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nfsd4: simpler ordering of setclientid_confirm checks

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The cases here divide into two main categories:

	- if there's an uncomfirmed record with a matching verifier,
	  then this is a "normal", succesful case: we're either creating
	  a new client, or updating an existing one.
	- otherwise, this is a weird case: a replay, or a server reboot.

Reordering to reflect that makes the code a bit more concise and the
logic a lot easier to understand.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2012-05-19 13:55:22 -04:00
parent f3d03b9202
commit 90d700b779
1 changed files with 11 additions and 13 deletions
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24
fs/nfsd/nfs4state.c
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@ -2245,18 +2245,21 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
goto out;
/* cases below refer to rfc 3530 section 14.2.34: */
if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
/* case 1: callback update */
if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
if (conf && !unconf) /* case 2: probable retransmit */
status = nfs_ok;
else /* case 4: client hasn't noticed we rebooted yet? */
status = nfserr_stale_clientid;
goto out;
}
status = nfs_ok;
if (conf) { /* case 1: callback update */
nfsd4_change_callback(conf, &unconf->cl_cb_conn);
nfsd4_probe_callback(conf);
expire_client(unconf);
status = nfs_ok;
} else if (conf && !unconf) {
status = nfs_ok;
} else if (!conf && unconf
&& same_verf(&unconf->cl_confirm, &confirm)) {
/* case 3: normal case; new or rebooted client */
} else { /* case 3: normal case; new or rebooted client */
unsigned int hash = clientstr_hashval(unconf->cl_recdir);
conf = find_confirmed_client_by_str(unconf->cl_recdir, hash);
if (conf) {
nfsd4_client_record_remove(conf);
@ -2264,11 +2267,6 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
}
move_to_confirmed(unconf);
nfsd4_probe_callback(unconf);
status = nfs_ok;
} else if ((!conf || !same_verf(&conf->cl_confirm, &confirm))
&& (!unconf || !same_verf(&unconf->cl_confirm, &confirm))) {
/* case 4: client hasn't noticed we rebooted yet? */
status = nfserr_stale_clientid;
}
out:
nfs4_unlock_state();