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pnfs: layout roc code

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A layout can request return-on-close.  How this interacts with the
forgetful model of never sending LAYOUTRETURNS is a bit ambiguous.
We forget any layouts marked roc, and wait for them to be completely
forgotten before continuing with the close.  In addition, to compensate
for races with any inflight LAYOUTGETs, and the fact that we do not get
any layout stateid back from the server, we set the barrier to the worst
case scenario of current_seqid + number of outstanding LAYOUTGETS.

Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Fred Isaman 2011-01-06 11:36:32 +00:00 • committed by Trond Myklebust
commit f7e8917a67
7 changed files with 152 additions and 6 deletions
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1
include/linux/nfs_fs_sb.h
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@ -149,6 +149,7 @@ struct nfs_server {
that are supported on this
filesystem */
struct pnfs_layoutdriver_type *pnfs_curr_ld; /* Active layout driver */
struct rpc_wait_queue roc_rpcwaitq;
#endif
void (*destroy)(struct nfs_server *);