On 2009-11-17, at 06:04, Pavel Emelyanov wrote:
We have a proposal to implement a 2-level disk quota on ext3 and ext4. In two words - the aim is to have directories on ext3/4 partitions which are limited by its disk usage and the number of inodes. Further the plan is to allow configuring uid and gid quotas within them. The main usage of this is containers. When two or more of them are located on one disk their roots will be marked with a unique tree id and thus the disk consumption of each container will be limited. While achieving this goal having an id of what tree an inode belongs to is a key requirement.
How do you handle files with multiple links, if they are located in different trees? The inode would need to have multiple tree ids.
You can instead just store this data in an xattr (which will normally be stored in the inode, so no performance impact), and then you are free to store multiple values per inode. Cheers, Andreas -- Andreas Dilger Sr. Staff Engineer, Lustre Group Sun Microsystems of Canada, Inc. -- 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
