>>>>> Nikita Danilov (ND) writes: >>> > In order to do the correct accounting, we need to mark a page >>> > to indicate if we reserved a block or not. One way to do this, >>> > to use page->private to indicate this. But then, all the generic >>> >>> I believe one can use PG_mappedtodisk bit in page->flags for this >>> purpose. There was old Andrew Morton's patch that introduced new bit >>> (PG_delalloc?) for this purpose. >> >> That would be good. But I don't feel like asking for a bit in page >> if there is a way to get around it.
ND> Clarification: PG_mappedtodisk is already here, it seems you can reuse ND> this already existing bit to implement delayed allocation support. I think we need another one, because mappedtodisk != reserved. we could use mappedtodisk, but this means in ->commit_write() we'd need to check that one more time (first time in ->prepare_write()) thanks, Alex - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
