On Wed, May 11, 2011 at 12:24:58AM +0900, OGAWA Hirofumi wrote: > > under writeback and when it's freed no writeback is started. > > Sure for data -> data reallocated case. metadata -> data/metadata is > still there. That's usually handled differently. For XFS take a look at the xfs_alloc_busy_* function. For 2.6.40 they've been mostly rewritten to rarely wait for the reuse but instead avoid busy blocks. But that's a real data integrity issue even without stable pages for I/O. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
