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UBI: Add ro-mode sysfs attribute

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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: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Ezequiel Garcia 2016-04-28 18:13:58 -03:00 committed by Richard Weinberger
parent 04974df804
commit 525bab71fe
2 changed files with 14 additions and 0 deletions
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9
Documentation/ABI/stable/sysfs-class-ubi
View File

@ -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

5
drivers/mtd/ubi/build.c
View File

@ -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);