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[PULL 18/34] qcow2: Replace QCOW2_CLUSTER_* with QCOW2_SUBCLUSTER_*
From: |
Max Reitz |
Subject: |
[PULL 18/34] qcow2: Replace QCOW2_CLUSTER_* with QCOW2_SUBCLUSTER_* |
Date: |
Tue, 25 Aug 2020 10:32:55 +0200 |
From: Alberto Garcia <berto@igalia.com>
In order to support extended L2 entries some functions of the qcow2
driver need to start dealing with subclusters instead of clusters.
qcow2_get_host_offset() is modified to return the subcluster type
instead of the cluster type, and all callers are updated to replace
all values of QCow2ClusterType with their QCow2SubclusterType
equivalents.
This patch only changes the data types, there are no semantic changes.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id:
<f6c29737c295f32cbee74c903c30b01820363b34.1594396418.git.berto@igalia.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
---
block/qcow2.h | 2 +-
block/qcow2-cluster.c | 10 +++----
block/qcow2.c | 70 ++++++++++++++++++++++---------------------
3 files changed, 42 insertions(+), 40 deletions(-)
diff --git a/block/qcow2.h b/block/qcow2.h
index 74f65793bd..5df761edc3 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -894,7 +894,7 @@ int qcow2_encrypt_sectors(BDRVQcow2State *s, int64_t
sector_num,
int qcow2_get_host_offset(BlockDriverState *bs, uint64_t offset,
unsigned int *bytes, uint64_t *host_offset,
- QCow2ClusterType *cluster_type);
+ QCow2SubclusterType *subcluster_type);
int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset,
unsigned int *bytes, uint64_t *host_offset,
QCowL2Meta **m);
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index ec0fe0e13b..5937937596 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -564,15 +564,15 @@ static int coroutine_fn
do_perform_cow_write(BlockDriverState *bs,
* offset that we are interested in.
*
* On exit, *bytes is the number of bytes starting at offset that have the same
- * cluster type and (if applicable) are stored contiguously in the image file.
- * The cluster type is stored in *cluster_type.
- * Compressed clusters are always returned one by one.
+ * subcluster type and (if applicable) are stored contiguously in the image
+ * file. The subcluster type is stored in *subcluster_type.
+ * Compressed clusters are always processed one by one.
*
* Returns 0 on success, -errno in error cases.
*/
int qcow2_get_host_offset(BlockDriverState *bs, uint64_t offset,
unsigned int *bytes, uint64_t *host_offset,
- QCow2ClusterType *cluster_type)
+ QCow2SubclusterType *subcluster_type)
{
BDRVQcow2State *s = bs->opaque;
unsigned int l2_index;
@@ -714,7 +714,7 @@ out:
assert(bytes_available - offset_in_cluster <= UINT_MAX);
*bytes = bytes_available - offset_in_cluster;
- *cluster_type = type;
+ *subcluster_type = qcow2_cluster_to_subcluster_type(type);
return 0;
diff --git a/block/qcow2.c b/block/qcow2.c
index 070f89c700..477d60dd71 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2043,7 +2043,7 @@ static int coroutine_fn
