static int parallels_open(BlockDriverState *bs, int flags)
{
BDRVParallelsState *s = bs->opaque;
int i;
struct parallels_header ph;
bs->read_only = 1; // no write support yet
if (bdrv_pread(bs->file, 0, &ph, sizeof(ph)) != sizeof(ph))
goto fail;
if (memcmp(ph.magic, HEADER_MAGIC, 16) ||
(le32_to_cpu(ph.version) != HEADER_VERSION)) {
goto fail;
}
bs->total_sectors = le32_to_cpu(ph.nb_sectors);
s->tracks = le32_to_cpu(ph.tracks);
s->catalog_size = le32_to_cpu(ph.catalog_entries);
s->catalog_bitmap = g_malloc(s->catalog_size * 4);
if (bdrv_pread(bs->file, 64, s->catalog_bitmap, s->catalog_size * 4) !=
s->catalog_size * 4)
goto fail;
for (i = 0; i < s->catalog_size; i++)
le32_to_cpus(&s->catalog_bitmap[i]);
return 0;
fail:
if (s->catalog_bitmap)
g_free(s->catalog_bitmap);
return -1;
}
static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
BDRVParallelsState *s = bs->opaque;
int i;
struct parallels_header ph;
int ret;
bs->read_only = 1; // no write support yet
ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph));
if (ret < 0) {
goto fail;
}
if (memcmp(ph.magic, HEADER_MAGIC, 16) ||
(le32_to_cpu(ph.version) != HEADER_VERSION)) {
error_setg(errp, "Image not in Parallels format");
ret = -EINVAL;
goto fail;
}
bs->total_sectors = le32_to_cpu(ph.nb_sectors);
s->tracks = le32_to_cpu(ph.tracks);
if (s->tracks == 0) {
error_setg(errp, "Invalid image: Zero sectors per track");
ret = -EINVAL;
goto fail;
}
s->catalog_size = le32_to_cpu(ph.catalog_entries);
if (s->catalog_size > INT_MAX / 4) {
error_setg(errp, "Catalog too large");
ret = -EFBIG;
goto fail;
}
s->catalog_bitmap = g_try_malloc(s->catalog_size * 4);
if (s->catalog_size && s->catalog_bitmap == NULL) {
ret = -ENOMEM;
goto fail;
}
ret = bdrv_pread(bs->file, 64, s->catalog_bitmap, s->catalog_size * 4);
if (ret < 0) {
goto fail;
}
for (i = 0; i < s->catalog_size; i++)
le32_to_cpus(&s->catalog_bitmap[i]);
qemu_co_mutex_init(&s->lock);
return 0;
fail:
g_free(s->catalog_bitmap);
return ret;
}
static inline int dmg_read_chunk(BlockDriverState *bs, int sector_num)
{
BDRVDMGState *s = bs->opaque;
if(!is_sector_in_chunk(s,s->current_chunk,sector_num)) {
int ret;
uint32_t chunk = search_chunk(s,sector_num);
if(chunk>=s->n_chunks)
return -1;
s->current_chunk = s->n_chunks;
switch(s->types[chunk]) {
case 0x80000005: { /* zlib compressed */
int i;
/* we need to buffer, because only the chunk as whole can be
* inflated. */
i=0;
do {
ret = bdrv_pread(bs->file, s->offsets[chunk] + i,
s->compressed_chunk+i, s->lengths[chunk]-i);
if(ret<0 && errno==EINTR)
ret=0;
i+=ret;
} while(ret>=0 && ret+i<s->lengths[chunk]);
if (ret != s->lengths[chunk])
return -1;
s->zstream.next_in = s->compressed_chunk;
s->zstream.avail_in = s->lengths[chunk];
s->zstream.next_out = s->uncompressed_chunk;
s->zstream.avail_out = 512*s->sectorcounts[chunk];
ret = inflateReset(&s->zstream);
if(ret != Z_OK)
return -1;
ret = inflate(&s->zstream, Z_FINISH);
if(ret != Z_STREAM_END || s->zstream.total_out != 512*s->sectorcounts[chunk])
return -1;
break; }
case 1: /* copy */
ret = bdrv_pread(bs->file, s->offsets[chunk],
s->uncompressed_chunk, s->lengths[chunk]);
if (ret != s->lengths[chunk])
return -1;
break;
case 2: /* zero */
memset(s->uncompressed_chunk, 0, 512*s->sectorcounts[chunk]);
break;
}
s->current_chunk = chunk;
}
return 0;
}
int qcow2_read_snapshots(BlockDriverState *bs)
{
BDRVQcowState *s = bs->opaque;
