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linux/include/trace/events/netfs.h
David Howells 4090b31422 netfs: Add a function to consolidate beginning a read 
Add a function to do the steps needed to begin a read request, allowing
this code to be removed from several other functions and consolidated.

Changes
=======
ver #2)
 - Move before the unstaticking patch so that some functions can be left
   static.
 - Set uninitialised return code in netfs_begin_read()[1][2].
 - Fixed a refleak caused by non-removal of a get from netfs_write_begin()
   when the request submission code got moved to netfs_begin_read().
 - Use INIT_WORK() to (re-)init the request work_struct[3].

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/20220303163826.1120936-1-nathan@kernel.org/ [1]
Link: https://lore.kernel.org/r/20220303235647.1297171-1-colin.i.king@gmail.com/ [2]
Link: https://lore.kernel.org/r/9d69be49081bccff44260e4c6e0049c63d6d04a1.camel@redhat.com/ [3]
Link: https://lore.kernel.org/r/164623004355.3564931.7275693529042495641.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/164678214287.1200972.16734134007649832160.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/164692911113.2099075.1060868473229451371.stgit@warthog.procyon.org.uk/ # v3
2022-03-18 09:29:05 +00:00

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Network filesystem support module tracepoints
*
* Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#undef TRACE_SYSTEM
#define TRACE_SYSTEM netfs
#if !defined(_TRACE_NETFS_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_NETFS_H
#include <linux/tracepoint.h>
/*
* Define enums for tracing information.
*/
#define netfs_read_traces \
EM(netfs_read_trace_expanded, "EXPANDED ") \
EM(netfs_read_trace_readahead, "READAHEAD") \
EM(netfs_read_trace_readpage, "READPAGE ") \
E_(netfs_read_trace_write_begin, "WRITEBEGN")
#define netfs_rreq_origins \
EM(NETFS_READAHEAD, "RA") \
EM(NETFS_READPAGE, "RP") \
E_(NETFS_READ_FOR_WRITE, "RW")
#define netfs_rreq_traces \
EM(netfs_rreq_trace_assess, "ASSESS ") \
EM(netfs_rreq_trace_copy, "COPY ") \
EM(netfs_rreq_trace_done, "DONE ") \
EM(netfs_rreq_trace_free, "FREE ") \
EM(netfs_rreq_trace_resubmit, "RESUBMT") \
EM(netfs_rreq_trace_unlock, "UNLOCK ") \
E_(netfs_rreq_trace_unmark, "UNMARK ")
#define netfs_sreq_sources \
EM(NETFS_FILL_WITH_ZEROES, "ZERO") \
EM(NETFS_DOWNLOAD_FROM_SERVER, "DOWN") \
EM(NETFS_READ_FROM_CACHE, "READ") \
E_(NETFS_INVALID_READ, "INVL") \
#define netfs_sreq_traces \
EM(netfs_sreq_trace_download_instead, "RDOWN") \
EM(netfs_sreq_trace_free, "FREE ") \
EM(netfs_sreq_trace_prepare, "PREP ") \
EM(netfs_sreq_trace_resubmit_short, "SHORT") \
EM(netfs_sreq_trace_submit, "SUBMT") \
EM(netfs_sreq_trace_terminated, "TERM ") \
EM(netfs_sreq_trace_write, "WRITE") \
EM(netfs_sreq_trace_write_skip, "SKIP ") \
E_(netfs_sreq_trace_write_term, "WTERM")
#define netfs_failures \
EM(netfs_fail_check_write_begin, "check-write-begin") \
EM(netfs_fail_copy_to_cache, "copy-to-cache") \
EM(netfs_fail_read, "read") \
EM(netfs_fail_short_read, "short-read") \
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_discard, "PUT DISCARD") \
EM(netfs_rreq_trace_put_failed, "PUT FAILED ") \
EM(netfs_rreq_trace_put_hold, "PUT HOLD ") \
EM(netfs_rreq_trace_put_subreq, "PUT SUBREQ ") \
EM(netfs_rreq_trace_put_zero_len, "PUT ZEROLEN") \
E_(netfs_rreq_trace_new, "NEW ")
#define netfs_sreq_ref_traces \
EM(netfs_sreq_trace_get_copy_to_cache, "GET COPY2C ") \
EM(netfs_sreq_trace_get_resubmit, "GET RESUBMIT") \
EM(netfs_sreq_trace_get_short_read, "GET SHORTRD") \
EM(netfs_sreq_trace_new, "NEW ") \
EM(netfs_sreq_trace_put_clear, "PUT CLEAR ") \
EM(netfs_sreq_trace_put_failed, "PUT FAILED ") \
EM(netfs_sreq_trace_put_merged, "PUT MERGED ") \
EM(netfs_sreq_trace_put_no_copy, "PUT NO COPY") \
E_(netfs_sreq_trace_put_terminated, "PUT TERM ")
#ifndef __NETFS_DECLARE_TRACE_ENUMS_ONCE_ONLY
#define __NETFS_DECLARE_TRACE_ENUMS_ONCE_ONLY
#undef EM
#undef E_
#define EM(a, b) a,
#define E_(a, b) a
enum netfs_read_trace { netfs_read_traces } __mode(byte);
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);
enum netfs_sreq_ref_trace { netfs_sreq_ref_traces } __mode(byte);
#endif
/*
* Export enum symbols via userspace.
*/
#undef EM
#undef E_
#define EM(a, b) TRACE_DEFINE_ENUM(a);
#define E_(a, b) TRACE_DEFINE_ENUM(a);
netfs_read_traces;
netfs_rreq_origins;
netfs_rreq_traces;
netfs_sreq_sources;
netfs_sreq_traces;
netfs_failures;
netfs_rreq_ref_traces;
