read_walk_finally(9)

💖 NAME 💖

okay so this page is read_walk_finally(9) from the Kernel API Manual, and it's literally the function that finalizes the cache read tree walk by submitting any remaining backing requests. slay.

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✨ SYNOPSIS ✨

int read_walk_finally (struct pcache_cache_subtree_walk_ctx *ctx , int
       ret );

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🎀 ARGUMENTS 🎀

• ctx — Context structure holding information about the cache, read request, and submission list. it's giving "everything you need to know is in here" energy.
• ret — the return value after this walk.

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🦋 DESCRIPTION 🦋

So this function gets called at the end of the cache_subtree_walk during a cache read operation. It completes the walk by checking if any data requested by key was not found in the cache tree, and if so, it sends a backing request to retrieve that data. Then it iterates through the submission list of backing requests created during the walk, removing each request from the list and submitting it. no cap, that's the whole vibe.

The scenario managed here includes:

• Sending a backing request for the remaining length of key if it was not fulfilled by existing cache entries.
• Iterating through ctx->submit_req_list to submit each backing request enqueued during the walk.

This ensures all necessary backing requests for cache misses are submitted to the backing storage to retrieve any data that could not be found in the cache. literally making sure nothing gets left behind. periodt.

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🌈 SEE ALSO 🌈

Kernel file ./drivers/md/dm-pcache/cache_req.c cache_data_alloc(9), miss_read_end_req(9), submit_cache_miss_req(9), cache_read(9), pcache_cache_flush(9)

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🫶 and that's the page, bestie! this little icon came from ./drivers/md/dm-pcache and it's dated October 2026. mwah 💅✨