Messages in this thread | | | Date | Sun, 30 May 1999 12:02:51 -0700 (PDT) | From | Jeremy Fitzhardinge <> | Subject | Re: XFS and journalling filesystems |
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On 28-May-99 Adam Lock wrote: > I was just browsing the BeOS site and that too claims to have a 64-bit > journalling filesystem. Perhaps that would be better suited for home systems > if > only there were more details available for it...
More has been published about bfs than almost any other commercial filesystem. There's a book ("Practial File System Design with the Be file system") which goes into great detail about it. There's also one read-only implementation of a driver for Linux.
The Be filesystem is pretty good. It's basically a traditional structure, except directories are btrees and there's a metadata journal. There's a number of interesting BeOS-specific features too, such as indexed file attributes.
It does have some limitations. Block mapping is done with the normal single/double (no triple) indirect blocks, which contain extents. The maximum file size is about 34G on an unfragmented filesystem. The block mapping imposes a maximum number of extents, which means the max file size goes down as the disk fragments.
It has definitely been designed as a single-user desktop filesystem. There's a number of tradeoffs which have been made against servers and towards single-user use, which makes sense given the nature of the OS.
J
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