QCowSnapshotHeader h;
QCowSnapshot *sn;
int i, id_str_size, name_size;
int64_t offset;
uint32_t extra_data_size;
if (!s->nb_snapshots) {
s->snapshots = NULL;
s->snapshots_size = 0;
return 0;
}
offset = s->snapshots_offset;
s->snapshots = qemu_mallocz(s->nb_snapshots * sizeof(QCowSnapshot));
for(i = 0; i < s->nb_snapshots; i++) {
offset = align_offset(offset, 8);
if (bdrv_pread(s->hd, offset, &h, sizeof(h)) != sizeof(h))
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);
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);
offset += extra_data_size;
sn->id_str = qemu_malloc(id_str_size + 1);
if (bdrv_pread(s->hd, offset, sn->id_str, id_str_size) != id_str_size)
goto fail;
offset += id_str_size;
sn->id_str[id_str_size] = '\0';
sn->name = qemu_malloc(name_size + 1);
if (bdrv_pread(s->hd, offset, sn->name, name_size) != name_size)
goto fail;
offset += name_size;
sn->name[name_size] = '\0';
}
s->snapshots_size = offset - s->snapshots_offset;
return 0;
fail:
qcow2_free_snapshots(bs);
return -1;
}
static void test_sync_op_pread(BdrvChild *c)
{
uint8_t buf[512];
int ret;
/* Success */
ret = bdrv_pread(c, 0, buf, sizeof(buf));
g_assert_cmpint(ret, ==, 512);
/* Early error: Negative offset */
ret = bdrv_pread(c, -2, buf, sizeof(buf));
g_assert_cmpint(ret, ==, -EIO);
}
static int cloop_open(BlockDriverState *bs, int flags)
{
BDRVCloopState *s = bs->opaque;
uint32_t offsets_size, max_compressed_block_size = 1, i;
bs->read_only = 1;
/* read header */
if (bdrv_pread(bs->file, 128, &s->block_size, 4) < 4) {
goto cloop_close;
}
s->block_size = be32_to_cpu(s->block_size);
if (bdrv_pread(bs->file, 128 + 4, &s->n_blocks, 4) < 4) {
goto cloop_close;
}
s->n_blocks = be32_to_cpu(s->n_blocks);
/* read offsets */
offsets_size = s->n_blocks * sizeof(uint64_t);
s->offsets = g_malloc(offsets_size);
if (bdrv_pread(bs->file, 128 + 4 + 4, s->offsets, offsets_size) <
offsets_size) {
goto cloop_close;
}
for(i=0;i<s->n_blocks;i++) {
s->offsets[i] = be64_to_cpu(s->offsets[i]);
if (i > 0) {
uint32_t size = s->offsets[i] - s->offsets[i - 1];
if (size > max_compressed_block_size) {
max_compressed_block_size = size;
}
}
}
/* initialize zlib engine */
s->compressed_block = g_malloc(max_compressed_block_size + 1);
s->uncompressed_block = g_malloc(s->block_size);
if (inflateInit(&s->zstream) != Z_OK) {
goto cloop_close;
}
s->current_block = s->n_blocks;
s->sectors_per_block = s->block_size/512;
bs->total_sectors = s->n_blocks * s->sectors_per_block;
qemu_co_mutex_init(&s->lock);
return 0;
cloop_close:
return -1;
}
static int vmdk_open_desc_file(BlockDriverState *bs, int flags,
int64_t desc_offset)
{
int ret;
char buf[2048];
char ct[128];
BDRVVmdkState *s = bs->opaque;
ret = bdrv_pread(bs->file, desc_offset, buf, sizeof(buf));
if (ret < 0) {
return ret;
}
buf[2047] = '\0';
if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) {
return -EINVAL;
}
if (strcmp(ct, "monolithicFlat") &&
strcmp(ct, "twoGbMaxExtentSparse") &&
strcmp(ct, "twoGbMaxExtentFlat")) {
fprintf(stderr,
"VMDK: Not supported image type \"%s\""".\n", ct);
return -ENOTSUP;
}
s->desc_offset = 0;
return vmdk_parse_extents(buf, bs, bs->file->filename);
}
static int vmdk_open_vmdk3(BlockDriverState *bs,
BlockDriverState *file,
int flags)
{
int ret;
uint32_t magic;
VMDK3Header header;
VmdkExtent *extent;
ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header));
if (ret < 0) {
return ret;
}
