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FRET-qemu/qga/commands-linux.c
Dehan Meng 5ab1c032e6 qemu-ga: Avoiding freeing line prematurely 
It's now only freed at the end of the function.

Signed-off-by: Dehan Meng <demeng@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com>
Message-ID: <20241107102155.57573-4-kkostiuk@redhat.com>
Signed-off-by: Konstantin Kostiuk <kkostiuk@redhat.com>
2024-11-07 12:28:20 +02:00

2220 lines
66 KiB
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/*
* QEMU Guest Agent Linux-specific command implementations
*
* Copyright IBM Corp. 2011
*
* Authors:
* Michael Roth <mdroth@linux.vnet.ibm.com>
* Michal Privoznik <mprivozn@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qga-qapi-commands.h"
#include "qapi/error.h"
#include "commands-common.h"
#include "cutils.h"
#include <mntent.h>
#include <sys/ioctl.h>
#include <mntent.h>
#include <linux/nvme_ioctl.h>
#include "block/nvme.h"
#ifdef CONFIG_LIBUDEV
#include <libudev.h>
#endif
#ifdef HAVE_GETIFADDRS
#include <net/if.h>
#endif
#include <sys/statvfs.h>
#if defined(CONFIG_FSFREEZE) || defined(CONFIG_FSTRIM)
static int dev_major_minor(const char *devpath,
unsigned int *devmajor, unsigned int *devminor)
{
struct stat st;
*devmajor = 0;
*devminor = 0;
if (stat(devpath, &st) < 0) {
slog("failed to stat device file '%s': %s", devpath, strerror(errno));
return -1;
}
if (S_ISDIR(st.st_mode)) {
/* It is bind mount */
return -2;
}
if (S_ISBLK(st.st_mode)) {
*devmajor = major(st.st_rdev);
*devminor = minor(st.st_rdev);
return 0;
}
return -1;
}
static bool build_fs_mount_list_from_mtab(FsMountList *mounts, Error **errp)
{
struct mntent *ment;
FsMount *mount;
char const *mtab = "/proc/self/mounts";
FILE *fp;
unsigned int devmajor, devminor;
fp = setmntent(mtab, "r");
if (!fp) {
error_setg(errp, "failed to open mtab file: '%s'", mtab);
return false;
}
while ((ment = getmntent(fp))) {
/*
* An entry which device name doesn't start with a '/' is
* either a dummy file system or a network file system.
* Add special handling for smbfs and cifs as is done by
* coreutils as well.
*/
if ((ment->mnt_fsname[0] != '/') ||
(strcmp(ment->mnt_type, "smbfs") == 0) ||
(strcmp(ment->mnt_type, "cifs") == 0)) {
continue;
}
if (dev_major_minor(ment->mnt_fsname, &devmajor, &devminor) == -2) {
/* Skip bind mounts */
continue;
}
mount = g_new0(FsMount, 1);
mount->dirname = g_strdup(ment->mnt_dir);
mount->devtype = g_strdup(ment->mnt_type);
mount->devmajor = devmajor;
mount->devminor = devminor;
QTAILQ_INSERT_TAIL(mounts, mount, next);
}
endmntent(fp);
return true;
}
static void decode_mntname(char *name, int len)
{
int i, j = 0;
for (i = 0; i <= len; i++) {
if (name[i] != '\\') {
name[j++] = name[i];
} else if (name[i + 1] == '\\') {
name[j++] = '\\';
i++;
} else if (name[i + 1] >= '0' && name[i + 1] <= '3' &&
name[i + 2] >= '0' && name[i + 2] <= '7' &&
name[i + 3] >= '0' && name[i + 3] <= '7') {
name[j++] = (name[i + 1] - '0') * 64 +
(name[i + 2] - '0') * 8 +
(name[i + 3] - '0');
i += 3;
} else {
name[j++] = name[i];
}
}
}
/*
* Walk the mount table and build a list of local file systems
*/
bool build_fs_mount_list(FsMountList *mounts, Error **errp)
{
FsMount *mount;
char const *mountinfo = "/proc/self/mountinfo";
FILE *fp;
char *line = NULL, *dash;
size_t n;
char check;
unsigned int devmajor, devminor;
int ret, dir_s, dir_e, type_s, type_e, dev_s, dev_e;
fp = fopen(mountinfo, "r");
if (!fp) {
return build_fs_mount_list_from_mtab(mounts, errp);
}
while (getline(&line, &n, fp) != -1) {
ret = sscanf(line, "%*u %*u %u:%u %*s %n%*s%n%c",
&devmajor, &devminor, &dir_s, &dir_e, &check);
if (ret < 3) {
continue;
}
dash = strstr(line + dir_e, " - ");
if (!dash) {
continue;
}
ret = sscanf(dash, " - %n%*s%n %n%*s%n%c",
&type_s, &type_e, &dev_s, &dev_e, &check);
if (ret < 1) {
continue;
}
line[dir_e] = 0;
dash[type_e] = 0;
dash[dev_e] = 0;
decode_mntname(line + dir_s, dir_e - dir_s);
decode_mntname(dash + dev_s, dev_e - dev_s);
if (devmajor == 0) {
/* btrfs reports major number = 0 */
if (strcmp("btrfs", dash + type_s) != 0 ||
dev_major_minor(dash + dev_s, &devmajor, &devminor) < 0) {
continue;
}
}
mount = g_new0(FsMount, 1);
mount->dirname = g_strdup(line + dir_s);
mount->devtype = g_strdup(dash + type_s);
mount->devmajor = devmajor;
mount->devminor = devminor;
QTAILQ_INSERT_TAIL(mounts, mount, next);
}
free(line);
fclose(fp);
return true;
}
#endif /* CONFIG_FSFREEZE || CONFIG_FSTRIM */
#ifdef CONFIG_FSFREEZE
/*
* Walk list of mounted file systems in the guest, and freeze the ones which
* are real local file systems.
*/
int64_t qmp_guest_fsfreeze_do_freeze_list(bool has_mountpoints,
strList *mountpoints,
FsMountList mounts,
Error **errp)
{
struct FsMount *mount;
strList *list;
int fd, ret, i = 0;
QTAILQ_FOREACH_REVERSE(mount, &mounts, next) {
/* To issue fsfreeze in the reverse order of mounts, check if the
* mount is listed in the list here */
if (has_mountpoints) {
for (list = mountpoints; list; list = list->next) {
if (strcmp(list->value, mount->dirname) == 0) {
break;
}
}
if (!list) {
continue;
}
}
fd = qga_open_cloexec(mount->dirname, O_RDONLY, 0);
if (fd == -1) {
error_setg_errno(errp, errno, "failed to open %s", mount->dirname);
return -1;
}
/* we try to cull filesystems we know won't work in advance, but other
* filesystems may not implement fsfreeze for less obvious reasons.
* these will report EOPNOTSUPP. we simply ignore these when tallying
* the number of frozen filesystems.
* if a filesystem is mounted more than once (aka bind mount) a
* consecutive attempt to freeze an already frozen filesystem will
* return EBUSY.
*
* any other error means a failure to freeze a filesystem we
* expect to be freezable, so return an error in those cases
* and return system to thawed state.
*/
ret = ioctl(fd, FIFREEZE);
if (ret == -1) {
if (errno != EOPNOTSUPP && errno != EBUSY) {
error_setg_errno(errp, errno, "failed to freeze %s",
mount->dirname);
close(fd);
return -1;
}
} else {
i++;
}
close(fd);
}
return i;
}
int qmp_guest_fsfreeze_do_thaw(Error **errp)
{
int ret;
FsMountList mounts;
FsMount *mount;
int fd, i = 0, logged;
Error *local_err = NULL;
QTAILQ_INIT(&mounts);
if (!build_fs_mount_list(&mounts, &local_err)) {
error_propagate(errp, local_err);
return -1;
}
QTAILQ_FOREACH(mount, &mounts, next) {
logged = false;
fd = qga_open_cloexec(mount->dirname, O_RDONLY, 0);
if (fd == -1) {
continue;
}
/* we have no way of knowing whether a filesystem was actually unfrozen
* as a result of a successful call to FITHAW, only that if an error
* was returned the filesystem was *not* unfrozen by that particular
* call.
