Commit 525bab71 authored by Ezequiel Garcia's avatar Ezequiel Garcia Committed by Richard Weinberger
Browse files

UBI: Add ro-mode sysfs attribute 



On serious situations, UBI may detect serious device corruption,
and switch to read-only mode to protect the data and allow debugging.
This commit exposes this ro-mode on sysfs, so it can be obtained
by userspace tools.

Signed-off-by: default avatarEzequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent 04974df8

Documentation/ABI/stable/sysfs-class-ubi

+9 −0
Original line number Diff line number Diff line
@@ -107,6 +107,15 @@ Contact: Artem Bityutskiy <dedekind@infradead.org> 
Description:

		Number of physical eraseblocks reserved for bad block handling.



What:		/sys/class/ubi/ubiX/ro_mode

Date:		April 2016

KernelVersion:	4.7

Contact:	linux-mtd@lists.infradead.org

Description:

		Contains ASCII "1\n" if the read-only flag is set on this

		device, and "0\n" if it is cleared. UBI devices mark themselves

		as read-only when they detect an unrecoverable error.



What:		/sys/class/ubi/ubiX/total_eraseblocks

Date:		July 2006

KernelVersion:	2.6.22

drivers/mtd/ubi/build.c

+5 −0
Original line number Diff line number Diff line
@@ -149,6 +149,8 @@ static struct device_attribute dev_bgt_enabled = 
	__ATTR(bgt_enabled, S_IRUGO, dev_attribute_show, NULL);

static struct device_attribute dev_mtd_num =

	__ATTR(mtd_num, S_IRUGO, dev_attribute_show, NULL);

static struct device_attribute dev_ro_mode =

	__ATTR(ro_mode, S_IRUGO, dev_attribute_show, NULL);



/**

 * ubi_volume_notify - send a volume change notification.
@@ -385,6 +387,8 @@ static ssize_t dev_attribute_show(struct device *dev, 
		ret = sprintf(buf, "%d\n", ubi->thread_enabled);

	else if (attr == &dev_mtd_num)

		ret = sprintf(buf, "%d\n", ubi->mtd->index);

	else if (attr == &dev_ro_mode)

		ret = sprintf(buf, "%d\n", ubi->ro_mode);

	else

		ret = -EINVAL;
@@ -404,6 +408,7 @@ static struct attribute *ubi_dev_attrs[] = { 
	&dev_min_io_size.attr,

	&dev_bgt_enabled.attr,

	&dev_mtd_num.attr,

	&dev_ro_mode.attr,

	NULL

};

ATTRIBUTE_GROUPS(ubi_dev);

CRA Git | Maintained and supported by SUSTech CRA and CCSE