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cifs: fix credit accounting for extra channel

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commit a249cc8bc2e2fed680047d326eb9a50756724198 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aurelien Aptel 2021-03-04 17:42:21 +00:00 committed by Greg Kroah-Hartman
parent 83ff4f644d
commit 3370a84d78
2 changed files with 6 additions and 5 deletions
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10
fs/cifs/connect.c
View File

@ -2629,6 +2629,11 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
tcp_ses->min_offload = volume_info->min_offload;
tcp_ses->tcpStatus = CifsNeedNegotiate;
if ((volume_info->max_credits < 20) || (volume_info->max_credits > 60000))
tcp_ses->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
else
tcp_ses->max_credits = volume_info->max_credits;
tcp_ses->nr_targets = 1;
tcp_ses->ignore_signature = volume_info->ignore_signature;
/* thread spawned, put it on the list */
@ -4077,11 +4082,6 @@ static int mount_get_conns(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
*nserver = server;
if ((vol->max_credits < 20) || (vol->max_credits > 60000))
server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
else
server->max_credits = vol->max_credits;
/* get a reference to a SMB session */
ses = cifs_get_smb_ses(server, vol);
if (IS_ERR(ses)) {

1
fs/cifs/sess.c
View File

@ -224,6 +224,7 @@ cifs_ses_add_channel(struct cifs_ses *ses, struct cifs_server_iface *iface)
vol.noautotune = ses->server->noautotune;
vol.sockopt_tcp_nodelay = ses->server->tcp_nodelay;
vol.echo_interval = ses->server->echo_interval / HZ;
vol.max_credits = ses->server->max_credits;
/*
* This will be used for encoding/decoding user/domain/pw