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path: root/drivers/md/dm-thin.c
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Diffstat (limited to 'drivers/md/dm-thin.c')
-rw-r--r--drivers/md/dm-thin.c72
1 files changed, 37 insertions, 35 deletions
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 0bd8d498b3b9..dadd9696340c 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -195,7 +195,7 @@ static void throttle_unlock(struct throttle *t)
struct dm_thin_new_mapping;
/*
- * The pool runs in 4 modes. Ordered in degraded order for comparisons.
+ * The pool runs in various modes. Ordered in degraded order for comparisons.
*/
enum pool_mode {
PM_WRITE, /* metadata may be changed */
@@ -282,9 +282,38 @@ struct pool {
mempool_t mapping_pool;
};
-static enum pool_mode get_pool_mode(struct pool *pool);
static void metadata_operation_failed(struct pool *pool, const char *op, int r);
+static enum pool_mode get_pool_mode(struct pool *pool)
+{
+ return pool->pf.mode;
+}
+
+static void notify_of_pool_mode_change(struct pool *pool)
+{
+ const char *descs[] = {
+ "write",
+ "out-of-data-space",
+ "read-only",
+ "read-only",
+ "fail"
+ };
+ const char *extra_desc = NULL;
+ enum pool_mode mode = get_pool_mode(pool);
+
+ if (mode == PM_OUT_OF_DATA_SPACE) {
+ if (!pool->pf.error_if_no_space)
+ extra_desc = " (queue IO)";
+ else
+ extra_desc = " (error IO)";
+ }
+
+ dm_table_event(pool->ti->table);
+ DMINFO("%s: switching pool to %s%s mode",
+ dm_device_name(pool->pool_md),
+ descs[(int)mode], extra_desc ? : "");
+}
+
/*
* Target context for a pool.
*/
@@ -2351,8 +2380,6 @@ static void do_waker(struct work_struct *ws)
queue_delayed_work(pool->wq, &pool->waker, COMMIT_PERIOD);
}
-static void notify_of_pool_mode_change_to_oods(struct pool *pool);
-
/*
* We're holding onto IO to allow userland time to react. After the
* timeout either the pool will have been resized (and thus back in
@@ -2365,7 +2392,7 @@ static void do_no_space_timeout(struct work_struct *ws)
if (get_pool_mode(pool) == PM_OUT_OF_DATA_SPACE && !pool->pf.error_if_no_space) {
pool->pf.error_if_no_space = true;
- notify_of_pool_mode_change_to_oods(pool);
+ notify_of_pool_mode_change(pool);
error_retry_list_with_code(pool, BLK_STS_NOSPC);
}
}
@@ -2433,26 +2460,6 @@ static void noflush_work(struct thin_c *tc, void (*fn)(struct work_struct *))
/*----------------------------------------------------------------*/
-static enum pool_mode get_pool_mode(struct pool *pool)
-{
- return pool->pf.mode;
-}
-
-static void notify_of_pool_mode_change(struct pool *pool, const char *new_mode)
-{
- dm_table_event(pool->ti->table);
- DMINFO("%s: switching pool to %s mode",
- dm_device_name(pool->pool_md), new_mode);
-}
-
-static void notify_of_pool_mode_change_to_oods(struct pool *pool)
-{
- if (!pool->pf.error_if_no_space)
- notify_of_pool_mode_change(pool, "out-of-data-space (queue IO)");
- else
- notify_of_pool_mode_change(pool, "out-of-data-space (error IO)");
-}
-
static bool passdown_enabled(struct pool_c *pt)
{
return pt->adjusted_pf.discard_passdown;
@@ -2501,8 +2508,6 @@ static void set_pool_mode(struct pool *pool, enum pool_mode new_mode)
switch (new_mode) {
case PM_FAIL:
- if (old_mode != new_mode)
- notify_of_pool_mode_change(pool, "failure");
dm_pool_metadata_read_only(pool->pmd);
pool->process_bio = process_bio_fail;
pool->process_discard = process_bio_fail;
@@ -2516,8 +2521,6 @@ static void set_pool_mode(struct pool *pool, enum pool_mode new_mode)
case PM_OUT_OF_METADATA_SPACE:
case PM_READ_ONLY:
- if (!is_read_only_pool_mode(old_mode))
- notify_of_pool_mode_change(pool, "read-only");
dm_pool_metadata_read_only(pool->pmd);
pool->process_bio = process_bio_read_only;
pool->process_discard = process_bio_success;
@@ -2538,8 +2541,6 @@ static void set_pool_mode(struct pool *pool, enum pool_mode new_mode)
* alarming rate. Adjust your low water mark if you're
* frequently seeing this mode.
*/
- if (old_mode != new_mode)
- notify_of_pool_mode_change_to_oods(pool);
pool->out_of_data_space = true;
pool->process_bio = process_bio_read_only;
pool->process_discard = process_discard_bio;
@@ -2552,8 +2553,6 @@ static void set_pool_mode(struct pool *pool, enum pool_mode new_mode)
break;
case PM_WRITE:
- if (old_mode != new_mode)
- notify_of_pool_mode_change(pool, "write");
if (old_mode == PM_OUT_OF_DATA_SPACE)
cancel_delayed_work_sync(&pool->no_space_timeout);
pool->out_of_data_space = false;
@@ -2573,6 +2572,9 @@ static void set_pool_mode(struct pool *pool, enum pool_mode new_mode)
* doesn't cause an unexpected mode transition on resume.
*/
pt->adjusted_pf.mode = new_mode;
+
+ if (old_mode != new_mode)
+ notify_of_pool_mode_change(pool);
}
static void abort_transaction(struct pool *pool)
@@ -4023,7 +4025,7 @@ static struct target_type pool_target = {
.name = "thin-pool",
.features = DM_TARGET_SINGLETON | DM_TARGET_ALWAYS_WRITEABLE |
DM_TARGET_IMMUTABLE,
- .version = {1, 20, 0},
+ .version = {1, 21, 0},
.module = THIS_MODULE,
.ctr = pool_ctr,
.dtr = pool_dtr,
@@ -4397,7 +4399,7 @@ static void thin_io_hints(struct dm_target *ti, struct queue_limits *limits)
static struct target_type thin_target = {
.name = "thin",
- .version = {1, 20, 0},
+ .version = {1, 21, 0},
.module = THIS_MODULE,
.ctr = thin_ctr,
.dtr = thin_dtr,