STRUCT NILFS_BTREE_NODE(9)

🦋 struct nilfs_btree_node(9) 🦋

okay so bestie, welcome to the struct nilfs_btree_node(9) page from the Kernel API Manual — yes it's a manual page, yes it's about kernel internals, and yes we are going to make it cute. This one is short and sweet, no cap. 💅

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✨ NAME ✨

struct nilfs_btree_node — the header of a B-tree node block. That's it, that's the whole vibe. It's the little header chilling at the top of a node block, like the name tag at a party but for kernel data structures. 🎀

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🌸 SYNOPSIS 🌸

here's the whole struct, exactly as it lives, don't touch the formatting bestie:

struct nilfs_btree_node {
    __u8 bn_flags;
    __u8 bn_level;
    __le16 bn_nchildren;
    __le32 bn_pad;
 };

look at that. four fields. immaculate. 🫶

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💖 Members 💖

let's meet the cast, one by one:

• bn_flags — flags. yep, that's the description. iconic brevity, honestly. 🎀
• bn_level — level. (the struct said what it said and we respect it ✨)
• bn_nchildren — the number of children. so this one actually tells you something: how many children this node has. slay. 🌸
• bn_pad — padding. the little spacer that keeps everything aligned and looking right. we love a struct that pads. 💅

ngl, some of these descriptions are giving "one-word answer on a test" energy, but we keep every single detail exactly as written because the facts do not change. periodt. 🔥

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👑 SEE ALSO 👑

the whole friend group lives in the kernel file ./include/uapi/linux/nilfs2_ondisk.h, and here's everyone you should also go say hi to:

• struct nilfs_inode(9)
• struct nilfs_super_root(9)
• struct nilfs_super_block(9)
• struct nilfs_finfo(9)
• struct nilfs_binfo_v(9)
• struct nilfs_binfo_dat(9)
• union nilfs_binfo(9)
• struct nilfs_segment_summary(9)
• struct nilfs_direct_node(9)
• struct nilfs_palloc_group_desc(9)
• struct nilfs_dat_entry(9)
• struct nilfs_snapshot_list(9)
• struct nilfs_checkpoint(9)
• struct nilfs_cpfile_header(9)
• struct nilfs_segment_usage(9)
• struct nilfs_sufile_header(9)

like, that's a whole ensemble cast, and they're all under ./include/uapi/linux — iykyk. 🌈

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aaaand that's the page! sign-off time: this lil beauty ships from ./include/uapi/linux, dated October 2026, and it's forever known as struct nilfs_btree_node(9). go forth and read your B-tree node headers, bestie 💜🦋⭐