extent = vmdk_add_extent(bs,
bs->file, false,
le32_to_cpu(header.disk_sectors),
le32_to_cpu(header.l1dir_offset) << 9,
0, 1 << 6, 1 << 9,
le32_to_cpu(header.granularity));
ret = vmdk_init_tables(bs, extent);
if (ret) {
/* free extent allocated by vmdk_add_extent */
vmdk_free_last_extent(bs);
}
return ret;
}
static int vmdk_parent_open(BlockDriverState *bs)
{
char *p_name;
char desc[DESC_SIZE + 1];
BDRVVmdkState *s = bs->opaque;
int ret;
desc[DESC_SIZE] = '\0';
ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
if (ret < 0) {
return ret;
}
p_name = strstr(desc, "parentFileNameHint");
if (p_name != NULL) {
char *end_name;
p_name += sizeof("parentFileNameHint") + 1;
end_name = strchr(p_name, '\"');
if (end_name == NULL) {
return -EINVAL;
}
if ((end_name - p_name) > sizeof(bs->backing_file) - 1) {
return -EINVAL;
}
pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
}
return 0;
}
static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid)
{
char desc[DESC_SIZE], tmp_desc[DESC_SIZE];
char *p_name, *tmp_str;
BDRVVmdkState *s = bs->opaque;
int ret;
ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
if (ret < 0) {
return ret;
}
desc[DESC_SIZE - 1] = '\0';
tmp_str = strstr(desc, "parentCID");
if (tmp_str == NULL) {
return -EINVAL;
}
pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str);
p_name = strstr(desc, "CID");
if (p_name != NULL) {
p_name += sizeof("CID");
snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid);
pstrcat(desc, sizeof(desc), tmp_desc);
}
ret = bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE);
if (ret < 0) {
return ret;
}
return 0;
}
static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent)
{
char desc[DESC_SIZE];
uint32_t cid = 0xffffffff;
const char *p_name, *cid_str;
size_t cid_str_size;
BDRVVmdkState *s = bs->opaque;
int ret;
ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
if (ret < 0) {
return 0;
}
if (parent) {
cid_str = "parentCID";
cid_str_size = sizeof("parentCID");
} else {
cid_str = "CID";
cid_str_size = sizeof("CID");
}
desc[DESC_SIZE - 1] = '\0';
p_name = strstr(desc, cid_str);
if (p_name != NULL) {
p_name += cid_str_size;
sscanf(p_name, "%x", &cid);
}
return cid;
}
static off_t read_off(BlockDriverState *bs, int64_t offset)
{
uint64_t buffer;
if (bdrv_pread(bs->file, offset, &buffer, 8) < 8)
return 0;
return be64_to_cpu(buffer);
}
static inline int cloop_read_block(BlockDriverState *bs, int block_num)
{
BDRVCloopState *s = bs->opaque;
if (s->current_block != block_num) {
int ret;
uint32_t bytes = s->offsets[block_num + 1] - s->offsets[block_num];
ret = bdrv_pread(bs->file->bs, s->offsets[block_num],
s->compressed_block, bytes);
if (ret != bytes) {
return -1;
}
s->zstream.next_in = s->compressed_block;
s->zstream.avail_in = bytes;
s->zstream.next_out = s->uncompressed_block;
s->zstream.avail_out = s->block_size;
ret = inflateReset(&s->zstream);
if (ret != Z_OK) {
return -1;
}
ret = inflate(&s->zstream, Z_FINISH);
if (ret != Z_STREAM_END || s->zstream.total_out != s->block_size) {
return -1;
}
s->current_block = block_num;
}
return 0;
}
static int do_pread(char *buf, int64_t offset, int count, int *total)
{
*total = bdrv_pread(bs, offset, (uint8_t *)buf, count);
if (*total < 0)
return *total;
return 1;
}
/* Reads num_sectors from the log (all log sectors are 4096 bytes),
* into buffer 'buffer'. Upon return, *sectors_read will contain
* the number of sectors successfully read.
