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libvirt/src/storage/storage_backend.c
Martin Kletzander 068fde5fcf storage: Clean up volume wiping 
Let's cleanly differentiate what wiping a volume does for ploop and
other volumes so it's more readable what is done for each one instead of
branching out multiple times in different parts of the same function.

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
2016-08-02 13:21:01 +02:00

2669 lines
82 KiB
C
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/*
* storage_backend.c: internal storage driver backend contract
*
* Copyright (C) 2007-2016 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, see
* <http://www.gnu.org/licenses/>.
*
* Author: Daniel P. Berrange <berrange@redhat.com>
*/
#include <config.h>
#include <string.h>
#include <stdio.h>
#include <regex.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <dirent.h>
#include "dirname.h"
#ifdef __linux__
# include <sys/ioctl.h>
# include <linux/fs.h>
# ifndef FS_NOCOW_FL
# define FS_NOCOW_FL 0x00800000 /* Do not cow file */
# endif
#endif
#if WITH_SELINUX
# include <selinux/selinux.h>
#endif
#if HAVE_LINUX_BTRFS_H
# include <linux/btrfs.h>
#endif
#include "datatypes.h"
#include "virerror.h"
#include "viralloc.h"
#include "internal.h"
#include "secret_conf.h"
#include "secret_util.h"
#include "vircrypto.h"
#include "viruuid.h"
#include "virstoragefile.h"
#include "storage_backend.h"
#include "virlog.h"
#include "virfile.h"
#include "virjson.h"
#include "virqemu.h"
#include "stat-time.h"
#include "virstring.h"
#include "virxml.h"
#include "fdstream.h"
#if WITH_STORAGE_LVM
# include "storage_backend_logical.h"
#endif
#if WITH_STORAGE_ISCSI
# include "storage_backend_iscsi.h"
#endif
#if WITH_STORAGE_SCSI
# include "storage_backend_scsi.h"
#endif
#if WITH_STORAGE_MPATH
# include "storage_backend_mpath.h"
#endif
#if WITH_STORAGE_DISK
# include "storage_backend_disk.h"
#endif
#if WITH_STORAGE_DIR
# include "storage_backend_fs.h"
#endif
#if WITH_STORAGE_RBD
# include "storage_backend_rbd.h"
#endif
#if WITH_STORAGE_SHEEPDOG
# include "storage_backend_sheepdog.h"
#endif
#if WITH_STORAGE_GLUSTER
# include "storage_backend_gluster.h"
#endif
#if WITH_STORAGE_ZFS
# include "storage_backend_zfs.h"
#endif
#define VIR_FROM_THIS VIR_FROM_STORAGE
VIR_LOG_INIT("storage.storage_backend");
static virStorageBackendPtr backends[] = {
#if WITH_STORAGE_DIR
&virStorageBackendDirectory,
#endif
#if WITH_STORAGE_FS
&virStorageBackendFileSystem,
&virStorageBackendNetFileSystem,
#endif
#if WITH_STORAGE_LVM
&virStorageBackendLogical,
#endif
#if WITH_STORAGE_ISCSI
&virStorageBackendISCSI,
#endif
#if WITH_STORAGE_SCSI
&virStorageBackendSCSI,
#endif
#if WITH_STORAGE_MPATH
&virStorageBackendMpath,
#endif
#if WITH_STORAGE_DISK
&virStorageBackendDisk,
#endif
#if WITH_STORAGE_RBD
&virStorageBackendRBD,
#endif
#if WITH_STORAGE_SHEEPDOG
&virStorageBackendSheepdog,
#endif
#if WITH_STORAGE_GLUSTER
&virStorageBackendGluster,
#endif
#if WITH_STORAGE_ZFS
&virStorageBackendZFS,
#endif
NULL
};
static virStorageFileBackendPtr fileBackends[] = {
#if WITH_STORAGE_FS
&virStorageFileBackendFile,
&virStorageFileBackendBlock,
#endif
#if WITH_STORAGE_GLUSTER
&virStorageFileBackendGluster,
#endif
NULL
};
#define READ_BLOCK_SIZE_DEFAULT (1024 * 1024)
#define WRITE_BLOCK_SIZE_DEFAULT (4 * 1024)
/*
* Perform the O(1) btrfs clone operation, if possible.
* Upon success, return 0. Otherwise, return -1 and set errno.
*/
#if HAVE_LINUX_BTRFS_H
static inline int
btrfsCloneFile(int dest_fd, int src_fd)
{
return ioctl(dest_fd, BTRFS_IOC_CLONE, src_fd);
}
#else
static inline int
btrfsCloneFile(int dest_fd ATTRIBUTE_UNUSED,
int src_fd ATTRIBUTE_UNUSED)
{
errno = ENOTSUP;
return -1;
}
#endif
static int ATTRIBUTE_NONNULL(2)
virStorageBackendCopyToFD(virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
int fd,
unsigned long long *total,
bool want_sparse,
bool reflink_copy)
{
int inputfd = -1;
int amtread = -1;
int ret = 0;
size_t rbytes = READ_BLOCK_SIZE_DEFAULT;
int wbytes = 0;
int interval;
char *zerobuf = NULL;
char *buf = NULL;
struct stat st;
if ((inputfd = open(inputvol->target.path, O_RDONLY)) < 0) {
ret = -errno;
virReportSystemError(errno,
_("could not open input path '%s'"),
inputvol->target.path);
goto cleanup;
}
#ifdef __linux__
if (ioctl(fd, BLKBSZGET, &wbytes) < 0)
wbytes = 0;
#endif
if ((wbytes == 0) && fstat(fd, &st) == 0)
wbytes = st.st_blksize;
if (wbytes < WRITE_BLOCK_SIZE_DEFAULT)
wbytes = WRITE_BLOCK_SIZE_DEFAULT;
if (VIR_ALLOC_N(zerobuf, wbytes) < 0) {
ret = -errno;
goto cleanup;
}
if (VIR_ALLOC_N(buf, rbytes) < 0) {
ret = -errno;
goto cleanup;
}
if (reflink_copy) {
if (btrfsCloneFile(fd, inputfd) < 0) {
ret = -errno;
virReportSystemError(errno,
_("failed to clone files from '%s'"),
inputvol->target.path);
goto cleanup;
} else {
VIR_DEBUG("btrfs clone finished.");
goto cleanup;
}
}
while (amtread != 0) {
int amtleft;
if (*total < rbytes)
rbytes = *total;
if ((amtread = saferead(inputfd, buf, rbytes)) < 0) {
ret = -errno;
virReportSystemError(errno,
_("failed reading from file '%s'"),
inputvol->target.path);
goto cleanup;
}
*total -= amtread;
/* Loop over amt read in 512 byte increments, looking for sparse
* blocks */
amtleft = amtread;
do {
interval = ((wbytes > amtleft) ? amtleft : wbytes);
int offset = amtread - amtleft;
if (want_sparse && memcmp(buf+offset, zerobuf, interval) == 0) {
if (lseek(fd, interval, SEEK_CUR) < 0) {
ret = -errno;
virReportSystemError(errno,
_("cannot extend file '%s'"),
vol->target.path);
goto cleanup;
}
} else if (safewrite(fd, buf+offset, interval) < 0) {
ret = -errno;
virReportSystemError(errno,
_("failed writing to file '%s'"),
vol->target.path);
goto cleanup;
}
} while ((amtleft -= interval) > 0);
}
if (fdatasync(fd) < 0) {
ret = -errno;
virReportSystemError(errno, _("cannot sync data to file '%s'"),
vol->target.path);
goto cleanup;
}
if (VIR_CLOSE(inputfd) < 0) {
ret = -errno;
virReportSystemError(errno,
_("cannot close file '%s'"),
inputvol->target.path);
goto cleanup;
}
inputfd = -1;
cleanup:
VIR_FORCE_CLOSE(inputfd);
VIR_FREE(zerobuf);
VIR_FREE(buf);
return ret;
}
static int
virStorageBackendCreateBlockFrom(virConnectPtr conn ATTRIBUTE_UNUSED,
virStoragePoolObjPtr pool ATTRIBUTE_UNUSED,
virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
unsigned int flags)
{
int fd = -1;
int ret = -1;
unsigned long long remain;
struct stat st;
gid_t gid;
uid_t uid;
mode_t mode;
bool reflink_copy = false;
virCheckFlags(VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA |
VIR_STORAGE_VOL_CREATE_REFLINK,
-1);
if (flags & VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("metadata preallocation is not supported for block "
"volumes"));
goto cleanup;
}
if (flags & VIR_STORAGE_VOL_CREATE_REFLINK)
reflink_copy = true;
if ((fd = open(vol->target.path, O_RDWR)) < 0) {
virReportSystemError(errno,
_("cannot create path '%s'"),
vol->target.path);
goto cleanup;
}
remain = vol->target.capacity;
if (inputvol) {
if (virStorageBackendCopyToFD(vol, inputvol, fd, &remain,
false, reflink_copy) < 0)
goto cleanup;
}
if (fstat(fd, &st) == -1) {
virReportSystemError(errno, _("stat of '%s' failed"),
vol->target.path);
goto cleanup;
}
uid = (vol->target.perms->uid != st.st_uid) ? vol->target.perms->uid
: (uid_t) -1;
gid = (vol->target.perms->gid != st.st_gid) ? vol->target.perms->gid
: (gid_t) -1;
if (((uid != (uid_t) -1) || (gid != (gid_t) -1))
&& (fchown(fd, uid, gid) < 0)) {
virReportSystemError(errno,
_("cannot chown '%s' to (%u, %u)"),
vol->target.path, (unsigned int) uid,
(unsigned int) gid);
goto cleanup;
}
mode = (vol->target.perms->mode == (mode_t) -1 ?
