posix_create: make sure _fd that passed to posix_fdstat is valid

Make sure _fd that passed to posix_fdstat is always valid
even if posix_create_link_if_gfid_exists is called.

Signed-off-by: chenjinhao <[email protected]>

Author: chenjinhao

xlators/storage/posix/src/posix-entry-ops.c

@@ -2462,7 +2462,21 @@ posix_create(call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t flags,
                                                   loc->inode->table);
         if (!op_ret) {
             linked = _gf_true;
-            goto post_op;
+            /* A vaild _fd is required in posix_fdstat, which is after post_op label.
+             * So, we should open this existing linkfile anyway, instead goto post_op
+             * directly.
+             *
+             * goto post_op;
+             */
+
+            /* For an existing linkfile, we should clear unnecessary flags in _flags,
+             * otherwhile this file may be deleted and re-created once
+             * GF_FORCE_REPLACE_KEY is set and hence cause some xattr are absent.
+             */
+            if (_flags & O_CREAT)
+                _flags &= ~O_CREAT;
+            if (_flags & O_EXCL)
+                _flags &= ~O_EXCL;
         }
     }
 real_op: