Merge tag 'nfs-for-3.7-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfixes from Trond Myklebust:
 - Do not call pnfs_return_layout() from an rpciod context
 - nfs4_ds_disconnect can cause Oopses.  Kill it...
 - Fix the return value for nfs_callback_start_svc
 - Fix a number of compile warnings

* tag 'nfs-for-3.7-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFSv4: Fix the return value for nfs_callback_start_svc
  NFSv4.1: Declare osd_pri_2_pnfs_err(), objio_init_read/write to be static
  NFSv4: fs/nfs/nfs4getroot.c needs to include "internal.h"
  NFSv4.1: Use kcalloc() to allocate zeroed arrays instead of kzalloc()
  NFSv4.1: Do not call pnfs_return_layout() from an rpciod context
  NFSv4.1: Kill nfs4_ds_disconnect()

fs/nfs/callback.c

@@ -241,7 +241,7 @@ static int nfs_callback_start_svc(int minorversion, struct rpc_xprt *xprt,
 		svc_exit_thread(cb_info->rqst);
 		cb_info->rqst = NULL;
 		cb_info->task = NULL;
-		return PTR_ERR(cb_info->task);
+		return ret;
 	}
 	dprintk("nfs_callback_up: service started\n");
 	return 0;

fs/nfs/nfs4filelayout.c

@@ -122,12 +122,21 @@ static void filelayout_reset_read(struct nfs_read_data *data)
 	}
 }
 
+static void filelayout_fenceme(struct inode *inode, struct pnfs_layout_hdr *lo)
+{
+	if (!test_and_clear_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
+		return;
+	clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(inode)->flags);
+	pnfs_return_layout(inode);
+}
+
 static int filelayout_async_handle_error(struct rpc_task *task,
 					 struct nfs4_state *state,
 					 struct nfs_client *clp,
 					 struct pnfs_layout_segment *lseg)
 {
-	struct inode *inode = lseg->pls_layout->plh_inode;
+	struct pnfs_layout_hdr *lo = lseg->pls_layout;
+	struct inode *inode = lo->plh_inode;
 	struct nfs_server *mds_server = NFS_SERVER(inode);
 	struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg);
 	struct nfs_client *mds_client = mds_server->nfs_client;
@@ -204,10 +213,8 @@ static int filelayout_async_handle_error(struct rpc_task *task,
 		dprintk("%s DS connection error %d\n", __func__,
 			task->tk_status);
 		nfs4_mark_deviceid_unavailable(devid);
-		clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(inode)->flags);
-		_pnfs_return_layout(inode);
+		set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
 		rpc_wake_up(&tbl->slot_tbl_waitq);
-		nfs4_ds_disconnect(clp);
 		/* fall through */
 	default:
 reset:
@@ -331,7 +338,9 @@ static void filelayout_read_count_stats(struct rpc_task *task, void *data)
 static void filelayout_read_release(void *data)
 {
 	struct nfs_read_data *rdata = data;
+	struct pnfs_layout_hdr *lo = rdata->header->lseg->pls_layout;
 
+	filelayout_fenceme(lo->plh_inode, lo);
 	nfs_put_client(rdata->ds_clp);
 	rdata->header->mds_ops->rpc_release(data);
 }
@@ -429,7 +438,9 @@ static void filelayout_write_count_stats(struct rpc_task *task, void *data)
 static void filelayout_write_release(void *data)
 {
 	struct nfs_write_data *wdata = data;
+	struct pnfs_layout_hdr *lo = wdata->header->lseg->pls_layout;
 
+	filelayout_fenceme(lo->plh_inode, lo);
 	nfs_put_client(wdata->ds_clp);
 	wdata->header->mds_ops->rpc_release(data);
 }
@@ -739,7 +750,7 @@ filelayout_decode_layout(struct pnfs_layout_hdr *flo,
 		goto out_err;
 
 	if (fl->num_fh > 0) {
-		fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *),
+		fl->fh_array = kcalloc(fl->num_fh, sizeof(fl->fh_array[0]),
 				       gfp_flags);
 		if (!fl->fh_array)
 			goto out_err;

fs/nfs/nfs4filelayout.h

@@ -149,6 +149,5 @@ extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
 extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
 struct nfs4_file_layout_dsaddr *
 filelayout_get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id, gfp_t gfp_flags);
-void nfs4_ds_disconnect(struct nfs_client *clp);
 
 #endif /* FS_NFS_NFS4FILELAYOUT_H */

fs/nfs/nfs4filelayoutdev.c

@@ -148,28 +148,6 @@ _data_server_lookup_locked(const struct list_head *dsaddrs)
 	return NULL;
 }
 
-/*
- * Lookup DS by nfs_client pointer. Zero data server client pointer
- */
-void nfs4_ds_disconnect(struct nfs_client *clp)
-{
-	struct nfs4_pnfs_ds *ds;
-	struct nfs_client *found = NULL;
-
-	dprintk("%s clp %p\n", __func__, clp);
-	spin_lock(&nfs4_ds_cache_lock);
-	list_for_each_entry(ds, &nfs4_data_server_cache, ds_node)
-		if (ds->ds_clp && ds->ds_clp == clp) {
-			found = ds->ds_clp;
-			ds->ds_clp = NULL;
-		}
-	spin_unlock(&nfs4_ds_cache_lock);
-	if (found) {
-		set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
-		nfs_put_client(clp);
-	}
-}
-
 /*
  * Create an rpc connection to the nfs4_pnfs_ds data server
  * Currently only supports IPv4 and IPv6 addresses

fs/nfs/nfs4getroot.c

@@ -5,6 +5,7 @@
 
 #include <linux/nfs_fs.h>
 #include "nfs4_fs.h"
+#include "internal.h"
 
 #define NFSDBG_FACILITY		NFSDBG_CLIENT
 

fs/nfs/objlayout/objio_osd.c

@@ -369,7 +369,7 @@ void objio_free_result(struct objlayout_io_res *oir)
 	kfree(objios);
 }
 
-enum pnfs_osd_errno osd_pri_2_pnfs_err(enum osd_err_priority oep)
+static enum pnfs_osd_errno osd_pri_2_pnfs_err(enum osd_err_priority oep)
 {
 	switch (oep) {
 	case OSD_ERR_PRI_NO_ERROR:
@@ -574,7 +574,7 @@ static bool objio_pg_test(struct nfs_pageio_descriptor *pgio,
 			(unsigned long)pgio->pg_layout_private;
 }
 
-void objio_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
+static void objio_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
 {
 	pnfs_generic_pg_init_read(pgio, req);
 	if (unlikely(pgio->pg_lseg == NULL))
@@ -604,7 +604,7 @@ static bool aligned_on_raid_stripe(u64 offset, struct ore_layout *layout,
 	return false;
 }
 
-void objio_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
+static void objio_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
 {
 	unsigned long stripe_end = 0;
 	u64 wb_size;

fs/nfs/pnfs.h

@@ -62,6 +62,7 @@ enum {
 	NFS_LAYOUT_RW_FAILED,		/* get rw layout failed stop trying */
 	NFS_LAYOUT_BULK_RECALL,		/* bulk recall affecting layout */
 	NFS_LAYOUT_ROC,			/* some lseg had roc bit set */
+	NFS_LAYOUT_RETURN,		/* Return this layout ASAP */
 };
 
 enum layoutdriver_policy_flags {