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xemu/block/vmdk.c
Pavel Butsykin b2c622d365 vmdk: add vmdk_co_pwritev_compressed 
Added implementation of the vmdk_co_pwritev_compressed function that
will allow us to safely use compressed writes for the vmdk from running
VMs.

Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Jeff Cody <jcody@redhat.com>
CC: Markus Armbruster <armbru@redhat.com>
CC: Eric Blake <eblake@redhat.com>
CC: John Snow <jsnow@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2016-09-05 19:06:48 +02:00

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/*
* Block driver for the VMDK format
*
* Copyright (c) 2004 Fabrice Bellard
* Copyright (c) 2005 Filip Navara
*
* 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 "block/block_int.h"
#include "sysemu/block-backend.h"
#include "qapi/qmp/qerror.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "qemu/bswap.h"
#include "migration/migration.h"
#include "qemu/cutils.h"
#include <zlib.h>
#define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D')
#define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V')
#define VMDK4_COMPRESSION_DEFLATE 1
#define VMDK4_FLAG_NL_DETECT (1 << 0)
#define VMDK4_FLAG_RGD (1 << 1)
/* Zeroed-grain enable bit */
#define VMDK4_FLAG_ZERO_GRAIN (1 << 2)
#define VMDK4_FLAG_COMPRESS (1 << 16)
#define VMDK4_FLAG_MARKER (1 << 17)
#define VMDK4_GD_AT_END 0xffffffffffffffffULL
#define VMDK_GTE_ZEROED 0x1
/* VMDK internal error codes */
#define VMDK_OK 0
#define VMDK_ERROR (-1)
/* Cluster not allocated */
#define VMDK_UNALLOC (-2)
#define VMDK_ZEROED (-3)
#define BLOCK_OPT_ZEROED_GRAIN "zeroed_grain"
typedef struct {
uint32_t version;
uint32_t flags;
uint32_t disk_sectors;
uint32_t granularity;
uint32_t l1dir_offset;
uint32_t l1dir_size;
uint32_t file_sectors;
uint32_t cylinders;
uint32_t heads;
uint32_t sectors_per_track;
} QEMU_PACKED VMDK3Header;
typedef struct {
uint32_t version;
uint32_t flags;
uint64_t capacity;
uint64_t granularity;
uint64_t desc_offset;
uint64_t desc_size;
/* Number of GrainTableEntries per GrainTable */
uint32_t num_gtes_per_gt;
uint64_t rgd_offset;
uint64_t gd_offset;
uint64_t grain_offset;
char filler[1];
char check_bytes[4];
uint16_t compressAlgorithm;
} QEMU_PACKED VMDK4Header;
#define L2_CACHE_SIZE 16
typedef struct VmdkExtent {
BdrvChild *file;
bool flat;
bool compressed;
bool has_marker;
bool has_zero_grain;
int version;
int64_t sectors;
int64_t end_sector;
int64_t flat_start_offset;
int64_t l1_table_offset;
int64_t l1_backup_table_offset;
uint32_t *l1_table;
uint32_t *l1_backup_table;
unsigned int l1_size;
uint32_t l1_entry_sectors;
unsigned int l2_size;
uint32_t *l2_cache;
uint32_t l2_cache_offsets[L2_CACHE_SIZE];
uint32_t l2_cache_counts[L2_CACHE_SIZE];
int64_t cluster_sectors;
int64_t next_cluster_sector;
char *type;
} VmdkExtent;
typedef struct BDRVVmdkState {
CoMutex lock;
uint64_t desc_offset;
bool cid_updated;
bool cid_checked;
uint32_t cid;
uint32_t parent_cid;
int num_extents;
/* Extent array with num_extents entries, ascend ordered by address */
VmdkExtent *extents;
Error *migration_blocker;
char *create_type;
} BDRVVmdkState;
typedef struct VmdkMetaData {
unsigned int l1_index;
unsigned int l2_index;
unsigned int l2_offset;
int valid;
uint32_t *l2_cache_entry;
} VmdkMetaData;
typedef struct VmdkGrainMarker {
uint64_t lba;
uint32_t size;
uint8_t data[0];
} QEMU_PACKED VmdkGrainMarker;
enum {
MARKER_END_OF_STREAM = 0,
MARKER_GRAIN_TABLE = 1,
MARKER_GRAIN_DIRECTORY = 2,
MARKER_FOOTER = 3,
};
static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename)
{
uint32_t magic;
if (buf_size < 4) {
return 0;
}
magic = be32_to_cpu(*(uint32_t *)buf);
if (magic == VMDK3_MAGIC ||
magic == VMDK4_MAGIC) {
return 100;
} else {
const char *p = (const char *)buf;
const char *end = p + buf_size;
while (p < end) {
if (*p == '#') {
/* skip comment line */
while (p < end && *p != '\n') {
p++;
}
p++;
continue;
}
if (*p == ' ') {
while (p < end && *p == ' ') {
p++;
}
/* skip '\r' if windows line endings used. */
if (p < end && *p == '\r') {
p++;
}
/* only accept blank lines before 'version=' line */
if (p == end || *p != '\n') {
return 0;
}
p++;
continue;
}
if (end - p >= strlen("version=X\n")) {
if (strncmp("version=1\n", p, strlen("version=1\n")) == 0 ||
strncmp("version=2\n", p, strlen("version=2\n")) == 0) {
return 100;
}
}
if (end - p >= strlen("version=X\r\n")) {
if (strncmp("version=1\r\n", p, strlen("version=1\r\n")) == 0 ||
strncmp("version=2\r\n", p, strlen("version=2\r\n")) == 0) {
return 100;
}
}
return 0;
}
return 0;
}
}
#define SECTOR_SIZE 512
#define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */
#define BUF_SIZE 4096
#define HEADER_SIZE 512 /* first sector of 512 bytes */
static void vmdk_free_extents(BlockDriverState *bs)
{
int i;
BDRVVmdkState *s = bs->opaque;
VmdkExtent *e;
for (i = 0; i < s->num_extents; i++) {
e = &s->extents[i];
g_free(e->l1_table);
g_free(e->l2_cache);
g_free(e->l1_backup_table);
g_free(e->type);
if (e->file != bs->file) {
bdrv_unref_child(bs, e->file);
}
}
g_free(s->extents);
}
static void vmdk_free_last_extent(BlockDriverState *bs)
{
BDRVVmdkState *s = bs->opaque;
if (s->num_extents == 0) {
return;
}
s->num_extents--;
s->extents = g_renew(VmdkExtent, s->extents, s->num_extents);
}
static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent)
{
char *desc;
uint32_t cid = 0xffffffff;
const char *p_name, *cid_str;
size_t cid_str_size;
BDRVVmdkState *s = bs->opaque;
int ret;
desc = g_malloc0(DESC_SIZE);
ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
if (ret < 0) {
g_free(desc);
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, "%" SCNx32, &cid);
}
g_free(desc);
return cid;
}
static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid)
{
char *desc, *tmp_desc;
char *p_name, *tmp_str;
BDRVVmdkState *s = bs->opaque;
int ret = 0;
desc = g_malloc0(DESC_SIZE);
tmp_desc = g_malloc0(DESC_SIZE);
ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
if (ret < 0) {
goto out;
}
desc[DESC_SIZE - 1] = '\0';
tmp_str = strstr(desc, "parentCID");
if (tmp_str == NULL) {
ret = -EINVAL;
goto out;
}
pstrcpy(tmp_desc, DESC_SIZE, tmp_str);
p_name = strstr(desc, "CID");
if (p_name != NULL) {
p_name += sizeof("CID");
snprintf(p_name, DESC_SIZE - (p_name - desc), "%" PRIx32 "\n", cid);
pstrcat(desc, DESC_SIZE, tmp_desc);
}
ret = bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE);
out:
g_free(desc);
g_free(tmp_desc);
return ret;
}
static int vmdk_is_cid_valid(BlockDriverState *bs)
{
BDRVVmdkState *s = bs->opaque;
uint32_t cur_pcid;
if (!s->cid_checked && bs->backing) {
BlockDriverState *p_bs = bs->backing->bs;
cur_pcid = vmdk_read_cid(p_bs, 0);
if (s->parent_cid != cur_pcid) {
/* CID not valid */
return 0;
}
}
s->cid_checked = true;
/* CID valid */
return 1;
}
/* We have nothing to do for VMDK reopen, stubs just return success */
static int vmdk_reopen_prepare(BDRVReopenState *state,
BlockReopenQueue *queue, Error **errp)
{
assert(state != NULL);
assert(state->bs != NULL);
return 0;
}
static int vmdk_parent_open(BlockDriverState *bs)
{
char *p_name;
char *desc;
BDRVVmdkState *s = bs->opaque;
int ret;
desc = g_malloc0(DESC_SIZE + 1);
ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
if (ret < 0) {
goto out;
}
ret = 0;
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) {
ret = -EINVAL;
goto out;
}
if ((end_name - p_name) > sizeof(bs->backing_file) - 1) {
ret = -EINVAL;
goto out;
}
pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
}
out:
g_free(desc);
return ret;
}
/* Create and append extent to the extent array. Return the added VmdkExtent
* address. return NULL if allocation failed. */
static int vmdk_add_extent(BlockDriverState *bs,
BdrvChild *file, bool flat, int64_t sectors,
int64_t l1_offset, int64_t l1_backup_offset,
uint32_t l1_size,
int l2_size, uint64_t cluster_sectors,
VmdkExtent **new_extent,
Error **errp)
{
VmdkExtent *extent;
BDRVVmdkState *s = bs->opaque;
int64_t nb_sectors;
if (cluster_sectors > 0x200000) {
/* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */
error_setg(errp, "Invalid granularity, image may be corrupt");
return -EFBIG;
}
if (l1_size > 512 * 1024 * 1024) {
/* Although with big capacity and small l1_entry_sectors, we can get a
* big l1_size, we don't want unbounded value to allocate the table.
