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Wed, 06 Aug 2025 16:38:58 -0400 X-MC-Unique: aUjvRjiSPrW4rVH7nx40lQ-1 X-Mimecast-MFC-AGG-ID: aUjvRjiSPrW4rVH7nx40lQ_1754512737 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id E596A1800359; Wed, 6 Aug 2025 20:38:56 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.42.28.17]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id C486A180035C; Wed, 6 Aug 2025 20:38:53 +0000 (UTC) From: David Howells To: Steve French Cc: David Howells , Paulo Alcantara , Shyam Prasad N , Tom Talpey , Wang Zhaolong , Stefan Metzmacher , Mina Almasry , linux-cifs@vger.kernel.org, linux-kernel@vger.kernel.org, netfs@lists.linux.dev, linux-fsdevel@vger.kernel.org Subject: [RFC PATCH 21/31] cifs: [DEBUG] smb_message refcounting Date: Wed, 6 Aug 2025 21:36:42 +0100 Message-ID: <20250806203705.2560493-22-dhowells@redhat.com> In-Reply-To: <20250806203705.2560493-1-dhowells@redhat.com> References: <20250806203705.2560493-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Content-Type: text/plain; charset="utf-8" Signed-off-by: David Howells cc: Steve French cc: Paulo Alcantara cc: Shyam Prasad N cc: Tom Talpey cc: linux-cifs@vger.kernel.org cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org --- fs/smb/client/cifsglob.h | 1 + fs/smb/client/cifsproto.h | 5 +-- fs/smb/client/connect.c | 14 +++++--- fs/smb/client/smb2ops.c | 3 +- fs/smb/client/smb2pdu.c | 6 ++-- fs/smb/client/smb2transport.c | 2 +- fs/smb/client/trace.h | 61 +++++++++++++++++++++++++++++++++++ fs/smb/client/transport.c | 57 ++++++++++++++++++++++++++------ 8 files changed, 127 insertions(+), 22 deletions(-) diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h index 14b132fb14e0..045a29cedf0e 100644 --- a/fs/smb/client/cifsglob.h +++ b/fs/smb/client/cifsglob.h @@ -1734,6 +1734,7 @@ struct smb_message { void *request; /* Pointer to request message body */ wait_queue_head_t waitq; /* Wait queue for message events */ refcount_t ref; + unsigned int debug_id; /* Debugging ID for tracing */ bool sensitive; /* Request contains sensitive data */ bool cancelled; /* T if cancelled */ unsigned int sr_flags; /* Flags passed to send_recv() */ diff --git a/fs/smb/client/cifsproto.h b/fs/smb/client/cifsproto.h index abae67d83499..074b65bb57a5 100644 --- a/fs/smb/client/cifsproto.h +++ b/fs/smb/client/cifsproto.h @@ -761,8 +761,9 @@ static inline void cifs_free_open_info(struct cifs_open= _info_data *data) } =20 struct smb_message *smb_message_alloc(enum smb2_command cmd, gfp_t gfp); -void smb_get_message(struct smb_message *smb); -void smb_put_message(struct smb_message *smb); +void smb_see_message(struct smb_message *smb, enum smb_message_trace trace= ); +void smb_get_message(struct smb_message *smb, enum smb_message_trace trace= ); +void smb_put_message(struct smb_message *smb, enum smb_message_trace trace= ); void smb_put_messages(struct smb_message *smb); =20 #endif /* _CIFSPROTO_H */ diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c index 9bd19dd91d35..74b88304a782 100644 --- a/fs/smb/client/connect.c +++ b/fs/smb/client/connect.c @@ -323,6 +323,7 @@ cifs_abort_connection(struct TCP_Server_Info *server) cifs_dbg(FYI, "%s: moving mids to private list\n", __func__); spin_lock(&server->mid_lock); list_for_each_entry_safe(smb, nsmb, &server->pending_mid_q, qhead) { + smb_see_message(smb, smb_message_trace_see_abort_conn); if (smb->mid_state =3D=3D MID_REQUEST_SUBMITTED) smb->mid_state =3D MID_RETRY_NEEDED; list_move(&smb->qhead, &retry_list); @@ -335,7 +336,7 @@ cifs_abort_connection(struct TCP_Server_Info *server) list_for_each_entry_safe(smb, nsmb, &retry_list, qhead) { list_del_init(&smb->qhead); smb->callback(server, smb); - smb_put_message(smb); + smb_put_message(smb, smb_message_trace_put_abort_conn); } =20 if (cifs_rdma_enabled(server)) { @@ -885,6 +886,7 @@ is_smb_response(struct TCP_Server_Info *server, unsigne= d char type) */ spin_lock(&server->mid_lock); list_for_each_entry_safe(smb, nsmb, &server->pending_mid_q, qhead) { + smb_see_message(smb, smb_message_trace_see_is_smb_resp); list_move(&smb->qhead, &dispose_list); smb->mid_flags |=3D MID_DELETED; } @@ -918,7 +920,7 @@ is_smb_response(struct TCP_Server_Info *server, unsigne= d char type) smb->mid_rc =3D mid_rc; smb->mid_state =3D MID_RC; smb->callback(server, smb); - smb_put_message(smb); + smb_put_message(smb, smb_message_trace_put_is_smb_resp); } =20 /* @@ -968,6 +970,7 @@ dequeue_mid(struct smb_message *smb, bool malformed) spin_unlock(&smb->server->mid_lock); pr_warn_once("trying to dequeue a deleted mid\n"); } else { + smb_see_message(smb, smb_message_trace_see_dequeue_mid); list_del_init(&smb->qhead); smb->mid_flags |=3D MID_DELETED; spin_unlock(&smb->server->mid_lock); @@ -1101,6 +1104,7 @@ clean_demultiplex_info(struct TCP_Server_Info *server) spin_lock(&server->mid_lock); list_for_each_entry_safe(smb, smb2, &server->pending_mid_q, qhead) { cifs_dbg(FYI, "Clearing mid %llu\n", smb->mid); + smb_see_message(smb, smb_message_trace_see_clean_demux); smb->mid_state =3D MID_SHUTDOWN; list_move(&smb->qhead, &dispose_list); smb->mid_flags |=3D MID_DELETED; @@ -1112,7 +1116,7 @@ clean_demultiplex_info(struct TCP_Server_Info *server) cifs_dbg(FYI, "Callback mid %llu\n", smb->mid); list_del_init(&smb->qhead); smb->callback(server, smb); - smb_put_message(smb); + smb_put_message(smb, smb_message_trace_put_clean_demux); } /* 1/8th of sec is more than enough time for them to exit */ msleep(125); @@ -1355,7 +1359,7 @@ cifs_demultiplex_thread(void *p) if (length < 0) { for (i =3D 0; i < num_smbs; i++) if (smbs[i]) - smb_put_message(smbs[i]); + smb_put_message(smbs[i], smb_message_trace_put_demux); continue; } =20 @@ -1390,7 +1394,7 @@ cifs_demultiplex_thread(void *p) if (!smbs[i]->multiRsp || smbs[i]->multiEnd) smbs[i]->callback(server, smbs[i]); =20 - smb_put_message(smbs[i]); + smb_put_message(smbs[i], smb_message_trace_put_demux_cb); } else if (server->ops->is_oplock_break && server->ops->is_oplock_break(bufs[i], server)) { diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c index 63226bbba3d1..1e24489b55e3 100644 --- a/fs/smb/client/smb2ops.c +++ b/fs/smb/client/smb2ops.c @@ -408,6 +408,7 @@ __smb2_find_mid(struct TCP_Server_Info *server, char *b= uf, bool dequeue) if ((smb->mid =3D=3D wire_mid) && (smb->mid_state =3D=3D MID_REQUEST_SUBMITTED) && (smb->command_id =3D=3D command)) { + smb_see_message(smb, smb_message_trace_see_find_mid); if (dequeue) { list_del_init(&smb->qhead); smb->mid_flags |=3D MID_DELETED; @@ -4726,7 +4727,7 @@ static void smb2_decrypt_offload(struct work_struct *= work) spin_unlock(&dw->server->srv_lock); } } - smb_put_message(smb); + smb_put_message(smb, smb_message_trace_put_decrypt_offload); } =20 free_pages: diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c index 8d50036fd028..3009acf0d884 100644 --- a/fs/smb/client/smb2pdu.c +++ b/fs/smb/client/smb2pdu.c @@ -4305,7 +4305,7 @@ SMB2_echo(struct TCP_Server_Info *server) cifs_dbg(FYI, "Echo request failed: %d\n", rc); =20 cifs_small_buf_release(req); - smb_put_message(smb); + smb_put_messages(smb); return rc; } =20 @@ -4753,7 +4753,7 @@ smb2_async_readv(struct cifs_io_subrequest *rdata) =20 async_readv_out: cifs_small_buf_release(buf); - smb_put_message(smb); + smb_put_messages(smb); return rc; } =20 @@ -5127,7 +5127,7 @@ smb2_async_writev(struct cifs_io_subrequest *wdata) =20 async_writev_out: cifs_small_buf_release(req); - smb_put_message(smb); + smb_put_messages(smb); out: if (rc) { trace_smb3_rw_credits(wdata->rreq->debug_id, diff --git a/fs/smb/client/smb2transport.c b/fs/smb/client/smb2transport.c index 7194082bb5ac..da6377521fe9 100644 --- a/fs/smb/client/smb2transport.c +++ b/fs/smb/client/smb2transport.c @@ -801,7 +801,7 @@ smb2_get_mid_entry(struct cifs_ses *ses, struct TCP_Ser= ver_Info *server, =20 smb2_init_mid(smb, server); =20 - smb_get_message(smb); + smb_get_message(smb, smb_message_trace_get_enqueue_sync); spin_lock(&server->mid_lock); list_add_tail(&smb->qhead, &server->pending_mid_q); spin_unlock(&server->mid_lock); diff --git a/fs/smb/client/trace.h b/fs/smb/client/trace.h index 93e5b2bb9f28..5cee63960419 100644 --- a/fs/smb/client/trace.h +++ b/fs/smb/client/trace.h @@ -20,6 +20,45 @@ /* * Specify enums for tracing information. */ +#define smb_message_traces \ + EM(smb_message_trace_alloc_cancel, "AL Cancel ") \ + EM(smb_message_trace_alloc_change_notify, "AL Change-Nfy") \ + EM(smb_message_trace_alloc_close, "AL Close ") \ + EM(smb_message_trace_alloc_create, "AL Create ") \ + EM(smb_message_trace_alloc_echo, "AL Echo ") \ + EM(smb_message_trace_alloc_flush, "AL Flush ") \ + EM(smb_message_trace_alloc_ioctl, "AL Ioctl ") \ + EM(smb_message_trace_alloc_lock, "AL Lock ") \ + EM(smb_message_trace_alloc_logoff, "AL Logoff ") \ + EM(smb_message_trace_alloc_negotiate, "AL Negotiate ") \ + EM(smb_message_trace_alloc_oplock_break, "AL Oplock-Brk") \ + EM(smb_message_trace_alloc_query_directory, "AL Query-Dir ") \ + EM(smb_message_trace_alloc_query_info, "AL Query-Info") \ + EM(smb_message_trace_alloc_read, "AL Read ") \ + EM(smb_message_trace_alloc_session_setup, "AL Sess-setup") \ + EM(smb_message_trace_alloc_set_info, "AL Set-Info ") \ + EM(smb_message_trace_alloc_srv_to_cln_notif, "AL s2c-Notify") \ + EM(smb_message_trace_alloc_tree_connect, "AL Tree-conn ") \ + EM(smb_message_trace_alloc_tree_disconnect, "AL Tree-disc ") \ + EM(smb_message_trace_alloc_write, "AL Write ") \ + EM(smb_message_trace_free, "FREE ") \ + EM(smb_message_trace_get_call_async, "GET