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null_blk: don't cap max_hw_sectors to BLK_DEF_MAX_SECTORS 

[ Upstream commit 9a9525de86 ]

null_blk has some rather odd capping of the max_hw_sectors value to
BLK_DEF_MAX_SECTORS, which doesn't make sense - max_hw_sector is the
hardware limit, and BLK_DEF_MAX_SECTORS despite the confusing name is the
default cap for the max_sectors field used for normal file system I/O.

Remove all the capping, and simply leave it to the block layer or
user to take up or not all of that for file system I/O.

Fixes: ea17fd354c ("null_blk: Allow controlling max_hw_sectors limit")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20231227092305.279567-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Christoph Hellwig 2023-12-27 09:23:02 +00:00 committed by Greg Kroah-Hartman
parent a623d31805
commit 6e9429f9c6
1 changed files with 2 additions and 10 deletions
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12
drivers/block/null_blk/main.c
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@ -2114,10 +2114,8 @@ static int null_add_dev(struct nullb_device *dev)
blk_queue_logical_block_size(nullb->q, dev->blocksize);
blk_queue_physical_block_size(nullb->q, dev->blocksize);
if (!dev->max_sectors)
dev->max_sectors = queue_max_hw_sectors(nullb->q);
dev->max_sectors = min(dev->max_sectors, BLK_DEF_MAX_SECTORS);
blk_queue_max_hw_sectors(nullb->q, dev->max_sectors);
if (dev->max_sectors)
blk_queue_max_hw_sectors(nullb->q, dev->max_sectors);
if (dev->virt_boundary)
blk_queue_virt_boundary(nullb->q, PAGE_SIZE - 1);
@ -2217,12 +2215,6 @@ static int __init null_init(void)
g_bs = PAGE_SIZE;
}
if (g_max_sectors > BLK_DEF_MAX_SECTORS) {
pr_warn("invalid max sectors\n");
pr_warn("defaults max sectors to %u\n", BLK_DEF_MAX_SECTORS);
g_max_sectors = BLK_DEF_MAX_SECTORS;
}
if (g_home_node != NUMA_NO_NODE && g_home_node >= nr_online_nodes) {
pr_err("invalid home_node value\n");
g_home_node = NUMA_NO_NODE;