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qemu-e2k/block/qcow2-snapshot.c
Alberto Garcia ef97d608c7 qcow2: Don't round the L1 table allocation up to the sector size 
The L1 table is read from disk using the byte-based bdrv_pread() and
is never accessed beyond its last element, so there's no need to
allocate more memory than that.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: b2e27214ec7b03a585931bcf383ee1ac3a641a10.1579374329.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
2020-02-06 13:47:45 +01:00

1053 lines
33 KiB
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/*
* Block driver for the QCOW version 2 format
*
* Copyright (c) 2004-2006 Fabrice Bellard
*
* 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 "qemu/osdep.h"
#include "qapi/error.h"
#include "qcow2.h"
#include "qemu/bswap.h"
#include "qemu/error-report.h"
#include "qemu/cutils.h"
static void qcow2_free_single_snapshot(BlockDriverState *bs, int i)
{
BDRVQcow2State *s = bs->opaque;
assert(i >= 0 && i < s->nb_snapshots);
g_free(s->snapshots[i].name);
g_free(s->snapshots[i].id_str);
g_free(s->snapshots[i].unknown_extra_data);
memset(&s->snapshots[i], 0, sizeof(s->snapshots[i]));
}
void qcow2_free_snapshots(BlockDriverState *bs)
{
BDRVQcow2State *s = bs->opaque;
int i;
for(i = 0; i < s->nb_snapshots; i++) {
qcow2_free_single_snapshot(bs, i);
}
g_free(s->snapshots);
s->snapshots = NULL;
s->nb_snapshots = 0;
}
/*
* If @repair is true, try to repair a broken snapshot table instead
* of just returning an error:
*
* - If the snapshot table was too long, set *nb_clusters_reduced to
* the number of snapshots removed off the end.
* The caller will update the on-disk nb_snapshots accordingly;
* this leaks clusters, but is safe.
* (The on-disk information must be updated before
* qcow2_check_refcounts(), because that function relies on
* s->nb_snapshots to reflect the on-disk value.)
*
* - If there were snapshots with too much extra metadata, increment
* *extra_data_dropped for each.
* This requires the caller to eventually rewrite the whole snapshot
* table, which requires cluster allocation. Therefore, this should
* be done only after qcow2_check_refcounts() made sure the refcount
* structures are valid.
* (In the meantime, the image is still valid because
* qcow2_check_refcounts() does not do anything with snapshots'
* extra data.)
*/
static int qcow2_do_read_snapshots(BlockDriverState *bs, bool repair,
int *nb_clusters_reduced,
int *extra_data_dropped,
Error **errp)
{
BDRVQcow2State *s = bs->opaque;
QCowSnapshotHeader h;
QCowSnapshotExtraData extra;
QCowSnapshot *sn;
int i, id_str_size, name_size;
int64_t offset, pre_sn_offset;
uint64_t table_length = 0;
int ret;
if (!s->nb_snapshots) {
s->snapshots = NULL;
s->snapshots_size = 0;
return 0;
}
offset = s->snapshots_offset;
s->snapshots = g_new0(QCowSnapshot, s->nb_snapshots);
for(i = 0; i < s->nb_snapshots; i++) {
bool truncate_unknown_extra_data = false;
pre_sn_offset = offset;
table_length = ROUND_UP(table_length, 8);
/* Read statically sized part of the snapshot header */
offset = ROUND_UP(offset, 8);
ret = bdrv_pread(bs->file, offset, &h, sizeof(h));
if (ret < 0) {
error_setg_errno(errp, -ret, "Failed to read snapshot table");
goto fail;
}
offset += sizeof(h);
sn = s->snapshots + i;
sn->l1_table_offset = be64_to_cpu(h.l1_table_offset);
sn->l1_size = be32_to_cpu(h.l1_size);
sn->vm_state_size = be32_to_cpu(h.vm_state_size);
