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>
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index cee8714..deaf37f 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -236,6 +236,7 @@
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 de9ff15..5d3e8a2 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4414,6 +4414,34 @@
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 13e17e3..13a4f27 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -701,6 +701,8 @@
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 49df05a..15185c2 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -220,6 +220,11 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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),
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index 9b8299a..07e40c6 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -523,6 +523,7 @@
NFSPROC4_CLNT_GETACL,
NFSPROC4_CLNT_SETACL,
NFSPROC4_CLNT_FS_LOCATIONS,
+ NFSPROC4_CLNT_RELEASE_LOCKOWNER,
/* nfs41 */
NFSPROC4_CLNT_EXCHANGE_ID,
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 87202c7..fc46192 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -315,6 +315,10 @@
struct nfs4_sequence_res seq_res;
};
+struct nfs_release_lockowner_args {
+ struct nfs_lowner lock_owner;
+};
+
struct nfs4_delegreturnargs {
const struct nfs_fh *fhandle;
const nfs4_stateid *stateid;