NFSv4: Add support for the RELEASE_LOCKOWNER operation

This is needed by NFSv4.0 servers in order to keep the number of locking
stateids at a manageable level.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

4 files changed, 86 insertions, 0 deletions

diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index cee871471e8d..deaf37f5a7a9 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -236,6 +236,7 @@ extern int nfs4_open_revalidate(struct inode *, struct dentry *, int, struct nam
 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 extern int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
                 struct nfs4_fs_locations *fs_locations, struct page *page);
+extern void nfs4_release_lockowner(const struct nfs4_lock_state *);
 
 #if defined(CONFIG_NFS_V4_1)
 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index de9ff1505a24..5d3e8a2db99f 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4414,6 +4414,34 @@ out:
         return err;
 }
 
+static void nfs4_release_lockowner_release(void *calldata)
+{
+        kfree(calldata);
+}
+
+const struct rpc_call_ops nfs4_release_lockowner_ops = {
+        .rpc_release = nfs4_release_lockowner_release,
+};
+
+void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
+{
+        struct nfs_server *server = lsp->ls_state->owner->so_server;
+        struct nfs_release_lockowner_args *args;
+        struct rpc_message msg = {
+                .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
+        };
+
+        if (server->nfs_client->cl_mvops->minor_version != 0)
+                return;
+        args = kmalloc(sizeof(*args), GFP_NOFS);
+        if (!args)
+                return;
+        args->lock_owner.clientid = server->nfs_client->cl_clientid;
+        args->lock_owner.id = lsp->ls_id.id;
+        msg.rpc_argp = args;
+        rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
+}
+
 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
 
 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 13e17e32e3e4..13a4f27e7271 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -701,6 +701,8 @@ void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
         if (list_empty(&state->lock_states))
                 clear_bit(LK_STATE_IN_USE, &state->flags);
         spin_unlock(&state->state_lock);
+        if (lsp->ls_flags & NFS_LOCK_INITIALIZED)
+                nfs4_release_lockowner(lsp);
         nfs4_free_lock_state(lsp);
 }
 
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 49df05afdc64..15185c2abd11 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -220,6 +220,11 @@ static int nfs4_stat_to_errno(int);
                                  4)
 #define decode_locku_maxsz      (op_decode_hdr_maxsz + \
                                  decode_stateid_maxsz)
+#define encode_release_lockowner_maxsz \
+                                (op_encode_hdr_maxsz + \
+                                 encode_lockowner_maxsz)
+#define decode_release_lockowner_maxsz \
+                                (op_decode_hdr_maxsz)
 #define encode_access_maxsz     (op_encode_hdr_maxsz + 1)
 #define decode_access_maxsz     (op_decode_hdr_maxsz + 2)
 #define encode_symlink_maxsz    (op_encode_hdr_maxsz + \
@@ -474,6 +479,12 @@ static int nfs4_stat_to_errno(int);
                                 decode_sequence_maxsz + \
                                 decode_putfh_maxsz + \
                                 decode_locku_maxsz)
+#define NFS4_enc_release_lockowner_sz \
+                                (compound_encode_hdr_maxsz + \
+                                 encode_lockowner_maxsz)
+#define NFS4_dec_release_lockowner_sz \
+                                (compound_decode_hdr_maxsz + \
+                                 decode_lockowner_maxsz)
 #define NFS4_enc_access_sz      (compound_encode_hdr_maxsz + \
                                 encode_sequence_maxsz + \
                                 encode_putfh_maxsz + \
@@ -1116,6 +1127,17 @@ static void encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *ar
         hdr->replen += decode_locku_maxsz;
 }
 
+static void encode_release_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner, struct compound_hdr *hdr)
+{
+        __be32 *p;
+
+        p = reserve_space(xdr, 4);
+        *p = cpu_to_be32(OP_RELEASE_LOCKOWNER);
+        encode_lockowner(xdr, lowner);
+        hdr->nops++;
+        hdr->replen += decode_release_lockowner_maxsz;
+}
+
 static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
 {
         int len = name->len;
@@ -2056,6 +2078,20 @@ static int nfs4_xdr_enc_locku(struct rpc_rqst *req, __be32 *p, struct nfs_locku_
         return 0;
 }
 
+static int nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req, __be32 *p, struct nfs_release_lockowner_args *args)
+{
+        struct xdr_stream xdr;
+        struct compound_hdr hdr = {
+                .minorversion = 0,
+        };
+
+        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+        encode_compound_hdr(&xdr, req, &hdr);
+        encode_release_lockowner(&xdr, &args->lock_owner, &hdr);
+        encode_nops(&hdr);
+        return 0;
+}
+
 /*
  * Encode a READLINK request
  */
@@ -3981,6 +4017,11 @@ static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
         return status;
 }
 
+static int decode_release_lockowner(struct xdr_stream *xdr)
+{
+        return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
+}
+
 static int decode_lookup(struct xdr_stream *xdr)
 {
         return decode_op_hdr(xdr, OP_LOOKUP);
@@ -5267,6 +5308,19 @@ out:
         return status;
 }
 
+static int nfs4_xdr_dec_release_lockowner(struct rpc_rqst *rqstp, __be32 *p, void *dummy)
+{
+        struct xdr_stream xdr;
+        struct compound_hdr hdr;
+        int status;
+
+        xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
+        status = decode_compound_hdr(&xdr, &hdr);
+        if (!status)
+                status = decode_release_lockowner(&xdr);
+        return status;
+}
+
 /*
  * Decode READLINK response
  */
@@ -5874,6 +5928,7 @@ struct rpc_procinfo	nfs4_procedures[] = {
   PROC(GETACL,          enc_getacl,     dec_getacl),
   PROC(SETACL,          enc_setacl,     dec_setacl),
   PROC(FS_LOCATIONS,    enc_fs_locations, dec_fs_locations),
+  PROC(RELEASE_LOCKOWNER, enc_release_lockowner, dec_release_lockowner),
 #if defined(CONFIG_NFS_V4_1)
   PROC(EXCHANGE_ID,     enc_exchange_id,        dec_exchange_id),
   PROC(CREATE_SESSION,  enc_create_session,     dec_create_session),