sn->date_sec = be32_to_cpu(h.date_sec);
sn->date_nsec = be32_to_cpu(h.date_nsec);
sn->vm_clock_nsec = be64_to_cpu(h.vm_clock_nsec);
sn->extra_data_size = be32_to_cpu(h.extra_data_size);
id_str_size = be16_to_cpu(h.id_str_size);
name_size = be16_to_cpu(h.name_size);
if (sn->extra_data_size > QCOW_MAX_SNAPSHOT_EXTRA_DATA) {
if (!repair) {
ret = -EFBIG;
error_setg(errp, "Too much extra metadata in snapshot table "
"entry %i", i);
error_append_hint(errp, "You can force-remove this extra "
"metadata with qemu-img check -r all\n");
goto fail;
}
fprintf(stderr, "Discarding too much extra metadata in snapshot "
"table entry %i (%" PRIu32 " > %u)\n",
i, sn->extra_data_size, QCOW_MAX_SNAPSHOT_EXTRA_DATA);
(*extra_data_dropped)++;
truncate_unknown_extra_data = true;
}
/* Read known extra data */
ret = bdrv_pread(bs->file, offset, &extra,
MIN(sizeof(extra), sn->extra_data_size));
if (ret < 0) {
error_setg_errno(errp, -ret, "Failed to read snapshot table");
goto fail;
}
offset += MIN(sizeof(extra), sn->extra_data_size);
if (sn->extra_data_size >= endof(QCowSnapshotExtraData,
vm_state_size_large)) {
sn->vm_state_size = be64_to_cpu(extra.vm_state_size_large);
}
if (sn->extra_data_size >= endof(QCowSnapshotExtraData, disk_size)) {
sn->disk_size = be64_to_cpu(extra.disk_size);
} else {
sn->disk_size = bs->total_sectors * BDRV_SECTOR_SIZE;
}
if (sn->extra_data_size > sizeof(extra)) {
uint64_t extra_data_end;
size_t unknown_extra_data_size;
extra_data_end = offset + sn->extra_data_size - sizeof(extra);
if (truncate_unknown_extra_data) {
sn->extra_data_size = QCOW_MAX_SNAPSHOT_EXTRA_DATA;
}
/* Store unknown extra data */
unknown_extra_data_size = sn->extra_data_size - sizeof(extra);
sn->unknown_extra_data = g_malloc(unknown_extra_data_size);
ret = bdrv_pread(bs->file, offset, sn->unknown_extra_data,
unknown_extra_data_size);
if (ret < 0) {
error_setg_errno(errp, -ret,
"Failed to read snapshot table");
goto fail;
}
offset = extra_data_end;
}
/* Read snapshot ID */
sn->id_str = g_malloc(id_str_size + 1);
ret = bdrv_pread(bs->file, offset, sn->id_str, id_str_size);
if (ret < 0) {
error_setg_errno(errp, -ret, "Failed to read snapshot table");
goto fail;
}
offset += id_str_size;
sn->id_str[id_str_size] = '\0';
/* Read snapshot name */
sn->name = g_malloc(name_size + 1);
ret = bdrv_pread(bs->file, offset, sn->name, name_size);
if (ret < 0) {
error_setg_errno(errp, -ret, "Failed to read snapshot table");
goto fail;
}
offset += name_size;
sn->name[name_size] = '\0';
/* Note that the extra data may have been truncated */
table_length += sizeof(h) + sn->extra_data_size + id_str_size +
name_size;
if (!repair) {
assert(table_length == offset - s->snapshots_offset);
}
if (table_length > QCOW_MAX_SNAPSHOTS_SIZE ||
offset - s->snapshots_offset > INT_MAX)
{
if (!repair) {
ret = -EFBIG;
error_setg(errp, "Snapshot table is too big");
error_append_hint(errp, "You can force-remove all %u "
"overhanging snapshots with qemu-img check "
"-r all\n", s->nb_snapshots - i);
goto fail;
}
fprintf(stderr, "Discarding %u overhanging snapshots (snapshot "
"table is too big)\n", s->nb_snapshots - i);
*nb_clusters_reduced += (s->nb_snapshots - i);
/* Discard current snapshot also */
qcow2_free_single_snapshot(bs, i);
/*
* This leaks all the rest of the snapshot table and the
* snapshots' clusters, but we run in check -r all mode,
* so qcow2_check_refcounts() will take care of it.
