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Diffstat (limited to 'mm/filemap.c')
-rw-r--r--mm/filemap.c29
1 files changed, 13 insertions, 16 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 61ba5e405791..ea89840fc65f 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -644,7 +644,9 @@ repeat:
pagep = radix_tree_lookup_slot(&mapping->page_tree, offset);
if (pagep) {
page = radix_tree_deref_slot(pagep);
- if (unlikely(!page || page == RADIX_TREE_RETRY))
+ if (unlikely(!page))
+ goto out;
+ if (radix_tree_deref_retry(page))
goto repeat;
if (!page_cache_get_speculative(page))
@@ -660,6 +662,7 @@ repeat:
goto repeat;
}
}
+out:
rcu_read_unlock();
return page;
@@ -777,12 +780,11 @@ repeat:
page = radix_tree_deref_slot((void **)pages[i]);
if (unlikely(!page))
continue;
- /*
- * this can only trigger if nr_found == 1, making livelock
- * a non issue.
- */
- if (unlikely(page == RADIX_TREE_RETRY))
+ if (radix_tree_deref_retry(page)) {
+ if (ret)
+ start = pages[ret-1]->index;
goto restart;
+ }
if (!page_cache_get_speculative(page))
goto repeat;
@@ -830,11 +832,7 @@ repeat:
page = radix_tree_deref_slot((void **)pages[i]);
if (unlikely(!page))
continue;
- /*
- * this can only trigger if nr_found == 1, making livelock
- * a non issue.
- */
- if (unlikely(page == RADIX_TREE_RETRY))
+ if (radix_tree_deref_retry(page))
goto restart;
if (page->mapping == NULL || page->index != index)
@@ -887,11 +885,7 @@ repeat:
page = radix_tree_deref_slot((void **)pages[i]);
if (unlikely(!page))
continue;
- /*
- * this can only trigger if nr_found == 1, making livelock
- * a non issue.
- */
- if (unlikely(page == RADIX_TREE_RETRY))
+ if (radix_tree_deref_retry(page))
goto restart;
if (!page_cache_get_speculative(page))
@@ -1029,6 +1023,9 @@ find_page:
goto page_not_up_to_date;
if (!trylock_page(page))
goto page_not_up_to_date;
+ /* Did it get truncated before we got the lock? */
+ if (!page->mapping)
+ goto page_not_up_to_date_locked;
if (!mapping->a_ops->is_partially_uptodate(page,
desc, offset))
goto page_not_up_to_date_locked;