dm thin: add 'no_space_timeout' dm-thin-pool module param

Commit 85ad643b ("dm thin: add timeout to stop out-of-data-space mode
holding IO forever") introduced a fixed 60 second timeout.  Users may
want to either disable or modify this timeout.

Allow the out-of-data-space timeout to be configured using the
'no_space_timeout' dm-thin-pool module param.  Setting it to 0 will
disable the timeout, resulting in IO being queued until more data space
is added to the thin-pool.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # 3.14+

2 files changed, 13 insertions, 4 deletions

diff --git a/Documentation/device-mapper/thin-provisioning.txt b/Documentation/device-mapper/thin-provisioning.txt
index 05a27e9442bd..2f5173500bd9 100644
--- a/Documentation/device-mapper/thin-provisioning.txt
+++ b/Documentation/device-mapper/thin-provisioning.txt
@@ -309,7 +309,10 @@ ii) Status
     error_if_no_space|queue_if_no_space
         If the pool runs out of data or metadata space, the pool will
         either queue or error the IO destined to the data device.  The
-        default is to queue the IO until more space is added.
+        default is to queue the IO until more space is added or the
+        'no_space_timeout' expires.  The 'no_space_timeout' dm-thin-pool
+        module parameter can be used to change this timeout -- it
+        defaults to 60 seconds but may be disabled using a value of 0.
 
 iii) Messages
 
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 2e71de8e0048..242ac2ea5f29 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -27,7 +27,9 @@
 #define MAPPING_POOL_SIZE 1024
 #define PRISON_CELLS 1024
 #define COMMIT_PERIOD HZ
-#define NO_SPACE_TIMEOUT (HZ * 60)
+#define NO_SPACE_TIMEOUT_SECS 60
+
+static unsigned no_space_timeout_secs = NO_SPACE_TIMEOUT_SECS;
 
 DECLARE_DM_KCOPYD_THROTTLE_WITH_MODULE_PARM(snapshot_copy_throttle,
                 "A percentage of time allocated for copy on write");
@@ -1670,6 +1672,7 @@ static void set_pool_mode(struct pool *pool, enum pool_mode new_mode)
         struct pool_c *pt = pool->ti->private;
         bool needs_check = dm_pool_metadata_needs_check(pool->pmd);
         enum pool_mode old_mode = get_pool_mode(pool);
+        unsigned long no_space_timeout = ACCESS_ONCE(no_space_timeout_secs) * HZ;
 
         /*
          * Never allow the pool to transition to PM_WRITE mode if user
@@ -1732,8 +1735,8 @@ static void set_pool_mode(struct pool *pool, enum pool_mode new_mode)
                 pool->process_prepared_mapping = process_prepared_mapping;
                 pool->process_prepared_discard = process_prepared_discard_passdown;
 
-                if (!pool->pf.error_if_no_space)
-                        queue_delayed_work(pool->wq, &pool->no_space_timeout, NO_SPACE_TIMEOUT);
+                if (!pool->pf.error_if_no_space && no_space_timeout)
+                        queue_delayed_work(pool->wq, &pool->no_space_timeout, no_space_timeout);
                 break;
 
         case PM_WRITE:
@@ -3508,6 +3511,9 @@ static void dm_thin_exit(void)
 module_init(dm_thin_init);
 module_exit(dm_thin_exit);
 
+module_param_named(no_space_timeout, no_space_timeout_secs, uint, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(no_space_timeout, "Out of data space queue IO timeout in seconds");
+
 MODULE_DESCRIPTION(DM_NAME " thin provisioning target");
 MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>");
 MODULE_LICENSE("GPL");