Re: [patch 05/10] cifs: convert semaphore to mutex

Re: [patch 05/10] cifs: convert semaphore to mutex

[Steve French]

Christoph Hellwig <hch@infradead.org> wrote on 01/29/2010 04:29:05 PM:

> Christoph Hellwig <hch@infradead.org>
> 01/29/2010 04:29 PM
>
> To
>
> Thomas Gleixner <tglx@linutronix.de>
>
> cc
>
> LKML <linux-kernel@vger.kernel.org>, Christoph Hellwig
> <hch@infradead.org>, Peter Zijlstra <peterz@infradead.org>, Ingo
> Molnar <mingo@elte.hu>, Jeff Layton <jlayton@redhat.com>, Steven
> French/Austin/IBM@IBMUS
>
> Subject
>
> Re: [patch 05/10] cifs: convert semaphore to mutex
>
> On Fri, Jan 29, 2010 at 08:38:50PM -0000, Thomas Gleixner wrote:
> > pSesInfo->sesSem is used as mutex. Rename it to session_mutex and
> > convert it to a real mutex.
> >
> > Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> > Cc: Jeff Layton <jlayton@redhat.com>
> > Cc: Steve French <sfrench@us.ibm.com>
>
> Looks good, but I'm pretty sure I've seen an equivalent patch on the
> linux-cifs-client list before.
>
>
> Reviewed-by: Christoph Hellwig <hch@lst.de>

Jeff and I acked the cifs part of the patch series in July - not sure
why the series didn't go in.

http://marc.info/?l=linux-kernel&m=124859649902788&w=2 looks like the
original post

-- 
Thanks,

Steve

Re: [patch 05/10] cifs: convert semaphore to mutex

[Thomas Gleixner]

On Fri, 29 Jan 2010, Steve French wrote:
> > Looks good, but I'm pretty sure I've seen an equivalent patch on the
> > linux-cifs-client list before.
> >
> >
> > Reviewed-by: Christoph Hellwig <hch@lst.de>
> 
> Jeff and I acked the cifs part of the patch series in July - not sure
> why the series didn't go in.
> 
> http://marc.info/?l=linux-kernel&m=124859649902788&w=2 looks like the
> original post

Yeah, the patch was part of a larger series which had problems here
and there. I forgot to split it out and push it seperately.

Steve, can you pick that up and push it via the cifs tree ? It's
completely stand alone and does not depend on other patches.

Thanks,

	tglx

Re: [patch 05/10] cifs: convert semaphore to mutex

[Steve French]

On Sat, Jan 30, 2010 at 4:03 AM, Thomas Gleixner <tglx@linutronix.de> wrote:
> On Fri, 29 Jan 2010, Steve French wrote:
>> > Looks good, but I'm pretty sure I've seen an equivalent patch on the
>> > linux-cifs-client list before.
>> >
>> >
>> > Reviewed-by: Christoph Hellwig <hch@lst.de>
>>
>> Jeff and I acked the cifs part of the patch series in July - not sure
>> why the series didn't go in.
>>
>> http://marc.info/?l=linux-kernel&m=124859649902788&w=2 looks like the
>> original post
>
> Yeah, the patch was part of a larger series which had problems here
> and there. I forgot to split it out and push it seperately.
>
> Steve, can you pick that up and push it via the cifs tree ? It's
> completely stand alone and does not depend on other patches.

np - will queue for 2.6.34


-- 
Thanks,

Steve

[patch 00/10] semaphore to mutex conversions

[Thomas Gleixner]

The following series converts semaphores which are semantically
mutexes to real mutexes. This is part of the effort to remove
init_MUTEX*

Most of the patches have been in the -rt tree for quite a while with
no bad side effects.

Thanks,

	tglx

[patch 05/10] cifs: convert semaphore to mutex

[Thomas Gleixner]

[-- Attachment #1: cifs-convert-sema.patch --]
[-- Type: text/plain, Size: 4051 bytes --]

pSesInfo->sesSem is used as mutex. Rename it to session_mutex and
convert it to a real mutex.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Jeff Layton <jlayton@redhat.com>
Cc: Steve French <sfrench@us.ibm.com>
---
 fs/cifs/cifsglob.h |    2 +-
 fs/cifs/cifssmb.c  |   12 ++++++------
 fs/cifs/connect.c  |    8 ++++----
 fs/cifs/misc.c     |    2 +-
 4 files changed, 12 insertions(+), 12 deletions(-)

Index: linux-2.6-tip/fs/cifs/cifsglob.h
===================================================================
--- linux-2.6-tip.orig/fs/cifs/cifsglob.h
+++ linux-2.6-tip/fs/cifs/cifsglob.h
@@ -204,7 +204,7 @@ struct cifsUidInfo {
 struct cifsSesInfo {
 	struct list_head smb_ses_list;
 	struct list_head tcon_list;
-	struct semaphore sesSem;
+	struct mutex session_mutex;
 #if 0
 	struct cifsUidInfo *uidInfo;	/* pointer to user info */
 #endif
Index: linux-2.6-tip/fs/cifs/cifssmb.c
===================================================================
--- linux-2.6-tip.orig/fs/cifs/cifssmb.c
+++ linux-2.6-tip/fs/cifs/cifssmb.c
@@ -170,19 +170,19 @@ cifs_reconnect_tcon(struct cifsTconInfo 
 	 * need to prevent multiple threads trying to simultaneously
 	 * reconnect the same SMB session
 	 */
-	down(&ses->sesSem);
+	mutex_lock(&ses->session_mutex);
 	if (ses->need_reconnect)
 		rc = cifs_setup_session(0, ses, nls_codepage);
 
