[PATCH v2 20/24] file: Merge __alloc_fd into alloc_fd

["Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>]

The function __alloc_fd was added to support binder[1].  With binder
fixed[2] there are no more users.

As alloc_fd just calls __alloc_fd with "files=current->files",
merge them together by transforming the files parameter into a
local variable initialized to current->files.

[1] dcfadfa4ec5a ("new helper: __alloc_fd()")
[2] 44d8047f1d87 ("binder: use standard functions to allocate fds")
Acked-by: Christian Brauner <christian.brauner@xxxxxxxxxx>
v1: https://lkml.kernel.org/r/20200817220425.9389-16-ebiederm@xxxxxxxxxxxx
Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
---
 fs/file.c               | 11 +++--------
 include/linux/fdtable.h |  2 --
 2 files changed, 3 insertions(+), 10 deletions(-)

diff --git a/fs/file.c b/fs/file.c
index 07e25f1b9dfd..621563701bd9 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -480,9 +480,9 @@ static unsigned int find_next_fd(struct fdtable *fdt, unsigned int start)
 /*
  * allocate a file descriptor, mark it busy.
  */
-int __alloc_fd(struct files_struct *files,
-	       unsigned start, unsigned end, unsigned flags)
+static int alloc_fd(unsigned start, unsigned end, unsigned flags)
 {
+	struct files_struct *files = current->files;
 	unsigned int fd;
 	int error;
 	struct fdtable *fdt;
@@ -538,14 +538,9 @@ int __alloc_fd(struct files_struct *files,
 	return error;
 }
 
-static int alloc_fd(unsigned start, unsigned end, unsigned flags)
-{
-	return __alloc_fd(current->files, start, end, flags);
-}
-
 int __get_unused_fd_flags(unsigned flags, unsigned long nofile)
 {
-	return __alloc_fd(current->files, 0, nofile, flags);
+	return alloc_fd(0, nofile, flags);
 }
 
 int get_unused_fd_flags(unsigned flags)
diff --git a/include/linux/fdtable.h b/include/linux/fdtable.h
index a5ec736d74a5..dc476ae92f56 100644
--- a/include/linux/fdtable.h
+++ b/include/linux/fdtable.h
@@ -124,8 +124,6 @@ int iterate_fd(struct files_struct *, unsigned,
 		int (*)(const void *, struct file *, unsigned),
 		const void *);
 
-extern int __alloc_fd(struct files_struct *files,
-		      unsigned start, unsigned end, unsigned flags);
 extern int __close_fd(struct files_struct *files,
 		      unsigned int fd);
 extern int __close_range(unsigned int fd, unsigned int max_fd, unsigned int flags);
-- 
2.25.0