vdev_file.c revision 8ad4d6dd86f5bc65fb3afa566c8133f3bac21648
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER START
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The contents of this file are subject to the terms of the
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * Common Development and Distribution License (the "License").
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * You may not use this file except in compliance with the License.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
fa9e4066f08beec538e775443c5be79dd423fcabahrens * or http://www.opensolaris.org/os/licensing.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * See the License for the specific language governing permissions
fa9e4066f08beec538e775443c5be79dd423fcabahrens * and limitations under the License.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * When distributing Covered Code, include this CDDL HEADER in each
fa9e4066f08beec538e775443c5be79dd423fcabahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If applicable, add the following below this CDDL HEADER, with the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * fields enclosed by brackets "[]" replaced with your own identifying
fa9e4066f08beec538e775443c5be79dd423fcabahrens * information: Portions Copyright [yyyy] [name of copyright owner]
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER END
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
32b87932f3ef0887d873b7f6d2d1943799b2afc0ek * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Use is subject to license terms.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/zfs_context.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/spa.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/vdev_file.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/vdev_impl.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/zio.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/fs/zfs.h>
51ece83525fa18f5e72627610f480dffc7e492fdeschrock#include <sys/fm/fs/zfs.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Virtual device vector for files.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic int
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwickvdev_file_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_file_t *vf;
fa9e4066f08beec538e775443c5be79dd423fcabahrens vnode_t *vp;
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick vattr_t vattr;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int error;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * We must have a pathname, and it must be absolute.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
fa9e4066f08beec538e775443c5be79dd423fcabahrens vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (EINVAL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens vf = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_file_t), KM_SLEEP);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * We always open the files from the root of the global zone, even if
fa9e4066f08beec538e775443c5be79dd423fcabahrens * we're in a local zone. If the user has gotten to this point, the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * administrator has already decided that the pool should be available
fa9e4066f08beec538e775443c5be79dd423fcabahrens * to local zone users, so the underlying devices should be as well.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(vd->vdev_path != NULL && vd->vdev_path[0] == '/');
0a4e9518a44f226be6d39383330b5b1792d2f184gw error = vn_openat(vd->vdev_path + 1, UIO_SYSSPACE,
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick spa_mode(vd->vdev_spa) | FOFFMAX, 0, &vp, 0, 0, rootdir, -1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (error) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (error);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens vf->vf_vnode = vp;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens#ifdef _KERNEL
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Make sure it's a regular file.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (vp->v_type != VREG) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (ENODEV);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens#endif
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Determine the physical size of the file.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens vattr.va_mask = AT_SIZE;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw error = VOP_GETATTR(vf->vf_vnode, &vattr, 0, kcred, NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (error) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (error);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens *psize = vattr.va_size;
fa9e4066f08beec538e775443c5be79dd423fcabahrens *ashift = SPA_MINBLOCKSHIFT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic void
fa9e4066f08beec538e775443c5be79dd423fcabahrensvdev_file_close(vdev_t *vd)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_file_t *vf = vd->vdev_tsd;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (vf == NULL)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (vf->vf_vnode != NULL) {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw (void) VOP_PUTPAGE(vf->vf_vnode, 0, 0, B_INVAL, kcred, NULL);
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick (void) VOP_CLOSE(vf->vf_vnode, spa_mode(vd->vdev_spa), 1, 0,
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick kcred, NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens VN_RELE(vf->vf_vnode);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens kmem_free(vf, sizeof (vdev_file_t));
fa9e4066f08beec538e775443c5be79dd423fcabahrens vd->vdev_tsd = NULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
e05725b117836db173257fae43fb0746eb857fb5bonwickstatic int
fa9e4066f08beec538e775443c5be79dd423fcabahrensvdev_file_io_start(zio_t *zio)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_t *vd = zio->io_vd;
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_file_t *vf = vd->vdev_tsd;
fa9e4066f08beec538e775443c5be79dd423fcabahrens ssize_t resid;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zio->io_type == ZIO_TYPE_IOCTL) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* XXPOLICY */
0a4e9518a44f226be6d39383330b5b1792d2f184gw if (!vdev_readable(vd)) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens zio->io_error = ENXIO;
e05725b117836db173257fae43fb0746eb857fb5bonwick return (ZIO_PIPELINE_CONTINUE);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens switch (zio->io_cmd) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens case DKIOCFLUSHWRITECACHE:
fa9e4066f08beec538e775443c5be79dd423fcabahrens zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw kcred, NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens break;
fa9e4066f08beec538e775443c5be79dd423fcabahrens default:
fa9e4066f08beec538e775443c5be79dd423fcabahrens zio->io_error = ENOTSUP;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
e05725b117836db173257fae43fb0746eb857fb5bonwick return (ZIO_PIPELINE_CONTINUE);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens zio->io_error = vn_rdwr(zio->io_type == ZIO_TYPE_READ ?
fa9e4066f08beec538e775443c5be79dd423fcabahrens UIO_READ : UIO_WRITE, vf->vf_vnode, zio->io_data,
fa9e4066f08beec538e775443c5be79dd423fcabahrens zio->io_size, zio->io_offset, UIO_SYSSPACE,
fa9e4066f08beec538e775443c5be79dd423fcabahrens 0, RLIM64_INFINITY, kcred, &resid);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (resid != 0 && zio->io_error == 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens zio->io_error = ENOSPC;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
e05725b117836db173257fae43fb0746eb857fb5bonwick zio_interrupt(zio);
e05725b117836db173257fae43fb0746eb857fb5bonwick
e05725b117836db173257fae43fb0746eb857fb5bonwick return (ZIO_PIPELINE_STOP);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick/* ARGSUSED */
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwickstatic void
fa9e4066f08beec538e775443c5be79dd423fcabahrensvdev_file_io_done(zio_t *zio)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvdev_ops_t vdev_file_ops = {
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_file_open,
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_file_close,
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_default_asize,
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_file_io_start,
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_file_io_done,
fa9e4066f08beec538e775443c5be79dd423fcabahrens NULL,
fa9e4066f08beec538e775443c5be79dd423fcabahrens VDEV_TYPE_FILE, /* name of this vdev type */
fa9e4066f08beec538e775443c5be79dd423fcabahrens B_TRUE /* leaf vdev */
fa9e4066f08beec538e775443c5be79dd423fcabahrens};
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * From userland we access disks just like files.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens#ifndef _KERNEL
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvdev_ops_t vdev_disk_ops = {
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_file_open,
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_file_close,
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_default_asize,
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_file_io_start,
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_file_io_done,
fa9e4066f08beec538e775443c5be79dd423fcabahrens NULL,
fa9e4066f08beec538e775443c5be79dd423fcabahrens VDEV_TYPE_DISK, /* name of this vdev type */
fa9e4066f08beec538e775443c5be79dd423fcabahrens B_TRUE /* leaf vdev */
fa9e4066f08beec538e775443c5be79dd423fcabahrens};
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens#endif