STRUCT UBIFS_DEBUG_INFO(9)

💖 struct ubifs_debug_info(9) 💖

okay so this is the Kernel API Manual page for struct ubifs_debug_info, and it is literally per-FS debugging information. group chat, but kernel edition 🫶

💖 NAME 💖

struct ubifs_debug_info — per-FS debugging information. periodt ✨

✨ SYNOPSIS ✨

here is the whole struct, bestie — every field stays exactly as it is, no cap 💅

struct ubifs_debug_info {
    struct ubifs_zbranch old_zroot;
    int old_zroot_level;
    unsigned long long old_zroot_sqnum;
    int pc_happened;
    int pc_delay;
    unsigned long pc_timeout;
    unsigned int pc_cnt;
    unsigned int pc_cnt_max;
    long long chk_lpt_sz;
    long long chk_lpt_sz2;
    long long chk_lpt_wastage;
    int chk_lpt_lebs;
    int new_nhead_offs;
    int new_ihead_lnum;
    int new_ihead_offs;
    struct ubifs_lp_stats saved_lst;
    struct ubifs_budg_info saved_bi;
    long long saved_free;
    int saved_idx_gc_cnt;
    unsigned int chk_gen:1;
    unsigned int chk_index:1;
    unsigned int chk_orph:1;
    unsigned int chk_lprops:1;
    unsigned int chk_fs:1;
    unsigned int tst_rcvry:1;
    char dfs_dir_name[UBIFS_DFS_DIR_LEN];
    struct dentry *dfs_dir;
    struct dentry *dfs_dump_lprops;
    struct dentry *dfs_dump_budg;
    struct dentry *dfs_dump_tnc;
    struct dentry *dfs_chk_gen;
    struct dentry *dfs_chk_index;
    struct dentry *dfs_chk_orph;
    struct dentry *dfs_chk_lprops;
    struct dentry *dfs_chk_fs;
    struct dentry *dfs_tst_rcvry;
    struct dentry *dfs_ro_error;
};

🫶 Members 🫶

okay bestie, meet the whole cast in order — every single one is iconic in its own little kernel way 🌸

• old_zroot — old index root — used by dbg_check_old_index 👑
• old_zroot_level — old index root level — used by dbg_check_old_index ✨
• old_zroot_sqnum — old index root sqnum — used by dbg_check_old_index 💫
• pc_happened — non-zero if an emulated power cut happened ⚡
• pc_delay — 0=>don't delay, 1=>delay a time, 2=>delay a number of calls 🕰️
• pc_timeout — time in jiffies when delay of failure mode expires ⏳
• pc_cnt — current number of calls to failure mode I/O functions 🔁
• pc_cnt_max — number of calls by which to delay failure mode 🎚️
• chk_lpt_sz — used by LPT tree size checker 🌳
• chk_lpt_sz2 — used by LPT tree size checker 🌳
• chk_lpt_wastage — used by LPT tree size checker 🌳
• chk_lpt_lebs — used by LPT tree size checker 🌳
• new_nhead_offs — used by LPT tree size checker 🌳
• new_ihead_lnum — used by debugging to check c->ihead_lnum 🔍
• new_ihead_offs — used by debugging to check c->ihead_offs 🔍
• saved_lst — saved lprops statistics (used by dbg_save_space_info) 💾
• saved_bi — saved budgeting information 💾
• saved_free — saved amount of free space 💾
• saved_idx_gc_cnt — saved value of c->idx_gc_cnt 💾
• chk_gen — if general extra checks are enabled ✅
• chk_index — if index xtra checks are enabled ✅
• chk_orph — if orphans extra checks are enabled ✅
• chk_lprops — if lprops extra checks are enabled ✅
• chk_fs — if UBIFS contents extra checks are enabled ✅
• tst_rcvry — if UBIFS recovery testing mode enabled ✅
• dfs_dir_name — name of debugfs directory containing this file-system's files 📁
• dfs_dir — direntry object of the file-system debugfs directory 📂
• dfs_dump_lprops — "dump lprops" debugfs knob 🎛️
• dfs_dump_budg — "dump budgeting information" debugfs knob 🎛️
• dfs_dump_tnc — "dump TNC" debugfs knob 🎛️
• dfs_chk_gen — debugfs knob to enable UBIFS general extra checks 🎛️
• dfs_chk_index — debugfs knob to enable UBIFS index extra checks 🎛️
• dfs_chk_orph — debugfs knob to enable UBIFS orphans extra checks 🎛️
• dfs_chk_lprops — debugfs knob to enable UBIFS LEP properties extra checks 🎛️
• dfs_chk_fs — debugfs knob to enable UBIFS contents extra checks 🎛️
• dfs_tst_rcvry — debugfs knob to enable UBIFS recovery testing 🎛️
• dfs_ro_error — debugfs knob to switch UBIFS to R/O mode (different to re-mounting to R/O mode because it does not flush any buffers and UBIFS just starts returning -EROFS on all write operations) 🚨

🌈 SEE ALSO 🌈

• Kernel file ./fs/ubifs/debug.h, plus struct ubifs_global_debug_info(9) 🦋

byeee 💜 this page came from ./fs/ubifs, dated October 2026, and it is all about struct ubifs_debug_info(9) — mwah 💋