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This implements the ReadOnly and ReadWrite request processing, delegation and revoking of delegations for all requests coming in across the network from a remote node.
(This used to be ctdb commit 78f2c2ea70e6270cec59db7c3f174a511bf608a9)
This triggers a child process to be created to perform the actual potentially blocking calls that are required.
(This used to be ctdb commit 7d575ee92c95bc4aab78a33bc1aac7ff0811ab3a)
Once the contexts are freed, the deferred calls are re-issued to the input packet processing functions again.
This is needed when/if a CALL can not currently be processed by the main engine due to the record being locked down for revoking of all delegations.
The data is passed through several layers of callbacks, and finally a timed event callback to ensure that the processing of the packet will be restarted again at the topmost eventloop, avoinding event loop nesting.
(This used to be ctdb commit cc6f78efcfa3b8caeffbd68018e6dfbf81488dce)
Assume all databases will support readonly mode for now and se thte flag for all databases. At later stage we will add support to control on a per database level whether delegations will be supported or not.
(This used to be ctdb commit 502f86f79944df4bac9094f716e54110c511dc24)
The API for this function has changed since the 1.2 branch where readonly locks are being merged from
(This used to be ctdb commit d01b9716d3e50f4c6d102e8411f0401b0f499699)
Since some record flags may differ between nodes in the cluster when read only delegations are in use, cattdb is needed when you need to know the exact flag settings on the current node itself.
(This used to be ctdb commit d2342b680a3a8160d903d12550b86ee21c8b277d)
This function differs from the old FETCH in that this function will also fetch the record header and not just the record data
(This used to be ctdb commit c7196d16e8e03bb2a64be164d15a7502300eae0e)
No code change, this is for easier reading the sequence of what happens
Signed-off-by: Michael Adam <obnox@samba.org>
(This used to be ctdb commit 883b9b185dce03a6bf233fbf2cfabad9883519e5)
No code change, this is for better readability
Signed-off-by: Michael Adam <obnox@samba.org>
(This used to be ctdb commit e0f93459e05eef33024096654b4aaf1eb3c6d7c4)
We need that to have the "offsetof" macro, thus we don't need to redeclare it
in libctdb_private.h
Signed-off-by: Michael Adam <obnox@samba.org>
(This used to be ctdb commit 4bfdfdae4f8ab23f14bc6ab4c06b66c07714ec17)
New function ctdb_check_tcp_ports_ctdb(). This should be fast... and
is now the default checker. If it fails in an unexpected way we fall
back to the nmap and netstat checkers.
Signed-off-by: Martin Schwenke <martin@meltin.net>
(This used to be ctdb commit a1e16a707ce204817531a61455000361f972080a)
Split the netstat-specific parts of ctdb_check_tcp_ports() into new
function ctdb_check_tcp_ports_netstat().
Implement new ctdb_check_tcp_ports_nmap() function that uses
"nmap -PS" to check if the desired ports are listening.
ctdb_check_ctdb_ports() now uses new configuration variable
CTDB_TCP_PORT_CHECKERS to decide which port checkers to try. Default
value is currently "nmap netstat". If nmap is not found then this
will fall back to netstat - if logging is at debug level this will
also fill the logs with message saying the nmap checker failed. This
indicates that either nmap should be installed or the default value of
CTDB_TCP_PORT_CHECKERS should be changed (in a configuration file) to
avoid trying to use nmap.
Signed-off-by: Martin Schwenke <martin@meltin.net>
(This used to be ctdb commit d9651175b40b9454e7d4e98291955fcf1445085e)
Use the new debug function to conditionally print the netstat output.
Signed-off-by: Martin Schwenke <martin@meltin.net>
(This used to be ctdb commit 44c14aeeb11080980fe07c7396d06843a4870747)
Sometimes smbd and other services can take a while to start,
especially when there is a lot of activity after ctdbd has just
started. The TCP port check can then pollute the logs with lots of
"ERROR" messages and possibly extra debug.
This creates a flag file when a service is started (but not restarted)
and this flag is removed the first time that TCP port checks succeed
for that service. When a port check fails and the flag file still
exists, a less extreme "INFO" message is printed rather than the usual
"ERROR" message. This means that until the node actually becomes
healthy we see more friendly messages.
The subtext is that we're hearing false positive reports "recreates"
of CQ S1024874 (samba stopped responding on port 445) quite often when
ctdbd is started. This reduces the chances of people reporting such
false recreates...
Signed-off-by: Martin Schwenke <martin@meltin.net>
(This used to be ctdb commit 571865eb6ef847857129d0b1e2ba5fa7254bfe8c)
ctdb_check_tcp_ports() runs "netstat -a -t -n" in a loop for each
port. There are 2 problems with this:
* Netstat is run on each loop iteration when it need only be run once.
* The -a option is used to list all connections but the function only
cares about the listening ports. There may be many thousands of
non-listening ports to grep through.
This changes ctdb_check_tcp_ports() to run netstat with the -l option
instead of the -a option. It also only runs netstat once before the
main loop.
When a port is found to not be listening the output of the netstat
command is now dumped to help with debugging.
Signed-off-by: Martin Schwenke <martin@meltin.net>
(This used to be ctdb commit 830355a8b18c53cfcc3ad1e3009bbb1a7a681fa0)
The debug function passes its arguments to echo if
$CTDB_CURRENT_DEBUGLEVEL is >= 4 (i.e. DEBUG). If no args are given
then use stdin - this allows the function to be used with here
documents.
To ensure $CTDB_CURRENT_DEBUGLEVEL is set,
ctdb_set_current_debuglevel() is called near the end of the functions
file.
Signed-off-by: Martin Schwenke <martin@meltin.net>
(This used to be ctdb commit 6143483d9f87322578c00f12081e381f425226ca)
that tries to bind to the specified port on INADDR_ANY.
This can be used for testing if a service is listening to that port or not.
Errors are printed to stdout and the returned status code is either 0 : if we managed to bind to the port (in which case the service is NOT listening on that bort) or the value of errno that stopped us from binding to a port.
errno for EADDRINUSE is 98 so a script using this command should check the status code against the value 98.
If this command returns 98 it means the service is listening to the specified port.
(This used to be ctdb commit 04cbb490c5a075080923fde58af7082572c55c43)
This function ensures that CTDB_CURRENT_DEBUGLEVEL is set. It works
like this:
1. If it is already set then do nothing, since it might have been set
some other way.
The recommended "other way" would be to add a file in rc.local.d/.
2. If it is not set then set it by sourcing
/var/ctdb/eventscript_debuglevel.
3. If this file does not exist then create it using output from "ctdb
getdebug".
If the optional 1st argument is set to "create" then don't source an
existing file but create a new one instead - this is useful for
creating the file just once in each event run in, say, 00.ctdb.
If there's a problem getting the debug level from ctdb then it is
silently set to 0 - no use spamming logs if our debug code is
broken...
Signed-off-by: Martin Schwenke <martin@meltin.net>
(This used to be ctdb commit 93910921c8a25f2b029733cd938069ff7c7bdab7)
