/* * This file is part of the Distributed Network Block Device 3 * * Copyright(c) 2011-2012 Johann Latocha * * This file may be licensed under the terms of of the * GNU General Public License Version 2 (the ``GPL''). * * Software distributed under the License is distributed * on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either * express or implied. See the GPL for the specific language * governing rights and limitations. * * You should have received a copy of the GPL along with this * program. If not, go to http://www.gnu.org/licenses/gpl.html * or write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * */ #ifndef SERVER_H_ #define SERVER_H_ #include #include #include #include "../config.h" #include "../types.h" // one byte in the map covers 8 4kib blocks, so 32kib per byte // "+ (1 << 15) - 1" is required to account for the last bit of // the image that is smaller than 32kib // this would be the case whenever the image file size is not a // multiple of 32kib (= the number of blocks is not divisible by 8) // ie: if the image is 49152 bytes and you do 49152 >> 15 you get 1, // but you actually need 2 bytes to have a complete cache map #define IMGSIZE_TO_MAPBYTES(bytes) ((int)(((bytes) + (1 << 15) - 1) >> 15)) typedef struct { char *config_group; // exact name of group in config file that represents this image char *low_name; // full (global) name of image, lowercased for comparison, eg. "uni-freiburg/rz/ubuntu-12.04" int rid; // revision of provided image char *file; // path to image file or device uint64_t filesize; // size of image dnbd3_server_entry_t servers[NUMBER_SERVERS]; // known alt servers that also offer that image time_t atime; // last access time uint8_t *cache_map; // cache map telling which parts are locally cached char *cache_file; // path to local cache of image (in case the image is read from a dnbd3 device) char working; // whether this image is considered working. local images are "working" if the local file exists, proxied images have to have at least one working upstream server or a complete local cache file time_t delete_soft; // unixtime telling when this image should be deleted. if there are still clients using this image it weill be kept, but new clients requesting the image will be rejected. 0 = never time_t delete_hard; // unixtime telling when this image should be deleted, no matter if there are still clients connected. 0 = never uint8_t relayed; // TRUE if relayed from other server (needs dnbd3 client module loaded) } dnbd3_image_t; typedef struct { int sock; uint8_t ipaddr[16]; uint8_t addrtype; // ip version (AF_INET or AF_INET6) uint8_t is_server; // TRUE if a server in proxy mode, FALSE if real client pthread_t thread; dnbd3_image_t *image; } dnbd3_client_t; extern GSList *_dnbd3_clients; // of dnbd3_client_t extern pthread_spinlock_t _spinlock; extern char *_config_file_name, *_local_namespace, *_ipc_password; extern GSList *_dnbd3_images; // of dnbd3_image_t #ifdef _DEBUG extern int _fake_delay; #endif void dnbd3_cleanup(); #if !defined(_FILE_OFFSET_BITS) || _FILE_OFFSET_BITS != 64 #error Please set _FILE_OFFSET_BITS to 64 in your makefile/configuration #endif #endif /* SERVER_H_ */