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commit    0e3ad4b96aedee57fc2694e28486fe0ceca8110a
Author:   Michael Paquier <michael@paquier.xyz>
Date:     Tue Dec 30 05:13:40 2025 +0000

    Add MultiXactOffsetStorageSize() to multixact_internal.h
    
    This function calculates in bytes the storage taken between two
    multixact offsets.  This will be used in an upcoming patch, introduced
    separately here as this piece can be useful on its own.
    
    Author: Naga Appani <nagnrik@gmail.com>
    Co-authored-by: Michael Paquier <michael@paquier.xyz>
    Discussion: https://postgr.es/m/aUyTvZMq2CLgNEB4@paquier.xyz


 src/include/access/multixact_internal.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/include/access/multixact_internal.h b/src/include/access/multixact_internal.h
index f2d6539e8a6..afe1f037610 100644
--- a/src/include/access/multixact_internal.h
+++ b/src/include/access/multixact_internal.h
@@ -121,4 +121,14 @@ MXOffsetToMemberOffset(MultiXactOffset offset)
 		member_in_group * sizeof(TransactionId);
 }
 
+/* Storage space consumed by a range of offsets, in bytes */
+static inline uint64
+MultiXactOffsetStorageSize(MultiXactOffset new_offset,
+						   MultiXactOffset old_offset)
+{
+	Assert(new_offset >= old_offset);
+	return (uint64) ((new_offset - old_offset) / MULTIXACT_MEMBERS_PER_MEMBERGROUP) *
+		MULTIXACT_MEMBERGROUP_SIZE;
+}
+
 #endif							/* MULTIXACT_INTERNAL_H */


[parent: 9cf746a453c1]