* Limit it to 512M, which is 16PB for default cluster and L2 table
* size */
error_setg(errp, "L1 size too big");
return -EFBIG;
}
nb_sectors = bdrv_nb_sectors(file->bs);
if (nb_sectors < 0) {
return nb_sectors;
}
s->extents = g_renew(VmdkExtent, s->extents, s->num_extents + 1);
extent = &s->extents[s->num_extents];
s->num_extents++;
memset(extent, 0, sizeof(VmdkExtent));
extent->file = file;
extent->flat = flat;
extent->sectors = sectors;
extent->l1_table_offset = l1_offset;
extent->l1_backup_table_offset = l1_backup_offset;
extent->l1_size = l1_size;
extent->l1_entry_sectors = l2_size * cluster_sectors;
extent->l2_size = l2_size;
extent->cluster_sectors = flat ? sectors : cluster_sectors;
extent->next_cluster_sector = ROUND_UP(nb_sectors, cluster_sectors);
if (s->num_extents > 1) {
extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
} else {
extent->end_sector = extent->sectors;
}
bs->total_sectors = extent->end_sector;
if (new_extent) {
*new_extent = extent;
}
return 0;
}
static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent,
Error **errp)
{
int ret;
size_t l1_size;
int i;
/* read the L1 table */
l1_size = extent->l1_size * sizeof(uint32_t);
extent->l1_table = g_try_malloc(l1_size);
if (l1_size && extent->l1_table == NULL) {
return -ENOMEM;
}
ret = bdrv_pread(extent->file,
extent->l1_table_offset,
extent->l1_table,
l1_size);
if (ret < 0) {
error_setg_errno(errp, -ret,
"Could not read l1 table from extent '%s'",
extent->file->bs->filename);
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_try_malloc(l1_size);
if (l1_size && extent->l1_backup_table == NULL) {
ret = -ENOMEM;
goto fail_l1;
}
ret = bdrv_pread(extent->file,
extent->l1_backup_table_offset,
extent->l1_backup_table,
l1_size);
if (ret < 0) {
error_setg_errno(errp, -ret,
"Could not read l1 backup table from extent '%s'",
extent->file->bs->filename);
goto fail_l1b;
}
for (i = 0; i < extent->l1_size; i++) {
le32_to_cpus(&extent->l1_backup_table[i]);
}
}
extent->l2_cache =
g_new(uint32_t, extent->l2_size * L2_CACHE_SIZE);
return 0;
fail_l1b:
g_free(extent->l1_backup_table);
fail_l1:
g_free(extent->l1_table);
return ret;
}
static int vmdk_open_vmfs_sparse(BlockDriverState *bs,
BdrvChild *file,
int flags, Error **errp)
{
int ret;
uint32_t magic;
VMDK3Header header;
VmdkExtent *extent;
ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header));
if (ret < 0) {
error_setg_errno(errp, -ret,
"Could not read header from file '%s'",
file->bs->filename);
return ret;
}
ret = vmdk_add_extent(bs, file, false,
le32_to_cpu(header.disk_sectors),
(int64_t)le32_to_cpu(header.l1dir_offset) << 9,
0,
le32_to_cpu(header.l1dir_size),
4096,
le32_to_cpu(header.granularity),
&extent,
errp);
if (ret < 0) {
return ret;
}
ret = vmdk_init_tables(bs, extent, errp);
if (ret) {
/* free extent allocated by vmdk_add_extent */
vmdk_free_last_extent(bs);
}
return ret;
}
static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf,
QDict *options, Error **errp);
static char *vmdk_read_desc(BdrvChild *file, uint64_t desc_offset, Error **errp)
{
int64_t size;
char *buf;
int ret;
size = bdrv_getlength(file->bs);
if (size < 0) {
error_setg_errno(errp, -size, "Could not access file");
return NULL;
}
if (size < 4) {
/* Both descriptor file and sparse image must be much larger than 4
* bytes, also callers of vmdk_read_desc want to compare the first 4
* bytes with VMDK4_MAGIC, let's error out if less is read. */
error_setg(errp, "File is too small, not a valid image");
return NULL;
}
size = MIN(size, (1 << 20) - 1); /* avoid unbounded allocation */
buf = g_malloc(size + 1);
ret = bdrv_pread(file, desc_offset, buf, size);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not read from file");
g_free(buf);
return NULL;
}
buf[ret] = 0;
return buf;
}
static int vmdk_open_vmdk4(BlockDriverState *bs,
BdrvChild *file,
int flags, QDict *options, Error **errp)
{
int ret;
uint32_t magic;
uint32_t l1_size, l1_entry_sectors;
VMDK4Header header;
VmdkExtent *extent;
BDRVVmdkState *s = bs->opaque;
int64_t l1_backup_offset = 0;
bool compressed;
ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header));
if (ret < 0) {
error_setg_errno(errp, -ret,
"Could not read header from file '%s'",
file->bs->filename);
return -EINVAL;
}
if (header.capacity == 0) {
uint64_t desc_offset = le64_to_cpu(header.desc_offset);
if (desc_offset) {
char *buf = vmdk_read_desc(file, desc_offset << 9, errp);
if (!buf) {
return -EINVAL;
}
ret = vmdk_open_desc_file(bs, flags, buf, options, errp);
g_free(buf);
return ret;
}
}
if (!s->create_type) {
s->create_type = g_strdup("monolithicSparse");
}
if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) {
/*
* The footer takes precedence over the header, so read it in. The
* footer starts at offset -1024 from the end: One sector for the
* footer, and another one for the end-of-stream marker.
