Merge git://git.linux-nfs.org/pub/linux/nfs-2.6

* git://git.linux-nfs.org/pub/linux/nfs-2.6:
  NFSv4: Fix an rpc_cred reference leakage in fs/nfs/delegation.c
  NFSv4: Ensure that we wait for the CLOSE request to complete
  NFS: Fix a race in sillyrename
  NFS: Fix a writeback race...

9 files changed, 175 insertions, 36 deletions

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index af8b235..11833f4 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -168,7 +168,8 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
 	spin_unlock(&inode->i_lock);
 
 	spin_unlock(&clp->cl_lock);
-	kfree(delegation);
+	if (delegation != NULL)
+		nfs_free_delegation(delegation);
 	return status;
 }
 
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 8ec7fbd..3533453 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -562,6 +562,7 @@ static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 	nfs_fattr_init(&fattr);
 	desc->entry = &my_entry;
 
+	nfs_block_sillyrename(dentry);
 	while(!desc->entry->eof) {
 		res = readdir_search_pagecache(desc);
 
@@ -592,6 +593,7 @@ static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 			break;
 		}
 	}
+	nfs_unblock_sillyrename(dentry);
 	unlock_kernel();
 	if (res > 0)
 		res = 0;
@@ -866,6 +868,7 @@ struct dentry_operations nfs_dentry_operations = {
 static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
 {
 	struct dentry *res;
+	struct dentry *parent;
 	struct inode *inode = NULL;
 	int error;
 	struct nfs_fh fhandle;
@@ -894,26 +897,31 @@ static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, stru
 		goto out_unlock;
 	}
 
+	parent = dentry->d_parent;
+	/* Protect against concurrent sillydeletes */
+	nfs_block_sillyrename(parent);
 	error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr);
 	if (error == -ENOENT)
 		goto no_entry;
 	if (error < 0) {
 		res = ERR_PTR(error);
-		goto out_unlock;
+		goto out_unblock_sillyrename;
 	}
 	inode = nfs_fhget(dentry->d_sb, &fhandle, &fattr);
 	res = (struct dentry *)inode;
 	if (IS_ERR(res))
-		goto out_unlock;
+		goto out_unblock_sillyrename;
 
 no_entry:
 	res = d_materialise_unique(dentry, inode);
 	if (res != NULL) {
 		if (IS_ERR(res))
-			goto out_unlock;
+			goto out_unblock_sillyrename;
 		dentry = res;
 	}
 	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
+out_unblock_sillyrename:
+	nfs_unblock_sillyrename(parent);
 out_unlock:
 	unlock_kernel();
 out:
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index d29f90d..b3bb89f 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -131,7 +131,7 @@ nfs_file_release(struct inode *inode, struct file *filp)
 {
 	/* Ensure that dirty pages are flushed out with the right creds */
 	if (filp->f_mode & FMODE_WRITE)
-		filemap_fdatawrite(filp->f_mapping);
+		nfs_wb_all(filp->f_path.dentry->d_inode);
 	nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
 	return NFS_PROTO(inode)->file_release(inode, filp);
 }
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 6d2f2a3..db5d96d 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -514,7 +514,7 @@ struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
 	return ctx;
 }
 
-void put_nfs_open_context(struct nfs_open_context *ctx)
+static void __put_nfs_open_context(struct nfs_open_context *ctx, int wait)
 {
 	struct inode *inode = ctx->path.dentry->d_inode;
 
@@ -522,8 +522,12 @@ void put_nfs_open_context(struct nfs_open_context *ctx)
 		return;
 	list_del(&ctx->list);
 	spin_unlock(&inode->i_lock);
-	if (ctx->state != NULL)
-		nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
+	if (ctx->state != NULL) {
+		if (wait)
+			nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
+		else
+			nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
+	}
 	if (ctx->cred != NULL)
 		put_rpccred(ctx->cred);
 	dput(ctx->path.dentry);
@@ -531,6 +535,16 @@ void put_nfs_open_context(struct nfs_open_context *ctx)
 	kfree(ctx);
 }
 
+void put_nfs_open_context(struct nfs_open_context *ctx)
+{
+	__put_nfs_open_context(ctx, 0);
+}
+
+static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
+{
+	__put_nfs_open_context(ctx, 1);
+}
+
 /*
  * Ensure that mmap has a recent RPC credential for use when writing out
  * shared pages
@@ -577,7 +591,7 @@ static void nfs_file_clear_open_context(struct file *filp)
 		spin_lock(&inode->i_lock);
 		list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
 		spin_unlock(&inode->i_lock);
-		put_nfs_open_context(ctx);
+		put_nfs_open_context_sync(ctx);
 	}
 }
 
