[Yaffs] write operation returns incorrect value in case device is out of space

[Todd Poynor]

Mikhail Ryleev wrote:

> It also fixes a problem with partially written data that actually should 
> return the amount of data written.

May be OK, most callers will simply treat as an error, but various other 
commit_write implementations don't do this.  What code expects a partial 
count return?

> 2. device is out of space while creating new object. In this case 
> current code returns ENOMEM error code which is also misleading. 
> Unfortunatly, I do not see a simple fix here,  the structure of code is 
> such that it is hard to diffirenciate out-of-memory vs. out-of-space 
> situation here but I think ENOSPC would be better here because it is 
> more likely to happen.
>  
>...
> @@ -785,7 +784,7 @@
>   }
>   yaffs_GrossUnlock(dev);
>  
> - return nWritten != n ? -ENOSPC : nWritten;
> +   return ( nWritten == n || nWritten > 0 ) ? nWritten : -ENOSPC;

Can't match the code change to the description above, how was ENOMEM 
returned before?

Is a check for nWritten < 0 (-ENOMEM) appropriate?  Or else ( nWritten 
== n || nWritten > 0 ) can simply be nWritten > 0 .

-- 
Todd