*/
struct {
struct {
uint64_t val;
uint32_t size;
uint32_t type;
uint8_t pad[512 - 16];
} QEMU_PACKED footer_marker;
uint32_t magic;
VMDK4Header header;
uint8_t pad[512 - 4 - sizeof(VMDK4Header)];
struct {
uint64_t val;
uint32_t size;
uint32_t type;
uint8_t pad[512 - 16];
} QEMU_PACKED eos_marker;
} QEMU_PACKED footer;
ret = bdrv_pread(file,
bs->file->bs->total_sectors * 512 - 1536,
&footer, sizeof(footer));
if (ret < 0) {
error_setg_errno(errp, -ret, "Failed to read footer");
return ret;
}
/* Some sanity checks for the footer */
if (be32_to_cpu(footer.magic) != VMDK4_MAGIC ||
le32_to_cpu(footer.footer_marker.size) != 0 ||
le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER ||
le64_to_cpu(footer.eos_marker.val) != 0 ||
le32_to_cpu(footer.eos_marker.size) != 0 ||
le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM)
{
error_setg(errp, "Invalid footer");
return -EINVAL;
}
header = footer.header;
}
compressed =
le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE;
if (le32_to_cpu(header.version) > 3) {
error_setg(errp, "Unsupported VMDK version %" PRIu32,
le32_to_cpu(header.version));
return -ENOTSUP;
} else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR) &&
!compressed) {
/* VMware KB 2064959 explains that version 3 added support for
* persistent changed block tracking (CBT), and backup software can
* read it as version=1 if it doesn't care about the changed area
* information. So we are safe to enable read only. */
error_setg(errp, "VMDK version 3 must be read only");
return -EINVAL;
}
if (le32_to_cpu(header.num_gtes_per_gt) > 512) {
error_setg(errp, "L2 table size too big");
return -EINVAL;
}
l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gt)
* le64_to_cpu(header.granularity);
if (l1_entry_sectors == 0) {
error_setg(errp, "L1 entry size is invalid");
return -EINVAL;
}
l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1)
/ l1_entry_sectors;
if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) {
l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9;
}
if (bdrv_nb_sectors(file->bs) < le64_to_cpu(header.grain_offset)) {
error_setg(errp, "File truncated, expecting at least %" PRId64 " bytes",
(int64_t)(le64_to_cpu(header.grain_offset)
* BDRV_SECTOR_SIZE));
return -EINVAL;
}
ret = vmdk_add_extent(bs, file, false,
le64_to_cpu(header.capacity),
le64_to_cpu(header.gd_offset) << 9,
l1_backup_offset,
l1_size,
le32_to_cpu(header.num_gtes_per_gt),
le64_to_cpu(header.granularity),
&extent,
errp);
if (ret < 0) {
return ret;
}
extent->compressed =
le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE;
if (extent->compressed) {
g_free(s->create_type);
s->create_type = g_strdup("streamOptimized");
}
extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER;
extent->version = le32_to_cpu(header.version);
extent->has_zero_grain = le32_to_cpu(header.flags) & VMDK4_FLAG_ZERO_GRAIN;
ret = vmdk_init_tables(bs, extent, errp);
if (ret) {
/* free extent allocated by vmdk_add_extent */
vmdk_free_last_extent(bs);
}
return ret;
}
/* find an option value out of descriptor file */
static int vmdk_parse_description(const char *desc, const char *opt_name,
char *buf, int buf_size)
{
char *opt_pos, *opt_end;
const char *end = desc + strlen(desc);
opt_pos = strstr(desc, opt_name);
if (!opt_pos) {
return VMDK_ERROR;
}
/* Skip "=\"" following opt_name */
opt_pos += strlen(opt_name) + 2;
if (opt_pos >= end) {
return VMDK_ERROR;
}
opt_end = opt_pos;
while (opt_end < end && *opt_end != '"') {
opt_end++;
}
if (opt_end == end || buf_size < opt_end - opt_pos + 1) {
return VMDK_ERROR;
}
pstrcpy(buf, opt_end - opt_pos + 1, opt_pos);
return VMDK_OK;
}
/* Open an extent file and append to bs array */
static int vmdk_open_sparse(BlockDriverState *bs, BdrvChild *file, int flags,
char *buf, QDict *options, Error **errp)
{
uint32_t magic;
magic = ldl_be_p(buf);
switch (magic) {
case VMDK3_MAGIC:
return vmdk_open_vmfs_sparse(bs, file, flags, errp);
break;
case VMDK4_MAGIC:
return vmdk_open_vmdk4(bs, file, flags, options, errp);
break;
default:
error_setg(errp, "Image not in VMDK format");
return -EINVAL;
break;
}
}
static const char *next_line(const char *s)
{
while (*s) {
if (*s == '\n') {
return s + 1;
}
s++;
}
return s;
}
static int vmdk_parse_extents(const char *desc, BlockDriverState *bs,
const char *desc_file_path, QDict *options,
Error **errp)
{
int ret;
int matches;
char access[11];
char type[11];
char fname[512];
const char *p, *np;
int64_t sectors = 0;
int64_t flat_offset;
char *extent_path;
BdrvChild *extent_file;
BDRVVmdkState *s = bs->opaque;
VmdkExtent *extent;
char extent_opt_prefix[32];
Error *local_err = NULL;
for (p = desc; *p; p = next_line(p)) {
/* parse extent line in one of below formats:
*
* RW [size in sectors] FLAT "file-name.vmdk" OFFSET
* RW [size in sectors] SPARSE "file-name.vmdk"
* RW [size in sectors] VMFS "file-name.vmdk"
* RW [size in sectors] VMFSSPARSE "file-name.vmdk"
*/
flat_offset = -1;
matches = sscanf(p, "%10s %" SCNd64 " %10s \"%511[^\n\r\"]\" %" SCNd64,
access, &sectors, type, fname, &flat_offset);
if (matches < 4 || strcmp(access, "RW")) {
continue;
} else if (!strcmp(type, "FLAT")) {
if (matches != 5 || flat_offset < 0) {
goto invalid;
}
} else if (!strcmp(type, "VMFS")) {
if (matches == 4) {
flat_offset = 0;
} else {
goto invalid;
}
} else if (matches != 4) {
goto invalid;
}
if (sectors <= 0 ||
(strcmp(type, "FLAT") && strcmp(type, "SPARSE") &&
strcmp(type, "VMFS") && strcmp(type, "VMFSSPARSE")) ||
(strcmp(access, "RW"))) {
continue;
}
if (!path_is_absolute(fname) && !path_has_protocol(fname) &&
!desc_file_path[0])
{
error_setg(errp, "Cannot use relative extent paths with VMDK "
"descriptor file '%s'", bs->file->bs->filename);
return -EINVAL;
}
extent_path = g_malloc0(PATH_MAX);
path_combine(extent_path, PATH_MAX, desc_file_path, fname);
ret = snprintf(extent_opt_prefix, 32, "extents.%d", s->num_extents);
assert(ret < 32);
extent_file = bdrv_open_child(extent_path, options, extent_opt_prefix,
bs, &child_file, false, &local_err);
g_free(extent_path);
if (local_err) {
error_propagate(errp, local_err);
return -EINVAL;
}
/* save to extents array */
if (!strcmp(type, "FLAT") || !strcmp(type, "VMFS")) {
/* FLAT extent */
ret = vmdk_add_extent(bs, extent_file, true, sectors,
0, 0, 0, 0, 0, &extent, errp);
if (ret < 0) {
bdrv_unref_child(bs, extent_file);
return ret;
}
extent->flat_start_offset = flat_offset << 9;
} else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) {
/* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/
char *buf = vmdk_read_desc(extent_file, 0, errp);
if (!buf) {
ret = -EINVAL;
} else {
ret = vmdk_open_sparse(bs, extent_file, bs->open_flags, buf,
options, errp);
}
g_free(buf);
if (ret) {
bdrv_unref_child(bs, extent_file);
return ret;
}
extent = &s->extents[s->num_extents - 1];
} else {
error_setg(errp, "Unsupported extent type '%s'", type);
bdrv_unref_child(bs, extent_file);
return -ENOTSUP;
}
extent->type = g_strdup(type);
}
return 0;
invalid:
np = next_line(p);
assert(np != p);
if (np[-1] == '\n') {
np--;
}
error_setg(errp, "Invalid extent line: %.*s", (int)(np - p), p);
return -EINVAL;
}
static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf,
QDict *options, Error **errp)
{
int ret;
char ct[128];
BDRVVmdkState *s = bs->opaque;
if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) {
error_setg(errp, "invalid VMDK image descriptor");
ret = -EINVAL;
goto exit;
}
if (strcmp(ct, "monolithicFlat") &&
strcmp(ct, "vmfs") &&
strcmp(ct, "vmfsSparse") &&
strcmp(ct, "twoGbMaxExtentSparse") &&
strcmp(ct, "twoGbMaxExtentFlat")) {
error_setg(errp, "Unsupported image type '%s'", ct);
ret = -ENOTSUP;
goto exit;
}
s->create_type = g_strdup(ct);
s->desc_offset = 0;
ret = vmdk_parse_extents(buf, bs, bs->file->bs->exact_filename, options,
errp);
exit:
return ret;
}
static int vmdk_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
char *buf;
int ret;
BDRVVmdkState *s = bs->opaque;
uint32_t magic;
buf = vmdk_read_desc(bs->file, 0, errp);
if (!buf) {
return -EINVAL;
}
magic = ldl_be_p(buf);
switch (magic) {
case VMDK3_MAGIC:
case VMDK4_MAGIC:
ret = vmdk_open_sparse(bs, bs->file, flags, buf, options,
errp);
s->desc_offset = 0x200;
break;
default:
ret = vmdk_open_desc_file(bs, flags, buf, options, errp);
break;
}
if (ret) {
goto fail;
}
/* try to open parent images, if exist */
ret = vmdk_parent_open(bs);
if (ret) {
goto fail;
}
s->cid = vmdk_read_cid(bs, 0);
s->parent_cid = vmdk_read_cid(bs, 1);
qemu_co_mutex_init(&s->lock);
/* Disable migration when VMDK images are used */
error_setg(&s->migration_blocker, "The vmdk format used by node '%s' "
"does not support live migration",
bdrv_get_device_or_node_name(bs));
migrate_add_blocker(s->migration_blocker);
g_free(buf);
return 0;
fail:
g_free(buf);
g_free(s->create_type);
s->create_type = NULL;
vmdk_free_extents(bs);
return ret;
}
static void vmdk_refresh_limits(BlockDriverState *bs, Error **errp)
{
BDRVVmdkState *s = bs->opaque;
int i;
for (i = 0; i < s->num_extents; i++) {
if (!s->extents[i].flat) {
bs->bl.pwrite_zeroes_alignment =
MAX(bs->bl.pwrite_zeroes_alignment,
s->extents[i].cluster_sectors << BDRV_SECTOR_BITS);
}
}
}
/**
* get_whole_cluster
*
* Copy backing file's cluster that covers @sector_num, otherwise write zero,
* to the cluster at @cluster_sector_num.