@@ -1169,6 +1183,9 @@ static void init_once(struct kmem_cache * cachep, void *foo)
 	INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
 	nfsi->ncommit = 0;
 	nfsi->npages = 0;
+	atomic_set(&nfsi->silly_count, 1);
+	INIT_HLIST_HEAD(&nfsi->silly_list);
+	init_waitqueue_head(&nfsi->waitqueue);
 	nfs4_init_once(nfsi);
 }
 
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index d2802b1..a4e3b96 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -178,7 +178,7 @@ extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struc
 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct rpc_cred *);
 extern int nfs4_proc_async_renew(struct nfs_client *, struct rpc_cred *);
 extern int nfs4_proc_renew(struct nfs_client *, struct rpc_cred *);
-extern int nfs4_do_close(struct path *path, struct nfs4_state *state);
+extern int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait);
 extern struct dentry *nfs4_atomic_open(struct inode *, struct dentry *, struct nameidata *);
 extern int nfs4_open_revalidate(struct inode *, struct dentry *, int, struct nameidata *);
 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
@@ -209,6 +209,7 @@ extern void nfs4_drop_state_owner(struct nfs4_state_owner *);
 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 extern void nfs4_put_open_state(struct nfs4_state *);
 extern void nfs4_close_state(struct path *, struct nfs4_state *, mode_t);
+extern void nfs4_close_sync(struct path *, struct nfs4_state *, mode_t);
 extern void nfs4_state_set_mode_locked(struct nfs4_state *, mode_t);
 extern void nfs4_schedule_state_recovery(struct nfs_client *);
 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index cb99fd9..f03d9d5 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1305,7 +1305,7 @@ static const struct rpc_call_ops nfs4_close_ops = {
  *
  * NOTE: Caller must be holding the sp->so_owner semaphore!
  */
-int nfs4_do_close(struct path *path, struct nfs4_state *state)
+int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
 {
 	struct nfs_server *server = NFS_SERVER(state->inode);
 	struct nfs4_closedata *calldata;
@@ -1333,8 +1333,11 @@ int nfs4_do_close(struct path *path, struct nfs4_state *state)
 	task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
 	if (IS_ERR(task))
 		return PTR_ERR(task);
+	status = 0;
+	if (wait)
+		status = rpc_wait_for_completion_task(task);
 	rpc_put_task(task);
-	return 0;
+	return status;
 out_free_calldata:
 	kfree(calldata);
 out:
@@ -1365,13 +1368,14 @@ static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct
 	}
 	ret = PTR_ERR(filp);
 out_close:
-	nfs4_close_state(path, state, nd->intent.open.flags);
+	nfs4_close_sync(path, state, nd->intent.open.flags);
 	return ret;
 }
 
 struct dentry *
 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
 {
+	struct dentry *parent;
 	struct path path = {
 		.mnt = nd->mnt,
 		.dentry = dentry,
@@ -1394,6 +1398,9 @@ nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
 	cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
 	if (IS_ERR(cred))
 		return (struct dentry *)cred;
+	parent = dentry->d_parent;
+	/* Protect against concurrent sillydeletes */
+	nfs_block_sillyrename(parent);
 	state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
 	put_rpccred(cred);
 	if (IS_ERR(state)) {
@@ -1401,12 +1408,14 @@ nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
 			d_add(dentry, NULL);
 			nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 		}
+		nfs_unblock_sillyrename(parent);
 		return (struct dentry *)state;
 	}
 	res = d_add_unique(dentry, igrab(state->inode));
 	if (res != NULL)
 		path.dentry = res;
 	nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
+	nfs_unblock_sillyrename(parent);
 	nfs4_intent_set_file(nd, &path, state);
 	return res;
 }
@@ -1444,7 +1453,7 @@ nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, st
 		nfs4_intent_set_file(nd, &path, state);
 		return 1;
 	}
-	nfs4_close_state(&path, state, openflags);
+	nfs4_close_sync(&path, state, openflags);
 out_drop:
 	d_drop(dentry);
 	return 0;
@@ -1898,7 +1907,7 @@ nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 	if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
 		status = nfs4_intent_set_file(nd, &path, state);
 	else
-		nfs4_close_state(&path, state, flags);
+		nfs4_close_sync(&path, state, flags);
 out:
 	return status;
 }
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index bfb3626..23a9a36 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -425,7 +425,7 @@ void nfs4_put_open_state(struct nfs4_state *state)
 /*
  * Close the current file.
  */
-void nfs4_close_state(struct path *path, struct nfs4_state *state, mode_t mode)
+static void __nfs4_close(struct path *path, struct nfs4_state *state, mode_t mode, int wait)
 {
 	struct nfs4_state_owner *owner = state->owner;
 	int call_close = 0;
@@ -466,7 +466,17 @@ void nfs4_close_state(struct path *path, struct nfs4_state *state, mode_t mode)
 		nfs4_put_open_state(state);
 		nfs4_put_state_owner(owner);
 	} else
-		nfs4_do_close(path, state);
+		nfs4_do_close(path, state, wait);
+}
+
+void nfs4_close_state(struct path *path, struct nfs4_state *state, mode_t mode)
+{
+	__nfs4_close(path, state, mode, 0);
+}
+
+void nfs4_close_sync(struct path *path, struct nfs4_state *state, mode_t mode)
+{
+	__nfs4_close(path, state, mode, 1);
 }
 
