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[Qemu-devel] [PULL 45/55] qcow2: Prepare expand_zero_clusters_in_l1() fo
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PULL 45/55] qcow2: Prepare expand_zero_clusters_in_l1() for adding L2 slice support |
Date: |
Tue, 13 Feb 2018 18:05:19 +0100 |
From: Alberto Garcia <address@hidden>
Adding support for L2 slices to expand_zero_clusters_in_l1() needs
(among other things) an extra loop that iterates over all slices of
each L2 table.
Putting all changes in one patch would make it hard to read because
all semantic changes would be mixed with pure indentation changes.
To make things easier this patch simply creates a new block and
changes the indentation of all lines of code inside it. Thus, all
modifications in this patch are cosmetic. There are no semantic
changes and no variables are renamed yet. The next patch will take
care of that.
Signed-off-by: Alberto Garcia <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
Reviewed-by: Max Reitz <address@hidden>
Message-id: address@hidden
Signed-off-by: Max Reitz <address@hidden>
---
block/qcow2-cluster.c | 187 ++++++++++++++++++++++++++------------------------
1 file changed, 96 insertions(+), 91 deletions(-)
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 1041dcb6dd..ccb2944eda 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -1904,118 +1904,123 @@ static int
expand_zero_clusters_in_l1(BlockDriverState *bs, uint64_t *l1_table,
goto fail;
}
- if (is_active_l1) {
- /* get active L2 tables from cache */
- ret = qcow2_cache_get(bs, s->l2_table_cache, l2_offset,
- (void **)&l2_table);
- } else {
- /* load inactive L2 tables from disk */
- ret = bdrv_read(bs->file, l2_offset / BDRV_SECTOR_SIZE,
- (void *)l2_table, s->cluster_sectors);
- }
- if (ret < 0) {
- goto fail;
- }
-
- for (j = 0; j < s->l2_size; j++) {
- uint64_t l2_entry = be64_to_cpu(l2_table[j]);
- int64_t offset = l2_entry & L2E_OFFSET_MASK;
- QCow2ClusterType cluster_type = qcow2_get_cluster_type(l2_entry);
-
- if (cluster_type != QCOW2_CLUSTER_ZERO_PLAIN &&
- cluster_type != QCOW2_CLUSTER_ZERO_ALLOC) {
- continue;
+ {
+ if (is_active_l1) {
+ /* get active L2 tables from cache */
+ ret = qcow2_cache_get(bs, s->l2_table_cache, l2_offset,
+ (void **)&l2_table);
+ } else {
+ /* load inactive L2 tables from disk */
+ ret = bdrv_read(bs->file, l2_offset / BDRV_SECTOR_SIZE,
+ (void *)l2_table, s->cluster_sectors);
+ }
+ if (ret < 0) {
+ goto fail;
}
- if (cluster_type == QCOW2_CLUSTER_ZERO_PLAIN) {
- if (!bs->backing) {
- /* not backed; therefore we can simply deallocate the
- * cluster */
- l2_table[j] = 0;
- l2_dirty = true;
+ for (j = 0; j < s->l2_size; j++) {
+ uint64_t l2_entry = be64_to_cpu(l2_table[j]);
+ int64_t offset = l2_entry & L2E_OFFSET_MASK;
+ QCow2ClusterType cluster_type =
+ qcow2_get_cluster_type(l2_entry);
+
+ if (cluster_type != QCOW2_CLUSTER_ZERO_PLAIN &&
+ cluster_type != QCOW2_CLUSTER_ZERO_ALLOC) {
continue;
}
- offset = qcow2_alloc_clusters(bs, s->cluster_size);
- if (offset < 0) {
- ret = offset;
- goto fail;
