text: /*
   * This file is part of UBIFS.
   *
   * Copyright (C) 2006-2008 Nokia Corporation.
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published by
   * the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   * more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program; if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
   *
   * Authors: Artem Bityutskiy (Битюцкий Артём)
   *          Adrian Hunter
   */
  
  #ifndef __UBIFS_DEBUG_H__
  #define __UBIFS_DEBUG_H__
  
  /* Checking helper functions */
  typedef int (*dbg_leaf_callback)(struct ubifs_info *c,
  				 struct ubifs_zbranch *zbr, void *priv);
  typedef int (*dbg_znode_callback)(struct ubifs_info *c,
  				  struct ubifs_znode *znode, void *priv);
  
  /*
   * The UBIFS debugfs directory name pattern and maximum name length (3 for "ubi"
   * + 1 for "_" and plus 2x2 for 2 UBI numbers and 1 for the trailing zero byte.
   */
  #define UBIFS_DFS_DIR_NAME "ubi%d_%d"
  #define UBIFS_DFS_DIR_LEN  (3 + 1 + 2*2 + 1)
  
  /**
   * ubifs_debug_info - per-FS debugging information.
   * @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)
   */
  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 + 1];
  	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;
  	struct dentry *dfs_lca_debug;
  	struct dentry *dfs_lca_show_tnc;
  	struct dentry *dfs_wbuf_count;
  	struct dentry *dfs_host_wcount;
  };
  
  /**
   * ubifs_global_debug_info - global (not per-FS) UBIFS debugging information.
   *
   * @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
   */
  struct ubifs_global_debug_info {
  	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;
  };
  
  /**
   * ubifs_global_debug_tnc - global (not per-FS) UBIFS debugging tnc information.
   *
   */
  struct ubifs_global_debug_tnc {
  	unsigned int total_ubifs_volume;
  	uint32_t total_znode;
  	uint32_t total_tnc_leaf_lens;
  	uint32_t total_clean_znode;
  	uint32_t total_clean_tnc_leaf_lens;
  };
  
  #define ubifs_assert(expr) do {                                                \
  	if (unlikely(!(expr))) {                                               \
  		pr_crit("UBIFS assert failed in %s at %u (pid %d)\n",          \
  		       __func__, __LINE__, current->pid);                      \
  		show_stack(NULL, NULL);                                                  \
  	}                                                                      \
  } while (0)
  
  #define ubifs_assert_cmt_locked(c) do {                                        \
  	if (unlikely(down_write_trylock(&(c)->commit_sem))) {                  \
  		up_write(&(c)->commit_sem);                                    \
  		pr_crit("commit lock is not locked!\n");                       \
  		ubifs_assert(0);                                               \
  	}                                                                      \
  } while (0)
  
  #define ubifs_dbg_msg(type, fmt, ...) \
  	pr_debug("UBIFS DBG " type " (pid %d): " fmt "\n", current->pid,       \
  		 ##__VA_ARGS__)
  
  #define DBG_KEY_BUF_LEN 48
  #define ubifs_dbg_msg_key(type, key, fmt, ...) do {                            \
  	char __tmp_key_buf[DBG_KEY_BUF_LEN];                                   \
  	pr_debug("UBIFS DBG " type " (pid %d): " fmt "%s\n", current->pid,     \
  		 ##__VA_ARGS__,                                                \
  		 dbg_snprintf_key(c, key, __tmp_key_buf, DBG_KEY_BUF_LEN));    \
  } while (0)
  
