Line data    Source code

       1             : /*
       2             :  * Copyright (C) 2013 Andrea Mazzoleni
       3             :  *
       4             :  * This program is free software: you can redistribute it and/or modify
       5             :  * it under the terms of the GNU General Public License as published by
       6             :  * the Free Software Foundation, either version 3 of the License, or
       7             :  * (at your option) any later version.
       8             :  *
       9             :  * This program is distributed in the hope that it will be useful,
      10             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12             :  * GNU General Public License for more details.
      13             :  *
      14             :  * You should have received a copy of the GNU General Public License
      15             :  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
      16             :  */
      17             : 
      18             : #include "portable.h"
      19             : 
      20             : #include "util.h"
      21             : #include "elem.h"
      22             : #include "import.h"
      23             : #include "state.h"
      24             : #include "parity.h"
      25             : #include "handle.h"
      26             : #include "raid/raid.h"
      27             : 
      28             : /****************************************************************************/
      29             : /* rehash */
      30             : 
      31           1 : void state_rehash(struct snapraid_state* state)
      32             : {
      33             :         block_off_t blockmax;
      34             :         block_off_t i;
      35             : 
      36           1 :         blockmax = parity_allocated_size(state);
      37             : 
      38             :         /* check if a rehash is already in progress */
      39           1 :         if (state->prevhash != HASH_UNDEFINED) {
      40             :                 /* LCOV_EXCL_START */
      41             :                 log_fatal("You already have a rehash in progress.\n");
      42             :                 exit(EXIT_FAILURE);
      43             :                 /* LCOV_EXCL_STOP */
      44             :         }
      45             : 
      46           1 :         if (state->hash == state->besthash) {
      47             :                 /* LCOV_EXCL_START */
      48             :                 log_fatal("You are already using the best hash for your platform.\n");
      49             :                 exit(EXIT_FAILURE);
      50             :                 /* LCOV_EXCL_STOP */
      51             :         }
      52             : 
      53             :         /* copy the present hash as previous one */
      54           1 :         state->prevhash = state->hash;
      55           1 :         memcpy(state->prevhashseed, state->hashseed, HASH_MAX);
      56             : 
      57             :         /* set the new hash and seed */
      58           1 :         state->hash = state->besthash;
      59           1 :         if (randomize(state->hashseed, HASH_MAX) != 0) {
      60             :                 /* LCOV_EXCL_START */
      61             :                 log_fatal("Failed to get random values.\n");
      62             :                 exit(EXIT_FAILURE);
      63             :                 /* LCOV_EXCL_STOP */
      64             :         }
      65             : 
      66             :         /* mark all the block for rehashing */
      67        9216 :         for (i = 0; i < blockmax; ++i) {
      68             :                 snapraid_info info;
      69             : 
      70             :                 /* if it's unused */
      71        9215 :                 info = info_get(&state->infoarr, i);
      72        9215 :                 if (info == 0) {
      73             :                         /* skip it */
      74           0 :                         continue;
      75             :                 }
      76             : 
      77        9215 :                 if (info_get_rehash(info)) {
      78             :                         /* LCOV_EXCL_START */
      79             :                         log_fatal("Internal inconsistency for a rehash already in progress\n");
      80             :                         os_abort();
      81             :                         /* LCOV_EXCL_STOP */
      82             :                 }
      83             : 
      84             :                 /* enable the rehash */
      85        9215 :                 info = info_set_rehash(info);
      86             : 
      87             :                 /* save it */
      88        9215 :                 info_set(&state->infoarr, i, info);
      89             :         }
      90             : 
      91             :         /* save the new content file */
      92           1 :         state->need_write = 1;
      93             : 
      94           1 :         msg_status("A rehash is now scheduled. It will take place progressively in the next\n");
      95           1 :         msg_status("'sync' and 'scrub' commands. You can check the rehash progress using the\n");
      96           1 :         msg_status("'status' command.\n");
      97           1 : }
      98             :