external/gpl2/lvm2/dist/lib/error/errseg.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
   5  *
   6  * This file is part of LVM2.
   7  *
   8  * This copyrighted material is made available to anyone wishing to use,
   9  * modify, copy, or redistribute it subject to the terms and conditions
  10  * of the GNU Lesser General Public License v.2.1.
  11  *
  12  * You should have received a copy of the GNU Lesser General Public License
  13  * along with this program; if not, write to the Free Software Foundation,
  14  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  */
  16
  17 #include "lib.h"
  18 #include "toolcontext.h"
  19 #include "segtype.h"
  20 #include "display.h"
  21 #include "text_export.h"
  22 #include "text_import.h"
  23 #include "config.h"
  24 #include "str_list.h"
  25 #include "targets.h"
  26 #include "lvm-string.h"
  27 #include "activate.h"
  28 #include "str_list.h"
  29 #include "metadata.h"
  30
  31 static const char *_errseg_name(const struct lv_segment *seg)
  32 {
  33         return seg->segtype->name;
  34 }
  35
  36 static int _errseg_merge_segments(struct lv_segment *seg1, struct lv_segment *seg2)
  37 {
  38         seg1->len += seg2->len;
  39         seg1->area_len += seg2->area_len;
  40
  41         return 1;
  42 }
  43
  44 #ifdef DEVMAPPER_SUPPORT
  45 static int _errseg_add_target_line(struct dev_manager *dm __attribute((unused)),
  46                                 struct dm_pool *mem __attribute((unused)),
  47                                 struct cmd_context *cmd __attribute((unused)),
  48                                 void **target_state __attribute((unused)),
  49                                 struct lv_segment *seg __attribute((unused)),
  50                                 struct dm_tree_node *node, uint64_t len,
  51                                 uint32_t *pvmove_mirror_count __attribute((unused)))
  52 {
  53         return dm_tree_node_add_error_target(node, len);
  54 }
  55
  56 static int _errseg_target_present(struct cmd_context *cmd,
  57                                   const struct lv_segment *seg __attribute((unused)),
  58                                   unsigned *attributes __attribute((unused)))
  59 {
  60         static int _errseg_checked = 0;
  61         static int _errseg_present = 0;
  62
  63         /* Reported truncated in older kernels */
  64         if (!_errseg_checked &&
  65             (target_present(cmd, "error", 0) ||
  66              target_present(cmd, "erro", 0)))
  67                 _errseg_present = 1;
  68
  69         _errseg_checked = 1;
  70         return _errseg_present;
  71 }
  72 #endif
  73
  74 static int _errseg_modules_needed(struct dm_pool *mem,
  75                                   const struct lv_segment *seg __attribute((unused)),
  76                                   struct dm_list *modules)
  77 {
  78         if (!str_list_add(mem, modules, "error")) {
  79                 log_error("error module string list allocation failed");
  80                 return 0;
  81         }
  82
  83         return 1;
  84 }
  85
  86 static void _errseg_destroy(const struct segment_type *segtype)
  87 {
  88         dm_free((void *)segtype);
  89 }
  90
  91 static struct segtype_handler _error_ops = {
  92         .name = _errseg_name,
  93         .merge_segments = _errseg_merge_segments,
  94 #ifdef DEVMAPPER_SUPPORT
  95         .add_target_line = _errseg_add_target_line,
  96         .target_present = _errseg_target_present,
  97 #endif
  98         .modules_needed = _errseg_modules_needed,
  99         .destroy = _errseg_destroy,
 100 };
 101
 102 struct segment_type *init_error_segtype(struct cmd_context *cmd)
 103 {
 104         struct segment_type *segtype = dm_malloc(sizeof(*segtype));
 105
 106         if (!segtype)
 107                 return_NULL;
 108
 109         segtype->cmd = cmd;
 110         segtype->ops = &_error_ops;
 111         segtype->name = "error";
 112         segtype->private = NULL;
 113         segtype->flags = SEG_CAN_SPLIT | SEG_VIRTUAL | SEG_CANNOT_BE_ZEROED;
 114
 115         log_very_verbose("Initialised segtype: %s", segtype->name);
 116
 117         return segtype;
 118 }