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From:   "Eric W. Biederman" <ebiederm@xmission.com>
To:     linux-kernel@vger.kernel.org
Cc:     linux-fsdevel@vger.kernel.org, criu@openvz.org,
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        John Fastabend <john.fastabend@gmail.com>,
        KP Singh <kpsingh@chromium.org>,
        "Eric W. Biederman" <ebiederm@xmission.com>
Date:   Mon, 17 Aug 2020 17:04:24 -0500
Message-Id: <20200817220425.9389-16-ebiederm@xmission.com>
In-Reply-To: <87ft8l6ic3.fsf@x220.int.ebiederm.org>
References: <87ft8l6ic3.fsf@x220.int.ebiederm.org>
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Subject: [PATCH 16/17] file: Merge __alloc_fd into alloc_fd
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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