STRUCT UBIFS_CH(9)

🦋 struct ubifs_ch(9) — the Kernel API Manual glow-up 🦋

okay so bestie, welcome to the struct ubifs_ch(9) page ✨ this is a Kernel API Manual moment and honestly? it's giving "small but powerful." let's get into it 💅

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✨ NAME ✨

struct ubifs_ch — the common header node. yeah. it's the little header that every UBIFS node carries around, like a tiny crown 👑 no cap.

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🌸 SYNOPSIS 🌸

struct ubifs_ch {
    __le32 magic;
    __le32 crc;
    __le64 sqnum;
    __le32 len;
    __u8 node_type;
    __u8 group_type;
    __u8 padding[2];
 };

literally copy that exactly pls, don't come for me about the spacing, that's what the source says 🫶

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💖 Members 💖

so here's the cast of this struct — each field is kinda a main character in its own right:

• magic — the UBIFS node magic number (UBIFS_NODE_MAGIC). it's the ✨vibe check✨ of the node, the thing that says "hi, I'm a UBIFS node."
• crc — CRC-32 checksum of the node header. your little integrity bestie, keeping things from going off the rails 🔥
• sqnum — sequence number. the order tracker, the "who goes first" of it all 🌈
• len — full node length. like, the whole node, not just this header, okay? full. length. periodt.
• node_type — node type. what kind of node are we even dealing with? iykyk.
• group_type — node group type. it's the node type's bestie, they hang out together 💜
• padding — reserved for future, zeroes. it's empty space but make it fashion — literally just zeroes holding a spot for someday 🎀

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🧚 Description 🧚

so the way this works is: every single UBIFS node starts with this common part. like, all of them. it's the universal intro, the opening number if you will 💅

and if the node has a key? the key always goes next. right after. no skipping ahead, no cutting in line — the key knows its place 🦋

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⭐ SEE ALSO ⭐

go check out the Kernel file ./fs/ubifs/ubifs-media.h for the source-of-truth realness, plus all these siblings:

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_branch(9), struct ubifs_idx_node(9), struct ubifs_cs_node(9), struct ubifs_orph_node(9)

like, the whole extended family fr fr 💀

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ok that's the whole page, no notes 🙈 every field, every name, all accounted for. slay.

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💖 that's a wrap bestie 💖 this manual page is from ./fs/ubifs and it's dated October 2026 — so it's basically a little time capsule from the future, and honestly? the future is iconic 👑✨ bye! 🎀