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Diffstat (limited to 'lkm/vinum/request.h')
| -rw-r--r-- | lkm/vinum/request.h | 191 |
1 files changed, 0 insertions, 191 deletions
diff --git a/lkm/vinum/request.h b/lkm/vinum/request.h deleted file mode 100644 index 6575204..0000000 --- a/lkm/vinum/request.h +++ /dev/null @@ -1,191 +0,0 @@ -/*- - * 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 1.10 1998/08/03 07:15:26 grog Exp grog $ - */ - -/* Information needed to set up a transfer */ - -/* struct buf is surprisingly big (about 300 - * bytes), and it's part of the request, so this - * value is really important. Most requests - * don't need more than 2 subrequests per - * plex. The table is automatically extended if - * this value is too small. */ -#define RQELTS 2 /* default of 2 requests per 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 DEBUG - 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 oder - * to be able to locate the high-level request when it - * completes. - * - * All offsets and lengths are in "blocks", i.e. 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 (normal read, parityless write) - * and also degraded write. - * - * groupoffset and grouplen refer to the other - * "group" operations (normal write, recovery read) - * 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 a certain - * component of a user request */ -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 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 */ - int flags; - union { - int volno; /* volume index */ - int plexno; /* or plex index */ - } volplex; - int error; /* current error indication */ - 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 first 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 completely failed request. */ -enum requeststatus { - REQUEST_OK, /* request built OK */ - REQUEST_RECOVERED, /* request OK, but involves RAID5 recovery */ - REQUEST_EOF, /* request failed: outside plex */ - REQUEST_DOWN, /* request failed: subdisk down */ - REQUEST_ENOMEM /* ran out of memory */ -}; - -#ifdef DEBUG -/* 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 */ -}; - -union rqinfou { /* info to pass to logrq */ - struct buf *bp; - struct rqelement *rqe; /* address of request, for correlation */ -}; - -struct rqinfo { - enum rqinfo_type type; /* kind of event */ - struct timeval timestamp; /* time it happened */ - struct buf *bp; /* point to user buffer */ - union { - struct buf b; /* yup, the *whole* buffer header */ - struct rqelement rqe; /* and the whole rqe */ - } info; -}; - -#define RQINFO_SIZE 64 /* number of info slots in buffer */ - -void logrq(enum rqinfo_type type, union rqinfou info, struct buf *ubp); -#endif |