- }
+ if (cluster_type == QCOW2_CLUSTER_ZERO_PLAIN) {
+ if (!bs->backing) {
+ /* not backed; therefore we can simply deallocate the
+ * cluster */
+ l2_table[j] = 0;
+ l2_dirty = true;
+ continue;
+ }
+
+ offset = qcow2_alloc_clusters(bs, s->cluster_size);
+ if (offset < 0) {
+ ret = offset;
+ goto fail;
+ }
- if (l2_refcount > 1) {
- /* For shared L2 tables, set the refcount accordingly (it
is
- * already 1 and needs to be l2_refcount) */
- ret = qcow2_update_cluster_refcount(bs,
- offset >> s->cluster_bits,
+ if (l2_refcount > 1) {
+ /* For shared L2 tables, set the refcount accordingly
+ * (it is already 1 and needs to be l2_refcount) */
+ ret = qcow2_update_cluster_refcount(
+ bs, offset >> s->cluster_bits,
refcount_diff(1, l2_refcount), false,
QCOW2_DISCARD_OTHER);
- if (ret < 0) {
- qcow2_free_clusters(bs, offset, s->cluster_size,
- QCOW2_DISCARD_OTHER);
- goto fail;
+ if (ret < 0) {
+ qcow2_free_clusters(bs, offset, s->cluster_size,
+ QCOW2_DISCARD_OTHER);
+ goto fail;
+ }
}
}
- }
- if (offset_into_cluster(s, offset)) {
- qcow2_signal_corruption(bs, true, -1, -1,
- "Cluster allocation offset "
- "%#" PRIx64 " unaligned (L2 offset: %#"
- PRIx64 ", L2 index: %#x)", offset,
- l2_offset, j);
- if (cluster_type == QCOW2_CLUSTER_ZERO_PLAIN) {
- qcow2_free_clusters(bs, offset, s->cluster_size,
- QCOW2_DISCARD_ALWAYS);
+ if (offset_into_cluster(s, offset)) {
+ qcow2_signal_corruption(
+ bs, true, -1, -1,
+ "Cluster allocation offset "
+ "%#" PRIx64 " unaligned (L2 offset: %#"
+ PRIx64 ", L2 index: %#x)", offset,
+ l2_offset, j);
+ if (cluster_type == QCOW2_CLUSTER_ZERO_PLAIN) {
+ qcow2_free_clusters(bs, offset, s->cluster_size,
+ QCOW2_DISCARD_ALWAYS);
+ }
+ ret = -EIO;
+ goto fail;
}
- ret = -EIO;
- goto fail;
- }
- ret = qcow2_pre_write_overlap_check(bs, 0, offset,
s->cluster_size);
- if (ret < 0) {
- if (cluster_type == QCOW2_CLUSTER_ZERO_PLAIN) {
- qcow2_free_clusters(bs, offset, s->cluster_size,
- QCOW2_DISCARD_ALWAYS);
+ ret = qcow2_pre_write_overlap_check(bs, 0, offset,
+ s->cluster_size);
+ if (ret < 0) {
+ if (cluster_type == QCOW2_CLUSTER_ZERO_PLAIN) {
+ qcow2_free_clusters(bs, offset, s->cluster_size,
+ QCOW2_DISCARD_ALWAYS);
+ }
+ goto fail;
}
- goto fail;
- }
- ret = bdrv_pwrite_zeroes(bs->file, offset, s->cluster_size, 0);
- if (ret < 0) {
- if (cluster_type == QCOW2_CLUSTER_ZERO_PLAIN) {
- qcow2_free_clusters(bs, offset, s->cluster_size,
- QCOW2_DISCARD_ALWAYS);
+ ret = bdrv_pwrite_zeroes(bs->file, offset, s->cluster_size, 0);
+ if (ret < 0) {
+ if (cluster_type == QCOW2_CLUSTER_ZERO_PLAIN) {
+ qcow2_free_clusters(bs, offset, s->cluster_size,
+ QCOW2_DISCARD_ALWAYS);
+ }
+ goto fail;
}
- goto fail;
- }
- if (l2_refcount == 1) {
- l2_table[j] = cpu_to_be64(offset | QCOW_OFLAG_COPIED);
- } else {
- l2_table[j] = cpu_to_be64(offset);
+ if (l2_refcount == 1) {
+ l2_table[j] = cpu_to_be64(offset | QCOW_OFLAG_COPIED);
+ } else {
+ l2_table[j] = cpu_to_be64(offset);
+ }
+ l2_dirty = true;
}
- l2_dirty = true;
- }
- if (is_active_l1) {
- if (l2_dirty) {
- qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_table);
