This is a note to let you know that I've just added the patch titled
dm cache: the CLEAN_SHUTDOWN flag was not being set
to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dm-cache-the-clean_shutdown-flag-was-not-being-set.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 3201ac452e84a8a368197d648c9b7011e061804a Mon Sep 17 00:00:00 2001
From: Joe Thornber <[email protected]>
Date: Thu, 22 Oct 2015 18:10:55 +0100
Subject: dm cache: the CLEAN_SHUTDOWN flag was not being set
From: Joe Thornber <[email protected]>
commit 3201ac452e84a8a368197d648c9b7011e061804a upstream.
If the CLEAN_SHUTDOWN flag is not set when a cache is loaded then all cache
blocks are marked as dirty and a full writeback occurs.
__commit_transaction() is responsible for setting/clearing
CLEAN_SHUTDOWN (based the flags_mutator that is passed in).
Fix this issue, of the cache's on-disk flags being wrong, by making sure
__commit_transaction() does not reset the flags after the mutator has
altered the flags in preparation for them being serialized to disk.
before:
sb_flags = mutator(le32_to_cpu(disk_super->flags));
disk_super->flags = cpu_to_le32(sb_flags);
disk_super->flags = cpu_to_le32(cmd->flags);
after:
disk_super->flags = cpu_to_le32(cmd->flags);
sb_flags = mutator(le32_to_cpu(disk_super->flags));
disk_super->flags = cpu_to_le32(sb_flags);
Reported-by: Bogdan Vasiliev <[email protected]>
Signed-off-by: Joe Thornber <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/md/dm-cache-metadata.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/md/dm-cache-metadata.c
+++ b/drivers/md/dm-cache-metadata.c
@@ -634,10 +634,10 @@ static int __commit_transaction(struct d
disk_super = dm_block_data(sblock);
+ disk_super->flags = cpu_to_le32(cmd->flags);
if (mutator)
update_flags(disk_super, mutator);
- disk_super->flags = cpu_to_le32(cmd->flags);
disk_super->mapping_root = cpu_to_le64(cmd->root);
disk_super->hint_root = cpu_to_le64(cmd->hint_root);
disk_super->discard_root = cpu_to_le64(cmd->discard_root);
Patches currently in stable-queue which might be from [email protected] are
queue-4.2/dm-btree-remove-fix-a-bug-when-rebalancing-nodes-after-removal.patch
queue-4.2/dm-cache-the-clean_shutdown-flag-was-not-being-set.patch
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