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libvirt/src/storage_backend_disk.c
Miloslav Trmač 46acb0f2b7 Add support for encrypted (qcow) volume creation. 
Supports only virStorageVolCreateXML, not virStorageVolCreateXMLFrom.

Curiously, qemu-img does not need the passphrase for anything to create
an encrypted volume.  This implementation thus does not need to touch
any secrets to work with cooperating clients.  More generic passphrase
handling is added in the next patch.

* src/storage_backend.c: Request encryption when creating qcow/qcow2
  files
* src/storage_backend_disk.c, src/storage_backend_fs.c,
  src/storage_backend_logical.c: Refuse to create volumes with
  encryption params set.
2009-09-01 18:27:51 +01:00

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/*
* storage_backend_disk.c: storage backend for disk handling
*
* Copyright (C) 2007-2008 Red Hat, Inc.
* Copyright (C) 2007-2008 Daniel P. Berrange
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Daniel P. Berrange <berrange@redhat.com>
*/
#include <config.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include "virterror_internal.h"
#include "logging.h"
#include "storage_backend_disk.h"
#include "util.h"
#include "memory.h"
#define VIR_FROM_THIS VIR_FROM_STORAGE
#define PARTHELPER BINDIR "/libvirt_parthelper"
#define SECTOR_SIZE 512
static int
virStorageBackendDiskMakeDataVol(virConnectPtr conn,
virStoragePoolObjPtr pool,
char **const groups,
virStorageVolDefPtr vol)
{
char *tmp, *devpath;
if (vol == NULL) {
if (VIR_ALLOC(vol) < 0) {
virReportOOMError(conn);
return -1;
}
if (VIR_REALLOC_N(pool->volumes.objs,
pool->volumes.count+1) < 0) {
virReportOOMError(conn);
virStorageVolDefFree(vol);
return -1;
}
pool->volumes.objs[pool->volumes.count++] = vol;
/* Prepended path will be same for all partitions, so we can
* strip the path to form a reasonable pool-unique name
*/
tmp = strrchr(groups[0], '/');
if ((vol->name = strdup(tmp ? tmp + 1 : groups[0])) == NULL) {
virReportOOMError(conn);
return -1;
}
}
if (vol->target.path == NULL) {
if ((devpath = strdup(groups[0])) == NULL) {
virReportOOMError(conn);
return -1;
}
/* Now figure out the stable path
*
* XXX this method is O(N) because it scans the pool target
* dir every time its run. Should figure out a more efficient
* way of doing this...
*/
if ((vol->target.path = virStorageBackendStablePath(conn,
pool,
devpath)) == NULL)
return -1;
VIR_FREE(devpath);
}
if (vol->key == NULL) {
/* XXX base off a unique key of the underlying disk */
if ((vol->key = strdup(vol->target.path)) == NULL) {
virReportOOMError(conn);
return -1;
}
}
if (vol->source.extents == NULL) {
if (VIR_ALLOC(vol->source.extents) < 0) {
virReportOOMError(conn);
return -1;
}
vol->source.nextent = 1;
if (virStrToLong_ull(groups[3], NULL, 10,
&vol->source.extents[0].start) < 0) {
virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
"%s", _("cannot parse device start location"));
return -1;
}
if (virStrToLong_ull(groups[4], NULL, 10,
&vol->source.extents[0].end) < 0) {
virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
"%s", _("cannot parse device end location"));
return -1;
}
if ((vol->source.extents[0].path =
strdup(pool->def->source.devices[0].path)) == NULL) {
virReportOOMError(conn);
return -1;
}
}
/* Refresh allocation/capacity/perms */
if (virStorageBackendUpdateVolInfo(conn, vol, 1) < 0)
return -1;
/* set partition type */
if(STREQ(groups[1], "normal"))
vol->target.type = VIR_STORAGE_VOL_DISK_TYPE_PRIMARY;
else if(STREQ(groups[1], "logical"))
vol->target.type = VIR_STORAGE_VOL_DISK_TYPE_LOGICAL;
else if(STREQ(groups[1], "extended"))
