[3.19.y-ckt stable] Patch "dm thin: restore requested 'error_if_no_space' setting on OODS to WRITE transition" has been added to staging queue
Kamal Mostafa
kamal at canonical.com
Tue Dec 15 21:24:14 UTC 2015
This is a note to let you know that I have just added a patch titled
dm thin: restore requested 'error_if_no_space' setting on OODS to WRITE transition
to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree
which can be found at:
http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue
This patch is scheduled to be released in version 3.19.8-ckt12.
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Kamal
------
>From f31d5cc5c23076c746178281f0ffe740409d027b Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer at redhat.com>
Date: Fri, 6 Nov 2015 10:53:01 -0500
Subject: dm thin: restore requested 'error_if_no_space' setting on OODS to
WRITE transition
commit 172c238612ebf81cabccc86b788c9209af591f61 upstream.
A thin-pool that is in out-of-data-space (OODS) mode may transition back
to write mode -- without the admin adding more space to the thin-pool --
if/when blocks are released (either by deleting thin devices or
discarding provisioned blocks).
But as part of the thin-pool's earlier transition to out-of-data-space
mode the thin-pool may have set the 'error_if_no_space' flag to true if
the no_space_timeout expires without more space having been made
available. That implementation detail, of changing the pool's
error_if_no_space setting, needs to be reset back to the default that
the user specified when the thin-pool's table was loaded.
Otherwise we'll drop the user requested behaviour on the floor when this
out-of-data-space to write mode transition occurs.
Reported-by: Vivek Goyal <vgoyal at redhat.com>
Signed-off-by: Mike Snitzer <snitzer at redhat.com>
Acked-by: Joe Thornber <ejt at redhat.com>
Fixes: 2c43fd26e4 ("dm thin: fix missing out-of-data-space to write mode transition if blocks are released")
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
drivers/md/dm-thin.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 734254f..4ada0cd 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -2183,6 +2183,7 @@ static void set_pool_mode(struct pool *pool, enum pool_mode new_mode)
case PM_WRITE:
if (old_mode != new_mode)
notify_of_pool_mode_change(pool, "write");
+ pool->pf.error_if_no_space = pt->requested_pf.error_if_no_space;
dm_pool_metadata_read_write(pool->pmd);
pool->process_bio = process_bio;
pool->process_discard = process_discard_bio;
--
1.9.1
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