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When a samba server process dies hard, it has no chance to clean up its entries
in locking.tdb, brlock.tdb, connections.tdb and sessionid.tdb.
For locking.tdb and brlock.tdb Samba is robust by checking every time we read
an entry from the database if the corresponding process still exists. If it
does not exist anymore, the entry is deleted. This is not 100% failsafe though:
On systems with a limited PID space there is a non-zero chance that between the
smbd's death and the fresh access, the PID is recycled by another long-running
process. This renders all files that had been locked by the killed smbd
potentially unusable until the new process also dies.
This patch is supposed to fix the problem the following way: Every process ID
in every database is augmented by a random 64-bit number that is stored in a
serverid.tdb. Whenever we need to check if a process still exists we know its
PID and the 64-bit number. We look up the PID in serverid.tdb and compare the
64-bit number. If it's the same, the process still is a valid smbd holding the
lock. If it is different, a new smbd has taken over.
I believe this is safe against an smbd that has died hard and the PID has been
taken over by a non-samba process. This process would not have registered
itself with a fresh 64-bit number in serverid.tdb, so the old one still exists
in serverid.tdb. We protect against this case by the parent smbd taking care of
deregistering PIDs from serverid.tdb and the fact that serverid.tdb is
CLEAR_IF_FIRST.
CLEAR_IF_FIRST does not work in a cluster, so the automatic cleanup does not
work when all smbds are restarted. For this, "net serverid wipe" has to be run
before smbd starts up. As a convenience, "net serverid wipedbs" also cleans up
sessionid.tdb and connections.tdb.
While there, this also cleans up overloading connections.tdb with all the
process entries just for messaging_send_all().
Volker
New net_registry_getsd_internal does the work(),
net_registry_getsd() just prints the result.
This in preparation to add support for other output formats
than the currently used display_sec_desc().
Michael
In a cluster, this makes a large difference: For r/w traverse, we have to do a
fetch_locked on every record which for most users of connections_forall is just
overkill.
This is the basis to implement global locks in ctdb without depending on a
shared file system. The initial goal is to make ctdb persistent transactions
deterministic without too many timeouts.
A combination patch from Johannes Poehlmann <johannes@lst.de> and
Jeremy. Fix the return codes from smb_download_file() and smb_download_dir().
Jeremy.
In order to add --use-ccache to net, I added another "bool opt_ccache;" to
struct net_context. popt did not like this, it took a while to figure out why.
Popt has the lines
/* XXX Check alignment, may fail on funky platforms. */
if (arg == NULL || (((unsigned long)arg) & (sizeof(*arg)-1)))
return POPT_ERROR_NULLARG;
The "bool opt_ccache;" was not aligned anymore...
If we put strings like "Usage:" into separate _() macros and not the whole
"Usage:..." string we can cover much more messages by only one single
translation. The drawback is that the message in the sources looks less pretty.
