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 37 #include <geom/geom.h> 38 #include <geom/geom_vfs.h> 39 40 /* 41 * subroutines for use by filesystems. 42 * 43 * XXX: should maybe live somewhere else ? 44 */ 45 #include <sys/buf.h> 46 47 static struct buf_ops __g_vfs_bufops = { 48 .bop_name = "GEOM_VFS", 49 .bop_write = bufwrite, 50 .bop_strategy = g_vfs_strategy, 51 .bop_sync = bufsync, 52 }; 53 54 struct buf_ops *g_vfs_bufops = &__g_vfs_bufops; 55 56 static struct g_class g_vfs_class = { 57 .name = "VFS", 58 .version = G_VERSION, 59 .orphan = g_vfs_orphan, 60 }; 61 62 DECLARE_GEOM_CLASS(g_vfs_class, g_vfs); 63 64 static void 65 g_vfs_done(struct bio *bip) 66 { 67 struct buf *bp; 68 69 if (bip->bio_error) { 70 printf("g_vfs_done():"); 71 g_print_bio(bip); 72 printf("error = %d\n", bip->bio_error); 73 } 74 bp = bip->bio_caller2; 75 bp->b_error = bip->bio_error; 76 bp->b_ioflags = bip->bio_flags; 77 if (bip->bio_error) 78 bp->b_ioflags |= BIO_ERROR; 79 bp->b_resid = bp->b_bcount - bip->bio_completed; 80 g_destroy_bio(bip); 81 mtx_lock(&Giant); 82 bufdone(bp); 83 mtx_unlock(&Giant); 84 } 85 86 void 87 g_vfs_strategy(struct bufobj *bo, struct buf *bp) 88 { 89 struct g_consumer *cp; 90 struct bio *bip; 91 92 cp = bo->bo_private; 93 G_VALID_CONSUMER(cp); 94 95 bip = g_alloc_bio(); 96 bip->bio_cmd = bp->b_iocmd; 97 bip->bio_offset = bp->b_iooffset; 98 bip->bio_data = bp->b_data; 99 bip->bio_done = g_vfs_done; 100 bip->bio_caller2 = bp; 101 bip->bio_length = bp->b_bcount; 102 g_io_request(bip, cp); 103 } 104 105 void 106 g_vfs_orphan(struct g_consumer *cp) 107 { 108 109 /* 110 * Don't do anything here yet. 111 * 112 * Ideally we should detach the consumer already now, but that 113 * leads to a locking requirement in the I/O path to see if we have 114 * a consumer or not. Considering how ugly things are going to get 115 * anyway as none of our filesystems are graceful about i/o errors, 116 * this is not important right now. 117 * 118 * Down the road, this is the place where we could give the user 119 * a "Abort, Retry or Ignore" option to replace the media again. 120 */ 121 } 122 123 int 124 g_vfs_open(struct vnode *vp, struct g_consumer **cpp, const char *fsname, int wr) 125 { 126 struct g_geom *gp; 127 struct g_provider *pp; 128 struct g_consumer *cp; 129 struct bufobj *bo; 130 int error; 131 132 g_topology_assert(); 133 134 *cpp = NULL; 135 pp = g_dev_getprovider(vp->v_rdev); 136 if (pp == NULL) 137 return (ENOENT); 138 gp = g_new_geomf(&g_vfs_class, "%s.%s", fsname, pp->name); 139 cp = g_new_consumer(gp); 140 g_attach(cp, pp); 141 error = g_access(cp, 1, wr, 1); 142 if (error) { 143 g_wither_geom(gp, ENXIO); 144 return (error); 145 } 146 *cpp = cp; 147 bo = &vp->v_bufobj; 148 bo->bo_ops = g_vfs_bufops; 149 bo->bo_private = cp; 150 bo->bo_bsize = pp->sectorsize; 151 152 return (error); 153 } 154