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 g_geom *gp; 63 struct gv_volume *v; 64 struct gv_plex *p, *lp; 65 int numwrites; 66 67 gp = sc->geom; 68 v = bp->bio_to->private; 69 if (v == NULL || v->state != GV_VOL_UP) { 70 g_io_deliver(bp, ENXIO); 71 return; 72 } 73 74 switch (bp->bio_cmd) { 75 case BIO_READ: 76 /* 77 * Try to find a good plex where we can send the request to, 78 * round-robin-style. The plex either has to be up, or it's a 79 * degraded RAID5 plex. Check if we have delayed requests. Put 80 * this request on the delayed queue if so. This makes sure that 81 * we don't read old values. 82 */ 83 if (bioq_first(v->wqueue) != NULL) { 84 bioq_insert_tail(v->wqueue, bp); 85 break; 86 } 87 lp = v->last_read_plex; 88 if (lp == NULL) 89 lp = LIST_FIRST(&v->plexes); 90 p = LIST_NEXT(lp, in_volume); 91 if (p == NULL) 92 p = LIST_FIRST(&v->plexes); 93 do { 94 if (p == NULL) { 95 p = lp; 96 break; 97 } 98 if ((p->state > GV_PLEX_DEGRADED) || 99 (p->state >= GV_PLEX_DEGRADED && 100 p->org == GV_PLEX_RAID5)) 101 break; 102 p = LIST_NEXT(p, in_volume); 103 if (p == NULL) 104 p = LIST_FIRST(&v->plexes); 105 } while (p != lp); 106 107 if ((p == NULL) || 108 (p->org == GV_PLEX_RAID5 && p->state < GV_PLEX_DEGRADED) || 109 (p->org != GV_PLEX_RAID5 && p->state <= GV_PLEX_DEGRADED)) { 110 g_io_deliver(bp, ENXIO); 111 return; 112 } 113 v->last_read_plex = p; 114 115 /* Hand it down to the plex logic. */ 116 gv_plex_start(p, bp); 117 break; 118 119 case BIO_WRITE: 120 case BIO_DELETE: 121 /* Delay write-requests if any plex is synchronizing. */ 122 LIST_FOREACH(p, &v->plexes, in_volume) { 123 if (p->flags & GV_PLEX_SYNCING) { 124 bioq_insert_tail(v->wqueue, bp); 125 return; 126 } 127 } 128 129 numwrites = 0; 130 /* Give the BIO to each plex of this volume. */ 131 LIST_FOREACH(p, &v->plexes, in_volume) { 132 if (p->state < GV_PLEX_DEGRADED) 133 continue; 134 gv_plex_start(p, bp); 135 numwrites++; 136 } 137 if (numwrites == 0) 138 g_io_deliver(bp, ENXIO); 139 break; 140 } 141 } 142 143 void 144 gv_bio_done(struct gv_softc *sc, struct bio *bp) 145 { 146 struct gv_volume *v; 147 struct gv_plex *p; 148 struct gv_sd *s; 149 150 s = bp->bio_caller1; 151 KASSERT(s != NULL, ("gv_bio_done: NULL s")); 152 p = s->plex_sc; 153 KASSERT(p != NULL, ("gv_bio_done: NULL p")); 154 v = p->vol_sc; 155 KASSERT(v != NULL, ("gv_bio_done: NULL v")); 156 157 switch (p->org) { 158 case GV_PLEX_CONCAT: 159 case GV_PLEX_STRIPED: 160 gv_plex_normal_done(p, bp); 161 break; 162 case GV_PLEX_RAID5: 163 gv_plex_raid5_done(p, bp); 164 break; 165 } 166 167 gv_drive_done(s->drive_sc); 168 } 169