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cifs: multichannel: use pointer for binding channel 

Add a cifs_chan pointer in struct cifs_ses that points to the channel
currently being bound if ses->binding is true.

Previously it was always the channel past the established count.

This will make reconnecting (and rebinding) a channel easier later on.

Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Aurelien Aptel 2020-04-24 15:24:05 +02:00 committed by Steve French
parent edb1613536
commit 8eec79540d
2 changed files with 14 additions and 4 deletions
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15
fs/cifs/cifsglob.h
View File

@ -1030,6 +1030,7 @@ struct cifs_ses {
#define CIFS_MAX_CHANNELS 16
struct cifs_chan chans[CIFS_MAX_CHANNELS];
struct cifs_chan *binding_chan;
size_t chan_count;
size_t chan_max;
atomic_t chan_seq; /* round robin state */
@ -1037,23 +1038,31 @@ struct cifs_ses {
/*
* When binding a new channel, we need to access the channel which isn't fully
* established yet (one past the established count)
* established yet.
*/
static inline
struct cifs_chan *cifs_ses_binding_channel(struct cifs_ses *ses)
{
if (ses->binding)
return &ses->chans[ses->chan_count];
return ses->binding_chan;
else
return NULL;
}
/*
* Returns the server pointer of the session. When binding a new
* channel this returns the last channel which isn't fully established
* yet.
*
* This function should be use for negprot/sess.setup codepaths. For
* the other requests see cifs_pick_channel().
*/
static inline
struct TCP_Server_Info *cifs_ses_server(struct cifs_ses *ses)
{
if (ses->binding)
return ses->chans[ses->chan_count].server;
return ses->binding_chan->server;
else
return ses->server;
}

3
fs/cifs/sess.c
View File

@ -231,7 +231,7 @@ cifs_ses_add_channel(struct cifs_ses *ses, struct cifs_server_iface *iface)
mutex_lock(&ses->session_mutex);
chan = &ses->chans[ses->chan_count];
chan = ses->binding_chan = &ses->chans[ses->chan_count];
chan->server = cifs_get_tcp_session(&vol);
if (IS_ERR(chan->server)) {
rc = PTR_ERR(chan->server);
@ -276,6 +276,7 @@ cifs_ses_add_channel(struct cifs_ses *ses, struct cifs_server_iface *iface)
atomic_set(&ses->chan_seq, 0);
out:
ses->binding = false;
ses->binding_chan = NULL;
mutex_unlock(&ses->session_mutex);
if (rc && chan->server)