On 2010-03-18, at 08:02, Dmitry Monakhov wrote:
* Disk layout
Project id is stored on disk inside xattr usually inside ibody.
Xattr is used only as a data storage, It has not user visible xattr
interface.
* User interface
Project id is accessible via generic xattr interface
"system.project_id"
+#define EXT4_XATTR_INDEX_PROJECT_ID 7
If you are making this attribute available to userspace via
system.project_id, doesn't it make sense to store it on disk as
system.project_id also (i.e. in the "system" namespace)?
Alternately, the "trusted" namespace is already intended for use as
"accessible only by root/kernel" semantics if this is what you are
trying to achieve.
I'm also with the statement "It has not user visible xattr interface"
yet you also write "Project id is accessible via generic xattr
interface". Why bother having this complexity when you are free to
make the two identical?
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
