tree 9356d290dccd0afbb1b0e1f183c49bda843df052
parent 0eb8d47e69a2211a36643b180f1843ef45f6017d
author Tao Ma <tao.ma@oracle.com> 1219052326 +0800
committer Mark Fasheh <mfasheh@suse.com> 1223931479 -0700

ocfs2: Add the basic xattr disk layout in ocfs2_fs.h

Ocfs2 uses a very flexible structure for storing extended attributes on
disk. Small amount of attributes are stored directly in the inode block - up
to 256 bytes worth. If that fills up, attributes are also stored in an
external block, linked to from the inode block. That block can in turn
expand to a btree, capable of storing large numbers of attributes.

Individual attribute values are stored inline if they're small enough
(currently about 80 bytes, this can be changed though), and otherwise are
expanded to a btree. The theoretical limit to the size of an individual
attribute is about the same as an inode, though the kernel's upper bound on
the size of an attributes data is far smaller.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>