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c3377cbfaa
Instead of issuing a separate isc_task_send() call for every RBTDB node
that triggers tree pruning, maintain a list of nodes from which tree
pruning can be started from and only issue an isc_task_send() call if
pruning has not yet been triggered by another RBTDB node.
The extra queuing overhead eliminated by this change could be remotely
exploited to cause excessive memory use.
As this change modifies struct dns_rbtnode by adding a new 'prunelink'
member to it, bump MAPAPI to prevent any attempts of loading map-format
zone files created using older BIND 9 versions.
(cherry picked from commit 24381cc36d)
16 lines
829 B
Text
16 lines
829 B
Text
# This value should be increased whenever changing the structure of
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# any object that will appear in a type 'map' master file (which
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# contains a working memory image of an RBT database), as loading
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# an incorrect memory image produces an inconsistent and probably
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# nonfunctional database. These structures include but are not
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# necessarily limited to dns_masterrawheader, rbtdb_file_header,
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# rbt_file_header, dns_rbtdb, dns_rbt, dns_rbtnode, rdatasetheader.
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#
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# Err on the side of caution: if anything in the RBTDB is changed,
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# bump the value. Making map files unreadable protects the system
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# from instability; it's a feature not a bug.
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#
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# Whenever releasing a new major release of BIND9, set this value
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# back to 1.0 when releasing the first alpha. Map files are *never*
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# compatible across major releases.
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MAPAPI=4.0
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