*/
s->nb_snapshots = i;
offset = pre_sn_offset;
break;
}
}
assert(offset - s->snapshots_offset <= INT_MAX);
s->snapshots_size = offset - s->snapshots_offset;
return 0;
fail:
qcow2_free_snapshots(bs);
return ret;
}
int qcow2_read_snapshots(BlockDriverState *bs, Error **errp)
{
return qcow2_do_read_snapshots(bs, false, NULL, NULL, errp);
}
/* add at the end of the file a new list of snapshots */
int qcow2_write_snapshots(BlockDriverState *bs)
{
BDRVQcow2State *s = bs->opaque;
QCowSnapshot *sn;
QCowSnapshotHeader h;
QCowSnapshotExtraData extra;
int i, name_size, id_str_size, snapshots_size;
struct {
uint32_t nb_snapshots;
uint64_t snapshots_offset;
} QEMU_PACKED header_data;
int64_t offset, snapshots_offset = 0;
int ret;
/* compute the size of the snapshots */
offset = 0;
for(i = 0; i < s->nb_snapshots; i++) {
sn = s->snapshots + i;
offset = ROUND_UP(offset, 8);
offset += sizeof(h);
offset += MAX(sizeof(extra), sn->extra_data_size);
offset += strlen(sn->id_str);
offset += strlen(sn->name);
if (offset > QCOW_MAX_SNAPSHOTS_SIZE) {
ret = -EFBIG;
goto fail;
}
}
assert(offset <= INT_MAX);
snapshots_size = offset;
/* Allocate space for the new snapshot list */
snapshots_offset = qcow2_alloc_clusters(bs, snapshots_size);
offset = snapshots_offset;
if (offset < 0) {
ret = offset;
goto fail;
}
ret = bdrv_flush(bs);
if (ret < 0) {
goto fail;
}
/* The snapshot list position has not yet been updated, so these clusters
* must indeed be completely free */
ret = qcow2_pre_write_overlap_check(bs, 0, offset, snapshots_size, false);
if (ret < 0) {
goto fail;
}
/* Write all snapshots to the new list */
for(i = 0; i < s->nb_snapshots; i++) {
sn = s->snapshots + i;
memset(&h, 0, sizeof(h));
h.l1_table_offset = cpu_to_be64(sn->l1_table_offset);
h.l1_size = cpu_to_be32(sn->l1_size);
/* If it doesn't fit in 32 bit, older implementations should treat it
* as a disk-only snapshot rather than truncate the VM state */
if (sn->vm_state_size <= 0xffffffff) {
h.vm_state_size = cpu_to_be32(sn->vm_state_size);
}
h.date_sec = cpu_to_be32(sn->date_sec);
h.date_nsec = cpu_to_be32(sn->date_nsec);
h.vm_clock_nsec = cpu_to_be64(sn->vm_clock_nsec);
h.extra_data_size = cpu_to_be32(MAX(sizeof(extra),
sn->extra_data_size));
memset(&extra, 0, sizeof(extra));
extra.vm_state_size_large = cpu_to_be64(sn->vm_state_size);
extra.disk_size = cpu_to_be64(sn->disk_size);
id_str_size = strlen(sn->id_str);
name_size = strlen(sn->name);
assert(id_str_size <= UINT16_MAX && name_size <= UINT16_MAX);
h.id_str_size = cpu_to_be16(id_str_size);
h.name_size = cpu_to_be16(name_size);
offset = ROUND_UP(offset, 8);
ret = bdrv_pwrite(bs->file, offset, &h, sizeof(h));
if (ret < 0) {
goto fail;
}
offset += sizeof(h);
ret = bdrv_pwrite(bs->file, offset, &extra, sizeof(extra));
if (ret < 0) {
goto fail;
}
offset += sizeof(extra);
if (sn->extra_data_size > sizeof(extra)) {
size_t unknown_extra_data_size =
sn->extra_data_size - sizeof(extra);
/* qcow2_read_snapshots() ensures no unbounded allocation */
assert(unknown_extra_data_size <= BDRV_REQUEST_MAX_BYTES);
assert(sn->unknown_extra_data);
ret = bdrv_pwrite(bs->file, offset, sn->unknown_extra_data,
unknown_extra_data_size);
if (ret < 0) {
goto fail;
}
offset += unknown_extra_data_size;
}
ret = bdrv_pwrite(bs->file, offset, sn->id_str, id_str_size);
if (ret < 0) {
goto fail;
}
offset += id_str_size;
ret = bdrv_pwrite(bs->file, offset, sn->name, name_size);
if (ret < 0) {
goto fail;
}
offset += name_size;
}
/*
* Update the header to point to the new snapshot table. This requires the
* new table and its refcounts to be stable on disk.
