mirror of https://github.com/OpenIPC/firmware.git
93 lines
2.5 KiB
Diff
93 lines
2.5 KiB
Diff
diff -drupN a/fs/sdcardfs/mmap.c b/fs/sdcardfs/mmap.c
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--- a/fs/sdcardfs/mmap.c 1970-01-01 03:00:00.000000000 +0300
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+++ b/fs/sdcardfs/mmap.c 2022-06-12 05:28:14.000000000 +0300
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@@ -0,0 +1,88 @@
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+/*
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+ * fs/sdcardfs/mmap.c
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+ *
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+ * Copyright (c) 2013 Samsung Electronics Co. Ltd
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+ * Authors: Daeho Jeong, Woojoong Lee, Seunghwan Hyun,
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+ * Sunghwan Yun, Sungjong Seo
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+ *
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+ * This program has been developed as a stackable file system based on
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+ * the WrapFS which written by
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+ *
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+ * Copyright (c) 1998-2011 Erez Zadok
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+ * Copyright (c) 2009 Shrikar Archak
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+ * Copyright (c) 2003-2011 Stony Brook University
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+ * Copyright (c) 2003-2011 The Research Foundation of SUNY
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+ *
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+ * This file is dual licensed. It may be redistributed and/or modified
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+ * under the terms of the Apache 2.0 License OR version 2 of the GNU
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+ * General Public License.
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+ */
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+
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+#include "sdcardfs.h"
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+
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+static int sdcardfs_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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+{
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+ int err;
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+ struct file *file;
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+ const struct vm_operations_struct *lower_vm_ops;
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+
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+ file = (struct file *)vma->vm_private_data;
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+ lower_vm_ops = SDCARDFS_F(file)->lower_vm_ops;
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+ BUG_ON(!lower_vm_ops);
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+
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+ err = lower_vm_ops->fault(vma, vmf);
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+ return err;
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+}
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+
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+static void sdcardfs_vm_open(struct vm_area_struct *vma)
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+{
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+ struct file *file = (struct file *)vma->vm_private_data;
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+
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+ get_file(file);
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+}
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+
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+static void sdcardfs_vm_close(struct vm_area_struct *vma)
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+{
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+ struct file *file = (struct file *)vma->vm_private_data;
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+
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+ fput(file);
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+}
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+
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+static int sdcardfs_page_mkwrite(struct vm_area_struct *vma,
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+ struct vm_fault *vmf)
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+{
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+ int err = 0;
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+ struct file *file;
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+ const struct vm_operations_struct *lower_vm_ops;
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+
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+ file = (struct file *)vma->vm_private_data;
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+ lower_vm_ops = SDCARDFS_F(file)->lower_vm_ops;
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+ BUG_ON(!lower_vm_ops);
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+ if (!lower_vm_ops->page_mkwrite)
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+ goto out;
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+
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+ err = lower_vm_ops->page_mkwrite(vma, vmf);
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+out:
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+ return err;
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+}
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+
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+static ssize_t sdcardfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
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+{
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+ /*
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+ * This function should never be called directly. We need it
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+ * to exist, to get past a check in open_check_o_direct(),
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+ * which is called from do_last().
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+ */
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+ return -EINVAL;
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+}
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+
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+const struct address_space_operations sdcardfs_aops = {
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+ .direct_IO = sdcardfs_direct_IO,
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+};
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+
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+const struct vm_operations_struct sdcardfs_vm_ops = {
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+ .fault = sdcardfs_fault,
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+ .page_mkwrite = sdcardfs_page_mkwrite,
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+ .open = sdcardfs_vm_open,
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+ .close = sdcardfs_vm_close,
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+};
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