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Make xenstored use tdb, transactions can soft-fail (EAGAIN) Transactions no longer take root dir, no longer lock & block: commit can fail spuriously with EAGAIN, not ETIMEDOUT. Speeds up transactions by over 1000 times, should be NFS safe. New program: xs_tdb_dump to dump raw TDB contents. Don't do failure testing: we are no longer robust against all ENOMEM 8( Introduce "struct node" which contains perms, children and data. Make struct xs_permissions unpadded, so we can write to tdb w/o valgrind complaints. Gently modify TDB to use talloc, not do alloc on tdb_delete. Fix up transaction users for new semantics. Don't need a transaction around a single read in xen/i386/kernel/smpboot.c. Python: transaction_start() returns True/False rather than raising exception on EAGAIN. Fix usage comment on xs_transaction_end(). Include stdarg to xs_tdb_dump so it compiles. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>