On Tue, Mar 07, 2017 at 06:39:42PM +0000, David Howells wrote: > Darrick J. Wong <darrick.wong@xxxxxxxxxx> wrote: > > > Is (flags & AT_EMPTY_PATH) is the same as (pathname == NULL)? > > I'm not sure. I was wondering about that whilst writing this. The text > describing the option is copied from the stat(2) manpage. It specified an > empty path (presumably "") rather than NULL. I'm also not sure whether it has > other ramifications. <nod> > > > .I Note: > > > For performance and simplicity reasons, different fields in the > > > .I statx > > > structure may contain state information from different moments > > > during the execution of the system call. > > > > Hm. Judging from the ext4 patch you proposed, I gather this is > > expected, at least in the btime case. Ugh, I put that in the wrong part -- this was supposed to be a comment about the part where the manpage states that filesystems can return more than userspace asked for. My eyes are bad at reading manpage source. :/ (Sorry for the noise.) --D > This is copied from the stat(2) manpage. The comment in the source there says > it's because there's no locking in the getattr path against the setattr path. > > David
