257 lines
10 KiB
C
257 lines
10 KiB
C
/*-
|
|
* Copyright (c) 1997, 1998
|
|
* Nan Yang Computer Services Limited. All rights reserved.
|
|
*
|
|
* This software is distributed under the so-called ``Berkeley
|
|
* License'':
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Nan Yang Computer
|
|
* Services Limited.
|
|
* 4. Neither the name of the Company nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* This software is provided ``as is'', and any express or implied
|
|
* warranties, including, but not limited to, the implied warranties of
|
|
* merchantability and fitness for a particular purpose are disclaimed.
|
|
* In no event shall the company or contributors be liable for any
|
|
* direct, indirect, incidental, special, exemplary, or consequential
|
|
* damages (including, but not limited to, procurement of substitute
|
|
* goods or services; loss of use, data, or profits; or business
|
|
* interruption) however caused and on any theory of liability, whether
|
|
* in contract, strict liability, or tort (including negligence or
|
|
* otherwise) arising in any way out of the use of this software, even if
|
|
* advised of the possibility of such damage.
|
|
*
|
|
* $Id: request.h,v 1.16 1999/10/12 04:33:24 grog Exp grog $
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/* Information needed to set up a transfer */
|
|
|
|
enum xferinfo {
|
|
XFR_NORMAL_READ = 1,
|
|
XFR_NORMAL_WRITE = 2, /* write request in normal mode */
|
|
XFR_RECOVERY_READ = 4,
|
|
XFR_DEGRADED_WRITE = 8,
|
|
XFR_PARITYLESS_WRITE = 0x10,
|
|
XFR_NO_PARITY_STRIPE = 0x20, /* parity stripe is not available */
|
|
XFR_DATA_BLOCK = 0x40, /* data block in request */
|
|
XFR_PARITY_BLOCK = 0x80, /* parity block in request */
|
|
XFR_BAD_SUBDISK = 0x100, /* this subdisk is dead */
|
|
XFR_MALLOCED = 0x200, /* this buffer is malloced */
|
|
#if VINUMDEBUG
|
|
XFR_PHASE2 = 0x800, /* documentation only: 2nd phase write */
|
|
#endif
|
|
XFR_REVIVECONFLICT = 0x1000, /* possible conflict with a revive operation */
|
|
/* operations that need a parity block */
|
|
XFR_PARITYOP = (XFR_NORMAL_WRITE | XFR_RECOVERY_READ | XFR_DEGRADED_WRITE),
|
|
/* operations that use the group parameters */
|
|
XFR_GROUPOP = (XFR_DEGRADED_WRITE | XFR_RECOVERY_READ),
|
|
/* operations that that use the data parameters */
|
|
XFR_DATAOP = (XFR_NORMAL_READ | XFR_NORMAL_WRITE | XFR_PARITYLESS_WRITE),
|
|
/* operations requiring read before write */
|
|
XFR_RBW = (XFR_NORMAL_WRITE | XFR_DEGRADED_WRITE),
|
|
/* operations that need a malloced buffer */
|
|
XFR_NEEDS_MALLOC = (XFR_NORMAL_WRITE | XFR_RECOVERY_READ | XFR_DEGRADED_WRITE)
|
|
};
|
|
|
|
/*
|
|
* Describe one low-level request, part of a
|
|
* high-level request. This is an extended
|
|
* struct buf buffer, and the first element
|
|
* *must* be a struct buf. We pass this
|
|
* structure to the I/O routines instead of a
|
|
* struct buf in order to be able to locate the
|
|
* high-level request when it completes.
|
|
*
|
|
* All offsets and lengths are in sectors.
|
|
*/
|
|
|
|
struct rqelement {
|
|
struct buf b; /* buf structure */
|
|
struct rqgroup *rqg; /* pointer to our group */
|
|
/* Information about the transfer */
|
|
daddr_t sdoffset; /* offset in subdisk */
|
|
int useroffset; /* offset in user buffer of normal data */
|
|
/*
|
|
* dataoffset and datalen refer to "individual" data
|
|
* transfers which involve only this drive (normal read,
|
|
* parityless write) and also degraded write.
|
|
*
|
|
* groupoffset and grouplen refer to the other "group"
|
|
* operations (normal write, recovery read) which involve
|
|
* more than one drive. Both the offsets are relative to
|
|
* the start of the local buffer.
|
|
*/
|
|
int dataoffset; /* offset in buffer of the normal data */
|
|
int groupoffset; /* offset in buffer of group data */
|
|
short datalen; /* length of normal data (sectors) */
|
|
short grouplen; /* length of group data (sectors) */
|
|
short buflen; /* total buffer length to allocate */
|
|
short flags; /* really enum xferinfo (see above) */
|
|
/* Ways to find other components */
|
|
short sdno; /* subdisk number */
|
|
short driveno; /* drive number */
|
|
};
|
|
|
|
/*
|
|
* A group of requests built to satisfy an I/O
|
|
* transfer on a single plex.
|
|
*/
|
|
struct rqgroup {
|
|
struct rqgroup *next; /* pointer to next group */
|
|
struct request *rq; /* pointer to the request */
|
|
short count; /* number of requests in this group */
|
|
short active; /* and number active */
|
|
short plexno; /* index of plex */
|
|
int badsdno; /* index of bad subdisk or -1 */
|
|
enum xferinfo flags; /* description of transfer */
|
|
struct rangelock *lock; /* lock for this transfer */
|
|
struct rqelement rqe[0]; /* and the elements of this request */
|
|
};
|
|
|
|
/*
|
|
* Describe one high-level request and the
|
|
* work we have to do to satisfy it.