*
* It is assumed that 'buffer' is already allocated, and of sufficient
* size (i.e. >= 4096*num_sectors).
*
* If 'peek' is true, then the tail (read) pointer for the circular buffer is
* not modified.
*
* 0 is returned on success, -errno otherwise. */
static int vhdx_log_read_sectors(BlockDriverState *bs, VHDXLogEntries *log,
uint32_t *sectors_read, void *buffer,
uint32_t num_sectors, bool peek)
{
int ret = 0;
uint64_t offset;
uint32_t read;
read = log->read;
*sectors_read = 0;
while (num_sectors) {
if (read == log->write) {
/* empty */
break;
}
offset = log->offset + read;
ret = bdrv_pread(bs->file, offset, buffer, VHDX_LOG_SECTOR_SIZE);
if (ret < 0) {
goto exit;
}
read = vhdx_log_inc_idx(read, log->length);
*sectors_read = *sectors_read + 1;
num_sectors--;
}
exit:
if (!peek) {
log->read = read;
}
return ret;
}
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;
}
static off_t read_uint32(BlockDriverState *bs, int64_t offset)
{
uint32_t buffer;
if (bdrv_pread(bs->file, offset, &buffer, 4) < 4)
return 0;
return be32_to_cpu(buffer);
}
int qcow2_snapshot_load_tmp(BlockDriverState *bs, const char *snapshot_name)
{
int i, snapshot_index, l1_size2;
BDRVQcowState *s = bs->opaque;
QCowSnapshot *sn;
snapshot_index = find_snapshot_by_id_or_name(bs, snapshot_name);
if (snapshot_index < 0) {
return -ENOENT;
}
sn = &s->snapshots[snapshot_index];
s->l1_size = sn->l1_size;
l1_size2 = s->l1_size * sizeof(uint64_t);
if (s->l1_table != NULL) {
g_free(s->l1_table);
}
s->l1_table_offset = sn->l1_table_offset;
s->l1_table = g_malloc0(align_offset(l1_size2, 512));
if (bdrv_pread(bs->file, sn->l1_table_offset,
s->l1_table, l1_size2) != l1_size2) {
return -1;
}
for(i = 0; i < s->l1_size; i++) {
be64_to_cpus(&s->l1_table[i]);
}
return 0;
}
/* This is where we get a request from a caller to read something */
static BlockDriverAIOCB *tar_aio_readv(BlockDriverState *bs,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque)
{
BDRVTarState *s = bs->opaque;
SparseCache *sparse;
int64_t sec_file = sector_num + s->file_sec;
int64_t start = sector_num * SECTOR_SIZE;
int64_t end = start + (nb_sectors * SECTOR_SIZE);
int i;
TarAIOCB *acb;
for (i = 0; i < s->sparse_num; i++) {
sparse = &s->sparse[i];
if (sparse->start > end) {
/* We expect the cache to be start increasing */
break;
} else if ((sparse->start < start) && (sparse->end <= start)) {
/* sparse before our offset */
sec_file -= (sparse->end - sparse->start) / SECTOR_SIZE;
} else if ((sparse->start <= start) && (sparse->end >= end)) {
/* all our sectors are sparse */
char *buf = g_malloc0(nb_sectors * SECTOR_SIZE);
acb = qemu_aio_get(&tar_aiocb_info, bs, cb, opaque);
qemu_iovec_from_buf(qiov, 0, buf, nb_sectors * SECTOR_SIZE);
g_free(buf);
acb->bh = qemu_bh_new(tar_sparse_cb, acb);
qemu_bh_schedule(acb->bh);
return &acb->common;
} else if (((sparse->start >= start) && (sparse->start < end)) ||