vol->target.type = VIR_STORAGE_VOL_DISK_TYPE_EXTENDED;
else
vol->target.type = VIR_STORAGE_VOL_DISK_TYPE_NONE;
vol->type = VIR_STORAGE_VOL_BLOCK;
/* The above gets allocation wrong for
* extended partitions, so overwrite it */
vol->allocation = vol->capacity =
(vol->source.extents[0].end - vol->source.extents[0].start);
if (STRNEQ(groups[2], "metadata"))
pool->def->allocation += vol->allocation;
if (vol->source.extents[0].end > pool->def->capacity)
pool->def->capacity = vol->source.extents[0].end;
return 0;
}
static int
virStorageBackendDiskMakeFreeExtent(virConnectPtr conn ATTRIBUTE_UNUSED,
virStoragePoolObjPtr pool,
char **const groups)
{
virStoragePoolSourceDevicePtr dev = &pool->def->source.devices[0];
if (VIR_REALLOC_N(dev->freeExtents,
dev->nfreeExtent + 1) < 0)
return -1;
memset(dev->freeExtents +
dev->nfreeExtent, 0,
sizeof(dev->freeExtents[0]));
/* set type of free area */
if(STREQ(groups[1], "logical")) {
dev->freeExtents[dev->nfreeExtent].type = VIR_STORAGE_FREE_LOGICAL;
} else {
dev->freeExtents[dev->nfreeExtent].type = VIR_STORAGE_FREE_NORMAL;
}
if (virStrToLong_ull(groups[3], NULL, 10,
&dev->freeExtents[dev->nfreeExtent].start) < 0)
return -1; /* Don't bother to re-alloc freeExtents - it'll be free'd shortly */
if (virStrToLong_ull(groups[4], NULL, 10,
&dev->freeExtents[dev->nfreeExtent].end) < 0)
return -1; /* Don't bother to re-alloc freeExtents - it'll be free'd shortly */
/* first block reported as free, even if it is not */
if (dev->freeExtents[dev->nfreeExtent].start == 0) {
dev->freeExtents[dev->nfreeExtent].start = SECTOR_SIZE;
}
pool->def->available +=
(dev->freeExtents[dev->nfreeExtent].end -
dev->freeExtents[dev->nfreeExtent].start);
if (dev->freeExtents[dev->nfreeExtent].end > pool->def->capacity)
pool->def->capacity = dev->freeExtents[dev->nfreeExtent].end;
dev->nfreeExtent++;
return 0;
}
static int
virStorageBackendDiskMakeVol(virConnectPtr conn,
virStoragePoolObjPtr pool,
size_t ntok ATTRIBUTE_UNUSED,
char **const groups,
void *data)
{
/*
* Ignore normal+metadata, and logical+metadata partitions
* since they're basically internal book-keeping regions
* we have no control over. Do keep extended+metadata though
* because that's the MS-DOS extended partition region we
* need to be able to view/create/delete
*/
if ((STREQ(groups[1], "normal") ||
STREQ(groups[1], "logical")) &&
STREQ(groups[2], "metadata"))
return 0;
/* Remaining data / metadata parts get turn into volumes... */
if (STREQ(groups[2], "metadata") ||
STREQ(groups[2], "data")) {
virStorageVolDefPtr vol = data;
if (vol) {
/* We're searching for a specific vol only */
if (vol->key) {
if (STRNEQ(vol->key, groups[0]))
return 0;
} else if (virStorageVolDefFindByKey(pool, groups[0]) != NULL) {
/* If no key, the volume must be newly created. If groups[0]
* isn't already a volume, assume it's the path we want */
return 0;
}
}
return virStorageBackendDiskMakeDataVol(conn, pool, groups, vol);
} else if (STREQ(groups[2], "free")) {
/* ....or free space extents */
return virStorageBackendDiskMakeFreeExtent(conn, pool, groups);
} else {
/* This code path should never happen unless someone changed
* libvirt_parthelper forgot to change this code */
return -1;
}
}
/* To get a list of partitions we run an external helper
* tool which then uses parted APIs. This is because
* parted's API is not compatible with libvirt's license
* but we really really want to use parted because the
* other options all suck :-)
*
* All the other storage backends run an external tool for
* listing volumes so this really isn't too much of a pain,
* and we can even ensure the output is friendly.
