On Tue, 2005-01-25 at 01:26 +0200, Hirsch, Michael wrote: > Hi, > > I'm probably asking something so obvious ... but I admit that I'm > somewhat of a beginner.
Actually, the answer isn't so obvious. > I saw dense files mentioned in some of the publications on the open > source JFS, but have not found a way of doing this from within the > docs, the code, the mkfs or the tune utility. I've tried to trace the > *SPARSE flags in the fs/jfs and jfsutils. I've tried searching the > jfs-*.mbox files on the official jfs website for "sparse" and "dense" > and "contiguous" but nothing turned up. Looked through the file > layout paper which has a great example of a sparse file, but I'm > looking for a dense example. jfs on Linux does not support the dense file option. The docs mention dense files because the code was originally ported from OS/2, where dense-file creation was the default behavior. At the time of the port, it seemed a reasonable thing to eventually support both dense and sparse options in Linux, as this would be more compatible with OS/2. As time went on, the dense file support was never much of a priority, and it probably won't be. Applications that would benefit from dense files can write a file sequentially when creating it, and get the same behavior. > I'm running RH ES3 AS update 2, kernel 2.4.21-20.Elsmp on an x86_64 > platform if any of this is relevant. > > Pointers would be appreciated. > > Thanks in advance, > Michael. -- David Kleikamp IBM Linux Technology Center _______________________________________________ Jfs-discussion mailing list [email protected] http://www-124.ibm.com/developerworks/oss/mailman/listinfo/jfs-discussion
