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Commit42279b2

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Use 0-based numbering in comments about backup blocks.
The macros and functions that work with backup blocks in the redo functionuse 0-based numbering, so let's use that consistently in the function thatgenerates the records too. Makes it so much easier to compare thegeneration and replay functions.Backpatch to 9.0, where we switched from 1-based to 0-based numbering.
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‎src/backend/access/nbtree/nbtinsert.c

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -1210,7 +1210,7 @@ _bt_split(Relation rel, Buffer buf, OffsetNumber firstright,
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item= (IndexTuple)PageGetItem(origpage,itemid);
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lastrdata->data= (char*)item;
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lastrdata->len=MAXALIGN(IndexTupleSize(item));
1213-
lastrdata->buffer=buf;/* backup block1 */
1213+
lastrdata->buffer=buf;/* backup block0 */
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lastrdata->buffer_std= true;
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}
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@@ -1237,7 +1237,7 @@ _bt_split(Relation rel, Buffer buf, OffsetNumber firstright,
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lastrdata->data= (char*)newitem;
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lastrdata->len=MAXALIGN(newitemsz);
1240-
lastrdata->buffer=buf;/* backup block1 */
1240+
lastrdata->buffer=buf;/* backup block0 */
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lastrdata->buffer_std= true;
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}
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elseif (ropaque->btpo.level==0)
@@ -1246,14 +1246,14 @@ _bt_split(Relation rel, Buffer buf, OffsetNumber firstright,
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* Although we don't need to WAL-log the new item, we still need
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* XLogInsert to consider storing a full-page image of the left
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* page, so make an empty entry referencing that buffer. This also
1249-
* ensures that the left page is always backup block1.
1249+
* ensures that the left page is always backup block0.
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*/
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lastrdata->next=lastrdata+1;
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lastrdata++;
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lastrdata->data=NULL;
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lastrdata->len=0;
1256-
lastrdata->buffer=buf;/* backup block1 */
1256+
lastrdata->buffer=buf;/* backup block0 */
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lastrdata->buffer_std= true;
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}
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@@ -1286,7 +1286,7 @@ _bt_split(Relation rel, Buffer buf, OffsetNumber firstright,
12861286

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lastrdata->data=NULL;
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lastrdata->len=0;
1289-
lastrdata->buffer=sbuf;/* backup block2 */
1289+
lastrdata->buffer=sbuf;/* backup block1 */
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lastrdata->buffer_std= true;
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}
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