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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
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8
include/linux/netfs.h
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@@ -18,6 +18,8 @@
#include <linux/fs.h>
#include <linux/pagemap.h>
enum netfs_sreq_ref_trace;
/*
* Overload PG_private_2 to give us PG_fscache - this is used to indicate that
* a page is currently backed by a local disk cache
@@ -136,7 +138,7 @@ struct netfs_io_subrequest {
loff_t start; /* Where to start the I/O */
size_t len; /* Size of the I/O */
size_t transferred; /* Amount of data transferred */
refcount_t usage;
refcount_t ref;
short error; /* 0 or error that occurred */
unsigned short debug_index; /* Index in list (for debugging output) */
enum netfs_io_source source; /* Where to read from/write to */
@@ -268,6 +270,10 @@ extern int netfs_write_begin(struct file *, struct address_space *,
void *);
extern void netfs_subreq_terminated(struct netfs_io_subrequest *, ssize_t, bool);
extern void netfs_get_subrequest(struct netfs_io_subrequest *subreq,
enum netfs_sreq_ref_trace what);
extern void netfs_put_subrequest(struct netfs_io_subrequest *subreq,
bool was_async, enum netfs_sreq_ref_trace what);
extern void netfs_stats_show(struct seq_file *);
#endif /* _LINUX_NETFS_H */