find_hibernation_swap_type(9)

💖 find_hibernation_swap_type(9) 💖

okay so bestie, welcome to the Kernel API Manual — this one's find_hibernation_swap_type, and it's literally the "where's my swap device" girlie of hibernation. 🧚

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✨ NAME ✨

find_hibernation_swap_type — find the swap type for hibernation, no cap 🫶

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🌸 SYNOPSIS 🌸

int find_hibernation_swap_type (dev_t device , sector_t offset );

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🎀 ARGUMENTS 🎀

• device — the block device that's holding the resume image 👑
• offset — the offset within the device that identifies the swap area, iykyk ⭐

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🦋 DESCRIPTION 🦋

So the whole vibe here is: locate the swap device that corresponds to device and offset. That's it, that's the mission. 💅

Now, unlike pin_hibernation_swap_type, this function only performs a lookup — it does not mark the swap device as pinned for hibernation. Just a peek, no commitment. 🙈

And that's totally safe in the sysfs-based hibernation path, because user space is already frozen there and swapoff can't run concurrently. So nobody's gonna yank the rug out from under you mid-lookup. 😭🔥

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🌈 RETURN 🌈

• A non-negative swap type on success — slay ✨
• -EINVAL if device is invalid 💀
• -ENODEV if no matching swap device is found 🍓

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👑 SEE ALSO 👑

Kernel file ./mm/swapfile.c

• swap_put_entries_cluster(9)
• swap_dup_entries_cluster(9)
• folio_alloc_swap(9)
• folio_dup_swap(9)
• folio_put_swap(9)
• swap_entry_swapped(9)
• folio_free_swap(9)
• swap_put_entries_direct(9)
• swap_alloc_hibernation_slot(9)
• swap_free_hibernation_slot(9)
• pin_hibernation_swap_type(9)
• unpin_hibernation_swap_type(9)

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ngl bestie, if you're here it's probably because something in hibernation land is being dramatic. go read pin_hibernation_swap_type(9) next, it's giving sibling energy 🫶💜

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that's the whole page, mwah 💋 — brought to you by the gang in ./mm and dated October 2026 like the little time capsule it is 🎀✨