Modify dynamic shared memory code to use Size rather than uint64.

This is more consistent with what we do elsewhere.

src/backend/storage/ipc/dsm.c

@@ -67,7 +67,7 @@ struct dsm_segment
 	uint32		control_slot;		/* Slot in control segment. */
 	void       *impl_private;		/* Implementation-specific private data. */
 	void	   *mapped_address;		/* Mapping address, or NULL if unmapped. */
-	uint64		mapped_size;		/* Size of our mapping. */
+	Size		mapped_size;		/* Size of our mapping. */
 };
 
 /* Shared-memory state for a dynamic shared memory segment. */
@@ -94,7 +94,7 @@ static void dsm_postmaster_shutdown(int code, Datum arg);
 static void dsm_backend_shutdown(int code, Datum arg);
 static dsm_segment *dsm_create_descriptor(void);
 static bool dsm_control_segment_sane(dsm_control_header *control,
-						 uint64 mapped_size);
+						 Size mapped_size);
 static uint64 dsm_control_bytes_needed(uint32 nitems);
 
 /* Has this backend initialized the dynamic shared memory system yet? */
@@ -128,7 +128,7 @@ static dlist_head dsm_segment_list = DLIST_STATIC_INIT(dsm_segment_list);
  */
 static dsm_handle dsm_control_handle;
 static dsm_control_header *dsm_control;
-static uint64 dsm_control_mapped_size = 0;
+static Size dsm_control_mapped_size = 0;
 static void	*dsm_control_impl_private = NULL;
 
 /*
@@ -142,7 +142,7 @@ dsm_postmaster_startup(void)
 {
 	void	   *dsm_control_address = NULL;
 	uint32		maxitems;
-	uint64		segsize;
+	Size		segsize;
 
 	Assert(!IsUnderPostmaster);
 
@@ -214,8 +214,8 @@ dsm_cleanup_using_control_segment(void)
 	void	   *junk_mapped_address = NULL;
 	void	   *impl_private = NULL;
 	void	   *junk_impl_private = NULL;
-	uint64		mapped_size = 0;
-	uint64		junk_mapped_size = 0;
+	Size		mapped_size = 0;
+	Size		junk_mapped_size = 0;
 	uint32		nitems;
 	uint32		i;
 	dsm_handle	old_control_handle;
@@ -453,7 +453,7 @@ dsm_postmaster_shutdown(int code, Datum arg)
 	void	   *dsm_control_address;
 	void	   *junk_mapped_address = NULL;
 	void	   *junk_impl_private = NULL;
-	uint64		junk_mapped_size = 0;
+	Size		junk_mapped_size = 0;
 
 	/*
 	 * If some other backend exited uncleanly, it might have corrupted the
@@ -562,7 +562,7 @@ dsm_backend_startup(void)
  * Create a new dynamic shared memory segment.
  */
 dsm_segment *
-dsm_create(uint64 size)
+dsm_create(Size size)
 {
 	dsm_segment	   *seg = dsm_create_descriptor();
 	uint32			i;
@@ -733,7 +733,7 @@ dsm_backend_shutdown(int code, Datum arg)
  * address.  For the caller's convenience, we return the mapped address.
  */
 void *
-dsm_resize(dsm_segment *seg, uint64 size)
+dsm_resize(dsm_segment *seg, Size size)
 {
 	Assert(seg->control_slot != INVALID_CONTROL_SLOT);
 	dsm_impl_op(DSM_OP_RESIZE, seg->handle, size, &seg->impl_private,
@@ -887,7 +887,7 @@ dsm_segment_address(dsm_segment *seg)
 /*
  * Get the size of a mapping.
  */
-uint64
+Size
 dsm_segment_map_length(dsm_segment *seg)
 {
 	Assert(seg->mapped_address != NULL);
@@ -947,7 +947,7 @@ dsm_create_descriptor(void)
  * our segments at all.
  */
 static bool
-dsm_control_segment_sane(dsm_control_header *control, uint64 mapped_size)
+dsm_control_segment_sane(dsm_control_header *control, Size mapped_size)
 {
 	if (mapped_size < offsetof(dsm_control_header, item))
 		return false;			/* Mapped size too short to read header. */

src/backend/storage/ipc/dsm_impl.c

@@ -69,24 +69,24 @@
 #include "utils/memutils.h"
 
 #ifdef USE_DSM_POSIX
-static bool dsm_impl_posix(dsm_op op, dsm_handle handle, uint64 request_size,
+static bool dsm_impl_posix(dsm_op op, dsm_handle handle, Size request_size,
 			   void **impl_private, void **mapped_address,
-			   uint64 *mapped_size, int elevel);
+			   Size *mapped_size, int elevel);
 #endif
 #ifdef USE_DSM_SYSV
-static bool dsm_impl_sysv(dsm_op op, dsm_handle handle, uint64 request_size,
+static bool dsm_impl_sysv(dsm_op op, dsm_handle handle, Size request_size,
 			   void **impl_private, void **mapped_address,
-			   uint64 *mapped_size, int elevel);
+			   Size *mapped_size, int elevel);
 #endif
 #ifdef USE_DSM_WINDOWS
-static bool dsm_impl_windows(dsm_op op, dsm_handle handle, uint64 request_size,
+static bool dsm_impl_windows(dsm_op op, dsm_handle handle, Size request_size,
 			  void **impl_private, void **mapped_address,
-			  uint64 *mapped_size, int elevel);
+			  Size *mapped_size, int elevel);
 #endif
 #ifdef USE_DSM_MMAP
-static bool dsm_impl_mmap(dsm_op op, dsm_handle handle, uint64 request_size,
+static bool dsm_impl_mmap(dsm_op op, dsm_handle handle, Size request_size,
 			  void **impl_private, void **mapped_address,
-			  uint64 *mapped_size, int elevel);
+			  Size *mapped_size, int elevel);
 #endif
 static int errcode_for_dynamic_shared_memory(void);
 
