vdo_get_increment_limit(9)

💖 NAME 💖

Okay bestie, this is the vdo_get_increment_limit(9) page from the Kernel API Manual, and the whole mission is: determine how many new references a block can acquire. That’s it. That’s the lore. It’s giving “how many more friends can this block hold?” energy.

✨ SYNOPSIS ✨

u8 vdo_get_increment_limit (struct slab_depot *depot ,
       physical_block_number_t pbn );

Like, here’s the signature, preserved exactly because we do not mess with the source, periodt.

🎀 ARGUMENTS 🎀

• depot — the slab depot. That’s the depot in question, bestie.
• pbn — the physical block number that is being queried. Yep, the specific physical block we’re checking on.

💅 CONTEXT 💅

This method must be called from the physical zone thread of the PBN. No cap, that’s a requirement. Don’t just call it from anywhere and hope for the best; it’s got thread-specific main character energy.

🌸 RETURN 🌸

The number of available references. That’s the number you get back — the available-refs count.

🦋 SEE ALSO 🦋

Kernel file ./drivers/md/dm-vdo/slab-depot.c — that’s the source file — plus this entire iconic reference squad, in original order:

get_lock(9)
must_make_entries_to_flush(9)
is_reaping(9)
initialize_tail_block(9)
initialize_journal_state(9)
block_is_full(9)
is_slab_journal_blank(9)
mark_slab_journal_dirty(9)
compute_fullness_hint(9)
check_summary_drain_complete(9)
notify_summary_waiters(9)
finish_updating_slab_summary_block(9)
finish_update(9)
handle_write_error(9)
launch_write(9)
update_slab_summary_entry(9)
finish_reaping(9)
complete_reaping(9)
handle_flush_error(9)
flush_for_reaping(9)
reap_slab_journal(9)
adjust_slab_journal_block_reference(9)
release_journal_locks(9)
update_tail_block_location(9)
reopen_slab_journal(9)
complete_write(9)
write_slab_journal_block(9)
commit_tail(9)
encode_slab_journal_entry(9)
expand_journal_point(9)
add_entry(9)
vdo_attempt_replay_into_slab(9)
requires_reaping(9)
launch_reference_block_write(9)
finish_reference_block_write(9)
get_reference_counters_for_block(9)
pack_reference_block(9)
handle_io_error(9)
write_reference_block(9)
reference_count_to_status(9)
dirty_block(9)
get_reference_block(9)
slab_block_number_from_pbn(9)
get_reference_counter(9)
adjust_free_block_count(9)
increment_for_data(9)
decrement_for_data(9)
increment_for_block_map(9)
update_reference_count(9)
add_entry_from_waiter(9)
is_next_entry_a_block_map_increment(9)
add_entries(9)
reset_search_cursor(9)
advance_search_cursor(9)
vdo_adjust_reference_count_for_rebuild(9)
replay_reference_count_change(9)
find_zero_byte_in_word(9)
find_free_block(9)
search_current_reference_block(9)
search_reference_blocks(9)
make_provisional_reference(9)
dirty_all_reference_blocks(9)
match_bytes(9)
count_valid_references(9)
unpack_reference_block(9)
finish_reference_block_load(9)
load_reference_block_group(9)
load_reference_blocks(9)
drain_slab(9)
read_slab_journal_tail(9)
load_slab_journal(9)
get_next_slab(9)
has_slabs_to_scrub(9)
uninitialize_scrubber_vio(9)
finish_scrubbing(9)
slab_scrubbed(9)
abort_scrubbing(9)
handle_scrubber_error(9)
apply_block_entries(9)
apply_journal_entries(9)
start_scrubbing(9)
scrub_next_slab(9)
scrub_slabs(9)
get_depot_slab_iterator(9)
next_slab(9)
abort_waiter(9)
vdo_acquire_provisional_reference(9)
open_slab(9)
vdo_enqueue_clean_slab_waiter(9)
vdo_modify_reference_count(9)
vdo_notify_slab_journals_are_recovered(9)
make_slab(9)
allocate_slabs(9)
vdo_abandon_new_slabs(9)
release_recovery_journal_lock(9)
prepare_for_tail_block_commit(9)
schedule_tail_block_commit(9)
initialize_slab_scrubber(9)
initialize_slab_summary_block(9)
vdo_decode_slab_depot(9)
vdo_free_slab_depot(9)
vdo_record_slab_depot(9)
vdo_allocate_reference_counters(9)
get_slab_number(9)
vdo_get_slab(9)
vdo_is_physical_data_block(9)
vdo_get_slab_depot_allocated_blocks(9)
vdo_get_slab_depot_data_blocks(9)
finish_combining_zones(9)
combine_summaries(9)
finish_loading_summary(9)
load_slab_summary(9)
vdo_load_slab_depot(9)
vdo_prepare_slab_depot_to_allocate(9)
vdo_update_slab_depot_size(9)
vdo_prepare_to_grow_slab_depot(9)
finish_registration(9)
vdo_use_new_slabs(9)
stop_scrubbing(9)
vdo_drain_slab_depot(9)
resume_scrubbing(9)
vdo_resume_slab_depot(9)
vdo_commit_oldest_slab_journal_tail_blocks(9)
vdo_scrub_all_unrecovered_slabs(9)
get_block_allocator_statistics(9)
get_ref_counts_statistics(9)
get_slab_journal_statistics(9)
vdo_get_slab_depot_statistics(9)
vdo_dump_slab_depot(9)

Bye bestie 💖 — source/version: ./drivers/md/dm-vdo; date: October 2026; page: vdo_get_increment_limit(9).