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authorDavid Howells <dhowells@redhat.com>2017-11-02 18:27:53 +0300
committerDavid Howells <dhowells@redhat.com>2017-11-13 18:38:21 +0300
commit98bf40cd99fcfed0705812b6cbdbb3b441a42970 (patch)
treee0108e6306a6fde29bf7d5348f730922a18dc2b1 /fs/afs/internal.h
parent13524ab3c6f41bcd257d28644414297bea8282b7 (diff)
downloadlinux-98bf40cd99fcfed0705812b6cbdbb3b441a42970.tar.xz
afs: Protect call->state changes against signals
Protect call->state changes against the call being prematurely terminated due to a signal. What can happen is that a signal causes afs_wait_for_call_to_complete() to abort an afs_call because it's not yet complete whilst afs_deliver_to_call() is delivering data to that call. If the data delivery causes the state to change, this may overwrite the state of the afs_call, making it not-yet-complete again - but no further notifications will be forthcoming from AF_RXRPC as the rxrpc call has been aborted and completed, so kAFS will just hang in various places waiting for that call or on page bits that need clearing by that call. A tracepoint to monitor call state changes is also provided. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/afs/internal.h')
-rw-r--r--fs/afs/internal.h63
1 files changed, 54 insertions, 9 deletions
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 1de36e6abd5e..bd8dcee7e066 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -51,13 +51,14 @@ struct afs_iget_data {
};
enum afs_call_state {
- AFS_CALL_REQUESTING, /* request is being sent for outgoing call */
- AFS_CALL_AWAIT_REPLY, /* awaiting reply to outgoing call */
- AFS_CALL_AWAIT_OP_ID, /* awaiting op ID on incoming call */
- AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */
- AFS_CALL_REPLYING, /* replying to incoming call */
- AFS_CALL_AWAIT_ACK, /* awaiting final ACK of incoming call */
- AFS_CALL_COMPLETE, /* Completed or failed */
+ AFS_CALL_CL_REQUESTING, /* Client: Request is being sent */
+ AFS_CALL_CL_AWAIT_REPLY, /* Client: Awaiting reply */
+ AFS_CALL_CL_PROC_REPLY, /* Client: rxrpc call complete; processing reply */
+ AFS_CALL_SV_AWAIT_OP_ID, /* Server: Awaiting op ID */
+ AFS_CALL_SV_AWAIT_REQUEST, /* Server: Awaiting request data */
+ AFS_CALL_SV_REPLYING, /* Server: Replying */
+ AFS_CALL_SV_AWAIT_ACK, /* Server: Awaiting final ACK */
+ AFS_CALL_COMPLETE, /* Completed or failed */
};
/*
@@ -97,6 +98,7 @@ struct afs_call {
size_t offset; /* offset into received data store */
atomic_t usage;
enum afs_call_state state;
+ spinlock_t state_lock;
int error; /* error code */
u32 abort_code; /* Remote abort ID or 0 */
unsigned request_size; /* size of request data */
@@ -543,6 +545,8 @@ struct afs_fs_cursor {
#define AFS_FS_CURSOR_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */
};
+#include <trace/events/afs.h>
+
/*****************************************************************************/
/*
* addr_list.c
@@ -788,6 +792,49 @@ static inline int afs_transfer_reply(struct afs_call *call)
return afs_extract_data(call, call->buffer, call->reply_max, false);
}
+static inline bool afs_check_call_state(struct afs_call *call,
+ enum afs_call_state state)
+{
+ return READ_ONCE(call->state) == state;
+}
+
+static inline bool afs_set_call_state(struct afs_call *call,
+ enum afs_call_state from,
+ enum afs_call_state to)
+{
+ bool ok = false;
+
+ spin_lock_bh(&call->state_lock);
+ if (call->state == from) {
+ call->state = to;
+ trace_afs_call_state(call, from, to, 0, 0);
+ ok = true;
+ }
+ spin_unlock_bh(&call->state_lock);
+ return ok;
+}
+
+static inline void afs_set_call_complete(struct afs_call *call,
+ int error, u32 remote_abort)
+{
+ enum afs_call_state state;
+ bool ok = false;
+
+ spin_lock_bh(&call->state_lock);
+ state = call->state;
+ if (state != AFS_CALL_COMPLETE) {
+ call->abort_code = remote_abort;
+ call->error = error;
+ call->state = AFS_CALL_COMPLETE;
+ trace_afs_call_state(call, state, AFS_CALL_COMPLETE,
+ error, remote_abort);
+ ok = true;
+ }
+ spin_unlock_bh(&call->state_lock);
+ if (ok)
+ trace_afs_call_done(call);
+}
+
/*
* security.c
*/
@@ -932,8 +979,6 @@ static inline void afs_check_for_remote_deletion(struct afs_fs_cursor *fc,
/*
* debug tracing
*/
-#include <trace/events/afs.h>
-
extern unsigned afs_debug;
#define dbgprintk(FMT,...) \