struct netfs_io_request *netfs_alloc_request(const struct netfs_request_ops *ops,
void *netfs_priv,
struct file *file);
-void netfs_get_request(struct netfs_io_request *rreq);
+void netfs_get_request(struct netfs_io_request *rreq, enum netfs_rreq_ref_trace what);
void netfs_clear_subrequests(struct netfs_io_request *rreq, bool was_async);
-void netfs_put_request(struct netfs_io_request *rreq, bool was_async);
+void netfs_put_request(struct netfs_io_request *rreq, bool was_async,
+ enum netfs_rreq_ref_trace what);
struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq);
void netfs_put_subrequest(struct netfs_io_subrequest *subreq, bool was_async);
void netfs_get_subrequest(struct netfs_io_subrequest *subreq);
+static inline void netfs_see_request(struct netfs_io_request *rreq,
+ enum netfs_rreq_ref_trace what)
+{
+ trace_netfs_rreq_ref(rreq->debug_id, refcount_read(&rreq->ref), what);
+}
+
/*
* read_helper.c
*/
rreq->debug_id = atomic_inc_return(&debug_ids);
INIT_LIST_HEAD(&rreq->subrequests);
INIT_WORK(&rreq->work, netfs_rreq_work);
- refcount_set(&rreq->usage, 1);
+ refcount_set(&rreq->ref, 1);
__set_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags);
if (ops->init_request)
ops->init_request(rreq, file);
return rreq;
}
-void netfs_get_request(struct netfs_io_request *rreq)
+void netfs_get_request(struct netfs_io_request *rreq, enum netfs_rreq_ref_trace what)
{
- refcount_inc(&rreq->usage);
+ int r;
+
+ __refcount_inc(&rreq->ref, &r);
+ trace_netfs_rreq_ref(rreq->debug_id, r + 1, what);
}
void netfs_clear_subrequests(struct netfs_io_request *rreq, bool was_async)
netfs_stat_d(&netfs_n_rh_rreq);
}
-void netfs_put_request(struct netfs_io_request *rreq, bool was_async)
+void netfs_put_request(struct netfs_io_request *rreq, bool was_async,
+ enum netfs_rreq_ref_trace what)
{
- if (refcount_dec_and_test(&rreq->usage)) {
+ unsigned int debug_id = rreq->debug_id;
+ bool dead;
+ int r;
+
+ dead = __refcount_dec_and_test(&rreq->ref, &r);
+ trace_netfs_rreq_ref(debug_id, r - 1, what);
+ if (dead) {
if (was_async) {
rreq->work.func = netfs_free_request;
if (!queue_work(system_unbound_wq, &rreq->work))
INIT_LIST_HEAD(&subreq->rreq_link);
refcount_set(&subreq->usage, 2);
subreq->rreq = rreq;
- netfs_get_request(rreq);
+ netfs_get_request(rreq, netfs_rreq_trace_get_subreq);
netfs_stat(&netfs_n_rh_sreq);
}
trace_netfs_sreq(subreq, netfs_sreq_trace_free);
kfree(subreq);
netfs_stat_d(&netfs_n_rh_sreq);
- netfs_put_request(rreq, was_async);
+ netfs_put_request(rreq, was_async, netfs_rreq_trace_put_subreq);
}
void netfs_put_subrequest(struct netfs_io_subrequest *subreq, bool was_async)
{
trace_netfs_rreq(rreq, netfs_rreq_trace_done);
netfs_clear_subrequests(rreq, was_async);
- netfs_put_request(rreq, was_async);
+ netfs_put_request(rreq, was_async, netfs_rreq_trace_put_complete);
}
/*
return;
cleanup_free:
- netfs_put_request(rreq, false);
+ netfs_put_request(rreq, false, netfs_rreq_trace_put_failed);
return;
cleanup:
if (netfs_priv)
netfs_stat(&netfs_n_rh_readpage);
