1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/zfs_context.h> 29 #include <sys/spa.h> 30 #include <sys/vdev_file.h> 31 #include <sys/vdev_impl.h> 32 #include <sys/zio.h> 33 #include <sys/fs/zfs.h> 34 35 /* 36 * Virtual device vector for files. 37 */ 38 39 static int 40 vdev_file_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift) 41 { 42 vdev_file_t *vf; 43 vnode_t *vp; 44 vattr_t vattr; 45 int error; 46 47 /* 48 * We must have a pathname, and it must be absolute. 49 */ 50 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') { 51 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 52 return (EINVAL); 53 } 54 55 vf = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_file_t), KM_SLEEP); 56 57 /* 58 * We always open the files from the root of the global zone, even if 59 * we're in a local zone. If the user has gotten to this point, the 60 * administrator has already decided that the pool should be available 61 * to local zone users, so the underlying devices should be as well. 62 */ 63 ASSERT(vd->vdev_path != NULL && vd->vdev_path[0] == '/'); 64 error = vn_openat(vd->vdev_path + 1, UIO_SYSSPACE, spa_mode | FOFFMAX, 65 0, &vp, 0, 0, rootdir); 66 67 if (error) { 68 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 69 return (error); 70 } 71 72 vf->vf_vnode = vp; 73 74 #ifdef _KERNEL 75 /* 76 * Make sure it's a regular file. 77 */ 78 if (vp->v_type != VREG) { 79 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 80 return (ENODEV); 81 } 82 #endif 83 84 /* 85 * Determine the physical size of the file. 86 */ 87 vattr.va_mask = AT_SIZE; 88 error = VOP_GETATTR(vp, &vattr, 0, kcred); 89 if (error) { 90 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 91 return (error); 92 } 93 94 *psize = vattr.va_size; 95 *ashift = SPA_MINBLOCKSHIFT; 96 97 return (0); 98 } 99 100 static void 101 vdev_file_close(vdev_t *vd) 102 { 103 vdev_file_t *vf = vd->vdev_tsd; 104 105 if (vf == NULL) 106 return; 107 108 if (vf->vf_vnode != NULL) { 109 (void) VOP_PUTPAGE(vf->vf_vnode, 0, 0, B_INVAL, kcred); 110 (void) VOP_CLOSE(vf->vf_vnode, spa_mode, 1, 0, kcred); 111 VN_RELE(vf->vf_vnode); 112 } 113 114 kmem_free(vf, sizeof (vdev_file_t)); 115 vd->vdev_tsd = NULL; 116 } 117 118 static void 119 vdev_file_io_start(zio_t *zio) 120 { 121 vdev_t *vd = zio->io_vd; 122 vdev_file_t *vf = vd->vdev_tsd; 123 ssize_t resid; 124 int error; 125 126 if (zio->io_type == ZIO_TYPE_IOCTL) { 127 zio_vdev_io_bypass(zio); 128 129 /* XXPOLICY */ 130 if (vdev_is_dead(vd)) { 131 zio->io_error = ENXIO; 132 zio_next_stage_async(zio); 133 return; 134 } 135 136 switch (zio->io_cmd) { 137 case DKIOCFLUSHWRITECACHE: 138 zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC, 139 kcred); 140 dprintf("fsync(%s) = %d\n", vdev_description(vd), 141 zio->io_error); 142 break; 143 default: 144 zio->io_error = ENOTSUP; 145 } 146 147 zio_next_stage_async(zio); 148 return; 149 } 150 151 /* 152 * In the kernel, don't bother double-caching, but in userland, 153 * we want to test the vdev_cache code. 154 */ 155 #ifndef _KERNEL 156 if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0) 157 return; 158 #endif 159 160 if ((zio = vdev_queue_io(zio)) == NULL) 161 return; 162 163 /* XXPOLICY */ 164 error = vdev_is_dead(vd) ? ENXIO : vdev_error_inject(vd, zio); 165 if (error) { 166 zio->io_error = error; 167 zio_next_stage_async(zio); 168 return; 169 } 170 171 zio->io_error = vn_rdwr(zio->io_type == ZIO_TYPE_READ ? 172 UIO_READ : UIO_WRITE, vf->vf_vnode, zio->io_data, 173 zio->io_size, zio->io_offset, UIO_SYSSPACE, 174 0, RLIM64_INFINITY, kcred, &resid); 175 176 if (resid != 0 && zio->io_error == 0) 177 zio->io_error = ENOSPC; 178 179 zio_next_stage_async(zio); 180 } 181 182 static void 183 vdev_file_io_done(zio_t *zio) 184 { 185 vdev_queue_io_done(zio); 186 187 #ifndef _KERNEL 188 if (zio->io_type == ZIO_TYPE_WRITE) 189 vdev_cache_write(zio); 190 #endif 191 192 if (zio_injection_enabled && zio->io_error == 0) 193 zio->io_error = zio_handle_device_injection(zio->io_vd, EIO); 194 195 zio_next_stage(zio); 196 } 197 198 vdev_ops_t vdev_file_ops = { 199 vdev_file_open, 200 vdev_file_close, 201 vdev_default_asize, 202 vdev_file_io_start, 203 vdev_file_io_done, 204 NULL, 205 VDEV_TYPE_FILE, /* name of this vdev type */ 206 B_TRUE /* leaf vdev */ 207 }; 208 209 /* 210 * From userland we access disks just like files. 211 */ 212 #ifndef _KERNEL 213 214 vdev_ops_t vdev_disk_ops = { 215 vdev_file_open, 216 vdev_file_close, 217 vdev_default_asize, 218 vdev_file_io_start, 219 vdev_file_io_done, 220 NULL, 221 VDEV_TYPE_DISK, /* name of this vdev type */ 222 B_TRUE /* leaf vdev */ 223 }; 224 225 #endif 226