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nfs: convert setclientid and exchange_id encoders to use clp->cl_owner_id

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...instead of buffers that are part of their arg structs. We already
hold a reference to the client, so we might as well use the allocated
buffer. In the event that we can't allocate the clp->cl_owner_id, then
just return -ENOMEM.

Note too that we switch from a GFP_KERNEL allocation here to GFP_NOFS.
It's possible we could end up trying to do a SETCLIENTID or EXCHANGE_ID
in order to reclaim some memory, and the GFP_KERNEL allocations in the
existing code could cause recursion back into NFS reclaim.

Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Jeff Layton
2015-06-09 19:43:57 -04:00
committed by Trond Myklebust
parent 764ad8ba8c
commit 3a6bb73879
3 changed files with 22 additions and 9 deletions
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include/linux/nfs_xdr.h
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@@ -994,7 +994,7 @@ struct nfs4_setclientid {
char sc_netid[RPCBIND_MAXNETIDLEN + 1];
unsigned int sc_uaddr_len;
char sc_uaddr[RPCBIND_MAXUADDRLEN + 1];
u32 sc_cb_ident;
struct nfs_client *sc_clnt;
struct rpc_cred *sc_cred;
};