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/*
* dmc.h,v 1.2 1999/12/09 13:46:16 jdurand Exp
*/
/*
* Copyright (C) 1997-1999 by CERN/IT/PDP/DM
* All rights reserved
*/
/* @(#)dmc.h,v 1.2 1999/12/09 13:46:16 CERN IT-PDP/DM Olof Barring */
/*
* CERN interface to DEC Media Robot Driver (MRD) library.
* dmc.h - CERN specific definitions for driving Dec SCSI-2 Media Changer (dmc)
*/
/******************************************************************************/
/* */
/* Implementation details: */
/* - Data structures for inventory are general and therefore complicated. */
/* They allow for several media changers to be driven by the same server */
/* (unlikely to be used). They allow for an easy way to hash over VIDs */
/* and hence a two way entry to the inventory: either by cartrige name */
/* (*EMPTY for empty elements) or by element address (slot number, etc.).*/
/* Duplicated VIDs (like *EMPTY) are chained so that no elements are lost*/
/* in the hashing. A VID is always associated to the same DMCcart_t */
/* structure (until it is ejected) - moving a cartrige is done by */
/* swapping pointer in the inventory. Thus the history of each VID is */
/* maintained (nb. moves, nb. mounts, last move, last mount, home */
/* position). */
/* - Some macros for crude tracebacks are included to facilitate error */
/* tracing. Could be redefined to null when code is stable to reduce the */
/* log-output. */
/* - In addition to the MRD status codes a few internal return codes are */
/* defined. They are needed in case a request is inconsistent with the */
/* local inventory (NO_SUCH_LOADER, NO_SUCH_DRIVE, DESTINATION_NOT_EMPTY,*/
/* VOLUME_NOT_FOUND, SOURCE_EMPTY) or to bind several MRD status codes */
/* to one retry operation (UPDATE_INVENTORY). */
/* - Sockets are used for client-server communication. listen backlog limit*/
/* should probably be increased to allow for queued requests when server */
/* is stalled (e.g. door opened). */
/* - There are two security issues with the current implementation: */
/* - no check on the caller (except that the node name is logged). */
/* - server specific requests (DMC_HOLD, DMC_RELEASE and DMC_SHUTDOWN) */
/* should probably be protected but no such mechanism is currently */
/* implemented. */
/* */
/* - To improve the operator access in very busy environments, a second */
/* is defined for exclusive operator use. This port, which defaults to */
/* DMC_OP_PORT, is given higher priority in dmc_wait_client. If dmcserv */
/* is called with the -p (port) option the operator port is defined to */
/* be the specified port + 1. Although this second port was added after */
/* tests in real production and its implementation is a bit clumsy with */
/* several code replications, the code was not beautified to use a two */
/* entry port array because this would decrease the readability (the */
/* opertator port definitions now all end with a _op). The files */
/* concerned are dmc.h, dmc_init_network.c and dmc_wait_client.c . */
/* */
/******************************************************************************/
#ifndef _DMC_H
#define _DMC_H
#include <errno.h>
#if defined(DMCSERV) || defined(DMCMGR)
#include <serrno.h>
#include <log.h>
#else
#include "../h/serrno.h"
#include "../h/log.h"
#endif
#include <time.h>
/*
* Define the geography
*/
#define NB_SILOS 5
#define ROBOT_NAMES "/dev/mc8",""
#define DRIVE_NAMES "dlr03","dlr02","dlr01","dlr13","dlr12","dlr11",\
"dlr23","dlr22","dlr21","dlr33","dlr32","dlr31","dlr43","dlr42","dlr41"
#define CLN_SLOTS {0,1,264,265,528,529,792,793,1056,1057,-1} /* Protected CLN slots */
#define CLN_PREFIX "CLN" /* Prefix of cleaning cartridges */
#define USE_DYNAMIC_INVENTORY 1
/*
* Names and limits
*/
#ifndef LOGFILE
#ifdef DEBUG
#define LOGFILE "/tmp/testmru.log"
#else
#define LOGFILE "/usr/spool/robot/log"
#endif /*DEBUG */
#endif /*LOGFILE */
#define ACCEPT_RETRY_MAX 5 /* Number of accept() max retries */
#define ACCEPT_RETRY_DELAY 5 /* Delay between accept() retries */
#define DMC_NAME "tl820"
#define DMC_PROTO "tcp"
#ifdef SOMAXCONN
#define DMC_BACKLOG SOMAXCONN
#else
#define DMC_BACKLOG 5
#endif
#define DMC_PORT 8888
#define DMC_OP_PORT 8889
#ifndef DEBUG
#define DMC_HOST "shd34"
#endif
#define DMC_ADDRESS_OFFSET 0 /* Address offset for MRU calls (slot 0 == 1 ...etc.) */
#define C_MAGIC 0x10aa5b
#define S_MAGIC 0x10aa5c
#define SORTED -1 /* Extra element_type for DMC_PRTINV requests */
/*
* Request types
*/
#define DMC_NULL 0 /* Do nothing request */
#define DMC_MOUNT 1 /* Mount request */
#define DMC_UNMOUNT 2 /* Unmount request */
