[PATCH 16/17] file: Merge __alloc_fd into alloc_fd

Eric W. Biederman
2020-08-17T22:13:00Z

The function __alloc_fd was added to support binder[1]. With binder
fixed[2] there are no more users. Further with get_files_struct
removed there can be no more users of __alloc_fd that pass anything
except current->files.

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

[1] dcfadfa4ec5a ("new helper: __alloc_fd()")
[2] 44d8047f1d87 ("binder: use standard functions to allocate fds")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
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 505b2e81ad3e..221fc4f97f61 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -465,9 +465,9 @@ 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;
@@ -523,14 +523,9 @@ 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 4da8aacc461a..d8f6c4921d85 100644
--- a/include/linux/fdtable.h
+++ b/include/linux/fdtable.h
@@ -116,8 +116,6 @@ 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