/*      $NetBSD: striped.c,v 1.1.1.2 2009/12/02 00:26:47 haad Exp $     */

/*
* Copyright (C) 2003-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "lib.h"
#include "toolcontext.h"
#include "segtype.h"
#include "display.h"
#include "text_export.h"
#include "text_import.h"
#include "config.h"
#include "str_list.h"
#include "targets.h"
#include "lvm-string.h"
#include "activate.h"
#include "pv_alloc.h"
#include "metadata.h"

static const char *_striped_name(const struct lv_segment *seg)
{
       return (seg->area_count == 1) ? "linear" : seg->segtype->name;
}

static void _striped_display(const struct lv_segment *seg)
{
       uint32_t s;

       if (seg->area_count == 1)
               display_stripe(seg, 0, "  ");
       else {
               log_print("  Stripes\t\t%u", seg->area_count);

               if (seg->lv->vg->cmd->si_unit_consistency)
                       log_print("  Stripe size\t\t%s",
                                 display_size(seg->lv->vg->cmd,
                                              (uint64_t) seg->stripe_size));
               else
                       log_print("  Stripe size\t\t%u KB",
                                 seg->stripe_size / 2);

               for (s = 0; s < seg->area_count; s++) {
                       log_print("  Stripe %d:", s);
                       display_stripe(seg, s, "    ");
               }
       }
       log_print(" ");
}

static int _striped_text_import_area_count(struct config_node *sn, uint32_t *area_count)
{
       if (!get_config_uint32(sn, "stripe_count", area_count)) {
               log_error("Couldn't read 'stripe_count' for "
                         "segment '%s'.", config_parent_name(sn));
               return 0;
       }

       return 1;
}

static int _striped_text_import(struct lv_segment *seg, const struct config_node *sn,
                       struct dm_hash_table *pv_hash)
{
       struct config_node *cn;

       if ((seg->area_count != 1) &&
           !get_config_uint32(sn, "stripe_size", &seg->stripe_size)) {
               log_error("Couldn't read stripe_size for segment %s "
                         "of logical volume %s.", config_parent_name(sn), seg->lv->name);
               return 0;
       }

       if (!(cn = find_config_node(sn, "stripes"))) {
               log_error("Couldn't find stripes array for segment %s "
                         "of logical volume %s.", config_parent_name(sn), seg->lv->name);
               return 0;
       }

       seg->area_len /= seg->area_count;

       return text_import_areas(seg, sn, cn, pv_hash, 0);
}

static int _striped_text_export(const struct lv_segment *seg, struct formatter *f)
{

       outf(f, "stripe_count = %u%s", seg->area_count,
            (seg->area_count == 1) ? "\t# linear" : "");

       if (seg->area_count > 1)
               out_size(f, (uint64_t) seg->stripe_size,
                        "stripe_size = %u", seg->stripe_size);

       return out_areas(f, seg, "stripe");
}

/*
* Test whether two segments could be merged by the current merging code
*/
static int _striped_segments_compatible(struct lv_segment *first,
                               struct lv_segment *second)
{
       uint32_t width;
       unsigned s;

       if ((first->area_count != second->area_count) ||
           (first->stripe_size != second->stripe_size))
               return 0;

       for (s = 0; s < first->area_count; s++) {

               /* FIXME Relax this to first area type != second area type */
               /*       plus the additional AREA_LV checks needed */
               if ((seg_type(first, s) != AREA_PV) ||
                   (seg_type(second, s) != AREA_PV))
                       return 0;

               width = first->area_len;

               if ((seg_pv(first, s) !=
                    seg_pv(second, s)) ||
                   (seg_pe(first, s) + width !=
                    seg_pe(second, s)))
                       return 0;
       }

       if (!str_list_lists_equal(&first->tags, &second->tags))
               return 0;

       return 1;
}

static int _striped_merge_segments(struct lv_segment *seg1, struct lv_segment *seg2)
{
       uint32_t s;

       if (!_striped_segments_compatible(seg1, seg2))
               return 0;

       seg1->len += seg2->len;
       seg1->area_len += seg2->area_len;

       for (s = 0; s < seg1->area_count; s++)
               if (seg_type(seg1, s) == AREA_PV)
                       merge_pv_segments(seg_pvseg(seg1, s),
                                         seg_pvseg(seg2, s));

       return 1;
}

#ifdef DEVMAPPER_SUPPORT
static int _striped_add_target_line(struct dev_manager *dm,
                               struct dm_pool *mem __attribute((unused)),
                               struct cmd_context *cmd __attribute((unused)),
                               void **target_state __attribute((unused)),
                               struct lv_segment *seg,
                               struct dm_tree_node *node, uint64_t len,
                               uint32_t *pvmove_mirror_count __attribute((unused)))
{
       if (!seg->area_count) {
               log_error("Internal error: striped add_target_line called "
                         "with no areas for %s.", seg->lv->name);
               return 0;
       }
       if (seg->area_count == 1) {
               if (!dm_tree_node_add_linear_target(node, len))
                       return_0;
       } else if (!dm_tree_node_add_striped_target(node, len,
                                                 seg->stripe_size))
               return_0;

       return add_areas_line(dm, seg, node, 0u, seg->area_count);
}

static int _striped_target_present(struct cmd_context *cmd,
                                  const struct lv_segment *seg __attribute((unused)),
                                  unsigned *attributes __attribute((unused)))
{
       static int _striped_checked = 0;
       static int _striped_present = 0;

       if (!_striped_checked)
               _striped_present = target_present(cmd, "linear", 0) &&
                         target_present(cmd, "striped", 0);

       _striped_checked = 1;

       return _striped_present;
}
#endif

static void _striped_destroy(const struct segment_type *segtype)
{
       dm_free((void *)segtype);
}

static struct segtype_handler _striped_ops = {
       .name = _striped_name,
       .display = _striped_display,
       .text_import_area_count = _striped_text_import_area_count,
       .text_import = _striped_text_import,
       .text_export = _striped_text_export,
       .merge_segments = _striped_merge_segments,
#ifdef DEVMAPPER_SUPPORT
       .add_target_line = _striped_add_target_line,
       .target_present = _striped_target_present,
#endif
       .destroy = _striped_destroy,
};

struct segment_type *init_striped_segtype(struct cmd_context *cmd)
{
       struct segment_type *segtype = dm_malloc(sizeof(*segtype));

       if (!segtype)
               return_NULL;

       segtype->cmd = cmd;
       segtype->ops = &_striped_ops;
       segtype->name = "striped";
       segtype->private = NULL;
       segtype->flags =
           SEG_CAN_SPLIT | SEG_AREAS_STRIPED | SEG_FORMAT1_SUPPORT;

       log_very_verbose("Initialised segtype: %s", segtype->name);

       return segtype;
}

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