bpf: Allow special fields in resizable hashtab

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Add support for timers, workqueues, task work, spin locks and kptrs.
Without this, users needing deferred callbacks, BPF_F_LOCK, or
refcounted kernel pointers in a dynamically-sized map have no option -
fixed-size htab is the only map supporting these field types.
Resizable hashtab should offer the same capability.

kptr semantics under in-place updates are identical to array map.

Properly clean up BTF record fields on element delete and map
teardown by wiring up bpf_obj_free_fields through a memory allocator
destructor, matching the pattern used by htab for non-prealloc maps.

Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Link: https://lore.kernel.org/r/20260605-rhash-v7-6-5b8e05f8630d@meta.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Mykyta Yatsenko 2026-06-05 04:41:23 -07:00 • committed by Alexei Starovoitov

parent 818e008482

commit 6905f86012

2 changed files with 104 additions and 10 deletions

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111

kernel/bpf/hashtab.c

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3

kernel/bpf/syscall.c

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