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Re: [Qemu-devel] [PATCH V12 4/6] rename qcow2-cache.c to block-cache.c
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From: |
Dong Xu Wang |
|
Subject: |
Re: [Qemu-devel] [PATCH V12 4/6] rename qcow2-cache.c to block-cache.c |
|
Date: |
Mon, 10 Sep 2012 10:14:37 +0800 |
On Fri, Sep 7, 2012 at 1:52 AM, Michael Roth <address@hidden> wrote:
> On Fri, Aug 10, 2012 at 11:39:43PM +0800, Dong Xu Wang wrote:
>> add-cow and qcow2 file format will share the same cache code, so rename
>> block-cache.c to block-cache.c. And related structure and qcow2 code also
>
> "qcow2-cache.c to block-cache.c"
>
> But I've scanned through the rest of your patches and can't seem to find
> where block-cache.c gets introduced. Did you forget to git add it?
Really sorry for that, I forget to add the block-cache.c, will add it in v13.
>
>> are changed.
>>
>> Signed-off-by: Dong Xu Wang <address@hidden>
>> ---
>> block.h | 3 +
>> block/Makefile.objs | 3 +-
>> block/qcow2-cache.c | 323
>> ------------------------------------------------
>> block/qcow2-cluster.c | 66 ++++++----
>> block/qcow2-refcount.c | 66 ++++++-----
>> block/qcow2.c | 36 +++---
>> block/qcow2.h | 24 +---
>> trace-events | 13 +-
>> 8 files changed, 109 insertions(+), 425 deletions(-)
>> delete mode 100644 block/qcow2-cache.c
>>
>> diff --git a/block.h b/block.h
>> index e5dfcd7..c325661 100644
>> --- a/block.h
>> +++ b/block.h
>> @@ -401,6 +401,9 @@ typedef enum {
>> BLKDBG_CLUSTER_ALLOC_BYTES,
>> BLKDBG_CLUSTER_FREE,
>>
>> + BLKDBG_ADD_COW_UPDATE,
>> + BLKDBG_ADD_COW_LOAD,
>> +
>> BLKDBG_EVENT_MAX,
>> } BlkDebugEvent;
>>
>> diff --git a/block/Makefile.objs b/block/Makefile.objs
>> index b5754d3..23bdfc8 100644
>> --- a/block/Makefile.objs
>> +++ b/block/Makefile.objs
>> @@ -1,7 +1,8 @@
>> block-obj-y += raw.o cow.o qcow.o vdi.o vmdk.o cloop.o dmg.o bochs.o vpc.o
>> vvfat.o
>> -block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o
>> qcow2-cache.o
>> +block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o
>> block-obj-y += qed.o qed-gencb.o qed-l2-cache.o qed-table.o qed-cluster.o
>> block-obj-y += qed-check.o
>> +block-obj-y += block-cache.o
>> block-obj-y += parallels.o nbd.o blkdebug.o sheepdog.o blkverify.o
>> block-obj-y += stream.o
>> block-obj-$(CONFIG_WIN32) += raw-win32.o
>> diff --git a/block/qcow2-cache.c b/block/qcow2-cache.c
>> deleted file mode 100644
>> index 2d4322a..0000000
>> --- a/block/qcow2-cache.c
>> +++ /dev/null
>> @@ -1,323 +0,0 @@
>> -/*
>> - * L2/refcount table cache for the QCOW2 format
>> - *
>> - * Copyright (c) 2010 Kevin Wolf <address@hidden>
>> - *
>> - * Permission is hereby granted, free of charge, to any person obtaining a
>> copy
>> - * of this software and associated documentation files (the "Software"), to
>> deal
>> - * in the Software without restriction, including without limitation the
>> rights
>> - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
>> - * copies of the Software, and to permit persons to whom the Software is
>> - * furnished to do so, subject to the following conditions:
>> - *
>> - * The above copyright notice and this permission notice shall be included
>> in
>> - * all copies or substantial portions of the Software.
>> - *
>> - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
>> OR
>> - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
>> - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
>> - * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
>> OTHER
>> - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
>> FROM,
>> - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
>> - * THE SOFTWARE.
