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Heimdal will, on supporting systems, set these flags in the type
argument of socket(), causing breakage when combined with
socket_wrapper.
For background on these flags, see http://lwn.net/Articles/281965/
Andrew Bartlett
This function searches for a single record using a given filter,
adding the extended-dn control so that any returned DNs will have the
GUID and SID fields returned. This will be used in the sam auth code
to prevent us doing a member= search for the groups, which invokes an
unindexed search.
This greatly reduces the fragmentation of databases where records
tend to grow slowly by a small amount each time. The case where this
is most seen is the ldb index records. Adding this overallocation
reduced the size of the resulting database by more than 20x when
running a test that adds 10k users.
The idea behind this is to recover from badly fragmented free
lists. Choosing the point where the file expands is fairly arbitrary,
but seems to work well.
During a transaction commit tdb normally uses fsync/msync calls to
make it crash safe. This can be disabled using the TDB_NOSYNC flag,
but it wasn't disabling all the code paths that caused a fsync/msync.
This is required because the deferred connect code skips the connect()
until sending the packet, but unless we catch this call, the connect()
never happens.
Andrew Bartlett
On my Linux box, this is definitely the more reliable strategy with unix domain
sockets, and according to my tests it also works correctly with TCP sockets.
A socket where the other side has closed only becomes readable. To catch
errors early when sitting in a pure writev, we need to also test for
readability.
