예제 #1
0
        static void resetLogBuffer(/*out*/JSectHeader& h, AlignedBuilder& bb) {
            bb.reset();

            h.setSectionLen(0xffffffff);  // total length, will fill in later
            h.seqNumber = getLastDataFileFlushTime();
            h.fileId = j.curFileId();
        }
예제 #2
0
파일: dur.cpp 프로젝트: jit/mongo
        /** caller handles locking */
        static bool PREPLOGBUFFER(AlignedBuilder& bb) { 
            bb.reset();

            unsigned *lenInBlockHeader;
            {
                // JSectHeader
                bb.appendStr("\nHH\n", false);
                lenInBlockHeader = (unsigned *) bb.skip(4);
            }

            string lastFilePath;

            {
                scoped_lock lk(privateViews._mutex());
                for( vector<WriteIntent>::iterator i = wi._writes.begin(); i != wi._writes.end(); i++ ) {
                    size_t ofs;
                    MongoMMF *mmf = privateViews._find(i->p, ofs);
                    if( mmf == 0 ) {
                        journalingFailure("view pointer cannot be resolved");
                    }
                    else {
                        if( !mmf->dirty() )
                            mmf->dirty() = true; // usually it will already be dirty so don't bother writing then
                        {
                            size_t ofs = ((char *)i->p) - ((char*)mmf->getView().p);
                            i->w_ptr = ((char*)mmf->view_write()) + ofs;
                        }
                        if( mmf->filePath() != lastFilePath ) { 
                            lastFilePath = mmf->filePath();
                            JDbContext c;
                            bb.appendStruct(c);
                            bb.appendStr(lastFilePath);
                        }
                        JEntry e;
                        e.len = i->len;
                        e.fileNo = mmf->fileSuffixNo();
                        bb.appendStruct(e);
                        bb.appendBuf(i->p, i->len);
                    }
                }
            }

            {
                JSectFooter f;
                f.hash = 0;
                bb.appendStruct(f);
            }

            {
                unsigned L = (bb.len() + 8191) & 0xffffe000; // fill to alignment
                dassert( L >= (unsigned) bb.len() );
                *lenInBlockHeader = L;
                unsigned padding = L - bb.len();
                bb.skip(padding);
                dassert( bb.len() % 8192 == 0 );
            }

            return true;
        }