>> - */
>> -
>> -#include "block_int.h"
>> -#include "qemu-common.h"
>> -#include "qcow2.h"
>> -#include "trace.h"
>> -
>> -typedef struct Qcow2CachedTable {
>> - void* table;
>> - int64_t offset;
>> - bool dirty;
>> - int cache_hits;
>> - int ref;
>> -} Qcow2CachedTable;
>> -
>> -struct Qcow2Cache {
>> - Qcow2CachedTable* entries;
>> - struct Qcow2Cache* depends;
>> - int size;
>> - bool depends_on_flush;
>> -};
>> -
>> -Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables)
>> -{
>> - BDRVQcowState *s = bs->opaque;
>> - Qcow2Cache *c;
>> - int i;
>> -
>> - c = g_malloc0(sizeof(*c));
>> - c->size = num_tables;
>> - c->entries = g_malloc0(sizeof(*c->entries) * num_tables);
>> -
>> - for (i = 0; i < c->size; i++) {
>> - c->entries[i].table = qemu_blockalign(bs, s->cluster_size);
>> - }
>> -
>> - return c;
>> -}
>> -
>> -int qcow2_cache_destroy(BlockDriverState* bs, Qcow2Cache *c)
>> -{
>> - int i;
>> -
>> - for (i = 0; i < c->size; i++) {
>> - assert(c->entries[i].ref == 0);
>> - qemu_vfree(c->entries[i].table);
>> - }
>> -
>> - g_free(c->entries);
>> - g_free(c);
>> -
>> - return 0;
>> -}
>> -
>> -static int qcow2_cache_flush_dependency(BlockDriverState *bs, Qcow2Cache *c)
>> -{
>> - int ret;
>> -
>> - ret = qcow2_cache_flush(bs, c->depends);
>> - if (ret < 0) {
>> - return ret;
>> - }
>> -
>> - c->depends = NULL;
>> - c->depends_on_flush = false;
>> -
>> - return 0;
>> -}
>> -
>> -static int qcow2_cache_entry_flush(BlockDriverState *bs, Qcow2Cache *c, int
>> i)
>> -{
>> - BDRVQcowState *s = bs->opaque;
>> - int ret = 0;
>> -
>> - if (!c->entries[i].dirty || !c->entries[i].offset) {
>> - return 0;
>> - }
>> -
>> - trace_qcow2_cache_entry_flush(qemu_coroutine_self(),
>> - c == s->l2_table_cache, i);
>> -
>> - if (c->depends) {
>> - ret = qcow2_cache_flush_dependency(bs, c);
>> - } else if (c->depends_on_flush) {
>> - ret = bdrv_flush(bs->file);
>> - if (ret >= 0) {
>> - c->depends_on_flush = false;
>> - }
>> - }
>> -
>> - if (ret < 0) {
>> - return ret;
>> - }
>> -
>> - if (c == s->refcount_block_cache) {
>> - BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_UPDATE_PART);
>> - } else if (c == s->l2_table_cache) {
>> - BLKDBG_EVENT(bs->file, BLKDBG_L2_UPDATE);
>> - }
>> -
>> - ret = bdrv_pwrite(bs->file, c->entries[i].offset, c->entries[i].table,
>> - s->cluster_size);
>> - if (ret < 0) {
>> - return ret;
>> - }
>> -
>> - c->entries[i].dirty = false;
>> -
>> - return 0;
>> -}
>> -
>> -int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c)
>> -{
>> - BDRVQcowState *s = bs->opaque;
>> - int result = 0;
>> - int ret;
>> - int i;
>> -
>> - trace_qcow2_cache_flush(qemu_coroutine_self(), c == s->l2_table_cache);
>> -
>> - for (i = 0; i < c->size; i++) {
>> - ret = qcow2_cache_entry_flush(bs, c, i);
>> - if (ret < 0 && result != -ENOSPC) {
>> - result = ret;
>> - }
>> - }
>> -
>> - if (result == 0) {
>> - ret = bdrv_flush(bs->file);
>> - if (ret < 0) {
>> - result = ret;
>> - }
>> - }
>> -
>> - return result;
>> -}
>> -
>> -int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c,
>> - Qcow2Cache *dependency)
>> -{
>> - int ret;
>> -
>> - if (dependency->depends) {
>> - ret = qcow2_cache_flush_dependency(bs, dependency);
>> - if (ret < 0) {
>> - return ret;
>> - }
>> - }
>> -
>> - if (c->depends && (c->depends != dependency)) {
>> - ret = qcow2_cache_flush_dependency(bs, c);
>> - if (ret < 0) {
>> - return ret;
>> - }
>> - }
>> -
>> - c->depends = dependency;
>> - return 0;
>> -}
>> -
>> -void qcow2_cache_depends_on_flush(Qcow2Cache *c)
>> -{
>> - c->depends_on_flush = true;
>> -}
>> -
>> -static int qcow2_cache_find_entry_to_replace(Qcow2Cache *c)
>> -{
>> - int i;
>> - int min_count = INT_MAX;
>> - int min_index = -1;
>> -
>> -
>> - for (i = 0; i < c->size; i++) {
>> - if (c->entries[i].ref) {
>> - continue;
>> - }
>> -
>> - if (c->entries[i].cache_hits < min_count) {
>> - min_index = i;
>> - min_count = c->entries[i].cache_hits;
>> - }
>> -
>> - /* Give newer hits priority */
>> - /* TODO Check how to optimize the replacement strategy */
>> - c->entries[i].cache_hits /= 2;
>> - }
>> -
>> - if (min_index == -1) {
>> - /* This can't happen in current synchronous code, but leave the
>> check
>> - * here as a reminder for whoever starts using AIO with the cache */
>> - abort();
>> - }
>> - return min_index;
>> -}
>> -
>> -static int qcow2_cache_do_get(BlockDriverState *bs, Qcow2Cache *c,
>> - uint64_t offset, void **table, bool read_from_disk)
