Messages in this thread |  | | Date | Fri, 26 Oct 2001 21:06:40 +1000 | From | Gunnar Raetsch <> | Subject | hardlinks - knfsd - reiserfs bug |
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Hi all,
I've got problems with hard links when using the kernel-nfsd and reiserfs. The nfs server gives e.g. the following error messages
Oct 25 08:59:09 hebb kernel: nfsd Security: sbin/init bad export. Oct 25 08:59:10 hebb kernel: nfsd Security: bin/bash bad export.
and the client is not able to read the file.
This only happens, if the exported files on the server are hard linked with other files -- so I reckon it has something to do with the hard links (other potentially interesting details attached below: raid, lvm ..) Furthermore, I did the same on another system using ext2-fs and it worked perfectly (but without raid&lvm).
So, it might be the combination of hard links & knfsd & reiserfs, which has a bug somewhere.
Do you know what to do?? Any help is appreciated!
Gunnar
PS: please CC me your answer.
Details:
I'm running an single CPU (Athlon) server with six disks -- five of them in a software raid (level 5). On top of the raid runs LVM to split-up the big partitions (30+30+250Gb). On each of the partitions is reiserfs 3.6.25 file system (converted from 3.5.x). The server runs a 2.4.10 kernel (originally a 2.4.5 kernel + reiserfs-quota-knfsd patches; then patched up to 2.4.10).
The nfs-client runs the same kernel (with nfsroot option switched on). The Root-fs of the client is on the server (on a raid/lvm/reiserfs partition). When booting the client, if the server uses hard links of the exported files, it does not find e.g. sbin/init and booting the client fails. If there are no hard links everything works.
I also tried the new 2.4.13 kernel (the original and also the 2.4.10 from before + three patches) on client and server. It worked a little bit better: now the client comes up, but very soon I get the same error messages for other essential files (ie. its not usable).
The directory structure of the server:
I have e.g. these directories (one for each client gauss, laplace, poisson)
$$/gauss/ $$/laplace/ $$/poisson/
in each of them is a copy of a linux system (SuSE 7.1, without /usr and /opt -- they are exported separately). The server exports (ro,no_root_squash) each directory above to the particular client only.
To save disk space I'd like to hard link the files in these directories to each other. I created a new directory $$/generic, copied the files to be hard linked and created hard-links from the files in all other directories to the generic directory. After this operation the clients do not boot anymore.
$$=/export/clients/7.1/
-- Gunnar R"atsch http://mlg.anu.edu.au/~raetsch Australian National University mailto:Gunnar.Raetsch@anu.edu.au - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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