2011-01-11 00:15:10 +08:00
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/*
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* L2/refcount table cache for the QCOW2 format
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*
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* Copyright (c) 2010 Kevin Wolf <kwolf@redhat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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2016-01-19 02:01:42 +08:00
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#include "qemu/osdep.h"
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2012-12-18 01:19:44 +08:00
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#include "block/block_int.h"
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2011-01-11 00:15:10 +08:00
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#include "qemu-common.h"
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#include "qcow2.h"
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2012-03-02 01:36:21 +08:00
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#include "trace.h"
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2011-01-11 00:15:10 +08:00
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typedef struct Qcow2CachedTable {
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2015-05-11 20:54:55 +08:00
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int64_t offset;
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uint64_t lru_counter;
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int ref;
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2015-08-04 20:14:42 +08:00
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bool dirty;
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2011-01-11 00:15:10 +08:00
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} Qcow2CachedTable;
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struct Qcow2Cache {
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2015-05-11 20:54:59 +08:00
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Qcow2CachedTable *entries;
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struct Qcow2Cache *depends;
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2011-01-27 18:25:03 +08:00
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int size;
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2018-02-05 22:33:02 +08:00
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int table_size;
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2011-01-14 22:55:38 +08:00
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bool depends_on_flush;
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2015-05-11 20:54:53 +08:00
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void *table_array;
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2015-05-11 20:54:55 +08:00
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uint64_t lru_counter;
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2015-08-04 20:14:40 +08:00
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uint64_t cache_clean_lru_counter;
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2011-01-11 00:15:10 +08:00
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};
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2015-05-11 20:54:53 +08:00
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static inline void *qcow2_cache_get_table_addr(BlockDriverState *bs,
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Qcow2Cache *c, int table)
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{
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2018-02-05 22:33:02 +08:00
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return (uint8_t *) c->table_array + (size_t) table * c->table_size;
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2015-05-11 20:54:53 +08:00
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}
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2015-05-11 20:54:54 +08:00
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static inline int qcow2_cache_get_table_idx(BlockDriverState *bs,
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Qcow2Cache *c, void *table)
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{
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ptrdiff_t table_offset = (uint8_t *) table - (uint8_t *) c->table_array;
|
2018-02-05 22:33:02 +08:00
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int idx = table_offset / c->table_size;
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assert(idx >= 0 && idx < c->size && table_offset % c->table_size == 0);