*
* since multiple preceding FIFREEZEs require multiple calls to FITHAW
* to unfreeze, continuing issuing FITHAW until an error is returned,
* in which case either the filesystem is in an unfreezable state, or,
* more likely, it was thawed previously (and remains so afterward).
*
* also, since the most recent successful call is the one that did
* the actual unfreeze, we can use this to provide an accurate count
* of the number of filesystems unfrozen by guest-fsfreeze-thaw, which
* may * be useful for determining whether a filesystem was unfrozen
* during the freeze/thaw phase by a process other than qemu-ga.
*/
do {
ret = ioctl(fd, FITHAW);
if (ret == 0 && !logged) {
i++;
logged = true;
}
} while (ret == 0);
close(fd);
}
free_fs_mount_list(&mounts);
return i;
}
#endif /* CONFIG_FSFREEZE */
#if defined(CONFIG_FSFREEZE)
static char *get_pci_driver(char const *syspath, int pathlen, Error **errp)
{
char *path;
char *dpath;
char *driver = NULL;
char buf[PATH_MAX];
ssize_t len;
path = g_strndup(syspath, pathlen);
dpath = g_strdup_printf("%s/driver", path);
len = readlink(dpath, buf, sizeof(buf) - 1);
if (len != -1) {
buf[len] = 0;
driver = g_path_get_basename(buf);
}
g_free(dpath);
g_free(path);
return driver;
}
static int compare_uint(const void *_a, const void *_b)
{
unsigned int a = *(unsigned int *)_a;
unsigned int b = *(unsigned int *)_b;
return a < b ? -1 : a > b ? 1 : 0;
}
/* Walk the specified sysfs and build a sorted list of host or ata numbers */
static int build_hosts(char const *syspath, char const *host, bool ata,
unsigned int *hosts, int hosts_max, Error **errp)
{
char *path;
DIR *dir;
struct dirent *entry;
int i = 0;
path = g_strndup(syspath, host - syspath);
dir = opendir(path);
if (!dir) {
error_setg_errno(errp, errno, "opendir(\"%s\")", path);
g_free(path);
return -1;
}
while (i < hosts_max) {
entry = readdir(dir);
if (!entry) {
break;
}
if (ata && sscanf(entry->d_name, "ata%d", hosts + i) == 1) {
++i;
} else if (!ata && sscanf(entry->d_name, "host%d", hosts + i) == 1) {
++i;
}
}
qsort(hosts, i, sizeof(hosts[0]), compare_uint);
g_free(path);
closedir(dir);
return i;
}
/*
* Store disk device info for devices on the PCI bus.
* Returns true if information has been stored, or false for failure.
*/
static bool build_guest_fsinfo_for_pci_dev(char const *syspath,
GuestDiskAddress *disk,
Error **errp)
{
unsigned int pci[4], host, hosts[8], tgt[3];
int i, nhosts = 0, pcilen;
GuestPCIAddress *pciaddr = disk->pci_controller;
bool has_ata = false, has_host = false, has_tgt = false;
char *p, *q, *driver = NULL;
bool ret = false;
p = strstr(syspath, "/devices/pci");
if (!p || sscanf(p + 12, "%*x:%*x/%x:%x:%x.%x%n",
pci, pci + 1, pci + 2, pci + 3, &pcilen) < 4) {
g_debug("only pci device is supported: sysfs path '%s'", syspath);
return false;
}
p += 12 + pcilen;
while (true) {
driver = get_pci_driver(syspath, p - syspath, errp);
if (driver && (g_str_equal(driver, "ata_piix") ||
g_str_equal(driver, "sym53c8xx") ||
g_str_equal(driver, "virtio-pci") ||
g_str_equal(driver, "ahci") ||
g_str_equal(driver, "nvme") ||
g_str_equal(driver, "xhci_hcd") ||
g_str_equal(driver, "ehci-pci"))) {
break;
}
g_free(driver);
if (sscanf(p, "/%x:%x:%x.%x%n",
pci, pci + 1, pci + 2, pci + 3, &pcilen) == 4) {
p += pcilen;
continue;
}
g_debug("unsupported driver or sysfs path '%s'", syspath);
return false;
}
p = strstr(syspath, "/target");
if (p && sscanf(p + 7, "%*u:%*u:%*u/%*u:%u:%u:%u",
tgt, tgt + 1, tgt + 2) == 3) {
has_tgt = true;
}
p = strstr(syspath, "/ata");
if (p) {
q = p + 4;
has_ata = true;
} else {
p = strstr(syspath, "/host");
q = p + 5;
}
if (p && sscanf(q, "%u", &host) == 1) {
has_host = true;
nhosts = build_hosts(syspath, p, has_ata, hosts,
ARRAY_SIZE(hosts), errp);
if (nhosts < 0) {
goto cleanup;
}
}
pciaddr->domain = pci[0];
pciaddr->bus = pci[1];
pciaddr->slot = pci[2];
pciaddr->function = pci[3];
if (strcmp(driver, "ata_piix") == 0) {
/* a host per ide bus, target*:0:<unit>:0 */
if (!has_host || !has_tgt) {
g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
goto cleanup;
}
for (i = 0; i < nhosts; i++) {
if (host == hosts[i]) {
disk->bus_type = GUEST_DISK_BUS_TYPE_IDE;
disk->bus = i;
disk->unit = tgt[1];
break;
}
}
if (i >= nhosts) {
g_debug("no host for '%s' (driver '%s')", syspath, driver);
goto cleanup;
}
} else if (strcmp(driver, "sym53c8xx") == 0) {
/* scsi(LSI Logic): target*:0:<unit>:0 */
if (!has_tgt) {
g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
goto cleanup;
}
disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
disk->unit = tgt[1];
} else if (strcmp(driver, "virtio-pci") == 0) {
if (has_tgt) {
/* virtio-scsi: target*:0:0:<unit> */
disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
disk->unit = tgt[2];
} else {
/* virtio-blk: 1 disk per 1 device */
disk->bus_type = GUEST_DISK_BUS_TYPE_VIRTIO;
}
} else if (strcmp(driver, "ahci") == 0) {
/* ahci: 1 host per 1 unit */
if (!has_host || !has_tgt) {
g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
goto cleanup;
}
for (i = 0; i < nhosts; i++) {
if (host == hosts[i]) {
disk->unit = i;
disk->bus_type = GUEST_DISK_BUS_TYPE_SATA;
break;
}
}
if (i >= nhosts) {
g_debug("no host for '%s' (driver '%s')", syspath, driver);
goto cleanup;
}
} else if (strcmp(driver, "nvme") == 0) {
disk->bus_type = GUEST_DISK_BUS_TYPE_NVME;
} else if (strcmp(driver, "ehci-pci") == 0 || strcmp(driver, "xhci_hcd") == 0) {
disk->bus_type = GUEST_DISK_BUS_TYPE_USB;
} else {
g_debug("unknown driver '%s' (sysfs path '%s')", driver, syspath);
goto cleanup;
}
ret = true;
cleanup:
g_free(driver);
return ret;
}
/*
* Store disk device info for non-PCI virtio devices (for example s390x
* channel I/O devices). Returns true if information has been stored, or
* false for failure.
*/
static bool build_guest_fsinfo_for_nonpci_virtio(char const *syspath,
GuestDiskAddress *disk,
Error **errp)
{
unsigned int tgt[3];
char *p;
if (!strstr(syspath, "/virtio") || !strstr(syspath, "/block")) {
g_debug("Unsupported virtio device '%s'", syspath);
return false;
}
p = strstr(syspath, "/target");
if (p && sscanf(p + 7, "%*u:%*u:%*u/%*u:%u:%u:%u",
&tgt[0], &tgt[1], &tgt[2]) == 3) {
/* virtio-scsi: target*:0:<target>:<unit> */
disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
disk->bus = tgt[0];
disk->target = tgt[1];
disk->unit = tgt[2];
} else {
/* virtio-blk: 1 disk per 1 device */
disk->bus_type = GUEST_DISK_BUS_TYPE_VIRTIO;
}
return true;
}
/*
* Store disk device info for CCW devices (s390x channel I/O devices).
