nilfs_sufile...egment_usage(9)

💅 nilfs_sufile_set_segment_usage(9) — the kernel API manual, bestie edition 🎀

Okay so real talk, we're in the Kernel API Manual, section 9, and today's main character is nilfs_sufile_set_segment_usage. The vibe? You're literally just setting the usage of a segment. That's it. That's the whole function. Slay. ✨

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🦋 NAME 🦋

nilfs_sufile_set_segment_usage — set usage of a segment 💖

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🌸 SYNOPSIS 🌸

int nilfs_sufile_set_segment_usage (struct inode *sufile , __u64 segnum
, unsigned long nblocks , time64_t modtime );

Not me putting the whole signature in a code block so you can copy it exactly, no cap. 🫶

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⭐ ARGUMENTS ⭐

• sufile — inode of segment usage file. yeah, the inode. the segment usage file's whole identity. 👑
• segnum — segment number. which segment we're talking about, bestie. 🔢
• nblocks — number of live blocks in the segment. live blocks!! not dead ones, we don't do those here. 🔥
• modtime — modification time (option). the little optional timestamp moment. ⏰

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🌈 RETURN 🌈

0 on success, or a negative error code on failure. so either it ate and left no crumbs, or it's giving negative error code 😭

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🧚 SEE ALSO 🧚

Kernel file ./fs/nilfs2/sufile.c — the source of truth, iykyk 💜

And the whole friend group, fr fr:

• 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_get_stat(9)
• nilfs_sufile_truncate_range(9)
• nilfs_sufile_resize(9)
• nilfs_sufile_get_suinfo(9)
• nilfs_sufile_set_suinfo(9)
• nilfs_sufile_trim_fs(9)
• nilfs_sufile_read(9)

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lowkey that's the whole page, bestie. go forth and set some segment usage. 💅✨

Sign-off time 🎀 this one's from ./fs/nilfs2, dated October 2026, and it's page nilfs_sufile...egment_usage(9) of the Kernel API Manual — yes the header got a little truncated, she's fine, she's iconic, we don't judge. bye bestie, drink some water 🍓🦋💖