STRUCT ESW2(9)

✨ struct esw2 💅

okay so bestie, this is a page from the Kernel API Manual and it's literally all about struct esw2 — the Format 2 Extended Status Word, aka ESW 🎀. iykyk, s390 girlies stay winning.

🌸 SYNOPSIS 🌸

struct esw2 {
    __u8 zero0;
    __u8 lpum;
    __u16 dcti;
    struct erw erw;
    __u32 zeros[3];
 };

no cap, that's the whole shape of it. iconic layout, honestly 🫶

💖 Members 💖

• zero0 — reserved zeros, bestie. it's giving "just vibes, no data" ✨
• lpum — the last path used mask. yes queen, tell us which path you used last 💅
• dcti — the device-connect-time interval. the way that time just… connects 🕰️
• erw — the extended report word. this is the main character of the struct, fr fr 👑
• zeros — three fullwords of zeros. three. whole. words. of nothing. we love a humble icon 🙈

🦋 SEE ALSO 🦋

Kernel file ./arch/s390/include/asm/cio.h — plus these absolute legends:

• struct ccw1(9)
• struct ccw0(9)
• struct erw(9)
• struct erw_eadm(9)
• struct sublog(9)
• struct esw0(9)
• struct esw1(9)
• struct esw3(9)
• struct esw_eadm(9)
• struct irb(9)
• struct ciw(9)
• struct ccw_dev_id(9)
• ccw_dev_id_is_equal(9)
• pathmask_to_pos(9)

like, the whole friend group showed up 🌈💜 go read them too, they ate 🔥

okay that's the page!! mwah 💋 this one came from ./arch/s390/include/asm and it's dated October 2026, and the page itself is struct esw2(9) — periodt, go slay your kernel hacking bestie ⭐🧚