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[PATCH][ALPHA 3] ext2fs and large stores (> 1.5G)

From: Ognyan Kulev
Subject: [PATCH][ALPHA 3] ext2fs and large stores (> 1.5G)
Date: Mon, 21 Jul 2003 14:51:37 +0300
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030714 Debian/1.4-2

The third alpha-quality patch that makes ext2fs able to use large stores is available for testing. The major change since the previous alpha is using Neal's suggestion[1] of leaving to Mach the decisions which pages are paged out and when.

[1] http://mail.gnu.org/archive/html/bug-hurd/2003-05/msg00024.html


Download the patch from http://debian.fmi.uni-sofia.bg/~ogi/hurd/ext3fs/ , apply to Hurd source tree and compile with something like "make ext2fs". It's important to use ext2fs.static instead of ext2fs because libpager ABI is changed so new ext2fs won't work with old libpager.


I put a great effort (and time) to assure that there will be no problems with Alpha 3. Unfortunately, I still can't claim that. Data corruption seems to be gone, but there are some strange hangs after an hour of compiling glibc (on P4 1.6G) that I cannot look closely. For example, the compilation is working in screen program window, but keyboard doesn't respond, even Alt-F2 doesn't work (console server is running). I connect to telnetd, do "ps ax", and after some printed lines, the machine reboots... If you don't push the ext2fs server too much, there is a chance you won't have problems.


Leaving decisions which pages are evicted to Mach requires changes in libpager. I've done some changes that work for me, but I don't claim they are the best. Anyone interested, especially core developers, is invited to discuss polishing this interface. This includes the changes in libpager/data-{request,return}.c. In particular, I'm not certain if handling PAGEINWAIT case is entirely correct.


e2fsprogs uses Unix API to work with partitions/images. Unfortunately, we have a limit of 2G for files, so I've made an ugly patch for e2fsprogs that uses libstore in e2fsck as "Hurd IO manager". Probably when the patch is polished, I'll send it upstream.

Ognyan Kulev <ogi@{fmi.uni-sofia.bg,fsa-bg.org}>
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