diff options
Diffstat (limited to 'fs/btrfs/messages.h')
| -rw-r--r-- | fs/btrfs/messages.h | 188 |
1 files changed, 93 insertions, 95 deletions
diff --git a/fs/btrfs/messages.h b/fs/btrfs/messages.h index 08a9272399d2..022ebc89af85 100644 --- a/fs/btrfs/messages.h +++ b/fs/btrfs/messages.h @@ -4,6 +4,7 @@ #define BTRFS_MESSAGES_H #include <linux/types.h> +#include <linux/types.h> #include <linux/printk.h> #include <linux/bug.h> @@ -36,106 +37,46 @@ void _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...); btrfs_no_printk(fs_info, fmt, ##args) #endif -#define btrfs_emerg(fs_info, fmt, args...) \ - btrfs_printk(fs_info, KERN_EMERG fmt, ##args) -#define btrfs_alert(fs_info, fmt, args...) \ - btrfs_printk(fs_info, KERN_ALERT fmt, ##args) -#define btrfs_crit(fs_info, fmt, args...) \ - btrfs_printk(fs_info, KERN_CRIT fmt, ##args) -#define btrfs_err(fs_info, fmt, args...) \ - btrfs_printk(fs_info, KERN_ERR fmt, ##args) -#define btrfs_warn(fs_info, fmt, args...) \ - btrfs_printk(fs_info, KERN_WARNING fmt, ##args) -#define btrfs_notice(fs_info, fmt, args...) \ - btrfs_printk(fs_info, KERN_NOTICE fmt, ##args) -#define btrfs_info(fs_info, fmt, args...) \ - btrfs_printk(fs_info, KERN_INFO fmt, ##args) - /* - * Wrappers that use printk_in_rcu + * Print a message with filesystem info, enclosed in RCU protection. */ -#define btrfs_emerg_in_rcu(fs_info, fmt, args...) \ - btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args) -#define btrfs_alert_in_rcu(fs_info, fmt, args...) \ - btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args) -#define btrfs_crit_in_rcu(fs_info, fmt, args...) \ +#define btrfs_crit(fs_info, fmt, args...) \ btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args) -#define btrfs_err_in_rcu(fs_info, fmt, args...) \ +#define btrfs_err(fs_info, fmt, args...) \ btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args) -#define btrfs_warn_in_rcu(fs_info, fmt, args...) \ +#define btrfs_warn(fs_info, fmt, args...) \ btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args) -#define btrfs_notice_in_rcu(fs_info, fmt, args...) \ - btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args) -#define btrfs_info_in_rcu(fs_info, fmt, args...) \ +#define btrfs_info(fs_info, fmt, args...) \ btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args) /* - * Wrappers that use a ratelimited printk_in_rcu - */ -#define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \ - btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args) -#define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \ - btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args) -#define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \ - btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args) -#define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \ - btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args) -#define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \ - btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args) -#define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \ - btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args) -#define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \ - btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args) - -/* * Wrappers that use a ratelimited printk */ -#define btrfs_emerg_rl(fs_info, fmt, args...) \ - btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args) -#define btrfs_alert_rl(fs_info, fmt, args...) \ - btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args) #define btrfs_crit_rl(fs_info, fmt, args...) \ - btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args) + btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args) #define btrfs_err_rl(fs_info, fmt, args...) \ - btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args) + btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args) #define btrfs_warn_rl(fs_info, fmt, args...) \ - btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args) -#define btrfs_notice_rl(fs_info, fmt, args...) \ - btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args) + btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args) #define btrfs_info_rl(fs_info, fmt, args...) \ - btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args) + btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args) #if defined(CONFIG_DYNAMIC_DEBUG) #define btrfs_debug(fs_info, fmt, args...) \ - _dynamic_func_call_no_desc(fmt, btrfs_printk, \ - fs_info, KERN_DEBUG fmt, ##args) -#define btrfs_debug_in_rcu(fs_info, fmt, args...) \ _dynamic_func_call_no_desc(fmt, btrfs_printk_in_rcu, \ fs_info, KERN_DEBUG fmt, ##args) -#define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \ - _dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu, \ - fs_info, KERN_DEBUG fmt, ##args) #define btrfs_debug_rl(fs_info, fmt, args...) \ - _dynamic_func_call_no_desc(fmt, btrfs_printk_ratelimited, \ + _dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu, \ fs_info, KERN_DEBUG fmt, ##args) #elif defined(DEBUG) #define btrfs_debug(fs_info, fmt, args...) \ - btrfs_printk(fs_info, KERN_DEBUG fmt, ##args) -#define btrfs_debug_in_rcu(fs_info, fmt, args...) \ btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args) -#define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \ - btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args) #define btrfs_debug_rl(fs_info, fmt, args...) \ - btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args) + btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args) #else -#define btrfs_debug(fs_info, fmt, args...) \ - btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args) -#define btrfs_debug_in_rcu(fs_info, fmt, args...) \ - btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args) -#define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \ - btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args) -#define btrfs_debug_rl(fs_info, fmt, args...) \ - btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args) +/* When printk() is no_printk(), expand to no-op. */ +#define btrfs_debug(fs_info, fmt, args...) do { (void)(fs_info); } while(0) +#define btrfs_debug_rl(fs_info, fmt, args...) do { (void)(fs_info); } while(0) #endif #define btrfs_printk_in_rcu(fs_info, fmt, args...) \ @@ -145,40 +86,97 @@ do { \ rcu_read_unlock(); \ } while (0) -#define btrfs_no_printk_in_rcu(fs_info, fmt, args...) \ -do { \ - rcu_read_lock(); \ - btrfs_no_printk(fs_info, fmt, ##args); \ - rcu_read_unlock(); \ -} while (0) - -#define btrfs_printk_ratelimited(fs_info, fmt, args...) \ +#define btrfs_printk_rl_in_rcu(fs_info, fmt, args...) \ do { \ static DEFINE_RATELIMIT_STATE(_rs, \ DEFAULT_RATELIMIT_INTERVAL, \ DEFAULT_RATELIMIT_BURST); \ + \ + rcu_read_lock(); \ if (__ratelimit(&_rs)) \ btrfs_printk(fs_info, fmt, ##args); \ -} while (0) - -#define btrfs_printk_rl_in_rcu(fs_info, fmt, args...) \ -do { \ - rcu_read_lock(); \ - btrfs_printk_ratelimited(fs_info, fmt, ##args); \ rcu_read_unlock(); \ } while (0) #ifdef CONFIG_BTRFS_ASSERT -#define btrfs_assertfail(expr, file, line) ({ \ - pr_err("assertion failed: %s, in %s:%d\n", (expr), (file), (line)); \ - BUG(); \ -}) +__printf(1, 2) +static inline void verify_assert_printk_format(const char *fmt, ...) { + /* Stub to verify the assertion format string. */ +} + +/* Take the first token if any. */ +#define __FIRST_ARG(_, ...) _ +/* + * Skip the first token and return the rest, if it's empty the comma is dropped. + * As ##__VA_ARGS__ cannot be at the beginning of the macro the __VA_OPT__ is needed + * and supported since GCC 8 and Clang 12. + */ +#define __REST_ARGS(_, ... ) __VA_OPT__(,) __VA_ARGS__ + +#if defined(CONFIG_CC_IS_CLANG) || GCC_VERSION >= 80000 +/* + * Assertion with optional printk() format. + * + * Accepted syntax: + * ASSERT(condition); + * ASSERT(condition, "string"); + * ASSERT(condition, "variable=%d", variable); + * + * How it works: + * - if there's no format string, ""[0] evaluates at compile time to 0 and the + * true branch is executed + * - any non-empty format string with the "" prefix evaluates to != 0 at + * compile time and the false branch is executed + * - stringified condition is printed as %s so we don't accidentally mix format + * strings (the % operator) + * - there can be only one printk() call, so the format strings and arguments are + * spliced together: + * DEFAULT_FMT [USER_FMT], DEFAULT_ARGS [, USER_ARGS] + * - comma between DEFAULT_ARGS and USER_ARGS is handled by preprocessor + * (requires __VA_OPT__ support) + * - otherwise we could use __VA_OPT(,) __VA_ARGS__ for the 2nd+ argument of args, + */ +#define ASSERT(cond, args...) \ +do { \ + verify_assert_printk_format("check the format string" args); \ + if (!likely(cond)) { \ + if (("" __FIRST_ARG(args) [0]) == 0) { \ + pr_err("assertion failed: %s :: %ld, in %s:%d\n", \ + #cond, (long)(cond), __FILE__, __LINE__); \ + } else { \ + pr_err("assertion failed: %s :: %ld, in %s:%d (" __FIRST_ARG(args) ")\n", \ + #cond, (long)(cond), __FILE__, __LINE__ __REST_ARGS(args)); \ + } \ + BUG(); \ + } \ +} while(0) + +#else + +/* For GCC < 8.x only the simple output. */ + +#define ASSERT(cond, args...) \ +do { \ + verify_assert_printk_format("check the format string" args); \ + if (!likely(cond)) { \ + pr_err("assertion failed: %s :: %ld, in %s:%d\n", \ + #cond, (long)(cond), __FILE__, __LINE__); \ + BUG(); \ + } \ +} while(0) + +#endif + +#else +#define ASSERT(cond, args...) (void)(cond) +#endif -#define ASSERT(expr) \ - (likely(expr) ? (void)0 : btrfs_assertfail(#expr, __FILE__, __LINE__)) +#ifdef CONFIG_BTRFS_DEBUG +/* Verbose warning only under debug build. */ +#define DEBUG_WARN(args...) WARN(1, KERN_ERR args) #else -#define ASSERT(expr) (void)(expr) +#define DEBUG_WARN(...) do {} while(0) #endif __printf(5, 6) |