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From: "Ananiev, Leonid I" <leonid.i.ananiev@intel.com>
To: "Ken Chen" <kenchen@google.com>, <suparna@in.ibm.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	<linux-kernel@vger.kernel.org>, "linux-aio" <linux-aio@kvack.org>,
	"Zach Brown" <zach.brown@oracle.com>,
	"Chris Mason" <chris.mason@oracle.com>,
	"Badari Pulavarty" <pbadari@us.ibm.com>
Subject: RE: [PATCH] aio: fix kernel bug when page is temporally busy
Date: Sat, 10 Feb 2007 22:36:29 +0300	[thread overview]
Message-ID: <B41635854730A14CA71C92B36EC22AAC804B00@mssmsx411> (raw)

> If invalidate_inode_pages2_range() says it can not invalidate pages,
> while dio to the same file offset range is in flight, something is
> really wrong there.

If invalidate_inode_pages2_range() says it can not invalidate pages
It means that soft_irq does completing IO now on other cpu.
Next retry() call in aio_run_iocb() will see the IO well completed.

The patch is updated: invalidate_inode_pages2() returns EIO as earlier
for
nfs and other.
But  invalidate_inode_pages2_range() returns EIOCBRETRY for aio and dio.

The patch against 2.6.20.

>From Leonid Ananiev

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

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);

             reply	other threads:[~2007-02-10 19:36 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-10 19:36 Ananiev, Leonid I [this message]
  -- strict thread matches above, loose matches on Subject: below --
2007-02-14 17:51 Ananiev, Leonid I
2007-02-15  3:30 ` Andrew Morton
2007-02-15  5:26   ` Ananiev, Leonid I
2007-02-09  4:29 Ananiev, Leonid I
2007-02-09  4:35 ` Andrew Morton
2007-02-09  5:41   ` Ananiev, Leonid I
2007-02-09  5:52     ` Andrew Morton
2007-02-12 22:52       ` Ananiev, Leonid I
2007-02-12 23:21       ` Ananiev, Leonid I
2007-02-09  7:16     ` Suparna Bhattacharya
2007-02-09  9:52       ` Ananiev, Leonid I
2007-02-09 10:11         ` Jiri Kosina
2007-02-10 18:05         ` Ken Chen
2007-02-10 18:17           ` Ananiev, Leonid I
2007-02-10 18:27           ` Ananiev, Leonid I
2007-02-10 21:57           ` Ananiev, Leonid I
2007-02-15  9:16           ` Ananiev, Leonid I
2007-02-15 18:25             ` Zach Brown
2007-02-15 19:11               ` Ananiev, Leonid I
2007-02-15 19:22                 ` Zach Brown
2007-02-15 21:06                   ` Ananiev, Leonid I
2007-02-15 23:32                   ` Ananiev, Leonid I
2007-02-16  0:01                     ` Zach Brown
2007-02-16 12:18                       ` Ananiev, Leonid I
2007-02-09  9:54 ` Jiri Kosina
2007-02-09 10:14   ` Andrew Morton
2007-02-09 10:40     ` Jiri Kosina
2007-02-09 11:05       ` Suparna Bhattacharya
2007-02-09 11:18         ` Ananiev, Leonid I
2007-02-09 17:02         ` Zach Brown

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