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Revert "qcow2: Bring synchronous read/write back to life" 

It was merely a workaround and the real fix is done now.
This reverts commit ef845c3bf4.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Kevin Wolf 2009-10-22 17:54:42 +02:00 committed by Anthony Liguori
parent db0ffc2402
commit 72ecf02d7d
3 changed files with 5 additions and 55 deletions
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6
block/qcow2-cluster.c
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@ -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) {

51
block/qcow2.c
View File

@ -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,

3
block/qcow2.h
View File

@ -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);