 	/* do we need to reconnect tcon? */
 	if (rc || !tcon->need_reconnect) {
-		up(&ses->sesSem);
+		mutex_unlock(&ses->session_mutex);
 		goto out;
 	}
 
 	mark_open_files_invalid(tcon);
 	rc = CIFSTCon(0, ses, tcon->treeName, tcon, nls_codepage);
-	up(&ses->sesSem);
+	mutex_unlock(&ses->session_mutex);
 	cFYI(1, ("reconnect tcon rc = %d", rc));
 
 	if (rc)
@@ -700,13 +700,13 @@ CIFSSMBLogoff(const int xid, struct cifs
 	if (!ses || !ses->server)
 		return -EIO;
 
-	down(&ses->sesSem);
+	mutex_lock(&ses->session_mutex);
 	if (ses->need_reconnect)
 		goto session_already_dead; /* no need to send SMBlogoff if uid
 					      already closed due to reconnect */
 	rc = small_smb_init(SMB_COM_LOGOFF_ANDX, 2, NULL, (void **)&pSMB);
 	if (rc) {
-		up(&ses->sesSem);
+		mutex_unlock(&ses->session_mutex);
 		return rc;
 	}
 
@@ -721,7 +721,7 @@ CIFSSMBLogoff(const int xid, struct cifs
 	pSMB->AndXCommand = 0xFF;
 	rc = SendReceiveNoRsp(xid, ses, (struct smb_hdr *) pSMB, 0);
 session_already_dead:
-	up(&ses->sesSem);
+	mutex_unlock(&ses->session_mutex);
 
 	/* if session dead then we do not need to do ulogoff,
 		since server closed smb session, no sense reporting
Index: linux-2.6-tip/fs/cifs/connect.c
===================================================================
--- linux-2.6-tip.orig/fs/cifs/connect.c
+++ linux-2.6-tip/fs/cifs/connect.c
@@ -2366,13 +2366,13 @@ try_mount_again:
 		 */
 		cifs_put_tcp_session(srvTcp);
 
-		down(&pSesInfo->sesSem);
+		mutex_lock(&pSesInfo->session_mutex);
 		if (pSesInfo->need_reconnect) {
 			cFYI(1, ("Session needs reconnect"));
 			rc = cifs_setup_session(xid, pSesInfo,
 						cifs_sb->local_nls);
 		}
-		up(&pSesInfo->sesSem);
+		mutex_unlock(&pSesInfo->session_mutex);
 	} else if (!rc) {
 		cFYI(1, ("Existing smb sess not found"));
 		pSesInfo = sesInfoAlloc();
@@ -2415,12 +2415,12 @@ try_mount_again:
 		}
 		pSesInfo->linux_uid = volume_info->linux_uid;
 		pSesInfo->overrideSecFlg = volume_info->secFlg;
-		down(&pSesInfo->sesSem);
+		mutex_lock(&pSesInfo->session_mutex);
 
 		/* BB FIXME need to pass vol->secFlgs BB */
 		rc = cifs_setup_session(xid, pSesInfo,
 					cifs_sb->local_nls);
-		up(&pSesInfo->sesSem);
+		mutex_unlock(&pSesInfo->session_mutex);
 	}
 
 	/* search for existing tcon to this server share */
Index: linux-2.6-tip/fs/cifs/misc.c
===================================================================
--- linux-2.6-tip.orig/fs/cifs/misc.c
+++ linux-2.6-tip/fs/cifs/misc.c
@@ -79,7 +79,7 @@ sesInfoAlloc(void)
 		++ret_buf->ses_count;
 		INIT_LIST_HEAD(&ret_buf->smb_ses_list);
 		INIT_LIST_HEAD(&ret_buf->tcon_list);
-		init_MUTEX(&ret_buf->sesSem);
+		mutex_init(&ret_buf->session_mutex);
 	}
 	return ret_buf;
 }

Re: [patch 05/10] cifs: convert semaphore to mutex

[Christoph Hellwig]

On Fri, Jan 29, 2010 at 08:38:50PM -0000, Thomas Gleixner wrote:
> pSesInfo->sesSem is used as mutex. Rename it to session_mutex and
> convert it to a real mutex.
> 
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: Jeff Layton <jlayton@redhat.com>
> Cc: Steve French <sfrench@us.ibm.com>

Looks good, but I'm pretty sure I've seen an equivalent patch on the
linux-cifs-client list before.


Reviewed-by: Christoph Hellwig <hch@lst.de>