diff options
| -rw-r--r-- | mm/filemap.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 340c693112a9..062c25b184a5 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -3307,21 +3307,28 @@ retry_find: VM_BUG_ON_FOLIO(!folio_contains(folio, index), folio); /* - * We have a locked page in the page cache, now we need to check - * that it's up-to-date. If not, it is going to be due to an error. + * We have a locked folio in the page cache, now we need to check + * that it's up-to-date. If not, it is going to be due to an error, + * or because readahead was otherwise unable to retrieve it. */ if (unlikely(!folio_test_uptodate(folio))) { /* - * The page was in cache and uptodate and now it is not. - * Strange but possible since we didn't hold the page lock all - * the time. Let's drop everything get the invalidate lock and - * try again. + * If the invalidate lock is not held, the folio was in cache + * and uptodate and now it is not. Strange but possible since we + * didn't hold the page lock all the time. Let's drop + * everything, get the invalidate lock and try again. */ if (!mapping_locked) { folio_unlock(folio); folio_put(folio); goto retry_find; } + + /* + * OK, the folio is really not uptodate. This can be because the + * VMA has the VM_RAND_READ flag set, or because an error + * arose. Let's read it in directly. + */ goto page_not_uptodate; } |