diff options
Diffstat (limited to 'src/include/storage/smgr.h')
| -rw-r--r-- | src/include/storage/smgr.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/src/include/storage/smgr.h b/src/include/storage/smgr.h index 3cf02776311..d7e267729d3 100644 --- a/src/include/storage/smgr.h +++ b/src/include/storage/smgr.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/storage/smgr.h,v 1.69 2010/01/02 16:58:08 momjian Exp $ + * $PostgreSQL: pgsql/src/include/storage/smgr.h,v 1.70 2010/02/09 21:43:30 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -43,6 +43,17 @@ typedef struct SMgrRelationData /* pointer to owning pointer, or NULL if none */ struct SMgrRelationData **smgr_owner; + /* + * These next three fields are not actually used or manipulated by smgr, + * except that they are reset to InvalidBlockNumber upon a cache flush + * event (in particular, upon truncation of the relation). Higher levels + * store cached state here so that it will be reset when truncation + * happens. In all three cases, InvalidBlockNumber means "unknown". + */ + BlockNumber smgr_targblock; /* current insertion target block */ + BlockNumber smgr_fsm_nblocks; /* last known size of fsm fork */ + BlockNumber smgr_vm_nblocks; /* last known size of vm fork */ + /* additional public fields may someday exist here */ /* |