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[Qemu-block] [PATCH v3 23/39] qcow2: Update handle_alloc() to support L2
From: |
Alberto Garcia |
Subject: |
[Qemu-block] [PATCH v3 23/39] qcow2: Update handle_alloc() to support L2 slices |
Date: |
Fri, 26 Jan 2018 16:59:50 +0200 |
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>
Reviewed-by: Eric Blake <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 ac23776b2a..aa374f9928 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -1275,7 +1275,7 @@ 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;
@@ -1288,29 +1288,29 @@ 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
@@ -1339,7 +1339,7 @@ static int handle_alloc(BlockDriverState *bs, uint64_t
guest_offset,
* nb_clusters already to a range of COW clusters */
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;
@@ -1350,7 +1350,7 @@ 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
- Re: [Qemu-block] [PATCH v3 30/39] qcow2: Update expand_zero_clusters_in_l1() to support L2 slices, (continued)
- [Qemu-block] [PATCH v3 21/39] qcow2: Update qcow2_alloc_cluster_link_l2() to support L2 slices, Alberto Garcia, 2018/01/26
- [Qemu-block] [PATCH v3 22/39] qcow2: Update handle_copied() to support L2 slices, Alberto Garcia, 2018/01/26
- [Qemu-block] [PATCH v3 14/39] qcow2: Add offset_to_l2_slice_index(), Alberto Garcia, 2018/01/26
- [Qemu-block] [PATCH v3 24/39] qcow2: Update discard_single_l2() to support L2 slices, Alberto Garcia, 2018/01/26
- [Qemu-block] [PATCH v3 33/39] qcow2: Rename l2_table in count_contiguous_clusters(), Alberto Garcia, 2018/01/26
- [Qemu-block] [PATCH v3 05/39] qcow2: Remove BDS parameter from qcow2_cache_table_release(), Alberto Garcia, 2018/01/26
- [Qemu-block] [PATCH v3 29/39] qcow2: Prepare expand_zero_clusters_in_l1() for adding L2 slice support, Alberto Garcia, 2018/01/26
- [Qemu-block] [PATCH v3 23/39] qcow2: Update handle_alloc() to support L2 slices,
Alberto Garcia <=
- [Qemu-block] [PATCH v3 26/39] qcow2: Prepare qcow2_update_snapshot_refcount() for adding L2 slice support, Alberto Garcia, 2018/01/26