* Returns true if information has been stored, or false for failure.
*/
static bool build_guest_fsinfo_for_ccw_dev(char const *syspath,
GuestDiskAddress *disk,
Error **errp)
{
unsigned int cssid, ssid, subchno, devno;
char *p;
p = strstr(syspath, "/devices/css");
if (!p || sscanf(p + 12, "%*x/%x.%x.%x/%*x.%*x.%x/",
&cssid, &ssid, &subchno, &devno) < 4) {
g_debug("could not parse ccw device sysfs path: %s", syspath);
return false;
}
disk->ccw_address = g_new0(GuestCCWAddress, 1);
disk->ccw_address->cssid = cssid;
disk->ccw_address->ssid = ssid;
disk->ccw_address->subchno = subchno;
disk->ccw_address->devno = devno;
if (strstr(p, "/virtio")) {
build_guest_fsinfo_for_nonpci_virtio(syspath, disk, errp);
}
return true;
}
/* Store disk device info specified by @sysfs into @fs */
static void build_guest_fsinfo_for_real_device(char const *syspath,
GuestFilesystemInfo *fs,
Error **errp)
{
GuestDiskAddress *disk;
GuestPCIAddress *pciaddr;
bool has_hwinf;
#ifdef CONFIG_LIBUDEV
struct udev *udev = NULL;
struct udev_device *udevice = NULL;
#endif
pciaddr = g_new0(GuestPCIAddress, 1);
pciaddr->domain = -1; /* -1 means field is invalid */
pciaddr->bus = -1;
pciaddr->slot = -1;
pciaddr->function = -1;
disk = g_new0(GuestDiskAddress, 1);
disk->pci_controller = pciaddr;
disk->bus_type = GUEST_DISK_BUS_TYPE_UNKNOWN;
#ifdef CONFIG_LIBUDEV
udev = udev_new();
udevice = udev_device_new_from_syspath(udev, syspath);
if (udev == NULL || udevice == NULL) {
g_debug("failed to query udev");
} else {
const char *devnode, *serial;
devnode = udev_device_get_devnode(udevice);
if (devnode != NULL) {
disk->dev = g_strdup(devnode);
}
serial = udev_device_get_property_value(udevice, "ID_SERIAL");
if (serial != NULL && *serial != 0) {
disk->serial = g_strdup(serial);
}
}
udev_unref(udev);
udev_device_unref(udevice);
#endif
if (strstr(syspath, "/devices/pci")) {
has_hwinf = build_guest_fsinfo_for_pci_dev(syspath, disk, errp);
} else if (strstr(syspath, "/devices/css")) {
has_hwinf = build_guest_fsinfo_for_ccw_dev(syspath, disk, errp);
} else if (strstr(syspath, "/virtio")) {
has_hwinf = build_guest_fsinfo_for_nonpci_virtio(syspath, disk, errp);
} else {
g_debug("Unsupported device type for '%s'", syspath);
has_hwinf = false;
}
if (has_hwinf || disk->dev || disk->serial) {
QAPI_LIST_PREPEND(fs->disk, disk);
} else {
qapi_free_GuestDiskAddress(disk);
}
}
static void build_guest_fsinfo_for_device(char const *devpath,
GuestFilesystemInfo *fs,
Error **errp);
/* Store a list of slave devices of virtual volume specified by @syspath into
* @fs */
static void build_guest_fsinfo_for_virtual_device(char const *syspath,
GuestFilesystemInfo *fs,
Error **errp)
{
Error *err = NULL;
DIR *dir;
char *dirpath;
struct dirent *entry;
dirpath = g_strdup_printf("%s/slaves", syspath);
dir = opendir(dirpath);
if (!dir) {
if (errno != ENOENT) {
error_setg_errno(errp, errno, "opendir(\"%s\")", dirpath);
}
g_free(dirpath);
return;
}
for (;;) {
errno = 0;
entry = readdir(dir);
if (entry == NULL) {
if (errno) {
error_setg_errno(errp, errno, "readdir(\"%s\")", dirpath);
}
break;
}
if (entry->d_type == DT_LNK) {
char *path;
g_debug(" slave device '%s'", entry->d_name);
path = g_strdup_printf("%s/slaves/%s", syspath, entry->d_name);
build_guest_fsinfo_for_device(path, fs, &err);
g_free(path);
if (err) {
error_propagate(errp, err);
break;
}
}
}
g_free(dirpath);
closedir(dir);
}
static bool is_disk_virtual(const char *devpath, Error **errp)
{
g_autofree char *syspath = realpath(devpath, NULL);
if (!syspath) {
error_setg_errno(errp, errno, "realpath(\"%s\")", devpath);
return false;
}
return strstr(syspath, "/devices/virtual/block/") != NULL;
}
/* Dispatch to functions for virtual/real device */
static void build_guest_fsinfo_for_device(char const *devpath,
GuestFilesystemInfo *fs,
Error **errp)
{
ERRP_GUARD();
g_autofree char *syspath = NULL;
bool is_virtual = false;
syspath = realpath(devpath, NULL);
if (!syspath) {
if (errno != ENOENT) {
error_setg_errno(errp, errno, "realpath(\"%s\")", devpath);
return;
}
/* ENOENT: This devpath may not exist because of container config */
if (!fs->name) {
fs->name = g_path_get_basename(devpath);
}
return;
}
if (!fs->name) {
fs->name = g_path_get_basename(syspath);
}
g_debug(" parse sysfs path '%s'", syspath);
is_virtual = is_disk_virtual(syspath, errp);
if (*errp != NULL) {
return;
}
if (is_virtual) {
build_guest_fsinfo_for_virtual_device(syspath, fs, errp);
} else {
build_guest_fsinfo_for_real_device(syspath, fs, errp);
}
}
#ifdef CONFIG_LIBUDEV
/*
* Wrapper around build_guest_fsinfo_for_device() for getting just
* the disk address.
*/
static GuestDiskAddress *get_disk_address(const char *syspath, Error **errp)
{
g_autoptr(GuestFilesystemInfo) fs = NULL;
fs = g_new0(GuestFilesystemInfo, 1);
build_guest_fsinfo_for_device(syspath, fs, errp);
if (fs->disk != NULL) {
return g_steal_pointer(&fs->disk->value);
}
return NULL;
}
static char *get_alias_for_syspath(const char *syspath)
{
struct udev *udev = NULL;
struct udev_device *udevice = NULL;
char *ret = NULL;
udev = udev_new();
if (udev == NULL) {
g_debug("failed to query udev");
goto out;
}
udevice = udev_device_new_from_syspath(udev, syspath);
if (udevice == NULL) {
g_debug("failed to query udev for path: %s", syspath);
goto out;
} else {
const char *alias = udev_device_get_property_value(
udevice, "DM_NAME");
/*
* NULL means there was an error and empty string means there is no
* alias. In case of no alias we return NULL instead of empty string.
