linux-kernel - Re: [PATCH 1/9] exofs: osd Swiss army knife

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Date:	Sun, 4 Jan 2009 21:03:18 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Boaz Harrosh <bharrosh@...asas.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, avishay@...il.com,
	jeff@...zik.org, viro@...IV.linux.org.uk,
	linux-fsdevel@...r.kernel.org, osd-dev@...n-osd.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/9] exofs: osd Swiss army knife

On Sun 2009-01-04 10:43:09, Boaz Harrosh wrote:
> Pavel Machek wrote:
> > Hi!
> > 
> >>> In this patch are all the osd infrastructure that will be used later
> >>> by the file system.
> >>>
> >>> Also the declarations of constants, on disk structures, and prototypes.
> >>>
> >>> And the Kbuild+Kconfig files needed to build the exofs module.
> >>>
> >>>
> >>> ...
> >>>
> >>> +struct exofs_sb_info {
> >>> +	struct osd_dev	*s_dev;			/* returned by get_osd_dev    */
> >>> +	uint64_t	s_pid;			/* partition ID of file system*/
> >>> +	int		s_timeout;		/* timeout for OSD operations */
> >>> +	uint32_t	s_nextid;		/* highest object ID used     */
> >>> +	uint32_t	s_numfiles;		/* number of files on fs      */
> >>> +	spinlock_t	s_next_gen_lock;	/* spinlock for gen # update  */
> >>> +	u32		s_next_generation;	/* next gen # to use          */
> >>> +	atomic_t	s_curr_pending;		/* number of pending commands */
> >>> +	uint8_t		s_cred[OSD_CAP_LEN];	/* all-powerful credential    */
> >>> +};
> >>> +
> >>> +/*
> >>> + * our inode flags
> >>> + */
> >>> +#ifdef ARCH_HAS_ATOMIC_UNSIGNED
> >> This doesn't exist, and it would be fairly bad to introduce it.  Please
> >> kill the ifdefs.
> >>
> >>> +typedef unsigned exofs_iflags_t;
> >>> +#else
> >>> +typedef unsigned long exofs_iflags_t;
> >>> +#endif
> >> Then please kill the typedef altogether and replace it with `unsigned
> >> long' everywhere
> > 
> > Hmmm.. .and at a note somewhere that we assume unsigned long to be atomic...?
> > 
> 
> I think I'll just use unsigned. It's more then enough I'm not using more then 3
> bits for now. Is unsigned workable for all ARCHs?

Please just use atomic_t.

(see "atomics: document that linux expects certain atomic behaviour"
thread for discussion)
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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