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libvirt/src/storage/storage_util.c
Wim ten Have c9ec7088c7 storage: extend preallocation flags support for qemu-img 
This patch adds support to qcow2 formatted filesystem object storage by
instructing qemu-img to build them with preallocation=falloc whenever the
XML described storage <allocation> matches its <capacity>.  For all other
cases the filesystem stored objects are built with preallocation=metadata.

Signed-off-by: Wim ten Have <wim.ten.have@oracle.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
2018-04-11 10:15:58 +02:00

4270 lines
130 KiB
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/*
* storage_util.c: helper functions for the storage driver
*
* 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/>.
*/
#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/statvfs.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_BLKID
# include <blkid.h>
#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_util.h"
#include "virlog.h"
#include "virfile.h"
#include "virjson.h"
#include "virqemu.h"
#include "stat-time.h"
#include "virstring.h"
#include "virxml.h"
#include "virfdstream.h"
#define VIR_FROM_THIS VIR_FROM_STORAGE
VIR_LOG_INIT("storage.storage_util");
#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
storageBackendCreateBlockFrom(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;
}
static int
storageBackendCreateRaw(virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
unsigned int flags)
{
virStoragePoolDefPtr def = virStoragePoolObjGetDef(pool);
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 (virStorageSourceHasBacking(&vol->target)) {
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 (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 = virSecretLookupByUUID(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(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;
virConnectPtr conn = NULL;
conn = virGetConnectSecret();
if (!conn)
return -1;
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_id, vol->target.path) < 0)
goto cleanup;
xml = virSecretDefFormat(def);
virSecretDefFree(def);
def = NULL;
if (xml == NULL)
goto cleanup;
secret = virSecretDefineXML(conn, xml, 0);
if (secret == NULL) {
VIR_FREE(xml);
goto cleanup;
}
VIR_FREE(xml);
if (virStorageGenerateQcowPassphrase(value) < 0)
goto cleanup;
if (virSecretSetValue(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)
virSecretUndefine(secret);
virObjectUnref(secret);
}
virObjectUnref(conn);
virBufferFreeAndReset(&buf);
virSecretDefFree(def);
VIR_FREE(enc_secret);
return ret;
}
static int
virStorageBackendCreateExecCommand(virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
virCommandPtr cmd)
{
virStoragePoolDefPtr def = virStoragePoolObjGetDef(pool);
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 ((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.*/
static int
storageBackendCreatePloop(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 (virStorageSourceHasBacking(&vol->target)) {
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;
}
static int
storagePloopResize(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;
unsigned long long allocation;
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
storageBackendCreateQemuImgOpts(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) {
if (info.size_arg > info.allocation)
virBufferAddLit(&buf, "preallocation=metadata,");
else
virBufferAddLit(&buf, "preallocation=falloc,");
}
}
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;
}
/* storageBackendCreateQemuImgCheckEncryption:
* @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
storageBackendCreateQemuImgCheckEncryption(int format,
const char *type,
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(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
storageBackendCreateQemuImgSetInput(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->inputFormat == VIR_STORAGE_FILE_ISO)
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
storageBackendCreateQemuImgSetBacking(virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
struct _virStorageBackendQemuImgInfo *info)
{
virStoragePoolDefPtr def = virStoragePoolObjGetDef(pool);
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 && virStorageSourceHasBacking(&inputvol->target) &&
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", 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
storageBackendCreateQemuImgSetOptions(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 (storageBackendCreateQemuImgOpts(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
storageBackendCreateQemuImgSecretObject(virCommandPtr cmd,
const char *secretPath,
const char *secretAlias)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
char *commandStr = NULL;
virBufferAsprintf(&buf, "secret,id=%s,file=", secretAlias);
virQEMUBuildBufferEscapeComma(&buf, secretPath);
if (virBufferCheckError(&buf) < 0) {
virBufferFreeAndReset(&buf);
return -1;
}
commandStr = virBufferContentAndReset(&buf);
virCommandAddArgList(cmd, "--object", commandStr, NULL);
VIR_FREE(commandStr);
return 0;
}
/* Add a --image-opts to the qemu-img resize command line:
* --image-opts driver=luks,file.filename=$volpath,key-secret=$secretAlias
*
* NB: format=raw is assumed
*/
static int
storageBackendResizeQemuImgImageOpts(virCommandPtr cmd,
const char *path,
const char *secretAlias)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
char *commandStr = NULL;
virBufferAsprintf(&buf, "driver=luks,key-secret=%s,file.filename=",
secretAlias);
virQEMUBuildBufferEscapeComma(&buf, path);
if (virBufferCheckError(&buf) < 0) {
virBufferFreeAndReset(&buf);
return -1;
}
commandStr = virBufferContentAndReset(&buf);
virCommandAddArgList(cmd, "--image-opts", commandStr, NULL);
VIR_FREE(commandStr);
return 0;
}
/* Create a qemu-img virCommand from the supplied binary path,
* volume definitions and imgformat
*/
virCommandPtr
virStorageBackendCreateQemuImgCmdFromVol(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,
.allocation = vol->target.allocation,
.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 (info.format == VIR_STORAGE_FILE_ISO)
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 &&
storageBackendCreateQemuImgSetInput(inputvol, &info) < 0)
return NULL;
if (virStorageSourceHasBacking(&vol->target) &&
storageBackendCreateQemuImgSetBacking(pool, vol, inputvol, &info) < 0)
return NULL;
if (info.encryption &&
storageBackendCreateQemuImgCheckEncryption(info.format, type,
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 (virAsprintf(&info.secretAlias, "%s_luks0", vol->name) < 0)
goto error;
if (storageBackendCreateQemuImgSecretObject(cmd, info.secretPath,
info.secretAlias) < 0)
goto error;
enc = &vol->target.encryption->encinfo;
}
if (storageBackendCreateQemuImgSetOptions(cmd, imgformat, enc, info) < 0)
goto error;
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;
error:
VIR_FREE(info.secretAlias);
virCommandFree(cmd);
return NULL;
}
static char *
storageBackendCreateQemuImgSecretPath(virStoragePoolObjPtr pool,
virStorageVolDefPtr vol)
{
virStorageEncryptionPtr enc = vol->target.encryption;
char *secretPath = NULL;
int fd = -1;
uint8_t *secret = NULL;
size_t secretlen = 0;
virConnectPtr conn = NULL;
if (!enc) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("missing encryption description"));
return NULL;
}
conn = virGetConnectSecret();
if (!conn)
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:
virObjectUnref(conn);
VIR_DISPOSE_N(secret, secretlen);
VIR_FORCE_CLOSE(fd);
return secretPath;
error:
unlink(secretPath);
VIR_FREE(secretPath);
goto cleanup;
}
static int
storageBackendCreateQemuImg(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 &&
vol->target.encryption->format == VIR_STORAGE_ENCRYPTION_FORMAT_LUKS) {
if (!(secretPath =
storageBackendCreateQemuImgSecretPath(pool, vol)))
goto cleanup;
}
cmd = virStorageBackendCreateQemuImgCmdFromVol(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;
}
/**
* virStorageBackendCreateVolUsingQemuImg
* @pool: Storage Pool Object
* @vol: Volume definition
* @inputvol: Volume to use for creation
* @flags: Flags for creation options
*
* A shim to storageBackendCreateQemuImg to allow other backends to
* utilize qemu-img processing in order to create or alter the volume.
*
* NB: If a volume target format is not supplied (per usual for some
* backends), temporarily adjust the format to be RAW. Once completed,
* reset the format back to NONE.
*
* Returns: 0 on success, -1 on failure.
