STRUCT NILFS_SUSTAT(9)

✨ struct nilfs_sustat(9) ✨

okay bestie, welcome to the Kernel API Manual page for struct nilfs_sustat(9) — a.k.a. the literal vibe check for your segments 💅 no cap, this page is short but she's iconic.

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🌸 NAME 🌸

struct nilfs_sustat — segment usage statistics 🎀

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⭐ SYNOPSIS ⭐

here's the whole struct, copy it exactly bestie, don't you dare retype it from memory:

struct nilfs_sustat {
    __u64 ss_nsegs;
    __u64 ss_ncleansegs;
    __u64 ss_ndirtysegs;
    __u64 ss_ctime;
    __u64 ss_nongc_ctime;
    __u64 ss_prot_seq;
 };

(it's giving six __u64 fields and zero filler, we love a concise queen 👑)

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🦋 Members 🦋

so like, field by field, here we go:

• ss_nsegs — the number of segments. that's it, that's the count 🍓
• ss_ncleansegs — number of clean segments. freshly scrubbed, dewy, main character energy ✨
• ss_ndirtysegs — number of dirty segments. not her finest era but we still respect her 💀
• ss_ctime — creation time of the last segment 🕐 (yes, the last one specifically, don't @ me)
• ss_nongc_ctime — creation time of the last segment not for GC 🧚 lowkey an important distinction, iykyk
• ss_prot_seq — least sequence number of segments which must not be reclaimed 🙈 like, hands off, these ones are protected, periodt

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💜 SEE ALSO 💜

go read these next, bestie, they're all in it together — Kernel file ./include/uapi/linux/nilfs2_api.h, plus:

• struct nilfs_cpinfo(9)
• struct nilfs_suinfo(9)
• struct nilfs_suinfo_update(9)
• struct nilfs_cpmode(9)
• struct nilfs_argv(9)
• struct nilfs_period(9)
• struct nilfs_cpstat(9)
• struct nilfs_vinfo(9)
• struct nilfs_vdesc(9)
• struct nilfs_bdesc(9)

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ngl the whole squad lives in ./include/uapi/linux so you already know where to find them 🫶

okay that's the page!! huge shoutout to the source ./include/uapi/linux, dated October 2026 — thanks for the lore drop, mwah 💖 and remember: struct nilfs_sustat(9) ate and left no crumbs 🌈