nfsd: make NFSd service structure allocated per net

This patch makes main step in NFSd containerisation.

There could be different approaches to how to make NFSd able to handle
incoming RPC request from different network namespaces.  The two main
options are:

1) Share NFSd kthreads betwween all network namespaces.
2) Create separated pool of threads for each namespace.

While first approach looks more flexible, second one is simpler and
non-racy.  This patch implements the second option.

To make it possible to allocate separate pools of threads, we have to
make it possible to allocate separate NFSd service structures per net.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 16e954c1c91..3d27f08e229 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -743,9 +743,12 @@ out_free:
 	return NULL;
 }
 
-static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4_channel_attrs *req, int numslots, int slotsize)
+static void init_forechannel_attrs(struct nfsd4_channel_attrs *new,
+				   struct nfsd4_channel_attrs *req,
+				   int numslots, int slotsize,
+				   struct nfsd_net *nn)
 {
-	u32 maxrpc = nfsd_serv->sv_max_mesg;
+	u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
 
 	new->maxreqs = numslots;
 	new->maxresp_cached = min_t(u32, req->maxresp_cached,
@@ -883,7 +886,8 @@ void nfsd4_put_session(struct nfsd4_session *ses)
 	spin_unlock(&nn->client_lock);
 }
 
-static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fchan)
+static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fchan,
+					   struct nfsd_net *nn)
 {
 	struct nfsd4_session *new;
 	int numslots, slotsize;
@@ -904,7 +908,7 @@ static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fchan)
 		nfsd4_put_drc_mem(slotsize, fchan->maxreqs);
 		return NULL;
 	}
-	init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize);
+	init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize, nn);
 	return new;
 }
 
@@ -1776,7 +1780,7 @@ nfsd4_create_session(struct svc_rqst *rqstp,
 		return nfserr_inval;
 	if (check_forechannel_attrs(cr_ses->fore_channel))
 		return nfserr_toosmall;
-	new = alloc_session(&cr_ses->fore_channel);
+	new = alloc_session(&cr_ses->fore_channel, nn);
 	if (!new)
 		return nfserr_jukebox;
 	status = nfserr_jukebox;