VIR_STORAGE_DEFAULT_VOL_PERM_MODE : vol->target.perms->mode);
if (fchmod(fd, mode) < 0) {
virReportSystemError(errno,
_("cannot set mode of '%s' to %04o"),
vol->target.path, mode);
goto cleanup;
}
if (VIR_CLOSE(fd) < 0) {
virReportSystemError(errno,
_("cannot close file '%s'"),
vol->target.path);
goto cleanup;
}
fd = -1;
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
static int
createRawFile(int fd, virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
bool reflink_copy)
{
bool need_alloc = true;
int ret = 0;
unsigned long long pos = 0;
/* If the new allocation is lower than the capacity of the original file,
* the cloned volume will be sparse */
if (inputvol &&
vol->target.allocation < inputvol->target.capacity)
need_alloc = false;
/* Seek to the final size, so the capacity is available upfront
* for progress reporting */
if (ftruncate(fd, vol->target.capacity) < 0) {
ret = -errno;
virReportSystemError(errno,
_("cannot extend file '%s'"),
vol->target.path);
goto cleanup;
}
/* Avoid issues with older kernel's <linux/fs.h> namespace pollution. */
#if HAVE_FALLOCATE - 0
/* Try to preallocate all requested disk space, but fall back to
* other methods if this fails with ENOSYS or EOPNOTSUPP. If allocation
* is 0 (or less than 0), then fallocate will fail with EINVAL.
* NOTE: do not use posix_fallocate; posix_fallocate falls back
* to writing zeroes block by block in case fallocate isn't
* available, and since we're going to copy data from another
* file it doesn't make sense to write the file twice. */
if (vol->target.allocation && need_alloc) {
if (fallocate(fd, 0, 0, vol->target.allocation) == 0) {
need_alloc = false;
} else if (errno != ENOSYS && errno != EOPNOTSUPP) {
ret = -errno;
virReportSystemError(errno,
_("cannot allocate %llu bytes in file '%s'"),
vol->target.allocation, vol->target.path);
goto cleanup;
}
}
#endif
if (inputvol) {
unsigned long long remain = inputvol->target.capacity;
/* allow zero blocks to be skipped if we've requested sparse
* allocation (allocation < capacity) or we have already
* been able to allocate the required space. */
if ((ret = virStorageBackendCopyToFD(vol, inputvol, fd, &remain,
!need_alloc, reflink_copy)) < 0)
goto cleanup;
/* If the new allocation is greater than the original capacity,
* but fallocate failed, fill the rest with zeroes.
*/
pos = inputvol->target.capacity - remain;
}
if (need_alloc && (vol->target.allocation - pos > 0)) {
if (safezero(fd, pos, vol->target.allocation - pos) < 0) {
ret = -errno;
virReportSystemError(errno, _("cannot fill file '%s'"),
vol->target.path);
goto cleanup;
}
}
if (fsync(fd) < 0) {
ret = -errno;
virReportSystemError(errno, _("cannot sync data to file '%s'"),
vol->target.path);
goto cleanup;
}
cleanup:
return ret;
}
int
virStorageBackendCreateRaw(virConnectPtr conn ATTRIBUTE_UNUSED,
virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
unsigned int flags)
{
int ret = -1;
int fd = -1;
int operation_flags;
bool reflink_copy = false;
mode_t open_mode = VIR_STORAGE_DEFAULT_VOL_PERM_MODE;
bool created = false;
virCheckFlags(VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA |
VIR_STORAGE_VOL_CREATE_REFLINK,
-1);
if (flags & VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("metadata preallocation is not supported for raw "
"volumes"));
goto cleanup;
}
if (vol->target.backingStore) {
virReportError(VIR_ERR_NO_SUPPORT, "%s",
_("backing storage not supported for raw volumes"));
goto cleanup;
}
if (flags & VIR_STORAGE_VOL_CREATE_REFLINK)
reflink_copy = true;
if (vol->target.encryption != NULL) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("storage pool does not support encrypted volumes"));
goto cleanup;
}
operation_flags = VIR_FILE_OPEN_FORCE_MODE | VIR_FILE_OPEN_FORCE_OWNER;
if (pool->def->type == VIR_STORAGE_POOL_NETFS)
operation_flags |= VIR_FILE_OPEN_FORK;
if (vol->target.perms->mode != (mode_t) -1)
open_mode = vol->target.perms->mode;
if ((fd = virFileOpenAs(vol->target.path,
O_RDWR | O_CREAT | O_EXCL,
open_mode,
vol->target.perms->uid,
vol->target.perms->gid,
operation_flags)) < 0) {
virReportSystemError(-fd,
_("Failed to create file '%s'"),
vol->target.path);
goto cleanup;
}
created = true;
if (vol->target.nocow) {
#ifdef __linux__
int attr;
/* Set NOCOW flag. This is an optimisation for btrfs.
* The FS_IOC_SETFLAGS ioctl return value will be ignored since any
* failure of this operation should not block the volume creation.
*/
if (ioctl(fd, FS_IOC_GETFLAGS, &attr) < 0) {
virReportSystemError(errno, "%s", _("Failed to get fs flags"));
} else {
attr |= FS_NOCOW_FL;
if (ioctl(fd, FS_IOC_SETFLAGS, &attr) < 0) {
virReportSystemError(errno, "%s",
_("Failed to set NOCOW flag"));
}
}
#endif
}
if ((ret = createRawFile(fd, vol, inputvol, reflink_copy)) < 0)
/* createRawFile already reported the exact error. */
ret = -1;
cleanup:
if (ret < 0 && created)
ignore_value(virFileRemove(vol->target.path,
vol->target.perms->uid,
vol->target.perms->gid));
VIR_FORCE_CLOSE(fd);
return ret;
}
static int
virStorageGenerateSecretUUID(virConnectPtr conn,
unsigned char *uuid)
{
unsigned attempt;
for (attempt = 0; attempt < 65536; attempt++) {
virSecretPtr tmp;
if (virUUIDGenerate(uuid) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("unable to generate uuid"));
return -1;
}
tmp = conn->secretDriver->secretLookupByUUID(conn, uuid);
if (tmp == NULL)
return 0;
virObjectUnref(tmp);
}
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("too many conflicts when generating a uuid"));
return -1;
}
static int
virStorageGenerateQcowEncryption(virConnectPtr conn,
virStorageVolDefPtr vol)
{
virSecretDefPtr def = NULL;
virBuffer buf = VIR_BUFFER_INITIALIZER;
virStorageEncryptionPtr enc;
virStorageEncryptionSecretPtr enc_secret = NULL;
virSecretPtr secret = NULL;
char *xml;
unsigned char value[VIR_STORAGE_QCOW_PASSPHRASE_SIZE];
int ret = -1;
if (conn->secretDriver == NULL ||
conn->secretDriver->secretLookupByUUID == NULL ||
conn->secretDriver->secretDefineXML == NULL ||
conn->secretDriver->secretSetValue == NULL) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("secret storage not supported"));
goto cleanup;
}
enc = vol->target.encryption;
if (enc->nsecrets != 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("secrets already defined"));
goto cleanup;
}
if (VIR_ALLOC(enc_secret) < 0 || VIR_REALLOC_N(enc->secrets, 1) < 0 ||
VIR_ALLOC(def) < 0)
goto cleanup;
def->isephemeral = false;
def->isprivate = false;
if (virStorageGenerateSecretUUID(conn, def->uuid) < 0)
goto cleanup;
def->usage_type = VIR_SECRET_USAGE_TYPE_VOLUME;
if (VIR_STRDUP(def->usage.volume, vol->target.path) < 0)
goto cleanup;
xml = virSecretDefFormat(def);
virSecretDefFree(def);
def = NULL;
if (xml == NULL)
goto cleanup;
secret = conn->secretDriver->secretDefineXML(conn, xml, 0);
if (secret == NULL) {
VIR_FREE(xml);
goto cleanup;
}
VIR_FREE(xml);
if (virStorageGenerateQcowPassphrase(value) < 0)
goto cleanup;
if (conn->secretDriver->secretSetValue(secret, value, sizeof(value), 0) < 0)
goto cleanup;
enc_secret->type = VIR_STORAGE_ENCRYPTION_SECRET_TYPE_PASSPHRASE;
enc_secret->seclookupdef.type = VIR_SECRET_LOOKUP_TYPE_UUID;
memcpy(enc_secret->seclookupdef.u.uuid, secret->uuid, VIR_UUID_BUFLEN);
enc->format = VIR_STORAGE_ENCRYPTION_FORMAT_QCOW;
enc->secrets[0] = enc_secret; /* Space for secrets[0] allocated above */
enc_secret = NULL;
enc->nsecrets = 1;
ret = 0;
cleanup:
if (secret != NULL) {
if (ret != 0 &&
conn->secretDriver->secretUndefine != NULL)
conn->secretDriver->secretUndefine(secret);
virObjectUnref(secret);
}
virBufferFreeAndReset(&buf);
virSecretDefFree(def);
VIR_FREE(enc_secret);
return ret;
}
static int
virStorageBackendCreateExecCommand(virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
virCommandPtr cmd)
{
struct stat st;
gid_t gid;
uid_t uid;
mode_t mode = (vol->target.perms->mode == (mode_t) -1 ?
