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block: ensure discard_granularity is zero when discard is not supported

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Documentation/ABI/stable/sysfs-block states:

  What: /sys/block/<disk>/queue/discard_granularity
  [...]
  A discard_granularity of 0 means that the device does not support
  discard functionality.

but this got broken when sorting out the block limits updates.  Fix this
by setting the discard_granularity limit to zero when the combined
max_discard_sectors is zero.

Fixes: 3c407dc723 ("block: default the discard granularity to sector size")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20250731152228.873923-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2025-07-31 08:22:28 -07:00 • committed by Jens Axboe
parent 765761851d
commit fad6551fcf
1 changed files with 10 additions and 3 deletions
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13
block/blk-settings.c
View file

@ -400,12 +400,19 @@ int blk_validate_limits(struct queue_limits *lim)
lim->max_discard_sectors =
min(lim->max_hw_discard_sectors, lim->max_user_discard_sectors);
/*
* When discard is not supported, discard_granularity should be reported
* as 0 to userspace.
*/
if (lim->max_discard_sectors)
lim->discard_granularity =
max(lim->discard_granularity, lim->physical_block_size);
else
lim->discard_granularity = 0;
if (!lim->max_discard_segments)
lim->max_discard_segments = 1;
if (lim->discard_granularity < lim->physical_block_size)
lim->discard_granularity = lim->physical_block_size;
/*
* By default there is no limit on the segment boundary alignment,
* but if there is one it can't be smaller than the page size as