  /* General messages */
  #define dbg_gen(fmt, ...)   ubifs_dbg_msg("gen", fmt, ##__VA_ARGS__)
  /* Additional journal messages */
  #define dbg_jnl(fmt, ...)   ubifs_dbg_msg("jnl", fmt, ##__VA_ARGS__)
  #define dbg_jnlk(key, fmt, ...) \
  	ubifs_dbg_msg_key("jnl", key, fmt, ##__VA_ARGS__)
  /* Additional TNC messages */
  #define dbg_tnc(fmt, ...)   ubifs_dbg_msg("tnc", fmt, ##__VA_ARGS__)
  #define dbg_tnck(key, fmt, ...) \
  	ubifs_dbg_msg_key("tnc", key, fmt, ##__VA_ARGS__)
  /* Additional lprops messages */
  #define dbg_lp(fmt, ...)    ubifs_dbg_msg("lp", fmt, ##__VA_ARGS__)
  /* Additional LEB find messages */
  #define dbg_find(fmt, ...)  ubifs_dbg_msg("find", fmt, ##__VA_ARGS__)
  /* Additional mount messages */
  #define dbg_mnt(fmt, ...)   ubifs_dbg_msg("mnt", fmt, ##__VA_ARGS__)
  #define dbg_mntk(key, fmt, ...) \
  	ubifs_dbg_msg_key("mnt", key, fmt, ##__VA_ARGS__)
  /* Additional I/O messages */
  #define dbg_io(fmt, ...)    ubifs_dbg_msg("io", fmt, ##__VA_ARGS__)
  /* Additional commit messages */
  #define dbg_cmt(fmt, ...)   ubifs_dbg_msg("cmt", fmt, ##__VA_ARGS__)
  /* Additional budgeting messages */
  #define dbg_budg(fmt, ...)  ubifs_dbg_msg("budg", fmt, ##__VA_ARGS__)
  /* Additional log messages */
  #define dbg_log(fmt, ...)   ubifs_dbg_msg("log", fmt, ##__VA_ARGS__)
  /* Additional gc messages */
  #define dbg_gc(fmt, ...)    ubifs_dbg_msg("gc", fmt, ##__VA_ARGS__)
  /* Additional scan messages */
  #define dbg_scan(fmt, ...)  ubifs_dbg_msg("scan", fmt, ##__VA_ARGS__)
  /* Additional recovery messages */
  #define dbg_rcvry(fmt, ...) ubifs_dbg_msg("rcvry", fmt, ##__VA_ARGS__)
  
  extern struct ubifs_global_debug_info ubifs_dbg;
  
  static inline int dbg_is_chk_gen(const struct ubifs_info *c)
  {
  	return !!(ubifs_dbg.chk_gen || c->dbg->chk_gen);
  }
  static inline int dbg_is_chk_index(const struct ubifs_info *c)
  {
  	return !!(ubifs_dbg.chk_index || c->dbg->chk_index);
  }
  static inline int dbg_is_chk_orph(const struct ubifs_info *c)
  {
  	return !!(ubifs_dbg.chk_orph || c->dbg->chk_orph);
  }
  static inline int dbg_is_chk_lprops(const struct ubifs_info *c)
  {
  	return !!(ubifs_dbg.chk_lprops || c->dbg->chk_lprops);
  }
  static inline int dbg_is_chk_fs(const struct ubifs_info *c)
  {
  	return !!(ubifs_dbg.chk_fs || c->dbg->chk_fs);
  }
  static inline int dbg_is_tst_rcvry(const struct ubifs_info *c)
  {
  	return !!(ubifs_dbg.tst_rcvry || c->dbg->tst_rcvry);
  }
  static inline int dbg_is_power_cut(const struct ubifs_info *c)
  {
  	return !!c->dbg->pc_happened;
  }
  
  int ubifs_debugging_init(struct ubifs_info *c);
  void ubifs_debugging_exit(struct ubifs_info *c);
  