>> -{
>> - BDRVQcowState *s = bs->opaque;
>> - int i;
>> - int ret;
>> -
>> - trace_qcow2_cache_get(qemu_coroutine_self(), c == s->l2_table_cache,
>> - offset, read_from_disk);
>> -
>> - /* Check if the table is already cached */
>> - for (i = 0; i < c->size; i++) {
>> - if (c->entries[i].offset == offset) {
>> - goto found;
>> - }
>> - }
>> -
>> - /* If not, write a table back and replace it */
>> - i = qcow2_cache_find_entry_to_replace(c);
>> - trace_qcow2_cache_get_replace_entry(qemu_coroutine_self(),
>> - c == s->l2_table_cache, i);
>> - if (i < 0) {
>> - return i;
>> - }
>> -
>> - ret = qcow2_cache_entry_flush(bs, c, i);
>> - if (ret < 0) {
>> - return ret;
>> - }
>> -
>> - trace_qcow2_cache_get_read(qemu_coroutine_self(),
>> - c == s->l2_table_cache, i);
>> - c->entries[i].offset = 0;
>> - if (read_from_disk) {
>> - if (c == s->l2_table_cache) {
>> - BLKDBG_EVENT(bs->file, BLKDBG_L2_LOAD);
>> - }
>> -
>> - ret = bdrv_pread(bs->file, offset, c->entries[i].table,
>> s->cluster_size);
>> - if (ret < 0) {
>> - return ret;
>> - }
>> - }
>> -
>> - /* Give the table some hits for the start so that it won't be replaced
>> - * immediately. The number 32 is completely arbitrary. */
>> - c->entries[i].cache_hits = 32;
>> - c->entries[i].offset = offset;
>> -
>> - /* And return the right table */
>> -found:
>> - c->entries[i].cache_hits++;
>> - c->entries[i].ref++;
>> - *table = c->entries[i].table;
>> -
>> - trace_qcow2_cache_get_done(qemu_coroutine_self(),
>> - c == s->l2_table_cache, i);
>> -
>> - return 0;
>> -}
>> -
>> -int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
>> - void **table)
>> -{
>> - return qcow2_cache_do_get(bs, c, offset, table, true);
>> -}
>> -
>> -int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t
>> offset,
>> - void **table)
>> -{
>> - return qcow2_cache_do_get(bs, c, offset, table, false);
>> -}
>> -
>> -int qcow2_cache_put(BlockDriverState *bs, Qcow2Cache *c, void **table)
>> -{
>> - int i;
>> -
>> - for (i = 0; i < c->size; i++) {
>> - if (c->entries[i].table == *table) {
>> - goto found;
>> - }
>> - }
>> - return -ENOENT;
>> -
>> -found:
>> - c->entries[i].ref--;
>> - *table = NULL;
>> -
>> - assert(c->entries[i].ref >= 0);
>> - return 0;
>> -}
>> -
>> -void qcow2_cache_entry_mark_dirty(Qcow2Cache *c, void *table)
>> -{
>> - int i;
>> -
>> - for (i = 0; i < c->size; i++) {
>> - if (c->entries[i].table == table) {
>> - goto found;
>> - }
>> - }
>> - abort();
>> -
>> -found:
>> - c->entries[i].dirty = true;
>> -}
>> diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
>> index e179211..335dc7a 100644
>> --- a/block/qcow2-cluster.c
>> +++ b/block/qcow2-cluster.c
>> @@ -28,6 +28,7 @@
>> #include "block_int.h"
>> #include "block/qcow2.h"
>> #include "trace.h"
>> +#include "block-cache.h"
>>
>> int qcow2_grow_l1_table(BlockDriverState *bs, int min_size, bool exact_size)
>> {
>> @@ -69,7 +70,8 @@ int qcow2_grow_l1_table(BlockDriverState *bs, int
>> min_size, bool exact_size)
>> return new_l1_table_offset;
>> }
>>
>> - ret = qcow2_cache_flush(bs, s->refcount_block_cache);
>> + ret = block_cache_flush(bs, s->refcount_block_cache,
>> + BLOCK_TABLE_REF, s->cluster_size);
>> if (ret < 0) {
>> goto fail;
>> }
>> @@ -119,7 +121,8 @@ static int l2_load(BlockDriverState *bs, uint64_t
>> l2_offset,
>> BDRVQcowState *s = bs->opaque;
>> int ret;
>>
>> - ret = qcow2_cache_get(bs, s->l2_table_cache, l2_offset, (void**)
>> l2_table);
>> + ret = block_cache_get(bs, s->l2_table_cache, l2_offset,
>> + (void **) l2_table, BLOCK_TABLE_L2, s->cluster_size);
>>
>> return ret;
>> }
>> @@ -180,7 +183,8 @@ static int l2_allocate(BlockDriverState *bs, int
>> l1_index, uint64_t **table)
>> return l2_offset;
>> }
>>
>> - ret = qcow2_cache_flush(bs, s->refcount_block_cache);
>> + ret = block_cache_flush(bs, s->refcount_block_cache,
>> + BLOCK_TABLE_REF, s->cluster_size);
>> if (ret < 0) {
>> goto fail;
>> }
>> @@ -188,7 +192,8 @@ static int l2_allocate(BlockDriverState *bs, int
>> l1_index, uint64_t **table)
>> /* allocate a new entry in the l2 cache */
>>
>> trace_qcow2_l2_allocate_get_empty(bs, l1_index);
>> - ret = qcow2_cache_get_empty(bs, s->l2_table_cache, l2_offset, (void**)
>> table);
>> + ret = block_cache_get_empty(bs, s->l2_table_cache, l2_offset,
>> + (void **) table, BLOCK_TABLE_L2, s->cluster_size);
>> if (ret < 0) {
>> return ret;
>> }
>> @@ -203,16 +208,17 @@ static int l2_allocate(BlockDriverState *bs, int