*/
int
virStorageBackendCreateVolUsingQemuImg(virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
unsigned int flags)
{
int ret = -1;
bool changeFormat = false;
if (vol->target.format == VIR_STORAGE_FILE_NONE) {
vol->target.format = VIR_STORAGE_FILE_RAW;
changeFormat = true;
}
ret = storageBackendCreateQemuImg(pool, vol, inputvol, flags);
if (changeFormat)
vol->target.format = VIR_STORAGE_FILE_NONE;
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 storageBackendCreateQemuImg;
}
if (vol->type == VIR_STORAGE_VOL_PLOOP)
return storageBackendCreatePloop;
if (vol->type == VIR_STORAGE_VOL_BLOCK)
return storageBackendCreateBlockFrom;
else
return storageBackendCreateRaw;
}
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.
*/
static bool
storageBackendIsPloopDir(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.
*/
static int
storageBackendRedoPloopUpdate(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;
}
/*
* storageBackendUpdateVolTargetInfo
* @voltype: Volume type
* @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.
*/
static int
storageBackendUpdateVolTargetInfo(virStorageVolType voltype,
virStorageSourcePtr target,
bool withBlockVolFormat,
unsigned int openflags,
unsigned int readflags)
{
int ret, fd = -1;
struct stat sb;
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 ((voltype == VIR_STORAGE_VOL_FILE || voltype == VIR_STORAGE_VOL_BLOCK) &&
target->format != VIR_STORAGE_FILE_NONE) {
if (S_ISDIR(sb.st_mode)) {
if (storageBackendIsPloopDir(target->path)) {
if ((ret = storageBackendRedoPloopUpdate(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 (virStorageSourceUpdateCapacity(target, buf, len, false) < 0) {
ret = -1;
goto cleanup;
}
}
if (withBlockVolFormat) {
if ((ret = virStorageBackendDetectBlockVolFormatFD(target, fd,
readflags)) < 0)
goto cleanup;
}
cleanup:
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 = storageBackendUpdateVolTargetInfo(vol->type,
&vol->target,
withBlockVolFormat,
openflags, readflags)) < 0)
return ret;
if (virStorageSourceHasBacking(&vol->target) &&
(ret = storageBackendUpdateVolTargetInfo(VIR_STORAGE_VOL_FILE,
vol->target.backingStore,
withBlockVolFormat,
VIR_STORAGE_VOL_OPEN_DEFAULT |
VIR_STORAGE_VOL_OPEN_NOERROR,
readflags)) == -1)
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 (virStorageSourceUpdateBackingSizes(target, fd, sb) < 0)
return -1;
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);
target->type = VIR_STORAGE_TYPE_FILE;
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 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)
{
virStoragePoolDefPtr def = virStoragePoolObjGetDef(pool);
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 (def->type == VIR_STORAGE_POOL_LOGICAL ||
!virStorageBackendPoolPathIsStable(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, def->target.path) < 0) {
opentries++;
if (loop && errno == ENOENT && opentries < 50) {
usleep(100 * 1000);
goto reopen;
}
virReportSystemError(errno,
_("cannot read dir '%s'"),
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",
def->target.path, dent->d_name) < 0) {
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;
}
/* Common/Local File System/Directory Volume API's */
static int
createFileDir(virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
unsigned int flags)
{
virStoragePoolDefPtr def = virStoragePoolObjGetDef(pool);
int err;
virCheckFlags(0, -1);
if (inputvol) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s",
_("cannot copy from volume to a directory volume"));
return -1;
}
if (virStorageSourceHasBacking(&vol->target)) {
virReportError(VIR_ERR_NO_SUPPORT, "%s",
_("backing storage not supported for directories volumes"));
return -1;
}
if ((err = 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,
(def->type == VIR_STORAGE_POOL_NETFS
? VIR_DIR_CREATE_AS_UID : 0))) < 0) {
return -1;
}
return 0;
}
/**
* Set up a volume definition to be added to a pool's volume list, but
* don't do any file creation or allocation. By separating the two processes,
* we allow allocation progress reporting (by polling the volume's 'info'
* function), and can drop the parent pool lock during the (slow) allocation.
*/
int
virStorageBackendVolCreateLocal(virStoragePoolObjPtr pool,
virStorageVolDefPtr vol)
{
virStoragePoolDefPtr def = virStoragePoolObjGetDef(pool);
if (vol->target.format == VIR_STORAGE_FILE_DIR)
vol->type = VIR_STORAGE_VOL_DIR;
else if (vol->target.format == VIR_STORAGE_FILE_PLOOP)
vol->type = VIR_STORAGE_VOL_PLOOP;
else
vol->type = VIR_STORAGE_VOL_FILE;
/* Volumes within a directory pools are not recursive; do not
* allow escape to ../ or a subdir */
if (strchr(vol->name, '/')) {
virReportError(VIR_ERR_OPERATION_INVALID,
_("volume name '%s' cannot contain '/'"), vol->name);
return -1;
}
VIR_FREE(vol->target.path);
if (virAsprintf(&vol->target.path, "%s/%s",
def->target.path, vol->name) < 0)
return -1;
if (virFileExists(vol->target.path)) {
virReportError(VIR_ERR_OPERATION_INVALID,
_("volume target path '%s' already exists"),
vol->target.path);
return -1;
}
VIR_FREE(vol->key);
return VIR_STRDUP(vol->key, vol->target.path);
}
static int
storageBackendVolBuildLocal(virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
unsigned int flags)
{
virStorageBackendBuildVolFrom create_func;
if (inputvol) {
if (vol->target.encryption != NULL) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
"%s", _("storage pool does not support "
"building encrypted volumes from "
"other volumes"));
return -1;
}
if (!(create_func =
virStorageBackendGetBuildVolFromFunction(vol, inputvol)))
return -1;
} else if (vol->target.format == VIR_STORAGE_FILE_RAW &&
vol->target.encryption == NULL) {
create_func = storageBackendCreateRaw;
} else if (vol->target.format == VIR_STORAGE_FILE_DIR) {
create_func = createFileDir;
} else if (vol->target.format == VIR_STORAGE_FILE_PLOOP) {
create_func = storageBackendCreatePloop;
} else {
create_func = storageBackendCreateQemuImg;
}
if (create_func(pool, vol, inputvol, flags) < 0)
return -1;
return 0;
}
/**
* Allocate a new file as a volume. This is either done directly
* for raw/sparse files, or by calling qemu-img for
* special kinds of files
*/
int
virStorageBackendVolBuildLocal(virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
unsigned int flags)
{
return storageBackendVolBuildLocal(pool, vol, NULL, flags);
}
/*
* Create a storage vol using 'inputvol' as input
*/
int
virStorageBackendVolBuildFromLocal(virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
unsigned int flags)
{
return storageBackendVolBuildLocal(pool, vol, inputvol, flags);
}
/**
* Remove a volume - no support for BLOCK and NETWORK yet
*/
int
virStorageBackendVolDeleteLocal(virStoragePoolObjPtr pool ATTRIBUTE_UNUSED,
virStorageVolDefPtr vol,
unsigned int flags)
{
virCheckFlags(0, -1);
switch ((virStorageVolType) vol->type) {
case VIR_STORAGE_VOL_FILE:
case VIR_STORAGE_VOL_DIR:
if (virFileRemove(vol->target.path, vol->target.perms->uid,
vol->target.perms->gid) < 0) {
/* Silently ignore failures where the vol has already gone away */
if (errno != ENOENT) {
if (vol->type == VIR_STORAGE_VOL_FILE)
virReportSystemError(errno,
_("cannot unlink file '%s'"),
vol->target.path);
else
virReportSystemError(errno,
_("cannot remove directory '%s'"),
vol->target.path);
return -1;
}
}
break;
case VIR_STORAGE_VOL_PLOOP:
if (virFileDeleteTree(vol->target.path) < 0)
return -1;
break;
case VIR_STORAGE_VOL_BLOCK:
case VIR_STORAGE_VOL_NETWORK:
case VIR_STORAGE_VOL_NETDIR:
case VIR_STORAGE_VOL_LAST:
virReportError(VIR_ERR_NO_SUPPORT,
_("removing block or network volumes is not supported: %s"),
vol->target.path);
return -1;
}
return 0;
}
/* storageBackendLoadDefaultSecrets:
* @vol: volume being refreshed
*
* If the volume had a secret generated, we need to regenerate the
* encryption secret information
*
* Returns 0 if no secret or secret setup was successful,
* -1 on failures w/ error message set
*/
static int
storageBackendLoadDefaultSecrets(virStorageVolDefPtr vol)
{
virSecretPtr sec;
virStorageEncryptionSecretPtr encsec = NULL;
virConnectPtr conn = NULL;
if (!vol->target.encryption || vol->target.encryption->nsecrets != 0)
return 0;
conn = virGetConnectSecret();
if (!conn)
return -1;
/* The encryption secret for qcow2 and luks volumes use the path
* to the volume, so look for a secret with the path. If not found,
* then we cannot generate the secret after a refresh (or restart).
