Commit d82ae52e authored by Mike Snitzer's avatar Mike Snitzer Committed by Jens Axboe

block: properly stack underlying max_segment_size to DM device

Without this patch all DM devices will default to BLK_MAX_SEGMENT_SIZE
(65536) even if the underlying device(s) have a larger value -- this is
due to blk_stack_limits() using min_not_zero() when stacking the
max_segment_size limit.


before patch:

after patch:
Reported-by: default avatarLukasz Flis <>
Signed-off-by: default avatarMike Snitzer <>
Cc: # v3.3+
Signed-off-by: default avatarJens Axboe <>
parent 7c8a3679
......@@ -144,6 +144,7 @@ void blk_set_stacking_limits(struct queue_limits *lim)
lim->discard_zeroes_data = 1;
lim->max_segments = USHRT_MAX;
lim->max_hw_sectors = UINT_MAX;
lim->max_segment_size = UINT_MAX;
lim->max_sectors = UINT_MAX;
lim->max_write_same_sectors = UINT_MAX;
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