linux-kernel - Re: [PATCH] cifs: fix fh_mutex locking in cifs_reopen

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Date:	Sat, 27 Jun 2009 19:10:14 -0500
From:	Steve French <smfrench@...il.com>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	linux-cifs-client@...ts.samba.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] cifs: fix fh_mutex locking in cifs_reopen_file

Good catch .

I have reviewed and merged into cifs-2.6.git. Merge requested for upstream.

On Sat, Jun 27, 2009 at 6:04 AM, Jeff Layton<jlayton@...hat.com> wrote:
> Fixes a regression caused by commit a6ce4932fbdbcd8f8e8c6df76812014351c32892
>
> When this lock was converted to a mutex, the locks were turned into
> unlocks and vice-versa.
>
> Signed-off-by: Jeff Layton <jlayton@...hat.com>
> Cc: Stable Tree <stable@...nel.org>
> ---
>  fs/cifs/file.c |   10 +++++-----
>  1 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/fs/cifs/file.c b/fs/cifs/file.c
> index ebdbe62..97ce4bf 100644
> --- a/fs/cifs/file.c
> +++ b/fs/cifs/file.c
> @@ -493,9 +493,9 @@ static int cifs_reopen_file(struct file *file, bool can_flush)
>                return -EBADF;
>
>        xid = GetXid();
> -       mutex_unlock(&pCifsFile->fh_mutex);
> +       mutex_lock(&pCifsFile->fh_mutex);
>        if (!pCifsFile->invalidHandle) {
> -               mutex_lock(&pCifsFile->fh_mutex);
> +               mutex_unlock(&pCifsFile->fh_mutex);
>                rc = 0;
>                FreeXid(xid);
>                return rc;
> @@ -527,7 +527,7 @@ static int cifs_reopen_file(struct file *file, bool can_flush)
>        if (full_path == NULL) {
>                rc = -ENOMEM;
>  reopen_error_exit:
> -               mutex_lock(&pCifsFile->fh_mutex);
> +               mutex_unlock(&pCifsFile->fh_mutex);
>                FreeXid(xid);
>                return rc;
>        }
> @@ -569,14 +569,14 @@ reopen_error_exit:
>                         cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
>                                CIFS_MOUNT_MAP_SPECIAL_CHR);
>        if (rc) {
> -               mutex_lock(&pCifsFile->fh_mutex);
> +               mutex_unlock(&pCifsFile->fh_mutex);
>                cFYI(1, ("cifs_open returned 0x%x", rc));
>                cFYI(1, ("oplock: %d", oplock));
>        } else {
>  reopen_success:
>                pCifsFile->netfid = netfid;
>                pCifsFile->invalidHandle = false;
> -               mutex_lock(&pCifsFile->fh_mutex);
> +               mutex_unlock(&pCifsFile->fh_mutex);
>                pCifsInode = CIFS_I(inode);
>                if (pCifsInode) {
>                        if (can_flush) {
> --
> 1.6.0.6
>
>



-- 
Thanks,

Steve
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