Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1672761

Re: [PATCH 28/32] quota: add get_inode_usage callback to transfer multi-inode charges

Show all headers | View raw

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@google.com>
> Acked-by: Jan Kara <jack@suse.cz>

Thanks, applied.

					- Ted

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

[PATCH 28/32] quota: add get_inode_usage callback to transfer multi-inode charges Tahsin Erdogan <tahsin@google.com> - 2017-06-22 04:00 +0200
  Re: [PATCH 28/32] quota: add get_inode_usage callback to transfer  multi-inode charges Theodore Ts'o <tytso@mit.edu> - 2017-06-22 17:50 +0200

csiph-web