nilfs_sufile_get_suinfo(9)

💅 nilfs_sufile_get_suinfo(9) — it's giving Kernel API Manual energy

okay bestie, so we're in the Kernel API Manual today and the star of the show is nilfs_sufile_get_suinfo — it's literally the "get segment usage information" girlie ✨ No cap, that's the whole NAME section, and she ate.

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🌸 SYNOPSIS 🌸

ssize_t nilfs_sufile_get_suinfo (struct inode *sufile , __u64 segnum ,
void *buf , unsigned int sisz , size_t nsi );

that's the whole signature, copy it exactly bestie, don't be out here improvising 🫶

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🎀 ARGUMENTS 🎀

like five whole parameters, but they're all icons, let's go through them one by one:

• sufile — the inode of the segment usage file 💖 that's the main character right there
• segnum — the segment number to start looking 👀 like where the search begins, iykyk
• buf — an array of suinfo. that's the output spot, where the info goes to live
• sisz — the byte size of suinfo. yes, bytes. be normal about it 💅
• nsi — the size of the suinfo array. so like, how many of them fit in there

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🔥 RETURN 🔥

so on success? it returns the count of segment usage info items stored in the output buffer — iconic behaviour honestly, it's giving receipts ✨

but if things go sideways, you get one of these negative error codes instead, and they are NOT the vibe:

• -EIO — I/O error (including metadata corruption). yeah. including metadata corruption. that's a whole ⚠️ moment, treat it with respect fr fr
• -ENOMEM — Insufficient memory available 😭 the classic "there is not enough memory" situation, we've all been there

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🦋 SEE ALSO 🦋

okay this list is long and honestly kind of iconic, so here's everything, no skipping, periodt:

• Kernel file ./fs/nilfs2/sufile.c — the source file itself, go read it bestie, it's right there
• struct nilfs_sufile_info(9)
• nilfs_sufile_segment_usage_offset(9)
• nilfs_sufile_get_ncleansegs(9)
• nilfs_sufile_updatev(9)
• nilfs_sufile_set_alloc_range(9)
• nilfs_sufile_alloc(9)
• nilfs_sufile_mark_dirty(9)
• nilfs_sufile_set_segment_usage(9)
• nilfs_sufile_get_stat(9)
• nilfs_sufile_truncate_range(9)
• nilfs_sufile_resize(9)
• nilfs_sufile_set_suinfo(9)
• nilfs_sufile_trim_fs(9)
• nilfs_sufile_read(9)

every single one of them, exactly as written, because we do not gatekeep and we do not paraphrase 🌈

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💀 quick vibe check: this page has no DESCRIPTION section, and that's not me being lazy — that's just genuinely how the original is built. we go NAME → SYNOPSIS → ARGUMENTS → RETURN → SEE ALSO. slay in that exact order, okay?

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and that's the whole page, bestie 💜 this dropped from ./fs/nilfs2 in October 2026, so shoutout to that directory and that month for bringing us this absolute gem 🎀✨ go call it with the right arguments, keep your sisz honest, and if you see -EIO just… breathe. you got this 🫶