snapraid/cmdline/rehash.c

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2019-01-07 14:06:15 +01:00
/*
* Copyright (C) 2013 Andrea Mazzoleni
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "portable.h"
#include "util.h"
#include "elem.h"
#include "import.h"
#include "state.h"
#include "parity.h"
#include "handle.h"
#include "raid/raid.h"
/****************************************************************************/
/* rehash */
void state_rehash(struct snapraid_state* state)
{
block_off_t blockmax;
block_off_t i;
blockmax = parity_allocated_size(state);
/* check if a rehash is already in progress */
if (state->prevhash != HASH_UNDEFINED) {
/* LCOV_EXCL_START */
log_fatal("You already have a rehash in progress.\n");
exit(EXIT_FAILURE);
/* LCOV_EXCL_STOP */
}
if (state->hash == state->besthash) {
/* LCOV_EXCL_START */
log_fatal("You are already using the best hash for your platform.\n");
exit(EXIT_FAILURE);
/* LCOV_EXCL_STOP */
}
/* copy the present hash as previous one */
state->prevhash = state->hash;
memcpy(state->prevhashseed, state->hashseed, HASH_MAX);
/* set the new hash and seed */
state->hash = state->besthash;
if (randomize(state->hashseed, HASH_MAX) != 0) {
/* LCOV_EXCL_START */
log_fatal("Failed to get random values.\n");
exit(EXIT_FAILURE);
/* LCOV_EXCL_STOP */
}
/* mark all the block for rehashing */
for (i = 0; i < blockmax; ++i) {
snapraid_info info;
/* if it's unused */
info = info_get(&state->infoarr, i);
if (info == 0) {
/* skip it */
continue;
}
if (info_get_rehash(info)) {
/* LCOV_EXCL_START */
log_fatal("Internal inconsistency for a rehash already in progress\n");
os_abort();
/* LCOV_EXCL_STOP */
}
/* enable the rehash */
info = info_set_rehash(info);
/* save it */
info_set(&state->infoarr, i, info);
}
/* save the new content file */
state->need_write = 1;
msg_status("A rehash is now scheduled. It will take place progressively in the next\n");
msg_status("'sync' and 'scrub' commands. You can check the rehash progress using the\n");
msg_status("'status' command.\n");
}