util.pposix: Try posix_fallocate() if fallocate() is unsupported by the file system

diff --git a/util-src/pposix.c b/util-src/pposix.c
index 7dd8708b13ad866c79cd29cb462d8b6b17193f96..bda13ec020616dcb7b10231ab71d48fa6a9d3671 100644 (file)
--- a/util-src/pposix.c
+++ b/util-src/pposix.c
@@ -662,23 +662,34 @@ int lc_fallocate(lua_State* L)
        len = luaL_checkinteger(L, 3);
 
 #if defined(_GNU_SOURCE)
-       if(fallocate(fileno(f), FALLOC_FL_KEEP_SIZE, offset, len) != 0)
-#elif _XOPEN_SOURCE >= 600 || _POSIX_C_SOURCE >= 200112L
-#warning Using posix_fallocate() fallback. Linux fallocate() is strongly recommended if available: recompile with -D_GNU_SOURCE
-       if(posix_fallocate(fileno(f), offset, len) != 0)
+       if(fallocate(fileno(f), FALLOC_FL_KEEP_SIZE, offset, len) == 0)
+       {
+               lua_pushboolean(L, 1);
+               return 1;
+       }
+
+       if(errno != ENOSYS && errno != EOPNOTSUPP)
+       {
+               lua_pushnil(L);
+               lua_pushstring(L, strerror(errno));
+               return 2;
+       }
 #endif
+
+       if(posix_fallocate(fileno(f), offset, len) == 0)
        {
-#if ! defined(_GNU_SOURCE)
+               lua_pushboolean(L, 1);
+               return 1;
+       }
+       else
+       {
+               lua_pushnil(L);
+               lua_pushstring(L, strerror(errno));
                /* posix_fallocate() can leave a bunch of NULs at the end, so we cut that
                 * this assumes that offset == length of the file */
                ftruncate(fileno(f), offset);
-#endif
-               lua_pushnil(L);
-               lua_pushstring(L, strerror(errno));
                return 2;
        }
-       lua_pushboolean(L, 1);
-       return 1;
 }
 #endif