6.15-stable review patch. If anyone has any objections, please let me know.
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From: Christoph Hellwig hch@lst.de
[ Upstream commit fad6551fcf537375702b9af012508156a16a1ff7 ]
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: 3c407dc723bb ("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 Signed-off-by: Sasha Levin sashal@kernel.org --- block/blk-settings.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/block/blk-settings.c b/block/blk-settings.c index d8c79e5112b4..47a31e1c0909 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -347,12 +347,19 @@ 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