*/
ret = bdrv_flush(bs);
if (ret < 0) {
goto fail;
}
QEMU_BUILD_BUG_ON(offsetof(QCowHeader, snapshots_offset) !=
endof(QCowHeader, nb_snapshots));
header_data.nb_snapshots = cpu_to_be32(s->nb_snapshots);
header_data.snapshots_offset = cpu_to_be64(snapshots_offset);
ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, nb_snapshots),
&header_data, sizeof(header_data));
if (ret < 0) {
goto fail;
}
/* free the old snapshot table */
qcow2_free_clusters(bs, s->snapshots_offset, s->snapshots_size,
QCOW2_DISCARD_SNAPSHOT);
s->snapshots_offset = snapshots_offset;
s->snapshots_size = snapshots_size;
return 0;
fail:
if (snapshots_offset > 0) {
qcow2_free_clusters(bs, snapshots_offset, snapshots_size,
QCOW2_DISCARD_ALWAYS);
}
return ret;
}
int coroutine_fn qcow2_check_read_snapshot_table(BlockDriverState *bs,
BdrvCheckResult *result,
BdrvCheckMode fix)
{
BDRVQcow2State *s = bs->opaque;
Error *local_err = NULL;
int nb_clusters_reduced = 0;
int extra_data_dropped = 0;
int ret;
struct {
uint32_t nb_snapshots;
uint64_t snapshots_offset;
} QEMU_PACKED snapshot_table_pointer;
/* qcow2_do_open() discards this information in check mode */
ret = bdrv_pread(bs->file, offsetof(QCowHeader, nb_snapshots),
&snapshot_table_pointer, sizeof(snapshot_table_pointer));
if (ret < 0) {
result->check_errors++;
fprintf(stderr, "ERROR failed to read the snapshot table pointer from "
"the image header: %s\n", strerror(-ret));
return ret;
}
s->snapshots_offset = be64_to_cpu(snapshot_table_pointer.snapshots_offset);
s->nb_snapshots = be32_to_cpu(snapshot_table_pointer.nb_snapshots);
if (s->nb_snapshots > QCOW_MAX_SNAPSHOTS && (fix & BDRV_FIX_ERRORS)) {
fprintf(stderr, "Discarding %u overhanging snapshots\n",
s->nb_snapshots - QCOW_MAX_SNAPSHOTS);
nb_clusters_reduced += s->nb_snapshots - QCOW_MAX_SNAPSHOTS;
s->nb_snapshots = QCOW_MAX_SNAPSHOTS;
}
ret = qcow2_validate_table(bs, s->snapshots_offset, s->nb_snapshots,
sizeof(QCowSnapshotHeader),
sizeof(QCowSnapshotHeader) * QCOW_MAX_SNAPSHOTS,
"snapshot table", &local_err);
if (ret < 0) {
result->check_errors++;
error_reportf_err(local_err, "ERROR ");
if (s->nb_snapshots > QCOW_MAX_SNAPSHOTS) {
fprintf(stderr, "You can force-remove all %u overhanging snapshots "
"with qemu-img check -r all\n",
s->nb_snapshots - QCOW_MAX_SNAPSHOTS);
}
/* We did not read the snapshot table, so invalidate this information */
s->snapshots_offset = 0;
s->nb_snapshots = 0;
return ret;
}
qemu_co_mutex_unlock(&s->lock);
ret = qcow2_do_read_snapshots(bs, fix & BDRV_FIX_ERRORS,
&nb_clusters_reduced, &extra_data_dropped,
&local_err);
qemu_co_mutex_lock(&s->lock);
if (ret < 0) {
result->check_errors++;
error_reportf_err(local_err,
"ERROR failed to read the snapshot table: ");
/* We did not read the snapshot table, so invalidate this information */
s->snapshots_offset = 0;
s->nb_snapshots = 0;
return ret;
}
result->corruptions += nb_clusters_reduced + extra_data_dropped;
if (nb_clusters_reduced) {
/*
* Update image header now, because:
* (1) qcow2_check_refcounts() relies on s->nb_snapshots to be
* the same as what the image header says,
* (2) this leaks clusters, but qcow2_check_refcounts() will
* fix that.
