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Commit7d60e41

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Remove useless lstat() call in pg_rewind.
This is duplicative of an lstat that was just done by the callingfunction (traverse_datadir), besides which we weren't really doinganything with the results. There's not much point in checking tosee if someone removed the file since the previous lstat, since theFILE_ACTION_REMOVE code would have to deal with missing-file casesanyway. Moreover, the "exists = false" assignment was a dead store;nothing was done with that value later.A syscall saved is a syscall earned, so back-patch to 9.5where this code was introduced.Discussion:https://postgr.es/m/1221796.1599329320@sss.pgh.pa.us
1 parent546479f commit7d60e41

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‎src/bin/pg_rewind/filemap.c

Lines changed: 0 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -253,23 +253,11 @@ process_target_file(const char *path, file_type_t type, size_t oldsize,
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constchar*link_target)
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{
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boolexists;
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charlocalpath[MAXPGPATH];
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structstatstatbuf;
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file_entry_tkey;
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file_entry_t*key_ptr;
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filemap_t*map=filemap;
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file_entry_t*entry;
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snprintf(localpath,sizeof(localpath),"%s/%s",datadir_target,path);
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if (lstat(localpath,&statbuf)<0)
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{
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if (errno!=ENOENT)
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pg_fatal("could not stat file \"%s\": %s\n",
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localpath,strerror(errno));
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exists= false;
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}
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if (map->array==NULL)
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{
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/* on first call, initialize lookup array */

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