rust block-mq TagSet flags plumbing and rnull blocking wiring#730
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TagSet::new() currently hardcodes blk_mq_tag_set.flags to 0. That prevents Rust block drivers from declaring blk-mq queue flags. Introduce TagSetFlags as a typed wrapper for BLK_MQ_F_* bits. Add TagSet::new_with_flags() so drivers can pass flags explicitly. Keep TagSet::new() as a compatibility wrapper using empty flags. Re-export TagSetFlags from kernel::block::mq for driver imports. Build-tested with LLVM=-15 in an out-of-tree rust-next build. Validation includes vmlinux and drivers/block/rnull/rnull_mod.ko. Signed-off-by: Wenzhao Liao <[email protected]>
Add a new configfs boolean attribute named blocking. Advertise blocking in the rnull features list. On power-on, map blocking=1 to TagSetFlags::BLOCKING. Create the tag set with TagSet::new_with_flags(). Keep default blocking=0 to preserve existing behavior. Like other parameters, blocking writes return -EBUSY while powered on. Validated with LLVM=-15 out-of-tree builds and QEMU runtime tests. Signed-off-by: Wenzhao Liao <[email protected]>
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Pull request for series with
subject: rust block-mq TagSet flags plumbing and rnull blocking wiring
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1079650