Re: lookup create with O_EXCL patch merged

Am Mittwoch, 8. Juli 2009 23:58:27 schrieb Steve French:
> Now that it has been tested by Shirish, merged Jeff's patch into
> cifs-2.6.git
>
> cifs: fix regression with O_EXCL creates and optimize away lookup

ok, works perfectly for me (tested together with samba-3.3.6)!

Thanks,

Wilhelm

>
> Signed-off-by: Jeff Layton <[email protected]>
> Tested-by: Shirish Pargaonkar <[email protected]>
> CC: Stable Kernel <[email protected]>
> ---
>
> diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
> index a40054f..ff55fc6 100644
> --- a/fs/cifs/dir.c
> +++ b/fs/cifs/dir.c
> @@ -643,6 +643,15 @@ cifs_lookup(struct inode *parent_dir_inode,
> struct dentry *direntry,
>  			}
>  	}
>
> +	/*
> +	 * O_EXCL: optimize away the lookup, but don't hash the dentry. Let
> +	 * the VFS handle the create.
> +	 */
> +	if (nd->flags & LOOKUP_EXCL) {
> +		d_instantiate(direntry, NULL);
> +		return 0;
> +	}
> +
>  	/* can not grab the rename sem here since it would
>  	deadlock in the cases (beginning of sys_rename itself)
>  	in which we already have the sb rename sem */

-- 
Wilhelm