* This may be the case if someone didn't follow instructions and created
* a usage string that although matched with the secret usage string,
* didn't contain the path to the volume. We won't error in that case,
* but we also cannot find the secret. */
sec = virSecretLookupByUsage(conn, VIR_SECRET_USAGE_TYPE_VOLUME,
vol->target.path);
virObjectUnref(conn);
if (!sec)
return 0;
if (VIR_ALLOC_N(vol->target.encryption->secrets, 1) < 0 ||
VIR_ALLOC(encsec) < 0) {
VIR_FREE(vol->target.encryption->secrets);
virObjectUnref(sec);
return -1;
}
vol->target.encryption->nsecrets = 1;
vol->target.encryption->secrets[0] = encsec;
encsec->type = VIR_STORAGE_ENCRYPTION_SECRET_TYPE_PASSPHRASE;
encsec->seclookupdef.type = VIR_SECRET_LOOKUP_TYPE_UUID;
virSecretGetUUID(sec, encsec->seclookupdef.u.uuid);
virObjectUnref(sec);
return 0;
}
/**
* Update info about a volume's capacity/allocation
*/
int
virStorageBackendVolRefreshLocal(virStoragePoolObjPtr pool ATTRIBUTE_UNUSED,
virStorageVolDefPtr vol)
{
int ret;
/* Refresh allocation / capacity / permissions info in case its changed */
if ((ret = virStorageBackendUpdateVolInfo(vol, false,
VIR_STORAGE_VOL_FS_OPEN_FLAGS,
0)) < 0)
return ret;
/* Load any secrets if possible */
return storageBackendLoadDefaultSecrets(vol);
}
static int
storageBackendResizeQemuImg(virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
unsigned long long capacity)
{
int ret = -1;
char *img_tool = NULL;
virCommandPtr cmd = NULL;
const char *type;
char *secretPath = NULL;
char *secretAlias = NULL;
img_tool = virFindFileInPath("qemu-img");
if (!img_tool) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("unable to find qemu-img"));
return -1;
}
if (vol->target.encryption) {
if (vol->target.format == VIR_STORAGE_FILE_RAW)
type = "luks";
else
type = virStorageFileFormatTypeToString(vol->target.format);
storageBackendLoadDefaultSecrets(vol);
if (storageBackendCreateQemuImgCheckEncryption(vol->target.format,
type, vol) < 0)
goto cleanup;
if (!(secretPath =
storageBackendCreateQemuImgSecretPath(pool, vol)))
goto cleanup;
if (virAsprintf(&secretAlias, "%s_luks0", vol->name) < 0)
goto cleanup;
}
/* Round capacity as qemu-img resize errors out on sizes which are not
* a multiple of 512 */
capacity = VIR_ROUND_UP(capacity, 512);
cmd = virCommandNew(img_tool);
if (!vol->target.encryption) {
virCommandAddArgList(cmd, "resize", vol->target.path, NULL);
} else {
virCommandAddArg(cmd, "resize");
if (storageBackendCreateQemuImgSecretObject(cmd, secretPath,
secretAlias) < 0)
goto cleanup;
if (storageBackendResizeQemuImgImageOpts(cmd, vol->target.path,
secretAlias) < 0)
goto cleanup;
}
virCommandAddArgFormat(cmd, "%llu", capacity);
ret = virCommandRun(cmd, NULL);
cleanup:
VIR_FREE(img_tool);
if (secretPath) {
unlink(secretPath);
VIR_FREE(secretPath);
}
VIR_FREE(secretAlias);
virCommandFree(cmd);
return ret;
}
/**
* Resize a volume
*/
int
virStorageBackendVolResizeLocal(virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
unsigned long long capacity,
unsigned int flags)
{
bool pre_allocate = flags & VIR_STORAGE_VOL_RESIZE_ALLOCATE;
virCheckFlags(VIR_STORAGE_VOL_RESIZE_ALLOCATE |
VIR_STORAGE_VOL_RESIZE_SHRINK, -1);
if (vol->target.format == VIR_STORAGE_FILE_RAW && !vol->target.encryption) {
return virStorageFileResize(vol->target.path, capacity, pre_allocate);
} else if (vol->target.format == VIR_STORAGE_FILE_RAW && vol->target.encryption) {
if (pre_allocate) {
virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
_("preallocate is only supported for raw "
"type volume"));
return -1;
}
return storageBackendResizeQemuImg(pool, vol, capacity);
} else if (vol->target.format == VIR_STORAGE_FILE_PLOOP) {
return storagePloopResize(vol, capacity);
} else {
if (pre_allocate) {
virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
_("preallocate is only supported for raw "
"type volume"));
return -1;
}
return storageBackendResizeQemuImg(pool, vol, capacity);
}
}
/*
* Check whether the ploop image has snapshots.
