linux/fs/ubifs/debug.h
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   1/*
   2 * This file is part of UBIFS.
   3 *
   4 * Copyright (C) 2006-2008 Nokia Corporation.
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms of the GNU General Public License version 2 as published by
   8 * the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful, but WITHOUT
  11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13 * more details.
  14 *
  15 * You should have received a copy of the GNU General Public License along with
  16 * this program; if not, write to the Free Software Foundation, Inc., 51
  17 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  18 *
  19 * Authors: Artem Bityutskiy (Битюцкий Артём)
  20 *          Adrian Hunter
  21 */
  22
  23#ifndef __UBIFS_DEBUG_H__
  24#define __UBIFS_DEBUG_H__
  25
  26/* Checking helper functions */
  27typedef int (*dbg_leaf_callback)(struct ubifs_info *c,
  28                                 struct ubifs_zbranch *zbr, void *priv);
  29typedef int (*dbg_znode_callback)(struct ubifs_info *c,
  30                                  struct ubifs_znode *znode, void *priv);
  31
  32/*
  33 * The UBIFS debugfs directory name pattern and maximum name length (3 for "ubi"
  34 * + 1 for "_" and plus 2x2 for 2 UBI numbers and 1 for the trailing zero byte.
  35 */
  36#define UBIFS_DFS_DIR_NAME "ubi%d_%d"
  37#define UBIFS_DFS_DIR_LEN  (3 + 1 + 2*2 + 1)
  38
  39/**
  40 * ubifs_debug_info - per-FS debugging information.
  41 * @old_zroot: old index root - used by 'dbg_check_old_index()'
  42 * @old_zroot_level: old index root level - used by 'dbg_check_old_index()'
  43 * @old_zroot_sqnum: old index root sqnum - used by 'dbg_check_old_index()'
  44 *
  45 * @pc_happened: non-zero if an emulated power cut happened
  46 * @pc_delay: 0=>don't delay, 1=>delay a time, 2=>delay a number of calls
  47 * @pc_timeout: time in jiffies when delay of failure mode expires
  48 * @pc_cnt: current number of calls to failure mode I/O functions
  49 * @pc_cnt_max: number of calls by which to delay failure mode
  50 *
  51 * @chk_lpt_sz: used by LPT tree size checker
  52 * @chk_lpt_sz2: used by LPT tree size checker
  53 * @chk_lpt_wastage: used by LPT tree size checker
  54 * @chk_lpt_lebs: used by LPT tree size checker
  55 * @new_nhead_offs: used by LPT tree size checker
  56 * @new_ihead_lnum: used by debugging to check @c->ihead_lnum
  57 * @new_ihead_offs: used by debugging to check @c->ihead_offs
  58 *
  59 * @saved_lst: saved lprops statistics (used by 'dbg_save_space_info()')
  60 * @saved_bi: saved budgeting information
  61 * @saved_free: saved amount of free space
  62 * @saved_idx_gc_cnt: saved value of @c->idx_gc_cnt
  63 *
  64 * @chk_gen: if general extra checks are enabled
  65 * @chk_index: if index xtra checks are enabled
  66 * @chk_orph: if orphans extra checks are enabled
  67 * @chk_lprops: if lprops extra checks are enabled
  68 * @chk_fs: if UBIFS contents extra checks are enabled
  69 * @tst_rcvry: if UBIFS recovery testing mode enabled
  70 *
  71 * @dfs_dir_name: name of debugfs directory containing this file-system's files
  72 * @dfs_dir: direntry object of the file-system debugfs directory
  73 * @dfs_dump_lprops: "dump lprops" debugfs knob
  74 * @dfs_dump_budg: "dump budgeting information" debugfs knob
  75 * @dfs_dump_tnc: "dump TNC" debugfs knob
  76 * @dfs_chk_gen: debugfs knob to enable UBIFS general extra checks
  77 * @dfs_chk_index: debugfs knob to enable UBIFS index extra checks
  78 * @dfs_chk_orph: debugfs knob to enable UBIFS orphans extra checks
  79 * @dfs_chk_lprops: debugfs knob to enable UBIFS LEP properties extra checks
