdrv_aio_readv     = qcow_aio_readv,
-    .bdrv_aio_writev    = qcow_aio_writev,
+    .bdrv_aio_readv    = qcow_aio_readv,
+    .bdrv_aio_writev   = qcow_aio_writev,
     .bdrv_write_compressed = qcow_write_compressed,
 
     .bdrv_snapshot_create   = qcow2_snapshot_create,
diff --git a/block/qcow2.h b/block/qcow2.h
index d3f690a..26ab5d9 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -202,9 +202,6 @@ uint64_t 
qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
 int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, uint64_t cluster_offset,
     QCowL2Meta *m);
 
-int qcow2_read(BlockDriverState *bs, int64_t sector_num, uint8_t *buf,
-    int nb_sectors);
-
 /* qcow2-snapshot.c functions */
 int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);
 int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id);
-- 
1.6.2.5