* return: -1 - failed to check
* 0 - no snapshots
* 1 - at least one snapshot
*/
static int
storageBackendPloopHasSnapshots(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(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;
bool sparse = flags & VIR_STORAGE_VOL_UPLOAD_SPARSE_STREAM;
virCheckFlags(VIR_STORAGE_VOL_UPLOAD_SPARSE_STREAM, -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 = storageBackendPloopHasSnapshots(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, sparse, O_WRONLY);
cleanup:
VIR_FREE(path);
return ret;
}
int
virStorageBackendVolDownloadLocal(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;
bool sparse = flags & VIR_STORAGE_VOL_DOWNLOAD_SPARSE_STREAM;
virCheckFlags(VIR_STORAGE_VOL_DOWNLOAD_SPARSE_STREAM, -1);
if (vol->target.format == VIR_STORAGE_FILE_PLOOP) {
has_snap = storageBackendPloopHasSnapshots(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, sparse, 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
storageBackendVolZeroSparseFileLocal(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
storageBackendWipeLocal(const char *path,
int fd,
unsigned long long wipe_len,
size_t writebuf_length,
bool zero_end)
{
int ret = -1, written = 0;
unsigned long long remaining = 0;
off_t size;
size_t write_size = 0;
char *writebuf = NULL;
if (VIR_ALLOC_N(writebuf, writebuf_length) < 0)
goto cleanup;
if (!zero_end) {
if ((size = lseek(fd, 0, SEEK_SET)) < 0) {
virReportSystemError(errno,
_("Failed to seek to the start in volume "
"with path '%s'"),
path);
goto cleanup;
}
} else {
if ((size = lseek(fd, -wipe_len, SEEK_END)) < 0) {
virReportSystemError(errno,
_("Failed to seek to %llu bytes to the end "
"in volume with path '%s'"),
wipe_len, path);
goto cleanup;
}
}
VIR_DEBUG("wiping start: %zd len: %llu", (ssize_t) size, wipe_len);
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
storageBackendVolWipeLocalFile(const char *path,
unsigned int algorithm,
unsigned long long allocation,
bool zero_end)
{
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 = storageBackendVolZeroSparseFileLocal(path, st.st_size, fd);
} else {
ret = storageBackendWipeLocal(path, fd, allocation, st.st_blksize,
zero_end);
}
if (ret < 0)
goto cleanup;
}
cleanup:
virCommandFree(cmd);
VIR_FORCE_CLOSE(fd);
return ret;
}
static int
storageBackendVolWipePloop(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 (storageBackendVolWipeLocalFile(target_path, algorithm,
vol->target.allocation, false) < 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(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 = storageBackendVolWipePloop(vol, algorithm);
} else {
ret = storageBackendVolWipeLocalFile(vol->target.path, algorithm,
vol->target.allocation, false);
}
return ret;
}
/**
* @pool: storage pool to build
* @dir_create_flags: flags for directory creation
*
* Common code to build a directory based storage pool
*
* Returns 0 on success, -1 on failure
*/
int
virStorageBackendBuildLocal(virStoragePoolObjPtr pool)
{
virStoragePoolDefPtr def = virStoragePoolObjGetDef(pool);
int ret = -1;
char *parent = NULL;
char *p = NULL;
mode_t mode;
bool needs_create_as_uid;
unsigned int dir_create_flags;
if (VIR_STRDUP(parent, def->target.path) < 0)
goto cleanup;
if (!(p = strrchr(parent, '/'))) {
virReportError(VIR_ERR_INVALID_ARG,
_("path '%s' is not absolute"),
def->target.path);
goto cleanup;
}
if (p != parent) {
/* assure all directories in the path prior to the final dir
* exist, with default uid/gid/mode. */
*p = '\0';
if (virFileMakePath(parent) < 0) {
virReportSystemError(errno, _("cannot create path '%s'"),
parent);
goto cleanup;
}
}
dir_create_flags = VIR_DIR_CREATE_ALLOW_EXIST;
needs_create_as_uid = (def->type == VIR_STORAGE_POOL_NETFS);
mode = def->target.perms.mode;
if (mode == (mode_t) -1 &&
(needs_create_as_uid || !virFileExists(def->target.path)))
mode = VIR_STORAGE_DEFAULT_POOL_PERM_MODE;
if (needs_create_as_uid)
dir_create_flags |= VIR_DIR_CREATE_AS_UID;
/* Now create the final dir in the path with the uid/gid/mode
* requested in the config. If the dir already exists, just set
* the perms. */
if (virDirCreate(def->target.path,
mode,
def->target.perms.uid,
def->target.perms.gid,
dir_create_flags) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(parent);
return ret;
}
/**
* @conn connection to report errors against
* @pool storage pool to delete
*
* Delete a directory based storage pool
*
* Returns 0 on success, -1 on error
*/
int
virStorageBackendDeleteLocal(virStoragePoolObjPtr pool,
unsigned int flags)
{
virStoragePoolDefPtr def = virStoragePoolObjGetDef(pool);
virCheckFlags(0, -1);
/* XXX delete all vols first ? */
if (rmdir(def->target.path) < 0) {
virReportSystemError(errno,
_("failed to remove pool '%s'"),
def->target.path);
return -1;
}
return 0;
}
int
virStorageUtilGlusterExtractPoolSources(const char *host,
const char *xml,
virStoragePoolSourceListPtr list,
virStoragePoolType pooltype)
{
xmlDocPtr doc = NULL;
xmlXPathContextPtr ctxt = NULL;
xmlNodePtr *nodes = NULL;
virStoragePoolSource *src = NULL;
char *volname = NULL;
size_t i;
int nnodes;
int ret = -1;
if (!(doc = virXMLParseStringCtxt(xml, _("(gluster_cli_output)"), &ctxt)))
goto cleanup;
if ((nnodes = virXPathNodeSet("//volumes/volume", ctxt, &nodes)) < 0)
goto cleanup;
for (i = 0; i < nnodes; i++) {
ctxt->node = nodes[i];
if (!(src = virStoragePoolSourceListNewSource(list)))
goto cleanup;
if (!(volname = virXPathString("string(./name)", ctxt))) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("failed to extract gluster volume name"));
goto cleanup;
}
if (pooltype == VIR_STORAGE_POOL_NETFS) {
src->format = VIR_STORAGE_POOL_NETFS_GLUSTERFS;
VIR_STEAL_PTR(src->dir, volname);
} else if (pooltype == VIR_STORAGE_POOL_GLUSTER) {
if (VIR_STRDUP(src->dir, "/") < 0)
goto cleanup;
VIR_STEAL_PTR(src->name, volname);
} else {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("unsupported gluster lookup"));
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;
}
ret = nnodes;
cleanup:
VIR_FREE(volname);
VIR_FREE(nodes);
xmlXPathFreeContext(ctxt);
xmlFreeDoc(doc);
return ret;
}
/**
* virStorageBackendFindGlusterPoolSources:
* @host: host to detect volumes on
* @pooltype: type of the pool
* @list: list of storage pool sources to be filled
* @report: report error if the 'gluster' cli tool is missing
*
* Looks up gluster volumes on @host and fills them to @list.
*
* @pooltype allows to influence the specific differences between netfs and
* native gluster pools. Users should pass only VIR_STORAGE_POOL_NETFS or
* VIR_STORAGE_POOL_GLUSTER.
*
* Returns number of volumes on the host on success, or -1 on error.
*/
int
virStorageBackendFindGlusterPoolSources(const char *host,
virStoragePoolType pooltype,
virStoragePoolSourceListPtr list,
bool report)
{
char *glusterpath = NULL;
char *outbuf = NULL;
virCommandPtr cmd = NULL;
int rc;
int ret = -1;
if (!(glusterpath = virFindFileInPath("gluster"))) {
if (report) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("'gluster' command line tool not found"));
return -1;
} else {
return 0;
}
}
cmd = virCommandNewArgList(glusterpath,
"--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) {
ret = 0;
goto cleanup;
}
ret = virStorageUtilGlusterExtractPoolSources(host, outbuf, list, pooltype);
cleanup:
VIR_FREE(outbuf);
virCommandFree(cmd);
VIR_FREE(glusterpath);
return ret;
}
#if WITH_BLKID
typedef enum {
VIR_STORAGE_BLKID_PROBE_ERROR = -1,
VIR_STORAGE_BLKID_PROBE_UNDEFINED, /* Nothing found */
VIR_STORAGE_BLKID_PROBE_UNKNOWN, /* Don't know libvirt fs/part type */
VIR_STORAGE_BLKID_PROBE_MATCH, /* Matches the on disk format */
VIR_STORAGE_BLKID_PROBE_DIFFERENT, /* Format doesn't match on disk format */
} virStorageBackendBLKIDProbeResult;
/*
* Utility function to probe for a file system on the device using the
* blkid "superblock" (e.g. default) APIs.
*
* NB: In general this helper will handle the virStoragePoolFormatFileSystem
* format types; however, if called from the Disk path, the initial fstype
* check will fail forcing the usage of the ProbePart helper.
*
* Returns virStorageBackendBLKIDProbeResult enum
*/
static virStorageBackendBLKIDProbeResult
virStorageBackendBLKIDFindFS(blkid_probe probe,
const char *device,
const char *format)
{
const char *fstype = NULL;
/* Make sure we're doing a superblock probe from the start */
blkid_probe_enable_superblocks(probe, true);
blkid_probe_reset_superblocks_filter(probe);
if (blkid_do_probe(probe) != 0) {
VIR_INFO("No filesystem found on device '%s'", device);
return VIR_STORAGE_BLKID_PROBE_UNDEFINED;
}
if (blkid_probe_lookup_value(probe, "TYPE", &fstype, NULL) == 0) {
if (STREQ(fstype, format))
return VIR_STORAGE_BLKID_PROBE_MATCH;
return VIR_STORAGE_BLKID_PROBE_DIFFERENT;
}
if (blkid_known_fstype(format) == 0)
return VIR_STORAGE_BLKID_PROBE_UNKNOWN;
return VIR_STORAGE_BLKID_PROBE_ERROR;
}
/*
* Utility function to probe for a partition on the device using the
* blkid "partitions" APIs.