  80 * @dfs_chk_fs: debugfs knob to enable UBIFS contents extra checks
  81 * @dfs_tst_rcvry: debugfs knob to enable UBIFS recovery testing
  82 * @dfs_ro_error: debugfs knob to switch UBIFS to R/O mode (different to
  83 *                re-mounting to R/O mode because it does not flush any buffers
  84 *                and UBIFS just starts returning -EROFS on all write
  85 *               operations)
  86 */
  87struct ubifs_debug_info {
  88        struct ubifs_zbranch old_zroot;
  89        int old_zroot_level;
  90        unsigned long long old_zroot_sqnum;
  91
  92        int pc_happened;
  93        int pc_delay;
  94        unsigned long pc_timeout;
  95        unsigned int pc_cnt;
  96        unsigned int pc_cnt_max;
  97
  98        long long chk_lpt_sz;
  99        long long chk_lpt_sz2;
 100        long long chk_lpt_wastage;
 101        int chk_lpt_lebs;
 102        int new_nhead_offs;
 103        int new_ihead_lnum;
 104        int new_ihead_offs;
 105
 106        struct ubifs_lp_stats saved_lst;
 107        struct ubifs_budg_info saved_bi;
 108        long long saved_free;
 109        int saved_idx_gc_cnt;
 110
 111        unsigned int chk_gen:1;
 112        unsigned int chk_index:1;
 113        unsigned int chk_orph:1;
 114        unsigned int chk_lprops:1;
 115        unsigned int chk_fs:1;
 116        unsigned int tst_rcvry:1;
 117
 118        char dfs_dir_name[UBIFS_DFS_DIR_LEN + 1];
 119        struct dentry *dfs_dir;
 120        struct dentry *dfs_dump_lprops;
 121        struct dentry *dfs_dump_budg;
 122        struct dentry *dfs_dump_tnc;
 123        struct dentry *dfs_chk_gen;
 124        struct dentry *dfs_chk_index;
 125        struct dentry *dfs_chk_orph;
 126        struct dentry *dfs_chk_lprops;
 127        struct dentry *dfs_chk_fs;
 128        struct dentry *dfs_tst_rcvry;
 129        struct dentry *dfs_ro_error;
 130};
 131
 132/**
 133 * ubifs_global_debug_info - global (not per-FS) UBIFS debugging information.
 134 *
 135 * @chk_gen: if general extra checks are enabled
 136 * @chk_index: if index xtra checks are enabled
 137 * @chk_orph: if orphans extra checks are enabled
 138 * @chk_lprops: if lprops extra checks are enabled
 139 * @chk_fs: if UBIFS contents extra checks are enabled
 140 * @tst_rcvry: if UBIFS recovery testing mode enabled
 141 */
 142struct ubifs_global_debug_info {
 143        unsigned int chk_gen:1;
 144        unsigned int chk_index:1;
 145        unsigned int chk_orph:1;
 146        unsigned int chk_lprops:1;
 147        unsigned int chk_fs:1;
 148        unsigned int tst_rcvry:1;
 149};
 150
 151#define ubifs_assert(expr) do {                                                \
 152        if (unlikely(!(expr))) {                                               \
 153                pr_crit("UBIFS assert failed in %s at %u (pid %d)\n",          \
 154                       __func__, __LINE__, current->pid);                      \
 155                dump_stack();                                                  \
 156        }                                                                      \
 157} while (0)
 158
 159#define ubifs_assert_cmt_locked(c) do {                                        \
 160        if (unlikely(down_write_trylock(&(c)->commit_sem))) {                  \
 161                up_write(&(c)->commit_sem);                                    \
 162                pr_crit("commit lock is not locked!\n");                       \
 163                ubifs_assert(0);                                               \
 164        }                                                                      \
 165} while (0)
 166
 167#define ubifs_dbg_msg(type, fmt, ...) \