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2015-05-11 20:54:54 +08:00
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return idx;
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}
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2017-11-11 04:31:11 +08:00
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static inline const char *qcow2_cache_get_name(BDRVQcow2State *s, Qcow2Cache *c)
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{
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if (c == s->refcount_block_cache) {
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return "refcount block";
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} else if (c == s->l2_table_cache) {
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return "L2 table";
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} else {
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/* Do not abort, because this is not critical */
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|
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return "unknown";
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}
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}
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2015-08-04 20:14:39 +08:00
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static void qcow2_cache_table_release(BlockDriverState *bs, Qcow2Cache *c,
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int i, int num_tables)
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{
|
2016-11-25 19:27:43 +08:00
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|
|
/* Using MADV_DONTNEED to discard memory is a Linux-specific feature */
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|
|
#ifdef CONFIG_LINUX
|
2015-08-04 20:14:39 +08:00
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void *t = qcow2_cache_get_table_addr(bs, c, i);
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int align = getpagesize();
|
2018-02-05 22:33:02 +08:00
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size_t mem_size = (size_t) c->table_size * num_tables;
|
2015-08-04 20:14:39 +08:00
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size_t offset = QEMU_ALIGN_UP((uintptr_t) t, align) - (uintptr_t) t;
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size_t length = QEMU_ALIGN_DOWN(mem_size - offset, align);
|
2017-11-15 02:41:27 +08:00
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|
if (mem_size > offset && length > 0) {
|
2016-11-25 19:27:43 +08:00
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madvise((uint8_t *) t + offset, length, MADV_DONTNEED);
|
2015-08-04 20:14:39 +08:00
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|
}
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#endif
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}
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|
2015-08-04 20:14:40 +08:00
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static inline bool can_clean_entry(Qcow2Cache *c, int i)
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|
{
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Qcow2CachedTable *t = &c->entries[i];
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return t->ref == 0 && !t->dirty && t->offset != 0 &&
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t->lru_counter <= c->cache_clean_lru_counter;
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}
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void qcow2_cache_clean_unused(BlockDriverState *bs, Qcow2Cache *c)
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{
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int i = 0;
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|
while (i < c->size) {
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int to_clean = 0;
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/* Skip the entries that we don't need to clean */
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while (i < c->size && !can_clean_entry(c, i)) {
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i++;
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}
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/* And count how many we can clean in a row */
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while (i < c->size && can_clean_entry(c, i)) {
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c->entries[i].offset = 0;
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c->entries[i].lru_counter = 0;