*
* NB: In general, this API will be validating the virStoragePoolFormatDisk
* format types.
*
* Returns virStorageBackendBLKIDProbeResult enum
*/
static virStorageBackendBLKIDProbeResult
virStorageBackendBLKIDFindPart(blkid_probe probe,
const char *device,
const char *format)
{
const char *pttype = NULL;
/* A blkid_known_pttype on "dvh" and "pc98" returns a failure;
* however, the blkid_do_probe for "dvh" returns "sgi" and
* for "pc98" it returns "dos". Although "bsd" is recognized,
* it seems that the parted created partition table is not being
* properly recogized. Since each of these will cause problems
* with startup comparison, let's just treat them as UNKNOWN causing
* the caller to fallback to using PARTED */
if (STREQ(format, "dvh") || STREQ(format, "pc98") || STREQ(format, "bsd"))
return VIR_STORAGE_BLKID_PROBE_UNKNOWN;
/* Make sure we're doing a partitions probe from the start */
blkid_probe_enable_partitions(probe, true);
blkid_probe_reset_partitions_filter(probe);
if (blkid_do_probe(probe) != 0) {
VIR_INFO("No partition found on device '%s'", device);
return VIR_STORAGE_BLKID_PROBE_UNDEFINED;
}
if (blkid_probe_lookup_value(probe, "PTTYPE", &pttype, NULL) == 0) {
if (STREQ(pttype, format))
return VIR_STORAGE_BLKID_PROBE_MATCH;
return VIR_STORAGE_BLKID_PROBE_DIFFERENT;
}
if (blkid_known_pttype(format) == 0)
return VIR_STORAGE_BLKID_PROBE_UNKNOWN;
return VIR_STORAGE_BLKID_PROBE_ERROR;
}
/*
* @device: Path to device
* @format: Desired format
* @writelabel: True if desire to write the label
*
* Use the blkid_ APIs in order to get details regarding whether a file
* system or partition exists on the disk already.
*
* Returns:
* -2: Force usage of PARTED for unknown types
* -1: An error was encountered, with error message set
* 0: No file system found
*/
static int
virStorageBackendBLKIDFindEmpty(const char *device,
const char *format,
bool writelabel)
{
int ret = -1;
int rc;
blkid_probe probe = NULL;
VIR_DEBUG("Probe for existing filesystem/partition format %s on device %s",
format, device);
if (!(probe = blkid_new_probe_from_filename(device))) {
virReportError(VIR_ERR_STORAGE_PROBE_FAILED,
_("Failed to create filesystem probe for device %s"),
device);
return -1;
}
/* Look for something on FS, if it either doesn't recognize the
* format type as a valid FS format type or it doesn't find a valid
* format type on the device, then perform the same check using
* partition probing. */
rc = virStorageBackendBLKIDFindFS(probe, device, format);
if (rc == VIR_STORAGE_BLKID_PROBE_UNDEFINED ||
rc == VIR_STORAGE_BLKID_PROBE_UNKNOWN) {
rc = virStorageBackendBLKIDFindPart(probe, device, format);
}
switch (rc) {
case VIR_STORAGE_BLKID_PROBE_UNDEFINED:
if (writelabel)
ret = 0;
else
virReportError(VIR_ERR_STORAGE_PROBE_FAILED,
_("Device '%s' is unrecognized, requires build"),
device);
break;
case VIR_STORAGE_BLKID_PROBE_ERROR:
virReportError(VIR_ERR_STORAGE_PROBE_FAILED,
_("Failed to probe for format type '%s'"), format);
break;
case VIR_STORAGE_BLKID_PROBE_UNKNOWN:
ret = -2;
break;
case VIR_STORAGE_BLKID_PROBE_MATCH:
if (writelabel)
virReportError(VIR_ERR_STORAGE_POOL_BUILT,
_("Device '%s' already formatted using '%s'"),
device, format);
else
ret = 0;
break;
case VIR_STORAGE_BLKID_PROBE_DIFFERENT:
if (writelabel)
virReportError(VIR_ERR_STORAGE_POOL_BUILT,
_("Format of device '%s' does not match the "
"expected format '%s', forced overwrite is "
"necessary"),
device, format);
else
virReportError(VIR_ERR_OPERATION_INVALID,
_("Format of device '%s' does not match the "
"expected format '%s'"),
device, format);
break;
}
if (ret == 0 && blkid_do_probe(probe) != 1) {
virReportError(VIR_ERR_STORAGE_PROBE_FAILED, "%s",
_("Found additional probes to run, probing may "
"be incorrect"));
ret = -1;
}
blkid_free_probe(probe);
return ret;
}
#else /* #if WITH_BLKID */
static int
virStorageBackendBLKIDFindEmpty(const char *device ATTRIBUTE_UNUSED,
const char *format ATTRIBUTE_UNUSED,
bool writelabel ATTRIBUTE_UNUSED)
{
return -2;
}
#endif /* #if WITH_BLKID */
#if WITH_STORAGE_DISK
typedef enum {
VIR_STORAGE_PARTED_ERROR = -1,
VIR_STORAGE_PARTED_MATCH, /* Valid label found and matches format */
VIR_STORAGE_PARTED_DIFFERENT, /* Valid label found but not match format */
VIR_STORAGE_PARTED_UNKNOWN, /* No or unrecognized label */
VIR_STORAGE_PARTED_NOPTTYPE, /* Did not find the Partition Table type */
VIR_STORAGE_PARTED_PTTYPE_UNK, /* Partition Table type unknown*/
} virStorageBackendPARTEDResult;
/**
* Check for a valid disk label (partition table) on device using
* the PARTED command
*
* returns virStorageBackendPARTEDResult
*/
static virStorageBackendPARTEDResult
virStorageBackendPARTEDFindLabel(const char *device,
const char *format)
{
const char *const args[] = {
device, "print", "--script", NULL,
};
virCommandPtr cmd = virCommandNew(PARTED);
char *output = NULL;
char *error = NULL;
char *start, *end;
int ret = VIR_STORAGE_PARTED_ERROR;
virCommandAddArgSet(cmd, args);
virCommandAddEnvString(cmd, "LC_ALL=C");
virCommandSetOutputBuffer(cmd, &output);
virCommandSetErrorBuffer(cmd, &error);
/* if parted succeeds we have a valid partition table */
ret = virCommandRun(cmd, NULL);
if (ret < 0) {
if ((output && strstr(output, "unrecognised disk label")) ||
(error && strstr(error, "unrecognised disk label"))) {
ret = VIR_STORAGE_PARTED_UNKNOWN;
}
goto cleanup;
}
/* Search for "Partition Table:" in the output. If not present,
* then we cannot validate the partition table type.
*/
if (!(start = strstr(output, "Partition Table: ")) ||
!(end = strstr(start, "\n"))) {
VIR_DEBUG("Unable to find tag in output: %s", output);
ret = VIR_STORAGE_PARTED_NOPTTYPE;
goto cleanup;
}
start += strlen("Partition Table: ");
*end = '\0';
/* on disk it's "msdos", but we document/use "dos" so deal with it here */
if (STREQ(start, "msdos"))
start += 2;
/* Make sure we know about this type */
if (virStoragePoolFormatDiskTypeFromString(start) < 0) {
ret = VIR_STORAGE_PARTED_PTTYPE_UNK;
goto cleanup;
}
/* Does the on disk match what the pool desired? */
if (STREQ(start, format))
ret = VIR_STORAGE_PARTED_MATCH;
else
ret = VIR_STORAGE_PARTED_DIFFERENT;
cleanup:
virCommandFree(cmd);
VIR_FREE(output);
VIR_FREE(error);
return ret;
}
/**
* Determine whether the label on the disk is valid or in a known format
* for the purpose of rewriting the label during build or being able to
* start a pool on a device.
