Benjamin Coddington bff8460376 nfs/blocklayout: Limit repeat device registration on failure ...

[ Upstream commit 614733f944 ]

Every pNFS SCSI IO wants to do LAYOUTGET, then within the layout find the
device which can drive GETDEVINFO, then finally may need to prep the device
with a reservation.  This slow work makes a mess of IO latencies if one of
the later steps is going to fail for awhile.

If we're unable to register a SCSI device, ensure we mark the device as
unavailable so that it will timeout and be re-added via GETDEVINFO.  This
avoids repeated doomed attempts to register a device in the IO path.

Add some clarifying comments as well.

Fixes: d869da91cc ("nfs/blocklayout: Fix premature PR key unregistration")
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2024-12-05 14:03:09 +01:00

..

blocklayout.c

nfs/blocklayout: Limit repeat device registration on failure

2024-12-05 14:03:09 +01:00

blocklayout.h

nfs/blocklayout: Fix premature PR key unregistration

2024-07-08 13:47:27 -04:00

dev.c

nfs/blocklayout: Don't attempt unregister for invalid block device

2024-12-05 14:03:09 +01:00

extent_tree.c

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Makefile

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rpc_pipefs.c

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