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Commit08fdfe7

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Fix mdtruncate() to close fd.c handle of deleted segments.
mdtruncate() forgot to FileClose() a segment's mdfd_vfd, when deletingit. That lead to a fd.c handle to a truncated file being kept open untilbackend exit.The issue appears to have been introduced way back in1a5c450,before that the handle was closed inside FileUnlink().The impact of this bug is limited - only VACUUM and ON COMMIT TRUNCATEfor temporary tables, truncate files in place (i.e. TRUNCATE itself isnot affected), and the relation has to be bigger than 1GB. Theconsequences of a leaked fd.c handle aren't severe either.Discussion: <20160908220748.oqh37ukwqqncbl3n@alap3.anarazel.de>Backpatch: all supported releases
1 parent0499bd2 commit08fdfe7

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  • src/backend/storage/smgr

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‎src/backend/storage/smgr/md.c

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Original file line numberDiff line numberDiff line change
@@ -868,6 +868,7 @@ mdtruncate(SMgrRelation reln, ForkNumber forknum, BlockNumber nblocks)
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v=v->mdfd_chain;
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Assert(ov!=reln->md_fd[forknum]);/* we never drop the 1st
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* segment */
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FileClose(ov->mdfd_vfd);
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pfree(ov);
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}
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elseif (priorblocks+ ((BlockNumber)RELSEG_SIZE)>nblocks)

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