lkml.org 
[lkml]   [2001]   [May]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Why side-effects on open(2) are evil. (was Re: [RFD w/info-PATCH]device arguments from lookup)

On Tue, 22 May 2001, Andreas Dilger wrote:
>
> Actually, the LVM snapshot interface has (optional) hooks into the filesystem
> to ensure that it is consistent at the time the snapshot is created.

Note that this is still fundamentally a broken interface: the filesystem
may not _have_ a block device underneath it, yet you might very well like
to do defragmentation and backup none-the-less.

Also, lvm snapshots are fundamentally limited to read-only data, which
means that the LVM interfaces cannot be used for defragmentation and lazy
fsck etc anyway. You _have_ to do those at a filesystem level.

disk snapshots are useful, but they are not the answer.

Linus

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:53    [W:0.124 / U:6.332 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site