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Commit87f9982

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Fix failure to mark init buffers as BM_PERMANENT.
This could result in corruption of the init fork of an unlogged indexif the ambuildempty routine for that index used shared buffers tocreate the init fork, which was true for brin, gin, gist, and hashindexes.Patch by me, based on an earlier patch by Michael Paquier, who alsoreviewed this one. This also incorporates an idea from ArturZakirov.Discussion:http://postgr.es/m/CACYUyc8yccE4xfxhqxfh_Mh38j7dRFuxfaK1p6dSNAEUakxUyQ@mail.gmail.com
1 parent37289ff commit87f9982

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2 files changed

+8
-3
lines changed

2 files changed

+8
-3
lines changed

‎src/backend/storage/buffer/bufmgr.c

Lines changed: 6 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1292,12 +1292,17 @@ BufferAlloc(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
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* paranoia. We also reset the usage_count since any recency of use of
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* the old content is no longer relevant. (The usage_count starts out at
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* 1 so that the buffer can survive one clock-sweep pass.)
1295+
*
1296+
* Make sure BM_PERMANENT is set for buffers that must be written at every
1297+
* checkpoint. Unlogged buffers only need to be written at shutdown
1298+
* checkpoints, except for their "init" forks, which need to be treated
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* just like permanent relations.
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*/
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buf->tag=newTag;
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buf_state &= ~(BM_VALID |BM_DIRTY |BM_JUST_DIRTIED |
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BM_CHECKPOINT_NEEDED |BM_IO_ERROR |BM_PERMANENT |
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BUF_USAGECOUNT_MASK);
1300-
if (relpersistence==RELPERSISTENCE_PERMANENT)
1305+
if (relpersistence==RELPERSISTENCE_PERMANENT||forkNum==INIT_FORKNUM)
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buf_state |=BM_TAG_VALID |BM_PERMANENT |BUF_USAGECOUNT_ONE;
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else
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buf_state |=BM_TAG_VALID |BUF_USAGECOUNT_ONE;

‎src/include/storage/buf_internals.h

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -64,8 +64,8 @@
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#defineBM_JUST_DIRTIED(1U << 28)/* dirtied since write started */
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#defineBM_PIN_COUNT_WAITER(1U << 29)/* have waiter for sole pin */
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#defineBM_CHECKPOINT_NEEDED(1U << 30)/* must write for checkpoint */
67-
#defineBM_PERMANENT(1U << 31)/* permanentrelation (not
68-
* unlogged) */
67+
#defineBM_PERMANENT(1U << 31)/* permanentbuffer (not
68+
* unlogged, or init fork) */
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/*
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* The maximum allowed value of usage_count represents a tradeoff between
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* accuracy and speed of the clock-sweep buffer management algorithm. A

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