On Fri, 16 Feb 2007 10:56:55 +0300 Alex Tomas <alex@xxxxxxxxxxxxx> wrote: > >>>>> Andrew Morton (AM) writes: > > AM> Well, one could just assume that the page has no disk mapping and go and > AM> make the space reservation. Things will work out OK when we come to do > AM> writepage(). > > AM> Or one could do both: call get_block() only if the page was inside i_size. > > well, even so we need to reserve not that block ony, but > also needed metadata (for the worst case). Right. Reserve all the blocks for the page and all the metadata for a page at that file offset. Worst case. > probably this > is work for get_block or some different method? umm, when I did this I think I added a new ->reservepage address_space op and called that from within the VFS's delalloc_prepare_write(). > anyway, > we have to call it if the page is being written partial. Not necessarily. If we're operating in nobh mode that page is brought uptodate in prepare_write(). - 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