@@ -156,19 +156,14 @@ int dynamic_shared_memory_type;
  *-----
  */
 bool
-dsm_impl_op(dsm_op op, dsm_handle handle, uint64 request_size,
-			void **impl_private, void **mapped_address, uint64 *mapped_size,
+dsm_impl_op(dsm_op op, dsm_handle handle, Size request_size,
+			void **impl_private, void **mapped_address, Size *mapped_size,
 			int elevel)
 {
 	Assert(op == DSM_OP_CREATE || op == DSM_OP_RESIZE || request_size == 0);
 	Assert((op != DSM_OP_CREATE && op != DSM_OP_ATTACH) ||
 			(*mapped_address == NULL && *mapped_size == 0));
 
-	if (request_size > (size_t) -1)
-		ereport(ERROR,
-				(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
-				 errmsg("requested shared memory size overflows size_t")));
-
 	switch (dynamic_shared_memory_type)
 	{
 #ifdef USE_DSM_POSIX
@@ -241,8 +236,8 @@ dsm_impl_can_resize(void)
  * a different shared memory implementation.
  */
 static bool
-dsm_impl_posix(dsm_op op, dsm_handle handle, uint64 request_size,
-			   void **impl_private, void **mapped_address, uint64 *mapped_size,
+dsm_impl_posix(dsm_op op, dsm_handle handle, Size request_size,
+			   void **impl_private, void **mapped_address, Size *mapped_size,
 			   int elevel)
 {
 	char	name[64];
@@ -407,8 +402,8 @@ dsm_impl_posix(dsm_op op, dsm_handle handle, uint64 request_size,
  * those are not supported everywhere.
  */
 static bool
-dsm_impl_sysv(dsm_op op, dsm_handle handle, uint64 request_size,
-			  void **impl_private, void **mapped_address, uint64 *mapped_size,
+dsm_impl_sysv(dsm_op op, dsm_handle handle, Size request_size,
+			  void **impl_private, void **mapped_address, Size *mapped_size,
 			  int elevel)
 {
 	key_t	key;
@@ -612,9 +607,9 @@ dsm_impl_sysv(dsm_op op, dsm_handle handle, uint64 request_size,
  * when the process containing the reference exits.
  */
 static bool
-dsm_impl_windows(dsm_op op, dsm_handle handle, uint64 request_size,
+dsm_impl_windows(dsm_op op, dsm_handle handle, Size request_size,
 				 void **impl_private, void **mapped_address,
-				 uint64 *mapped_size, int elevel)
+				 Size *mapped_size, int elevel)
 {
 	char   *address;
 	HANDLE		hmap;
@@ -780,8 +775,8 @@ dsm_impl_windows(dsm_op op, dsm_handle handle, uint64 request_size,
  * directory to a ramdisk to avoid this problem, if available.
  */
 static bool
-dsm_impl_mmap(dsm_op op, dsm_handle handle, uint64 request_size,
-			  void **impl_private, void **mapped_address, uint64 *mapped_size,
+dsm_impl_mmap(dsm_op op, dsm_handle handle, Size request_size,
+			  void **impl_private, void **mapped_address, Size *mapped_size,
 			  int elevel)
 {
 	char	name[64];
@@ -892,7 +887,7 @@ dsm_impl_mmap(dsm_op op, dsm_handle handle, uint64 request_size,
 		 */
 		while (success && remaining > 0)
 		{
-			uint64	goal = remaining;
+			Size	goal = remaining;
 
 			if (goal > ZBUFFER_SIZE)
 				goal = ZBUFFER_SIZE;

src/include/storage/dsm.h

@@ -21,9 +21,9 @@ typedef struct dsm_segment dsm_segment;
 extern void dsm_postmaster_startup(void);
 
 /* Functions that create, update, or remove mappings. */
-extern dsm_segment *dsm_create(uint64 size);
+extern dsm_segment *dsm_create(Size size);
 extern dsm_segment *dsm_attach(dsm_handle h);
-extern void *dsm_resize(dsm_segment *seg, uint64 size);
+extern void *dsm_resize(dsm_segment *seg, Size size);
 extern void *dsm_remap(dsm_segment *seg);
 extern void dsm_detach(dsm_segment *seg);
 
@@ -33,7 +33,7 @@ extern dsm_segment *dsm_find_mapping(dsm_handle h);
 
 /* Informational functions. */
 extern void *dsm_segment_address(dsm_segment *seg);
-extern uint64 dsm_segment_map_length(dsm_segment *seg);
+extern Size dsm_segment_map_length(dsm_segment *seg);
 extern dsm_handle dsm_segment_handle(dsm_segment *seg);
 
 #endif   /* DSM_H */

src/include/storage/dsm_impl.h

@@ -65,8 +65,8 @@ typedef enum
 } dsm_op;
 
 /* Create, attach to, detach from, resize, or destroy a segment. */
-extern bool dsm_impl_op(dsm_op op, dsm_handle handle, uint64 request_size,
-			void **impl_private, void **mapped_address, uint64 *mapped_size,
+extern bool dsm_impl_op(dsm_op op, dsm_handle handle, Size request_size,
+			void **impl_private, void **mapped_address, Size *mapped_size,
 			int elevel);
 
 /* Some implementations cannot resize segments.  Can this one? */