#define DMC_EXPORT 3 /* Export tape request */
#define DMC_IMPORT 4 /* Import tape request */
#define DMC_INVENTORY 5 /* Rebuild local inventory request */
#define DMC_PRTINV 6 /* Print inventory request */
#define DMC_MOVE 7 /* Move VID to specified empty destination */
#define DMC_HOME 8 /* Return VID to its home position */
#define DMC_PARTITION 9 /* Partition individual groups of slots */
#define DMC_PING 96 /* Ping request */
#define DMC_HOLD 97 /* Hold DMC server (accept no more requests except DMC_RELEASE) */
#define DMC_RELEASE 98 /* Release DMC server */
#define DMC_SHUTDOWN 99 /* Shut down DMC server request*/
/*
* Macros for testing that a numbered element (slot, drive or port) Y is within
* the limits for the robot numbered X. Example of usage:
* if ( VALID_SLOT(robot_nb,slot_nb) ) { ... }
*/
#define VALID_SLOT(X,Y) (inventory != NULL && X>=0 && \
X<inventory[0].nb_robots && Y>=0 && Y<inventory[X].nb_slots)
#define VALID_DRIVE(X,Y) (inventory != NULL && X>=0 && \
X<inventory[0].nb_robots && Y>=0 && Y<inventory[X].nb_drives)
#define VALID_PORT(X,Y) (inventory != NULL && X>=0 && \
X<inventory[0].nb_robots && Y>=0 && Y<inventory[X].nb_ports)
/*
* Upper and lower case casts
*/
#define UPPERCASE(a) \
{char *_c; \
for (_c=a; *_c != '\0'; _c++) *_c=toupper(*_c); \
}
#define LOWERCASE(a) \
{char *_c; \
for (_c=a; *_c != '\0'; _c++) *_c=tolower(*_c); \
}
/*
* Some macros to implement a primitive procedure traceback mechanism.
* Useful only when one procedure = one source file. Use as follows:
* UNWIND_START should be called in the end of the declaration section of
* the procedure (but before the execution entry point). The Return macro
* should replace the normal return. STACK_TRACE should be called in the
* signal catcher or the exit routine (if exit through Die). Call-stack
* will bail out and STACK_TRACE will cease to work (but not cause any crash)
* if stack deepth larger than 20.
*/
#define INIT_UNWIND int _dmc_stack_pointer_ = 0; char *_dmc_stack_[20];
#define UNWIND_START \
static char _dmc_name_[] = __FILE__; \
extern int _dmc_stack_pointer_; \
extern char *_dmc_stack_[20];\
if ( _dmc_stack_pointer_ < 20 && _dmc_stack_pointer_ >= 0 ) \
_dmc_stack_[_dmc_stack_pointer_++] = &_dmc_name_[0];
#define UNWIND_END _dmc_stack_pointer_--;
#define STACK_TRACE \
{ int _dmc_sp_; \
log(LOG_ERR,"Symbolic traceback at %s line %d\n",__FILE__,__LINE__); \
for (_dmc_sp_ = 0; _dmc_sp_<_dmc_stack_pointer_; _dmc_sp_++) \
{log(LOG_ERR,"\t%d\t%s\n",_dmc_sp_,_dmc_stack_[_dmc_sp_]);}}
#define Return(A) {UNWIND_END return(A);}
/*
* Return codes
*/
#define NO_SUCH_LOADER -10
#define NO_SUCH_DRIVE -11
#define DESTINATION_NOT_EMPTY -12
#define VOLUME_NOT_FOUND -13
#define UPDATE_INVENTORY -14
#define SOURCE_EMPTY -15
#define INVALID_OPERATION -16
#define ROBOT_FULL -17
#define SERVER_HOLD -18
#define COMM_ERROR -19
struct DMCcart {
char *vid; /* VID of cartrige. *EMPTY if element is empty */
struct DMCcart *next; /* Next doublet element. Should only happen for *EMPTY */
int robot_nb; /* Inventory index of the robot holding this cartridge */
int partition_nb; /* Partition to which this VID belongs */
int current_type; /* Current element type (SLOT, DRIVE or PORT) */
int home_type; /* Home element type (SLOT, DRIVE or PORT) */
int current_position; /* Current position (slot, drive or port number) */
int home_position; /* Home position (slot, drive or port number) */
int usage; /* Total number of operations on this VID */
int load_usage; /* Total number of times this VID has been loaded */
time_t start_time; /* Start time for this volume */
time_t last_used; /* Last time this VID was operated */
time_t last_load; /* Last time this VID was successfully loaded on a drive */
} DMCcart;
typedef struct DMCcart DMCcart_t;
typedef struct {
int nb_robots; /* Total number of robots */
char *robot_name; /* Name or this robot, e.g. mc54 */
int nb_slots; /* Number of slots in robot */
int nb_drives; /* Number of drives in robot */
int nb_ports; /* Number of ports in robot */
int nb_transports; /* Number of transport elements */
DMCcart_t **slot; /* Array of cartrige structures indexed by slot number */
DMCcart_t **drive; /* Array of cartrige structures indexed by drive number */
DMCcart_t **port; /* Array of cartrige structures indexed by port number */
} DMCinventory_t;
typedef struct {
int magic;
int reqtype;
char host[16];
int jid;
char loader[16]; /*
* Loader name begins with a "d" and
* the follows the special file name
* followed by a "," and finally the
* drive name, e.g. dmc54,dlr42 for
* /dev/mc54 special file for robot
* and drive dlr42.
