#include "block/block_int.h"
#include "qemu/module.h"
#include <zlib.h>
-#include "block/aes.h"
+#include "qemu/aes.h"
#include "block/qcow2.h"
#include "qemu/error-report.h"
#include "qapi/qmp/qerror.h"
+#include "qapi/qmp/qbool.h"
#include "trace.h"
/*
return ret;
}
+static QemuOptsList qcow2_runtime_opts = {
+ .name = "qcow2",
+ .head = QTAILQ_HEAD_INITIALIZER(qcow2_runtime_opts.head),
+ .desc = {
+ {
+ .name = QCOW2_OPT_LAZY_REFCOUNTS,
+ .type = QEMU_OPT_BOOL,
+ .help = "Postpone refcount updates",
+ },
+ {
+ .name = QCOW2_OPT_DISCARD_REQUEST,
+ .type = QEMU_OPT_BOOL,
+ .help = "Pass guest discard requests to the layer below",
+ },
+ {
+ .name = QCOW2_OPT_DISCARD_SNAPSHOT,
+ .type = QEMU_OPT_BOOL,
+ .help = "Generate discard requests when snapshot related space "
+ "is freed",
+ },
+ {
+ .name = QCOW2_OPT_DISCARD_OTHER,
+ .type = QEMU_OPT_BOOL,
+ .help = "Generate discard requests when other clusters are freed",
+ },
+ { /* end of list */ }
+ },
+};
+
static int qcow2_open(BlockDriverState *bs, QDict *options, int flags)
{
BDRVQcowState *s = bs->opaque;
int len, i, ret = 0;
QCowHeader header;
+ QemuOpts *opts;
+ Error *local_err = NULL;
uint64_t ext_end;
+ uint64_t l1_vm_state_index;
ret = bdrv_pread(bs->file, 0, &header, sizeof(header));
if (ret < 0) {
/* read the level 1 table */
s->l1_size = header.l1_size;
- s->l1_vm_state_index = size_to_l1(s, header.size);
+
+ l1_vm_state_index = size_to_l1(s, header.size);
+ if (l1_vm_state_index > INT_MAX) {
+ ret = -EFBIG;
+ goto fail;
+ }
+ s->l1_vm_state_index = l1_vm_state_index;
+
/* the L1 table must contain at least enough entries to put
header.size bytes */
if (s->l1_size < s->l1_vm_state_index) {
}
QLIST_INIT(&s->cluster_allocs);
+ QTAILQ_INIT(&s->discards);
/* read qcow2 extensions */
if (qcow2_read_extensions(bs, header.header_length, ext_end, NULL)) {
}
}
+ /* Enable lazy_refcounts according to image and command line options */
+ opts = qemu_opts_create_nofail(&qcow2_runtime_opts);
+ qemu_opts_absorb_qdict(opts, options, &local_err);
+ if (error_is_set(&local_err)) {
+ qerror_report_err(local_err);
+ error_free(local_err);
+ ret = -EINVAL;
+ goto fail;
+ }
+
+ s->use_lazy_refcounts = qemu_opt_get_bool(opts, QCOW2_OPT_LAZY_REFCOUNTS,
+ (s->compatible_features & QCOW2_COMPAT_LAZY_REFCOUNTS));
+
+ s->discard_passthrough[QCOW2_DISCARD_NEVER] = false;
+ s->discard_passthrough[QCOW2_DISCARD_ALWAYS] = true;
+ s->discard_passthrough[QCOW2_DISCARD_REQUEST] =
+ qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_REQUEST,
+ flags & BDRV_O_UNMAP);
+ s->discard_passthrough[QCOW2_DISCARD_SNAPSHOT] =
+ qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_SNAPSHOT, true);
+ s->discard_passthrough[QCOW2_DISCARD_OTHER] =
+ qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_OTHER, false);
+
+ qemu_opts_del(opts);
+
+ if (s->use_lazy_refcounts && s->qcow_version < 3) {
+ qerror_report(ERROR_CLASS_GENERIC_ERROR, "Lazy refcounts require "
+ "a qcow2 image with at least qemu 1.1 compatibility level");
+ ret = -EINVAL;
+ goto fail;
+ }
+
#ifdef DEBUG_ALLOC
{
BdrvCheckResult result = {0};
int ret;
*pnum = nb_sectors;
- /* FIXME We can get errors here, but the bdrv_co_is_allocated interface
- * can't pass them on today */
qemu_co_mutex_lock(&s->lock);
ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset);
qemu_co_mutex_unlock(&s->lock);
if (ret < 0) {
- *pnum = 0;
+ return ret;
}
- return (cluster_offset != 0);
+ return (cluster_offset != 0) || (ret == QCOW2_CLUSTER_ZERO);
