[PATCH 4.19 134/175] fs: add a vfs_fchown helper

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4.19-stable review patch.  If anyone has any objections, please let me know.

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

From: Christoph Hellwig <hch@xxxxxx>

[ Upstream commit c04011fe8cbd80af1be6e12b53193bf3846750d7 ]

Add a helper for struct file based chown operations.  To be used by
the initramfs code soon.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Acked-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Stable-dep-of: 4624b346cf67 ("init: open /initrd.image with O_LARGEFILE")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/open.c          | 29 +++++++++++++++++------------
 include/linux/fs.h |  2 ++
 2 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/fs/open.c b/fs/open.c
index 76996f920ebf5..e072e86003f56 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -707,23 +707,28 @@ SYSCALL_DEFINE3(lchown, const char __user *, filename, uid_t, user, gid_t, group
 			   AT_SYMLINK_NOFOLLOW);
 }
 
+int vfs_fchown(struct file *file, uid_t user, gid_t group)
+{
+	int error;
+
+	error = mnt_want_write_file(file);
+	if (error)
+		return error;
+	audit_file(file);
+	error = chown_common(&file->f_path, user, group);
+	mnt_drop_write_file(file);
+	return error;
+}
+
 int ksys_fchown(unsigned int fd, uid_t user, gid_t group)
 {
 	struct fd f = fdget(fd);
 	int error = -EBADF;
 
-	if (!f.file)
-		goto out;
-
-	error = mnt_want_write_file(f.file);
-	if (error)
-		goto out_fput;
-	audit_file(f.file);
-	error = chown_common(&f.file->f_path, user, group);
-	mnt_drop_write_file(f.file);
-out_fput:
-	fdput(f);
-out:
+	if (f.file) {
+		error = vfs_fchown(f.file, user, group);
+		fdput(f);
+	}
 	return error;
 }
 
diff --git a/include/linux/fs.h b/include/linux/fs.h
index e2c87c056742c..7d93d22ad1062 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1660,6 +1660,8 @@ int vfs_mkobj(struct dentry *, umode_t,
 		int (*f)(struct dentry *, umode_t, void *),
 		void *);
 
+int vfs_fchown(struct file *file, uid_t user, gid_t group);
+
 extern long vfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 
 /*
-- 
2.43.0







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