Fix bug #149 (#148) whereby file_handle::zero() on Linux didn't

actually deallocate from the filing system the zeroed range of bytes.

include/llfio/revision.hpp

@@ -1,4 +1,4 @@
 // Note the second line of this file must ALWAYS be the git SHA, third line ALWAYS the git SHA update time
-#define LLFIO_PREVIOUS_COMMIT_REF    4872b85f61ca15454f852cc8f40092daa483ee5e
-#define LLFIO_PREVIOUS_COMMIT_DATE   "2024-11-06 09:04:25 +00:00"
-#define LLFIO_PREVIOUS_COMMIT_UNIQUE 4872b85f
+#define LLFIO_PREVIOUS_COMMIT_REF    931ad7b294ce852e577076630c445e2e930dae17
+#define LLFIO_PREVIOUS_COMMIT_DATE   "2024-11-18 14:44:33 +00:00"
+#define LLFIO_PREVIOUS_COMMIT_UNIQUE 931ad7b2

include/llfio/v2.0/detail/impl/posix/file_handle.ipp

@@ -991,13 +991,15 @@ result<file_handle::extent_type> file_handle::zero(file_handle::extent_pair exte
     return errc::value_too_large;
   }
 #if defined(__linux__)
-  if(-1 == fallocate(_v.fd, 0x02 /*FALLOC_FL_PUNCH_HOLE*/ | 0x01 /*FALLOC_FL_KEEP_SIZE*/, extent.offset, extent.length))
+  if(-1 != fallocate(_v.fd, 0x02 /*FALLOC_FL_PUNCH_HOLE*/ | 0x01 /*FALLOC_FL_KEEP_SIZE*/, extent.offset, extent.length))
   {
-    // The filing system may not support trim
-    if(EOPNOTSUPP != errno)
-    {
-      return posix_error();
-    }
+    // Success
+    return extent;
+  }
+  // The filing system may not support trim
+  if(EOPNOTSUPP != errno)
+  {
+    return posix_error();
   }
 #endif
   // Fall back onto a write of zeros