VIR_STORAGE_DEFAULT_VOL_PERM_MODE :
vol->target.perms->mode);
bool filecreated = false;
int ret = -1;
if ((pool->def->type == VIR_STORAGE_POOL_NETFS)
&& (((geteuid() == 0)
&& (vol->target.perms->uid != (uid_t) -1)
&& (vol->target.perms->uid != 0))
|| ((vol->target.perms->gid != (gid_t) -1)
&& (vol->target.perms->gid != getegid())))) {
virCommandSetUID(cmd, vol->target.perms->uid);
virCommandSetGID(cmd, vol->target.perms->gid);
virCommandSetUmask(cmd, S_IRWXUGO ^ mode);
if (virCommandRun(cmd, NULL) == 0) {
/* command was successfully run, check if the file was created */
if (stat(vol->target.path, &st) >= 0) {
filecreated = true;
/* seems qemu-img disregards umask and open/creates using 0644.
* If that doesn't match what we expect, then let's try to
* re-open the file and attempt to force the mode change.
*/
if (mode != (st.st_mode & S_IRWXUGO)) {
int fd = -1;
int flags = VIR_FILE_OPEN_FORK | VIR_FILE_OPEN_FORCE_MODE;
if ((fd = virFileOpenAs(vol->target.path, O_RDWR, mode,
vol->target.perms->uid,
vol->target.perms->gid,
flags)) >= 0) {
/* Success - means we're good */
VIR_FORCE_CLOSE(fd);
ret = 0;
goto cleanup;
}
}
}
}
}
if (!filecreated) {
/* don't change uid/gid/mode if we retry */
virCommandSetUID(cmd, -1);
virCommandSetGID(cmd, -1);
virCommandSetUmask(cmd, 0);
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
if (stat(vol->target.path, &st) < 0) {
virReportSystemError(errno,
_("failed to create %s"), vol->target.path);
goto cleanup;
}
filecreated = true;
}
uid = (vol->target.perms->uid != st.st_uid) ? vol->target.perms->uid
: (uid_t) -1;
gid = (vol->target.perms->gid != st.st_gid) ? vol->target.perms->gid
: (gid_t) -1;
if (((uid != (uid_t) -1) || (gid != (gid_t) -1))
&& (chown(vol->target.path, uid, gid) < 0)) {
virReportSystemError(errno,
_("cannot chown %s to (%u, %u)"),
vol->target.path, (unsigned int) uid,
(unsigned int) gid);
goto cleanup;
}
if (mode != (st.st_mode & S_IRWXUGO) &&
chmod(vol->target.path, mode) < 0) {
virReportSystemError(errno,
_("cannot set mode of '%s' to %04o"),
vol->target.path, mode);
goto cleanup;
}
ret = 0;
cleanup:
if (ret < 0 && filecreated)
virFileRemove(vol->target.path, vol->target.perms->uid,
vol->target.perms->gid);
return ret;
}
/* Create ploop directory with ploop image and DiskDescriptor.xml
* if function fails to create image file the directory will be deleted.*/
int
virStorageBackendCreatePloop(virConnectPtr conn ATTRIBUTE_UNUSED,
virStoragePoolObjPtr pool ATTRIBUTE_UNUSED,
virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
unsigned int flags)
{
int ret = -1;
virCommandPtr cmd = NULL;
char *create_tool = NULL;
bool created = false;
virCheckFlags(0, -1);
if (inputvol && inputvol->target.format != VIR_STORAGE_FILE_PLOOP) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("unsupported input storage vol type %d"),
inputvol->target.format);
return -1;
}
if (vol->target.encryption != NULL) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("encrypted ploop volumes are not supported with "
"ploop init"));
return -1;
}
if (vol->target.backingStore != NULL) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("copy-on-write ploop volumes are not yet supported"));
return -1;
}
create_tool = virFindFileInPath("ploop");
if (!create_tool && !inputvol) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("unable to find ploop, please install "
"ploop tools"));
return -1;
}
if (!inputvol) {
if ((virDirCreate(vol->target.path,
(vol->target.perms->mode == (mode_t) -1 ?
VIR_STORAGE_DEFAULT_VOL_PERM_MODE:
vol->target.perms->mode),
vol->target.perms->uid,
vol->target.perms->gid,
0)) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("error creating directory for ploop volume"));
goto cleanup;
}
cmd = virCommandNewArgList(create_tool, "init", "-s", NULL);
virCommandAddArgFormat(cmd, "%lluM", VIR_DIV_UP(vol->target.capacity,
(1024 * 1024)));
virCommandAddArgList(cmd, "-t", "ext4", NULL);
virCommandAddArgFormat(cmd, "%s/root.hds", vol->target.path);
} else {
vol->target.capacity = inputvol->target.capacity;
cmd = virCommandNewArgList("cp", "-r", inputvol->target.path,
vol->target.path, NULL);
}
created = true;
ret = virCommandRun(cmd, NULL);
cleanup:
virCommandFree(cmd);
VIR_FREE(create_tool);
if (ret < 0 && created)
virFileDeleteTree(vol->target.path);
return ret;
}
int
virStoragePloopResize(virStorageVolDefPtr vol,
unsigned long long capacity)
{
int ret = -1;
virCommandPtr cmd = NULL;
char *resize_tool = NULL;
resize_tool = virFindFileInPath("ploop");
if (!resize_tool) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("unable to find ploop, please install ploop tools"));
return -1;
}
cmd = virCommandNewArgList(resize_tool, "resize", "-s", NULL);
virCommandAddArgFormat(cmd, "%lluM", VIR_DIV_UP(capacity, (1024 * 1024)));
virCommandAddArgFormat(cmd, "%s/DiskDescriptor.xml", vol->target.path);
ret = virCommandRun(cmd, NULL);
virCommandFree(cmd);
VIR_FREE(resize_tool);
return ret;
}
/* Flag values shared w/ storagevolxml2argvtest.c.
*
* QEMU_IMG_BACKING_FORMAT_OPTIONS (added in qemu 0.11)
* QEMU_IMG_BACKING_FORMAT_OPTIONS_COMPAT
* was made necessary due to 2.0 change to change the default
* qcow2 file format from 0.10 to 1.1.
*/
enum {
QEMU_IMG_BACKING_FORMAT_OPTIONS = 0,
QEMU_IMG_BACKING_FORMAT_OPTIONS_COMPAT,
};
static bool
virStorageBackendQemuImgSupportsCompat(const char *qemuimg)
{
bool ret = false;
char *output;
virCommandPtr cmd = NULL;
cmd = virCommandNewArgList(qemuimg, "create", "-o", "?", "-f", "qcow2",
"/dev/null", NULL);
virCommandAddEnvString(cmd, "LC_ALL=C");
virCommandSetOutputBuffer(cmd, &output);
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
if (strstr(output, "\ncompat "))
ret = true;
cleanup:
virCommandFree(cmd);
VIR_FREE(output);
return ret;
}
static int
virStorageBackendQEMUImgBackingFormat(const char *qemuimg)
{
/* As of QEMU 0.11 the [-o options] support was added via qemu
* commit id '9ea2ea71', so we start with that base and figure
* out what else we have */
int ret = QEMU_IMG_BACKING_FORMAT_OPTIONS;
/* QEMU 2.0 changed to using a format that only QEMU 1.1 and newer
* understands. Since we still support QEMU 0.12 and newer, we need
* to be able to handle the previous format as can be set via a
* compat=0.10 option. */
if (virStorageBackendQemuImgSupportsCompat(qemuimg))
ret = QEMU_IMG_BACKING_FORMAT_OPTIONS_COMPAT;
return ret;
}
/* The _virStorageBackendQemuImgInfo separates the command line building from
* the volume definition so that qemuDomainSnapshotCreateInactiveExternal can
* use it without needing to deal with a volume.
*/
struct _virStorageBackendQemuImgInfo {
int format;
const char *path;
unsigned long long size_arg;
bool encryption;
bool preallocate;
const char *compat;
virBitmapPtr features;
bool nocow;
const char *backingPath;
int backingFormat;
const char *inputPath;
const char *inputFormatStr;
int inputFormat;
char *secretAlias;
const char *secretPath;
};
static int
virStorageBackendCreateQemuImgOpts(virStorageEncryptionInfoDefPtr enc,
char **opts,
struct _virStorageBackendQemuImgInfo info)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
if (info.format == VIR_STORAGE_FILE_RAW && enc) {
virQEMUBuildLuksOpts(&buf, enc, info.secretAlias);
} else {
if (info.backingPath)
virBufferAsprintf(&buf, "backing_fmt=%s,",
virStorageFileFormatTypeToString(info.backingFormat));
if (info.encryption)
virBufferAddLit(&buf, "encryption=on,");
if (info.preallocate)
virBufferAddLit(&buf, "preallocation=metadata,");
}
if (info.nocow)
virBufferAddLit(&buf, "nocow=on,");
if (info.compat)
virBufferAsprintf(&buf, "compat=%s,", info.compat);
if (info.features && info.format == VIR_STORAGE_FILE_QCOW2) {
if (virBitmapIsBitSet(info.features,
VIR_STORAGE_FILE_FEATURE_LAZY_REFCOUNTS)) {
if (STREQ_NULLABLE(info.compat, "0.10")) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("lazy_refcounts not supported with compat"
" level %s"),
info.compat);
goto error;
}
virBufferAddLit(&buf, "lazy_refcounts,");
}
}
virBufferTrim(&buf, ",", -1);
if (virBufferCheckError(&buf) < 0)
goto error;
*opts = virBufferContentAndReset(&buf);
return 0;
error:
virBufferFreeAndReset(&buf);
return -1;
}
/* virStorageBackendCreateQemuImgCheckEncryption:
* @format: format of file found
* @conn: pointer to connection
* @vol: pointer to volume def
*
* Ensure the proper setup for encryption.
