STRUCT NILFS_BTREE_PATH(9)

💅 struct nilfs_btree_path(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ today we're decoding struct nilfs_btree_path and honestly? she's kind of a main character.

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🌸 NAME 🌸

struct nilfs_btree_path — a path on which B-tree operations are executed

like, literally the lil walkway the B-tree does its whole thing on 🫶 no cap.

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✨ SYNOPSIS ✨

struct nilfs_btree_path {
    struct buffer_head *bp_bh;
    struct buffer_head *bp_sib_bh;
    int bp_index;
    union nilfs_bmap_ptr_req bp_oldreq;
    union nilfs_bmap_ptr_req bp_newreq;
    struct nilfs_btnode_chkey_ctxt bp_ctxt;
    void (*bp_op)(struct nilfs_bmap *, struct nilfs_btree_path *, int,
__u64 *, __u64 *);
 };

copy this exactly or the compiler WILL humble you 😭

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🎀 Members 🎀

• bp_bh — buffer head of node block 💖 the actual block she's standing on
• bp_sib_bh — buffer head of sibling node block 🦋 that's her sibling's block, keeping it in the family
• bp_index — index of child node 🌸 which child we're pointing at, an int, very demure
• bp_oldreq — ptr end request for old ptr 👑 the wrap-up request for the old pointer (a union nilfs_bmap_ptr_req)
• bp_newreq — ptr alloc request for new ptr ⭐ the alloc request for the new pointer (also a union nilfs_bmap_ptr_req)
• bp_ctxt — context information for changing the key of a b-tree node block 🔥 it's giving "hold my metadata", it's a struct nilfs_btnode_chkey_ctxt
• bp_op — rebalance operation 💅 a function pointer, signature void (*)(struct nilfs_bmap *, struct nilfs_btree_path *, int, __u64 *, __u64 *) — yes she takes all of that, and yes she ate

ngl the function pointer in the synopsis wraps onto a second line with __u64 *, __u64 *); and an extra space before the closing brace — that's just how it's printed, don't come for me 🙈

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🌈 SEE ALSO 🌈

• Kernel file ./fs/nilfs2/btree.h — go read her, she's iconic, iykyk 📖

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okay that's the whole page, mwah 💋 this cutie pie comes from ./fs/nilfs2, dated October 2026, and lives in the Kernel API Manual — go forth and traverse responsibly bestie 🧚‍♀️💜