1 files changed, 33 insertions, 49 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 492cffd9d3d8..bc957487f6ec 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1532,7 +1532,8 @@ static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags)
 {
 	if (NFS_PROTO(dir)->version == 2)
 		return 0;
-	return flags & LOOKUP_EXCL;
+	return (flags & (LOOKUP_CREATE | LOOKUP_EXCL)) ==
+		(LOOKUP_CREATE | LOOKUP_EXCL);
 }
 
 /*
@@ -1672,7 +1673,7 @@ nfs_lookup_revalidate_delegated(struct inode *dir, struct dentry *dentry,
 	return nfs_lookup_revalidate_done(dir, dentry, inode, 1);
 }
 
-static int nfs_lookup_revalidate_dentry(struct inode *dir,
+static int nfs_lookup_revalidate_dentry(struct inode *dir, const struct qstr *name,
 					struct dentry *dentry,
 					struct inode *inode, unsigned int flags)
 {
@@ -1690,7 +1691,7 @@ static int nfs_lookup_revalidate_dentry(struct inode *dir,
 		goto out;
 
 	dir_verifier = nfs_save_change_attribute(dir);
-	ret = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr);
+	ret = NFS_PROTO(dir)->lookup(dir, dentry, name, fhandle, fattr);
 	if (ret < 0)
 		goto out;
 
@@ -1732,8 +1733,8 @@ out:
  * cached dentry and do a new lookup.
  */
 static int
-nfs_do_lookup_revalidate(struct inode *dir, struct dentry *dentry,
-			 unsigned int flags)
+nfs_do_lookup_revalidate(struct inode *dir, const struct qstr *name,
+			 struct dentry *dentry, unsigned int flags)
 {
 	struct inode *inode;
 	int error = 0;
@@ -1775,7 +1776,7 @@ nfs_do_lookup_revalidate(struct inode *dir, struct dentry *dentry,
 	if (NFS_STALE(inode))
 		goto out_bad;
 
-	return nfs_lookup_revalidate_dentry(dir, dentry, inode, flags);
+	return nfs_lookup_revalidate_dentry(dir, name, dentry, inode, flags);
 out_valid:
 	return nfs_lookup_revalidate_done(dir, dentry, inode, 1);
 out_bad:
@@ -1785,38 +1786,26 @@ out_bad:
 }
 
 static int
-__nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags,
-			int (*reval)(struct inode *, struct dentry *, unsigned int))
+__nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags)
 {
-	struct dentry *parent;
-	struct inode *dir;
-	int ret;
-
 	if (flags & LOOKUP_RCU) {
 		if (dentry->d_fsdata == NFS_FSDATA_BLOCKED)
 			return -ECHILD;
-		parent = READ_ONCE(dentry->d_parent);
-		dir = d_inode_rcu(parent);
-		if (!dir)
-			return -ECHILD;
-		ret = reval(dir, dentry, flags);
-		if (parent != READ_ONCE(dentry->d_parent))
-			return -ECHILD;
 	} else {
 		/* Wait for unlink to complete - see unblock_revalidate() */
 		wait_var_event(&dentry->d_fsdata,
 			       smp_load_acquire(&dentry->d_fsdata)
 			       != NFS_FSDATA_BLOCKED);
-		parent = dget_parent(dentry);
-		ret = reval(d_inode(parent), dentry, flags);
-		dput(parent);
 	}
-	return ret;
+	return 0;
 }
 
-static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags)
+static int nfs_lookup_revalidate(struct inode *dir, const struct qstr *name,
+				 struct dentry *dentry, unsigned int flags)
 {
-	return __nfs_lookup_revalidate(dentry, flags, nfs_do_lookup_revalidate);
+	if (__nfs_lookup_revalidate(dentry, flags))
+		return -ECHILD;
+	return nfs_do_lookup_revalidate(dir, name, dentry, flags);
 }
 
 static void block_revalidate(struct dentry *dentry)
@@ -1982,7 +1971,8 @@ struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned in
 
 	dir_verifier = nfs_save_change_attribute(dir);
 	trace_nfs_lookup_enter(dir, dentry, flags);
-	error = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr);
+	error = NFS_PROTO(dir)->lookup(dir, dentry, &dentry->d_name,
+				       fhandle, fattr);
 	if (error == -ENOENT) {
 		if (nfs_server_capable(dir, NFS_CAP_CASE_INSENSITIVE))
 			dir_verifier = inode_peek_iversion_raw(dir);
@@ -2025,7 +2015,8 @@ void nfs_d_prune_case_insensitive_aliases(struct inode *inode)
 EXPORT_SYMBOL_GPL(nfs_d_prune_case_insensitive_aliases);
 
 #if IS_ENABLED(CONFIG_NFS_V4)
-static int nfs4_lookup_revalidate(struct dentry *, unsigned int);
+static int nfs4_lookup_revalidate(struct inode *, const struct qstr *,
+				  struct dentry *, unsigned int);
 
 const struct dentry_operations nfs4_dentry_operations = {
 	.d_revalidate	= nfs4_lookup_revalidate,
@@ -2214,11 +2205,14 @@ no_open:
 EXPORT_SYMBOL_GPL(nfs_atomic_open);
 
 static int
-nfs4_do_lookup_revalidate(struct inode *dir, struct dentry *dentry,
-			  unsigned int flags)
+nfs4_lookup_revalidate(struct inode *dir, const struct qstr *name,
+		       struct dentry *dentry, unsigned int flags)
 {
 	struct inode *inode;
 
+	if (__nfs_lookup_revalidate(dentry, flags))
+		return -ECHILD;
+
 	trace_nfs_lookup_revalidate_enter(dir, dentry, flags);
 
 	if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY))
@@ -2254,16 +2248,10 @@ nfs4_do_lookup_revalidate(struct inode *dir, struct dentry *dentry,
 reval_dentry:
 	if (flags & LOOKUP_RCU)
 		return -ECHILD;
-	return nfs_lookup_revalidate_dentry(dir, dentry, inode, flags);
+	return nfs_lookup_revalidate_dentry(dir, name, dentry, inode, flags);
 
 full_reval:
-	return nfs_do_lookup_revalidate(dir, dentry, flags);
-}
-
-static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags)
-{
-	return __nfs_lookup_revalidate(dentry, flags,
-			nfs4_do_lookup_revalidate);
+	return nfs_do_lookup_revalidate(dir, name, dentry, flags);
 }
 
 #endif /* CONFIG_NFSV4 */
@@ -2319,7 +2307,8 @@ nfs_add_or_obtain(struct dentry *dentry, struct nfs_fh *fhandle,
 	d_drop(dentry);
 
 	if (fhandle->size == 0) {
-		error = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr);
+		error = NFS_PROTO(dir)->lookup(dir, dentry, &dentry->d_name,
+					       fhandle, fattr);
 		if (error)
 			goto out_error;
 	}
@@ -2433,11 +2422,11 @@ EXPORT_SYMBOL_GPL(nfs_mknod);
 /*
  * See comments for nfs_proc_create regarding failed operations.
  */
-int nfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
-	      struct dentry *dentry, umode_t mode)
+struct dentry *nfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
+			 struct dentry *dentry, umode_t mode)
 {
 	struct iattr attr;
-	int error;
+	struct dentry *ret;
 
 	dfprintk(VFS, "NFS: mkdir(%s/%lu), %pd\n",
 			dir->i_sb->s_id, dir->i_ino, dentry);
@@ -2446,14 +2435,9 @@ int nfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 	attr.ia_mode = mode | S_IFDIR;
 
 	trace_nfs_mkdir_enter(dir, dentry);
-	error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr);
-	trace_nfs_mkdir_exit(dir, dentry, error);
-	if (error != 0)
-		goto out_err;
-	return 0;
-out_err:
-	d_drop(dentry);
-	return error;
+	ret = NFS_PROTO(dir)->mkdir(dir, dentry, &attr);
+	trace_nfs_mkdir_exit(dir, dentry, PTR_ERR_OR_ZERO(ret));
+	return ret;
 }
 EXPORT_SYMBOL_GPL(nfs_mkdir);