Date: 21 Nov 1999 05:27:57 +0100 From: Assar Westerlund <assar@sics.se> To: Wes Peters <wes@softweyr.com>, "Daniel C. Sobral" <dcs@newsguy.com> Cc: hackers@FreeBSD.ORG Subject: Re: Portable way to compare struct stat's? Message-ID: <5ln1s88o4y.fsf@foo.sics.se> In-Reply-To: Wes Peters's message of "Sat, 20 Nov 1999 20:21:40 -0700" References: <XFMail.991118185611.jdp@polstra.com> <3836DF98.9A84EC44@newsguy.com> <3836F873.D3B989FE@softweyr.com> <3836FF7C.2D8236AE@newsguy.com> <38376544.96B017E9@softweyr.com>
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Wes Peters <wes@softweyr.com> writes:
> "Daniel C. Sobral" wrote:
> >
> > Just to expand a little bit more, some distributed filesystems *do
> > not* have a unique identifier like the inode.
>
> So then the FreeBSD client software should create one? Do they just assign
> a random number as the st_ino when stat'ing the file?
If there's none, you of course have to create one. As long as you
keep giving the same `va_fileid' to the same file (by remembering what
files you have seen), I guess that's ok. But then I don't know of any
distributed filesystem that acts this way (what's `same' in the text
above?). What filesystems are like that?
Looking at some existing file systems:
NFS - the server returns a 32-bit file-ID
AFS/Arla - files are identified by (cell, volume, vnode,
uniquifier) which is hashed down to a 32 bit fileno
Coda - same as AFS/Arla
/assar
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