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Viewing changes to src/backend/commands/sequence.c

  • Committer: Bazaar Package Importer
  • Author(s): Martin Pitt
  • Date: 2011-06-14 09:53:29 UTC
  • mfrom: (1.1.1 upstream)
  • Revision ID: james.westby@ubuntu.com-20110614095329-kerawur7tb6p8s71
Tags: 9.1~beta2-1
* New upstream beta release.
* Drop 03-cmsgcred-size.patch, fixed upstream.
* debian/postgresql-9.1.install: Install new pg_basebackup translations.
* debian/control: Fix the server-dev dependency to p-common to also work for
  backports.
* debian/watch: Fix for beta versions.
* debian/copyright: Add pointers to GPL and Artistic licenses for the Perl
  terms.
* debian/postgresql-9.1.preinst: Fail the package upgrade early when
  upgrading from beta-1, as the DB format changed.

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src/backend/commands/sequence.c
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        Assert(ItemIdIsNormal(lp));
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        tuple.t_data = (HeapTupleHeader) PageGetItem(page, lp);
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        /*
 
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         * Previous releases of Postgres neglected to prevent SELECT FOR UPDATE on
 
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         * a sequence, which would leave a non-frozen XID in the sequence tuple's
 
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         * xmax, which eventually leads to clog access failures or worse. If we
 
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         * see this has happened, clean up after it.  We treat this like a hint
 
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         * bit update, ie, don't bother to WAL-log it, since we can certainly do
 
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         * this again if the update gets lost.
 
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         */
 
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        if (HeapTupleHeaderGetXmax(tuple.t_data) != InvalidTransactionId)
 
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        {
 
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                HeapTupleHeaderSetXmax(tuple.t_data, InvalidTransactionId);
 
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                tuple.t_data->t_infomask &= ~HEAP_XMAX_COMMITTED;
 
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                tuple.t_data->t_infomask |= HEAP_XMAX_INVALID;
 
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                SetBufferCommitInfoNeedsSave(*buf);
 
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        }
 
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        seq = (Form_pg_sequence) GETSTRUCT(&tuple);
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        /* this is a handy place to update our copy of the increment */