linux

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Filipe Manana 98f97e2616 btrfs: use refcount_t type for the extent buffer reference counter

[ Upstream commit b769777d92 ]

Instead of using a bare atomic, use the refcount_t type, which despite
being a structure that contains only an atomic, has an API that checks
for underflows and other hazards. This doesn't change the size of the
extent_buffer structure.

This removes the need to do things like this:

    WARN_ON(atomic_read(&eb->refs) == 0);
    if (atomic_dec_and_test(&eb->refs)) {
        (...)
    }

And do just:

    if (refcount_dec_and_test(&eb->refs)) {
        (...)
    }

Since refcount_dec_and_test() already triggers a warning when we decrement
a ref count that has a value of 0 (or below zero).

Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Stable-dep-of: ad580dfa38 ("btrfs: fix subpage deadlock in try_release_subpage_extent_buffer()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2025-08-28 16:34:33 +02:00

events

btrfs: use refcount_t type for the extent buffer reference counter

2025-08-28 16:34:33 +02:00

misc

nfsd: add a tracepoint for nfsd_setattr

2025-05-11 19:48:30 -04:00

stages

tracing: Add __print_dynamic_array() helper

2024-10-30 17:24:32 +01:00

bpf_probe.h

tracepoint: Have tracepoints created with DECLARE_TRACE() have _tp suffix