*
* If @skip_start_sector < @skip_end_sector, the relative range
* [@skip_start_sector, @skip_end_sector) is not copied or written, and leave
* it for call to write user data in the request.
*/
static int get_whole_cluster(BlockDriverState *bs,
VmdkExtent *extent,
uint64_t cluster_offset,
uint64_t offset,
uint64_t skip_start_bytes,
uint64_t skip_end_bytes)
{
int ret = VMDK_OK;
int64_t cluster_bytes;
uint8_t *whole_grain;
/* For COW, align request sector_num to cluster start */
cluster_bytes = extent->cluster_sectors << BDRV_SECTOR_BITS;
offset = QEMU_ALIGN_DOWN(offset, cluster_bytes);
whole_grain = qemu_blockalign(bs, cluster_bytes);
if (!bs->backing) {
memset(whole_grain, 0, skip_start_bytes);
memset(whole_grain + skip_end_bytes, 0, cluster_bytes - skip_end_bytes);
}
assert(skip_end_bytes <= cluster_bytes);
/* we will be here if it's first write on non-exist grain(cluster).
* try to read from parent image, if exist */
if (bs->backing && !vmdk_is_cid_valid(bs)) {
ret = VMDK_ERROR;
goto exit;
}
/* Read backing data before skip range */
if (skip_start_bytes > 0) {
if (bs->backing) {
ret = bdrv_pread(bs->backing, offset, whole_grain,
skip_start_bytes);
if (ret < 0) {
ret = VMDK_ERROR;
goto exit;
}
}
ret = bdrv_pwrite(extent->file, cluster_offset, whole_grain,
skip_start_bytes);
if (ret < 0) {
ret = VMDK_ERROR;
goto exit;
}
}
/* Read backing data after skip range */
if (skip_end_bytes < cluster_bytes) {
if (bs->backing) {
ret = bdrv_pread(bs->backing, offset + skip_end_bytes,
whole_grain + skip_end_bytes,
cluster_bytes - skip_end_bytes);
if (ret < 0) {
ret = VMDK_ERROR;
goto exit;
}
}
ret = bdrv_pwrite(extent->file, cluster_offset + skip_end_bytes,
whole_grain + skip_end_bytes,
cluster_bytes - skip_end_bytes);
if (ret < 0) {
ret = VMDK_ERROR;
goto exit;
}
}
ret = VMDK_OK;
exit:
qemu_vfree(whole_grain);
return ret;
}
static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data,
uint32_t offset)
{
offset = cpu_to_le32(offset);
/* update L2 table */
if (bdrv_pwrite_sync(extent->file,
((int64_t)m_data->l2_offset * 512)
+ (m_data->l2_index * sizeof(offset)),
&offset, sizeof(offset)) < 0) {
return VMDK_ERROR;
}
/* update backup L2 table */
if (extent->l1_backup_table_offset != 0) {
m_data->l2_offset = extent->l1_backup_table[m_data->l1_index];
if (bdrv_pwrite_sync(extent->file,
((int64_t)m_data->l2_offset * 512)
+ (m_data->l2_index * sizeof(offset)),
&offset, sizeof(offset)) < 0) {
return VMDK_ERROR;
}
}
if (m_data->l2_cache_entry) {
*m_data->l2_cache_entry = offset;
}
return VMDK_OK;
}
/**
* get_cluster_offset
*
* Look up cluster offset in extent file by sector number, and store in
* @cluster_offset.
*
* For flat extents, the start offset as parsed from the description file is
* returned.
*
* For sparse extents, look up in L1, L2 table. If allocate is true, return an
* offset for a new cluster and update L2 cache. If there is a backing file,
* COW is done before returning; otherwise, zeroes are written to the allocated
* cluster. Both COW and zero writing skips the sector range
* [@skip_start_sector, @skip_end_sector) passed in by caller, because caller
* has new data to write there.
*
* Returns: VMDK_OK if cluster exists and mapped in the image.
* VMDK_UNALLOC if cluster is not mapped and @allocate is false.
* VMDK_ERROR if failed.
*/
static int get_cluster_offset(BlockDriverState *bs,
VmdkExtent *extent,
VmdkMetaData *m_data,
uint64_t offset,
bool allocate,
uint64_t *cluster_offset,
uint64_t skip_start_bytes,
uint64_t skip_end_bytes)
{
unsigned int l1_index, l2_offset, l2_index;
int min_index, i, j;
uint32_t min_count, *l2_table;
bool zeroed = false;
int64_t ret;
int64_t cluster_sector;
if (m_data) {
m_data->valid = 0;
}
if (extent->flat) {
*cluster_offset = extent->flat_start_offset;
return VMDK_OK;
}
offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE;
l1_index = (offset >> 9) / extent->l1_entry_sectors;
if (l1_index >= extent->l1_size) {
return VMDK_ERROR;
}
l2_offset = extent->l1_table[l1_index];
if (!l2_offset) {
return VMDK_UNALLOC;
}
for (i = 0; i < L2_CACHE_SIZE; i++) {
if (l2_offset == extent->l2_cache_offsets[i]) {
/* increment the hit count */
if (++extent->l2_cache_counts[i] == 0xffffffff) {
for (j = 0; j < L2_CACHE_SIZE; j++) {
extent->l2_cache_counts[j] >>= 1;
}
}
l2_table = extent->l2_cache + (i * extent->l2_size);
goto found;
}
}
/* not found: load a new entry in the least used one */
min_index = 0;
min_count = 0xffffffff;
for (i = 0; i < L2_CACHE_SIZE; i++) {
if (extent->l2_cache_counts[i] < min_count) {
min_count = extent->l2_cache_counts[i];
min_index = i;
}
}
l2_table = extent->l2_cache + (min_index * extent->l2_size);
if (bdrv_pread(extent->file,
(int64_t)l2_offset * 512,
l2_table,
extent->l2_size * sizeof(uint32_t)
) != extent->l2_size * sizeof(uint32_t)) {
return VMDK_ERROR;
}
extent->l2_cache_offsets[min_index] = l2_offset;
extent->l2_cache_counts[min_index] = 1;
found:
l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
cluster_sector = le32_to_cpu(l2_table[l2_index]);
if (extent->has_zero_grain && cluster_sector == VMDK_GTE_ZEROED) {
zeroed = true;
}
if (!cluster_sector || zeroed) {
if (!allocate) {
return zeroed ? VMDK_ZEROED : VMDK_UNALLOC;
}
cluster_sector = extent->next_cluster_sector;
extent->next_cluster_sector += extent->cluster_sectors;
/* First of all we write grain itself, to avoid race condition
* that may to corrupt the image.
* This problem may occur because of insufficient space on host disk
* or inappropriate VM shutdown.
