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netfs: Trace refcounting on the netfs_io_subrequest struct

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Add refcount tracing for the netfs_io_subrequest structure.

Changes
=======
ver #3)
 - Switch 'W=' to 'R=' in the traceline to match other request debug IDs.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com

Link: https://lore.kernel.org/r/164622998584.3564931.5052255990645723639.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/164678202603.1200972.14726007419792315578.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/164692901860.2099075.4845820886851239935.stgit@warthog.procyon.org.uk/ # v3
This commit is contained in:
David Howells
2022-02-17 15:01:24 +00:00
parent de74023bef
commit 6cd3d6fd1f
5 changed files with 81 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
fs/netfs/objects.c
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@@ -53,7 +53,8 @@ void netfs_clear_subrequests(struct netfs_io_request *rreq, bool was_async)
subreq = list_first_entry(&rreq->subrequests,
struct netfs_io_subrequest, rreq_link);
list_del(&subreq->rreq_link);
netfs_put_subrequest(subreq, was_async);
netfs_put_subrequest(subreq, was_async,
netfs_sreq_trace_put_clear);
}
}
@@ -101,7 +102,7 @@ struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq
subreq = kzalloc(sizeof(struct netfs_io_subrequest), GFP_KERNEL);
if (subreq) {
INIT_LIST_HEAD(&subreq->rreq_link);
refcount_set(&subreq->usage, 2);
refcount_set(&subreq->ref, 2);
subreq->rreq = rreq;
netfs_get_request(rreq, netfs_rreq_trace_get_subreq);
netfs_stat(&netfs_n_rh_sreq);
@@ -110,13 +111,18 @@ struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq
return subreq;
}
void netfs_get_subrequest(struct netfs_io_subrequest *subreq)
void netfs_get_subrequest(struct netfs_io_subrequest *subreq,
enum netfs_sreq_ref_trace what)
{
refcount_inc(&subreq->usage);
int r;
__refcount_inc(&subreq->ref, &r);
trace_netfs_sreq_ref(subreq->rreq->debug_id, subreq->debug_index, r + 1,
what);
}
static void __netfs_put_subrequest(struct netfs_io_subrequest *subreq,
bool was_async)
static void netfs_free_subrequest(struct netfs_io_subrequest *subreq,
bool was_async)
{
struct netfs_io_request *rreq = subreq->rreq;
@@ -126,8 +132,16 @@ static void __netfs_put_subrequest(struct netfs_io_subrequest *subreq,
netfs_put_request(rreq, was_async, netfs_rreq_trace_put_subreq);
}
void netfs_put_subrequest(struct netfs_io_subrequest *subreq, bool was_async)
void netfs_put_subrequest(struct netfs_io_subrequest *subreq, bool was_async,
enum netfs_sreq_ref_trace what)
{
if (refcount_dec_and_test(&subreq->usage))
__netfs_put_subrequest(subreq, was_async);
unsigned int debug_index = subreq->debug_index;
unsigned int debug_id = subreq->rreq->debug_id;
bool dead;
int r;
dead = __refcount_dec_and_test(&subreq->ref, &r);
trace_netfs_sreq_ref(debug_id, debug_index, r - 1, what);
if (dead)
netfs_free_subrequest(subreq, was_async);
}