Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/vinum/request.h
Version:
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1 /*- 2 * Copyright (c) 1997, 1998 3 * Nan Yang Computer Services Limited. All rights reserved. 4 * 5 * This software is distributed under the so-called ``Berkeley 6 * License'': 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Nan Yang Computer 19 * Services Limited. 20 * 4. Neither the name of the Company nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * This software is provided ``as is'', and any express or implied 25 * warranties, including, but not limited to, the implied warranties of 26 * merchantability and fitness for a particular purpose are disclaimed. 27 * In no event shall the company or contributors be liable for any 28 * direct, indirect, incidental, special, exemplary, or consequential 29 * damages (including, but not limited to, procurement of substitute 30 * goods or services; loss of use, data, or profits; or business 31 * interruption) however caused and on any theory of liability, whether 32 * in contract, strict liability, or tort (including negligence or 33 * otherwise) arising in any way out of the use of this software, even if 34 * advised of the possibility of such damage. 35 * 36 * $Id: request.h,v 1.18 2000/05/07 04:05:33 grog Exp grog $ 37 * $FreeBSD$ 38 */ 39 40 /* Information needed to set up a transfer */ 41 42 enum xferinfo { 43 XFR_NORMAL_READ = 1, 44 XFR_NORMAL_WRITE = 2, /* write request in normal mode */ 45 XFR_RECOVERY_READ = 4, 46 XFR_DEGRADED_WRITE = 8, 47 XFR_PARITYLESS_WRITE = 0x10, 48 XFR_NO_PARITY_STRIPE = 0x20, /* parity stripe is not available */ 49 XFR_DATA_BLOCK = 0x40, /* data block in request */ 50 XFR_PARITY_BLOCK = 0x80, /* parity block in request */ 51 XFR_BAD_SUBDISK = 0x100, /* this subdisk is dead */ 52 XFR_MALLOCED = 0x200, /* this buffer is malloced */ 53 #if VINUMDEBUG 54 XFR_PHASE2 = 0x800, /* documentation only: 2nd phase write */ 55 #endif 56 XFR_REVIVECONFLICT = 0x1000, /* possible conflict with a revive operation */ 57 /* operations that need a parity block */ 58 XFR_PARITYOP = (XFR_NORMAL_WRITE | XFR_RECOVERY_READ | XFR_DEGRADED_WRITE), 59 /* operations that use the group parameters */ 60 XFR_GROUPOP = (XFR_DEGRADED_WRITE | XFR_RECOVERY_READ), 61 /* operations that that use the data parameters */ 62 XFR_DATAOP = (XFR_NORMAL_READ | XFR_NORMAL_WRITE | XFR_PARITYLESS_WRITE), 63 /* operations requiring read before write */ 64 XFR_RBW = (XFR_NORMAL_WRITE | XFR_DEGRADED_WRITE), 65 /* operations that need a malloced buffer */ 66 XFR_NEEDS_MALLOC = (XFR_NORMAL_WRITE | XFR_RECOVERY_READ | XFR_DEGRADED_WRITE) 67 }; 68 69 /* 70 * Describe one low-level request, part of a 71 * high-level request. This is an extended 72 * struct buf buffer, and the first element 73 * *must* be a struct buf. We pass this 74 * structure to the I/O routines instead of a 75 * struct buf in order to be able to locate the 76 * high-level request when it completes. 77 * 78 * All offsets and lengths are in sectors. 79 */ 80 81 struct rqelement { 82 struct buf b; /* buf structure */ 83 struct rqgroup *rqg; /* pointer to our group */ 84 /* Information about the transfer */ 85 daddr_t sdoffset; /* offset in subdisk */ 86 int useroffset; /* offset in user buffer of normal data */ 87 /* 88 * dataoffset and datalen refer to "individual" data 89 * transfers which involve only this drive (normal read, 90 * parityless write) and also degraded write. 91 * 92 * groupoffset and grouplen refer to the other "group" 93 * operations (normal write, recovery read) which involve 94 * more than one drive. Both the offsets are relative to 95 * the start of the local buffer. 96 */ 97 int dataoffset; /* offset in buffer of the normal data */ 98 int groupoffset; /* offset in buffer of group data */ 99 short datalen; /* length of normal data (sectors) */ 100 short grouplen; /* length of group data (sectors) */ 101 short buflen; /* total buffer length to allocate */ 102 short flags; /* really enum xferinfo (see above) */ 103 /* Ways to find other components */ 104 short sdno; /* subdisk number */ 105 short driveno; /* drive number */ 106 }; 107 108 /* 109 * A group of requests built to satisfy an I/O 110 * transfer on a single plex. 111 */ 112 struct rqgroup { 113 struct rqgroup *next; /* pointer to next group */ 114 struct request *rq; /* pointer to the request */ 115 short count; /* number of requests in this group */ 116 short active; /* and number active */ 117 short plexno; /* index of plex */ 118 int badsdno; /* index of bad subdisk or -1 */ 119 enum xferinfo flags; /* description of transfer */ 120 struct rangelock *lock; /* lock for this transfer */ 121 daddr_t lockbase; /* and lock address */ 122 struct rqelement rqe[0]; /* and the