Create a uevent before calling dm_table_event() when either data or
metadata low water are hit, as well as when pool mode changes.
Signed-off-by: Andy Grover <agro...@redhat.com>
---
drivers/md/dm-thin.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 92237b6..b9fa18f 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -7,6 +7,7 @@
#include "dm-thin-metadata.h"
#include "dm-bio-prison.h"
#include "dm.h"
+#include "dm-uevent.h"
#include <linux/device-mapper.h>
#include <linux/dm-io.h>
@@ -1345,6 +1346,20 @@ static int commit(struct pool *pool)
return r;
}
+static void add_thin_uevent(struct dm_target *ti, char *name)
+{
+ struct mapped_device *md = dm_table_get_md(ti->table);
+ struct dm_uevent *event;
+
+ event = dm_build_uevent(md, ti, KOBJ_CHANGE, name);
+ if (IS_ERR(event)) {
+ DMERR("%s: dm_build_uevent() failed", __func__);
+ return;
+ }
+
+ dm_uevent_add(md, &event->elist);
+}
+
static void check_low_water_mark(struct pool *pool, dm_block_t free_blocks)
{
unsigned long flags;
@@ -1355,6 +1370,7 @@ static void check_low_water_mark(struct pool *pool,
dm_block_t free_blocks)
spin_lock_irqsave(&pool->lock, flags);
pool->low_water_triggered = true;
spin_unlock_irqrestore(&pool->lock, flags);
+ add_thin_uevent(pool->ti, "THIN_LOW_WATER_DATA");
dm_table_event(pool->ti->table);
}
}
@@ -2331,6 +2347,7 @@ static enum pool_mode get_pool_mode(struct pool *pool)
static void notify_of_pool_mode_change(struct pool *pool, const char *new_mode)
{
+ add_thin_uevent(pool->ti, "THIN_POOL_MODE");
dm_table_event(pool->ti->table);
DMINFO("%s: switching pool to %s mode",
dm_device_name(pool->pool_md), new_mode);
@@ -3026,6 +3043,7 @@ static void metadata_low_callback(void *context)
DMWARN("%s: reached low water mark for metadata device: sending event.",
dm_device_name(pool->pool_md));
+ add_thin_uevent(pool->ti, "THIN_LOW_WATER_METADATA");
dm_table_event(pool->ti->table);
}
--
2.5.0
--
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