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 */
27 typedef int (*dbg_leaf_callback)(struct ubifs_info *c,
28 				 struct ubifs_zbranch *zbr, void *priv);
29 typedef 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  */
87 struct 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  */
142 struct 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 void ubifs_assert_failed(struct ubifs_info *c, const char *expr,
152 	const char *file, int line);
153 
154 #define ubifs_assert(c, expr) do {                                             \
155 	if (unlikely(!(expr))) {                                               \
156 		ubifs_assert_failed((struct ubifs_info *)c, #expr, __FILE__,   \
157 		 __LINE__);                                                    \
158 	}                                                                      \
159 } while (0)
160 
161 #define ubifs_assert_cmt_locked(c) do {                                        \
162 	if (unlikely(down_write_trylock(&(c)->commit_sem))) {                  \
163 		up_write(&(c)->commit_sem);                                    \
164 		ubifs_err(c, "commit lock is not locked!\n");                  \
165 		ubifs_assert(c, 0);                                            \
166 	}                                                                      \
167 } while (0)
168 
169 #define ubifs_dbg_msg(type, fmt, ...) \
170 	pr_debug("UBIFS DBG " type " (pid %d): " fmt "\n", current->pid,       \
171 		 ##__VA_ARGS__)
172 
173 #define DBG_KEY_BUF_LEN 48
174 #define ubifs_dbg_msg_key(type, key, fmt, ...) do {                            \
175 	char __tmp_key_buf[DBG_KEY_BUF_LEN];                                   \
176 	pr_debug("UBIFS DBG " type " (pid %d): " fmt "%s\n", current->pid,     \
177 		 ##__VA_ARGS__,                                                \
178 		 dbg_snprintf_key(c, key, __tmp_key_buf, DBG_KEY_BUF_LEN));    \
179 } while (0)
180 
181 /* General messages */
182 #define dbg_gen(fmt, ...)   ubifs_dbg_msg("gen", fmt, ##__VA_ARGS__)
183 /* Additional journal messages */
184 #define dbg_jnl(fmt, ...)   ubifs_dbg_msg("jnl", fmt, ##__VA_ARGS__)
185 #define dbg_jnlk(key, fmt, ...) \
186 	ubifs_dbg_msg_key("jnl", key, fmt, ##__VA_ARGS__)
187 /* Additional TNC messages */
188 #define dbg_tnc(fmt, ...)   ubifs_dbg_msg("tnc", fmt, ##__VA_ARGS__)
189 #define dbg_tnck(key, fmt, ...) \
190 	ubifs_dbg_msg_key("tnc", key, fmt, ##__VA_ARGS__)
191 /* Additional lprops messages */
192 #define dbg_lp(fmt, ...)    ubifs_dbg_msg("lp", fmt, ##__VA_ARGS__)
193 /* Additional LEB find messages */
194 #define dbg_find(fmt, ...)  ubifs_dbg_msg("find", fmt, ##__VA_ARGS__)
195 /* Additional mount messages */
196 #define dbg_mnt(fmt, ...)   ubifs_dbg_msg("mnt", fmt, ##__VA_ARGS__)
197 #define dbg_mntk(key, fmt, ...) \
198 	ubifs_dbg_msg_key("mnt", key, fmt, ##__VA_ARGS__)
199 /* Additional I/O messages */
200 #define dbg_io(fmt, ...)    ubifs_dbg_msg("io", fmt, ##__VA_ARGS__)
201 /* Additional commit messages */
202 #define dbg_cmt(fmt, ...)   ubifs_dbg_msg("cmt", fmt, ##__VA_ARGS__)
203 /* Additional budgeting messages */
204 #define dbg_budg(fmt, ...)  ubifs_dbg_msg("budg", fmt, ##__VA_ARGS__)
205 /* Additional log messages */
206 #define dbg_log(fmt, ...)   ubifs_dbg_msg("log", fmt, ##__VA_ARGS__)
207 /* Additional gc messages */
208 #define dbg_gc(fmt, ...)    ubifs_dbg_msg("gc", fmt, ##__VA_ARGS__)
209 /* Additional scan messages */
210 #define dbg_scan(fmt, ...)  ubifs_dbg_msg("scan", fmt, ##__VA_ARGS__)
211 /* Additional recovery messages */
212 #define dbg_rcvry(fmt, ...) ubifs_dbg_msg("rcvry", fmt, ##__VA_ARGS__)
213 
214 extern struct ubifs_global_debug_info ubifs_dbg;
215 
dbg_is_chk_gen(const struct ubifs_info * c)216 static inline int dbg_is_chk_gen(const struct ubifs_info *c)
217 {
218 	return !!(ubifs_dbg.chk_gen || c->dbg->chk_gen);
219 }
dbg_is_chk_index(const struct ubifs_info * c)220 static inline int dbg_is_chk_index(const struct ubifs_info *c)
221 {
222 	return !!(ubifs_dbg.chk_index || c->dbg->chk_index);
223 }
dbg_is_chk_orph(const struct ubifs_info * c)224 static inline int dbg_is_chk_orph(const struct ubifs_info *c)
225 {
226 	return !!(ubifs_dbg.chk_orph || c->dbg->chk_orph);
227 }
dbg_is_chk_lprops(const struct ubifs_info * c)228 static inline int dbg_is_chk_lprops(const struct ubifs_info *c)