*/
if (alias == NULL) {
g_debug("failed to query udev for device alias for: %s",
syspath);
} else if (*alias != 0) {
ret = g_strdup(alias);
}
}
out:
udev_unref(udev);
udev_device_unref(udevice);
return ret;
}
static char *get_device_for_syspath(const char *syspath)
{
struct udev *udev = NULL;
struct udev_device *udevice = NULL;
char *ret = NULL;
udev = udev_new();
if (udev == NULL) {
g_debug("failed to query udev");
goto out;
}
udevice = udev_device_new_from_syspath(udev, syspath);
if (udevice == NULL) {
g_debug("failed to query udev for path: %s", syspath);
goto out;
} else {
ret = g_strdup(udev_device_get_devnode(udevice));
}
out:
udev_unref(udev);
udev_device_unref(udevice);
return ret;
}
static void get_disk_deps(const char *disk_dir, GuestDiskInfo *disk)
{
g_autofree char *deps_dir = NULL;
const gchar *dep;
GDir *dp_deps = NULL;
/* List dependent disks */
deps_dir = g_strdup_printf("%s/slaves", disk_dir);
g_debug(" listing entries in: %s", deps_dir);
dp_deps = g_dir_open(deps_dir, 0, NULL);
if (dp_deps == NULL) {
g_debug("failed to list entries in %s", deps_dir);
return;
}
disk->has_dependencies = true;
while ((dep = g_dir_read_name(dp_deps)) != NULL) {
g_autofree char *dep_dir = NULL;
char *dev_name;
/* Add dependent disks */
dep_dir = g_strdup_printf("%s/%s", deps_dir, dep);
dev_name = get_device_for_syspath(dep_dir);
if (dev_name != NULL) {
g_debug(" adding dependent device: %s", dev_name);
QAPI_LIST_PREPEND(disk->dependencies, dev_name);
}
}
g_dir_close(dp_deps);
}
/*
* Detect partitions subdirectory, name is "<disk_name><number>" or
* "<disk_name>p<number>"
*
* @disk_name -- last component of /sys path (e.g. sda)
* @disk_dir -- sys path of the disk (e.g. /sys/block/sda)
* @disk_dev -- device node of the disk (e.g. /dev/sda)
*/
static GuestDiskInfoList *get_disk_partitions(
GuestDiskInfoList *list,
const char *disk_name, const char *disk_dir,
const char *disk_dev)
{
GuestDiskInfoList *ret = list;
struct dirent *de_disk;
DIR *dp_disk = NULL;
size_t len = strlen(disk_name);
dp_disk = opendir(disk_dir);
while ((de_disk = readdir(dp_disk)) != NULL) {
g_autofree char *partition_dir = NULL;
char *dev_name;
GuestDiskInfo *partition;
if (!(de_disk->d_type & DT_DIR)) {
continue;
}
if (!(strncmp(disk_name, de_disk->d_name, len) == 0 &&
((*(de_disk->d_name + len) == 'p' &&
isdigit(*(de_disk->d_name + len + 1))) ||
isdigit(*(de_disk->d_name + len))))) {
continue;
}
partition_dir = g_strdup_printf("%s/%s",
disk_dir, de_disk->d_name);
dev_name = get_device_for_syspath(partition_dir);
if (dev_name == NULL) {
g_debug("Failed to get device name for syspath: %s",
disk_dir);
continue;
}
partition = g_new0(GuestDiskInfo, 1);
partition->name = dev_name;
partition->partition = true;
partition->has_dependencies = true;
/* Add parent disk as dependent for easier tracking of hierarchy */
QAPI_LIST_PREPEND(partition->dependencies, g_strdup(disk_dev));
QAPI_LIST_PREPEND(ret, partition);
}
closedir(dp_disk);
return ret;
}
static void get_nvme_smart(GuestDiskInfo *disk)
{
int fd;
GuestNVMeSmart *smart;
NvmeSmartLog log = {0};
struct nvme_admin_cmd cmd = {
.opcode = NVME_ADM_CMD_GET_LOG_PAGE,
.nsid = NVME_NSID_BROADCAST,
.addr = (uintptr_t)&log,
.data_len = sizeof(log),
.cdw10 = NVME_LOG_SMART_INFO | (1 << 15) /* RAE bit */
| (((sizeof(log) >> 2) - 1) << 16)
};
fd = qga_open_cloexec(disk->name, O_RDONLY, 0);
if (fd == -1) {
g_debug("Failed to open device: %s: %s", disk->name, g_strerror(errno));
return;
}
if (ioctl(fd, NVME_IOCTL_ADMIN_CMD, &cmd)) {
g_debug("Failed to get smart: %s: %s", disk->name, g_strerror(errno));
close(fd);
return;
}
disk->smart = g_new0(GuestDiskSmart, 1);
disk->smart->type = GUEST_DISK_BUS_TYPE_NVME;
smart = &disk->smart->u.nvme;
smart->critical_warning = log.critical_warning;
smart->temperature = lduw_le_p(&log.temperature); /* unaligned field */
smart->available_spare = log.available_spare;
smart->available_spare_threshold = log.available_spare_threshold;
smart->percentage_used = log.percentage_used;
smart->data_units_read_lo = le64_to_cpu(log.data_units_read[0]);
smart->data_units_read_hi = le64_to_cpu(log.data_units_read[1]);
smart->data_units_written_lo = le64_to_cpu(log.data_units_written[0]);
smart->data_units_written_hi = le64_to_cpu(log.data_units_written[1]);
smart->host_read_commands_lo = le64_to_cpu(log.host_read_commands[0]);
smart->host_read_commands_hi = le64_to_cpu(log.host_read_commands[1]);
smart->host_write_commands_lo = le64_to_cpu(log.host_write_commands[0]);
smart->host_write_commands_hi = le64_to_cpu(log.host_write_commands[1]);
smart->controller_busy_time_lo = le64_to_cpu(log.controller_busy_time[0]);
smart->controller_busy_time_hi = le64_to_cpu(log.controller_busy_time[1]);
smart->power_cycles_lo = le64_to_cpu(log.power_cycles[0]);
smart->power_cycles_hi = le64_to_cpu(log.power_cycles[1]);
smart->power_on_hours_lo = le64_to_cpu(log.power_on_hours[0]);
smart->power_on_hours_hi = le64_to_cpu(log.power_on_hours[1]);
smart->unsafe_shutdowns_lo = le64_to_cpu(log.unsafe_shutdowns[0]);
smart->unsafe_shutdowns_hi = le64_to_cpu(log.unsafe_shutdowns[1]);
smart->media_errors_lo = le64_to_cpu(log.media_errors[0]);
smart->media_errors_hi = le64_to_cpu(log.media_errors[1]);
smart->number_of_error_log_entries_lo =
le64_to_cpu(log.number_of_error_log_entries[0]);
smart->number_of_error_log_entries_hi =
le64_to_cpu(log.number_of_error_log_entries[1]);
close(fd);
}
static void get_disk_smart(GuestDiskInfo *disk)
{
if (disk->address
&& (disk->address->bus_type == GUEST_DISK_BUS_TYPE_NVME)) {
get_nvme_smart(disk);
}
}
GuestDiskInfoList *qmp_guest_get_disks(Error **errp)
{
GuestDiskInfoList *ret = NULL;
GuestDiskInfo *disk;
DIR *dp = NULL;
struct dirent *de = NULL;
g_debug("listing /sys/block directory");
dp = opendir("/sys/block");
if (dp == NULL) {
error_setg_errno(errp, errno, "Can't open directory \"/sys/block\"");
return NULL;
}
while ((de = readdir(dp)) != NULL) {
g_autofree char *disk_dir = NULL, *line = NULL,
*size_path = NULL;
char *dev_name;
Error *local_err = NULL;
if (de->d_type != DT_LNK) {
g_debug(" skipping entry: %s", de->d_name);
continue;
}
/* Check size and skip zero-sized disks */
g_debug(" checking disk size");
size_path = g_strdup_printf("/sys/block/%s/size", de->d_name);
if (!g_file_get_contents(size_path, &line, NULL, NULL)) {
g_debug(" failed to read disk size");
continue;
}
if (g_strcmp0(line, "0\n") == 0) {
g_debug(" skipping zero-sized disk");
continue;
}
g_debug(" adding %s", de->d_name);
disk_dir = g_strdup_printf("/sys/block/%s", de->d_name);
dev_name = get_device_for_syspath(disk_dir);
if (dev_name == NULL) {
g_debug("Failed to get device name for syspath: %s",
disk_dir);
continue;
}
disk = g_new0(GuestDiskInfo, 1);
disk->name = dev_name;
disk->partition = false;
disk->alias = get_alias_for_syspath(disk_dir);
QAPI_LIST_PREPEND(ret, disk);
/* Get address for non-virtual devices */
bool is_virtual = is_disk_virtual(disk_dir, &local_err);
if (local_err != NULL) {
g_debug(" failed to check disk path, ignoring error: %s",
error_get_pretty(local_err));
error_free(local_err);
local_err = NULL;
/* Don't try to get the address */
is_virtual = true;
}
if (!is_virtual) {
disk->address = get_disk_address(disk_dir, &local_err);
if (local_err != NULL) {
g_debug(" failed to get device info, ignoring error: %s",
error_get_pretty(local_err));
error_free(local_err);
local_err = NULL;
}
}
get_disk_deps(disk_dir, disk);
get_disk_smart(disk);
ret = get_disk_partitions(ret, de->d_name, disk_dir, dev_name);
}
closedir(dp);
return ret;
}
#endif
/* Return a list of the disk device(s)' info which @mount lies on */
static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount,
Error **errp)
{
GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs));
struct statvfs buf;
unsigned long used, nonroot_total, fr_size;
char *devpath = g_strdup_printf("/sys/dev/block/%u:%u",
mount->devmajor, mount->devminor);
fs->mountpoint = g_strdup(mount->dirname);
fs->type = g_strdup(mount->devtype);
build_guest_fsinfo_for_device(devpath, fs, errp);
if (statvfs(fs->mountpoint, &buf) == 0) {
fr_size = buf.f_frsize;
used = buf.f_blocks - buf.f_bfree;
nonroot_total = used + buf.f_bavail;
fs->used_bytes = used * fr_size;
fs->total_bytes = nonroot_total * fr_size;
fs->total_bytes_privileged = buf.f_blocks * fr_size;
fs->has_total_bytes = true;
fs->has_total_bytes_privileged = true;
fs->has_used_bytes = true;
}
g_free(devpath);
return fs;
}
GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
{
FsMountList mounts;
struct FsMount *mount;
GuestFilesystemInfoList *ret = NULL;
Error *local_err = NULL;
QTAILQ_INIT(&mounts);
if (!build_fs_mount_list(&mounts, &local_err)) {
error_propagate(errp, local_err);
return NULL;
}
QTAILQ_FOREACH(mount, &mounts, next) {
g_debug("Building guest fsinfo for '%s'", mount->dirname);
QAPI_LIST_PREPEND(ret, build_guest_fsinfo(mount, &local_err));
if (local_err) {
error_propagate(errp, local_err);
qapi_free_GuestFilesystemInfoList(ret);
ret = NULL;
break;
}
}
free_fs_mount_list(&mounts);
return ret;
}
#endif /* CONFIG_FSFREEZE */
#if defined(CONFIG_FSTRIM)
/*
* Walk list of mounted file systems in the guest, and trim them.