}
/* handle reading after the end of the backing file */
break;
case QCOW2_CLUSTER_ZERO:
- if (s->qcow_version < 3) {
- ret = -EIO;
- goto fail;
- }
qemu_iovec_memset(&hd_qiov, 0, 0, 512 * cur_nr_sectors);
break;
goto fail;
}
- if (l2meta != NULL) {
+ while (l2meta != NULL) {
+ QCowL2Meta *next;
+
ret = qcow2_alloc_cluster_link_l2(bs, l2meta);
if (ret < 0) {
goto fail;
QLIST_REMOVE(l2meta, next_in_flight);
}
- qemu_co_mutex_unlock(&s->lock);
qemu_co_queue_restart_all(&l2meta->dependent_requests);
- qemu_co_mutex_lock(&s->lock);
+ next = l2meta->next;
g_free(l2meta);
- l2meta = NULL;
+ l2meta = next;
}
remaining_sectors -= cur_nr_sectors;
fail:
qemu_co_mutex_unlock(&s->lock);
- if (l2meta != NULL) {
+ while (l2meta != NULL) {
+ QCowL2Meta *next;
+
if (l2meta->nb_clusters != 0) {
QLIST_REMOVE(l2meta, next_in_flight);
}
qemu_co_queue_restart_all(&l2meta->dependent_requests);
+
+ next = l2meta->next;
g_free(l2meta);
+ l2meta = next;
}
qemu_iovec_destroy(&hd_qiov);
AES_KEY aes_encrypt_key;
AES_KEY aes_decrypt_key;
uint32_t crypt_method = 0;
+ QDict *options;
/*
* Backing files are read-only which makes all of their metadata immutable,
qcow2_close(bs);
+ options = qdict_new();
+ qdict_put(options, QCOW2_OPT_LAZY_REFCOUNTS,
+ qbool_from_int(s->use_lazy_refcounts));
+
memset(s, 0, sizeof(BDRVQcowState));
- qcow2_open(bs, NULL, flags);
+ qcow2_open(bs, options, flags);
+
+ QDECREF(options);
if (crypt_method) {
s->crypt_method = crypt_method;
ret = qcow2_alloc_cluster_link_l2(bs, meta);
if (ret < 0) {
- qcow2_free_any_clusters(bs, meta->alloc_offset, meta->nb_clusters);
+ qcow2_free_any_clusters(bs, meta->alloc_offset, meta->nb_clusters,
+ QCOW2_DISCARD_NEVER);
return ret;
}
return ret;
}
- ret = bdrv_file_open(&bs, filename, BDRV_O_RDWR);
+ ret = bdrv_file_open(&bs, filename, NULL, BDRV_O_RDWR);
if (ret < 0) {
return ret;
}
static int qcow2_truncate(BlockDriverState *bs, int64_t offset)
{
BDRVQcowState *s = bs->opaque;
- int ret, new_l1_size;
+ int64_t new_l1_size;
+ int ret;
if (offset & 511) {
error_report("The new size must be a multiple of 512");
return 0;
}
- if (nb_sectors != s->cluster_sectors)
- return -EINVAL;
+ if (nb_sectors != s->cluster_sectors) {
+ ret = -EINVAL;
+
+ /* Zero-pad last write if image size is not cluster aligned */
+ if (sector_num + nb_sectors == bs->total_sectors &&
+ nb_sectors < s->cluster_sectors) {
+ uint8_t *pad_buf = qemu_blockalign(bs, s->cluster_size);
+ memset(pad_buf, 0, s->cluster_size);
+ memcpy(pad_buf, buf, nb_sectors * BDRV_SECTOR_SIZE);
+ ret = qcow2_write_compressed(bs, sector_num,
+ pad_buf, s->cluster_sectors);
+ qemu_vfree(pad_buf);
+ }
+ return ret;
+ }
out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128);
}
#endif
-static int qcow2_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
- int64_t pos, int size)
+static int qcow2_save_vmstate(BlockDriverState *bs, QEMUIOVector *qiov,
+ int64_t pos)
{
BDRVQcowState *s = bs->opaque;
int growable = bs->growable;
BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE);
bs->growable = 1;
- ret = bdrv_pwrite(bs, qcow2_vm_state_offset(s) + pos, buf, size);
+ ret = bdrv_pwritev(bs, qcow2_vm_state_offset(s) + pos, qiov);
bs->growable = growable;
return ret;
.bdrv_close = qcow2_close,
.bdrv_reopen_prepare = qcow2_reopen_prepare,
.bdrv_create = qcow2_create,
+ .bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_co_is_allocated = qcow2_co_is_allocated,
.bdrv_set_key = qcow2_set_key,
.bdrv_make_empty = qcow2_make_empty,