On Wed, Feb 03, 2021 at 05:02:37PM +0100, Greg Kurz wrote:
> On Wed, 3 Feb 2021 10:28:50 -0500
> Vivek Goyal <vgo...@redhat.com> wrote:
>
> > On Wed, Feb 03, 2021 at 11:37:19AM +0000, Stefan Hajnoczi wrote:
> >
> > [..]
> > > @@ -1727,36 +1764,38 @@ static void lo_create(fuse_req_t req, fuse_ino_t
> > > parent, const char *name,
> > >
> > > update_open_flags(lo->writeback, lo->allow_direct_io, fi);
> > >
> > > - fd = openat(parent_inode->fd, name, (fi->flags | O_CREAT) &
> > > ~O_NOFOLLOW,
> > > - mode);
> > > + /* Try to create a new file but don't open existing files */
> > > + fd = openat(parent_inode->fd, name, fi->flags | O_CREAT | O_EXCL,
> > > mode);
> > > err = fd == -1 ? errno : 0;
> > > +
> > > lo_restore_cred(&old);
> > >
> > > - if (!err) {
> > > - ssize_t fh;
> > > -
> > > - pthread_mutex_lock(&lo->mutex);
> > > - fh = lo_add_fd_mapping(lo, fd);
> > > - pthread_mutex_unlock(&lo->mutex);
> > > - if (fh == -1) {
> > > - close(fd);
> > > - err = ENOMEM;
> > > - goto out;
> > > - }
> > > + /* Ignore the error if file exists and O_EXCL was not given */
> > > + if (err && !(err == EEXIST && !(fi->flags & O_EXCL))) {
> >
> > Can this check be simplified to.
> > if (err && (err == EEXIST && (fi->flags & O_EXCL)) {
>
> I guess you meant :
>
> if (err && (err != EEXIST || fi->flags & O_EXCL) {
This sounds correct. I forgot to take into account that if error is
not -EEXIST, we still want to bail out irrespective of O_EXCL.
Vivek
