fold put_filp() into fput()

Just check FMODE_OPENED in __fput() and be done with that...
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/file_table.c

@@ -192,6 +192,9 @@ static void __fput(struct file *file)
 	struct vfsmount *mnt = file->f_path.mnt;
 	struct inode *inode = file->f_inode;
 
+	if (unlikely(!(file->f_mode & FMODE_OPENED)))
+		goto out;
+
 	might_sleep();
 
 	fsnotify_close(file);
@@ -221,12 +224,10 @@ static void __fput(struct file *file)
 		put_write_access(inode);
 		__mnt_drop_write(mnt);
 	}
-	file->f_path.dentry = NULL;
-	file->f_path.mnt = NULL;
-	file->f_inode = NULL;
-	file_free(file);
 	dput(dentry);
 	mntput(mnt);
+out:
+	file_free(file);
 }
 
 static LLIST_HEAD(delayed_fput_list);
@@ -301,12 +302,6 @@ void __fput_sync(struct file *file)
 
 EXPORT_SYMBOL(fput);
 
-void put_filp(struct file *file)
-{
-	if (atomic_long_dec_and_test(&file->f_count))
-		file_free(file);
-}
-
 void __init files_init(void)
 {
 	filp_cachep = kmem_cache_create("filp", sizeof(struct file), 0,

fs/namei.c

@@ -3531,7 +3531,7 @@ static struct file *path_openat(struct nameidata *nd,
 
 	s = path_init(nd, flags);
 	if (IS_ERR(s)) {
-		put_filp(file);
+		fput(file);
 		return ERR_CAST(s);
 	}
 	while (!(error = link_path_walk(s, nd)) &&
@@ -3547,7 +3547,7 @@ static struct file *path_openat(struct nameidata *nd,
 out2:
 	if (!(opened & FILE_OPENED)) {
 		BUG_ON(!error);
-		put_filp(file);
+		fput(file);
 	}
 	if (unlikely(error)) {
 		if (error == -EOPENSTALE) {

fs/open.c

@@ -921,17 +921,12 @@ struct file *dentry_open(const struct path *path, int flags,
 	f = alloc_empty_file(flags, cred);
 	if (!IS_ERR(f)) {
 		error = vfs_open(path, f);
-		if (!error) {
-			/* from now on we need fput() to dispose of f */
+		if (!error)
 			error = open_check_o_direct(f);
 		if (error) {
 			fput(f);
 			f = ERR_PTR(error);
 		}
-		} else { 
-			put_filp(f);
-			f = ERR_PTR(error);
-		}
 	}
 	return f;
 }

include/linux/file.h

@@ -78,7 +78,6 @@ extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);
 extern int replace_fd(unsigned fd, struct file *file, unsigned flags);
 extern void set_close_on_exec(unsigned int fd, int flag);
 extern bool get_close_on_exec(unsigned int fd);
-extern void put_filp(struct file *);
 extern int get_unused_fd_flags(unsigned flags);
 extern void put_unused_fd(unsigned int fd);