| Message ID | 20201215105415.5219-1-tom.ty89@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | block: Avoid fragmented discard splits for ATA drives | expand |
diff --git a/block/blk.h b/block/blk.h index dfab98465db9..1dc12fc86de8 100644 --- a/block/blk.h +++ b/block/blk.h @@ -281,8 +281,11 @@ static inline unsigned int bio_allowed_max_sectors(struct request_queue *q) static inline unsigned int bio_aligned_discard_max_sectors( struct request_queue *q) { - return round_down(UINT_MAX, q->limits.discard_granularity) >> - SECTOR_SHIFT; + unsigned int granularity = q->limits.discard_granularity; + /* Avoid fragmented splits for ATA drives */ + if (128 % granularity == 0) + granularity = 128; + return round_down(UINT_MAX, granularity) >> SECTOR_SHIFT; } /*
When 0xffffffff >> 9 are splited by 0xffff * 64, there will be a remainder of 127. Avoid these small fragments by aligning the split to 128. Signed-off-by: Tom Yan <tom.ty89@gmail.com> --- block/blk.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)