>> l1_index, uint64_t **table)
>>
>> /* if there was an old l2 table, read it from the disk */
>> BLKDBG_EVENT(bs->file, BLKDBG_L2_ALLOC_COW_READ);
>> - ret = qcow2_cache_get(bs, s->l2_table_cache,
>> + ret = block_cache_get(bs, s->l2_table_cache,
>> old_l2_offset & L1E_OFFSET_MASK,
>> - (void**) &old_table);
>> + (void **) &old_table, BLOCK_TABLE_L2, s->cluster_size);
>> if (ret < 0) {
>> goto fail;
>> }
>>
>> memcpy(l2_table, old_table, s->cluster_size);
>>
>> - ret = qcow2_cache_put(bs, s->l2_table_cache, (void**) &old_table);
>> + ret = block_cache_put(bs, s->l2_table_cache,
>> + (void **) &old_table, BLOCK_TABLE_L2);
>> if (ret < 0) {
>> goto fail;
>> }
>> @@ -222,8 +228,9 @@ static int l2_allocate(BlockDriverState *bs, int
>> l1_index, uint64_t **table)
>> BLKDBG_EVENT(bs->file, BLKDBG_L2_ALLOC_WRITE);
>>
>> trace_qcow2_l2_allocate_write_l2(bs, l1_index);
>> - qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_table);
>> - ret = qcow2_cache_flush(bs, s->l2_table_cache);
>> + block_cache_entry_mark_dirty(s->l2_table_cache, l2_table);
>> + ret = block_cache_flush(bs, s->l2_table_cache,
>> + BLOCK_TABLE_L2, s->cluster_size);
>> if (ret < 0) {
>> goto fail;
>> }
>> @@ -242,7 +249,7 @@ static int l2_allocate(BlockDriverState *bs, int
>> l1_index, uint64_t **table)
>>
>> fail:
>> trace_qcow2_l2_allocate_done(bs, l1_index, ret);
>> - qcow2_cache_put(bs, s->l2_table_cache, (void**) table);
>> + block_cache_put(bs, s->l2_table_cache, (void **) table, BLOCK_TABLE_L2);
>> s->l1_table[l1_index] = old_l2_offset;
>> return ret;
>> }
>> @@ -475,7 +482,7 @@ int qcow2_get_cluster_offset(BlockDriverState *bs,
>> uint64_t offset,
>> abort();
>> }
>>
>> - qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table);
>> + block_cache_put(bs, s->l2_table_cache, (void **) &l2_table,
>> BLOCK_TABLE_L2);
>>
>> nb_available = (c * s->cluster_sectors);
>>
>> @@ -584,13 +591,15 @@ uint64_t
>> qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
>> * allocated. */
>> cluster_offset = be64_to_cpu(l2_table[l2_index]);
>> if (cluster_offset & L2E_OFFSET_MASK) {
>> - qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table);
>> + block_cache_put(bs, s->l2_table_cache,
>> + (void **) &l2_table, BLOCK_TABLE_L2);
>> return 0;
>> }
>>
>> cluster_offset = qcow2_alloc_bytes(bs, compressed_size);
>> if (cluster_offset < 0) {
>> - qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table);
>> + block_cache_put(bs, s->l2_table_cache,
>> + (void **) &l2_table, BLOCK_TABLE_L2);
>> return 0;
>> }
>>
>> @@ -605,9 +614,10 @@ uint64_t
>> qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
>> /* compressed clusters never have the copied flag */
>>
>> BLKDBG_EVENT(bs->file, BLKDBG_L2_UPDATE_COMPRESSED);
>> - qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_table);
>> + block_cache_entry_mark_dirty(s->l2_table_cache, l2_table);
>> l2_table[l2_index] = cpu_to_be64(cluster_offset);
>> - ret = qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table);
>> + ret = block_cache_put(bs, s->l2_table_cache,
>> + (void **) &l2_table, BLOCK_TABLE_L2);
>> if (ret < 0) {
>> return 0;
>> }
>> @@ -659,18 +669,16 @@ int qcow2_alloc_cluster_link_l2(BlockDriverState *bs,
>> QCowL2Meta *m)
>> * handled.
>> */
>> if (cow) {
>> - qcow2_cache_depends_on_flush(s->l2_table_cache);
>> + block_cache_depends_on_flush(s->l2_table_cache);
>> }
>>
>> - if (qcow2_need_accurate_refcounts(s)) {
>> - qcow2_cache_set_dependency(bs, s->l2_table_cache,
>> - s->refcount_block_cache);
>> - }
>> + block_cache_set_dependency(bs, s->l2_table_cache, BLOCK_TABLE_L2,
>> + s->refcount_block_cache, s->cluster_size);
>> ret = get_cluster_table(bs, m->offset, &l2_table, &l2_index);
>> if (ret < 0) {
>> goto err;
>> }
>> - qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_table);
>> + block_cache_entry_mark_dirty(s->l2_table_cache, l2_table);
>>
>> for (i = 0; i < m->nb_clusters; i++) {
>> /* if two concurrent writes happen to the same unallocated cluster
>> @@ -687,7 +695,8 @@ int qcow2_alloc_cluster_link_l2(BlockDriverState *bs,
>> QCowL2Meta *m)
>> }
>>
>>
>> - ret = qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table);
>> + ret = block_cache_put(bs, s->l2_table_cache,
>> + (void **) &l2_table, BLOCK_TABLE_L2);
>> if (ret < 0) {
>> goto err;
>> }
>> @@ -913,7 +922,8 @@ again:
>> * request to complete. If we still had the reference, we could use up
>> the
>> * whole cache with sleeping requests.
