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| author | Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> | 2016-04-29 00:13:58 +0300 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2016-05-24 16:15:26 +0300 |
| commit | 525bab71feb152bccb65054cc2bca1537e3bd2b5 (patch) | |
| tree | 877c83716fd81179bac97376dbede1a368cb51d8 | |
| parent | 04974df8049fc4240d22759a91e035082ccd18b4 (diff) | |
| download | linux-525bab71feb152bccb65054cc2bca1537e3bd2b5.tar.xz | |
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: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Richard Weinberger <richard@nod.at>
| -rw-r--r-- | Documentation/ABI/stable/sysfs-class-ubi | 9 | ||||
| -rw-r--r-- | drivers/mtd/ubi/build.c | 5 |
2 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-class-ubi b/Documentation/ABI/stable/sysfs-class-ubi index 18d471d9faea..a6b324014692 100644 --- a/Documentation/ABI/stable/sysfs-class-ubi +++ b/Documentation/ABI/stable/sysfs-class-ubi @@ -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 diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c index 22fd19c0c5d3..7091fca0fb44 100644 --- a/drivers/mtd/ubi/build.c +++ b/drivers/mtd/ubi/build.c @@ -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); |