((sparse->end >= start) && (sparse->end < end))) {
/* we're semi-sparse (worst case) */
/* let's go synchronous and read all sectors individually */
char *buf = g_malloc(nb_sectors * SECTOR_SIZE);
uint64_t offs;
for (offs = 0; offs < (nb_sectors * SECTOR_SIZE);
offs += SECTOR_SIZE) {
bdrv_pread(bs, (sector_num * SECTOR_SIZE) + offs,
buf + offs, SECTOR_SIZE);
}
qemu_iovec_from_buf(qiov, 0, buf, nb_sectors * SECTOR_SIZE);
acb = qemu_aio_get(&tar_aiocb_info, bs, cb, opaque);
acb->bh = qemu_bh_new(tar_sparse_cb, acb);
qemu_bh_schedule(acb->bh);
return &acb->common;
}
}
return bdrv_aio_readv(s->hd, sec_file, qiov, nb_sectors,
cb, opaque);
}
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 */
if (sn->l1_size > QCOW_MAX_L1_SIZE / sizeof(uint64_t)) {
error_setg(errp, "Snapshot L1 table too large");
return -EFBIG;
}
new_l1_bytes = sn->l1_size * sizeof(uint64_t);
new_l1_table = qemu_try_blockalign(bs->file->bs,
align_offset(new_l1_bytes, 512));
if (new_l1_table == NULL) {
return -ENOMEM;
}
ret = bdrv_pread(bs->file->bs, 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;
}
static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
BDRVParallelsState *s = bs->opaque;
int i;
struct parallels_header ph;
int ret;
bs->read_only = 1; // no write support yet
ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph));
if (ret < 0) {
goto fail;
}
if (memcmp(ph.magic, HEADER_MAGIC, 16) ||
(le32_to_cpu(ph.version) != HEADER_VERSION)) {
ret = -EMEDIUMTYPE;
goto fail;
}
bs->total_sectors = le32_to_cpu(ph.nb_sectors);
s->tracks = le32_to_cpu(ph.tracks);
s->catalog_size = le32_to_cpu(ph.catalog_entries);
s->catalog_bitmap = g_malloc(s->catalog_size * 4);
ret = bdrv_pread(bs->file, 64, s->catalog_bitmap, s->catalog_size * 4);
if (ret < 0) {
goto fail;
}
for (i = 0; i < s->catalog_size; i++)
le32_to_cpus(&s->catalog_bitmap[i]);
qemu_co_mutex_init(&s->lock);
return 0;
fail:
g_free(s->catalog_bitmap);
return ret;
}
static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent)
{
int ret;
int l1_size, i;
/* read the L1 table */
l1_size = extent->l1_size * sizeof(uint32_t);
extent->l1_table = g_malloc(l1_size);
ret = bdrv_pread(extent->file,
extent->l1_table_offset,
extent->l1_table,
l1_size);
if (ret < 0) {
goto fail_l1;
}
for (i = 0; i < extent->l1_size; i++) {
le32_to_cpus(&extent->l1_table[i]);
}
if (extent->l1_backup_table_offset) {
extent->l1_backup_table = g_malloc(l1_size);
ret = bdrv_pread(extent->file,
extent->l1_backup_table_offset,
extent->l1_backup_table,
l1_size);
if (ret < 0) {
goto fail_l1b;
}
for (i = 0; i < extent->l1_size; i++) {
le32_to_cpus(&extent->l1_backup_table[i]);
}
}
extent->l2_cache =
g_malloc(extent->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
return 0;
fail_l1b:
g_free(extent->l1_backup_table);
fail_l1:
g_free(extent->l1_table);
return ret;
}
/* load_bitmap_data
* @bitmap_table entries must satisfy specification constraints.