>> */
>> - ret = qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table);
>> + ret = block_cache_put(bs, s->l2_table_cache,
>> + (void **) &l2_table, BLOCK_TABLE_L2);
>> if (ret < 0) {
>> return ret;
>> }
>> @@ -1077,14 +1087,15 @@ static int discard_single_l2(BlockDriverState *bs,
>> uint64_t offset,
>> }
>>
>> /* First remove L2 entries */
>> - qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_table);
>> + block_cache_entry_mark_dirty(s->l2_table_cache, l2_table);
>> l2_table[l2_index + i] = cpu_to_be64(0);
>>
>> /* Then decrease the refcount */
>> qcow2_free_any_clusters(bs, old_offset, 1);
>> }
>>
>> - ret = qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table);
>> + ret = block_cache_put(bs, s->l2_table_cache,
>> + (void **) &l2_table, BLOCK_TABLE_L2);
>> if (ret < 0) {
>> return ret;
>> }
>> @@ -1154,7 +1165,7 @@ static int zero_single_l2(BlockDriverState *bs,
>> uint64_t offset,
>> old_offset = be64_to_cpu(l2_table[l2_index + i]);
>>
>> /* Update L2 entries */
>> - qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_table);
>> + block_cache_entry_mark_dirty(s->l2_table_cache, l2_table);
>> if (old_offset & QCOW_OFLAG_COMPRESSED) {
>> l2_table[l2_index + i] = cpu_to_be64(QCOW_OFLAG_ZERO);
>> qcow2_free_any_clusters(bs, old_offset, 1);
>> @@ -1163,7 +1174,8 @@ static int zero_single_l2(BlockDriverState *bs,
>> uint64_t offset,
>> }
>> }
>>
>> - ret = qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table);
>> + ret = block_cache_put(bs, s->l2_table_cache,
>> + (void **) &l2_table, BLOCK_TABLE_L2);
>> if (ret < 0) {
>> return ret;
>> }
>> diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
>> index 5e3f915..728bfc1 100644
>> --- a/block/qcow2-refcount.c
>> +++ b/block/qcow2-refcount.c
>> @@ -25,6 +25,7 @@
>> #include "qemu-common.h"
>> #include "block_int.h"
>> #include "block/qcow2.h"
>> +#include "block-cache.h"
>>
>> static int64_t alloc_clusters_noref(BlockDriverState *bs, int64_t size);
>> static int QEMU_WARN_UNUSED_RESULT update_refcount(BlockDriverState *bs,
>> @@ -71,8 +72,8 @@ static int load_refcount_block(BlockDriverState *bs,
>> int ret;
>>
>> BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_LOAD);
>> - ret = qcow2_cache_get(bs, s->refcount_block_cache,
>> refcount_block_offset,
>> - refcount_block);
>> + ret = block_cache_get(bs, s->refcount_block_cache,
>> refcount_block_offset,
>> + refcount_block, BLOCK_TABLE_REF, s->cluster_size);
>>
>> return ret;
>> }
>> @@ -98,8 +99,8 @@ static int get_refcount(BlockDriverState *bs, int64_t
>> cluster_index)
>> if (!refcount_block_offset)
>> return 0;
>>
>> - ret = qcow2_cache_get(bs, s->refcount_block_cache,
>> refcount_block_offset,
>> - (void**) &refcount_block);
>> + ret = block_cache_get(bs, s->refcount_block_cache,
>> refcount_block_offset,
>> + (void **) &refcount_block, BLOCK_TABLE_REF, s->cluster_size);
>> if (ret < 0) {
>> return ret;
>> }
>> @@ -108,8 +109,8 @@ static int get_refcount(BlockDriverState *bs, int64_t
>> cluster_index)
>> ((1 << (s->cluster_bits - REFCOUNT_SHIFT)) - 1);
>> refcount = be16_to_cpu(refcount_block[block_index]);
>>
>> - ret = qcow2_cache_put(bs, s->refcount_block_cache,
>> - (void**) &refcount_block);
>> + ret = block_cache_put(bs, s->refcount_block_cache,
>> + (void **) &refcount_block, BLOCK_TABLE_REF);
>> if (ret < 0) {
>> return ret;
>> }
>> @@ -201,7 +202,8 @@ static int alloc_refcount_block(BlockDriverState *bs,
>> *refcount_block = NULL;
>>
>> /* We write to the refcount table, so we might depend on L2 tables */
>> - qcow2_cache_flush(bs, s->l2_table_cache);
>> + block_cache_flush(bs, s->l2_table_cache,
>> + BLOCK_TABLE_L2, s->cluster_size);
>>
>> /* Allocate the refcount block itself and mark it as used */
>> int64_t new_block = alloc_clusters_noref(bs, s->cluster_size);
>> @@ -217,8 +219,8 @@ static int alloc_refcount_block(BlockDriverState *bs,
>>
