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Commit964ec46

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Fix aboriginal bug in BufFileDumpBuffer that would cause it to write the
wrong data when dumping a bufferload that crosses a component-file boundary.This probably has not been seen in the wild because (a) component files arenormally 1GB apiece and (b) non-block-aligned buffer usage is relativelyrare. But it's fairly easy to reproduce a problem if one reduces RELSEG_SIZEin a test build. Kudos to Kurt Harriman for spotting the bug.
1 parentf086be3 commit964ec46

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‎src/backend/storage/file/buffile.c

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/storage/file/buffile.c,v 1.25 2007/01/05 22:19:37 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/storage/file/buffile.c,v 1.26 2007/06/01 23:43:11 tgl Exp $
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*
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* NOTES:
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*
@@ -289,7 +289,7 @@ BufFileDumpBuffer(BufFile *file)
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return;/* seek failed, give up */
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file->offsets[file->curFile]=file->curOffset;
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}
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bytestowrite=FileWrite(thisfile,file->buffer,bytestowrite);
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bytestowrite=FileWrite(thisfile,file->buffer+wpos,bytestowrite);
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if (bytestowrite <=0)
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return;/* failed to write */
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file->offsets[file->curFile]+=bytestowrite;

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