[PATCH] dm bufio: fully initialize shrinker

[PATCH] dm bufio: fully initialize shrinker

[Greg Thelen]

1d3d4437eae1 ("vmscan: per-node deferred work") added a flags field to
struct shrinker assuming that all shrinkers were zero filled.  The dm
bufio shrinker is not zero filled, which leaves arbitrary kmalloc() data
in flags.  So far the only defined flags bit is SHRINKER_NUMA_AWARE.
But there are proposed patches which add other bits to shrinker.flags
(e.g. memcg awareness).

Rather than simply initializing the shrinker, this patch uses kzalloc()
when allocating the dm_bufio_client to ensure that the embedded shrinker
and any other similar structures are zeroed.

This fixes theoretical over aggressive shrinking of dm bufio objects.
If the uninitialized dm_bufio_client.shrinker.flags contains
SHRINKER_NUMA_AWARE then shrink_slab() would call the dm shrinker for
each numa node rather than just once.  This has been broken since 3.12.

Signed-off-by: Greg Thelen <gthelen@google.com>
---
 drivers/md/dm-bufio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index 4e84095833db..d724459860d9 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -1541,7 +1541,7 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign
 	BUG_ON(block_size < 1 << SECTOR_SHIFT ||
 	       (block_size & (block_size - 1)));
 
-	c = kmalloc(sizeof(*c), GFP_KERNEL);
+	c = kzalloc(sizeof(*c), GFP_KERNEL);
 	if (!c) {
 		r = -ENOMEM;
 		goto bad_client;
-- 
2.0.0.526.g5318336

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Re: [dm-devel] [PATCH] dm bufio: fully initialize shrinker

[Mikulas Patocka]

On Thu, 31 Jul 2014, Greg Thelen wrote:

> 1d3d4437eae1 ("vmscan: per-node deferred work") added a flags field to
> struct shrinker assuming that all shrinkers were zero filled.  The dm
> bufio shrinker is not zero filled, which leaves arbitrary kmalloc() data
> in flags.  So far the only defined flags bit is SHRINKER_NUMA_AWARE.
> But there are proposed patches which add other bits to shrinker.flags
> (e.g. memcg awareness).
> 
> Rather than simply initializing the shrinker, this patch uses kzalloc()
> when allocating the dm_bufio_client to ensure that the embedded shrinker
> and any other similar structures are zeroed.
> 
> This fixes theoretical over aggressive shrinking of dm bufio objects.
> If the uninitialized dm_bufio_client.shrinker.flags contains
> SHRINKER_NUMA_AWARE then shrink_slab() would call the dm shrinker for
> each numa node rather than just once.  This has been broken since 3.12.
> 
> Signed-off-by: Greg Thelen <gthelen@google.com>

Acked-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org	#v3.12

> ---
>  drivers/md/dm-bufio.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
> index 4e84095833db..d724459860d9 100644
> --- a/drivers/md/dm-bufio.c
> +++ b/drivers/md/dm-bufio.c
> @@ -1541,7 +1541,7 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign
>  	BUG_ON(block_size < 1 << SECTOR_SHIFT ||
>  	       (block_size & (block_size - 1)));
>  
> -	c = kmalloc(sizeof(*c), GFP_KERNEL);
> +	c = kzalloc(sizeof(*c), GFP_KERNEL);
>  	if (!c) {
>  		r = -ENOMEM;
>  		goto bad_client;
> -- 
> 2.0.0.526.g5318336
> 
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