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[Qemu-devel] [PATCH v2 4/7] block/qcow2: Implement status CB for amend
From: |
Max Reitz |
Subject: |
[Qemu-devel] [PATCH v2 4/7] block/qcow2: Implement status CB for amend |
Date: |
Sat, 2 Aug 2014 01:49:18 +0200 |
The only really time-consuming operation potentially performed by
qcow2_amend_options() is zero cluster expansion when downgrading qcow2
images from compat=1.1 to compat=0.10, so report status of that
operation and that operation only through the status CB.
For this, approximate the progress as the number of L1 entries visited
during the operation.
Signed-off-by: Max Reitz <address@hidden>
---
block/qcow2-cluster.c | 37 +++++++++++++++++++++++++++++++++----
block/qcow2.c | 7 ++++---
block/qcow2.h | 3 ++-
3 files changed, 39 insertions(+), 8 deletions(-)
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 4208dc0..2607715 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -1548,10 +1548,17 @@ fail:
* zero expansion (i.e., has been filled with zeroes and is referenced from an
* L2 table). nb_clusters contains the total cluster count of the image file,
* i.e., the number of bits in expanded_clusters.
+ *
+ * l1_entries and *visited_l1_entries are used to keep track of progress for
+ * status_cb(). l1_entries contains the total number of L1 entries and
+ * *visited_l1_entries counts all visited L1 entries.
*/
static int expand_zero_clusters_in_l1(BlockDriverState *bs, uint64_t *l1_table,
int l1_size, uint8_t **expanded_clusters,
- uint64_t *nb_clusters)
+ uint64_t *nb_clusters,
+ int64_t *visited_l1_entries,
+ int64_t l1_entries,
+ BlockDriverAmendStatusCB *status_cb)
{
BDRVQcowState *s = bs->opaque;
bool is_active_l1 = (l1_table == s->l1_table);
@@ -1571,6 +1578,10 @@ static int expand_zero_clusters_in_l1(BlockDriverState
*bs, uint64_t *l1_table,
if (!l2_offset) {
/* unallocated */
+ (*visited_l1_entries)++;
+ if (status_cb) {
+ status_cb(bs, *visited_l1_entries, l1_entries);
+ }
continue;
}
@@ -1703,6 +1714,11 @@ static int expand_zero_clusters_in_l1(BlockDriverState
*bs, uint64_t *l1_table,
}
}
}
+
+ (*visited_l1_entries)++;
+ if (status_cb) {
+ status_cb(bs, *visited_l1_entries, l1_entries);
+ }
}
ret = 0;
@@ -1729,21 +1745,32 @@ fail:
* allocation for pre-allocated ones). This is important for downgrading to a
* qcow2 version which doesn't yet support metadata zero clusters.
*/
-int qcow2_expand_zero_clusters(BlockDriverState *bs)
+int qcow2_expand_zero_clusters(BlockDriverState *bs,
+ BlockDriverAmendStatusCB *status_cb)
{
BDRVQcowState *s = bs->opaque;
uint64_t *l1_table = NULL;
uint64_t nb_clusters;
+ int64_t l1_entries = 0, visited_l1_entries = 0;
uint8_t *expanded_clusters;
int ret;
int i, j;
+ if (status_cb) {
+ l1_entries = s->l1_size;
+ for (i = 0; i < s->nb_snapshots; i++) {
+ l1_entries += s->snapshots[i].l1_size;
+ }
+ }
+
nb_clusters = size_to_clusters(s, bs->file->total_sectors *
BDRV_SECTOR_SIZE);
expanded_clusters = g_malloc0((nb_clusters + 7) / 8);
ret = expand_zero_clusters_in_l1(bs, s->l1_table, s->l1_size,
- &expanded_clusters, &nb_clusters);
+ &expanded_clusters, &nb_clusters,
+ &visited_l1_entries, l1_entries,
+ status_cb);
if (ret < 0) {
goto fail;
}
@@ -1777,7 +1804,9 @@ int qcow2_expand_zero_clusters(BlockDriverState *bs)
}
ret = expand_zero_clusters_in_l1(bs, l1_table, s->snapshots[i].l1_size,
- &expanded_clusters, &nb_clusters);
+ &expanded_clusters, &nb_clusters,
+ &visited_l1_entries, l1_entries,
+ status_cb);
if (ret < 0) {
goto fail;
}
diff --git a/block/qcow2.c b/block/qcow2.c
index a3a7efc..6e8c8ab 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2147,7 +2147,8 @@ static int qcow2_load_vmstate(BlockDriverState *bs,
uint8_t *buf,
* Downgrades an image's version. To achieve this, any incompatible features
* have to be removed.
*/
-static int qcow2_downgrade(BlockDriverState *bs, int target_version)
+static int qcow2_downgrade(BlockDriverState *bs, int target_version,
+ BlockDriverAmendStatusCB *status_cb)
{
BDRVQcowState *s = bs->opaque;
int current_version = s->qcow_version;
@@ -2196,7 +2197,7 @@ static int qcow2_downgrade(BlockDriverState *bs, int
target_version)
/* clearing autoclear features is trivial */
s->autoclear_features = 0;
- ret = qcow2_expand_zero_clusters(bs);
+ ret = qcow2_expand_zero_clusters(bs, status_cb);
if (ret < 0) {
return ret;
}
@@ -2289,7 +2290,7 @@ static int qcow2_amend_options(BlockDriverState *bs,
QemuOpts *opts,
return ret;
}
} else {
- ret = qcow2_downgrade(bs, new_version);
+ ret = qcow2_downgrade(bs, new_version, status_cb);
if (ret < 0) {
return ret;
}
diff --git a/block/qcow2.h b/block/qcow2.h
index b49424b..1c4f9bf 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -522,7 +522,8 @@ int qcow2_discard_clusters(BlockDriverState *bs, uint64_t
offset,
int nb_sectors, enum qcow2_discard_type type);
int qcow2_zero_clusters(BlockDriverState *bs, uint64_t offset, int nb_sectors);
-int qcow2_expand_zero_clusters(BlockDriverState *bs);
+int qcow2_expand_zero_clusters(BlockDriverState *bs,
+ BlockDriverAmendStatusCB *status_cb);
/* qcow2-snapshot.c functions */
int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);
--
2.0.3