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i++;
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to_clean++;
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}
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if (to_clean > 0) {
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qcow2_cache_table_release(bs, c, i - to_clean, to_clean);
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}
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}
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c->cache_clean_lru_counter = c->lru_counter;
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}
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|
2012-06-06 06:04:55 +08:00
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Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables)
|
2011-01-11 00:15:10 +08:00
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{
|
2015-09-07 23:12:56 +08:00
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BDRVQcow2State *s = bs->opaque;
|
2011-01-11 00:15:10 +08:00
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Qcow2Cache *c;
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|
2014-08-19 04:07:32 +08:00
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c = g_new0(Qcow2Cache, 1);
|
2011-01-11 00:15:10 +08:00
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c->size = num_tables;
|
2018-02-05 22:33:02 +08:00
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c->table_size = s->cluster_size;
|
2014-08-19 04:07:32 +08:00
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c->entries = g_try_new0(Qcow2CachedTable, num_tables);
|
2015-06-16 20:19:22 +08:00
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c->table_array = qemu_try_blockalign(bs->file->bs,
|
2018-02-05 22:33:02 +08:00
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(size_t) num_tables * c->table_size);
|
2015-05-11 20:54:53 +08:00
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|
if (!c->entries || !c->table_array) {
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qemu_vfree(c->table_array);
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g_free(c->entries);
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g_free(c);
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c = NULL;
|
2011-01-11 00:15:10 +08:00
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}
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return c;
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}
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|
2015-05-11 20:54:59 +08:00
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|
int qcow2_cache_destroy(BlockDriverState *bs, Qcow2Cache *c)
|
2011-01-11 00:15:10 +08:00
|
|
|
{
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int i;
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for (i = 0; i < c->size; i++) {
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assert(c->entries[i].ref == 0);
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}
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|
2015-05-11 20:54:53 +08:00
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qemu_vfree(c->table_array);
|
2011-08-21 11:09:37 +08:00
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g_free(c->entries);
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g_free(c);
|
2011-01-11 00:15:10 +08:00
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return 0;
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}
|
|
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|
static int qcow2_cache_flush_dependency(BlockDriverState *bs, Qcow2Cache *c)
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|
|
|
{
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|
|
|
int ret;
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ret = qcow2_cache_flush(bs, c->depends);
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|
|
|
if (ret < 0) {
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|
return ret;
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|
}
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|
c->depends = NULL;
|
2011-01-14 22:55:38 +08:00
|
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|
c->depends_on_flush = false;
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|
2011-01-11 00:15:10 +08:00
|
|
|
return 0;
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|
}
|
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|
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|
|
static int qcow2_cache_entry_flush(BlockDriverState *bs, Qcow2Cache *c, int i)
