diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/dax.c | 12 |
1 files changed, 6 insertions, 6 deletions
@@ -392,12 +392,12 @@ int dax_folio_reset_order(struct folio *folio) int order = folio_order(folio); /* - * DAX maintains the invariant that folio->share != 0 only when - * folio->mapping == NULL (enforced by dax_folio_make_shared()). - * Equivalently: folio->mapping != NULL implies folio->share == 0. - * Callers ensure share has been decremented to zero before - * calling here, so unconditionally clearing both fields is - * correct. + * Clear the mapping and the index/share union word. folio->share + * and folio->index occupy the same union in struct folio. For + * non-shared folios (mapping != NULL), the union holds folio->index + * (file page offset); for shared folios (mapping == NULL), it holds + * folio->share (reference count). Either way, we are releasing the + * folio and both fields should be zeroed. */ folio->mapping = NULL; folio->share = 0; |