 168        pr_debug("UBIFS DBG " type " (pid %d): " fmt "\n", current->pid,       \
 169                 ##__VA_ARGS__)
 170
 171#define DBG_KEY_BUF_LEN 48
 172#define ubifs_dbg_msg_key(type, key, fmt, ...) do {                            \
 173        char __tmp_key_buf[DBG_KEY_BUF_LEN];                                   \
 174        pr_debug("UBIFS DBG " type " (pid %d): " fmt "%s\n", current->pid,     \
 175                 ##__VA_ARGS__,                                                \
 176                 dbg_snprintf_key(c, key, __tmp_key_buf, DBG_KEY_BUF_LEN));    \
 177} while (0)
 178
 179/* General messages */
 180#define dbg_gen(fmt, ...)   ubifs_dbg_msg("gen", fmt, ##__VA_ARGS__)
 181/* Additional journal messages */
 182#define dbg_jnl(fmt, ...)   ubifs_dbg_msg("jnl", fmt, ##__VA_ARGS__)
 183#define dbg_jnlk(key, fmt, ...) \
 184        ubifs_dbg_msg_key("jnl", key, fmt, ##__VA_ARGS__)
 185/* Additional TNC messages */
 186#define dbg_tnc(fmt, ...)   ubifs_dbg_msg("tnc", fmt, ##__VA_ARGS__)
 187#define dbg_tnck(key, fmt, ...) \
 188        ubifs_dbg_msg_key("tnc", key, fmt, ##__VA_ARGS__)
 189/* Additional lprops messages */
 190#define dbg_lp(fmt, ...)    ubifs_dbg_msg("lp", fmt, ##__VA_ARGS__)
 191/* Additional LEB find messages */
 192#define dbg_find(fmt, ...)  ubifs_dbg_msg("find", fmt, ##__VA_ARGS__)
 193/* Additional mount messages */
 194#define dbg_mnt(fmt, ...)   ubifs_dbg_msg("mnt", fmt, ##__VA_ARGS__)
 195#define dbg_mntk(key, fmt, ...) \
 196        ubifs_dbg_msg_key("mnt", key, fmt, ##__VA_ARGS__)
 197/* Additional I/O messages */
 198#define dbg_io(fmt, ...)    ubifs_dbg_msg("io", fmt, ##__VA_ARGS__)
 199/* Additional commit messages */
 200#define dbg_cmt(fmt, ...)   ubifs_dbg_msg("cmt", fmt, ##__VA_ARGS__)
 201/* Additional budgeting messages */
 202#define dbg_budg(fmt, ...)  ubifs_dbg_msg("budg", fmt, ##__VA_ARGS__)
 203/* Additional log messages */
 204#define dbg_log(fmt, ...)   ubifs_dbg_msg("log", fmt, ##__VA_ARGS__)
 205/* Additional gc messages */
 206#define dbg_gc(fmt, ...)    ubifs_dbg_msg("gc", fmt, ##__VA_ARGS__)
 207/* Additional scan messages */
 208#define dbg_scan(fmt, ...)  ubifs_dbg_msg("scan", fmt, ##__VA_ARGS__)
 209/* Additional recovery messages */
 210#define dbg_rcvry(fmt, ...) ubifs_dbg_msg("rcvry", fmt, ##__VA_ARGS__)
 211
 212extern struct ubifs_global_debug_info ubifs_dbg;
 213
 214static inline int dbg_is_chk_gen(const struct ubifs_info *c)
 215{
 216        return !!(ubifs_dbg.chk_gen || c->dbg->chk_gen);
 217}
 218static inline int dbg_is_chk_index(const struct ubifs_info *c)
 219{
 220        return !!(ubifs_dbg.chk_index || c->dbg->chk_index);
 221}
 222static inline int dbg_is_chk_orph(const struct ubifs_info *c)
 223{
 224        return !!(ubifs_dbg.chk_orph || c->dbg->chk_orph);
 225}
 226static inline int dbg_is_chk_lprops(const struct ubifs_info *c)
 227{
 228        return !!(ubifs_dbg.chk_lprops || c->dbg->chk_lprops);
 229}
 230static inline int dbg_is_chk_fs(const struct ubifs_info *c)
 231{
 232        return !!(ubifs_dbg.chk_fs || c->dbg->chk_fs);
 233}
 234static inline int dbg_is_tst_rcvry(const struct ubifs_info *c)
 235{
 236        return !!(ubifs_dbg.tst_rcvry || c->dbg->tst_rcvry);
 237}
 238static inline int dbg_is_power_cut(const struct ubifs_info *c)
 239{
 240        return !!c->dbg->pc_happened;
 241}
 242
 243int ubifs_debugging_init(struct ubifs_info *c);
 244void ubifs_debugging_exit(struct ubifs_info *c);
 245
 246/* Dump functions */
 247const char *dbg_ntype(int type);
 248const char *dbg_cstate(int cmt_state);
 249const char *dbg_jhead(int jhead);
 250const char *dbg_get_key_dump(const struct ubifs_info *c,
