afs: Fix the maximum lifespan of VL and probe calls

If an older AFS server doesn't support an operation, it may accept the call
and then sit on it forever, happily responding to pings that make kafs
think that the call is still alive.

Fix this by setting the maximum lifespan of Volume Location service calls
in particular and probe calls in general so that they don't run on
endlessly if they're not supported.

Signed-off-by: David Howells <dhowells@redhat.com>

5 files changed, 13 insertions, 0 deletions

diff --git a/fs/afs/afs.h b/fs/afs/afs.h
index d12ffb457e47..74913c707bba 100644
--- a/fs/afs/afs.h
+++ b/fs/afs/afs.h
@@ -23,6 +23,9 @@
 #define AFSPATHMAX		1024	/* Maximum length of a pathname plus NUL */
 #define AFSOPAQUEMAX		1024	/* Maximum length of an opaque field */
 
+#define AFS_VL_MAX_LIFESPAN	(120 * HZ)
+#define AFS_PROBE_MAX_LIFESPAN	(30 * HZ)
+
 typedef u64			afs_volid_t;
 typedef u64			afs_vnodeid_t;
 typedef u64			afs_dataversion_t;
diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c
index 1296f5dc4c1e..7051b58d8a55 100644
--- a/fs/afs/fsclient.c
+++ b/fs/afs/fsclient.c
@@ -2115,6 +2115,7 @@ struct afs_call *afs_fs_get_capabilities(struct afs_net *net,
 	call->upgrade = true;
 	call->want_reply_time = true;
 	call->async = true;
+	call->max_lifespan = AFS_PROBE_MAX_LIFESPAN;
 
 	/* marshall the parameters */
 	bp = call->request;
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 50d925f0a556..4765c6716242 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -131,6 +131,7 @@ struct afs_call {
 	int			error;		/* error code */
 	u32			abort_code;	/* Remote abort ID or 0 */
 	u32			epoch;
+	unsigned int		max_lifespan;	/* Maximum lifespan to set if not 0 */
 	unsigned		request_size;	/* size of request data */
 	unsigned		reply_max;	/* maximum size of reply */
 	unsigned		first_offset;	/* offset into mapping[first] */
diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index a34a89c75c6a..4974defb4592 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -426,6 +426,10 @@ void afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call, gfp_t gfp)
 
 	call->rxcall = rxcall;
 
+	if (call->max_lifespan)
+		rxrpc_kernel_set_max_life(call->net->socket, rxcall,
+					  call->max_lifespan);
+
 	/* send the request */
 	iov[0].iov_base	= call->request;
 	iov[0].iov_len	= call->request_size;
diff --git a/fs/afs/vlclient.c b/fs/afs/vlclient.c
index dd9ba4e96fb3..7c53768a360b 100644
--- a/fs/afs/vlclient.c
+++ b/fs/afs/vlclient.c
@@ -157,6 +157,7 @@ struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *vc,
 	call->key = vc->key;
 	call->reply[0] = entry;
 	call->ret_reply0 = true;
+	call->max_lifespan = AFS_VL_MAX_LIFESPAN;
 
 	/* Marshall the parameters */
 	bp = call->request;
@@ -289,6 +290,7 @@ struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *vc,
 	call->key = vc->key;
 	call->reply[0] = NULL;
 	call->ret_reply0 = true;
+	call->max_lifespan = AFS_VL_MAX_LIFESPAN;
 
 	/* Marshall the parameters */
 	bp = call->request;
@@ -403,6 +405,7 @@ struct afs_call *afs_vl_get_capabilities(struct afs_net *net,
 	call->upgrade = true;
 	call->want_reply_time = true;
 	call->async = true;
+	call->max_lifespan = AFS_PROBE_MAX_LIFESPAN;
 
 	/* marshall the parameters */
 	bp = call->request;
@@ -646,6 +649,7 @@ struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *vc,
 	call->key = vc->key;
 	call->reply[0] = NULL;
 	call->ret_reply0 = true;
+	call->max_lifespan = AFS_VL_MAX_LIFESPAN;
 
 	/* Marshall the parameters */
 	bp = call->request;