Sorry!
I do see the potential problem you are in - if Websphere is using flock().
The source code explicitly state no BSD flocks
" * No BSD flocks over NFS allowed.' (See code excerpt below)
The code on SLES10 has an flock() function and it looks to me like it
will convert flock() to a POSIX lock.
Not sure if thats what you want, but I think using SLES10 is your only
option. (With NFS V3 or V4)
mark
From fs/nfs/file.c:
/*
* Lock a (portion of) a file
*/
int
nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
{
struct inode * inode = filp->f_mapping->host;
int status = 0;
int status2;
dprintk("NFS: nfs_lock(f=%s/%ld, t=%x, fl=%x, r=%Ld:%Ld)\n",
inode->i_sb->s_id, inode->i_ino,
fl->fl_type, fl->fl_flags,
(long long)fl->fl_start, (long long)fl->fl_end);
if (!inode)
return -EINVAL;
/* No mandatory locks over NFS */
if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
return -ENOLCK;
if (NFS_PROTO(inode)->version != 4) {
/* Fake OK code if mounted without NLM support */
if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) {
if (IS_GETLK(cmd))
status = LOCK_USE_CLNT;
goto out_ok;
}
}
/*
* No BSD flocks over NFS allowed.
* Note: we could try to fake a POSIX lock request here by
* using ((u32) filp | 0x80000000) or some such as the pid.
* Not sure whether that would be unique, though, or whether
* that would break in other places.
*/
if (!fl->fl_owner || !(fl->fl_flags & FL_POSIX))
return -ENOLCK;
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