* @bitmap must be cleared */
static int load_bitmap_data(BlockDriverState *bs,
const uint64_t *bitmap_table,
uint32_t bitmap_table_size,
BdrvDirtyBitmap *bitmap)
{
int ret = 0;
BDRVQcow2State *s = bs->opaque;
uint64_t offset, limit;
uint64_t bm_size = bdrv_dirty_bitmap_size(bitmap);
uint8_t *buf = NULL;
uint64_t i, tab_size =
size_to_clusters(s,
bdrv_dirty_bitmap_serialization_size(bitmap, 0, bm_size));
if (tab_size != bitmap_table_size || tab_size > BME_MAX_TABLE_SIZE) {
return -EINVAL;
}
buf = g_malloc(s->cluster_size);
limit = bytes_covered_by_bitmap_cluster(s, bitmap);
for (i = 0, offset = 0; i < tab_size; ++i, offset += limit) {
uint64_t count = MIN(bm_size - offset, limit);
uint64_t entry = bitmap_table[i];
uint64_t data_offset = entry & BME_TABLE_ENTRY_OFFSET_MASK;
assert(check_table_entry(entry, s->cluster_size) == 0);
if (data_offset == 0) {
if (entry & BME_TABLE_ENTRY_FLAG_ALL_ONES) {
bdrv_dirty_bitmap_deserialize_ones(bitmap, offset, count,
false);
} else {
/* No need to deserialize zeros because the dirty bitmap is
* already cleared */
}
} else {
ret = bdrv_pread(bs->file, data_offset, buf, s->cluster_size);
if (ret < 0) {
goto finish;
}
bdrv_dirty_bitmap_deserialize_part(bitmap, buf, offset, count,
false);
}
}
ret = 0;
bdrv_dirty_bitmap_deserialize_finish(bitmap);
finish:
g_free(buf);
return ret;
}
static int dmg_read_plist_xml(BlockDriverState *bs, DmgHeaderState *ds,
uint64_t info_begin, uint64_t info_length)
{
BDRVDMGState *s = bs->opaque;
int ret;
uint8_t *buffer = NULL;
char *data_begin, *data_end;
/* Have at least some length to avoid NULL for g_malloc. Attempt to set a
* safe upper cap on the data length. A test sample had a XML length of
* about 1 MiB. */
if (info_length == 0 || info_length > 16 * 1024 * 1024) {
ret = -EINVAL;
goto fail;
}
buffer = g_malloc(info_length + 1);
buffer[info_length] = '\0';
ret = bdrv_pread(bs->file, info_begin, buffer, info_length);
if (ret != info_length) {
ret = -EINVAL;
goto fail;
}
/* look for <data>...</data>. The data is 284 (0x11c) bytes after base64
* decode. The actual data element has 431 (0x1af) bytes which includes tabs
* and line feeds. */
data_end = (char *)buffer;
while ((data_begin = strstr(data_end, "<data>")) != NULL) {
guchar *mish;
gsize out_len = 0;
data_begin += 6;
data_end = strstr(data_begin, "</data>");
/* malformed XML? */
if (data_end == NULL) {
ret = -EINVAL;
goto fail;
}
*data_end++ = '\0';
mish = g_base64_decode(data_begin, &out_len);
ret = dmg_read_mish_block(s, ds, mish, (uint32_t)out_len);
g_free(mish);
if (ret < 0) {
goto fail;
}
}
ret = 0;
fail:
g_free(buffer);
return ret;
}
static int read_uint32(BlockDriverState *bs, int64_t offset, uint32_t *result)
{
uint32_t buffer;
int ret;
ret = bdrv_pread(bs->file, offset, &buffer, 4);
if (ret < 0) {
return ret;
}
*result = be32_to_cpu(buffer);
return 0;
}
/**
* Read a string of known length from the image file
*
* @file: Image file
* @offset: File offset to start of string, in bytes
* @n: String length in bytes
* @buf: Destination buffer
* @buflen: Destination buffer length in bytes
* @ret: 0 on success, -errno on failure
*
* The string is NUL-terminated.
