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nfs41: introduce NFS_LAYOUT_RETURN_BEFORE_CLOSE

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When it is set, generic pnfs would try to send layoutreturn right
before last close/delegation_return regard less NFS_LAYOUT_ROC is
set or not. LD can then make sure layoutreturn is always sent
rather than being omitted.

The difference against NFS_LAYOUT_RETURN is that
NFS_LAYOUT_RETURN_BEFORE_CLOSE does not block usage of the layout so
LD can set it and expect generic layer to try pnfs path at the
same time.

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Tom Haynes <loghyr@primarydata.com>
This commit is contained in:
Peng Tao 2014-11-17 09:30:41 +08:00 • committed by Tom Haynes
parent 6c16605d6e
commit 193e3aa2cc
3 changed files with 36 additions and 7 deletions
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2
fs/nfs/nfs4proc.c
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@ -7797,6 +7797,8 @@ static void nfs4_layoutreturn_release(void *calldata)
if (lrp->res.lrs_present)
pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
clear_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, &lo->plh_flags);
rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
lo->plh_block_lgets--;
spin_unlock(&lo->plh_inode->i_lock);
pnfs_put_layout_hdr(lrp->args.layout);