miss_read_end_req(9)

🌸 NAME 🌸

bestie, this is miss_read_end_req — the lil function that handles the end of a miss read request, no cap 💖

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✨ SYNOPSIS ✨

void miss_read_end_req (struct pcache_backing_dev_req *backing_req , int read_ret );

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🎀 ARGUMENTS 🎀

• backing_req — pointer to the request structure, like the main character of this whole operation 🫶
• read_ret — the return value of read. yes bestie, we're looking at what the read actually gave us 👀

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🦋 DESCRIPTION 🦋

okay so picture this 💅 — a backing request to read data from the backing_dev just finished, and this is the function that gets called when that happens. it's giving cleanup era, it's giving wrap-up vibes.

here's the tea, fr fr: if the key associated with the request is empty (a placeholder), the function does a whole lil routine 🧚:

• it allocates cache space for the key ✨
• it copies the data read from the bio into the cache 💾
• it updates the key's status 👑

but wait, there's a plot twist 😭 — if the key has been overwritten by a write request during this whole process, it gets deleted from the cache tree and no further action is taken. periodt. nothing else happens. the function simply moves on 💀

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🌈 SEE ALSO 🌈

kernel file ./drivers/md/dm-pcache/cache_req.c — and these iconic besties right here:

• cache_data_alloc(9)
• submit_cache_miss_req(9)
• read_walk_finally(9)
• cache_read(9)
• pcache_cache_flush(9)

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ngl bestie, go read those SEE ALSO entries too — iykyk 📚💜

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and that's the page!! 🎀 brought to you by ./drivers/md/dm-pcache, dated October 2026, slaying in the kernel API manual forever ⭐🔥 mwah 💋