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[Qemu-devel] [PATCH v2 02/32] qcow2: Add table size field to Qcow2Cache
From: |
Alberto Garcia |
Subject: |
[Qemu-devel] [PATCH v2 02/32] qcow2: Add table size field to Qcow2Cache |
Date: |
Fri, 15 Dec 2017 13:53:30 +0100 |
The table size in the qcow2 cache is currently equal to the cluster
size. This doesn't allow us to use the cache memory efficiently,
particularly with large cluster sizes, so we need to be able to have
smaller cache tables that are independent from the cluster size. This
patch adds a new field to Qcow2Cache that we can use instead of the
cluster size.
The current table size is still being initialized to the cluster size,
so there are no semantic changes yet, but this patch will allow us to
prepare the rest of the code and simplify a few function calls.
Signed-off-by: Alberto Garcia <address@hidden>
---
block/qcow2-cache.c | 29 ++++++++++++++---------------
1 file changed, 14 insertions(+), 15 deletions(-)
diff --git a/block/qcow2-cache.c b/block/qcow2-cache.c
index c48ffebd8f..d068fed98e 100644
--- a/block/qcow2-cache.c
+++ b/block/qcow2-cache.c
@@ -39,6 +39,7 @@ struct Qcow2Cache {
Qcow2CachedTable *entries;
struct Qcow2Cache *depends;
int size;
+ int table_size;
bool depends_on_flush;
void *table_array;
uint64_t lru_counter;
@@ -48,17 +49,15 @@ struct Qcow2Cache {
static inline void *qcow2_cache_get_table_addr(BlockDriverState *bs,
Qcow2Cache *c, int table)
{
- BDRVQcow2State *s = bs->opaque;
- return (uint8_t *) c->table_array + (size_t) table * s->cluster_size;
+ return (uint8_t *) c->table_array + (size_t) table * c->table_size;
}
static inline int qcow2_cache_get_table_idx(BlockDriverState *bs,
Qcow2Cache *c, void *table)
{
- BDRVQcow2State *s = bs->opaque;
ptrdiff_t table_offset = (uint8_t *) table - (uint8_t *) c->table_array;
- int idx = table_offset / s->cluster_size;
- assert(idx >= 0 && idx < c->size && table_offset % s->cluster_size == 0);
+ int idx = table_offset / c->table_size;
+ assert(idx >= 0 && idx < c->size && table_offset % c->table_size == 0);
return idx;
}
@@ -79,10 +78,9 @@ static void qcow2_cache_table_release(BlockDriverState *bs,
Qcow2Cache *c,
{
/* Using MADV_DONTNEED to discard memory is a Linux-specific feature */
#ifdef CONFIG_LINUX
- BDRVQcow2State *s = bs->opaque;
void *t = qcow2_cache_get_table_addr(bs, c, i);
int align = getpagesize();
- size_t mem_size = (size_t) s->cluster_size * num_tables;
+ size_t mem_size = (size_t) c->table_size * num_tables;
size_t offset = QEMU_ALIGN_UP((uintptr_t) t, align) - (uintptr_t) t;
size_t length = QEMU_ALIGN_DOWN(mem_size - offset, align);
if (mem_size > offset && length > 0) {
@@ -132,9 +130,10 @@ Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int
num_tables)
c = g_new0(Qcow2Cache, 1);
c->size = num_tables;
+ c->table_size = s->cluster_size;
c->entries = g_try_new0(Qcow2CachedTable, num_tables);
c->table_array = qemu_try_blockalign(bs->file->bs,
- (size_t) num_tables *
s->cluster_size);
+ (size_t) num_tables * c->table_size);
if (!c->entries || !c->table_array) {
qemu_vfree(c->table_array);
@@ -203,13 +202,13 @@ static int qcow2_cache_entry_flush(BlockDriverState *bs,
Qcow2Cache *c, int i)
if (c == s->refcount_block_cache) {
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_REFCOUNT_BLOCK,
- c->entries[i].offset, s->cluster_size);
+ c->entries[i].offset, c->table_size);
} else if (c == s->l2_table_cache) {
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_ACTIVE_L2,
- c->entries[i].offset, s->cluster_size);
+ c->entries[i].offset, c->table_size);
} else {
ret = qcow2_pre_write_overlap_check(bs, 0,
- c->entries[i].offset, s->cluster_size);
+ c->entries[i].offset, c->table_size);
}
if (ret < 0) {
@@ -223,7 +222,7 @@ static int qcow2_cache_entry_flush(BlockDriverState *bs,