*/
static int
virStorageBackendDiskReadPartitions(virConnectPtr conn,
virStoragePoolObjPtr pool,
virStorageVolDefPtr vol)
{
/*
* # libvirt_parthelper DEVICE
* /dev/sda1 normal data 32256 106928128 106896384
* /dev/sda2 normal data 106928640 100027629568 99920701440
* - normal metadata 100027630080 100030242304 2612736
*
*/
const char *prog[] = {
PARTHELPER, pool->def->source.devices[0].path, NULL,
};
pool->def->allocation = pool->def->capacity = pool->def->available = 0;
return virStorageBackendRunProgNul(conn,
pool,
prog,
6,
virStorageBackendDiskMakeVol,
vol);
}
static int
virStorageBackendDiskMakePoolGeometry(virConnectPtr conn ATTRIBUTE_UNUSED,
virStoragePoolObjPtr pool,
size_t ntok ATTRIBUTE_UNUSED,
char **const groups,
void *data ATTRIBUTE_UNUSED)
{
pool->def->source.devices[0].geometry.cyliders = atoi(groups[0]);
pool->def->source.devices[0].geometry.heads = atoi(groups[1]);
pool->def->source.devices[0].geometry.sectors = atoi(groups[2]);
return 0;
}
static int
virStorageBackendDiskReadGeometry(virConnectPtr conn, virStoragePoolObjPtr pool)
{
const char *prog[] = {
PARTHELPER, pool->def->source.devices[0].path, "-g", NULL,
};
return virStorageBackendRunProgNul(conn,
pool,
prog,
3,
virStorageBackendDiskMakePoolGeometry,
NULL);
}
static int
virStorageBackendDiskRefreshPool(virConnectPtr conn,
virStoragePoolObjPtr pool)
{
VIR_FREE(pool->def->source.devices[0].freeExtents);
pool->def->source.devices[0].nfreeExtent = 0;
virStorageBackendWaitForDevices(conn);
if (virStorageBackendDiskReadGeometry(conn, pool) != 0) {
return -1;
}
return virStorageBackendDiskReadPartitions(conn, pool, NULL);
}
/**
* Write a new partition table header
*/
static int
virStorageBackendDiskBuildPool(virConnectPtr conn,
virStoragePoolObjPtr pool,
unsigned int flags ATTRIBUTE_UNUSED)
{
/* eg parted /dev/sda mklabel msdos */
const char *prog[] = {
PARTED,
pool->def->source.devices[0].path,
"mklabel",
"--script",
((pool->def->source.format == VIR_STORAGE_POOL_DISK_DOS) ? "msdos" :
virStoragePoolFormatDiskTypeToString(pool->def->source.format)),
NULL,
};
if (virRun(conn, prog, NULL) < 0)
return -1;
return 0;
}
/**
* Decides what kind of partition type that should be created.
* Important when the partition table is of msdos type
*/
static int
virStorageBackendDiskPartTypeToCreate(virStoragePoolObjPtr pool)
{
if (pool->def->source.format == VIR_STORAGE_POOL_DISK_DOS) {
/* count primary and extended paritions,
can't be more than 3 to create a new primary partition */
int i;
int count = 0;
for (i = 0; i < pool->volumes.count; i++) {
if (pool->volumes.objs[i]->target.type == VIR_STORAGE_VOL_DISK_TYPE_PRIMARY ||
pool->volumes.objs[i]->target.type == VIR_STORAGE_VOL_DISK_TYPE_EXTENDED) {
count++;
}
}
if (count >= 4) {
return VIR_STORAGE_VOL_DISK_TYPE_LOGICAL;
}
}
/* for all other cases, all partitions are primary */
return VIR_STORAGE_VOL_DISK_TYPE_PRIMARY;
}
static int
virStorageBackendDiskPartFormat(virConnectPtr conn, virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
char* partFormat)
{
int i;
if (pool->def->source.format == VIR_STORAGE_POOL_DISK_DOS) {
const char *partedFormat = virStoragePartedFsTypeTypeToString(vol->target.format);
if(partedFormat == NULL) {
virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
"%s", _("Invalid partition type"));
return -1;
}
if (vol->target.format == VIR_STORAGE_VOL_DISK_EXTENDED) {
/* make sure we don't have a extended partition already */
for (i = 0; i < pool->volumes.count; i++) {
if (pool->volumes.objs[i]->target.format == VIR_STORAGE_VOL_DISK_EXTENDED) {
virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
"%s", _("extended partition already exists"));
return -1;
}
}
sprintf(partFormat, "%s", partedFormat);
} else {
/* create primary partition as long as it is possible
and after that check if an extended partition exists
to create logical partitions. */
/* XXX Only support one extended partition */
switch (virStorageBackendDiskPartTypeToCreate(pool)) {
case VIR_STORAGE_VOL_DISK_TYPE_PRIMARY:
sprintf(partFormat, "primary %s", partedFormat);
break;
case VIR_STORAGE_VOL_DISK_TYPE_LOGICAL:
/* make sure we have a extended partition */
for (i = 0; i < pool->volumes.count; i++) {
if (pool->volumes.objs[i]->target.format == VIR_STORAGE_VOL_DISK_EXTENDED) {
sprintf(partFormat, "logical %s", partedFormat);
break;
}
}
if (i == pool->volumes.count) {
virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
"%s", _("no extended partition found and no primary partition available"));
return -1;
}
break;
default:
break;
}
}
} else {
sprintf(partFormat, "primary");
}
return 0;
}
/**
* Aligns a new partition to nearest cylinder boundry
* when haveing a msdos partition table type
* to avoid any problem with all ready existing
* partitions
*/
static int
virStorageBackendDiskPartBoundries(virConnectPtr conn,
virStoragePoolObjPtr pool,
unsigned long long *start,
unsigned long long *end,
unsigned long long allocation)
{
int i;
int smallestExtent = -1;
unsigned long long smallestSize = 0;
unsigned long long extraBytes = 0;
unsigned long long alignedAllocation = allocation;
virStoragePoolSourceDevicePtr dev = &pool->def->source.devices[0];
unsigned long long cylinderSize = dev->geometry.heads *
dev->geometry.sectors * SECTOR_SIZE;
DEBUG("find free area: allocation %llu, cyl size %llu\n", allocation, cylinderSize);
int partType = virStorageBackendDiskPartTypeToCreate(pool);
/* how many extra bytes we have since we allocate
aligned to the cylinder boundry */
extraBytes = cylinderSize - (allocation % cylinderSize);
for (i = 0 ; i < dev->nfreeExtent ; i++) {
unsigned long long size =
dev->freeExtents[i].end -
dev->freeExtents[i].start;
unsigned long long neededSize = allocation;
if (pool->def->source.format == VIR_STORAGE_POOL_DISK_DOS) {
/* align to cylinder boundry */
neededSize += extraBytes;
if ((*start % cylinderSize) > extraBytes) {
/* add an extra cylinder if the offset can't fit within
the extra bytes we have */
neededSize += cylinderSize;
}
/* if we are creating a logical patition, we need one extra
block between partitions (or actually move start one block) */
if (partType == VIR_STORAGE_VOL_DISK_TYPE_LOGICAL) {
size -= SECTOR_SIZE;
}
}
if (size > neededSize &&
(smallestSize == 0 ||
size < smallestSize)) {
/* for logical partition, the free extent
must be within a logical free area */
if (partType == VIR_STORAGE_VOL_DISK_TYPE_LOGICAL &&
dev->freeExtents[i].type != VIR_STORAGE_FREE_LOGICAL) {
continue;
/* for primary partition, the free extent
must not be within a logical free area */
} else if(partType == VIR_STORAGE_VOL_DISK_TYPE_PRIMARY &&
dev->freeExtents[i].type != VIR_STORAGE_FREE_NORMAL) {
continue;
}
smallestSize = size;
smallestExtent = i;
alignedAllocation = neededSize;
}
}
if (smallestExtent == -1) {
virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
"%s", _("no large enough free extent"));
return -1;
}
DEBUG("aligned alloc %llu\n", alignedAllocation);
*start = dev->freeExtents[smallestExtent].start;
if (partType == VIR_STORAGE_VOL_DISK_TYPE_LOGICAL) {
/* for logical partition, skip one block */
*start += SECTOR_SIZE;
}
*end = *start + alignedAllocation;
