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 if (bip->bio_error) { 75 printf("g_vfs_done():"); 76 g_print_bio(bip); 77 printf("error = %d\n", bip->bio_error); 78 } 79 bp = bip->bio_caller2; 80 bp->b_error = bip->bio_error; 81 bp->b_ioflags = bip->bio_flags; 82 if (bip->bio_error) 83 bp->b_ioflags |= BIO_ERROR; 84 bp->b_resid = bp->b_bcount - bip->bio_completed; 85 g_destroy_bio(bip); 86 vfslocked = VFS_LOCK_GIANT(((struct mount *)NULL)); 87 bufdone(bp); 88 VFS_UNLOCK_GIANT(vfslocked); 89 } 90 91 void 92 g_vfs_strategy(struct bufobj *bo, struct buf *bp) 93 { 94 struct g_consumer *cp; 95 struct bio *bip; 96 int vfslocked; 97 98 cp = bo->bo_private; 99 G_VALID_CONSUMER(cp); 100 101 /* 102 * If the the provider has orphaned us, just return EXIO. 103 */ 104 if (cp->provider == NULL) { 105 bp->b_error = ENXIO; 106 bp->b_ioflags |= BIO_ERROR; 107 vfslocked = VFS_LOCK_GIANT(((struct mount *)NULL)); 108 bufdone(bp); 109 VFS_UNLOCK_GIANT(vfslocked); 110 return; 111 } 112 113 bip = g_alloc_bio(); 114 bip->bio_cmd = bp->b_iocmd; 115 bip->bio_offset = bp->b_iooffset; 116 bip->bio_data = bp->b_data; 117 bip->bio_done = g_vfs_done; 118 bip->bio_caller2 = bp; 119 bip->bio_length = bp->b_bcount; 120 g_io_request(bip, cp); 121 } 122 123 static void 124 g_vfs_orphan(struct g_consumer *cp) 125 { 126 struct g_geom *gp; 127 struct bufobj *bo; 128 129 g_topology_assert(); 130 131 gp = cp->geom; 132 bo = gp->softc; 133 g_trace(G_T_TOPOLOGY, "g_vfs_orphan(%p(%s))", cp, gp->name); 134 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 135 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 136 g_detach(cp); 137 138 /* 139 * Do not destroy the geom. Filesystem will do this during unmount. 140 */ 141 } 142 143 int 144 g_vfs_open(struct vnode *vp, struct g_consumer **cpp, const char *fsname, int wr) 145 { 146 struct g_geom *gp; 147 struct g_provider *pp; 148 struct g_consumer *cp; 149 struct bufobj *bo; 150 int vfslocked; 151 int error; 152 153 g_topology_assert(); 154 155 *cpp = NULL; 156 pp = g_dev_getprovider(vp->v_rdev); 157 if (pp == NULL) 158 return (ENOENT); 159 gp = g_new_geomf(&g_vfs_class, "%s.%s", fsname, pp->name); 160 cp = g_new_consumer(gp); 161 g_attach(cp, pp); 162 error = g_access(cp, 1, wr, 1); 163 if (error) { 164 g_wither_geom(gp, ENXIO); 165 return (error); 166 } 167 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 168 vnode_create_vobject(vp, pp->mediasize, curthread); 169 VFS_UNLOCK_GIANT(vfslocked); 170 *cpp = cp; 171 bo = &vp->v_bufobj; 172 bo->bo_ops = g_vfs_bufops; 173 bo->bo_private = cp; 174 bo->bo_bsize = pp->sectorsize; 175 gp->softc = bo; 176 177 return (error); 178 } 179 180 void 181 g_vfs_close(struct g_consumer *cp) 182 { 183 struct g_geom *gp; 184 struct bufobj *bo; 185 186 g_topology_assert(); 187 188 gp = cp->geom; 189 bo = gp->softc; 190 bufobj_invalbuf(bo, V_SAVE, 0, 0); 191 g_wither_geom_close(gp, ENXIO); 192 } 193