STRUCT NILFS_CPFILE_HEADER(9)

💖 struct nilfs_cpfile_header(9) 💖

okay bestie so this is the Kernel API Manual page for struct nilfs_cpfile_header — literally the checkpoint file header, and it's giving "small struct, big responsibility" energy. it's a tiny little glow-up of a struct and we're gonna walk through it together, no cap 🎀

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✨ NAME ✨

struct nilfs_cpfile_header — the checkpoint file header. that's it, that's the whole vibe. 👑

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🌸 SYNOPSIS 🌸

struct nilfs_cpfile_header {
    __le64 ch_ncheckpoints;
    __le64 ch_nsnapshots;
    struct nilfs_snapshot_list ch_snapshot_list;
};

look at her. three fields. immaculate. 🦋

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🫶 MEMBERS 🫶

so the members, in order, exactly as they appear, let's go:

• ch_ncheckpoints — the number of checkpoints. yes it's a __le64. yes little-endian. we respect the byte order in this house 💅
• ch_nsnapshots — the number of snapshots. also a __le64. she's counting, she's organized, she's iconic.
• ch_snapshot_list — the snapshot list itself, typed as struct nilfs_snapshot_list. it's the friend group chat of snapshots and she's holding it down 🫶

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⭐ SEE ALSO ⭐

the whole extended universe, iykyk — all of these live in the kernel file ./include/uapi/linux/nilfs2_ondisk.h:

• 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_btree_node(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_segment_usage(9)
• struct nilfs_sufile_header(9)

that's sixteen whole references bestie, we read the whole syllabus 📚✨

ngl, if you only remember one thing: this is the checkpoint file header, so go read struct nilfs_checkpoint(9) next. it's literally right there in the list. do it. 🫵

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and that's the page!! no notes, ate, left no crumbs 💅 mwah 💋

little sign-off so you don't forget where this came from: this page lives at ./include/uapi/linux, dated October 2026, and if you ever need to find it again she's filed under struct nilfs_cpfile_header(9). periodt. 🌈👑🎀