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107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-3.0-or-later
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// Copyright (C) 2013 Andrea Mazzoleni
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#include "os/portable.h"
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#include "util.h"
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#include "elem.h"
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#include "import.h"
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#include "state.h"
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#include "parity.h"
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#include "handle.h"
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#include "raid/raid.h"
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/****************************************************************************/
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/* rehash */
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void state_rehash(struct snapraid_state* state)
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{
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block_off_t blockmax;
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block_off_t i;
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int has_pending_dealloc = 0;
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blockmax = parity_allocated_size(state);
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/* check if a rehash is already in progress */
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if (state->prevhash != HASH_UNDEFINED) {
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/* LCOV_EXCL_START */
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log_tag("summary:exit:already_in_progress\n");
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log_fatal(EUSER, "You already have a rehash in progress.\n");
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exit(EXIT_FAILURE);
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/* LCOV_EXCL_STOP */
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}
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if (state->hash == state->besthash) {
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/* LCOV_EXCL_START */
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log_tag("summary:exit:not_required\n");
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log_fatal(EUSER, "You are already using the best hash for your platform.\n");
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exit(EXIT_FAILURE);
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/* LCOV_EXCL_STOP */
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}
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/* deleted-only positions are not counted in unsynced_blocks, but their hashes still need the current generation */
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for (tommy_node* node = state->disklist; node != 0; node = node->next) {
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struct snapraid_disk* disk = node->data;
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if (!tommy_list_empty(&disk->dealloclist)) {
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has_pending_dealloc = 1;
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break;
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}
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}
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/* a rehash can start only from a fully synchronized state */
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if (state->unsynced_blocks != 0 || has_pending_dealloc) {
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/* LCOV_EXCL_START */
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log_tag("summary:exit:sync_required\n");
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log_fatal(EUSER, "You cannot start a rehash with an incomplete sync.\n");
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log_fatal(EUSER, "Run 'snapraid sync' first.\n");
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exit(EXIT_FAILURE);
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/* LCOV_EXCL_STOP */
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}
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/* copy the present hash as previous one */
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state->prevhash = state->hash;
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memcpy(state->prevhashseed, state->hashseed, HASH_MAX);
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/* set the new hash and seed */
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state->hash = state->besthash;
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if (os_randomize(state->hashseed, HASH_MAX) != 0) {
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/* LCOV_EXCL_START */
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log_fatal(errno, "Failed to get random values.\n");
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exit(EXIT_FAILURE);
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/* LCOV_EXCL_STOP */
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}
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/* mark all the block for rehashing */
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for (i = 0; i < blockmax; ++i) {
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snapraid_info info;
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/* if it's unused */
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info = info_get(&state->infoarr, i);
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if (info == 0) {
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/* skip it */
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continue;
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}
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if (info_get_rehash(info)) {
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/* LCOV_EXCL_START */
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log_fatal(EINTERNAL, "Internal inconsistency for a rehash already in progress\n");
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os_abort();
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/* LCOV_EXCL_STOP */
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}
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/* enable the rehash */
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info = info_set_rehash(info);
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/* save it */
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info_set(&state->infoarr, i, info);
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}
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/* save the new content file */
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state->need_write = 1;
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msg_status("A rehash is now scheduled. It will take place progressively in the next\n");
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msg_status("'sync' and 'scrub' commands. You can check the rehash progress using the\n");
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msg_status("'status' command.\n");
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log_tag("summary:exit:scheduled\n");
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}
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