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linux/fs/ubifs/debug.h
Artem Bityutskiy ec06814265 UBIFS: dump the stack on errors in failure mode too 
When UBIFS is in the failure mode (used for power cut emulation testing) we for
some reasons do not dump the stack in many places, e.g., in assertions.
Probably at early days we had too many of them and disabled this to make the
development easier, but then never enabled. Nowadays I sometimes observe
assertion failures during power cut testing, but the useful stackdump is not
printed, which is bad. This patch makes UBIFS always print the stackdump when
debugging is enabled.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-05-13 19:23:56 +03:00

495 lines
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/*
* 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);
#ifdef CONFIG_UBIFS_FS_DEBUG
#include <linux/random.h>
/**
* 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()'
* @failure_mode: failure mode for recovery testing
* @fail_delay: 0=>don't delay, 1=>delay a time, 2=>delay a number of calls
* @fail_timeout: time in jiffies when delay of failure mode expires
* @fail_cnt: current number of calls to failure mode I/O functions
* @fail_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
*
* 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
*/
struct ubifs_debug_info {
struct ubifs_zbranch old_zroot;
int old_zroot_level;
unsigned long long old_zroot_sqnum;
int failure_mode;
int fail_delay;
unsigned long fail_timeout;
unsigned int fail_cnt;
unsigned int fail_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;
char dfs_dir_name[100];
struct dentry *dfs_dir;
struct dentry *dfs_dump_lprops;
struct dentry *dfs_dump_budg;
struct dentry *dfs_dump_tnc;
};
#define ubifs_assert(expr) do { \
if (unlikely(!(expr))) { \
printk(KERN_CRIT "UBIFS assert failed in %s at %u (pid %d)\n", \
__func__, __LINE__, current->pid); \
dbg_dump_stack(); \
} \
} while (0)
#define ubifs_assert_cmt_locked(c) do { \
if (unlikely(down_write_trylock(&(c)->commit_sem))) { \
up_write(&(c)->commit_sem); \
printk(KERN_CRIT "commit lock is not locked!\n"); \
ubifs_assert(0); \
} \
} while (0)
#define dbg_dump_stack() dump_stack()
/* Generic debugging messages */
#define dbg_msg(fmt, ...) do { \
spin_lock(&dbg_lock); \
printk(KERN_DEBUG "UBIFS DBG (pid %d): %s: " fmt "\n", current->pid, \
__func__, ##__VA_ARGS__); \
spin_unlock(&dbg_lock); \
} while (0)
#define dbg_do_msg(typ, fmt, ...) do { \
if (ubifs_msg_flags & typ) \
dbg_msg(fmt, ##__VA_ARGS__); \
} while (0)
#define dbg_err(fmt, ...) do { \
spin_lock(&dbg_lock); \
ubifs_err(fmt, ##__VA_ARGS__); \
spin_unlock(&dbg_lock); \
} while (0)
const char *dbg_key_str0(const struct ubifs_info *c,
const union ubifs_key *key);
const char *dbg_key_str1(const struct ubifs_info *c,
const union ubifs_key *key);
/*
* DBGKEY macros require @dbg_lock to be held, which it is in the dbg message
* macros.
*/
#define DBGKEY(key) dbg_key_str0(c, (key))
#define DBGKEY1(key) dbg_key_str1(c, (key))
/* General messages */
#define dbg_gen(fmt, ...) dbg_do_msg(UBIFS_MSG_GEN, fmt, ##__VA_ARGS__)
/* Additional journal messages */
#define dbg_jnl(fmt, ...) dbg_do_msg(UBIFS_MSG_JNL, fmt, ##__VA_ARGS__)
/* Additional TNC messages */
#define dbg_tnc(fmt, ...) dbg_do_msg(UBIFS_MSG_TNC, fmt, ##__VA_ARGS__)
/* Additional lprops messages */
#define dbg_lp(fmt, ...) dbg_do_msg(UBIFS_MSG_LP, fmt, ##__VA_ARGS__)
/* Additional LEB find messages */
#define dbg_find(fmt, ...) dbg_do_msg(UBIFS_MSG_FIND, fmt, ##__VA_ARGS__)
/* Additional mount messages */
#define dbg_mnt(fmt, ...) dbg_do_msg(UBIFS_MSG_MNT, fmt, ##__VA_ARGS__)
/* Additional I/O messages */
#define dbg_io(fmt, ...) dbg_do_msg(UBIFS_MSG_IO, fmt, ##__VA_ARGS__)
/* Additional commit messages */
#define dbg_cmt(fmt, ...) dbg_do_msg(UBIFS_MSG_CMT, fmt, ##__VA_ARGS__)
/* Additional budgeting messages */
#define dbg_budg(fmt, ...) dbg_do_msg(UBIFS_MSG_BUDG, fmt, ##__VA_ARGS__)
/* Additional log messages */
#define dbg_log(fmt, ...) dbg_do_msg(UBIFS_MSG_LOG, fmt, ##__VA_ARGS__)
/* Additional gc messages */
#define dbg_gc(fmt, ...) dbg_do_msg(UBIFS_MSG_GC, fmt, ##__VA_ARGS__)
/* Additional scan messages */
#define dbg_scan(fmt, ...) dbg_do_msg(UBIFS_MSG_SCAN, fmt, ##__VA_ARGS__)
/* Additional recovery messages */
#define dbg_rcvry(fmt, ...) dbg_do_msg(UBIFS_MSG_RCVRY, fmt, ##__VA_ARGS__)
/*
* Debugging message type flags.