|
|
*/
|
|
struct request {
|
|
struct buf *bp; /* pointer to the high-level request */
|
|
enum xferinfo flags;
|
|
union {
|
|
int volno; /* volume index */
|
|
int plexno; /* or plex index */
|
|
} volplex;
|
|
int error; /* current error indication */
|
|
int sdno; /* reviving subdisk (XFR_REVIVECONFLICT) */
|
|
short isplex; /* set if this is a plex request */
|
|
short active; /* number of subrequests still active */
|
|
struct rqgroup *rqg; /* pointer to the first group of requests */
|
|
struct rqgroup *lrqg; /* and to the last group of requests */
|
|
struct request *next; /* link of waiting requests */
|
|
};
|
|
|
|
/*
|
|
* Extended buffer header for subdisk I/O. Includes
|
|
* a pointer to the user I/O request.
|
|
*/
|
|
struct sdbuf {
|
|
struct buf b; /* our buffer */
|
|
struct buf *bp; /* and pointer to parent */
|
|
short driveno; /* drive index */
|
|
short sdno; /* and subdisk index */
|
|
};
|
|
|
|
/*
|
|
* Values returned by rqe and friends. Be careful
|
|
* with these: they are in order of increasing
|
|
* seriousness. Some routines check for
|
|
* > REQUEST_RECOVERED to indicate a failed request. XXX
|
|
*/
|
|
enum requeststatus {
|
|
REQUEST_OK, /* request built OK */
|
|
REQUEST_RECOVERED, /* request OK, but involves RAID5 recovery */
|
|
REQUEST_DEGRADED, /* parts of request failed */
|
|
REQUEST_EOF, /* parts of request failed: outside plex */
|
|
REQUEST_DOWN, /* all of request failed: subdisk(s) down */
|
|
REQUEST_ENOMEM /* all of request failed: ran out of memory */
|
|
};
|
|
|
|
#ifdef VINUMDEBUG
|
|
/* Trace entry for request info (DEBUG_LASTREQS) */
|
|
enum rqinfo_type {
|
|
loginfo_unused, /* never been used */
|
|
loginfo_user_bp, /* this is the bp when strategy is called */
|
|
loginfo_user_bpl, /* and this is the bp at launch time */
|
|
loginfo_rqe, /* user RQE */
|
|
loginfo_iodone, /* iodone */
|
|
loginfo_raid5_data, /* write RAID-5 data block */
|
|
loginfo_raid5_parity, /* write RAID-5 parity block */
|
|
loginfo_sdio, /* subdisk I/O */
|
|
loginfo_sdiol, /* subdisk I/O launch */
|
|
loginfo_sdiodone, /* subdisk iodone */
|
|
loginfo_lockwait, /* wait for range lock */
|
|
loginfo_lock, /* lock range */
|
|
loginfo_unlock, /* unlock range */
|
|
};
|
|
|
|
union rqinfou { /* info to pass to logrq */
|
|
struct buf *bp;
|
|
struct rqelement *rqe; /* address of request, for correlation */
|
|
struct rangelock *lockinfo;
|
|
};
|
|
|
|
struct rqinfo {
|
|
enum rqinfo_type type; /* kind of event */
|
|
struct timeval timestamp; /* time it happened */
|
|
struct buf *bp; /* point to user buffer */
|
|
int devmajor; /* major and minor device info */
|
|
int devminor;
|
|
union {
|
|
struct buf b; /* yup, the *whole* buffer header */
|
|
struct rqelement rqe; /* and the whole rqe */
|
|
struct rangelock lockinfo;
|
|
} info;
|
|
};
|
|
|
|
#define RQINFO_SIZE 128 /* number of info slots in buffer */
|
|
|
|
void logrq(enum rqinfo_type type, union rqinfou info, struct buf *ubp);
|
|
#endif
|
|
|
|
/* Structures for the daemon */
|
|
|
|
/* types of request to the daemon */
|
|
enum daemonrq {
|
|
daemonrq_none, /* dummy to catch bugs */
|
|
daemonrq_ioerror, /* error occurred on I/O */
|
|
daemonrq_saveconfig, /* save configuration */
|
|
daemonrq_return, /* return to userland */
|
|
daemonrq_ping, /* show sign of life */
|
|
daemonrq_init, /* initialize a plex */
|
|
daemonrq_revive, /* revive a subdisk */
|
|
daemonrq_closedrive, /* close a drive */
|
|
};
|
|
|
|
/* info field for daemon requests */
|
|
union daemoninfo { /* and the request information */
|
|
struct request *rq; /* for daemonrq_ioerror */
|
|
struct sd *sd; /* for daemonrq_revive */
|
|
struct plex *plex; /* for daemonrq_init */
|
|
struct drive *drive; /* for daemonrq_closedrive */
|
|
int nothing; /* for passing NULL */
|
|
};
|
|
|
|
struct daemonq {
|
|
struct daemonq *next; /* pointer to next element in queue */
|
|
enum daemonrq type; /* type of request */
|
|
int privateinuse; /* private element, being used */
|
|
union daemoninfo info; /* and the request information */
|
|
};
|
|
|
|
void queue_daemon_request(enum daemonrq type, union daemoninfo info);
|
|
|
|
extern int daemon_options;
|
|
|
|
enum daemon_option {
|
|
daemon_verbose = 1, /* talk about what we're doing */
|
|
daemon_stopped = 2,
|
|
daemon_noupdate = 4, /* don't update the disk config, for recovery */
|
|
};
|
|
|
|
void freerq(struct request *rq);
|
|
void unlockrange(int plexno, struct rangelock *);
|
|
/* Local Variables: */
|
|
/* fill-column: 50 */
|
|
/* End: */
|