Messages in this thread | | | Date | Wed, 23 Sep 2015 07:45:07 +1000 | From | Dave Chinner <> | Subject | Re: [RFC PATCH 1/2] VFS: Kill use of O_LARGEFILE inside the kernel |
| |
On Tue, Sep 22, 2015 at 05:12:42PM +0100, David Howells wrote: > Theodore Ts'o <tytso@mit.edu> 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@fromorbit.com
| |