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a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=EIcjfB9IiI4px24ztqRk:22 a=ZYb1aymv9lumvOMjy-MA:9 a=QEXdDO2ut3YA:10 a=5yU3S35YU4bGjq-dph-N:22 a=Bho9c0fBagfJEIQBS7DQ:22 cc=ntf awl=host:13521 X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA3MDEwNiBTYWx0ZWRfX8mcf0vWlIq9F nblGc6mUMDDGHMQT7BbgyeS7Y6cxuCP/D2CFrZ4loJ2nDv+C4BzdSj5kFKm3MR5a7s2YOdARS28 r72N3fjakqdhZPUAIah3LEPDjxavZidjE3T6LozZ/TPk8ibkqQqa X-Proofpoint-GUID: Z9JmpuCDs3Cq9ry-rQdjc0D4BBI1KEjC X-Proofpoint-ORIG-GUID: Z9JmpuCDs3Cq9ry-rQdjc0D4BBI1KEjC X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA3MDEwNiBTYWx0ZWRfX0fUssDD30+bg Ee6QSI6zvdMxVBdByk/um+JWRWHvqPqDXOPDbRV42RmBaid1t6Q3MiYI3IlyepVa8mOF6wN6Ga6 zs9ON8ojq7wpnYMQKkBOMytTMs6qmkL33qz4JN/TqRshXA7RXfxA4QwYtzXz+YHJINM2B59SxmX usexcNL+p6lqGyFR5GYYr1ZuiSGB/rig9RNI94PGhk3q5kQwkQATaqCSMjCGXCLP+cRtGMKcwpC 0wg0Tnqm6dni1fjw05aDo+IGBpCGEu6fOeTYTJoHb+ZccFjEBOrpiLkUMW7B2yyTCYTuCJqKI/n N5sqyqWTJWs1L/LZwLhB1tDPIR0/TWzb5Q7sQxbHIyUQBZCNfWLqS7YuTtLhHPCiddSl22cTPna 36Q3rgC+JwLxtvRNX2QFIC8TCS+qSeqZK2BTuB8H+ABZlIqGXe+6l71OsZZ+sHL+w+CBQalALo4 9UgzCKzTMqtJdltfGala+t/I8iokpRdnhyGVP9Q0= On 21/08/2026 11:10, Yao Sang wrote: > A same-LBA multipath head and its paths address the same logical block > space, so they do not need mapped-range topology calculations. > > Add blk_stack_mpath_limits() to stack limits that may differ between > paths, and blk_set_mpath_head_limits() to set head limits that are > expected to be identical across paths. Export both helpers and use them > for NVMe namespace heads. > > Initialize max_hw_discard_sectors to UINT_MAX before stacking the first > path. A zero limit means that a path does not support discard, so it > disables discard for the head. > > Signed-off-by: Yao Sang > --- > block/blk-settings.c | 58 +++++++++++++++++++++++++++++++++++ > drivers/nvme/host/core.c | 34 ++------------------- > drivers/nvme/host/multipath.c | 2 ++ > include/linux/blkdev.h | 3 ++ > 4 files changed, 65 insertions(+), 32 deletions(-) > > diff --git a/block/blk-settings.c b/block/blk-settings.c > index eaba38370657..8f70bab0a814 100644 > --- a/block/blk-settings.c > +++ b/block/blk-settings.c > @@ -800,6 +800,64 @@ static void blk_stack_path_limits(struct queue_limits *t, > t->dma_alignment = max(t->dma_alignment, b->dma_alignment); > } > > +/** > + * blk_set_mpath_head_limits - set head limits common to all paths > + * @t: limits for the multipath head > + * @b: limits for one path > + * > + * Set head limits that are expected to be identical across paths. Stack > + * limits that may differ between paths with blk_stack_mpath_limits(). > + */ > +void blk_set_mpath_head_limits(struct queue_limits *t, > + struct queue_limits *b) nit: mpath_head is a NVMe multipath term, so maybe we need something more generic > +{ > + t->logical_block_size = b->logical_block_size; > + t->physical_block_size = b->physical_block_size; > + t->alignment_offset = b->alignment_offset; > + t->io_min = b->io_min; > + t->io_opt = b->io_opt; I would not say that io_opt is really fixed for the disk. For SCSI, we change this value from transport/HBA factors - see sd_revalidate_disk() and how io_opt may change from the SCSI HBA limits. I think that you need to take a conservative approach here in deciding what is a fixed limit for a disk. > + t->discard_granularity = b->discard_granularity; > + t->discard_alignment = b->discard_alignment; > + t->zone_write_granularity = b->zone_write_granularity; > + t->max_write_streams = b->max_write_streams; > + t->write_stream_granularity = b->write_stream_granularity; > +} > +EXPORT_SYMBOL_GPL(blk_set_mpath_head_limits);