[linux-cifs-client] [PATCH] cifs: add comments explaining cifs_new_fileinfo behavior

[Shirish Pargaonkar]

On Mon, May 10, 2010 at 9:30 AM, Suresh Jayaraman <sjayaraman at suse.de> wrote:
> The comments make it clear the otherwise subtle behavior of cifs_new_fileinfo().
>
> Signed-off-by: Suresh Jayaraman <sjayaraman at suse.de>
> --
>  fs/cifs/dir.c |   18 ++++++++++++++++--
>  1 files changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
> index d791d07..bd363df 100644
> --- a/fs/cifs/dir.c
> +++ b/fs/cifs/dir.c
> @@ -129,6 +129,12 @@ cifs_bp_rename_retry:
>        return full_path;
>  }
>
> +/*
> + * When called with struct file pointer set to NULL, there is no way we could
> + * update file->private_data, but getting it stuck on openFileList provides a
> + * way to access it from cifs_fill_filedata and thereby set file->private_data
> + * from cifs_open.
> + */
>  struct cifsFileInfo *
>  cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle,
>                  struct file *file, struct vfsmount *mnt, unsigned int oflags)
> @@ -251,6 +257,10 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
>                cifs_fattr_to_inode(*pinode, &fattr);
>        }
>
> +       /*
> +        * cifs_fill_filedata() takes care of setting cifsFileInfo pointer to
> +        * file->private_data.
> +        */
>        if (mnt)
>                cifs_new_fileinfo(*pinode, *pnetfid, NULL, mnt, oflags);
>
> @@ -466,8 +476,12 @@ cifs_create_set_dentry:
>                /* mknod case - do not leave file open */
>                CIFSSMBClose(xid, tcon, fileHandle);
>        } else if (!(posix_create) && (newinode)) {
> -                       cifs_new_fileinfo(newinode, fileHandle, NULL,
> -                                               nd->path.mnt, oflags);
> +               /*
> +                * cifs_fill_filedata() takes care of setting cifsFileInfo
> +                * pointer to file->private_data.
> +                */
> +               cifs_new_fileinfo(newinode, fileHandle, NULL, nd->path.mnt,
> +                                 oflags);
>        }
>  cifs_create_out:
>        kfree(buf);
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>

Acked-by: Shirish S. Pargaonkar <shirishpargaonkar at gmail.com>