trace_netfs_read(rreq, rreq->start, rreq->len, netfs_read_trace_readpage);
- netfs_get_request(rreq);
+ netfs_get_request(rreq, netfs_rreq_trace_get_hold);
atomic_set(&rreq->nr_outstanding, 1);
do {
ret = -EIO;
}
out:
- netfs_put_request(rreq, false);
+ netfs_put_request(rreq, false, netfs_rreq_trace_put_hold);
return ret;
}
EXPORT_SYMBOL(netfs_readpage);
*/
ractl._nr_pages = folio_nr_pages(folio);
netfs_rreq_expand(rreq, &ractl);
- netfs_get_request(rreq);
/* We hold the folio locks, so we can drop the references */
folio_get(folio);
while (readahead_folio(&ractl))
;
+ netfs_get_request(rreq, netfs_rreq_trace_get_hold);
atomic_set(&rreq->nr_outstanding, 1);
do {
if (!netfs_rreq_submit_slice(rreq, &debug_index))
trace_netfs_failure(rreq, NULL, ret, netfs_fail_short_write_begin);
ret = -EIO;
}
- netfs_put_request(rreq, false);
+ netfs_put_request(rreq, false, netfs_rreq_trace_put_hold);
if (ret < 0)
goto error;
return 0;
error_put:
- netfs_put_request(rreq, false);
+ netfs_put_request(rreq, false, netfs_rreq_trace_put_failed);
error:
folio_unlock(folio);
folio_put(folio);
loff_t i_size; /* Size of the file */
loff_t start; /* Start position */
pgoff_t no_unlock_folio; /* Don't unlock this folio after read */
- refcount_t usage;
+ refcount_t ref;
unsigned long flags;
#define NETFS_RREQ_INCOMPLETE_IO 0 /* Some ioreqs terminated short or with error */
#define NETFS_RREQ_COPY_TO_CACHE 1 /* Need to write to the cache */
EM(netfs_fail_short_write_begin, "short-write-begin") \
E_(netfs_fail_prepare_write, "prep-write")
+#define netfs_rreq_ref_traces \
+ EM(netfs_rreq_trace_get_hold, "GET HOLD ") \
+ EM(netfs_rreq_trace_get_subreq, "GET SUBREQ ") \
+ EM(netfs_rreq_trace_put_complete, "PUT COMPLT ") \
+ EM(netfs_rreq_trace_put_failed, "PUT FAILED ") \
+ EM(netfs_rreq_trace_put_hold, "PUT HOLD ") \
+ EM(netfs_rreq_trace_put_subreq, "PUT SUBREQ ") \
+ E_(netfs_rreq_trace_new, "NEW ")
+
#ifndef __NETFS_DECLARE_TRACE_ENUMS_ONCE_ONLY
#define __NETFS_DECLARE_TRACE_ENUMS_ONCE_ONLY
enum netfs_rreq_trace { netfs_rreq_traces } __mode(byte);
enum netfs_sreq_trace { netfs_sreq_traces } __mode(byte);
enum netfs_failure { netfs_failures } __mode(byte);
+enum netfs_rreq_ref_trace { netfs_rreq_ref_traces } __mode(byte);
#endif
netfs_sreq_sources;
netfs_sreq_traces;
netfs_failures;
+netfs_rreq_ref_traces;
/*
* Now redefine the EM() and E_() macros to map the enums to the strings that
__entry->error)
);
+TRACE_EVENT(netfs_rreq_ref,
+ TP_PROTO(unsigned int rreq_debug_id, int ref,
+ enum netfs_rreq_ref_trace what),
+
+ TP_ARGS(rreq_debug_id, ref, what),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, rreq )
+ __field(int, ref )
+ __field(enum netfs_rreq_ref_trace, what )
+ ),
+
+ TP_fast_assign(
+ __entry->rreq = rreq_debug_id;
+ __entry->ref = ref;
+ __entry->what = what;
+ ),
+
+ TP_printk("R=%08x %s r=%u",
+ __entry->rreq,
+ __print_symbolic(__entry->what, netfs_rreq_ref_traces),
+ __entry->ref)
+ );
+
#undef EM
#undef E_
#endif /* _TRACE_NETFS_H */