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      1 /*	$NetBSD: errseg.c,v 1.1.1.2 2009/12/02 00:26:45 haad Exp $	*/
      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 }
    119