*/
ret = get_whole_cluster(bs, extent, cluster_sector * BDRV_SECTOR_SIZE,
offset, skip_start_bytes, skip_end_bytes);
if (ret) {
return ret;
}
if (m_data) {
m_data->valid = 1;
m_data->l1_index = l1_index;
m_data->l2_index = l2_index;
m_data->l2_offset = l2_offset;
m_data->l2_cache_entry = &l2_table[l2_index];
}
}
*cluster_offset = cluster_sector << BDRV_SECTOR_BITS;
return VMDK_OK;
}
static VmdkExtent *find_extent(BDRVVmdkState *s,
int64_t sector_num, VmdkExtent *start_hint)
{
VmdkExtent *extent = start_hint;
if (!extent) {
extent = &s->extents[0];
}
while (extent < &s->extents[s->num_extents]) {
if (sector_num < extent->end_sector) {
return extent;
}
extent++;
}
return NULL;
}
static inline uint64_t vmdk_find_offset_in_cluster(VmdkExtent *extent,
int64_t offset)
{
uint64_t extent_begin_offset, extent_relative_offset;
uint64_t cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE;
extent_begin_offset =
(extent->end_sector - extent->sectors) * BDRV_SECTOR_SIZE;
extent_relative_offset = offset - extent_begin_offset;
return extent_relative_offset % cluster_size;
}
static inline uint64_t vmdk_find_index_in_cluster(VmdkExtent *extent,
int64_t sector_num)
{
uint64_t offset;
offset = vmdk_find_offset_in_cluster(extent, sector_num * BDRV_SECTOR_SIZE);
return offset / BDRV_SECTOR_SIZE;
}
static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file)
{
BDRVVmdkState *s = bs->opaque;
int64_t index_in_cluster, n, ret;
uint64_t offset;
VmdkExtent *extent;
extent = find_extent(s, sector_num, NULL);
if (!extent) {
return 0;
}
qemu_co_mutex_lock(&s->lock);
ret = get_cluster_offset(bs, extent, NULL,
sector_num * 512, false, &offset,
0, 0);
qemu_co_mutex_unlock(&s->lock);
index_in_cluster = vmdk_find_index_in_cluster(extent, sector_num);
switch (ret) {
case VMDK_ERROR:
ret = -EIO;
break;
case VMDK_UNALLOC:
ret = 0;
break;
case VMDK_ZEROED:
ret = BDRV_BLOCK_ZERO;
break;
case VMDK_OK:
ret = BDRV_BLOCK_DATA;
if (!extent->compressed) {
ret |= BDRV_BLOCK_OFFSET_VALID;
ret |= (offset + (index_in_cluster << BDRV_SECTOR_BITS))
& BDRV_BLOCK_OFFSET_MASK;
}
*file = extent->file->bs;
break;
}
n = extent->cluster_sectors - index_in_cluster;
if (n > nb_sectors) {
n = nb_sectors;
}
*pnum = n;
return ret;
}
static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset,
int64_t offset_in_cluster, QEMUIOVector *qiov,
uint64_t qiov_offset, uint64_t n_bytes,
uint64_t offset)
{
int ret;
VmdkGrainMarker *data = NULL;
uLongf buf_len;
QEMUIOVector local_qiov;
struct iovec iov;
int64_t write_offset;
int64_t write_end_sector;
if (extent->compressed) {
void *compressed_data;
if (!extent->has_marker) {
ret = -EINVAL;
goto out;
}
buf_len = (extent->cluster_sectors << 9) * 2;
data = g_malloc(buf_len + sizeof(VmdkGrainMarker));
compressed_data = g_malloc(n_bytes);
qemu_iovec_to_buf(qiov, qiov_offset, compressed_data, n_bytes);
ret = compress(data->data, &buf_len, compressed_data, n_bytes);
g_free(compressed_data);
if (ret != Z_OK || buf_len == 0) {
ret = -EINVAL;
goto out;
}
data->lba = offset >> BDRV_SECTOR_BITS;
data->size = buf_len;
n_bytes = buf_len + sizeof(VmdkGrainMarker);
iov = (struct iovec) {
.iov_base = data,
.iov_len = n_bytes,
};
qemu_iovec_init_external(&local_qiov, &iov, 1);
} else {
qemu_iovec_init(&local_qiov, qiov->niov);
qemu_iovec_concat(&local_qiov, qiov, qiov_offset, n_bytes);
}
write_offset = cluster_offset + offset_in_cluster,
ret = bdrv_co_pwritev(extent->file, write_offset, n_bytes,
&local_qiov, 0);
write_end_sector = DIV_ROUND_UP(write_offset + n_bytes, BDRV_SECTOR_SIZE);
if (extent->compressed) {
extent->next_cluster_sector = write_end_sector;
} else {
extent->next_cluster_sector = MAX(extent->next_cluster_sector,
write_end_sector);
}
if (ret < 0) {
goto out;
}
ret = 0;
out:
g_free(data);
if (!extent->compressed) {
qemu_iovec_destroy(&local_qiov);
}
return ret;
}
static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset,
int64_t offset_in_cluster, QEMUIOVector *qiov,
int bytes)
{
int ret;
int cluster_bytes, buf_bytes;
uint8_t *cluster_buf, *compressed_data;
uint8_t *uncomp_buf;
uint32_t data_len;
VmdkGrainMarker *marker;
uLongf buf_len;
if (!extent->compressed) {
ret = bdrv_co_preadv(extent->file,
cluster_offset + offset_in_cluster, bytes,
qiov, 0);
if (ret < 0) {
return ret;
}
return 0;
}
cluster_bytes = extent->cluster_sectors * 512;
/* Read two clusters in case GrainMarker + compressed data > one cluster */
buf_bytes = cluster_bytes * 2;
cluster_buf = g_malloc(buf_bytes);
uncomp_buf = g_malloc(cluster_bytes);
ret = bdrv_pread(extent->file,
cluster_offset,
cluster_buf, buf_bytes);
if (ret < 0) {
goto out;
}
compressed_data = cluster_buf;
buf_len = cluster_bytes;
data_len = cluster_bytes;
if (extent->has_marker) {
marker = (VmdkGrainMarker *)cluster_buf;
compressed_data = marker->data;
data_len = le32_to_cpu(marker->size);
}
if (!data_len || data_len > buf_bytes) {
ret = -EINVAL;
goto out;
}
ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len);
if (ret != Z_OK) {
ret = -EINVAL;
goto out;
}
if (offset_in_cluster < 0 ||
offset_in_cluster + bytes > buf_len) {
ret = -EINVAL;
goto out;
}
qemu_iovec_from_buf(qiov, 0, uncomp_buf + offset_in_cluster, bytes);
ret = 0;
out:
g_free(uncomp_buf);
g_free(cluster_buf);
return ret;
}
static int coroutine_fn
vmdk_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags)
{
BDRVVmdkState *s = bs->opaque;
int ret;
uint64_t n_bytes, offset_in_cluster;
VmdkExtent *extent = NULL;
QEMUIOVector local_qiov;
uint64_t cluster_offset;
uint64_t bytes_done = 0;
qemu_iovec_init(&local_qiov, qiov->niov);
qemu_co_mutex_lock(&s->lock);
while (bytes > 0) {
extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent);
if (!extent) {
ret = -EIO;
goto fail;
}
ret = get_cluster_offset(bs, extent, NULL,
offset, false, &cluster_offset, 0, 0);
offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset);
n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE
- offset_in_cluster);
if (ret != VMDK_OK) {
/* if not allocated, try to read from parent image, if exist */
if (bs->backing && ret != VMDK_ZEROED) {
if (!vmdk_is_cid_valid(bs)) {
ret = -EINVAL;
goto fail;
}
qemu_iovec_reset(&local_qiov);
qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
ret = bdrv_co_preadv(bs->backing, offset, n_bytes,
&local_qiov, 0);
if (ret < 0) {
goto fail;
}
} else {
qemu_iovec_memset(qiov, bytes_done, 0, n_bytes);
}
} else {
qemu_iovec_reset(&local_qiov);
qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
ret = vmdk_read_extent(extent, cluster_offset, offset_in_cluster,
&local_qiov, n_bytes);
if (ret) {
goto fail;
}
}
bytes -= n_bytes;
offset += n_bytes;
bytes_done += n_bytes;
}
ret = 0;
fail:
qemu_co_mutex_unlock(&s->lock);
qemu_iovec_destroy(&local_qiov);
return ret;
}
/**
* vmdk_write:
* @zeroed: buf is ignored (data is zero), use zeroed_grain GTE feature
* if possible, otherwise return -ENOTSUP.
* @zero_dry_run: used for zeroed == true only, don't update L2 table, just try
* with each cluster. By dry run we can find if the zero write
* is possible without modifying image data.
*
* Returns: error code with 0 for success.
