NFSv4: Don't free the nfs4_lock_state until after the release_lockowner

Otherwise we can end up with sequence id problems if the client reuses
the owner_id before the server has processed the release_lockowner

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

3 files changed, 28 insertions, 15 deletions

diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 16373df96f90..026878cb2698 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -213,7 +213,7 @@ extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, boo
 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 *);
+extern int nfs4_release_lockowner(struct nfs4_lock_state *);
 extern const struct xattr_handler *nfs4_xattr_handlers[];
 
 #if defined(CONFIG_NFS_V4_1)
@@ -338,6 +338,8 @@ extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 extern void nfs_release_seqid(struct nfs_seqid *seqid);
 extern void nfs_free_seqid(struct nfs_seqid *seqid);
 
+extern void nfs4_free_lock_state(struct nfs4_lock_state *lsp);
+
 extern const nfs4_stateid zero_stateid;
 
 /* nfs4xdr.c */
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 1ec05222ccbc..32e0d08a9771 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4745,8 +4745,15 @@ out:
         return err;
 }
 
+struct nfs_release_lockowner_data {
+        struct nfs4_lock_state *lsp;
+        struct nfs_release_lockowner_args args;
+};
+
 static void nfs4_release_lockowner_release(void *calldata)
 {
+        struct nfs_release_lockowner_data *data = calldata;
+        nfs4_free_lock_state(data->lsp);
         kfree(calldata);
 }
 
@@ -4754,24 +4761,26 @@ 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)
+int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
 {
         struct nfs_server *server = lsp->ls_state->owner->so_server;
-        struct nfs_release_lockowner_args *args;
+        struct nfs_release_lockowner_data *data;
         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_seqid.owner_id;
-        args->lock_owner.s_dev = server->s_dev;
-        msg.rpc_argp = args;
-        rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
+                return -EINVAL;
+        data = kmalloc(sizeof(*data), GFP_NOFS);
+        if (!data)
+                return -ENOMEM;
+        data->lsp = lsp;
+        data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
+        data->args.lock_owner.id = lsp->ls_seqid.owner_id;
+        data->args.lock_owner.s_dev = server->s_dev;
+        msg.rpc_argp = &data->args;
+        rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
+        return 0;
 }
 
 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index a58d02a0c27d..7adc46b4c7f8 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -784,7 +784,7 @@ out_free:
         return NULL;
 }
 
-static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
+void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
 {
         struct nfs_server *server = lsp->ls_state->owner->so_server;
 
@@ -842,8 +842,10 @@ 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);
+        if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
+                if (nfs4_release_lockowner(lsp) == 0)
+                        return;
+        }
         nfs4_free_lock_state(lsp);
 }