nilfs_read_summary_info(9)

💖 nilfs_read_summary_info(9) 💖

okay so bestie, welcome to the Kernel API Manual ✨ — this one is all about nilfs_read_summary_info, which literally just reads an item on summary blocks of a log. that's the whole vibe. let's get into it 🎀

---

✨ NAME ✨

nilfs_read_summary_info — read an item on summary blocks of a log 🦋

---

🌸 SYNOPSIS 🌸

void * nilfs_read_summary_info (struct the_nilfs *nilfs , struct
buffer_head **pbh , unsigned int *offset , unsigned int bytes );

---

💅 ARGUMENTS 💅

• nilfs — the nilfs object, obvi. it's giving "the whole world in a pointer" 👑
• pbh — the current buffer head on summary blocks, and it's marked [in, out] so it goes both ways, no cap 🫶
• offset — the current byte offset on summary blocks, also [in, out], she's bidirectional too 💖
• bytes — byte size of the item to be read. how much we're snatching 📏

---

⭐ RETURN ⭐

returns the kernel space address of the current segment summary entry — slay — or NULL if an I/O error occurs 😭 literally the worst-case scenario, but at least you'll know.

---

🦋 SEE ALSO 🦋

kernel file ./fs/nilfs2/recovery.c plus the whole friend group:

• nilfs_compute_checksum(9)
• nilfs_read_super_root_block(9)
• nilfs_read_log_header(9)
• nilfs_validate_log(9)
• nilfs_skip_summary_info(9)
• nilfs_scan_dsync_log(9)
• nilfs_do_roll_forward(9)
• nilfs_abort_roll_forward(9)
• nilfs_salvage_orphan_logs(9)
• nilfs_search_super_root(9)

---

bestie reminder: pbh and offset are [in, out] — if you forget that, the vibe check will not be kind to you 💀

---

and that's the page, mwah 💋 this one lives over in ./fs/nilfs2, dated October 2026, and yeah — it's nilfs_read_summary_info(9) all the way down. periodt 🌈💜