>> if (in_same_refcount_block(s, new_block, cluster_index <<
>> s->cluster_bits)) {
>> /* Zero the new refcount block before updating it */
>> - ret = qcow2_cache_get_empty(bs, s->refcount_block_cache, new_block,
>> - (void**) refcount_block);
>> + ret = block_cache_get_empty(bs, s->refcount_block_cache, new_block,
>> + (void **) refcount_block, BLOCK_TABLE_REF, s->cluster_size);
>> if (ret < 0) {
>> goto fail_block;
>> }
>> @@ -241,8 +243,8 @@ static int alloc_refcount_block(BlockDriverState *bs,
>>
>> /* Initialize the new refcount block only after updating its
>> refcount,
>> * update_refcount uses the refcount cache itself */
>> - ret = qcow2_cache_get_empty(bs, s->refcount_block_cache, new_block,
>> - (void**) refcount_block);
>> + ret = block_cache_get_empty(bs, s->refcount_block_cache, new_block,
>> + (void **) refcount_block, BLOCK_TABLE_REF, s->cluster_size);
>> if (ret < 0) {
>> goto fail_block;
>> }
>> @@ -252,8 +254,9 @@ static int alloc_refcount_block(BlockDriverState *bs,
>>
>> /* Now the new refcount block needs to be written to disk */
>> BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC_WRITE);
>> - qcow2_cache_entry_mark_dirty(s->refcount_block_cache, *refcount_block);
>> - ret = qcow2_cache_flush(bs, s->refcount_block_cache);
>> + block_cache_entry_mark_dirty(s->refcount_block_cache, *refcount_block);
>> + ret = block_cache_flush(bs, s->refcount_block_cache,
>> + BLOCK_TABLE_REF, s->cluster_size);
>> if (ret < 0) {
>> goto fail_block;
>> }
>> @@ -273,7 +276,8 @@ static int alloc_refcount_block(BlockDriverState *bs,
>> return 0;
>> }
>>
>> - ret = qcow2_cache_put(bs, s->refcount_block_cache, (void**)
>> refcount_block);
>> + ret = block_cache_put(bs, s->refcount_block_cache,
>> + (void **) refcount_block, BLOCK_TABLE_REF);
>> if (ret < 0) {
>> goto fail_block;
>> }
>> @@ -406,7 +410,8 @@ fail_table:
>> g_free(new_table);
>> fail_block:
>> if (*refcount_block != NULL) {
>> - qcow2_cache_put(bs, s->refcount_block_cache, (void**)
>> refcount_block);
>> + block_cache_put(bs, s->refcount_block_cache,
>> + (void **) refcount_block, BLOCK_TABLE_REF);
>> }
>> return ret;
>> }
>> @@ -432,8 +437,8 @@ static int QEMU_WARN_UNUSED_RESULT
>> update_refcount(BlockDriverState *bs,
>> }
>>
>> if (addend < 0) {
>> - qcow2_cache_set_dependency(bs, s->refcount_block_cache,
>> - s->l2_table_cache);
>> + block_cache_set_dependency(bs, s->refcount_block_cache,
>> BLOCK_TABLE_REF,
>> + s->l2_table_cache, s->cluster_size);
>> }
>>
>> start = offset & ~(s->cluster_size - 1);
>> @@ -449,8 +454,8 @@ static int QEMU_WARN_UNUSED_RESULT
>> update_refcount(BlockDriverState *bs,
>> /* Load the refcount block and allocate it if needed */
>> if (table_index != old_table_index) {
>> if (refcount_block) {
>> - ret = qcow2_cache_put(bs, s->refcount_block_cache,
>> - (void**) &refcount_block);
>> + ret = block_cache_put(bs, s->refcount_block_cache,
>> + (void **) &refcount_block, BLOCK_TABLE_REF);
>> if (ret < 0) {
>> goto fail;
>> }
>> @@ -463,7 +468,7 @@ static int QEMU_WARN_UNUSED_RESULT
>> update_refcount(BlockDriverState *bs,
>> }
>> old_table_index = table_index;
>>
>> - qcow2_cache_entry_mark_dirty(s->refcount_block_cache,
>> refcount_block);
>> + block_cache_entry_mark_dirty(s->refcount_block_cache,
>> refcount_block);
>>
>> /* we can update the count and save it */
>> block_index = cluster_index &
>> @@ -486,8 +491,8 @@ fail:
>> /* Write last changed block to disk */
>> if (refcount_block) {
>> int wret;
>> - wret = qcow2_cache_put(bs, s->refcount_block_cache,
>> - (void**) &refcount_block);
>> + wret = block_cache_put(bs, s->refcount_block_cache,
>> + (void **) &refcount_block, BLOCK_TABLE_REF);
>> if (wret < 0) {
>> return ret < 0 ? ret : wret;
>> }
>> @@ -763,8 +768,8 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
>> old_l2_offset = l2_offset;
>> l2_offset &= L1E_OFFSET_MASK;
>>
