linux-kernel - Re: Subject: [PATCH 12/16] Squashfs: header files

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Date:	Wed, 22 Oct 2008 18:13:52 +0200 (CEST)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Phillip Lougher <phillip@...gher.demon.co.uk>
cc:	akpm@...ux-foundation.org, linux-embedded@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	tim.bird@...sony.com
Subject: Re: Subject: [PATCH 12/16] Squashfs: header files

On Fri, 17 Oct 2008, Phillip Lougher wrote:
> --- /dev/null
> +++ b/fs/squashfs/squashfs.h

> +#ifdef SQUASHFS_TRACE
> +#define TRACE(s, args...)	printk(KERN_NOTICE "SQUASHFS: "s, ## args)
> +#else
> +#define TRACE(s, args...)	{}
> +#endif

Just use

    #define TRACE(s, args...)	pr_debug("SQUASHFS: "s, ## args)

so we always get printf()-format checking, irrespective of whether DEBUG is
defined or not.

If you really want to keep the KERN_NOTICE (and the SQUASHFS_TRACE), you can
use

    #ifdef SQUASHFS_TRACE
    #define TRACE(s, args...)	pr_notice("SQUASHFS: "s, ## args)
    #else
    #define TRACE(s, args...)	pr_debug("SQUASHFS: "s, ## args)
    #endif

> +#define ERROR(s, args...)	printk(KERN_ERR "SQUASHFS error: "s, ## args)
                                ^^^^^^^^^^^^^^^^
				pr_err(
> +
> +#define SERROR(s, args...)	\
> +		do { \
> +			if (!silent) \
> +				printk(KERN_ERR "SQUASHFS error: "s, ## args);\
                                ^^^^^^^^^^^^^^^^
				pr_err(
> +		} while (0)

(yes, I know SERROR() no longer exists in CVS)

> +
> +#define WARNING(s, args...)	printk(KERN_WARNING "SQUASHFS: "s, ## args)
                                ^^^^^^^^^^^^^^^^
				pr_warning(

> --- /dev/null
> +++ b/include/linux/squashfs_fs.h

> +/* Filesystem flags */
> +#define SQUASHFS_NOI			0
> +#define SQUASHFS_NOD			1
> +#define SQUASHFS_NOF			3
> +#define SQUASHFS_NO_FRAG		4
> +#define SQUASHFS_ALWAYS_FRAG		5
> +#define SQUASHFS_DUPLICATE		6
> +#define SQUASHFS_EXPORT			7
> +
> +#define SQUASHFS_BIT(flag, bit)		((flag >> bit) & 1)
> +
> +#define SQUASHFS_UNCOMPRESSED_INODES(flags)	SQUASHFS_BIT(flags, \
> +						SQUASHFS_NOI)
> +
> +#define SQUASHFS_UNCOMPRESSED_DATA(flags)	SQUASHFS_BIT(flags, \
> +						SQUASHFS_NOD)
> +
> +#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags)	SQUASHFS_BIT(flags, \
> +						SQUASHFS_NOF)
> +
> +#define SQUASHFS_NO_FRAGMENTS(flags)		SQUASHFS_BIT(flags, \
> +						SQUASHFS_NO_FRAG)
> +
> +#define SQUASHFS_ALWAYS_FRAGMENTS(flags)	SQUASHFS_BIT(flags, \
> +						SQUASHFS_ALWAYS_FRAG)
> +
> +#define SQUASHFS_DUPLICATES(flags)		SQUASHFS_BIT(flags, \
> +						SQUASHFS_DUPLICATE)
> +
> +#define SQUASHFS_EXPORTABLE(flags)		SQUASHFS_BIT(flags, \
> +						SQUASHFS_EXPORT)
> +
> +#define SQUASHFS_MKFLAGS(noi, nod, nof, no_frag, always_frag, \
> +		duplicate_checking, exportable)	(noi | (nod << 1) \
                                                               ^
> +		| (nof << 3) | (no_frag << 4) | (always_frag << 5) | \
                          ^                ^                    ^
> +		(duplicate_checking << 6) | (exportable << 7))
                                       ^                   ^
For the shifts, you can use the SQUASHFS_* filesystem flags defined above
instead of the hardcoded numbers.

SQUASHFS_MKFLAGS() isn't used by the kernel, only by the tools (mksquashfs)?

> +/* meta index cache */
> +#define SQUASHFS_META_INDEXES	(SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
                                                                         ^^^^^^^^^^^^
I was wondering whether a meta index is an `unsigned int' or an `__le32', but I
couldn't find it easily.

With kind regards,

Geert Uytterhoeven
Software Architect

Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium

Phone:    +32 (0)2 700 8453
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E-mail:   Geert.Uytterhoeven@...ycom.com
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