cache_pos_onmedia_crc(9)

💅 cache_pos_onmedia_crc(9)

okay so bestie, welcome to the Kernel API Manual — this is the page for cache_pos_onmedia_crc, and honestly? it's a little one but it's doing its job and we respect that 🫶

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✨ NAME ✨

cache_pos_onmedia_crc — calculates the CRC for an on-media cache position. that's it, that's the whole vibe 💫

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🌸 SYNOPSIS 🌸

u32 cache_pos_onmedia_crc (struct pcache_cache_pos_onmedia *pos_om );

like… one function, one pointer, no drama. main character energy fr 🎀

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🦋 ARGUMENTS 🦋

• pos_om — pointer to a pcache_cache_pos_onmedia structure. yes it's a pointer, no you don't get to skip it, that's literally the whole input bestie 💅

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🔥 DESCRIPTION 🔥

so what does it actually do? it calculates the CRC-32 checksum of the position — but hear me out — it excludes the first 4 bytes. not me skipping the first four bytes like they're the group chat messages I left on read 🙈

then it returns the computed CRC value. that's the whole arc, beginning to end, no cliffhanger 💀✨

ngl it's short, but it's iconic. do not forget the "excluding the first 4 bytes" part, that's the whole point of it 😭

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👑 SEE ALSO 👑

go touch some other kernel files, iykyk:

• Kernel file ./drivers/md/dm-pcache/cache.h
• cache_seg_is_ctrl_seg(9)
• cache_seg_id_valid(9)
• cache_key_cutfront(9)
• cache_key_cutback(9)
• cache_key_data_crc(9)
• kset_onmedia_valid(9)
• cache_seg_remain(9)
• cache_key_invalid(9)
• cache_key_lstart(9)
• cache_key_lend(9)

the way this is basically a whole friend group of cache functions and this one is just the CRC one standing there 🧚🌈

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⭐ sign-off ⭐

this page came to you straight from ./drivers/md/dm-pcache, stamped October 2026 — that's the source and the date, and honestly? slay. periodt. go check your CRC-32s, bestie 💖🍓💜