call-asyn") \ + EM(smb_message_trace_get_enqueue_sync, "GET enq-sync ") \ + EM(smb_message_trace_put_abort_conn, "PUT abrt-conn") \ + EM(smb_message_trace_put_clean_demux, "PUT cln-demux") \ + EM(smb_message_trace_put_decrypt_offload, "PUT decrypt-o") \ + EM(smb_message_trace_put_demux, "PUT demux ") \ + EM(smb_message_trace_put_demux_cb, "PUT demux-cb ") \ + EM(smb_message_trace_put_discard_message, "PUT disc-msg ") \ + EM(smb_message_trace_put_is_smb_resp, "PUT is-s-resp") \ + EM(smb_message_trace_put_messages, "PUT messages ") \ + EM(smb_message_trace_see_abort_conn, "SEE abrt-conn") \ + EM(smb_message_trace_see_clean_demux, "SEE cln-demux") \ + EM(smb_message_trace_see_dequeue_mid, "SEE deque-mid") \ + EM(smb_message_trace_see_find_mid, "SEE find-mid ") \ + EM(smb_message_trace_see_is_smb_resp, "SEE is-s-resp") \ + E_(smb_message_trace_see_wake_up_task, "SEE wake-task") + #define smb3_rw_credits_traces \ EM(cifs_trace_rw_credits_call_readv_adjust, "rd-call-adj") \ EM(cifs_trace_rw_credits_call_writev_adjust, "wr-call-adj") \ @@ -79,6 +118,7 @@ #define EM(a, b) a, #define E_(a, b) a =20 +enum smb_message_trace { smb_message_traces } __mode(byte); enum smb3_rw_credits_trace { smb3_rw_credits_traces } __mode(byte); enum smb3_tcon_ref_trace { smb3_tcon_ref_traces } __mode(byte); =20 @@ -92,6 +132,7 @@ enum smb3_tcon_ref_trace { smb3_tcon_ref_traces } __mode= (byte); #define EM(a, b) TRACE_DEFINE_ENUM(a); #define E_(a, b) TRACE_DEFINE_ENUM(a); =20 +smb_message_traces; smb3_rw_credits_traces; smb3_tcon_ref_traces; =20 @@ -1573,6 +1614,26 @@ TRACE_EVENT(smb3_rw_credits, __entry->server_credits, __entry->in_flight) ); =20 +TRACE_EVENT(smb3_message, + TP_PROTO(unsigned int smb_message_debug_id, int ref, + enum smb_message_trace trace), + TP_ARGS(smb_message_debug_id, ref, trace), + TP_STRUCT__entry( + __field(unsigned int, smb_message) + __field(int, ref) + __field(enum smb_message_trace, trace) + ), + TP_fast_assign( + __entry->smb_message =3D smb_message_debug_id; + __entry->ref =3D ref; + __entry->trace =3D trace; + ), + TP_printk("SMB=3D%08x %s r=3D%d", + __entry->smb_message, + __print_symbolic(__entry->trace, smb_message_traces), + __entry->ref) + ); + =20 #undef EM #undef E_ diff --git a/fs/smb/client/transport.c b/fs/smb/client/transport.c index 7a4788b54a07..2ccfdd6b958b 100644 --- a/fs/smb/client/transport.c +++ b/fs/smb/client/transport.c @@ -34,12 +34,14 @@ =20 struct smb_message *smb_message_alloc(enum smb2_command cmd, gfp_t gfp) { + static atomic_t debug_ids; struct smb_message *smb; =20 smb =3D mempool_alloc(&smb_message_pool, gfp); if (smb) { memset(smb, 0, sizeof(*smb)); refcount_set(&smb->ref, 1); + smb->debug_id =3D atomic_inc_return(&debug_ids); smb->command_id =3D cmd; smb->when_alloc =3D jiffies; smb->pid =3D current->pid; @@ -52,22 +54,47 @@ struct smb_message *smb_message_alloc(enum smb2_command= cmd, gfp_t gfp) smb->mid_state =3D MID_REQUEST_ALLOCATED; =20 init_waitqueue_head(&smb->waitq); + trace_smb3_message(smb->debug_id, 1, (enum smb_message_trace)cmd); } return smb; } =20 -void smb_get_message(struct smb_message *smb) +void smb_see_message(struct smb_message *smb, enum