>> - ret = qcow2_cache_get(bs, s->l2_table_cache, l2_offset,
>> - (void**) &l2_table);
>> + ret = block_cache_get(bs, s->l2_table_cache, l2_offset,
>> + (void **) &l2_table, BLOCK_TABLE_L2, s->cluster_size);
>> if (ret < 0) {
>> goto fail;
>> }
>> @@ -811,16 +816,18 @@ int qcow2_update_snapshot_refcount(BlockDriverState
>> *bs,
>> }
>> if (offset != old_offset) {
>> if (addend > 0) {
>> - qcow2_cache_set_dependency(bs,
>> s->l2_table_cache,
>> - s->refcount_block_cache);
>> + block_cache_set_dependency(bs,
>> s->l2_table_cache,
>> + BLOCK_TABLE_L2, s->refcount_block_cache,
>> + s->cluster_size);
>> }
>> l2_table[j] = cpu_to_be64(offset);
>> - qcow2_cache_entry_mark_dirty(s->l2_table_cache,
>> l2_table);
>> + block_cache_entry_mark_dirty(s->l2_table_cache,
>> l2_table);
>> }
>> }
>> }
>>
>> - ret = qcow2_cache_put(bs, s->l2_table_cache, (void**)
>> &l2_table);
>> + ret = block_cache_put(bs, s->l2_table_cache,
>> + (void **) &l2_table, BLOCK_TABLE_L2);
>> if (ret < 0) {
>> goto fail;
>> }
>> @@ -847,7 +854,8 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
>> ret = 0;
>> fail:
>> if (l2_table) {
>> - qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table);
>> + block_cache_put(bs, s->l2_table_cache,
>> + (void **) &l2_table, BLOCK_TABLE_L2);
>> }
>>
>> /* Update L1 only if it isn't deleted anyway (addend = -1) */
>> diff --git a/block/qcow2.c b/block/qcow2.c
>> index fd5e214..b89d312 100644
>> --- a/block/qcow2.c
>> +++ b/block/qcow2.c
>> @@ -30,6 +30,7 @@
>> #include "qemu-error.h"
>> #include "qerror.h"
>> #include "trace.h"
>> +#include "block-cache.h"
>>
>> /*
>> Differences with QCOW:
>> @@ -415,8 +416,9 @@ static int qcow2_open(BlockDriverState *bs, int flags)
>> }
>>
>> /* alloc L2 table/refcount block cache */
>> - s->l2_table_cache = qcow2_cache_create(bs, L2_CACHE_SIZE);
>> - s->refcount_block_cache = qcow2_cache_create(bs, REFCOUNT_CACHE_SIZE);
>> + s->l2_table_cache = block_cache_create(bs, L2_CACHE_SIZE,
>> s->cluster_size);
>> + s->refcount_block_cache =
>> + block_cache_create(bs, REFCOUNT_CACHE_SIZE, s->cluster_size);
>>
>> s->cluster_cache = g_malloc(s->cluster_size);
>> /* one more sector for decompressed data alignment */
>> @@ -500,7 +502,7 @@ static int qcow2_open(BlockDriverState *bs, int flags)
>> qcow2_refcount_close(bs);
>> g_free(s->l1_table);
>> if (s->l2_table_cache) {
>> - qcow2_cache_destroy(bs, s->l2_table_cache);
>> + block_cache_destroy(bs, s->l2_table_cache, BLOCK_TABLE_L2);
>> }
>> g_free(s->cluster_cache);
>> qemu_vfree(s->cluster_data);
>> @@ -860,13 +862,13 @@ static void qcow2_close(BlockDriverState *bs)
>> BDRVQcowState *s = bs->opaque;
>> g_free(s->l1_table);
>>
>> - qcow2_cache_flush(bs, s->l2_table_cache);
>> - qcow2_cache_flush(bs, s->refcount_block_cache);
>> -
>> + block_cache_flush(bs, s->l2_table_cache,
>> + BLOCK_TABLE_L2, s->cluster_size);
>> + block_cache_flush(bs, s->refcount_block_cache,
>> + BLOCK_TABLE_REF, s->cluster_size);
>> qcow2_mark_clean(bs);
>> -
>> - qcow2_cache_destroy(bs, s->l2_table_cache);
>> - qcow2_cache_destroy(bs, s->refcount_block_cache);
>> + block_cache_destroy(bs, s->l2_table_cache, BLOCK_TABLE_L2);
>> + block_cache_destroy(bs, s->refcount_block_cache, BLOCK_TABLE_REF);
>>
>> g_free(s->unknown_header_fields);
>> cleanup_unknown_header_ext(bs);
>> @@ -1339,8 +1341,6 @@ static int qcow2_create(const char *filename,
>> QEMUOptionParameter *options)
>> options->value.s);
>> return -EINVAL;
>> }
>> - } else if (!strcmp(options->name, BLOCK_OPT_LAZY_REFCOUNTS)) {
>> - flags |= options->value.n ? BLOCK_FLAG_LAZY_REFCOUNTS : 0;
>> }
>> options++;
>> }
>> @@ -1537,18 +1537,18 @@ static coroutine_fn int
>> qcow2_co_flush_to_os(BlockDriverState *bs)
>> int ret;
>>
>> qemu_co_mutex_lock(&s->lock);
>> - ret = qcow2_cache_flush(bs, s->l2_table_cache);
>> + ret = block_cache_flush(bs, s->l2_table_cache,
>> + BLOCK_TABLE_L2, s->cluster_size);