*/
static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
uint64_t bytes, QEMUIOVector *qiov,
bool zeroed, bool zero_dry_run)
{
BDRVVmdkState *s = bs->opaque;
VmdkExtent *extent = NULL;
int ret;
int64_t offset_in_cluster, n_bytes;
uint64_t cluster_offset;
uint64_t bytes_done = 0;
VmdkMetaData m_data;
if (DIV_ROUND_UP(offset, BDRV_SECTOR_SIZE) > bs->total_sectors) {
error_report("Wrong offset: offset=0x%" PRIx64
" total_sectors=0x%" PRIx64,
offset, bs->total_sectors);
return -EIO;
}
while (bytes > 0) {
extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent);
if (!extent) {
return -EIO;
}
offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset);
n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE
- offset_in_cluster);
ret = get_cluster_offset(bs, extent, &m_data, offset,
!(extent->compressed || zeroed),
&cluster_offset, offset_in_cluster,
offset_in_cluster + n_bytes);
if (extent->compressed) {
if (ret == VMDK_OK) {
/* Refuse write to allocated cluster for streamOptimized */
error_report("Could not write to allocated cluster"
" for streamOptimized");
return -EIO;
} else {
/* allocate */
ret = get_cluster_offset(bs, extent, &m_data, offset,
true, &cluster_offset, 0, 0);
}
}
if (ret == VMDK_ERROR) {
return -EINVAL;
}
if (zeroed) {
/* Do zeroed write, buf is ignored */
if (extent->has_zero_grain &&
offset_in_cluster == 0 &&
n_bytes >= extent->cluster_sectors * BDRV_SECTOR_SIZE) {
n_bytes = extent->cluster_sectors * BDRV_SECTOR_SIZE;
if (!zero_dry_run) {
/* update L2 tables */
if (vmdk_L2update(extent, &m_data, VMDK_GTE_ZEROED)
!= VMDK_OK) {
return -EIO;
}
}
} else {
return -ENOTSUP;
}
} else {
ret = vmdk_write_extent(extent, cluster_offset, offset_in_cluster,
qiov, bytes_done, n_bytes, offset);
if (ret) {
return ret;
}
if (m_data.valid) {
/* update L2 tables */
if (vmdk_L2update(extent, &m_data,
cluster_offset >> BDRV_SECTOR_BITS)
!= VMDK_OK) {
return -EIO;
}
}
}
bytes -= n_bytes;
offset += n_bytes;
bytes_done += n_bytes;
/* update CID on the first write every time the virtual disk is
* opened */
if (!s->cid_updated) {
ret = vmdk_write_cid(bs, g_random_int());
if (ret < 0) {
return ret;
}
s->cid_updated = true;
}
}
return 0;
}
static int coroutine_fn
vmdk_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags)
{
int ret;
BDRVVmdkState *s = bs->opaque;
qemu_co_mutex_lock(&s->lock);
ret = vmdk_pwritev(bs, offset, bytes, qiov, false, false);
qemu_co_mutex_unlock(&s->lock);
return ret;
}
static int coroutine_fn
vmdk_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset,
uint64_t bytes, QEMUIOVector *qiov)
{
return vmdk_co_pwritev(bs, offset, bytes, qiov, 0);
}
static int coroutine_fn vmdk_co_pwrite_zeroes(BlockDriverState *bs,
int64_t offset,
int bytes,
BdrvRequestFlags flags)
{
int ret;
BDRVVmdkState *s = bs->opaque;
qemu_co_mutex_lock(&s->lock);
/* write zeroes could fail if sectors not aligned to cluster, test it with
* dry_run == true before really updating image */
ret = vmdk_pwritev(bs, offset, bytes, NULL, true, true);
if (!ret) {
ret = vmdk_pwritev(bs, offset, bytes, NULL, true, false);
}
qemu_co_mutex_unlock(&s->lock);
return ret;
}
static int vmdk_create_extent(const char *filename, int64_t filesize,
bool flat, bool compress, bool zeroed_grain,
QemuOpts *opts, Error **errp)
{
int ret, i;
BlockBackend *blk = NULL;
VMDK4Header header;
Error *local_err = NULL;
uint32_t tmp, magic, grains, gd_sectors, gt_size, gt_count;
uint32_t *gd_buf = NULL;
int gd_buf_size;
ret = bdrv_create_file(filename, opts, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
goto exit;
}
blk = blk_new_open(filename, NULL, NULL,
BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err);
if (blk == NULL) {
error_propagate(errp, local_err);
ret = -EIO;
goto exit;
}
blk_set_allow_write_beyond_eof(blk, true);
if (flat) {
ret = blk_truncate(blk, filesize);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not truncate file");
}
goto exit;
}
magic = cpu_to_be32(VMDK4_MAGIC);
memset(&header, 0, sizeof(header));
if (compress) {
header.version = 3;
} else if (zeroed_grain) {
header.version = 2;
} else {
header.version = 1;
}
header.flags = VMDK4_FLAG_RGD | VMDK4_FLAG_NL_DETECT
| (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0)
| (zeroed_grain ? VMDK4_FLAG_ZERO_GRAIN : 0);
header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0;
header.capacity = filesize / BDRV_SECTOR_SIZE;
header.granularity = 128;
header.num_gtes_per_gt = BDRV_SECTOR_SIZE;
grains = DIV_ROUND_UP(filesize / BDRV_SECTOR_SIZE, header.granularity);
gt_size = DIV_ROUND_UP(header.num_gtes_per_gt * sizeof(uint32_t),
BDRV_SECTOR_SIZE);
gt_count = DIV_ROUND_UP(grains, header.num_gtes_per_gt);
gd_sectors = DIV_ROUND_UP(gt_count * sizeof(uint32_t), BDRV_SECTOR_SIZE);
header.desc_offset = 1;
header.desc_size = 20;
header.rgd_offset = header.desc_offset + header.desc_size;
header.gd_offset = header.rgd_offset + gd_sectors + (gt_size * gt_count);
header.grain_offset =
ROUND_UP(header.gd_offset + gd_sectors + (gt_size * gt_count),
header.granularity);
/* swap endianness for all header fields */
header.version = cpu_to_le32(header.version);
header.flags = cpu_to_le32(header.flags);
header.capacity = cpu_to_le64(header.capacity);
header.granularity = cpu_to_le64(header.granularity);
header.num_gtes_per_gt = cpu_to_le32(header.num_gtes_per_gt);
header.desc_offset = cpu_to_le64(header.desc_offset);
header.desc_size = cpu_to_le64(header.desc_size);
header.rgd_offset = cpu_to_le64(header.rgd_offset);
header.gd_offset = cpu_to_le64(header.gd_offset);
header.grain_offset = cpu_to_le64(header.grain_offset);
header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm);
header.check_bytes[0] = 0xa;
header.check_bytes[1] = 0x20;
header.check_bytes[2] = 0xd;
header.check_bytes[3] = 0xa;
/* write all the data */
ret = blk_pwrite(blk, 0, &magic, sizeof(magic), 0);
if (ret < 0) {
error_setg(errp, QERR_IO_ERROR);
goto exit;
}
ret = blk_pwrite(blk, sizeof(magic), &header, sizeof(header), 0);
if (ret < 0) {
error_setg(errp, QERR_IO_ERROR);
goto exit;
}
ret = blk_truncate(blk, le64_to_cpu(header.grain_offset) << 9);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not truncate file");
goto exit;
}
/* write grain directory */
gd_buf_size = gd_sectors * BDRV_SECTOR_SIZE;
gd_buf = g_malloc0(gd_buf_size);
for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_sectors;
i < gt_count; i++, tmp += gt_size) {
gd_buf[i] = cpu_to_le32(tmp);
}
ret = blk_pwrite(blk, le64_to_cpu(header.rgd_offset) * BDRV_SECTOR_SIZE,
gd_buf, gd_buf_size, 0);
if (ret < 0) {
error_setg(errp, QERR_IO_ERROR);
goto exit;
}
/* write backup grain directory */
for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_sectors;
i < gt_count; i++, tmp += gt_size) {
gd_buf[i] = cpu_to_le32(tmp);
