STRUCT ACTION_MANAGER(9)

✨ struct action_manager(9) ✨

okay so bestie, we're in the Kernel API Manual today and the star of the show is struct action_manager — yes that's section 9 of the manual, iykyk 💅

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🌸 NAME 🌸

struct action_manager — the actual definition of an action manager. that's it, that's the vibe check 🦋

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🎀 SYNOPSIS 🎀

struct action_manager {
    struct vdo_completion completion;
    struct admin_state state;
    struct action actions[2];
    struct action *current_action;
    zone_count_t zones;
    vdo_action_scheduler_fn scheduler;
    vdo_zone_thread_getter_fn get_zone_thread_id;
    thread_id_t initiator_thread_id;
    void *context;
    zone_count_t acting_zone;
 };

literally the whole struct, laid out, no cap 🫶

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💖 MEMBERS 💖

okay so every single field, and what it's giving:

• completion — the completion for performing actions. it's the whole reason this manager gets to do things ✨
• state — the state of this action manager. current mood, basically 🌈
• actions — the two action slots. yes, 2. both of them. 💅
• current_action — the current action slot. the one holding the aux right now 🎶
• zones — the number of zones in which an action is to be applied. so many zones, so little time 😭
• scheduler — a function to schedule a default next action. it plans ahead, main character energy fr fr 👑
• get_zone_thread_id — a function to get the id of the thread on which to apply an action to a zone. it's the find-my-friend function for threads 🔥
• initiator_thread_id — the ID of the thread on which actions may be initiated. this is the thread, the originator, the one who starts things 🧚
• context — opaque data associated with this action manager. mysterious. iconic. we don't look inside 🙈
• acting_zone — the zone currently being acted upon. right here, right now, this one 🌸

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👑 SEE ALSO 👑

bestie these are the friends you should also go read, all of them, don't skip:

Kernel file ./drivers/md/dm-vdo/action-manager.c, struct action(9), vdo_make_action_manager(9), vdo_schedule_default_action(9), vdo_schedule_action(9), vdo_schedule_operation(9), vdo_schedule_operation_with_context(9)

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💀 friendly reminder: everything above is exactly as written in the page — the fields, the functions, the file path. I'm hyping it up, not editing it. don't come for me 🫶

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and that's the whole page diva!! this one's straight out of ./drivers/md/dm-vdo, version dated October 2026, filed under struct action_manager(9) — go slay your kernel reading list 💜✨