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 97 cp = bo->bo_private; 98 G_VALID_CONSUMER(cp); 99 100 bip = g_alloc_bio(); 101 bip->bio_cmd = bp->b_iocmd; 102 bip->bio_offset = bp->b_iooffset; 103 bip->bio_data = bp->b_data; 104 bip->bio_done = g_vfs_done; 105 bip->bio_caller2 = bp; 106 bip->bio_length = bp->b_bcount; 107 g_io_request(bip, cp); 108 } 109 110 static void 111 g_vfs_orphan(struct g_consumer *cp) 112 { 113 114 /* 115 * Don't do anything here yet. 116 * 117 * Ideally we should detach the consumer already now, but that 118 * leads to a locking requirement in the I/O path to see if we have 119 * a consumer or not. Considering how ugly things are going to get 120 * anyway as none of our filesystems are graceful about i/o errors, 121 * this is not important right now. 122 * 123 * Down the road, this is the place where we could give the user 124 * a "Abort, Retry or Ignore" option to replace the media again. 125 */ 126 } 127 128 int 129 g_vfs_open(struct vnode *vp, struct g_consumer **cpp, const char *fsname, int wr) 130 { 131 struct g_geom *gp; 132 struct g_provider *pp; 133 struct g_consumer *cp; 134 struct bufobj *bo; 135 int vfslocked; 136 int error; 137 138 g_topology_assert(); 139 140 *cpp = NULL; 141 pp = g_dev_getprovider(vp->v_rdev); 142 if (pp == NULL) 143 return (ENOENT); 144 gp = g_new_geomf(&g_vfs_class, "%s.%s", fsname, pp->name); 145 cp = g_new_consumer(gp); 146 g_attach(cp, pp); 147 error = g_access(cp, 1, wr, 1); 148 if (error) { 149 g_wither_geom(gp, ENXIO); 150 return (error); 151 } 152 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 153 vnode_create_vobject(vp, pp->mediasize, curthread); 154 VFS_UNLOCK_GIANT(vfslocked); 155 *cpp = cp; 156 bo = &vp->v_bufobj; 157 bo->bo_ops = g_vfs_bufops; 158 bo->bo_private = cp; 159 bo->bo_bsize = pp->sectorsize; 160 gp->softc = bo; 161 162 return (error); 163 } 164 165 void 166 g_vfs_close(struct g_consumer *cp, struct thread *td) 167 { 168 struct g_geom *gp; 169 struct bufobj *bo; 170 171 g_topology_assert(); 172 173 gp = cp->geom; 174 bo = gp->softc; 175 bufobj_invalbuf(bo, V_SAVE, td, 0, 0); 176 g_wither_geom_close(gp, ENXIO); 177 } 178