- qcow2_cache_depends_on_flush(s->l2_table_cache);
- }
- qcow2_cache_put(s->l2_table_cache, (void **) &l2_table);
- } else {
- if (l2_dirty) {
- ret = qcow2_pre_write_overlap_check(bs,
- QCOW2_OL_INACTIVE_L2 | QCOW2_OL_ACTIVE_L2, l2_offset,
- s->cluster_size);
- if (ret < 0) {
- goto fail;
+ if (is_active_l1) {
+ if (l2_dirty) {
+ qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_table);
+ qcow2_cache_depends_on_flush(s->l2_table_cache);
}
+ qcow2_cache_put(s->l2_table_cache, (void **) &l2_table);
+ } else {
+ if (l2_dirty) {
+ ret = qcow2_pre_write_overlap_check(
+ bs, QCOW2_OL_INACTIVE_L2 | QCOW2_OL_ACTIVE_L2,
+ l2_offset, s->cluster_size);
+ if (ret < 0) {
+ goto fail;
+ }
- ret = bdrv_write(bs->file, l2_offset / BDRV_SECTOR_SIZE,
- (void *)l2_table, s->cluster_sectors);
- if (ret < 0) {
- goto fail;
+ ret = bdrv_write(bs->file, l2_offset / BDRV_SECTOR_SIZE,
+ (void *)l2_table, s->cluster_sectors);
+ if (ret < 0) {
+ goto fail;
+ }
}
}
}
--
2.13.6
- [Qemu-devel] [PULL 36/55] qcow2: Update qcow2_get_cluster_offset() to support L2 slices, (continued)
- [Qemu-devel] [PULL 36/55] qcow2: Update qcow2_get_cluster_offset() to support L2 slices, Kevin Wolf, 2018/02/13
- [Qemu-devel] [PULL 38/55] qcow2: Update handle_copied() to support L2 slices, Kevin Wolf, 2018/02/13
- [Qemu-devel] [PULL 39/55] qcow2: Update handle_alloc() to support L2 slices, Kevin Wolf, 2018/02/13
- [Qemu-devel] [PULL 42/55] qcow2: Prepare qcow2_update_snapshot_refcount() for adding L2 slice support, Kevin Wolf, 2018/02/13
- [Qemu-devel] [PULL 44/55] qcow2: Read refcount before L2 table in expand_zero_clusters_in_l1(), Kevin Wolf, 2018/02/13
- [Qemu-devel] [PULL 46/55] qcow2: Update expand_zero_clusters_in_l1() to support L2 slices, Kevin Wolf, 2018/02/13
- [Qemu-devel] [PULL 43/55] qcow2: Update qcow2_update_snapshot_refcount() to support L2 slices, Kevin Wolf, 2018/02/13
- [Qemu-devel] [PULL 47/55] qcow2: Update qcow2_truncate() to support L2 slices, Kevin Wolf, 2018/02/13
- [Qemu-devel] [PULL 51/55] qcow2: Rename l2_table in count_cow_clusters(), Kevin Wolf, 2018/02/13
- [Qemu-devel] [PULL 54/55] iotests: Test downgrading an image using a small L2 slice size, Kevin Wolf, 2018/02/13
- [Qemu-devel] [PULL 45/55] qcow2: Prepare expand_zero_clusters_in_l1() for adding L2 slice support,
Kevin Wolf <=
- [Qemu-devel] [PULL 52/55] qcow2: Allow configuring the L2 slice size, Kevin Wolf, 2018/02/13
- [Qemu-devel] [PULL 48/55] qcow2: Rename l2_table in qcow2_alloc_compressed_cluster_offset(), Kevin Wolf, 2018/02/13
- [Qemu-devel] [PULL 50/55] qcow2: Rename l2_table in count_contiguous_clusters_unallocated(), Kevin Wolf, 2018/02/13
- [Qemu-devel] [PULL 55/55] iotests: Add l2-cache-entry-size to iotest 137, Kevin Wolf, 2018/02/13
- [Qemu-devel] [PULL 53/55] iotests: Test valid values of l2-cache-entry-size, Kevin Wolf, 2018/02/13
- [Qemu-devel] [PULL 49/55] qcow2: Rename l2_table in count_contiguous_clusters(), Kevin Wolf, 2018/02/13
- Re: [Qemu-devel] [PULL 00/55] Block layer patches, Peter Maydell, 2018/02/15