Hello list, I'm prototyping something like reflinks in xfs and was wondering if anyone could give me some pointers on the best way to duplicate the blocks of the shared inode at the reflink inode, the copy which must occur when breaking the link. It would be nice to do the transfer via the page cache after allocating the space at the desintation inode, but it doesn't seem like I can use any of the kernel helpers for copying the data via the address_space structs since I don't have a struct file on hand for the copy source. I'm doing this in xfs_file_open() so the only struct file I have is the file being opened for writing - the destination of the copy. What I do have on hand is the shared inode and the destination inode opened and ready to go, and the struct file for the destination. My prototype already mostly works just using xfs_alloc_file_space() to allocate the appropriate space in the destination inode, but I need to get that allocated space populated from the shared inode's extents. Any pointers appreciated, thanks! Regards, Vito Caputo P.S. I've seen Dave Chinner's mention of reflink prototypes in XFS on lwn but haven't been able to find any code, what's the status of that? _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
