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-rw-r--r--Documentation/device-mapper/thin-provisioning.txt7
-rw-r--r--drivers/md/dm-thin.c6
2 files changed, 10 insertions, 3 deletions
diff --git a/Documentation/device-mapper/thin-provisioning.txt b/Documentation/device-mapper/thin-provisioning.txt
index b8a57b9cec19..883e7ca5f745 100644
--- a/Documentation/device-mapper/thin-provisioning.txt
+++ b/Documentation/device-mapper/thin-provisioning.txt
@@ -281,7 +281,7 @@ ii) Status
<transaction id> <used metadata blocks>/<total metadata blocks>
<used data blocks>/<total data blocks> <held metadata root>
ro|rw|out_of_data_space [no_]discard_passdown [error|queue]_if_no_space
- needs_check|-
+ needs_check|- metadata_low_watermark
transaction id:
A 64-bit number used by userspace to help synchronise with metadata
@@ -328,6 +328,11 @@ ii) Status
thin-pool can be made fully operational again. '-' indicates
needs_check is not set.
+ metadata_low_watermark:
+ Value of metadata low watermark in blocks. The kernel sets this
+ value internally but userspace needs to know this value to
+ determine if an event was caused by crossing this threshold.
+
iii) Messages
create_thin <dev id>
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index b900723bbd0f..c44477d7a9ea 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -3890,6 +3890,8 @@ static void pool_status(struct dm_target *ti, status_type_t type,
else
DMEMIT("- ");
+ DMEMIT("%llu ", (unsigned long long)calc_metadata_threshold(pt));
+
break;
case STATUSTYPE_TABLE:
@@ -3979,7 +3981,7 @@ static struct target_type pool_target = {
.name = "thin-pool",
.features = DM_TARGET_SINGLETON | DM_TARGET_ALWAYS_WRITEABLE |
DM_TARGET_IMMUTABLE,
- .version = {1, 19, 0},
+ .version = {1, 20, 0},
.module = THIS_MODULE,
.ctr = pool_ctr,
.dtr = pool_dtr,
@@ -4353,7 +4355,7 @@ static void thin_io_hints(struct dm_target *ti, struct queue_limits *limits)
static struct target_type thin_target = {
.name = "thin",
- .version = {1, 19, 0},
+ .version = {1, 20, 0},
.module = THIS_MODULE,
.ctr = thin_ctr,
.dtr = thin_dtr,