  /* Dump functions */
  const char *dbg_ntype(int type);
  const char *dbg_cstate(int cmt_state);
  const char *dbg_jhead(int jhead);
  const char *dbg_get_key_dump(const struct ubifs_info *c,
  			     const union ubifs_key *key);
  const char *dbg_snprintf_key(const struct ubifs_info *c,
  			     const union ubifs_key *key, char *buffer, int len);
  void ubifs_dump_inode(struct ubifs_info *c, const struct inode *inode);
  void ubifs_dump_node(const struct ubifs_info *c, const void *node);
  void ubifs_dump_budget_req(const struct ubifs_budget_req *req);
  void ubifs_dump_lstats(const struct ubifs_lp_stats *lst);
  void ubifs_dump_budg(struct ubifs_info *c, const struct ubifs_budg_info *bi);
  void ubifs_dump_lprop(const struct ubifs_info *c,
  		      const struct ubifs_lprops *lp);
  void ubifs_dump_lprops(struct ubifs_info *c);
  void ubifs_dump_lpt_info(struct ubifs_info *c);
  void ubifs_dump_leb(const struct ubifs_info *c, int lnum);
  void ubifs_dump_sleb(const struct ubifs_info *c,
  		     const struct ubifs_scan_leb *sleb, int offs);
  void ubifs_dump_znode(const struct ubifs_info *c,
  		      const struct ubifs_znode *znode);
  void ubifs_dump_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap,
  		     int cat);
  void ubifs_dump_pnode(struct ubifs_info *c, struct ubifs_pnode *pnode,
  		      struct ubifs_nnode *parent, int iip);
  void ubifs_dump_tnc(struct ubifs_info *c);
  void ubifs_dump_index(struct ubifs_info *c);
  void ubifs_dump_lpt_lebs(const struct ubifs_info *c);
  
  int dbg_walk_index(struct ubifs_info *c, dbg_leaf_callback leaf_cb,
  		   dbg_znode_callback znode_cb, void *priv);
  
  /* Checking functions */
  void dbg_save_space_info(struct ubifs_info *c);
  int dbg_check_space_info(struct ubifs_info *c);
  int dbg_check_lprops(struct ubifs_info *c);
  int dbg_old_index_check_init(struct ubifs_info *c, struct ubifs_zbranch *zroot);
  int dbg_check_old_index(struct ubifs_info *c, struct ubifs_zbranch *zroot);
  int dbg_check_cats(struct ubifs_info *c);
  int dbg_check_ltab(struct ubifs_info *c);
  int dbg_chk_lpt_free_spc(struct ubifs_info *c);
  int dbg_chk_lpt_sz(struct ubifs_info *c, int action, int len);
  int dbg_check_synced_i_size(const struct ubifs_info *c, struct inode *inode);
  int dbg_check_dir(struct ubifs_info *c, const struct inode *dir);
  int dbg_check_tnc(struct ubifs_info *c, int extra);
  int dbg_check_idx_size(struct ubifs_info *c, long long idx_size);
  int dbg_check_filesystem(struct ubifs_info *c);
  void dbg_check_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap, int cat,
  		    int add_pos);
  int dbg_check_lpt_nodes(struct ubifs_info *c, struct ubifs_cnode *cnode,
  			int row, int col);
  int dbg_check_inode_size(struct ubifs_info *c, const struct inode *inode,
  			 loff_t size);
  int dbg_check_data_nodes_order(struct ubifs_info *c, struct list_head *head);
  int dbg_check_nondata_nodes_order(struct ubifs_info *c, struct list_head *head);
  
  int dbg_leb_write(struct ubifs_info *c, int lnum, const void *buf, int offs,
  		  int len);
  int dbg_leb_change(struct ubifs_info *c, int lnum, const void *buf, int len);
  int dbg_leb_unmap(struct ubifs_info *c, int lnum);
  int dbg_leb_map(struct ubifs_info *c, int lnum);
  
  /* Debugfs-related stuff */
  int dbg_debugfs_init(void);
  void dbg_debugfs_exit(void);
  int dbg_debugfs_init_fs(struct ubifs_info *c);
  void dbg_debugfs_exit_fs(struct ubifs_info *c);
  
  #endif /* !__UBIFS_DEBUG_H__ */
  