*/
GuestFilesystemTrimResponse *
qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
{
GuestFilesystemTrimResponse *response;
GuestFilesystemTrimResult *result;
int ret = 0;
FsMountList mounts;
struct FsMount *mount;
int fd;
struct fstrim_range r;
slog("guest-fstrim called");
QTAILQ_INIT(&mounts);
if (!build_fs_mount_list(&mounts, errp)) {
return NULL;
}
response = g_malloc0(sizeof(*response));
QTAILQ_FOREACH(mount, &mounts, next) {
result = g_malloc0(sizeof(*result));
result->path = g_strdup(mount->dirname);
QAPI_LIST_PREPEND(response->paths, result);
fd = qga_open_cloexec(mount->dirname, O_RDONLY, 0);
if (fd == -1) {
result->error = g_strdup_printf("failed to open: %s",
strerror(errno));
continue;
}
/* We try to cull filesystems we know won't work in advance, but other
* filesystems may not implement fstrim for less obvious reasons.
* These will report EOPNOTSUPP; while in some other cases ENOTTY
* will be reported (e.g. CD-ROMs).
* Any other error means an unexpected error.
*/
r.start = 0;
r.len = -1;
r.minlen = has_minimum ? minimum : 0;
ret = ioctl(fd, FITRIM, &r);
if (ret == -1) {
if (errno == ENOTTY || errno == EOPNOTSUPP) {
result->error = g_strdup("trim not supported");
} else {
result->error = g_strdup_printf("failed to trim: %s",
strerror(errno));
}
close(fd);
continue;
}
result->has_minimum = true;
result->minimum = r.minlen;
result->has_trimmed = true;
result->trimmed = r.len;
close(fd);
}
free_fs_mount_list(&mounts);
return response;
}
#endif /* CONFIG_FSTRIM */
#define LINUX_SYS_STATE_FILE "/sys/power/state"
#define SUSPEND_SUPPORTED 0
#define SUSPEND_NOT_SUPPORTED 1
typedef enum {
SUSPEND_MODE_DISK = 0,
SUSPEND_MODE_RAM = 1,
SUSPEND_MODE_HYBRID = 2,
} SuspendMode;
/*
* Executes a command in a child process using g_spawn_sync,
* returning an int >= 0 representing the exit status of the
* process.
*
* If the program wasn't found in path, returns -1.
*
* If a problem happened when creating the child process,
* returns -1 and errp is set.
*/
static int run_process_child(const char *command[], Error **errp)
{
int exit_status, spawn_flag;
GError *g_err = NULL;
bool success;
spawn_flag = G_SPAWN_SEARCH_PATH | G_SPAWN_STDOUT_TO_DEV_NULL |
G_SPAWN_STDERR_TO_DEV_NULL;
success = g_spawn_sync(NULL, (char **)command, NULL, spawn_flag,
NULL, NULL, NULL, NULL,
&exit_status, &g_err);
if (success) {
return WEXITSTATUS(exit_status);
}
if (g_err && (g_err->code != G_SPAWN_ERROR_NOENT)) {
error_setg(errp, "failed to create child process, error '%s'",
g_err->message);
}
g_error_free(g_err);
return -1;
}
static bool systemd_supports_mode(SuspendMode mode, Error **errp)
{
const char *systemctl_args[3] = {"systemd-hibernate", "systemd-suspend",
"systemd-hybrid-sleep"};
const char *cmd[4] = {"systemctl", "status", systemctl_args[mode], NULL};
int status;
status = run_process_child(cmd, errp);
/*
* systemctl status uses LSB return codes so we can expect
* status > 0 and be ok. To assert if the guest has support
* for the selected suspend mode, status should be < 4. 4 is
* the code for unknown service status, the return value when
* the service does not exist. A common value is status = 3
* (program is not running).
*/
if (status > 0 && status < 4) {
return true;
}
return false;
}
static void systemd_suspend(SuspendMode mode, Error **errp)
{
Error *local_err = NULL;
const char *systemctl_args[3] = {"hibernate", "suspend", "hybrid-sleep"};
const char *cmd[3] = {"systemctl", systemctl_args[mode], NULL};
int status;
status = run_process_child(cmd, &local_err);
if (status == 0) {
return;
}
if ((status == -1) && !local_err) {
error_setg(errp, "the helper program 'systemctl %s' was not found",
systemctl_args[mode]);
return;
}
if (local_err) {
error_propagate(errp, local_err);
} else {
error_setg(errp, "the helper program 'systemctl %s' returned an "
"unexpected exit status code (%d)",
systemctl_args[mode], status);
}
}
static bool pmutils_supports_mode(SuspendMode mode, Error **errp)
{
Error *local_err = NULL;
const char *pmutils_args[3] = {"--hibernate", "--suspend",
"--suspend-hybrid"};
const char *cmd[3] = {"pm-is-supported", pmutils_args[mode], NULL};
int status;
status = run_process_child(cmd, &local_err);
if (status == SUSPEND_SUPPORTED) {
return true;
}
if ((status == -1) && !local_err) {
return false;
}
if (local_err) {
error_propagate(errp, local_err);
} else {
error_setg(errp,
"the helper program '%s' returned an unexpected exit"
" status code (%d)", "pm-is-supported", status);
}
return false;
}
static void pmutils_suspend(SuspendMode mode, Error **errp)
{
Error *local_err = NULL;
const char *pmutils_binaries[3] = {"pm-hibernate", "pm-suspend",
"pm-suspend-hybrid"};
const char *cmd[2] = {pmutils_binaries[mode], NULL};
int status;
status = run_process_child(cmd, &local_err);
if (status == 0) {
return;
}
if ((status == -1) && !local_err) {
error_setg(errp, "the helper program '%s' was not found",
pmutils_binaries[mode]);
return;
}
if (local_err) {
error_propagate(errp, local_err);
} else {
error_setg(errp,
"the helper program '%s' returned an unexpected exit"
" status code (%d)", pmutils_binaries[mode], status);
}
}
static bool linux_sys_state_supports_mode(SuspendMode mode, Error **errp)
{
const char *sysfile_strs[3] = {"disk", "mem", NULL};
const char *sysfile_str = sysfile_strs[mode];
char buf[32]; /* hopefully big enough */
int fd;
ssize_t ret;
if (!sysfile_str) {
error_setg(errp, "unknown guest suspend mode");
return false;
}
fd = open(LINUX_SYS_STATE_FILE, O_RDONLY);
if (fd < 0) {
return false;
}
ret = read(fd, buf, sizeof(buf) - 1);
close(fd);
if (ret <= 0) {
return false;
}
buf[ret] = '\0';
if (strstr(buf, sysfile_str)) {
return true;
}
return false;
}
static void linux_sys_state_suspend(SuspendMode mode, Error **errp)
{
g_autoptr(GError) local_gerr = NULL;
const char *sysfile_strs[3] = {"disk", "mem", NULL};
const char *sysfile_str = sysfile_strs[mode];
if (!sysfile_str) {
error_setg(errp, "unknown guest suspend mode");
return;
}
if (!g_file_set_contents(LINUX_SYS_STATE_FILE, sysfile_str,
-1, &local_gerr)) {
error_setg(errp, "suspend: cannot write to '%s': %s",
LINUX_SYS_STATE_FILE, local_gerr->message);
return;
}
}
static void guest_suspend(SuspendMode mode, Error **errp)
{
Error *local_err = NULL;
bool mode_supported = false;
if (systemd_supports_mode(mode, &local_err)) {
mode_supported = true;
systemd_suspend(mode, &local_err);
if (!local_err) {
return;
}
}
error_free(local_err);
local_err = NULL;
if (pmutils_supports_mode(mode, &local_err)) {
mode_supported = true;
pmutils_suspend(mode, &local_err);
if (!local_err) {
return;
}
}
error_free(local_err);
local_err = NULL;
if (linux_sys_state_supports_mode(mode, &local_err)) {
mode_supported = true;
linux_sys_state_suspend(mode, &local_err);
}
if (!mode_supported) {
error_free(local_err);
error_setg(errp,
"the requested suspend mode is not supported by the guest");
} else {
error_propagate(errp, local_err);
}
}
void qmp_guest_suspend_disk(Error **errp)
{
guest_suspend(SUSPEND_MODE_DISK, errp);
}
void qmp_guest_suspend_ram(Error **errp)
{
guest_suspend(SUSPEND_MODE_RAM, errp);
}
void qmp_guest_suspend_hybrid(Error **errp)
{
guest_suspend(SUSPEND_MODE_HYBRID, errp);
}
/* Transfer online/offline status between @vcpu and the guest system.
