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nfsd: change heuristic for selecting the client_tracking_ops

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First, try to use the new usermodehelper upcall. It should succeed or
fail quickly, so there's little cost to doing so.

If it fails, and the legacy tracking dir exists, use that. If it
doesn't exist then fall back to using nfsdcld.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2012-11-12 15:00:49 -05:00 committed by J. Bruce Fields
parent 2873d2147e
commit 2d77bf0a55
1 changed files with 27 additions and 9 deletions
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36
fs/nfsd/nfs4recover.c
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@ -1064,17 +1064,35 @@ nfsd4_client_tracking_init(struct net *net)
int status;
struct path path;
if (!client_tracking_ops) {
client_tracking_ops = &nfsd4_cld_tracking_ops;
status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
if (!status) {
if (S_ISDIR(path.dentry->d_inode->i_mode))
client_tracking_ops =
&nfsd4_legacy_tracking_ops;
path_put(&path);
}
/* just run the init if it the method is already decided */
if (client_tracking_ops)
goto do_init;
/*
* First, try a UMH upcall. It should succeed or fail quickly, so
* there's little harm in trying that first.
*/
client_tracking_ops = &nfsd4_umh_tracking_ops;
status = client_tracking_ops->init(net);
if (!status)
return status;
/*
* See if the recoverydir exists and is a directory. If it is,
* then use the legacy ops.
*/
client_tracking_ops = &nfsd4_legacy_tracking_ops;
status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
if (!status) {
status = S_ISDIR(path.dentry->d_inode->i_mode);
path_put(&path);
if (status)
goto do_init;
}
/* Finally, try to use nfsdcld */
client_tracking_ops = &nfsd4_cld_tracking_ops;
do_init:
status = client_tracking_ops->init(net);
if (status) {
printk(KERN_WARNING "NFSD: Unable to initialize client "