Re: [PATCH] Btrfs: add support for asserts

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> With this we can
> go through and convert any BUG_ON()'s that we have to catch actual programming
> mistakes to the new ASSERT() and then fix everybody else to return errors.

I like the sound of that!

> --- a/fs/btrfs/ctree.h
> +++ b/fs/btrfs/ctree.h
> @@ -3814,6 +3814,22 @@ void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
>  #define btrfs_debug(fs_info, fmt, args...) \
>  	btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
>  
> +#ifdef BTRFS_ASSERT
> +
> +static inline void assfail(char *expr, char *file, int lin)
> +{
> +	printk(KERN_ERR "BTRFS assertion failed: %s, file: %s, line: %d",
> +	       expr, file, line);
> +	BUG();
> +}

I'm not sure why this is needed.

> +#define ASSERT(expr)	\
> +	(unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))

(Passing the assertion is unlikely()?  I know, this is from xfs...
still.)

> +#else
> +#define ASSERT(expr)	((void)0)
> +#endif

Anyway, if you're going to do it this way, why not:

	#ifdef BTRFS_ASSERT
	#define btrfs_assert(cond)  BUG_ON(!(cond))
	#else
	#define btrfs_assert(cond)  do { if (cond) ; } while (0)
	#endif

?

- z
--
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