if (pool->def->source.format == VIR_STORAGE_POOL_DISK_DOS) {
/* adjust our allocation if start is not at a cylinder boundry */
*end -= (*start % cylinderSize);
}
/* counting in byte, we want the last byte of the current sector */
*end -= 1;
DEBUG("final aligned start %llu, end %llu\n", *start, *end);
return 0;
}
static int
virStorageBackendDiskCreateVol(virConnectPtr conn,
virStoragePoolObjPtr pool,
virStorageVolDefPtr vol)
{
char start[100], end[100], partFormat[100];
unsigned long long startOffset = 0, endOffset = 0;
const char *cmdargv[] = {
PARTED,
pool->def->source.devices[0].path,
"mkpart",
"--script",
partFormat,
start,
end,
NULL
};
if (vol->target.encryption != NULL) {
virStorageReportError(conn, VIR_ERR_NO_SUPPORT,
"%s", _("storage pool does not support encrypted "
"volumes"));
return -1;
}
if (virStorageBackendDiskPartFormat(conn, pool, vol, partFormat) != 0) {
return -1;
}
if (virStorageBackendDiskPartBoundries(conn, pool, &startOffset,
&endOffset,
vol->capacity) != 0) {
return -1;
}
snprintf(start, sizeof(start)-1, "%lluB", startOffset);
start[sizeof(start)-1] = '\0';
snprintf(end, sizeof(end)-1, "%lluB", endOffset);
end[sizeof(end)-1] = '\0';
if (virRun(conn, cmdargv, NULL) < 0)
return -1;
/* wait for device node to show up */
virStorageBackendWaitForDevices(conn);
/* Blow away free extent info, as we're about to re-populate it */
VIR_FREE(pool->def->source.devices[0].freeExtents);
pool->def->source.devices[0].nfreeExtent = 0;
/* Specifying a target path is meaningless */
VIR_FREE(vol->target.path);
/* Fetch actual extent info, generate key */
if (virStorageBackendDiskReadPartitions(conn, pool, vol) < 0)
return -1;
return 0;
}
static int
virStorageBackendDiskBuildVolFrom(virConnectPtr conn,
virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
unsigned int flags)
{
virStorageBackendBuildVolFrom build_func;
build_func = virStorageBackendGetBuildVolFromFunction(conn, vol, inputvol);
if (!build_func)
return -1;
return build_func(conn, vol, inputvol, flags);
}
static int
virStorageBackendDiskDeleteVol(virConnectPtr conn,
virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
unsigned int flags ATTRIBUTE_UNUSED)
{
char *part_num = NULL;
int err;
char *devpath = NULL;
char *devname, *srcname;
int rc = -1;
if ((err = virFileResolveLink(vol->target.path, &devpath)) < 0) {
virReportSystemError(conn, err,
_("Couldn't read volume target path '%s'"),
vol->target.path);
goto cleanup;
}
devname = basename(devpath);
srcname = basename(pool->def->source.devices[0].path);
DEBUG("devname=%s, srcname=%s", devname, srcname);
if (!STRPREFIX(devname, srcname)) {
virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
_("Volume path '%s' did not start with parent "
"pool source device name."), devname);
goto cleanup;
}
part_num = devname + strlen(srcname);
if (!part_num) {
virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
_("cannot parse partition number from target "
"'%s'"), devname);
goto cleanup;
}
/* eg parted /dev/sda rm 2 */
const char *prog[] = {
PARTED,
pool->def->source.devices[0].path,
"rm",
"--script",
part_num,
NULL,
};
if (virRun(conn, prog, NULL) < 0)
goto cleanup;
rc = 0;
cleanup:
VIR_FREE(devpath);
return rc;
}
virStorageBackend virStorageBackendDisk = {
.type = VIR_STORAGE_POOL_DISK,
.buildPool = virStorageBackendDiskBuildPool,
.refreshPool = virStorageBackendDiskRefreshPool,
.createVol = virStorageBackendDiskCreateVol,
.deleteVol = virStorageBackendDiskDeleteVol,
.buildVolFrom = virStorageBackendDiskBuildVolFrom,
};
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