ubi_register...ume_notifier(9)

💅 ubi_register...ume_notifier(9) — Kernel API Manual ✨

okay bestie, buckle up, because this is the page about registering a volume notifier and it's honestly kind of a big deal 👑

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🌸 NAME 🌸

ubi_register_volume_notifier — register a volume notifier. that's it, that's the whole name, and yes it slaps 💖

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✨ SYNOPSIS ✨

int ubi_register_volume_notifier (struct notifier_block *nb , int
       ignore_existing );

look at that signature. gorgeous. no notes. 🫶

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🎀 ARGUMENTS 🎀

• nb — the notifier description object. like, the whole entire description of your notifier. that's the vibe 🦋
• ignore_existing — if this is non-zero, then do not send an "added" notification for all the volumes that already exist. so basically: "bestie, i do not need the backstory, only tell me about new stuff" 🙈

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🔥 DESCRIPTION 🔥

so this function registers a volume notifier, which means notifications go out for volumes that get removed, re-sized, re-named, or updated. main character energy for the volume event pipeline, honestly 💀✨

the first argument of the function is the notification type. the second argument is a pointer to a struct ubi_notification object, and that's the thing that describes the notification event. iykyk 🌈

⚠️ okay this part is important, do NOT skip it: using the UBI API from the volume notifier is prohibited. like, prohibited prohibited. not "eh, probably fine" prohibited. just don't. ngl this is the kind of rule that exists because someone tried it and the kernel had opinions 😭

this function returns zero in case of success and a negative error code in case of failure. zero = slay, negative = go touch grass and debug 🧚

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🦋 SEE ALSO 🦋

kernel file ./drivers/mtd/ubi/kapi.c and also literally all of these, periodt:

• ubi_do_get_device_info(9)
• ubi_get_device_info(9)
• ubi_do_get_volume_info(9)
• ubi_get_volume_info(9)
• ubi_open_volume(9)
• ubi_open_volume_nm(9)
• ubi_get_num_by_path(9)
• ubi_open_volume_path(9)
• ubi_close_volume(9)
• leb_read_sanity_check(9)
• ubi_leb_read(9)
• ubi_leb_read_sg(9)
• ubi_leb_write(9)
• ubi_leb_erase(9)
• ubi_leb_unmap(9)
• ubi_leb_map(9)
• ubi_is_mapped(9)
• ubi_sync(9)
• ubi_unregister_volume_notifier(9)

like, the whole friend group showed up 💜

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and that's the page!! footer vibes for the girlies: this one lives in ./drivers/mtd/ubi, dated October 2026, and it's filed under ubi_register...ume_notifier(9) — go forth and register responsibly, bestie 🍓👑💅