diff options
| author | Bart Van Assche <bvanassche@acm.org> | 2013-02-21 17:20:00 +0000 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2013-02-25 09:31:14 -0800 |
| commit | 2ce19e72f4d570c87e025ee6fca4eae699a8b712 (patch) | |
| tree | f9055b2a0390954b222450ea93dffdab0316c674 /drivers/infiniband/ulp/srp/ib_srp.h | |
| parent | c7c4e7ff8047e43c45628b85ac200582e9404c39 (diff) | |
IB/srp: Fail I/O requests if the transport is offline
If an SRP target is no longer reachable and srp_reset_host() fails to
reconnect then ib_srp will invoke scsi_remove_host(). That function
will invoke __scsi_remove_device() for each LUN. And that last
function will change the device state from SDEV_TRANSPORT_OFFLINE into
SDEV_CANCEL. Certain user space software, e.g. older versions of
multipathd, continue queueing I/O to SCSI devices that are in the
SDEV_CANCEL state.
If these I/O requests are submitted as SG_IO that means that the
REQ_PREEMPT flag will be set and hence that these requests will be
passed to srp_queuecommand(). These requests will time out. If new
requests are queued fast enough from user space these active requests
will prevent __scsi_remove_device() to finish.
Avoid this by failing I/O requests in the SDEV_CANCEL state if the
transport is offline. Introduce a new variable to keep track of the
transport state instead of failing requests if (!target->connected ||
target->qp_in_error), so that the SCSI error handler has a chance to
retry commands after a transport layer failure occurred.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Cc: <stable@vger.kernel.org> # 3.8
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/ulp/srp/ib_srp.h')
| -rw-r--r-- | drivers/infiniband/ulp/srp/ib_srp.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h index de2d0b3c0bfe..66fbedda4571 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.h +++ b/drivers/infiniband/ulp/srp/ib_srp.h @@ -140,6 +140,7 @@ struct srp_target_port { unsigned int cmd_sg_cnt; unsigned int indirect_size; bool allow_ext_sg; + bool transport_offline; /* Everything above this point is used in the hot path of * command processing. Try to keep them packed into cachelines. |