/*- * 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. */ /* * This file gets read by makestatetext to create text files * with the names of the states, so don't change the file * format */ enum volumestate { /* present but unused. Must be 0 */ volume_unallocated, /* mentioned elsewhere but not known to the configuration */ volume_uninit, volume_down, /* * The volume is up and functional, but not all * plexes may be available */ volume_up, /* last value, for table dimensions */ volume_laststate = volume_up }; enum plexstate { /* An empty entry, not a plex at all. */ plex_unallocated, /* The plex has been referenced by a volume */ plex_referenced, /* * The plex has been allocated, but there configuration * is not complete */ plex_init, /* * A plex which has gone completely down because of * I/O errors. */ plex_faulty, /* * A plex which has been taken down by the * administrator. */ plex_down, /* A plex which is being initialized */ plex_initializing, /* * *** The remaining states represent plexes which are * at least partially up. Keep these separate so that * they can be checked more easily. */ /* * A plex entry which is at least partially up. Not * all subdisks are available, and an inconsistency * has occurred. If no other plex is uncorrupted, * the volume is no longer consistent. */ plex_corrupt, /* first "up" state */ plex_firstup = plex_corrupt, /* * A RAID-5 plex entry which is accessible, but one * subdisk is down, requiring recovery for many * I/O requests. */ plex_degraded, /* * A plex which is really up, but which has a reborn * subdisk which we don't completely trust, and * which we don't want to read if we can avoid it */ plex_flaky, /* * A plex entry which is completely up. All subdisks * are up. */ plex_up, /* last value, for table dimensions */ plex_laststate = plex_up }; /* * subdisk states */ enum sdstate { /* An empty entry, not a subdisk at all. */ sd_unallocated, /* * A subdisk entry which has not been created * completely. Some fields may be empty. */ sd_uninit, /* The subdisk has been referenced by a plex */ sd_referenced, /* * A subdisk entry which has been created completely. * All fields are correct, but the disk hasn't * been updated. */ sd_init, /* * A subdisk entry which has been created completely. * All fields are correct, and the disk has been * updated, but there is no data on the disk. */ sd_empty, /* * A subdisk entry which has been created completely and * which is currently being initialized */ sd_initializing, /* * A subdisk entry which has been initialized, * but which can't come up because it would * cause inconsistencies. */ sd_initialized, /* *** The following states represent invalid data */ /* * A subdisk entry which has been created completely. * All fields are correct, the config on disk has been * updated, and the data was valid, but since then the * drive has been taken down, and as a result updates * have been missed. */ sd_obsolete, /* * A subdisk entry which has been created completely. * All fields are correct, the disk has been updated, * and the data was valid, but since then the drive * has been crashed and updates have been lost. */ sd_stale, /* *** The following states represent valid, inaccessible data */ /* * A subdisk entry which has been created completely. * All fields are correct, the disk has been updated, * and the data was valid, but since then the drive * has gone down. No attempt has been made to write * to the subdisk since the crash, so the data is valid. */ sd_crashed, /* * A subdisk entry which was up, which contained * valid data, and which was taken down by the * administrator. The data is valid. */ sd_down, /* * *** This is invalid data (the subdisk previously had * a numerically lower state), but it is currently in the * process of being revived. We can write but not read. */ sd_reviving, /* * *** The following states represent accessible subdisks * with valid data */ /* * A subdisk entry which has been created completely. * All fields are correct, the disk has been updated, * and the data was valid, but since then the drive * has gone down and up again. No updates were lost, * but it is possible that the subdisk has been * damaged. We won't read from this subdisk if we * have a choice. If this is the only subdisk which * covers this address space in the plex, we set its * state to sd_up under these circumstances, so this * status implies that there is another subdisk to * fulfil the request. */ sd_reborn, /* * A subdisk entry which has been created completely. * All fields are correct, the disk has been updated, * and the data is valid. */ sd_up, /* last value, for table dimensions */ sd_laststate = sd_up }; enum drivestate { /* present but unused. Must be 0 */ drive_unallocated, /* just mentioned in some other config entry */ drive_referenced, /* not accessible */ drive_down, /* up and running */ drive_up, /* last value, for table dimensions */ drive_laststate = drive_up };
