Matthew Wilcox wrote:
On Wed, Dec 06, 2006 at 09:53:39AM -0600, Rob Ross wrote:
David Chinner wrote:
Does anyone here know about the XFS libhandle API? This has been
around for years and it does _exactly_ what these proposed syscalls
are supposed to do (and more).
Thanks for pointing these out Dave. These are indeed along the same
lines as the openg()/openfh() approach.
One difference is that they appear to perform permission checking on the
open_by_handle(), which means that the entire path needs to be encoded
in the handle, and makes it difficult to eliminate the path traversal
overhead on N open_by_handle() operations.
Another (and highly important) difference is that usage is restricted to
root:
xfs_open_by_handle(...)
...
if (!capable(CAP_SYS_ADMIN))
return -XFS_ERROR(EPERM);
I assume that this is because the implementation chose not to do the
path encoding in the handle? Because if they did, they could do full
path permission checking as part of the open_by_handle.
Rob
-
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