*
* Returns 0 on success, -1 on failure w/ error set
*/
static int
virStorageBackendCreateQemuImgCheckEncryption(int format,
const char *type,
virConnectPtr conn,
virStorageVolDefPtr vol)
{
virStorageEncryptionPtr enc = vol->target.encryption;
if (format == VIR_STORAGE_FILE_QCOW || format == VIR_STORAGE_FILE_QCOW2) {
if (enc->format != VIR_STORAGE_ENCRYPTION_FORMAT_QCOW &&
enc->format != VIR_STORAGE_ENCRYPTION_FORMAT_DEFAULT) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("unsupported volume encryption format %d"),
vol->target.encryption->format);
return -1;
}
if (enc->nsecrets > 1) {
virReportError(VIR_ERR_XML_ERROR, "%s",
_("too many secrets for qcow encryption"));
return -1;
}
if (enc->format == VIR_STORAGE_ENCRYPTION_FORMAT_DEFAULT ||
enc->nsecrets == 0) {
if (virStorageGenerateQcowEncryption(conn, vol) < 0)
return -1;
}
} else if (format == VIR_STORAGE_FILE_RAW) {
if (enc->format != VIR_STORAGE_ENCRYPTION_FORMAT_LUKS) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("unsupported volume encryption format %d"),
vol->target.encryption->format);
return -1;
}
if (enc->nsecrets > 1) {
virReportError(VIR_ERR_XML_ERROR, "%s",
_("too many secrets for luks encryption"));
return -1;
}
if (enc->nsecrets == 0) {
virReportError(VIR_ERR_XML_ERROR, "%s",
_("no secret provided for luks encryption"));
return -1;
}
if (!virCryptoHaveCipher(VIR_CRYPTO_CIPHER_AES256CBC)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("luks encryption usage requires encrypted "
"secret generation to be supported"));
return -1;
}
} else {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("volume encryption unsupported with format %s"), type);
return -1;
}
return 0;
}
static int
virStorageBackendCreateQemuImgSetInput(virStorageVolDefPtr inputvol,
struct _virStorageBackendQemuImgInfo *info)
{
if (!(info->inputPath = inputvol->target.path)) {
virReportError(VIR_ERR_INVALID_ARG, "%s",
_("missing input volume target path"));
return -1;
}
info->inputFormat = inputvol->target.format;
if (inputvol->type == VIR_STORAGE_VOL_BLOCK)
info->inputFormat = VIR_STORAGE_FILE_RAW;
if (!(info->inputFormatStr =
virStorageFileFormatTypeToString(info->inputFormat))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("unknown storage vol type %d"),
info->inputFormat);
return -1;
}
return 0;
}
static int
virStorageBackendCreateQemuImgSetBacking(virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
struct _virStorageBackendQemuImgInfo *info)
{
int accessRetCode = -1;
char *absolutePath = NULL;
if (info->format == VIR_STORAGE_FILE_RAW) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("cannot set backing store for raw volume"));
return -1;
}
info->backingFormat = vol->target.backingStore->format;
info->backingPath = vol->target.backingStore->path;
if (info->preallocate) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("metadata preallocation conflicts with backing"
" store"));
return -1;
}
/* XXX: Not strictly required: qemu-img has an option a different
* backing store, not really sure what use it serves though, and it
* may cause issues with lvm. Untested essentially.
*/
if (inputvol && inputvol->target.backingStore &&
STRNEQ_NULLABLE(inputvol->target.backingStore->path,
info->backingPath)) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("a different backing store cannot be specified."));
return -1;
}
if (!virStorageFileFormatTypeToString(info->backingFormat)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("unknown storage vol backing store type %d"),
info->backingFormat);
return -1;
}
/* Convert relative backing store paths to absolute paths for access
* validation.
*/
if ('/' != *(info->backingPath) &&
virAsprintf(&absolutePath, "%s/%s", pool->def->target.path,
info->backingPath) < 0)
return -1;
accessRetCode = access(absolutePath ? absolutePath :
info->backingPath, R_OK);
VIR_FREE(absolutePath);
if (accessRetCode != 0) {
virReportSystemError(errno,
_("inaccessible backing store volume %s"),
info->backingPath);
return -1;
}
return 0;
}
static int
virStorageBackendCreateQemuImgSetOptions(virCommandPtr cmd,
int imgformat,
virStorageEncryptionInfoDefPtr enc,
struct _virStorageBackendQemuImgInfo info)
{
char *opts = NULL;
if (info.format == VIR_STORAGE_FILE_QCOW2 && !info.compat &&
imgformat >= QEMU_IMG_BACKING_FORMAT_OPTIONS_COMPAT)
info.compat = "0.10";
if (virStorageBackendCreateQemuImgOpts(enc, &opts, info) < 0)
return -1;
if (opts)
virCommandAddArgList(cmd, "-o", opts, NULL);
VIR_FREE(opts);
return 0;
}
/* Add a secret object to the command line:
* --object secret,id=$secretAlias,file=$secretPath
*
* NB: format=raw is assumed
*/
static int
virStorageBackendCreateQemuImgSecretObject(virCommandPtr cmd,
virStorageVolDefPtr vol,
struct _virStorageBackendQemuImgInfo *info)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
char *commandStr = NULL;
if (virAsprintf(&info->secretAlias, "%s_luks0", vol->name) < 0)
return -1;
virBufferAsprintf(&buf, "secret,id=%s,file=", info->secretAlias);
virQEMUBuildBufferEscapeComma(&buf, info->secretPath);
if (virBufferCheckError(&buf) < 0) {
virBufferFreeAndReset(&buf);
return -1;
}
commandStr = virBufferContentAndReset(&buf);
virCommandAddArgList(cmd, "--object", commandStr, NULL);
VIR_FREE(commandStr);
return 0;
}
/* Create a qemu-img virCommand from the supplied binary path,
* volume definitions and imgformat
*/
virCommandPtr
virStorageBackendCreateQemuImgCmdFromVol(virConnectPtr conn,
virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
unsigned int flags,
const char *create_tool,
int imgformat,
const char *secretPath)
{
virCommandPtr cmd = NULL;
const char *type;
struct _virStorageBackendQemuImgInfo info = {
.format = vol->target.format,
.path = vol->target.path,
.encryption = vol->target.encryption != NULL,
.preallocate = !!(flags & VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA),
.compat = vol->target.compat,
.features = vol->target.features,
.nocow = vol->target.nocow,
.secretPath = secretPath,
.secretAlias = NULL,
};
virStorageEncryptionInfoDefPtr enc = NULL;
virCheckFlags(VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA, NULL);
/* Treat output block devices as 'raw' format */
if (vol->type == VIR_STORAGE_VOL_BLOCK)
info.format = VIR_STORAGE_FILE_RAW;
if (!(type = virStorageFileFormatTypeToString(info.format))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("unknown storage vol type %d"),
info.format);
return NULL;
}
if (info.preallocate && info.format != VIR_STORAGE_FILE_QCOW2) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("metadata preallocation only available with qcow2"));
return NULL;
}
if (info.compat && info.format != VIR_STORAGE_FILE_QCOW2) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("compatibility option only available with qcow2"));
return NULL;
}
if (info.features && info.format != VIR_STORAGE_FILE_QCOW2) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("format features only available with qcow2"));
return NULL;
}
if (info.format == VIR_STORAGE_FILE_RAW &&
vol->target.encryption != NULL) {
if (inputvol) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("cannot use inputvol with encrypted raw volume"));
return NULL;
}
if (!info.encryption) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("missing encryption description"));
return NULL;
}
if (vol->target.encryption->format == VIR_STORAGE_ENCRYPTION_FORMAT_LUKS) {
type = "luks";
} else {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Only luks encryption is supported for raw files"));
return NULL;
}
}
if (inputvol &&
virStorageBackendCreateQemuImgSetInput(inputvol, &info) < 0)
return NULL;
if (vol->target.backingStore &&
virStorageBackendCreateQemuImgSetBacking(pool, vol, inputvol,
&info) < 0)
return NULL;
if (info.encryption &&
virStorageBackendCreateQemuImgCheckEncryption(info.format, type,
conn, vol) < 0)
return NULL;
/* Size in KB */
info.size_arg = VIR_DIV_UP(vol->target.capacity, 1024);
cmd = virCommandNew(create_tool);
/* ignore the backing volume when we're converting a volume */
if (info.inputPath)
info.backingPath = NULL;
if (info.inputPath)
virCommandAddArgList(cmd, "convert", "-f", info.inputFormatStr,
"-O", type, NULL);
else
virCommandAddArgList(cmd, "create", "-f", type, NULL);
if (info.backingPath)
virCommandAddArgList(cmd, "-b", info.backingPath, NULL);
