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129 lines
2.7 KiB
129 lines
2.7 KiB
2 months ago
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/*
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* UCW Library -- Configuration files: journaling
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*
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* (c) 2001--2006 Robert Spalek <robert@ucw.cz>
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* (c) 2003--2012 Martin Mares <mj@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#include <ucw/lib.h>
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#include <ucw/conf.h>
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#include <ucw/getopt.h>
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#include <ucw/conf-internal.h>
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#include <ucw/mempool.h>
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#include <string.h>
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struct old_pools {
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struct old_pools *prev;
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struct mempool *pool;
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}; // link-list of older cf_pool's
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struct cf_journal_item {
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struct cf_journal_item *prev;
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byte *ptr;
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uint len;
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byte copy[0];
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};
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void
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cf_set_journalling(int enable)
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{
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struct cf_context *cc = cf_get_context();
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ASSERT(!cc->journal);
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cc->enable_journal = enable;
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}
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void
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cf_journal_block(void *ptr, uint len)
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{
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struct cf_context *cc = cf_get_context();
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if (!cc->enable_journal)
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return;
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struct cf_journal_item *ji = cf_malloc(sizeof(struct cf_journal_item) + len);
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ji->prev = cc->journal;
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ji->ptr = ptr;
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ji->len = len;
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memcpy(ji->copy, ptr, len);
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cc->journal = ji;
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}
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void
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cf_journal_swap(void)
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// swaps the contents of the memory and the journal, and reverses the list
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{
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struct cf_context *cc = cf_get_context();
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struct cf_journal_item *curr, *prev, *next;
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for (next=NULL, curr=cc->journal; curr; next=curr, curr=prev)
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{
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prev = curr->prev;
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curr->prev = next;
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for (uint i=0; i<curr->len; i++)
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{
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byte x = curr->copy[i];
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curr->copy[i] = curr->ptr[i];
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curr->ptr[i] = x;
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}
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}
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cc->journal = next;
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}
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struct cf_journal_item *
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cf_journal_new_transaction(uint new_pool)
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{
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struct cf_context *cc = cf_get_context();
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if (new_pool)
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cc->pool = mp_new(1<<10);
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struct cf_journal_item *oldj = cc->journal;
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cc->journal = NULL;
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return oldj;
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}
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void
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cf_journal_commit_transaction(uint new_pool, struct cf_journal_item *oldj)
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{
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struct cf_context *cc = cf_get_context();
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if (new_pool)
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{
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struct old_pools *p = cf_malloc(sizeof(struct old_pools));
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p->prev = cc->pools;
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p->pool = cc->pool;
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cc->pools = p;
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}
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if (oldj)
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{
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struct cf_journal_item **j = &cc->journal;
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while (*j)
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j = &(*j)->prev;
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*j = oldj;
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}
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}
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void
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cf_journal_rollback_transaction(uint new_pool, struct cf_journal_item *oldj)
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{
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struct cf_context *cc = cf_get_context();
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if (!cc->enable_journal)
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return;
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cf_journal_swap();
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cc->journal = oldj;
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if (new_pool)
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{
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mp_delete(cc->pool);
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cc->pool = cc->pools ? cc->pools->pool : NULL;
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}
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}
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void
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cf_journal_delete(void)
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{
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struct cf_context *cc = cf_get_context();
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for (struct old_pools *p=cc->pools; p; p=cc->pools)
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{
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cc->pools = p->prev;
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mp_delete(p->pool);
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}
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}
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