elements of this request */ 123 }; 124 125 /* 126 * Describe one high-level request and the 127 * work we have to do to satisfy it. 128 */ 129 struct request { 130 struct buf *bp; /* pointer to the high-level request */ 131 enum xferinfo flags; 132 union { 133 int volno; /* volume index */ 134 int plexno; /* or plex index */ 135 } volplex; 136 int error; /* current error indication */ 137 int sdno; /* reviving subdisk (XFR_REVIVECONFLICT) */ 138 short isplex; /* set if this is a plex request */ 139 short active; /* number of subrequests still active */ 140 struct rqgroup *rqg; /* pointer to the first group of requests */ 141 struct rqgroup *lrqg; /* and to the last group of requests */ 142 struct request *next; /* link of waiting requests */ 143 }; 144 145 /* 146 * Extended buffer header for subdisk I/O. Includes 147 * a pointer to the user I/O request. 148 */ 149 struct sdbuf { 150 struct buf b; /* our buffer */ 151 struct buf *bp; /* and pointer to parent */ 152 short driveno; /* drive index */ 153 short sdno; /* and subdisk index */ 154 }; 155 156 /* 157 * Values returned by rqe and friends. Be careful 158 * with these: they are in order of increasing 159 * seriousness. Some routines check for 160 * > REQUEST_RECOVERED to indicate a failed request. XXX 161 */ 162 enum requeststatus { 163 REQUEST_OK, /* request built OK */ 164 REQUEST_RECOVERED, /* request OK, but involves RAID5 recovery */ 165 REQUEST_DEGRADED, /* parts of request failed */ 166 REQUEST_EOF, /* parts of request failed: outside plex */ 167 REQUEST_DOWN, /* all of request failed: subdisk(s) down */ 168 REQUEST_ENOMEM /* all of request failed: ran out of memory */ 169 }; 170 171 #ifdef VINUMDEBUG 172 /* Trace entry for request info (DEBUG_LASTREQS) */ 173 enum rqinfo_type { 174 loginfo_unused, /* never been used */ 175 loginfo_user_bp, /* this is the bp when strategy is called */ 176 loginfo_user_bpl, /* and this is the bp at launch time */ 177 loginfo_rqe, /* user RQE */ 178 loginfo_iodone, /* iodone */ 179 loginfo_raid5_data, /* write RAID-5 data block */ 180 loginfo_raid5_parity, /* write RAID-5 parity block */ 181 loginfo_sdio, /* subdisk I/O */ 182 loginfo_sdiol, /* subdisk I/O launch */ 183 loginfo_sdiodone, /* subdisk iodone */ 184 loginfo_lockwait, /* wait for range lock */ 185 loginfo_lock, /* lock range */ 186 loginfo_unlock, /* unlock range */ 187 }; 188 189 union rqinfou { /* info to pass to logrq */ 190 struct buf *bp; 191 struct rqelement *rqe; /* address of request, for correlation */ 192 struct rangelock *lockinfo; 193 }; 194 195 struct rqinfo { 196 enum rqinfo_type type; /* kind of event */ 197 struct timeval timestamp; /* time it happened */ 198 struct buf *bp; /* point to user buffer */ 199 int devmajor; /* major and minor device info */ 200 int devminor; 201 union { 202 struct buf b; /* yup, the *whole* buffer header */ 203 struct rqelement rqe; /* and the whole rqe */ 204 struct rangelock lockinfo; 205 } info; 206 }; 207 208 #define RQINFO_SIZE 128 /* number of info slots in buffer */ 209 210 void logrq(enum rqinfo_type type, union rqinfou info, struct buf *ubp); 211 #endif 212 213 /* Structures for the daemon */ 214 215 /* types of request to the daemon */ 216 enum daemonrq { 217 daemonrq_none, /* dummy to catch bugs */ 218 daemonrq_ioerror, /* error occurred on I/O */ 219 daemonrq_saveconfig, /* save configuration */ 220 daemonrq_return, /* return to userland */ 221 daemonrq_ping, /* show sign of life */ 222 daemonrq_init, /* initialize a plex */ 223 daemonrq_revive, /* revive a subdisk */ 224 daemonrq_closedrive, /* close a drive */ 225 }; 226 227 /* info field for daemon requests */ 228 union daemoninfo { /* and the request information */ 229 struct request *rq; /* for daemonrq_ioerror */ 230 struct sd *sd; /* for daemonrq_revive */ 231 struct plex *plex; /* for daemonrq_init */ 232 struct drive *drive; /* for daemonrq_closedrive */ 233 int nothing; /* for passing NULL */ 234 }; 235 236 struct daemonq { 237 struct daemonq *next; /* pointer to next element in queue */ 238 enum daemonrq type; /* type of request */ 239 int privateinuse; /* private element, being used */ 240 union daemoninfo info; /* and the request information */ 241 }; 242 243 void queue_daemon_request(enum daemonrq type, union daemoninfo info); 244 245 extern int daemon_options; 246 247 enum daemon_option { 248 daemon_verbose = 1, /* talk about what we're doing */ 249 daemon_stopped = 2, 250 daemon_noupdate = 4, /* don't update the disk config, for recovery */ 251 }; 252 253 void freerq(struct request *rq); 254 void unlockrange(int plexno, struct rangelock *); 255 /* Local Variables: */ 256 /* fill-column: 50 */ 257 /* End: */
Cache object: aada4c7a2daa64f54eb060a34d53ac78
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