5 files changed, 40 insertions, 23 deletions

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 2a3d352c0bff..a8766c4ef2e0 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -1294,7 +1294,8 @@ static int nfs4_init_server(struct nfs_server *server,
 
         /* Initialise the client representation from the mount data */
         server->flags = data->flags;
-        server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
+        server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|
+                NFS_CAP_POSIX_LOCK;
         server->options = data->options;
 
         /* Get a client record */
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index c6f2750648f4..db3ad849a289 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -837,6 +837,8 @@ out_zap_parent:
                 /* If we have submounts, don't unhash ! */
                 if (have_submounts(dentry))
                         goto out_valid;
+                if (dentry->d_flags & DCACHE_DISCONNECTED)
+                        goto out_valid;
                 shrink_dcache_parent(dentry);
         }
         d_drop(dentry);
@@ -1025,12 +1027,12 @@ static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry
                                 res = NULL;
                                 goto out;
                         /* This turned out not to be a regular file */
+                        case -EISDIR:
                         case -ENOTDIR:
                                 goto no_open;
                         case -ELOOP:
                                 if (!(nd->intent.open.flags & O_NOFOLLOW))
                                         goto no_open;
-                        /* case -EISDIR: */
                         /* case -EINVAL: */
                         default:
                                 goto out;
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 737128f777f3..50a56edca0b5 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -623,10 +623,10 @@ struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_c
         list_for_each_entry(pos, &nfsi->open_files, list) {
                 if (cred != NULL && pos->cred != cred)
                         continue;
-                if ((pos->mode & mode) == mode) {
-                        ctx = get_nfs_open_context(pos);
-                        break;
-                }
+                if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
+                        continue;
+                ctx = get_nfs_open_context(pos);
+                break;
         }
         spin_unlock(&inode->i_lock);
         return ctx;
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index fe0cd9eb1d4d..638067007c65 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1523,6 +1523,8 @@ static int _nfs4_proc_open(struct nfs4_opendata *data)
                 nfs_post_op_update_inode(dir, o_res->dir_attr);
         } else
                 nfs_refresh_inode(dir, o_res->dir_attr);
+        if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
+                server->caps &= ~NFS_CAP_POSIX_LOCK;
         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
                 status = _nfs4_proc_open_confirm(data);
                 if (status != 0)
@@ -1664,7 +1666,7 @@ static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, in
         status = PTR_ERR(state);
         if (IS_ERR(state))
                 goto err_opendata_put;
-        if ((opendata->o_res.rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) != 0)
+        if (server->caps & NFS_CAP_POSIX_LOCK)
                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
         nfs4_opendata_put(opendata);
         nfs4_put_state_owner(sp);
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 53ff70e23993..de38d63aa920 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -201,6 +201,7 @@ static int nfs_set_page_writeback(struct page *page)
                 struct inode *inode = page->mapping->host;
                 struct nfs_server *nfss = NFS_SERVER(inode);
 
+                page_cache_get(page);
                 if (atomic_long_inc_return(&nfss->writeback) >
                                 NFS_CONGESTION_ON_THRESH) {
                         set_bdi_congested(&nfss->backing_dev_info,
@@ -216,6 +217,7 @@ static void nfs_end_page_writeback(struct page *page)
         struct nfs_server *nfss = NFS_SERVER(inode);
 
         end_page_writeback(page);
+        page_cache_release(page);
         if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
                 clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
 }
@@ -421,6 +423,7 @@ static void
 nfs_mark_request_dirty(struct nfs_page *req)
 {
         __set_page_dirty_nobuffers(req->wb_page);
+        __mark_inode_dirty(req->wb_page->mapping->host, I_DIRTY_DATASYNC);
 }
 
 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
@@ -660,9 +663,11 @@ static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
         req = nfs_setup_write_request(ctx, page, offset, count);
         if (IS_ERR(req))
                 return PTR_ERR(req);
+        nfs_mark_request_dirty(req);
         /* Update file length */
         nfs_grow_file(page, offset, count);
         nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes);
+        nfs_mark_request_dirty(req);
         nfs_clear_page_tag_locked(req);
         return 0;
 }
@@ -739,8 +744,6 @@ int nfs_updatepage(struct file *file, struct page *page,
         status = nfs_writepage_setup(ctx, page, offset, count);
         if (status < 0)
                 nfs_set_pageerror(page);
-        else
-                __set_page_dirty_nobuffers(page);
 
         dprintk("NFS:       nfs_updatepage returns %d (isize %lld)\n",
                         status, (long long)i_size_read(inode));
@@ -749,13 +752,12 @@ int nfs_updatepage(struct file *file, struct page *page,
 
 static void nfs_writepage_release(struct nfs_page *req)
 {
+        struct page *page = req->wb_page;
 