*/
char vid[7]; /* vid requested (if vid addressing is used).*/
int robot_nb; /* Robot number (if element addressing is used). */
int element_type; /* Element type (if element addressing is used). E.g. SLOT */
int element_nb; /* Element number (if elemente addressing is used).*/
short cartridge_side; /* used if supported by robot */
} DMCrequest_t;
typedef struct {
int magic;
int status;
int log_info_l;
char *log_info;
#if !defined(__osf__) && !defined(__alpha)
char *fill[2];
#endif
} DMCreply_t;
typedef struct {
int s; /* client socket */
int s_op; /* operator socket */
int ns; /* to use socket from accept */
char *host; /* remote host name */
struct sockaddr_in *addr; /* inet socket address of client */
int *addrlen; /* size of addr */
struct sockaddr_in *addr_op; /* inet socket address of operator*/
int *addrlen_op; /* size of addr_op */
} DMCnetwork_t;
typedef struct {
char *afstr;
char *typestr;
char *portstr;
} DMCoptions_t;
/*
* Prototypes
*/
#if defined(__STDC__)
extern int dmc_build_inventory(DMCinventory_t **);
extern int dmc_destroy_inventory(DMCinventory_t **);
extern int dmc_rehash(DMCinventory_t *);
extern DMCcart_t *dmc_find_vid(DMCinventory_t *, char *);
extern DMCcart_t *dmc_nearest_empty(DMCinventory_t *, char *);
extern int dmc_move_vid(DMCinventory_t *, char *, DMCcart_t *);
extern int dmc_swap_position(DMCinventory_t *,DMCcart_t *, DMCcart_t *);
extern int dmc_mount(DMCinventory_t *, DMCrequest_t *, DMCreply_t *);
extern int dmc_unmount(DMCinventory_t *, DMCrequest_t *, DMCreply_t *);
extern int dmc_wait_client(DMCnetwork_t *);
extern int dmc_init_network(DMCnetwork_t **, DMCoptions_t *);
extern int dmc_init_options(int, char **, DMCoptions_t **);
extern int dmc_init_handlers();
extern int dmc_alrm(int sig);
extern DMCrequest_t *dmc_from_client(DMCnetwork_t *);
extern int dmc_to_client(DMCnetwork_t *,DMCreply_t *);
extern void dmc_shutdown(DMCnetwork_t *);
extern int dmc_print_content(DMCinventory_t *, DMCrequest_t *, DMCreply_t *);
extern int dmc_home(DMCinventory_t *, DMCrequest_t *, DMCreply_t *);
extern int dmc_move(DMCinventory_t *, DMCrequest_t *, DMCreply_t *);
extern int dmc_eject(DMCinventory_t *, DMCrequest_t *, DMCreply_t *);
extern int dmc_partition(DMCinventory_t *, DMCrequest_t *, DMCreply_t *);
extern int dmc_save(DMCrequest_t *);
extern DMCrequest_t *dmc_restore();
extern int dmc_check_port(DMCinventory_t *);
extern int dmc_message(DMCreply_t *, char *, ... );
extern int dmc_rbterr(int, int, int *);
#else /* !defined(__STDC__) */
extern int dmc_build_inventory();
extern int dmc_destroy_inventory();
extern int dmc_rehash();
extern DMCcart_t *dmc_find_vid();
extern DMCcart_t *dmc_nearest_empty();
extern int dmc_move_vid();
extern int dmc_swap_position();
extern int dmc_mount();
extern int dmc_unmount();
extern int dmc_wait_client();
extern int dmc_init_network();
extern int dmc_init_options();
extern int dmc_init_handlers();
extern int dmc_alrm();
extern DMCrequest_t *dmc_from_client();
extern int dmc_to_client();
extern void dmc_shutdown();
extern int dmc_print_content();
extern int dmc_home();
extern int dmc_move();
extern int dmc_eject();
extern int dmc_partition();
extern int dmc_save();
extern DMCrequest_t *dmc_restore();
extern int dmc_check_port();
extern int dmc_message();
extern int dmc_rbterr();
#endif /* __STDC__ */
#endif /* _DMC_H */
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