Messages in this thread | | | Date | Tue, 17 Jun 2008 16:06:28 +0200 | From | Maxim Shchetynin <> | Subject | Re: AZFS file system proposal |
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On Tue, 17 Jun 2008 12:53:00 +0200 Jörn Engel <joern@logfs.org> wrote:
> On Tue, 17 June 2008 11:35:10 +0200, Jan Engelhardt wrote: > > On Tuesday 2008-06-17 11:06, Maxim Shchetynin wrote: > > > > >I would say you can either mmap it or place a file system on it. > > > > The help text implies that I *need* azfs to mmap it - and that sounds > > like a Rube Goldberg machine. > > Some people actually prefer filesystems over raw devices for a variety > of reasons: > - each file brings its own address space, which offers memory protection > from other processes, > - files can have owners and permission bits, > - files hide the fragmentation of the underlying device from users, > - a file system provides a common and well-understood api for devices > with less common or well-understood apis, > - etc. > > Those reasons are as valid for azfs as for any other filesystem. I have > no doubt that azfs is useful. It probably wouldn't hurt to express the > merits of the filesystem and the problems it is supposed to solve a > little better. So far most criticism was based on the fact that noone > understood what the hell it was all about. > > My personal question when looking at this is: Why not use ext2? It
Same reason we don't use ext2 for file system in RAM - we don't need any expensive caching and readahead mechanisms for devices which are as fast as main memory (or almost as fast).
> appears to me that an ext2 mounted with '-o xip' would solve the same > problems.
-- Mit freundlichen Grüßen / met vriendelijke groeten / avec regards
Maxim V. Shchetynin Linux Kernel Entwicklung IBM Deutschland Entwicklung GmbH Linux für Cell, Abteilung 3250 Schönaicher Straße 220 71032 Böblingen
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