This is a note to let you know that I've just added the patch titled
dm thin: don't allow messages to be sent to a pool target in READ_ONLY or
FAIL mode
to the 3.18-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-thin-don-t-allow-messages-to-be-sent-to-a-pool-target-in-read_only-or-fail-mode.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 2a7eaea02b99b6e267b1e89c79acc6e9a51cee3b Mon Sep 17 00:00:00 2001
From: Joe Thornber <[email protected]>
Date: Mon, 26 Jan 2015 11:38:21 +0000
Subject: dm thin: don't allow messages to be sent to a pool target in READ_ONLY
or FAIL mode
From: Joe Thornber <[email protected]>
commit 2a7eaea02b99b6e267b1e89c79acc6e9a51cee3b upstream.
You can't modify the metadata in these modes. It's better to fail these
messages immediately than let the block-manager deny write locks on
metadata blocks. Otherwise these failed metadata changes will trigger
'needs_check' to get set in the metadata superblock -- requiring repair
using the thin_check utility.
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-thin.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -2978,6 +2978,12 @@ static int pool_message(struct dm_target
struct pool_c *pt = ti->private;
struct pool *pool = pt->pool;
+ if (get_pool_mode(pool) >= PM_READ_ONLY) {
+ DMERR("%s: unable to service pool target messages in READ_ONLY
or FAIL mode",
+ dm_device_name(pool->pool_md));
+ return -EINVAL;
+ }
+
if (!strcasecmp(argv[0], "create_thin"))
r = process_create_thin_mesg(argc, argv, pool);
Patches currently in stable-queue which might be from [email protected] are
queue-3.18/dm-cache-fix-missing-err_ptr-returns-and-handling.patch
queue-3.18/dm-thin-don-t-allow-messages-to-be-sent-to-a-pool-target-in-read_only-or-fail-mode.patch
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