Move the world out of /zfs/ and seperate out module build tree

[zfs.git] / module / zfs / vdev_file.c

diff --git a/module/zfs/vdev_file.c b/module/zfs/vdev_file.c
new file mode 100644 (file)
index 0000000..dc0e920
--- /dev/null
+++ b/module/zfs/vdev_file.c
@@ -0,0 +1,188 @@
+/*
+ * 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 2008 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#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 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);
+       }
+
+       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 | 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
+       /*
+        * 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 (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, 1, 0, kcred, NULL);
+               VN_RELE(vf->vf_vnode);
+       }
+
+       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_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_TYPE_DISK,         /* name of this vdev type */
+       B_TRUE                  /* leaf vdev */
+};
+
+#endif