|
|
|
|
{
|
2015-09-07 23:12:56 +08:00
|
|
|
BDRVQcow2State *s = bs->opaque;
|
2011-01-14 22:55:38 +08:00
|
|
|
int ret = 0;
|
2011-01-11 00:15:10 +08:00
|
|
|
|
|
|
|
if (!c->entries[i].dirty || !c->entries[i].offset) {
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|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2012-03-02 01:36:21 +08:00
|
|
|
trace_qcow2_cache_entry_flush(qemu_coroutine_self(),
|
|
|
|
c == s->l2_table_cache, i);
|
|
|
|
|
2011-01-11 00:15:10 +08:00
|
|
|
if (c->depends) {
|
|
|
|
ret = qcow2_cache_flush_dependency(bs, c);
|
2011-01-14 22:55:38 +08:00
|
|
|
} else if (c->depends_on_flush) {
|
2015-06-16 20:19:22 +08:00
|
|
|
ret = bdrv_flush(bs->file->bs);
|
2011-01-14 22:55:38 +08:00
|
|
|
if (ret >= 0) {
|
|
|
|
c->depends_on_flush = false;
|
2011-01-11 00:15:10 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-01-14 22:55:38 +08:00
|
|
|
if (ret < 0) {
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2013-08-30 20:34:26 +08:00
|
|
|
if (c == s->refcount_block_cache) {
|
2013-10-10 17:09:23 +08:00
|
|
|
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_REFCOUNT_BLOCK,
|
2018-02-05 22:33:02 +08:00
|
|
|
c->entries[i].offset, c->table_size);
|
2013-08-30 20:34:26 +08:00
|
|
|
} else if (c == s->l2_table_cache) {
|
2013-10-10 17:09:23 +08:00
|
|
|
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_ACTIVE_L2,
|
2018-02-05 22:33:02 +08:00
|
|
|
c->entries[i].offset, c->table_size);
|
2013-08-30 20:34:26 +08:00
|
|
|
} else {
|
2013-10-10 17:09:23 +08:00
|
|
|
ret = qcow2_pre_write_overlap_check(bs, 0,
|
2018-02-05 22:33:02 +08:00
|
|
|
c->entries[i].offset, c->table_size);
|
2013-08-30 20:34:26 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
if (ret < 0) {
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2011-01-11 00:17:28 +08:00
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2016-06-21 02:09:15 +08:00
|
|
|
ret = bdrv_pwrite(bs->file, c->entries[i].offset,
|
2018-02-05 22:33:02 +08:00
|
|
|
qcow2_cache_get_table_addr(bs, c, i), c->table_size);
|
2011-01-11 00:15:10 +08:00
|
|
|
if (ret < 0) {
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
c->entries[i].dirty = false;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2016-06-02 23:58:15 +08:00
|
|
|
int qcow2_cache_write(BlockDriverState *bs, Qcow2Cache *c)
|
2011-01-11 00:15:10 +08:00
|
|
|
{
|
2015-09-07 23:12:56 +08:00
|
|
|
BDRVQcow2State *s = bs->opaque;
|
2011-01-11 00:15:10 +08:00
|
|
|
int result = 0;
|
|
|
|
int ret;
|
|
|
|
int i;
|
|
|
|
|
2012-03-02 01:36:21 +08:00
|
|
|
trace_qcow2_cache_flush(qemu_coroutine_self(), c == s->l2_table_cache);
|
|
|
|
|
2011-01-11 00:15:10 +08:00
|
|
|
for (i = 0; i < c->size; i++) {
|
|
|
|
ret = qcow2_cache_entry_flush(bs, c, i);
|
|
|
|
if (ret < 0 && result != -ENOSPC) {
|
|
|
|
result = ret;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-06-02 23:58:15 +08:00
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
|
|
|
int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c)
|
|
|
|
{
|
|
|
|
int result = qcow2_cache_write(bs, c);
|
|
|
|
|
2011-01-11 00:15:10 +08:00
|
|
|
if (result == 0) {
|
2016-06-02 23:58:15 +08:00
|
|
|
int ret = bdrv_flush(bs->file->bs);
|
2011-01-11 00:15:10 +08:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2011-01-14 22:55:38 +08:00
|
|
|
void qcow2_cache_depends_on_flush(Qcow2Cache *c)
|
|
|
|
{
|
|
|
|
c->depends_on_flush = true;
|
|
|
|
}
|
|
|
|
|
2013-09-03 16:09:51 +08:00
|
|
|
int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c)
|
|
|
|
{
|
|
|
|
int ret, i;
|
|
|
|
|
|
|
|
ret = qcow2_cache_flush(bs, c);
|
|
|
|
if (ret < 0) {
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < c->size; i++) {
|
|
|
|
assert(c->entries[i].ref == 0);
|
|
|
|
c->entries[i].offset = 0;
|
2015-05-11 20:54:55 +08:00
|
|
|
c->entries[i].lru_counter = 0;
|
2013-09-03 16:09:51 +08:00
|
|
|
}
|
|
|
|
|
2015-08-04 20:14:39 +08:00
|
|
|
qcow2_cache_table_release(bs, c, 0, c->size);
|
|
|
|
|
2015-05-11 20:54:55 +08:00
|
|
|
c->lru_counter = 0;
|
|
|
|
|
2013-09-03 16:09:51 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-01-11 00:15:10 +08:00
|
|
|
static int qcow2_cache_do_get(BlockDriverState *bs, Qcow2Cache *c,
|
|
|
|
uint64_t offset, void **table, bool read_from_disk)
|
|
|
|
{
|
2015-09-07 23:12:56 +08:00
|
|
|
BDRVQcow2State *s = bs->opaque;
|
2011-01-11 00:15:10 +08:00
|
|
|
int i;
|
|
|
|
int ret;
|
2015-05-11 20:54:57 +08:00
|
|
|
int lookup_index;
|
2015-05-11 20:54:56 +08:00
|
|
|
uint64_t min_lru_counter = UINT64_MAX;
|
