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authorhaad <haad@NetBSD.org>2008-12-19 15:24:03 +0000
committerhaad <haad@NetBSD.org>2008-12-19 15:24:03 +0000
commitc9d0c62a0c2516f692248741b9902592dfd4f690 (patch)
treedf3160366e6de1d5dc788216cbed8f3cad3e04fe /sys/dev/dm/dm_target_linear.c
parent992269c5c4ca1327588284bd09118ceb10888690 (diff)
Merge the haad-dm branch to -current. This branch adds LVM functionality to
the base NetBSD system. It uses Linux LVM2 tools and our BSD licensed device-mapper driver. The device-mapper driver can be used to create virtual block devices which maps virtual blocks to real with target mapping called target. Currently these targets are available a linear, zero, error and a snapshot (this is work in progress and doesn't work yet). The lvm2tools adds lvm and dmsetup binary to based system, where the lvm tool is used to manage and administer whole LVM and the dmestup is used to communicate iwith device-mapper kernel driver. With these tools also a libdevmapper library is instaled to the base system. Building of tools and driver is currently disable and can be enabled with MKLVM=yes in mk.conf. I will add sets lists and rc.d script soon. Oked by agc@ and cube@.
Diffstat (limited to 'sys/dev/dm/dm_target_linear.c')
-rw-r--r--sys/dev/dm/dm_target_linear.c237
1 files changed, 237 insertions, 0 deletions
diff --git a/sys/dev/dm/dm_target_linear.c b/sys/dev/dm/dm_target_linear.c
new file mode 100644
index 00000000000..c65e21fc3a3
--- /dev/null
+++ b/sys/dev/dm/dm_target_linear.c
@@ -0,0 +1,237 @@
+/* $NetBSD: dm_target_linear.c,v 1.2 2008/12/19 15:24:03 haad Exp $ */
+
+/*
+ * Copyright (c) 2008 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Adam Hamsik.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+/*
+ * This file implements initial version of device-mapper dklinear target.
+ */
+
+#include <sys/types.h>
+#include <sys/param.h>
+
+#include <sys/buf.h>
+#include <sys/kmem.h>
+#include <sys/vnode.h>
+
+#include <machine/int_fmtio.h>
+
+#include "dm.h"
+
+/*
+ * Allocate target specific config data, and link them to table.
+ * This function is called only when, flags is not READONLY and
+ * therefore we can add things to pdev list. This should not a
+ * problem because this routine is called onyl from dm_table_load_ioctl.
+ * @argv[0] is name,
+ * @argv[1] is physical data offset.
+ */
+int
+dm_target_linear_init(dm_dev_t *dmv, void **target_config, char *params)
+{
+ dm_target_linear_config_t *tlc;
+ dm_pdev_t *dmp;
+
+ char **ap, *argv[3];
+
+ if(params == NULL)
+ return EINVAL;
+
+ /*
+ * Parse a string, containing tokens delimited by white space,
+ * into an argument vector
+ */
+ for (ap = argv; ap < &argv[9] &&
+ (*ap = strsep(&params, " \t")) != NULL;) {
+ if (**ap != '\0')
+ ap++;
+ }
+
+ /* Insert dmp to global pdev list */
+ if ((dmp = dm_pdev_insert(argv[0])) == NULL)
+ return ENOENT;
+
+ aprint_debug("Linear target init function called %s--%s!!\n",
+ argv[0], argv[1]);
+
+ if ((tlc = kmem_alloc(sizeof(dm_target_linear_config_t), KM_NOSLEEP))
+ == NULL)
+ return 1;
+
+ tlc->pdev = dmp;
+ tlc->offset = 0; /* default settings */
+
+ /* Check user input if it is not leave offset as 0. */
+ tlc->offset = atoi(argv[1]);
+
+ *target_config = tlc;
+
+ dmv->dev_type = DM_LINEAR_DEV;
+
+ return 0;
+}
+
+/*
+ * Status routine is called to get params string, which is target
+ * specific. When dm_table_status_ioctl is called with flag
+ * DM_STATUS_TABLE_FLAG I have to sent params string back.
+ */
+char *
+dm_target_linear_status(void *target_config)
+{
+ dm_target_linear_config_t *tlc;
+ char *params;
+ uint32_t i;
+ uint32_t count;
+ size_t prm_len;
+
+ tlc = target_config;
+ prm_len = 0;
+ count = 0;
+
+ /* count number of chars in offset */
+ for(i = tlc->offset; i != 0; i /= 10)
+ count++;
+
+ aprint_debug("Linear target status function called\n");
+
+ /* length of name + count of chars + one space and null char */
+ prm_len = strlen(tlc->pdev->name) + count + 2;
+
+ if ((params = kmem_alloc(prm_len, KM_NOSLEEP)) == NULL)
+ return NULL;
+
+ aprint_debug("%s %"PRIu64, tlc->pdev->name, tlc->offset);
+ snprintf(params, prm_len,"%s %"PRIu64, tlc->pdev->name, tlc->offset);
+
+ return params;
+}
+
+/*
+ * Do IO operation, called from dmstrategy routine.
+ */
+int
+dm_target_linear_strategy(dm_table_entry_t *table_en, struct buf *bp)
+{
+ dm_target_linear_config_t *tlc;
+
+ tlc = table_en->target_config;
+
+/* printf("Linear target read function called %" PRIu64 "!!\n",
+ tlc->offset);*/
+
+ bp->b_blkno += tlc->offset;
+
+ VOP_STRATEGY(tlc->pdev->pdev_vnode, bp);
+
+ return 0;
+
+}
+
+/*
+ * Destroy target specific data. Decrement table pdevs.
+ */
+int
+dm_target_linear_destroy(dm_table_entry_t *table_en)
+{
+ dm_target_linear_config_t *tlc;
+
+ /*
+ * Destroy function is called for every target even if it
+ * doesn't have target_config.
+ */
+
+ if (table_en->target_config == NULL)
+ return 0;
+
+ tlc = table_en->target_config;
+
+ /* Decrement pdev ref counter if 0 remove it */
+ dm_pdev_decr(tlc->pdev);
+
+ kmem_free(table_en->target_config, sizeof(dm_target_linear_config_t));
+
+ table_en->target_config = NULL;
+
+ return 0;
+}
+
+/* Add this target pdev dependiences to prop_array_t */
+int
+dm_target_linear_deps(dm_table_entry_t *table_en, prop_array_t prop_array)
+{
+ dm_target_linear_config_t *tlc;
+ struct vattr va;
+
+ int error;
+
+ if (table_en->target_config == NULL)
+ return ENOENT;
+
+ tlc = table_en->target_config;
+
+ if ((error = VOP_GETATTR(tlc->pdev->pdev_vnode, &va, curlwp->l_cred)) != 0)
+ return error;
+
+ prop_array_add_uint64(prop_array, (uint64_t)va.va_rdev);
+
+ return 0;
+}
+
+/*
+ * Register upcall device.
+ * Linear target doesn't need any upcall devices but other targets like
+ * mirror, snapshot, multipath, stripe will use this functionality.
+ */
+int
+dm_target_linear_upcall(dm_table_entry_t *table_en, struct buf *bp)
+{
+ return 0;
+}
+
+/*
+ * Transform char s to uint64_t offset number.
+ */
+uint64_t
+atoi(const char *s)
+{
+ uint64_t n;
+ n = 0;
+
+ while (*s != '\0') {
+ if (!isdigit(*s))
+ break;
+
+ n = (10 * n) + (*s - '0');
+ s++;
+ }
+
+ return n;
+}