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drivers: soc: rename block device nodes

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Rename block driver enables the renaming of block dev
nodes assigned by generic driver.

Change-Id: I40f966717683efb9800dcb34ed851f95cb22e3c8
Signed-off-by: Venkata Rao Kakani <vkakani@codeaurora.org>
This commit is contained in:
Venkata Rao Kakani 2021-01-27 19:56:05 +05:30
commit 9330da939c
3 changed files with 68 additions and 0 deletions
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9
drivers/soc/qcom/Kconfig
View file

@ -1156,5 +1156,14 @@ config QCOM_RTIC
will trigger RTIC kernel MP.s (measurement parameters) generation
during the kernel build.
config RENAME_BLOCK_DEVICE
tristate "Rename block device node in /dev"
default n
help
Say 'Y' to to rename the block device node assigned by generic
driver to a name that is needed. This is used for rename block
device names created by default as sda1, sda2 etc. to the
names system is needed.this is applicable for block devices only.
source "drivers/soc/qcom/icnss2/Kconfig"
endmenu

1
drivers/soc/qcom/Makefile
View file

@ -104,3 +104,4 @@ obj-$(CONFIG_QTI_HW_MEMLAT_SCMI_CLIENT) += memlat_scmi.o
obj-$(CONFIG_QTI_HW_MEMLAT) += rimps_memlat.o
obj-$(CONFIG_QTI_HW_MEMLAT_LOG) += rimps_log.o
obj-$(CONFIG_QCOM_QFPROM_SYS) += qfprom-sys.o
obj-$(CONFIG_RENAME_BLOCK_DEVICE) += rename_block_device.o

58
drivers/soc/qcom/rename_block_device.c Normal file
View file

@ -0,0 +1,58 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2021, The Linux Foundation. All rights reserved.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/genhd.h>
#include <linux/device.h>
#include <linux/of.h>
#define PATH_SIZE 32
static int rename_blk_dev_init(void)
{
dev_t dev;
int index = 0, partno;
struct gendisk *disk;
struct device_node *node;
char dev_path[PATH_SIZE];
const char *actual_name, *modified_name;
node = of_find_compatible_node(NULL, NULL, "qcom,blkdev-rename");
if (!node) {
pr_err("qcom,blkdev-rename is missing\n");
goto out;
}
while (!of_property_read_string_index(node, "actual-dev", index,
&actual_name)) {
memset(dev_path, '\0', PATH_SIZE);
snprintf(dev_path, PATH_SIZE, "/dev/%s", actual_name);
dev = name_to_dev_t(dev_path);
if (!dev) {
pr_err("No device path : %s\n", dev_path);
return -EINVAL;
}
disk = get_gendisk(dev, &partno);
if (!disk) {
pr_err("No device with dev path : %s\n", dev_path);
return -ENXIO;
}
if (!of_property_read_string_index(node, "rename-dev", index,
&modified_name)) {
device_rename(disk_to_dev(disk), modified_name);
} else {
pr_err("rename-dev for actual-dev = %s is missing\n",
actual_name);
return -ENXIO;
}
index++;
}
out:
return 0;
}
late_initcall(rename_blk_dev_init);
MODULE_DESCRIPTION("Rename block devices");
MODULE_LICENSE("GPL v2");