qcow2_co_block_status(BlockDriverState *bs,
BDRVQcow2State *s = bs->opaque;
uint64_t host_offset;
unsigned int bytes;
- QCow2ClusterType type;
+ QCow2SubclusterType type;
int ret, status = 0;
qemu_co_mutex_lock(&s->lock);
@@ -2063,15 +2063,16 @@ static int coroutine_fn
qcow2_co_block_status(BlockDriverState *bs,
*pnum = bytes;
- if ((type == QCOW2_CLUSTER_NORMAL || type == QCOW2_CLUSTER_ZERO_ALLOC) &&
- !s->crypto) {
+ if ((type == QCOW2_SUBCLUSTER_NORMAL ||
+ type == QCOW2_SUBCLUSTER_ZERO_ALLOC) && !s->crypto) {
*map = host_offset;
*file = s->data_file->bs;
status |= BDRV_BLOCK_OFFSET_VALID;
}
- if (type == QCOW2_CLUSTER_ZERO_PLAIN || type == QCOW2_CLUSTER_ZERO_ALLOC) {
+ if (type == QCOW2_SUBCLUSTER_ZERO_PLAIN ||
+ type == QCOW2_SUBCLUSTER_ZERO_ALLOC) {
status |= BDRV_BLOCK_ZERO;
- } else if (type != QCOW2_CLUSTER_UNALLOCATED) {
+ } else if (type != QCOW2_SUBCLUSTER_UNALLOCATED_PLAIN) {
status |= BDRV_BLOCK_DATA;
}
if (s->metadata_preallocation && (status & BDRV_BLOCK_DATA) &&
@@ -2168,7 +2169,7 @@ typedef struct Qcow2AioTask {
AioTask task;
BlockDriverState *bs;
- QCow2ClusterType cluster_type; /* only for read */
+ QCow2SubclusterType subcluster_type; /* only for read */
uint64_t host_offset; /* or full descriptor in compressed clusters */
uint64_t offset;
uint64_t bytes;
@@ -2181,7 +2182,7 @@ static coroutine_fn int
qcow2_co_preadv_task_entry(AioTask *task);
static coroutine_fn int qcow2_add_task(BlockDriverState *bs,
AioTaskPool *pool,
AioTaskFunc func,
- QCow2ClusterType cluster_type,
+ QCow2SubclusterType subcluster_type,
uint64_t host_offset,
uint64_t offset,
uint64_t bytes,
@@ -2195,7 +2196,7 @@ static coroutine_fn int qcow2_add_task(BlockDriverState
*bs,
*task = (Qcow2AioTask) {
.task.func = func,
.bs = bs,
- .cluster_type = cluster_type,
+ .subcluster_type = subcluster_type,
.qiov = qiov,
.host_offset = host_offset,
.offset = offset,
@@ -2206,7 +2207,7 @@ static coroutine_fn int qcow2_add_task(BlockDriverState
*bs,
trace_qcow2_add_task(qemu_coroutine_self(), bs, pool,
func == qcow2_co_preadv_task_entry ? "read" : "write",
- cluster_type, host_offset, offset, bytes,
+ subcluster_type, host_offset, offset, bytes,
qiov, qiov_offset);
if (!pool) {
@@ -2219,7 +2220,7 @@ static coroutine_fn int qcow2_add_task(BlockDriverState
*bs,
}
static coroutine_fn int qcow2_co_preadv_task(BlockDriverState *bs,
- QCow2ClusterType cluster_type,
+ QCow2SubclusterType subc_type,
uint64_t host_offset,
uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov,
@@ -2227,24 +2228,24 @@ static coroutine_fn int
qcow2_co_preadv_task(BlockDriverState *bs,
{
BDRVQcow2State *s = bs->opaque;
- switch (cluster_type) {
- case QCOW2_CLUSTER_ZERO_PLAIN:
- case QCOW2_CLUSTER_ZERO_ALLOC:
+ switch (subc_type) {
+ case QCOW2_SUBCLUSTER_ZERO_PLAIN:
+ case QCOW2_SUBCLUSTER_ZERO_ALLOC:
/* Both zero types are handled in qcow2_co_preadv_part */
g_assert_not_reached();
- case QCOW2_CLUSTER_UNALLOCATED:
+ case QCOW2_SUBCLUSTER_UNALLOCATED_PLAIN:
assert(bs->backing); /* otherwise handled in qcow2_co_preadv_part */
BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
return bdrv_co_preadv_part(bs->backing, offset, bytes,
qiov, qiov_offset, 0);
- case QCOW2_CLUSTER_COMPRESSED:
+ case QCOW2_SUBCLUSTER_COMPRESSED:
return qcow2_co_preadv_compressed(bs, host_offset,
offset, bytes, qiov, qiov_offset);
- case QCOW2_CLUSTER_NORMAL:
+ case QCOW2_SUBCLUSTER_NORMAL:
if (bs->encrypted) {
return qcow2_co_preadv_encrypted(bs, host_offset,
offset, bytes, qiov, qiov_offset);
@@ -2267,8 +2268,9 @@ static coroutine_fn int
qcow2_co_preadv_task_entry(AioTask *task)
assert(!t->l2meta);
- return qcow2_co_preadv_task(t->bs, t->cluster_type, t->host_offset,
- t->offset, t->bytes, t->qiov, t->qiov_offset);
+ return qcow2_co_preadv_task(t->bs, t->subcluster_type,
+ t->host_offset, t->offset, t->bytes,
+ t->qiov, t->qiov_offset);
}
static coroutine_fn int qcow2_co_preadv_part(BlockDriverState *bs,
@@ -2280,7 +2282,7 @@ static coroutine_fn int
qcow2_co_preadv_part(BlockDriverState *bs,
int ret = 0;
unsigned int cur_bytes; /* number of bytes in current iteration */
uint64_t host_offset = 0;
- QCow2ClusterType type;
+ QCow2SubclusterType type;
AioTaskPool *aio = NULL;
while (bytes != 0 && aio_task_pool_status(aio) == 0) {
@@ -2299,9 +2301,9 @@ static coroutine_fn int
qcow2_co_preadv_part(BlockDriverState *bs,
goto out;
}
- if (type == QCOW2_CLUSTER_ZERO_PLAIN ||
- type == QCOW2_CLUSTER_ZERO_ALLOC ||
- (type == QCOW2_CLUSTER_UNALLOCATED && !bs->backing))
+ if (type == QCOW2_SUBCLUSTER_ZERO_PLAIN ||
+ type == QCOW2_SUBCLUSTER_ZERO_ALLOC ||
+ (type == QCOW2_SUBCLUSTER_UNALLOCATED_PLAIN && !bs->backing))
{
qemu_iovec_memset(qiov, qiov_offset, 0, cur_bytes);
} else {
@@ -2534,7 +2536,7 @@ static coroutine_fn int
qcow2_co_pwritev_task_entry(AioTask *task)
{
Qcow2AioTask *t = container_of(task, Qcow2AioTask, task);
- assert(!t->cluster_type);
+ assert(!t->subcluster_type);
return qcow2_co_pwritev_task(t->bs, t->host_offset,
t->offset, t->bytes, t->qiov, t->qiov_offset,
@@ -3837,7 +3839,7 @@ static coroutine_fn int
qcow2_co_pwrite_zeroes(BlockDriverState *bs,
if (head || tail) {
uint64_t off;
unsigned int nr;
- QCow2ClusterType type;
+ QCow2SubclusterType type;
assert(head + bytes <= s->cluster_size);
@@ -3855,9 +3857,9 @@ static coroutine_fn int
qcow2_co_pwrite_zeroes(BlockDriverState *bs,
nr = s->cluster_size;
ret = qcow2_get_host_offset(bs, offset, &nr, &off, &type);
if (ret < 0 ||
- (type != QCOW2_CLUSTER_UNALLOCATED &&
- type != QCOW2_CLUSTER_ZERO_PLAIN &&
- type != QCOW2_CLUSTER_ZERO_ALLOC)) {
+ (type != QCOW2_SUBCLUSTER_UNALLOCATED_PLAIN &&
+ type != QCOW2_SUBCLUSTER_ZERO_PLAIN &&
+ type != QCOW2_SUBCLUSTER_ZERO_ALLOC)) {
qemu_co_mutex_unlock(&s->lock);
return -ENOTSUP;
}
@@ -3921,7 +3923,7 @@ qcow2_co_copy_range_from(BlockDriverState *bs,
while (bytes != 0) {
uint64_t copy_offset = 0;
- QCow2ClusterType type;
+ QCow2SubclusterType type;
/* prepare next request */
cur_bytes = MIN(bytes, INT_MAX);
cur_write_flags = write_flags;
