Before b152d26 it was possible to set iscsi->reconnect_max_retries to 0.
This allowed reconnects, but aborted as soon as the reconnect failed.
The same behaviour is currenltly only possible by setting iscsi->reconnect_max_retries
to 1. iscsi->reconnect_max_retries == 0 forbids reconnecting completly.
Signed-off-by: Peter Lieven <pl@kamp.de>
iscsi_realloc MUST NOT be called with a pointer that is in the freelist
of small allocations. First they are free and secondly a realloc
will change the size of the small allocation to an unknown size.
This reverts commit d8de6531f8.
Disable memory caching in libiscsi if the environment variable
LIBISCSI_CACHE_ALLOCATIONS has been set to zero. This makes
Valgrind reports more meaningful.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
This patch improves the stability of libiscsi by avoiding that
stale pointers are passed to free().
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
the check was not quite correct. iscsi->pending_reconnect can be true but
we are still connected (and thus can disconnect). This is the case when
we receive an async logout request.
Signed-off-by: Peter Lieven <pl@kamp.de>
if reconnect is disabled then a failure in iscsi_service_reconnect_if_loggedin
can leak back to the application by iscsi_service returning an error
but the error string is not being updated.
Thus the applucation will print the last prevous error message that was set.
Change iscsi_service_reconnect_if_loggedin to print a less confusing
error message.
Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
If we are reconnecting and the connection is already established we
end up looping forever if there is a socket error before we finish
the login process. Fix this by invoking the reconnect callback if
there is an error and no new reconnect is scheduled.
Signed-off-by: Peter Lieven <pl@kamp.de>
those are part of the login process to consume UNIT_ATTENTIONS.
Its questionable if we should consume them at all, but iff we change
that behaviour we should do it for the initial login as well as
for a reconnect.
Signed-off-by: Peter Lieven <pl@kamp.de>
Just ignore any iSCSI AsyncMsg / SCSI Async Events we receive instead of
reconnecting. We can't pass the data back to the application anyway
with the current API.
Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
this is meant as a hint that there can be no event at the moment
and in this special case iscsi_service will return immediately.
We use this at the moment in the case of a wait for a reconnect
in which case we would enter a busy loop waiting for that
reconnect. The 0 means do not poll for the client application.
Do not poll, just wait a little (a few hundred ms) and call iscsi_which_events
again. The wait should be timer driven or at least non busy looping,
of course.
Signed-off-by: Peter Lieven <pl@kamp.de>
RFC3720 10.13.4. states that the statsn should explicitly set with
the first Login Repsonse. In theory the target could choose a StatSN
that is not greater than iscsi->statsn (zero at start) in Serial32
arithmetic.
Signed-off-by: Peter Lieven <pl@kamp.de>
RFC3720 10.19. NOP-In
NOP-In is either sent by a target as a response to a NOP-Out, as a
"ping" to an initiator, or as a means to carry a changed ExpCmdSN
and/or MaxCmdSN if another PDU will not be available for a long time
(as determined by the target).
...
Signed-off-by: Peter Lieven <pl@kamp.de>
originally NOPs where used to detect failures in the transport
layer. This is e.g. implemented in qemu since a few years now.
Recently I found a few vServers with hanging I/O where
the NOP mechanism could not detect the error.
The reason is most likely due to a bug in the target,
however if NOPs increase the CmdSN this could help
to detect such failures. If there are requests hanging
and the OS stops I/O before CmdSN > MaxCmdSN we can currently
send NOPs forever and they might still be answered. If
a NOP increases the CmdSN we will enter a point where CmdSN
is greater than MaxCmdSN. This is, of course, not the ideal check,
but it might detect some types of errors. Ideally we would
send out a Test-Unit-Ready command with attr=ordered, but
that requires a new API and/or modification of the tool
that uses libiscsi. This here comes with no modification for
the userspace.
Signed-off-by: Peter Lieven <pl@kamp.de>
iscsi-ls show luns command does not work when the target redirects at login.
to avoid redundant code allow iscsi_full_connect_async to skip the testunit ready
part.
Signed-off-by: Peter Lieven <pl@kamp.de>
We allowed iscsi to be NULL in iscsi_parse_url. Especially
qemu does this and currently segfaults at start. Change the
usage guidelines for target username/password to be the same
as for chap username/password.
Signed-off-by: Peter Lieven <pl@kamp.de>
