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linux/include/trace/events/dlm.h
Alexander Aring 5d92a30e90 fs: dlm: add resource name to tracepoints 
This patch adds the resource name to dlm tracepoints.  The name
usually comes through the lkb_resource, but in some cases a resource
may not yet be associated with an lkb, in which case the name and
namelen parameters are used.

It should be okay to access the lkb_resource and the res_name field at
the time when the tracepoint is invoked. The resource is assigned to a
lkb and it's reference is being held during the tracepoint call. During
this time the resource cannot be freed. Also a lkb will never switch
its assigned resource. The name of a dlm_rsb is assigned at creation
time and should never be changed during runtime as well.

The TP_printk() call uses always a hexadecimal string array
representation for the resource name (which is not necessarily ascii.)

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
2022-06-24 11:53:09 -05:00

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/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM dlm
#if !defined(_TRACE_DLM_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_DLM_H
#include <linux/dlm.h>
#include <linux/dlmconstants.h>
#include <linux/tracepoint.h>
#include "../../../fs/dlm/dlm_internal.h"
#define show_lock_flags(flags) __print_flags(flags, "|", \
{ DLM_LKF_NOQUEUE, "NOQUEUE" }, \
{ DLM_LKF_CANCEL, "CANCEL" }, \
{ DLM_LKF_CONVERT, "CONVERT" }, \
{ DLM_LKF_VALBLK, "VALBLK" }, \
{ DLM_LKF_QUECVT, "QUECVT" }, \
{ DLM_LKF_IVVALBLK, "IVVALBLK" }, \
{ DLM_LKF_CONVDEADLK, "CONVDEADLK" }, \
{ DLM_LKF_PERSISTENT, "PERSISTENT" }, \
{ DLM_LKF_NODLCKWT, "NODLCKWT" }, \
{ DLM_LKF_NODLCKBLK, "NODLCKBLK" }, \
{ DLM_LKF_EXPEDITE, "EXPEDITE" }, \
{ DLM_LKF_NOQUEUEBAST, "NOQUEUEBAST" }, \
{ DLM_LKF_HEADQUE, "HEADQUE" }, \
{ DLM_LKF_NOORDER, "NOORDER" }, \
{ DLM_LKF_ORPHAN, "ORPHAN" }, \
{ DLM_LKF_ALTPR, "ALTPR" }, \
{ DLM_LKF_ALTCW, "ALTCW" }, \
{ DLM_LKF_FORCEUNLOCK, "FORCEUNLOCK" }, \
{ DLM_LKF_TIMEOUT, "TIMEOUT" })
#define show_lock_mode(mode) __print_symbolic(mode, \
{ DLM_LOCK_IV, "IV"}, \
{ DLM_LOCK_NL, "NL"}, \
{ DLM_LOCK_CR, "CR"}, \
{ DLM_LOCK_CW, "CW"}, \
{ DLM_LOCK_PR, "PR"}, \
{ DLM_LOCK_PW, "PW"}, \
{ DLM_LOCK_EX, "EX"})
#define show_dlm_sb_flags(flags) __print_flags(flags, "|", \
{ DLM_SBF_DEMOTED, "DEMOTED" }, \
{ DLM_SBF_VALNOTVALID, "VALNOTVALID" }, \
{ DLM_SBF_ALTMODE, "ALTMODE" })
/* note: we begin tracing dlm_lock_start() only if ls and lkb are found */
TRACE_EVENT(dlm_lock_start,
TP_PROTO(struct dlm_ls *ls, struct dlm_lkb *lkb, void *name,
unsigned int namelen, int mode, __u32 flags),
TP_ARGS(ls, lkb, name, namelen, mode, flags),
TP_STRUCT__entry(
__field(__u32, ls_id)
__field(__u32, lkb_id)
__field(int, mode)
__field(__u32, flags)
__dynamic_array(unsigned char, res_name,
lkb->lkb_resource ? lkb->lkb_resource->res_length : namelen)
),
TP_fast_assign(
struct dlm_rsb *r;
