On Tue, Dec 20, 2011 at 09:33:06AM +0800, Liu Bo wrote:
> > +static long btrfs_ioctl_compr_size(struct file *file, void __user *argp)
> > +{
> > + struct inode *inode = fdentry(file)->d_inode;
> > + struct btrfs_ioctl_compr_size_args compr_args;
> > + u64 len;
> > + u64 compressed_size = 0;
> > + u64 offset = 0;
> > +
> > + if (S_ISDIR(inode->i_mode))
> > + return -EISDIR;
> > +
> > + if (copy_from_user(&compr_args, argp,
> > + sizeof(struct btrfs_ioctl_compr_size_args)))
> > + return -EFAULT;
> > +
> > + if (compr_args.start > compr_args.end)
> > + return -EINVAL;
> > +
> > + mutex_lock(&inode->i_mutex);
> > +
> > + offset = compr_args.start;
> > + if (inode->i_size > compr_args.end)
> > + len = compr_args.end;
> > + else
> > + len = inode->i_size;
> > +
> > + /*
> > + * do any pending delalloc/csum calc on inode, one way or
> > + * another, and lock file content
> > + */
> > + btrfs_wait_ordered_range(inode, compr_args.start, len);
> > +
>
> missing a lock_extent() ?
yeah right, thanks, it was missing even in the original implementation
and was left unnoticed.
> and we may adjust i_mutex and [un]lock_extent.
adjusted which way? I have swapped order of unlock_extent/mutex_unlock
as it was in the wrong order wrt locking. I'll send V2 in a minute.
thanks,
david
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