>> if (ret < 0) {
>> qemu_co_mutex_unlock(&s->lock);
>> return ret;
>> }
>>
>> - if (qcow2_need_accurate_refcounts(s)) {
>> - ret = qcow2_cache_flush(bs, s->refcount_block_cache);
>> - if (ret < 0) {
>> - qemu_co_mutex_unlock(&s->lock);
>> - return ret;
>> - }
>> + ret = block_cache_flush(bs, s->refcount_block_cache,
>> + BLOCK_TABLE_REF, s->cluster_size);
>> + if (ret < 0) {
>> + qemu_co_mutex_unlock(&s->lock);
>> + return ret;
>> }
>> qemu_co_mutex_unlock(&s->lock);
>>
>> diff --git a/block/qcow2.h b/block/qcow2.h
>> index b4eb654..cb6fd7a 100644
>> --- a/block/qcow2.h
>> +++ b/block/qcow2.h
>> @@ -27,6 +27,7 @@
>>
>> #include "aes.h"
>> #include "qemu-coroutine.h"
>> +#include "block-cache.h"
>>
>> //#define DEBUG_ALLOC
>> //#define DEBUG_ALLOC2
>> @@ -94,8 +95,6 @@ typedef struct QCowSnapshot {
>> uint64_t vm_clock_nsec;
>> } QCowSnapshot;
>>
>> -struct Qcow2Cache;
>> -typedef struct Qcow2Cache Qcow2Cache;
>>
>> typedef struct Qcow2UnknownHeaderExtension {
>> uint32_t magic;
>> @@ -146,8 +145,8 @@ typedef struct BDRVQcowState {
>> uint64_t l1_table_offset;
>> uint64_t *l1_table;
>>
>> - Qcow2Cache* l2_table_cache;
>> - Qcow2Cache* refcount_block_cache;
>> + BlockCache *l2_table_cache;
>> + BlockCache *refcount_block_cache;
>>
>> uint8_t *cluster_cache;
>> uint8_t *cluster_data;
>> @@ -316,21 +315,4 @@ int qcow2_snapshot_load_tmp(BlockDriverState *bs, const
>> char *snapshot_name);
>>
>> void qcow2_free_snapshots(BlockDriverState *bs);
>> int qcow2_read_snapshots(BlockDriverState *bs);
>> -
>> -/* qcow2-cache.c functions */
>> -Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables);
>> -int qcow2_cache_destroy(BlockDriverState* bs, Qcow2Cache *c);
>> -
>> -void qcow2_cache_entry_mark_dirty(Qcow2Cache *c, void *table);
>> -int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c);
>> -int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c,
>> - Qcow2Cache *dependency);
>> -void qcow2_cache_depends_on_flush(Qcow2Cache *c);
>> -
>> -int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
>> - void **table);
>> -int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t
>> offset,
>> - void **table);
>> -int qcow2_cache_put(BlockDriverState *bs, Qcow2Cache *c, void **table);
>> -
>> #endif
>> diff --git a/trace-events b/trace-events
>> index 6b12f83..52b6438 100644
>> --- a/trace-events
>> +++ b/trace-events
>> @@ -439,12 +439,13 @@ qcow2_l2_allocate_write_l2(void *bs, int l1_index) "bs
>> %p l1_index %d"
>> qcow2_l2_allocate_write_l1(void *bs, int l1_index) "bs %p l1_index %d"
>> qcow2_l2_allocate_done(void *bs, int l1_index, int ret) "bs %p l1_index %d
>> ret %d"
>>
>> -qcow2_cache_get(void *co, int c, uint64_t offset, bool read_from_disk) "co
>> %p is_l2_cache %d offset %" PRIx64 " read_from_disk %d"
>> -qcow2_cache_get_replace_entry(void *co, int c, int i) "co %p is_l2_cache %d
>> index %d"
>> -qcow2_cache_get_read(void *co, int c, int i) "co %p is_l2_cache %d index %d"
>> -qcow2_cache_get_done(void *co, int c, int i) "co %p is_l2_cache %d index %d"
>> -qcow2_cache_flush(void *co, int c) "co %p is_l2_cache %d"
>> -qcow2_cache_entry_flush(void *co, int c, int i) "co %p is_l2_cache %d index
>> %d"
>> +# block/block-cache.c
>> +block_cache_get(void *co, int c, uint64_t offset, bool read_from_disk) "co
>> %p is_l2_cache %d offset %" PRIx64 " read_from_disk %d"
>> +block_cache_get_replace_entry(void *co, int c, int i) "co %p is_l2_cache %d
>> index %d"
>> +block_cache_get_read(void *co, int c, int i) "co %p is_l2_cache %d index %d"
>> +block_cache_get_done(void *co, int c, int i) "co %p is_l2_cache %d index %d"
>> +block_cache_flush(void *co, int c) "co %p is_l2_cache %d"
>> +block_cache_entry_flush(void *co, int c, int i) "co %p is_l2_cache %d index
>> %d"
>>
>> # block/qed-l2-cache.c
>> qed_alloc_l2_cache_entry(void *l2_cache, void *entry) "l2_cache %p entry %p"
>> --
>> 1.7.1
>>
>>
>