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

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Date:	Tue, 13 Jan 2009 13:55:26 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Benny Halevy <bhalevy@...asas.com>
Cc:	Boaz Harrosh <bharrosh@...asas.com>,
	open-osd development <osd-dev@...n-osd.org>,
	Avishay Traeger <avishay@...il.com>,
	Jeff Garzik <jeff@...zik.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [osd-dev] [PATCH 1/9] exofs: osd Swiss army knife

> > +#define EXOFS_SUPER_ID	0x10000	/* object ID for on-disk superblock */

And if an OS failure breaks the super block and you have only one how do
you recover it ?

> > +#define EXOFS_BM_ID	0x10001	/* object ID for ID bitmap */
> > +#define EXOFS_ROOT_ID	0x10002	/* object ID for root directory */
> > +#define EXOFS_TEST_ID	0x10003	/* object ID for test object */

Ditto some of the others

> > +	EXOFS_UINT64_MAX = (~0LL),
> > +	EXOFS_MAX_INO_ID = (sizeof(ino_t) * 8 == 64) ? EXOFS_UINT64_MAX :
> > +					(1LL << (sizeof(ino_t) * 8 - 1)),

Ok so thats quite a big number

> > +	uint32_t  s_nextid;	/* Highest object ID used */

but that is a smaller one

> > +	uint32_t  s_numfiles;	/* Number of files on fs */

as is this

> > +	uint32_t  i_atime;        	/* Access time */
> > +	uint32_t  i_ctime;        	/* Creation time */
> > +	uint32_t  i_mtime;        	/* Modification time */

2038 ? - bits are cheap

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