*/
assert(fix & BDRV_FIX_ERRORS);
snapshot_table_pointer.nb_snapshots = cpu_to_be32(s->nb_snapshots);
ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, nb_snapshots),
&snapshot_table_pointer.nb_snapshots,
sizeof(snapshot_table_pointer.nb_snapshots));
if (ret < 0) {
result->check_errors++;
fprintf(stderr, "ERROR failed to update the snapshot count in the "
"image header: %s\n", strerror(-ret));
return ret;
}
result->corruptions_fixed += nb_clusters_reduced;
result->corruptions -= nb_clusters_reduced;
}
/*
* All of v3 images' snapshot table entries need to have at least
* 16 bytes of extra data.
*/
if (s->qcow_version >= 3) {
int i;
for (i = 0; i < s->nb_snapshots; i++) {
if (s->snapshots[i].extra_data_size <
sizeof_field(QCowSnapshotExtraData, vm_state_size_large) +
sizeof_field(QCowSnapshotExtraData, disk_size))
{
result->corruptions++;
fprintf(stderr, "%s snapshot table entry %i is incomplete\n",
fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i);
}
}
}
return 0;
}
int coroutine_fn qcow2_check_fix_snapshot_table(BlockDriverState *bs,
BdrvCheckResult *result,
BdrvCheckMode fix)
{
BDRVQcow2State *s = bs->opaque;
int ret;
if (result->corruptions && (fix & BDRV_FIX_ERRORS)) {
qemu_co_mutex_unlock(&s->lock);
ret = qcow2_write_snapshots(bs);
qemu_co_mutex_lock(&s->lock);
if (ret < 0) {
result->check_errors++;
fprintf(stderr, "ERROR failed to update snapshot table: %s\n",
strerror(-ret));
return ret;
}
result->corruptions_fixed += result->corruptions;
result->corruptions = 0;
}
return 0;
}
static void find_new_snapshot_id(BlockDriverState *bs,
char *id_str, int id_str_size)
{
BDRVQcow2State *s = bs->opaque;
QCowSnapshot *sn;
int i;
unsigned long id, id_max = 0;
for(i = 0; i < s->nb_snapshots; i++) {
sn = s->snapshots + i;
id = strtoul(sn->id_str, NULL, 10);
if (id > id_max)
id_max = id;
}
snprintf(id_str, id_str_size, "%lu", id_max + 1);
}
static int find_snapshot_by_id_and_name(BlockDriverState *bs,
const char *id,
const char *name)
{
BDRVQcow2State *s = bs->opaque;
int i;
if (id && name) {
for (i = 0; i < s->nb_snapshots; i++) {
if (!strcmp(s->snapshots[i].id_str, id) &&
!strcmp(s->snapshots[i].name, name)) {
return i;
}
}
} else if (id) {
for (i = 0; i < s->nb_snapshots; i++) {
if (!strcmp(s->snapshots[i].id_str, id)) {
return i;
}
}
} else if (name) {
for (i = 0; i < s->nb_snapshots; i++) {
if (!strcmp(s->snapshots[i].name, name)) {
return i;
}
}
}
return -1;
}
static int find_snapshot_by_id_or_name(BlockDriverState *bs,
const char *id_or_name)
{
int ret;
ret = find_snapshot_by_id_and_name(bs, id_or_name, NULL);
if (ret >= 0) {
return ret;
}
return find_snapshot_by_id_and_name(bs, NULL, id_or_name);
}
/* if no id is provided, a new one is constructed */
int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
{
BDRVQcow2State *s = bs->opaque;
QCowSnapshot *new_snapshot_list = NULL;
QCowSnapshot *old_snapshot_list = NULL;
QCowSnapshot sn1, *sn = &sn1;
int i, ret;
uint64_t *l1_table = NULL;
int64_t l1_table_offset;
if (s->nb_snapshots >= QCOW_MAX_SNAPSHOTS) {
return -EFBIG;
}
if (has_data_file(bs)) {
return -ENOTSUP;
}
memset(sn, 0, sizeof(*sn));
/* Generate an ID */
find_new_snapshot_id(bs, sn_info->id_str, sizeof(sn_info->id_str));
/* Populate sn with passed data */
sn->id_str = g_strdup(sn_info->id_str);
sn->name = g_strdup(sn_info->name);
