Re: Extensible storage manager API - SMGR hook Redux

Found these warnings while compiling while only 0001 is applied.

[1166/2337] Compiling C object src/backend/postgres_lib.a.p/storage_smgr_md.c.o
../src/backend/storage/smgr/md.c: In function ‘mdexists’:
../src/backend/storage/smgr/md.c:224:28: warning: passing argument 1 of ‘mdopenfork’ from incompatible pointer type [-Wincompatible-pointer-types]
  224 |         return (mdopenfork(reln, forknum, EXTENSION_RETURN_NULL) != NULL);
      |                            ^~~~
      |                            |
      |                            SMgrRelation {aka SMgrRelationData *}
../src/backend/storage/smgr/md.c:167:43: note: expected ‘MdSMgrRelation’ {aka ‘MdSMgrRelationData *’} but argument is of type ‘SMgrRelation’ {aka ‘SMgrRelationData *’}
  167 | static MdfdVec *mdopenfork(MdSMgrRelation reln, ForkNumber forknum, int behavior);
      |                            ~~~~~~~~~~~~~~~^~~~
../src/backend/storage/smgr/md.c: In function ‘mdcreate’:
../src/backend/storage/smgr/md.c:287:40: warning: passing argument 1 of ‘register_dirty_segment’ from incompatible pointer type [-Wincompatible-pointer-types]
  287 |                 register_dirty_segment(reln, forknum, mdfd);
      |                                        ^~~~
      |                                        |
      |                                        SMgrRelation {aka SMgrRelationData *}
../src/backend/storage/smgr/md.c:168:51: note: expected ‘MdSMgrRelation’ {aka ‘MdSMgrRelationData *’} but argument is of type ‘SMgrRelation’ {aka ‘SMgrRelationData *’}
  168 | static void register_dirty_segment(MdSMgrRelation reln, ForkNumber forknum,

Here is a diff to be applied to 0001 which fixes the warnings that get 
generated when compiling. I did see that one of the warnings gets fixed 
0002 (the mdexists() one). I am assuming that change was just missed 
while rebasing the patchset or something. I did not see a fix for
mdcreate() in 0002 however.

-- 
Tristan Partin
Neon (https://neon.tech)