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Diffstat (limited to 'uts/common/fs/zfs/vdev_file.c')
-rw-r--r--uts/common/fs/zfs/vdev_file.c217
1 files changed, 217 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/vdev_file.c b/uts/common/fs/zfs/vdev_file.c
new file mode 100644
index 000000000000..8c22aa5316a1
--- /dev/null
+++ b/uts/common/fs/zfs/vdev_file.c
@@ -0,0 +1,217 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ */
+
+#include <sys/zfs_context.h>
+#include <sys/spa.h>
+#include <sys/vdev_file.h>
+#include <sys/vdev_impl.h>
+#include <sys/zio.h>
+#include <sys/fs/zfs.h>
+#include <sys/fm/fs/zfs.h>
+
+/*
+ * Virtual device vector for files.
+ */
+
+static void
+vdev_file_hold(vdev_t *vd)
+{
+ ASSERT(vd->vdev_path != NULL);
+}
+
+static void
+vdev_file_rele(vdev_t *vd)
+{
+ ASSERT(vd->vdev_path != NULL);
+}
+
+static int
+vdev_file_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift)
+{
+ vdev_file_t *vf;
+ vnode_t *vp;
+ vattr_t vattr;
+ int error;
+
+ /*
+ * We must have a pathname, and it must be absolute.
+ */
+ if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
+ vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
+ return (EINVAL);
+ }
+
+ /*
+ * Reopen the device if it's not currently open. Otherwise,
+ * just update the physical size of the device.
+ */
+ if (vd->vdev_tsd != NULL) {
+ ASSERT(vd->vdev_reopening);
+ vf = vd->vdev_tsd;
+ goto skip_open;
+ }
+
+ vf = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_file_t), KM_SLEEP);
+
+ /*
+ * We always open the files from the root of the global zone, even if
+ * we're in a local zone. If the user has gotten to this point, the
+ * administrator has already decided that the pool should be available
+ * to local zone users, so the underlying devices should be as well.
+ */
+ ASSERT(vd->vdev_path != NULL && vd->vdev_path[0] == '/');
+ error = vn_openat(vd->vdev_path + 1, UIO_SYSSPACE,
+ spa_mode(vd->vdev_spa) | FOFFMAX, 0, &vp, 0, 0, rootdir, -1);
+
+ if (error) {
+ vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
+ return (error);
+ }
+
+ vf->vf_vnode = vp;
+
+#ifdef _KERNEL
+ /*
+ * Make sure it's a regular file.
+ */
+ if (vp->v_type != VREG) {
+ vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
+ return (ENODEV);
+ }
+#endif
+
+skip_open:
+ /*
+ * Determine the physical size of the file.
+ */
+ vattr.va_mask = AT_SIZE;
+ error = VOP_GETATTR(vf->vf_vnode, &vattr, 0, kcred, NULL);
+ if (error) {
+ vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
+ return (error);
+ }
+
+ *psize = vattr.va_size;
+ *ashift = SPA_MINBLOCKSHIFT;
+
+ return (0);
+}
+
+static void
+vdev_file_close(vdev_t *vd)
+{
+ vdev_file_t *vf = vd->vdev_tsd;
+
+ if (vd->vdev_reopening || vf == NULL)
+ return;
+
+ if (vf->vf_vnode != NULL) {
+ (void) VOP_PUTPAGE(vf->vf_vnode, 0, 0, B_INVAL, kcred, NULL);
+ (void) VOP_CLOSE(vf->vf_vnode, spa_mode(vd->vdev_spa), 1, 0,
+ kcred, NULL);
+ VN_RELE(vf->vf_vnode);
+ }
+
+ vd->vdev_delayed_close = B_FALSE;
+ kmem_free(vf, sizeof (vdev_file_t));
+ vd->vdev_tsd = NULL;
+}
+
+static int
+vdev_file_io_start(zio_t *zio)
+{
+ vdev_t *vd = zio->io_vd;
+ vdev_file_t *vf = vd->vdev_tsd;
+ ssize_t resid;
+
+ if (zio->io_type == ZIO_TYPE_IOCTL) {
+ /* XXPOLICY */
+ if (!vdev_readable(vd)) {
+ zio->io_error = ENXIO;
+ return (ZIO_PIPELINE_CONTINUE);
+ }
+
+ switch (zio->io_cmd) {
+ case DKIOCFLUSHWRITECACHE:
+ zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC,
+ kcred, NULL);
+ break;
+ default:
+ zio->io_error = ENOTSUP;
+ }
+
+ return (ZIO_PIPELINE_CONTINUE);
+ }
+
+ zio->io_error = vn_rdwr(zio->io_type == ZIO_TYPE_READ ?
+ UIO_READ : UIO_WRITE, vf->vf_vnode, zio->io_data,
+ zio->io_size, zio->io_offset, UIO_SYSSPACE,
+ 0, RLIM64_INFINITY, kcred, &resid);
+
+ if (resid != 0 && zio->io_error == 0)
+ zio->io_error = ENOSPC;
+
+ zio_interrupt(zio);
+
+ return (ZIO_PIPELINE_STOP);
+}
+
+/* ARGSUSED */
+static void
+vdev_file_io_done(zio_t *zio)
+{
+}
+
+vdev_ops_t vdev_file_ops = {
+ vdev_file_open,
+ vdev_file_close,
+ vdev_default_asize,
+ vdev_file_io_start,
+ vdev_file_io_done,
+ NULL,
+ vdev_file_hold,
+ vdev_file_rele,
+ VDEV_TYPE_FILE, /* name of this vdev type */
+ B_TRUE /* leaf vdev */
+};
+
+/*
+ * From userland we access disks just like files.
+ */
+#ifndef _KERNEL
+
+vdev_ops_t vdev_disk_ops = {
+ vdev_file_open,
+ vdev_file_close,
+ vdev_default_asize,
+ vdev_file_io_start,
+ vdev_file_io_done,
+ NULL,
+ vdev_file_hold,
+ vdev_file_rele,
+ VDEV_TYPE_DISK, /* name of this vdev type */
+ B_TRUE /* leaf vdev */
+};
+
+#endif