Messages in this thread Patch in this message | | | From | Namjae Jeon <> | Subject | [PATCH v2 5/9] loop: use generic helper to set max_discard_sectors | Date | Sat, 20 Apr 2013 01:41:39 +0900 |
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From: Namjae Jeon <namjae.jeon@samsung.com>
It is better to use blk_queue_max_discard_sectors helper function to set max_discard_sectors as it checks max_discard_sectors upper limit UINT_MAX >> 9
similar issue was reported for mmc in below link https://lkml.org/lkml/2013/4/1/292
If multiple discard requests get merged, merged discard request's size exceeds 4GB, there is possibility that merged discard request's __data_len field may overflow.
This patch fixes this issue.
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com> Signed-off-by: Vivek Trivedi <t.vivek@samsung.com> --- drivers/block/loop.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c index b2955b3..aedc341 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -814,7 +814,7 @@ static void loop_config_discard(struct loop_device *lo) q->limits.discard_granularity = inode->i_sb->s_blocksize; q->limits.discard_alignment = 0; - q->limits.max_discard_sectors = UINT_MAX >> 9; + blk_queue_max_discard_sectors(q, UINT_MAX >> 9); q->limits.discard_zeroes_data = 1; queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); } -- 1.7.9.5
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