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984e8b9ada
solve some of the elusive panics we have seen with corrupted buffer headers (specifically the zeroed-out b_iodone field). Submitted-by: Bernd Walter <ticso@cicely.de>
258 lines
10 KiB
C
258 lines
10 KiB
C
/*-
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* Copyright (c) 1997, 1998
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* Nan Yang Computer Services Limited. All rights reserved.
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*
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* This software is distributed under the so-called ``Berkeley
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* License'':
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Nan Yang Computer
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* Services Limited.
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* 4. Neither the name of the Company nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* This software is provided ``as is'', and any express or implied
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* warranties, including, but not limited to, the implied warranties of
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* merchantability and fitness for a particular purpose are disclaimed.
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* In no event shall the company or contributors be liable for any
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* direct, indirect, incidental, special, exemplary, or consequential
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* damages (including, but not limited to, procurement of substitute
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* goods or services; loss of use, data, or profits; or business
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* interruption) however caused and on any theory of liability, whether
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* in contract, strict liability, or tort (including negligence or
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* otherwise) arising in any way out of the use of this software, even if
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* advised of the possibility of such damage.
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*
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* $Id: request.h,v 1.17 1999/12/27 02:18:05 grog Exp grog $
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* $FreeBSD$
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*/
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/* Information needed to set up a transfer */
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enum xferinfo {
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XFR_NORMAL_READ = 1,
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XFR_NORMAL_WRITE = 2, /* write request in normal mode */
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XFR_RECOVERY_READ = 4,
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XFR_DEGRADED_WRITE = 8,
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XFR_PARITYLESS_WRITE = 0x10,
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XFR_NO_PARITY_STRIPE = 0x20, /* parity stripe is not available */
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XFR_DATA_BLOCK = 0x40, /* data block in request */
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XFR_PARITY_BLOCK = 0x80, /* parity block in request */
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XFR_BAD_SUBDISK = 0x100, /* this subdisk is dead */
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XFR_MALLOCED = 0x200, /* this buffer is malloced */
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#if VINUMDEBUG
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XFR_PHASE2 = 0x800, /* documentation only: 2nd phase write */
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#endif
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XFR_REVIVECONFLICT = 0x1000, /* possible conflict with a revive operation */
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/* operations that need a parity block */
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XFR_PARITYOP = (XFR_NORMAL_WRITE | XFR_RECOVERY_READ | XFR_DEGRADED_WRITE),
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/* operations that use the group parameters */
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XFR_GROUPOP = (XFR_DEGRADED_WRITE | XFR_RECOVERY_READ),
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/* operations that that use the data parameters */
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XFR_DATAOP = (XFR_NORMAL_READ | XFR_NORMAL_WRITE | XFR_PARITYLESS_WRITE),
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/* operations requiring read before write */
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XFR_RBW = (XFR_NORMAL_WRITE | XFR_DEGRADED_WRITE),
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/* operations that need a malloced buffer */
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XFR_NEEDS_MALLOC = (XFR_NORMAL_WRITE | XFR_RECOVERY_READ | XFR_DEGRADED_WRITE)
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};
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/*
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* Describe one low-level request, part of a
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* high-level request. This is an extended
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* struct buf buffer, and the first element
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* *must* be a struct buf. We pass this
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* structure to the I/O routines instead of a
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* struct buf in order to be able to locate the
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* high-level request when it completes.
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*
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* All offsets and lengths are in sectors.
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*/
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struct rqelement {
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struct buf b; /* buf structure */
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struct rqgroup *rqg; /* pointer to our group */
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/* Information about the transfer */
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daddr_t sdoffset; /* offset in subdisk */
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int useroffset; /* offset in user buffer of normal data */
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/*
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* dataoffset and datalen refer to "individual" data
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* transfers which involve only this drive (normal read,
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* parityless write) and also degraded write.
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*
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* groupoffset and grouplen refer to the other "group"
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* operations (normal write, recovery read) which involve
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* more than one drive. Both the offsets are relative to
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* the start of the local buffer.
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*/
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int dataoffset; /* offset in buffer of the normal data */
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int groupoffset; /* offset in buffer of group data */
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short datalen; /* length of normal data (sectors) */
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short grouplen; /* length of group data (sectors) */
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short buflen; /* total buffer length to allocate */
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short flags; /* really enum xferinfo (see above) */
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/* Ways to find other components */
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short sdno; /* subdisk number */
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short driveno; /* drive number */
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};
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/*
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* A group of requests built to satisfy an I/O
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* transfer on a single plex.
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*/
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struct rqgroup {
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struct rqgroup *next; /* pointer to next group */
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struct request *rq; /* pointer to the request */
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short count; /* number of requests in this group */
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short active; /* and number active */
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short plexno; /* index of plex */
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int badsdno; /* index of bad subdisk or -1 */
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enum xferinfo flags; /* description of transfer */
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struct rangelock *lock; /* lock for this transfer */
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daddr_t lockbase; /* and lock address */
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struct rqelement rqe[0]; /* and the elements of this request */
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};
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/*
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* Describe one high-level request and the
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* work we have to do to satisfy it.
