NFSv4: Make NFS clean up byte range locks asynchronously

 Currently we fail to do so if the process was signalled.

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

1 files changed, 110 insertions, 51 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index f57dba815099..612a9a14aed3 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -58,9 +58,9 @@
 
 static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid);
 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
-static int nfs4_async_handle_error(struct rpc_task *, struct nfs_server *);
+static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
-static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
+static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
 extern struct rpc_procinfo nfs4_procedures[];
 
@@ -2422,7 +2422,7 @@ static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen
 }
 
 static int
-nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server)
+nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
 {
         struct nfs4_client *clp = server->nfs4_state;
 
@@ -2500,7 +2500,7 @@ static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 /* This is the error handling routine for processes that are allowed
  * to sleep.
  */
-int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
+int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 {
         struct nfs4_client *clp = server->nfs4_state;
         int ret = errorcode;
@@ -2763,68 +2763,127 @@ static int do_vfs_lock(struct file *file, struct file_lock *fl)
         return res;
 }
 
-static int _nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
+struct nfs4_unlockdata {
+        struct nfs_lockargs arg;
+        struct nfs_locku_opargs luargs;
+        struct nfs_lockres res;
+        struct nfs4_lock_state *lsp;
+        struct nfs_open_context *ctx;
+        atomic_t refcount;
+        struct completion completion;
+};
+
+static void nfs4_locku_release_calldata(struct nfs4_unlockdata *calldata)
 {
-        struct inode *inode = state->inode;
-        struct nfs_server *server = NFS_SERVER(inode);
-        struct nfs_lockargs arg = {
-                .fh = NFS_FH(inode),
-                .type = nfs4_lck_type(cmd, request),
-                .offset = request->fl_start,
-                .length = nfs4_lck_length(request),
-        };
-        struct nfs_lockres res = {
-                .server = server,
-        };
+        if (atomic_dec_and_test(&calldata->refcount)) {
+                nfs_free_seqid(calldata->luargs.seqid);
+                nfs4_put_lock_state(calldata->lsp);
+                put_nfs_open_context(calldata->ctx);
+                kfree(calldata);
+        }
+}
+
+static void nfs4_locku_complete(struct nfs4_unlockdata *calldata)
+{
+        complete(&calldata->completion);
+        nfs4_locku_release_calldata(calldata);
+}
+
+static void nfs4_locku_done(struct rpc_task *task)
+{
+        struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
+
+        nfs_increment_lock_seqid(task->tk_status, calldata->luargs.seqid);
+        switch (task->tk_status) {
+                case 0:
+                        memcpy(calldata->lsp->ls_stateid.data,
+                                        calldata->res.u.stateid.data,
+                                        sizeof(calldata->lsp->ls_stateid.data));
+                        break;
+                case -NFS4ERR_STALE_STATEID:
+                case -NFS4ERR_EXPIRED:
+                        nfs4_schedule_state_recovery(calldata->res.server->nfs4_state);
+                        break;
+                default:
+                        if (nfs4_async_handle_error(task, calldata->res.server) == -EAGAIN) {
+                                rpc_restart_call(task);
+                                return;
+                        }
+        }
+        nfs4_locku_complete(calldata);
+}
+
+static void nfs4_locku_begin(struct rpc_task *task)
+{
+        struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
         struct rpc_message msg = {
                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
-                .rpc_argp       = &arg,
-                .rpc_resp       = &res,
-                .rpc_cred       = state->owner->so_cred,
+                .rpc_argp       = &calldata->arg,
+                .rpc_resp       = &calldata->res,
+                .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
         };
+        int status;
+
+        status = nfs_wait_on_sequence(calldata->luargs.seqid, task);
+        if (status != 0)
+                return;
+        if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
+                nfs4_locku_complete(calldata);
+                task->tk_exit = NULL;
+                rpc_exit(task, 0);
+                return;
+        }
+        rpc_call_setup(task, &msg, 0);
+}
+
+static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+        struct nfs4_unlockdata *calldata;
+        struct inode *inode = state->inode;
+        struct nfs_server *server = NFS_SERVER(inode);
         struct nfs4_lock_state *lsp;
-        struct nfs_locku_opargs luargs;
         int status;
-                        
+
         status = nfs4_set_lock_state(state, request);
         if (status != 0)
-                goto out;
+                return status;
         lsp = request->fl_u.nfs4_fl.owner;
         /* We might have lost the locks! */
         if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0)
-                goto out;
-        luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid);
-        status = -ENOMEM;
-        if (luargs.seqid == NULL)
-                goto out;
-        memcpy(luargs.stateid.data, lsp->ls_stateid.data, sizeof(luargs.stateid.data));
-        arg.u.locku = &luargs;
-        status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
-        nfs_increment_lock_seqid(status, luargs.seqid);
-
-        if (status == 0)
-                memcpy(lsp->ls_stateid.data, res.u.stateid.data, 
-                                sizeof(lsp->ls_stateid.data));
-        nfs_free_seqid(luargs.seqid);
-out:
+                return 0;
+        calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
+        if (calldata == NULL)
+                return -ENOMEM;
+        calldata->luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid);
+        if (calldata->luargs.seqid == NULL) {
+                kfree(calldata);
+                return -ENOMEM;
+        }
+        calldata->luargs.stateid = &lsp->ls_stateid;
+        calldata->arg.fh = NFS_FH(inode);
+        calldata->arg.type = nfs4_lck_type(cmd, request);
+        calldata->arg.offset = request->fl_start;
+        calldata->arg.length = nfs4_lck_length(request);
+        calldata->arg.u.locku = &calldata->luargs;
+        calldata->res.server = server;
+        calldata->lsp = lsp;
+        atomic_inc(&lsp->ls_count);
+
+        /* Ensure we don't close file until we're done freeing locks! */
+        calldata->ctx = get_nfs_open_context((struct nfs_open_context*)request->fl_file->private_data);
+
+        atomic_set(&calldata->refcount, 2);
+        init_completion(&calldata->completion);
+
+        status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_locku_begin,
+                        nfs4_locku_done, calldata);
         if (status == 0)
-                do_vfs_lock(request->fl_file, request);
+                wait_for_completion_interruptible(&calldata->completion);
+        do_vfs_lock(request->fl_file, request);
+        nfs4_locku_release_calldata(calldata);
         return status;
 }
 
-static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
-{
-        struct nfs4_exception exception = { };
-        int err;
-
-        do {
-                err = nfs4_handle_exception(NFS_SERVER(state->inode),
-                                _nfs4_proc_unlck(state, cmd, request),
-                                &exception);
-        } while (exception.retry);
-        return err;
-}
-
 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
 {
         struct inode *inode = state->inode;