229 {
230 	return !!(ubifs_dbg.chk_lprops || c->dbg->chk_lprops);
231 }
dbg_is_chk_fs(const struct ubifs_info * c)232 static inline int dbg_is_chk_fs(const struct ubifs_info *c)
233 {
234 	return !!(ubifs_dbg.chk_fs || c->dbg->chk_fs);
235 }
dbg_is_tst_rcvry(const struct ubifs_info * c)236 static inline int dbg_is_tst_rcvry(const struct ubifs_info *c)
237 {
238 	return !!(ubifs_dbg.tst_rcvry || c->dbg->tst_rcvry);
239 }
dbg_is_power_cut(const struct ubifs_info * c)240 static inline int dbg_is_power_cut(const struct ubifs_info *c)
241 {
242 	return !!c->dbg->pc_happened;
243 }
244 
245 int ubifs_debugging_init(struct ubifs_info *c);
246 void ubifs_debugging_exit(struct ubifs_info *c);
247 
248 /* Dump functions */
249 const char *dbg_ntype(int type);
250 const char *dbg_cstate(int cmt_state);
251 const char *dbg_jhead(int jhead);
252 const char *dbg_get_key_dump(const struct ubifs_info *c,
253 			     const union ubifs_key *key);
254 const char *dbg_snprintf_key(const struct ubifs_info *c,
255 			     const union ubifs_key *key, char *buffer, int len);
256 void ubifs_dump_inode(struct ubifs_info *c, const struct inode *inode);
257 void ubifs_dump_node(const struct ubifs_info *c, const void *node);
258 void ubifs_dump_budget_req(const struct ubifs_budget_req *req);
259 void ubifs_dump_lstats(const struct ubifs_lp_stats *lst);
260 void ubifs_dump_budg(struct ubifs_info *c, const struct ubifs_budg_info *bi);
261 void ubifs_dump_lprop(const struct ubifs_info *c,
262 		      const struct ubifs_lprops *lp);
263 void ubifs_dump_lprops(struct ubifs_info *c);
264 void ubifs_dump_lpt_info(struct ubifs_info *c);
265 void ubifs_dump_leb(const struct ubifs_info *c, int lnum);
266 void ubifs_dump_sleb(const struct ubifs_info *c,
267 		     const struct ubifs_scan_leb *sleb, int offs);
268 void ubifs_dump_znode(const struct ubifs_info *c,
269 		      const struct ubifs_znode *znode);
270 void ubifs_dump_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap,
271 		     int cat);
272 void ubifs_dump_pnode(struct ubifs_info *c, struct ubifs_pnode *pnode,
273 		      struct ubifs_nnode *parent, int iip);
274 void ubifs_dump_tnc(struct ubifs_info *c);
275 void ubifs_dump_index(struct ubifs_info *c);
276 void ubifs_dump_lpt_lebs(const struct ubifs_info *c);
277 
278 int dbg_walk_index(struct ubifs_info *c, dbg_leaf_callback leaf_cb,
279 		   dbg_znode_callback znode_cb, void *priv);
280 
281 /* Checking functions */
282 void dbg_save_space_info(struct ubifs_info *c);
283 int dbg_check_space_info(struct ubifs_info *c);
284 int dbg_check_lprops(struct ubifs_info *c);
285 int dbg_old_index_check_init(struct ubifs_info *c, struct ubifs_zbranch *zroot);
286 int dbg_check_old_index(struct ubifs_info *c, struct ubifs_zbranch *zroot);
287 int dbg_check_cats(struct ubifs_info *c);
288 int dbg_check_ltab(struct ubifs_info *c);
289 int dbg_chk_lpt_free_spc(struct ubifs_info *c);
290 int dbg_chk_lpt_sz(struct ubifs_info *c, int action, int len);
291 int dbg_check_synced_i_size(const struct ubifs_info *c, struct inode *inode);
292 int dbg_check_dir(struct ubifs_info *c, const struct inode *dir);
293 int dbg_check_tnc(struct ubifs_info *c, int extra);
294 int dbg_check_idx_size(struct ubifs_info *c, long long idx_size);
295 int dbg_check_filesystem(struct ubifs_info *c);
296 void dbg_check_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap, int cat,
297 		    int add_pos);
298 int dbg_check_lpt_nodes(struct ubifs_info *c, struct ubifs_cnode *cnode,
299 			int row, int col);
300 int dbg_check_inode_size(struct ubifs_info *c, const struct inode *inode,
301 			 loff_t size);
302 int dbg_check_data_nodes_order(struct ubifs_info *c, struct list_head *head);
303 int dbg_check_nondata_nodes_order(struct ubifs_info *c, struct list_head *head);
304 
305 int dbg_leb_write(struct ubifs_info *c, int lnum, const void *buf, int offs,
306 		  int len);
307 int dbg_leb_change(struct ubifs_info *c, int lnum, const void *buf, int len);
308 int dbg_leb_unmap(struct ubifs_info *c, int lnum);
309 int dbg_leb_map(struct ubifs_info *c, int lnum);
310 
311 /* Debugfs-related stuff */
312 int dbg_debugfs_init(void);
313 void dbg_debugfs_exit(void);
314 int dbg_debugfs_init_fs(struct ubifs_info *c);
315 void dbg_debugfs_exit_fs(struct ubifs_info *c);
316 
317 #endif /* !__UBIFS_DEBUG_H__ */
318