*
* UBIFS_MSG_GEN: general messages
* UBIFS_MSG_JNL: journal messages
* UBIFS_MSG_MNT: mount messages
* UBIFS_MSG_CMT: commit messages
* UBIFS_MSG_FIND: LEB find messages
* UBIFS_MSG_BUDG: budgeting messages
* UBIFS_MSG_GC: garbage collection messages
* UBIFS_MSG_TNC: TNC messages
* UBIFS_MSG_LP: lprops messages
* UBIFS_MSG_IO: I/O messages
* UBIFS_MSG_LOG: log messages
* UBIFS_MSG_SCAN: scan messages
* UBIFS_MSG_RCVRY: recovery messages
*/
enum {
UBIFS_MSG_GEN = 0x1,
UBIFS_MSG_JNL = 0x2,
UBIFS_MSG_MNT = 0x4,
UBIFS_MSG_CMT = 0x8,
UBIFS_MSG_FIND = 0x10,
UBIFS_MSG_BUDG = 0x20,
UBIFS_MSG_GC = 0x40,
UBIFS_MSG_TNC = 0x80,
UBIFS_MSG_LP = 0x100,
UBIFS_MSG_IO = 0x200,
UBIFS_MSG_LOG = 0x400,
UBIFS_MSG_SCAN = 0x800,
UBIFS_MSG_RCVRY = 0x1000,
};
/*
* Debugging check flags.
*
* UBIFS_CHK_GEN: general checks
* UBIFS_CHK_TNC: check TNC
* UBIFS_CHK_IDX_SZ: check index size
* UBIFS_CHK_ORPH: check orphans
* UBIFS_CHK_OLD_IDX: check the old index
* UBIFS_CHK_LPROPS: check lprops
* UBIFS_CHK_FS: check the file-system
*/
enum {
UBIFS_CHK_GEN = 0x1,
UBIFS_CHK_TNC = 0x2,
UBIFS_CHK_IDX_SZ = 0x4,
UBIFS_CHK_ORPH = 0x8,
UBIFS_CHK_OLD_IDX = 0x10,
UBIFS_CHK_LPROPS = 0x20,
UBIFS_CHK_FS = 0x40,
};
/*
* Special testing flags.
