Re: what is our answer to ZFS?

From: Bill Davidsen
Date: Wed Nov 23 2005 - 10:52:19 EST

Theodore Ts'o wrote:
On Tue, Nov 22, 2005 at 07:25:20PM +0000, Anton Altaparmakov wrote:

The standards are insufficient however. For example dealing with named streams or extended attributes if exposed as "normal files" would naturally have the same st_ino (given they are the same inode as the normal file data) and st_dev fields.

Um, but that's why even Solaris's openat(2) proposal doesn't expose
streams or extended attributes as "normal files". The answer is that
you can't just expose named streams or extended attributes as "normal
files" without screwing yourself.

Reiser4 does I believe...

Reiser4 violates POSIX. News at 11....

I was not talking about Solaris/UFS. NTFS has named streams and extended attributes and both are stored as separate attribute records inside the same inode as the data attribute. (A bit simplified as multiple inodes can be in use for one "file" when an inode's attributes become large than an inode - in that case attributes are either moved whole to a new inode and/or are chopped up in bits and each bit goes to a different inode.)

NTFS violates POSIX. News at 11....

True, but perhaps in this case it's time for POSIX to move, the things in filesystems, and which are used as filesystems have changed a bunch.

It would be nice to have a neutral standard rather than adopting existing extended implementations, just because the politics of it are that everyone but MS would hate NTFS, MS would hate any of the existing others, and a new standard would have the same impact on everyone and therefore might be viable. Not a quick fix, however, standards take a LONG time.
-bill davidsen (davidsen@xxxxxxx)
"The secret to procrastination is to put things off until the
last possible moment - but no longer" -me

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