*
* On input either @errp or *@errp must be NULL.
*
* In system-to-@vcpu direction, the following @vcpu fields are accessed:
* - R: vcpu->logical_id
* - W: vcpu->online
* - W: vcpu->can_offline
*
* In @vcpu-to-system direction, the following @vcpu fields are accessed:
* - R: vcpu->logical_id
* - R: vcpu->online
*
* Written members remain unmodified on error.
*/
static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu,
char *dirpath, Error **errp)
{
int fd;
int res;
int dirfd;
static const char fn[] = "online";
dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
if (dirfd == -1) {
error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
return;
}
fd = openat(dirfd, fn, sys2vcpu ? O_RDONLY : O_RDWR);
if (fd == -1) {
if (errno != ENOENT) {
error_setg_errno(errp, errno, "open(\"%s/%s\")", dirpath, fn);
} else if (sys2vcpu) {
vcpu->online = true;
vcpu->can_offline = false;
} else if (!vcpu->online) {
error_setg(errp, "logical processor #%" PRId64 " can't be "
"offlined", vcpu->logical_id);
} /* otherwise pretend successful re-onlining */
} else {
unsigned char status;
res = pread(fd, &status, 1, 0);
if (res == -1) {
error_setg_errno(errp, errno, "pread(\"%s/%s\")", dirpath, fn);
} else if (res == 0) {
error_setg(errp, "pread(\"%s/%s\"): unexpected EOF", dirpath,
fn);
} else if (sys2vcpu) {
vcpu->online = (status != '0');
vcpu->can_offline = true;
} else if (vcpu->online != (status != '0')) {
status = '0' + vcpu->online;
if (pwrite(fd, &status, 1, 0) == -1) {
error_setg_errno(errp, errno, "pwrite(\"%s/%s\")", dirpath,
fn);
}
} /* otherwise pretend successful re-(on|off)-lining */
res = close(fd);
g_assert(res == 0);
}
res = close(dirfd);
g_assert(res == 0);
}
GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
{
GuestLogicalProcessorList *head, **tail;
const char *cpu_dir = "/sys/devices/system/cpu";
const gchar *line;
g_autoptr(GDir) cpu_gdir = NULL;
Error *local_err = NULL;
head = NULL;
tail = &head;
cpu_gdir = g_dir_open(cpu_dir, 0, NULL);
if (cpu_gdir == NULL) {
error_setg_errno(errp, errno, "failed to list entries: %s", cpu_dir);
return NULL;
}
while (local_err == NULL && (line = g_dir_read_name(cpu_gdir)) != NULL) {
GuestLogicalProcessor *vcpu;
int64_t id;
if (sscanf(line, "cpu%" PRId64, &id)) {
g_autofree char *path = g_strdup_printf("/sys/devices/system/cpu/"
"cpu%" PRId64 "/", id);
vcpu = g_malloc0(sizeof *vcpu);
vcpu->logical_id = id;
vcpu->has_can_offline = true; /* lolspeak ftw */
transfer_vcpu(vcpu, true, path, &local_err);
QAPI_LIST_APPEND(tail, vcpu);
}
}
if (local_err == NULL) {
/* there's no guest with zero VCPUs */
g_assert(head != NULL);
return head;
}
qapi_free_GuestLogicalProcessorList(head);
error_propagate(errp, local_err);
return NULL;
}
int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
{
int64_t processed;
Error *local_err = NULL;
processed = 0;
while (vcpus != NULL) {
char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/",
vcpus->value->logical_id);
transfer_vcpu(vcpus->value, false, path, &local_err);
g_free(path);
if (local_err != NULL) {
break;
}
++processed;
vcpus = vcpus->next;
}
if (local_err != NULL) {
if (processed == 0) {
error_propagate(errp, local_err);
} else {
error_free(local_err);
}
}
return processed;
}
static void ga_read_sysfs_file(int dirfd, const char *pathname, char *buf,
int size, Error **errp)
{
int fd;
int res;
errno = 0;
fd = openat(dirfd, pathname, O_RDONLY);
if (fd == -1) {
error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname);
return;
}
res = pread(fd, buf, size, 0);
if (res == -1) {
error_setg_errno(errp, errno, "pread sysfs file \"%s\"", pathname);
} else if (res == 0) {
error_setg(errp, "pread sysfs file \"%s\": unexpected EOF", pathname);
}
close(fd);
}
static void ga_write_sysfs_file(int dirfd, const char *pathname,
const char *buf, int size, Error **errp)
{
int fd;
errno = 0;
fd = openat(dirfd, pathname, O_WRONLY);
if (fd == -1) {
error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname);
return;
}
if (pwrite(fd, buf, size, 0) == -1) {
error_setg_errno(errp, errno, "pwrite sysfs file \"%s\"", pathname);
}
close(fd);
}
/* Transfer online/offline status between @mem_blk and the guest system.
*
* On input either @errp or *@errp must be NULL.
*
* In system-to-@mem_blk direction, the following @mem_blk fields are accessed:
* - R: mem_blk->phys_index
* - W: mem_blk->online
* - W: mem_blk->can_offline
*
* In @mem_blk-to-system direction, the following @mem_blk fields are accessed:
* - R: mem_blk->phys_index
* - R: mem_blk->online
*- R: mem_blk->can_offline
* Written members remain unmodified on error.
*/
static void transfer_memory_block(GuestMemoryBlock *mem_blk, bool sys2memblk,
GuestMemoryBlockResponse *result,
Error **errp)
{
char *dirpath;
int dirfd;
char *status;
Error *local_err = NULL;
if (!sys2memblk) {
DIR *dp;
if (!result) {
error_setg(errp, "Internal error, 'result' should not be NULL");
return;
}
errno = 0;
dp = opendir("/sys/devices/system/memory/");
/* if there is no 'memory' directory in sysfs,
* we think this VM does not support online/offline memory block,
* any other solution?
