nilfs_sufile_alloc(9)

✨ nilfs_sufile_alloc(9) ✨

okay so bestie, welcome to the Kernel API Manual 💅 this one's a lil function from the NILFS2 fam and honestly it's giving "short but iconic." let's get into it 🫶

---

🌸 NAME 🌸

nilfs_sufile_alloc — allocate a segment, that's literally the whole job, and she does it 💖

---

🦋 SYNOPSIS 🦋

int nilfs_sufile_alloc (struct inode *sufile , __u64 *segnump );

---

🎀 ARGUMENTS 🎀

• sufile — the inode of the segment usage file. yes queen, that's the file keeping track of which segments are doing what 🗂️
• segnump — a pointer to the segment number. she's the drop-off spot ✨

---

💜 DESCRIPTION 💜

okay so nilfs_sufile_alloc goes and finds a clean segment and then stores that segment's number right into the place that segnump is pointing at. lowkey simple, highkey essential 🔥 no cap.

---

🌈 RETURN 🌈

she returns 0 on success 💖 and on failure you get one of these negative error codes, and yes they're all a lil dramatic:

• -EIO — I/O error (including metadata corruption 😭💀)
• -ENOMEM — insufficient memory available, the vibes were simply not there 🫠
• -ENOSPC — no clean segment left. none. zero. the shelf is empty bestie 🙈

---

👑 SEE ALSO 👑

• Kernel file ./fs/nilfs2/sufile.c
• 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_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_get_suinfo(9)
• nilfs_sufile_set_suinfo(9)
• nilfs_sufile_trim_fs(9)
• nilfs_sufile_read(9)

ngl, that's a whole friend group of sufile functions and they all ate 💅 go say hi to them.

---

and that's the page bestie!! 🧚 this came out of ./fs/nilfs2, dated October 2026, and it's the nilfs_sufile_alloc(9) moment we all deserved 🌟 mwah, bye! 💖🎀🦋