 /*
diff --git a/fs/nfs/unlink.c b/fs/nfs/unlink.c
index 1aed850..6ecd46c 100644
--- a/fs/nfs/unlink.c
+++ b/fs/nfs/unlink.c
@@ -14,6 +14,7 @@
 
 
 struct nfs_unlinkdata {
+	struct hlist_node list;
 	struct nfs_removeargs args;
 	struct nfs_removeres res;
 	struct inode *dir;
@@ -52,6 +53,20 @@ static int nfs_copy_dname(struct dentry *dentry, struct nfs_unlinkdata *data)
 	return 0;
 }
 
+static void nfs_free_dname(struct nfs_unlinkdata *data)
+{
+	kfree(data->args.name.name);
+	data->args.name.name = NULL;
+	data->args.name.len = 0;
+}
+
+static void nfs_dec_sillycount(struct inode *dir)
+{
+	struct nfs_inode *nfsi = NFS_I(dir);
+	if (atomic_dec_return(&nfsi->silly_count) == 1)
+		wake_up(&nfsi->waitqueue);
+}
+
 /**
  * nfs_async_unlink_init - Initialize the RPC info
  * task: rpc_task of the sillydelete
@@ -95,6 +110,8 @@ static void nfs_async_unlink_done(struct rpc_task *task, void *calldata)
 static void nfs_async_unlink_release(void *calldata)
 {
 	struct nfs_unlinkdata	*data = calldata;
+
+	nfs_dec_sillycount(data->dir);
 	nfs_free_unlinkdata(data);
 }
 
@@ -104,33 +121,100 @@ static const struct rpc_call_ops nfs_unlink_ops = {
 	.rpc_release = nfs_async_unlink_release,
 };
 
-static int nfs_call_unlink(struct dentry *dentry, struct nfs_unlinkdata *data)
+static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct nfs_unlinkdata *data)
 {
 	struct rpc_task *task;
+	struct dentry *alias;
+
+	alias = d_lookup(parent, &data->args.name);
+	if (alias != NULL) {
+		int ret = 0;
+		/*
+		 * Hey, we raced with lookup... See if we need to transfer
+		 * the sillyrename information to the aliased dentry.
+		 */
+		nfs_free_dname(data);
+		spin_lock(&alias->d_lock);
+		if (!(alias->d_flags & DCACHE_NFSFS_RENAMED)) {
+			alias->d_fsdata = data;
+			alias->d_flags ^= DCACHE_NFSFS_RENAMED;
+			ret = 1;
+		}
+		spin_unlock(&alias->d_lock);
+		nfs_dec_sillycount(dir);
+		dput(alias);
+		return ret;
+	}
+	data->dir = igrab(dir);
+	if (!data->dir) {
+		nfs_dec_sillycount(dir);
+		return 0;
+	}
+	data->args.fh = NFS_FH(dir);
+	nfs_fattr_init(&data->res.dir_attr);
+
+	task = rpc_run_task(NFS_CLIENT(dir), RPC_TASK_ASYNC, &nfs_unlink_ops, data);
+	if (!IS_ERR(task))
+		rpc_put_task(task);
+	return 1;
+}
+
+static int nfs_call_unlink(struct dentry *dentry, struct nfs_unlinkdata *data)
+{
 	struct dentry *parent;
 	struct inode *dir;
+	int ret = 0;
 
