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| author | Peng Tao | 2014-08-22 11:37:41 +0200 |
|---|---|---|
| committer | Tom Haynes | 2015-02-03 20:06:39 +0100 |
| commit | 9bf87482ddc6f8db884177a2a16b1a1dc12f8777 (patch) | |
| tree | 380c0cc9a14dc4b5492f35473e88aee787b224ff /fs/nfs/pnfs.h | |
| parent | nfs41: close a small race window when adding new layout to global list (diff) | |
| download | kernel-qcow2-linux-9bf87482ddc6f8db884177a2a16b1a1dc12f8777.tar.gz kernel-qcow2-linux-9bf87482ddc6f8db884177a2a16b1a1dc12f8777.tar.xz kernel-qcow2-linux-9bf87482ddc6f8db884177a2a16b1a1dc12f8777.zip | |
nfs41: serialize first layoutget of a file
Per RFC 5661 Errata 3208:
| A client MAY always forget its layout state and associated
| layout stateid at any time (See also section 12.5.5.1).
| In such case, the client MUST use a non-layout stateid for the next
| LAYOUTGET operation. This will signal the server that the client has
| no more layouts on the file and its respective layout state can be
| released before issuing a new layout in response to LAYOUTGET.
In order to make such a signal unique to server, client needs to serialize
all layoutgets using non-layout stateid. We implement this by serializing
layoutgets when client has no layout segments at hand.
Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Tom Haynes <Thomas.Haynes@primarydata.com>
Diffstat (limited to 'fs/nfs/pnfs.h')
| -rw-r--r-- | fs/nfs/pnfs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h index c39882191651..4cf0d54e14c3 100644 --- a/fs/nfs/pnfs.h +++ b/fs/nfs/pnfs.h @@ -95,6 +95,7 @@ enum { NFS_LAYOUT_ROC, /* some lseg had roc bit set */ NFS_LAYOUT_RETURN, /* Return this layout ASAP */ NFS_LAYOUT_INVALID_STID, /* layout stateid id is invalid */ + NFS_LAYOUT_FIRST_LAYOUTGET, /* Serialize first layoutget */ }; enum layoutdriver_policy_flags { |