*
* When 'writelabel' is true, if we find a valid disk label on the device,
* then we shouldn't be attempting to write as the volume may contain
* data. Force the usage of the overwrite flag to the build command in
* order to be certain. When the disk label is unrecognized, then it
* should be safe to write.
*
* When 'writelabel' is false, only if we find a valid disk label on the
* device should we allow the start since for this path we won't be
* rewriting the label.
*
* Return: 0 if it's OK
* -1 if something's wrong
*/
static int
virStorageBackendPARTEDValidLabel(const char *device,
const char *format,
bool writelabel)
{
int ret = -1;
virStorageBackendPARTEDResult check;
check = virStorageBackendPARTEDFindLabel(device, format);
switch (check) {
case VIR_STORAGE_PARTED_ERROR:
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("Error checking for disk label, failed to get "
"disk partition information"));
break;
case VIR_STORAGE_PARTED_MATCH:
if (writelabel)
virReportError(VIR_ERR_OPERATION_INVALID,
_("Disk label already formatted using '%s'"),
format);
else
ret = 0;
break;
case VIR_STORAGE_PARTED_DIFFERENT:
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("Known, but different label format present, "
"requires build --overwrite"));
break;
case VIR_STORAGE_PARTED_UNKNOWN:
if (writelabel)
ret = 0;
else
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("Unrecognized disk label found, requires build"));
break;
case VIR_STORAGE_PARTED_NOPTTYPE:
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("Unable to determine Partition Type, "
"requires build --overwrite"));
break;
case VIR_STORAGE_PARTED_PTTYPE_UNK:
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("Unknown Partition Type, requires build --overwrite"));
break;
}
return ret;
}
#else
static int
virStorageBackendPARTEDValidLabel(const char *device ATTRIBUTE_UNUSED,
const char *format ATTRIBUTE_UNUSED,
bool writelabel ATTRIBUTE_UNUSED)
{
return -2;
}
#endif /* #if WITH_STORAGE_DISK */
/* virStorageBackendDeviceIsEmpty:
* @devpath: Path to the device to check
* @format: Desired format string
* @writelabel: True if the caller expects to write the label
*
* Check if the @devpath has some sort of known file system using the
* BLKID API if available.
*
* Returns true if the probe deems the device has nothing valid on it
* or when we cannot check and we're not writing the label.
*
* Returns false if the probe finds something
*/
bool
virStorageBackendDeviceIsEmpty(const char *devpath,
const char *format,
bool writelabel)
{
int ret;
if ((ret = virStorageBackendBLKIDFindEmpty(devpath, format,
writelabel)) == -2)
ret = virStorageBackendPARTEDValidLabel(devpath, format, writelabel);
if (ret == -2 && !writelabel)
ret = 0;
if (ret == -2) {
virReportError(VIR_ERR_OPERATION_INVALID,
_("Unable to probe '%s' for existing data, "
"forced overwrite is necessary"),
devpath);
}
return ret == 0;
}
static int
storageBackendProbeTarget(virStorageSourcePtr target,
virStorageEncryptionPtr *encryption)
{
int backingStoreFormat;
int fd = -1;
int ret = -1;
int rc;
virStorageSourcePtr meta = NULL;
struct stat sb;
if (encryption)
*encryption = NULL;
if ((rc = virStorageBackendVolOpen(target->path, &sb,
VIR_STORAGE_VOL_FS_PROBE_FLAGS)) < 0)
return rc; /* Take care to propagate rc, it is not always -1 */
fd = rc;
if (virStorageBackendUpdateVolTargetInfoFD(target, fd, &sb) < 0)
goto cleanup;
if (S_ISDIR(sb.st_mode)) {
if (storageBackendIsPloopDir(target->path)) {
if (storageBackendRedoPloopUpdate(target, &sb, &fd,
VIR_STORAGE_VOL_FS_PROBE_FLAGS) < 0)
goto cleanup;
} else {
target->format = VIR_STORAGE_FILE_DIR;
ret = 0;
goto cleanup;
}
}
if (!(meta = virStorageFileGetMetadataFromFD(target->path,
fd,
VIR_STORAGE_FILE_AUTO,
&backingStoreFormat)))
goto cleanup;
if (meta->backingStoreRaw) {
if (!(target->backingStore = virStorageSourceNewFromBacking(meta)))
goto cleanup;
target->backingStore->format = backingStoreFormat;
/* XXX: Remote storage doesn't play nicely with volumes backed by
* remote storage. To avoid trouble, just fake the backing store is RAW
* and put the string from the metadata as the path of the target. */
if (!virStorageSourceIsLocalStorage(target->backingStore)) {
virStorageSourceFree(target->backingStore);
if (VIR_ALLOC(target->backingStore) < 0)
goto cleanup;
target->backingStore->type = VIR_STORAGE_TYPE_NETWORK;
target->backingStore->path = meta->backingStoreRaw;
meta->backingStoreRaw = NULL;
target->backingStore->format = VIR_STORAGE_FILE_RAW;
}
if (target->backingStore->format == VIR_STORAGE_FILE_AUTO) {
if ((rc = virStorageFileProbeFormat(target->backingStore->path,
-1, -1)) < 0) {
/* If the backing file is currently unavailable or is
* accessed via remote protocol only log an error, fake the
* format as RAW and continue. Returning -1 here would
* disable the whole storage pool, making it unavailable for
* even maintenance. */
target->backingStore->format = VIR_STORAGE_FILE_RAW;
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot probe backing volume format: %s"),
target->backingStore->path);
} else {
target->backingStore->format = rc;
}
}
}
target->format = meta->format;
/* Default to success below this point */
ret = 0;
if (meta->capacity)
target->capacity = meta->capacity;
if (encryption && meta->encryption) {
if (meta->encryption->payload_offset != -1)
target->capacity -= meta->encryption->payload_offset * 512;
*encryption = meta->encryption;
meta->encryption = NULL;
/* XXX ideally we'd fill in secret UUID here
* but we cannot guarantee 'conn' is non-NULL
* at this point in time :-( So we only fill
* in secrets when someone first queries a vol
*/
}
virBitmapFree(target->features);
target->features = meta->features;
meta->features = NULL;
if (meta->compat) {
VIR_FREE(target->compat);
target->compat = meta->compat;
meta->compat = NULL;
}
cleanup:
VIR_FORCE_CLOSE(fd);
virStorageSourceFree(meta);
return ret;
}
/**
* virStorageBackendRefreshVolTargetUpdate:
* @vol: Volume def that needs updating
*
* Attempt to probe the volume in order to get more details.
*
* Returns 0 on success, -2 to ignore failure, -1 on failure
*/
int
virStorageBackendRefreshVolTargetUpdate(virStorageVolDefPtr vol)
{
int err;
/* Real value is filled in during probe */
vol->target.format = VIR_STORAGE_FILE_RAW;
if ((err = storageBackendProbeTarget(&vol->target,
&vol->target.encryption)) < 0) {
if (err == -2) {
return -2;
} else if (err == -3) {
/* The backing file is currently unavailable, its format is not
* explicitly specified, the probe to auto detect the format
* failed: continue with faked RAW format, since AUTO will
* break virStorageVolTargetDefFormat() generating the line
* <format type='...'/>. */
} else {
return -1;
}
}
/* directory based volume */
if (vol->target.format == VIR_STORAGE_FILE_DIR)
vol->type = VIR_STORAGE_VOL_DIR;
if (vol->target.format == VIR_STORAGE_FILE_PLOOP)
vol->type = VIR_STORAGE_VOL_PLOOP;
if (virStorageSourceHasBacking(&vol->target)) {
ignore_value(storageBackendUpdateVolTargetInfo(VIR_STORAGE_VOL_FILE,
vol->target.backingStore,
false,
VIR_STORAGE_VOL_OPEN_DEFAULT, 0));
/* If this failed, the backing file is currently unavailable,
* the capacity, allocation, owner, group and mode are unknown.
