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Commit3b279d8

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Improve comments in slru.{c,h} about segment name format
slru.h described incorrectly how SLRU segment names are formatteddepending on the segment number and if long or short segment names areused. This commit closes the gap with a better description, fittingwith the reality.Reported-by: Noah MischAuthor: Aleksander AlekseevDiscussion:https://postgr.es/m/20240626002747.dc.nmisch@google.comBackpatch-through: 17
1 parentdb46016 commit3b279d8

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‎src/backend/access/transam/slru.c

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@@ -72,6 +72,21 @@
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#include"storage/shmem.h"
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#include"utils/guc_hooks.h"
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/*
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* Converts segment number to the filename of the segment.
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*
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* "path" should point to a buffer at least MAXPGPATH characters long.
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*
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* If ctl->long_segment_names is true, segno can be in the range [0, 2^60-1].
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* The resulting file name is made of 15 characters, e.g. dir/123456789ABCDEF.
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*
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* If ctl->long_segment_names is false, segno can be in the range [0, 2^24-1].
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* The resulting file name is made of 4 to 6 characters, as of:
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*
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* dir/1234 for [0, 2^16-1]
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* dir/12345 for [2^16, 2^20-1]
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* dir/123456 for [2^20, 2^24-1]
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*/
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staticinlineint
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SlruFileName(SlruCtlctl,char*path,int64segno)
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{

‎src/include/access/slru.h

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@@ -134,10 +134,9 @@ typedef struct SlruCtlData
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bits16bank_mask;
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/*
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* If true, use long segment filenames formed from lower 48 bits of the
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* segment number, e.g. pg_xact/000000001234. Otherwise, use short
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* filenames formed from lower 16 bits of the segment number e.g.
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* pg_xact/1234.
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* If true, use long segment file names. Otherwise, use short file names.
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*
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* For details about the file name format, see SlruFileName().
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*/
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boollong_segment_names;
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