__entry->ls_id = ls->ls_global_id;
__entry->lkb_id = lkb->lkb_id;
__entry->mode = mode;
__entry->flags = flags;
r = lkb->lkb_resource;
if (r)
memcpy(__get_dynamic_array(res_name), r->res_name,
__get_dynamic_array_len(res_name));
else if (name)
memcpy(__get_dynamic_array(res_name), name,
__get_dynamic_array_len(res_name));
),
TP_printk("ls_id=%u lkb_id=%x mode=%s flags=%s res_name=%s",
__entry->ls_id, __entry->lkb_id,
show_lock_mode(__entry->mode),
show_lock_flags(__entry->flags),
__print_hex_str(__get_dynamic_array(res_name),
__get_dynamic_array_len(res_name)))
);
TRACE_EVENT(dlm_lock_end,
TP_PROTO(struct dlm_ls *ls, struct dlm_lkb *lkb, void *name,
unsigned int namelen, int mode, __u32 flags, int error),
TP_ARGS(ls, lkb, name, namelen, mode, flags, error),
TP_STRUCT__entry(
__field(__u32, ls_id)
__field(__u32, lkb_id)
__field(int, mode)
__field(__u32, flags)
__field(int, error)
__dynamic_array(unsigned char, res_name,
lkb->lkb_resource ? lkb->lkb_resource->res_length : namelen)
),
TP_fast_assign(
struct dlm_rsb *r;
__entry->ls_id = ls->ls_global_id;
__entry->lkb_id = lkb->lkb_id;
__entry->mode = mode;
__entry->flags = flags;
r = lkb->lkb_resource;
if (r)
memcpy(__get_dynamic_array(res_name), r->res_name,
__get_dynamic_array_len(res_name));
else if (name)
memcpy(__get_dynamic_array(res_name), name,
__get_dynamic_array_len(res_name));
/* return value will be zeroed in those cases by dlm_lock()
* we do it here again to not introduce more overhead if
* trace isn't running and error reflects the return value.
*/
if (error == -EAGAIN || error == -EDEADLK)
__entry->error = 0;
else
__entry->error = error;
),
TP_printk("ls_id=%u lkb_id=%x mode=%s flags=%s error=%d res_name=%s",
__entry->ls_id, __entry->lkb_id,
show_lock_mode(__entry->mode),
show_lock_flags(__entry->flags), __entry->error,
__print_hex_str(__get_dynamic_array(res_name),
__get_dynamic_array_len(res_name)))
);
TRACE_EVENT(dlm_bast,
TP_PROTO(struct dlm_ls *ls, struct dlm_lkb *lkb, int mode),
TP_ARGS(ls, lkb, mode),
TP_STRUCT__entry(
__field(__u32, ls_id)
__field(__u32, lkb_id)
__field(int, mode)
__dynamic_array(unsigned char, res_name,
lkb->lkb_resource ? lkb->lkb_resource->res_length : 0)
),
TP_fast_assign(
struct dlm_rsb *r;
__entry->ls_id = ls->ls_global_id;
__entry->lkb_id = lkb->lkb_id;
__entry->mode = mode;
r = lkb->lkb_resource;
if (r)
memcpy(__get_dynamic_array(res_name), r->res_name,
__get_dynamic_array_len(res_name));
),
TP_printk("ls_id=%u lkb_id=%x mode=%s res_name=%s",
__entry->ls_id, __entry->lkb_id,
show_lock_mode(__entry->mode),
__print_hex_str(__get_dynamic_array(res_name),
__get_dynamic_array_len(res_name)))
);
TRACE_EVENT(dlm_ast,
TP_PROTO(struct dlm_ls *ls, struct dlm_lkb *lkb),
TP_ARGS(ls, lkb),
TP_STRUCT__entry(
__field(__u32, ls_id)
__field(__u32, lkb_id)
__field(u8, sb_flags)
__field(int, sb_status)
__dynamic_array(unsigned char, res_name,
lkb->lkb_resource ? lkb->lkb_resource->res_length : 0)
),
TP_fast_assign(