Qcow2Cache *c, int i)
}
ret = bdrv_pwrite(bs->file, c->entries[i].offset,
- qcow2_cache_get_table_addr(bs, c, i), s->cluster_size);
+ qcow2_cache_get_table_addr(bs, c, i), c->table_size);
if (ret < 0) {
return ret;
}
@@ -331,7 +330,7 @@ static int qcow2_cache_do_get(BlockDriverState *bs,
Qcow2Cache *c,
trace_qcow2_cache_get(qemu_coroutine_self(), c == s->l2_table_cache,
offset, read_from_disk);
- if (offset_into_cluster(s, offset)) {
+ if (offset & (c->table_size - 1)) {
qcow2_signal_corruption(bs, true, -1, -1, "Cannot get entry from %s "
"cache: Offset %#" PRIx64 " is unaligned",
qcow2_cache_get_name(s, c), offset);
@@ -339,7 +338,7 @@ static int qcow2_cache_do_get(BlockDriverState *bs,
Qcow2Cache *c,
}
/* Check if the table is already cached */
- i = lookup_index = (offset / s->cluster_size * 4) % c->size;
+ i = lookup_index = (offset / c->table_size * 4) % c->size;
do {
const Qcow2CachedTable *t = &c->entries[i];
if (t->offset == offset) {
@@ -380,7 +379,7 @@ static int qcow2_cache_do_get(BlockDriverState *bs,
Qcow2Cache *c,
ret = bdrv_pread(bs->file, offset,
qcow2_cache_get_table_addr(bs, c, i),
- s->cluster_size);
+ c->table_size);
if (ret < 0) {
return ret;
}
--
2.11.0
- [Qemu-devel] [PATCH v2 26/32] qcow2: Update qcow2_truncate() to support L2 slices, (continued)
- [Qemu-devel] [PATCH v2 26/32] qcow2: Update qcow2_truncate() to support L2 slices, Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 15/32] qcow2: Update l2_load() to support L2 slices, Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 08/32] qcow2: Remove BDS parameter from qcow2_cache_destroy(), Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 11/32] qcow2: Remove BDS parameter from qcow2_cache_is_table_offset(), Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 23/32] qcow2: Update zero_single_l2() to support L2 slices, Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 01/32] qcow2: Fix documentation of get_cluster_table(), Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 29/32] qcow2: Rename l2_table in count_contiguous_clusters_unallocated(), Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 28/32] qcow2: Rename l2_table in count_contiguous_clusters(), Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 05/32] qcow2: Remove BDS parameter from qcow2_cache_table_release(), Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 21/32] qcow2: Update handle_alloc() to support L2 slices, Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 02/32] qcow2: Add table size field to Qcow2Cache,
Alberto Garcia <=
- [Qemu-devel] [PATCH v2 06/32] qcow2: Remove BDS parameter from qcow2_cache_entry_mark_dirty(), Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 09/32] qcow2: Remove BDS parameter from qcow2_cache_clean_unused(), Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 27/32] qcow2: Rename l2_table in qcow2_alloc_compressed_cluster_offset(), Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 17/32] qcow2: Update get_cluster_table() to support L2 slices, Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 04/32] qcow2: Remove BDS parameter from qcow2_cache_get_table_idx(), Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 32/32] iotests: Add test for l2-cache-entry-size, Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 24/32] qcow2: Update qcow2_update_snapshot_refcount() to support L2 slices, Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 31/32] qcow2: Allow configuring the L2 slice size, Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 07/32] qcow2: Remove BDS parameter from qcow2_cache_put(), Alberto Garcia, 2017/12/15
- [Qemu-devel] [PATCH v2 25/32] qcow2: Update expand_zero_clusters_in_l1() to support L2 slices, Alberto Garcia, 2017/12/15