1 /*- 2 * Copyright (c) 2004 Poul-Henning Kamp 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/bio.h> 33 #include <sys/kernel.h> 34 #include <sys/malloc.h> 35 #include <sys/vnode.h> 36 #include <sys/mount.h> /* XXX Temporary for VFS_LOCK_GIANT */ 37 38 #include <geom/geom.h> 39 #include <geom/geom_vfs.h> 40 41 /* 42 * subroutines for use by filesystems. 43 * 44 * XXX: should maybe live somewhere else ? 45 */ 46 #include <sys/buf.h> 47 48 static struct buf_ops __g_vfs_bufops = { 49 .bop_name = "GEOM_VFS", 50 .bop_write = bufwrite, 51 .bop_strategy = g_vfs_strategy, 52 .bop_sync = bufsync, 53 .bop_bdflush = bufbdflush 54 }; 55 56 struct buf_ops *g_vfs_bufops = &__g_vfs_bufops; 57 58 static g_orphan_t g_vfs_orphan; 59 60 static struct g_class g_vfs_class = { 61 .name = "VFS", 62 .version = G_VERSION, 63 .orphan = g_vfs_orphan, 64 }; 65 66 DECLARE_GEOM_CLASS(g_vfs_class, g_vfs); 67 68 static void 69 g_vfs_done(struct bio *bip) 70 { 71 struct buf *bp; 72 int vfslocked; 73 74 /* 75 * Provider ('bio_to') could have withered away sometime 76 * between incrementing the 'nend' in g_io_deliver() and now, 77 * making 'bio_to' a dangling pointer. We cannot do that 78 * in g_wither_geom(), as it would require going over 79 * the 'g_bio_run_up' list, resetting the pointer. 80 */ 81 if (bip->bio_from->provider == NULL) 82 bip->bio_to = NULL; 83 84 if (bip->bio_error) { 85 printf("g_vfs_done():"); 86 g_print_bio(bip); 87 printf("error = %d\n", bip->bio_error); 88 } 89 bp = bip->bio_caller2; 90 bp->b_error = bip->bio_error; 91 bp->b_ioflags = bip->bio_flags; 92 if (bip->bio_error) 93 bp->b_ioflags |= BIO_ERROR; 94 bp->b_resid = bp->b_bcount - bip->bio_completed; 95 g_destroy_bio(bip); 96 vfslocked = VFS_LOCK_GIANT(((struct mount *)NULL)); 97 bufdone(bp); 98 VFS_UNLOCK_GIANT(vfslocked); 99 } 100 101 void 102 g_vfs_strategy(struct bufobj *bo, struct buf *bp) 103 { 104 struct g_consumer *cp; 105 struct bio *bip; 106 int vfslocked; 107 108 cp = bo->bo_private; 109 G_VALID_CONSUMER(cp); 110 111 /* 112 * If the the provider has orphaned us, just return EXIO. 113 */ 114 if (cp->provider == NULL) { 115 bp->b_error = ENXIO; 116 bp->b_ioflags |= BIO_ERROR; 117 vfslocked = VFS_LOCK_GIANT(((struct mount *)NULL)); 118 bufdone(bp); 119 VFS_UNLOCK_GIANT(vfslocked); 120 return; 121 } 122 123 bip = g_alloc_bio(); 124 bip->bio_cmd = bp->b_iocmd; 125 bip->bio_offset = bp->b_iooffset; 126 bip->bio_data = bp->b_data; 127 bip->bio_done = g_vfs_done; 128 bip->bio_caller2 = bp; 129 bip->bio_length = bp->b_bcount; 130 g_io_request(bip, cp); 131 } 132 133 static void 134 g_vfs_orphan(struct g_consumer *cp) 135 { 136 struct g_geom *gp; 137 struct bufobj *bo; 138 139 g_topology_assert(); 140 141 gp = cp->geom; 142 bo = gp->softc; 143 g_trace(G_T_TOPOLOGY, "g_vfs_orphan(%p(%s))", cp, gp->name); 144 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 145 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 146 g_detach(cp); 147 148 /* 149 * Do not destroy the geom. Filesystem will do that during unmount. 150 */ 151 } 152 153 int 154 g_vfs_open(struct vnode *vp, struct g_consumer **cpp, const char *fsname, int wr) 155 { 156 struct g_geom *gp; 157 struct g_provider *pp; 158 struct g_consumer *cp; 159 struct bufobj *bo; 160 int vfslocked; 161 int error; 162 163 g_topology_assert(); 164 165 *cpp = NULL; 166 pp = g_dev_getprovider(vp->v_rdev); 167 if (pp == NULL) 168 return (ENOENT); 169 gp = g_new_geomf(&g_vfs_class, "%s.%s", fsname, pp->name); 170 cp = g_new_consumer(gp); 171 g_attach(cp, pp); 172 error = g_access(cp, 1, wr, 1); 173 if (error) { 174 g_wither_geom(gp, ENXIO); 175 return (error); 176 } 177 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 178 vnode_create_vobject(vp, pp->mediasize, curthread); 179 VFS_UNLOCK_GIANT(vfslocked); 180 *cpp = cp; 181 bo = &vp->v_bufobj; 182 bo->bo_ops = g_vfs_bufops; 183 bo->bo_private = cp; 184 bo->bo_bsize = pp->sectorsize; 185 gp->softc = bo; 186 187 return (error); 188 } 189 190 void 191 g_vfs_close(struct g_consumer *cp) 192 { 193 struct g_geom *gp; 194 struct bufobj *bo; 195 196 g_topology_assert(); 197 198 gp = cp->geom; 199 bo = gp->softc; 200 bufobj_invalbuf(bo, V_SAVE, 0, 0); 201 g_wither_geom_close(gp, ENXIO); 202 } 203