ovl: support [S|G]ETFLAGS and FS[S|G]ETXATTR ioctls for directories

[S|G]ETFLAGS and FS[S|G]ETXATTR ioctls are applicable to both files and
directories, so add ioctl operations to dir as well.

We teach ovl_real_fdget() to get the realfile of directories which use
a different type of file->private_data.

Ifdef away compat ioctl implementation to conform to standard practice.

With this change, xfstest generic/079 which tests these ioctls on files
and directories passes.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/overlayfs/file.c

@@ -136,6 +136,13 @@ static int ovl_real_fdget_meta(const struct file *file, struct fd *real,
 
 static int ovl_real_fdget(const struct file *file, struct fd *real)
 {
+	if (d_is_dir(file_dentry(file))) {
+		real->flags = 0;
+		real->file = ovl_dir_real_file(file, false);
+
+		return PTR_ERR_OR_ZERO(real->file);
+	}
+
 	return ovl_real_fdget_meta(file, real, false);
 }
 
@@ -648,7 +655,7 @@ static long ovl_ioctl_set_fsxflags(struct file *file, unsigned int cmd,
 				   ovl_fsxflags_to_iflags(fa.fsx_xflags));
 }
 
-static long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	long ret;
 
@@ -673,8 +680,8 @@ static long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	return ret;
 }
 
-static long ovl_compat_ioctl(struct file *file, unsigned int cmd,
-			     unsigned long arg)
+#ifdef CONFIG_COMPAT
+long ovl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	switch (cmd) {
 	case FS_IOC32_GETFLAGS:
@@ -691,6 +698,7 @@ static long ovl_compat_ioctl(struct file *file, unsigned int cmd,
 
 	return ovl_ioctl(file, cmd, arg);
 }
+#endif
 
 enum ovl_copyop {
 	OVL_COPY,
@@ -792,7 +800,9 @@ const struct file_operations ovl_file_operations = {
 	.fallocate	= ovl_fallocate,
 	.fadvise	= ovl_fadvise,
 	.unlocked_ioctl	= ovl_ioctl,
+#ifdef CONFIG_COMPAT
 	.compat_ioctl	= ovl_compat_ioctl,
+#endif
 	.splice_read    = ovl_splice_read,
 	.splice_write   = ovl_splice_write,
 

fs/overlayfs/overlayfs.h

@@ -416,6 +416,7 @@ static inline int ovl_verify_upper(struct ovl_fs *ofs, struct dentry *index,
 
 /* readdir.c */
 extern const struct file_operations ovl_dir_operations;
+struct file *ovl_dir_real_file(const struct file *file, bool want_upper);
 int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list);
 void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list);
 void ovl_cache_free(struct list_head *list);
@@ -503,6 +504,8 @@ struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr);
 extern const struct file_operations ovl_file_operations;
 int __init ovl_aio_request_cache_init(void);
 void ovl_aio_request_cache_destroy(void);
+long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
+long ovl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 
 /* copy_up.c */
 int ovl_copy_up(struct dentry *dentry);

fs/overlayfs/readdir.c

@@ -840,7 +840,7 @@ out_unlock:
 	return res;
 }
 
-static struct file *ovl_dir_open_realfile(struct file *file,
+static struct file *ovl_dir_open_realfile(const struct file *file,
 					  struct path *realpath)
 {
 	struct file *res;
@@ -853,19 +853,22 @@ static struct file *ovl_dir_open_realfile(struct file *file,
 	return res;
 }
 
-static int ovl_dir_fsync(struct file *file, loff_t start, loff_t end,
-			 int datasync)
+/*
+ * Like ovl_real_fdget(), returns upperfile if dir was copied up since open.
+ * Unlike ovl_real_fdget(), this caches upperfile in file->private_data.
+ *
+ * TODO: use same abstract type for file->private_data of dir and file so
+ * upperfile could also be cached for files as well.
+ */
+struct file *ovl_dir_real_file(const struct file *file, bool want_upper)
 {
+
 	struct ovl_dir_file *od = file->private_data;
 	struct dentry *dentry = file->f_path.dentry;
 	struct file *realfile = od->realfile;
 
-	/* Nothing to sync for lower */
 	if (!OVL_TYPE_UPPER(ovl_path_type(dentry)))
-		return 0;
-
-	if (!ovl_should_sync(OVL_FS(dentry->d_sb)))
-		return 0;
+		return want_upper ? NULL : realfile;
 
 	/*
 	 * Need to check if we started out being a lower dir, but got copied up
@@ -884,7 +887,7 @@ static int ovl_dir_fsync(struct file *file, loff_t start, loff_t end,
 			if (!od->upperfile) {
 				if (IS_ERR(realfile)) {
 					inode_unlock(inode);
-					return PTR_ERR(realfile);
+					return realfile;
 				}
 				smp_store_release(&od->upperfile, realfile);
 			} else {
@@ -897,6 +900,25 @@ static int ovl_dir_fsync(struct file *file, loff_t start, loff_t end,
 		}
 	}
 
+	return realfile;
+}
+
+static int ovl_dir_fsync(struct file *file, loff_t start, loff_t end,
+			 int datasync)
+{
+	struct file *realfile;
+	int err;
+
+	if (!ovl_should_sync(OVL_FS(file->f_path.dentry->d_sb)))
+		return 0;
+
+	realfile = ovl_dir_real_file(file, true);
+	err = PTR_ERR_OR_ZERO(realfile);
+
+	/* Nothing to sync for lower */
+	if (!realfile || err)
+		return err;
+
 	return vfs_fsync_range(realfile, start, end, datasync);
 }
 
@@ -949,6 +971,10 @@ const struct file_operations ovl_dir_operations = {
 	.llseek		= ovl_dir_llseek,
 	.fsync		= ovl_dir_fsync,
 	.release	= ovl_dir_release,
+	.unlocked_ioctl	= ovl_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= ovl_compat_ioctl,
+#endif
 };
 
 int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list)