*
* UBIFS_TST_RCVRY: failure mode for recovery testing
*/
enum {
UBIFS_TST_RCVRY = 0x4,
};
extern spinlock_t dbg_lock;
extern unsigned int ubifs_msg_flags;
extern unsigned int ubifs_chk_flags;
extern unsigned int ubifs_tst_flags;
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);
void dbg_dump_inode(const struct ubifs_info *c, const struct inode *inode);
void dbg_dump_node(const struct ubifs_info *c, const void *node);
void dbg_dump_lpt_node(const struct ubifs_info *c, void *node, int lnum,
int offs);
void dbg_dump_budget_req(const struct ubifs_budget_req *req);
void dbg_dump_lstats(const struct ubifs_lp_stats *lst);
void dbg_dump_budg(struct ubifs_info *c, const struct ubifs_budg_info *bi);
void dbg_dump_lprop(const struct ubifs_info *c, const struct ubifs_lprops *lp);
void dbg_dump_lprops(struct ubifs_info *c);
void dbg_dump_lpt_info(struct ubifs_info *c);
void dbg_dump_leb(const struct ubifs_info *c, int lnum);
void dbg_dump_znode(const struct ubifs_info *c,
const struct ubifs_znode *znode);
void dbg_dump_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap, int cat);
void dbg_dump_pnode(struct ubifs_info *c, struct ubifs_pnode *pnode,
struct ubifs_nnode *parent, int iip);
void dbg_dump_tnc(struct ubifs_info *c);
void dbg_dump_index(struct ubifs_info *c);
void dbg_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(struct inode *inode);
int dbg_check_dir_size(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);
/* Force the use of in-the-gaps method for testing */
static inline int dbg_force_in_the_gaps_enabled(void)
{
return ubifs_chk_flags & UBIFS_CHK_GEN;
}
int dbg_force_in_the_gaps(void);
/* Failure mode for recovery testing */
#define dbg_failure_mode (ubifs_tst_flags & UBIFS_TST_RCVRY)
#ifndef UBIFS_DBG_PRESERVE_UBI
#define ubi_leb_read dbg_leb_read
#define ubi_leb_write dbg_leb_write
#define ubi_leb_change dbg_leb_change
#define ubi_leb_erase dbg_leb_erase
#define ubi_leb_unmap dbg_leb_unmap
#define ubi_is_mapped dbg_is_mapped
#define ubi_leb_map dbg_leb_map
#endif
int dbg_leb_read(struct ubi_volume_desc *desc, int lnum, char *buf, int offset,
int len, int check);
int dbg_leb_write(struct ubi_volume_desc *desc, int lnum, const void *buf,
int offset, int len, int dtype);
int dbg_leb_change(struct ubi_volume_desc *desc, int lnum, const void *buf,
int len, int dtype);
int dbg_leb_erase(struct ubi_volume_desc *desc, int lnum);
int dbg_leb_unmap(struct ubi_volume_desc *desc, int lnum);
int dbg_is_mapped(struct ubi_volume_desc *desc, int lnum);
int dbg_leb_map(struct ubi_volume_desc *desc, int lnum, int dtype);
static inline int dbg_read(struct ubi_volume_desc *desc, int lnum, char *buf,
int offset, int len)
{
return dbg_leb_read(desc, lnum, buf, offset, len, 0);
}
static inline int dbg_write(struct ubi_volume_desc *desc, int lnum,
const void *buf, int offset, int len)
{
return dbg_leb_write(desc, lnum, buf, offset, len, UBI_UNKNOWN);
}
static inline int dbg_change(struct ubi_volume_desc *desc, int lnum,
const void *buf, int len)
{
return dbg_leb_change(desc, lnum, buf, len, UBI_UNKNOWN);
}
/* 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);
#else /* !CONFIG_UBIFS_FS_DEBUG */
/* Use "if (0)" to make compiler check arguments even if debugging is off */
#define ubifs_assert(expr) do { \
if (0 && (expr)) \
printk(KERN_CRIT "UBIFS assert failed in %s at %u (pid %d)\n", \
__func__, __LINE__, current->pid); \
} while (0)
#define dbg_err(fmt, ...) do { \
if (0) \
ubifs_err(fmt, ##__VA_ARGS__); \
} while (0)
#define dbg_msg(fmt, ...) do { \
if (0) \
printk(KERN_DEBUG "UBIFS DBG (pid %d): %s: " fmt "\n", \
current->pid, __func__, ##__VA_ARGS__); \
} while (0)
#define dbg_dump_stack()
#define ubifs_assert_cmt_locked(c)
#define dbg_gen(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_jnl(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_tnc(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_lp(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_find(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_mnt(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_io(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_cmt(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_budg(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_log(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_gc(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_scan(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define dbg_rcvry(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