if (info.format == VIR_STORAGE_FILE_RAW &&
vol->target.encryption != NULL &&
vol->target.encryption->format == VIR_STORAGE_ENCRYPTION_FORMAT_LUKS) {
if (virStorageBackendCreateQemuImgSecretObject(cmd, vol, &info) < 0) {
VIR_FREE(info.secretAlias);
virCommandFree(cmd);
return NULL;
}
enc = &vol->target.encryption->encinfo;
}
if (virStorageBackendCreateQemuImgSetOptions(cmd, imgformat,
enc, info) < 0) {
VIR_FREE(info.secretAlias);
virCommandFree(cmd);
return NULL;
}
VIR_FREE(info.secretAlias);
if (info.inputPath)
virCommandAddArg(cmd, info.inputPath);
virCommandAddArg(cmd, info.path);
if (!info.inputPath && (info.size_arg || !info.backingPath))
virCommandAddArgFormat(cmd, "%lluK", info.size_arg);
return cmd;
}
static char *
virStorageBackendCreateQemuImgSecretPath(virConnectPtr conn,
virStoragePoolObjPtr pool,
virStorageVolDefPtr vol)
{
virStorageEncryptionPtr enc = vol->target.encryption;
char *secretPath = NULL;
int fd = -1;
uint8_t *secret = NULL;
size_t secretlen = 0;
if (!enc) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("missing encryption description"));
return NULL;
}
if (!conn || !conn->secretDriver ||
!conn->secretDriver->secretLookupByUUID ||
!conn->secretDriver->secretLookupByUsage ||
!conn->secretDriver->secretGetValue) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("unable to look up encryption secret"));
return NULL;
}
if (!(secretPath = virStoragePoolObjBuildTempFilePath(pool, vol)))
goto cleanup;
if ((fd = mkostemp(secretPath, O_CLOEXEC)) < 0) {
virReportSystemError(errno, "%s",
_("failed to open luks secret file for write"));
goto error;
}
if (virSecretGetSecretString(conn, &enc->secrets[0]->seclookupdef,
VIR_SECRET_USAGE_TYPE_VOLUME,
&secret, &secretlen) < 0)
goto error;
if (safewrite(fd, secret, secretlen) < 0) {
virReportSystemError(errno, "%s",
_("failed to write luks secret file"));
goto error;
}
VIR_FORCE_CLOSE(fd);
if ((vol->target.perms->uid != (uid_t) -1) &&
(vol->target.perms->gid != (gid_t) -1)) {
if (chown(secretPath, vol->target.perms->uid,
vol->target.perms->gid) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("failed to chown luks secret file"));
goto error;
}
}
cleanup:
VIR_DISPOSE_N(secret, secretlen);
VIR_FORCE_CLOSE(fd);
return secretPath;
error:
unlink(secretPath);
VIR_FREE(secretPath);
goto cleanup;
}
int
virStorageBackendCreateQemuImg(virConnectPtr conn,
virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
unsigned int flags)
{
int ret = -1;
char *create_tool;
int imgformat;
virCommandPtr cmd;
char *secretPath = NULL;
virCheckFlags(VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA, -1);
create_tool = virFindFileInPath("qemu-img");
if (!create_tool) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("creation of non-raw file images is "
"not supported without qemu-img."));
return -1;
}
imgformat = virStorageBackendQEMUImgBackingFormat(create_tool);
if (imgformat < 0)
goto cleanup;
if (vol->target.format == VIR_STORAGE_FILE_RAW &&
vol->target.encryption->format == VIR_STORAGE_ENCRYPTION_FORMAT_LUKS) {
if (!(secretPath =
virStorageBackendCreateQemuImgSecretPath(conn, pool, vol)))
goto cleanup;
}
cmd = virStorageBackendCreateQemuImgCmdFromVol(conn, pool, vol, inputvol,
flags, create_tool,
imgformat, secretPath);
if (!cmd)
goto cleanup;
ret = virStorageBackendCreateExecCommand(pool, vol, cmd);
virCommandFree(cmd);
cleanup:
if (secretPath) {
unlink(secretPath);
VIR_FREE(secretPath);
}
VIR_FREE(create_tool);
return ret;
}
virStorageBackendBuildVolFrom
virStorageBackendGetBuildVolFromFunction(virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol)
{
if (!inputvol)
return NULL;
/* If either volume is a non-raw file vol, or uses encryption,
* we need to use an external tool for converting
*/
if ((vol->type == VIR_STORAGE_VOL_FILE &&
(vol->target.format != VIR_STORAGE_FILE_RAW ||
vol->target.encryption != NULL)) ||
(inputvol->type == VIR_STORAGE_VOL_FILE &&
(inputvol->target.format != VIR_STORAGE_FILE_RAW ||
inputvol->target.encryption != NULL))) {
return virStorageBackendCreateQemuImg;
}
if (vol->type == VIR_STORAGE_VOL_PLOOP)
return virStorageBackendCreatePloop;
if (vol->type == VIR_STORAGE_VOL_BLOCK)
return virStorageBackendCreateBlockFrom;
else
return virStorageBackendCreateRaw;
}
virStorageBackendPtr
virStorageBackendForType(int type)
{
size_t i;
for (i = 0; backends[i]; i++)
if (backends[i]->type == type)
return backends[i];
virReportError(VIR_ERR_INTERNAL_ERROR,
_("missing backend for pool type %d (%s)"),
type, NULLSTR(virStoragePoolTypeToString(type)));
return NULL;
}
virStorageFileBackendPtr
virStorageFileBackendForTypeInternal(int type,
int protocol,
bool report)
{
size_t i;
for (i = 0; fileBackends[i]; i++) {
if (fileBackends[i]->type == type) {
if (type == VIR_STORAGE_TYPE_NETWORK &&
fileBackends[i]->protocol != protocol)
continue;
return fileBackends[i];
}
}
if (!report)
return NULL;
if (type == VIR_STORAGE_TYPE_NETWORK) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("missing storage backend for network files "
"using %s protocol"),
virStorageNetProtocolTypeToString(protocol));
} else {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("missing storage backend for '%s' storage"),
virStorageTypeToString(type));
}
return NULL;
}
virStorageFileBackendPtr
virStorageFileBackendForType(int type,
int protocol)
{
return virStorageFileBackendForTypeInternal(type, protocol, true);
}
struct diskType {
int part_table_type;
unsigned short offset;
unsigned short length;
unsigned long long magic;
};
static struct diskType const disk_types[] = {
{ VIR_STORAGE_POOL_DISK_LVM2, 0x218, 8, 0x31303020324D564CULL },
{ VIR_STORAGE_POOL_DISK_GPT, 0x200, 8, 0x5452415020494645ULL },
{ VIR_STORAGE_POOL_DISK_DVH, 0x0, 4, 0x41A9E50BULL },
{ VIR_STORAGE_POOL_DISK_MAC, 0x0, 2, 0x5245ULL },
{ VIR_STORAGE_POOL_DISK_BSD, 0x40, 4, 0x82564557ULL },
{ VIR_STORAGE_POOL_DISK_SUN, 0x1fc, 2, 0xBEDAULL },
/*
* NOTE: pc98 is funky; the actual signature is 0x55AA (just like dos), so
* we can't use that. At the moment I'm relying on the "dummy" IPL
* bootloader data that comes from parted. Luckily, the chances of running
* into a pc98 machine running libvirt are approximately nil.
*/
/*{ 0x1fe, 2, 0xAA55UL },*/
{ VIR_STORAGE_POOL_DISK_PC98, 0x0, 8, 0x314C5049000000CBULL },
/*
* NOTE: the order is important here; some other disk types (like GPT and
* and PC98) also have 0x55AA at this offset. For that reason, the DOS
* one must be the last one.
*/
{ VIR_STORAGE_POOL_DISK_DOS, 0x1fe, 2, 0xAA55ULL },
{ -1, 0x0, 0, 0x0ULL },
};
/*
* virStorageBackendDetectBlockVolFormatFD
* @target: target definition ptr of volume to update
* @fd: fd of storage volume to update,
* @readflags: VolReadErrorMode flags to handle read error after open
* is successful, but read is not.
*
* Returns 0 for success, -1 on a legitimate error condition, -2 if
* the read error is desired to be ignored (along with appropriate
* VIR_WARN of the issue).
*/
static int
virStorageBackendDetectBlockVolFormatFD(virStorageSourcePtr target,
int fd,
unsigned int readflags)
{
size_t i;
off_t start;
unsigned char buffer[1024];
ssize_t bytes;
/* make sure to set the target format "unknown" to begin with */
target->format = VIR_STORAGE_POOL_DISK_UNKNOWN;
start = lseek(fd, 0, SEEK_SET);
if (start < 0) {
virReportSystemError(errno,
_("cannot seek to beginning of file '%s'"),
target->path);
return -1;
}
bytes = saferead(fd, buffer, sizeof(buffer));
if (bytes < 0) {
if (readflags & VIR_STORAGE_VOL_READ_NOERROR) {
VIR_WARN("ignoring failed saferead of file '%s'",
target->path);
return -2;
} else {
virReportSystemError(errno,
_("cannot read beginning of file '%s'"),
target->path);
return -1;
}
}
for (i = 0; disk_types[i].part_table_type != -1; i++) {
if (disk_types[i].offset + disk_types[i].length > bytes)
continue;
if (memcmp(buffer+disk_types[i].offset, &disk_types[i].magic,
disk_types[i].length) == 0) {
target->format = disk_types[i].part_table_type;
break;
}
}
if (target->format == VIR_STORAGE_POOL_DISK_UNKNOWN)
VIR_DEBUG("cannot determine the target format for '%s'",
target->path);
return 0;
}
/*
* Allows caller to silently ignore files with improper mode
*
* Returns -1 on error. If VIR_STORAGE_VOL_OPEN_NOERROR is passed, we
* return -2 if file mode is unexpected or the volume is a dangling
* symbolic link.
