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authorTrond Myklebust <trond.myklebust@primarydata.com>2015-11-02 09:59:00 -0500
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-11-02 13:50:37 -0500
commit260074cd8413489903d4484058e61649d6e08580 (patch)
treeaa4b89ce7367791def57c172ddeb5dcf5bbdec2b /net
parent135444126a1175912b43366f6109cb297018f034 (diff)
pNFS/flexfiles: Add support for FF_FLAGS_NO_IO_THRU_MDS
For loosely coupled pNFS/flexfiles systems, there is often no advantage at all in going through the MDS for I/O, since the MDS is subject to the same limitations as all other clients when talking to DSes. If a DS is unresponsive, I/O through the MDS will fail. For such systems, the only scalable solution is to have the pNFS clients retry doing pNFS, and so the protocol now provides a flag that allows the pNFS server to signal this. If LAYOUTGET returns FF_FLAGS_NO_IO_THRU_MDS, then we should assume that the MDS wants the client to retry using these devices, even if they were previously marked as being unavailable. To do so, we add a helper, ff_layout_mark_devices_valid() that will be called from layoutget. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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