#define DBGKEY(key) ((char *)(key))
#define DBGKEY1(key) ((char *)(key))
static inline int ubifs_debugging_init(struct ubifs_info *c) { return 0; }
static inline void ubifs_debugging_exit(struct ubifs_info *c) { return; }
static inline const char *dbg_ntype(int type) { return ""; }
static inline const char *dbg_cstate(int cmt_state) { return ""; }
static inline const char *dbg_jhead(int jhead) { return ""; }
static inline const char *
dbg_get_key_dump(const struct ubifs_info *c,
const union ubifs_key *key) { return ""; }
static inline void dbg_dump_inode(const struct ubifs_info *c,
const struct inode *inode) { return; }
static inline void dbg_dump_node(const struct ubifs_info *c,
const void *node) { return; }
static inline void dbg_dump_lpt_node(const struct ubifs_info *c,
void *node, int lnum,
int offs) { return; }
static inline void
dbg_dump_budget_req(const struct ubifs_budget_req *req) { return; }
static inline void
dbg_dump_lstats(const struct ubifs_lp_stats *lst) { return; }
static inline void
dbg_dump_budg(struct ubifs_info *c,
const struct ubifs_budg_info *bi) { return; }
static inline void dbg_dump_lprop(const struct ubifs_info *c,
const struct ubifs_lprops *lp) { return; }
static inline void dbg_dump_lprops(struct ubifs_info *c) { return; }
static inline void dbg_dump_lpt_info(struct ubifs_info *c) { return; }
static inline void dbg_dump_leb(const struct ubifs_info *c,
int lnum) { return; }
static inline void
dbg_dump_znode(const struct ubifs_info *c,
const struct ubifs_znode *znode) { return; }
static inline void dbg_dump_heap(struct ubifs_info *c,
struct ubifs_lpt_heap *heap,
int cat) { return; }
static inline void dbg_dump_pnode(struct ubifs_info *c,
struct ubifs_pnode *pnode,
struct ubifs_nnode *parent,
int iip) { return; }
static inline void dbg_dump_tnc(struct ubifs_info *c) { return; }
static inline void dbg_dump_index(struct ubifs_info *c) { return; }
static inline void dbg_dump_lpt_lebs(const struct ubifs_info *c) { return; }
static inline int dbg_walk_index(struct ubifs_info *c,
dbg_leaf_callback leaf_cb,
dbg_znode_callback znode_cb,
void *priv) { return 0; }
static inline void dbg_save_space_info(struct ubifs_info *c) { return; }
static inline int dbg_check_space_info(struct ubifs_info *c) { return 0; }
static inline int dbg_check_lprops(struct ubifs_info *c) { return 0; }
static inline int
dbg_old_index_check_init(struct ubifs_info *c,
struct ubifs_zbranch *zroot) { return 0; }
static inline int
dbg_check_old_index(struct ubifs_info *c,
struct ubifs_zbranch *zroot) { return 0; }
static inline int dbg_check_cats(struct ubifs_info *c) { return 0; }
static inline int dbg_check_ltab(struct ubifs_info *c) { return 0; }
static inline int dbg_chk_lpt_free_spc(struct ubifs_info *c) { return 0; }
static inline int dbg_chk_lpt_sz(struct ubifs_info *c,
int action, int len) { return 0; }
static inline int dbg_check_synced_i_size(struct inode *inode) { return 0; }
static inline int dbg_check_dir_size(struct ubifs_info *c,
const struct inode *dir) { return 0; }
static inline int dbg_check_tnc(struct ubifs_info *c, int extra) { return 0; }
static inline int dbg_check_idx_size(struct ubifs_info *c,
long long idx_size) { return 0; }
static inline int dbg_check_filesystem(struct ubifs_info *c) { return 0; }
static inline void dbg_check_heap(struct ubifs_info *c,
struct ubifs_lpt_heap *heap,
int cat, int add_pos) { return; }
static inline int dbg_check_lpt_nodes(struct ubifs_info *c,
struct ubifs_cnode *cnode, int row, int col) { return 0; }
static inline int dbg_check_inode_size(struct ubifs_info *c,
const struct inode *inode,
loff_t size) { return 0; }
static inline int
dbg_check_data_nodes_order(struct ubifs_info *c,
struct list_head *head) { return 0; }
static inline int
dbg_check_nondata_nodes_order(struct ubifs_info *c,
struct list_head *head) { return 0; }
static inline int dbg_force_in_the_gaps(void) { return 0; }
#define dbg_force_in_the_gaps_enabled() 0
#define dbg_failure_mode 0
static inline int dbg_debugfs_init(void) { return 0; }
static inline void dbg_debugfs_exit(void) { return; }
static inline int dbg_debugfs_init_fs(struct ubifs_info *c) { return 0; }
static inline int dbg_debugfs_exit_fs(struct ubifs_info *c) { return 0; }
#endif /* !CONFIG_UBIFS_FS_DEBUG */
#endif /* !__UBIFS_DEBUG_H__ */
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