struct dlm_rsb *r;
__entry->ls_id = ls->ls_global_id;
__entry->lkb_id = lkb->lkb_id;
__entry->sb_flags = lkb->lkb_lksb->sb_flags;
__entry->sb_status = lkb->lkb_lksb->sb_status;
r = lkb->lkb_resource;
if (r)
memcpy(__get_dynamic_array(res_name), r->res_name,
__get_dynamic_array_len(res_name));
),
TP_printk("ls_id=%u lkb_id=%x sb_flags=%s sb_status=%d res_name=%s",
__entry->ls_id, __entry->lkb_id,
show_dlm_sb_flags(__entry->sb_flags), __entry->sb_status,
__print_hex_str(__get_dynamic_array(res_name),
__get_dynamic_array_len(res_name)))
);
/* note: we begin tracing dlm_unlock_start() only if ls and lkb are found */
TRACE_EVENT(dlm_unlock_start,
TP_PROTO(struct dlm_ls *ls, struct dlm_lkb *lkb, __u32 flags),
TP_ARGS(ls, lkb, flags),
TP_STRUCT__entry(
__field(__u32, ls_id)
__field(__u32, lkb_id)
__field(__u32, flags)
__dynamic_array(unsigned char, res_name,
lkb->lkb_resource ? lkb->lkb_resource->res_length : 0)
),
TP_fast_assign(
struct dlm_rsb *r;
__entry->ls_id = ls->ls_global_id;
__entry->lkb_id = lkb->lkb_id;
__entry->flags = flags;
r = lkb->lkb_resource;
if (r)
memcpy(__get_dynamic_array(res_name), r->res_name,
__get_dynamic_array_len(res_name));
),
TP_printk("ls_id=%u lkb_id=%x flags=%s res_name=%s",
__entry->ls_id, __entry->lkb_id,
show_lock_flags(__entry->flags),
__print_hex_str(__get_dynamic_array(res_name),
__get_dynamic_array_len(res_name)))
);
TRACE_EVENT(dlm_unlock_end,
TP_PROTO(struct dlm_ls *ls, struct dlm_lkb *lkb, __u32 flags,
int error),
TP_ARGS(ls, lkb, flags, error),
TP_STRUCT__entry(
__field(__u32, ls_id)
__field(__u32, lkb_id)
__field(__u32, flags)
__field(int, error)
__dynamic_array(unsigned char, res_name,
lkb->lkb_resource ? lkb->lkb_resource->res_length : 0)
),
TP_fast_assign(
struct dlm_rsb *r;
__entry->ls_id = ls->ls_global_id;
__entry->lkb_id = lkb->lkb_id;
__entry->flags = flags;
__entry->error = error;
r = lkb->lkb_resource;
if (r)
memcpy(__get_dynamic_array(res_name), r->res_name,
__get_dynamic_array_len(res_name));
),
TP_printk("ls_id=%u lkb_id=%x flags=%s error=%d res_name=%s",
__entry->ls_id, __entry->lkb_id,
show_lock_flags(__entry->flags), __entry->error,
__print_hex_str(__get_dynamic_array(res_name),
__get_dynamic_array_len(res_name)))
);
TRACE_EVENT(dlm_send,
TP_PROTO(int nodeid, int ret),
TP_ARGS(nodeid, ret),
TP_STRUCT__entry(
__field(int, nodeid)
__field(int, ret)
),
TP_fast_assign(
__entry->nodeid = nodeid;
__entry->ret = ret;
),
TP_printk("nodeid=%d ret=%d", __entry->nodeid, __entry->ret)
);
TRACE_EVENT(dlm_recv,
TP_PROTO(int nodeid, int ret),
TP_ARGS(nodeid, ret),
TP_STRUCT__entry(
__field(int, nodeid)
__field(int, ret)
),
TP_fast_assign(
__entry->nodeid = nodeid;
__entry->ret = ret;
),
TP_printk("nodeid=%d ret=%d", __entry->nodeid, __entry->ret)
);
#endif /* if !defined(_TRACE_DLM_H) || defined(TRACE_HEADER_MULTI_READ) */
/* This part must be outside protection */
#include <trace/define_trace.h>
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