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doc: Correct description of values used in FSM for indexes
author Michael Paquier <michael@paquier.xyz>
2025年3月27日 01:20:41 +0000 (10:20 +0900)
committer Michael Paquier <michael@paquier.xyz>
2025年3月27日 01:20:41 +0000 (10:20 +0900)
The implementation of FSM for indexes is simpler than heap, where 0 is
used to track if a page is in-use and (BLCKSZ - 1) if a page is free.
One comment in indexfsm.c and one description in the documentation of
pg_freespacemap were incorrect about that.

Author: Alex Friedman <alexf01@gmail.com>
Discussion: https://postgr.es/m/71eef655-c192-453f-ac45-2772fec2cb04@gmail.com
Backpatch-through: 13

doc/src/sgml/pgfreespacemap.sgml patch | blob | blame | history
src/backend/storage/freespace/indexfsm.c patch | blob | blame | history

diff --git a/doc/src/sgml/pgfreespacemap.sgml b/doc/src/sgml/pgfreespacemap.sgml
index 829ad60f32fdc7b124439263566fa73406114159..3774a9f8c6b29eea7d6c1598b9ac6fce272d87de 100644 (file)
--- a/doc/src/sgml/pgfreespacemap.sgml
+++ b/doc/src/sgml/pgfreespacemap.sgml
@@ -67,7 +67,7 @@
<para>
For indexes, what is tracked is entirely-unused pages, rather than free
space within pages. Therefore, the values are not meaningful, just
- whether a page is full or empty.
+ whether a page is in-use or empty.
</para>
</sect2>
diff --git a/src/backend/storage/freespace/indexfsm.c b/src/backend/storage/freespace/indexfsm.c
index 1fc263892a7f33018f92230fc23bb4ecedd2bdf4..614261e4e22fc8ff3624ba3966590db98449fef8 100644 (file)
--- a/src/backend/storage/freespace/indexfsm.c
+++ b/src/backend/storage/freespace/indexfsm.c
@@ -16,7 +16,7 @@
* This is similar to the FSM used for heap, in freespace.c, but instead
* of tracking the amount of free space on pages, we only track whether
* pages are completely free or in-use. We use the same FSM implementation
- * as for heaps, using BLCKSZ - 1 to denote used pages, and 0 for unused.
+ * as for heaps, using 0 to denote used pages, and (BLCKSZ - 1) for unused.
*
*-------------------------------------------------------------------------
*/
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