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| author |   Chuck Lever <chuck.lever@oracle.com> | 2016-11-07 16:16:24 -0500 |
|---|---|---|
| committer |   Anna Schumaker <Anna.Schumaker@Netapp.com> | 2016-11-10 11:04:54 -0500 |
| commit | 62bdf94a2049822ef8c6d4b0e83cd9c3a1663ab4 (patch) | |
| tree | 76dda0f9318f823055e402c288efd935559b8261 /fs | |
| parent | fs/nfs: Fix used uninitialized warn in nfs4_slot_seqid_in_use() (diff) | |
| download | linux-dev-62bdf94a2049822ef8c6d4b0e83cd9c3a1663ab4.tar.xz linux-dev-62bdf94a2049822ef8c6d4b0e83cd9c3a1663ab4.zip | |
xprtrdma: Fix DMAR failure in frwr_op_map() after reconnect
When a LOCALINV WR is flushed, the frmr is marked STALE, then
frwr_op_unmap_sync DMA-unmaps the frmr's SGL. These STALE frmrs
are then recovered when frwr_op_map hunts for an INVALID frmr to
use.
All other cases that need frmr recovery leave that SGL DMA-mapped.
The FRMR recovery path unconditionally DMA-unmaps the frmr's SGL.
To avoid DMA unmapping the SGL twice for flushed LOCAL_INV WRs,
alter the recovery logic (rather than the hot frwr_op_unmap_sync
path) to distinguish among these cases. This solution also takes
care of the case where multiple LOCAL_INV WRs are issued for the
same rpcrdma_req, some complete successfully, but some are flushed.
Reported-by: Vasco Steinmetz <linux@kyberraum.net>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Vasco Steinmetz <linux@kyberraum.net>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs')
0 files changed, 0 insertions, 0 deletions