*/
int
virStorageBackendVolOpen(const char *path, struct stat *sb,
unsigned int flags)
{
int fd, mode = 0;
char *base = last_component(path);
bool noerror = (flags & VIR_STORAGE_VOL_OPEN_NOERROR);
if (lstat(path, sb) < 0) {
if (errno == ENOENT) {
if (noerror) {
VIR_WARN("ignoring missing file '%s'", path);
return -2;
}
virReportError(VIR_ERR_NO_STORAGE_VOL,
_("no storage vol with matching path '%s'"),
path);
return -1;
}
virReportSystemError(errno,
_("cannot stat file '%s'"),
path);
return -1;
}
if (S_ISFIFO(sb->st_mode)) {
if (noerror) {
VIR_WARN("ignoring FIFO '%s'", path);
return -2;
}
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Volume path '%s' is a FIFO"), path);
return -1;
} else if (S_ISSOCK(sb->st_mode)) {
if (noerror) {
VIR_WARN("ignoring socket '%s'", path);
return -2;
}
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Volume path '%s' is a socket"), path);
return -1;
}
/* O_NONBLOCK should only matter during open() for fifos and
* sockets, which we already filtered; but using it prevents a
* TOCTTOU race. However, later on we will want to read() the
* header from this fd, and virFileRead* routines require a
* blocking fd, so fix it up after verifying we avoided a race.
*
* Use of virFileOpenAs allows this path to open a file using
* the uid and gid as it was created in order to open. Since this
* path is not using O_CREAT or O_TMPFILE, mode is meaningless.
* Opening under user/group is especially important in an NFS
* root-squash environment. If the target path isn't on shared
* file system, the open will fail in the OPEN_FORK path.
*/
if ((fd = virFileOpenAs(path, O_RDONLY|O_NONBLOCK|O_NOCTTY,
0, sb->st_uid, sb->st_gid,
VIR_FILE_OPEN_NOFORK|VIR_FILE_OPEN_FORK)) < 0) {
if ((errno == ENOENT || errno == ELOOP) &&
S_ISLNK(sb->st_mode) && noerror) {
VIR_WARN("ignoring dangling symlink '%s'", path);
return -2;
}
if (errno == ENOENT && noerror) {
VIR_WARN("ignoring missing file '%s'", path);
return -2;
}
if (errno == ENXIO && noerror) {
VIR_WARN("ignoring missing fifo '%s'", path);
return -2;
}
if ((errno == EACCES || errno == EPERM) && noerror) {
VIR_WARN("ignoring permission error for '%s'", path);
return -2;
}
virReportSystemError(errno, _("cannot open volume '%s'"), path);
return -1;
}
if (fstat(fd, sb) < 0) {
virReportSystemError(errno, _("cannot stat file '%s'"), path);
VIR_FORCE_CLOSE(fd);
return -1;
}
if (S_ISREG(sb->st_mode)) {
mode = VIR_STORAGE_VOL_OPEN_REG;
} else if (S_ISCHR(sb->st_mode)) {
mode = VIR_STORAGE_VOL_OPEN_CHAR;
} else if (S_ISBLK(sb->st_mode)) {
mode = VIR_STORAGE_VOL_OPEN_BLOCK;
} else if (S_ISDIR(sb->st_mode)) {
mode = VIR_STORAGE_VOL_OPEN_DIR;
if (STREQ(base, ".") ||
STREQ(base, "..")) {
VIR_FORCE_CLOSE(fd);
if (noerror) {
VIR_INFO("Skipping special dir '%s'", base);
return -2;
}
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Cannot use volume path '%s'"), path);
return -1;
}
} else {
VIR_FORCE_CLOSE(fd);
if (noerror) {
VIR_WARN("ignoring unexpected type for file '%s'", path);
return -2;
}
virReportError(VIR_ERR_INTERNAL_ERROR,
_("unexpected type for file '%s'"), path);
return -1;
}
if (virSetBlocking(fd, true) < 0) {
VIR_FORCE_CLOSE(fd);
virReportSystemError(errno, _("unable to set blocking mode for '%s'"),
path);
return -1;
}
if (!(mode & flags)) {
VIR_FORCE_CLOSE(fd);
if (noerror) {
VIR_INFO("Skipping volume '%s'", path);
return -2;
}
virReportError(VIR_ERR_INTERNAL_ERROR,
_("unexpected storage mode for '%s'"), path);
return -1;
}
return fd;
}
/* virStorageIsPloop function checks whether given directory is ploop volume's
* directory.
*/
bool
virStorageBackendIsPloopDir(char *path)
{
bool ret = false;
char *root = NULL;
char *desc = NULL;
if (virAsprintf(&root, "%s/root.hds", path) < 0)
return ret;
if (!virFileExists(root))
goto cleanup;
if (virAsprintf(&desc, "%s/DiskDescriptor.xml", path) < 0)
goto cleanup;
if (!virFileExists(desc))
goto cleanup;
ret = true;
cleanup:
VIR_FREE(root);
VIR_FREE(desc);
return ret;
}
/* In case of ploop volumes, path to volume is the path to the ploop
* directory. To get information about allocation, header information
* and etc. we need to perform virStorageBackendVolOpen and
* virStorageBackendUpdateVolTargetFd once again.
*/
int
virStorageBackendRedoPloopUpdate(virStorageSourcePtr target, struct stat *sb,
int *fd, unsigned int flags)
{
char *path = NULL;
int ret = -1;
if (virAsprintf(&path, "%s/root.hds", target->path) < 0)
return -1;
VIR_FORCE_CLOSE(*fd);
if ((*fd = virStorageBackendVolOpen(path, sb, flags)) < 0)
goto cleanup;
ret = virStorageBackendUpdateVolTargetInfoFD(target, *fd, sb);
cleanup:
VIR_FREE(path);
return ret;
}
/*
* virStorageBackendUpdateVolTargetInfo
* @target: target definition ptr of volume to update
* @withBlockVolFormat: true if caller determined a block file
* @openflags: various VolOpenCheckMode flags to handle errors on open
* @readflags: VolReadErrorMode flags to handle read error after open
* is successful, but read is not.
*
* Returns 0 for success, -1 on a legitimate error condition, and -2
* if the openflags used VIR_STORAGE_VOL_OPEN_NOERROR and some sort of
* open error occurred. It is up to the caller to handle. A -2 may also
* be returned if the caller passed a readflagsflag.
*/
int
virStorageBackendUpdateVolTargetInfo(virStorageSourcePtr target,
bool withBlockVolFormat,
unsigned int openflags,
unsigned int readflags)
{
int ret, fd = -1;
struct stat sb;
virStorageSourcePtr meta = NULL;
char *buf = NULL;
ssize_t len = VIR_STORAGE_MAX_HEADER;
if ((ret = virStorageBackendVolOpen(target->path, &sb, openflags)) < 0)
goto cleanup;
fd = ret;
if ((ret = virStorageBackendUpdateVolTargetInfoFD(target, fd, &sb)) < 0)
goto cleanup;
if (target->type == VIR_STORAGE_VOL_FILE &&
target->format != VIR_STORAGE_FILE_NONE) {
if (S_ISDIR(sb.st_mode)) {
if (virStorageBackendIsPloopDir(target->path)) {
if ((ret = virStorageBackendRedoPloopUpdate(target, &sb, &fd,
openflags)) < 0)
goto cleanup;
target->format = VIR_STORAGE_FILE_PLOOP;
} else {
ret = 0;
goto cleanup;
}
}
if (lseek(fd, 0, SEEK_SET) == (off_t)-1) {
virReportSystemError(errno, _("cannot seek to start of '%s'"), target->path);
ret = -1;
goto cleanup;
}
if ((len = virFileReadHeaderFD(fd, len, &buf)) < 0) {
if (readflags & VIR_STORAGE_VOL_READ_NOERROR) {
VIR_WARN("ignoring failed header read for '%s'",
target->path);
ret = -2;
} else {
virReportSystemError(errno,
_("cannot read header '%s'"),
target->path);
ret = -1;
}
goto cleanup;
}
if (!(meta = virStorageFileGetMetadataFromBuf(target->path, buf, len, target->format,
NULL))) {
ret = -1;
goto cleanup;
}
if (meta->capacity)
target->capacity = meta->capacity;
}
if (withBlockVolFormat) {
if ((ret = virStorageBackendDetectBlockVolFormatFD(target, fd,
readflags)) < 0)
goto cleanup;
}
cleanup:
virStorageSourceFree(meta);
VIR_FORCE_CLOSE(fd);
VIR_FREE(buf);
return ret;
}
/*
* virStorageBackendUpdateVolInfo
* @vol: Pointer to a volume storage definition
* @withBlockVolFormat: true if the caller determined a block file
* @openflags: various VolOpenCheckMode flags to handle errors on open
* @readflags: various VolReadErrorMode flags to handle errors on read
*
* Returns 0 for success, -1 on a legitimate error condition, and -2
* if the openflags used VIR_STORAGE_VOL_OPEN_NOERROR and some sort of
* open error occurred. It is up to the caller to handle.
*/
int
virStorageBackendUpdateVolInfo(virStorageVolDefPtr vol,
bool withBlockVolFormat,
unsigned int openflags,
unsigned int readflags)
{
int ret;
if ((ret = virStorageBackendUpdateVolTargetInfo(&vol->target,
withBlockVolFormat,
openflags, readflags)) < 0)
return ret;
if (vol->target.backingStore &&
(ret = virStorageBackendUpdateVolTargetInfo(vol->target.backingStore,
withBlockVolFormat,
VIR_STORAGE_VOL_OPEN_DEFAULT |
VIR_STORAGE_VOL_OPEN_NOERROR,
readflags) < 0))
return ret;
return 0;
}
/*
* virStorageBackendUpdateVolTargetInfoFD:
* @target: target definition ptr of volume to update
* @fd: fd of storage volume to update, via virStorageBackendOpenVol*, or -1
* @sb: details about file (must match @fd, if that is provided)
*
* Returns 0 for success, -1 on a legitimate error condition.
