diff options
Diffstat (limited to 'src/backend/storage/smgr/md.c')
| -rw-r--r-- | src/backend/storage/smgr/md.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c index 49b2956d981..fe12e1cc5f3 100644 --- a/src/backend/storage/smgr/md.c +++ b/src/backend/storage/smgr/md.c @@ -7,7 +7,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/storage/smgr/md.c,v 1.26 1998/01/07 21:05:44 momjian Exp $ + * $Header: /cvsroot/pgsql/src/backend/storage/smgr/md.c,v 1.27 1998/01/13 04:04:31 scrappy Exp $ * *------------------------------------------------------------------------- */ @@ -20,14 +20,12 @@ #include "postgres.h" #include "miscadmin.h" /* for DataDir */ +#include "catalog/catalog.h" #include "storage/block.h" #include "storage/fd.h" #include "storage/smgr.h" /* where the declarations go */ -#include "storage/fd.h" #include "utils/mcxt.h" #include "utils/rel.h" -#include "utils/palloc.h" -#include "catalog/catalog.h" #undef DIAGNOSTIC @@ -59,7 +57,22 @@ static MemoryContext MdCxt; #define MDFD_DIRTY (uint16) 0x01 #define MDFD_FREE (uint16) 0x02 -#define RELSEG_SIZE 262144 /* (2 ** 31) / 8192 -- 2GB file */ +/* + * RELSEG_SIZE appears to be the number of segments that can + * be in a disk file. It was defined as 262144 based on 8k + * blocks, but now that the block size can be changed, this + * has to be calculated at compile time. Otherwise, the file + * size limit would not work out to 2-gig (2147483648). + * + * The number needs to be (2 ** 31) / BLCKSZ, but to be keep + * the math under MAXINT, pre-divide by 256 and use ... + * + * (((2 ** 23) / BLCKSZ) * (2 ** 8)) + * + * 07 Jan 98 darrenk + */ + +#define RELSEG_SIZE ((8388608 / BLCKSZ) * 256) /* routines declared here */ static MdfdVec *_mdfd_openseg(Relation reln, int segno, int oflags); |