|
|
|
int min_lru_index = -1;
|
2011-01-11 00:15:10 +08:00
|
|
|
|
2017-11-11 04:31:11 +08:00
|
|
|
assert(offset != 0);
|
|
|
|
|
2012-03-02 01:36:21 +08:00
|
|
|
trace_qcow2_cache_get(qemu_coroutine_self(), c == s->l2_table_cache,
|
|
|
|
offset, read_from_disk);
|
|
|
|
|
2018-02-05 22:33:02 +08:00
|
|
|
if (!QEMU_IS_ALIGNED(offset, c->table_size)) {
|
2017-11-11 04:31:11 +08:00
|
|
|
qcow2_signal_corruption(bs, true, -1, -1, "Cannot get entry from %s "
|
|
|
|
"cache: Offset %#" PRIx64 " is unaligned",
|
|
|
|
qcow2_cache_get_name(s, c), offset);
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
|
2011-01-11 00:15:10 +08:00
|
|
|
/* Check if the table is already cached */
|
2018-02-05 22:33:02 +08:00
|
|
|
i = lookup_index = (offset / c->table_size * 4) % c->size;
|
2015-05-11 20:54:57 +08:00
|
|
|
do {
|
2015-05-11 20:54:56 +08:00
|
|
|
const Qcow2CachedTable *t = &c->entries[i];
|
|
|
|
if (t->offset == offset) {
|
2011-01-11 00:15:10 +08:00
|
|
|
goto found;
|
|
|
|
}
|
2015-05-11 20:54:56 +08:00
|
|
|
if (t->ref == 0 && t->lru_counter < min_lru_counter) {
|
|
|
|
min_lru_counter = t->lru_counter;
|
|
|
|
min_lru_index = i;
|
|
|
|
}
|
2015-05-11 20:54:57 +08:00
|
|
|
if (++i == c->size) {
|
|
|
|
i = 0;
|
|
|
|
}
|
|
|
|
} while (i != lookup_index);
|
2015-05-11 20:54:56 +08:00
|
|
|
|
|
|
|
if (min_lru_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();
|
2011-01-11 00:15:10 +08:00
|
|
|
}
|
|
|
|
|
2015-05-11 20:54:56 +08:00
|
|
|
/* Cache miss: write a table back and replace it */
|
|
|
|
i = min_lru_index;
|
2012-03-02 01:36:21 +08:00
|
|
|
trace_qcow2_cache_get_replace_entry(qemu_coroutine_self(),
|
|
|
|
c == s->l2_table_cache, i);
|
2011-01-11 00:15:10 +08:00
|
|
|
|
|
|
|
ret = qcow2_cache_entry_flush(bs, c, i);
|
|
|
|
if (ret < 0) {
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2012-03-02 01:36:21 +08:00
|
|
|
trace_qcow2_cache_get_read(qemu_coroutine_self(),
|
|
|
|
c == s->l2_table_cache, i);
|
2011-01-11 00:15:10 +08:00
|
|
|
c->entries[i].offset = 0;
|
|
|
|
if (read_from_disk) {
|
2011-01-11 00:17:28 +08:00
|
|
|
if (c == s->l2_table_cache) {
|
|
|
|
BLKDBG_EVENT(bs->file, BLKDBG_L2_LOAD);
|
|
|
|
}
|
|
|
|
|
2016-06-21 00:24:02 +08:00
|
|
|
ret = bdrv_pread(bs->file, offset,
|
2015-06-16 20:19:22 +08:00
|
|
|
qcow2_cache_get_table_addr(bs, c, i),
|
2018-02-05 22:33:02 +08:00
|
|
|
c->table_size);
|
2011-01-11 00:15:10 +08:00
|
|
|
if (ret < 0) {
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
c->entries[i].offset = offset;
|
|
|
|
|
|
|
|
/* And return the right table */
|
|
|
|
found:
|
|
|
|
c->entries[i].ref++;
|
2015-05-11 20:54:53 +08:00
|
|
|
*table = qcow2_cache_get_table_addr(bs, c, i);
|
2012-03-02 01:36:21 +08:00
|
|
|
|
|
|
|
trace_qcow2_cache_get_done(qemu_coroutine_self(),
|
|
|
|
c == s->l2_table_cache, i);
|
|
|
|
|
2011-01-11 00:15:10 +08:00
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2015-05-11 20:54:58 +08:00
|
|
|
void qcow2_cache_put(BlockDriverState *bs, Qcow2Cache *c, void **table)
|
2011-01-11 00:15:10 +08:00
|
|
|
{
|
2015-05-11 20:54:54 +08:00
|
|
|
int i = qcow2_cache_get_table_idx(bs, c, *table);
|
2011-01-11 00:15:10 +08:00
|
|
|
|
|
|
|
c->entries[i].ref--;
|
|
|
|
*table = NULL;
|
|
|
|
|
2015-05-11 20:54:55 +08:00
|
|
|
if (c->entries[i].ref == 0) {
|
|
|
|
c->entries[i].lru_counter = ++c->lru_counter;
|
|
|
|
}
|
|
|
|
|
2011-01-11 00:15:10 +08:00
|
|
|
assert(c->entries[i].ref >= 0);
|
|
|
|
}
|
|
|
|
|
2015-05-11 20:54:53 +08:00
|
|
|
void qcow2_cache_entry_mark_dirty(BlockDriverState *bs, Qcow2Cache *c,
|
|
|
|
void *table)
|
2011-01-11 00:15:10 +08:00
|
|
|
{
|
2015-05-11 20:54:54 +08:00
|
|
|
int i = qcow2_cache_get_table_idx(bs, c, table);
|
|
|
|
assert(c->entries[i].offset != 0);
|
2011-01-11 00:15:10 +08:00
|
|
|
c->entries[i].dirty = true;
|
|
|
|
}
|
2017-09-18 20:42:28 +08:00
|
|
|
|
|
|
|
void *qcow2_cache_is_table_offset(BlockDriverState *bs, Qcow2Cache *c,
|
|
|
|
uint64_t offset)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < c->size; i++) {
|
|
|
|
if (c->entries[i].offset == offset) {
|
|
|
|
return qcow2_cache_get_table_addr(bs, c, i);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
void qcow2_cache_discard(BlockDriverState *bs, Qcow2Cache *c, void *table)
|
|
|
|
{
|
|
|
|
int i = qcow2_cache_get_table_idx(bs, c, table);
|
|
|
|
|
|
|
|
assert(c->entries[i].ref == 0);
|
|
|
|
|
|
|
|
c->entries[i].offset = 0;
|
|
|
|
c->entries[i].lru_counter = 0;
|
|
|
|
c->entries[i].dirty = false;
|
|
|
|
|
|
|
|
qcow2_cache_table_release(bs, c, i, 1);
|
|
|
|
}
|