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 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #include <sys/zfs_context.h> 27 #include <sys/spa.h> 28 #include <sys/vdev_file.h> 29 #include <sys/vdev_impl.h> 30 #include <sys/zio.h> 31 #include <sys/fs/zfs.h> 32 #include <sys/fm/fs/zfs.h> 33 34 /* 35 * Virtual device vector for files. 36 */ 37 38 static int 39 vdev_file_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift) 40 { 41 vdev_file_t *vf; 42 vnode_t *vp; 43 vattr_t vattr; 44 int error; 45 46 /* 47 * We must have a pathname, and it must be absolute. 48 */ 49 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') { 50 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 51 return (EINVAL); 52 } 53 54 vf = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_file_t), KM_SLEEP); 55 56 /* 57 * We always open the files from the root of the global zone, even if 58 * we're in a local zone. If the user has gotten to this point, the 59 * administrator has already decided that the pool should be available 60 * to local zone users, so the underlying devices should be as well. 61 */ 62 ASSERT(vd->vdev_path != NULL && vd->vdev_path[0] == '/'); 63 error = vn_openat(vd->vdev_path + 1, UIO_SYSSPACE, 64 spa_mode | FOFFMAX, 0, &vp, 0, 0, rootdir, -1); 65 66 if (error) { 67 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 68 return (error); 69 } 70 71 vf->vf_vnode = vp; 72 73 #ifdef _KERNEL 74 /* 75 * Make sure it's a regular file. 76 */ 77 if (vp->v_type != VREG) { 78 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 79 return (ENODEV); 80 } 81 #endif 82 /* 83 * Determine the physical size of the file. 84 */ 85 vattr.va_mask = AT_SIZE; 86 error = VOP_GETATTR(vf->vf_vnode, &vattr, 0, kcred, NULL); 87 if (error) { 88 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 89 return (error); 90 } 91 92 *psize = vattr.va_size; 93 *ashift = SPA_MINBLOCKSHIFT; 94 95 return (0); 96 } 97 98 static void 99 vdev_file_close(vdev_t *vd) 100 { 101 vdev_file_t *vf = vd->vdev_tsd; 102 103 if (vf == NULL) 104 return; 105 106 if (vf->vf_vnode != NULL) { 107 (void) VOP_PUTPAGE(vf->vf_vnode, 0, 0, B_INVAL, kcred, NULL); 108 (void) VOP_CLOSE(vf->vf_vnode, spa_mode, 1, 0, kcred, NULL); 109 VN_RELE(vf->vf_vnode); 110 } 111 112 kmem_free(vf, sizeof (vdev_file_t)); 113 vd->vdev_tsd = NULL; 114 } 115 116 static int 117 vdev_file_io_start(zio_t *zio) 118 { 119 vdev_t *vd = zio->io_vd; 120 vdev_file_t *vf = vd->vdev_tsd; 121 ssize_t resid; 122 123 if (zio->io_type == ZIO_TYPE_IOCTL) { 124 /* XXPOLICY */ 125 if (!vdev_readable(vd)) { 126 zio->io_error = ENXIO; 127 return (ZIO_PIPELINE_CONTINUE); 128 } 129 130 switch (zio->io_cmd) { 131 case DKIOCFLUSHWRITECACHE: 132 zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC, 133 kcred, NULL); 134 break; 135 default: 136 zio->io_error = ENOTSUP; 137 } 138 139 return (ZIO_PIPELINE_CONTINUE); 140 } 141 142 zio->io_error = vn_rdwr(zio->io_type == ZIO_TYPE_READ ? 143 UIO_READ : UIO_WRITE, vf->vf_vnode, zio->io_data, 144 zio->io_size, zio->io_offset, UIO_SYSSPACE, 145 0, RLIM64_INFINITY, kcred, &resid); 146 147 if (resid != 0 && zio->io_error == 0) 148 zio->io_error = ENOSPC; 149 150 zio_interrupt(zio); 151 152 return (ZIO_PIPELINE_STOP); 153 } 154 155 /* ARGSUSED */ 156 static void 157 vdev_file_io_done(zio_t *zio) 158 { 159 } 160 161 vdev_ops_t vdev_file_ops = { 162 vdev_file_open, 163 vdev_file_close, 164 vdev_default_asize, 165 vdev_file_io_start, 166 vdev_file_io_done, 167 NULL, 168 VDEV_TYPE_FILE, /* name of this vdev type */ 169 B_TRUE /* leaf vdev */ 170 }; 171 172 /* 173 * From userland we access disks just like files. 174 */ 175 #ifndef _KERNEL 176 177 vdev_ops_t vdev_disk_ops = { 178 vdev_file_open, 179 vdev_file_close, 180 vdev_default_asize, 181 vdev_file_io_start, 182 vdev_file_io_done, 183 NULL, 184 VDEV_TYPE_DISK, /* name of this vdev type */ 185 B_TRUE /* leaf vdev */ 186 }; 187 188 #endif 189