sn->disk_size = bs->total_sectors * BDRV_SECTOR_SIZE;
sn->vm_state_size = sn_info->vm_state_size;
sn->date_sec = sn_info->date_sec;
sn->date_nsec = sn_info->date_nsec;
sn->vm_clock_nsec = sn_info->vm_clock_nsec;
sn->extra_data_size = sizeof(QCowSnapshotExtraData);
/* Allocate the L1 table of the snapshot and copy the current one there. */
l1_table_offset = qcow2_alloc_clusters(bs, s->l1_size * sizeof(uint64_t));
if (l1_table_offset < 0) {
ret = l1_table_offset;
goto fail;
}
sn->l1_table_offset = l1_table_offset;
sn->l1_size = s->l1_size;
l1_table = g_try_new(uint64_t, s->l1_size);
if (s->l1_size && l1_table == NULL) {
ret = -ENOMEM;
goto fail;
}
for(i = 0; i < s->l1_size; i++) {
l1_table[i] = cpu_to_be64(s->l1_table[i]);
}
ret = qcow2_pre_write_overlap_check(bs, 0, sn->l1_table_offset,
s->l1_size * sizeof(uint64_t), false);
if (ret < 0) {
goto fail;
}
ret = bdrv_pwrite(bs->file, sn->l1_table_offset, l1_table,
s->l1_size * sizeof(uint64_t));
if (ret < 0) {
goto fail;
}
g_free(l1_table);
l1_table = NULL;
/*
* Increase the refcounts of all clusters and make sure everything is
* stable on disk before updating the snapshot table to contain a pointer
* to the new L1 table.
*/
ret = qcow2_update_snapshot_refcount(bs, s->l1_table_offset, s->l1_size, 1);
if (ret < 0) {
goto fail;
}
/* Append the new snapshot to the snapshot list */
new_snapshot_list = g_new(QCowSnapshot, s->nb_snapshots + 1);
if (s->snapshots) {
memcpy(new_snapshot_list, s->snapshots,
s->nb_snapshots * sizeof(QCowSnapshot));
old_snapshot_list = s->snapshots;
}
s->snapshots = new_snapshot_list;
s->snapshots[s->nb_snapshots++] = *sn;
ret = qcow2_write_snapshots(bs);
if (ret < 0) {
g_free(s->snapshots);
s->snapshots = old_snapshot_list;
s->nb_snapshots--;
goto fail;
}
g_free(old_snapshot_list);
/* The VM state isn't needed any more in the active L1 table; in fact, it
* hurts by causing expensive COW for the next snapshot. */
qcow2_cluster_discard(bs, qcow2_vm_state_offset(s),
ROUND_UP(sn->vm_state_size, s->cluster_size),
QCOW2_DISCARD_NEVER, false);
#ifdef DEBUG_ALLOC
{
BdrvCheckResult result = {0};
qcow2_check_refcounts(bs, &result, 0);
}
#endif
return 0;
fail:
g_free(sn->id_str);
g_free(sn->name);
g_free(l1_table);
return ret;
}
/* copy the snapshot 'snapshot_name' into the current disk image */
int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id)
{
BDRVQcow2State *s = bs->opaque;
QCowSnapshot *sn;
Error *local_err = NULL;
int i, snapshot_index;
int cur_l1_bytes, sn_l1_bytes;
int ret;
uint64_t *sn_l1_table = NULL;
if (has_data_file(bs)) {
return -ENOTSUP;
}
/* Search the snapshot */
snapshot_index = find_snapshot_by_id_or_name(bs, snapshot_id);
if (snapshot_index < 0) {
return -ENOENT;
}
sn = &s->snapshots[snapshot_index];
ret = qcow2_validate_table(bs, sn->l1_table_offset, sn->l1_size,
sizeof(uint64_t), QCOW_MAX_L1_SIZE,
"Snapshot L1 table", &local_err);
if (ret < 0) {
error_report_err(local_err);
goto fail;
}
if (sn->disk_size != bs->total_sectors * BDRV_SECTOR_SIZE) {
error_report("qcow2: Loading snapshots with different disk "
"size is not implemented");
ret = -ENOTSUP;
goto fail;
}
/*
* Make sure that the current L1 table is big enough to contain the whole
* L1 table of the snapshot. If the snapshot L1 table is smaller, the
* current one must be padded with zeros.
