From: Trond Myklebust <[email protected]>
invalidate_inode_pages2() should not try to fix races between direct_IO and
mmap(). It should only be trying to clear out pages that were dirty before
the direct_IO write (see generic_file_direct_IO()).
Skipping dirty pages should therefore not result in an error.
Signed-off-by: Trond Myklebust <[email protected]>
---
mm/truncate.c | 8 +++++---
1 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/mm/truncate.c b/mm/truncate.c
index 0f4b6d1..c3ff820 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -318,6 +318,8 @@ EXPORT_SYMBOL(invalidate_mapping_pages);
* invalidation guarantees, and cannot afford to leave pages behind because
* shrink_list() has a temp ref on them, or because they're transiently sitting
* in the lru_cache_add() pagevecs.
+ * Note: this function just skips pages that are dirty without flagging
+ * an error.
*/
static int
invalidate_complete_page2(struct address_space *mapping, struct page *page)
@@ -330,7 +332,7 @@ invalidate_complete_page2(struct address
write_lock_irq(&mapping->tree_lock);
if (PageDirty(page))
- goto failed;
+ goto dirty;
BUG_ON(PagePrivate(page));
__remove_from_page_cache(page);
@@ -338,9 +340,9 @@ invalidate_complete_page2(struct address
ClearPageUptodate(page);
page_cache_release(page); /* pagecache ref */
return 1;
-failed:
+dirty:
write_unlock_irq(&mapping->tree_lock);
- return 0;
+ return 1;
}
static int do_launder_page(struct address_space *mapping, struct page *page)
-
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