1 files changed, 24 insertions, 15 deletions

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 91679e2631ee..874972d9427c 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -222,7 +222,7 @@ static void nfs_end_page_writeback(struct page *page)
                 clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
 }
 
-static struct nfs_page *nfs_find_and_lock_request(struct page *page)
+static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock)
 {
         struct inode *inode = page->mapping->host;
         struct nfs_page *req;
@@ -241,7 +241,10 @@ static struct nfs_page *nfs_find_and_lock_request(struct page *page)
                  *       request as dirty (in which case we don't care).
                  */
                 spin_unlock(&inode->i_lock);
-                ret = nfs_wait_on_request(req);
+                if (!nonblock)
+                        ret = nfs_wait_on_request(req);
+                else
+                        ret = -EAGAIN;
                 nfs_release_request(req);
                 if (ret != 0)
                         return ERR_PTR(ret);
@@ -256,12 +259,12 @@ static struct nfs_page *nfs_find_and_lock_request(struct page *page)
  * May return an error if the user signalled nfs_wait_on_request().
  */
 static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
-                                struct page *page)
+                                struct page *page, bool nonblock)
 {
         struct nfs_page *req;
         int ret = 0;
 
-        req = nfs_find_and_lock_request(page);
+        req = nfs_find_and_lock_request(page, nonblock);
         if (!req)
                 goto out;
         ret = PTR_ERR(req);
@@ -283,12 +286,20 @@ out:
 static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
 {
         struct inode *inode = page->mapping->host;
+        int ret;
 
         nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
         nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
 
         nfs_pageio_cond_complete(pgio, page->index);
-        return nfs_page_async_flush(pgio, page);
+        ret = nfs_page_async_flush(pgio, page,
+                        wbc->sync_mode == WB_SYNC_NONE ||
+                        wbc->nonblocking != 0);
+        if (ret == -EAGAIN) {
+                redirty_page_for_writepage(wbc, page);
+                ret = 0;
+        }
+        return ret;
 }
 
 /*
@@ -689,7 +700,9 @@ int nfs_flush_incompatible(struct file *file, struct page *page)
                 req = nfs_page_find_request(page);
                 if (req == NULL)
                         return 0;
-                do_flush = req->wb_page != page || req->wb_context != ctx;
+                do_flush = req->wb_page != page || req->wb_context != ctx ||
+                        req->wb_lock_context->lockowner != current->files ||
+                        req->wb_lock_context->pid != current->tgid;
                 nfs_release_request(req);
                 if (!do_flush)
                         return 0;
@@ -813,6 +826,7 @@ static int nfs_write_rpcsetup(struct nfs_page *req,
         data->args.pages  = data->pagevec;
         data->args.count  = count;
         data->args.context = get_nfs_open_context(req->wb_context);
+        data->args.lock_context = req->wb_lock_context;
         data->args.stable  = NFS_UNSTABLE;
         if (how & FLUSH_STABLE) {
                 data->args.stable = NFS_DATA_SYNC;
@@ -1036,9 +1050,9 @@ out:
 void nfs_write_prepare(struct rpc_task *task, void *calldata)
 {
         struct nfs_write_data *data = calldata;
-        struct nfs_client *clp = (NFS_SERVER(data->inode))->nfs_client;
 
-        if (nfs4_setup_sequence(clp, &data->args.seq_args,
+        if (nfs4_setup_sequence(NFS_SERVER(data->inode),
+                                &data->args.seq_args,
                                 &data->res.seq_res, 1, task))
                 return;
         rpc_call_start(task);
@@ -1379,7 +1393,7 @@ static const struct rpc_call_ops nfs_commit_ops = {
         .rpc_release = nfs_commit_release,
 };
 
-static int nfs_commit_inode(struct inode *inode, int how)
+int nfs_commit_inode(struct inode *inode, int how)
 {
         LIST_HEAD(head);
         int may_wait = how & FLUSH_SYNC;
@@ -1443,11 +1457,6 @@ out_mark_dirty:
         return ret;
 }
 #else
-static int nfs_commit_inode(struct inode *inode, int how)
-{
-        return 0;
-}
-
 static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
 {
         return 0;
@@ -1546,7 +1555,7 @@ int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
 
         nfs_fscache_release_page(page, GFP_KERNEL);
 
-        req = nfs_find_and_lock_request(page);
+        req = nfs_find_and_lock_request(page, false);
         ret = PTR_ERR(req);
         if (IS_ERR(req))
                 goto out;