* An error message was raised, but we just continue. */
}
return 0;
}
/**
* Iterate over the pool's directory and enumerate all disk images
* within it. This is non-recursive.
*/
int
virStorageBackendRefreshLocal(virStoragePoolObjPtr pool)
{
virStoragePoolDefPtr def = virStoragePoolObjGetDef(pool);
DIR *dir;
struct dirent *ent;
struct statvfs sb;
struct stat statbuf;
virStorageVolDefPtr vol = NULL;
virStorageSourcePtr target = NULL;
int direrr;
int fd = -1, ret = -1;
if (virDirOpen(&dir, def->target.path) < 0)
goto cleanup;
while ((direrr = virDirRead(dir, &ent, def->target.path)) > 0) {
int err;
if (virStringHasControlChars(ent->d_name)) {
VIR_WARN("Ignoring file with control characters under '%s'",
def->target.path);
continue;
}
if (VIR_ALLOC(vol) < 0)
goto cleanup;
if (VIR_STRDUP(vol->name, ent->d_name) < 0)
goto cleanup;
vol->type = VIR_STORAGE_VOL_FILE;
if (virAsprintf(&vol->target.path, "%s/%s",
def->target.path, vol->name) < 0)
goto cleanup;
if (VIR_STRDUP(vol->key, vol->target.path) < 0)
goto cleanup;
if ((err = virStorageBackendRefreshVolTargetUpdate(vol)) < 0) {
if (err == -2) {
/* Silently ignore non-regular files,
* eg 'lost+found', dangling symbolic link */
virStorageVolDefFree(vol);
vol = NULL;
continue;
}
goto cleanup;
}
if (virStoragePoolObjAddVol(pool, vol) < 0)
goto cleanup;
vol = NULL;
}
if (direrr < 0)
goto cleanup;
VIR_DIR_CLOSE(dir);
if (VIR_ALLOC(target))
goto cleanup;
if ((fd = open(def->target.path, O_RDONLY)) < 0) {
virReportSystemError(errno,
_("cannot open path '%s'"),
def->target.path);
goto cleanup;
}
if (fstat(fd, &statbuf) < 0) {
virReportSystemError(errno,
_("cannot stat path '%s'"),
def->target.path);
goto cleanup;
}
if (virStorageBackendUpdateVolTargetInfoFD(target, fd, &statbuf) < 0)
goto cleanup;
/* VolTargetInfoFD doesn't update capacity correctly for the pool case */
if (statvfs(def->target.path, &sb) < 0) {
virReportSystemError(errno,
_("cannot statvfs path '%s'"),
def->target.path);
goto cleanup;
}
def->capacity = ((unsigned long long)sb.f_frsize *
(unsigned long long)sb.f_blocks);
def->available = ((unsigned long long)sb.f_bfree *
(unsigned long long)sb.f_frsize);
def->allocation = def->capacity - def->available;
def->target.perms.mode = target->perms->mode;
def->target.perms.uid = target->perms->uid;
def->target.perms.gid = target->perms->gid;
VIR_FREE(def->target.perms.label);
if (VIR_STRDUP(def->target.perms.label, target->perms->label) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_DIR_CLOSE(dir);
VIR_FORCE_CLOSE(fd);
virStorageVolDefFree(vol);
virStorageSourceFree(target);
if (ret < 0)
virStoragePoolObjClearVols(pool);
return ret;
}
static char *
virStorageBackendSCSISerial(const char *dev)
{
char *serial = NULL;
#ifdef WITH_UDEV
virCommandPtr cmd = virCommandNewArgList(
"/lib/udev/scsi_id",
"--replace-whitespace",
"--whitelisted",
"--device", dev,
NULL
);
/* Run the program and capture its output */
virCommandSetOutputBuffer(cmd, &serial);
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
#endif
if (serial && STRNEQ(serial, "")) {
char *nl = strchr(serial, '\n');
if (nl)
*nl = '\0';
} else {
VIR_FREE(serial);
ignore_value(VIR_STRDUP(serial, dev));
}
#ifdef WITH_UDEV
cleanup:
virCommandFree(cmd);
#endif
return serial;
}
/*
* Attempt to create a new LUN
*
* Returns:
*
* 0 => Success
* -1 => Failure due to some sort of OOM or other fatal issue found when
* attempting to get/update information about a found volume
* -2 => Failure to find a stable path, not fatal, caller can try another
*/
static int
virStorageBackendSCSINewLun(virStoragePoolObjPtr pool,
uint32_t host ATTRIBUTE_UNUSED,
uint32_t bus,
uint32_t target,
uint32_t lun,
const char *dev)
{
virStoragePoolDefPtr def = virStoragePoolObjGetDef(pool);
virStorageVolDefPtr vol = NULL;
char *devpath = NULL;
int retval = -1;
/* Check if the pool is using a stable target path. The call to
* virStorageBackendStablePath will fail if the pool target path
* isn't stable and just return the strdup'd 'devpath' anyway.
* This would be indistinguishable to failing to find the stable
* path to the device if the virDirRead loop to search the
* target pool path for our devpath had failed.
*/
if (!virStorageBackendPoolPathIsStable(def->target.path) &&
!(STREQ(def->target.path, "/dev") ||
STREQ(def->target.path, "/dev/"))) {
virReportError(VIR_ERR_INVALID_ARG,
_("unable to use target path '%s' for dev '%s'"),
NULLSTR(def->target.path), dev);
goto cleanup;
}
if (VIR_ALLOC(vol) < 0)
goto cleanup;
vol->type = VIR_STORAGE_VOL_BLOCK;
/* 'host' is dynamically allocated by the kernel, first come,
* first served, per HBA. As such it isn't suitable for use
* in the volume name. We only need uniqueness per-pool, so
* just leave 'host' out
*/
if (virAsprintf(&(vol->name), "unit:%u:%u:%u", bus, target, lun) < 0)
goto cleanup;
if (virAsprintf(&devpath, "/dev/%s", dev) < 0)
goto cleanup;
VIR_DEBUG("Trying to create volume for '%s'", devpath);
/* 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(pool,
devpath,
true)) == NULL)
goto cleanup;
if (STREQ(devpath, vol->target.path) &&
!(STREQ(def->target.path, "/dev") ||
STREQ(def->target.path, "/dev/"))) {
VIR_DEBUG("No stable path found for '%s' in '%s'",
devpath, def->target.path);
retval = -2;
goto cleanup;
}
/* Allow a volume read failure to ignore or skip this block file */
if ((retval = virStorageBackendUpdateVolInfo(vol, true,
VIR_STORAGE_VOL_OPEN_DEFAULT,
VIR_STORAGE_VOL_READ_NOERROR)) < 0)
goto cleanup;
if (!(vol->key = virStorageBackendSCSISerial(vol->target.path)))
goto cleanup;
def->capacity += vol->target.capacity;
def->allocation += vol->target.allocation;
if (virStoragePoolObjAddVol(pool, vol) < 0)
goto cleanup;
vol = NULL;
retval = 0;
cleanup:
virStorageVolDefFree(vol);
VIR_FREE(devpath);
return retval;
}
static int
getNewStyleBlockDevice(const char *lun_path,
const char *block_name ATTRIBUTE_UNUSED,
char **block_device)
{
char *block_path = NULL;
DIR *block_dir = NULL;
struct dirent *block_dirent = NULL;
int retval = -1;
int direrr;
if (virAsprintf(&block_path, "%s/block", lun_path) < 0)
goto cleanup;
VIR_DEBUG("Looking for block device in '%s'", block_path);
if (virDirOpen(&block_dir, block_path) < 0)
goto cleanup;
while ((direrr = virDirRead(block_dir, &block_dirent, block_path)) > 0) {
