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NFSv4: Don't return the delegation when not needed by NFSv4.x (x>0)

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Starting with NFSv4.1, the server is able to deduce the client id from
the SEQUENCE op which means it can always figure out whether or not
the client is holding a delegation on a file that is being changed.
For that reason, RFC5661 does not require a delegation to be unconditionally
recalled on operations such as SETATTR, RENAME, or REMOVE.

Note that for now, we continue to return READ delegations since that is
still expected by the Linux knfsd server.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust
2018-03-20 16:43:20 -04:00
committed by Anna Schumaker
parent c135cb39a9
commit c01d36457d
3 changed files with 28 additions and 6 deletions
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17
fs/nfs/delegation.c
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@@ -19,6 +19,7 @@
#include <linux/nfs_xdr.h>
#include "nfs4_fs.h"
#include "nfs4session.h"
#include "delegation.h"
#include "internal.h"
#include "nfs4trace.h"
@@ -547,6 +548,22 @@ int nfs4_inode_return_delegation(struct inode *inode)
return err;
}
/**
* nfs4_inode_make_writeable
* @inode: pointer to inode
*
* Make the inode writeable by returning the delegation if necessary
*
* Returns zero on success, or a negative errno value.
*/
int nfs4_inode_make_writeable(struct inode *inode)
{
if (!nfs4_has_session(NFS_SERVER(inode)->nfs_client) ||
!nfs4_check_delegation(inode, FMODE_WRITE))
return nfs4_inode_return_delegation(inode);
return 0;
}
static void nfs_mark_return_if_closed_delegation(struct nfs_server *server,
struct nfs_delegation *delegation)
{