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afs: support the CB.ProbeUuid RPC op 

Add support for the CB.ProbeUuid cache manager RPC op.  This allows a modern
OpenAFS server to quickly ask if the client has been rebooted.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells 2008-04-29 01:03:22 -07:00 committed by Linus Torvalds
parent 7c80bcce34
commit 9396d496d7
2 changed files with 108 additions and 0 deletions
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1
fs/afs/afs_cm.h
View File

@ -24,6 +24,7 @@ enum AFS_CM_Operations {
CBGetXStatsVersion = 209, /* get version of extended statistics */
CBGetXStats = 210, /* get contents of extended statistics data */
CBInitCallBackState3 = 213, /* initialise callback state, version 3 */
CBProbeUuid = 214, /* check the client hasn't rebooted */
CBTellMeAboutYourself = 65538, /* get client capabilities */
};

107
fs/afs/cmservice.c
View File

@ -26,6 +26,7 @@ static int afs_deliver_cb_init_call_back_state3(struct afs_call *,
struct sk_buff *, bool);
static int afs_deliver_cb_probe(struct afs_call *, struct sk_buff *, bool);
static int afs_deliver_cb_callback(struct afs_call *, struct sk_buff *, bool);
static int afs_deliver_cb_probe_uuid(struct afs_call *, struct sk_buff *, bool);
static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *,
struct sk_buff *, bool);
static void afs_cm_destructor(struct afs_call *);
@ -70,6 +71,16 @@ static const struct afs_call_type afs_SRXCBProbe = {
.destructor = afs_cm_destructor,
};
/*
* CB.ProbeUuid operation type
*/
static const struct afs_call_type afs_SRXCBProbeUuid = {
.name = "CB.ProbeUuid",
.deliver = afs_deliver_cb_probe_uuid,
.abort_to_error = afs_abort_to_error,
.destructor = afs_cm_destructor,
};
/*
* CB.TellMeAboutYourself operation type
*/
@ -392,6 +403,102 @@ static int afs_deliver_cb_probe(struct afs_call *call, struct sk_buff *skb,
return 0;
}
/*
* allow the fileserver to quickly find out if the fileserver has been rebooted
*/
static void SRXAFSCB_ProbeUuid(struct work_struct *work)
{
struct afs_call *call = container_of(work, struct afs_call, work);
struct afs_uuid *r = call->request;
struct {
__be32 match;
} reply;
_enter("");
if (memcmp(r, &afs_uuid, sizeof(afs_uuid)) == 0)
reply.match = htonl(0);
else
reply.match = htonl(1);
afs_send_simple_reply(call, &reply, sizeof(reply));
_leave("");
}
/*
* deliver request data to a CB.ProbeUuid call
*/
static int afs_deliver_cb_probe_uuid(struct afs_call *call, struct sk_buff *skb,
bool last)
{
struct afs_uuid *r;
unsigned loop;
__be32 *b;
int ret;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
if (skb->len > 0)
return -EBADMSG;
if (!last)
return 0;
switch (call->unmarshall) {
case 0:
call->offset = 0;
call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL);
if (!call->buffer)
return -ENOMEM;
call->unmarshall++;
case 1:
_debug("extract UUID");
ret = afs_extract_data(call, skb, last, call->buffer,
11 * sizeof(__be32));
switch (ret) {
case 0: break;
case -EAGAIN: return 0;
default: return ret;
}
_debug("unmarshall UUID");
call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
if (!call->request)
return -ENOMEM;
b = call->buffer;
r = call->request;
r->time_low = ntohl(b[0]);
r->time_mid = ntohl(b[1]);
r->time_hi_and_version = ntohl(b[2]);
r->clock_seq_hi_and_reserved = ntohl(b[3]);
r->clock_seq_low = ntohl(b[4]);
for (loop = 0; loop < 6; loop++)
r->node[loop] = ntohl(b[loop + 5]);
call->offset = 0;
call->unmarshall++;
case 2:
_debug("trailer");
if (skb->len != 0)
return -EBADMSG;
break;
}
if (!last)
return 0;
call->state = AFS_CALL_REPLYING;
INIT_WORK(&call->work, SRXAFSCB_ProbeUuid);
schedule_work(&call->work);
return 0;
}
/*
* allow the fileserver to ask about the cache manager's capabilities
*/