On Tue, Sep 22, 2009 at 11:03:25PM +1000, James Morris wrote: > On Tue, 22 Sep 2009, Christoph Hellwig wrote: > > > Note that the mapping should be really simple. Both the NFS protocol > > and XFS implement the same IRIX-xattr format that has a numerical > > namespace instead of the string prefix Linux has. If you just use the > > same mapping as XFS it should not have interoperability problems. > > One issue may be that the IRIX protcol for listxattr includes a > "attrlist_cursor_kern_t cursor" -- presumably to allow the client to index > into large lists of xattrs. I'm going to guess that this doesn't happen > much in practice, although to have interop with IRIX, we'd need to handle > this in some useful way. Yeah, unfortunately XFS experts those semantics via the horrible list attrs by handle ioctls and carries a lot of cruft around to allow using the cursor and validating the btree tate stored in it. It's a real mess. Personally I'd just kill it and do a similar indexing scheme that libattr uses to emulate the IRIX API (libattr/libattr.c:attr_list() in the libattr repository) -- 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
