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dm thin: disable discard support for thin devices if pool's is disabled 

If the pool is configured with 'ignore_discard' its discard support is
disabled.  The pool's thin devices should also have queue_limits that
reflect discards are disabled.

Fixes: 34fbcf62 ("dm thin: range discard support")
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # 4.1+
This commit is contained in:
Mike Snitzer 2015-09-08 08:56:13 -04:00
parent 6ff33f3902
commit 216076705d
1 changed files with 4 additions and 0 deletions
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4
drivers/md/dm-thin.c
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@ -4249,6 +4249,10 @@ static void thin_io_hints(struct dm_target *ti, struct queue_limits *limits)
{
struct thin_c *tc = ti->private;
struct pool *pool = tc->pool;
struct queue_limits *pool_limits = dm_get_queue_limits(pool->pool_md);
if (!pool_limits->discard_granularity)
return; /* pool's discard support is disabled */
limits->discard_granularity = pool->sectors_per_block << SECTOR_SHIFT;
limits->max_discard_sectors = 2048 * 1024 * 16; /* 16G */