Problems writing large files using 2.6 client

I am having problems writing very large files via NFSv3 using a client with the 2.6 kernel. The NFS export is a subdirectory on an ext3 partition. The writes fail after transferring approximately 4.2 - 4.3 GB. I can append the files in 1GB increments without any problems. I can copy multiple 4.1GB files to the server without incident.

The following command errors out every time, the number of records written varies slightly.

dd if=/dev/zero of=/mnt/backup/test bs=1024 count=6M
dd: writing `/mnt/backup/test': Invalid argument 4376337+0 records in
4376336+0 records out

An strace of the previous command reports the following:

.
.
.
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,

    1024) = 1024

write(1,

    "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1024) =
    1024

read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,

    1024) = 1024

write(1,
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1024) = -1 EINVAL (Invalid argument)

write(2, "dd: ", 4) = 4
write(2, "writing `/mnt/backup/test\'", 26) = 26

  write(2, ": Invalid argument", 18)      = 18
  write(2, "\n", 1)                       = 1
  write(2, "4213600+0 records in\n", 21)  = 21
  write(2, "4213599+0 records out\n", 22) = 22
  close(0)                                = 0
  close(1)                                = 0
  _exit(1)                                = ?

There is nothing in the logs on either the client or the server that indicates that an error occurred or why the write failed. Both machines are using the 2.6 kernel and NFSv3 connected via 100 Mbit link.

The /etc/exports file on the server looks like:

/mnt/backup/testing yoshi(rw,no_root_squash,sync,no_subtree_check)

The /etc/fstab entry on the client looks like:

qserver:/mnt/backup/testing /mnt/backup nfs

        nfsvers=3,soft,rsize=8192,wsize=8192,noauto,noatime  0 0

The client kernel has the following kernel options set.

CONFIG_NFS_FS=y
CONFIG_NFS_V3=y
CONFIG_NFSD=y
CONFIG_NFSD_V3=y

I am able to write and 20GB file to the same server if I boot the client with a 2.4 kernel. The 2.4 kernel was prebuilt, however the 2.6 kernel was hand tuned.

I'm new to NFS so it is quite possible that I have messed something up when I configured the 2.6 kernel. Am I missing something obvious, or have a found a bug? I'd appreciate any help.

Quattro

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