stasis-aries-wal/src/lladd/logger/logEntry.c

/*---
This software is copyrighted by the Regents of the University of
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associated with the software unless explicitly disclaimed in
individual files.
                                                                                                                                  
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each file where they apply.
                                                                                                                                  
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POSSIBILITY OF SUCH DAMAGE.
                                                                                                                                  
THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, AND
THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
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U.S. government, the Government shall have only "Restricted Rights" in
the software and related documentation as defined in the Federal
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authors grant the U.S. Government and others acting in its behalf
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terms specified in this license.
---*/

#include <config.h>
#include <lladd/common.h>

#include <lladd/transactional.h>

#include <assert.h>
#include <lladd/operations.h>

LogEntry * allocCommonLogEntry(lsn_t prevLSN, int xid, unsigned int type) {
  LogEntry * ret = malloc(sizeof(struct __raw_log_entry));
  ret->LSN     = -1;
  ret->prevLSN = prevLSN;
  ret->xid     = xid;
  ret->type    = type;
  //printf ("logEntry.c: Log entry length is %ld\n", sizeof(struct __raw_log_entry));
  return ret;
}

const byte * getUpdateArgs(const LogEntry * ret) {
  assert(ret->type == UPDATELOG);
  if(ret->contents.update.argSize == 0) {
    return NULL;
  } else {
    return ((byte*)ret) + sizeof(struct __raw_log_entry) + sizeof(UpdateLogEntry);
  }
}

const byte * getUpdatePreImage(const LogEntry * ret) {
  assert(ret->type == UPDATELOG);
  if(operationsTable[ret->contents.update.funcID].undo != NO_INVERSE && 
     operationsTable[ret->contents.update.funcID].undo != NO_INVERSE_WHOLE_PAGE) {
    return NULL;
  } else {
    return ((byte*)ret) + sizeof(struct __raw_log_entry) + sizeof(UpdateLogEntry) + ret->contents.update.argSize;
  }
}

LogEntry * allocUpdateLogEntry(lsn_t prevLSN, int xid, 
			       unsigned int funcID, recordid rid, 
			       const byte * args, unsigned int argSize, const byte * preImage) {
  int invertible = operationsTable[funcID].undo != NO_INVERSE;
  int whole_page_phys = operationsTable[funcID].undo == NO_INVERSE_WHOLE_PAGE;
  LogEntry * ret = malloc(sizeof(struct __raw_log_entry) + sizeof(UpdateLogEntry) + argSize +
			  ((!invertible) ? rid.size : 0) + (whole_page_phys ? PAGE_SIZE : 0));
  ret->LSN = -1;
  ret->prevLSN = prevLSN;
  ret->xid = xid;
  ret->type = UPDATELOG;
  ret->contents.update.funcID = funcID;
  ret->contents.update.rid    = rid;
  ret->contents.update.argSize = argSize;
  
  if(argSize) {
    memcpy((void*)getUpdateArgs(ret), args, argSize);
  } 
  if(!invertible) {
    memcpy((void*)getUpdatePreImage(ret), preImage, rid.size);
  }
  if(whole_page_phys) {
    memcpy((void*)getUpdatePreImage(ret), preImage, PAGE_SIZE);
  }

  return ret;

}

LogEntry * allocCLRLogEntry   (lsn_t prevLSN, int xid, 
			       lsn_t thisUpdateLSN, recordid rid, lsn_t undoNextLSN) {
  LogEntry * ret = malloc(sizeof(struct __raw_log_entry) + sizeof(CLRLogEntry));
  ret->LSN = -1;
  ret->prevLSN = prevLSN;
  ret->xid = xid;
  ret->type = CLRLOG;

  ret->contents.clr.thisUpdateLSN = thisUpdateLSN;
  ret->contents.clr.rid           = rid;
  ret->contents.clr.undoNextLSN   = undoNextLSN;
  
  return ret;
}



long sizeofLogEntry(const LogEntry * log) {
  switch (log->type) {
  case CLRLOG:
    return sizeof(struct __raw_log_entry) + sizeof(CLRLogEntry);
  case UPDATELOG: 
    return sizeof(struct __raw_log_entry) + sizeof(UpdateLogEntry) + log->contents.update.argSize + 
      ((operationsTable[log->contents.update.funcID].undo == NO_INVERSE) ? log->contents.update.rid.size : 0) +
      ((operationsTable[log->contents.update.funcID].undo == NO_INVERSE_WHOLE_PAGE) ? PAGE_SIZE : 0) ;
  default:
    return sizeof(struct __raw_log_entry);
  }
}