*/
ret = qcow2_grow_l1_table(bs, sn->l1_size, true);
if (ret < 0) {
goto fail;
}
cur_l1_bytes = s->l1_size * sizeof(uint64_t);
sn_l1_bytes = sn->l1_size * sizeof(uint64_t);
/*
* Copy the snapshot L1 table to the current L1 table.
*
* Before overwriting the old current L1 table on disk, make sure to
* increase all refcounts for the clusters referenced by the new one.
* Decrease the refcount referenced by the old one only when the L1
* table is overwritten.
*/
sn_l1_table = g_try_malloc0(cur_l1_bytes);
if (cur_l1_bytes && sn_l1_table == NULL) {
ret = -ENOMEM;
goto fail;
}
ret = bdrv_pread(bs->file, sn->l1_table_offset,
sn_l1_table, sn_l1_bytes);
if (ret < 0) {
goto fail;
}
ret = qcow2_update_snapshot_refcount(bs, sn->l1_table_offset,
sn->l1_size, 1);
if (ret < 0) {
goto fail;
}
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_ACTIVE_L1,
s->l1_table_offset, cur_l1_bytes,
false);
if (ret < 0) {
goto fail;
}
ret = bdrv_pwrite_sync(bs->file, s->l1_table_offset, sn_l1_table,
cur_l1_bytes);
if (ret < 0) {
goto fail;
}
/*
* Decrease refcount of clusters of current L1 table.
*
* At this point, the in-memory s->l1_table points to the old L1 table,
* whereas on disk we already have the new one.
*
* qcow2_update_snapshot_refcount special cases the current L1 table to use
* the in-memory data instead of really using the offset to load a new one,
* which is why this works.
*/
ret = qcow2_update_snapshot_refcount(bs, s->l1_table_offset,
s->l1_size, -1);
/*
* Now update the in-memory L1 table to be in sync with the on-disk one. We
* need to do this even if updating refcounts failed.
*/
for(i = 0;i < s->l1_size; i++) {
s->l1_table[i] = be64_to_cpu(sn_l1_table[i]);
}
if (ret < 0) {
goto fail;
}
g_free(sn_l1_table);
sn_l1_table = NULL;
/*
* Update QCOW_OFLAG_COPIED in the active L1 table (it may have changed
* when we decreased the refcount of the old snapshot.
*/
ret = qcow2_update_snapshot_refcount(bs, s->l1_table_offset, s->l1_size, 0);
if (ret < 0) {
goto fail;
}
#ifdef DEBUG_ALLOC
{
BdrvCheckResult result = {0};
qcow2_check_refcounts(bs, &result, 0);
}
#endif
return 0;
fail:
g_free(sn_l1_table);
return ret;
}
int qcow2_snapshot_delete(BlockDriverState *bs,
const char *snapshot_id,
const char *name,
Error **errp)
{
BDRVQcow2State *s = bs->opaque;
QCowSnapshot sn;
int snapshot_index, ret;
if (has_data_file(bs)) {
return -ENOTSUP;
}
/* Search the snapshot */
snapshot_index = find_snapshot_by_id_and_name(bs, snapshot_id, name);
if (snapshot_index < 0) {
error_setg(errp, "Can't find the snapshot");
return -ENOENT;
}
sn = s->snapshots[snapshot_index];
ret = qcow2_validate_table(bs, sn.l1_table_offset, sn.l1_size,
sizeof(uint64_t), QCOW_MAX_L1_SIZE,
"Snapshot L1 table", errp);
if (ret < 0) {
return ret;
}
/* Remove it from the snapshot list */
memmove(s->snapshots + snapshot_index,
s->snapshots + snapshot_index + 1,
(s->nb_snapshots - snapshot_index - 1) * sizeof(sn));
s->nb_snapshots--;
ret = qcow2_write_snapshots(bs);
if (ret < 0) {
error_setg_errno(errp, -ret,
"Failed to remove snapshot from snapshot list");
return ret;
}
/*
* The snapshot is now unused, clean up. If we fail after this point, we
* won't recover but just leak clusters.
