1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2007 Lukas Ertl 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/bio.h> 34 #include <sys/lock.h> 35 #include <sys/malloc.h> 36 #include <sys/systm.h> 37 38 #include <geom/geom.h> 39 #include <geom/vinum/geom_vinum_var.h> 40 #include <geom/vinum/geom_vinum.h> 41 42 void 43 gv_volume_flush(struct gv_volume *v) 44 { 45 struct gv_softc *sc; 46 struct bio *bp; 47 48 KASSERT(v != NULL, ("NULL v")); 49 sc = v->vinumconf; 50 KASSERT(sc != NULL, ("NULL sc")); 51 52 bp = bioq_takefirst(v->wqueue); 53 while (bp != NULL) { 54 gv_volume_start(sc, bp); 55 bp = bioq_takefirst(v->wqueue); 56 } 57 } 58 59 void 60 gv_volume_start(struct gv_softc *sc, struct bio *bp) 61 { 62 struct gv_volume *v; 63 struct gv_plex *p, *lp; 64 int numwrites; 65 66 v = bp->bio_to->private; 67 if (v == NULL || v->state != GV_VOL_UP) { 68 g_io_deliver(bp, ENXIO); 69 return; 70 } 71 72 switch (bp->bio_cmd) { 73 case BIO_READ: 74 /* 75 * Try to find a good plex where we can send the request to, 76 * round-robin-style. The plex either has to be up, or it's a 77 * degraded RAID5 plex. Check if we have delayed requests. Put 78 * this request on the delayed queue if so. This makes sure that 79 * we don't read old values. 80 */ 81 if (bioq_first(v->wqueue) != NULL) { 82 bioq_insert_tail(v->wqueue, bp); 83 break; 84 } 85 lp = v->last_read_plex; 86 if (lp == NULL) 87 lp = LIST_FIRST(&v->plexes); 88 p = LIST_NEXT(lp, in_volume); 89 if (p == NULL) 90 p = LIST_FIRST(&v->plexes); 91 do { 92 if (p == NULL) { 93 p = lp; 94 break; 95 } 96 if ((p->state > GV_PLEX_DEGRADED) || 97 (p->state >= GV_PLEX_DEGRADED && 98 p->org == GV_PLEX_RAID5)) 99 break; 100 p = LIST_NEXT(p, in_volume); 101 if (p == NULL) 102 p = LIST_FIRST(&v->plexes); 103 } while (p != lp); 104 105 if ((p == NULL) || 106 (p->org == GV_PLEX_RAID5 && p->state < GV_PLEX_DEGRADED) || 107 (p->org != GV_PLEX_RAID5 && p->state <= GV_PLEX_DEGRADED)) { 108 g_io_deliver(bp, ENXIO); 109 return; 110 } 111 v->last_read_plex = p; 112 113 /* Hand it down to the plex logic. */ 114 gv_plex_start(p, bp); 115 break; 116 117 case BIO_WRITE: 118 case BIO_DELETE: 119 /* Delay write-requests if any plex is synchronizing. */ 120 LIST_FOREACH(p, &v->plexes, in_volume) { 121 if (p->flags & GV_PLEX_SYNCING) { 122 bioq_insert_tail(v->wqueue, bp); 123 return; 124 } 125 } 126 127 numwrites = 0; 128 /* Give the BIO to each plex of this volume. */ 129 LIST_FOREACH(p, &v->plexes, in_volume) { 130 if (p->state < GV_PLEX_DEGRADED) 131 continue; 132 gv_plex_start(p, bp); 133 numwrites++; 134 } 135 if (numwrites == 0) 136 g_io_deliver(bp, ENXIO); 137 break; 138 } 139 } 140 141 void 142 gv_bio_done(struct gv_softc *sc, struct bio *bp) 143 { 144 struct gv_volume *v __diagused; 145 struct gv_plex *p; 146 struct gv_sd *s; 147 148 s = bp->bio_caller1; 149 KASSERT(s != NULL, ("gv_bio_done: NULL s")); 150 p = s->plex_sc; 151 KASSERT(p != NULL, ("gv_bio_done: NULL p")); 152 v = p->vol_sc; 153 KASSERT(v != NULL, ("gv_bio_done: NULL v")); 154 155 switch (p->org) { 156 case GV_PLEX_CONCAT: 157 case GV_PLEX_STRIPED: 158 gv_plex_normal_done(p, bp); 159 break; 160 case GV_PLEX_RAID5: 161 gv_plex_raid5_done(p, bp); 162 break; 163 } 164 165 gv_drive_done(s->drive_sc); 166 } 167