smb_message_trace trace) { - refcount_inc(&smb->ref); + trace_smb3_message(smb->debug_id, refcount_read(&smb->ref), trace); +} + +void smb_get_message(struct smb_message *smb, enum smb_message_trace trace) +{ + int r; + + __refcount_inc(&smb->ref, &r); + trace_smb3_message(smb->debug_id, r + 1, trace); + printk("GET SMB=3D%08x{%d} %pSR\n", + smb->debug_id, r + 1, __builtin_return_address(0)); +} + +static void smb_free_message(struct smb_message *smb) +{ + trace_smb3_message(smb->debug_id, refcount_read(&smb->ref), + smb_message_trace_free); + mempool_free(smb, &smb_message_pool); } =20 /* * Drop a ref on a message. This does not touch the chained messages. */ -void smb_put_message(struct smb_message *smb) +void smb_put_message(struct smb_message *smb, enum smb_message_trace trace) { - if (refcount_dec_and_test(&smb->ref)) - mempool_free(smb, &smb_message_pool); + unsigned int debug_id =3D smb->debug_id; + bool dead; + int r; + + dead =3D __refcount_dec_and_test(&smb->ref, &r); + trace_smb3_message(debug_id, r - 1, trace); + printk("PUT SMB=3D%08x{%d} %pSR\n", debug_id, r - 1, __builtin_return_add= ress(0)); + if (dead) + smb_free_message(smb); } =20 /* @@ -79,8 +106,17 @@ void smb_put_messages(struct smb_message *smb) struct smb_message *next; =20 for (; smb; smb =3D next) { + unsigned int debug_id =3D smb->debug_id; + bool dead; + int r; + next =3D smb->next; - smb_put_message(smb); + dead =3D __refcount_dec_and_test(&smb->ref, &r); + trace_smb3_message(debug_id, r - 1, smb_message_trace_put_messages); + printk("PUTS SMB=3D%08x{%d} %pSR\n", + debug_id, r - 1, __builtin_return_address(0)); + if (dead) + smb_free_message(smb); } } =20 @@ -89,6 +125,7 @@ cifs_wake_up_task(struct TCP_Server_Info *server, struct= smb_message *smb) { if (smb->mid_state =3D=3D MID_RESPONSE_RECEIVED) smb->mid_state =3D MID_RESPONSE_READY; + smb_see_message(smb, smb_message_trace_see_wake_up_task); wake_up_all(&smb->waitq); } =20 @@ -189,7 +226,7 @@ static void smb_discard_messages(struct TCP_Server_Info= *server, struct smb_mess for (smb =3D head_smb; smb; smb =3D next) { next =3D smb->next; if (discard_message(server, smb)) - smb_put_message(smb); + smb_put_message(smb, smb_message_trace_put_discard_message); } } =20 @@ -877,7 +914,7 @@ cifs_call_async(struct TCP_Server_Info *server, struct = smb_message *smb, smb->mid_state =3D MID_REQUEST_SUBMITTED; =20 /* put it on the pending_mid_q */ - smb_get_message(smb); + smb_get_message(smb, smb_message_trace_get_call_async); spin_lock(&server->mid_lock); list_add_tail(&smb->qhead, &server->pending_mid_q); spin_unlock(&server->mid_lock); @@ -893,7 +930,7 @@ cifs_call_async(struct TCP_Server_Info *server, struct = smb_message *smb, revert_current_mid(server, smb->credits_consumed); server->sequence_number -=3D 2; if (discard_message(server, smb)) - smb_put_message(smb); + smb_put_message(smb, smb_message_trace_put_discard_message); } =20 cifs_server_unlock(server); @@ -1295,7 +1332,7 @@ compound_send_recv(const unsigned int xid, struct cif= s_ses *ses, rc =3D smb_send_recv_messages(xid, ses, server, head_smb, flags); =20 error: - smb_put_messages(smb); + smb_put_messages(head_smb); return rc; }