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 }; 54 55 struct buf_ops *g_vfs_bufops = &__g_vfs_bufops; 56 57 static g_orphan_t g_vfs_orphan; 58 59 static struct g_class g_vfs_class = { 60 .name = "VFS", 61 .version = G_VERSION, 62 .orphan = g_vfs_orphan, 63 }; 64 65 DECLARE_GEOM_CLASS(g_vfs_class, g_vfs); 66 67 static void 68 g_vfs_done(struct bio *bip) 69 { 70 struct buf *bp; 71 int vfslocked; 72 73 if (bip->bio_error) { 74 printf("g_vfs_done():"); 75 g_print_bio(bip); 76 printf("error = %d\n", bip->bio_error); 77 } 78 bp = bip->bio_caller2; 79 bp->b_error = bip->bio_error; 80 bp->b_ioflags = bip->bio_flags; 81 if (bip->bio_error) 82 bp->b_ioflags |= BIO_ERROR; 83 bp->b_resid = bp->b_bcount - bip->bio_completed; 84 g_destroy_bio(bip); 85 vfslocked = VFS_LOCK_GIANT(((struct mount *)NULL)); 86 bufdone(bp); 87 VFS_UNLOCK_GIANT(vfslocked); 88 } 89 90 void 91 g_vfs_strategy(struct bufobj *bo, struct buf *bp) 92 { 93 struct g_consumer *cp; 94 struct bio *bip; 95 96 cp = bo->bo_private; 97 G_VALID_CONSUMER(cp); 98 99 bip = g_alloc_bio(); 100 bip->bio_cmd = bp->b_iocmd; 101 bip->bio_offset = bp->b_iooffset; 102 bip->bio_data = bp->b_data; 103 bip->bio_done = g_vfs_done; 104 bip->bio_caller2 = bp; 105 bip->bio_length = bp->b_bcount; 106 g_io_request(bip, cp); 107 } 108 109 static void 110 g_vfs_orphan(struct g_consumer *cp) 111 { 112 113 /* 114 * Don't do anything here yet. 115 * 116 * Ideally we should detach the consumer already now, but that 117 * leads to a locking requirement in the I/O path to see if we have 118 * a consumer or not. Considering how ugly things are going to get 119 * anyway as none of our filesystems are graceful about i/o errors, 120 * this is not important right now. 121 * 122 * Down the road, this is the place where we could give the user 123 * a "Abort, Retry or Ignore" option to replace the media again. 124 */ 125 } 126 127 int 128 g_vfs_open(struct vnode *vp, struct g_consumer **cpp, const char *fsname, int wr) 129 { 130 struct g_geom *gp; 131 struct g_provider *pp; 132 struct g_consumer *cp; 133 struct bufobj *bo; 134 int vfslocked; 135 int error; 136 137 g_topology_assert(); 138 139 *cpp = NULL; 140 pp = g_dev_getprovider(vp->v_rdev); 141 if (pp == NULL) 142 return (ENOENT); 143 gp = g_new_geomf(&g_vfs_class, "%s.%s", fsname, pp->name); 144 cp = g_new_consumer(gp); 145 g_attach(cp, pp); 146 error = g_access(cp, 1, wr, 1); 147 if (error) { 148 g_wither_geom(gp, ENXIO); 149 return (error); 150 } 151 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 152 vnode_create_vobject(vp, pp->mediasize, curthread); 153 VFS_UNLOCK_GIANT(vfslocked); 154 *cpp = cp; 155 bo = &vp->v_bufobj; 156 bo->bo_ops = g_vfs_bufops; 157 bo->bo_private = cp; 158 bo->bo_bsize = pp->sectorsize; 159 gp->softc = bo; 160 161 return (error); 162 } 163 164 void 165 g_vfs_close(struct g_consumer *cp, struct thread *td) 166 { 167 struct g_geom *gp; 168 struct bufobj *bo; 169 170 g_topology_assert(); 171 172 gp = cp->geom; 173 bo = gp->softc; 174 bufobj_invalbuf(bo, V_SAVE, td, 0, 0); 175 g_wither_geom_close(gp, ENXIO); 176 } 177