static int ovl_real_fdget_meta(const struct file *file, struct fd *real, bool allow_meta) { struct inode *inode = file_inode(file); struct inode *realinode; real->flags = 0; real->file = file->private_data; if (allow_meta) realinode = ovl_inode_real(inode); else realinode = ovl_inode_realdata(inode); /* Has it been copied up since we'd opened it? */ if (unlikely(file_inode(real->file) != realinode)) { real->flags = FDPUT_FPUT; real->file = ovl_open_realfile(file, realinode); return PTR_ERR_OR_ZERO(real->file); } /* Did the flags change since open? */ if (unlikely((file->f_flags ^ real->file->f_flags) & ~O_NOATIME)) return ovl_change_flags(real->file, file->f_flags); return 0; }
static int ovl_open(struct inode *inode, struct file *file) { struct file *realfile; int err; err = ovl_maybe_copy_up(file_dentry(file), file->f_flags); if (err) return err; /* No longer need these flags, so don't pass them on to underlying fs */ file->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC); realfile = ovl_open_realfile(file, ovl_inode_realdata(inode)); if (IS_ERR(realfile)) return PTR_ERR(realfile); file->private_data = realfile; return 0; }