On Tue, Sep 22, 2015 at 05:12:42PM +0100, David Howells wrote: > Theodore Ts'o <tytso@xxxxxxx> wrote: > > > So what this means is that on 32-bit systems, if we have a userspace > > program which isn't using the Largefile-enabled, and it opens a file > > which is larger than can be addressed with a 32-bit off_t, it can get > > surprised and possibly cause data loss. > > Good point. I was initially thinking that 32-bit userspace on a 64-bit system > would have O_LARGEFILE automatically enabled - but I guess it'll trap through > the compat entry points which avoid that. > > That said, fanotify and xfs_open_by_handle() will both automatically set > O_LARGEFILE irrespectively of the 32-bitness of the original caller. Any binaries that use xfs_open_by_handle() and then don't support greater than 32bit file offsets are simply broken. No ifs or buts - if you are using low level XFS specific file access ioctls, you need to build binaries that support 64 bit offsets. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- 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
