From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from flinx.npwt.net (eric@flinx.npwt.net [208.236.161.237]) by kvack.org (8.8.7/8.8.7) with ESMTP id BAA07921 for ; Fri, 12 Jun 1998 01:06:25 -0400 Subject: shmfs-0.1.009 & shmfs-0.3.001 are available From: ebiederm+eric@npwt.net (Eric W. Biederman) Date: 12 Jun 1998 00:00:25 -0500 Message-ID: Sender: owner-linux-mm@kvack.org To: SHMFS list Cc: linux-mm@kvack.org List-ID: When pondering how to add POSIX.4 shared memory areas to linux it occured to me that probably the easiest way would be just to implement a simple filesystem, and code into libc in which directory to look. It also occured to me this would be a good opportunity to work on adding dirty page support to the page cache code and I have done that as well. The quick synopsis of what I have written is as follows: A complete filesystem that resides in swap, and for kicks and reduced space consumption uses a btree for all of it's directories. A patch to allow the page cache to handle dirty files A patch to allow the swapoff to work with swap pages that do not reside in page tables. SYSV shared memory has been modified to work with this, fixing a really old/rare swapoff bug. A patch to allow asynchronous I/O to swapfiles. This is an beta release, aimed at producing a stable version shortly. My code is at: http://www.npwt.net/~ebiederm/files/ files: shmfs-0.1.009.tar.gz shmfs-0.3.001.tar.gz shmfs-0.3.001 is a developmental version written primarily by Gabor Kuti where new features are being worked upon. Since I just started integrating his patches I may have done something stupid... shmfs-0.1.009 has hit the code freeze before becoming shmfs-0.2.000 a stable and usefull version. Strange interactions with kernel memory management are the only things left before 0.2 This works with both kernels 2.0.32 and 2.1.101. 2.1.102-2.1.105 should also work but I haven't tested those. 2.0.32 support is almost necessary so I can tell my bugs from, those of others :) Changes since 0.1.008: Fixed minor bugs and ported to kernel 101. Now I should have a correct kernel patch, on a kernel that handles swapping correctly. Use on development kernels is no longer discouraged, only minor performance glitches appear to remain as problems there. Changes since 0.1.004: I have synchronized my two versions, and rewritten a bunch of namei code in the search for races. And I have found and fixed my mysterious mutating symlink bug. Eric