-        if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req)) {
-                nfs_end_page_writeback(req->wb_page);
+        if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req))
                 nfs_inode_remove_request(req);
-        } else
-                nfs_end_page_writeback(req->wb_page);
         nfs_clear_page_tag_locked(req);
+        nfs_end_page_writeback(page);
 }
 
 static int flush_task_priority(int how)
@@ -779,7 +781,6 @@ static int nfs_write_rpcsetup(struct nfs_page *req,
                 int how)
 {
         struct inode *inode = req->wb_context->path.dentry->d_inode;
-        int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
         int priority = flush_task_priority(how);
         struct rpc_task *task;
         struct rpc_message msg = {
@@ -794,9 +795,10 @@ static int nfs_write_rpcsetup(struct nfs_page *req,
                 .callback_ops = call_ops,
                 .callback_data = data,
                 .workqueue = nfsiod_workqueue,
-                .flags = flags,
+                .flags = RPC_TASK_ASYNC,
                 .priority = priority,
         };
+        int ret = 0;
 
         /* Set up the RPC argument and reply structs
          * NB: take care not to mess about with data->commit et al. */
@@ -835,10 +837,18 @@ static int nfs_write_rpcsetup(struct nfs_page *req,
                 (unsigned long long)data->args.offset);
 
         task = rpc_run_task(&task_setup_data);
-        if (IS_ERR(task))
-                return PTR_ERR(task);
+        if (IS_ERR(task)) {
+                ret = PTR_ERR(task);
+                goto out;
+        }
+        if (how & FLUSH_SYNC) {
+                ret = rpc_wait_for_completion_task(task);
+                if (ret == 0)
+                        ret = task->tk_status;
+        }
         rpc_put_task(task);
-        return 0;
+out:
+        return ret;
 }
 
 /* If a nfs_flush_* function fails, it should remove reqs from @head and
@@ -847,9 +857,11 @@ static int nfs_write_rpcsetup(struct nfs_page *req,
  */
 static void nfs_redirty_request(struct nfs_page *req)
 {
+        struct page *page = req->wb_page;
+
         nfs_mark_request_dirty(req);
-        nfs_end_page_writeback(req->wb_page);
         nfs_clear_page_tag_locked(req);
+        nfs_end_page_writeback(page);
 }
 
 /*
@@ -1084,16 +1096,15 @@ static void nfs_writeback_release_full(void *calldata)
                 if (nfs_write_need_commit(data)) {
                         memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
                         nfs_mark_request_commit(req);
-                        nfs_end_page_writeback(page);
                         dprintk(" marked for commit\n");
                         goto next;
                 }
                 dprintk(" OK\n");
 remove_request:
-                nfs_end_page_writeback(page);
                 nfs_inode_remove_request(req);
         next:
                 nfs_clear_page_tag_locked(req);
+                nfs_end_page_writeback(page);
         }
         nfs_writedata_release(calldata);
 }
@@ -1207,7 +1218,6 @@ static int nfs_commit_rpcsetup(struct list_head *head,
 {
         struct nfs_page *first = nfs_list_entry(head->next);
         struct inode *inode = first->wb_context->path.dentry->d_inode;
-        int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
         int priority = flush_task_priority(how);
         struct rpc_task *task;
         struct rpc_message msg = {
@@ -1222,7 +1232,7 @@ static int nfs_commit_rpcsetup(struct list_head *head,
                 .callback_ops = &nfs_commit_ops,
                 .callback_data = data,
                 .workqueue = nfsiod_workqueue,
-                .flags = flags,
+                .flags = RPC_TASK_ASYNC,
                 .priority = priority,
         };
 
@@ -1252,6 +1262,8 @@ static int nfs_commit_rpcsetup(struct list_head *head,
         task = rpc_run_task(&task_setup_data);
         if (IS_ERR(task))
                 return PTR_ERR(task);
+        if (how & FLUSH_SYNC)
+                rpc_wait_for_completion_task(task);
         rpc_put_task(task);
         return 0;
 }