Add a generic mechnism to notify the userspace about possible filesystem
corruption through sysfs entry (/sys/block/<bdev>/<part>/fs_unclean)
and uevent (KOBJ_CHANGE, uevent's environment variable FS_UNCLEAN=[0:1]).
To mark fs clean (e.g. after fs was fixed by userspace):
echo 0 > /sys/block/<bdev>/<part>/fs_unclean
(you will still receive uevent KOBJ_CHANGE with env var FS_UNCLEAN=0)
Signed-off-by: Denis Karpov <ext-denis.2.karpov@xxxxxxxxx>
---
fs/partitions/check.c | 42 ++++++++++++++++++++++++++++++++++++++++++
include/linux/genhd.h | 2 ++
2 files changed, 44 insertions(+), 0 deletions(-)
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 99e33ef..191d89e 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -196,6 +196,24 @@ check_partition(struct gendisk *hd, struct block_device *bdev)
return ERR_PTR(res);
}
+void notify_part_fs_unclean(struct device *dev, uint8_t unclean)
+{
+ char event_string[13];
+ char *envp[] = { event_string, NULL };
+
+ if ((unclean != 0 && unclean != 1) ||
+ unclean == dev_to_part(dev)->fs_unclean)
+ return;
+
+ dev_to_part(dev)->fs_unclean = unclean;
+
+ sysfs_notify(&dev->kobj, NULL, "fs_unclean");
+
+ sprintf(event_string, "FS_UNCLEAN=%u", unclean);
+ kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
+}
+EXPORT_SYMBOL(notify_part_fs_unclean);
+
static ssize_t part_partition_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -246,6 +264,26 @@ ssize_t part_stat_show(struct device *dev,
jiffies_to_msecs(part_stat_read(p, time_in_queue)));
}
+ssize_t part_fs_unclean_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct hd_struct *p = dev_to_part(dev);
+
+ return sprintf(buf, "%d\n", p->fs_unclean);
+}
+
+ssize_t part_fs_unclean_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int i;
+
+ if (count > 0 && sscanf(buf, "%d", &i) > 0)
+ notify_part_fs_unclean(dev, (i == 0) ? 0 : 1);
+
+ return count;
+}
+
#ifdef CONFIG_FAIL_MAKE_REQUEST
ssize_t part_fail_show(struct device *dev,
struct device_attribute *attr, char *buf)
@@ -273,6 +311,9 @@ static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
+static struct device_attribute dev_attr_fs_unclean =
+ __ATTR(fs_unclean, S_IRUGO|S_IWUSR, part_fs_unclean_show,
+ part_fs_unclean_store);
#ifdef CONFIG_FAIL_MAKE_REQUEST
static struct device_attribute dev_attr_fail =
__ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
@@ -283,6 +324,7 @@ static struct attribute *part_attrs[] = {
&dev_attr_start.attr,
&dev_attr_size.attr,
&dev_attr_stat.attr,
+ &dev_attr_fs_unclean.attr,
#ifdef CONFIG_FAIL_MAKE_REQUEST
&dev_attr_fail.attr,
#endif
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index a1a28ca..2e6d42e 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -98,6 +98,7 @@ struct hd_struct {
#endif
unsigned long stamp;
int in_flight;
+ int fs_unclean;
#ifdef CONFIG_SMP
struct disk_stats *dkstats;
#else
@@ -528,6 +529,7 @@ extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
sector_t len, int flags);
extern void delete_partition(struct gendisk *, int);
extern void printk_all_partitions(void);
+extern void notify_part_fs_unclean(struct device *dev, uint8_t unclean);
extern struct gendisk *alloc_disk_node(int minors, int node_id);
extern struct gendisk *alloc_disk(int minors);
--
1.6.3.1
--
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