netfs_sreq_ref_traces;
/*
* Now redefine the EM() and E_() macros to map the enums to the strings that
* will be printed in the output.
*/
#undef EM
#undef E_
#define EM(a, b) { a, b },
#define E_(a, b) { a, b }
TRACE_EVENT(netfs_read,
TP_PROTO(struct netfs_io_request *rreq,
loff_t start, size_t len,
enum netfs_read_trace what),
TP_ARGS(rreq, start, len, what),
TP_STRUCT__entry(
__field(unsigned int, rreq )
__field(unsigned int, cookie )
__field(loff_t, start )
__field(size_t, len )
__field(enum netfs_read_trace, what )
__field(unsigned int, netfs_inode )
),
TP_fast_assign(
__entry->rreq = rreq->debug_id;
__entry->cookie = rreq->cache_resources.debug_id;
__entry->start = start;
__entry->len = len;
__entry->what = what;
__entry->netfs_inode = rreq->inode->i_ino;
),
TP_printk("R=%08x %s c=%08x ni=%x s=%llx %zx",
__entry->rreq,
__print_symbolic(__entry->what, netfs_read_traces),
__entry->cookie,
__entry->netfs_inode,
__entry->start, __entry->len)
);
TRACE_EVENT(netfs_rreq,
TP_PROTO(struct netfs_io_request *rreq,
enum netfs_rreq_trace what),
TP_ARGS(rreq, what),
TP_STRUCT__entry(
__field(unsigned int, rreq )
__field(unsigned int, flags )
__field(enum netfs_io_origin, origin )
__field(enum netfs_rreq_trace, what )
),
TP_fast_assign(
__entry->rreq = rreq->debug_id;
__entry->flags = rreq->flags;
__entry->origin = rreq->origin;
__entry->what = what;
),
TP_printk("R=%08x %s %s f=%02x",
__entry->rreq,
__print_symbolic(__entry->origin, netfs_rreq_origins),
__print_symbolic(__entry->what, netfs_rreq_traces),
__entry->flags)
);
TRACE_EVENT(netfs_sreq,
TP_PROTO(struct netfs_io_subrequest *sreq,
enum netfs_sreq_trace what),
TP_ARGS(sreq, what),
TP_STRUCT__entry(
__field(unsigned int, rreq )
__field(unsigned short, index )
__field(short, error )
__field(unsigned short, flags )
__field(enum netfs_io_source, source )
__field(enum netfs_sreq_trace, what )
__field(size_t, len )
__field(size_t, transferred )
__field(loff_t, start )
),
TP_fast_assign(
__entry->rreq = sreq->rreq->debug_id;
__entry->index = sreq->debug_index;
__entry->error = sreq->error;
__entry->flags = sreq->flags;
__entry->source = sreq->source;
__entry->what = what;
__entry->len = sreq->len;
__entry->transferred = sreq->transferred;
__entry->start = sreq->start;
),
TP_printk("R=%08x[%u] %s %s f=%02x s=%llx %zx/%zx e=%d",
__entry->rreq, __entry->index,
__print_symbolic(__entry->source, netfs_sreq_sources),
__print_symbolic(__entry->what, netfs_sreq_traces),
__entry->flags,
__entry->start, __entry->transferred, __entry->len,
__entry->error)
);
TRACE_EVENT(netfs_failure,
TP_PROTO(struct netfs_io_request *rreq,
struct netfs_io_subrequest *sreq,
int error, enum netfs_failure what),
TP_ARGS(rreq, sreq, error, what),
TP_STRUCT__entry(
__field(unsigned int, rreq )
__field(short, index )
__field(short, error )
__field(unsigned short, flags )
__field(enum netfs_io_source, source )
__field(enum netfs_failure, what )
__field(size_t, len )
__field(size_t, transferred )
__field(loff_t, start )
),
TP_fast_assign(
__entry->rreq = rreq->debug_id;
__entry->index = sreq ? sreq->debug_index : -1;
__entry->error = error;
__entry->flags = sreq ? sreq->flags : 0;
__entry->source = sreq ? sreq->source : NETFS_INVALID_READ;
__entry->what = what;
__entry->len = sreq ? sreq->len : rreq->len;
__entry->transferred = sreq ? sreq->transferred : 0;
__entry->start = sreq ? sreq->start : 0;
),
TP_printk("R=%08x[%d] %s f=%02x s=%llx %zx/%zx %s e=%d",
__entry->rreq, __entry->index,
__print_symbolic(__entry->source, netfs_sreq_sources),
__entry->flags,
__entry->start, __entry->transferred, __entry->len,
__print_symbolic(__entry->what, netfs_failures),
__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)
);
TRACE_EVENT(netfs_sreq_ref,
TP_PROTO(unsigned int rreq_debug_id, unsigned int subreq_debug_index,
int ref, enum netfs_sreq_ref_trace what),
TP_ARGS(rreq_debug_id, subreq_debug_index, ref, what),
TP_STRUCT__entry(
__field(unsigned int, rreq )
__field(unsigned int, subreq )
__field(int, ref )
__field(enum netfs_sreq_ref_trace, what )
),
TP_fast_assign(
__entry->rreq = rreq_debug_id;
__entry->subreq = subreq_debug_index;
__entry->ref = ref;
__entry->what = what;
),
TP_printk("R=%08x[%x] %s r=%u",
__entry->rreq,
__entry->subreq,
__print_symbolic(__entry->what, netfs_sreq_ref_traces),
__entry->ref)
);
#undef EM
#undef E_
#endif /* _TRACE_NETFS_H */
/* This part must be outside protection */
#include <trace/define_trace.h>
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