* Use is subject to license terms.
*/
/*
- * Copyright (c) 2012 Whamcloud, Inc.
+ * Copyright (c) 2011, 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
struct ptlrpc_request;
struct obd_device;
+/**
+ * Serializes in-flight MDT-modifying RPC requests to preserve idempotency.
+ *
+ * This mutex is used to implement execute-once semantics on the MDT.
+ * The MDT stores the last transaction ID and result for every client in
+ * its last_rcvd file. If the client doesn't get a reply, it can safely
+ * resend the request and the MDT will reconstruct the reply being aware
+ * that the request has already been executed. Without this lock,
+ * execution status of concurrent in-flight requests would be
+ * overwritten.
+ *
+ * This design limits the extent to which we can keep a full pipeline of
+ * in-flight requests from a single client. This limitation could be
+ * overcome by allowing multiple slots per client in the last_rcvd file.
+ */
struct mdc_rpc_lock {
+ /** Lock protecting in-flight RPC concurrency. */
struct mutex rpcl_mutex;
+ /** Intent associated with currently executing request. */
struct lookup_intent *rpcl_it;
+ /** Used for MDS/RPC load testing purposes. */
int rpcl_fakes;
};
{
ENTRY;
- if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP))
+ if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP ||
+ it->it_op == IT_LAYOUT))
return;
/* This would normally block until the existing request finishes.
* the common case when it isn't true. */
while (unlikely(lck->rpcl_it == MDC_FAKE_RPCL_IT)) {
mutex_unlock(&lck->rpcl_mutex);
- cfs_schedule_timeout(cfs_time_seconds(1) / 4);
+ schedule_timeout(cfs_time_seconds(1) / 4);
goto again;
}
static inline void mdc_put_rpc_lock(struct mdc_rpc_lock *lck,
struct lookup_intent *it)
{
- if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP))
+ if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP ||
+ it->it_op == IT_LAYOUT))
goto out;
if (lck->rpcl_it == MDC_FAKE_RPCL_IT) { /* OBD_FAIL_MDC_RPCS_SEM */
struct mdc_cache_waiter {
- cfs_list_t mcw_entry;
- cfs_waitq_t mcw_waitq;
+ cfs_list_t mcw_entry;
+ wait_queue_head_t mcw_waitq;
};
/* mdc/mdc_locks.c */
-int it_disposition(struct lookup_intent *it, int flag);
+int it_disposition(const struct lookup_intent *it, int flag);
void it_clear_disposition(struct lookup_intent *it, int flag);
void it_set_disposition(struct lookup_intent *it, int flag);
int it_open_error(int phase, struct lookup_intent *it);
const struct page *page, int offset);
#endif
+static inline bool cl_is_lov_delay_create(unsigned int flags)
+{
+ return (flags & O_LOV_DELAY_CREATE_1_8) != 0 ||
+ (flags & O_LOV_DELAY_CREATE_MASK) == O_LOV_DELAY_CREATE_MASK;
+}
+
+static inline void cl_lov_delay_create_clear(unsigned int *flags)
+{
+ if ((*flags & O_LOV_DELAY_CREATE_1_8) != 0)
+ *flags &= ~O_LOV_DELAY_CREATE_1_8;
+ if ((*flags & O_LOV_DELAY_CREATE_MASK) == O_LOV_DELAY_CREATE_MASK)
+ *flags &= ~O_LOV_DELAY_CREATE_MASK;
+}
+
/** @} mdc */
#endif