*/
int
virStorageBackendUpdateVolTargetInfoFD(virStorageSourcePtr target,
int fd,
struct stat *sb)
{
#if WITH_SELINUX
security_context_t filecon = NULL;
#endif
if (S_ISREG(sb->st_mode)) {
#ifndef WIN32
target->allocation = (unsigned long long)sb->st_blocks *
(unsigned long long)DEV_BSIZE;
#else
target->allocation = sb->st_size;
#endif
/* Regular files may be sparse, so logical size (capacity) is not same
* as actual allocation above
*/
target->capacity = sb->st_size;
} else if (S_ISDIR(sb->st_mode)) {
target->allocation = 0;
target->capacity = 0;
} else if (fd >= 0) {
off_t end;
/* XXX this is POSIX compliant, but doesn't work for CHAR files,
* only BLOCK. There is a Linux specific ioctl() for getting
* size of both CHAR / BLOCK devices we should check for in
* configure
*/
end = lseek(fd, 0, SEEK_END);
if (end == (off_t)-1) {
virReportSystemError(errno,
_("cannot seek to end of file '%s'"),
target->path);
return -1;
}
target->allocation = end;
target->capacity = end;
}
if (!target->perms && VIR_ALLOC(target->perms) < 0)
return -1;
target->perms->mode = sb->st_mode & S_IRWXUGO;
target->perms->uid = sb->st_uid;
target->perms->gid = sb->st_gid;
if (!target->timestamps && VIR_ALLOC(target->timestamps) < 0)
return -1;
target->timestamps->atime = get_stat_atime(sb);
target->timestamps->btime = get_stat_birthtime(sb);
target->timestamps->ctime = get_stat_ctime(sb);
target->timestamps->mtime = get_stat_mtime(sb);
VIR_FREE(target->perms->label);
#if WITH_SELINUX
/* XXX: make this a security driver call */
if (fd >= 0) {
if (fgetfilecon_raw(fd, &filecon) == -1) {
if (errno != ENODATA && errno != ENOTSUP) {
virReportSystemError(errno,
_("cannot get file context of '%s'"),
target->path);
return -1;
}
} else {
if (VIR_STRDUP(target->perms->label, filecon) < 0) {
freecon(filecon);
return -1;
}
freecon(filecon);
}
}
#endif
return 0;
}
bool
virStorageBackendPoolPathIsStable(const char *path)
{
if (path == NULL || STREQ(path, "/dev") || STREQ(path, "/dev/"))
return false;
if (!STRPREFIX(path, "/dev/"))
return false;
return true;
}
/*
* Given a volume path directly in /dev/XXX, iterate over the
* entries in the directory pool->def->target.path and find the
* first symlink pointing to the volume path.
*
* If, the target.path is /dev/, then return the original volume
* path.
*
* If no symlink is found, then return the original volume path
*
* Typically target.path is one of the /dev/disk/by-XXX dirs
* with stable paths.
*
* If 'loop' is true, we use a timeout loop to give dynamic paths
* a change to appear.
*/
char *
virStorageBackendStablePath(virStoragePoolObjPtr pool,
const char *devpath,
bool loop)
{
DIR *dh;
struct dirent *dent;
char *stablepath;
int opentries = 0;
int retry = 0;
int direrr;
/* Logical pools are under /dev but already have stable paths */
if (pool->def->type == VIR_STORAGE_POOL_LOGICAL ||
!virStorageBackendPoolPathIsStable(pool->def->target.path))
goto ret_strdup;
/* We loop here because /dev/disk/by-{id,path} may not have existed
* before we started this operation, so we have to give it some time to
* get created.
*/
reopen:
if (virDirOpenQuiet(&dh, pool->def->target.path) < 0) {
opentries++;
if (loop && errno == ENOENT && opentries < 50) {
usleep(100 * 1000);
goto reopen;
}
virReportSystemError(errno,
_("cannot read dir '%s'"),
pool->def->target.path);
return NULL;
}
/* The pool is pointing somewhere like /dev/disk/by-path
* or /dev/disk/by-id, so we need to check all symlinks in
* the target directory and figure out which one points
* to this device node.
*
* And it might need some time till the stable path shows
* up, so add timeout to retry here. Ignore readdir failures,
* since we have a fallback.
*/
retry:
while ((direrr = virDirRead(dh, &dent, NULL)) > 0) {
if (virAsprintf(&stablepath, "%s/%s",
pool->def->target.path,
dent->d_name) == -1) {
VIR_DIR_CLOSE(dh);
return NULL;
}
if (virFileLinkPointsTo(stablepath, devpath)) {
VIR_DIR_CLOSE(dh);
return stablepath;
}
VIR_FREE(stablepath);
}
if (!direrr && loop && ++retry < 100) {
usleep(100 * 1000);
goto retry;
}
VIR_DIR_CLOSE(dh);
ret_strdup:
/* Couldn't find any matching stable link so give back
* the original non-stable dev path
*/
ignore_value(VIR_STRDUP(stablepath, devpath));
return stablepath;
}
/*
* Check whether the ploop image has snapshots.
* return: -1 - failed to check
* 0 - no snapshots
* 1 - at least one snapshot
*/
static int
virStorageBackendPloopHasSnapshots(char *path)
{
virCommandPtr cmd = NULL;
char *output = NULL;
char *snap_tool = NULL;
int ret = -1;
snap_tool = virFindFileInPath("ploop");
if (!snap_tool) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("unable to find ploop, please install "
"ploop tools"));
return ret;
}
cmd = virCommandNewArgList(snap_tool, "snapshot-list", NULL);
virCommandAddArgFormat(cmd, "%s/DiskDescriptor.xml", path);
virCommandSetOutputBuffer(cmd, &output);
if ((ret = virCommandRun(cmd, NULL)) < 0)
goto cleanup;
if (!strstr(output, "root.hds.")) {
ret = 1;
goto cleanup;
}
ret = 0;
cleanup:
VIR_FREE(output);
virCommandFree(cmd);
return ret;
}
int
virStorageBackendVolUploadLocal(virConnectPtr conn ATTRIBUTE_UNUSED,
virStoragePoolObjPtr pool ATTRIBUTE_UNUSED,
virStorageVolDefPtr vol,
virStreamPtr stream,
unsigned long long offset,
unsigned long long len,
unsigned int flags)
{
char *path = NULL;
char *target_path = vol->target.path;
int ret = -1;
int has_snap = 0;
virCheckFlags(0, -1);
/* if volume has target format VIR_STORAGE_FILE_PLOOP
* we need to restore DiskDescriptor.xml, according to
* new contents of volume. This operation will be perfomed
* when volUpload is fully finished. */
if (vol->target.format == VIR_STORAGE_FILE_PLOOP) {
/* Fail if the volume contains snapshots or we failed to check it.*/
has_snap = virStorageBackendPloopHasSnapshots(vol->target.path);
if (has_snap < 0) {
goto cleanup;
} else if (!has_snap) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("can't upload volume, all existing snapshots"
" will be lost"));
goto cleanup;
}
if (virAsprintf(&path, "%s/root.hds", vol->target.path) < 0)
return -1;
target_path = path;
}
/* Not using O_CREAT because the file is required to already exist at
* this point */
ret = virFDStreamOpenBlockDevice(stream, target_path,
offset, len, O_WRONLY);
cleanup:
VIR_FREE(path);
return ret;
}
int
virStorageBackendVolDownloadLocal(virConnectPtr conn ATTRIBUTE_UNUSED,
virStoragePoolObjPtr pool ATTRIBUTE_UNUSED,
virStorageVolDefPtr vol,
virStreamPtr stream,
unsigned long long offset,
unsigned long long len,
unsigned int flags)
{
char *path = NULL;
char *target_path = vol->target.path;
int ret = -1;
int has_snap = 0;
virCheckFlags(0, -1);
if (vol->target.format == VIR_STORAGE_FILE_PLOOP) {
has_snap = virStorageBackendPloopHasSnapshots(vol->target.path);
if (has_snap < 0) {
goto cleanup;
} else if (!has_snap) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("can't download volume, all existing snapshots"
" will be lost"));
goto cleanup;
}
if (virAsprintf(&path, "%s/root.hds", vol->target.path) < 0)
goto cleanup;
target_path = path;
}
ret = virFDStreamOpenBlockDevice(stream, target_path,
offset, len, O_RDONLY);
cleanup:
VIR_FREE(path);
return ret;
}
/* If the volume we're wiping is already a sparse file, we simply
* truncate and extend it to its original size, filling it with
* zeroes. This behavior is guaranteed by POSIX:
*
* http://www.opengroup.org/onlinepubs/9699919799/functions/ftruncate.html
*
* If fildes refers to a regular file, the ftruncate() function shall
* cause the size of the file to be truncated to length. If the size
* of the file previously exceeded length, the extra data shall no
* longer be available to reads on the file. If the file previously
* was smaller than this size, ftruncate() shall increase the size of
* the file. If the file size is increased, the extended area shall
* appear as if it were zero-filled.