}
ret = blk_pwrite(blk, le64_to_cpu(header.gd_offset) * BDRV_SECTOR_SIZE,
gd_buf, gd_buf_size, 0);
if (ret < 0) {
error_setg(errp, QERR_IO_ERROR);
goto exit;
}
ret = 0;
exit:
if (blk) {
blk_unref(blk);
}
g_free(gd_buf);
return ret;
}
static int filename_decompose(const char *filename, char *path, char *prefix,
char *postfix, size_t buf_len, Error **errp)
{
const char *p, *q;
if (filename == NULL || !strlen(filename)) {
error_setg(errp, "No filename provided");
return VMDK_ERROR;
}
p = strrchr(filename, '/');
if (p == NULL) {
p = strrchr(filename, '\\');
}
if (p == NULL) {
p = strrchr(filename, ':');
}
if (p != NULL) {
p++;
if (p - filename >= buf_len) {
return VMDK_ERROR;
}
pstrcpy(path, p - filename + 1, filename);
} else {
p = filename;
path[0] = '\0';
}
q = strrchr(p, '.');
if (q == NULL) {
pstrcpy(prefix, buf_len, p);
postfix[0] = '\0';
} else {
if (q - p >= buf_len) {
return VMDK_ERROR;
}
pstrcpy(prefix, q - p + 1, p);
pstrcpy(postfix, buf_len, q);
}
return VMDK_OK;
}
static int vmdk_create(const char *filename, QemuOpts *opts, Error **errp)
{
int idx = 0;
BlockBackend *new_blk = NULL;
Error *local_err = NULL;
char *desc = NULL;
int64_t total_size = 0, filesize;
char *adapter_type = NULL;
char *backing_file = NULL;
char *hw_version = NULL;
char *fmt = NULL;
int ret = 0;
bool flat, split, compress;
GString *ext_desc_lines;
char *path = g_malloc0(PATH_MAX);
char *prefix = g_malloc0(PATH_MAX);
char *postfix = g_malloc0(PATH_MAX);
char *desc_line = g_malloc0(BUF_SIZE);
char *ext_filename = g_malloc0(PATH_MAX);
char *desc_filename = g_malloc0(PATH_MAX);
const int64_t split_size = 0x80000000; /* VMDK has constant split size */
const char *desc_extent_line;
char *parent_desc_line = g_malloc0(BUF_SIZE);
uint32_t parent_cid = 0xffffffff;
uint32_t number_heads = 16;
bool zeroed_grain = false;
uint32_t desc_offset = 0, desc_len;
const char desc_template[] =
"# Disk DescriptorFile\n"
"version=1\n"
"CID=%" PRIx32 "\n"
"parentCID=%" PRIx32 "\n"
"createType=\"%s\"\n"
"%s"
"\n"
"# Extent description\n"
"%s"
"\n"
"# The Disk Data Base\n"
"#DDB\n"
"\n"
"ddb.virtualHWVersion = \"%s\"\n"
"ddb.geometry.cylinders = \"%" PRId64 "\"\n"
"ddb.geometry.heads = \"%" PRIu32 "\"\n"
"ddb.geometry.sectors = \"63\"\n"
"ddb.adapterType = \"%s\"\n";
ext_desc_lines = g_string_new(NULL);
if (filename_decompose(filename, path, prefix, postfix, PATH_MAX, errp)) {
ret = -EINVAL;
goto exit;
}
/* Read out options */
total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
BDRV_SECTOR_SIZE);
adapter_type = qemu_opt_get_del(opts, BLOCK_OPT_ADAPTER_TYPE);
backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE);
hw_version = qemu_opt_get_del(opts, BLOCK_OPT_HWVERSION);
if (qemu_opt_get_bool_del(opts, BLOCK_OPT_COMPAT6, false)) {
if (strcmp(hw_version, "undefined")) {
error_setg(errp,
"compat6 cannot be enabled with hwversion set");
ret = -EINVAL;
goto exit;
}
g_free(hw_version);
hw_version = g_strdup("6");
}
if (strcmp(hw_version, "undefined") == 0) {
g_free(hw_version);
hw_version = g_strdup("4");
}
fmt = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT);
if (qemu_opt_get_bool_del(opts, BLOCK_OPT_ZEROED_GRAIN, false)) {
zeroed_grain = true;
}
if (!adapter_type) {
adapter_type = g_strdup("ide");
} else if (strcmp(adapter_type, "ide") &&
strcmp(adapter_type, "buslogic") &&
strcmp(adapter_type, "lsilogic") &&
strcmp(adapter_type, "legacyESX")) {
error_setg(errp, "Unknown adapter type: '%s'", adapter_type);
ret = -EINVAL;
goto exit;
}
if (strcmp(adapter_type, "ide") != 0) {
/* that's the number of heads with which vmware operates when
creating, exporting, etc. vmdk files with a non-ide adapter type */
number_heads = 255;
}
if (!fmt) {
/* Default format to monolithicSparse */
fmt = g_strdup("monolithicSparse");
} else if (strcmp(fmt, "monolithicFlat") &&
strcmp(fmt, "monolithicSparse") &&
strcmp(fmt, "twoGbMaxExtentSparse") &&
strcmp(fmt, "twoGbMaxExtentFlat") &&
strcmp(fmt, "streamOptimized")) {
error_setg(errp, "Unknown subformat: '%s'", fmt);
ret = -EINVAL;
goto exit;
}
split = !(strcmp(fmt, "twoGbMaxExtentFlat") &&
strcmp(fmt, "twoGbMaxExtentSparse"));
flat = !(strcmp(fmt, "monolithicFlat") &&
strcmp(fmt, "twoGbMaxExtentFlat"));
compress = !strcmp(fmt, "streamOptimized");
if (flat) {
desc_extent_line = "RW %" PRId64 " FLAT \"%s\" 0\n";
} else {
desc_extent_line = "RW %" PRId64 " SPARSE \"%s\"\n";
}
if (flat && backing_file) {
error_setg(errp, "Flat image can't have backing file");
ret = -ENOTSUP;
goto exit;
}
if (flat && zeroed_grain) {
error_setg(errp, "Flat image can't enable zeroed grain");
ret = -ENOTSUP;
goto exit;
}
if (backing_file) {
BlockBackend *blk;
char *full_backing = g_new0(char, PATH_MAX);
bdrv_get_full_backing_filename_from_filename(filename, backing_file,
full_backing, PATH_MAX,
&local_err);
if (local_err) {
g_free(full_backing);
error_propagate(errp, local_err);
ret = -ENOENT;
goto exit;
}
blk = blk_new_open(full_backing, NULL, NULL,
BDRV_O_NO_BACKING, errp);
g_free(full_backing);
if (blk == NULL) {
ret = -EIO;
goto exit;
}
if (strcmp(blk_bs(blk)->drv->format_name, "vmdk")) {
blk_unref(blk);
ret = -EINVAL;
goto exit;
}
parent_cid = vmdk_read_cid(blk_bs(blk), 0);
blk_unref(blk);
snprintf(parent_desc_line, BUF_SIZE,
"parentFileNameHint=\"%s\"", backing_file);
}
/* Create extents */
filesize = total_size;
while (filesize > 0) {
int64_t size = filesize;
if (split && size > split_size) {
size = split_size;
}
if (split) {
snprintf(desc_filename, PATH_MAX, "%s-%c%03d%s",
prefix, flat ? 'f' : 's', ++idx, postfix);
} else if (flat) {
snprintf(desc_filename, PATH_MAX, "%s-flat%s", prefix, postfix);
} else {
snprintf(desc_filename, PATH_MAX, "%s%s", prefix, postfix);
}
snprintf(ext_filename, PATH_MAX, "%s%s", path, desc_filename);
if (vmdk_create_extent(ext_filename, size,
flat, compress, zeroed_grain, opts, errp)) {
ret = -EINVAL;
goto exit;
}
filesize -= size;
/* Format description line */
snprintf(desc_line, BUF_SIZE,
desc_extent_line, size / BDRV_SECTOR_SIZE, desc_filename);
g_string_append(ext_desc_lines, desc_line);
}
/* generate descriptor file */
desc = g_strdup_printf(desc_template,
g_random_int(),
parent_cid,
fmt,
parent_desc_line,
ext_desc_lines->str,
hw_version,
total_size /
(int64_t)(63 * number_heads * BDRV_SECTOR_SIZE),
number_heads,
adapter_type);
desc_len = strlen(desc);
/* the descriptor offset = 0x200 */
if (!split && !flat) {
desc_offset = 0x200;
} else {
ret = bdrv_create_file(filename, opts, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
goto exit;
}
}
new_blk = blk_new_open(filename, NULL, NULL,
BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err);
if (new_blk == NULL) {
error_propagate(errp, local_err);
ret = -EIO;
goto exit;
}
blk_set_allow_write_beyond_eof(new_blk, true);
