Check RELSEG_SIZE when postmaster starting up.

this is neccesary to make sure that the backend and
the database uses same RELSEG_SIZE.

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 592a3a5bf724e194ef3aabb5a36395459b9cc069..428ca7998e85a4a23d41ffa52f891220ded06d75 100644 (file)
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -97,7 +97,13 @@ typedef struct ControlFileData
    XLogRecPtr      checkPoint;     /* last check point record ptr */
    time_t          time;           /* time stamp of last modification */
    DBState         state;          /* */
+
+   /*
+    * following data used to make sure that configurations for this DB
+    * do not conflict with the backend
+    */
    uint32          blcksz;         /* block size for this DB */
+   uint32          relseg_size;        /* segmented file's block number */
    /* MORE DATA FOLLOWS AT THE END OF THIS STRUCTURE
     * - locations of data dirs 
     */
@@ -1164,6 +1170,7 @@ BootStrapXLOG()
    ControlFile->time = time(NULL);
    ControlFile->state = DB_SHUTDOWNED;
    ControlFile->blcksz = BLCKSZ;
+   ControlFile->relseg_size = RELSEG_SIZE;
 
    if (write(fd, buffer, BLCKSZ) != BLCKSZ)
        elog(STOP, "BootStrapXLOG failed to write control file: %d", errno);
@@ -1254,6 +1261,9 @@ tryAgain:
    if (ControlFile->blcksz != BLCKSZ)
        elog(STOP, "database was initialized in BLCKSZ(%d), but the backend was compiled in BLCKSZ(%d)",ControlFile->blcksz,BLCKSZ);
 
+   if (ControlFile->relseg_size != RELSEG_SIZE)
+       elog(STOP, "database was initialized in RELSEG_SIZE(%d), but the backend was compiled in RELSEG_SIZE(%d)",ControlFile->relseg_size, RELSEG_SIZE);
+
    if (ControlFile->state == DB_SHUTDOWNED)
        elog(LOG, "Data Base System was shutdowned at %s",
                    str_time(ControlFile->time));