On Mon, Jul 18, 2016 at 12:13:38AM +0200, Adam Borowski wrote: > Instead of checking the mode of the file descriptor, let's check whether it > could have been opened rw. This allows fixing intermittent exec failures > when deduping a live system: anyone trying to exec a file currently being > deduped gets ETXTBSY. > > Issuing this ioctl on a ro file was already allowed for root/cap. > > Tested on btrfs and not-yet-merged xfs, as only them implement this ioctl. This is a resend of a patch I've targetted at the wrong maintainer (btrfs guys rather than Al Viro/vfs). Since then, I've tested it on xfs-devel (f0b34b677df10d9e3deffcd0b1c1aaaaf0234b80 atop of 4.7-rc5 and -rc7). Review so far: http://thread.gmane.org/gmane.comp.file-systems.btrfs/56563 An idea to relax the check and allow dedupe to everyone who can read the file was shot down because of concerns that in some edge cases it might be possible to clobber a targetted file. Thus, we're back to the original patch, requiring ro descriptor but rw permission. Meow! -- An imaginary friend squared is a real enemy. -- 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