ret = blk_pwrite(new_blk, desc_offset, desc, desc_len, 0);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not write description");
goto exit;
}
/* bdrv_pwrite write padding zeros to align to sector, we don't need that
* for description file */
if (desc_offset == 0) {
ret = blk_truncate(new_blk, desc_len);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not truncate file");
}
}
exit:
if (new_blk) {
blk_unref(new_blk);
}
g_free(adapter_type);
g_free(backing_file);
g_free(hw_version);
g_free(fmt);
g_free(desc);
g_free(path);
g_free(prefix);
g_free(postfix);
g_free(desc_line);
g_free(ext_filename);
g_free(desc_filename);
g_free(parent_desc_line);
g_string_free(ext_desc_lines, true);
return ret;
}
static void vmdk_close(BlockDriverState *bs)
{
BDRVVmdkState *s = bs->opaque;
vmdk_free_extents(bs);
g_free(s->create_type);
migrate_del_blocker(s->migration_blocker);
error_free(s->migration_blocker);
}
static coroutine_fn int vmdk_co_flush(BlockDriverState *bs)
{
BDRVVmdkState *s = bs->opaque;
int i, err;
int ret = 0;
for (i = 0; i < s->num_extents; i++) {
err = bdrv_co_flush(s->extents[i].file->bs);
if (err < 0) {
ret = err;
}
}
return ret;
}
static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs)
{
int i;
int64_t ret = 0;
int64_t r;
BDRVVmdkState *s = bs->opaque;
ret = bdrv_get_allocated_file_size(bs->file->bs);
if (ret < 0) {
return ret;
}
for (i = 0; i < s->num_extents; i++) {
if (s->extents[i].file == bs->file) {
continue;
}
r = bdrv_get_allocated_file_size(s->extents[i].file->bs);
if (r < 0) {
return r;
}
ret += r;
}
return ret;
}
static int vmdk_has_zero_init(BlockDriverState *bs)
{
int i;
BDRVVmdkState *s = bs->opaque;
/* If has a flat extent and its underlying storage doesn't have zero init,
* return 0. */
for (i = 0; i < s->num_extents; i++) {
if (s->extents[i].flat) {
if (!bdrv_has_zero_init(s->extents[i].file->bs)) {
return 0;
}
}
}
return 1;
}
static ImageInfo *vmdk_get_extent_info(VmdkExtent *extent)
{
ImageInfo *info = g_new0(ImageInfo, 1);
*info = (ImageInfo){
.filename = g_strdup(extent->file->bs->filename),
.format = g_strdup(extent->type),
.virtual_size = extent->sectors * BDRV_SECTOR_SIZE,
.compressed = extent->compressed,
.has_compressed = extent->compressed,
.cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE,
.has_cluster_size = !extent->flat,
};
return info;
}
static int vmdk_check(BlockDriverState *bs, BdrvCheckResult *result,
BdrvCheckMode fix)
{
BDRVVmdkState *s = bs->opaque;
VmdkExtent *extent = NULL;
int64_t sector_num = 0;
int64_t total_sectors = bdrv_nb_sectors(bs);
int ret;
uint64_t cluster_offset;
if (fix) {
return -ENOTSUP;
}
for (;;) {
if (sector_num >= total_sectors) {
return 0;
}
extent = find_extent(s, sector_num, extent);
if (!extent) {
fprintf(stderr,
"ERROR: could not find extent for sector %" PRId64 "\n",
sector_num);
break;
}
ret = get_cluster_offset(bs, extent, NULL,
sector_num << BDRV_SECTOR_BITS,
false, &cluster_offset, 0, 0);
if (ret == VMDK_ERROR) {
fprintf(stderr,
"ERROR: could not get cluster_offset for sector %"
PRId64 "\n", sector_num);
break;
}
if (ret == VMDK_OK &&
cluster_offset >= bdrv_getlength(extent->file->bs))
{
fprintf(stderr,
"ERROR: cluster offset for sector %"
PRId64 " points after EOF\n", sector_num);
break;
}
sector_num += extent->cluster_sectors;
}
result->corruptions++;
return 0;
}
static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs)
{
int i;
BDRVVmdkState *s = bs->opaque;
ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1);
ImageInfoList **next;
*spec_info = (ImageInfoSpecific){
.type = IMAGE_INFO_SPECIFIC_KIND_VMDK,
.u = {
.vmdk.data = g_new0(ImageInfoSpecificVmdk, 1),
},
};
*spec_info->u.vmdk.data = (ImageInfoSpecificVmdk) {
.create_type = g_strdup(s->create_type),
.cid = s->cid,
.parent_cid = s->parent_cid,
};
next = &spec_info->u.vmdk.data->extents;
for (i = 0; i < s->num_extents; i++) {
*next = g_new0(ImageInfoList, 1);
(*next)->value = vmdk_get_extent_info(&s->extents[i]);
(*next)->next = NULL;
next = &(*next)->next;
}
return spec_info;
}
static bool vmdk_extents_type_eq(const VmdkExtent *a, const VmdkExtent *b)
{
return a->flat == b->flat &&
a->compressed == b->compressed &&
(a->flat || a->cluster_sectors == b->cluster_sectors);
}
static int vmdk_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
{
int i;
BDRVVmdkState *s = bs->opaque;
assert(s->num_extents);
/* See if we have multiple extents but they have different cases */
for (i = 1; i < s->num_extents; i++) {
if (!vmdk_extents_type_eq(&s->extents[0], &s->extents[i])) {
return -ENOTSUP;
}
}
bdi->needs_compressed_writes = s->extents[0].compressed;
if (!s->extents[0].flat) {
bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS;
}
return 0;
}
static QemuOptsList vmdk_create_opts = {
.name = "vmdk-create-opts",
.head = QTAILQ_HEAD_INITIALIZER(vmdk_create_opts.head),
.desc = {
{
.name = BLOCK_OPT_SIZE,
.type = QEMU_OPT_SIZE,
.help = "Virtual disk size"
},
{
.name = BLOCK_OPT_ADAPTER_TYPE,
.type = QEMU_OPT_STRING,
.help = "Virtual adapter type, can be one of "
"ide (default), lsilogic, buslogic or legacyESX"
},
{
.name = BLOCK_OPT_BACKING_FILE,
.type = QEMU_OPT_STRING,
.help = "File name of a base image"
},
{
.name = BLOCK_OPT_COMPAT6,
.type = QEMU_OPT_BOOL,
.help = "VMDK version 6 image",
.def_value_str = "off"
},
{
.name = BLOCK_OPT_HWVERSION,
.type = QEMU_OPT_STRING,
.help = "VMDK hardware version",
.def_value_str = "undefined"
},
{
.name = BLOCK_OPT_SUBFMT,
.type = QEMU_OPT_STRING,
.help =
"VMDK flat extent format, can be one of "
"{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} "
},
{
.name = BLOCK_OPT_ZEROED_GRAIN,
.type = QEMU_OPT_BOOL,
.help = "Enable efficient zero writes "
"using the zeroed-grain GTE feature"
},
{ /* end of list */ }
}
};
static BlockDriver bdrv_vmdk = {
.format_name = "vmdk",
.instance_size = sizeof(BDRVVmdkState),
.bdrv_probe = vmdk_probe,
.bdrv_open = vmdk_open,
.bdrv_check = vmdk_check,
.bdrv_reopen_prepare = vmdk_reopen_prepare,
.bdrv_co_preadv = vmdk_co_preadv,
.bdrv_co_pwritev = vmdk_co_pwritev,
.bdrv_co_pwritev_compressed = vmdk_co_pwritev_compressed,
.bdrv_co_pwrite_zeroes = vmdk_co_pwrite_zeroes,
.bdrv_close = vmdk_close,
.bdrv_create = vmdk_create,
.bdrv_co_flush_to_disk = vmdk_co_flush,
.bdrv_co_get_block_status = vmdk_co_get_block_status,
.bdrv_get_allocated_file_size = vmdk_get_allocated_file_size,
.bdrv_has_zero_init = vmdk_has_zero_init,
.bdrv_get_specific_info = vmdk_get_specific_info,
.bdrv_refresh_limits = vmdk_refresh_limits,
.bdrv_get_info = vmdk_get_info,
.supports_backing = true,
.create_opts = &vmdk_create_opts,
};
static void bdrv_vmdk_init(void)
{
bdrv_register(&bdrv_vmdk);
}
block_init(bdrv_vmdk_init);
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