[PATCH] cifs: fix credit accounting for extra channel

[PATCH] cifs: fix credit accounting for extra channel

[Steve French]

[-- Attachment #1: Type: text/plain, Size: 2141 bytes --]

With multichannel, operations like the queries
from "ls -lR" can cause all credits to be used and
errors to be returned since max_credits was not
being set correctly on the secondary channels and
thus the client was requesting 0 credits incorrectly
in some cases (which can lead to not having
enough credits to perform any operation on that
channel).

Signed-off-by: Aurelien Aptel <aaptel@suse.com>
CC: <stable@vger.kernel.org> # v5.8+
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
---
 fs/cifs/connect.c | 10 +++++-----
 fs/cifs/sess.c    |  1 +
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 112692300fb6..68642e3d4270 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1429,6 +1429,11 @@ cifs_get_tcp_session(struct smb3_fs_context *ctx)
  tcp_ses->min_offload = ctx->min_offload;
  tcp_ses->tcpStatus = CifsNeedNegotiate;

+ if ((ctx->max_credits < 20) || (ctx->max_credits > 60000))
+ tcp_ses->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
+ else
+ tcp_ses->max_credits = ctx->max_credits;
+
  tcp_ses->nr_targets = 1;
  tcp_ses->ignore_signature = ctx->ignore_signature;
  /* thread spawned, put it on the list */
@@ -2832,11 +2837,6 @@ static int mount_get_conns(struct
smb3_fs_context *ctx, struct cifs_sb_info *cif

  *nserver = server;

- if ((ctx->max_credits < 20) || (ctx->max_credits > 60000))
- server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
- else
- server->max_credits = ctx->max_credits;
-
  /* get a reference to a SMB session */
  ses = cifs_get_smb_ses(server, ctx);
  if (IS_ERR(ses)) {
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index 183a3a868d7b..63d517b9f2ff 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -230,6 +230,7 @@ cifs_ses_add_channel(struct cifs_sb_info *cifs_sb,
struct cifs_ses *ses,
  ctx.noautotune = ses->server->noautotune;
  ctx.sockopt_tcp_nodelay = ses->server->tcp_nodelay;
  ctx.echo_interval = ses->server->echo_interval / HZ;
+ ctx.max_credits = ses->server->max_credits;

  /*
  * This will be used for encoding/decoding user/domain/pw

-- 
Thanks,

Steve

[-- Attachment #2: 0001-cifs-fix-credit-accounting-for-extra-channel.patch --]
[-- Type: text/x-patch, Size: 2353 bytes --]

From ab64d5565d303ef01d16dad29ecc6001715d27d2 Mon Sep 17 00:00:00 2001
From: Aurelien Aptel <aaptel@suse.com>
Date: Thu, 4 Mar 2021 17:42:21 +0000
Subject: [PATCH] cifs: fix credit accounting for extra channel

With multichannel, operations like the queries
from "ls -lR" can cause all credits to be used and
errors to be returned since max_credits was not
being set correctly on the secondary channels and
thus the client was requesting 0 credits incorrectly
in some cases (which can lead to not having
enough credits to perform any operation on that
channel).

Signed-off-by: Aurelien Aptel <aaptel@suse.com>
CC: <stable@vger.kernel.org> # v5.8+
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
---
 fs/cifs/connect.c | 10 +++++-----
 fs/cifs/sess.c    |  1 +
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 112692300fb6..68642e3d4270 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1429,6 +1429,11 @@ cifs_get_tcp_session(struct smb3_fs_context *ctx)
 	tcp_ses->min_offload = ctx->min_offload;
 	tcp_ses->tcpStatus = CifsNeedNegotiate;
 
+	if ((ctx->max_credits < 20) || (ctx->max_credits > 60000))
+		tcp_ses->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
+	else
+		tcp_ses->max_credits = ctx->max_credits;
+
 	tcp_ses->nr_targets = 1;
 	tcp_ses->ignore_signature = ctx->ignore_signature;
 	/* thread spawned, put it on the list */
@@ -2832,11 +2837,6 @@ static int mount_get_conns(struct smb3_fs_context *ctx, struct cifs_sb_info *cif
 
 	*nserver = server;
 
-	if ((ctx->max_credits < 20) || (ctx->max_credits > 60000))
-		server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
-	else
-		server->max_credits = ctx->max_credits;
-
 	/* get a reference to a SMB session */
 	ses = cifs_get_smb_ses(server, ctx);
 	if (IS_ERR(ses)) {
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index 183a3a868d7b..63d517b9f2ff 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -230,6 +230,7 @@ cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
 	ctx.noautotune = ses->server->noautotune;
 	ctx.sockopt_tcp_nodelay = ses->server->tcp_nodelay;
 	ctx.echo_interval = ses->server->echo_interval / HZ;
+	ctx.max_credits = ses->server->max_credits;
 
 	/*
 	 * This will be used for encoding/decoding user/domain/pw
-- 
2.27.0