Commit 0dd1334f authored Apr 28, 2008 by Hisashi Hifumi Committed by Linus Torvalds Apr 28, 2008

fix invalidate_inode_pages2_range() to not clear ret



DIO invalidates page cache through invalidate_inode_pages2_range().
invalidate_inode_pages2_range() sets ret=-EIO when
invalidate_complete_page2() fails, but this ret is cleared if
do_launder_page() succeed on a page of next index.

In this case, dio is carried out even if invalidate_complete_page2() fails
on some pages.

This can cause inconsistency between memory and blocks on HDD because the
page cache still exists.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Ken Chen <kenchen@google.com>
Cc: Zach Brown <zach.brown@oracle.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Chuck Lever <cel@citi.umich.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent ddc81ed2

mm/truncate.c

+8 −3

Original line number	Diff line number	Diff line
		@@ -391,6 +391,7 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
		pgoff_t next;
		int i;
		int ret = 0;
		int ret2 = 0;
		int did_range_unmap = 0;
		int wrapped = 0;

		@@ -438,9 +439,13 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
		}
		}
		BUG_ON(page_mapped(page));
		ret = do_launder_page(mapping, page);
		if (ret == 0 && !invalidate_complete_page2(mapping, page))
		ret = -EIO;
		ret2 = do_launder_page(mapping, page);
		if (ret2 == 0) {
		if (!invalidate_complete_page2(mapping, page))
		ret2 = -EIO;
		}
		if (ret2 < 0)
		ret = ret2;
		unlock_page(page);
		}
		pagevec_release(&pvec);