ede7e59086
Supporting renaming of partitions in DP and NON DP Configurations. Change-Id: I1908d7e76157fa3e31378ea2981669379b2fca6b Signed-off-by: Venkata Rao Kakani <vkakani@codeaurora.org>
95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2021, The Linux Foundation. All rights reserved.
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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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#define SLOT_STR_LENGTH 3
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#define MAX_STR_SIZE 255
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static char active_slot[SLOT_STR_LENGTH];
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static char backup_slot[SLOT_STR_LENGTH];
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static int dp_enabled;
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static char final_name[MAX_STR_SIZE];
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static int __init set_slot_suffix(char *str)
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{
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if (str) {
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strlcpy(active_slot, str, SLOT_STR_LENGTH);
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strcmp(active_slot, "_a") ?
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strlcpy(backup_slot, "_a", SLOT_STR_LENGTH) :
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strlcpy(backup_slot, "_b", SLOT_STR_LENGTH);
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dp_enabled = 1;
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}
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return 1;
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}
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__setup("androidboot.slot_suffix=", set_slot_suffix);
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static void get_slot_updated_name(char *name)
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{
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int length = strlen(name);
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memset(final_name, '\0', MAX_STR_SIZE);
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strlcpy(final_name, name, MAX_STR_SIZE);
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if (dp_enabled && (final_name[length-2] == '_')) {
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if (final_name[length-1] == 'a')
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final_name[length-1] = active_slot[1];
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else if (final_name[length-1] == 'b')
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final_name[length-1] = backup_slot[1];
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}
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}
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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;
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char *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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goto out;
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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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goto out;
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}
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if (!of_property_read_string_index(node, dp_enabled ?
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"rename-dev-ab" : "rename-dev",
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index, (const char **)&modified_name)) {
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get_slot_updated_name(modified_name);
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device_rename(disk_to_dev(disk), final_name);
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} else {
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pr_err("rename-dev for actual-dev = %s is missing\n",
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actual_name);
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goto out;
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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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