[linux-cifs-client] lookup create with O_EXCL patch merged
Wilhelm Meier
wilhelm.meier at fh-kl.de
Thu Jul 9 20:13:51 GMT 2009
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 <jlayton at redhat.com>
> Tested-by: Shirish Pargaonkar <shirishp at gmail.com>
> CC: Stable Kernel <stable at kernel.org>
> ---
>
> 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
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