sbin/hammer/cmd_strip.c

   1 /*
   2  * Copyright (c) 2007-2016 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "hammer.h"
  36
  37 static void hammer_strip_bigblock(int zone, hammer_off_t offset);
  38 static void hammer_ask_yn(void);
  39
  40 void
  41 hammer_cmd_strip(void)
  42 {
  43         struct volume_info *volume;
  44         hammer_blockmap_t rootmap;
  45         hammer_blockmap_layer1_t layer1;
  46         hammer_blockmap_layer2_t layer2;
  47         struct buffer_info *buffer1 = NULL;
  48         struct buffer_info *buffer2 = NULL;
  49         hammer_off_t layer1_offset;
  50         hammer_off_t layer2_offset;
  51         hammer_off_t phys_offset;
  52         hammer_off_t block_offset;
  53         hammer_off_t offset;
  54         int i, zone = HAMMER_ZONE_FREEMAP_INDEX;
  55
  56         hammer_ask_yn();
  57
  58         volume = get_root_volume();
  59         rootmap = &volume->ondisk->vol0_blockmap[zone];
  60         assert(rootmap->phys_offset != 0);
  61
  62         for (phys_offset = HAMMER_ZONE_ENCODE(zone, 0);
  63              phys_offset < HAMMER_ZONE_ENCODE(zone, HAMMER_OFF_LONG_MASK);
  64              phys_offset += HAMMER_BLOCKMAP_LAYER2) {
  65                 /*
  66                  * Dive layer 1.
  67                  */
  68                 layer1_offset = rootmap->phys_offset +
  69                                 HAMMER_BLOCKMAP_LAYER1_OFFSET(phys_offset);
  70                 layer1 = get_buffer_data(layer1_offset, &buffer1, 0);
  71
  72                 if (layer1->phys_offset == HAMMER_BLOCKMAP_UNAVAIL)
  73                         continue;
  74
  75                 for (block_offset = 0;
  76                      block_offset < HAMMER_BLOCKMAP_LAYER2;
  77                      block_offset += HAMMER_BIGBLOCK_SIZE) {
  78                         offset = phys_offset + block_offset;
  79                         /*
  80                          * Dive layer 2, each entry represents a big-block.
  81                          */
  82                         layer2_offset = layer1->phys_offset +
  83                                         HAMMER_BLOCKMAP_LAYER2_OFFSET(block_offset);
  84                         layer2 = get_buffer_data(layer2_offset, &buffer2, 0);
  85
  86                         if (layer2->zone == HAMMER_ZONE_BTREE_INDEX ||
  87                             layer2->zone == HAMMER_ZONE_META_INDEX) {
  88                                 hammer_strip_bigblock(layer2->zone, offset);
  89                                 layer2->zone = HAMMER_ZONE_UNAVAIL_INDEX;
  90                                 layer2->append_off = HAMMER_BIGBLOCK_SIZE;
  91                                 layer2->bytes_free = 0;
  92                                 hammer_crc_set_layer2(HammerVersion, layer2);
  93                                 buffer2->cache.modified = 1;
  94                         } else if (layer2->zone == HAMMER_ZONE_UNAVAIL_INDEX) {
  95                                 break;
  96                         }
  97                 }
  98         }
  99         rel_buffer(buffer1);
 100         rel_buffer(buffer2);
 101
 102         for (i = 0; i < HAMMER_MAX_VOLUMES; i++) {
 103                 volume = get_volume(i);
 104                 if (volume) {
 105                         printf("%s\n", volume->name);
 106                         bzero(volume->ondisk, sizeof(*volume->ondisk));
 107                         memcpy(&volume->ondisk->vol_signature, "STRIPPED", 8);
 108                 }
 109         }
 110
 111         flush_all_volumes();
 112 }
 113
 114 static void
 115 hammer_strip_bigblock(int zone, hammer_off_t offset)
 116 {
 117         struct buffer_info *buffer = NULL;
 118         int i;
 119
 120         assert(hammer_is_index_record(zone));
 121         assert((offset & HAMMER_BIGBLOCK_MASK64) == 0);
 122         assert((offset & HAMMER_BUFMASK) == 0);
 123         offset = hammer_xlate_to_zoneX(zone, offset);
 124
 125         /*
 126          * This format is taken from hammer blockmap.
 127          */
 128         if (VerboseOpt)
 129                 printf("%016jx zone=%-2d vol=%-3d L1#=%-6d L2#=%-6d L1=%-7lu L2=%-7lu\n",
 130                         offset,
 131                         zone,
 132                         HAMMER_VOL_DECODE(offset),
 133                         HAMMER_BLOCKMAP_LAYER1_INDEX(offset),
 134                         HAMMER_BLOCKMAP_LAYER2_INDEX(offset),
 135                         HAMMER_BLOCKMAP_LAYER1_OFFSET(offset),
 136                         HAMMER_BLOCKMAP_LAYER2_OFFSET(offset));
 137         else
 138                 printf("%016jx\n", offset);
 139
 140         for (i = 0; i < HAMMER_BIGBLOCK_SIZE; i += HAMMER_BUFSIZE) {
 141                 get_buffer_data(offset + i, &buffer, 1);
 142                 assert(buffer);
 143         }
 144 }
 145
 146 static void
 147 hammer_ask_yn(void)
 148 {
 149         struct volume_info *volume;
 150         int i;
 151
 152         volume = get_root_volume();
 153
 154         /*
 155          * This format is taken from hammer pfs-destroy.
 156          */
 157         printf("You have requested that HAMMER filesystem (%s) be stripped\n",
 158                 volume->ondisk->vol_label);
 159         printf("Do you really want to do this? [y/n] ");
 160         fflush(stdout);
 161
 162         if (getyn() == 0)
 163                 errx(1, "No action taken");
 164
 165         printf("Stripping HAMMER filesystem (%s)", volume->ondisk->vol_label);
 166
 167         if (DebugOpt) {
 168                 printf("\n");
 169         } else {
 170                 printf(" in");
 171                 for (i = 5; i; --i) {
 172                         printf(" %d", i);
 173                         fflush(stdout);
 174                         sleep(1);
 175                 }
 176                 printf(".. starting destruction pass\n");
 177         }
 178 }