STRUCT FSCK_INODE(9)

💖 NAME 💖

okay bestie, welcome to the struct fsck_inode(9) page from the Kernel API Manual. This struct is information about an inode used when checking the file-system. That’s the whole vibe: inode receipts for fsck, and we’re obsessed 🫶✨

✨ SYNOPSIS ✨

       struct fsck_inode {
           struct rb_node rb;
           ino_t inum;
           umode_t mode;
           unsigned int nlink;
           unsigned int xattr_cnt;
           int references;
           int calc_cnt;
           long long size;
           unsigned int xattr_sz;
           long long calc_sz;
           long long calc_xcnt;
           long long calc_xsz;
           unsigned int xattr_nms;
           long long calc_xnms;
        };

👑 Members 👑

• rb — link in the RB-tree of inodes 🌳
• inum — inode number 🔢
• mode — inode type, permissions, etc 🎛️
• nlink — inode link count 🔗
• xattr_cnt — count of extended attributes ✨
• references — how many directory/xattr entries refer this inode (calculated while walking the index) 👀
• calc_cnt — for directory inode count of child directories 📁
• size — inode size (read from on-flash inode) 📏
• xattr_sz — summary size of all extended attributes (read from on-flash inode) 🧮
• calc_sz — for directories calculated directory size 📂
• calc_xcnt — count of extended attributes 🔢
• calc_xsz — calculated summary size of all extended attributes 🧾
• xattr_nms — sum of lengths of all extended attribute names belonging to this inode (read from on-flash inode) 🏷️
• calc_xnms — calculated sum of lengths of all extended attribute names 📝

🌈 SEE ALSO 🌈

The SEE ALSO section calls out the kernel file ./fs/ubifs/debug.c, and then the ref squad is literally all of these:

• ubifs_dump_index(9)
• dbg_save_space_info(9)
• dbg_check_space_info(9)
• dbg_check_synced_i_size(9)
• dbg_check_key_order(9)
• dbg_check_znode(9)
• dbg_check_tnc(9)
• dbg_walk_index(9)
• add_size(9)
• dbg_check_idx_size(9)
• struct fsck_data(9)
• add_inode(9)
• search_inode(9)
• read_add_inode(9)
• check_leaf(9)
• free_inodes(9)
• check_inodes(9)
• dbg_check_filesystem(9)
• dbg_check_data_nodes_order(9)
• dbg_check_nondata_nodes_order(9)
• provide_user_output(9)
• interpret_user_input(9)
• dbg_debugfs_init_fs(9)
• dbg_debugfs_exit_fs(9)
• dbg_debugfs_init(9)
• dbg_debugfs_exit(9)
• ubifs_debugging_init(9)
• ubifs_debugging_exit(9)

periodt, that’s the whole list 👑

byeee bestie 💖 — source/version ./fs/ubifs, date October 2026, and this whole page is struct fsck_inode(9). slay and goodbye 🎀