 251                             const union ubifs_key *key);
 252const char *dbg_snprintf_key(const struct ubifs_info *c,
 253                             const union ubifs_key *key, char *buffer, int len);
 254void ubifs_dump_inode(struct ubifs_info *c, const struct inode *inode);
 255void ubifs_dump_node(const struct ubifs_info *c, const void *node);
 256void ubifs_dump_budget_req(const struct ubifs_budget_req *req);
 257void ubifs_dump_lstats(const struct ubifs_lp_stats *lst);
 258void ubifs_dump_budg(struct ubifs_info *c, const struct ubifs_budg_info *bi);
 259void ubifs_dump_lprop(const struct ubifs_info *c,
 260                      const struct ubifs_lprops *lp);
 261void ubifs_dump_lprops(struct ubifs_info *c);
 262void ubifs_dump_lpt_info(struct ubifs_info *c);
 263void ubifs_dump_leb(const struct ubifs_info *c, int lnum);
 264void ubifs_dump_sleb(const struct ubifs_info *c,
 265                     const struct ubifs_scan_leb *sleb, int offs);
 266void ubifs_dump_znode(const struct ubifs_info *c,
 267                      const struct ubifs_znode *znode);
 268void ubifs_dump_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap,
 269                     int cat);
 270void ubifs_dump_pnode(struct ubifs_info *c, struct ubifs_pnode *pnode,
 271                      struct ubifs_nnode *parent, int iip);
 272void ubifs_dump_tnc(struct ubifs_info *c);
 273void ubifs_dump_index(struct ubifs_info *c);
 274void ubifs_dump_lpt_lebs(const struct ubifs_info *c);
 275
 276int dbg_walk_index(struct ubifs_info *c, dbg_leaf_callback leaf_cb,
 277                   dbg_znode_callback znode_cb, void *priv);
 278
 279/* Checking functions */
 280void dbg_save_space_info(struct ubifs_info *c);
 281int dbg_check_space_info(struct ubifs_info *c);
 282int dbg_check_lprops(struct ubifs_info *c);
 283int dbg_old_index_check_init(struct ubifs_info *c, struct ubifs_zbranch *zroot);
 284int dbg_check_old_index(struct ubifs_info *c, struct ubifs_zbranch *zroot);
 285int dbg_check_cats(struct ubifs_info *c);
 286int dbg_check_ltab(struct ubifs_info *c);
 287int dbg_chk_lpt_free_spc(struct ubifs_info *c);
 288int dbg_chk_lpt_sz(struct ubifs_info *c, int action, int len);
 289int dbg_check_synced_i_size(const struct ubifs_info *c, struct inode *inode);
 290int dbg_check_dir(struct ubifs_info *c, const struct inode *dir);
 291int dbg_check_tnc(struct ubifs_info *c, int extra);
 292int dbg_check_idx_size(struct ubifs_info *c, long long idx_size);
 293int dbg_check_filesystem(struct ubifs_info *c);
 294void dbg_check_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap, int cat,
 295                    int add_pos);
 296int dbg_check_lpt_nodes(struct ubifs_info *c, struct ubifs_cnode *cnode,
 297                        int row, int col);
 298int dbg_check_inode_size(struct ubifs_info *c, const struct inode *inode,
 299                         loff_t size);
 300int dbg_check_data_nodes_order(struct ubifs_info *c, struct list_head *head);
 301int dbg_check_nondata_nodes_order(struct ubifs_info *c, struct list_head *head);
 302
 303int dbg_leb_write(struct ubifs_info *c, int lnum, const void *buf, int offs,
 304                  int len);
 305int dbg_leb_change(struct ubifs_info *c, int lnum, const void *buf, int len);
 306int dbg_leb_unmap(struct ubifs_info *c, int lnum);
 307int dbg_leb_map(struct ubifs_info *c, int lnum);
 308
 309/* Debugfs-related stuff */
 310int dbg_debugfs_init(void);
 311void dbg_debugfs_exit(void);
 312int dbg_debugfs_init_fs(struct ubifs_info *c);
 313void dbg_debugfs_exit_fs(struct ubifs_info *c);
 314
 315#endif /* !__UBIFS_DEBUG_H__ */
 316
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