From cdc2b4158405f1975f9d5205096f08430eda1c0e Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Fri, 14 Feb 2014 18:10:55 -0500 Subject: [PATCH] dm thin: synchronize the pool mode during suspend Commit b5330655 ("dm thin: handle metadata failures more consistently") increased potential for the pool's mode to be changed in response to metadata operation failures. When the pool mode is changed it isn't synchronized with the mode in pool_features stored in the target's context (ti->private) that is used as the basis for (re)establishing the pool mode during resume via bind_control_target. It is important that we synchronize the pool mode when it is changed otherwise the pool may experience and unexpected mode transition on the next resume (especially if there was no new table load). Signed-off-by: Mike Snitzer Acked-by: Joe Thornber --- drivers/md/dm-thin.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c index 7e84baccf0ad..dfa48ec7b8ea 100644 --- a/drivers/md/dm-thin.c +++ b/drivers/md/dm-thin.c @@ -1402,6 +1402,7 @@ static enum pool_mode get_pool_mode(struct pool *pool) static void set_pool_mode(struct pool *pool, enum pool_mode new_mode) { int r; + struct pool_c *pt = pool->ti->private; enum pool_mode old_mode = pool->pf.mode; switch (new_mode) { @@ -1448,6 +1449,11 @@ static void set_pool_mode(struct pool *pool, enum pool_mode new_mode) } pool->pf.mode = new_mode; + /* + * The pool mode may have changed, sync it so bind_control_target() + * doesn't cause an unexpected mode transition on resume. + */ + pt->adjusted_pf.mode = new_mode; } /* -- 2.20.1