*/
static int
virStorageBackendVolZeroSparseFileLocal(const char *path,
off_t size,
int fd)
{
if (ftruncate(fd, 0) < 0) {
virReportSystemError(errno,
_("Failed to truncate volume with "
"path '%s' to 0 bytes"),
path);
return -1;
}
if (ftruncate(fd, size) < 0) {
virReportSystemError(errno,
_("Failed to truncate volume with "
"path '%s' to %ju bytes"),
path, (uintmax_t)size);
return -1;
}
return 0;
}
static int
virStorageBackendWipeLocal(const char *path,
int fd,
unsigned long long wipe_len,
size_t writebuf_length)
{
int ret = -1, written = 0;
unsigned long long remaining = 0;
size_t write_size = 0;
char *writebuf = NULL;
VIR_DEBUG("wiping start: 0 len: %llu", wipe_len);
if (VIR_ALLOC_N(writebuf, writebuf_length) < 0)
goto cleanup;
if (lseek(fd, 0, SEEK_SET) < 0) {
virReportSystemError(errno,
_("Failed to seek to the start in volume "
"with path '%s'"),
path);
goto cleanup;
}
remaining = wipe_len;
while (remaining > 0) {
write_size = (writebuf_length < remaining) ? writebuf_length : remaining;
written = safewrite(fd, writebuf, write_size);
if (written < 0) {
virReportSystemError(errno,
_("Failed to write %zu bytes to "
"storage volume with path '%s'"),
write_size, path);
goto cleanup;
}
remaining -= written;
}
if (fdatasync(fd) < 0) {
virReportSystemError(errno,
_("cannot sync data to volume with path '%s'"),
path);
goto cleanup;
}
VIR_DEBUG("Wrote %llu bytes to volume with path '%s'", wipe_len, path);
ret = 0;
cleanup:
VIR_FREE(writebuf);
return ret;
}
static int
virStorageBackendVolWipeLocalFile(const char *path,
unsigned int algorithm,
unsigned long long allocation)
{
int ret = -1, fd = -1;
const char *alg_char = NULL;
struct stat st;
virCommandPtr cmd = NULL;
fd = open(path, O_RDWR);
if (fd == -1) {
virReportSystemError(errno,
_("Failed to open storage volume with path '%s'"),
path);
goto cleanup;
}
if (fstat(fd, &st) == -1) {
virReportSystemError(errno,
_("Failed to stat storage volume with path '%s'"),
path);
goto cleanup;
}
switch ((virStorageVolWipeAlgorithm) algorithm) {
case VIR_STORAGE_VOL_WIPE_ALG_ZERO:
alg_char = "zero";
break;
case VIR_STORAGE_VOL_WIPE_ALG_NNSA:
alg_char = "nnsa";
break;
case VIR_STORAGE_VOL_WIPE_ALG_DOD:
alg_char = "dod";
break;
case VIR_STORAGE_VOL_WIPE_ALG_BSI:
alg_char = "bsi";
break;
case VIR_STORAGE_VOL_WIPE_ALG_GUTMANN:
alg_char = "gutmann";
break;
case VIR_STORAGE_VOL_WIPE_ALG_SCHNEIER:
alg_char = "schneier";
break;
case VIR_STORAGE_VOL_WIPE_ALG_PFITZNER7:
alg_char = "pfitzner7";
break;
case VIR_STORAGE_VOL_WIPE_ALG_PFITZNER33:
alg_char = "pfitzner33";
break;
case VIR_STORAGE_VOL_WIPE_ALG_RANDOM:
alg_char = "random";
break;
case VIR_STORAGE_VOL_WIPE_ALG_TRIM:
virReportError(VIR_ERR_ARGUMENT_UNSUPPORTED, "%s",
_("'trim' algorithm not supported"));
goto cleanup;
case VIR_STORAGE_VOL_WIPE_ALG_LAST:
virReportError(VIR_ERR_INVALID_ARG,
_("unsupported algorithm %d"),
algorithm);
goto cleanup;
}
VIR_DEBUG("Wiping file '%s' with algorithm '%s'", path, alg_char);
if (algorithm != VIR_STORAGE_VOL_WIPE_ALG_ZERO) {
cmd = virCommandNew(SCRUB);
virCommandAddArgList(cmd, "-f", "-p", alg_char, path, NULL);
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
ret = 0;
} else {
if (S_ISREG(st.st_mode) && st.st_blocks < (st.st_size / DEV_BSIZE)) {
ret = virStorageBackendVolZeroSparseFileLocal(path, st.st_size, fd);
} else {
ret = virStorageBackendWipeLocal(path,
fd,
allocation,
st.st_blksize);
}
if (ret < 0)
goto cleanup;
}
cleanup:
virCommandFree(cmd);
VIR_FORCE_CLOSE(fd);
return ret;
}
static int
virStorageBackendVolWipePloop(virStorageVolDefPtr vol,
unsigned int algorithm)
{
virCommandPtr cmd = NULL;
char *target_path = NULL;
char *disk_desc = NULL;
char *create_tool = NULL;
int ret = -1;
create_tool = virFindFileInPath("ploop");
if (!create_tool) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("unable to find ploop tools, please install them"));
return -1;
}
if (virAsprintf(&target_path, "%s/root.hds", vol->target.path) < 0)
goto cleanup;
if (virAsprintf(&disk_desc, "%s/DiskDescriptor.xml", vol->target.path) < 0)
goto cleanup;
if (virStorageBackendVolWipeLocalFile(target_path,
algorithm,
vol->target.allocation) < 0)
goto cleanup;
if (virFileRemove(disk_desc, 0, 0) < 0) {
virReportError(errno, _("Failed to delete DiskDescriptor.xml of volume '%s'"),
vol->target.path);
goto cleanup;
}
if (virFileRemove(target_path, 0, 0) < 0) {
virReportError(errno, _("failed to delete root.hds of volume '%s'"),
vol->target.path);
goto cleanup;
}
cmd = virCommandNewArgList(create_tool, "init", "-s", NULL);
virCommandAddArgFormat(cmd, "%lluM", VIR_DIV_UP(vol->target.capacity,
(1024 * 1024)));
virCommandAddArgList(cmd, "-t", "ext4", NULL);
virCommandAddArg(cmd, target_path);
ret = virCommandRun(cmd, NULL);
cleanup:
VIR_FREE(disk_desc);
VIR_FREE(target_path);
VIR_FREE(create_tool);
virCommandFree(cmd);
return ret;
}
int
virStorageBackendVolWipeLocal(virConnectPtr conn ATTRIBUTE_UNUSED,
virStoragePoolObjPtr pool ATTRIBUTE_UNUSED,
virStorageVolDefPtr vol,
unsigned int algorithm,
unsigned int flags)
{
int ret = -1;
virCheckFlags(0, -1);
VIR_DEBUG("Wiping volume with path '%s' and algorithm %u",
vol->target.path, algorithm);
if (vol->target.format == VIR_STORAGE_FILE_PLOOP) {
ret = virStorageBackendVolWipePloop(vol, algorithm);
} else {
ret = virStorageBackendVolWipeLocalFile(vol->target.path,
algorithm,
vol->target.allocation);
}
return ret;
}
#ifdef GLUSTER_CLI
int
virStorageBackendFindGlusterPoolSources(const char *host,
int pooltype,
virStoragePoolSourceListPtr list)
{
char *outbuf = NULL;
virCommandPtr cmd = NULL;
xmlDocPtr doc = NULL;
xmlXPathContextPtr ctxt = NULL;
xmlNodePtr *nodes = NULL;
virStoragePoolSource *src = NULL;
size_t i;
int nnodes;
int rc;
int ret = -1;
cmd = virCommandNewArgList(GLUSTER_CLI,
"--xml",
"--log-file=/dev/null",
"volume", "info", "all", NULL);
virCommandAddArgFormat(cmd, "--remote-host=%s", host);
virCommandSetOutputBuffer(cmd, &outbuf);
if (virCommandRun(cmd, &rc) < 0)
goto cleanup;
if (rc != 0) {
VIR_INFO("failed to query host '%s' for gluster volumes: %s",
host, outbuf);
ret = 0;
goto cleanup;
}
if (!(doc = virXMLParseStringCtxt(outbuf, _("(gluster_cli_output)"),
&ctxt)))
goto cleanup;
if ((nnodes = virXPathNodeSet("//volumes/volume", ctxt, &nodes)) <= 0) {
VIR_INFO("no gluster volumes available on '%s'", host);
ret = 0;
goto cleanup;
}
for (i = 0; i < nnodes; i++) {
ctxt->node = nodes[i];
if (!(src = virStoragePoolSourceListNewSource(list)))
goto cleanup;
if (!(src->dir = virXPathString("string(//name)", ctxt))) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("failed to extract gluster volume name"));
goto cleanup;
}
if (VIR_ALLOC_N(src->hosts, 1) < 0)
goto cleanup;
src->nhost = 1;
if (VIR_STRDUP(src->hosts[0].name, host) < 0)
goto cleanup;
src->format = pooltype;
}
ret = 0;
cleanup:
VIR_FREE(nodes);
xmlXPathFreeContext(ctxt);
xmlFreeDoc(doc);
VIR_FREE(outbuf);
virCommandFree(cmd);
return ret;
}
#else /* #ifdef GLUSTER_CLI */
int
virStorageBackendFindGlusterPoolSources(const char *host ATTRIBUTE_UNUSED,
int pooltype ATTRIBUTE_UNUSED,
virStoragePoolSourceListPtr list ATTRIBUTE_UNUSED)
{
VIR_INFO("gluster cli tool not installed");
return 0;
}
#endif /* #ifdef GLUSTER_CLI */
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