diff options
| -rw-r--r-- | src/backend/storage/smgr/md.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c index 2ccb0faceb5..235ba7e1914 100644 --- a/src/backend/storage/smgr/md.c +++ b/src/backend/storage/smgr/md.c @@ -21,6 +21,7 @@ */ #include "postgres.h" +#include <limits.h> #include <unistd.h> #include <fcntl.h> #include <sys/file.h> @@ -65,6 +66,15 @@ * out to an unlinked old copy of a segment file that will eventually * disappear. * + * RELSEG_SIZE must fit into BlockNumber; but since we expose its value + * as an integer GUC, it actually needs to fit in signed int. It's worth + * having a cross-check for this since configure's --with-segsize options + * could let people select insane values. + */ +StaticAssertDecl(RELSEG_SIZE > 0 && RELSEG_SIZE <= INT_MAX, + "RELSEG_SIZE must fit in an integer"); + +/* * File descriptors are stored in the per-fork md_seg_fds arrays inside * SMgrRelation. The length of these arrays is stored in md_num_open_segs. * Note that a fork's md_num_open_segs having a specific value does not |