[PATCH] aio: fix kernel bug when page is temporally busy

["Ananiev, Leonid I" <leonid.i.ananiev@intel.com>]

-wrap lines are fixed. Sorry.

>From Leonid Ananiev

Fix kernel bug if IO page is temporally busy:
invalidate_inode_pages2_range() returns EIOCBRETRY but not  EIO.
invalidate_inode_pages2() returns EIO as earlier.

Signed-off-by: Leonid Ananiev <leonid.i.ananiev@intel.com>
---
--- linux-2.6.20/mm/truncate.c  2007-02-04 10:44:54.000000000 -0800
+++ linux-2.6.20p/mm/truncate.c 2007-02-08 22:56:52.000000000 -0800
@@ -366,7 +366,7 @@ static int do_launder_page(struct addres
  * Any pages which are found to be mapped into pagetables are unmapped prior to
  * invalidation.
  *This is path is modified so that invalidate_inode_pages2()
returns EIO as earlier.
Wrap lines are fixed

- From Leonid Ananiev

Fix kernel bug when IO page is temporally busy:
invalidate_inode_pages2_range() returns EIOCBRETRY but not  EIO.
invalidate_inode_pages2() returns EIO as earlier.

Signed-off-by: Leonid Ananiev <leonid.i.ananiev@intel.com>
---
--- linux-2.6.20/mm/truncate.c  2007-02-04 10:44:54.000000000 -0800
+++ linux-2.6.20p/mm/truncate.c 2007-02-08 22:56:52.000000000 -0800
@@ -366,7 +366,7 @@ static int do_launder_page(struct addres
  * Any pages which are found to be mapped into pagetables are unmapped prior to
  * invalidation.
  *
- * Returns -EIO if any pages could not be invalidated.
+ * Returns -EIOCBRETRY if any pages could not be invalidated.
  */
 int invalidate_inode_pages2_range(struct address_space *mapping,
                                  pgoff_t start, pgoff_t end)
@@ -423,7 +423,7 @@ int invalidate_inode_pages2_range(struct
                        }
                        ret = do_launder_page(mapping, page);
                        if (ret == 0 && !invalidate_complete_page2(mapping, page))
-                               ret = -EIO;
+                               ret = -EIOCBRETRY;
                        unlock_page(page);
                }
                pagevec_release(&pvec);
@@ -444,6 +444,7 @@ EXPORT_SYMBOL_GPL(invalidate_inode_pages
  */
 int invalidate_inode_pages2(struct address_space *mapping)
 {
-       return invalidate_inode_pages2_range(mapping, 0, -1);
+       int ret =  invalidate_inode_pages2_range(mapping, 0, -1);
+       return (ret < 0)?-EIO:ret;
 }
 EXPORT_SYMBOL_GPL(invalidate_inode_pages2);

- * Returns -EIO if any pages could not be invalidated.
+ * Returns -EIOCBRETRY if any pages could not be invalidated.
  */
 int invalidate_inode_pages2_range(struct address_space *mapping,
                                  pgoff_t start, pgoff_t end)
@@ -423,7 +423,7 @@ int invalidate_inode_pages2_range(struct
                        }
                        ret = do_launder_page(mapping, page);
                        if (ret == 0 && !invalidate_complete_page2(mapping, page))
-                               ret = -EIO;
+                               ret = -EIOCBRETRY;
                        unlock_page(page);
                }
                pagevec_release(&pvec);
@@ -444,6 +444,7 @@ EXPORT_SYMBOL_GPL(invalidate_inode_pages
  */
 int invalidate_inode_pages2(struct address_space *mapping)
 {
-       return invalidate_inode_pages2_range(mapping, 0, -1);
+       int ret =  invalidate_inode_pages2_range(mapping, 0, -1);
+       return (ret < 0)?-EIO:ret;
 }
 EXPORT_SYMBOL_GPL(invalidate_inode_pages2);