Jan Kara <jack@xxxxxxx> writes: >> Isn't it reallocated blocks too, and metadata too? > Reallocated blocks - not really. For a block to be freed it cannot be > under writeback and when it's freed no writeback is started. Sure for data -> data reallocated case. metadata -> data/metadata is still there. > For metadata - yes. But ext3, ext4, xfs, btrfs have to avoid modifying > metadata under writeback anyway (because of journalling / COW > constraints) and thus they don't care. Yes. Those would use better way than just blocking. > For ext2 or vfat it's a different story. But as I wrote to Darrick, > I'm not sure about vfat but for ext2 and similar legacy filesystems, > I'd rather let them live with their unstable pages under IO ;) because > I see a limited use for that. If this patches was not going to tackle it, I have no argument here ;) It would be simply FS specific approach/fixes anymore like journal. Thanks. -- OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx> -- 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
