Filipe Manana b769777d92
btrfs: use refcount_t type for the extent buffer reference counter ...
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 >
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b769777d92