STRUCT UBIFS_BRANCH(9)

💅 struct ubifs_branch(9) — the Kernel API Manual, bestie edition ✨

okay so this is a page straight out of the Kernel API Manual and it's literally about struct ubifs_branch — the key/reference/length branch of the UBIFS world 👑 tiny struct, big main character energy.

---

✨ NAME ✨

struct ubifs_branch — it's giving key/reference/length branch 🎀 that's the whole vibe, no cap.

---

🌸 SYNOPSIS 🌸

like, here's the literal glow-up of the struct, copy it exactly please 🫶

struct ubifs_branch {
    __le32 lnum;
    __le32 offs;
    __le32 len;
    __u8 key[];
};

---

💖 Members 💖

bestie these are the members, do not lose a single one:

• lnum — the LEB number of the target node 🔥 (yes, that LEB)
• offs — the offset, but like… within lnum 📍
• len — the target node length, periodt 💅
• key — the key 🗝️ literally just the key

---

🦋 Description 🦋

so in an authenticated UBIFS we have the hash of the referenced node sitting after key 👀 — and the way that this can't be added to the struct type definition is because key is already a dynamically sized element 😭 like it's fully booked, no room, the audacity.

---

🌈 SEE ALSO 🌈

the whole friend group, all from the kernel file ./fs/ubifs/ubifs-media.h:

• struct ubifs_ch(9)
• union ubifs_dev_desc(9)
• struct ubifs_ino_node(9)
• struct ubifs_dent_node(9)
• struct ubifs_data_node(9)
• struct ubifs_trun_node(9)
• struct ubifs_pad_node(9)
• struct ubifs_sb_node(9)
• struct ubifs_mst_node(9)
• struct ubifs_ref_node(9)
• struct ubifs_auth_node(9)
• struct ubifs_sig_node(9)
• struct ubifs_idx_node(9)
• struct ubifs_cs_node(9)
• struct ubifs_orph_node(9)

like, that's the entire squad 🫶✨

---

aaaand that's the page, diva 💜 sign-off time: this lil gem lives at ./fs/ubifs, dated October 2026, and it's filed under struct ubifs_branch(9) — slay, go read the source, iykyk 🌸🎀