-	if (nfs_copy_dname(dentry, data) < 0)
-		goto out_free;
 
 	parent = dget_parent(dentry);
 	if (parent == NULL)
 		goto out_free;
-	dir = igrab(parent->d_inode);
+	dir = parent->d_inode;
+	if (nfs_copy_dname(dentry, data) == 0)
+		goto out_dput;
+	/* Non-exclusive lock protects against concurrent lookup() calls */
+	spin_lock(&dir->i_lock);
+	if (atomic_inc_not_zero(&NFS_I(dir)->silly_count) == 0) {
+		/* Deferred delete */
+		hlist_add_head(&data->list, &NFS_I(dir)->silly_list);
+		spin_unlock(&dir->i_lock);
+		ret = 1;
+		goto out_dput;
+	}
+	spin_unlock(&dir->i_lock);
+	ret = nfs_do_call_unlink(parent, dir, data);
+out_dput:
 	dput(parent);
-	if (dir == NULL)
-		goto out_free;
+out_free:
+	return ret;
+}
 
-	data->dir = dir;
-	data->args.fh = NFS_FH(dir);
-	nfs_fattr_init(&data->res.dir_attr);
+void nfs_block_sillyrename(struct dentry *dentry)
+{
+	struct nfs_inode *nfsi = NFS_I(dentry->d_inode);
 
-	task = rpc_run_task(NFS_CLIENT(dir), RPC_TASK_ASYNC, &nfs_unlink_ops, data);
-	if (!IS_ERR(task))
-		rpc_put_task(task);
-	return 1;
-out_free:
-	return 0;
+	wait_event(nfsi->waitqueue, atomic_cmpxchg(&nfsi->silly_count, 1, 0) == 1);
+}
+
+void nfs_unblock_sillyrename(struct dentry *dentry)
+{
+	struct inode *dir = dentry->d_inode;
+	struct nfs_inode *nfsi = NFS_I(dir);
+	struct nfs_unlinkdata *data;
+
+	atomic_inc(&nfsi->silly_count);
+	spin_lock(&dir->i_lock);
+	while (!hlist_empty(&nfsi->silly_list)) {
+		if (!atomic_inc_not_zero(&nfsi->silly_count))
+			break;
+		data = hlist_entry(nfsi->silly_list.first, struct nfs_unlinkdata, list);
+		hlist_del(&data->list);
+		spin_unlock(&dir->i_lock);
+		if (nfs_do_call_unlink(dentry, dir, data) == 0)
+			nfs_free_unlinkdata(data);
+		spin_lock(&dir->i_lock);
+	}
+	spin_unlock(&dir->i_lock);
 }
 
 /**
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 0cf9d1c..89527a4 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -174,8 +174,6 @@ static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int
 		return;
 	if (count != nfs_page_length(page))
 		return;
-	if (count != PAGE_CACHE_SIZE)
-		zero_user_page(page, count, PAGE_CACHE_SIZE - count, KM_USER0);
 	SetPageUptodate(page);
 }
 
@@ -627,7 +625,8 @@ static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx,
 				return ERR_PTR(error);
 			}
 			spin_unlock(&inode->i_lock);
-			return new;
+			req = new;
+			goto zero_page;
 		}
 		spin_unlock(&inode->i_lock);
 
@@ -655,13 +654,23 @@ static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx,
 	if (offset < req->wb_offset) {
 		req->wb_offset = offset;
 		req->wb_pgbase = offset;
-		req->wb_bytes = rqend - req->wb_offset;
+		req->wb_bytes = max(end, rqend) - req->wb_offset;
+		goto zero_page;
 	}
 
 	if (end > rqend)
 		req->wb_bytes = end - req->wb_offset;
 
 	return req;
+zero_page:
+	/* If this page might potentially be marked as up to date,
+	 * then we need to zero any uninitalised data. */
+	if (req->wb_pgbase == 0 && req->wb_bytes != PAGE_CACHE_SIZE
+			&& !PageUptodate(req->wb_page))
+		zero_user_page(req->wb_page, req->wb_bytes,
+				PAGE_CACHE_SIZE - req->wb_bytes,
+				KM_USER0);
+	return req;
 }
 
 int nfs_flush_incompatible(struct file *file, struct page *page)