*/
if (!dp) {
if (errno == ENOENT) {
result->response =
GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED;
}
goto out1;
}
closedir(dp);
}
dirpath = g_strdup_printf("/sys/devices/system/memory/memory%" PRId64 "/",
mem_blk->phys_index);
dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
if (dirfd == -1) {
if (sys2memblk) {
error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
} else {
if (errno == ENOENT) {
result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_NOT_FOUND;
} else {
result->response =
GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
}
}
g_free(dirpath);
goto out1;
}
g_free(dirpath);
status = g_malloc0(10);
ga_read_sysfs_file(dirfd, "state", status, 10, &local_err);
if (local_err) {
/* treat with sysfs file that not exist in old kernel */
if (errno == ENOENT) {
error_free(local_err);
if (sys2memblk) {
mem_blk->online = true;
mem_blk->can_offline = false;
} else if (!mem_blk->online) {
result->response =
GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED;
}
} else {
if (sys2memblk) {
error_propagate(errp, local_err);
} else {
error_free(local_err);
result->response =
GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
}
}
goto out2;
}
if (sys2memblk) {
char removable = '0';
mem_blk->online = (strncmp(status, "online", 6) == 0);
ga_read_sysfs_file(dirfd, "removable", &removable, 1, &local_err);
if (local_err) {
/* if no 'removable' file, it doesn't support offline mem blk */
if (errno == ENOENT) {
error_free(local_err);
mem_blk->can_offline = false;
} else {
error_propagate(errp, local_err);
}
} else {
mem_blk->can_offline = (removable != '0');
}
} else {
if (mem_blk->online != (strncmp(status, "online", 6) == 0)) {
const char *new_state = mem_blk->online ? "online" : "offline";
ga_write_sysfs_file(dirfd, "state", new_state, strlen(new_state),
&local_err);
if (local_err) {
error_free(local_err);
result->response =
GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
goto out2;
}
result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_SUCCESS;
result->has_error_code = false;
} /* otherwise pretend successful re-(on|off)-lining */
}
g_free(status);
close(dirfd);
return;
out2:
g_free(status);
close(dirfd);
out1:
if (!sys2memblk) {
result->has_error_code = true;
result->error_code = errno;
}
}
GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
{
GuestMemoryBlockList *head, **tail;
Error *local_err = NULL;
struct dirent *de;
DIR *dp;
head = NULL;
tail = &head;
dp = opendir("/sys/devices/system/memory/");
if (!dp) {
/* it's ok if this happens to be a system that doesn't expose
* memory blocks via sysfs, but otherwise we should report
* an error
*/
if (errno != ENOENT) {
error_setg_errno(errp, errno, "Can't open directory"
"\"/sys/devices/system/memory/\"");
}
return NULL;
}
/* Note: the phys_index of memory block may be discontinuous,
* this is because a memblk is the unit of the Sparse Memory design, which
* allows discontinuous memory ranges (ex. NUMA), so here we should
* traverse the memory block directory.
*/
while ((de = readdir(dp)) != NULL) {
GuestMemoryBlock *mem_blk;
if ((strncmp(de->d_name, "memory", 6) != 0) ||
!(de->d_type & DT_DIR)) {
continue;
}
mem_blk = g_malloc0(sizeof *mem_blk);
/* The d_name is "memoryXXX", phys_index is block id, same as XXX */
mem_blk->phys_index = strtoul(&de->d_name[6], NULL, 10);
mem_blk->has_can_offline = true; /* lolspeak ftw */
transfer_memory_block(mem_blk, true, NULL, &local_err);
if (local_err) {
break;
}
QAPI_LIST_APPEND(tail, mem_blk);
}
closedir(dp);
if (local_err == NULL) {
/* there's no guest with zero memory blocks */
if (head == NULL) {
error_setg(errp, "guest reported zero memory blocks!");
}
return head;
}
qapi_free_GuestMemoryBlockList(head);
error_propagate(errp, local_err);
return NULL;
}
GuestMemoryBlockResponseList *
qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
{
GuestMemoryBlockResponseList *head, **tail;
Error *local_err = NULL;
head = NULL;
tail = &head;
while (mem_blks != NULL) {
GuestMemoryBlockResponse *result;
GuestMemoryBlock *current_mem_blk = mem_blks->value;
result = g_malloc0(sizeof(*result));
result->phys_index = current_mem_blk->phys_index;
transfer_memory_block(current_mem_blk, false, result, &local_err);
if (local_err) { /* should never happen */
goto err;
}
QAPI_LIST_APPEND(tail, result);
mem_blks = mem_blks->next;
}
return head;
err:
qapi_free_GuestMemoryBlockResponseList(head);
error_propagate(errp, local_err);
return NULL;
}
GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
{
Error *local_err = NULL;
char *dirpath;
int dirfd;
char *buf;
GuestMemoryBlockInfo *info;
dirpath = g_strdup_printf("/sys/devices/system/memory/");
dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
if (dirfd == -1) {
error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
g_free(dirpath);
return NULL;
}
g_free(dirpath);
buf = g_malloc0(20);
ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err);
close(dirfd);
if (local_err) {
g_free(buf);
error_propagate(errp, local_err);
return NULL;
}
info = g_new0(GuestMemoryBlockInfo, 1);
info->size = strtol(buf, NULL, 16); /* the unit is bytes */
g_free(buf);
return info;
}
#define MAX_NAME_LEN 128
static GuestDiskStatsInfoList *guest_get_diskstats(Error **errp)
{
GuestDiskStatsInfoList *head = NULL, **tail = &head;
const char *diskstats = "/proc/diskstats";
FILE *fp;
size_t n;
char *line = NULL;
fp = fopen(diskstats, "r");
if (fp == NULL) {
error_setg_errno(errp, errno, "open(\"%s\")", diskstats);
return NULL;
}
while (getline(&line, &n, fp) != -1) {
g_autofree GuestDiskStatsInfo *diskstatinfo = NULL;
g_autofree GuestDiskStats *diskstat = NULL;
char dev_name[MAX_NAME_LEN];
unsigned int ios_pgr, tot_ticks, rq_ticks, wr_ticks, dc_ticks, fl_ticks;
unsigned long rd_ios, rd_merges_or_rd_sec, rd_ticks_or_wr_sec, wr_ios;
unsigned long wr_merges, rd_sec_or_wr_ios, wr_sec;
unsigned long dc_ios, dc_merges, dc_sec, fl_ios;
unsigned int major, minor;
int i;
i = sscanf(line, "%u %u %s %lu %lu %lu"
"%lu %lu %lu %lu %u %u %u %u"
"%lu %lu %lu %u %lu %u",
&major, &minor, dev_name,
&rd_ios, &rd_merges_or_rd_sec, &rd_sec_or_wr_ios,
&rd_ticks_or_wr_sec, &wr_ios, &wr_merges, &wr_sec,
&wr_ticks, &ios_pgr, &tot_ticks, &rq_ticks,
&dc_ios, &dc_merges, &dc_sec, &dc_ticks,
&fl_ios, &fl_ticks);
if (i < 7) {
continue;
}
diskstatinfo = g_new0(GuestDiskStatsInfo, 1);
diskstatinfo->name = g_strdup(dev_name);
diskstatinfo->major = major;
diskstatinfo->minor = minor;
diskstat = g_new0(GuestDiskStats, 1);
if (i == 7) {
diskstat->has_read_ios = true;
diskstat->read_ios = rd_ios;
diskstat->has_read_sectors = true;
diskstat->read_sectors = rd_merges_or_rd_sec;
diskstat->has_write_ios = true;
diskstat->write_ios = rd_sec_or_wr_ios;
diskstat->has_write_sectors = true;
diskstat->write_sectors = rd_ticks_or_wr_sec;
}
if (i >= 14) {
diskstat->has_read_ios = true;
diskstat->read_ios = rd_ios;
diskstat->has_read_sectors = true;
diskstat->read_sectors = rd_sec_or_wr_ios;
diskstat->has_read_merges = true;
diskstat->read_merges = rd_merges_or_rd_sec;
diskstat->has_read_ticks = true;
diskstat->read_ticks = rd_ticks_or_wr_sec;
diskstat->has_write_ios = true;
diskstat->write_ios = wr_ios;
diskstat->has_write_sectors = true;
diskstat->write_sectors = wr_sec;
diskstat->has_write_merges = true;
diskstat->write_merges = wr_merges;
diskstat->has_write_ticks = true;
diskstat->write_ticks = wr_ticks;
diskstat->has_ios_pgr = true;
diskstat->ios_pgr = ios_pgr;
diskstat->has_total_ticks = true;
diskstat->total_ticks = tot_ticks;
diskstat->has_weight_ticks = true;
diskstat->weight_ticks = rq_ticks;
}
if (i >= 18) {
diskstat->has_discard_ios = true;
diskstat->discard_ios = dc_ios;
diskstat->has_discard_merges = true;
diskstat->discard_merges = dc_merges;
diskstat->has_discard_sectors = true;
diskstat->discard_sectors = dc_sec;
diskstat->has_discard_ticks = true;
diskstat->discard_ticks = dc_ticks;
}
if (i >= 20) {
diskstat->has_flush_ios = true;
diskstat->flush_ios = fl_ios;
diskstat->has_flush_ticks = true;
diskstat->flush_ticks = fl_ticks;
}
diskstatinfo->stats = g_steal_pointer(&diskstat);
QAPI_LIST_APPEND(tail, diskstatinfo);
diskstatinfo = NULL;
}
free(line);
fclose(fp);
return head;
}
GuestDiskStatsInfoList *qmp_guest_get_diskstats(Error **errp)
{
return guest_get_diskstats(errp);
}
GuestCpuStatsList *qmp_guest_get_cpustats(Error **errp)
{
GuestCpuStatsList *head = NULL, **tail = &head;
const char *cpustats = "/proc/stat";
int clk_tck = sysconf(_SC_CLK_TCK);
FILE *fp;
size_t n;
char *line = NULL;
fp = fopen(cpustats, "r");
if (fp == NULL) {
error_setg_errno(errp, errno, "open(\"%s\")", cpustats);
return NULL;
}
while (getline(&line, &n, fp) != -1) {
GuestCpuStats *cpustat = NULL;
GuestLinuxCpuStats *linuxcpustat;
int i;
unsigned long user, system, idle, iowait, irq, softirq, steal, guest;
unsigned long nice, guest_nice;
char name[64];
i = sscanf(line, "%s %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu",
name, &user, &nice, &system, &idle, &iowait, &irq, &softirq,
&steal, &guest, &guest_nice);
/* drop "cpu 1 2 3 ...", get "cpuX 1 2 3 ..." only */
if ((i == EOF) || strncmp(name, "cpu", 3) || (name[3] == '\0')) {
continue;
}
if (i < 5) {
slog("Parsing cpu stat from %s failed, see \"man proc\"", cpustats);
break;
}
cpustat = g_new0(GuestCpuStats, 1);
cpustat->type = GUEST_CPU_STATS_TYPE_LINUX;
linuxcpustat = &cpustat->u.q_linux;
linuxcpustat->cpu = atoi(&name[3]);
linuxcpustat->user = user * 1000 / clk_tck;
linuxcpustat->nice = nice * 1000 / clk_tck;
linuxcpustat->system = system * 1000 / clk_tck;
linuxcpustat->idle = idle * 1000 / clk_tck;
if (i > 5) {
linuxcpustat->has_iowait = true;
linuxcpustat->iowait = iowait * 1000 / clk_tck;
}
if (i > 6) {
linuxcpustat->has_irq = true;
linuxcpustat->irq = irq * 1000 / clk_tck;
linuxcpustat->has_softirq = true;
linuxcpustat->softirq = softirq * 1000 / clk_tck;
}
if (i > 8) {
linuxcpustat->has_steal = true;
linuxcpustat->steal = steal * 1000 / clk_tck;
}
if (i > 9) {
linuxcpustat->has_guest = true;
linuxcpustat->guest = guest * 1000 / clk_tck;
}
if (i > 10) {
linuxcpustat->has_guest = true;
linuxcpustat->guest = guest * 1000 / clk_tck;
linuxcpustat->has_guestnice = true;
linuxcpustat->guestnice = guest_nice * 1000 / clk_tck;
}
QAPI_LIST_APPEND(tail, cpustat);
}
free(line);
fclose(fp);
return head;
}
static char *hex_to_ip_address(const void *hex_value, int is_ipv6)
{
if (is_ipv6) {
char addr[INET6_ADDRSTRLEN];
struct in6_addr in6;
const char *hex_str = (const char *)hex_value;
int i;
for (i = 0; i < 16; i++) {
if (sscanf(&hex_str[i * 2], "%02hhx", &in6.s6_addr[i]) != 1) {
return NULL;
}
}
inet_ntop(AF_INET6, &in6, addr, INET6_ADDRSTRLEN);
return g_strdup(addr);
} else {
unsigned int hex_int = *(unsigned int *)hex_value;
unsigned int byte1 = (hex_int >> 24) & 0xFF;
unsigned int byte2 = (hex_int >> 16) & 0xFF;
unsigned int byte3 = (hex_int >> 8) & 0xFF;
unsigned int byte4 = hex_int & 0xFF;
return g_strdup_printf("%u.%u.%u.%u", byte4, byte3, byte2, byte1);
}
}
GuestNetworkRouteList *qmp_guest_network_get_route(Error **errp)
{
GuestNetworkRouteList *head = NULL, **tail = &head;
const char *route_files[] = {"/proc/net/route", "/proc/net/ipv6_route"};
FILE *fp;
size_t n = 0;
char *line = NULL;
int firstLine;
int is_ipv6;
int i;
char iface[IFNAMSIZ];
for (i = 0; i < 2; i++) {
firstLine = 1;
is_ipv6 = (i == 1);
fp = fopen(route_files[i], "r");
if (fp == NULL) {
error_setg_errno(errp, errno, "open(\"%s\")", route_files[i]);
continue;
}
while (getline(&line, &n, fp) != -1) {
if (firstLine && !is_ipv6) {
firstLine = 0;
continue;
}
g_autoptr(GuestNetworkRoute) route = g_new0(GuestNetworkRoute, 1);
if (is_ipv6) {
char destination[33], source[33], next_hop[33];
int des_prefixlen, src_prefixlen, metric, refcnt, use, flags;
if (sscanf(line, "%32s %x %32s %x %32s %x %x %x %x %s",
destination, &des_prefixlen, source,
&src_prefixlen, next_hop, &metric, &refcnt,
&use, &flags, iface) != 10) {
continue;
}
route->destination = hex_to_ip_address(destination, 1);
if (route->destination == NULL) {
continue;
}
route->iface = g_strdup(iface);
route->source = hex_to_ip_address(source, 1);
route->nexthop = hex_to_ip_address(next_hop, 1);
route->desprefixlen = g_strdup_printf("%d", des_prefixlen);
route->srcprefixlen = g_strdup_printf("%d", src_prefixlen);
route->metric = metric;
route->has_flags = true;
route->flags = flags;
route->has_refcnt = true;
route->refcnt = refcnt;
route->has_use = true;
route->use = use;
route->version = 6;
} else {
unsigned int destination, gateway, mask, flags;
int refcnt, use, metric, mtu, window, irtt;
if (sscanf(line, "%s %X %X %x %d %d %d %X %d %d %d",
iface, &destination, &gateway, &flags, &refcnt,
&use, &metric, &mask, &mtu, &window, &irtt) != 11) {
continue;
}
route->destination = hex_to_ip_address(&destination, 0);
if (route->destination == NULL) {
continue;
}
route->iface = g_strdup(iface);
route->gateway = hex_to_ip_address(&gateway, 0);
route->mask = hex_to_ip_address(&mask, 0);
route->metric = metric;
route->has_flags = true;
route->flags = flags;
route->has_refcnt = true;
route->refcnt = refcnt;
route->has_use = true;
route->use = use;
route->has_mtu = true;
route->mtu = mtu;
route->has_window = true;
route->window = window;
route->has_irtt = true;
route->irtt = irtt;
route->version = 4;
}
QAPI_LIST_APPEND(tail, route);
route = NULL;
}
fclose(fp);
}
free(line);
return head;
}
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