@@ -3933,7 +3935,7 @@ qcow2_co_copy_range_from(BlockDriverState *bs,
}
switch (type) {
- case QCOW2_CLUSTER_UNALLOCATED:
+ case QCOW2_SUBCLUSTER_UNALLOCATED_PLAIN:
if (bs->backing && bs->backing->bs) {
int64_t backing_length = bdrv_getlength(bs->backing->bs);
if (src_offset >= backing_length) {
@@ -3948,16 +3950,16 @@ qcow2_co_copy_range_from(BlockDriverState *bs,
}
break;
- case QCOW2_CLUSTER_ZERO_PLAIN:
- case QCOW2_CLUSTER_ZERO_ALLOC:
+ case QCOW2_SUBCLUSTER_ZERO_PLAIN:
+ case QCOW2_SUBCLUSTER_ZERO_ALLOC:
cur_write_flags |= BDRV_REQ_ZERO_WRITE;
break;
- case QCOW2_CLUSTER_COMPRESSED:
+ case QCOW2_SUBCLUSTER_COMPRESSED:
ret = -ENOTSUP;
goto out;
- case QCOW2_CLUSTER_NORMAL:
+ case QCOW2_SUBCLUSTER_NORMAL:
child = s->data_file;
break;
@@ -4486,7 +4488,7 @@ static coroutine_fn int
qcow2_co_pwritev_compressed_task_entry(AioTask *task)
{
Qcow2AioTask *t = container_of(task, Qcow2AioTask, task);
- assert(!t->cluster_type && !t->l2meta);
+ assert(!t->subcluster_type && !t->l2meta);
return qcow2_co_pwritev_compressed_task(t->bs, t->offset, t->bytes,
t->qiov,
t->qiov_offset);
--
2.26.2
- [PULL 07/34] qcow2: Document the Extended L2 Entries feature, (continued)
- [PULL 07/34] qcow2: Document the Extended L2 Entries feature, Max Reitz, 2020/08/25
- [PULL 09/34] qcow2: Add subcluster-related fields to BDRVQcow2State, Max Reitz, 2020/08/25
- [PULL 10/34] qcow2: Add offset_to_sc_index(), Max Reitz, 2020/08/25
- [PULL 11/34] qcow2: Add offset_into_subcluster() and size_to_subclusters(), Max Reitz, 2020/08/25
- [PULL 12/34] qcow2: Add l2_entry_size(), Max Reitz, 2020/08/25
- [PULL 13/34] qcow2: Update get/set_l2_entry() and add get/set_l2_bitmap(), Max Reitz, 2020/08/25
- [PULL 08/34] qcow2: Add dummy has_subclusters() function, Max Reitz, 2020/08/25
- [PULL 15/34] qcow2: Add qcow2_get_subcluster_range_type(), Max Reitz, 2020/08/25
- [PULL 14/34] qcow2: Add QCow2SubclusterType and qcow2_get_subcluster_type(), Max Reitz, 2020/08/25
- [PULL 16/34] qcow2: Add qcow2_cluster_is_allocated(), Max Reitz, 2020/08/25
- [PULL 18/34] qcow2: Replace QCOW2_CLUSTER_* with QCOW2_SUBCLUSTER_*,
Max Reitz <=
- [PULL 19/34] qcow2: Handle QCOW2_SUBCLUSTER_UNALLOCATED_ALLOC, Max Reitz, 2020/08/25
- [PULL 22/34] qcow2: Add subcluster support to zero_in_l2_slice(), Max Reitz, 2020/08/25
- [PULL 21/34] qcow2: Add subcluster support to qcow2_get_host_offset(), Max Reitz, 2020/08/25
- [PULL 23/34] qcow2: Add subcluster support to discard_in_l2_slice(), Max Reitz, 2020/08/25
- [PULL 20/34] qcow2: Add subcluster support to calculate_l2_meta(), Max Reitz, 2020/08/25
- [PULL 27/34] qcow2: Add subcluster support to handle_alloc_space(), Max Reitz, 2020/08/25
- [PULL 25/34] qcow2: Update L2 bitmap in qcow2_alloc_cluster_link_l2(), Max Reitz, 2020/08/25
- [PULL 24/34] qcow2: Add subcluster support to check_refcounts_l2(), Max Reitz, 2020/08/25
- [PULL 28/34] qcow2: Add subcluster support to qcow2_co_pwrite_zeroes(), Max Reitz, 2020/08/25
- [PULL 29/34] qcow2: Add subcluster support to qcow2_measure(), Max Reitz, 2020/08/25