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statfs() gives ESTALE error 

Hi,

An NFS client executes a statfs("file", &buff) call.
"file" exists / existed, the client has read / written it,
but it has already closed it.

user_path(pathname, &path) looks up "file" successfully in the
directory-cache  and restarts the aging timer of the directory-entry.
Even if "file" has already been removed from the server, because the
lookupcache=positive option I use, keeps the entries valid for a while.

nfs_statfs() returns ESTALE if "file" has already been removed from the
server.

If the user application repeats the statfs("file", &buff) call, we
are stuck: "file" remains young forever in the directory-cache.

Signed-off-by: Zoltan Menyhart  <Zoltan.Menyhart@bull.net>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@kernel.org
This commit is contained in:
Menyhart Zoltan 2010-09-12 19:55:26 -04:00 committed by Trond Myklebust
parent b20d37ca95
commit fbf3fdd244
1 changed files with 8 additions and 0 deletions
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8
fs/nfs/super.c
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@ -431,7 +431,15 @@ static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
goto out_err;
error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
if (unlikely(error == -ESTALE)) {
struct dentry *pd_dentry;
pd_dentry = dget_parent(dentry);
if (pd_dentry != NULL) {
nfs_zap_caches(pd_dentry->d_inode);
dput(pd_dentry);
}
}
nfs_free_fattr(res.fattr);
if (error < 0)
goto out_err;