On Wed, Jun 21, 2017 at 06:49:35PM -0700, Tahsin Erdogan wrote: > Ext4 ea_inode feature allows storing xattr values in external inodes to > be able to store values that are bigger than a block in size. Ext4 also > has deduplication support for these type of inodes. With deduplication, > the actual storage waste is eliminated but the users of such inodes are > still charged full quota for the inodes as if there was no sharing > happening in the background. > > This design requires ext4 to manually charge the users because the > inodes are shared. > > An implication of this is that, if someone calls chown on a file that > has such references we need to transfer the quota for the file and xattr > inodes. Current dquot_transfer() function implicitly transfers one inode > charge. With ea_inode feature, we would like to transfer multiple inode > charges. > > Add get_inode_usage callback which can interrogate the total number of > inodes that were charged for a given inode. > > Signed-off-by: Tahsin Erdogan <tahsin@xxxxxxxxxx> > Acked-by: Jan Kara <jack@xxxxxxx> Thanks, applied. - Ted
