file: Rename __close_fd_get_file close_fd_get_file

mainline inclusion
from mainline-v5.11-rc1
commit 9fe83c43
category: bugfix
bugzilla: 188963, https://gitee.com/src-openeuler/kernel/issues/I7GUAN
CVE: NA

--------------------------------

The function close_fd_get_file is explicitly a variant of
__close_fd[1].  Now that __close_fd has been renamed close_fd, rename
close_fd_get_file to be consistent with close_fd.

When __alloc_fd, __close_fd and __fd_install were introduced the
double underscore indicated that the function took a struct
files_struct parameter.  The function __close_fd_get_file never has so
the naming has always been inconsistent.  This just cleans things up
so there are not any lingering mentions or references __close_fd left
in the code.

[1] 80cd7956 ("binder: fix use-after-free due to ksys_close() during fdget()")
Link: https://lkml.kernel.org/r/20201120231441.29911-23-ebiederm@xmission.comSigned-off-by: NEric W. Biederman <ebiederm@xmission.com>

Conflicts:
	drivers/android/binder.c
	fs/file.c
	fs/io_uring.c
	include/linux/fdtable.h
Signed-off-by: NLi Nan <linan122@huawei.com>
Reviewed-by: NYang Erkun <yangerkun@huawei.com>
Reviewed-by: NWang Weiyang <wangweiyang2@huawei.com>
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>

drivers/android/binder.c

@@ -2290,7 +2290,7 @@ static void binder_deferred_fd_close(int fd)
 	if (!twcb)
 		return;
 	init_task_work(&twcb->twork, binder_do_fd_close);
-	__close_fd_get_file(fd, &twcb->file);
+	close_fd_get_file(fd, &twcb->file);
 	if (twcb->file) {
 		filp_close(twcb->file, current->files);
 		task_work_add(current, &twcb->twork, true);

fs/file.c

@@ -696,11 +696,11 @@ int __close_fd(struct files_struct *files, unsigned fd)
 EXPORT_SYMBOL(__close_fd); /* for ksys_close() */
 
 /*
- * variant of __close_fd that gets a ref on the file for later fput.
+ * variant of close_fd that gets a ref on the file for later fput.
  * The caller must ensure that filp_close() called on the file, and then
  * an fput().
  */
-int __close_fd_get_file(unsigned int fd, struct file **res)
+int close_fd_get_file(unsigned int fd, struct file **res)
 {
 	struct files_struct *files = current->files;
 	struct file *file;

fs/io_uring.c

@@ -3885,7 +3885,7 @@ static int io_close(struct io_kiocb *req, bool force_nonblock,
 
 	/* might be already done during nonblock submission */
 	if (!close->put_file) {
-		ret = __close_fd_get_file(close->fd, &close->put_file);
+		ret = close_fd_get_file(close->fd, &close->put_file);
 		if (ret < 0)
 			return (ret == -ENOENT) ? -EBADF : ret;
 	}

include/linux/fdtable.h

@@ -122,7 +122,7 @@ extern void __fd_install(struct files_struct *files,
 		      unsigned int fd, struct file *file);
 extern int __close_fd(struct files_struct *files,
 		      unsigned int fd);
-extern int __close_fd_get_file(unsigned int fd, struct file **res);
+extern int close_fd_get_file(unsigned int fd, struct file **res);
 
 extern struct kmem_cache *files_cachep;