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xfs: don't zero partial page cache pages during O_DIRECT writes 

Similar to direct IO reads, direct IO writes are using 
truncate_pagecache_range to invalidate the page cache. This is
incorrect due to the sub-block zeroing in the page cache that
truncate_pagecache_range() triggers.

This patch fixes things by using invalidate_inode_pages2_range
instead.  It preserves the page cache invalidation, but won't zero
any pages.

cc: stable@vger.kernel.org
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Dave Chinner 2014-09-02 12:12:52 +10:00 committed by Dave Chinner
parent 85e584da32
commit 834ffca6f7
1 changed files with 9 additions and 1 deletions
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10
fs/xfs/xfs_file.c
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@ -644,7 +644,15 @@ xfs_file_dio_aio_write(
pos, -1); pos, -1);
if (ret) if (ret)
goto out; goto out;
truncate_pagecache_range(VFS_I(ip), pos, -1); /*
* Invalidate whole pages. This can return an error if
* we fail to invalidate a page, but this should never
* happen on XFS. Warn if it does fail.
*/
ret = invalidate_inode_pages2_range(VFS_I(ip)->i_mapping,
pos >> PAGE_CACHE_SHIFT, -1);
WARN_ON_ONCE(ret);
ret = 0;
} }
/* /*