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  • Committer: Sergei Golubchik
  • Date: 2014-06-02 21:25:54 UTC
  • Revision ID: sergii@pisem.net-20140602212554-j41oo0cyjr3xiuei
percona-server-5.5.37-35.0.tar.gz

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row/row0upd.c
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/*****************************************************************************
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Copyright (c) 1996, 2013, Oracle and/or its affiliates. All Rights Reserved.
 
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Copyright (c) 1996, 2014, Oracle and/or its affiliates. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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                data += len - BTR_EXTERN_FIELD_REF_SIZE;
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                /* The pointer must not be zero. */
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                ut_a(memcmp(data, field_ref_zero, BTR_EXTERN_FIELD_REF_SIZE));
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                /* The BLOB must be owned. */
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                ut_a(!(data[BTR_EXTERN_LEN] & BTR_EXTERN_OWNER_FLAG));
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                data[BTR_EXTERN_LEN] &= ~BTR_EXTERN_OWNER_FLAG;
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                data[BTR_EXTERN_LEN] |= BTR_EXTERN_INHERITED_FLAG;
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                /* The BTR_EXTERN_INHERITED_FLAG only matters in
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                rollback. Purge will always free the extern fields of
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                                rec, offsets, entry, node->update);
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                        if (change_ownership) {
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                                btr_pcur_store_position(pcur, mtr);
 
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                                /* The blobs are disowned here, expecting the
 
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                                insert down below to inherit them.  But if the
 
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                                insert fails, then this disown will be undone
 
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                                when the operation is rolled back. */
 
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                                btr_cur_disown_inherited_fields(
 
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                                        btr_cur_get_page_zip(btr_cur),
 
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                                        rec, index, offsets, node->update, mtr);
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                        }
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                }
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                ? UPD_NODE_INSERT_BLOB
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                : UPD_NODE_INSERT_CLUSTERED;
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        if (err == DB_SUCCESS && change_ownership) {
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                /* Mark the non-updated fields disowned by the old record. */
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                /* NOTE: this transaction has an x-lock on the record
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                and therefore other transactions cannot modify the
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                record when we have no latch on the page. In addition,
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                we assume that other query threads of the same
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                transaction do not modify the record in the meantime.
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                Therefore we can assert that the restoration of the
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                cursor succeeds. */
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                mtr_start(mtr);
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                if (!btr_pcur_restore_position(BTR_MODIFY_LEAF, pcur, mtr)) {
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                        ut_error;
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                }
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                rec = btr_cur_get_rec(btr_cur);
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                offsets = rec_get_offsets(rec, index, offsets,
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                                          ULINT_UNDEFINED, &heap);
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                ut_ad(page_rec_is_user_rec(rec));
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                btr_cur_disown_inherited_fields(
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                        btr_cur_get_page_zip(btr_cur),
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                        rec, index, offsets, node->update, mtr);
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                mtr_commit(mtr);
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        }
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        mem_heap_free(heap);
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        return(err);