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65 lines
1.8 KiB
65 lines
1.8 KiB
/* Copyright (c) 2020 The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mount.h>
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#include <linux/genhd.h>
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#include <linux/device.h>
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#include <linux/of.h>
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#define PATH_SIZE 32
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static int rename_blk_dev_init(void)
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{
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dev_t dev;
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int index = 0, partno;
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struct gendisk *disk;
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struct device_node *node;
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char dev_path[PATH_SIZE];
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const char *actual_name, *modified_name;
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node = of_find_compatible_node(NULL, NULL, "qcom,blkdev-rename");
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if (!node) {
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pr_err("qcom,blkdev-rename is missing\n");
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goto out;
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}
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while (!of_property_read_string_index(node, "actual-dev", index,
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&actual_name)) {
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memset(dev_path, '\0', PATH_SIZE);
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snprintf(dev_path, PATH_SIZE, "/dev/%s", actual_name);
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dev = name_to_dev_t(dev_path);
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if (!dev) {
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pr_err("No device path : %s\n", dev_path);
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return -EINVAL;
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}
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disk = get_gendisk(dev, &partno);
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if (!disk) {
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pr_err("No device with dev path : %s\n", dev_path);
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return -ENXIO;
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}
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if (!of_property_read_string_index(node, "rename-dev", index,
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&modified_name)) {
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device_rename(disk_to_dev(disk), modified_name);
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} else {
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pr_err("rename-dev for actual-dev = %s is missing",
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actual_name);
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return -ENXIO;
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}
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index++;
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}
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out:
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return 0;
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}
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late_initcall(rename_blk_dev_init);
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MODULE_DESCRIPTION("Rename block devices");
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MODULE_LICENSE("GPL v2");
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