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*/
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struct request {
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struct buf *bp; /* pointer to the high-level request */
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enum xferinfo flags;
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union {
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int volno; /* volume index */
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int plexno; /* or plex index */
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} volplex;
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int error; /* current error indication */
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int sdno; /* reviving subdisk (XFR_REVIVECONFLICT) */
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short isplex; /* set if this is a plex request */
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short active; /* number of subrequests still active */
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struct rqgroup *rqg; /* pointer to the first group of requests */
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struct rqgroup *lrqg; /* and to the last group of requests */
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struct request *next; /* link of waiting requests */
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};
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/*
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* Extended buffer header for subdisk I/O. Includes
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* a pointer to the user I/O request.
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*/
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struct sdbuf {
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struct buf b; /* our buffer */
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struct buf *bp; /* and pointer to parent */
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short driveno; /* drive index */
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short sdno; /* and subdisk index */
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};
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/*
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* Values returned by rqe and friends. Be careful
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* with these: they are in order of increasing
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* seriousness. Some routines check for
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* > REQUEST_RECOVERED to indicate a failed request. XXX
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*/
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enum requeststatus {
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REQUEST_OK, /* request built OK */
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REQUEST_RECOVERED, /* request OK, but involves RAID5 recovery */
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REQUEST_DEGRADED, /* parts of request failed */
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REQUEST_EOF, /* parts of request failed: outside plex */
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REQUEST_DOWN, /* all of request failed: subdisk(s) down */
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REQUEST_ENOMEM /* all of request failed: ran out of memory */
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};
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#ifdef VINUMDEBUG
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/* Trace entry for request info (DEBUG_LASTREQS) */
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enum rqinfo_type {
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loginfo_unused, /* never been used */
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loginfo_user_bp, /* this is the bp when strategy is called */
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loginfo_user_bpl, /* and this is the bp at launch time */
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loginfo_rqe, /* user RQE */
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loginfo_iodone, /* iodone */
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loginfo_raid5_data, /* write RAID-5 data block */
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loginfo_raid5_parity, /* write RAID-5 parity block */
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loginfo_sdio, /* subdisk I/O */
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loginfo_sdiol, /* subdisk I/O launch */
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loginfo_sdiodone, /* subdisk iodone */
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loginfo_lockwait, /* wait for range lock */
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loginfo_lock, /* lock range */
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loginfo_unlock, /* unlock range */
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};
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union rqinfou { /* info to pass to logrq */
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struct buf *bp;
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struct rqelement *rqe; /* address of request, for correlation */
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struct rangelock *lockinfo;
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};
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struct rqinfo {
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enum rqinfo_type type; /* kind of event */
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struct timeval timestamp; /* time it happened */
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struct buf *bp; /* point to user buffer */
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int devmajor; /* major and minor device info */
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int devminor;
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union {
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struct buf b; /* yup, the *whole* buffer header */
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struct rqelement rqe; /* and the whole rqe */
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struct rangelock lockinfo;
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} info;
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};
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#define RQINFO_SIZE 128 /* number of info slots in buffer */
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void logrq(enum rqinfo_type type, union rqinfou info, struct buf *ubp);
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#endif
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/* Structures for the daemon */
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/* types of request to the daemon */
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enum daemonrq {
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daemonrq_none, /* dummy to catch bugs */
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daemonrq_ioerror, /* error occurred on I/O */
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daemonrq_saveconfig, /* save configuration */
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daemonrq_return, /* return to userland */
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daemonrq_ping, /* show sign of life */
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daemonrq_init, /* initialize a plex */
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daemonrq_revive, /* revive a subdisk */
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daemonrq_closedrive, /* close a drive */
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};
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/* info field for daemon requests */
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union daemoninfo { /* and the request information */
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struct request *rq; /* for daemonrq_ioerror */
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struct sd *sd; /* for daemonrq_revive */
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struct plex *plex; /* for daemonrq_init */
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struct drive *drive; /* for daemonrq_closedrive */
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int nothing; /* for passing NULL */
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};
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struct daemonq {
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struct daemonq *next; /* pointer to next element in queue */
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enum daemonrq type; /* type of request */
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int privateinuse; /* private element, being used */
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union daemoninfo info; /* and the request information */
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};
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void queue_daemon_request(enum daemonrq type, union daemoninfo info);
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extern int daemon_options;
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enum daemon_option {
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daemon_verbose = 1, /* talk about what we're doing */
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daemon_stopped = 2,
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daemon_noupdate = 4, /* don't update the disk config, for recovery */
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};
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void freerq(struct request *rq);
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void unlockrange(int plexno, struct rangelock *);
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/* Local Variables: */
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/* fill-column: 50 */
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/* End: */
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