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fix invalidate_inode_pages2_range() to not clear ret

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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>
This commit is contained in:
Hisashi Hifumi 2008-04-28 02:12:08 -07:00 committed by Linus Torvalds
parent ddc81ed2c5
commit 0dd1334faf
1 changed files with 8 additions and 3 deletions
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11
mm/truncate.c
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@ -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);