*/
g_free(sn.unknown_extra_data);
g_free(sn.id_str);
g_free(sn.name);
/*
* Now decrease the refcounts of clusters referenced by the snapshot and
* free the L1 table.
*/
ret = qcow2_update_snapshot_refcount(bs, sn.l1_table_offset,
sn.l1_size, -1);
if (ret < 0) {
error_setg_errno(errp, -ret, "Failed to free the cluster and L1 table");
return ret;
}
qcow2_free_clusters(bs, sn.l1_table_offset, sn.l1_size * sizeof(uint64_t),
QCOW2_DISCARD_SNAPSHOT);
/* must update the copied flag on the current cluster offsets */
ret = qcow2_update_snapshot_refcount(bs, s->l1_table_offset, s->l1_size, 0);
if (ret < 0) {
error_setg_errno(errp, -ret,
"Failed to update snapshot status in disk");
return ret;
}
#ifdef DEBUG_ALLOC
{
BdrvCheckResult result = {0};
qcow2_check_refcounts(bs, &result, 0);
}
#endif
return 0;
}
int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab)
{
BDRVQcow2State *s = bs->opaque;
QEMUSnapshotInfo *sn_tab, *sn_info;
QCowSnapshot *sn;
int i;
if (has_data_file(bs)) {
return -ENOTSUP;
}
if (!s->nb_snapshots) {
*psn_tab = NULL;
return s->nb_snapshots;
}
sn_tab = g_new0(QEMUSnapshotInfo, s->nb_snapshots);
for(i = 0; i < s->nb_snapshots; i++) {
sn_info = sn_tab + i;
sn = s->snapshots + i;
pstrcpy(sn_info->id_str, sizeof(sn_info->id_str),
sn->id_str);
pstrcpy(sn_info->name, sizeof(sn_info->name),
sn->name);
sn_info->vm_state_size = sn->vm_state_size;
sn_info->date_sec = sn->date_sec;
sn_info->date_nsec = sn->date_nsec;
sn_info->vm_clock_nsec = sn->vm_clock_nsec;
}
*psn_tab = sn_tab;
return s->nb_snapshots;
}
int qcow2_snapshot_load_tmp(BlockDriverState *bs,
const char *snapshot_id,
const char *name,
Error **errp)
{
int i, snapshot_index;
BDRVQcow2State *s = bs->opaque;
QCowSnapshot *sn;
uint64_t *new_l1_table;
int new_l1_bytes;
int ret;
assert(bs->read_only);
/* Search the snapshot */
snapshot_index = find_snapshot_by_id_and_name(bs, snapshot_id, name);
if (snapshot_index < 0) {
error_setg(errp,
"Can't find snapshot");
return -ENOENT;
}
sn = &s->snapshots[snapshot_index];
/* Allocate and read in the snapshot's L1 table */
ret = qcow2_validate_table(bs, sn->l1_table_offset, sn->l1_size,
sizeof(uint64_t), QCOW_MAX_L1_SIZE,
"Snapshot L1 table", errp);
if (ret < 0) {
return ret;
}
new_l1_bytes = sn->l1_size * sizeof(uint64_t);
new_l1_table = qemu_try_blockalign(bs->file->bs, new_l1_bytes);
if (new_l1_table == NULL) {
return -ENOMEM;
}
ret = bdrv_pread(bs->file, sn->l1_table_offset,
new_l1_table, new_l1_bytes);
if (ret < 0) {
error_setg(errp, "Failed to read l1 table for snapshot");
qemu_vfree(new_l1_table);
return ret;
}
/* Switch the L1 table */
qemu_vfree(s->l1_table);
s->l1_size = sn->l1_size;
s->l1_table_offset = sn->l1_table_offset;
s->l1_table = new_l1_table;
for(i = 0;i < s->l1_size; i++) {
be64_to_cpus(&s->l1_table[i]);
}
return 0;
}
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