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Commit c2f18e9a authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Greg Kroah-Hartman
Browse files

fs: add a vfs_fchown helper 



[ Upstream commit c04011fe8cbd80af1be6e12b53193bf3846750d7 ]

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

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Stable-dep-of: 4624b346cf67 ("init: open /initrd.image with O_LARGEFILE")
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent a65f5dbf

fs/open.c

+17 −12
Original line number Diff line number Diff line
@@ -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:

	if (f.file) {

		error = vfs_fchown(f.file, user, group);

		fdput(f);

out:

	}

	return error;

}

include/linux/fs.h

+2 −0
Original line number Diff line number Diff line
@@ -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);



/*