*/
static int qed_read_string(BlockDriverState *file, uint64_t offset, size_t n,
char *buf, size_t buflen)
{
int ret;
if (n >= buflen) {
return -EINVAL;
}
ret = bdrv_pread(file, offset, buf, n);
if (ret < 0) {
return ret;
}
buf[n] = '\0';
return 0;
}
static void rtas_nvram_fetch(PowerPCCPU *cpu, sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
sPAPRNVRAM *nvram = spapr->nvram;
hwaddr offset, buffer, len;
int alen;
void *membuf;
if ((nargs != 3) || (nret != 2)) {
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return;
}
if (!nvram) {
rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
rtas_st(rets, 1, 0);
return;
}
offset = rtas_ld(args, 0);
buffer = rtas_ld(args, 1);
len = rtas_ld(args, 2);
if (((offset + len) < offset)
|| ((offset + len) > nvram->size)) {
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
rtas_st(rets, 1, 0);
return;
}
membuf = cpu_physical_memory_map(buffer, &len, 1);
if (nvram->drive) {
alen = bdrv_pread(nvram->drive, offset, membuf, len);
} else {
assert(nvram->buf);
memcpy(membuf, nvram->buf + offset, len);
alen = len;
}
cpu_physical_memory_unmap(membuf, len, 1, len);
rtas_st(rets, 0, (alen < len) ? RTAS_OUT_HW_ERROR : RTAS_OUT_SUCCESS);
rtas_st(rets, 1, (alen < 0) ? 0 : alen);
}
/* copy the snapshot 'snapshot_name' into the current disk image */
int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id)
{
BDRVQcowState *s = bs->opaque;
QCowSnapshot *sn;
int i, snapshot_index;
int cur_l1_bytes, sn_l1_bytes;
snapshot_index = find_snapshot_by_id_or_name(bs, snapshot_id);
if (snapshot_index < 0)
return -ENOENT;
sn = &s->snapshots[snapshot_index];
if (qcow2_update_snapshot_refcount(bs, s->l1_table_offset, s->l1_size, -1) < 0)
goto fail;
if (qcow2_grow_l1_table(bs, sn->l1_size, true) < 0)
goto fail;
cur_l1_bytes = s->l1_size * sizeof(uint64_t);
sn_l1_bytes = sn->l1_size * sizeof(uint64_t);
if (cur_l1_bytes > sn_l1_bytes) {
memset(s->l1_table + sn->l1_size, 0, cur_l1_bytes - sn_l1_bytes);
}
/* copy the snapshot l1 table to the current l1 table */
if (bdrv_pread(bs->file, sn->l1_table_offset,
s->l1_table, sn_l1_bytes) < 0)
goto fail;
if (bdrv_pwrite_sync(bs->file, s->l1_table_offset,
s->l1_table, cur_l1_bytes) < 0)
goto fail;
for(i = 0; i < s->l1_size; i++) {
be64_to_cpus(&s->l1_table[i]);
}
if (qcow2_update_snapshot_refcount(bs, s->l1_table_offset, s->l1_size, 1) < 0)
goto fail;
#ifdef DEBUG_ALLOC
qcow2_check_refcounts(bs);
#endif
return 0;
fail:
return -EIO;
}
static int parallels_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
while (nb_sectors > 0) {
int64_t position = seek_to_sector(bs, sector_num);
if (position >= 0) {
if (bdrv_pread(bs->file, position, buf, 512) != 512)
return -1;
} else {
memset(buf, 0, 512);
}
nb_sectors--;
sector_num++;
buf += 512;
}
return 0;
}
static ssize_t block_crypto_read_func(QCryptoBlock *block,
size_t offset,
uint8_t *buf,
size_t buflen,
Error **errp,
void *opaque)
{
BlockDriverState *bs = opaque;
ssize_t ret;
ret = bdrv_pread(bs->file, offset, buf, buflen);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not read encryption header");
return ret;
}
return ret;
}
