swap_cache_get_shadow(9)

✨ swap_cache_get_shadow(9) ✨

okay so bestie, welcome to the Kernel API Manual 💅 this one is a little function with a big job, and it lives right here in section 9, so pull up a chair 🎀

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🌸 NAME 🌸

swap_cache_get_shadow — it looks up a shadow in the swap cache. that's it, that's the whole vibe 🦋

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💖 SYNOPSIS 💖

void * swap_cache_get_shadow (swp_entry_t entry );

like, one argument, one return, no cap ✨

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🎀 ARGUMENTS 🎀

• entry — the swap entry used for the lookup. this is the little key you hand over so it knows what to go find 🔑

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🫶 CONTEXT 🫶

okay this part is important, listen up 🙈 the caller has to make sure entry is actually valid, and has to protect the swap device with a reference count or locks. like, do not just roll up unprepared, bestie — that's the whole assignment 💀

fr fr, valid entry + protection (refcount or locks) = required. not optional. periodt.

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💅 RETURN 💅

it returns either NULL or an XA_VALUE (that's the shadow). so… shadow or nothing, iconic either way 👑

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🌈 SEE ALSO 🌈

the whole friend group lives in the kernel file ./mm/swap_state.c, and honestly? obsessed with this lineup 🧚

• swap_cache_get_folio(9)
• swap_cache_has_folio(9)
• __swap_cache_add_check(9)
• __swap_cache_add_folio(9)
• __swap_cache_del_folio(9)
• swap_cache_del_folio(9)
• __swap_cache_replace_folio(9)
• swap_cache_alloc_folio(9)
• swap_update_readahead(9)
• swapin_sync(9)
• swap_cluster_readahead(9)
• swap_vma_readahead(9)
• swapin_readahead(9)

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⭐ and that's the page!! this lil cutie comes to you from the source ./mm and it's dated October 2026, so yeah, fresh 💖 thanks for reading bestie, go forth and look up those shadows 🦋💜