STRUCT FC_EXCH_POOL(9)

🦋 `struct fc_exch_pool(9)` 🦋

Okay bestie, welcome to the Kernel API Manual ✨ — this page is the one and only struct fc_exch_pool(9), and we are gonna get into it 💅.

💖 NAME 💖

struct fc_exch_pool — Per cpu exchange pool. That's the name, and it's lowkey iconic ✨.

✨ SYNOPSIS ✨

Here's the struct in all its glory, no edits, no cap:

struct fc_exch_pool {
    spinlock_t lock;
    struct list_head ex_list;
    u16 next_index;
    u16 total_exches;
    u16 left;
    u16 right;
 };

🎀 Members 🎀

lock — Exch pool lock. It's the lock for the exchange pool, periodt.
ex_list — List of exchanges. The actual list of exchanges, bestie.
next_index — Next possible free exchange index. Exactly what it says on the label.
total_exches — Total allocated exchanges. The total count of allocated exchanges.
left — Cache of free slot in exch array. A cached free slot in the exch array.
right — Cache of free slot in exch array. Another cached free slot in the exch array.

🌸 Description 🌸

So this structure is out here managing per cpu exchanges in an array of exchange pointers 🫶. That array is allocated followed by the struct fc_exch_pool memory, for the assigned range of exchanges to the per cpu pool. Literally the whole point, and it ate 💅.

💅 SEE ALSO 💅

The Kernel file ./drivers/scsi/libfc/fc_exch.c is the main character here, and it brought the whole squad 👑:

Source/version and date, cute sign-off style: ./drivers/scsi/libfc, October 2026. Bye bestie, go read that kernel file 💜.

📦 where this page comes from

nixpkgs unstable: linux-manual 7.3.1
💖 girlified by deepseek-ai/DeepSeek-V4.1-Flash-1017 on 2026-11-04: a language model's rewrite of the original, under its terms

STRUCT FC_EXCH_POOL(9)