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[Qemu-block] [PATCH 21/31] qcow2: Update handle_alloc() to support L2 sl
From: |
Alberto Garcia |
Subject: |
[Qemu-block] [PATCH 21/31] qcow2: Update handle_alloc() to support L2 slices |
Date: |
Thu, 12 Oct 2017 16:05:35 +0300 |
handle_alloc() loads an L2 table and limits the number of checked
clusters to the amount that fits inside that table. Since we'll be
loading L2 slices instead of full tables we need to update that limit.
Apart from that, this function doesn't need any additional changes, so
this patch simply updates the variable name from l2_table to l2_slice.
Signed-off-by: Alberto Garcia <address@hidden>
---
block/qcow2-cluster.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index d74b3b047a..463b24a4fd 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -1274,7 +1274,7 @@ static int handle_alloc(BlockDriverState *bs, uint64_t
guest_offset,
{
BDRVQcow2State *s = bs->opaque;
int l2_index;
- uint64_t *l2_table;
+ uint64_t *l2_slice;
uint64_t entry;
uint64_t nb_clusters;
int ret;
@@ -1287,29 +1287,29 @@ static int handle_alloc(BlockDriverState *bs, uint64_t
guest_offset,
assert(*bytes > 0);
/*
- * Calculate the number of clusters to look for. We stop at L2 table
+ * Calculate the number of clusters to look for. We stop at L2 slice
* boundaries to keep things simple.
*/
nb_clusters =
size_to_clusters(s, offset_into_cluster(s, guest_offset) + *bytes);
- l2_index = offset_to_l2_index(s, guest_offset);
- nb_clusters = MIN(nb_clusters, s->l2_size - l2_index);
+ l2_index = offset_to_l2_slice_index(s, guest_offset);
+ nb_clusters = MIN(nb_clusters, s->l2_slice_size - l2_index);
assert(nb_clusters <= INT_MAX);
/* Find L2 entry for the first involved cluster */
- ret = get_cluster_table(bs, guest_offset, &l2_table, &l2_index);
+ ret = get_cluster_table(bs, guest_offset, &l2_slice, &l2_index);
if (ret < 0) {
return ret;
}
- entry = be64_to_cpu(l2_table[l2_index]);
+ entry = be64_to_cpu(l2_slice[l2_index]);
/* For the moment, overwrite compressed clusters one by one */
if (entry & QCOW_OFLAG_COMPRESSED) {
nb_clusters = 1;
} else {
- nb_clusters = count_cow_clusters(s, nb_clusters, l2_table, l2_index);
+ nb_clusters = count_cow_clusters(s, nb_clusters, l2_slice, l2_index);
}
/* This function is only called when there were no non-COW clusters, so if
@@ -1327,7 +1327,7 @@ static int handle_alloc(BlockDriverState *bs, uint64_t
guest_offset,
* nb_clusters already to a range of COW clusters */
int preallocated_nb_clusters =
count_contiguous_clusters(nb_clusters, s->cluster_size,
- &l2_table[l2_index], QCOW_OFLAG_COPIED);
+ &l2_slice[l2_index], QCOW_OFLAG_COPIED);
assert(preallocated_nb_clusters > 0);
nb_clusters = preallocated_nb_clusters;
@@ -1338,7 +1338,7 @@ static int handle_alloc(BlockDriverState *bs, uint64_t
guest_offset,
keep_old_clusters = true;
}
- qcow2_cache_put(s->l2_table_cache, (void **) &l2_table);
+ qcow2_cache_put(s->l2_table_cache, (void **) &l2_slice);
if (!alloc_cluster_offset) {
/* Allocate, if necessary at a given offset in the image file */
--
2.11.0
- [Qemu-block] [PATCH 02/31] qcow2: Add table size field to Qcow2Cache, (continued)
- [Qemu-block] [PATCH 02/31] qcow2: Add table size field to Qcow2Cache, Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 31/31] qcow2: Allow configuring the L2 slice size, Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 27/31] qcow2: Rename l2_table in qcow2_alloc_compressed_cluster_offset(), Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 30/31] qcow2: Rename l2_table in count_cow_clusters(), Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 26/31] qcow2: Update qcow2_truncate() to support L2 slices, Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 29/31] qcow2: Rename l2_table in count_contiguous_clusters_unallocated(), Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 25/31] qcow2: Update expand_zero_clusters_in_l1() to support L2 slices, Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 24/31] qcow2: Update qcow2_update_snapshot_refcount() to support L2 slices, Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 23/31] qcow2: Update zero_single_l2() to support L2 slices, Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 22/31] qcow2: Update discard_single_l2() to support L2 slices, Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 21/31] qcow2: Update handle_alloc() to support L2 slices,
Alberto Garcia <=
- [Qemu-block] [PATCH 19/31] qcow2: Update qcow2_alloc_cluster_link_l2() to support L2 slices, Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 20/31] qcow2: Update handle_copied() to support L2 slices, Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 18/31] qcow2: Update qcow2_get_cluster_offset() to support L2 slices, Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 08/31] qcow2: Remove BDS parameter from qcow2_cache_destroy(), Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 10/31] qcow2: Remove BDS parameter from qcow2_cache_discard(), Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 12/31] qcow2: Add offset_to_l1_index(), Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 07/31] qcow2: Remove BDS parameter from qcow2_cache_put(), Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 16/31] qcow2: Update l2_allocate() to support L2 slices, Alberto Garcia, 2017/10/12
- [Qemu-block] [PATCH 11/31] qcow2: Remove BDS parameter from qcow2_cache_is_table_offset(), Alberto Garcia, 2017/10/12