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qcow2: Bring synchronous read/write back to life 

When the synchronous read and write functions were dropped, they were replaced
by generic emulation functions. Unfortunately, these emulation functions don't
provide the same semantics as the original functions did.

The original bdrv_read would mean that we read some data synchronously and that
we won't be interrupted during this read. The latter assumption is no longer
true with the emulation function which needs to use qemu_aio_poll and therefore
allows the callback of any other concurrent AIO request to be run during the
read. Which in turn means that (meta)data read earlier could have changed and
be invalid now. qcow2 is not prepared to work in this way and it's just scary
how many places there are where other requests could run.

I'm not sure yet where exactly it breaks, but you'll see breakage with virtio
on qcow2 with a backing file. Providing synchronous functions again fixes the
problem for me.

Patchworks-ID: 35437
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Kevin Wolf 2009-10-08 15:02:08 +02:00 committed by Anthony Liguori
parent be8b28a940
commit ef845c3bf4
3 changed files with 55 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
block/qcow2-cluster.c
View File

@ -306,8 +306,8 @@ void qcow2_encrypt_sectors(BDRVQcowState *s, int64_t sector_num,
}
static int qcow_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
int qcow2_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 = qcow_read(bs, start_sect + n_start, s->cluster_data, n);
ret = qcow2_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

@ -934,6 +934,51 @@ 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,
@ -1121,8 +1166,10 @@ static BlockDriver bdrv_qcow2 = {
.bdrv_set_key = qcow_set_key,
.bdrv_make_empty = qcow_make_empty,
.bdrv_aio_readv = qcow_aio_readv,
.bdrv_aio_writev = qcow_aio_writev,
.bdrv_read = qcow2_read,
.bdrv_write = qcow2_write,
.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

@ -202,6 +202,9 @@ 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);