if (VIR_STRDUP(*block_device, block_dirent->d_name) < 0)
goto cleanup;
VIR_DEBUG("Block device is '%s'", *block_device);
break;
}
if (direrr < 0)
goto cleanup;
retval = 0;
cleanup:
VIR_DIR_CLOSE(block_dir);
VIR_FREE(block_path);
return retval;
}
static int
getOldStyleBlockDevice(const char *lun_path ATTRIBUTE_UNUSED,
const char *block_name,
char **block_device)
{
char *blockp = NULL;
int retval = -1;
/* old-style; just parse out the sd */
if (!(blockp = strrchr(block_name, ':'))) {
/* Hm, wasn't what we were expecting; have to give up */
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to parse block name %s"),
block_name);
goto cleanup;
} else {
blockp++;
if (VIR_STRDUP(*block_device, blockp) < 0)
goto cleanup;
VIR_DEBUG("Block device is '%s'", *block_device);
}
retval = 0;
cleanup:
return retval;
}
/*
* Search a device entry for the "block" file
*
* Returns
*
* 0 => Found it
* -1 => Fatal error
* -2 => Didn't find in lun_path directory
*/
static int
getBlockDevice(uint32_t host,
uint32_t bus,
uint32_t target,
uint32_t lun,
char **block_device)
{
char *lun_path = NULL;
DIR *lun_dir = NULL;
struct dirent *lun_dirent = NULL;
int retval = -1;
int direrr;
*block_device = NULL;
if (virAsprintf(&lun_path, "/sys/bus/scsi/devices/%u:%u:%u:%u",
host, bus, target, lun) < 0)
goto cleanup;
if (virDirOpen(&lun_dir, lun_path) < 0)
goto cleanup;
while ((direrr = virDirRead(lun_dir, &lun_dirent, lun_path)) > 0) {
if (STRPREFIX(lun_dirent->d_name, "block")) {
if (strlen(lun_dirent->d_name) == 5) {
if (getNewStyleBlockDevice(lun_path,
lun_dirent->d_name,
block_device) < 0)
goto cleanup;
} else {
if (getOldStyleBlockDevice(lun_path,
lun_dirent->d_name,
block_device) < 0)
goto cleanup;
}
break;
}
}
if (direrr < 0)
goto cleanup;
if (!*block_device) {
retval = -2;
goto cleanup;
}
retval = 0;
cleanup:
VIR_DIR_CLOSE(lun_dir);
VIR_FREE(lun_path);
return retval;
}
/* Function to check if the type file in the given sysfs_path is a
* Direct-Access device (i.e. type 0). Return -1 on failure, type of
* the device otherwise.
*/
static int
getDeviceType(uint32_t host,
uint32_t bus,
uint32_t target,
uint32_t lun,
int *type)
{
char *type_path = NULL;
char typestr[3];
char *gottype, *p;
FILE *typefile;
int retval = 0;
if (virAsprintf(&type_path, "/sys/bus/scsi/devices/%u:%u:%u:%u/type",
host, bus, target, lun) < 0)
goto out;
typefile = fopen(type_path, "r");
if (typefile == NULL) {
virReportSystemError(errno,
_("Could not find typefile '%s'"),
type_path);
/* there was no type file; that doesn't seem right */
retval = -1;
goto out;
}
gottype = fgets(typestr, 3, typefile);
VIR_FORCE_FCLOSE(typefile);
if (gottype == NULL) {
virReportSystemError(errno,
_("Could not read typefile '%s'"),
type_path);
/* we couldn't read the type file; have to give up */
retval = -1;
goto out;
}
/* we don't actually care about p, but if you pass NULL and the last
* character is not \0, virStrToLong_i complains
*/
if (virStrToLong_i(typestr, &p, 10, type) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Device type '%s' is not an integer"),
typestr);
/* Hm, type wasn't an integer; seems strange */
retval = -1;
goto out;
}
VIR_DEBUG("Device type is %d", *type);
out:
VIR_FREE(type_path);
return retval;
}
/*
* Process a Logical Unit entry from the scsi host device directory
*
* Returns:
*
* 0 => Found a valid entry
* -1 => Some sort of fatal error
* -2 => non-fatal error or a non-disk entry
*/
static int
processLU(virStoragePoolObjPtr pool,
uint32_t host,
uint32_t bus,
uint32_t target,
uint32_t lun)
{
int retval = -1;
int device_type;
char *block_device = NULL;
VIR_DEBUG("Processing LU %u:%u:%u:%u",
host, bus, target, lun);
if (getDeviceType(host, bus, target, lun, &device_type) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to determine if %u:%u:%u:%u is a Direct-Access LUN"),
host, bus, target, lun);
return -1;
}
/* We don't create volumes for devices other than disk and cdrom
* devices, but finding a device that isn't one of those types
* isn't an error, either. */
if (!(device_type == VIR_STORAGE_DEVICE_TYPE_DISK ||
device_type == VIR_STORAGE_DEVICE_TYPE_ROM))
return -2;
VIR_DEBUG("%u:%u:%u:%u is a Direct-Access LUN",
host, bus, target, lun);
if ((retval = getBlockDevice(host, bus, target, lun, &block_device)) < 0) {
VIR_DEBUG("Failed to find block device for this LUN");
return retval;
}
retval = virStorageBackendSCSINewLun(pool, host, bus, target, lun,
block_device);
if (retval < 0) {
VIR_DEBUG("Failed to create new storage volume for %u:%u:%u:%u",
host, bus, target, lun);
goto cleanup;
}
VIR_DEBUG("Created new storage volume for %u:%u:%u:%u successfully",
host, bus, target, lun);
cleanup:
VIR_FREE(block_device);
return retval;
}
int
virStorageBackendSCSIFindLUs(virStoragePoolObjPtr pool,
uint32_t scanhost)
{
virStoragePoolDefPtr def = virStoragePoolObjGetDef(pool);
int retval = 0;
uint32_t bus, target, lun;
const char *device_path = "/sys/bus/scsi/devices";
DIR *devicedir = NULL;
struct dirent *lun_dirent = NULL;
char devicepattern[64];
int found = 0;
VIR_DEBUG("Discovering LUs on host %u", scanhost);
virWaitForDevices();
if (virDirOpen(&devicedir, device_path) < 0)
return -1;
snprintf(devicepattern, sizeof(devicepattern), "%u:%%u:%%u:%%u\n", scanhost);
while ((retval = virDirRead(devicedir, &lun_dirent, device_path)) > 0) {
int rc;
if (sscanf(lun_dirent->d_name, devicepattern,
&bus, &target, &lun) != 3) {
continue;
}
VIR_DEBUG("Found possible LU '%s'", lun_dirent->d_name);
rc = processLU(pool, scanhost, bus, target, lun);
if (rc == -1) {
retval = -1;
break;
}
if (rc == 0)
found++;
}
VIR_DIR_CLOSE(devicedir);
if (retval < 0)
return -1;
VIR_DEBUG("Found %d LUs for pool %s", found, def->name);
return found;
}
/*
* @path: Path to the device to initialize
* @size: Size to be cleared
*
* Zero out possible partition table information for the specified
* bytes from the start of the @path and from the end of @path
*
* Returns 0 on success, -1 on failure with error message set
*/
int
virStorageBackendZeroPartitionTable(const char *path,
unsigned long long size)
{
if (storageBackendVolWipeLocalFile(path, VIR_STORAGE_VOL_WIPE_ALG_ZERO,
size, false) < 0)
return -1;
return storageBackendVolWipeLocalFile(path, VIR_STORAGE_VOL_WIPE_ALG_ZERO,
size, true);
}
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