Re: [PATCH 2/3] xfsrestore: stobj_unpack_sessinfo cleanup

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On 29/09/2022 09:12, Donald Douwsma wrote:


On 29/09/2022 01:23, Darrick J. Wong wrote:
On Wed, Sep 28, 2022 at 03:53:06PM +1000, Donald Douwsma wrote:
stobj_unpack_sessinfo should be the reverse of stobj_pack_sessinfo, make
this clearer with respect to the session header and streams processing.

signed-off-by: Donald Douwsma <ddouwsma@xxxxxxxxxx>
---
  inventory/inv_stobj.c | 13 +++++++------
  1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/inventory/inv_stobj.c b/inventory/inv_stobj.c
index 5075ee4..521acff 100644
--- a/inventory/inv_stobj.c
+++ b/inventory/inv_stobj.c
@@ -1065,25 +1065,26 @@ stobj_unpack_sessinfo(
          return BOOL_FALSE;
      }
+    /* get the seshdr and then, the remainder of the session */
      xlate_invt_seshdr((invt_seshdr_t *)p, (invt_seshdr_t *)tmpbuf, 1);
      bcopy(tmpbuf, p, sizeof(invt_seshdr_t));
-
-    /* get the seshdr and then, the remainder of the session */
      s->seshdr = (invt_seshdr_t *)p;
      s->seshdr->sh_sess_off = -1;
      p += sizeof(invt_seshdr_t);
-
      xlate_invt_session((invt_session_t *)p, (invt_session_t *)tmpbuf, 1);
      bcopy (tmpbuf, p, sizeof(invt_session_t));
      s->ses = (invt_session_t *)p;
      p += sizeof(invt_session_t);
      /* the array of all the streams belonging to this session */
-    xlate_invt_stream((invt_stream_t *)p, (invt_stream_t *)tmpbuf, 1);
-    bcopy(tmpbuf, p, sizeof(invt_stream_t));
      s->strms = (invt_stream_t *)p;
-    p += s->ses->s_cur_nstreams * sizeof(invt_stream_t);
+    for (i = 0; i < s->ses->s_cur_nstreams; i++) {
+        xlate_invt_stream((invt_stream_t *)p,

Nit: trailing whitespace                        here ^

nod


+                  (invt_stream_t *)tmpbuf, 1);
+        bcopy(tmpbuf, p, sizeof(invt_stream_t));
+        p += sizeof(invt_stream_t);

Ok, so we translate p into tmpbuf, then bcopy tmpbuf back to p.  That
part makes sense, but I am puzzled by what stobj_pack_sessinfo does:

    for (i = 0; i < ses->s_cur_nstreams; i++) {
        xlate_invt_stream(strms, (invt_stream_t *)sesbuf, 1);
        sesbuf += sizeof(invt_stream_t);
    }

Why isn't that callsite xlate_invt_stream(&strms[i], ...); ?

Thanks! Yes, that's wrong, like the existing code it only worked/works
because there's only ever one stream. From the manpage "The third level
is media stream (currently only one  stream is supported)". Will fix.

Or should I just drop this clean-up? I think what I'm saying is right,
but its a clean-up for a feature that cant be used. I doubt anyone is
going to add multiple stream support now, whatever that was intended
for.




--D

+    }
      /* all the media files */
      s->mfiles = (invt_mediafile_t *)p;
--
2.31.1






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