diff options
| -rw-r--r-- | qga/commands-posix.c | 303 |
1 files changed, 292 insertions, 11 deletions
diff --git a/qga/commands-posix.c b/qga/commands-posix.c index 422144b..3711080 100644 --- a/qga/commands-posix.c +++ b/qga/commands-posix.c @@ -1150,13 +1150,27 @@ static void build_guest_fsinfo_for_virtual_device(char const *syspath, 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) { - char *syspath = realpath(devpath, NULL); + ERRP_GUARD(); + g_autofree char *syspath = NULL; + bool is_virtual = false; + syspath = realpath(devpath, NULL); if (!syspath) { error_setg_errno(errp, errno, "realpath(\"%s\")", devpath); return; @@ -1167,16 +1181,281 @@ static void build_guest_fsinfo_for_device(char const *devpath, } g_debug(" parse sysfs path '%s'", syspath); - - if (strstr(syspath, "/devices/virtual/block/")) { + 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; - free(syspath); + 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; + } + while ((dep = g_dir_read_name(dp_deps)) != NULL) { + g_autofree char *dep_dir = NULL; + strList *dep_item = 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); + dep_item = g_new0(strList, 1); + dep_item->value = dev_name; + dep_item->next = disk->dependents; + disk->dependents = dep_item; + } + } + 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 *item, *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; + /* Add parent disk as dependent for easier tracking of hierarchy */ + partition->dependents = g_new0(strList, 1); + partition->dependents->value = g_strdup(disk_dev); + + item = g_new0(GuestDiskInfoList, 1); + item->value = partition; + item->next = ret; + ret = item; + + } + closedir(dp_disk); + + return ret; +} + +GuestDiskInfoList *qmp_guest_get_disks(Error **errp) +{ + GuestDiskInfoList *item, *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); + disk->has_alias = (disk->alias != NULL); + item = g_new0(GuestDiskInfoList, 1); + item->value = disk; + item->next = ret; + ret = item; + + /* 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; + } else if (disk->address != NULL) { + disk->has_address = true; + } + } + + get_disk_deps(disk_dir, disk); + ret = get_disk_partitions(ret, de->d_name, disk_dir, dev_name); + } + return ret; +} + +#else + +GuestDiskInfoList *qmp_guest_get_disks(Error **errp) +{ + error_setg(errp, QERR_UNSUPPORTED); + return NULL; +} + +#endif + /* Return a list of the disk device(s)' info which @mount lies on */ static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount, Error **errp) @@ -2773,6 +3052,13 @@ int64_t qmp_guest_fsfreeze_thaw(Error **errp) return 0; } + +GuestDiskInfoList *qmp_guest_get_disks(Error **errp) +{ + error_setg(errp, QERR_UNSUPPORTED); + return NULL; +} + #endif /* CONFIG_FSFREEZE */ #if !defined(CONFIG_FSTRIM) @@ -2809,7 +3095,8 @@ GList *ga_command_blacklist_init(GList *blacklist) const char *list[] = { "guest-get-fsinfo", "guest-fsfreeze-status", "guest-fsfreeze-freeze", "guest-fsfreeze-freeze-list", - "guest-fsfreeze-thaw", "guest-get-fsinfo", NULL}; + "guest-fsfreeze-thaw", "guest-get-fsinfo", + "guest-get-disks", NULL}; char **p = (char **)list; while (*p) { @@ -3051,9 +3338,3 @@ GuestDeviceInfoList *qmp_guest_get_devices(Error **errp) return NULL; } - -GuestDiskInfoList *qmp_guest_get_disks(Error **errp) -{ - error_setg(errp, QERR_UNSUPPORTED); - return NULL; -} |