vdo_wait_unt...ad_only_mode(9)

✨ NAME ✨

vdo_wait_until_not_entering_read_only_mode — okay so this one waits until literally zero read-only notifications are in progress, and then it locks the door so no new ones can start. bestie it's giving bouncer-at-the-club energy 💅

(this is a page from the Kernel API Manual, welcome to the function-reference corner of the group chat 🫶)

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🦋 SYNOPSIS 🦋

void vdo_wait_until_not_entering_read_only_mode (struct vdo_completion *parent );

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🎀 ARGUMENTS 🎀

• parent — the completion you hand over so it can get notified the moment no threads are entering read-only mode anymore. like "hey ping me when the coast is clear" ✨

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💖 DESCRIPTION 💖

So the whole vibe here is: this function waits until there are no read-only notifications in progress, and then it prevents any subsequent notifications from happening. no cap, the door is shut 🔒

Not me also telling you the escape hatch: notifications may be re-enabled by calling vdo_allow_read_only_mode_entry. that's the "okay you can come back in now" button 💫

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/md/dm-vdo/vdo.c Introduction(9)
• vdo_initialize_device_registry_once(9)
• filter_vdos_locked(9)
• vdo_find_matching(9)
• initialize_thread_config(9)
• get_thread_name(9)
• vdo_make_thread(9)
• register_vdo(9)
• vdo_format(9)
• initialize_vdo(9)
• vdo_make(9)
• free_listeners(9)
• unregister_vdo(9)
• vdo_destroy(9)
• finish_reading_super_block(9)
• handle_super_block_read_error(9)
• vdo_load_super_block(9)
• vdo_get_backing_device(9)
• vdo_get_device_name(9)
• vdo_synchronous_flush(9)
• vdo_get_state(9)
• vdo_set_state(9)
• vdo_get_admin_state(9)
• record_vdo(9)
• continue_parent(9)
• handle_geometry_block_save_error(9)
• vdo_save_geometry_block(9)
• handle_super_block_save_error(9)
• vdo_save_super_block(9)
• vdo_save_components(9)
• vdo_register_read_only_listener(9)
• notify_vdo_of_read_only_mode(9)
• vdo_enable_read_only_entry(9)
• as_notifier(9)
• finish_entering_read_only_mode(9)
• make_thread_read_only(9)
• vdo_allow_read_only_mode_entry(9)
• vdo_enter_read_only_mode(9)
• vdo_is_read_only(9)
• vdo_in_read_only_mode(9)
• vdo_in_recovery_mode(9)
• vdo_enter_recovery_mode(9)
• complete_synchronous_action(9)
• perform_synchronous_action(9)
• set_compression_callback(9)
• vdo_set_compressing(9)
• vdo_get_compressing(9)
• vdo_get_physical_blocks_allocated(9)
• vdo_get_physical_blocks_overhead(9)
• get_vdo_statistics(9)
• vdo_fetch_statistics_callback(9)
• vdo_fetch_statistics(9)
• vdo_get_callback_thread_id(9)
• vdo_dump_status(9)
• vdo_assert_on_admin_thread(9)
• vdo_assert_on_logical_zone_thread(9)
• vdo_assert_on_physical_zone_thread(9)
• vdo_get_physical_zone(9)

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💀 friendly reminder bestie: read-only mode is serious business — this is the kind of entry/exit choreography you do not freestyle. iykyk.

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and that's the whole page, mwah 💋 this gem lives in ./drivers/md/dm-vdo, and your girl October 2026 stamped it — slay, iconic, periodt. 🧚‍♀️✨👑